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Oct. 22, 1946.
|_. v. LEWIS
2,409,696 7
REMOTE CONTROL SYSTEM m
Filed March 6, 1943
5 Sheets-Sheet l
Oct; 22; 1946.
2,409,696‘
L. V. LEWIS
REMOTE CONTROL SYSTEM
Filed March 6, 1943
s Sheets-Sheet 2
INVENTOR
&
HI!’ ATTORNEY
Oct. 22,1946.
L. v. LEWIS
‘ 2,409,696
‘REMOTE CONTROL SYS'ITEM
Filed March a, 194:5
5 ‘Sheets-Sheet. 3
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’
INVENTOR‘
[1090’ 1/. [ewz'r
Oct. 22, 1946.
v|_. v. LEWIS
2,409,696 ’
REMOTE CONTROL SYSTEM
Filed ‘March 6/1945
5 Sheets-Sheet 5
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Patented Oct. 22, 1946
2,409,696
VUNITED STATES PATENT OFFIC
2,409,696
‘
‘
REMOTE CONTROL SYSTEM
Lloyd V. Lewis, Pittsburgh, Pa., assignorto The
Union Switch & Signal Company, Swissvale,
Pa., a corporation of Pennsylvania
Application March 6, 1943, Serial No. 478,252
1
12 Claims.‘ (Cl. 177-353)
My invention relates to remote control systems,
and more particularly to centralized tra?‘ic ‘con
trol systems for railroads in which a central o?ice
is connected with a plurality of ?eld stations by
line wires over which code signals are trans~
mitted at times for controlling selected devices at
the stations, and at other times for indicating the
condition of station devices at the o?ice.
My invention is an improvement upon that dis
closed in my Letters Patent of the United States 10
No, 2,229,249, granted January 21, 1941, for Be
mote control systems.
One object of my invention is the provision
‘ of a remote control system which is particularly
adapted to the use of existing line Wires without
interfering with their joint use for telephone or
telegraph communication or for other purposes.
To this end the system of my invention employs
code signals of the alternating current type in
which each code comprises a series of impulses
of current of alternately opposite polarity and
the time spacing of successive impulses deter
mines the code character. One advantage of
this type of code is that the line signals may be
generated inductively and consequently no line 25
battery is needed.
2
the long steps of the code are registered and for
a system capacity of 35 stations seven steps of the
code are used. In the system herein disclosed,
boththe short and long code elements are regis
tered positively and the number of available
combinations is greatly increased, six steps for
example, being su?icient for the selection of 64
stations. In respect to this feature, my inven
tion is an improvement upon that shown in Let
ters Patent of the United States to Snavely et al.
No. 2,183,155, issued December 12, 1939, for Re
mote control systems.
Another feature of my invention relates to a‘
reduction in the number of relays required for
selecting purposes. The selection of the stations
_ is effected by the operation of a group of pilot re
lays, and generally requires but one such relay
for each selecting step of the code. The opera
tion ‘of the pilot relays is so checked as to permit I
their utilization in both the picked up and released
positions.
Another feature of my invention comprises the
provision of a pair of relays of the stick polar
type arranged to remain in their last operated
position when denergized, for registering the
short or long character of the code elements.
Another advantage is that signals of this type . These relays are operated alternately by the code
will pass readily through transformers or repeat
elements as received and serve to store their char
ing coils, permitting line circuits to be used which
acter for delivery to the proper storage relay
are not available for battery systems. My system, 30 while the next element in turn is being received.
however, does not require the insertion of any
Another object of my invention resides in pro
apparatus in series with the line, nor is a me
visions for allowing only one code to be stored at
tallic connection to the line Wires essential. Fur
the control oflice at a time, thereby insuring that
thermore, the apparatus at the oince and at the
a series of codes set up manually in a given order
several stations is connected to the line wires in 35 will be transmitted in the same order rather than
parallel and the operation of the system is inde
in an arbitrary order of code superiority. This
pendent of the relative location of the. office and
arrangement is of advantage, for example, in
the several stations, one advantage of which is
the operation of a series of track switches to set
that in the event of an interruption due to a
up a route and in eifecting the clearing of a sig
break in the line service may be quickly restored 40 nal governing traffic movements over the route as
by main o?ice switching, for example, by con
soon as it is fully set up and eliminates the need
for a route circuit network for governing the
order of transmission of the codes as required
A feature of my invention comprises the pro
heretofore. In accordance with this feature of
vision of interference preventing means which 45 my invention the character of the code to be
necting the line in parallel with a spare line at
its opposite ends.
.
serves when two or more codes are initiated at
the same time to effect their transmission sequen
tially in a given order, and also to stop the trans- I
mission of a code which is interfered with by im
pulses of foreign current. The interrupted code.
may then be reinitiated manually or automati
cally for retransmission in its entirety.
7 Another feature of my invention relates to the
more e?icient utilization of the code elements.
In the system of the prior patent mentioned, only.
transmitted is determined by the momentary
operation of a selected starting button without
the use of individual code ‘determining or start
ing relays vas generally used heretofore. The ap
paratus is also arranged that the latter may. be
used to store a plurality of codes for transmission
in a ?xed order without interference when desired.
The system of my invention employs a chain
of counting relays similar in number‘ and ar
rangement to those Of my prior patent, but in
2,409,696
3
eludes novel arrangements for governing the op
eration of these relays to render them responsive
only to a particular code, no other selecting re
lays being needed except when it is desired to have
them respond to more than one code.
Another feature of my invention resides in the
4
In the accompanying drawingsi
_
Figs. 1A and 1B taken together, show in con
densed form the apparatus at the control of?ce'
in a typical centralized traffic control system em
bodying my invention, Fig. 1A showing the office
coding unit and Fig. 1B the associated o?ice
storage apparatus.
connection of the stick polar relays for register
Figs. 2A and 2B, taken together, show the cor
ing code character, in series with the counting
responding apparatus at a typical ?eld location,
relays, whereby each counting relay together with
Fig. 2A showing a coding unit which is struc
the polar relay energized in series therewith func 10 turally similar to that at the o?ice but which has
tions like a polar-neutral relay in providing checks
different terminal connections, and Fig. 2B the
against improper operation. That is to say, those
storage apparatus at a station having only one
circuits which include polar contacts also include
unit group of devices to be controlled, each such
neutral front contacts the closing of which checks
being identi?ed as a station.
the energization of the polar relay in the normal 15 group
Fig. 2C illustrates a modi?cation which is to be
or reverse direction and thereby indicates that
substituted for Fig. 23 at each ?eld location
its contacts are in a proper position.
'
where the number of devices to be controlled ex
Another feature of my invention resides in im
ceeds the capacity of a single station or panel.
proved arrangements for controlling a transmit
Fig. 3 shows a modification of the office select
ter relay for generating the code, in which each 20 ing circuits which may be substituted for a por
‘operation of the relay depends upon the closing
tion of Fig. 113, to provide for the storage of con
of a different one of a series of successively pre
trol codes for transmission in a given order, as
hereinbefore referred to.
Another feature of my invention relates to the
Fig. 4 shows a pair of relays which may be sub
provision of improved means for preventing un 25 stituted for any one of the pilot relays P of the
due delay in the transmission of codes from the
other views to obtain the requisite contact ca
pared circuits.
different stations under conditions of heavy traf
?c, due to the fact that the stations normally
pacity when this exceeds the capacity of a single
relay.
Similar reference characters refer to similar
30
superiority.
parts in each of the several views.
IA leading object of my invention is the pro
Referring to Fig. 1A, the reference characters
' vision of a system of the desired scope in a form
Y and Z designate a pair of line wires which pro
which can be readily maintained to minimize
vide a line circuit for the centralized tra?ic con
service interruptions and which is readily adapt
trol system of my invention. It is to be under
able to widely different conditions. On the one 35 stood that these wires extend continuously the
hand, maintenance is facilitated by mounting the
length of the territory controlled by the central
relays in one or more unit housings with detach
ized traffic control system, and that they may be
able connections, while on the other hand, dif
used jointly for telephone and telegraph com
ferent conditions require a variety of units some
munication like the similarly designated line
40
of which may contain idle relays and may be more
wires shown in Letters Patent of the United
efficiently provided for by the use of separately
States to Baughman et al., No. 2,803,875, issued
mounted relays wired individually according to
December 1, 1942, for Remote control systems.
their location. To meet these diverse require
The system of my invention utilizes the line wires
ments those relays which are invariable, that is
to provide a channel for the transmission of low
to say, those the functioning of which is required
frequency alternating current of the order of
regardless of their location or of the scope of the
six cycles per second, and communication be
installation are mounted in a detachable coding
tween the o?ice and stations is effected by means
of codes each comprising a series of alternations
unit such as is provided in the system of my prior
patent, having detachable connections to which 50 or impulses of alternately opposite polarity hav
ing a low frequency of the order mentioned, with
those storage relays may be connected which vary
pauses interposed to provide code character.
according to the location. One improvement re
The C. T. 0. line channel in its normal idle con
sides in the arrangement of the coding unit so
dition comprises the line wires Y and Z in series,
that it may be used at the office or at any station,
only one spare unit being required for each instale 55 with a connection bridged across the line wires
through the coils l2 of a low pass ?lter and the
lation, while other improvements comprise ar
high resistance winding of a line relay R at the
rangements whereby the number of variable re
office, as shown in Fig. 1A, and also at each sta
lays has been decreased.
tion, as shown in Fig. 2A, the transmitting appa
A further feature of my invention resides in
the arrangement of the coding unit or that cer 60 ratus at the office and wat each station being
normally disconnected from the line. Each line
tain of the steps of the code may be used to pro
relay R is of the stick polar type, like relay OR
vide additional controls and indications in instal
of the above-mentioned Baughman et al. patent,
lations in which they are not required for station
and is arranged to hold its contacts magnetically
selection.
Certain features of the system of my invention 65 in their last-operated position when the line is
idle and also during the pauses between successive
disclosed but not claimed herein, are claimed in
impulses of a code, the contacts of each line relay
my divisional applications, Serial No. 549,276,
have access to the line in a ?xed order of code
. ?led August 12, 1944, for Transmitting apparatus I ‘R normally occupying their left-hand position,
for remote control systems, and Serial No. 549,
277, ?led August 12, 1944, for Selecting apparatus 70
> for remote control systems.
I shall describe one form of apparatus embody
ing my invention and various modi?cations there
~ of, and shall then point out its novel features in
'; claims.
as shown.
