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Патент USA US2411375

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Nov. 19, 1946.
2,411,375
A‘ P. JACKEL
REMOTE CONTROL SYS_TEM
Filedv'July 31, 1943
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Nov. 19, 1946.
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REMOTE CONTROL SYSTEM
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BY a?wlll'we?
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Patented Nov. 19, 1946
2,411,375
UNITED STATES PATENT OFFICE
2,411,375
REMOTE CONTROL SYSTEM
Arthur P. Jackel, Penn Township, Allegheny
County, Pa., assignor to The Union Switch &
Signal Company, Swissvale, Pa., a corporation
of Pennsylvania
Application July 31, 1943, Serial No. 496,907
16 Claims.
1
My invention relates to remote control systems,
(Ci. 177-353)
2
of a series of register relays, one for each ele
ment, as used heretofore.
Another feature of my invention relates to im
and more particularly to centralized traffic con
trol systems for railroads comprising an oi?ce
and a plurality of stations connected by line wires
proved arrangements for associating additional
over which impulse code signals are transmitted Cl station storage units with the same coding unit,
to effect the operation of tra?ic governing de
reducing the number of relays required when the
vices located along the trackway, and to indi
number of controlled devices at a location is
cats the condition of such devices at the o?ice.
larger than can be controlled and indicated by a
The system of my invention is of the time code
single composite code. A limited number of
typaemploying codes of long and short elements 10 storage units may be connected directly to the
which are transmitted one at a time over a single
station coding unit, as heretofore, and in addi
line circuit, and is based upon the system shown
tion, auxiliary groups of selecting relays, desig
in Letters Patent of the “ United States No.
‘ nated 1“pyramid” units, may be interposed to af
2,229,249, granted January 21, 1941, to L. V. Lewis,
ford connections for additional storage units,
for Remote control systems. My system includes 15 only one station coding unit being required at a
also certain improvements upon the system of
this patent relating to the use of a central bat
tery line circuit of the bridged type ?rst shown
in Letters Patent of ‘the United States, No.
location even though the number of controlled
devices is su?icient to absorb the entire capacity
of the system.
'
Another feature of my invention comprises the
2,303,875, granted December 1, 1942, to G. W. 20 provision
of a starting relay of the normally ener
Baughman and N. F. Agnew, for Remote control
giz‘ed type in each station storage unit which
‘systems in order to permit the joint use of the
takes the place of two relays as required hereto
same line wires by the centralized traf?c control
fore, and is also more e?‘lcient in operation.
system and by other communication facilities.
» 'Iviy invention as arranged for the indication of
Certain features of my invention disclosed‘but
train movements includes an improved “track OS
not claimed herein, are claimed in my divisional
storage” feature‘ for insuring the transmission of
applications, Serial No. 554,199, ?led September
an indication of a train movement through a
15, 1944, for Selective receiver for remote control
particular track section even though the line cir
systems, now Patent No. 2,381,499, issued August
7, 1945, and Serial No. 554,200, ?led September 30 cuit is not available when the train movement
takes place.
15, 1944, for Transmitting apparatus for remote
control systems, now Patent 2,393,377, issued Jan.
22, 1946.
The system of my invention also includes nu
merous circuit improvements whereby the timing
of the relays which measure the lengths of the
The components of the system of my invention
code elements is more accurately controlled, as
are preferably assembled in the form of coding
will hereinafter be pointed out, thereby increas
and storage units each containing a group of re
ing the margin of reliability of the system, and
lays. The system employs a station coding unit
causing it to function properly through a wider
at each ?eld location for transmitting indication
range of variation of local battery voltage.
codes and for selectively receiving control codes,
together with a station storage unit for each unit
> Another'feature of my invention relates to im
proved arrangements for e?ecting joint opera
group of controlled tra?ic governing devices, for
associating such devices with the station coding
tion over a line circuit which is used for the
operation of telephone call selectors, without in
unit. The of?ce equipment preferably includes
terference.
an individual control panel for each unit group
of controlled tra?ic governing devices, and an 45
Another feature of my invention relates to pro
o?ice coding unit which is connected over the
visions at the office for preventing the further
line circuit with the station coding units to es-_
reception of a code containing a manifest error,
tablish communication selectively between each
, such as might occur due to a fault when two sta
panel and the corresponding station storage unit.
tions attempt to transmit different code calls at
One feature of my invention is the provision 50 the same time. a
i
7
of an improved station storage unit requiring
Other features, purposes and objects of my in
fewer relays than heretofore, due to the provi
vention will be pointed out as the description pro
sion of a pair of register relays which are oper
ceeds.
ated alternately and repeatedly to register the
‘One form of apparatus embodying my inven
character of a series of code elements, in place
tion and several modi?cations thereof will now
2,411,375
then be pointed out in claims.
4
are transmitted by opening and closing the line
circuit by operating relay OT periodically. The
circuit also includes back contacts I) and d of
a lockout relay X, provided in accordance with
be described and the novel features thereof will
_
Referring to the accompanying drawings, Figs.
1A, 1B and 1C, taken together, illustrate in con
densed form
oi?ce equipment employed in one
for .’l of centralized tra?ic control system embody
a feature of my invention, and in addition, the
primary windings of an impulse transformer RT,
inventionl The apparatus. :of FigsilA ‘ by means of which ‘the office line relay OR is
controlled-when receiving indication codes, and
comprises the'o?ice coding unit for gen
the normally closed contact of a disconnect but
and delivering control codes to the line
and for receiving indication codes. Fig.1 10D ton DB by means of which the line may be opened
‘.r-nanually. Relay OR is of the stick polar type,
10 shows an individual panel containing :the
as described and claimed in Patent N0. 2,303,875,
levers and lamps for controlling and indicating
a typical unit group of traf?c. governing devices ~~and>responds to impulses of alternately opposite
"polarity delivered by transformer RT when the
in the ?eld, together with the ‘selecting relays
for associating the one‘ panel‘ with"v the of?ce 15' lineicurrentis varied by the operation of a sta
tion transmitter relay T, such as' is shown in
coding unit. It is to be understood that each
2A.! Indication codes are transmitted by
panel is similarly connected but by‘means of
operating relay T to connect the line wires to
a different arrangement of selecting relays.
gether periodically through an impedance of
Figs. 2A, 2B and 2C, taken together,’ illustrate
the corresponding apparatus at a typical ?eld 20 relatively low value iii-comparison with the nor
ing my
and 1B‘
erating
circuit,
. mal impedance of the line circuit, comprising
‘location arranged as required-"when there is but
one unit group of controlled devices at the loca
tion. The apparatus of Figs; 2A'andi2B, together
- with the left-hand portion of Fig. 20, comprises
I the station coding unit, while the right-hand por
the coils of alow pass ?lter LPF'similar to the
vrone at the ‘office, which is interposed ‘between
the-line and the station apparatus.
25
tion ‘of Fig. 2C shows the relays of a station
storage unit suitable for the ‘control of a typical
" At each ?eld station, as shown in Fig. 2A, 2.
~ high resistance line relay R is connected across
the line wires Y. and Z in series with a resistor
WI, the connection normally including back con
‘groupof 'traflic governing devices. Fig. 20 also
tacts band d of a master relay M and the coils
‘includes a .track‘diagram ‘illustrating such a
. group,‘ which as showmincludes a power oper-x 30 of the low pass ?lter LPF. The station line re
~ated track switch and a group of signals such ' ' lays Rare of the biased polar type and are nor
‘mally energized, in parallel, by current supplied
' as: are commonly associated'with one-end of a
by battery 8%, each relayR closing its left-hand
passing siding on a ‘single track railway. It is
‘to be understoodth‘at‘the portion of the coding
contacts a and b, as shown, when its left-hand,
‘ unit‘ shown in'Fig. 2C is arranged to provide con-l. 35 terminal is positive, and closing its right-hand
‘contacts a and bwhen energized. in the reverse
nections‘ for from one to ?ve station storage
‘units, such as the one‘shown.
direction. with its right-hand terminal. positive,
.
or when-deenergized. The connection of the sta
tion apparatus to the line wires‘ Y and Z'is con
trolled by a fault relay RPP in a mannerherein
Fig. 3 illustrates the circuits for the pyramid
‘units hereinbefore referred .to, and replaces the
left-hand portion “of Fig. 2G in the circuit plans;
when connections for additional storage units are
after pointed out, but as this relay is not involved ' '
in the normal operation of the system itmay be
required. v
.. assumed for the present to remain inits normal
Fig. 41 illustrates amodi?-cation of a portion
energized position as shown.
' of the oii’lce coding unit which replaces the upper ~
‘part of‘Fig. 1A in the circuit plans when thersysa ‘ .
I
Each station line relay R. controls a group of
slow release timing relays Ll, L2, LP, LB and
~tem isto use aline circuit over. which telephone
selectors are controlled, this View also-showing
a typicalcodewheel and apparatus for trans
»mitting selector code calls.
LBP. These timing relays are normally deener
gized and are controlled by relay R to govern the
! transmission and reception of codes in accordance
Fig. 5 illustrates another modi?cation of 7 av 50 with line conditions like the similarly designated
relays of‘ Patent No. 2,229,249, hereinbefore re
portion of the of?cecoding unit of Fig. 1A, .com
“prising, a. circuit. for. controlling . a secondary
v
ferred to.
Their release times are likewise gov
erned by electronic recti?ers, as shown, the rec
ti?ers also ‘serving to prevent contact sparking
in the line, ortc meet other special line condi-;. ; - ‘and to minimize contact wear, as explained in
" this'patent.
tions.
