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Патент USA US2405860

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Aug. 13, i946.
H. A. THOMPSONA
2,405,860 -
RAILWAY ATRAFFIC CONTROLLING APPARATUS
Filed Feb. 19, 1944'
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' Aug.l 13, 1946.
H. A. THOMPSON
2,405,860
RAILWAY TRAFFIC CONTROLLING APPARATUS
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Filed Feb. 19,
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Patented Aug. 13, 1946
2,405,860
UNITED STATES PATENT OFFICEY
2,405,860
RAILWAY TRAFFIC CONTROLLING
APPARATUS
Howard A. Thompson, Edgewood, Pa., assigner to
The Union Switch & Signal Company, Swiss
vale, Pa., a corporation of Pennsylvania
Application February 19, 1944, Serial No. .523,065
7 Claims.
l
My invention relates to railway traflîc control
ling apparatus, and particularly to apparatus
employing track circuits supplied with periodical
ly interrupted or coded current for controlling
Wayside and/ or cab signals.
The principal object of my invention is to im
prove the shunting sensitivity of track circuits of
the type described.
Another object of my invention is the provision
of means for supplying to a coded track circuit a
high voltage impulseouring the “on” period of
each code cycle in a way which does not increase
Wear on the contacts of the coding relays.
(Cl. 246--38)
2
place of the high voltage relay at the battery end
of the track circuit and the two repeaters of this
relay for checking that a high voltage impulse is
being supplied to the track circuit during each
“on” period of the code in the intended manner,
another high voltage relay having its one wind
ing connected in multiple with the track relay
and its other winding connected to a suitable
source of current over a stick circuit including its
own front contact and a contact of the track re
layl This latter relay performs the same func
tions that are performed by the track relay in the
arrangement ñrst described.
A further object of my invention is to provide
Other objects and characteristic features of my
novel means for checking that a high voltage im 15 invention will become apparent as the description
pulse is actually present during the “on” period
proceeds.
of each code cycle.
I shall describe two forms of signaling systems
According to my invention, I connect the sec
embodying my invention, and shall then point out
ondaiy winding of an impulse transformer in
the novel features thereof in claims.
seriesA with the track battery from which coded 20 In the accompanying drawings, Fig. 1 is a
current is normally supplied to the track circuit,
diagrammatic View showing one form of appara
and I energize the secondary winding of this
tus embodying my invention. Fig. 2 is a diagram
transformer over a contact of the relay which
matic view showing the nature of the track circuit
codes the track circuit energy in a manner to
current obtained with the apparatus shown in
cause the transformer to supply to the track cir 25 Fig. 1. Fig, 3 is a View similar to Fig. 1 showing a
cuit during the “on” period of each code cycle a
modification of the apparatus illustrated in Fig.
high voltage impulse of less duration than the
l, and also embodying my invention. Fig. 4 is a
“on” period of the code cycle, whereby the cod
diagrammatic view showing the nature of the
ing relay contacts do not interrupt the high volt
track circuit current with the apparatus shown
age energy. I further connect in series with the 30 in Fig. 3.
track battery and the secondary winding of the
impulse transformer the one winding of a two
winding high voltage checking relay and a front
Similar reference characters refer t0 similar
parts in each of the several views.
Referring first to Fig. 1, the reference charac
contact of a ñrst repeater of this checking relay.
The other winding of the high voltage relay is 35 ters l and la designate the track rails of a stretch
of railway track over which traiiìc normally
constantly connected to a source of direct current,
moves
in the direction indicated by the arrow,
and the parts are so proportioned that when said
that is to say, from left to right in the drawings.
one winding is deenergized the relay will close a
These rails are divided by means of insulated
normal contact, but that, each time a high volt
joints
2 into blocks, only one of which E--G is
age impulse is supplied to the track circuit the 40
shown complete in the drawings, and this block,
resultant energization of said one winding by this
in turn, is further divided at point F by means of
impulse will cause the relay to close a reverse
other insulated joints 2 to form two track sec
contact. A second repeater of the checking relay
tions IT and AIT.
is energized over said reverse contact in` such
Traiiîc entering each block is controlled by a
manner that this relay will remain continuously 45 signal
designated by the reference character S
energized as long as said high voltage relay oper
with a distinguishingsufûx corresponding to the
ates its contacts in step with the code, and said
location. These signals may be of any suitable
ñrst repeater relay is energized over said normal
type,
but in the well known form here shown
contact and a front contact of said seco-nd re
these signals are color light signals and each com
peater relay in such manner that it will remain 50 prises a red lamp R, a yellow lamp Y, and a green
continuously energized as long as said second re
lamp G, which lamps when illuminated indicate
lay is energized and said high voltage relay con
“stop,” “approach” and “clean” respectively.