Each coding unit, such as the one shown in
Fig. 1A, includes transmitting apparatus gov
erned by its line relay R, consisting of a starting
relay ST, a master relay M, a transmitter relay
‘ T and an impulse transformer I3, this apparatus
75 functioning as follows: Relay M is picked up,
5
2,409,098
‘and is held energized to condition the'coding unit
for transmission, by momentarily energizing
relay ST. The closing of front contact a‘of relay
M then completes a circuit from the supply ter
minal B of a suitable local source of current over
‘of relay L2 over back contacts 0 and b of relays
Li and LB and the local winding of relay R to
terminal C. Relay R will thereby be restored to
normal, reenergizing relays Ll, LP and LB, and
‘then the timing relays will release in the order
back contact 01 of relay T and through the lower
L2, LP, LB and LI. Each code consists of sixteen
primary coil of transformer I3 to the common
impulses and hence relay R. is operated to nor
return terminal C of the local source. At the
mal by the ?nal impulse and the timing relays
same time, the closing of front contact 01 of relay
release in the order last mentioned at the end
M connects the secondary winding of transformer 10v of each code. A code may be initiated only when
i3 across the line wires Y and Z through the coils
relays LI and L2 are both released, and it follows
l2 and [2a of a low-pass ?lter and the closing of
that successive codes are spaced by an interval
front contact 0 of relay M completes the first of a
which is materially longer than any interval be
series of circuits governed by the associated line
tween successive impulses of a code.
relay R‘ in a manner hereinafter described, by 15
Each line relay R also controls a chain of
means of which relay T is operated periodically at
counting relays l to 8 and [6 for counting the
intervals spaced in accordance with the desired
code impulses, and in series therewith controls
code. Each time relay‘T picks up, the operation
a pair of stick polar relays KSI and KS2 which
of its contact d reverses the direction of the cur
are operated to normal or reverse to register
rent through transformer [3. The periodic oper 20 code character in accordance with the time
ation of relay ‘T thus causes transformer It to
spacing of the impulses. When relay R reverses
deliver induced impulses of alternately opposite
in response to the ?rst impulse of a code, the
polarity to the line circuit, the time spacing of
energization of relay LI as above described com
‘which characterizes the code. Each code nor
pletes a circuit from terminal B at the right
mally comprises sixteen impulses, providing ?f
hand contact 22 of relay R over front contact b
teen code elements of selectable character.
of relay Ll through the upper winding of relay
' Each line relay R, controls a group of slow re
KSI, back contact a of relay LB, front contact 9
lease timing relays Ll, L2, LP and LB, corres
of relay Ll through relay l to terminal C. Relay
l therefore picks up and relay KSI is held nor
ponding to the similarly designated relays of my
prior patent. The timing of these relays is gov 30
erned by means of electronic recti?ers as shown,
in the manner explained in the patent, the recti
?ers also serving to prevent contact sparking and
to minimize contact wear.
mal, as shown. Relay LB then picks up and
shifts the circuit for relays KS! and I to the
branch path extending from the right-hand ter
deenergizecl, and during the remainder of the 50
impulse.
minal of relay KSI over front contact a of relay
LB, back contact I) of relay 2 and thence over the
In response to the ?rst impulse of a code, each .
front contact a and winding of relay I to ter
line relay R reverses, and its right hand contact
minal C.
a completes a circuit from terminal B over back
If the ?rst element of the code is short, relay
contact a of relay L2, back contact 0 of relay LB,
KSi‘ is left deenergized with its contacts normal
through relay Ll to terminal C. Relay Ll then
as shown, when relay R is operated to the left by
picks up and its contact a completes a circuit for 40 the second impulse, but if the ?rst element is long,
relay L2, whereupon relay L2 picks up and com
relay Ll releases before the second impulse is
pletes circuits over front contacts 0 of relays L2
received and the closing of its back contact 0'
and L! to Dick up relays LP and LB, which relays,
shifts the circuit for relay l to include the lower
as will be apparent from the drawings, are ar
winding of relay KSI in place of its upper wind
ranged to pick up simultaneously and to release ~15 ing thereby reversing the direction of energize
successively following the release of relay Li or
tion of relay KS! to cause the contacts of relay
L2. When relay L2 picks up, its contacts a and
KS6 to move to the right. In this case relay
d shift the circuit for relay Ll to the left-hand
KSi is’ left deenergized with its contacts re
contact a of relay B. so that relay Ll becomes
versed when relay R is operated by the second
code relay Ll is energized by relay R over front
contact 0 of relay LB when relay R is in its
normal position, while relay L2 is'energized over
its own front contact a when relay R is reversed.
q
'
In response vto the second impulse of a code,
relay R closes a circuit fromjerminal B at its
left-hand contact 22 over front contacts 6 of
relay LB and b of relay L2 through relay KS2,
,RelaysLi and L2 remain pickedv up during the 55 back contact a of relay 8, front contact b of relay
brief intervals between ‘successive impulses con
I through relay 2 to terminal C, whereby relay 2
stituting the short elements of the code, and one
is picked up and relay KS2 energized in the nor
or the other of these relays releases during each
mal direction as shown. If relay L2 releases be
pause constituting a long element and they thus
fore the third impulse is received, relay KS2 will
serve to indicate code character. Relay LP is 60 be reversed thereby, that is, relay KS2 is left de
deenergized upon the release of relay Ll or L2 and
governs the length of the‘ long code elements
‘transmitted by the associated transmitter relay
energized in its normal or reverse position de
pending on whether the second element is short
or long, while the third element is being received.
T. Relay LB is a bridging relay which remains
Relays 3 to 8 are provided with circuits gen
picked up for the duration of a code and controls 65 erally similar to those for relays l and 2
various local circuits as hereinafter pointed out.
and are arranged to pick up one at a time in
Since relay R is normally deenergized, it may
the same Way in response to the corresponding
happen that it will be reversed accidentally when
impulses of the code, each in series with relay
the system is in its normal at ‘rest condition as,
‘ KS! or KS2‘ as described.
for» example, by an impulse of foreign current. 70
When relay 8 picks up, a chain repeat relay
‘If this occurs, relays Ll, L2, LP and LB will pick
CR is energized over a circuit extending from
up as described and then relays Ll, LP and LB
terminal B at the front contact f of relay LB
will release in that order, relay L2 remaining
' over contact 0 of relay‘ 8 and the winding of relay
picked up to close a local restoring circuit for relay
‘R. extending from terminal B at front contact or
CR to, terminalC, and relay CR, picks up com
pleting a stick circuit at its contact a whereby
2,409,696
7
relay CR is held energized until the end of the
code. Contact I) of relay CR prepares a circuit
for energizing relay l next inv order after relay
8, and relays l to ‘i operate through a second
cycle in response to impulses 9 and 15 of the
code.
Contact e of relay CR serves to cause
relay [6 to be operated in place of relay 8 in re
sponse to the sixteenth or ?nal impulse. It will
be understood that on each step except the last,
relay KS! or KS2 is positioned to normal or
reverse in accordance with the short or long
character of the corresponding code element and
is held deenergized in its last operated position
to store the code character for the duration of
the next succeeding code element. As explained 15
in more detail hereinafter, contacts b of relays
KS are included in circuit portions leading over
Wires 56—59 to coding unit terminals which
may be adiustably connected externally to those
terminals which lead over wires 22-21 to the
right-hand terminals of the counting relay winde
ings. These circuit portions provide selectively
controlled connections to the common terminal C
of the locaLsource which serve during the ?rst
8
lamps, of which only the one for station No. 1
is shown, this including a starting button IPB for
initiating the transmission of a control code con
taining the code call for station No. 1, a switch
lever SW and a signal lever SIG for controlling
the switch and signal relays at station No. 1,
the levers being operatively associated with the
coding unit by the energization of a selector relay
OIS. The indication lamps of the panel are con
trolled by a group of indication relays K, which
are operatively associated with the coding unit
by the energization of a delivery relay OID,
energized in response to an indication code re
ceived from station No. 1.
Each code call comprises a distinctive combi
nation of long and/ or short steps, four steps pro
viding sixteen such code calls. The o?ice coding
unit is arranged to transmit control codes of
sixteen steps or code elements, in which the ?rst
and second are short; steps three to six, com
prising the code call, either short or long; and
steps seven to ?fteen either short or long, to
selectively control nine devices at the selected
station, step sixteen governing the return of the
apparatus to normal at the end of the code. In
the speci?c arrangement chosen for illustration
the code call for station No. 1 comprises four
long steps; the seventh step is used to control
a maintainer’s call signal lamp MC, at the
selected station, by closing a key M03, and
steps eight, nine and eleven are used to control
the relays WS, LI-IS and RHS in accordance with
the positions of the control levers SW and SIG.
The remaining steps, not needed for control pur
cycle of operation of the counting relays to pre
vent their continued response to a code to which
the apparatus is not adjusted to respond and to
check the positions of the pilot relays P of Fig.
1B. During the second cycle of operation of the
counting relays, the closing of contacts 0 and d
of relay CR connects wire 56 to wire 58, and wire
5'1 to wire 59, and thus renders the operation of
the counting relays independent of the position
of contacts b of KSI and KS2, and during this
cycle the pole changer contacts a and c of the 35 poses, are made short steps.
Each code call is set up for transmission by
relays KS control the polarity of the current sup
positioning a group of four pilot relays, P3 to
plied to a series of circuits prepared by the clos
P5, Fig. 1B, in a distinctive pattern, the contact
ing of front contacts 1‘ and g of relay CR, com
d of each of these relays controlling relay T to
pleted externally by suitable connections to the
coding unit terminals over wires 46-55, which 40 generate a long step of corresponding number if
the relay P is picked up and to generate a short
as shown in Fig. 1B control the indication relays
step if such relay remains released.
K. Relay KSI also controls relay E in accordance
The step by step transmission of a control code
with the character of the ?rst element of the
to station No. 1, in response to the operation of
code, which is made a short element in each con
trol code transmitted from the office and a long 45 the starting button IPB will now be described,
assuming the control levers to occupy their
velement in each indication code transmitted from
normal positions as shown.
a ?eld station. The energization of relay E con
The transmission of a code by any coding
ditions the coding unit to function as a receiver.
unit may be initiated only when the coding unit
The application of the apparatus of my in
vention to a speci?c installation will now be ex 50 is in its normal at rest condition, so that relays
plained, assuming for sake of illustration that
it is employed in a centralized traffic control
LI and L2 are both deenergized. In that case
terminal B at back contact 0 of relay L2 is con
nected over back contact d of relay Ll to wire l1,
and a code may then .be initiated by connecting
track plan in Fig. 2B. This group comprises a,“ 55 wires ii and I5 together to complete a circuit to
pick up the starting relay ST. Assuming that
track switch IW and a group of signals LH and
button IPB is operated, under the condition de
which as indicated diagrammatically on the
scribed, the connection from terminal B at wire
drawings are arranged to be controlled by code
ll will be extended over contacts I) to e of button
by the operation of a group of polar stick relays
including a switch control relay WS and the 60 lPB to wires 13 to 16 and thence through the
upper windings of each of the relays P3 to P6
signal control relays LHS and RHS. It is to be
to terminal C. Relays P3 to P6 pick up, as re
assumed that the installation includes not more
quired for the code call of four long steps identi
than sixteen such locations, each having a coding
fying station No. 1, and extend the connection
unit arranged as in Fig. 2A and connected by
from terminal B at wire I1 over their contacts
line wires Y and Z with one at the control o?lce,
0 to wire [5 and thence through relay ST to
arranged as in Fig. 1A. At the location of switch
terminal C. Relay ST picks up, and completes a
IW, the coding unit connections are arranged
circuit from terminal B over its front contact c,
precisely in Fig. 2B, this location being identi
shown at the right in Fig. 1A, over back contact
?ed as “station No. 1,” the connections at the
other stations being differently arranged so that 70 1‘ of relay M to wire 2| and thence over con
tacts e of relays P3 to P6 in series, through relay
each is responsive to a distinctive code call.
