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Патент USA US2125243

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July 26, 1938.
2,125,243
E. c. LARRY ET AL
AUTOMATIC BLOCK SIGNALING SYSTEM FOR RAILROADS
Filedx May 24, 1935
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IINVENTORS.
ECLar'ry and MCTwiTc'heH
BY M M '
THEIR ATTORNEY.
July 26, 1938;
E. c. LARRY ET AL
2,125,243
AUTOMATIC BLOCK SIGNALING SYSTEM FOR RAILROADS
Filed May 24, 1935
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2,125,243
Patented July 26, 1938’
'UNITED STATES PATENT OFFICE
2,125,243
AUTOMATIC BLOCK SIGNALING SYSTEM
FOR RAILROAD‘S
Edwin 0. Larry, Rochester, and Morton Cr
Twitchell, Spencerport, N. Y., 'assignors to
General Railway Signal Company, Rochester,
N. Y.
Application May 24, 1935, Serial No. 23,268
19 Claims. (Cl. 246-33)
This invention ‘relates to automatic block sig
naling systems preferably of the absolute-per
missive-block type, and more particularly to a
primary-secondary track relay combination co~
5 ordinated with other relays and devices of such
a- system.
' In accordance with the present invention it is
proposed to so interconnect a primary track re
lay and a secondary or repeater track relay, that
l0 the secondary relay will in accordance with the
position it assumes change the pick up and drop
away characteristics of the primary relay, so as
to result in a more sensitive and reliable track
circuit current detecting combination, and to
perform other functions by this primary-sec
ondary track relay combination. As is well un
derstood by thoseskilled in this art, the signaling
apparatus of an absolute-permissive-block sig
naling system absolutely blocks the movement of
2 O trains in an opposite direction to that of a ?rst
train in a single track section and affords per
~ missive follow up movement of trains in the same
direction through such section, and this type of
system usually employs a directional stick relay
2
for permitting such follow-up move.
More spe
ci?cally it is proposed in accordance with the‘
present invention to so coordinate the primary
secondary track relay combination with thedi
rectional stick relay of the absolute-permissive
30 block system, that the primary track relay, which
is the ?rst to drop due to the presence of a train
moving in a particular direction, will close a pick
up circuit for such stick relay and so that the
stick circuit for such stick relay is controlled at
c: Or
least indirectly by the secondary relay.
In accordance with one form of the invention
as illustrated in Fig. 2 of the drawings it is fur‘
ther proposed to so interconnect the primary and
secondary relay of the track relay combination
‘in that the wayside signal must give a stop indica
tion for ‘each deenergization of the repeater or
secondary track relay directly in advance of such
signal, before reenergization of the secondary
track relay can take place. This feature provides
a check on the failure of a signal to assume the
stop position, because failure of a signal to go to
stop causes the secondary relay to remain down
and this in turn causes the next signal in the rear
to assume a caution or a stop position, even
50 though more favorable tra?ic conditions exist in
advance thereof.
,
Other objects, purposes and characteristic fea
tures of the present invention will in part be de
scribed hereinafter and will in part be obvious
from the accompanying drawings, in which:
Fig. 1 illustrates one embodiment of the pres
ent invention, in which embodiment the wayside
signals are multiple aspect color light signals and
therefore do not require checking of the move
ment of the signal to stop, since the signals have
no moving parts; and
Fig. 2 shows a modi?ed form of the invention
applied to movable spectacle color light signals
and including means for checking the movement
of the signal spectacle to the stop position in re 10
sponse to tra?ic conditions requiring such an in
dication.
Figure 1
Referring to Fig. 1 of the drawings, in which
only a portion of a single track section of railway 15
track has been illustrated, the track rails I have
been divided by insulating joints 2 into isolated
sections, of which each two adjacent sections
comprise a block, and of which the block N and
portions of the blocks M and 0 only have been
illustrated. Each of these isolated sections is
provided with a track circuit which comprises
a battery B, the track rails l and a track relay
T in series. This track relay T comprises part of
the primary-secondary track relay combination
heretofore mentioned.
Since these various track
circuits are the same, each of the reference char- ‘
acters for the track batteries and track relays
have been provided with a pre?x corresponding
to the pre?x for the signal with which the track
circuit is directly associated.
,
. At the entrance to each block for each direc
tion of traffic is provided a wayside signal, and for
convenience the west bound signals have been
designated ISG and 3SG, whereas the east-bound
signals have been designated 2SG and 48G.
Each of these primary track relays is intercon
nected with an associated secondary track relay
‘1?, having a pre?x corresponding to the pre?x
of the associated primary track relay. Since like 40
parts employed in the control of each of the sig
nals are the same the control circuits and de
vices of the signal ZSG will only be described, like
parts for the remaining signals being assigned
like reference characters having distinctive ex
ponents or pre?xes, as the case may be.