tinues to operate its contacts in step with the
Eachtrack section is provided with a track cir
code.
cuit comprising a code following track relay con
In an alternative arrangement, I employ in 55 nected across the rails at the entering end of the
2,405,860
3
section, and~ means located at the leaving end of
the section for supplying to the rails of the sec
tion coded direct current the code frequency of
which is controlled by traiiic conditions in ad
vance.
4
with the parts arranged in this manner a high
Voltage impulse will be impressed on the rails of
the associated section during each "on’ period
of the code, but that this electromotive force will
not increase the wear on the contacts of relay
5
ICTM since these contacts do not interrupt the
circuit during the presence of this impulse. It
will be obvious, of course, that a voltage will
also be induced in secondary winding l of trans
type capable of operating its contacts in step Al0 former TG each time the energizing circuit for
primary winding I2 becomes closed at contact
with the pulses of coded current supplied to .the
_I1I, but due to the previously referred to adjust
rails. In actual practice each of these relays will
ment of the contacts 5 and II, and the time con
usually be of the biased polar type because of
stants of _the circuit, the magnitude of this elec
the greater sensitivity of this type of relay.
tromotive lforce will be negligible insofar as the
The means located at the leaving end .of each .
Voperation of the contact 5 is concerned, and no
section for supplying coded current to the rails
Vappreciable Voltage will be impressed on the rails
of the associated section varies slightly accorddue to the closing of the contact I i. The nature
ing as these means are disposed at a signal loca
of >the .resulting code is illustrated diagrammati
tion or at a cut section location. Referring par»
ticularly to the means located at the signal loca- L cally in Fig. 2, where curve b represents the ap
proach or 75 code and curve c represents the
tion YG, which means are typical of the means
clear or 180 code.
located at each of the other signal locations,
The winding I5 of the high voltage relay iHVR
these means in the form here illustrated `corn
is >constantly energized by an associated battery
prise a battery o connected across the rails in
series with the front contact 5 of a code repeater 3:. I6, and the parts of this relay are so proportioned
that when the winding I5 only is energized, as
relay iCTM, a current limiting resistance 6, the
will be the case during the “off” -periods of the
secondary winding ‘I of a transformer TG, the
code, the contact I'i-lîa will become closed.
one -winding 8 of a two winding high voltage
However, when the winding 8 is also energized,
polar stick checking relay II-WR, and the front
contact S-Qa »of a iirst repeater relay II-IVBSA 3o as will be the case during the “on” periods of
Each code following track relay is designated
by the reference character R with a prefix cor
responding to the reference character for the
associated section, and may be of any suitable
>of the associated checking relay.
.the code, a flux is set up in the core of the relay
~
The code repeater relay ICTM may be con
trolled through the medium of the track Vrelay
for the section next in advance ina well known
manner not shown to cause it >to operate its con
tacts 5 and Il at one or another of therusual
plurality of code rates. Selection .among these
code rates, which rates in actual practice in a
three block signaling system will usually com
prise 75 or 18() times per minute depending upon
'whether the block to the right of block E-G is
occupied or unoccupied, may be made Vby Ythe
usual decoding ,apparatus It controlled by the
track relay AZTR for »the track section AZT, It
will be seen, therefore, that when relay ICTM.
is operating, >the resultant .operation `of its con
tact 5 will act >to :interrupt or `code the current
supplied by the associated track battery ‘li Aat "75
by the current flowing in the winding 8 which
flux opposes that due to the current flowing in
winding I5, and the parts are further so propor
tioned that under these conditions the relay will
close its contact I'l-I'Ib if the high Voltage im
pulse is present but will retain its contact I'I--I ‘Ia
Vclosed if the high voltage impulse is absent. It
follows, therefore, that the relay IHVR will alter
nately open and close its contacts I‘l-I'Ia and
l'I-I'Ib in step with the coded current supplied
to the rails I and Vict if the high voltage impulse
is present during each “on” period of the code,
but >will retain its contacts Iï-il’a continuously
i. . .A closed if this high voltage impulse is absent.