OlS to terminal C. Relay OIS picks up, and
At the office, the coding unit connections are
the closing of its front contact 7‘ connects ter
arranged as shown in Fig. 1B, and include a con
minal B at contact I of button IPB to wire 28 to
trol panel for each station containing the usual
. complement of control levers and indicationg 75, complete a circuit over front contact a of relay
system for contr‘olling spaced groups of traf?c
governing devices such as the one shown in the
9
2,409,696
ST, back contacts g and h of relays LB and E
through relay M to terminal C. The energiza
wire 6! a short odd-numbered code element will
be generated for the reason that relay T will be
tion of relay M over the circuit just traced ener
shunted as soon as the corresponding counting
gizes the impulse transformer l3 and connects it
to the line as already explained.
relay' picks up.
If the connection is made to
wire ll, a long element will be generated, relay
T being held energized after the counting relay
has picked up until relays Li and LP release and
the connection is completed by the closing of
It is to be un
derstood that when transformer I3 is energized
over the branch including back contactd of relay
T the resultant line impulse is of normal polarity
to operate each line relay R to the left, and when
“rack contact b of relay LP.
_
it is energized over front contact (1 of relay T 10
The even-numbered code elements are similarly
the resultant impulse is of reverse polarity to
controlled by external connections to ‘wires Ell
operate each line relay R to the right.' The
and ‘Ill. The second element, for example, will
initial impulse due to the closing of contact a
be a short element when wire 32 is connected to
of relay M therefore tends to operate the relays
wire 60 because‘ a circuit will be closed to pick up
R to the position they already occupy and is not
relay T, at back contact (1 of relay l as soon
part of the code, its purpose being to insure the
as relay l is released following the energization
proper initial magnetization of transformer l3.
of relay 2. If on the other hand wire 32 is con
When relay OI S picks up, the opening of its
nected to wire 70, a long element will be gener
back contact is extinguishes any of the indication
ated, relay T remaining deenergized until relays
lamps of the panel, such as lamp NH, which may 20 L2 and LP release toclose the pickup circuit at
be lighted, thereby indicating to the operator
back contact c ofrelay LP.
that the code has been initiated. When relay
It follows therefore that after relay T is initi
M picks up, it completes a stick circuit for the
ally picked up by the operation of relay ST it
pilot relays P extending from terminal B at front
continues to operate periodically to generate a
contact 6 of relay M to wire I 9, and through the 25 code, provided relay M remains picked up and the
lower winding and front contacta of each of the
associated counting relays respond. Each time
relays P3 to P6, to wire I 8, and thence to ter
relay T picks up it is held energized over its
minal C at back contact 0 of relay E. The clos
stick circuit until the associated line relay R re
ing of front contact I of relay M connects ter- '
verses to pick up an odd-numbered counting re
minal B directly to wire 2!, to hold relay OIS 30 lay, contact d or e of which connects terminal
picked up, and the operated starting button IPB
B over wire 6|, or‘ ‘H to the left-hand terminal of
may now be released.
relay T to release it by short circuiting its wind
As soon as relay M picks up, relay T becomes
ing. Each time relay T releases, relay R is ‘oper
energized over the circuit extending from ter
ated to normal to pick up an even~numbered
minal B at contact 0 of relay M, contact b‘ of 35 counting relay, whereupon the last operated odd
relay ST, through the winding of relay T and
numbered relay releases to prepare a pick-up
resistor 29 to terminal C, and relay T picks up to
circuit for relay T closed over wire 60 or 10.
deliver the ?rst impulse of the code to the line
In the control code being described, the ?rst
to reverse all line relays R in unison, each of
step is short, due to the fact that relay T is
which operates its timing relays and counting 40 shunted by the connection over front contact (1
relay l as already described. In the coding unit
of relay I and wires 31 and BI, Fig. 113,‘ as soon as
which is transmitting the code the energization
relay I picks up, the code being thereby distin
of relay LB transfers relay M to a holding circuit
guished from an indication code transmitted from
having one branch extending from terminal 13
a ?eld station which, has a long ?rst step. The
over the normal contact 5 of relay R and‘ back 45 second step is made a?xed short step by a con
contact I) of relay T, and another branch extend»
nection over back contact (I of relay I- and ‘front
ing from terminal 13 over the reverse contact I)
contact (1 of relay 2, over Wires 32 and‘ 66, over
of relay R and the front contact b of relay T;
which relay T is picked up in response to the re
thence over front contacts I) and g of relays M
lease of relay I. The front contacts d of relays
and LB, back contact 71. of relay E‘ and the winding 50 P3 to P5 are nowclosed, so that wires 33 to 35
of relay M to terminal C. Relay ST becomes
are connected to wire lllor ‘H and‘ the closing of
deenergized but is made sufficiently slow‘ release
thecircuits including the front contacts a! of re
by the provision of a recti?er unit‘as- shown so
lays 3 to 6 is delayed until relay LP releases on
that although its energizing circuit is; opened
each of the steps three to six, thereby making
when relay‘Ll picks up, it remains picked up 55 these steps long. Assuming key MCB to be open,
long enough to permit relay LB; to pick up to
relay P‘! will occupy its released position, and the
complete the stick circuit for relay _M. When
‘seventh step will be made short due to the con
relay T picks up it is held energized independently
nection from wire 3'! over back contact (I of relay
of relay ST over a stick circuit including its own
front contact a.
When relay I picks up, a con
nection extends from terminal B at contact 0
of relay M over back contact I) of relay CR and
front contact (1 of relay I to wire 3!. The wires
3! to 45, inclusive, provide external connections
Pl’, to wire 6|.
60
The code transmission continues through the
seven steps as described only if the code delivered
to the line by which relays KSl‘and KS2’ are
operated, is of the corresponding pattern. Un
less the ?rst step is short, the o?ice relay E picks
for completing a series of circuits, closed one at a 65
up as hereinafter described, and its back contact
time by the counting relays, for controlling the
periodic operation of relay T to determine the
desired. character forv each. of the elements one to
?fteen, respectively, of the code. Any of these
h opens the circuit for relay M to stop further
transmission, Unless relay KS2 remains normal
to register a short secondstep, relay 3 is not
operated, its circuit extending from its right
wires connected to terminal B over a contact 70
hand terminal over wires 22 and 56 to terminal
(1 or e of an odd-numbered counting relay may
cat the normal contact I) of relay KS2. Simi
be connected externally to wires 6| or ‘H to extend
larly, the operation of relay 4 is dependent upon
the connection of terminal B to the‘. left-hand
the reversal of relay KS! to register the long
terminal of relay T so as to shunt the relay to
third step, the circuit for relay 4 extending from
cause it to release. If the connection is madeto 75 wire 23 over ‘front. contact b of relay P3 to wire
aroma
59 and thence to terminal C over the reverse con
tact b of relay KSI. Relays 5 to ‘I are controlled
12
operate until the sixteenth step is reached, in
When relay CR picks up on the eighth step,
its contact 22 transfers the control of relay T from
unison with the of?ce relays, and when relay CR
picks up on the eighth step, a branch of its cir
cuit is closed from terminal B over front contact
I) of relay E to wire 9, thence through relay MCR
to terminal C, over the pole changer contacts
e and ,f of relay P1, whereby relay MCR is ener
gized in the normal direction if relay P1 is re
leased, and in the reverse direction if relay P1
is picked up.
It is to be understood that relay MCR is of a
the d contacts of the counting relays to a series
of eight similar circuits extending from contacts
e of relays 8 and l to ‘I, respectively, to wires 38
to 45 extending over contacts b to z‘ of relay OlS,
to light lamp MC when energized in the reverse
direction, and assumes the released position when
energized in the normal direction, remaining in
over similar circuits including front contacts b
of relays P4 to P6, while relay B is controlled over
a circuit including back contact b of relay Pl.
It follows therefore that the office relay 8, and
relay CR controlled thereby, is operated only if
steps one to seven of the control code are of the
desired character.
for controlling the character of steps eight to
magnetic stick type and that it closes its contact
its last operated position when deenergized.
Assuming the- eighth step of the code being
?fteen in accordance with the positions of the
received to be short, relay KS2 will occupy its
levers of the selected panel in the same manner
normal position and the polar stick relay WS 01'
as the preceding steps are controlled by contacts
d of the relays P, as above described. The cir 20 Fig. 2A will be energized momentarily in the nor
mal direction at the beginning of the ninth step
cuit for step eight, for example, extends from
over a circuit extending from terminal B at the
wire 38 over contact b of relay OIS and lever
right-hand contact I) of relay R, contact (1 of
SW to wire 60 or ‘I0, and is therefore made a short
relay LB, normal contact a of relay KS2, contacts
step if lever SW is normal and a long step if lever
SW is reversed. The signal lever SIG controls 25 g of relays CR and E, contact f of relay I, wire
48, relay WS, wire 46 and thence to terminal C
the character of steps nine and eleven, both of
at the normal contact 0 of relay KS2. If lever
which are made short when lever SIG is normal
SW had been reversed to make the eighth step
as shown. Step nine is made long and step eleven
long, relay KS2 would be reversed, and relay
short when lever SlG occupies its left-hand posi
tion, and step nine is made short and step eleven 30 WS would be energized in the reverse direction
on the ninth step. Relays LHS and RHS are
long when lever SIG occupies its right-hand po
similarly controlled in accordance with the char
sition, as will be clear from the drawings. The
acter of steps nine and eleven, respectively, as
remaining steps, in the speci?c arrangement de
reflected by the position of relay KSI, these re
scribed, are made short steps by the provision
of direct connections from contacts d and f to i 35 lays being operated to normal or reverse on steps
ten and twelve, as will be clear from the drawings.
of relay OIS to wires 60 and SI.
Each station coding unit is adapted to be con
The transmission of the code being described
is terminated with the dropping of relay T to
ditioned to transmit indication codes in response
begin the sixteenth step, during which the ap
to the energization of a code storing stick relay,
paratus returns to its normal at rest condition. 40 such as the relay ICS of Fig. 2B.
Relay H5 is the ?rst to release, then relays L2,
When relay I CS is energized, it connects wire
LP and LB release. Relay LB releases relays M,
l1 over its front contact I) to wire IE, to which
CR and LI, and relay M releases relays P3 to P6
the starting relay ST of Fig. 2A is connected,
and OIS, and ?nally, relay Ll releases.
