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Патент USA US2082180

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Jun_e '1, 1937.
2,082,180
W. T. POWELL
CENTRALIZED TRAFFIC CONTROLLING SYSTEM FOR RAILROADS
Filed Feb. 14, 1934
HAIETU?!
rl L
INVENTgb
. Z00.‘
“3.5 6
ATTORNEY
2,082,180
Patented June 1, 1937
OFFICE
STATS
2,082,180
CENTRALIZED TRAFFIC CONTROLLING
' SYSTEM FOR- RAILROADS
Winfred T. Powell, Rochester, N. Y., assignor to
General Railway Signal Company, Rochester,
N. Y.
Application February 14, 1934, Serial No. 711,175
23 Claims.
This invention relates to centralized tra?‘ic con
trolling systems for governing traffic on rail
roads and more particularly to the interrelation
of the communication part of such a system with
5 the trai?c controlling devices which are super
vised thereby.
In a centralized tra?ic controlling system of
the type contemplated by this invention, com
munication is established between a central con
10 trol o?ice and a large number of outlying ?eld
stations by means of a station selective coded
type of communication system. In a communi
cation system of this type a plurality of series of
impulses of di?erent code combinations are trans
15 mitted over the line circuit connecting the con
trol o?ice and the ?eld stations. The ?rst part
of each different series of code combinations is
employed for the selection of the station. The
later part of each different series of code com
20 binations is employed to control the traf?c con
25
30
35
40
trollingdevices at the selected station.
The present invention pertains more particu
larly to the ‘manner in which the later part of
each different series of code combinations func
tions to control the controlling devices at the
station. More speci?cally a track switch is gov
erned in accordance with the conditions of switch
control relays. Similarly the signals are gov—
erned by signal control relays which establish the
direction, but the particular route over the track
switch for such direction is dependent upon a
selection which requires that the signal and
switch control relays are in correspondence.
These switch and signal control relays receive
their selective energizations in accordance with
the distinctive character of the impulses com
prising the later part of each series of code com
binations. The switch and signal control relays
are of the neutral type, one for positioning the
switch machine to normal, one for positioning
the switch machine to reverse, one for clearing
signals for east bound traffic (right direction),
one for clearing signals for West bound traffic
(left direction) and two for putting all signals to
45 stop.
An important feature of the present invention
relates to the impulse check arrangement, where
by the recording or the reception of an extra im
pulse due to a surge or the like on the line at any
50 step of the later part of a series, or the failure to
record an impulse at any of these steps cancels
or annuls the record for that cycle. This results
in the tra?ic controlling devices remaining in
55 their former positions instead of being changed
(Cl. 246-3)
to undesired positions due to an improper code
being received.
More speci?cally the code (+) (_+) (-) is
used to actuate the track switch to normal and
to clear the signal for east bound trai?c. If the
first impulse is not recorded or if both a (+)
and a (--) is recorded on the ?rst step the switch
machine is not operated and the signal is not
cleared. If the second impulse is not recorded
then the third impulse serves as a check, that is, 10
if it is (—-) the east bound signal is cleared but
if it is 0 (no impulse) then no signal is cleared.
If the ?rst two impulses are properly received
(+) (+) and a (+) and a (—) are recorded on
the third step, or if no impulse is recorded on the 15
third step no signal is cleared. If thecharacter
of the second’ impulse changes from (+) to (-)
or the third changes from (——) to (+) the code
plan is such that the signals will all be put to
stop rather than a wrongysignal being cleared.
0
This same check scheme is e?ective forv other
combinations as will be pointed‘ out in detail
later.
.
p
r
,
I
.
Other features of the present invention reside
in the various circuit arrangements which are
particularly adaptable for systems of this type.
In describing the invention in, detail reference
will be made ‘to the accompanying drawing in
which the various parts are designated by suit
able reference characters.
This drawing illus- 3O
trates diagrammatically the apparatus and cir
cuits provided in accordance with the present in
vention at a typical ?eld station for the control
of a single track switch and the signals for gov
erning tra?ic thereover.
35
For the purpose of simplifying the illustration
and facilitating in the explanation, the various
parts and circuits constituting the embodiment
of the invention have been shown diagrammati
cally and certain conventional illustrations have 40
been employed. The drawing has been made
more with the purpose of making it easier to un
derstand the principles and mode of operation,
rather than with the idea of illustrating the
speci?c construction and arrangement of parts 45
that. would be employed in practice. For ex
ample, the various relays and the contacts are
illustrated in a conventional manner with sym
bols employed to indicate the connections to the
terminals of batteries or other source of direct 50
current instead of showing all the wiring con
nections to these terminals. ’ The symbols (+)
and (-—) are employed to indicate the positive
and negative terminals respectively of suitable
batteries or other sources of direct current and 55
2
2,082,180
the circuits with which these symbols are used
always have current ?owing in the same direc
tion.
Communication system in generaZ.-A central
ized tra?ic controlling system in which the pres
is selected, the remaining impulses of the cycle
ent invention is more particularly useful con
sists of a control office and a number of outlying
pulses of the cycle are ineffective to establish
control conditions.
?eld stations. Communication is established be
tween the control oi?ce and the ?eld stations for
10 the transmission of controls for governing the
tra?ic controlling devices at such stations and for
the transmission of indications to give the opera
tor in the control o?ice information as to the
location of trains and the response of the various
15 trai?c controlling devices. This communication
is established over a station selective coded type
communication system, in which a small number
of line conductors is employed and in which the
selective communication between the o?ice and
20 any particular station, either for the transmis
sion of controls and/or the transmission of indi
cations, is established by the transmission of
suitable codes.
For the purpose of illustrating the present in
are effective to establish the proper control con
ditions.
At those stations where the ST relays
are not energized at the end of the station se
lecting portion of the cycle, the remaining im
For the transmission of indications to the
control office, only one ?eld station is rendered
eiiective to transmit over the indication line cir 10
cuit during any particular cycle‘. That par-4
ticular station which is rendered effective, is
selected by means of some suitable lockout ar
rangement. In any event, this selection of a
?eld station for permitting it to transmit indica
tions is made eifective at such station by the
continued energization of its selecting or lockout
relay throughout the cycle of operations, but
since this particular portion of the system is
immaterial for an understanding of the present
invention the circuit arrangements relating to
the transmission of indications are omitted.