"
The repeater relay Il-IVBSA referred to here
or 180 times per minute ldepending upon whether
the block to the right of section E-G lis occu».>-`r
pied or unoccupied. Each interruption >is of such
inbefore is energized over a circuit which Vpasses
from terminal B of the source through contact
I‘I-I'Ia of relay IHVR, a front contact I8 of a
second repeater relay {HVFSA and a resistance
`I5 connected in multiple with the winding of
relay II-IVBSA to terminal C. The second re
duration that the resulting code will consist of
peater relay IHVFSA, in turn, is energized over
code cycles each comprising substantially equal
a circuit which passes from terminal B through
“on” and “off” periods.
The contact II of relay ICTM controls 'the -sup- c55 contact I‘I'--Ilb of relay IHVR, and a condenser
20 connected in multiple with the winding of re
ply of current to _an energizing circuit for the
lay IHVFSA to terminal C’. It will be seen,
primary winding I2 of transformer TG. This
therefore, that when relay IHVR is operating,
energizing circuit includes in addition to the con
relay IHVFSA will become energized each time
tact EI, a suitable source of current the positive
and negative terminals of which are designatedí??‘û contact I'l-I‘Ib of relay Ill-IVR becomes closed.
-The condenser 20 renders the relay IHVFSA slow
B and C, respectively, and a condenser I3 con'
to release, and the parts are so proportioned
nected in multiple with the primary winding I2.
that relay IHVFSA will maintain its front con-It will be seen, therefore, that each time vrelay
tact I8 continuously closed as long as relay IHVR
ICTM closes its back contact it, energy will be
stored in the magnetic _circuit of transformer TG ¿o5 continues to alternately open and close its con
tacts at any one of the usual code rates.
and also iin condenser I3, whereas each ltime
As long as contact I8 of relay lHVFSA re
relay ICTM opens contact II, the energy stored
mains closed, relay IHVBSA will become »ener
in the transformer and condenser will cause a
'gized each time relay IHVR closes its contact
relatively high _electromotive force to be induced
I‘I-I‘Ia, and the relay II-IVBSA is rendered suf
inthe secondary winding 'I of transformer TÍG.
ñciently slow releasing by the resistance I9 so
>The contacts 5 and `II of relay :ICTM are so
that it will maintain its front contact continu
adjusted that this induced electromotive force
ously closed as long as relay IHVR continues to
will be initiated immediately after the closing of
contact .5, and will'be substantially expended be
follow the code.
.
fore contact'E again opens, and it follows >that 5f’ i It Will benoted that the snub or closed circuit
7
2,405,860
S
ate at the 75 code rate, and signal SE willthere
upon display its approach aspect.
The parts Will remain in the positions just
described until the train vacates the block of
which section AZT forms a part. When this hap
pens, the 75 code energy will be supplied to sec
tion A2T and track relay AZTR will follow this
code and will act through the decoding apparatus
i0 to cause signal SG to display its approach as
«cause of the fact that back contact coding is em'
ployed at location F, as pointed out hereinbefore.
With this arrangement, the energizing circuits for
the primary windings of the transformers TG and
TF Will not become interrupted until the expira
tion of a short time interval after the “on” period
of the code is established by the closing of the
front contact 5 of relay ICTM or the back con
5 of relay ITRA, and it follows therefore that
pect. Furthermore, relay l CTM will start to op 10 tact
the high voltage impulse Will not be established
erate at the rate of 180 times a minute, and Will
thus cause 1‘80 code to be supplied to section IT,
until a short period after the start of the “on”
period of each code cycle. This is shown dia
and hence to section Ai T, whereupon signal SE
grammatically in Fig. 4. This arrangement pro
»will display its proceed aspect.
vides more positive action and consequently more
When the train vacates the block next in ad 15 positive protection against burning of the con
tacts than is provided with the -apparatus shown
part,
vancesignal
of theSG
block
will of
display
whichitssection
proceed
AZT
aspect
forms
and
in Fig. l as a consequence of the fact that the
all parts will be restored to the positions in which
high voltage impulse is initiated substantially
they are shown in the drawings.
simultaneously
the establishment of the
It should be particularly pointed out that with 20 “on” period of thewith
code.