‘and this relay ST when energized completes a
45
' Considering now the mannerin which the con
connection from terminal B over wire 28 and its
trol code just described is selectively received at
front contact a to pick up relay M. The ener
station No. 1, and referring to Fig. 2A, since a
gization of relay ICS thus corresponds to the
coding unit like that shown in this view is pro
operation of the starting button IPB in the con
vided at each ?eld location, each of which is
‘trol code already described, that is to say, it is
similar to that of Fig. 1A except for its external 50 effective When the system is at rest, to pick up
connections, it follows that the line relays R and
relays ST and M to initiate the transmission of
the timing relays at all stations operate in uni
an indication code by relay T at station No. 1.
son with the corresponding o?ice relays in re
Relay ICS may be picked up in response to
sponse to the control code, likewise relays I, 2
changes in the condition of any of the indicating
55
and 3.
relays at station No. 1, as hereinafter described in
Each station coding unit is conditioned to
detail; but it is also picked up upon the delivery
function as a receiver by the energization of its
‘of a control code to station No. 1 over the circuit
relay E on the second step, as hereinafter de
extending from terminal B at wire 9 through its
scribed.
At station No. l, relays 4 to ‘I pick up on the 60 upper winding to terminal C.
The transmission of a control code to station
corresponding steps because wires 23 to 2B of
No.
1 will thus be followed by a transmission of
Fig. 2B are connected to wire 58 or 59 and the
an indication code from station No. 1, in which
circuits for relays 4 to ‘l are similar to those estab
the operation of the station transmitter relay T.
lished for the corresponding of?ce relays when
of the line relays R and of the timing and count
65
relays P3 to P6 are picked up, as already de
scribed.
It is to be understood that at each other sta
tion one or more of the wires 23 to 26 is con
nected to wire 56 or 51 instead of to wire 58 or
ing relays controlled thereby are generally similar
to those already described. The indication code
comprises sixteen steps in which the ?rst is made
a long step by connecting wire 3| to wire 1!, as
59, as illustrated in Fig. 2C, for example, and 70 shown in Fig. 2B, instead of to wire 6|. Wires
32 to 31, in Fig. 2B, provide connections similar to
consequently at each such station the operation
those provided for the office relay T in the con
of the counting relays terminates before reach
trol code described. Consequently steps two and
ing the eighth step of the code containing the
seven will be short and steps three to six long,
code call for station No. 1.
At station No. 1, however, the counting relays 75 the connections of wires 33 to 36 to wire ‘In or
2,409,696
13
14
‘H providing for the transmission of the code call
2, LI and LP in‘ each coding ‘unit. Since the
connection for shunting relay T at each ?eld
station includes wires 3| and "II, it will remain
of four long steps identifying station No. 1. '
It is to be understood that at each other station
one or more of the wires 33 to 36 is connected
open and the station relay T will remain picked '
to wire 60 or 6|, as illustrated in Fig. 2C, for Or up until the associated relay M is released to
example, to effect the transmission of different
disconnect transformer 13 at that station from
code calls.
the line, leaving the office transmitter in control
When the coding unit of Fig. 2A is in the trans
to continue the code.
It has already been mentioned that the coding
relay M is connected to wire 19, preparing a 10 unit at each ?eld location is arranged to receive
circuit which may be completed at contact a of
control codes as identi?ed by a short ?rst ele
relay R7 through the upper winding of relay
ment bysuitable connections for relay E. Thus
P1 to terminal C, whereby relay P1 may be con
in Fig. 2A, wire ll is‘connected to wire [4, and
trolled to make the seventh step short or long,
since relay KS! remains in its normal ‘position,
in accordance with the position of an indicating
the‘station relay E is energized in multiplewith
relay RT. The circuit by which relay P1 is held
relay 2 at the beginning of the second step over
energized in the receiving condition is ineffective
a circuit extending from terminal B at the left
mitting condition, terminal 13 at contact’ e of
when relay P1 is subject to control by relay R1.
wire I 8 being connected to terminal 0, at‘ back
contact c of relay E.
Steps eight to ?fteen of each indication code
may be used to indicate the condition of eight
other station devices by suitable connections to
wires 38 to 45. As shown, wires 38 to 42, con
trolling the transmission of steps eight to twelve,
hand contact b of relay R, front contact e of
relay LB, normal contact a of relay KSI, wires
20 l4 and II, contact 0 of relay l and the upper
are connected to contacts (2 of the indicating re
lays NWP, LHR, RWP, RHR and TS, while wires
43. 44 and 45 are connected to wires 5!, 60 and
SI, respectively, so as to make these steps short.
Since all the connections. except the one for the
?rst step, are similar to those for the o?ice relay
T already described, no further description of
the detailed operations involved in transmitting
an indication code is deemed necessary.
Since the first‘ step is long, relay E at the .
transmitting station is not operated. This is also
true of relay E at each other ?eld station, and
consequently none of these are conditioned to re
ceive the code.
Since each transmitter has access to the line
when it is free, it may happen, that two or more
are set into operation at the same time. If this
occurs, interference is avoided by stopping the de
livery of impulses to the line by any coding unit
which is transmitting a code if its line relay Pt? '
is operated by a received impulse during a pause
in the operation of the associated transmitter T.
If relay R is thus operated ‘to a position out of step
with the relay T it controls, the stick circuit for
relay M is opened at contact b of relay R, releas- ‘
ing relay M to disconnect the transmitter from
the line, the coding unit then being in condition
to transmit its code in its entirety when the ‘line
is again free.
winding of relay E to terminal C. Relay E there~
fore picks up, and completes a stick circuit over
its contact a and lower winding. extending to
terminal B at contact f of relay LB.
By referring again to Fig. 1A, it will be seen
that the o?ice coding unit is conditioned to receive
indication codes having a long ?rst element by
connecting wire H to wire 47, in which case the
pick-up circuit for the oi?ce relay E extends to
terminal B over the reverse contact a of relay
KS]. As already explained, relay KS1 occupies
its reverse position during the second step only
if the ?rst element of the code is long.
Referring now to Fig. 1B, it is to be understood
that the key MCB controls the character of the
seventh step of a control code initiated by the
operation of any one of the buttons IPB to lliPB,
to operate a maintainer’s call signal at the se
lected station, and the operationof this feature
will now be described. Assuming that key M013
is closed, and that button lPB is operated, a con
trol code will be initiated as already described.
When relay M picks up, a circuit is closed from
terminal B at its front contact 6. Fig. 1A, over
wire [9 and the contact of key MCB. Fig. 13, wire
‘l1 and the upper winding of relay P1 to terminal
0. Relay P'l therefore picks up, and its contact
(I shifts the connection of wire 31 from wire 6!
to wire 1!, causing relay T to generate a long sev
enth step during which relay Ll releases to re
verse relay KSI, the control code being in other
respects‘ similar to the one already described in
detail.
‘
‘
‘
'
At station No. 1, the release of relay Ll on
Since the line relays R are of the, stick polar‘ 55 the seventh step completes a circuit from termi
type, relay R at a station WhiCh‘is transmitting
nal B at contact 1‘ of relay LB, Fig. 2A, over back
a long code element is temporarily deenergized
contact a of relay CR, front contact e of relay E,
and in condition to respond to an impulse re
back contact e of relay LI, contact 0 of relay '1,
ceived from the line as required for the operation‘
wire 51 through the lower winding of relay FL
of this feature.
60 of Fig. 213, to terminal C, so that the station re
It will be readily apparent, therefore, that the
lay P1 picks up completing a stick circuit over its
use of'the line is allotted to the different stations
contact a and wire l8, extending to terminal B
in accordance with the relative superiority of
at front contact 0 of relay E.
'
their code calls, a short element taking precedence
At the oflice and at station No. 1, a circuit is
over a long element in each instance. Control 65 prepared for relay 8 extending from wire 21 over
codes transmitted from the o?ice are given pre
front contact b of relay Pl.’ wire 59 and the re
cedence over indication codes transmitted from
verse contact b of relay KS! to terminal C, so
the stations by the provision of a short ?rst ele
that relays 8 and CR pick up on the eighth step
ment in each control code and of
long ?rst
and at station N0. 1, terminal B is connected to
element in each indication code, as already eX~‘
wire 9, energizing relay MGR in the reverse di
plained.
Thus when a control code and an indi
cation code areinitiated at the same time, the
line relays at the oflice and at each station will
‘be operated by the second impulse of the code
rection over front contracts e and ,f of relay
P1 to light lamp MC, as required. The remain
ing operations are similar to those occurring on
the corresponding steps of the control code al
delivered by the of?ce relay T, energizing relays‘ 75 ready
described.
‘
2,409,696
15
In describing the step-by-step operation of the
system, it has been assumed that the apparatus
of Fig. 1B has been arranged for sixteen stations,
using the elements three to six of the code in
different combinations of long and short elements
to provide the sixteen code calls. Step two of
a circuit including wires 41 and H over which
relay E, Fig. 1A, picks up. On the second step,
the code is made a ?xed short element by con
necting wire 32 to wire ‘Ell. A pilot relay P is
provided for each of the steps three to seven,
having a contact d for controlling the transmis
the closing of front contact e of relay E prepares
pick-up circuits for the relays P which may be
traced from terminal B at contact 1‘ of relay
LB, back contact a of relay CR, front contact e
of relay E, back contact e of relay Ll or L2, con
tacts c of relays 2 to 1 and the corresponding
wires 62—61, through the lower windings of re
lays P to terminal C. In the case of relays P2
to P6, the connection to terminal C includes wire
[9 and back contact e of relay M.
Since the third step is long in the code being
described, relay P3 will pick up over wire 63 and
front contact 0 of relay 3 in response to the clos
ing of back contact 6 of relay Ll on that step,
and relays P4, P5 and P6 will pick up over corre
sponding circuits on steps four, ?ve and six.
Since the seventh step is short, relay P1 remains
sion; that is to say, each of these steps is made
long or short according to the position of the
associated relay P. Relays P2 to P6 maybe
arranged in sixteen different ways to complete
a circuit from wire 2| over their contacts e to i
to select any one of sixteen S relays, as indicated
by the references OIS to OIBS, in Fig. 1B.
- By the addition of a pilot relay P2 to the
group of relays P3 to P6, to control the character
of the second step, the number of stations which
the system is adapted to control is doubled, five
steps providing code calls for thirty-two stations.
Relay Pl, as shown, provides an additional con
trol or indication element in each code, but this
released.
A stick circuit is completed by each relay P
relay may be used for station selection by arrang
ing its circuits like those for relays P3 to P6, and
it follows that the system may employ codes hav
ing either ?ve selecting steps and nine function
control steps, or six selecting steps and eight
function control steps, the latter arrangement
providing for the control of sixty-four stations.
For the control of sixteen stations, as shown,
the circuits controlled by contacts 6 to z' of the
relays P consist of two sets of circuits for eight
S relays each, selected over front and back con
tacts e of relay P3. Similarly, to control thirty
16
received impulses and controls the associated tim
ing relays, and that relays l and 2 respond as in
the codes already described. Since the ?rst step
is long, relay KSI is operated to reverse in series
with relay l and its right-hand contact a prepares
which picks up in response to the closing of back
contact e of relay Ll or L2, which includes its
own front contact a and extends over wire l8
to terminal B at front contact 0 of relay E.