Field station apparatus-The ?eld station in
cludes, besides the line relay F above mentioned,
25 vention it is considered unnecessary to illustrate
a neutral line repeating relay FP of the quick
the apparatus in the control o-?ice for applying
acting type, which is energized each time line
relay F‘ is energized, irrespective of the polarity
of energization of relay F.
A slow acting neutral relay SA is picked up
at the beginning of each cycle and is dropped
at the end of each cycle, although it is energized
only during the successive energizations of the
control line circuit as repeated by relay FP.
a plurality of a series of different code combina
tions to the line circuit in accordance with the
positions of code jumpers and control levers
and it is also considered unnecessary to illustrate
the reception of code combinations transmitted
from the ?eld stations to the control o?ice. It is
assumed that a system for these purposes may
be of any suitable character such for example as
35 shown in the application of T. J. Judge, et al.,
Ser. No. 640,062, ?led October 28, 1932, corre
sponding to British Patent 419,399.
It is considered su?icient for an understanding
of the present invention to merely illustrate how
40 the control code part of each series of impulses
results in the control of the traflic governing
devices at a particular station and to indicate the
relation of the apparatus shown with the rest of
the apparatus of a complete system.
With reference to the accompanying drawing
a control of?ce has been merely indicated by a
dotted rectangle. The control o?ce is connected
to the ?eld station by three line wires, including
a control line I9, an indication line l2 and a
common return line hi, it being understood that
these lines extend from the o?ice to each of
the ?eld stations of the system. The line wires
l0 and I2, together with the common return line
wire M are so employed as to complete two line
circuits namely, a control line circuit and an
indication line circuit. The control line circuit
is for the transmission of impulses of selected
polarity from the control office to the ?eld sta
tions and includes at each ?eld station a three
60
acting characteristics.
In addition to the station relay ST above men
tioned, a station stick relay STS is provided for
checking the condition of the control apparatus
at the start of a cycle, that is, if the control
relays are all in their normal, de-energized posi
tions at the start of the cycle relay STS will be
picked up to connect these control relays to the
control buses for receiving the coded impulses.
If one or more of the control relays is picked up
at the start of a particular cycle then relay STS
cannot be picked up, with the result that no
control code except the stop code can be received
during this cycle.
The ?eld station includes a stepping relay
bank which takes one step for each de-energized
condition of the control line. Although the
stepping relays have been indicated as being
picked up during the de-energized periods of the
control circuit, so that the energized condition
of the control line circuit may be directly ex
ecuted or stored .on each step, it is understood
that these operations can be reversed if desired.
.A slow acting last step relay LV is indicated
as being operated in conjunction with the other
position, polar, biased-to-neutral, line relay F.
stepping relays of the bank, this relay being 60
The transmission of a series of distinctive im
pulses over the control line circuit results in the
picked up on the last step of the cycle. Due
to its slow acting characteristics it is not dropped
at the end of the cycle until a period of time
has been measured off after the other stepping
step-by-step operation of a stepping relay bank
at each station, irrespective of the character of
impulses, while the character of the impulses
determine the particular ?eld station to be se
lected. A station relay ST at each station is
energized after the reception of the station se
lecting portion of the code combination which
70 corresponds to the station at which this station
relay is located. Relay ST corresponds to and
may be considered as being operated in the same
manner as station relay $01 of the above men
76
This is because relay SA has the proper slow
tioned Judge et al. application.
At the particular station where the relay ST
relays have been de-energized.
Although the ?eld station is illustrated as
including but a single track switch TS it will be
understood that any number of track switches
may be similarly controlled at a ?eld station.
Track switch TS is operated from one extreme
locked position to the other by a suitable switch
machine SM which may be of any suitable type
known to those skilled in the art.
Associated with the track switch and the
switch machine, a switch box or point detector
3
2,082,180
contacts (not shown) are provided for control
ling a switch position repeating relay. This
switch repeating relay is not shown but it may
be of the polar neutral type for repeating the
5 position and the locked or unlocked condition of
the track switch in a manner familiar to those
skilled in the art.
Suitable signals lA-iB and 2A-2B are pro
vided for governing tra?ic over the track switch
10 according to the usual practice. Although these
signals have been illustrated as of the color light
type, they may be of any other suitable type
governed in accordance with the present inven
tion. These signals are normally at stop but are
15 cleared whenever their corresponding signal con
trol relays (not shown) are energized, subject
to the usual automatic block protection. Such
control has been indicated in the drawing by
conductors RW, NW, RE“. and NE; leading to the
20 bracket which indicates that these conductors
are connected to signal control relays for clearing
signals 2B, 2A, H3 and IA respectively. It will
be understood that these signal clearing circuits
are governed in accordance with the position of
25 the switch repeating relay and also in accord
ance with tra?ic conditions in advance, all of
while detailed consideration will be given the
‘later or control code part of each diiTerent series
of impulses.
tive or a negative impulse for each step the '
number of possible code combinations is equal
to two raised to the power of the number of
steps. In the present illustration the ?rst two
steps have been employed for the station selec
tion part of the code. The next three steps 10
(3, 4, and 5) have been employed for the con
trol codes and with the impulses for these three
steps arranged in code combinations, eight dif
ferent codes may be formed as illustrated in
the table given below.
Table of control codes
Code no.
First
step
acting relay TP is provided for directly repeat
been provided. With relay W’N energized and
relay WR de-energized the circuits are so ar
40
ranged that the switch machine will be operated
to its normal locked position. With relay WR
energized and relay WN de-energized the switch
machine will be operated to its reverse locked
position. With these relays both energized‘or
both de-energized the circuits are so arranged
' that the switch machine circuits are not ener
gized for operating the switch machine in any
manner.
Code use
+
+
+
+
+
—
Switch
east.
normal,
signals
+
—
+
Switch
normal,
signals
_
—
Not used.
I
Switch normaLsignals stop.
west.
-
+
+
Switch reverse, signals stop.
—
+
-—
Switch
—
~
+
Switch
—
Not used.
reverse,
signals
reverse,
signals
cast.
standing of the present invention.
ing the track relay Tfor purposes that will be
later pointed out.