The system. of my invention is arranged to
Similar reference characters refer to similar
‘employ codes each having sixteen steps, and in
parts in each of the ‘several views.
each control code delivered by the o?ice trans
Referring to Fig. 1A, the reference characters
Y and Z designate a pair of line wires which 60 mitter relay OT, the line circuit is open during
‘each odd-numbered'step and closed during-‘each
extend from the o?ice through the several sta
. even-numbered step. More particularly, thefoii‘ice
tions and provide a line circuit for the centralized
' coding unit is placed in condition. to transmit a
traf?c control system of my invention and also
control code by energizing the master relay OM
may be used to provide channels for telephone
transmitter relay TS which may be used when the
control of?ce is locatedat an intermediate point
and telegraph communication, as explained ini 65 of Fig. 1A, which completes circuits for eifecting
the periodic operation of the associated trans
connection with the similarly designated line
' wires shown in the Baughman et al. Patent No.
“ mitter relay OT to open and close the line circuit
to‘ operate the line relays R at all stations in
2,303,875. This line circuit, as shown, is nor
unison, both the open and closed periods constit
"mally energized by current from the office line
battery as, the positive terminal of‘ which‘is” 70 ‘tuting code elements.
When the line circuit is opened to ‘begin the
normally connected to line'wire Y and the nega
"first element of a code, each line relay Rreleases
tive terminal to line wire Z over back contacts
"and its right-handrcontact b completes a circuit
I) and d of a pole changer relay PC and of the
from the-positive or sup-ply terminal B of a suit
"office transmitter relay ‘OT and the coils of a
suitable low pass ?lter LPF, and control codes" able local source of current over aback contact
2,411,375
5
6
d of relay I6,;back contact a of relay L2, back
charging current as is desirable when the line is
in a cable. At the same time, relay OT operates
contact g of relay LBP through relay LI to» the
negative or common return terminalC of the
source. Relay LI then picks up and its front con
tact a completes a circuit from terminal B at the
relay OR to reverse over the circuit extending
from the positive terminal B over front contact
e of relay OT through relay OR to terminal 0.
right-hand contact I) of relay R through relay
Each time relay OT releases it closes the line
circuit to pick up the line relays R and at the
same time it operates relay OR to normal 'by com
pleting a stick circuit at its own front contact a
pleting the circuit at its back contact e extending
and also completing a circuit from terminal B
over front contacts 0 of relays L! and L2 to pick 10 from terminal 0- through relay OR to terminal C.
Relay OR thus operates in unison with the relays
up relay LP, which relay in turn completes cir
L2 to terminal C, so that relay L2 picks up, com
R during the transmission of control codes.
Each line relay controls a chain of counting
relays over circuits generally similar to those of
cuits over its front contact a to pick up relays
LB and LBP. Relay LBP becomes energized in
tandem with relay LB when the latter closes its
cessively after relay LP is released. When relay
L2 picks up on the first step of a code, its contacts
Thus relay OR, by means
of its contact a, controls the counting relays OI
to O8 and 018 of Fig, 1B, and each relay R con
a and 9 shift .theccnnections of relay LI from
trols a similar chain such as the relays I to 8
front contact a so that these relays release suc
15 Patent No. 2,229,249.
and I6 of Fig. 23. Referring to Figs. 2A and 2B,
it will be seen that a pick-up circuit for relay 5
R, and then contact g of relay LBP is picked up
is closed momentarily in response to the first of a
to maintain the latter connection until the code
series of operations of relay R, which extends
is terminated. It follows that relays Li and L2
from terminal B at the right-hand contact a of
are energized alternately, relay LI over the left
relay R over back contact e of relay I6, back con~
hand contact I) of relay R, and relay L2 over the
right~hand contact 2) of relay R, in response to 25 tact b of relay LBP, front contact g of relay Ll,
wire IBI through relay I to terminal C. Relay I
the periodic operation of relay R. Relays LI and
therefore picks up on the ?rst step of‘ a code
L2 remain picked up for the duration of short
the right-hand to the left-hand contact I; of relay
code elements, relay LI releasing during each
odd-numbered long element and relay L2 during
each even-numbered long element. These relays
serve, therefore, to indicate code character in a
received code, and together with relay LP they
serve to control the lengths of the long steps of
a code generated by the associated transmitter
relay ‘T. Relay LB and its repeater relay LBP *'
are bridging relays which remain picked up for
upon the energization of relay LI, and when relay
LBP picks‘up, it opens the circuit just traced
and closes a stick circuit for relay I extending
over front contact 17 of relay LBP, wire H9, back
contact b of relay 2, front contact a and winding
of relay 5 to terminal C. When relay R is op
erated to normal to begin the second step of a
code, terminal 13 is disconnected from relay. I,
which remains picked up due to the discharge
the duration of a code and serve to prepare var
path provided by the recti?er connected to wire
ious local circuits when the code operation of
relay R begins and to open them when it ceases.
The oliice line relay OR, Fig. 1A, controls a
H2, and a circuit is closed from the left-hand
contact a of relay R over front contact at of relay
similar group of timing relays OLI, 0L2, OLP,
OLB and OLBP, which function in a similar man
LBP, wire £28, back contact a of relay 8, front
contact I) of relay I through relay 2 to terminal
C. Relay 2 therefore picks up and completes its
stick circuit extending to terminal B at Wire I20
ner. Relay 0R, however, is normally deenergized
over its front contact a and back contact b of
and is adapted to hold its contacts in either posi
tion to‘which it is operated by a momentary im 45 relay 3. The operation of contact I) of relay 2
disconnects relay I from the rectifier but closes
pulse, and hence it may become accidentally
a second discharge path for relay I comprising
reversed. 'If this ‘occurs, relay OR is restored
automatically to normal by the action of the
timing relays in a manner hereinafter explained,
and it may be assumed therefore that relay OR,
although deenergized, occupies its normal posi
tion corresponding to that of the normally ener
gized station line relays R, when the system is
the winding of relay 3, whereby relay I releases
shortly after relay 2 picks up but without spark
ing at its contact a, the dropping of which con»
nects relay 3 to wire H9 to condition that relay
to respond to the third step of the code. Relays
A to it are similarly controlled one at a time by
current supplied alternately over wires H9 and
When receiving indication codes, relay OR is 55 I20 in response to the fourth to ‘eighth steps of
the code. If the various operations associated
operated by impulses of alternately opposite
with these steps as hereinafter described are
polarity delivered by transformer RT. During
properly carried out. a chain repeat relay CR is
the transmission of control codes the master relay
picked up on the eighth step to prepare a pickup
OM, Fig. 1A, is held energized and its contact 0
circuit for relay I over front contact I) of relay
short circuits transformer RT and disconnects
8 so that relay I will operate as the next in order
it from relay OR, and relay OR is then operated
after relay 8, relays I to ‘I being then operated
locally by the transmitter relay OT. When relay
through a second cycle on the ninth to ?fteenth
OM picks up, relay OR becomes energized in the
.teps of the code, relay i6 responding in place
normal direction, as shown, over the circuit from
the mid point terminal 0 of the local battery 65 of relay 8 on the sixteenth step, during which
the apparatus is restored to its normal at rest
through its lower winding, back contact 6 of relay
in its normal at rest condition.
‘
OT and front contact 6 of relay. OM to the nega
condition.
tive terminal C.
From a comparison of these circuits with those
of Patent No. 2,229,249, itwill be seen that a
Relay OT becomes energized
over contact at of relay OM and is then controlled
over wires 68, Stand 62 in a manner hereinafter
explained to generate the code. Each time relay
0T picks up, it opens the line circuit at its con
tacts b, and d to release the line relays R at the
stations and connects line wire Y to wire Z
>
discharge path is provided for each of the relays
I to 8 each including the winding of another re~
lay, which paths are effective on each interme
diate step of the code, whereas in the patent'they
are effective on certain steps‘ and not on others.
through a resistor W5 to discharge the line 75 It ‘follows that the circuits asshown herein pro
2,411,375
7
vide more uniform. and accurate operation of the
counting relays in receiving a code, and since
these relays control the transmitter relay T, the
8.
stepto distinguish it froman indication code in
which the ?rst step is relatively ‘short.
‘ When relay‘ OI picks up on the ?rst step,vits
transmitted impulses are made-more uniform.
back contact .17 opens the pulsing circuit for relay
Referring now to Figs. 1A and 13, it will be 5 OT, but relay OT is held energized to generate a
seen that the o?ice counting chain circuits are
long step over a branch circuit extending from
similar to those above described, relay Ol picking
up on the ?rst step over wire 8!, the remaining
relays being operated one at a time by current
terminal B at front contact 0 of relay OI, back
contact 01 of relay SP, contact e of relay OLI and
contact I) of relay OLP in parallel, back contact
supplied alternately over wires !9 and 2%) in re IO e of relay SP to wire 68, and'thence over contact
sponse to the periodic operation of relay OR.
‘
01 of relay OM and the winding and front con
In Patent No. 2,229,249, the timing relays Li
tact c of relay OT through resistor W3 to termi
and L2 and the counting relays are energized in
nal c. Relays OLI and OLP then release suc
parallel over the same contacts of the line relay,
cessively, the opening of contact I) of relay OLP
in which case the release periods of the timing
disconnecting terminal B from wire 68 causing
relays depends to some extent on whether or not
relay OT to release to energize the line relays R
a counting relay is connected in parallel there
and to operate relay OR to the left to begin the
with to provide a discharge path for a portion of
- second step, relay OR causing relay O2 to pick
its stored energy. This is a variable condition
up and relay OI to release.
in the normal operation of the system, as herein 20'
The closing of back contact g of relay Ol com‘
after pointed out, and the provision of separate
pletes the pulsing circuit for relay OT over wire
contacts a and b for the line relays R and OR
63, this circuit functioning repeatedly to gener
renders the operation of the timing relays more
ate the short steps of the code. The pick-up
uniform and accurate.
time of relay OT depends upon the time constant
I shall now describe the transmission of a con
trol code, step by step, by the oi?ce apparatus
of Figs. 1A, 1B and 1C.
