US1895013A - Railway signaling - Google Patents

Description

Jan. 24, 1933. P. P. STOKE R RAILWAY SIGNALING Original Filed Feb.'l8, 1930 2 Sheets-Sheet 1 INVENTOR:

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Ova-F dust Jan. 24, 1933.

P. P. STOKER RAILWAY S IGNALING L-x'mlzz Uriginal Filed Feb. 18, 1930 2 Sheets-Sheet 2 INVENTOR P P, S t o er" m Patented Jan. 24, 1933 UNITED STATES ENT PAUL I. STOKER, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO THE UNION SWITCH & SIGNALv COMPANY, OF SWISSVALE, PENNSYLVANIA, A GORPORATION OF PENNSYLVANIA Application filed February 18, 1930, Serial My invention relates to railway signaling, and particularly to signaling for stretches of single track over which traflic moves in both directions. One feature of my invention is the provision, in signaling of this kind, of means controlled from a remote point for permitting several cars or trains to pass through a stretch in the same direction, while preventing two cars or trains moving in opposite directions from occupying the stretch at the same time.

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

In the accompanying drawings, Figs. 1 and 1*, when placed end to end with Fig. 1 on the left, constitute a diagrammatic view showing one form of signaling apparatus embodying my invention.

Referring to the drawings, the reference character N'designates a stretch of railway track between points X and Y, which track is divided by insulated joints to form a plurality of track sections X1, 12, 7,-Y, Located in the section X1 is a switch L leading into a passing siding P, and located in the section 7Y is another switch L leading into a passing siding Q.

Each track section is provided with the usual track circuit, comprising a track battery 8 and a track relay designated by the reference character T with a distinguishing exponent. I

Traflic entering the stretch X-Y from the left is governed by two signals S and 8 a, according as such traflic enters from the main track N or the siding P. Tratfic entering the stretch from the right is governed by two similar signals S and S a, according as such traffic is on the main track or the siding Q.

Located at the left-hand end of the stretch XY is a despatchers relay D which is controlled by a selector K and which selector is in turn controlled from a remote point,

' such as a despatchers oflice, over a despatchers line M. When the selector K receives the code to which; it responds, it will close a pick-up circuit for relay D which circuit passes from terminal B of a suitable source of current, through the selector K and the RAILWAY SIGNALING No. 429,283. Renewed January 18, 1932;

winding of relay D to terminal 0 of the same source of current. WVhen relay D becomes energized, a stick circuit for this relay will become energized, which circuit is from terminal B, through the selector K front contact 19 of relay D and the winding of relay D to terminal 0. Relay D will then remain energized until a code is transmitted over the line M to operate the selector K in such manner as to open the stick circuit for this relay.

- Associated with the switch L is a switch repeater relay G which is controlled by a pole-changer 31 operated by the switch L in such manner that the relay is energized in normal or reverse direction according as the switch is in its normal or reverse position, but that the relay is momentarily deenergized during the transit of the switch from either position to the other. The circuit for the relay C will be obvious from the drawings.

The apparatus for controlling the signals S and SM involves a directional relay A a home relay H two slow-releasing relays E and E a, and a stick relay G The right-hand end of the stretch X-Y is provided with apparatus similar to that just referred to for the lef -hand end, and the parts of this apparatus bear the same reference characters except that they are provided with the exponent 2 instead of the exponent 1.

The operation of the apparatus is as follows:

I will first assume that there is a train moving toward the right and approaching the stretch XY on the main track N, and that the despatcher desires to clear the signal S" to admit this train into the stretch. To do this, he will send the proper code over the transmission line M to operate the selector K in such manner as to energize the despatchers relay D Directional relay A will then become energized by virtue of a circuit which passes from terminal 13, through the back point of contact 9 of the despatchefs relay D at the right-hand end of the stretch, contacts 10 to 17, inclusive of track relays T to T inclusive, front point of contact 18 of relay D and the winding of relay A to terminal 0. Home relay H will then be- -26 ofrelay D winding of relay H and front point of contact 27 of relay H to terminal 0.