35
For the purpose of controlling the operation
of switch machine SM, two switch machine con
trol relays WN and WR of the neutral type have
Second Third
Step
Step
+
which need not be shown for a proper under
The track switch TS also has associated there
30 with the usual detector track section, having the
usual track battery and track relay T. A slow
_
With the possibility of having either a posi
>
~
we
.
30
More speci?cally there is a group of control
levers in the control oiiice for each ?eld station.
The positioning of the levers for a particular sta
tion, followed by the actuation of suitable means
to initiate the system, causes the transmission of
a series of impulses comprising the code call for
that station and the control code for operating
the switch and controlling the signals at the
selected station.
Following the transmission of the station code
that there is a signal control lever and a switch >
control lever, thus requiring three successive im
pulses to make the required combinations, as
The direction of tra?ic over the track switch
is determined by the direction control relays LD
illustrated in the above table. It will be under
stood that the headings in this table, ?rst step,
"0 and RD, only one of which may remain up at
any one time for controlling the signals. The
second and third steps (3V, 4V and 5V) after
,
particular route for the direction selected by
these relays is determined by the position of the
_, switch control relays WN and WR and as above
‘3" mentioned in correspondence with the switch
repeating relay (not shown).
Various other apparatus and devices for the
?eld station includes a change relay, indication
determining contacts and the like, all of which
‘59 have been omitted for the purpose ofsimplify
ing the present disclosure.
It is believed that further characteristic func
tions and features of the invention will be best
understood by considering various typical opera
65 tions of the present embodiment.
Operation
As above mentioned the ?rst part of each dif
ferent series of impulses forms a combination
second step, and third step refer to the ?rst,
station selection.
7
It is assumed that these codes are transmitted
when the control levers are in their proper posi
tions to give the desired controlling conditions at
the ?eld station as assigned to each code com
bination in the table. For example, if the switch
lever is in a normal position and the signal lever
is in an east clearing position, the second code will
be transmitted consisting of (+) (+) (——). This
code is e?ective to position the track switch TS
in a normal‘position and to clear east bound sig
nal IA.
Station selection and step-by-step operati0at.—
At the beginning of a cycle of operations relay 1''‘?
is energized by polar contact ll of relay F in
either a right or a left hand position, depending
upon the polarity with which line relay F is
energized. .The closure of front contact I3 of
To that may be termed a station code call for the
selection of a particular station, while the later
part of each di?erent series forms a combina
relay FP energizes slow acting relay SA, which
tion for controlling the various devices at the
selected station. Consideration of the station
the expiration of an interval of time after the
75 code calls will be given only general mention,
40
call, the control code is impressed upon the con
trol line circuit as determined in accordance with
the positions of the control levers for the particu~
iar station. In the examples chosen it is assumed
picks up after a short interval of time, remains
picked up throughout the cycle and v‘drops after
control line has been de-energized at the end
' of the cycle.
(it)
2,082,180
Upon the ?rst de-energization of the control
line, as repeated by relay FP following its ?rst
energization (relay SA being picked up) , the ?rst
stepping relay is picked up and similarly. during
each following de-energized condition of the con
selected by the energization of relay ST, the con
Code No. 1.—The (+) impulse received on the
?rst step positions relay F to the right for clos
ing a circuit for picking up relay WN extending
trol steps are then taken by stepping relays 3V,
from (+), front contact I6 of relay ST, contact
trol line circuit a succeeding stepping relay is
picked up, so that after the station has been
10 4V and 5V.
After the station is selected by the
picking up of relay ST, the succeeding impulses
I? of relay F in its right hand dotted position,
back contacts l8 and IQ of relays 5V and 4V
in the control line circuit are effective to energize
the control buses by way of contact I l of relay F,
as determined by the polarity of the impulses re
ceived from the line circuit. .These buses have
respectively, front contact 30 of relay 3V, l+
bus, front contact 40 of relay STS and winding
been given reference characters 6+, 2+, |-, 2_,
tact 1H of relay STS, front contact 42 and wind
ing of relay WN' to (—). It will be understood
that relay STS is de-energized at the end of the
cycle when relay ST opens its front contact 20
to de-energize the stick circuit of relay STS.
The (+) impulse received on the second step
closes a circuit for de-energizing relay LD which
extends from (+), front contact l6 of relay ST,
contact I‘! of relay F in its right hand dotted
position, back contact I8 of relay 5V, front con
3+, 3— to indicate that they are energized with
the polarity indicated at the step indicated by
20
relay T. It will be noted that the picking up of
both relays RD and LD is ineffective to close any
signal clearing circuits because back contact 38
of relay LD is open and back contact 39 of relay
RD is open.
the preceding numeral.
Normal conditions.—As previously mentioned
the detector track section associated with the
track switch is of the normally closed track cir~
cuit type, so that the track relay T is normally
energized as is readily understood. With the
25 front contact 3! of relay T closed, an obvious en
ergizing circuit for its repeating relay TP is
closed. It will also be understood that the red
or stop indicators of the signals IA—!B and
2A—2B are energized under normal conditions‘,
30 since all signals normally indicate stop.
It will be assumed that the last previous opera
tion of the system was the reception of a stop
code, so that all of the other relays shown on the
drawing are in their normal conditions.
Reception of control impulses-Jr“ the character
of the ?rst impulse is positive, then the normal
switch machine control relay WN is energized,
while if the character of the ?rst impulse is nega
tive the reverse switch machine control relay WR
110 is energized. At the ?rst step of the cycle cir
cuits are closed for energizing both signalrelays
RD and LD, then if the character of the second
impulse is positive relay LD will be (is-energized
and relay RD will remain energized. If the
character of the second impulse is negative relay
RD will be de-energized and relay LD will'rernain
energized. If the character of the third impulse
is positive relay RD will be de-energized and if
the character of the third impulse is negative
relay LD will be de-energized.
More speci?cally, as soon as thestation is se
lected relay ST is energized and closes a circuit
for picking up relay STS extending from (+),
front contact 29 of relay ST, back contact 2| of
55 relay WR, back contact 22 of relay WN and
winding of relay STS to (—). Relay STS closes
a stick circuit for itself extending from (+),
front contact 20 of relay ST, front contact 23 and
winding of relay STS to (—). .Relay ST, at its
60 front contact it, connects (+) to contact ll of
relay F, so that the following impulses will be
effective to energize the code conductors in the
various combinations presently to be explained.