As shown in the drawings the secondary relay,
or track repeater relay ZTP, is controlled by the
contact ll)2 of the primary track relay 2'1‘, and
this relay 2TP when energized includes through
the medium of its make-before-break contact I l2
a‘greater or less portion of the winding of the
track relay 2T, depending upon whether the sec~
ondary relay is in its energized or deenergized 55
2,125,243
Condition. In other words, when the repeater
track relay ZTP is in its retracted condition it ill-‘
cludes the entire winding of the track relay 2T,
whereas if the repeater track relay ZTP is in its
attracted condition it includes in the track 'c'irf
cuit only apo'rtion of the winding of the track
relay 2T. This expedient of changing the sensi
tivity of the track relay is resorted to in .order
s
to render the track relay more readily respon
sive to current when it is to be picked up and to
render it more responsive to the shunting action
of a train when it is energized and is to be ‘de
energized by such train.
to right through the blocks
‘N and 0. Let us
assume that such a train is moving in an east
wardly direction, {from left to right, in the block
M. The entrance of this train into. the block N
‘will cause deenergization of the track relay 2T,
which track relay 2T upon dropping will close a
pick-up circuit for the relay 2S and will break
the energizing circuit for the repeater track relay
ZTP. This closure of the back contact l32 of the
relay 2T will cause the relay 28 to be picked up.
Also, dropping of the repeater track relay 2TP
will cause opening of the contact I82 in the ener
gizing circuit of the relay 2HD, thus causing de
The signal ZSG is a three color aspect signal of -~ energization of this relay 2HD. Dropping of the
the multiple unit color light type, which. has no * . relay. 2HD will result in dropping of its contacts
15
moving parts, a particular color unit being. illu—,
122 and 242, thereby opening the pick-up circuit
minated under a particular condition of tra?ic.
The three color light units G, Y and R of this
signal ZSG emit color beams of green, yellow and
20
red, respectively, signifying clear, caution and‘
stop conditions, respectively. As is readily ap
parent from the circuits for these signal units,
the proceed lamp G is lighted when the home
distant relay ZI-I‘D is energized by current of posi
tive polarity, the caution lamp Y is energized
when this'relay ZHD is energized by current of
reverse polarity and the stop unit R is energized
when the relay ZI-ID is deenergized. .
Each signal has associated therewith the usual
. directional stick‘ relay, which, for the signal ZSG
comprises the. stick relay 23. This stick relay 2S
isprovided'with one pick-up circuit and two stick
circuits. The pick-up circuit for the relay ‘2S in
cludes the front contact ll2 of the relay ZHD,
and the back contact I32 of the relay 2T. One
‘ stick circuit for this relay 28 includes its own
heretofore traced for the relay 2S and closing the
second stick circuit for this relay 2S. Dropping
of relay ZHD will also cause the signal ZSG to
display'a danger indication by the lighting of the
red lamp. R. It is thus seen that the pick-up cir
cuit for the relay 2S is directly controlled by the
primary track relay 2T, whereas one of the stick
circuits. for. this relay 28 is controlled» by the re
peaterv track relay 2TP through the medium of
relay ZED, and that a certain amount, of time,
must elapse following the dropping of- the track
relay 2T, before the contact I22 of the’ relay 2HD
may‘ assume its. retracted position to break the
pick-up circuit, and that this time delay is in part
provided by the intervening secondary relay 2TP.
In other ‘words, the, pick-up circuit for the relay
28 is controlled by the primary, portion of; the
stick contact Hi2 and the backrcontact 242 of
train detecting mechanism, in that the track relay
'
_
e
'
polar armature and a neutral armature, and of
which the neutral armature will be retained dur
ing pole changing of the current for the relay;
this neutral armature being provided with an
auxiliary electro-magnet 52 inductively coupled
' to the main winding-‘of the relay, sothat during
pole'ohanging of’ the current in, the main wind?
a current is induced in, the auxiliary electro
' magnet 52 to holdthe neutral armature up during
ZT-Z'I’P in itself constitutes va rather sensitive
2T is so controlled by its repeater. track relay 2_TP 40
that it is sensitive to train shunting when in‘ its
attracted condition and is sensitive to train un
shunting when it is in its retracted condition.
As the train in question now. proceeds in an
eastward direction through the block N, it will,
uponleaving the ?rst track circuit ofv block N
allow the primary-secondary relay combination _
stick relay 28, for although ‘one stick circuit has 50
been broken at back contact I?!2 of the relay 2T,
the other stick circuit including back contact 242
tion is directed" to the patent to Larson‘ No.
. ‘1,852,210 dated April 5, 1932. This relay ZHD
Letuus now assume that the train in question
minal 3+ of a suitable source of current B lo
cated at the next signal location in advance, front
contact I62 of the'relay llHD, front contact vI‘!2
of the track repeater relay 3TP, front contact l82
of the repeater track relayl2TP, winding of the
relay ZHDv to a common return wire 0 connected
tothemidpoint of the source B at the next signal
in advance. Under caution tra?ic conditions this
' relay 2HD.is energized by current of the opposite
polarity through a circuit including in series the,
fronticontact I92 of- the stick relay 45, the back
contact TIE? of the relay 4HD, and the contacts
ligand I3?.heretoforementioned.
