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Патент USA US2116178

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May 3, 1938. '
2,116,178
w. T. POWELL.
RAILWAY TRAFFIC CONTROLLING SYSTEM
Original Filed July 31, 1934
U/
BY/ZMM
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M
ATTORNEY
Patented May 3, 1938
2,116,178
UNITED STATES PATENT OFFI?E
2,116,178
RAILWAY TRAFFIC CONTROLLING SYSTEM
Winfred T. Powell, Brighton, N. Y., assignor to
General Railway Signal Company, Rochester,
N. Y.
Original application July 31, 1934, Serial No.
737,781, now Patent No. 2,083,525. Divided and
this application March 4, 1937, Serial No.
129,017
4 Claims. (G1. 246-3)
This invention relates to traffic controlling layouts, involving con?icting and noncon?icting'
systems for railroads and it more particularly routes and various other conditions encountered
pertains to a system for the remote control of in practice, it has been speci?cally illustrated as
power operated switch machines.
applied to a single track switch and preferably
This application is a division of my prior appli
associated with an‘ automatic block signal system
cation Ser. No. 737,781, ?led July 31, 1934, now of the type, for example, as disclosed in the pendw
ing application of S. N. Wight, Ser. No. 120,423,
U. S. Letters Patent No. 2,083,525.
In a system of remote control of power operated ?led July 23, 1926, now U. S. Letters Patent
switch machines for use in connection with ter
minals, interlocking plants and centralized traflic
controlling systems, it is desirable that the various
controls and indications required for e?icient op
'
With reference to the accompanying drawing, 10
the railroad track switch TS is illustrated as con
eration of a switch machine be obtained over a
necting the rails 3 of a main track to the rails 4
of a diverging or turnout track. Track switch TS
minimum number of line wires between the tower
or control of?ce and the remote point where the
switch is located. Therefore, one object of the
is operated by a power driven switch machine
SM, which may be of any suitable type such, for 15
example, as disclosed in the patent to W. K. Howe,
present invention is to provide a simple and re~
liable arrangement of line circuits and relays so
No. 1,466,903, issued September 4, 1923.
organized that several different distinctive con
trolling conditions may be simultaneously trans
mitted in response to the energization or de
energization of the line circuits.
More speci?cally, this invention provides for
the transmission of the controls required for a
25 power operated switch machine over a single
polarized line circuit and the provision in such a
circuit of an improved arrangement for requiring
the movement of the control lever at the time
the locking is ineffective, in order to operate the
30 switch machine in such a manner that it will not
operate after a train movement over the switch
until the operator shifts the control lever to its
last previous effective position.
Brie?y, an electric lock equivalent arrange
35 ment is provided whereby, in the event that the
operator shifts the switch machine control lever
while the circuits have the switch machine locked
against operation, it is necessary for the operator
to restore the switch machine control lever into
40 ‘correspondence with the position of the as
sociated switch machine control relay before con
trol of the switch machine is obtained, regardless
of whether the switch machine remains locked
45
2,082,436.
or becomes unlocked in the interim.
Various other characteristic features and ad
vantages of the invention will be in part apparent
and in part speci?cally pointed out as the de
scription thereof progresses.
In describing the invention in detail reference
50 will be made to the accompanying drawing, which
is a diagrammatic illustration of the present in
vention as applied to the control of a single track
switch at a remote location.
Although the tra?ic controlling system of the
55 present invention may be applied to various track
This
switch machine may be provided with a dual con
trol selector to permit hand operation of the
track switch such as shown, for example, in the 20
patent to W. K. Howe, No. 1,852,576, issued April
5, 1932.
The main track adjacent the track switch TS
and a portion of the diverging track to the fouling
point, comprises a detector track circuit of the 25
closed circuit type with the usual track battery
5 and track relay T, which detector track circuit
is insulated from the rest of the track layout
by the usual insulated joints.
Tra?ic over the track switch in an east bound
direction is governed by signals I and ID on the
main track and on the turnout track respectively.
Traffic over the track switch in a west bound di
rection is governed by signals 2 and 2D on the
main track and off the turnout track respectively. 35
The track switch and the switch machine are
preferably provided with point detector contacts
of some suitable type such, for example, as dis
closed in the patent to C. S. Bushnell, No.