With relay STS picked up a circuit is closed for
65 picking up relay RD (when the third step is
taken) which extends from (+), back contact
24 of relay llV, front contact 25 of relay 3V, front
contact 26 of relay STS and upper winding of
relay RD to (—). A circuit is closed for picking
70 up relay LD which extends from (+), back con
tact 2? of relay 4V, front contact 28 of relay 3V,
front contact 29 of relay STS and upper winding
of relay LD to (—). Relays RD and LD close
stick circuits for themselves including their front
75 contacts 35 and 36 to (+) at front contact 3110f
of relay WN to (—).
Relay WN closes a stick
circuit for itself extending from (+) , front con
15
tact IQ of relay 4V, 2+ bus, front contact 46
of relay STS, front contact 41 and lower winding
of relay LD to (——). Since relay LD has its
upper winding energized in the direction indi
cated by the arrow associated with this winding 30
and since the last traced circuit energizes its
lower winding in the direction of the arrow asso
ciated with this winding, the relay will be de
energized because of the neutralizing effects of
these two windings on the armature.
The reception of impulse 3+ closes a circuit
for dewenergizing relay RD in a manner similar
to that explained in connection with relay LD,
which circuit extends from (+), front contact
E6 of relay ST, contact I’! of relay F in its right
hand dotted position, front contact I8 of relay
5V, 3+ bus, front contact 48 of relay STS, front
contact 49 and lower winding of relay RD to (-—) .
With relays RD and LD de-energized there is
no circuit closed for clearing any of the signals,
because front contacts 38 and 58 of relays LD
and RD respectively are open. Since relay ST
drops before relay STS, the stick circuit of relay
WN is maintained energized at back contact 20
of relay ST so that relay WN remains picked up.
The switch machine is now operated to its nor
mal position over a circuit extending from (+),
front contact 53 of relay WN, back contact 44
of relay STS, normal operating wire N, switch
machine motor, reverse operating wire R and U! iii
back contact fili'of relay WR to (—). The above
described code is one that is conveniently used
when all signals vare at stop, for operating the
switch- machine to normal without clearing a
signal._ This is of advantage in clearing the
switch of obstructions due to ice and the like.
Code N0‘. 2.—The number |+ impulse of this
code is eifective to pick up relay WN and this
relay is stuck up in the manner previously de
scribed. The number 2+ impulse is effective to
kick down relay LD as above pointed out. The
number 3- impulse is ineffective, since the cir
cult of this code bus extends through front con
tact 59 of relay STS to the same contact (41)
on relay LD as used by the 2+ impulse for de~ 70
energizing this relay. Therefore impulse 3- is
ineffective with the result that the end of the
cycle is reached with. relays WN and RD ener
gized. The dropping of relay STS closes its back
contact 44. for ‘operating the switch machine 75
5
2,082,180
to its normalv position by way of front contact
contact 60 of relay WN and reverse west conduc
43 of relay WN. A circuit is now closed for clear
ing signal IA which extends from (+) , ‘back
contact 38 of relay LD, front contact 58 of relay
RD, back contact 59 of relay WR, front contact
57 of relay WN and normal east conductor NE‘ to
tor RW to signal 2B.
signal EA.
Code No. 3.-—The 9+ impulse is e?ective as be
fore to operate the switch machine to its normal
10 position when relay STS drops at the end of the
cycle with relay W'N picked up.
The 2 impulse
closes a circuit for de-energizing relay RD which
extends from (+), front contact 16 of relay ST,
contact ll of relay F in its left hand dotted po
sition, back contact 32 of relay 5V, front contact
33 of relay 4V, 2—— bus, front contact 56 of relay
STS, front contact 49 and lower winding of‘ relay
RD to (—).
circuit.
Relay RD is kicked down by this
The 3+ impulse is ineffective since front
contact 49 of relay RD is now open.
Signal ‘2A
is cleared over a circuit extending from (+) ,
front contact 38 of relay LD, back contact 39
of relay RD, back contact 52 of relay WR, front
contact 53 of relay WN and normal west con
- ductor NW to signal 2A.
Code No. 4.—This code is not used but it will be
later explained what happens in the event that
this code is inadvertently received, due to the
reception of a wrong impulse in connection with
one of the other code combinations.
7 Code No. 5.—The number I-- impulse closes a
circuit for picking up relay WR extending from
(+), front contact [5 of relay ST, contact I“! of
relay F in its left hand dotted position, back
contacts 32 and 33 of relays 5V and 4V respec
tively, front contact 34 of relay 3V, l—- bus, front
contact 54 of relay STS and winding of relay WR
to (—).
40
Relay WR closes a stick circuit for itself
extending from (+), front contact ill of relay
STS, front contact 55 and winding of relay WR
to (+). ‘This stick circuit is maintained ener
gized after the completion of this cycle of op
erations at back contact 20 of relay ST. At the
end of the cycle a circuit is closed for operating
; the switch machine to its reverse position ex
tending from (+), front contact 45 of relay WR,
reverse conductor R, switch machine motor, nor
mal conductor N, back contact 46 of relay STS
and back contact 43 of relay WN to (—). Since
this is a stop code used when it is desired to op
erate the switch machine to its reverse position
without clearing any of the signals, the 2+ and
3+ impulses are effective to kick down relays
LD and RD as before.
.
Code No. 6.-The number I— impulse is effec
tive to operate the switch machine to its reverse
position as just described. The 2+ and 3_ im
pulses are effective to kick down relay LD and
to leave relay RD energized as described in con
60 nection with Code Number 2.
With relay WR
up, relay WN down, relay RD up and relay LD
down, a circuit is closed for clearing signal IB
which extends from (+), back contact 38 of re
lay LD, front contact 58 of relay RD, front con
' tact 59 of relay WR, back contact 55 of relay WN
and reverse east conductor RE to signal lB.
