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Патент USA US2116177

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May 3, 1938.
2,116,177
N. p. PRESTON
CENTRALIZED TRAFFIC CONTIiOLLING SYSTEM‘FOR RAILROADS
' 3 Sheets-Sheet
,F‘iled Aug. 24, 1935
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Q21 .Twin
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1
May 3, 1938.
N. D. PRESTON
_
2,116,177
CENTRALIZEOTRAFFIC CONTROLLING SYSTEM FOR RAILROADS
Filed Aug.- 24, 1935
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Fla-.2.
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Mum
INVENTOR
Patented May 3, 1938
V
t
‘UNITED STATES‘ PATENT OFFICE,
GENTR-ALIZED' TRAFFIC. CONTROLLING
SYSTEM FOR RAAILBJOAD‘S
Neil D‘. Preston, Rochester, N. Y., assig-nor to
General Railway Signal Company, Rochester,
-
N. Y.
'
Application August 24, 1935, Serial No. 37,742
4 Claims.
(01. 177-353)
> This invention relates to centralized tra?ic confor registering the code character of the control"
trol systems for railroads, and more particularly ' impulses which is reliable’ in its‘ operation but
to a means for registering controls in a communi- does not require the‘ use of additional‘ decoding
cation system of the multiple impulse or code means.
7
5 type.
‘
Generally speaking; and by way of explanation 5*
In the multiple impulse or code type communication‘ system commonly employed in centralized
tra?ic control systems for the purpose of governing the operation of switches and signals at a
10 distant ?eld station from a central control office,
the controls for governing the operation of the
switches and signals are transmitted by a series
of time spaced plus or minus impulses, or impulses otherwise distinguishable in character by
15"variable line circuit conditions or the like. These
20
and without attempting to de?ne the nature or
scope of the present invention, it is proposed to_
employ neutral stick‘ control relays directly re
sponding in succession to the code character‘ of‘
the control impulses for thesuccessive' steps, these
relays individually or jointly controlling, the op‘
eration of the switches and signals ;' and to con
trol the stick circuits for‘each: of‘ these' neutral‘
stick control relays so as" to be temporarily‘broken‘
while‘ an energizing or pick-up circuit for such 15"
distinctive control impulses are employed to condition suitable relays at the ?eld location governing the operation of power-operated track
switches and‘ the indications of their associated
relay is opened‘ or closed dependent upon the
control impulse being transmitted,‘ said stick cir
cuits maintaining the. control relay energized at
other times to maintain the desired control ef
signals.
fective.
'
In one arrangement, such as disclosed for ex-
ample in- the ‘prior application of Preston and
Hitchcock, Ser. No. 455,304, ?led May 24, 1930,
corresponding to the British Patent ‘No. 377,971‘,
the character of the control impulse for each step
25
or time interval‘5 is registered by operating a two
position polarized relay to one position or the
other, the armature of said relay, conveniently
termed a mag-stick relay, being magnetically
held in; the position to which it is set until
changed by some subsequent impulse. In such
an ‘arrangement, a‘ control impulse to operate
the‘ mag-stick relay from its existing condition
to another desired condition may not be‘ eifec5 tive,. due' to a broken wire or bad contact, or the
like,>with the result that the desired control actually transmitted and received at the ?eld loca-
tion- is not properly registered‘; and while the
system for controlling the switches and signals
40 is‘so organized that‘ no- unsafe condition is p-roduced by such failure, trains may be signalled to
advance lover‘ a wrong route not desired by the
operator. ,
In. another arrangement for registering con45 trols, neutral decoding relays, all de-energized at
the beginning of a transmitting cycle, are selectively energized in. accordance with the control
code transmitted, and then the relays controlling
the switches. and signals are conditioned, pro~
50. vided‘the decoding relays have properly respondedto the control code transmitted. This arrangement requires decoding relays, usually two for
each step, in addition to the switch and signal
control relays.
55, One object of this invention is to provide means
Other characteristic features, attributes, and“
advantages of the organization of relays and’ cir
cuits'constituting the present invention will‘ be
in part apparent, and in part pointed out, as the
description progresses.