1,517,236, issued November 25, 1924. These point 40
detector contacts are employed to energize a
switch position repeating relay of the usual polar
neutral type, in accordance with the position and
the locked or unlocked condition of the track
switch, but since this particular feature forms no 45
part of the present invention it has been omitted
from the disclosure for the sake of simplicity.
Referring to the drawing, a polar relay WZ
of the magnetic stick type is governed from the
control o?ice over a suitable polarized line cir
cuit, including line conductor WL and common
conductor C. This relay may be of any suitable
type, in which the polar contacts are operated to
one extreme position or the other in response to
current ?ow over the line circuit in a particular 55
2
2,116,178
direction or another, the polar contacts remain
ing in their last actuated positions when the
winding of the relay is deenergized.
Signal repeating relay M is provided to repeat
Relay LP is energized over a stick circuit ex—
the condition of the signals associated with the
illustrated track section. This relay is ener
tending from the (B+) terminal of battery B1,
front contact 25 of relay L, resistance RS, front
gized as long as all signals are at stop and is de~
energized when any one of the signals is clear.
LP, to the (B—) terminal of battery B1.
Since the method of providing this feature forms
10 no part of the present invention and since it is
well known to those skilled in the art, the opera
tion of relay M is merely indicated by associating
the relay with contacts ll, I2 and [3 of the as
sociated signals by a dotted line to indicate that
15 the relay is energized when all the signals are at
stop.
,
Lock relay L is provided to lock the associated
switch control circuit against operation when
ever the track section is occupied or whenever a
20 signal is clear. Such operation. is provided by
deenergizing relay L to open the control line cir
cuit extending to relay WZ.
Lock repeater relay LP is provided for the pur
pose of effecting the electric lock equivalent fea
25 ture, as will be speci?cally pointed out. Resist
ance RS is for the purpose of maintaining a
substantially uniform current flow through the
upper winding of relay LP, whether this winding
is energized locally by both portions of battery B1
30 or over the line circuit.
In the control o?ice, signal control lever SGL
is illustrated to indicate that the signals at the
remote point are controlled over signal control
line conductor GL. Since this operation forms
35 no part of the present invention, it is merely
indicated by a dotted line, the detailed circuits
being omitted. Switch machine control lever
SML in the control o?ice is for the purpose of
controlling the associated switch machine, the
40 detailed operation of which will be explained
later.
Battery B in the control office and battery B1
at the ?eld station are each provided with a cen
ter tap (CN), with these center taps being con
45 nected together by means of common conductor
C. The symbol (B+) is associated with the (+)
terminal of each of these midtap batteries and
symbol (B—) is associated with the (-) terminal
of each battery, it being understood that current
50 ?ows from the (B+) terminal in the external
circuit back to the midtap or the (B—) terminal
as determined by the circuit connections. To
simplify the illustration, the symbol (+) is used
to indicate the positive terminal and the symbol
55 (——> is used to indicate the negative terminal of a
suitable battery or other source of current at
the station, with the circuits to which these ter
minals are connected having current ?owing in
the external circuit from (+) to (—).
It is believed that further description of the
present invention will best set forth the charac
teristic features and functions of the system, by
considering the detailed operation under certain
characteristic or typical conditions.
65
for energizing relay L which extends from (+),
front contact 1 of relay M, front contact 6 of relay
T and winding of relay L, to (—).
Operation
Normal condition.—With the detector track
section unoccupied and with the switch control
lever SML in the position illustrated, the various
70 devices, relays and circuits assume positions and
conditions of energization as illustrated. Since
it is assumed that the track section is unoccupied,
track relay T is normally energized and since all
signals are at stop, relay M is normally energized.
With relays M and T energized a circuit is closed
contact 26 of relay LP and upper winding of relay
The
energizing current for the upper winding of relay
LP is maintained at a normal level, when both 10
portions of battery B1 are connected to the circuit,
by means of resistance RS.