‘ Operation Figure 1
'
I
45
2qT-72TP to assume the attracted position. This
will- not, however, cause deenergization, of the
such pole changing; operation. Fora more "de
tailed description'of a relay of thisgtype attena
‘ is normally energized through a circuit which
may be traced as follows: beginning at the ter
35
ondary portion of this combination. Also, this
primary-secondary track Yrelay combination
’ The homeedistant relay 2HD is a relay of the,
polar neutral-retained type, which includes a
30'
primary-secondary track relay combination;
whereasthe stick circuit is controlled by thesec
stick contact 142 and the back contact I32 of the
relay 2T, and the other stick circuit includes the
the relay Z-HD,
25
of relay ZHD is still closed‘.
'
'
. ,
enters the block 0. When this occurs the stick
relay 4S willbe picked up and stuck up in the
same manner as, already explained in connection
with relay 28.‘ As the rear end of the train now
leaves theblock N the relays 3T—3TP pickup
and with the stick relay 48 now energized cur
rent of negative polarity is applied to the relay
2HD. This will cause the yellow lamp Y of the
signal ZSG to be lighted.
.
60
7
As the train under consideration now entirely
passes out of the block 0,’ the relay 4HD is re
energized. This causesthe relay 2HD to again
be energized by current of normal polarity, as a
result of which the signal lamp. G of thesignal
ZSG is again lighted. As this train continues its
eastward. journey the signal 4SG will be returned
to its normal clear condition, all in a manner as
In order to obtain a clear understanding or" the
already explained in connection with signal 28G.
operation of, the system, it is, believedvonly neces
' sarrierensider; tllargovement or atrainfrom left
Inf-Fig.‘ 2 has_been shown a. modi?ed form of
Figure 2
75
2,125,243
the present invention, also shown applied to a
single track portion including the block N and
portions of the blocks M and O. In this form of
the invention like parts have been designated by
like reference characters as corresponding parts
of Fig. 1. Also, like parts for each signal loca
tion have been designated by like reference char
acters with exponents or pre?xes corresponding
to that of the signal location at which it is lo
10 cated.
It will be noted that the track relays, re
peater track relays, and directional stick relays
have been identi?ed by the same reference char
acters as those shown in Fig. 1.
15
Attention is particularly directed to the fact
that movable spectacle light signals S1, S2, S3
and S4 have been shown instead of ?xed aspect
light signals ISG, 28G, 38G and 48G as shown
in Fig. 1, and that the light signals of Fig. 2 are
3
the mechanism of the signal S2 in its middle
biased‘ position the red color ?lter R intercepts
the light beam and causes a red signal indication
to be given thus manifesting danger ahead. For
a more detailed illustration and description of 5
this movable spectacle signal attention is di
rected to the prior application of Field Scr. No.
561,802 ?led September 8, 1931. Under normal
clear tra?ic conditions the repeater track relay
ZTP is energized through a stick circuit including ii)
the front contact 342 of the track relay 2T and
its own stick contact 352.
Operation Figure 2
Let us assume that there is a train moving 15
from left to right in the block M under clear
conditions of traf?c in advance. The presence
of the train in the block M will result in deener
directly controlled by a line circuit extending
gization of the repeater track relay ITP, result
as a result of which the home-distant relays HD
are omitted from Fig, 2 of the drawings. An addi
sulting in illumination of the lamp L2, thus man
ifesting to the engineer that traffic conditions
20 through the block to the next signal in advance
tional and slow acting relay GY, is also shown
for each signal location in Fig. 2, this relay GY
25 being energized when the signal mechanism as
sumes either the proceed (G) or the caution (Y)
position, and providing that the associated re
peater track relay is in its energized position.
Referring to the signal S2, for instance, this
30 signal includes only a single signal lamp L2 which
in the particular form of the invention illustrated
is energized only When the opposing track re
peater relay ITP is deenergized, as illustrated by
the circuit through the back contact 202 of the
35 track relay ITP, thus aifording the usual ap
proach lighting feature.
,
The structure of the signal S2 is such that if its
winding 2|2 is energized by current of normal
polarity the spectacle 222 is moved to its ex
treme right-hand position in which the green
?lter G intercepts the light emittedby the lamp
L2 so as to leave only green light in the emitted
beam, suitable lens structure of course being used
to produce a concentrated beam of light. Under
45 this condition the contact g assumes a right-hand
position and results in energizing the clear-cau
tion relay ZGY through a circuit including the
front contact 232 of the relay 2TP. Also, if the
winding 2| 2 of the signal S2 is energized by cur
50 rent of reverse polarity, the spectacle 222 is moved
to its extreme left-hand position, in which the
yellow ?lter Y intercepts the light from the lamp
L2 thus emitting a yellow beam of light. Under
this condition, the contact 9 of this signal mech
55 anism assumes a pendent position and the con
tact y assumes its left-hand position, thus caus
ing the energization 'of the clear-caution relay
2GY.
.
.
Under normal conditions the winding 2 l2 of the
60 signal S2 is energized through the following cir
cuit:—beginning at the terminal. (+) of a suit
able source of current at the next signal in ad
vance, front contact 212 of the relay llGY, back
contact 282 of the relay 3S, front contact 292
of the relay STP, front contact 302 of the relay‘
2T'P, winding M2, and front contact 3|2 of the
relay 4_GY to the other terminal (—) of said
source.
