US1630559A - Train-carried receiver for automatic train-control systems - Google Patents

Description

1,630,559 May 1927' c. H. ZIERDT TRAIN GARRIED RECEIVER FOR AUTOMATIC TRAIN CONTROL SYSTEMS Filed Oct. 5. 1925 a?) 16 '1 Z? Mk. 1 1 /L 4 7. .4

INVENTOR G15 MATTORNEY i atonted i l lay 2751, 1927a unites STATES PATENT orr cr...

GQIQ'RAD Ii. ZEERDT, OF ROSEDALE, PENN TOl/VNSHIP, ALLEGHENY GO'UIQ'TY, PENN E'JYLVANIA, ASSIGNOR TO THE UNION SEVITCI'I AND SIGNAL COMPANY, OF I'SViTISS VALE, BENNEEYLVANIA, A CORPORATION OF PENNSYLVANIA.

TRAIN-CARRIED RECEIVER AUTOMATIC TRAIN-CONTROL SYSTEMS.

Application filed October 5, 1925.

. My invention relates to autoniatic train control systems of the type wherein train carried apparatus is controlled at least in part by an alternating current which flows tl'u'ough the two track rails in nultiple.

More specifically, my present invention relates to a train carried receiver for use in systems of this character. 1

ilne object of my invention, isthe provision of a receiver which will supply energy to the train carried apparatus in accordance with the train controlling current in the track rails, but which will not supply energy to such apparatus in accordance with alternating cin'rents fiowingin adjacent transmission lines or in adjacent tracks, etc.

if. will describe one form of receiver embodying my invention, and will then point out the novel features thereof in claims.

In the accompanying drawing, Fig. 1 is a diagrammatic view showing a portion of an automatic train control system including one form of receiverembodying my invention. Fig. 2 is a front view of the. receiver A shown in Fi 1. j j

Slimilar rererence characters refer tosimilar parts in each of the views.

Referring lirst to F 1, the reference characters 1 and 1 designate the trackrails of a railway, which rails are divided by insulated joints to form a track section. .OOIb nected ac ross the rails of this, section at spaced jfioints arc two'resistancesfi and 8, and connected with the middlepoints of these two'resistanccsrespectively are the two terminals of the secondary 4t of a transf rm-er 'l. The primary 5 of this transformer supplied. with alternating train controlling current'from a suitable source not shown in. the drawing. It is understood that in practice the supply of current to the track rails by transformer T will usually be controlled in accordance with traffic conditions, but inasmuch as the controlling means forms no part of the present invention it is omitted from the drawing. It will be 'apparent that the current supplied by transformer 'l flows throughthe two track rails 1 and 1 in multiple, that is, at any given instant it flows in the same direction in these rails.

The reference character W designates a railway train provided with a receiver A broken lines 17 and 17 in Fig. 2.

Serial No. 60,504.

embodying my invention. Referring to Fig. 2, t lns receiver A comprises a bar 8 of mag netizable material extending transversely across the two track rails 1 and l which bar is provided with four downwardly pro ect ng legs 9, 1 0, 11 and 12. These legs are so disposed that the legs 9 and '10 are on oppos te sides of one track rail 1, whereas the legs 11 and 12 are on opposite sides of the other track rail 1. The two inner legs 10 and 11 are provided respectively with feet 10 and 11 which extend parallel with the track rails, as shown more clearly in Fig. 1.

The four legs 9, 10, 11 and 12 carry a winding which is made up of four coils 13, 14, 15 and 16, located upon the four legs respectively. This winding is included in a pickup circuit B, the four coils being connected in series in this circuit in such manner that the polarities of the coils on each two adjacent legs are opposite. The pick-up circuit also includes a condenser 7 which will usually be adjusted to balance the inductive impedance of the circuit B, so that this circuit is tuned to resonance at the frequency of the current furnished by transformer T.