Code No. 7.—The number 1- impulse is effec
tive as before for operating the switch machine
70 to reverse. The No. 2- and 3+ impulses are
effective as in Code No. 3 to kick down relay RD
and leave relay LD energized. A circuit is closed.
for clearing signal 2B which extends from (+),
front contact 38 of relay LD, back contact 39 of
75 relay RD, front contact 52 of relay WR, back
'
Code No. 8.—This code combination is not used
in the present embodiment, but the combination
of impulses in this code which may be received 1
due to the reception of a wrong code is effective
to produce certain results which will be later de
scribed.
When any of the signals are cleared, the occu
pancy of the track section results in relay T '10
being de-energized to drop its front contact 37.
This de-energizes the stick circuits of the RD and
LD relays, so'that the energized one of these re
lays will be de-energized to put all signals to stop,
by opening front contacts 38 and 58 of these relays.
Shortly after relay T drops its contacts, relay TP
is de-energized to close its back contact 6| which
again energizes the stick conductor of the direc
tion relays. Therefore a code may be trans
mitted, received and stored while the track sec 20
tion is occupied. It will be understood that this
code is not effective to clear a signal while the
train is in the track section, because of certain
correspondence and lock circuits which are pro
vided and‘which are familiar to those skilled in
the art. Therefore these additional circuits need
not be explained in connection with the present
disclosure.
For convenience in describing how a route may
be put to stop, it will be assumed that the track switch TS is in a reverse position and. the signal
213 has been cleared as previously described.
This route may be put to stop by the passage of
a train over the detector track section as previ
ously described, or, by manual manipulation of
the control lever in the control of?ce. It will
now be explained how this stop code (either
(+) (+) (+) or (—) (+) (+)) is received and
how it puts the cleared route to stop.
,
Since a stop control code need be received only
when a route is actually cleared, the reception of
the stop code can be made dependent upon the
prior reception of 2. proceed code. Since it is
assumed that the switch is in-a reverse position
with signal 23 cleared the previous proceed code
was (—) (—) (+) , resulting in control relays WR
and LD being up.
Since relay WR is up and its back contact 2|
open,'relay STS cannot be picked up at the start
of this cycle. Therefore, the ?rst impulse either
(+) orv (+) is not effective to energize either of
the switch control relays, because the 1+ and the
1— buses are open at front contacts 40 and 54
respectively of relay STS. The number 2+ im
pulse is e?ective to pick up stop relay IS over a.
circuit extending from (+), front contact I6 of
relay ST, contact I‘! of relay F in its right hand
4-0
45
.
.
dotted position, back contact l8 of relay 5V, front
contact 19 of relay 4V, 2+ bus, back coritact 46
of relay STS, back contact 62 of relay 2S and 60
upper winding of relay IS to (—) . Relay IS
closes a stick circuit for itself extending from
(+), front contact 63 of relay ST, front contact
64 and upper winding of relay IS to (+).‘ The
3+ impulse closes a circuit for picking up relay
28 extending from (+), front contact I6 of relay
ST, contact ll of relay F in its right hand dotted
position, front contact 18 of relay 5V, 3+ bus,
back contact 48 of relay STS and winding of re
lay 2S to (+). Relay 2S closes an obvious stick 70
circuit for itself at its front contact 65.
At the end of the cycle, relay SA closes its back
contact 66 before relay LV opens its front con
tact ii‘l, so that a momentary impulse is extended
through these two contacts and through front 75
6
2,082,180
contact 68 of relay 2S, front contact 69 of relay
relay 28 is open. If the third impulse is 3+ relay
IS, front contact 10 and lower winding of relay
down relay LD and since relayRD is already down
2S will be picked up, if not already up, but in any
event relay IS is down. If the third impulse is
3- this impulse is ine?fective because relay IS is
all signals are put to stop.
down and its front contact ‘I5 is open.
LD
to
(+) . ' This
momentary impulse
kicks
With both front con
tacts 1| and 72 of relays RD and LD, respec
tively, down and with front contact 4| of relay
STS down, the stick circuit for relays WN and
WR Bide-energized before relay ST drops its
r19 contact 20 at the end of the cycle. This results
in’ de-energizing relay WR so that all of the
control relays WN, WR, RD, and LD are restored
to normal. Relays IS and 2S are‘de-energized
when relay ST drops its front contact 63 at the
end of the cycle.
It will be evident that the stop code is effective
to pick up the IS and 2S relays during a cycle, at
the beginning of which relay STS could not be
picked up because some signal was cleared. It
is believed that the above example is sufficient to
indicate that this stop code is effective with either
of the switch control relays or either of the direc
tion relays picked up. In the event that relay RD
is picked up to clear an east bound signal, then
25 the reception of a stop code is effective to kick
down relay RD by means of the previously de
scribed circuit now extending through front con
tacts I68 and IE9 of the stop relays, front con
30
With front
IS will be picked up then if a 3- is received on the
third step, either alone or with a 3+, relay IS will 1O
be kicked down.
Since both stop relays must be
up to render the stop code effective it will be seen
that a reception of a wrong code, an extra impulse
or the omission of an impulse will prevent the
cleared signals being put to stop by preventing
both stop relays being up when relay SA drops its
contact 65 at the end of the cycle.
It will now be assumed that all signals are at
stop at the beginning of a cycle during which
Code No. l is received.
This means that relay ‘
STS will be picked up at the start of the cycle.
If a (+) and a (—) impulse are received on the
?rst step, both the 1+ and the 1- buses will be
energized to pick up relays WN and WR. With
both contacts 43 and 45 of these relays picked up
the switch machine motor cannot be energized
and since contact 134 of relay STS is picked up at
the time that the number. 1 impulse is received it
tact ‘I3 and lower winding of relay RD to (—) .
makes no diiference which relay WN or WR is
With reference to the above code table it is
apparent that the track switch can be operated
to normal or reverse positions at the will of the
operator, without clearing a route by the use of
Codes 1 and 5 respectively. The use of such codes
to eifect the operation of the track switch must be
picked up ?rst.
With both relays WN and WR picked up no
signal can be cleared, because the signal clearing
circuits require that one or the other of these
relays be down. If the second impulse received is
transmitted after the signals have been put to
stop,_because the switch control relays can not be
changed in their positions while a signal is clear.