A check to insure against the failure of the
relays P to assume the positions required for the
code call being received is provided by the con
nections for the counting relays 3 to 8 which ex
35
tend to terminal C over wires 22-21 and con
tacts b of the relays P, wires 56-—59 and contact
b of relay KSI or KS2. In response to each long
element, relay KSI or KS2 is reversed and com
pletes a connection to terminal C over wire 58
to wire 2| over front and back contacts, respec
tively, of a relay P2, may be used. To obtain the 40 or 59 and front contact I) of that one of the re
lays P which is picked up by the same long ele
requisite number of contacts one or more addi
ment, to prepare ‘a circuit for the counting relay
tional relays may be provided for any of the
next to be operated. If the element is short,
steps. Thus for the two sets of sixteen circuits
relay KSI or KS2 remains in its normal posi
mentioned, relay P4 may be replaced by a pair
of relays HA and HE, having their windings 45 tion and the relay P is not operated, and the
circuit prepared for the next counting relay in
connected in parallel and their contacts a in se
cludes wire 56 or 51 and a back contact b of the
ries, as shown in Fig. 4, likewise relays P5 and P5.
relay P. In case a pilot relay such as P2 is
Any of the thirty-two circuits thus provided may
omitted, as in the case being described, the cor
be branched over front and back contacts of re
responding wire such as wire 22 is connected
lay P‘! to provide circuits for two~S relays, as is
directly to wire 56 or 58, and as shown, relay 3
obvious.
responds to the third impulse only if the second
The pilot relays have a dual function. When
two stations, two sets of circuits for sixteen S
relays, each set like the one shown, but connected
the coding unit is in the receiving condition,‘ with
relay E picked up, the relays P are picked up one
at a time in response to corresponding long ele
ments of the code as received, and current is
supplied to wire 2| by relay CR to pick up the
selected relay S on the eighth step of the code.
The relays P also serve to condition the coding
‘unit to transmit a code. That is to say, they
may be set up in any desired combination and
the corresponding S relay energized when the
system is at rest by the operation of a starting
button or code determining relay to initiate the
transmission of a code, in which case the P
relays determine the pattern of the station code
call, as already mentioned.
The step-by-step operation of the apparatus of
Figs. 1A and 1B in receiving an indication code
will now be described. It will be assumed that
the code received is one transmitted from station
No. 1 as above described, in which steps one and
three to six are long steps, and steps two and
~seven to ?fteen are short, and it will be under
step is short,
.
.It follows that relay 8 responds to the eighth
impulse of a code to pick up relay CR only when
the relays P have been set up in a, combination
representing the code call received by the relays
l to ‘I and KS. If the ?rst code element is long,
as assumed so that relay E is picked up, relay
8 completes a circuit extending from terminal B
at contact 1‘ of relay LB, contact 0 of relay 8,
contact b of relay E, back contacts 0 and j of -
relays ST and M, to wire 2|, and thence as
already described in connection with Fig. 13
over front contacts e of relays P3-P6 and the
winding of the selector relay OIS to terminal C.
Relay OIS is thus energized in multiple with
relay CR and the closing of front contact a of
relay CR completes a stick circuit for holding
both of these relays picked up until the end of
the code. When relays OIS picks up, a branch
of its circuit extending from terminal B over con
tact b of relay E to wire 9 is closed at contact a
of relay OIS through the winding of relay OID
to
terminal C, whereby relay OID is energized.
75
stood that the o?ice line relay R responds to the
!
'
i
17'.
2,409,696
The closing of contact a, of relay 0! D then com
pletes a circuit for operating the indication relay
K1 in accordance with the character of the sev
18
the apparatus of Fig. 1B, with reference more
particularly to the upper right-hand portion of
that view, which-shows circuits controlled by the
enth element, this circuit having a connection to
buttons for controlling the relays P2‘~—P6 as re
terminal B at wire 9 whereby relay ‘Kl is ener
quired by various code calls. The front contacts
gized in thenormal or reverse direction accord
b to e, etc. of buttons PB, which provide a con
ing to the position of contacts e and f of relay P7.
nection from wires ‘H to wire l3—16, correspond
The indication relays may be ‘of the ordinary
to the long; elements in each of the ?fteen code
stick polar type, but preferably are of the type
cajlls setup by the operation of buttons IPB to
shown in Letters Patent of the United States to 10 IEPB. The sixteenth code call, assigned to but
Agnew No. 2,301,992, granted November 1'7, 1942,
for Electrical relays,.whic-h relaysare operable
to their picked up and released positions by cur
rent of normal and reverse polarity, respectively,
and are adapted to' remain in their last operated
position when deenergized.
Contacts b to z‘, inclusive, of relay OiD prepare
circuits for operating the relays K connected
ton IBPB, does not require the energization of
any of the relays P3 to P6. It follows that the
code combination assigned to each of the panels
may be readily identi?ed from the drawings.
Terminal B is connected to wire I‘! only when
the system is at rest, or at the end of a relatively
long time interval following the sixteenth im
pulse of a code, as already explained, under which
thereto in accordance with the character of steps
condition the operation of any of the buttons
eight to ?fteen of the code. For example, the 20 except IEPB extends the connection from ter
operation of relay R to the right in response to
minal B to one or more of the wires 'l3-'-'l6 and
the ninth impulse connects terminal B to contact
thence through the upper windings of the corre
a of relay KS2, which relay is then held deener
sponding relays P to terminal C, thereby ener
gized in its normal or reverse position to store the
gizing a relay P for each long element of the
character of the eighth element. Relay l picks
selected code call. The energized relays P by
up, completing a circuit from terminal B to
closing their contacts 0 complete a connection
terminal 0 over contacts a and c of relay KS2,
from wire I‘! to wire I 5 toipick up relay ST. The
including contacts g of relays CR and E, contact
operation of button IBPB completes a connection
7‘ of relay l, wires 48 and 45, contact b of relay
from wire I‘! over its contact b to wire IE to
01D and the winding of relay NWK, whereby 30 pick
up relay ST without operating any of the
relay NWK is energized normal or reverse to cor
relays P, the code call for this button comprising
respond with the position of relay KS2. The op
four short steps.
eration of relay R to the left in response to the
When relay ST picks up, a circuit is closed
tenth impulse opens the circuit for relay NWK
from terminal B at its front contact 0 over back
and connects terminal B to contact a of relay
contact 1‘ of relay M to wire 2| to pick up the
KS], and also restores relay KS2 to normal and
relay S which corresponds to the combination
energizes relay'2, while relay KS2 is held deener~
set up by the relays P, opening back contact it
gized in its normal or reverse position to store
of the operated relay S to extinguish the indica
the character of the ninth element. Relay '2
tion lights of the selected panel. If the relays P
completes a ‘circuit from terminal B to terminal
have been positioned properly this panel will be
C over‘contacts a. and c of relay KSl, including
the one containing the operated button. That
contacts 1‘ of relays CR and E, contact 1‘ of relay
is to say, relay 015 will be energized only if
2, wires 49 and 4'1, contact 0 of relay OID and the
each of the relays P3 to P5 pick up in response
winding of relay LHK, whereby relay LHK is
to the operation of button I PB, whereupon ter
energized normal or reverse to correspond with ‘
minal B at contact f of button IPB will be con
the position of relay KSl.
nected over contact 9' of relays OIS to wire 28
The operations occurring during the remain
and thence over contact a of relay ST, to pick
ing steps of the code are similar to those ole
up relay M, thereby setting relay '1‘ into operation
scribed, as will‘be readily apparent. It follows
to transmit the code as already described.
that on steps eight to thirteen, respectively, re
It is to be understood that the connection to
lays K'I, NWK, LHK, RWK, RHK and TK will
wire 28 over contact 1‘ of each of the starting but
each be operated to a position re?ecting that of
tons IPB to E?PB includes contact 9' of the cor
the corresponding indicating relay at station‘No.
responding S relay. It follows that relay M will
1. Steps thirteen to ?fteen are ?xed short steps
not pick up if, due to a fault, the pilot relays
in the code Ibeing described, but additional indica- . 55 P do not occupy the positions required for the
tion relays Kl3 to Kl5 may be provided for indi
code call identifying the operated starting button.
cating the character of these steps if required.
When relay M picks up, its front contact 6
The operation of relay R to the left in response
connects terminal B over wire [9 and the lower
to the sixteenth impulse picks up relay l6, and
windings and contacts a of the energized relays
contact b of relay l6 completes the circuit for 60 P2 to P6 to wire l8 and thence to terminal C
operating relay K|5 to a position in accordance
at back contact 0 of relay E, and it follows that
with the character of the ?fteenth element. Re.
the operated button may be released as soon as
lay l? is not provided with a stick circuit and
relay M picks up to initiate the code.
releases after a short interval. Relay R. re
The condition of relays P2 to P6 cannot be dis—
mains in its normal position, consequently relays
turbed by further operation of any of the starting
L2, LP and LB release in that order. Relay LB
buttons PB because when a code is being sent
releases relays CR, E, OIS and OID, and relay
or received, terminal B is disconnected from
E releases the energized P relays, thereby placing
wire l7.
the apparatus in condition to receive a new code.
As previously explained, when relay M is picked
Relay LB also deenergizes relay Ll, which is the 70 up, wires 3l—3'l afford connections over contacts
last to release. The release of relay L'l connects
d of the counting relays to wires 60, 6! , ‘iii and 'H
terminal B to wire ll, thereby placing the ap
for governing the operation of relay T to generate
paratus in condition ‘to initiate the transmission
the ?rst seven elements of the code, the character
of a new code.
'
.
,
.
.
of the variable elements being determined by the
Considering now the transmitting condition of
positions of the contacts d of the pilot relays P
2,409,696
19
in the circuits. At the beginning of the eighth
step, contact b of relay CR picks up to shift the
circuits for relay T to contacts e of the counting
relays and wires 38-45, and thence over contacts
I) to i of that one of the selector relays 01S to
OIGS which is energized, and contacts of the
20
ilarly, when button 3PB or APB is operated, the
opening of back contact at of the operated button
prevents the energization of wire ‘E5 by operation
of any higher numbered button. In place of
back contacts in the sets of code determining
contacts, back contacts of the P relays may be
used with the same e?fect; thus back contacts I
control levers of the corresponding panel to wires
and g of relay P3, which open in response to the
(ill, 6|, I!) and ‘H, or directly to wire 6|] or 6|
operation of relay P3 by any of the buttons
when a control step is idle, and determines the
5PB—8PB, prevent the energization of wires ‘M
character of the ninth to ?fteenth elements, in 10 and 15 by operation of any higher numbered but
the manner already pointed out.
ton. It will be clear from the drawings that the
When relay T drops in response to the ener
sets of code determining contacts are connected
gization of wire 45 to transmit the ?nal impulse
to the conductors 13-1’! in such an order that
of the code, it remains released. Relay R there
they are eiiective only‘one set at a time, in a
fore remains in its normal position, and relays
?xed order of code superiority.
'
l6, L2, LP, LB and LI release in that order.
