US1597810A - Train-control receiving apparatus - Google Patents

Description

` Aug. 31, 1926.

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SAMUEL IJI. .T iUGlr, OF ITTSB'URGH, PENNSYLVANIA, ASSIGN-OR T0 THE UNION SWITCH & SIGNAL COMPANY, 0F S'WISSVALE, PENNSYLVANIA, A CORPORATION O1? PENNSYLVANIA.

TRAIN-CONTROL RECEIVING APPARATUS. 4

Application filed July 6, 1925. Serial No. 41,559.

My invention relates to receiving apparatus, and particularly to apparatus suitable for use inV connection with train control systems wherein train carried mechanism is controlled atleast in part by an alternating current which flows through the track rails. p p

One feature of my invention is the provision of a receiver which would supply energy to the train carried mechanism in accordance withV the train controlling current in the trackway, but which will not supply energy to such apparatus in accordance with alternating currents flowing in adjacent conductors such as transmission lines or train propulsion motor windings.

I will describe one form of receiving apparatus embodying my invention7 and will then point out the novel features thereof in claims.

The accompanying drawing is a view7 partly diagrammatic and partly in perspective, illustrating one form of receiving` apparatus embodying my invention.

Referring to this drawing, the reference characters 1 and 1n designate the track rails of a stretch of railway track. Means are provided for at times supplying a train con trolling current to these track rails. In the form here shown this train controlling current flows through the two rails in parallel. Two impedances designated by the refer.- ence characters 2 and 2a are connected across the track rails at spaced points in the trackway7 and the train controlling current is supplied to the mid-points of these i1npedances. The immediate source of the train controlling current is an alternator A, one terminal of which is connected directly with impedance 27 and the other terminal of which is connected with the impedance 2 through a circuit controller 3. This circuit controller may be operated by any suitable means forming no part of my present invention, and omitted from the drawing for the sake of simplicity. In actual practice the circuit controller 3 will usually be controlled 4in accordance with traflic conditions in advance.

A train, indicated diagrammatically at V, is provided with receiving apparatus comprising a magnetizable core 10 located in inductive relation with the track rails. This core is provided with two downwardly projecting feet 102L located on opposite sides of the track rail 1. Two similar feet 10b depend from the core 110 on opposite sides of the track rail 1a. The core 10 is provided with a windinglil intermediately the two feet 10, and asimilarwindingl is placed on core 10 intermediate the two feet 10b. The train controlling current `iowing'inV each rail 1 and 1L creates a magnetic flux which surrounds the rails. A portion of the flux around rail 1 followsthe path 11 through feet 10a and core A10and so links onewind'- ing 14. A portion of ,the flux around rail 1a follows the path 12 through feet 10b and core 10 and so links the other winding 15. A portion of the flux which surrounds both rails passes through core 10 along the path 13 and so links both windings 14: and 15. The windings 14 and 15 are so connected in series that the voltages induced in these windings by the fluxes due to the train controlling current flowing through the rails 1 and 1a in multiple are additive. The terminals of the windings 111 and 15 are connected with a relay R which may be used to control governing mechanism (not shown in the drawing) in any suitable manner.

Under some conditions of operation, foreign fluxes may be present in the vicinity of the core 10. For example, a transmission line 7 extending along the trackway may cause a flux in the path 9. Similarly a motor M such as a propulsion motor on the train V may cause a flux in the path 6. In the absence of any preventative means these fluxes may pass through the core 10 andy create voltages in the windings 111 and 15 and may therefore cause improper operation of the relay R. This is undesirable, and to prevent its occurrence I provide a shield Si surrounding the core 10. This shield is constructed of electro-conducting material such as copper or aluminum. In the form here shown this shield comprises a box having a top 16, two ends 17, and two sides 18. The bottom of this box is open. It is manifest that the shield S has no effect upon the fluxes due to train controlling current in the track rails because these fluxes pass through the open bottom of the shield S.

Foreign fluxes from the transmission line 7 or from the motor M must however pass through the shield S. These fluxes create eddy currents in the walls of the shield, which eddy currents react to oppose the passage of suoli foreign fluxes through the shield. As a result the amount of such foreign fluxes which pass through core 10 is greatly reduced and the effect of such` fluxes upon windings 14 and 15 is substantially negligible; f Y

I have herein illustrated my invention as applied to receiving apparatus for use` in' connection With a train controlling current which flows through the tivo rails in paral lel, but this particular method of supplying current to the'rails is not essential to my invention. f

It should be particularly pointed out that the shield S'prevents the passage of iluxes through core lO except from a limited region, that is, from the'tracl rails,` and consequently the` shield will prevent the paslsage of foreign fluxes through this core no matter What may be the source of such fluxes.

`Although I" have herein shown and de- Y scribed only onek form of receiving apparatus embodying my invention, it is understood that various changes and modifications may be made therein Within the scope of the appended 'claims Without departing from the spirit and scope of my invention. Having thus described my invention, What Iclaim'isl. A train carried receiver comprising a magnetizable core located in inductive relation with a track rail, a Winding on said core, and means associated with said core for permitting the passage of magnetic flux through said core from ak predetermined region only.

2. A train carried receivercomprising a magnetizable core in inductive relation with both track rails, a Winding on said core, and a shield of electro-conducting material surrounding said core but having an opening between said core and theV track rails.

In testimony whereof I ailix my signature.

SAMUEL M. LUCAS.

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