the apparatus constructed in the manner de
Furthermore, in the alternative arrangement
scribed, the presence of the high voltage impulse
of circuits -shown in Fig. 3, I employ in place of
during the “on” period of each code cycle acts
the high voltage checking relay and the asso
to break down any high resistance ñlm or coating
front and back contact repeaters of these
which may be present on the rails, thereby insur 25 ciated
relays
a't
the battery end of each track circuit to
ing a shunting effect of the Wheels and axles of
check that a high voltage impulse is being sup
a car or train under conditions where a'lower
plied to the associated track circuit during each
voltage Would be insufñcient. The magnitude of
“on” period of th'e code in the intended manner,
the high voltage impulses may be made many
times the usual track circuit voltage, and since 30 an auxiliary track relay located at the track relay
end of the track circuit. These auxiliary track
no part of the high voltage impulse is present at
relays are designated by the same reference char
the time the coding contacts of the various cod
acters as the reference characters for the associ
ing relays are either opening or closing,vtl1e pres»
ated track relay with the sufnxA, and may be
ence of these impulses does not produce additional
generally similar to the track relays except for
wear on these contacts. It might also be men 35
the fact 'that each relay is provided with two
tioned that since a high voltage impulse is pres
ent during each “on” period of the code, these
impulses are available to break down the resist
ance of the wheel to rail contacts as the car or
train moves from point to point along the track.
It should also be particularly pointed out that
with the apparatus constructed in the manner
just described if the high voltage impulse fails for
windings. The winding 8 of each of these aux
iliary relays'v is connected in multiple with the
Winding of the associated track relay, while the
other Winding l 5 of each of these auxiliary relays
40 is energized over a stick circuit which includes a
battery 2t, a front contact 2s of the associated
track relay and its own front contact 25. The
any reason, the resultant underenergization of the
parts of each of these auxiliary relays are so pro
cause the associated BSA checking relay to be
come deenergized. The deenergization of this re
and that when either one of these relays closes
winding 8 of the associated high voltage relay 45 portioned that th'e relay Will become energized
to a suñ‘ìcient extent ‘to cause it to close its front
will result in the failure of this relay to operate
contacts during each “on” period of the code if
its contacts in step with the code, and will thus
and only if the high voltage impulse is present,
lay will interrupt the track circuit at its front 50 its front contact 25, the energy supplied to its
winding l5 over the associated stick circuit will
contact S-Sa, and Will thus cut off the supply
then be sufficient to retain the front contacts
of coded energy to the track relay. This will
closed during the remainder of th'e “on” period
result in the signals moving to their Stop posi
which caused the contacts to become closed. If
tions so that the failure Will be sure to be quickly
the stick circuits were not provided, the auxiliary
detected.
relays
would be only momentarily energized dur
Referring now to Fig. 3, I have here shown
ing the high Voltage impulse, and the stick cir
an alternative arrangement of circuits in which
an auxiliary code following repeater relay ICTMM
of relay ICTM is provided at location G for con
cuits provide a means for insuring that .the front
and back contacts of the auxiliary track relays
will be closed for approximately equal periods of
trolling the energization of the primary Winding 60 time.
i2 of transformer TG, and a similar repeater re
The auxiliary track relays may be utilized to
lay ITM controlled by an auxiliary track relay
perform
the functions that are performed by the
ETR/A presently to be described is provided at
regular track relays in Fig. 1, and When so used,
location F for controlling the energization of the
if the high voltage impulse is not present during
secondary winding l2 of transformer TF. The
the “on” periods of the code, the auxiliary relays
energizing circuits for relays ICTMM and ITM
will fail to operate. This will cause the signals to
are obvious from an inspection of the drawings,
indicate stop and will thus result in immediate
and it Iwill be apparent that each time relay lCTM
detection of the failure.
or auxiliary track relay ITRA becomes energized,
The operation as a whole of the apparatus’
the associated repeater relay will become ener 70
sh'own in Fig. 3 is generally similar to the opera
gized at the expiration of a short time interval
tion of the apparatus shown in Fig. 1, and it is
thereafter. The primary winding i2 of trans
accordinglybelieved
that this operation will be
former TG is energized over back contact 22 of
apparent from the foregoing description and from
relay ICTMM, while that of transformer TF is
energized over front contact 22 of relay ITM be~
an inspectionof the drawings Without further de'
tailed description.
'
`¿scarico
which is provided for relay ,II-IVFSA to Vrender
it slow releasing comprises a condenser, While
that provided Vfor .relay IHVBSA comprises Ia re
sister.