The present invention relates‘ to only a part 25
of a complete‘ system of code communication for
centralized traf?c control; and while it is con
temple-ted that the invention will be usedv with
the various features commonly employed‘ or suit
able for such a complete communication sys
tem, such as station selection, transmission of
indications, and the like, in order to simplify the
disclosure and explanation of the present inven
tion, such features of the complete system are 35
not illustrated and will not be described, except
in a general way and in so far as appears to be
necessary to understand the functions and mode
of operation of the parts and circuits constitut
ing this particular improvement.
40
In the accompanying drawings, Fig. 1 illustrates
diagrammatically and with‘ various conventional
illustrations, one form of this invention; Fig. 2
illustrates one typical arrangement of circuits
for operating the stepping relays; Fig. 3 is a dia- 46
gram or chart showing, for explanatory pur
poses, the sequence of operation of certain relays
particularly pertinent to an understanding of the
present improvement; Fig; 4 shows how the or
gani‘zation of Fig. 1 may be used in a multiple 5o
control station system with station selection; and
Fig. 5 shows a modi?ed organization.
For the purpose of simplifying the illustration
and facilitating the explanation, the various re
lays and circuits have been shown diagrammati-i 55
2
2,116,177
cally and conventionally, and the symbols (+)
only intermittently energized closing contact 9
and (—) are employed to indicate connections
to the opposite terminals of a battery or other
suitable source of current for energizing the cir
cuits, instead of showing all of the wiring con
nections that would be employed in practice.
for each impulse to energize relay SA; a group
or bank of stepping relays IV, 2V, etc., including
a half-step relay VP; neutral stick control re
lays WN and WR governing the operation of the
switch machine, and similar relays RD and LD
for governing the clearing of the associated sig
nals; and a special additional relay X for govern
ing the stick circuits of the control relays WN,
WR, etc.
10
Any suitable arrangement of stepping relays
Referring to the drawings, the central control
o?ice of this system is indicated by a dotted rec
tangle in the upper left-hand corner of Fig. 1.
10 The code transmitting and receiving equipment
in this control office is connected to the equip
ment at the various ?eld stations by three line
wires, comprising a stepping and control line wire
SOL, an indication line wire IL, and a common
15 return line wire CL. The stepping and control
line wire SCL, together with the common return
wire CL, constitute a stepping and control line
circuit which is energized in the control o?ice
with a series of impulses of a selected polarity for
20 operating stepping relays at the ?eld location se
quentially one at a time, and conditioning con
trol relays for governing the operation of
switches, signals, and the like. For the purpose
of explaining and understanding the present im
25 provement, it is considered unnecessary to illus
trate the code transmitting equipment in the
control office by which these series of impulses
are applied to the stepping and control line cir
cuit, ?rst in accordance with the code call for a
30 particular control station to be selected, and
then in accordance with the position of switch
and signal levers manually set by the operator
for the purpose of controlling the operation of
corresponding switch machines and signals.
35
It is contemplated that the controls for a
power-operated switch or switches and associ
ated signals will be transmitted as a group to
each of the various control stations, one station
at a time as the operator positions the switch and
may be employed; and the particular stepping
bank illustrated in Fig. 2, and corresponding to
that disclosed in the prior application of T. J.
Judge and C. S. Bushnell, Ser. No. 640,062, ?led
October 28, 1932, is merely typical. Since the cir
cuit organization and mode of operation of this
bank of stepping relays is explained in detail in
said Judge and Bushnell application, and in its
speci?c form constitutes no part of the present
invention, it will be su?icient to point out gen
erally certain characteristic features in the oper
ation of this stepping bank.
During the conditioning period at the begin
ning of an operating cycle, relays F and FF are ‘‘
energized, and thereafter the relay SA, where
upon relay VP is picked up over a circuit that may
be readily traced from (+), through front con
tact Ill of relay SA, front contact II of relay FP,
back contacts I2, l3 and I4 of the stepping re 30
lays 3V, 2V and I, relay VP to (—). Relay VP is
maintained energized by a stick circuit through
its contact I5 and back contacts of the stepping
relays. When the line circuit is broken at the
end of the conditioning period and relays F and 35
FP are de-energized, the ?rst stepping relay IV is
energized by a circuit readily traced in Fig. 2
from (+), through a front contact I6 of relay
SA, back contact I‘! of relay FP, front contact I8 I
signal levers for these control stations and actu
ates corresponding starting buttons, in the man
ner disclosed for example in the application of
of relay VP, and back contact I9 of relay 2V, said 40
station selection, arrangement and grouping of
switch and signal controls, and other features
characteristic of a complete system, incorporating
in Fig. 1, after relay VP is initially energized
during the ?rst energization of the line circuit in
the conditioning period, a stepping relay picks up
during each succeeding ole-energization or “off”
period, and the relay VP shifts, i. e., changes
?rst stepping relay IV, when energized, being
maintained energized through its own front con
Preston and Hitchcock, Ser. No. 455,304, May 24, tact 20 and a stick bus 2| and front contact I6
1930 or T. J. Judge and C. S. Bushnell, Ser. No. of relay SA until the end of the operating cycle.
