US901250A - Cab signal system. - Google Patents

Description

D. J. McGARTHY. GAB SIGNAL SYSTEM.

APPLIOATIOK IILED [A119, 1908.

Patented Oct. 13,1908.

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Patented Oct. 13, 1908.

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EPMJIQ, M (M11154 1). J. McGARTHY.

GAB SIGNAL SYSTEM.

APPLICATION FILED HAY 19, 1908.

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UNITED STATES PATENT OFFICE.

DANIEL J. MCCARTHY, OF WILKI NSBURG, PENNSYLVANIA, ASSIGNOR TO THE UNION SWITCH & SIGNAL COMPANY, OF SWISSVALE, PENNSYLVANIA, A CORPORATION OF PENNSYL- I VANIA. I

CAB SIGNAL SYSTEM.

Specification of Letters Patent. Patented Oct. 13, 1908.

Application filed Kay 19, 1008. Serial No. 483,645.

To all whomdtmay concern:

Be it known that I, DANIEL J. MCCARTHY, of VVilkinsburg, Allegheny county, Pennsylvania, have invented a new and. useful Cab Signal System, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in

which Figure- 1 is a diagram illustrating one form of my invention; Fig. 2 is a similar view but with one of the trains or vehicles in a different position; and Fig. 3 is adiagram showing a modification. a

My invention relates to a. system of railway signaling in which the signals are placed upon the train and commonly known in the 1 is located. That isto say, it will indicate skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

deferring first to Figs. 1 and 2, the letters A, B, C and 'D designate successive block sectlons'of a railway track. R, R designate the track rails of the block section B, and

R R designate the. track rails of the block section C. Sis a semaphore or other track signal which guards the entrance to the block A; S is the signal which guards the entrance to the block B, and S is the signal which uards the entrance to the block C. These signals may be operated by any of the well known systems.

1 and 2 are signal mains in which flows an alternating current supplied by a generator G. The frequency of this current can be of any value when the propulsion power for the cars or trainsis other than an alternat-ing current, When the propulsion power is alternating current, the frequency of the generator G is preferably of a value which is ifferent from that of the ropulsion current.

T is a transformer block B, and T is a transformer for su plying the block C. Each of these trans ormers has one primaryand two secondary coils or windings. The secondary coils of the transformerT are desi ated 14 and 15 and the secondary coils o the transformer T are designated 16 and 17. The primary coil of each transformer is connected across the signal mains 1 and 2. The secondary coil 14 of the transformer T is connected by one terminal to the middle point of the impedance coils 3 through a circuit breaker 4: which is cont-rolled by the movement of the signal S. The other terminal of the coil or or supplying the I wmding 14 is connected to the middle point of the. impedance coils 5 at the opposite ends of the block B by a conductor 7. The impedance coils 3 and fimay be the well known induction bonds which are used in block Signaling 11 el roads and which form a path for the propulsion current from one block section to another, but which serve to hold back the alternating signal current. The secondary coil 16 of the transformer T is in like manner connected by one terminal with the inductance bond 5 through a circuit breaker 6 controlled by the signal S and by its other terminal with the middle point of the bond at the opposite end of the block section C. The other secondary COllS 15 and 17 are respectively connected across the track rails R, R and R R of the blocks B and C.

10 is a conventionalrepresentation of a train, car or vehicle which in Fig. 1 is shown within the block section B, and 24.- is a similar representation of another train, car or vehicle which in Fig; 1 is shown as occupying the block section C. Each car, locomotive or other vehicle has thereon an inductor v whlch is shown as consistlng of two 00118 or windings which are laced in inductive rela- 3 vehicle 10 and the corresponding signal is v indicated at 11. The similar coils or windings on the-car or vehicle 24 are designated as 19 or '20 and the corresponding cab slgnal is indicated at 21. Each car or vehicle also carries another inductor which is shown as 7 consisting of two coils in inductive relation to the track rails and including a signal or indicating device in either circuit. These two coils on the car or vehicle 10 are indicated by the numerals 12 and 13 and the corresponding signal is indicated at 18.

The corresponding coils or windings on the car or vehicle 24 are designated as 22 and 23 and the cab signal operated thereby is indicated at 25. These cab signals may be either visual or audible signals, or both, and their operative mechanism is electro-responsive to the current generated in their circuits by the inductors.

The secondary coil 14 or 16 causes a current to flow through the track rails of the corresponding block and through the wire or conductor 7 when the signal S or S' is in clear position so that the corresponding signal-controlled circuit breaker 4 or 6 is in closed position. The coils of those inductors which operate the cab signals 11 and 21 are so connected that the current induced in them by currents from these secondary coils 14 and 16 will flow through the inductors 11 and 21 and will cause them to indicate a condition corresponding to the position of the signals S, S. Thus in Fig. 1, the signal S is in its clear position and a current is therefore flowing in the track rails from the secondary winding 14. The current induced in the coils 8 and 9 will therefore cause the cab signal 11 to indicate a clear position as shown. The signal S, however, is at danger position and therefore no current is flowing into the rails R'-, R from the secondary wet the transformer T. The cab signal 21 indicates a corresponding danger position. I

The signals indicated at 18 and 25 are operated by a current flowing in the track rails from the secondaries 15 and 17. In the 7 position of the train or vehicle 10 as shown tive 10 and the signal S the indicator 18 will indicate a clear position. In the same way the indicator 25 will show a clear condition of the track so long as there is no train or other vehicle between the train or vehicle 24 and the signal S. Suppose, however, that the train or vehicle 24'has moved into the block B beyond the danger signal S as shown in Fi 2. The signal S being clear, current will e flowing along the rails R, R and as there is no difference of potential between the rails for this current the locomothem through the axles of the locomotive 10 so that the signal 25 will indicate that there is another car or train in advance in the same block.