The reason .for this Ádiii’erence Ain the
snubs for the -tWo relays is that the contact
I'l-I'Ia of relay -IHVR -is closed for .a shorter
portion of each code vcycle than the contact
>6
as a whole, I shall assume that a train lmoves
from left to right over vthe stretch of track shown
in the drawings.` When the train enters section
AIT, the train shunt will cut olî the supply of
coded energy to the track relay AITR, and this
track relay will >therefore become deenergized
and will cause signal SE to display its stop aspect.
When the train enters section IT, track relay
Il-Ilb, Aand a resistor snub will not provide a
ITR. will become deenergized. This will cut off
'suiîiciently slow release time for the relay
10 the supply of coded current to section A'iT and
II-lÉV-FSA.
also to winding 8 of relay AIHVR, and contact
rIt will also be noted `that while relays II-IVFSA
H-Ha of relay AI-HVR will `therefore become
and 'II-IVBSA will both he energized as long as
closed, so that relay AIHVFSA will now become
relay IHVR, follows the code, if relay II-IVR
deenergized and will deenergize relay AIHVBSA.
stops following the code for any reason jrelay
II-IVBSA Awill become deenergized and will open 15 The deenergization of relay AIHVBSA will com
plete t-he restoring »circuit for winding 8 of relay
its front contact S-Sa and close its back .con
AIHVR, .but since this circuit -will not »be sup
tact 9-9‘11 The opening of »contact S-Sa will
plied With high voltage impulses under these
disconnect the `battery 4 and :secondary winding
conditions, contact -I Y'l--I'la of relay AIHVR will
l of -transformer TG from the track circuit-while
the closing of back contact V9--Sli will -complete 20 remain continuously closed. Furthermore, due
to the absence of coded current in section AIT
a restoring circuit for relay II-IVR. passing vfrom
track relay AITR, will now remain deenergized,
battery 4 through resistor ‘5, secondary winding
and will cause signal SE to continue to display >its
'I `of transformer TG, winding 8 of relay IHVR,
stop aspect even though the train completely va
back contact S-Sb of relay lli-IVBSA and con
cates section AIT.
tact 5 of relay I CTM to battery 4. This latter
When the train enters section AZT, track relay
circuit permits the equipment to reset itself
AZTR. will become deenergized and will cause
should the coding action oi relay ICTM be
signal SG to display its stop aspect. The «deen
stopped for any reason.
ergization of track relay AQTR will falso function
Referring >now to the cut section location F,
the means here shown for supplying coded cur 30 through the medium of »the decoding apparatus
Ill to cause relay ICTM to operate at the rate of
rent to the rails of section AIT is identical with
75 times per minute, but this change in the rate
that just described at location `Gf for supplying
of operation of relay ICTM will not have any
coded current kto the rails of section IT except for
eíîect on the remainder of the apparatus as long
the fact that the >coding action at this location
as any part oi the train remains in section IT.
instead of being effected by means of a code re~ , >
However, as soon as the train vacates section
.peater lrelay is effected by the track relay ITR.
iT,
the resultant removal of the `train shunt per
which "functions to repeat the code to section AIT.
mits the ‘F5 code energy supplied >to the rails of
Itis ‘believed -to be unnecessary therefore to de
section IT to operate track relay ITR. The first
scribe this means in detail. It should be noted,
however, that the contact 5 of relay lTR which s. time relay ITR picks up and Acloses its front con
tact I I, energy becomes stored in the transformer
eiîects the coding of the track circuit energy is
TF, and when this relay next releases and closes
a back contact, while the contact I I of relay ITR
its back contact 5, lthis stored energy causes a
which controls the -energization of the primary
high voltage impulse to be supplied to the wind
winding I2 «of transformer TF is a front contact
so that the “on” periods of the code in section ~
AIT occur during the “Voli” period of the code
in section IT.
The use of a back contact of the
track relay at the cut section location instead
»of a front contact to repeat the code is a well
known expedient to minimize code distortion, «
and for the _purpose of my present invention it is
immaterial Whether a back or a front contact is
employed.