To initiate a control code, ‘the operator momen
tarily presses a starting button STB identifying
the control panel ‘associated. with the station
storage unit to which the code is to be trans
mitted to thereby pick up a starting relay such
as the relay ZMST, which relay is held encr
gized over a stick circuit extending to terminal
13 at the back contact 2' of an associated panel
selector relay such as the relay 2343 until the
desired selection has been eifected. Wire 4?, in
Fig. 1C, is normally connected over back contacts
of various selecting relays E, F and G to branched
' circuits extending to contact b of the starting ‘
relay ST of each panel. The closing of front con
.tact b of relay 234ST'therefore extends the con
nection of terminal B over a particular branch,
which as shown, includes back contact a‘ of relay
234s, and back contacts 9 of relays 23G, 2F and
E to wire 41, and if the system is in its normal
at rest condition so that relays OLI and 0L2
are released, a circuit is completed from terminal
I B at wire 41 over the back contacts b of relays
0L! and 0L2 through relay OM to wire I? and
then. to terminal C at the normally closed con
tact of the cancelling button CB. Relay OM
therefore picks up in response to the operation of
any startingirelay such as ZMST and completes
a pulsing circuit for the o?ice transmitter relay
OT extending from terminal B at back contact
e of relay Ole over back contacts a of relays O1,
O5, O3 and 0!, wire 68, contact d of relay OM
through relay OT and. resistors W2 and W3 to
terminal C. Relay OT therefore picks up to be
gin the ?rst step of the code, its front contacts
b and d opening the line circuit to release the
station line relays and its front contact e com
pleting a circuit already traced for operating re
lay OR to its reverse position, whereupon relay
OR operates the timing relays 0L and the ?rst
counting relay‘ OI as already described. When
relay OLB picks up, its‘contact c completes a
stick, circuit for relay OM extending from ter
minal B at back contact 2 of relay OlS, wire I8,
contacts 0 of relays OLB and OLBP, in parallel,
contact a and winding of relay OM, and thence
over wire I’! to terminal 0.
The ?rst step of each control code is a long 75
7 of the circuit including its winding and resistors '
W2 and W3. ' When relay OT picks up, its front
contact 0 short circuits resistor W2 so that the
energization of relay OT rises‘ quickly to a higher
value than would otherwise be the case, and con
sequently providing a more constant release peri
od under conditions of variable voltage. Its re
lease period, it will be noted, is determined by
1e time constant of the circuit including its
winding and resistor W3 only, and it follows that
its pick~up andrelease periods may be adjusted
independently.
Wires 6| and 62 provide connections, described
hereinafter in detail, for holding relay OT picked ’ 7
up or released to generate the long steps of the
code‘. The connection-from terminal B to wire
M is controlled by relays OLI and OLP so as
to hold relay OT picked up after its pulsing cir
cuit opens, to generate a, long odd-numbered step,
while a similar connection controlled by relays
. 0L2 and OLP extending from terminal B over
wire 62 and front contact f of relay OM and
back contact 0 of relay OT to the left-hand ter
minal of relay OT is effective to short circuit its
winding and thereby hold relay OT released
after its pulsing circuit closes, to generate along
even-numbered step.
'
The second to eighth steps of each code may
be arranged in any one of thirty-?ve different
combinations of three long and four short steps
to form station code calls, which are identi?ed
by three-digit numbers in which the digits rep
resent the long steps of‘ the code call. Thus
the number 235, assigned to the individual panel
of Fig; 1C and the corresponding station‘ storage
unit of Fig. 2C, is one in which the second, third
and fourth steps of the code are long, ‘and the
?fth to eighth steps are short. The code calls
are generated by completing connections from‘
terminal B at contacts b of the office starting
relays ST, to wires 6! and 62, these being ar
ranged so that when a plurality'of starting relays
are energized, their respective codes will be trans
mitted one at a time in a‘ given order of code
superiority, a long element taking precedence
over a short one on each step._ That is to say,
234 is the most superior code call, 235 the next,
and so on, 678 beingthe most inferior. The se
lection of the of?ce panel containing an ener
gized relay ST is effected by the energization of
an entry relay E, Fig.- 1C, in response to the ?rst
2,411,375
element of the code, followed by the energization
of three relays in sequence by the three long ele
ments of the code call, comprising a ?rst selector
relay F, a group selector relay G, and a station
10
cuits for generating code calls in which the ?rst
digit is 3, 4, 5 or 6.
Each of the relays E, F and G, and certain other
relays hereinafter described, are provided with
selector relay S, these relays being identi?ed more
a discharge circuit including a resistor in lieu. of
particularly by pre?xes designating the code ele
the usual recti?er. These resistors are of a rela
ments by which their operation is effected. For
tively high value in comparison with the resistance
example, relay 2F is responsive to the second ele
of the relay winding, and provide a slight degree
ment, relay 23G to the third, provided relay 2F
of retardation in accordance with the circuit re
has been operated, and relay 234s to the fourth, 10 quirements, and also serve to prevent contact
provided relay 23G has been operated. When
sparking.
used to capacity the system will employ ?ve F
When relay 03 picks up, the connection from
relays, ?fteen G relays and 35 S relays, arranged
terminal B over wire 33 is extended over contact
generally as shown in Figs. 2, 3 and 4 of Patent
0 of relay O3 and back contact e of relay OCR to
No. 2,229,249 and since the relation of these re
wire 5! to complete the stick circuit for relay O'I‘
lays one to another and the connections for as
to generate the long third step of the code call
sociating the different panels with the coding
234.
unit may be ascertained from the patent, for sim
plicity I have shown the circuits hereinv in con
a circuit from terminal B at wire Bil over back
densed form, showing the circuits in detail for
only one panel and for only one selecting relay
of each kind.
Relay E is picked up on the first step of each
code, over a circuit extending from terminal B at
Relays OLI and OLP release, completing
contact a of relay OCR, wire 53, back contact (2
of relays OLP and OLI to wire 63, back contacts b
of relays OCR and OCD, front contact (1 of relay
03, wire 23, front contact I) of relay 2F through
relay 23G to terminal C. Relay 23G picks up, its
contact a completing a stick circuit extending over
contact a of relay OLBP, Fig. 1A, wire 60, back 25 back contacts a of the associated G relays in se
contact a of relay SP, front contact d of relay OI,
ries to wire 29, and thence to terminal B at wire
Wire 2|, ‘through relay E to terminal C, and relay
60.
E then completes a stick circuit at its front con
When relay 23G picks up, the branch circuits
tact at extending over back contact m of relay 2F,
extending from wire 33 to terminal B over the
and over back contacts of relays 3F to BF, if pro 30 contacts of those starting relays which have 23
vided, to wire 29, and thence over resistor W4,
as the ?rst two digits of their code calls are dis
back contact a of relay SP and wire 60 to terminal
connected from Wire 33 and divided into branches
B at contact a of relay OLBP,
by contacts 9 to k of relay 2G and connected to
It is to be understood that each of the branch
wires 34 to 33 to prepare circuits for'gcnerating
circuits extending from terminal B at contact b
the third digit of the calls 234 to 238, respectively.
of a starting relay‘ST to wire 41 identi?es the cor
responding code call, as indicated by the refer
ences 234 to 238, adjacent contacts g to k of relay
23G. When relay E picks up, these branches are
all disconnected from wire 131 and divided into
groups by contacts 9 to lb of relay E, and con
nected to wires 32 to 36 to prepare circuits for
generating the ?rst digit of the code call.
When relay 02 picks up on the second step, the
connection from terminal B to wire 32 is ex
tended over contact 0 of relay 02, back contact J‘
of relay OCR to wire 62, and thence to the left
hand terminal of relay OT, thereby short circuit
ing its winding and holding relay OT released to
generate a, long second step. Relays 0L2 and OLP
release, completing a circuit from terminal B at
wire 60 over back contact a of relay OCR, wire 58,
back contacts d of relays 0L2 and OLP, wire 64,
back contacts d of relays OCR and OCD, front
contact d of relay 02, wire 22, front contact 17 of
relay E through relay 2F to terminal C. Relay 2F
picks up, its contact a completing its stick circuit
extending over back contacts a of relay 23G and
The interruption of the connection to wire 63 by
the opening of back contact g of relay 23G allows
relay OT to release to begin the fourth step.
Relay 2F is released by the opening of back conv
40 tact a of relay 23G, and the opening of front con
tacts h to k of relay 2F disconnects the branch
circuits which these contacts control, thereby
limiting the control‘ of the third digit to those
starting relays of the group 235 to 238.
45
When relay 04 picks up, the connection from
terminal B over wire 34 is extended'over contact
0 of relay O4 and back contact f of relay OCR
and wire 62 to hold relay OT released to gen
erate the long fourth step of the code call 234.
50 Relays 0L2 and OLP release, completing a circuit
from terminal B at wire 66 over back contact a
of relay OCR, wire 58, back contacts (1 of relays
OLP and 0L2, wire 64, back contacts at of relays
OCR and OCD, front contact if of relay 04, wire
55 24, contact b of relay 23G through relay 23% to
terminal‘C. Relay 234s picks up and the closing
of its front contact a extends the connection from
terminal B at its left-hand terminal, to wire 33
and thence through relay SP to terminal C, so
of other G relays of the same group, such as the
relays 24G to 21G, if provided, to wire 29, and 60 that relay SP picks up, completing its stick circuit
extending from terminal B over wire 6% and its
thence to terminal B over wire 6%].
front contact a and winding to terminal C, and
When relay 2F picks up, the branch circuits ex
also completing a stick circuit for relay 2315s ex
tending from wire 32 to terminal B over the con
tending from terminal B at the front‘ contact a of
tacts of those starting relays which have 2 as the
relay SP, wire Siland the front contact a and
?rst digit of their code calls are disconnected from
winding of relay 234$ toterminal C.
i
wire 32 and divided into groups/by contacts 9 to k
The interruption of the connection to wire ‘62
of relay 2F and connected to Wires 33‘to 31 to pre
by the opening of back contact 51'" of relay 2343
pare circuits for generating the second digit of
allows relay OT to pick up to begin the fourth
the code call. The interruption of the connec
.
tion to wire 62 by the opening of back contact 9 70 step.
of relay 2F allows relay OT to pick up to begin
It'will be seen, therefore, that whereas at the
the third step.