If now the winding 2| 2 of the signal S?
is deenergized, as it would be byatrain entering
the block N, the signal spectacle 222 will‘be turned
to its middle biased position, under which C0117;
dition the two contacts g and y will assume their
pendent position, in which position of the mech,
anism the pick-up circuit for the relay 2TP,
75. traced hereinafter, may vbe closed. Also, with
ing in closure of the back contact 202 and re
in advance are clear.
20
As this train passes the
signal S2, its treading upon the track circuit in
cluding the track relay 2T will cause deenergiza 25
tion of this primary track relay 2T and opening
of the front contact 342, as a result of which the
stick circuit for the secondary track relay TP
is broken, thus causing the repeater track relay
ZTP to also assume the retracted position. De 30
energization of the repeater track relay 2TP will
of course change the sensitivity of the track relay
2T by movement of the make-before-break con
tact II2 to its lower position. Also dropping of
the track relay 2T will cause closure of back con
tact 342 of this relay, thereby closing a pick-up
circuit for the relay 28, which includes the back
35
contact 342 of relay 2T and the front contact 362
of the relay ZGY. Also, dropping of the repeater
track relay ZTP will by dropping of its contact
302 result in deenergization of the winding M2
40
of the signal S2, and will further result in open
ing of the contact 232 included in the energizing
circuit for the relay ZGY. Dropping of relay
2GY will by closing its back contact 312 close a
stick circuit for the relay 28, which stick circuit
includes the stick contact 382 of the relay 23.
The stick relay 2S was, however, already stuck
up through a stick circuit including the back
contact 342 of the primary track relay 2T. It is
thus seen that the directional stick relay 25 is
picked up by dropping of the track relay ET and
is stuck up by dropping of the relay 2GY con—
trolled by the track repeater relay 2TP. It should
be noted that the pick-up and stick circuits for I I
the directional stick relays of Fig. 2 are the same
as those in Fig. 1 except that contacts of the
clear-caution relay are used instead of contacts
of the home-distant relay.
With the directional stick relay 28 now en 60
ergized, and with the relay ZGY deenergized,
current of negative or caution potential is applied
to the signal mechanism of the next signal in the
rear through a circuit starting at the terminal
(+) associated with the contact g, the contact 9
assuming its left-hand pendent position, the con
tact 1/ assuming its right-hand pendent position,
the front contact 40° of the directional stick re-
lay 23, the back contact 3l° of the relay ZGY, to
the next signal in the rear, and then back through
front contact 29° of relay ITP, back contact 28"
of relay IS and back contact 2-10 of relay ZGY
to the terminal .(—). It will be noted that the
line circuit extending from a particular signal
to the next signal in advance includes front con- 75
25,243
4
tacts of the two track repeater relal's of the
block along which this line circuit extends, and
that deenergization of these track repeater relays
will result in opening the line circuit and in short
ing it insofar as the portion of the circuit toward
the signal control windingll is concerned.‘ This
is done in order to afford additional protection,
so that the signal is not apt to be operated by
foreign current accidentally applied to the line
wire, as sometimes occurs by accidental crossing
of line wires.
-
.
.
As the train in question moves from left to
right through the block N the signal mechanism
for the signal S2 will of course remain in its
middle stop position, and the lamp L2 of this
signal will be extinguished as soon as the rear end
of the train has left the block 7M. Let us now
assume that the train in question enters the
block 0-.‘ In so doing the stick relay 4S will
be picked up in a manner as already explained
in connection with the stici; relay is.- As the
rear end of the train leaves the track ‘circuit in
plied tethenext signaiimtne ‘rear of'sig'nal s2
through the medium-(of fr r contacts 21° and
3l°vof this-relayirGY, Also, deenergization of
the stick're'le‘y is-results, this by reason of open
Ur
ing of vthe-[back contact 312v of relay ZGY, the back
contact v3ll2-a1rea'dy having been opened when the
rear'end of ‘the ‘train left the track circuit in
cludingthe primary'_ track circuitVZT. As the
train
fiiuestion now continues its movement
from lento right through the block 0, the sig
rial. S4 and all of the-relays associated therewith
ll)
will be "returned to their normal position as al
ready explained in connection with the signal 52.
The system shown in Fig. 2 of applicants’ dis
closure therefore not only discloses a system of
absolute-permisSive-blOck signaling in which a
directional stick relay is picked up through a
back contact of a primary relay and is stuck up
through a front contact’ controlled by a secondary
relay, of a primary-secondary track relay combi
nation in which the secondary relay changes the
sensitivity of the primary relay, but further pro
I
cluding the track relay 2T, this primary track vides means whereby the secondary relay 'of such
relay 2T will pick up, and the picking up of this trackrelay combination constitutes a stick-relay
primary relay 2T will result in picking up ‘of the which can only be picked up if the signal di
repeater track relay 2'I‘P' through the following
pick-up circuit-beginning at ‘the terminal (-1-)
of a local source of current, contact 9 of the sig
nal S2 assuming its pendent position, contact 3/
of this same signal assuming its pendent posi
tion, front contact 422 of the track relay 2T,
through the winding of the secondary track relay
ZIP to the other terminal (—) of said source.