Relay WZ is energized over a circuit extending
from the (B+) terminal of battery B in the con
trol office, lever SML in its normal position, line 15
WL, front contact 2| of relay LP, front contact
20 of relay L, winding of relay WZ and common
conductor C, to the (CN) terminal of battery B,
which is the (-) terminal of the right hand por
tion of this battery. Contact In of relay WZ, in 20
its right hand normal position, controls the nor
mal operating circuit of switch machine SM and
contact H1 in its left hand reverse position con
trols. the reverse operating circuit of switch ma
chine SM, as indicated by reference characters N1 25
and R1.
Manaal control of track switch-It will now be
assumed that the operator moves lever SML to,
its reverse dotted line position. The actuation
of lever SML to its reverse position closes a cir 30
cuit from the (B—) of battery B, contact of
lever SML in its reverse position R, line con
ductor WL, front contacts 2| and 20 of relays LP
and L respectively, winding of relay WZ and con
ductor C, to (CN). The reversal of current over 85
the line circuit switches the polar contacts of
relay WZ from their right hand normal positions
to their left hand reverse positions and contact
I0 governs the operation of the switch machine
to its reverse position.
40
The operation involved in actuating the track
switch from its reverse position to its normal
position is merely the reverse of that described
and need not be speci?cally pointed out. It
need only be mentioned that the return of lever 45
SML to its normal position reverses the current
flow through relay WZ for positioning the polar
contacts of this relay back to their right hand
normal positions.
Manual control of signals.——Assurning clear 50
traffic conditions, either signal I or 2 may be
cleared with the track switch in a normal position
and signal ID or 2D may be cleared with the
track switch in a reverse position. The signals
are governed in accordance with the position of 55
signal lever SGL and, as above mentioned, the
detailed circuits for clearing the signals are not
shown. It will be understood that the series
circuit including relay M is opened when any
signal is cleared, due to the opening of some one
of the contacts ll, 12 or I3.
The deenergization of relay M opens the ener
gizing circuit of relay L at front contact ‘I, caus
ing relay L to be deenergized. The opening of
front contact 20 of relay L locks the switch con
trol circuits, so that the operator does not have
control over relay WZ during the time that a sig
nal, governing traffic over the track switch, is
clear.
An “electric bias control” feature is provided to
maintain relay WZ energized in its last ener
gized condition when relay L is dropped. For
example, with the circuits in the conditions shown,
the dropping of relay L closes a circuit for main
taining relay WZ energized in the same direction,
60
65
70
75
2,116,178
3
which circuit extends from’the (B+) terminal
of battery B1, contact 22 of relay WZ in its right
hand position, back contact 20 of relay L and
terminals of the windings of relay LP. For ex;
winding of relay WZ, to (ON) . It will be obvious
that if relay WZ has its contacts in their left
hand position, due to lever SML being actuated
to its reverse position, then the release of relay
L completes a circuit for maintaining relay WZ
traced from the (B+) terminal of battery B, con
tact of lever SML in its normal position, conduc
tor WL, back contact 2| of relay LP, front contact
24 of relay L, contact 23 of relay WZ in itsleft hand
energized, from the (B—) terminal of battery B1,
the (B+) terminal of battery B1, which circuit
10 contact 22 of relay WZ in'its left hand dotted
position, back contact 20 of relay L and winding
of relay WZ, to (CN) .
Electric lock equioale'nt.—In the event that the
operator actuates lever SML to a new position
while the track switch is looked, as indicated by
relay L being deenergized, this actuation is in
effective to condition the control circuits. With
the circuits in the conditions indicated, it will be
assumed that relay L is deenergized and that the
20 operator actuates lever SML to its reverse posi
tion before relay L is picked up. It will be un
derstood that relay L will be dropped by deener
gizing its circuit in response to the clearing of a
signal or in response to the occupancy of the track
25 section, as above described. Since the control line
circuit WL is open at front contact 20 of relay L,
the actuation of lever SML is ineffective to ener
gize relay WZ.
The deenergization of relay L opens the above
30 described stick circuit of relay LP at front con
tact 25, so that relay LP is released. Under this
condition, the actuation of lever SML is ineffec
tive because the WL line circuit is open at front
contact 2i of relay LP and at front contact 24 of
35 relay L, both relays being deenergized.