While relay FF is de-energized, relay VP is held
640,062, ?led October 28, 1932. These applica
tions correspond respectively to British Patent up by a stick circuit through back contact II of
No. 377,971 and U. S. Patent No. 2,082,544. It is relay FP and front contact 22 of relay VP. When
the line circuit is again energized, relay VP drops, I
also contemplated that the controls for a plural
ity of switches or for various routes may be trans~ relay IV being now up. During the next de-en
ergization of the line circuit, the next stepping
50 mitted, either simultaneously during the same
operating cycle, or successively on different oper
relay 2V is energized through back contact I8 of
ating cycles, as best adapted to the particularv relay VP, back contact 23 of‘ 3V, and front contact
track layout. For the purpose of explaining the 24 of IV; and during the next following energiza
nature of the present invention, the various Ways tion of the line circuit, relay VP again picks up to
of communicating controls to several control sta
prepare the energizing circuit for the next step
tions for various track layouts may be disregard
ping relay 3V. The same operation is repeated
ed, and it is sufficient to consider this invention for as many steps as desired.
as applied to a single switch and its associated
Thus, in accordance with the particular ar
signals at one ?eld location.
rangement of stepping relays assumed for the
00
Disregarding the transmission of indications, speci?c embodiment of the invention illustrated (50
the present improvement, and considering this
improvement as embodied in its simplest form,
the ?eld station equipment as shown in Fig. 1
comprises a three-position biased to neutral polar
line relay F in the stepping and control line SCL;
a neutral repeater line relay FP energized each
time the line relay F is energized by closure of
contact 8, irrespective of the polarity of such
energization; a slow-release relay SA picked up
at the beginning of each operating cycle and
maintained picked up during such cycle even
though the line relay F and its repeater FP‘ are
from its energized or de-energized condition as
the case may be, during each of the succeeding
energization or “on” periods.
This operation of the stepping relays IV, 2V,
and 3V establishes sequentially local channel cir
cuits for energizing the control relays WN, WR,
RD and LD in accordance with the polarity of
energization of the line relay F, during the next
“on" period following the “off” period during 75
2,116,177
which the corresponding stepping relay ‘was en-=
ergized.)
-
l
,
y
,
energizing circuit controlled by relay VP and the
stepping relays l V, 2V, etcsare provided. (Remem
beri-ngthat during the energization of the line.
circuit for, conditioning relays WN or'WR, relay
Referring to the control relay WN as ‘typical,
this relay is energized through its upper winding
3 during the first stepping period when the line, V]? is .de-energized, it can be seen that an ener
relay Fis energized with a particular ‘polarity and. gizing circuit for relay X is established ‘from (4-),
relay IV is energized, thisvpolarity in the case of‘ through black contacts 40, ‘4 I of the stepping relays
the relay ‘WN being assumed to ‘be plus to .set the 3V and 2V, front contact 42 of‘ relay IV, back‘
polar contact vof relay ‘F to the right; This ener
contact 43 of relay VP,'.and relay X to (—). This
energization of :relay X supplies current‘to the
to gizingcircuit may be traced from (+-) , polar ‘con
tact .25 of relay Fwto the right, back contacts 26 stick bus 32', and holds up relayWN or ‘WR, ‘as 10;
and 21 “of stepping relays -3V and 2V, front con
the case may ‘be, during the time the energizing
tact, 28 of relay 1 V, through the upper winding circuit for one or the other of these ‘relays is"
of relay WN to (—).
‘
broken at the polar contact 25 of the line relay
Each control relay ‘has a plurality of stick-cir
F‘until line relay repeater FP closes its back 15.