It
position in response to deene'rgization of such
secondary relay. This stick feature of'the sec
ondary relay of the track relay combination
causes the next signal in the rear to remain at 30
stop in the event the associated signal sticks in
a proceed position, thereby advising the engineer
and'the signal maintainer that a signal has ac
should, however,
noted that this secondary
track relay ZTP would not have been picked up
cidentaliy stuck at clear ‘or caution, so that the
trouble may be corrected. In both forms of the 35
had the signal S2, for some reason or another,
stuck clear and not have assumed the stop
track relay combination performs the double
position.
‘
e
e
_
It is thus seen that if a signal, such‘ as-vthe
signal S2, for instance, should be stuck in its
clear or caution position even though a passing
train has deenergized the repeater track relay
ZTP the next signal in the rear could not receive
caution energy because the circuit to such signal
in the rear would be open at the contact g or y,
as the case may be. Also, since, the secondary
track relay 21? cannot be picked up under this
conditionthe relay 2GY would remain deenergized
and the clear circuit to the next signal in the
rear cannot be closed at front contacts 21° and
bl)
3 I0. In other words, the signal must follow each
invention
illustrated the primary-secondary
function of constituting a sensitive current de
tecting means for manifesting the presence or
absence‘ of a train on the track circuit and com
40'
prises a quick dropping primary track relay
which may serve to close a pick-up circuit for a
directional stick relay together with a secondary
track relay whichmay close, a stick circuit for
this directional stick relay which will hold such
directional stick relay energized until the entire
block in advance of such stick relay becomes un
occupied.
'
vHaving thus‘ shown and described several em- '
and the contacts '9 and y of the signal S". The
bodiments of the present invention to show how
the invention may be applied to different kinds
of wayside signals it should be understood that
the particular ‘embodiments selected'have- not
been selected to show the scope of the invention
but have been selected to illustrate the nature 55
of the invention and how it may be applied to
several well known forms of signaling systems,
and it should further be understood that various
changes and'modi?cations may be made to adapt
the invention to other signaling systems, all with 60
out departing from the spirit or scope of the
present invention except as demanded by the
application of this current of negative polarity
to
operation
the winding
of the‘M2
signal
of the
mechanism
signal S2towill
theresult
caution
position, Where the light beam is intercepted by
the yellow color filter Y, and in the event of
1. In a railway signal system of the absolute 65
pérmissive-block type, the combination with a
single track section of railway track, signals ca
deenergization of its relay TPcr the next signal
in the rear will remain thereafter at stop. As
the rear end of the train in question now passes
Ll Or
rectly'ass'ociated vtherewith has moved'to the stop
entirely out of the block N resulting in reener
gization of the repeater track relay3'I‘P, the sig
nal mechanism for the signal S2 will be energized
by current of negative polarity through a circuit
such as heretofore traced and including back
contacts 272 and 3!? of the clear-caution relay
60
4GY, the front contact 6612 of the stick relay 4S
a train moving from left to right in the block
M the lamp L2 of the signal S2 would be lighted
to produce such yellow color beam. This appli
cation of current of reverse polarity to the wind
ing 252 of the signal S2, and with'the repeater
track relay 2TP already energized, as heretofore
assumed, the relay ZGY is again energized, as a
result of which current of ‘positive polarity is‘ ap
scope of the following claims.
What we claim as new is:-
I
pable of indicating clear, caution and stop for
governing traffic in one direction through said
section, signals also capable of indicating clear,
caution and stop for governing traf?c in the op
posite direction-through said section, circuits for
governing said signals so‘ organized that the pas
sage of a train through said section will cause
all opposing signals to assume the stop condi
2,125,243
tion and to cause the signals governing traffic in
the same direction to assume a stop condition as
the train passes the same, a stick relay associ
ated with each signal for when energized tending
to cause the next signal in the rear to assume
a caution condition, a track relay associated with
each signal, a repeater track relay for each track
relay energized when such track relay is in its
attracted condition, means for changing the ef
10 fectiveness of the Winding of each track relay for
each unit of current flow in accordance with
whether said repeater relay is in its attracted or
retracted condition, a pick-up circuit for each
stick relay including a back contact of its asso
15 ciated track relay, and a stick circuit for each
stick relay including a contact controlled by its
associated repeater track relay and closed when
such repeater track relay is deenergized.
'
'2. In a railway signal system of the absolute
20 permissive-block type, the combination with a
single track section of railway track, signals ca
pable of indicating clear, caution and stop for
governing traffic in one direction through said
section, signals also capable of indicating clear,
25 caution and stop for governing trai?c in the op
posite direction through said section, a polar re
lay for each signal, a stick relay for each signal,
a circuit for each polar relay extending to the
next signal in advance and connected to a source
30 of one polarity when the polar relay associated
with said next signal is energized and connected
to a source of the reverse polarity when the
polar relay associated with said next signal is
deenergized and its associated stick relay is en
35 ergized, a track relay associated with each signal,
a repeater track relay for each track relay picked
up through a front contact of said track relay,
means for changing the e?ectiveness of the wind
ing of each track relay for each unitwof current
40 flow in accordance with whether said repeater
relay is in its attracted or retracted condition, a
pick-up circuit for each stick relay including a
back contact of its associated track relay, and a
stick circuit for each stick relay including a con
45 tact controlled by the associated repeater track
relay and closed when such repeater track relay
is in its retracted condition.