Relay E is released by the opening of back con
tact m of relay 2F, and the opening of- front con
tacts h to k of relay E disconnects the branch cir
end of the ?rst long step, relay CT is operated
‘by opening a front contact of relay LP, in the
case of the long steps of the station code call
75 relay OT is operated by the opening of back con
2,411,375‘
12
tacts of the selecting relays .215‘, 23G and 234s,
tiontof the associatedstarting button 'S'I‘B to
respectively, each of which relays picks up in re
sponse to' the closing of a back contact of relay
LP. It followsthat the long steps of the station
the“ button is operated before'zthea?rst' code. is.
code can are all-of-the same length, but these
are slightly longer than the other long stepsof
Duringthe. reception of an ‘indication'code,
relay O?‘and' the relay S of the selected panel: are
the;code';.which 'are terminated in the same man
also energized as in the case of the control code
store ~ 9. second code‘ for transmission;v even though -1
completed;
described, but then=receivingrelay OM is‘ not
energized‘iand its‘ backicontact 9 provides a con
When": relay S3v picks up, the opening of its.
back "contact a disconnects terminal B from wire 10 nection from terminal '3 to wire 46 to preventthe
nerrasthelong ?rst step.
29, thereby releasing relay 23G. The opening of
release of the starting relay, such ‘as relay ‘23’4ST, ,
in response ‘to the‘ operation of:relay.-OB;v
the front contacts I)‘ to f of relay 23G opens the
When relay 0 l E picks-up on-the sixteenth step,..
pick-up circuits for relay 234s and other similar
which, being duezto thee release'of :r'elay OT; is a 1
relays 2353 to 2388, not shown, of the same group,
while the. opening of front contacts h to k of 15 line closed step, termina'lBiis‘disconnected from.
relay 23G prevents the generation of long code
wires 68. and H3 at back contact‘ 6 of reIayVO'IB -
elements on the ?fth to eighth steps, when con
slightly‘ before relay .Olrreleases to‘;close itsi backv
contact ,g.. Consequently‘. relay OT ‘remains re‘
wires. 35 to 38- are successively closed.
leased, relay OR remains normal; and ‘relay OM-'
The fifth to eighth steps are therefore short, 20 jreleases, andxth'enthe timing'irelays, OLaZ, .OLP,
and :when relay 08 picks up a circuit is completed
OIiB; OliBP'and‘ OLI release in that orderx Relay/J
066, which is held energized over a stick circuit?
from terminal B over Wire BiLcontact h of relay
including wire 481'and contact b of relay OLB be
O8,;contact b of relay SP, through'relay OCR to
. tacts e of the counting relays O5 to 08 leading. to
terminal C." Relay OCR therefore picks up on the "
comes deenergized upon the release of relay OLB ‘
eighth step completing a stick .circuit at its front 25 and releases. Relay 'OLBPYY disconnects terminal-vi
B from wire 68, thereby releasing relays CR,'1SP I‘
contact .a, The opening of back contact a of
andthe operated selector relayv such as. 2312s,:
relay OCR disconnects terminal B from Wire 58
whereupon .the apparatus is in conditionsto .re-./
and hence from wires es and t4, and the closing
ceive a new code. If any other office starting relay
of front contact 9 of relay OCR prepares a circuit
extending from wire I9 over backcontact b of 30. has been picked up ,to storea .controlfcode‘, such 1,
codewill be initiated upon, the release of‘relay '
relay RCR, back contact a of relay 0'! and front
contact b of relay 08 through relay O! to termi
OLai , this relay being the lastto release. The six-.
teenth step thus corresponds to the return of the‘ ~
nal C,‘ to allow relay 0! to be operated as‘ the
next in order‘after relay 03.
line circuit to its normal closed condition, and
.in.~case of the transmissionpf. successive codes,
Steps 9 to 15 of the code have now been ren
represents a line closed ‘step which is materially
dered available for the control of seven movable
longer than any .suchistep occurring within a »
devices at the selected. stations, in accordance
with the positions of the control levers or push
code;
Consirlering now the operation. of ‘the station
buttons of-the corresponding panel, such as the
apparatusof Figs: 2A, >2B1and‘2C‘in receiving a »
one shown in Fig.'lC. VWhen relay 234$ picks
control code‘
just described, it will be‘under-J
up, terminal B becomes connected over its con
tacts d to h' to the lever contacts and thence to v
the wires 39 to‘ 45 leading to contacts 1‘ of relays O1 to 07. With‘relay OCR‘ picked up, the f ‘
contacts of the-r-odd-numbered counting ‘relays
provide connections over front contact 11 of relay
SP,¥front contacts e and b'ofrelays Old and ‘
OLPJin parallel, front contact e of relay OCR to '
wire 6|v and thence to the stick circuit for relay‘ .
' O-T, whereby relay. OT may be held energized
untilvrelays OLl and. OLP release, to thereby
generate long odd-numbered code elements. The
f contacts of the even-numbered counting relays
stood that the line ‘relay R at each vstationv and ~ .
the timing reEays'Li, L2, LP," LB and LBP operate 1.
in'unison with the corresponding .ofiice relays.
The counting relays at .each station operate
through the first eight steps'in’unison. with they
o?c‘e :ccunting relays, while only those at the.
selectedqstation atwhich :the selector'relay S‘ is‘
picked ‘up,:*are operated through their second .
I'cycle; Onthe first step ;of_~the; control code a
delivery ‘control relay 'CD'is selectivelyioperated:‘
inv
long
response
character
to' the‘release
of _this"step,'.over
ofv relay ‘Ll,
a circuit;
clueyto the
eX-w
provide connections over front contacts 0 of re
tending from terminaLB at frontv contact CV01}:
lays 0L2 and OLP in parallel, and front contact
1‘ of relay OCR to wire 62, and thence to the left
:relay‘LBP, wire i?il, ‘back-contact d of "relay<Ll_,:1
hand‘ terminal oflrelay OT, whereby relay OT.
may be vheld-released until relays 0L2 and OLP -
wire £693, fbaokv'contact b of relay CR,~conta‘ct c"
of relay -i, through the "upper winding of relay,"
CD'to terminal ‘C.- Relay‘. CD picks up and ‘com-‘
pletes a stick circuit from terminal Blat-jwire I601,‘
release, to thereby generate long even-numberedv
code'~ elements, these .circuits obviously being 60'". over its contact a and~lower=winding~ to termia Y
nal C.
v
,
available only‘during~~'the second cycle of opera
As shown in Fig 2C; the-station- coding unit
tion of the counting relays. In View of the simi
larity of these control circuits to those‘ of Patent
No. 2,229,249, a detailed description in the present
contains a set of ‘three selector- relays ‘FA, GA’
described,;its' contact’i transfers the direct con
nection of'terminal- B tothe stick circuit for the
relay ‘8 is responsive ;to_ ther~code ‘call 234»- The
circuits‘for these relays aregenerally- similar to
thosefor the o?ice selecting‘relays alreadyde
iscribedp The-circuits- for the selector relays/which
‘ and vS,.;'~.vhiclr1- may be‘ adju‘sta'bly ‘connected-to
651 respond to anyone ofthe'thirty-?ve'code calls,
application is believed to ‘be unnecessary.
the connections asshown -.being*arranged~so; that- When the selector relay 234$ picks up as above‘
starting relay 234ST to one including wire 46 and -
extending to terminal B at back contact f of
relay O8,~>and it follows: that the operated starting
relay. such'as-i 23481’ is released‘ on~the eighth
step‘of the corresponding code. This'has the ad_
vantage‘ that it permits the starting relay of. any
paneltO-be ‘reenergizedby a momentary opera-v
respond
terminal- on
B ateven-numbered
front contact a‘ steps
of relay-LBPgFig.
.- extend" from“ .
2A, over wire let/back contact at of relay L2, wire
ltd, ‘back’ contact-d of relay CR,ifront contact 4d j
‘.‘of relay CD'and thence;over'frontycontacts d of:
2,411,375
13
relays 2, 4, 6 and 8 to wires I22, I24, I26 and I28.
As shown, a connection to wire I22 provides a
'circuit for energizing relay FA on the second step,
relay FA having a stick circuit extending to ter
minal B at wire I66 over its own front contact a
and a back contact "/22 of relay GA. The circuits
for the selector relays which respond on odd- ,
14
stick relays, such as the relays FS and MCS
shown.