The track relays AITR and A2'I‘R control the
associated signals YSE .and SG through the me
dium of suitable decoding apparatus IEB. This
decoding apparatus may, for example, be similar
lto that shown and described in Letters Patent
of the United States No. 2,218,l20, granted to
Frank H. Nicholson and Leslie R. Allison on Oc- "'
tober 15, 1940, -for Railway traiiic controlling ap
paratus, land it is believed, therefore, that for
`purposes of the present application it is sufficient
to point out that the lamp G, Y, or R of these
signals will -be lit to indicate “clean” “approach,”
or “stop” .according as the associated track re
ing 3 `of relay AIX-IVR by virtue of the restoring
circuit which i's then closed at back Contact 5
of relay ITR and at back contact Q-äb of relay
AIHVBSA. This high voltage impulse causes re
lay AIHVR to open its contact 'I1-«Ila and close
its contact I'I-Iîb, whereupon relay AIHVFSA
picks up. Due to the previously described pro
portioning of the parts, the duration of this high
voltage impulse is relatively short, and on the
termination of this impulse the energy supplied
to Winding I5 of relay All-IVR from battery Iâ
causes contact I'l-I‘îb to open and contact
H-I‘la to again close. Since contact I3 of relay
A‘iI-IV’E‘SA is closed when contact Iï-I'lc he
cornes closed under these conditions, the closing
of 'Contact Il--I'Ic completes the energizing cir
cuit iOr relay AEHVBSA and this relay then picks
up. The picking up of this relay, in turn, inter
rupts the restoring circuit for relay AIHVR and
reestablishes the track circuit, so that subsequent
operation of the track relay lTR in step with the
coded current supplied to track section IT causes
coded current of the same frequency to he sup
lay is supplied with 180 code, 75 code, or no code.
As shown in the drawings, sections AIT, IT
and `AZT are all unoccupied, and assuming that
the section next in Vadvance of section AZT is
also unoccupied, all three of the sections AIT, IT
and AZT will be supplied with 180 code energy.
Signals SG and SE will therefore both indicate
picking up of .relay AI‘I-WBSA will not occur dur
ing the duration of the high voltage impulse so
that the contact S-Eb does not have to be a high
proceed.
section AIT will cause track relay AITR to oper
In explaining the operation cf the >apparatus
plied to .section AET.. The proportioning of the
parts is preferably such that the interruption of
the restoring circuit for relay AIHVR due to the
voltage contact. The .coded current >supplied to
2,405,869l
» Although I have herein shown _and described
only two forms of signaling systems embodying
my invention, »it is understood that various
impulseduring each “on” period of the code,
means for constantly energizing the other wind
in_g ofjsaid checking relay, the parts being so pro
changes and modiñcations may be made th'erein
within the scope of the appended claims without, 5 portioned thatsaid checking relay will close a
ñrstgpolar contact during each “on” period'of
departing from the spirit and scope of my inven-.
the‘code if and only if saidhigh voltage impulse
isV present and a second polar contact at` all other
Having thus described my invention, what I
times,- a second repeater relay, an energizing cir
cuit‘ for saidsecond repeater relay including a
1. In combination, a section of railway track,
tion;
claim
,
is:
"
’
>
v
Y*
-
-
.
'
'
»
,
means for supplying coded signaling energy con
source of current and said first polar contact,
sisting of alternate “on” and “oli” periods tothe
an energizingv circuit for said first repeater-relay
rails of said section, a track relay connected'
across the rails of said section and responsive toA
said coded energy, means for supplying> to the
rails of said section during each “on” period of
the code a high voltage impulse of less duration
including a source 'of current, said second polar
contact and a front contact 'of said second re
peater relay, and means for rendering said re
peater relays sufficiently slow acting to maintain
' their ` armatures
in‘ their
attracted
positions
whenever said checking relay is operating in re
th'an the “on” period to increase the shunting
sponse to the coded energy flowing in its said
sensitivity of the track circuit formed by said
one winding.
track relay and the rails of said section, and
means for detecting the presence of said high 20 5. In combination, a section of railway track,
a coding relay having a ñrst contact which is al
voltage impulse comprising e, relay subjected to
ternately opened and closed when said relay is
the track circuit energy and operable from one
operating and a second contact which becomes
position to another if and only if said high volt
opened each time said first contact becomes
age impulse is present during each “on” period.