In block signaling systems, the signals are usually so constructed and arranged that any derangement of the controlling circuits will cause the'signals to indicate danger. 'To prevent delays of trafiic from such causes. it is customary for the train that has been stopped by a danger signal to wait acertain length of time and if the signal does not change within this time, to proceed under caution to the next si a1. By the system here described, the indlcators 18 and 25 will in allsuch cases indicate the presence of any other train or vehicle in advance in the same block. I Supposing'the signal S to have failed in the danger position and the locomotive or other vehicle 10 to have" passed out of the blocks A and'B so that the signal S is at clear position. the locomotive-24 in passing intothe block B will have" its indicators 25 and 21 show clear, thereby indicatingthat no other train or car is in that block and that the signal S is clear. Therefore the locomo-- tive 24 need not proceed under caution. thus saving time and also giving a positive indication that the signal S is out of order.

Fig. 3 shows another form of the invention in which the inductors 26 and 27 which operate the cab signals or indicators 18 and 2:") are placed parallel with and in such relation to the axles of the locomotive that when an alternating current flows through the axles, an electro-mot-ive force will be induced in these conductors, thereby causing a current to flow through the indicators 18 and 25. The line wire 2 is connected to the rails R, R of the blocks B and C through the cir cuitbreakers 28 and 29 controlledv by the track signals S, S. The line wire 1 is connected directly to rails R, R- at opposite ends of the blocks B and C. Signal S being in the clear position, a current is flowing from the line Wire 2* through the rail R, through the axles of the locomotive orothervehicle 10 and through rail R back to the linewire 1", As stated above this causes a current to flow through the indicator 18 'which will indicate a clear positlon corresponding to the signal S. The signal being in the danger position and circuit breaker29 bein open no current will be flowing through rails R R fromthe line wires 1 and 2 so that the indicator on the locomotive or othervehicle 24 willnot utilized to operate t 1e cab signals indicatin the condition of the track and of the trac signals in the mannerdescribed. 1

1. In a cab signaling system, sectional track rails, track signals, means for sueppllying current to the track rails control'l the movement of the track signals, an in- "dnctor carried by the vehicle and arranged to have a circuit'inducedtherein by current flowing in the track circuit and a signal de} vice on the vehicle which is responsive to current' generated by the inductor; substantially as described.

'2. In a cab signaling system, sectional track rails, track signals, means for sup lying current to the track rails controlle bythe movement'- of the track signals, an indnctor carriedby-the vehicle and arranged the movement of thetrack si in inductive relation to an axle" thereof, and a signal device. on the vehicle responsive to current generated by the inductor; substantially, as described.

In a cab signalin system, an indicator in the cab or other-vehicle for indicating the condition of -an advance track signal, a secthe track of that blockirrespective of the position of the track si als, track circuits.

and means carried by t e vehicle'and operated from the track circuitsfor operatinv.

said indicators; substantially'as describe "4. In a cab signaling system, sectional track rails, track signals, means for sup 'ly-' ing current to the track rails controllefby v als,-an indicator on the'cab or other vehicle arranged to'be operated by the current controlled by the movement of thetrack signals, asecond indicator on-the cab or other vehicle and a second track circuit for o crating the-last named indicator; 'substantlally asdescribed. 5.111 a cab signaling system, sectional track rails, transformers for su plying currents to thetrack. rails, each 0 said trans-v formers having two secondary coils "or windconnected to the track rails, track si i m n'aIi, circuit breakers controlled by thetrac signals for controlling the supply of current vstantia y as-described. cud-indicator for indicating the condition of;

from one of the transformer secondaries, in

dicatin means-on thecab or other vehicle and in uctors carried by'the jehicle and arranged to have current induced in them v, by currents flowing in the track-circuits for operating the indicator; substantially as described. r i 6. Inv a cab signaling system, sectional track rails, transformers for supplying cu'rsaid trans rents to 't-hetrack rails, each 0 formers having two secondary 'windin r cons nected to the track rails, track signa is, cir j cuit breakers con-trolled'by the track'sl =for controlling'the supply. from one o the als transformer secondaries to the track rails,

two different indicators carried by the cab or other vehicle, and an inductor for operat-= ing each of said indicators, each of said ln -i ductors arranged to-have a current induced therein by the current flowing from one of the transformer secondaries; substantially as described.

7 In a cab signaling system, the combina I I tion withsectional track rails and inductive.

bonds connecting'the different blocksor sec- I I tions, of transformers having secondary coils whose opposite terminals are connected to the inductive bonds at opposite ends of 1 the corresponding blocks or. sections, cab signals or indicators and inductors carried by the cab or other vehicle "and arranged to be operated by the current suppliedb 1 said secondaries, together withtrack signa s and circuit breakers operated thereb 'for controllin the circuits of said secon arie's; sub-- 6 8; In a 'cab. signaling system, the combina:

tion with sectional track rails, of transformem for supplying current to said rails, each of said transformers having two' secondary 'coilsor windings, one of the secondary coils or windings of each transformer beingco'nhected' directly across the track rails,; and thev other 'oisaid coils or windings of each transformer being connected by its opposite. terminals with both track'rails at opposite ends of the corresponding block or section,

together with si aling or indicating mechanlsm on the ca s or other vehicles responsive respectively to currents flowing in-said rails from thetwo coils or windin of the transformer; substantiall as descri d. In testimony whereof, my hand.

- DANIEL ,J'. McCARTHY..

Witnesses:

' A, L- VENQILL',

. R. L..KISTLE R.

have'hereunto set

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