It is believed that the modi?cation of the code
Relay LB releases relays M, CR and the energized
determining circuits to provide code calls of ?ve
selector relay S, and then relay M releases the
or six steps as required for the control of addi
energized relays P. Relay Ll, which is the last
tional stations will be obvious from the circuits
to release, connects terminal B to wire H to 20 as shown. Thus, for example, to control thirty
render the buttons PB e?ective to control the
two stations, two groups of sixteen contact sets
initiation of the next code.
each may be used, each similar to the one shown
It is to be noted that each operation of relay '1‘
except that in one group each set will have an
to generate either a short or long code element
additional contact for energizing relay P2, while
25
is dependent upon the closing of a circuit over
the contacts of the other group will be connected
one of the wires 31-31 or 38—-45. A failure oi
over back contacts I to i of relay P2, as indicated
any of the circuits to close would make the ele
by dotted lines in Fig. 1B.
ment inde?nitely long, allowing the timing relays
In certain applications of the centralized traffic
to release as at the end of the code to reset the
control system of my invention, particularly in
transmitting apparatus in its normal condition. 30 connection with the control of train movements
A similar release at the receiving station pre
on single track railroads, it may be preferable to
vents the registration of the uncompleted ele“
provide for the storage of codes at the control
ment.
of?ce so that when several starting buttons are
It may readily occur that an indication code
operated in a rapid sequence the codes will be
will be initiated by a station at the same time
transmitted in order without further attention,
that a control code for a different station is
as in the system of my prior patent. This may
initiated. Normally the control code will take
be accomplished by the provision of a code de
precedence by reason of its short ?rst element,
termining relay CS for each panel, each con
but if due to a fault, the short ?rst element is
trolled as shown in Fig. 3.
not properly transmitted the station transmitter
In this modi?cation the contacts I) to ,f of each
will retain control of the line to deliver a long
starting button are replaced by similarly func
?rst element. If this occurs, the o?ice relay E
tioning contacts of the associated relay CS in the
will pick up in response to the'second impulse
circuits of Fig. 1B, each starting button having
as in the case of a normal indication code, re
only a single contact a. In this modi?cation a
leasing the of?ce relay M by the opening of back 45 storing relay such as OICS is picked up at once
contact h of relay E. Those relays P at the o?ice
in response to the operation of the associated
which were picked up to initiate the code will
button IPB regardless of the condition of the
now release, due either to the dropping of relay
coding apparatus, and is then held energized over
M or to the reversal of polarity of the current 50 the stick circuit extending to terminal B at back
supplied to their stick circuits over wires l8 and
contact 111. of the associated selector relay OIS.
19, when relay E picks up. It follows that the
When wire I‘l becomes energized, contacts I) to f
oi?ce apparatus will be conditioned at the be»
of the lowest numbered one of the operated re
ginning of the second step to respond to the
lays CS will be eiiective to operate the P relays
received code, that is, to pick up the relay P for 55 as required to pick up the associated selector
any of the steps two to seven in accordance with
relay S and to connect terminal B to wire 28
the code as received.
It may also happen that two or more starting
buttons are operated at the same time. The
to initiate the code as described in connection
are so arranged, however, that irrespective of
the number of sets operated, only one set of code
determining contacts is effective to determine
is picked up and its contact m inserts back con
with the circuits of Fig. 13, as will be readily
apparent. In response to the operation of relays
code determining contacts controlled by the
60
P3
to P6 by relay OlCS for example, relay OIS
starting buttons and connected to wires 72-46
the code and no interference occurs, due to the
provision of novel circuit arrangements as will
now be explained.
By reference to the drawings it will be seen
that each odd-numbered button PB has a front
contact e for energizing wire 15, and that wire 16
must be deenergized to set up the combination
for any even-numbered button. Each of the lat
ter has a back contact e in the connection to
wire '58 which opens when the button is oper
tact a of relay IS in the stick circuit for relay
OICS as shown in Fig. 3, whereby the circuit is
opened to release relay OICS in response to the
65 transmission of the sixteenth impulse of the cor
responding control code, to allow the next ener
gized relay CS in order to initiate the next code
to be transmitted.
A contact 7‘ of the associated delivery relay 0 ID
70 provides a connection to terminal B which serves
to prevent the release of relay OICS by relays
OIS and I6 at the end of an indicationcode, in the
event that the starting button IPB is operated
and relay OICS picked up, during the reception
ated, to prevent the energization of wire 16 by
'
operation of any higher-numbered button. Sim 75 of an indication code.
2,409,696
21
' ‘Referring now to ‘Fig. 23, it has ‘already been
explained that this view together with Fig. 2A
shows an arrangement suitable for use at a ?eld
location having a limited number of controlled
devices within the capacity of a single o?lce con
trol panel such as the one shown in Fig. 13, these
devices ‘being those required for the control of a
singletrack switch IW, and a group of signals LH
and RH, located atone end of a passing siding on
a single track railroad, as indicated by the track
plan shown. Suitable circuits for the safety con
trol of such devices are well known, one arrange
ment being shown, for example, in my prior pat
ent hereinbefore referred to, and accordingly
these circuits are shown herein only in diagram
matic form, to indicate how a typical group of
tra?ic governing devices may be controlled by
22
relays, comprising a change relay ‘ICH, a storing
relay ICS, and a. station sequence relay SS, as will
now be described.
It has already been explained that an indica
tion code is initiated by picking up relay ICS to
connect wire I 1 to wire l5, and that relay lCS
may be picked up by manual control by trans
mitting a control code to station No. '1. An indi
cation code is also initiated automatically, in re—
sponse to a change ‘in position of any of the in
dicating relays which control the character of
steps seven to ?fteen of the code. In the speci?c '
arrangement shown, a relay R1 controls the char
acter of the seventh element, the eighth and tenth
elements are controlled in accordance with the
positions of contacts d of switch indication relays
NWP and RWP, and the signal relays LHR and
RHR similarly control the ninth and eleventh
elements. The track relay TR for the detector
code by means of stick polar relays. Wires 464-55
leading to the coding unit of Fig. 2A provide cir
cuits for the control of eight stick polar control 20
track section including switch IW‘ controls the
relays, of which but three are required for the
character of the twelfth element by the operation
simple layout shown, namely, the switch control
of a storing relay TS.
relay WS which governs the operation of the
Relay ICH, as shown, is normally held ener~
switch machine ISM, and the signal control re
gized over a stick circuit extending from terminal
lays LHS and RHS which govern the signal re~
25 B at contact b of relay RHR over contacts b of
lays Llm and RHR, to clear the signals for the
the indicating relays mentioned, and the front
desired direction of trai?c movement and for
contact a and winding of relay ICH to terminal
putting the signals manually to stop.
C.
Relay iCH is released in response to» a change
It has also been explained that the apparatus
in position of any of these relays to extend the
of Fig. 2B is arranged as required at station N o. 1
by connecting wires 22-4‘! to wires 56-59 in
such a manner as to render the counting relays
selectively responsive to the code call set up by
operation of the starting button IPB of Fig. 1B.
It will be apparent that the operation of the
counting relays will be discontinued on one step
or another of any control or indication code con
taining a different code call. More particularly,
the station relay E responds to a short ?rst ele
ment, indicating the oilice as the place of origin,
and relay CR responds only if the second element
is short and elements three to six are long, indi
eating station No. 1 as the intended destination,
and if relay P‘l corresponds in position to the
character of the seventh ‘element as received.
since the station coding unit in this case responds
selectively to only one code call, selector and de
livery relays corresponding to relays OIS and
30 connection from terminal B over its back contact
a. and front contact a of a relay SS through the
lower winding of relay ICS to terminal C. Relay
SS is a slow pick-up relay normally energized
over wire I1 and consequently is released when
the line is in use and becomes reenergized follow
ing the release of relay Ll at the end of a code.
‘ Relay
ICS therefore picks up in response to the
closing of contact a of relay SS, after the line has
been free for a time su?icient to enable relay SS
40 to pick up, and the closing of front contact b of
relay ICS connects terminal B at wire I‘! to wire
IE to pick up relay ST. In Fig. 2A, wire 28 is
connected directly to terminal B, so that relay M
picks up at once to initiate the code. When relay
45 LB picks up in response to the ?rst code impulse,
a circuit is closed from terminal B at front con
tact f of relay LB over back contact a of relay CR
to wire l0 and thence over contact 0 of relay lCS
OlD are not required, the closing of the contacts
through relay I CH to terminal 0, whereby relay
f and g of relays CR and E in the circuits includ 50 ICI-I is picked up to reestablish its stick circuit.
ing wires 46-55 being suiiicient to indicate the
Relay ICS is held energized until the ?nal step
selective response of the coding unit. In‘other
of the indication code is transmitted, over a stick
respects the circuits for controlling the stick polar
circuit'including its contact a and wire 20, ex
relays such as WS are similar to those for the in
tending to terminal B at‘ back contact a of relay
dication relays K of Fig. 13, as will be readily "
55 l6, and thus maintains the coding unit in condi
apparent.
,
tion to initiate an indication code repeatedly, if
Although the apparatus of Fig. 2B is arranged
necessary, until such code is transmitted ‘in its
speci?cally for use at only one location, namely, \ entirety.
at station No. 1, it will be readily apparent that
Relay CR disconnects terminal B from wire ID
similar arrangements may be provided at each
on the eighth step, consequently a change in the
other location for which nine controls or indi 60 position of any of the indicating relays occurring
cations suii'ice, and at each such location one ‘or
after relay CR picks up is eifective to release relay
more of the wires 23 to 25 will be connected to
ICE to effect the transmission of a second code.
wire 56 or 57 instead of to wire 58 or 59,'the con
An indication code follows each control code
nections at each such location being arranged in ‘
received
by the station, even though the control
a distinctive pattern to render the counting relays
code causes no change in the position of any of
selectively responsive to the code call set up by the
the indicating relays, for the reason that during
corresponding one of the starting buttons PB.
each
contro1 code received, the delivery wire 9
Furthermore; the connections of wires 33‘to 36
is connected to terminal B as already explained,
by which relay T is controlled will be arranged at ‘
each station in a pattern corresponding to the 0 and as will be clear from Fig. 2B, relay ICS is
thereby energized over its upper winding to estab~
connections for the counting relays at that sta~
lish the stick circuit including its lower winding.
At the end of a control code, ‘wire 9 remains con
tion.
‘
.
'
The initiation of indication codes by the ap
paratus of Fig.2B is governedby a group of three ‘
nected to terminal B until after relay It releases‘
to reestablish the connection to terminal B at
2,409,696
23
wire 20, consequently relay ICS remains picked
up.
Relay TS provides means for insuring the trans
mission of an indication of the occupancy of the
track section controlling relay TR, even though
the section is vacated before the indication is
transmitted. Relay TS picks up in response to
the release of relay TR and if relay TR then picks
up again, relay TS is held energized over a stick
24
The circuits for operating the stick polar relays
such as relay 5W8 di?er from those of Fig 2B
in that they are selected over contacts of the
associated delivery relay 5D, and they are conse
quently similar'to those for the indication relays
K of Fig’. 1B, already described.