When relay L is again picked up, then if lever
SML is in its normal position a circuit is closed
for picking up relay LP which extends from (B+) ,
contact of lever SML in its normal position, con
40 ductor WL, back contact 2| of relay LP, front
contact 26 of relay L, contact 23 of relay WZ in
its right hand normal position, upper winding of
relay LP, through the right hand portion of bat
tery B1 and conductor C, to the (CN) terminal
of battery B. It will be noticed that the right
hand portions of batteries B and B1 are connected
in series aiding relation in the above described
circuit, so that relay LP is energized. The closure
of front contact 26 of relay LP completes the stick
circuit for this relay before the above described
pick up circuit is broken at back contact 2|. This
is due to the fact that front contact 26 closes
before back contact 2| opens. This stick circuit
extends from the (B+) terminal of battery B1,
front contact 25 of relay L, resistance RS, front
contact 26 of relay LP and upper winding of relay
LP, to the (B—) terminal of battery B1.
A similar condition exists with relay WZ in its
left hand reverse position, when relay L is picked
(i0,
up after being deenergized. Under this condi
tion a circuit is closed for energizing relay LP
which extends from the (B—) terminal of bat
tery B, contact of lever SML in its reverse dotted
line position, conductor WL, back contact 2! of
relay LP, front contact 24 of relay L, contact 23
of relay WZ in its left hand dotted position, lower
winding of relay LP, through the left hand por
tion of battery B1 and conductor C, to the (CN)
terminal of battery B. Relay LP again picks up
70 and closes its above described stick circuit.
In the event that lever SML is actuated out of
correspondence with relay WZ when relay L is
deenergized, then upon the picking up of relay
L, relay LP cannot be energized because like ter
minals of the batteries are connected to opposite
ample, with lever SML in its normal position and ‘
relay WZ in its reverse position, a circuit may be
dotted position and lower winding of relay LP, to
is not energized and will not pick up the LP relay. 10
Or if lever SML is in its reverse dotted line
position when relay W2 is in its normal position,
then a circuit may be traced from the (B~—) ter
minal of battery B, contact of lever SML in its
reverse dotted position, conductor WL, back con 15
tact 2| of relay LP, front contact 24 of relay L,
contact 23 of relay WZ in its right hand normal
position and upper winding of relay LP, to the
(B—) terminal of battery 131. Current does not
flow in this circuit because like terminals of both 20
batteries are connected to opposite terminals of
the relay winding and the relay will not be picked
up. It therefore becomes necessary for the op
erator to restore lever SML to the position it pre
viously occupied when the last effective control 25
‘was exercised over the switch control circuits, be~
fore control of these circuits can again be ob
tained.
It is to be understood that, although only one
speci?c embodiment of the present invention has 80
been disclosed, the principles of the invention may
be applied to various other types of systems and
various types of track layouts may be controlled
in a similar manner, without departing from the
spirit of the present invention. The present dis 35
closure has been chosen merely for providing a
simplified showing which could be clearly de
scribed in the speci?cation.
Having described a traf?c controlling system for
one speci?c embodiment of the present invention, 40
it is desired to be understood that the form is se
lected to facilitate in the disclosure rather than
to limit the number of forms which it may assume
and it is to be further understood that various
modi?cations, adaptations and alterations may be 45
applied to the speci?c form shown in order to
meet the requirements of practice, all without
in any manner departing from the spirit or scope
of the present invention except as limited by the
50
appended claims.
What I claim is:
1. In a system of control for power operated
track switches for railroads; a switch machine
for operating a track switch; a source of energy at
said switch machine; a polar relay at said switch 55
‘machine for controlling it to normal and reverse
positions; a switch machine control lever and a
source of energy at a control o?ice; a normally
energized lock relay associated with said switch
machine and deenergized whenever it is unsafe, 60
to operate said track switch; a lock repeating
relay; a control circuit for said polar relay in
cluding a front contact of said lock repeating re
lay and energized with current of one polarity
or the other from said control o?ice source of 65
energy in accordance with the position of said
switch machine control lever; pick-up circuit
means for said lock repeating relay including a
front contact of said lock relay and both said
control oflice source of energy and said source 70
of energy at said switch machine, said pick-up
circuit having current flow therein only when
said control of?ce source of energy is connected
into said circuit by said switch machine control
lever in an aiding relationship to said source of 75
4
2,116,178
energy at said switch machine as it is then con
nected in the circuit by said polar relay; and
stick circuit means for said lock repeating relay
including a front contact of said lock relay and
its own front contact, said stick circuit means
when once energized remaining energized de
pendent upon said lock relay irrespective of cor
respondence between said switch machine control
lever and said two-position polar relay.