15
cuits for maintaining it energized, if energized, contact 33. Relay X is v‘not energized vuntil relay
underldifferent conditions. One ‘of these stick VP has‘operated following energization of relay
circuits through the slower winding includes a PP, ‘and during this time relay‘WN or WR-pre
back contact of the ‘corresponding stepping Irelay, viously energized will have time'to releaseTits
this stick circuit in the case‘cf relay ‘WNFbeing armature. In this connection, it may be' stated
'readily traced from-(~14), through back contact that the purpose of using the relay X,‘ rather than‘
30 of relay 1 V, front contact 31 of‘relay WN,‘ and energizing the ‘stick bus 32 directly through the‘
lower winding of relay WN to (—).
contacts of relay VP and the stepping relays is to
All of the control relays also have stickcircuits provide an‘ additional relay operating time dur
25, through their upper windings connected toia ‘stick ingwhich the control relay, such as WN may re-‘ 25,
bus 32 ‘which is energized through back contacts lease its armature; and in this respect, the use'of
33 and 34 of relays ‘FF and SA and front contact
35 of relay X in multiple.
‘
"
Each control relay,‘except the‘ 1one ‘controlled
30. on the last step,‘ has a stick circuit through its
lower winding including a front contact of the
stepping relay next succeeding thestepping relay
controlling the energization of such control relay.
In the case ‘of control relay WN, this supple;
35.; mental stick‘circuit may Ibe‘traced from (+),
through front contact 36 of stepping relay 2V,
front ‘contact ‘31 of relay WN, and lower winding
of relay WN to (~-).
‘
'
‘
Considering now the sequence of operation,‘ and '
referring to-Fig. 3 ‘for explanatory purposes,as—
40
‘ sume that the last switch control code was plus
such a'relay X is optional.
“
‘
Following the energization period during which‘
the control relay WN or WR is conditioned, in
accordance with the polarity of such energization, 30:,
as just described, the opening of ‘the line circ‘uit
and de-energization of relays‘ F and FF ‘cause
energization of the next steppingrelay ‘2V, which
closes through its front contact .36 the supple‘
mental stick circuit‘to hold ‘up WN or‘ WR until
the end of the cycle. Relay 2V also opens‘ at its
back contact 4| the energizing circuit 'for relay
X and causes this relay to release its armature
preparatory to‘ the control of another control
relay, such as RD, ‘during the next succeeding 40.
energization period.
t
‘
to energize relay WN ‘and cause the switch‘ ma
chine to assume its normalp-osition, and suppose
steps as desired; and in the same manner as‘
that the operator sets the‘ switch‘lever to the‘
reverse position ‘and initiates‘ the ‘operation of
described a ‘pair of control ‘relays, such‘as WN
or WR, may be selectivelyconditioned on each
lays F, FP, SA, and VP are energized, and-when,
relays F ‘and FF are ‘dc-energized, following this
tion of the steppingand control line circuit. In
conditioning period, the first. stepping relay IV
‘This breaks the ‘stick circuit for
control relay RD is energized by a positive impulse
on the second step, and the signal control relay‘
" relays WN and WR through the back contact '30
LD by a positive impulse on the third step. a This
isno ‘the system. During'the conditioning period,‘re
is energized.
of relay 1V; 'but relay
is de-energized at this
time ‘and the ‘stick ‘bus 32 is energized through
back contact 33 of relay FP to maintain relay WN
55; energized by its stick circuit through its upper
" winding.
When the line circuit is again ‘closed
and energized ‘with a minus polarity correspond
ing to the switch lever in the re‘ver‘se position as
assumed, the energizing vcircuit for ‘relay WN is
contact 25. of the line
not closed, sincethe polar
or’ relay
F moves to the left;
but a similarL‘pick-up
circuit for ‘energizing the-relay WR is established.