These polar stick relays are operated to normal .
or reverse by impulses supplied by the coding
unit over wires I49 to I55, inclusive, and are
placed under the control of the station coding
unit by the operation of a delivery relay D. Re
lay D at the selected station is picked up when
relay 8 releases on the ninth step of a control
numbered steps extend from terminal B at wire
I60 over back contact (1 of relay LI, wire I53, back
contact 21 of relay CR, front contact I] of relay 101 code, over a circuit extending from terminal B
CD, and thence over front contacts cl of relays
at contact 0 of relay CR, Fig. 23, back contact e
3, 5 and ‘I to wires I23, I25 and IN. As shown,
of relay 8, front contact 0 of relay CD, wire H5,
a connection to wire I23 provides a circuit over
front contact g of relay S through relay D to
contact I) of relay FA for energizing relay GA, the
terminal C, and remains energized until the end
stick circuit for which extends to terminal B‘ at 15 of the code.
wire I60 over its own front contact a, and back
Circuits suitable for operating the polar stick
contact a of relay S. Similarly, a connection to
control relays in accordance with the long .or
wire I24 provides a circuit over contact b of relay
short character of the ninth to ?fteenth steps of
GA for energizing relay S, the stick circuit for
the code are obtained by the operation of a pair
which is connected directly to terminal B at wire 20 of register relays PI and P2, Fig. 2A, the circuits ‘
see over its own front contact a.
for which are prepared by the closing of front
It is to be noted that the various selecting re
contacts of relays CR and CD. If relay LI re.
lays
G and S are operated directly following
leases on any odd-numbered step of the group
the release of relay LI or L2 when the apparatus
comprising steps 9 to I5, a circuit is closed from
is in the receiving condition as described, and 25 terminal B at contact a of relay L'BP, wire I60,
consequently these relays are operated prior to
back contact (1 of relay LI, wire I 63, front con
the termination of the long steps, thereby pro
tact b of relay CR, front contact h of relay CD,
viding a margin to allow for variations in timing.
wire I29, and the upper winding of relay PI to
It is to be understood that the relays FA at the
terminal C. When relay PI picks up, it is held
different locations may be connected to any of 30. energized for the duration of the next following
even-numbered step over a stick circuit extend
the wires I22 to I26, and the relays GA to any
ing from terminal B at the left-hand contact a
of the wires I23 to I21 below the one to which
of relay R, front contact 01 of relay LBP and the
the associated relay FA is connected. It follows
front contact a and lower winding of relay PI
that when the code call is 234, those relays FA
' to terminal C, relay PI releasing when the left
connected to wire I22 will respond to the second
hand contact a of relay R is opened at the be
long step, those relays FA and GA connected to
ginning of the next odd-numbered step. Simi
wire I23 will respond to the third long step and
larly, if relay L2 releases on any one of the even
those relays FA and GA connected to wire I24
numbered steps III, I2 or I4, relay P2 is ener
will respond to the fourth long step along with
relay s of the selected station storage unit, but 40. gized over the circuit from terminal B at wire
I60, back contact 01 of relay L2, wire I64, front
that the selection will be completed to pick up
contact (1 of relay CR, contact a‘ of relay CD, wire
a relay S at one location only. At theiother
I19 and the upper winding of relay P2 to termi
locations the counting relay operations terminate
nal
C. When relay P2 picks up, it is held ener-‘
with the eighth step and only the line relay R
and the timing relays continue in operation 4. gized for the duration of the next odd-numbered
step, during which relay R is reversed, over a
through the remainder of the code.
stick
circuit extending from terminal B at the
At the selected station, relay S prepares a pick—
right-hand contact a of relay R, back contact e
up circuit for relay CR completed on the eighth
of relay I 6, front contact b of relay LB? and
step. 7 This circuit extends from terminal B at
the front contact and lower winding of relay P2
50
contact :1 of relay S, Fig. 2C, wire I46, contact 1‘
to terminal C, relay P2 releasing when the right
of relay 8, relay CR. to terminal C, and when relay
hand contact a Of relay R is opened at the be
CR picks up, its front contact a completes its stick
circuit extending to terminal B over wire I60.
ginning of the next‘odd-numbered step.
‘
The circuits which the contacts of relays PI
Front contact g of relay CR. completes a connec
and P2 provide for the control of the polar stick
tion from wire I I9 over back contact a of relay 1 55 relays are of a variety of types, one of which is
and front contact b of relay 8 for effecting the
operation of relay I next in order after relay 8,
and front contact 72 of relay CR completes a con
nection over back contact g of relay 8 for ener
gizing relay It‘ in place of relay 8, on the six
teenth step.
The ninth to ?fteenth steps of the control code
are employed for the control of a series of con
trol relays of the stick polar type, in accordance
with the positions of the corresponding o?ice
levers. Fig. 20 shows a typical arrangement of
such relays including a switch control relay WS
and signal control relays LI-IS, RHS and COS,
illustrated bythe circuits for relay WS, which
relay is controlled in accordance with the posi
tion of the switch lever SW of Fig. 10. When
lever SW is normal, the ninth step of the control
Code is long and the eleventh step short, and
when lever SW is reversed, the ninth step is short
and the eleventh step long. If lever SW is nor
Vmal, relay PI is picked up‘ on the ninth step,
and When relay R is operated to the left to begin
the tenth step, its contact a connects terminal B
to the stick circuit for relay PI to hold it picked
up, and also connects terminal B to front contact
b of relay PI to complete a circuit momentarily
which may be used to control a track switch and 70 over wire III, contact e of relay I, wire I49, con
an associated group of signals in the manner
tact a of relay D through the upper winding of
described in connection with Figs. 8 and 9 of
relay WS and the front contact of relay LR to
Patent No, 2,229,249. In the present system,
terminal C, thereby operating the contacts of
however, the control code includes two additional ‘7 relay WS to their left-hand position as shown.
steps providingfor the control of two additional
Relay WS is thus energized in the normal direc
2,411,375 f‘:
tion in multiple with relay 2, by animpulse which.
is terminated upon the release of relay 1 . Relay.
PI is not operated“ on: the. eleventh step, and
release ‘ in unison‘ with :the corresponding;.oflicerr
relays'and' likewise the-relays .1, ‘it; CR and‘ S :at
'
although, v.at the beginning-of ‘the. twelfth step,
the‘ selected station,.relay. Li. beingthevlast vto: '
release. Relay CD is released by relay LBP along .
wire" III is connected momentarily over contact .
With relay CR and then'relay D is released, plac
e of relay 3,‘wire I51‘, contact c of‘ relayDand
the lower ‘winding ‘of relay WS toterminal C;
ing the apparatus in‘ condition to receive a newv
code. The release ofLrelay. Ll. places the appa-.
ratusin condition .ito initiate the transmission of
relay WS'is not energized because relay Pi is. in
an indication "code; iassuniingthat the relay 'SS,
its released position in'whichlwire'l H‘ is discon;
nected‘ fromterminal‘B; Similarly,"if lever SW 10 hereinafter describedgis: not -.energizecl.
The. station:codingrapparatus of Figs. 2A, 2B
is reversed, so that the ninth step is short, relay
Pl remains released and relay .WSis not oper
and.:2C'. is also adapted to transmitindication
codes whichthe. of?cezapparatus is adapted to
ated on‘vthe itenth: step, 4 and. when the. long‘ elev
enth step is. reached irelay Pl‘ipicks up'so that
receive. Each indication code‘ comprises sixteen
relay WS‘ receives an impulse throughiits lower 15 steps, of which the? ?rstlis relatively short, the
second to eighthiarezarranged inzdiflerent com
Winding to. operate .it to reverse on the twelfth
step.
binations of threeilo-ng.=-and four. short steps to
operate selecting .relays'F, ‘G and S at the office ~
Another'typ‘e of 'contr‘olcir'cuit-is illustrated by
the one" forlrelayiFS; which is ‘controlled by the
and station in‘ accordance with different code
o?ice Ikey 'FTB so as to be operated .to normal or 20 calls as alreadyv described, and in which. theninth
to ?fteenth steps mayl'belmade long or short to
reverse in accordance lwithlthel' short or long
character of a single‘code‘ step”: If the tenthstep
indicate the condition ‘of-seven movable devices
is short, relay 'P2'is'rin tits‘ released positioniiwhen
at the station by the operation of a group of indi
relay R1 is operatedfto :the right. to begin” the
cation‘relays K-“of the selected oiiice panel, on
eleventhstep; anda circuit'iswthen closed m0 25 the sixteenth step of the code.
mentarilyi from terminal 3' at the; right-hand
contact‘aof relay R'overiback contact e of relay
A typical group of such devices is shown in Fig.
26, illustrated asagroupof indicatingrelays
including a trackistc'ring relay TKS, an approach
I6,-'front contact b-of relay. LBP,; backcontact-b
of relay P2, Wire vl 56 through‘relay PS to contact
relay .AR, . a power-o?xrelay .POR, normal . and
b ‘of relay-1D", wire v.IEELx-contact e of relay 2,'wire 30' reverse switch repeating relays NWPand RWP,
and two .signal3contro1 relays LHR‘ and RHR.
H2,.b'ack contact fc of‘ relay P2,.to terminal-Use
that relay:v FS' is operated Ito - theileft.
If’ ‘the
The station apparatus;.isarr‘anged to initiate an
indication.codexautomaticallydn response to a
tenth step .islong. relay P2‘ ispicked .up .and held
energized by relay Rifor the duration of the elev
change in position ofany ofrthe indicating relays,
enth step and its'contacts b and '0 reverse the 35 each’ ‘such code‘ ‘being stored ‘for transmission
direction ofithe‘ flow of current. through‘relay FS,
andit will-be .operate‘dito. the right. The cir
when the- line. circuit ‘becomes available, by the
release of the station starting-relay ST of Fig. 2C.
cuits 'fori-relays'MSC‘Land COS are similarly. con
Relay .ST is normallyheld energized over a stick
trolled by relay ‘P2,. andirelays LI-IS ‘and RHS .
circuit extending frornxterminal B at its own
by‘relay'PLeach by a momentary impulse at 40 front contact mover back contact e of relay S,
the beginning. of the “step following. its assigned
the winding of relay ST and thence over a front
step, that-is to say» following the'step the char
or- back contact c ‘of eachiof the several indicat
acter of iiwhich governs its operation.
Relays‘
LI-IS and RHS are also provided ‘with a local re
storing circuit which functions ‘in ‘a manner here-I
ing relays, in series, .to. terminalC. An indication
code may also be initiated manually by thetrans
mission of a special ,‘frecall’f. code from the office,
inaft'er described ‘:to' energize these relays in the
' by means of which relay ST Inayalso be released, ~
as explained hereinaften. Heretofore a normally '
normal : directio‘m :in response ~ to; ' the release ' of
energized starting. vcircuit ofv this type has been
objected .to because of the necessity‘ for a special
trolling-polar stick-‘relays are described‘: .Inthe 50 adjustment of thelcontactsloi the indicating re
?rst type-i as.~ill.ustrate'd5by the. circuitforfrelay ‘
laysin order to. insure the release of the starting
WS, the polar stick>relaiy isuenergized only ‘if the‘.
relay during the brief period the circuit is opened _'
corresponding register relay. P3 or P2‘ is picked‘ up
during the transitof the contact from one posi
response to along step,i-and'ilis .noneresponsive
tion to another, This cli?iculty hasybeen over
the .track'relay'lTR‘. .