This is due to the fact that either direction relay
maintains the stick circuit for the switch control
relays energized and this condition prevents the
picking up of relay STS at the beginning of a
cycle, so that it is necessary to transmit a stop
code for restoring these control relays to normal
before the track switch can be operated without
clearing a signal.
Reception of wrong codes-An important fea
ture of the present invention relates to the ar
rangement of the codes and the circuits controlled
by these codes for preventing the faulty operation
of the track switch, the clearing of a wrong signal
or the putting of signals to stop upon the reception
of an improper code. The following explanation
will be devoted to the code combinations which
are used for operating the switch machine and
clearing the signals in various combinations, as
given in the above code table.
Code No. 1.—It will ?rst be assumed that some
signal is clear when this code is received. Since
relay STS cannot be picked up the only code buses
effective are 2+, 2-, 3+ and 3-. Therefore a
1+ or a 1- impulse is ineffective to change any
thing. If the second impulse is (+) and (—)
received in this order, the 2+ impulse will pick up
65 relay I S and the 2- impulse will immediately kick
it down. The circuit for kicking down relay IS
extends from (+), front contact I6 of relay ST,
contact I ‘I of relay F in its left hand dotted posi
tion, back contact 32 of relay 5V, front contact 33
70 of relay 4V, 2- bus, back contact 5I of relay STS,
front contact ‘I4 and lower winding of relay IS to
(—). If the 2— impulse is received ?rst, relay 2S
will be picked up over a circuit extending through
back contact ‘I4 of relay IS.
Then the 2+ im
75 pulse is ineffective becauseback contact 62 of
Cl
contacts 68 and I69 of relay IS open the stop code
is ineffective to put signals to stop.
If 2+ only is received on the second step relay
both (+) and (—) , both the 2+ and 2-— buses are "3'
energized which results in kicking down relays
LD and RD so that no signal will be cleared.
Upon the reception of a (+) and a (—) impulse
at the third step, both buses 3+ and 3— will be
energized for kicking down relays RD and LD so
that no signal can be cleared. It will thus be seen
that under this condition the reception of an
extra impulse in connection with a stop code is
ineffective to falsely clear a signal.
Code No. 2.—The reception of a surge at the 45
?rst step which energizes buses 1+ and 1- will
pick up relays WN and WR so that no signal can
be cleared and the switch machine position can
not be changed, for the reasons described in con
nection with Code No. 1. The reception of (+)
and (—) impulses at the second step kicks down
both direction relays so that no signal can be
cleared. The reception of (+) and (—) impulses
at the third step kicks down both direction relays
so that no signal can be cleared.
Code No‘. 3.—The reception of two impulses at
the ?rst step in connection with this code effects
the same operation as described in connection
with Code No. 1. The reception of (+) and (—)
impulses at the second step kicks down both direc (K)
tion relays, because the energization of buses 2+
and 2- energize the lower windings of these two
relays in opposition to their upper windings as
previously described.
Similarly the reception of
(+) and (—) impulses at the third step kick down > '.
these direction relays in the previously described
manner.
It is believed unnecessary to describe the de
tailed operation of the result due to the reception
of surges in connection with the other three codes,
since the surges affect the control relays in the
same manner already described. In the event
that an impulse is not received for a suf?cient
time to energize the'control buses for picking up
the switch control relays, or for kicking down the
2,082,180. -
direction relays the result is that no wrong condi-j
tion will be e?ected. This is because with both
relays WN and WR. down the switch machine can-._
not be operated and a signal cannot be cleared
and with both relays RD and LD up no signal can
be cleared.
,
In connection with the signal clearing codes,
the reception of a wrong code at any one step
is ineffective to clear a signal but the control cir3
10 cuits will be left in the conditions last assumed.
For example, in connection with Code No. 2, if
the second impulse is received (—) instead of
means responsive to a subsequent code of said
series for cancelling said selection.
3. In combination, a track switch, signals for
governing tra?ic over said track switch, clearing
circuits for said signals, a line circuit having a
series of characteristic impulses successively
transmitted thereover, means for receiving said
impulses, means responsive to the reception or”
an impulse of said series for preparing one of
said clearing circuits, means responsive to the
ergizing the 3- bus on the third step kicks down
relay LD so that no signal will be cleared.
reception of succeeding impulses of said series of
unlike character for completing said prepared cir
cult, and means responsive to the reception of
succeeding impulses of said series of like charac—.
ter for annulling said prepared circuit.
4. In combination, a track switch, signals for
governing tra?ic over said track switch, a clear
If the second impulse is properly received (+)
relay LD will be kicked down, then if the third
impulse is improperly received (+) , relay RD will
ing circuit for each of said signals, a line circuit
having a series of impulses transmitted thereover,
means for registering said impulses, means re-"
(+) in Code No. 2 and the third impulse is
properly received (—), energizing the 2- bus
15 on the second step kicks down relay RD and em
be kicked down and no signal will be cleared.
sponsive to a first one of said impulses for con
It is believed that the above examples are su?i
cient to indicate how the present invention is
arranged for checking against extra impulses re
25 ceived, due to surges or the like, vagainstwro'ng
impulses received and against the absence of im
pulses at the di?erent steps of the cycle.
trolling said track switch and for selecting a plu
The system contemplated by the present inven
30
to a second one of said impulses for selecting and
energizing one of said plurality of clearing cir
cuits, and means responsive to a third one of said
impulses for immediately deenergizing said en
ergized clearing circuit.
tion is arranged so that correspondence is re-'
5. In combination, a track switch, signals for
quired between the track switch and the switch
governing tra?ic over said track switch, a clearing .
control relays, so that a route cannot be cleared
without the proper response of the switch ma
chine. Since this portion of the system is im
material'to an understanding of the features of
1.: Cl the present invention it has been omitted from
the present disclosure for the sake of simplicity.
Such correspondence circuits may be as disclosed
in the prior application of T. J. Judge, Ser. No.
678,045‘, ?led June 28, 1933.
130
rality of said clearing circuits, means responsive
These various features and others which are
apparent from a study of the above description,
provides a safe and reliable control for the traf?c
controlling devices through the medium of a
code type communication system.