When the line relay repeater relay FP picks .up
and opens ‘its back contact’ 33, the stick bus 32
, is de-energized andtthe relay WN releases its
‘
armature.‘
'
'
It can be seen that ‘when the ‘lirie‘cir‘cuit is
opened, after transmission, of‘this control impulse,
the line relay F assumes its de-energized condi
7,10 tion and opens the energizing or pick-up circuit
‘This'same operation is repeated for as‘ many
step in accordance with the polarity'of energize
the particular arrangement illustrated, the signal
arrangement is ‘merely illustrative of how a single
relay may be energized or not on a particular's‘tep
depending upon the polarity of ‘the control ‘im
pulse.‘
1
‘
'
‘
‘~
‘I
‘
Y
The circuits governed by control relays, such as
WN and WE, are preferably organized inac
cordance with this invention, ‘so that a'relay of
each pair-for opposite or conflicting conditions
must be energized whilethe other is de-energizedi 60
in order to produce a controlling conditioiiithere
being no control exercised if ‘both of these relays
are either energized or ?le-energized.
For eX-'
ample, in‘ the particular arrangement illustrated,
the'i‘switch machineSM is'assumed to ‘be con
str‘uctedto respond to‘ the polarity of energiza
ti‘on of’ its ‘control Wires ‘N and B, ‘being pro’
vided‘with‘a polarized master relay :as disclosed,‘
for'example, in the ‘patent to W. K. Howe, No.
1,975,135, granted October 2, 1934. ,
to maintain energized the control relay that was‘
With such an arrangement, if the control relay 70‘
WNis ‘energized and the other controlrelay WR.‘
is de-energized, the control circuit for the'switchl
machine is energized with‘ one polarity‘ior-the
energized by the control impulse, relay Xrandits
normalposition through contacts 46 and “of
“ for relays WN or WR, as the ‘case may be, ‘before
the line "repeater relay F‘P closes its back‘ con~
tact to energize the stick bus ‘32; and in order
4
2,116,177
these relays, and if relay WR is energized while
relay WN is de-energized, the switch machine
control circuit is energized with the opposite
polarity for the reverse position; but if both re
lays WN and WR are either energized or de-ener
gized, the switch machine control circuit is not
energized and the switch machine remains in its
existing condition.
The signal clearing circuits are similarly con
trolled
by contacts on the control relays RD and
10
LD; and these signal clearing circuits are also
controlled by the switch control relays WN and
WR in opposite conditions, so that no signal
‘clearing circuit is established, if both relays WN
15 and WR, or both relays RD and LD, are either
energized or tie-energized. For example, taking
the signal clearing circuit for signal IA as typi
cal, this circuit may be traced from (+), through
back contact 48 of relay LD, front contact 49 of
20 relay RD, front contact 50 of relay WN, back
contact 5| of relay WR, and thence through con
tacts (not shown) of a suitable point detector or
switch position relay closed only if the switch
points are over and locked ‘m the corresponding
25 normal position, with such other control of the
clearing of the signal in accordance with traffic
conditions, as may be desirable in accordance
with the common, practice in signalling systems
of this character, such control of the signals in
30? accordance with the positions of the switch point
and the like being omitted.
In the particular arrangement shown, the pick
up and stick circuits for the signal control relays
LD and RD include a front contact 52 of the de
tector track relay T, in multiple with a back con
tact 53 of the slow-release repeater TP of this
track relay, in the manner characteristic of the
disclosure in other prior applications, such as
R. F. Wells, Ser. No. 634,370, ?led September 22,
I932, so that the passage of a train de-energizes
the relay LD or RD to cause the signals to assume
the stop condition and remain at stop until
cleared by some subsequent code, while permit
ting energization of these relays by a signal clear
ing
code while the detector track circuit is occu
45
pied. Either signal control relay LD or RD, if
energized to clear a signal, may be de-energized
by the operator by sending a control code having
an impulse on the respective steps controlling re
lays RD and LD of a polarity which does not close
50 the energizing circuits for these relays.
From the foregoing it can be seen that, in ac
cordance with this invention, the control relays
governing the switch machines and signals at a
?eld location are directly responsive to the char
acter of the successive code impulses, and are se
lectively energized or de-energized successively as
the impulses of the control code are transmitted,
so that no additional decoding relays are required
to register the control code step by step as trans
60 mitted prior to the conditioning of the switch and
signal control relays. Even though the control
relays are thus directly controlled, each control
relay is positively rendered dependent upon the
character of the corresponding control impulse,
65 because it is a neutral relay and assumes its de
energized condition when its stick circuits are
broken, unless an energizing or pick-up circuit is
established. If such energizing or maintaining
circuit for any control relay is not established on
70 account of broken wires or bad contacts, such
ling condition of the ?eld equipment, rather than
some controlling condition different from that
transmitted.