'
' In the foregoing-two types of circuits for con
iftheistep is ‘short; . In-the second type, as illus
55 come in the circuitsv as'shown by'the use ofa
trated by the circuitfor relay. FSy-‘the polar. stick '
sensitive relay of the biased polar type having an
relay is’energizedinlone direction if the assigned.
inductance ‘ '58 ‘connected
step ‘is’. long ‘and in'the opposite directionrif ‘that 7
The energy stored 'in' coil "it when relay-ST is '
energized provides ~asource of induced current 1
step is short.
A, third type, not-shown, ‘is-also‘
across
its ‘ terminals. _
availablegandvmay be ebtaine'd by ~ connecting. 60 for operating relay ST to its reverse position to
anyof ~the-relays to “wire 158' orrl59,'ile'ading-to -
open its stick circuit in response to any sudden
back ‘contact “a of ‘relay Pt'vor- P i, Fig; 2A,1~instead
of to wire I56 vYer; i5‘l. Assuming that one ter
minal of relay PS isconnecte‘dto wire ‘I58 instead" ‘
increase in circuit resistance due to- the movement '
of "to'wir'e l56',~for-eXample,-= its other terminal 7
being connected to‘rwire HB-IasshoWn, it- will-be
seenthat'relay FS will be-momentar-ily energized‘
by ' relay'R only when the assigned-step .is .short
solthatv relay P2 ‘lremains 1released.
It‘ vfollows
of one’ of~the~indicating relay-contacts 0, even
though- the time such contact is actually open
~ is substantially zero,'consequently no special ad
justment of these contacts is needed;
VI shall next describe the transmission of an
indication code by'the apparatus of Figs. 2A, 2B
and 2C, assuming the code to beinitiated as the
that any-of the. polar stick ‘relays maybear 70 result of a train movementthro-ugh thetrack
ranged to respond to a short step-but -to'- be non
responsive when the step isflong;
section VIT. The opening. of ‘contact a of the
track relay TR; opens the normallyv closed stick
When the - sixteenth: step c of ‘the’ control;:.icode
circuit for relay TKSv extending vto terminalB .at .
is reached; the line relays‘ R; remain steadily. ener- ,
its-‘fr'ont contact 1),‘; and ‘also vopens its pickeup
gized 4 iand-"the-lltiming relayslL-l ati- eachlstation
‘circuit extending 'fromiterminal l3 atback ‘contact. 0
2,411,375?
.
18
17'
h of relay MSP, left-hand contact 02 of relay ST
at a considerable distance from the‘ office it may
be that the voltage across the line, which, varies
from nearly the full voltage'of battery 8!] at the
office to substantially zero at the point where the
shunt is applied, will remain su?icient to keep
the relays R picked upat stations near the office.
These relays, however, will be released by the
reversal of line polarity by relay PC. It follows
that all line relays R release substantially in
and front contact a of relay TR through relay
TKS to terminal C, and relay TKS releases, its
contact 0 in turn, opening the stick circuit for
relay ST causing it to release.
If the line circuit is available, the starting cir
cuit is closed, extending from terminal 13 over
back contacts I) of relays ST and SS, wire Hi7,
contact Z) of relay RP,-contact a of a cut-out relay
COR, back contacts b of relays L! and L2 through 10 unison when any relay M picks up to initiate a
relay M to terminal C. Relay M picks up, com
code, each relay R operating its timing relays L
pleting a temporary stick circuit over its contact
and ?rst counting relay 1.
a extending to terminal B at wire Ml over back
At each station at which relay M is not op
contact 0 of relay LBP. Contacts b and d of relay
erated, relay R remains released, holding relay
M reverse the connections of relay R'to line wires 15 L2 energized but allowing relay Ll to release to
pick up relay CD, and then relays LP, LB, LBP,
, Y and Z, front contact d of relay M also closing
a low impedance shunt path from line Y over
back contacts I of relays CD and LPB to line Z.
l and CD release in that order.
Contacts 0 and d of relay M now connect the
condensers of the low pass ?lter LPF' across the
front contact e of relay M completes the pulsing
circuit for relay T, which extends from‘ terminal
B at back contact e of relay ‘CD, Fig. 2B,. over
back contact e of relay l5 and back contacts g
of relays ‘l, 5, 3 and l, wire I68, contact e of relay
M through relay T and resistors W5 and WT to
‘
‘
At the transmitting station, the closing of
line, so that during transmission, its connections
correspond to those of the one at the office. Nor
mally, the impedance across the line presented
by the station apparatus is materially increased,
as is desirable, by disconnecting those condensers, 25 terminal C. Relay T transmits the code by *the
this arrangement being shown in a co-pending
operation of its contact b which is rendered e?e‘c
tive when relay LBP picks up on the ?rst step
application for Letters Patent of the‘ United
to open its back contact J‘ in parallel therewith.
States Serial No. 401,092, ?led July 5, 1941, by
G. W. Baughman and N. F. Agnew, for Remote
control systems.
Each time relay T picks up, a low resistance shunt
30 path is closed from line Y over back contact f
When the line circuit is shunted by relay M,
of relay CD, front contact I) of relay T and front
the associated line relay R releases and the in
crease in current delivered by battery 80 causes
contact d of relay M to line Z, and at the same
time, the circuit for relay R which‘ now extends
transformer RT,v Fig, 1A, to deliver an impulse
from the positive wire Z over front contact 11
operating relay OR to reverse substantially in 35 of relay M, back contact b‘ of relay T, resistor
unison with relay R.
Wi, relay R, front ‘contact 19 of relay M to wire
Relay R operates the associated timing relays
Y, is opened by relay T, thereby releasing ‘relay,
and relay I, the closing of contact 0 of relay LB
R more quickly than if it was merely short cir
completing the normal stick circuit for relay M‘
cuited by the ‘closing of front contact b of re—.
extending over wire H8 and back contacts e of 40
relays l6 and CD‘ to terminal B.
Relay OR operates the timing relays 0L,’
relay I and relay E, as on the ?rst step of a con
trol code, and in addition a circuit is completed
from terminal B at the right-hand contact a
of relay OR over back contact 71. of relay OLBP,
back contact I) of relay OM, back contact d of
relay 0! 6 through relay PC to wire I‘! and thence
to terminal C at contact a of button CB. Relay
PC therefore picks up and its contacts b and d
reverse the polarity of the ‘current delivered to
the line, while its contact 0 completes a circuit
energizing a slow pick-up», slow release repeating
lay
T.
‘
>
.
.
Although the ?rst stepIof ‘an indication code
is short in comparison with the ?rst step of a
control codeait is slightly longer than the other
short steps, since it begins .beforerelay T picks
up, and because relayT‘is held energized until
relay LB picks up, which occurs shortly after
relay l picks up to open the ‘pulsing circuit, clue
to‘ the provisionv of a connection from terminal B,
at back contact e ‘of relay LBP over back contact
at of relay LB to wire; I68.‘
The response of the apparatus at the transmit,
ting station as required to allow the transmission
to continue is also dependent ‘upon conditions at
relay PCP.
’
‘
o?ice. Since the connections of relay R tov
The‘sudden variation in the line current due 55 the
the line have been reversed by relay M, relay R
to the operation of relay PC is devoid of effect
upon relay OR for the reason that when relay
PC picks up, the secondary of transformer RT
is momentarily short circuited over the front con- '
tact c of relay PC and back contact 0 of relay
PCP, and the lower winding of relay OR is ener
gized in the reverse direction over the circuit ex
tending from terminal B at back contact b of
relay PCP, front contact 1‘ of relay PC, and back
contacts 0 of relays X, OM and OT through relay
DR to terminal 0. Relay PC is held energized
over a stick circuit including its front contact a
and front contact h of relay OLBP until relay
Ol6 picks up upon the return of relay OR to
normal at the end of the code.
‘
The shunt across line wires Y and Z applied
by relay M at the transmitting station as de
scribed will also ‘short circuit and consequently ‘
release the line relays R at stations more remote 1
picks up to begin the second step only if relay PC
has been picked up to reverse the polarity of the
line current, this indicating that the o?lce appa
ratus is in- the proper receiying condition with
relay OM released,
'
i
.
1
The code call ‘steps of the indication code are
generated by relay T inthe same ‘manner as by
relay OT in the control codealready described.
Assuming‘this to be 234, the second step is‘ pro
longed'by the closing of a‘hold-down circuit for
relay T extending from terminalB over back con—.
tacts c of relays ST,‘ SS and S, back contact g of
relay GA, back contact ,6 of relay FA to wire 132,:
thence over contact 0 of relay 2 and back contact
J‘ of relay CR, wire I62, contact I of relay Mhand.
back contact 0 of relay T'to its lefteha'nd terminal,
thereby ‘short circuiting relay ‘TL , On the ‘second
step, relayFA picks up in'response to the re
lease of relays L2 and
and‘its contact e‘tra‘ns
fromth'e oilice. ‘If the transmitting station is 75 fers the connection of‘ terminal]; from wire I32.
19
2,411,375
20
lay T remains released and relay M releases, re~
to wire I33, opening the hold-down circuit for re
lay T to allow it to pick up to begin the third step.
The third step is prolonged by the operation of
the stick circuit for relay T extending from termi
nal B over front contact e of relay FA to wire I33,
versing the connections for relay R to render it
responsive only to line current of normal polarity.