Having thus described a centralized traffic con
trolling system as one embodiment of the present
invention, it is desired to be understood that this
form is selected to facilitate in the disclosure of
the invention rather than to limit the number of
forms which it may assume and it is to be further
understood that various modi?cations, adapta
tions and alterations may be applied to the spe
ci?c form shown to meet the requirements of
practice, without in any manner departing from
the spirit or scope of the present invention, ex
cept as limited by the appended claims.
What I claim is:—
circuit for each of said signals, a line circuit
having a series of impulses of predetermined char
acter transmitted thereover, means for selectively
registering the character of said impulses, means
responsive to a ?rst one of said impulses for con
trolling said track switch and for selecting a
plurality of said clearing circuits, means respon
sive to a second one of said impulses for selecting
and energizing one of said plurality of clearing
circuits, and means responsive to a third one of’ 40
said impulses for immediately deenergizing said
energized clearing circuit.
6. In combination, a track switch, signals for
governing tra?ic over said track switch, a clear
ing circuit for each of said signals, a line circuit
having a series of impulses of predetermined
character transmitted thereover, means for se
lectively registering the character of said im
pulses, means responsive to a ?rst One of said
impulses for controlling said track switch and for ;
selecting a plurality of said clearing circuits,
means responsive to a second one of said im
pulses for selecting and energizing one of said
plurality of- clearing circuits, means_responsive
to a third one of said impulses of one character
for immediately deenergizing said energized clear
ing circuit, and means responsive to a third one
1. In combination, a track switch. signals for
of said impulses of another character for pre
governing tra?ic over said track switch, clearing
venting the deenergization of said energized clear
ing circuit.
(10 circuits for said signals; a line > circuit having
a series of coded impulses successively transmit
ted thereover, means for storing an initial code
'7. In combination, a line circuit having a series
of positive and negative impulses forming a code
of said series .and concomitantly therewith effect- ‘ transmitted thereover, a polar relay included in
ing selection of one of said clearing circuits, means said line circuit, step-by-step mechanism oper
able to take one step for each of said impulses,
, responsive to a second code of said series for
energizing said selected clearing, circuit, and a pair of control relays, energizing circuits for
means responsive to a third code of said series for said pair of control relays closed at one step of
said mechanism, and deenergizing circuits for
con?rming said selection.
2. In combination, a track switch, signals for said'pair of control relays selected by said polar
relay and closed on another step of said mecha 70
70 governing trai?c over said track switch, clearing
circuits for said signals, a line circuit’ having a
8. In combination. a line circuit having a series
series ofv coded impulses successively transmit
of positive and negative impulses forming a code
ted thereover, means for storing an initial code
transmitted thereover, a polar relay included in
of said series and concomitantly therewith e?ect
ing selection of one of said clearing circuits, and said line circuit, step-by-step mechanism oper 75
nism.
I
.
,
8
2,'082, 180
able to take one step for each of saidimpulses, a
pulses applied thereto to form ‘a distinctive code
pair of control relays, energizing circuits for said
pair of control relays closed at one step of said
combination, a step-by-step means operable to
take one step for each of said impulses, code
mechanism, and differential deenergizing circuits
receiving relays selectively operated at a step of
for said pair of control relays selected by said
polar relay and closed on another step of said
mechanism.
said step-by-step means for controlling said
switch machine, a station relay rendered active
9. In combination, a line circuit having a series
of impulses of distinctive character transmitted
thereover, step-by-step mechanism operable to
take one step for each of said impulses, a pair of
control relays selectable at a particular step of
said mechanism and energized at a previous
step of said mechanism, means responsive to the
character of an impulse of one character re
ceived at said particular step for selectively de
energizing one of said control relays, and means
responsive to the reception of an impulse of an
other character at said particular step for de
energizing the other of said relays.
10. In a centralized tra?ic controlling system,
a track switch, a switch machine for operating
said track switch, signals for governing traffic
over said track switch, a line circuit having series
of characteristic impulses transmitted thereover
to form distinctive signal clearing and stop code
combinations, means for receiving said impulses,
step-by-step mechanism operable ‘through a
cycle one step for each impulse of a series, switch
machine control means responsive to a switch
code received during a cycle, signal clearing
means responsive to a signal code received dur
ing a cycle, stop control means responsive to a
stop code received during a cycle, a selecting
relay, means controlled by said selecting relay
for rendering said switch control and said signal
clearing means operable by said mechanism only
when said switch control and said signal clearing
means are inactive at the start of a cycle, and
means for rendering said switch control and said
signal clearing means inactive in response to a
stop code when and onlyv when some part of said
switch control means or said signal, clearing
means is active at the start of a cycle.
11. In a centralized trailic controlling system,
a track switch, a switch machine for operating
said track switch, signals for governing traffic
when said impulses are to control said code re
ceiving relays, a station repeating relay ren
dered active only when said station relay is ren~
dered active and all of said code receiving relays 10
are inactive, means for allowing said code re
ceiving relays to be controlled in accordance
with said code combination only when said sta- .
tion repeating relay is rendered active, and means
for allowing said switch machine to be controlled
by said code receiving relays only when said
station repeating relay is rendered inactive.
13. In combination, a railroad track section, a
track switch associated with said section, signals
for governing traffic over said track switch, 20
clearing circuits for said signals, a line circuit
having a series of characteristic impulses suc
cessively transmitted thereover, means for re
ceiving said impulses, means responsive to the
reception of an impulse of said series for pre
paring one of said clearing circuits, means re
sponsive to the reception of succeeding impulses
of said series of unlike character for completing
said prepared circuit, means responsive to the re
ception of succeeding impulses of said series of
like character for annulling said prepared circuit,
and means controlled by the occupancy of said
section for annulling said prepared circuit.