Also, in accordance with this improvement, the
pick-up or sustaining circuit for each control re
lay is established before its stick circuits are
broken, so that a control relay does not release its
armature even temporarily if the same control
code is repeated. This feature is desirable, par
ticularly in connection with the signal control re 10
lays RD and LD, because a temporary de-ener
gization of one of these relays upon a repetition
of the same signal clearing code might give a stop
indication to confuse the engineer of an ap
proaching train, particularly if color light signals 15
are used.
In the organization of Fig. 1, just described, it
is assumed that the desired controls are trans
mitted on each operating cycle for governing the
control relays WN, WR, RD and LD illustrated,
but in applying this invention to a multiple sta
tion system of the so-called duplex type, such as
disclosed for example, in the application of
Preston and Hitchcock, Ser. No. 455,304, ?led May
24, 1930, there are conditions under which the 25
?eld station apparatus, including the stepping re
lays, operates at a time when the proper controls
for covering the control relays WN, WR, etc. are
not applied to the stepping and control line cir
cuit. Under such circumstances, it is necessary 30
to provide means for holding the control relays
WN, WR, etc. in their existing condition, except
when controls are being transmitted to the par
ticular control station in question; and such an
arrangement is illustrated in Fig. 4.
Referring to Fig. 4, it is contemplated that a
relay or relays, such as the relay S0, is energized
when controls are being transmitted to the par
ticular control station for governing the control
relays WN, WR, etc. The speci?c type of station
selecting or identi?cation means is not material
to the present invention; and the station selecting
relay S0‘ for out-bound controls shown in Fig. 4,
which is assumed to be governed in the manner
disclosed in the above mentioned Preston and 45
Hitchcock application, Ser. No. 455,304, is merely
typical.
Assuming such a suitable station selecting or
identifying relay SO as shown in Fig. 4, the stick
bus 32 for the control relay WN, WR, etc. is
energized through a back contact 55 of this re
lay SO, and is connected to the bus wire 321
extending to the contacts 33, 34 and 35 of the
relays FP, SA, and X. Also, the energizing 'cir
cuits for the control relays WN, WR, etc. through
the polar contact 25 of the line relay F includes 55
the'front contact 55 of the relay SO. During
the station selecting steps, during which the con—
tinued energization of relay S0 is determined,
control relay WN or WR, as the case may be,
is maintained energized by its stick circuit
through the back contact of the stepping relay
aV, corresponding to stepping relay IV of Fig.
1. Control relays RD and LD, and such others
as may be employed, are similarly maintained
energized by the stick circuits through the back 55
contacts of the corresponding stepping relays bV,
cV, and the like. If the control station in ques
tion is not called to receive new controls, relay
S0 is de-energized when the stepping relays aV,
bV, etc. are operated, and the control relays WN 70
control relay assumes its de-energized or non
and WR are maintained in their existing con
controlling condition, rather than remaining in
the condition where last put. Consequently, cir
dition by their stick circuits energized from the
stick bus 32, and no current is supplied to their
75 cuitfailures produce an inactive or non-control
energizing circuits since the front contact 550i 15
When the station is called to
establishing an energizing circuit for relay WR,
receive new controls, however, relay SO‘is ener
g‘ized at the time the stepping relay (W and the
others for the ‘control steps are energized; and
relay S0 is open.
and at the same time interrupting the supply of
current to the stick bus 13. Relay WN then
under these conditions current is supplied to the
polar ‘ contact 25 of the line relay F, and the ener
gization‘of the stick bus 32 is controlled by relays
FP, SA, and X, so that the control relays WN,
WR, etc. are set‘or conditioned in accordance
with the control code in the same manner al
ready described.
Fig. 5 illustrates a modi?cation in which the
line relay F1 and the stepping relays aV, bV, etc.
are equipped‘ with, special make-before-break
or continuity contacts in such away as to simpli
fy the circuit organization as illustrated in Fig.