The step-by-step operation of the apparatus of
Figs. 2A and 20 in response to a control code
transmitted to station No. 5, for example, will
be described.
circuit including back contact b of relay [CI-I 10 now
Assuming the system to be in its normal at rest
condition, the operation of the office starting but
ton
5PB picks up relays P2, P4 and P5 of Fig. 1B,
mission of the corresponding “track occupied”
energizing relay ST of Fig, 1A to pick up relay
code, provided relay TR is then energized. When
05S, thereby connecting terminal B to wire 28 to
relay ITS releases, its contact ‘b operates to re
pick up relay M of the office coding unit to initiate
lease relay iCH to effect the transmission of a
the code, which differs from the one already de
"track clear” code.
scribed in detail, by having a short fourth step.
In installations having a large number of sta
It is to be understood that the coding unit for
tions and controlling heavy trailic it may happen
stations 5 to 8 is the only one responsive to codes
that the number of changes occurring is suffi 20 having
a long third step and a short fourth step
cient to keep the apparatus in continuous opera
and consequently the only one at which relay 5
tion for considerable periods of time, resulting in
picks up. Relay E, Fig. 2A picks up in response
undue delay in the delivery of codes from inferior
to the short ?rst step and prepares a circuit closed
stations if the stations are given access to the line
when relay Ll releases on the long fourth step,
in a given order of code superiority as described. 25 over wire 65, to pick up relay P5, Fig. 2C, Relay
Relay SS provides means for preventing undue
Ll reverses relay KS1, and the closing of front
delay under this condition. Assuming for ex
contact I) of relay P5 connects wire 25 to wire 59
ample, that several stations initiate codes at the
extending to terminal C at the reverse contact I)
same time, it will be evident that the codes will
of relay KSI so that relay 6 of the station coding
be transmitted in a ?xed order“ each relay CS 30 unit picks up in'unison with the office relay 6,
which picks up at the beginning of the series of
which is energized over a similar circuit. In a
codes being released at the end of its code, until
similar manner, relay P6 of Fig, 2C is picked up
all are released. When wire I‘! becomes energized
on the sixth step to prepare a circuit for relay 1.
at the end of each code, a relay ST will be picked
At the o?ice and at the location of stations Nos.
up to initiate the next code before relay SS
5 to 8, relay I picks up on step seven, and then on
has had time to close its contact a. Consequently
step eight, relays 8 and CR pick up, and at the
until relay ICS picks up, and then over front con
- tact d of relay lCH, releasing after the trans
no additional relays CS can be picked up.
In
other words, each station unit is allowed to trans
mit only one code if some other station has a
code stored for transmission, for the reason that
its relay CS cannot be picked up in response to a
change in station conditions unless the line has
been free for an interva1 somewhat longer than
?eld location terminal B is connected to wires 21
and 9 to pick up relays 5S and 5D, in turn, and
to operate relay MCR in accordance with the
40
character of step seven. The closing of contact a
of relay 5D completes a circuit from terminal B
through the lower winding of relay 50S to ter
minal C, so that relay 50S picks up. The closing
of contacts I), c and e of relay 5D connects relays
5WS, 5LHS and 5RHS to the wires 48, 49 and 5|
leading to the coding unit to prepare circuits for
operating these relays in accordance with the
character of steps eight, nine and eleven, re
50 spectively, as already described. When the
the normal interval between successive codes.
Referring now to Fig. 20, this view together
with Fig. 2A shows the apparatus required at a
?eld location at which the number of controlled
devices exceeds the capacity of a single o?ice
panel, as for example, would be the case in the
control of a remotely controlled interlocking as
indicated by the track plan in Fig. 11 or my prior ‘ ' sixteenth step is reached, the apparatus restores
to normal in the usual manner, but relay 5CH
patent. In Fig. 20 as shown, it is assumed that
remains picked up over a stick circuit extending
the location includes four groups of devices each
from terminal B at back contact is of relay 58
similar to that of Fig. 2B, comprising stations Nos.
5 to 8, inclusive, of which only station No. 5 is .55 over its own front contact a and lower winding to
' terminal C.
shown.
If button 8 PB had been operated in place of
The code combination required for each of the
button 5PB, for example, steps ?ve and six of the
different stations may be readily ascertained from
code would have been short steps and relays P5
the connections of the starting button contacts as '
shown in Fig. 1B. In View of the description of 60 and P6 would have remained released, resulting
in the operation of a selector relay 8S and the
that view and of Fig. 23 already given, it will be '
corresponding delivery relay 8D, not shown, to
readily apparent that the apparatus of Fig. 2C
deliver the code to station No. 8. If, however,
is connected to respond to the code calls set up
due to a fault, relay P5 or P6 at the station fails
by the operation of buttons 5P to 8P, in which
step three is long and step four short. These ‘65 to pick up on the corresponding long steps of a
code for station No. 5, relay 8S is not operated
code calls differ one from another only in respect ‘
for the reason that in that case the station count
to steps ?ve and six, and the two relays P5'and
ing relay 6 or I will not be operated.
P6 provide circuits for the selection of four relays
The transmission of indication codes by the
58 to 88 similar to the correspondingly numbered
70 apparatus of Fig. 2C is effected by the provision
selector relays 05S to 08$ of Fig. 1B.
of a pair of relays such as the relays 50H and 50$
With the apparatus of Fig. 2C in the receiving
for each group of devices, together with a single
condition it is clear that any one of the four codes
relay SS, which relays function like the corre
to which it is adapted to respond will su?ice for
the operation of the maintainer’s call signal MC,
accordingly this feature is arranged as in Fig, 23. I 75
sponding relays of Fig. 2B.
In Fig. 20 each relay CS is provided with addi
25
2,409,696
tional contacts for operating the station pilot re
lays P over circuits similar to those controlled by
the starting buttons PB in Fig. 1B, in other words,
' energized communication circuit comprising two
line‘ wires, a‘ plurality of line relays of the stick
polar type each arranged to be held locally in its
they function as described in connection with re
~ normal or reverse position when deenergized and
lay OICS of Fig. 3, except that the check circuit
including wire 28 is omitted. It follows that if
having a winding connected across the line wires,
one such relay being located at the of?ce and one
at each station, ‘a plurality of code transmitters
relay 503 is picked up, the release of relay Ll at
the end of the control code described completes
including one at the oflice and one at eachista~
tion each effective when initiated to deliver to the
line wires a code of‘impulses of alternately op
a circuit from terminal B at wire I‘! over contacts
02 and 'e of relay 5C8, wires 15 and 16 through
relays P5 and P6 to terminal 0 so‘ that relays P5
and P6 pick up, extending the connection of ter
minal B over their contacts 0 to wire l5 to pick
posits polarity characterized by the relative
lengths of the time intervals between successive
impulses, each impulse acting to operate said line
up the station starting relay ST, which inturn
picks up relays 5S and M to initiate an indication
relays in unison to normal or reverse, code re
15 sponsive means controlled by each line relay in
code in which steps one, ?ve and siX are long and 7
steps two and four are short, to select the otlic'e .
accordance with the characteriof said codes, and
means‘ controlled locally by each line relay for
panel for station No. 5, and in which steps seven
restoring such relay to its normal position in the
to ?fteen are controlled by a group of indicating
event the relay remains reversed for a prede
relays selected by relay 58. It will be clear that 20 termined time interval which is longer than any
in Fig. 2C, the connections from wire I‘! to wires
of the time intervals in- said code.
75 and ‘H3 are so arranged that if the relays 508
to 8C5 are all energized at the same time, the
corresponding codes will be‘transmi‘tted one at a
2. In a remote control system, an mice‘ and one
or more stations connected by a normally de
_ energized communication circuit comprising two
time in order without interference. Relay SS, in - ‘line wires, a plurality of line relays of the stick
Fig. 2C controls the connection to terminal 0 for
polar type each arranged to be held locally in its
the upper winding of each of the relays 5C8 to
normal or reverse position when deenergized and
BCS, and functions as described in connection
having a winding connected‘ across the line wires,
with Fig. 23, so that codes for indicating changes
one such relay being located at the o?ice and one
occurring after the relays CS have been picked up 30 at each station, a plurality of code transmitters‘
will be stored by the relays CH and the corre~
including one at the crime and one at each station‘
spending relays CS cannot be reenergized until
each including an impulse transformer normally ‘
each of the relays CH energized at the beginning
of the series has transmitted its code.
In the event the office and one or more stations
initiate codes at the same time, the transmission
of the second impulse by the o?ic'e transmitter to
make the ?rst step short will open the stick circuit
for each ?eld station relay M, if closed, and will
also pick up relay E at each ?eld location, and’
at each location such as that of Fig. 2C at which
one or more relays P have been picked up, these
relays will be released due to the reversal of the
polarity of the current supplied to their stick
circuits as already explained in connection with
the similar relays of Fig. 13. Consequently only’
the o?ice transmitter remains in operation and
the apparatus at each station is in proper condition to respond to a control code containing the
disconnected from the‘line wires, and a master
relay, means controlled by each master‘ relay
when energized for connecting the associated im
pulse transformer across the line‘ wires and for
periodically‘ energizing said transformer to ‘de
liver to the line wires a code of impulses of alter=
nately opposite polarity characterized by the time
spacing of successive impulses, each impulse act'
ing to operate the line relays in unison to normal
or reverse, code responsive means controlled by
each line relay in accordance with the time spac-v
ing of said impulses, and means controlled by
each line relay acting to automatically‘ restore
the relay to its normal‘ position if it is operated
to its reverse position by an impulse which is not
followed by other impulses to constitute a code.
3. In a remote control system, an oi?ce and
corresponding station code call. In Fig. 20, the 50 one or more stations connected by a normally de
energized communication circuit comprising two
selecting relay 8S similar to relay 58 shown, but
line‘ Wires, a plurality of line relays of the stick
this relay will not be operated unless the corre
polar type each arranged to ‘he ‘held locally in
sponding code call is received so as to enable the‘
its normal or reverse position when deenergized
counting relays to respond to the ?rst eight im 55 and having a winding connected across said line
pulses of the code.
'
Wires, one such relay being located at the of?ce
release of the P relays prepares a circuit for a
'
In view of the similarity of Fig. 2C to Fig. 1B, _
it will be readily apparent that additional relays
~P controlled over one or more of the steps two to
seven of the code may be provided to expand the
capacity to eight, sixteen, thirty-two, or‘ sixty~
four stations, at the same ?eld location, and that
any of the code calls not used at a given location
may be used at other locations.