14. In combination, a line circuit having a series
of positive and negative impulses forming a code
transmitted thereover, a polar relay included in
said line circuit, step-by-step mechanism operable
to take one step for each of said impulses, a pair
of control relays, energizing circuits for said pair
of control relays closed at one step of said mecha
nism, stick circuits for said pair of control relays,
deenergizing circuits for said pair of control re
lays independent of said stick circuits selected
by said polar relay and closed on another step of
45
said mechanism, and means for deenergizing said
pair of control relays by the deenergization of said
over said track switch, a line circuit having series
stick circuits.
of characteristic impulses transmitted thereover
to form distinctive signal clearing and stop code
combinations, means for receiving said impulses,
step-by-step mechanism operable through a
cycle one step for each impulse of a series, switch
15. In combination, a, line circuit having a
series of impulses of distinctive character trans
machine control means responsive to a switch
code received during a cycle, signal clearing
means responsive to a signal code received during
a cycle, stop control means responsive to a stop
code received during a cycle, a selecting relay,
means controlled by said selecting relay for ren
(H dering said switch control and said signal clear
mitted thereover, step-by-step mechanism oper
able to take one step for each of said impulses,
a pair of control relays selectable at a particular
step of said mechanism and energized at a
previous step of said mechanism, a track section
including a track switch governed by said control
relays, means responsive to the character of an
impulse of one character received at said par
' clearing means inactive in response to a stop
ticular step for selectively deenergizing one of said
control relays, means responsive to the reception
of an impulse of another character at said par
ticular step for deenergizing the other of said
relays, and means controlled by the occupancy of
said section for deenergizing both of said relays.
16. In combination, two control relays each
code when and only when some part of said
having active and inactive positions, conditioning
switch control means or said clearing means is
active at the start of a cycle, and means con
means for simultaneously operating said control
relays, a normally energized stick circuit for said
control relays, a ?rst control means for selectively
and individually releasing said control relays, a
second control means independent of said stick
circuit for simultaneously releasing said control
relays, a third control means for releasing said
ing means operable by said mechanism only when
said switch control and said signal clearing
means are inactive at the start of a cycle, means
for rendering said switch control and said signal
trolled by said relay for preventing the oper
ation of said switch machine during a cycle at the
start of which said switch control and said sig
nal clearing means are inactive.
12. In combination, a switch machine for
operating a railroad track switch, a line circuit
75 having a plurality of positive and negative im
25
control relays by deenergizing said stick circuit,
and a plurality of channel circuits selectively
9
2,082,180
energized in accordance with the positions of said
control relays.
17. In combination, a line circuit over which
said signal clearing and stop codes; a railroad
ing and stop codes are transmitted, a code receiver
connected to said line circuit for receiving said
codes, a railroad track switch and a plurality of
signals associated with said code receiver, a plu
track switch and a plurality of signals associated
with said code receiver; a plurality of signal con
trol relays for controlling said signals; means for
energizing said control relays at one point of a
code transmitted over said line circuit; means
responsive to a signal clearing code for selec 10
tively de-energizing one of said relays whereby
said signals are selectively cleared; and means
responsive to a stop code for de-energizing said
rality of signal control relays for controlling said
line circuit, means responsive to a signal clearing
code for selectively de-energizing one of said re
lays whereby said signals are selectively cleared,
15 and means responsive to a stop code for de-ener
gizing said plurality of control relays whereby said
signals are put to stop.
18. In combination, a line circuit over which
combinations of impulses comprising signal clear
ing and stop codes are transmitted, a code receiver
connected to said line circuit for receiving said
codes, a railroad track switch and a plurality
of signals associated with said code receiver, a
plurality of signal control relays for controlling
said signals, means for energizing said control
relays at the start of a code transmitted over said
line circuit, means responsive to a signal clearing
code for selectively de-energizing one of said
relays whereby said signals are selectively cleared,
30 a stop relay, means responsive to a stop code for
energizing said stop relay, and means effective
at the termination of said stop code and including
said stop relay for de-energizing said control re
lays whereby said signals are put to stop.
plurality of control relays whereby said signals
are put to stop.
15
21. In a selecting system; a transmitting sta
tion and a receiving station connected by a line
circuit, said line circuit being energized with im
pulses of variable polarity; a plurality of differ
ential relays at said receiving station each having 20
two similar windings; means at said receiving
station controlled over said line circuit for pick
ing up said relays by simultaneously energizing a
?rst winding of each relay in response to one of
said impulses; and means controlled by the
polarity of other impulses received over said line
circuit for releasing said relays by energizing
their second windings.
22. In a selecting system; a transmitting sta
tion and a receiving station connected by a line 30
signals, means for energizing said control relays
circuit, said line circuit being energized with im
pulses of variable polarity; a plurality of di?eren
tial relays at said receiving station each having
two similar windings; means at said receiving sta
tion controlled over said line circuit for picking
up said relays by simultaneously energizing a ?rst
winding of each relay in response to one of said
impulses; means for sticking said relays by ener
gizing stick circuits connected to said ?rst wind
ings; and means controlled by the polarity of 40
other impulses received over said line circuit for
releasing said relays by energizing their second
at the start of a code transmitted over said line
windings.
19. In combination, a line circuit over which
combinations of impulses comprising signal clear
ing and stop codes are transmitted, a code receiver
connected to said line circuit for receiving said
codes, a railroad track switch and a plurality of
signals associated with said code receiver, a plu
rality of signal control relays for controlling said
circuit, means responsive to a signal clearing
45 code for selectively de-energizing one of said re
lays whereby said signals are selectively cleared,
a stop relay, means responsive to a stop code for
energizing said stop relay, means effective at the
termination of said stop code and including said
50 stop relay for de-energizing said control relays
whereby said signals are put to stop, and means
responsive to the occupancy of the track section
with which said track switch is associated for de
energizing said control relays whereby said signals
55
means including said code receiver for receiving
combinations of impulses comprising signal clear
10 signals, means for energizing said control relays
at the start of a code transmitted over said
35
to a receiver selecting‘ code for selectively asso
ciating said code receiver with said line circuit;
are put to stop.
20. In combination; a line circuit over which
combinations of impulses comprising receiver
selecting, signal clearing and stop codes are
transmitted; a code receiver; means responsive
'
23. In a selecting system; a transmitting sta
tion and a receiving station connected by a line 45
circuit, said line circuit being energized with im
pulses of variable polarity; a plurality of differ
ential relays at said receiving station each having
two similar windings; means at said receiving
station controlled over said line circuit for pick 50
ing up said relays by simultaneously energizing
a ?rst winding of each relay in response to one
of said impulses; means for sticking said relays
by energizing stick circuits connected to said ?rst
windings; and means controlled by the polarity 55
of another of said impulses received over said
line circuit for selectively releasing one of said
relays by energizing its second winding.
WINFRED T. POWELL.
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