1. The"arniature 60 of the line relay F1, pivoted
at‘ its center, and biased by a spring 6| to the
its de-energized position, after the transmission
of the control impulse in question, its contact 10
?nger 64 energizes the stick bus 14 and the stick
circuit for relay WR now up, before the energiz
ing circuit for relay WR is broken, clue to the
make-before-‘break construction of the‘contacts
associated with said contact ?nger 64. During 15
this de-energ'ization period, the next stepping re
lay bV is energized, and in this modi?cation the
stick circuit for the next preceding step relay
aV includes a back contact 15 of the stepping re
rocked and/moves a contact driver 62 to the right
nately shifted‘ from‘the position shown to a dotted
line position by the driver 62 as the line relay is
energized with current of opposite polarity, and
open and close contacts suitably constructed, as
lay bV, so that stepping relay av drops and closes
the stick circuit for relay WR at its back contact
73, this stick circuit being closed prior to the
interruption of ‘the ‘stick circuit to the stick bus
74, due to the make-bBfore-break construction of
‘these front and back contacts. ‘This same plan
of operation takes place for as many ‘steps as
indicated diagrammatically, to be make-before
‘desired.
break. Other contact ?ngers 65 supply current
to the line relay repeater FP whenever the‘ line
a relay F1‘ is energized with current of either polar
ity.
‘The control relays WN, WR, and ‘such
others as vrnay be used, have pick-up or energiz
ing circuits through their lower windings, which
are supplied with current through the contact
as ?ngers 6'3 and 64, with relay SO energized and its
front contact 66 closed, when the polar line re
lay‘ F1 is “energized, in substantially the same'way
as shown in Fig. 1. The energizing circuit‘ for
'
The modi?cation of Fig. 5 employs make-be
fore-break contacts on they polar line relay and
on the stepping‘ relays, so as to obtain‘the de
sired overlapping ‘or continuity of the pick-up
and stickci‘rcuits for the control relays, rather
than dependent upon the sequence of relay op~
eration as in the arrangement of Fig. 1. This
modi?cation of Fig. 5 has the various character
,
istic features and advantages already explained
for the arrangement shown in Fig. l, the ‘control
relays being set or conditioned, if‘ at all, in ac
WN, for example, may be traced from (-1-) , front
co‘rclan‘ce“ with'the control impulse actually‘r'ee
63 in the energized dotted position, wire 69, back
ceive‘d,rwithout relying upon the integrity of any “a
circuit, so that broken wires and‘bad contacts
to contact ‘65 of relay SO, wire 61, contact ?nger
' contacts ‘Ill and ‘II, of stepping relays 0V and 12V,
front contact‘ 12 of stepping relay aV, lower
winding of relay WN to- (—-).
45
upper winding being broken at the contact 64 of
line‘ relay F1, and the energizing circuit through
its lower winding being opened at the contact 63
of said line‘ relay. When line relay Fl assumes
intermediate de-energized position‘ shown, is
‘or left, dependent upon the polarity of energiza
tion. Spring contact ?ngers 63, 64 are alter
a
‘releases its‘ armature, its stick circuit through its
The two control relays for each step, such as
WN and WR, have stick circuits including a back
contact, as 13, of the corresponding stepping
relay; and this contact of the stepping relay has
a make-before-break front contact connected to
a stick bus 14. When the station is not being
called and relay S0 is de-energized, this stick
bus 74 is permanently energized through the back
contact 66 of the relay SO. When the station
is being called, this stick bus is energized through
55 the front contact 66 of relay SO, wire 61, contact
?nger B3 of relay F1 in the de-energized position,
wire 68, and contact ?nger B4 in the de-energized
position.
Considering the operation of this modi?cation
shown in Fig. 5, assume that relay WN is ener
gized, and that an impulse of opposite polarity is
transmitted to the particular station in question
on step aV for the purpose of de-energizing
relay WN and energizing relay WR. During the
65 de-energization period of the line circuit next
preceding the control impulse in question, the
stepping relay aV is energized, breaking at its
back contact 13 the stick circuit for WN, but
simultaneously connecting this stick circuit to the
70 stick bus 14, which at this time is energized
through contacts of the line relay F1 and front
contact 66 of relay SO. When the impulse of the
selected polarity in question is applied to the line
circuit and line relay F1 is energized, its contact
75 ?nger 64 moves to the left in the case assumed,
produce ‘a' non-controlling condition, rather than
a controlling condition inconsistent with the con
trol received. In this connection, it may be
pointed out that in both of the arrangements 45
of Figs. 1 and 5, if the line relay during a given
stepping interval should, for any reason, due to
line surges or the like, shift its contacts quickly
from one position to the other and simulate the
condition of con?icting controls, the simulta 50
neous energization of the pair of control relays
for that step, such as relays WN and WR by such
improper double controls, if this should occur,
is a non-controlling condition.