y
3. In an automatic block signaling system of
the absolute-permissive-block type, the combina
50 tion with a section of single track, of a polar
electro-responsive signaling device at the en
trance, to each block of said section for each di
rection of travel through said section, a direc
tional stick relay for each signaling device, a
55 circuit for each signaling device extending to the
next signaling device in advance and connected
to a source of current of one polarity when such
signaling device in advance is energized and
connected to a source of current of the opposite
60 polarity when such signaling device in advance is
deenergized and its associated stick relay is ener
gized, a track relay for each end of each block
one such track relay for each signaling device, a
65
repeater track relay for each track relay having
included in its energizing circuit a front contact
of said track relay, contacts on said repeater
track relay for rendering said track relay more
responsive to each unit of current whensaid re
70 peater track relay is in its retracted condition
than when in its attracted condition, a pick-up
circuit for each directional stick relay including
a back contact of the associated track relay, and
a stick circuit for each directional stick relay
including a contact closed in response to the de
5
energization of its associated repeater track re
lay.
4. In an automatic block signaling system of
the absolute-pern?ssive-block type, the combi
nation with a section of single track, of a polar
electro-responsive signaling device at the en
trance to each block of said section for each di
rection of travel through said section, a direc
tional stick relay for each signaling device, a cir
cuit for each signaling device extending to the
next signaling device in advance and connected
to a source of current of one polarity when such
signaling device in advance is energized and
connected to a source of current of the opposite
polarity when such signaling device in advance 15
is deenergized and its associated stick relay is
energized, a track relay for each end of each
block one associated with each signaling device,
a second stick relay, a pick-up circuit for said
second stick relay including a front contact of 20
its associated track relay and a contact closed
only if the associated signaling device is in its
stop condition, a stick circuit for said second
stick relay including a front contact of the as
sociated track relay, contacts on said second 25
stick track relay for rendering said track relay
more responsive to the ?ow of current when said
second stick relay is in its retracted condition
than when in its attracted condition, a pick-up
circuit for each directional stick relay including 30
a back contact of the associated track relay, and
a stick circuit for each directional stick relay in
cluding a contact closed in response to deener
gization of the associated second stick relay.
5. In a railway signal system, the combina 35
tion with a railway track divided into sections
by insulating joints, a track circuit for one of said
sections and including a track relay at one end
and a track source of current at the other end,
a movable spectacle signal adjacent said track 40
relay capable of indicating clear and stop, a sec
ondary track stick relay, means controlled by
said secondary track stick relay for changing the
responsiveness of said track relay to current in
accordance with whether said secondary track 45
stick relay is in its attracted or retracted condi
tion, a control circuit for said signal controlled
by a front contact of said secondary track stick
relay, a pick-up circuit for said secondary track
stick relay including a front contact of said track 50
relay and a circuit portion closed only when said
spectacle assumes the stop position, and a stick
circuit for said secondary track stick relay in
cluding only its stick contact and a front con
tact of said track relay, whereby said secondary 55
track stick relay cannot be reenergized if said
signal did not assume the stop position in re
sponse to deenergization of said stick relay.
6. In a railway signal system, the combination
with a railway track divided into sections by in
sulating joints, a track circuit for one of said
sections and including a track relay at one end
and a track source of current at the other end,
a movable spectacle signal adjacent said track
relay capable of indicating clear and stop, a sec
ondary track stick relay, contacts on said sec
ondary track stick relay which when in their
attracted position include less turns of the wind
ing of said track relay in said track circuit than
when in their retracted position, a control cir 70
cuit for said signal controlled by a front contact
of said secondary track stick relay, a pick-up
circuit for said secondary track stick relay in
cluding a front contact of said track relay and
a circuit portion closed only when said spectacle 75
6
2,125,243
assumes the stop position, and‘ a stick circuit for
said secondary track stick relay including only
its stick contact and a front contact of said track
relay, wherebyjsaid secondary track stick relay
LT cannot bereenergized if said‘ signal did not as
sume, the stop position in response to deenergiza
tion ‘of said stick relay.v
,
ergi'zingcircuit for said proceedv relay closed only
:when‘ said signal’ is in‘a proceed condition, a pick
upcircuit'for'said directional'stick relay‘ includ
ing' a'frontjcontact of said proceed relay and a
back contact of said track relay, and a stick cir- ‘
cuit for said directional stick rela'y including its
own ‘front contact‘and a back contact of said pro
'
"I; In a railway‘signal system, the combination
with'a railway track divided into sections by in
ceed
relay;
"
'
’
'
"
10. In combinatiom'a railway track having two
10, sulating joints, a'track circuit for onecf said adjacenttrack sections, a track circuit for‘each
sections and including a track relay at one end ’ track section. including'in series therein'a'pri
and a track source of current at the other end, mary track relay, a secondary track relay for
amo-vable spectacle signal adjacent said vtrack each primary relay for‘ changing the responsive‘
capable of indicating clear and stop, a secondary ness of said primary relay'to current'flow‘in' ac