Although. I have herein shown and described
only one form of remote control apparatus en -
bodying my invention and several‘ modi?cations
and one at each station; a
transmitters including one at
at each station each effective
deliver to the line Wires‘ a
plurality of code
the of?ce and one
when initiated to
series of induc
tively generated impulses of alternately op
posite polarity each’ impulse ‘acting to operate
the line relays in unison to normal or reverse,
said codes being characterized by pausesgfollow
ing certain‘ of the impulses during which the‘ line
relays are held locally in their last operated posi
tions, code‘ responsive means controlled by each
thereof, it is understood that various changes and
line
relay in accordance with the character‘ of
modi?cations may be made therein within the
codes, and means‘ controlled by each relay
scope of the appended claims without‘ departing 70 said
acting to automatically restore the relay to its
from ‘the spirit and scope of my invention.
normal position if it is‘operated to a reverse posi-v
Having thus described my invention, what‘ I
tion by an impulse which is not followed by other
claim is:
impulses to constitute a code.
1, In aremote control system, an oi?ce and one
4'. In a remote control system,‘ an oi?ce and
or more stations connected by a normally de 75
agstation connected by two line wires, ,a‘line; re
2,409,696
27
lay of the stick polar type connected across said
line wires at the o?ice and also at said station,
a code transmitter at the oiiice and at the station
28
line relay associated therewith is operated by an
impulse delivered by another transmitter during
a pause in the operation of said associated trans
mitter.
'7. In a remote control system, a plurality of sta
line wires a series of inductively generated im
tions connected by two line wires, a two position
pulses of alternately opposite polarity to operate
polarized line relay having access to said line
the line relays, said codes being characterized by
wires at each station, a code transmitter at each
pauses following certain of the impulses during
station having a contact operable to normal and
which the line relays are held locally in their
reverse positions to deliver codes of impulses of
10
last operated positions, and means for discon
alternately opposite polarity to said line wires to
tinuing the delivery of impulses by each code
operate the line relays to normal and reverse
each effective when initiated to deliver to the '
transmitter during any pause in its operation
when transmitting a code if the associated line
relay is operated during said pause by an im
pulse received from said line wires.
5. In a remote control system, an office and a
station connected by a normally deenergized com
munication circuit comprising two line wires, a
line relay of the stick polar type at the office and
at said station each arranged to be held locally
in its normal or reverse position when deenergized
and having a winding deriving its energization
from impulses delivered at times to said line
wires, a code transmitter at the office for deliver
ing impulses to said line wires to momentarily~
energize said line relays, means at the o?ce for
actuating said code transmitter periodically to
deliver to the line wires a series of impulses of
positions, the codes being characterized by pauses
between selected impulses during which the line
relays are deenergized, means associated with
each line relay for maintaining it in the position
to which it is operated by each impulse, until the
next impulse is received, and interference pre
venting means controlled by each line relay and
by the associated transmitter relay comprising a
circuit which is closed either over their normal
contacts or over their reverse contacts as long
as the line relay responds to the code operation
of such transmitter relay but which is opened
when the line relay is operated by an impulse re
ceived during a pause in the operation of the as
sociated transmitter relay, the opening of said
circuit being effective to discontinue the operation
of said transmitter relay.
alternately opposite polarity, stepping means con
8. In a remote control system, two coding units
trolled by the oi?ce line relay for counting 3O each including a receiver selectively responsive to
the impulses and for controlling said code trans
multiple element codes including selecting ele
mitter, thereby interposing pauses following cer
ments and a transmitter controlled by the associ
tain of the impulses during which the line relays
ated receiver for transmitting such codes, a plural
are held locally in their last operated positions,
ity of pilot relays in each coding unit including
code responsive means comprising stepping means 35
one for each selecting element of a code, a plural
controlled by the station line relay to count the
ity of selecting relays in each coding unit includ
impulses, and means selected by said stepping
ing one for each different combination of said se
means which is selectively controlled in accord
lecting elements in a code, energizing circuits for
ance with the time spacing of the impulses.
said selector relays including contacts of said pilot
6. In a remote control system, a plurality of 40
relays, there being one such circuit for each differ
stations connected by a normally deenergized
ent arrangement of said pilot relays in their
communication circuit comprising two line wires,
operated or released positions, a ?rst relay in
an impulse transformer normally disconnected
each coding unit selectively responsive to a ?rst
from the line wires effective when operated to re
verse and normal positions to supply impulses of 45 element in a code provided such element is of a
particular character identifying the code as one
reverse and normal polarity to the associated im
transmitted by the other coding unit, means rend
pulse transformer, located at each station, a stick
ered effective when said ?rst relay is energized for
relay at each station effective when energized to
energizing each pilot relay of the associated coding
connect the associated impulse transformer to the
line wires and to operate the associated trans 50 unit or not depending upon the character of the
corresponding selecting element being received,
mitter relay repeatedly to reverse and normal
and for then energizing that selector ‘relay the
positions to deliver a code of impulses of alter
circuit for which includes a closed contact of each
nately opposite polarity through such impulse
pilot relay, means in each coding unit effective
transformer to the line wires, each such code be
ing characterized by pauses following certain of 55 only when such coding unit is in a normal
at rest condition for operating the pilot relays
the impulses, a line relay at each station of the
as required to prepare the circuit for a parti
stick polar type operable to reverse and normal
cular selector relay of such unit and for then
positions in response to such impulses, means for
energizing such selector relay, and means
holding each line relay locally in its last operated
normal or reverse position during said pauses, 60 controlled by the operated selector relay for
setting the associated transmitter into operation
starting means for each stick relay effective only
to transmit a code having a ?rst element to which
when said communication circuit is in its normally
said ?rst relay of the other coding unit is respon
deenergized condition for picking up such stick re
sive, and selecting elements of which the char
lay to set the associated transmitter relay into
operation to deliver its code, and lockout means Ci 9"' acter is determined by the positions of said pilot
relays to thereby energize the corresponding pilot
effective in the event a plurality of said trans
relays and selector relay of the other coding
mitter relays are set into operation at the same
unit.
time to discontinue the operation of all but one,
9. In a remote control system, an of?ce and a
comprising a holding circuit for each stick relay
plurality of stations connected by a normally
including its own front contact and contacts of
deenergized communication circuit comprising
the associated line and transmitter relays by
two line wires, a code transmitter at the office
which one stick relay is held energized for the
and at each station, each comprising an impulse
duration of its code, and each other stick relay is
transformer normally disconnected from the line
released to terminate the delivery of impulses
Wires and a transmitter relay effective when
75
by the associated transmitter in the event the
29
2,409,696
operated to reverse and normal positions to sup
ply impulses of normal and reverse polarity there
to, a plurality of stick relays including one at
the o?ice and one at each station each serving as
a master relay which when energized connects Cl
30
said receiving means is responsive, circuits con
trolled by said master relay for maintaining the
energized pilot relays and said selector relay
the associated impulse transformer to the line
wires and operates the associated transmitter
relay repeatedly to reverse and normal positions
to deliver a code of impulses of alternately oppo
site polarity through'the transformer to the line 10
wires, each such code being characterized by
pauses following certain of the impulses, a plural
ity of line relays of the stick polar type including
one at the oilice and one at each station, each
picked up until the end of such code, and means
controlled by said receiving means for governing
the character of the selecting elements in the
transmitted code in accordance with the positions
of said pilot relays and for governing the char
acter of said additional element in accordance
with the position of a movable device selected by
the energized selector relay.
11. In a remote control system, a coding unit
for transmitting and receiving codes each of
which includes a group of selecting elements ar
responsive to the codes supplied to said communi 15 ranged in different patterns in different codes, a
cation circuit, means associated with each such
group of pilot relays in said unit including one
relay for restoring it to its normal position when
for each selecting element, which assume ener
said communication circuit is in its normal de
gized or released positions in distinctive combina
energized condition and for holding it in its last
tions to register the code patterns, two circuits
operated position during each pause in a code, a 20 for energizing each pilot relay, means effective
pick-up circuit for each master relay including
when a code is being received by said coding
contacts ‘closed only when no code is being de
unit for completing one circuit for each pilot re
livered to said communication circuit, and a
lay the energization of which is required to regis
stick circuit for each master relay which includes
ter the code pattern being received, such relays
its own front contact and which has two branches
one of which is closed only when the associated
transmitter and line relays are both in their nor
mal positions and the other only when these
relays are ‘both in their reverse positions, so
arranged that each master relay is held energized
for the duration of the code delivered by the asso
ciated transmitter but only if the associated line
relay is not operated by an impulse delivered by
being thereby energized one at a time as the
selecting, elements are received, starting means
for each different code for initiating the trans
mission of a code by said coding unit, each effec
tive if operated when no code is being received by
said unit to complete the other circuit for each
pilot relay the energization of which is required
to set up the code pattern identifying the oper
ated starting means, and means for controlling
another transmitter during a pause in such code.
10. In a remote control system, a coding unit
for controlling selected devices at the same or at
a distant location by distinctive codes, each of
which includes a group of selecting elements and
an additional element, each of one character or
the character of each selecting element in the
transmitted code in accordance with the position
each in response to a corresponding element of
said one character in the received code, stick cir
I relay is required for the corresponding code
cuits controlled by the receiving means for hold
ing each energized pilot relay picked up until the
when said coding unit is in a normal inactive
of the corresponding pilot relay.
12. In a remote control system, a coding unit
for transmitting and receiving codes each of
which includes a ?rst element of distinctive char
another, the selecting elements being arranged 40 acter and a group of selecting elements arranged
in diiferent patterns to select diiferent devices,
in different patterns in different codes, a group of
said coding unit comprising a series of pilot
pilot relays in said unit, including one for each
relays including one for each selecting element, a
selecting element, which assume energized 'or
plurality of selector relays including one for each
released positions in distinctive combinations
controlled device, a master relay, and code re
to register the code patterns, starting means
ceiving and transmitting means; means respon
for selecting the diiferent code patterns for
sive to the operation of said receiving means when
transmission each including means for ener
said transmitting means is idle for selectively
gizing each pilot relay by current of a
energizing said pilot relays only one at a time
given polarity if the energization of , such
end of such code, a circuit including contacts of
all of the pilot relays closed after the last selecting
element is received for energizing the selector re
lay for the code pattern indicated by the positions
of said pilot relays, means controlled by said
selector relay for controlling the corresponding
pattern, said starting means being effective only
‘condition, means for energizing said pilot relays
one at a time by current of the opposite polarity
each in response to a different selecting element
of a given character in a received code to register
the code pattern of such code, a stick circuit for
each pilot relay closed when such relay is picked
up and supplied with current of the proper po
device in accordance with the character of the Cl) larity to maintain such relay picked up until the
additional element in such code, a plurality of
end of the corresponding code, and means con
locally controlled contact sets including one for
trolled by the ?rst element of a code received
each di?erent code pattern each effective if oper
when one or more of said pilot relays have been
ated when said receiving means is idle to selec
picked up to transmit a code having a given pat
tively energize said pilot relays as required to
form the corresponding code pattern and to com
plete circuits for the selector relay for such code
pattern and for said master relay, means con
trolled ‘by said master relay when energized for
initiating the operation of said transmitting
means to deliver a code to the line circuit to which '
tern, for reversing the polarity of the current sup
plied to their stick circuits whereby such‘ relays
‘ are released and placed in condition to be re
energized in accordance with a different code
pattern.
‘ LLOYD V. LEWIS.
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