US1771215A - Railway-traffic-controlling apparatus - Google Patents

Description

July 22, 1930. R. M. GlLs'oN 1,771,215

RAILWAY TRAFFIC CQNTROLLING APPARATUS Filed Oct'. 9, 1929 Patented July 22, 1930 UNrrEDsrArEs PATENT- OFFICE ROBERT M. GILSON, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO `'Ili-IE UNION SWITCH & SIGNAL COMPANY, OIE".l SWISSVALE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA RAILWAY-TRAFFIC-CONTROLLING APPARATUS Application filed october 9, 1929. Serin No. 398,309.

My invention relates to railway trafc controlling apparatus, and particularly to ape paratus of the type involving train-carried rgoverning mechanism controlled by energy.

received rom the trackway. MoreA particularly my present invention relates to the trackway portionof such apparatus, and is especially suitable for train control systems 'if the coded continuous inductive type.

One feature of my invention is the provision of novel and improved'means for cony trolling the application of coded train governing current tothe track. rails in `advance of a train.

I will describe one form of apparatus embodying" my invention, and'will then point out the novell features thereof in claims.

The accompanying drawing is a diagrammatic view showing one form of apparatus 2o embodying my invention.

Referring to the drawing, the reference characters l and la designate thel track rails of a stretch oi railway track along which traffic normally movesin the direction indicated by the arrow. These rails are divided by insulated jointsv 2 to form a plurality of sections, of which only one complete section AB, is shown in the drawing. Each section is provided with a track circuit comso prising a track relay designated by the reference character T with an exponent corresponding tc the location. The source of track circuit current for each section is a transformer 9, the secondary of which is connected across the track Vrails and the primary of.

which is supplied `with currentin the manner hereinafter explained.

Each track section is also provided with a l line relay L, a. line repeating relay LR, and a code rela-yV. 'Each linev repeating relay LR is controlled by a front contact 8 of the asseciated'line relay L, so that the repeating relay is energized or deenergized according as the Y line relay is energized or de-energized.v The circuit for the repeating relay. LR will be obvious from the drawing WithouteXplanaf tion.

Line relay L at locationA isprovided with a circuit which passes from one terminal of VaA battery B12, through front contact 5 of repeating relay LR, front contact?) of track .relay TR, winding of relay L, front Contact 10 of track relay TA, winding or' relay V, front Contact 4 orF track irelayTB, and front Contact 6 of relay LR to the other terminal'of battery B12. The contacts 5 and @of the repeater relay LR constitute. a pole-changer, whereby the polarity of the current supplied to relay L is normal or reverse according` as relayV LR is energized or cle-energized, .The parts of this circuit are so proportioned and adj usted that when the circuit is .closed relay L will be energizedbut the code relay V will Vbe cle-energized, that is, the back point of its Contact 7 willbe closed. Track circuit current will then be supplied to the primary'of transformer 9 from terminals X and Y, which terininalsxare connected `with a suitable source 'of alternating trackcircuit current. a j

When a train entersv section A-fB, it will, oi' course, de-energize track relay TA, so that the front pointA of contact l0 of thisrelaywill open and the back point of the same cont-act will close. This will cut the line relay L out of the circuit, and will close a shuntacross the circuit, which shunt includes a battery BG. This battery will then assistl oroppose Y battery B12 according as linerepeater relay LR is closed or open, .but in either-event, the code relay V `Will-becomey closed. If the two lbatteries oppose each other,relayVv` will close because of the reduced resistanceof the lcircuit due to the exclusion 01' the line relay L. The desired result Vmay conveniently be ac coinplished by making battery B12 a `12-volt battery, and making battery Baa G-vclt-battery. lVhen relay V becomes closed, the

source ot trackcircuit current 'will be disconnected from the primary of transformer-9, ,y

and train governing currentA willbe applied to l.this primary by asuitable means which forms no pa'rttofV InyA present?.invention. vThe apparatus controlledby theccde relayVmay, for example, be similar to the apparatus shown in. my rcofpen'dingf application, Serial No.171,767, iiledMarchLlQQ'Z,:fori ailway l trailic ,controlling apparatus.

Thecircuit for ytine line relay L. and .the code relay Vis'provided with a second shunt,

which includes the back point of contact 4 or" track TB. It follows that When the section to the right of point B is occupied, so that track relay TB is cle-energized, line relay L will be fle-energized, but code relay V Will become energized it a second train enters section A-B, because battery BG will then be connected directly with the code relay V. To put the matter in another Way, when a train enters section iti-B, thereby closing the first shunt for the line relay circuit, code relay V will become energized regardless ot Whether track relay TB vis energized or deenergized.

The line relays L and the line repeater relays LR will ordinarily control Wayside sig'- nals and also the train governing current, but these features torni noy part ot my present invention, and, consequently, they are omitted from the drawing for the purpose ot simplicity.

Although I have herein shown and described only one form of apparatus embodying my invention, it is understood that various changes and modilications may be made tlierein Within the scope ot the appended claims Without departing from the spirit and scope oiE my invention.

Having thus described my invention, what I claim is:

l. In combination, a stretch ot railway track divided into sections; a track relay, a line relay, and a code relay tor each section; a circuit for the line relay of one section including a front contact of the associated track relay and a front contact of the track relay for the next section in advance as Well as the Winding of the code relay for the associated section, a source ot current ot relatively high voltage, means for supplying current of normal or reverse polarity from said source to said circuit according as the line relay tor the said section in advance is energized or deenergized, ashunt around said line relay and said front contact of the first track relay which shunt includes a back contact of said first track'relay and a source ot current of relatively low voltage, and a shunt around said first source of current and the pole-chang 'ingl contacts and the front contact ot the second track relay which shunt includes a back contact ot said second track relay, the parte being so proportioned and adjusted that said cede relay is normally open but is closed when said rst shunt is closed Whether said second shunt is closed or open.

2( In combination, a stretch of railway track divided into sections; a track relay, a

line relay, and a code relay for each section; y

a circuit for the line relay of one section including a front Contact ot' the associated track relay and a front contactof the track relay for the next section in advance as Well as the Winding of the code relay tor the assoeiated section, means for supplying current of normal or reverse polarity at relatively high voltage to said circuit according as the line relay tor the said section in advance is energized or de-energized, means operating when said first track relay is open to close a shunt across said circuit including a source of currenty ot relatively low voltage, and means operating when said second track relay is open to close a second shunt across said circuit, the parts being so proportioned and adjusted that said code relay is normally open but is closed when said first shunt is closed Whether said second shunt is closed or open.

3. In combination, a stretch ot railway track divided into sections, a track relay and a line relay as Well as a code relay for each section, a circuit for the line relay for one section controlled by the track relay tor the same section and the track relay for the next section in advance and including the asso-- ciated code relay and a source of current, means operating When said irst track relay is open to close a shunt across said circuit includilrgr a second source of current, and means operating When said second track relay is open to close a second shunt across said circuit, the parts being` so proportioned and adjusted that said code relay is normally open but is closed when said first shunt is closed Whether said second shunt is closed or open.

In testimony whereof I aiiix my signature.

ROBERT M. GILSON.

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