The pick-up circuit B may be used in connection with tain carried governing apparatus of any suitable type' As here shown, this circuit supplies energy to one winding 4; of an induction motor relay R, theother winding o of which is supplied with energy by any suitable means having nothing to do with the present invention. 1 An amplifier is prefe ably interposed between the receiving circuit 13 and the winding at. As here shown, the amplifier is connected across the termi- 9o nals of the condenser 7. i U The magnetic fluxes surrounding rails 1" and 1 due to the current from transformer '1 in those rails, may be represented by the The l 17 surrounding rail 1 will pass through coils 15 and 16 in such directions as to create electrom-otive forces in the circuit B which are additive. Similarly, the flux 17 surrounding rail 1 will flow through coils 13 and 14: in such directions as to create electroinotive forces in the circuit B which are additive. Furthermore, the electroinotive forces thus created in coils 15 and 16 by the one flux and in coils 13 and 1st by the other flux are additive. An electromotive force is therefore created across the terminals of condenser T due to current supplied to the track .rails by the tiransforn'ier T.

The two rails will also be surrounded by a mi-ic'netie flux which may he represented by the hroken line 18. This flux will flow through the coils 13 and 16' in such directions as to create electromotive forces in these coils which are additiveto each other, and which are also additive to the electrolnotive forces created by the flurtes 17 and 1.7 surrounding the individual rails.

A horizontal foreign magnetic flu); will pass partly along the bar 8 and so will create no electroniotive force in. the winding of receiver A. A part of such flux will enter at the leg 9, and will leave at legs 10, 11 and 12 whileanother part will. enter at log. If) am will leave atlegs 11 and 12. i A very small part may enter atleg 11 and leave at 12. By proper. balancing of the turns in the several coils and ofthe sizes of the feet 10 and 11, the parts of a horizontal flux which actually pass through the coils may he made to substantially neutralize each. other and so to create no substantial electromotive force in circuit B.

A vertical foreign flux will pass though all four legs of the core in the same direction, and by properly selecting the number of turns-inthe coils and the size of the feet, the resulting electromotive forces created in the pick-up circuit B can be made nearly equal and opposite.

It follows from the foregoing, that any foreign magnetic flux due to alternating current ina t'ansmissi'on line or an adjacent track.- Will create little or no electromotive force inthe pick-up circuit B and so will have little or no tendency to cause false operation of the train governing relay R.

In train control system of the type to which this invention relates, the receiver A is usually located between the engine and tender of a steam train, and between the first and second cars of an electric train. I have found that in some instances a portion of the current from transformer T will leave the rails at the forward end of the train,

pass through the steel structure and couplers of the train and return to the ails from the rear end of the train. Inasmuch as the re ceiver A. is usually located under a coupler, it follows that this current which passes through the train itself. and which is us 3 termed the cou'plei current will pas above the receiver A. lVhenthc receiver is constructed in accordance with my inventiomthemagnetic thin surrounding the coupler will pass through the middle legs 14 and of the receiver core 8, and so will create voltages in the coils Li and 15 which assistthe voltages induced in the circuit B by the current which remains in the track rails.

Although I have herein shown and. described only one form of receiver embodying my invention, it is understood that various changes and modifications may be made therein within the scope of the appended claims without departing :t'ron'i the spirit and scope of my invention. Having thus described my invention, what I claim is: a

1. A train-carried receiver comprising a bar extending. t 'ansversely across the track rails and having four downwardly projecting legs two of which are on opposite sides of one track rail and the other two of which are on opposite sides of the other track rail, and a winding made up of a coil on each lcg said coils being connected in series in such manner that the electromotive forces induced therein by an alternating current flowing through the two track rails in multiple are additive.

2. A train-carried receiver comprising a bar extending transversely across the track rails and having fonr downwardly project ing legs, two of which are on opposite sides o-fone rail and the other two of which are on opposite sides of the other rail, the two inner legs having feet extendingparallel to thetrack rails, anda winding made npof a coil on each leg, said coils being connected in series in such manner that the electrometive forces induced therein by alternating current in the track rails are additive.

In testimony whereof I afiix my signature.

CONRAD H. ZIERDT.

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