‘At the‘oii‘ice, relay OR is operated to normal,
' thence over contact 0 of relay 3, back contact e of
back contact at releases relay PC‘, thereby restor
ing the line polarity to normal so that relay R
energizing relay OIS, which relay by opening its
relay CR, wire, ISI, contact a of relay T and the
Winding and front contact'c of relay T and re
sistor W'I to terminal C. On the third step, relay
GA picks up in response to the release of relays
LI and LP and its contact 9 transfers the con
will remain steadily energized after relay M re- "
leases.- Relay PC releases relay PCP,‘ and relay
OR release-s ‘relays 0L2, OLP, OLB, OLBP and
V
OLI, in’ order.
.
.
Relay OR remains in its normal position and
is not affected by the operation of relay PC be
nection of terminal B from wire I33 to wire I34,
' opening the stick circuit for relay T to allow it to
release to begin the fourth step, which like the
second, is prolonged by the operation of a hold
down circuit for relay T, the circuit for generating
circuited over back contact 0 of relay PC and
front contact 0 of relay PCP, and relay OR is.
the long fourth step including front contact g of
relay GA, wire I34 and contact 0 of relay 4. On
PCP releases over the circuit extending from ter
cause when this occurs transformer RT is short
held energized in the normal direction until relay
the fourth step, the station selector relay S picks
minal O through the lower winding of relay OR,
up in response to the release of relays L2 and LP, 20 back contacts e of relays OT, OM and X, back
the opening of back contact 0 of relay S allowing
contact 1' of relay PC, and front contact a of
relay T to release to begin the ?fth step.
relay PCP to terminal C.
When relay S picks up it completes the circuit
The restoration of the line polarity to normal
for the repeating relay MSP, extending from ter
by relay PC causes the line relay R at each of
minal B at front contact g of relay M, Fig. 2A,
the other stations to pick up. At these stations,
over wire I69, contact b of relay S through relay
relays LI, LP, LB and LBP pick up‘ and then
MSP to terminal C. Relay MSP therefore picks
relays L2, LP, LB, LBP and LI release in that
up on the step corresponding to the last digit of
order.
the code call, remaining energized until the end
At the transmitting station, even though relay
of the code.
Since the pulsing circuit for relay T‘ functions
in the same manner as that for relay OT already
described, it will be clear that if relay S is op
erated on the fourth step, the ?fth to eighth
steps will be short steps, generated by the opera
tion of relay T over its pulsing circuit. Relay CR
M releases at the exact instant that the line
polarity is restored to normal, relay‘ R may be
momentarily, deenergized, but since relay I6 is
picked up, its contacts d and e connect the right
hand and left-hand contacts a and b of relay R
.. together so that the circuits controlled by relay "
‘R remain in the same condition as if relay R
remained steadily energized.‘ Consequently the
picks up on the eighth step over the circuit ex
tending from terminal B at contact d of relay
timing relaysL at that station release in order,
S, wire I46, contact I of relay 8 through relay
substantially in unison With those at the ofiice
CR, to terminal C, relay CR completing its stick 4.0 and slightly in advance of those at the other sta
circuit extending to terminal B at wire Hill by
tions. Relay MS? is released by relay M, relay It
closing its front contact a.
is released by relay LB and relays CR and S are
When relay CR picks up, it completes a pick
released-by relay LBP. When relay. M releases,
up circuit for the normally energized starting
its back contact 21-, Fig. 2B, connects wire, I23
relay ST extending from‘ terminal B at contact 0
over back'contact‘ h'of relay I to wire IIli ‘to
maintain the temporary stick ‘circuit forrelay
of relay CR over front contact me of relay 8, front
ST closed after relay LB releases. When relay S
contact in of relay M, wire II4, front contact J‘ of
releases, the dropping of its continuity transfer
relay S through relay ST and coil ‘Ill, in parallel,
and thence over the front or back contacts 0 of
contact 6 restores the normal stick circuit over
the indicating relays TKS, etc., to. terminal C.
Relay ST picks up and establishes a temporary
stick circuit extending from terminal B at its
which relay ST is held» energized until a change
front contact a over front contact 6 of relay S,
It‘will be seen that all coding unitsarereé
stored to normal and placed in the proper re
ceiving condition prior‘to the release of relays
occurs in the position of one of the indicating
relays to‘initiate a new code.
wire I I3, front contact d of relay LE, to wire I Iii,
and thence as traced above through relay ST
and coil 10 to terminal C‘.
On the eighth step, relay CR establishes con
.
"
OLE‘ and LI to condition the system for the trans’
mission of the next code.
nections from terminal B at the contacts 19 of
.
'
. ‘ Achange in position of one of the indicating
the indicating relays NWP, TKS, etc. of Fig. 20
relays may occur during the transmission of the
over contacts a to yof relay MSP, wires I39 to 60 indication code just described. If this occurs
I46, completed successively over contacts 5‘ of
prior tov the transmission-of any of the indicating I
relays I to ‘I on the ninth to ?fteenth steps of the
steps nine to ?fteen, relayiST will be reenergized
. code, either over contact e of relay LI and contact
I) of relay LP, in parallel, and front contact 0
of relay CR to wire IBI, or over contact 6 of relay 65
L2 and contact 0 of relay LP, in parallel, and‘
front contact 1‘ of relay CR to wire I62, to hold
onthe eighth stepand but one/code will be trans
mitted. Since the pick-up circuit for relay ST
is opened at the beginning of the ninth step, the.
temporary stick circuit by ‘which relay ST is held
energized will bev opened to cause it to release,
again, if’ a change in the vposition of any‘of the
indicating relays, occurssubsequent to the trans
available for indicating the positions of seven 70 mission of the eighth step.’ Thus a: newindica
indicating relays at the same location.»
tion codetwill be transmitted to indicate the new
relay T up or down, as the case may be, until
relay LP releases, therebyv rendering these steps
When the sixteenth step is reached, relay R
at the transmitting station picks up, energizing
relay l6 which opens its back contact e to dis
connect terminal B from wires I68 and H8. Re
condition.
"
‘
w
w
_
"
t
‘
It may ‘also occur, dueto afault, that the trans- - a
mission} is interrupted before the; sixteenth step
75 is reached to restore the normal stick circuit for V
£4112 ‘3175";
21
22
relay ST. If an extended pause in theoperation
of relay R. occurs after relay ST has been picked
up, relay LI or L2 will release, releasing relay LB.
2C,‘over a contact of an‘ indicating relay, the
In this instance relay LB will open its contact at
before relay M releases, to release relay ST and
one of the register'relays 9 to I5 will be‘ picked up.
‘I If the ninth step is long, ‘for example, relay OLI ‘
thereby condition the apparatus ‘to retransmit
will release closing its‘ back contact b to complete
a‘ circuit from terminal B at contact a’ of‘ relay
OLBP‘ over‘ contact 1‘ oferelay PCP, back contact
corresponding step of the transmitted code will
be prolonged‘ andat the o?ce, the corresponding
the code in its entirety when the line becomes
available.
~
‘
=
~
Heretofore in connection with starting" relays
of the normally energized type, as illustrated for
example by the relay S of the Letters Patent of
the United States No. ‘2,273,231, issued February
_ d of relay‘OLI, wire 63, front contact b oflrelay
OCR, contact e of relay OI through relay 9 to
terminal C, relay 9 picking up to completeia stick
circuit extending to terminal B at wire 60 over
its front contact“ a, and also closing its contact
1'7, 1942, to C. S. Snavely 'et al., it has been nec
essary to provide a repeating relay SP, which is
restored to normal at the end of a complete code,
in order to make sure that a code interrupted on
any of the steps following the one on which the
starting relay is picked up, will be retransmitted.
This result is attained in accordance with my in
vention by the provision of a temporary holding
circuit as above described, in addition to the nor
mal holding circuit for the station starting relay
ST.
‘
b‘t'o connect terminal B to wire 49.
15:11
‘ On the sixteenth step, relay OIB picks up, clos
ing a circuit from terminal B over front contacts
0 of relays OCR. and OCD, Fig. 1B, contact 1‘ of
relay OIS, wire 56,,co1l1tact b of the selector relay
224s throughthe associated delivery relay 234D
20* to terminal C. Relay 234D therefore becomes
energized to‘ operate the indication relays K of
the group which it controls in accordance with
the positions of the register relays 9 to I5.‘ ‘ Relay
‘
I shall now describe the operation of the office
apparatus of Figs. 1A, 1B and 1G in receiving an
indication code. It will be understood that relay
234D opens the stick circuits for‘the relays K and
.;: prepares pick-up circuits for each'of these'relays,
extending over wires 49 to 55 to terminal B at the
front contacts b of relays 9 to I5, respectively, the
position of which indicates the condition of the
indicating relays of the group controlling the
OR is operated, through transformer RT, to the
right on each odd-numbered step and to the left
on each even-numbered step, and thus operates
its timing and counting relays through sixteen
steps in unison with the corresponding relays at
the transmitting station;
On the ?rst step, relays OLI, OI, E, PC and
PCP pick up as already described, as well ‘as
relays 0L2, OLP, OLB and OLBP, but relay OLI
does not ‘release because the ?rst step is short.
turn releases relay PCP. The release of‘ relay PC
restores the linev polarity to normal, relay OR
‘being held normal over back contact f of relay
PC and front contact a of relay PCP until relay
Selected ones of the of?ce relays F, G and ‘S
- PCP releases, relay OR. being 'disconnectedfrom
A transmission of the code.
The opening of back contact (1 of relay OI6 on
the sixteenth step releases relay PC, which in‘
pick up on the steps Corresponding to the digits
of the station code call. More particularly, in,
response to the code call 234, relays 2F and 23G
are operated on steps two and three, ‘and relays '
‘234s and SP‘ on step four. “In the receiving con
dition, back contact at of relay OLP in the circuits
for these relays is bridged by front contact [of ‘
relay PCP, so that these rela‘ysare picked up
upon the closing of back contact d of relay OLI
or 0L2, on the long steps.