track stick relay,'make-before-break contacts on cordance with whether said secondary‘ relay a's 15
said secondary track stick relay which when in sumes its attracted or retracted'position and-com
their attracted position include less turns of the trolled to repeat the position of said primary re
winding of said track relay in said track circuit lay, a directional stick relay',ia'pick-up circuit
than'when- in‘ theirretracted- position, a control for said directional stick'relay- including aback
contact of a. primary relay 'ofrone track section 20
‘circuit for said signal controlled by a, front con
anda front'contact controlled by the secondary
tact‘of said secondary track’ ‘stick relay, a pick
up circuit for said secondary track stick relay relay of the next track section'in' advance, and
including a front'contact ‘of said track relay and a stick circuit for said stickrelay controlled by
a circuit portion closed only when said spectacle said secondary relay~0f the next track section in
'
'1
'7 25
vassumes the stop position, and a stick circuit for advance. ;
11. In combination-,a railway track having two
said secondary track stick relay including only
itsstick‘contact and "a front contactof said track 7 adjacent track sections, a track circuit for each
relay, whereby said secondary track stick relay track section including in‘ series therein’ a pri
mary track relay, a secondary track relay for
cannot be ,reen'ergized if said signal did not as‘
each primary relay“ for changing the responsive 30
30 sume the stop position in response to deenergi
ness of said primary-relay to'current flow in
zation'of said stick-relay;
_' a '
8.v In a railwaysignal system; the, combina~ accordance with'whether said secondary relay ase
tion With'a wayside signal of the movable color sumes ‘its attracted ‘or-retracted’ position and
aspect ‘typev capable of - indicating proceed’ and controlled.- to- repeat-the position ‘of said primary
relay, a ‘directional stick, relay, 1 a pick-up ‘circuit 35
stop, of a track circuit directly ahead of said sig
nal including the usual track source of current ' for said directional stick relay including a back
contact of a'primary relay of one track section
and a primary track relay of a primary-second
ary track relay combination, said primary-sec
and'a contact closedlonly if the associatedsecond
4-0
ondary track relay combination including a sec
ary relay andethe» secondary relay of- the [next
ondary relay for changing the pick-up sensitivity
of said primary relay to current flow in accord
ance with whether said secondary relay assumes
track section in=advance~~areenergized, and a
its attracted or its retracted condition, a ‘circuit
- l2~.~ Ira-combination, a primaryVtrack-relay in
-
,- a
for operating said signal to the clear position
cluded in'a normally closedtrackcir'cuit for a
railway» track section, a a’ secondary track a relay
cluding a front’ contact of said primary relay
repeat the condition of such'primar-y relay-and in
andrcontacts of said signal closedsonly if said
turn changev the responsiveness of such. primary
relay to thel?ow-ofjcurrent in accordance with
cuit for said secondary relayincluding its own
front contact and a front contact of said pri
associated with» said primary jirelay- controlled to
whether said secondary 'relay- assumeswits Vat
tion with a wayside signal of the movable color
tracted orzretracted position,- a pick-up circuit for
said~secondary-,relay»inc1uding a front contact
of ‘its associated primary'relay and a back con
tact of an electro-respons'ive means which electro
aspect type capable of indicating proceed and
responsive means‘ is controlled ‘by said secondary
stop, of a track circuit directly ahead of said
signal including the usual track source of cur
rent and a primary track relay of a primary
including a-{ront contact of saidrprimary relay,
whereby said secondary- relay cannot" be, picked
secondary track relay combinatiomsaid primary
up until said relectro-responsive» means has fol
mary relay.
_
V
n
9. In a railway signal system, the combina
55
secondary relays is deenergized.
including a front contact of said secondary re
lay, a pick-up circuit for said secondary relay in
signal assumes a stop position, and a stick cir
50
stick circuit closed at least as long as one of said
secondary track relay combination including a
60
secondary relay for changing the sensitivity of
the Winding of “said primary relay to the flow of
current in accordance with whether said sec
ondary, relay assumes its attracted or its re
tracted condition, a circuit for operating said
65
signal to the clear position including a front
contact ofsaid ‘secondary relay, a pick-up cir
cuit for said secondary relay including a front
contact of said primary relay and contacts of
70 said signal closed if said ‘signal assumes a stop
relay and a stick circuit _for said'secondary relay
lowed the previous deenergization of said second 60
ary
relay.~.
~Y
,
_
r,
r
'
.7 13.» In afrailway signal system, the combination
with a railway track divided ‘into sections by
insulatingv joints, a track circuit'for one of said
sections and including a track relay at one end '
and a track source of current’ at the other end, a
railway signal adjacent said track relay, capable
of indicatingclear and stop, a secondary track
stick relay, ri-ieans controlled by'said secondary
track stickrelay for changing thev responsiveness '
position, and a stick circuit for said secondary of said track'relay to current flow in accordance
relay including its own front contact and a front with whether said second'arytrack‘stick relay
contact of said primary relay, a directional stick ' is'in its attracted or retracted condition, a con
relay for indicating the direction of movement trol circuit for said, signal vcontrolled by a from
contact of saidqsecondary Itrack ‘stick .relay', a
75 of a train by said signal, a proceed relay, an en
7
2,125,243
pick-up circuit for said secondary track stick
relay including a front contact of said track relay
and a contact closed in response to opening of
said control circuit, and a stick circuit for said
secondary track stick relay including only its
stick contact and a front contact of said track
relay, whereby said secondary track stick relay
cannot be reenergized if said control circuit was
not opened in response to deenergization of said
stick relay.