Various adaptations, and modi?cations may 55
be made in the particular arrangement of de
vices and circuits shown and described as ex~
emplifying the invention, without departing from
the fundamental functions and advantages of
the invention; and means for receiving or reg 60
istering controls in a centralized traf?c control
system, in accordance with this invention, may
be employed in conjunction with various other
features of a complete system.
What I claim is:—
1. In a remote control system of the multiple
impulse or code type, an organization for regis
tering controls transmitted to govern the oper
ation of movable devices comprising, line wires
for transmitting a series of code conditions each
controllable in character, step-by-step means op
erable to take one step for each code condition,
a pair of neutral control relays associated with
a particular step and each having energizing cir~
cuits, means for selectively energizing the en
6
2,116,177
ergizing circuit for one or the other of said con
trol relays on said particular step dependent
upon the character of the code condition for that
step, ?rst and second stick circuits for each of
said control relays, means for opening said ?rst
stick circuits only while said step-by-step means
is operated for said particular step, and means
for energizing said second stick circuits while
said step-by-step means is thus operated for said
10 particular step except for a time while one of
said energizing circuits is closed.
' 2. In a remote control system of the charac
ter described, line wires energized distinctively
to provide code impulses of different characters,
a series of stepping relays, means for sequen
tially energizing said stepping relays one at a
time for successive energizations of said line
wires irrespective of the character of the im
pulses, a pair of neutral control relays associ
20 ated with a particular step, means for energiz
ing said control relays selectively in accordance
with the character of the code impulse being
transmitted, means for maintaining said control
relays energized at all other times except while
25 they are being thus conditioned in accordance
with the character of the code impulse then be
ing transmitted, and circuits governing the op
eration of a movable device closed only if said
control relays are in opposite conditions of ener
30
gization and de-energization.
3. In a remote control system;
a stepping
and control line circuit selectively energized with
a series of positive and/or negative impulses; a
polar line relay included in said line circuit; a
35 neutral line repeating relay energized each time
said polar line relay is energized irrespective of
the character of the impulse; a series of step
ping relays, means for energizing said stepping
relays sequentially, one each time said line re
peater relay is deenergized; a pair of control
relays for each step; an energizing circuit for
each control relay including a front contact of
the corresponding stepping relay and a partic
ular polar contact of said polar line relay so that
one or the other of a pair of control relays is en
ergized, while their stepping relay is picked up,
dependent upon the polarity of the impulse then
energizing said polar line relay; stick circuit
means for maintaining said control relays ener
gized, if picked up, at all times except a portion
of that time while they are being conditioned in
accordance with the polarity of the impulse
transmitted while their respective stepping re .10
lays are picked up; electro-responsive means for
each pair of control relays; and circuit means
governing the operation of each electro-respon
sive device closed only if its said pair of control
relays are in opposite conditions of energization 15
and d'eenergization.
4. In a communication system of the remote
control type; a line circuit having different se
ries of time spaced characteristic impulses trans
mitted thereover; a line relay included in said 2,0
line circuit; step-by-step means controlled by
said line relay to take one step for each of said
impulses; a pair of control relays associated with
a particular step; ?rst and second stick circuits
for each of said control relays; means controlled 25
by said step-by-step means for opening said ?rst
stick circuits during said particular step and at
other times closing such stick circuits; means ef
fective while an impulse is being transmitted
during said particular step for momentarily 30
opening said second stick circuits; station iden
tifying means rendered effective. only during par
ticular ‘ones of said di?erent series of impulses;
means controlled by the character of the im'
pulse during said particular step, only if said 35
station identifying means is rendered effective,for
selectively energizing one or the other of said
control relays during the time that both said
?rst and second stick circuits are opened; and
means controlled by said station identifying 40
means, while rendered ineffective, for maintain- ‘
ing said second stick circuits closed.
NEIL D. PRESTON.
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