'
‘
>
3
e
The energization of ‘relay PCP also prepares ‘a
circuit extending from‘terminal Bin Fig.'1A
overfront contacts 0 of relays OLI ‘and 0L2,
front ‘contact e of relay PCP, wire 59, front con
tact c of relay SP through the‘upper winding of
relay ‘0CD to terminal G. ‘Since’ relay ‘SP is
picked?‘ up over a back contact of relay OLI or
0L2, the circuit‘for relay 'OCD is held ‘open on ‘ ‘
the step on which relays S or ‘SP are‘operated,
and‘closes as soon as relay OLI or ‘0L2 picks‘ up
at the beginning of the next ‘I stepfollowing the
?nal digit of the station code call, that is, On the
?fth step 1when the code call is 234. ‘When re
lay OCD picks up it completes a-stick circuit
transformer ET by ‘the opening of back contact
0 of relay M6. The'o?ice timing relays then-re
lease in the normal order, relay OLI being the
last to release. Relay OLB releases relay'OIIS,
which releases‘ relay 234D, reestablishing the
stick circuits for the indication relays K which
were energized over wires 49 ‘to 55. Relay OLBP <
releases relays OCR, 0CD, SP and 2343, as well I
as the energized relays of the group 9 to I 5..‘
In the foregoing, it was assumed thatthe code.
was initiated by the release of the track relay TR,:
relay I I] being energized on the tenth step‘ and;
relay TK on the sixteenth step to light the lamp
TKE, and also, if key 'I‘KB is closed to operate
the bell relay-BR momentarily over contact b of
relay TK to actuate the single stroke bell‘BL.
If this code is repeated, relay ‘TK remains picked
up and the bell BL is notzoperated, as will be
readily apparent. Front contact a of relay TK
provides a connection from terminal B for ener
gizing the pen magnet PM of a graphic recorder
such as is usually provided in systems of this
' character.
over it’s‘contact a and lower winding'extending
to terminal B at wire" 69.
'In order to insure that magnet PM will be oper
ated iii-response to each train movement through
the controlling track section, even though the line
viously
‘Relaydescribed.
00R picks Front
up on contact
thefeighth
7‘ ofstep
relay
as PCP“
pre-‘?
circuit does not become available for, the trans
mission of the indication code until after the
maintains the connection from terminal Bat wire .
Glover back contacts (2 of relays 0L! and 0L2 to
‘ wires 63 and 64 after relay OCR picks up',‘am1 the
closing of front’ contacts b and d of relay OCR
track section has been vacated, a storing relay v
TKS is provided as shown in Fig. 20, which relay
is normally held energized over a stick circuit
_ extending from terminal B at its front contact
prepares circuits extending from wires'?s and'litl ‘ to b over front contact a of relay TR through relay
to contacts e‘ of relays OI to 0]’ whereby a series
TKS to terminal C. ‘The release of relay TR‘
of registerrelays 9 to I5 arerendered responsive
when a trainenters section IT therefore releases ;_
tothe character of the correspondingly numbered.
relay TKS to open itsstick circuit and to ‘con
steps of the code. .That is, when terminal B is} . . nect terminal B over itsfback‘contact b, to contact;_
connected to any one of the wires I39 to ‘I45, Fig?’ a b of relay MSP, to condition the unit to ‘transmit
2,411,375
23
24
a track occupied indication. Relay ST is released
by the dropping of contact 0 of reIayITKS, and
the normal order due to the deenergization of re~
lay L2, relay Ll being the last to release.
opens its contact din the pick-up circuit for relay
If a control code is terminated on an even
TKS extending to terminal B at back contact 72
numbered step prior to the sixteenth step, due to
of relay MSP, so that relay TKS remains released 01 the'failure of relay OT to pick up, relay OR is
until the track occupied code is transmitted.
held normal and the timing relays releasein the
normal order, relay OLBP releasing the count-v During the transmission of this code, back con
tact h of relay MSP opens prior to the closing of
ing and selecting relay circuits and also releas
ing relay OM, relay OLi, being the last to release.
contact (1 of’ relay ST, which occurs on the eighth
step, and when back contact h of relay MSP 10 The station line relays remain steadily energized
closes again on the sixteenth step, relay TKS be
and their timing relays release in the normal or—
comes reenergized, provided relay ST is picked
der as ‘at the end of a complete code, relay Li
up, indicating that the track occupied code has
being the last to release.
. v
been transmitted ‘andprovided also that relay
If an indication code ‘is terminated on an odd
TR is picked up. When relay TKS picks up, the
opening of its back contact c‘releases relay ST
again, to initiate a code for indicating the track
numbered step, as for example, would be the
case if relay T remainedpicked up due to a fault,
relay OR remains reversed until relay OLBP re
leases, relay OL2 remaining picked up. Relay
clear condition, but since relay ST is extremely
OR is restored to normal upon the closing of back
fast, the energizing circuit for relay TKS is
opened by relay ST before relay TKS is fully 20 contact J‘ of relay OLBP‘ over the circuit above
picked up to establish its stick "circuit. A con
denser CI of relatively large capacity-provides
sufficient energy‘, storage to prolong the energiza
tion of relay TKS until its front contact b closes
to establishits stick circuit, under the condition 2.5
described.’
-
~
'
1
traced which includes front‘ contacts of relays
PC,’ PCP and 0L2, and back contacts I of relays
OLBP AND'OLI.
At the transmitting station, relay R remains
released, and the timing relays Ll, LP, LB and
LBP release. Relay LB releases relay M, which
Relay TKS also controls a circuit for restoring
the polar stick signal control relays to normal
relay releases relay T. and removes the lineshunt
when a train enters the track section to release
tions for relay R so that relay R ‘remains re
applied by relay T,-and also reverses therconnec
relay TR, to prevent the clearing of the signals 30 leased, the apparatus assuming the. same. condi
automatically when a train vacates the track sec
tion as at the other stations where relay R and '
tion, no additional repeating relay being required,
this circuit extending from terminal B at back
the timing relays stand released with relay LZ'
contact b of relay TR over front contact a of
picked up.
When relay OR is restored to normal, the of?ce ,
relay TKS through the lower windings of relays 35 timing relays are reenergized and relay PC is'de
energized and releases before relay OLBP picks
LHs' and Rl-IS in- series, to .tBrminalC.
up. The office timing relays them release in the
I shall next describehow the system is restored
norma1 order, relayOLl being the last to release.
to normal in the case of a fault.
When relay PC releases, it restores the line po
A control code may be terminated on an odd
numbered step due to a fault, relay OT being held 40 larity to norma1 so all the line relays Rpick up
in unison,v reenergizing their timing relays, and
energized over wire 88, for example. Relay OR
the timingrelays at each station then release in 'V
is then held reversed until the timing relays OLI ,
the normal order, qrelay Ll being the last to
1OLP, OLB and OLBP release, relay 0L2 remain
ing energized. ‘Relay OLBP releases relay OM
and opens the counting: and selecting relay cir
cuits. The release of relay OM ‘with relay OR
reversed ‘allows relay PC to pick up. Relay OM
also releases relay OT, and relay PC picks up
relay PCP.
'
'
'
release.‘
,
I
.
7
M
>
-
If an indication code is terminated on aneven
numbered step prior. to the sixteenth'step,v due
to the failure of relay T to pick up; relay OR,
remains normal-until the timing relays 0L2,
OLP, OLB and OLBP release, the closing of back I
At‘ each station, relay R remains released and 50 contact 1‘ of relay OLBP completing-‘a circuit for
operating relay OR to reverse extendingfromiter- -.
the'timing relays release in the same order, relay
minal B at front contact (1 of relay-PCP, back
0L2 remaining energized. Relay LBP opens the
contacts 1" of relays 0L2 and OLBP, front contact I‘
counting-‘and selecting relay circuits to prevent
b of relay PCP, front contact 1‘ of-relay PC and .
the line circuit, but the relays R do not pick up 55 back V contacts e of relays'iX, OM and OT through
' further reception. The release of relay OT closes
relay OR to terminal 0.
because ‘the polarity has been reversed by
lay PC.
~
'
At the transmitting station, relay R remains’
a
When relay PCP picks up, relay OR is operated
to normal over the circuit from ‘terminal 0
picked up and the timing relays L2, LP and LB,
release. 'Relay'LB releases relay M and reverses ,
the connections for relay R So that relay R re,
through its lower winding and back contacts e 60 leases,
reenergizing the timing relays'whichthen;
of relays OT, OM'and X, front contacts 1‘ and b
release in the order Ll , LP, LB and LBP, the ap
- of relays PC and PCP, front contact I of relay
paratus assuming the same conditionas,atthe__
0L2 and back contacts f of relays OLBP and 0L!
other stations where relay R and the timing re- '
to terminal C. The‘ office timing relays are there-‘ 65 lays stand released, with relay R2 picked up. ,,
by reenergized and relay PC‘ is deenergized, relay
PC releasing before relay OLBP’ picks up. The
office timing relays then release in the normal ore
der due to the deenergization of relay 0L2, and
relay PCP also releases, relay OLi being the last 70
to release.
7
.
When relay PC releases it restores the line no
larity to normal so all'the line relays R pick up
in unison, reenergizing their timing relays, and
At the o?ice, relay OR is reversed upon the rev-‘1
lease of relay OLBP, and since the'pick-up cir-l
cuit for relay PC. is closed when its stick circuit .
opens, relay PC ‘remains picked up. The office
timing relays are reenergized and then release
in the order OLI, OLP,'OLB. and'OLBPjrelay
0L2 remaining picked up. Relay OR islrestore’d
to normal upon the closing of back contact I of
relay OLBP over the circuit above traced which
the timing relays at each station then release in '75,in_cludes .front contacts of relays, PC,‘ PCP and.
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