10
for said lock repeating relay for energizing said
lock repeating relay when once picked up‘ de
pendent only upon the picked up condition of
said lock relay.
3. In a system of control for power-operated
track switches for railroads; a switch machine; a
switch control polar relay for governing the oper
ation of said switch machine to the normal or
reverse position; a source of energy and a control
2. In a remote control system for power-oper
lever at a distant control office; a control circuit 10
ated track switches; a power-operated switch
for energizing said switch control relay with one
polarity or the other from said control o?ice
source in accordance with the position of said
lever; a lock relay adjacent the switch machine
automatically deenergized when the switch ma 15
chine operation should be prevented; means
rendered effective upon deenergization of said
lock relay to open said control circuit and to
machine; a source of energy at said switch ma
chine having terminals of opposite polarity and
a mid-tap; a polar relay for controlling said
15 switch machine and having one terminal con
nected to the mid-tap of said source of energy at
said switch machine; a switch machine control
lever at a control o?ice; a source of energy at
said control o?ice having terminals of opposite
20 polarity and a mid-tap; a lock relay associated
with said track switch and energized except when
it is unsafe to operate said track switch; a lock
repeating relay having two windings; a common
line wire connecting the mid-tap of said control
oi?ce source of energy and the mid-tap of said
source of energy at said switch machine; a con
trol line wire extending between the control o?ice
and said switch machine and connected to one
terminal or the other of said control o?ice source
30 of energy in accordance with the position of said
switch machine control lever, said control line
wire at the switch machine being connected to
said polar relay through a front contact of said
lock repeating relay; circuit means connecting
35 the two windings of said lock repeating relay to
the opposite terminals of said source of energy
at said switch machine; circuit means connecting
the other terminal of one of said windings of said
lock repeating relay through a circuit including a
contact closed with said polar relay in, one posi
tion and a front contact of said lock relay to said
control line wire, and connecting the other ter
minal of the other winding of said lock repeating
relay through a circuit including a polar contact
of said polar relay in its other position and a front
contact of said lock relay to said control line
wire, whereby said lock repeating relay is ener
gized with a potential of said control o?ice source
in an aiding relation to a potential from said
switch machine source of energy when said switch
machine control lever and said polar relay are in
corresponding positions; and stick circuit means
maintain it open until said means is restored; a
source of energy at the switch machine, and a 20
restoring circuit for said means including a con
tact closed only if said lock relay is energized,
said source of energy in the control o?ice and
contacts of said lever; said source of energy at
the switch machine and polar contacts of said 25
switch control relay, said restoring circuit having
current ?owing therein only if said lever and said
polar contacts are in corresponding positions so
that said sources of current act cumulatively.
4. In a system of control for power-operated 30
track switches for railroads, a switch machine, a
switch control polar relay adjacent the switch
machine for governing its operation to the nor
mal or the reverse position, a control lever and
a battery at a distant control office, a control cir 35
cuit including a line wire for energizing said
switch control relay with one polarity or the other
in accordance with the position of said lever, a
lock relay deenergized whenever operation of the
switch machine should be prevented, a stick relay 40
adjacent the switch deenergized whenever said
lock relay is deenergized for opening said line wire
of said control circuit and to maintain such open~
ing until said stick relay is restored, a local bat
tery at the switch machine, and means including
said line wire for restoring said stick relay only if
the battery in the control office is connected to
said line circuit by said lever with a polarity to
act cumulatively with the battery at the switch
machine as connected to said line wire by a polar
contact of said switch control relay.
W'INFRED T. POWELL.
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