2. In combinatio-n, a section of railway track, 25 closed, an impulse transformer having a primary
and a secondary winding, a two winding polar
a coding relay having a i’irst Contact which is a1
stick checking relay; means comprising a source
ternately opened and closed when said relay is
of track circuit current connected across the rails
operating and a second contact which' becomes
of said section in series with said first contact of
opened each time said first contact becomes
closed, a source of track circuit current, an im 30 said coding relay, the secondary winding of said
impulse transformer, the one winding of said
pulse transformer having its secondary winding
two Winding checking relay, and a front contact
connected across the rails of said section in series
of a ñrst repeater relay for supplying coded sig
with said source and said ñrst Contact of said
coding relay, a circuit for the primary winding of
naling energy consisting of alternate “on” and
3. In combination, a section of railway track,
said secondary winding a high voltage impulse
said impulse transformer including a source of 35 “oir” periods to the rails of said section, a track
relay connected across the rails of said section
current and said second Contact, and a track re
and responsive to said coded signaling energy,
lay connected across the rails of said section and
means including a source of current and said
responsive to the current supplied to ‘the rails
from said source of track circuit current over 40 second contact of said coding relay for energiz
said iirst contact.
ing said primary winding to thereby induce in
means for supplying to the rails of said section
during each “on” period of the code, means for
coded signaling energy consisting of alternate
constantly energizing the other winding of said
checking relay, the parts being so proportioned
having a high voltage impulse superimposed
thereon, a checking relay subjected to said coded
that said checking relay will close a lirst polar
contact during each “on” period of the code if
and only if said high volta-ge impulse is present
Non!)
“DE” periods, each said “on” period »
energy and operable in step with the code if and
only if said high voltage impulse is present, and
means controlled by said checking relay for in
terrupting the supply of coded energy to the
rails of said section if said high voltage impulse
is absent from the code.
4. In combination, a section of railway track,
a coding relay having a first contact which is
alternately opened and closed when said relay is
and a second polar contact at all other times, a
second repeater relay, an‘energizing circuit'for
said second repeater relay including a source of
current and said íirst polar contact, an energiz
ing circuit for said first repeater relay including
a source of current, said second polar contact
and a front contact of said second repeater re
lay, means for rendering said repeater relays
sufñciently slow acting to maintain their arma
tures in their attracted positions whenever said
opened each time said ñrst contact becomes
checking relay is operating in response to the
closed, an impulse transformer having a primary
coded energy flowing in its said one winding, and
and a secondary winding, a two winding polar'
stick checkingrelay; means comprising a source GO a restoring circuit for said checking relay in
operating and a second contact which becomes
of track circuit current connected across the rails f
cluding'said ñrst Contact of said coding relay,
of said section in series with said ñrst contact
of said coding rela , the secondary winding of
said source of track circuit current, the secondary
winding of said impulse transformer, and a back `
contact of said ñrst repeater relay.
said impulse transformer, the one winding of
6. In combination, a section of railway track,
said two winding checking relay, and a front 65
a ñrst relay having a pair of contacts which
are alternately opened and closed when said relay
is operating, an impulse transformer having a
“on” and “oli” periods to the rails of said sec
tion, a track relay connected across the rails of 70 primary and a secondary winding, a source vof
track circuit current connected across the rails
said section and responsive to said coded signal
of said section in series with one of the contacts
ing energy, means including a source of current
of said first relay and the secondary winding of
and said second contact of said coding relay for
said transformer for supplying to the rails of
energizing said primary winding to thereby in
contact of a ñrst repeater relay for supplying
coded signaling energy consisting of alternate
duce in said secondary winding a high voltage 75 said section coded signaling energy consisting of
alternate “on” and “oil” periods, a track relay
2,405,866
connected across `the rails of said section and
responsive to said 'coded current, a repeater re
lay provided with a contact and energized over
means for supplying coded signaling energy con:
sisting of alternate “on” and “off" periods to
the rails of said section, a trackV relay connected
across the rails of said section and responsive
the other contact of said ñrst relay in such man
to said coded energy, a two Winding auxiliary
ner that said repeater relay will open its contact QL relay having one winding connected across the
at the expiration of a short interval of time after
rails of said section and the other Winding con
said one Contact of said first relay becomes closed,
nected with a source of current over its own
and means controlled by the contact of said re
front contact and a front contact of said track
peater relay for energizing said primary Winding
of saidV transformer to thereby'induce in said
secondarywinding during each “on” period of
the code a high voltage impulse which increases
the shunting sensitivity rof the track circuit
formed by the rails of said section and said track
15
relay.
7. In combination, a section of railway track,
relay, vthe parts being so proportioned that said
auxiliary relay will operate itsA contacts in step
with the code if and only if said high voltage
impulse is present during each “on” period of
the code, and signaling means controlled by said
auxiliary relay.
s
`
HOWARD A. THOMPSON.
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