14. In combination, a track circuit, a primary
track relay included in said track circuit, a sec
ondary track relay of the stick type, a pick-up
circuit for said secondary relay including a front
contact of said primary relay and a contact of an
‘:electro-responsive device closed only when said
electro-responsive device isrdeenergized, a stick
circuit for said secondary relay including its own
stick contact and a front contact of said primary
20 relay, means controlled by said secondary relay
to cause said primary relay to be more responsive
to the ?ow of current when said secondary relay
is deenergized than when energized, and a. circuit
for said electro-responsive device controlled said
secondary relay.
15. In combination, a primary track relay in
cluded in a normally closed track circuit for a
railway track section, ,a secondary track relay
associated with said primary relay controlled to
repeat the condition of such primary relay and
in turn change the responsiveness of such primary
relay to the flow of current in accordance with
whether said secondary relay assumes its at
. tracted or retracted position, a pick-up ‘circuit for
said secondary relay including a front contact
of its associated primary relay and a contact of
an electro-responsive means controlled by said
secondary relay which responsive means is ener
gized in response to energization of said second
40 ary relay and which contact is closed when said
electro-responsive means is deenergized, a stick
circuit for said secondary relay including a front
contact of said primary relay, and a railway’
45
signal controlled by said electro-responsive
means, whereby said secondary relay cannot be
picked up until said electro-responsive means has
followed previous deenergization of said second
ary relay.
16. In combination, a primary track relay in
cluded in a normally closed track circuit of a
railway track section, a secondary stick relay, an
electro-responsive device controlled by said sec
ondary stick relay, a pick-up circuit for said
secondary stick relay including a front contact
55 of said primary track relay and a contact of said
electro-responsivedevice, a stick circuit for said
secondary stick relay including a front contact
of said primary track relay, and means for chang
ing the responsiveness of said primary track relay
GO to flow of current in said track circuit in accord
ance with whether said secondary stick relay is
in an energized or deenergized condition.
1'7. In a railway signal system of the absolute
permissive-block type, the combination with a
single track section of railway track, signals
capable of indicating clear, caution and stop for
governing tra?ic in one direction through said
section, signals also capable of indicating clear,
caution and stop for governing traffic in the oppo
site direction through said section, circuits for
governing said signals so organized that the
passage of a train through said section will cause
all opposing signals to assume the stop condition
and to cause the signals governing tra?ic in the
775
same direction to assume a stop condition as the
train passes the same, a directional stick relay
associated with each signal and which when
energized tends to cause the next signal in the
rear to indicate caution, a section of track ahead
of each signal having a track circuit including a
primary track relay in series therein, a second.
ary track relay energized through a front con
tact of said primary track relay and which sec
ondary relay when energized renders said primary
relay less responsive to current ?owing in said 10
track circuit, a pick up circuit for said directional
stick relay jointly controlled by said primary and
secondary track relays, and a stick circuit for
said directional stick relay controlled by said
primary track relay independent of said second
ary track relay.
18. In a railway signal system, the combination
with a wayside signal of the movable color aspect
type capable of indicating proceed and stop, of
a track circuit directly ahead of said signal in
cluding the usual track source of current and
a primary track relay of a primary-secondary
track relay combination, said primary-secondary
track relay combination including a secondary
relay for changing the current value at which
said primary relay will pick up in accordance with
whether said secondary relay assumes its at
tracted or its retracted condition, a circuit for
operating said signal to the clear position includ
ing a front contact of said secondary relay, a
pick-up circuit for said secondary relay includ
ing a front contact of said primary relay and a
circuit portion including contacts of said signal,
said circuit portion being closed only if said signal
assumes a stop position, and a stick circuit for
said secondary relay including its own front con
tact and a front contact of said primary relay, a
directional stick relay for indicating the direction
of movement of a train by said signal, a proceed
relay, an energizing circuit for said proceed relay
closed only when said signal indicates caution or
proceed, a pick-up circuit for said directional
stick relay including a front contact of said pro
ceed relay and a back contact of said track relay,
a stick circuit for said directional stick relay in 45
cluding its own front contact and a back con
tact of said proceed relay, and means for con
trolling the next signal in the rear controlled by
said directional stick relay.
19. In a railway signal system, the combination 50
with a wayside signal mechanism of the movable
color aspect type capable of indicating proceed
and stop, of a track circuit directly ahead of said
signal mechanism including the usual track
source and a primary track relay of a primary
secondary track relay combination, said primary
secondary track relay combination including a
secondary relay for changing the picking up
sensitivity of said primary relay to current ?ow
in accordance with whether said secondary relay
assumes its attracted or its retracted condition, a
circuit for operating said signal mechanism to
the clear position including a front contact of
said secondary relay, a pick up circuit for said
secondary relay including a front contact of 65
said primary relay and contacts of said signal
mechanism closed if said signal mechanism
assumes a stop position, a stick circuit for said
secondary relay including its own front contact
and a front contact of said primary relay, and
a signal lamp for said signal mechanism con
trolled by the approach of a train.
'
EDWIN C. LARRY.
MORTON C. TWITCHELL.
75
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