Assuming that switch L is in the normal position, signal relay E will then become energized, the circuit being from terminal B, through contact 28 of relay H neutral contact 29 of switch repeater relay C .polarcontact30 ofthis relay in the left-hand position', and the winding of relay E to terminal 0. Signal S will then be moved to the clear position by virtue of, a circuit which includes front contact 34 of relay E When the train-enters section X1, it will open track relay T and this will in turn open the circuits for directional relay A and home relay H The opening of home relay H will, of course, open the circuit for signal. relay E withthe result that signal S will return to its stop position. During the time interval between'the opening of track relay T andthe opening of signal relay E however, a pick-up circuit for stick relay G will become closed, which circuit is from terminal B, through back contact 32 of track relay T front contact 33'of relay E and the winding of relayG to terminal 0. Relay G is provided with twostick circuits, the first of which is from terminal B, through front contact 34 of despatcher relay D back 'contact35 of directional relay A front contact 37 of relay G and the winding of this relayto'tenninal' O. The other stick circuit for relay G is from terminal B, through back contact 36 of switch repeater relay C back contact 35 ofrelay A front contact 37 ofrelay G and the winding of relay G to terminal 0. It will be seen, therefore, that after relay'Gr' becomes energized,'it will remain-energized as long as the 'despatchers relayD remains closed, or if the despatchers relay D is opened, relay G will remain energized during transit of the switch L if this switch should be reversed. When relay G is energized, it closes a branch around contact 25 of relay A in the circuit for home relay H so that after the train moving toward. the-right'passes point' i, or such other point-as to permit relay H to become energized home relay H will again become energized thereby again energizing signal relay E with the result that signal S will return to the proceed position, thereby permitting a following train moving toward the right to enter the stretch If'thetrain moving toward the right is on the'siding P, the despatcher will, of course, reverse switch L to allow-this trainto pass 'intothe stretch ofsingle track, and this will reverse switch repeater relay C thereby causing'polar contact 30 of this relay to' swing to the right. This will result in ener- G controlled by contact 34 of the despatchefls relay D is, 'of course,.to permit following trains moving toward the rightto enter the .stre tch'-X;Y without requiring any action on the part of the despatcher. The purpose of the other stick circuit for relay G -is to per- Init switch L to be moved from the normalto the reverse position'or vice-versa after the apparatus has been set up to permit a train moving toward the right to enter the stretch If the despatcher desires to admit a-train mo-vingtoward the left into the section X-Y, he will transmit the code to which the selector responds, thereby causing relay D to-become energized. 'Directional relay A will then-become energized-by virtue of a circuit which passes from terminal B,'through the back point of contact 18 of the despatchers relay'D then throughithe front contacts of the'sevcral'track relays T to THi-nclusive, front point of contact 9 of relay D and the directional relay A? to'terminal'O. The operation'of the remaining parts of the apparatus associated with the right-hand end of the stretch willbe understood from the foregoing without detailed explanation. I

Although 'I have herein shown and describedonly one form of signaling apparatus embodying myinvention,- it is understood that various changesand modifications may be made thereinw-ithin the scope ofthe appended claims without departing from the spirit and scope of my invention. j

Having thus described my invention, what I claim is z 1. In combination, a stretch of 1 railway track along which tr'aflic moves in both directions, such stretch being divided into sec tions each of which is 'providedwith the usual track'circuit i'ncludinga track relay, a

normally deenergized despatchers relay,

means'controlledfrom a remote point for energizing saiddespatchers relay, a directional' relaycontrolled by a front contact of said despatchers-relay'and afront contact "of each of saidtrack relays, a home relay,'a circuit for said home relay including a front contact of said despatchers relay and a=front contact "of said directional relay'as well as a front contact of the track relayfor the first track section in'said 'stretch, a slow-releasing signal relay controlled bya front contact of said homerelay, a signal governing traflic into said strechand controlled by saidsignal relay, a normally deenergized stickrelay, a pick-up circuit for said stick relay including lee a back contact of said first section track relay and a front contact of said signal relay, a stick circuit for said stick delay including a back contact of said directional relay and a front contact of said despatchers relay, and

a branch for said home relay circuit around the front contact of the directional relay and including a front contact of said stick relay.

2. In combination, a stretch of railway track along which trafiic moves in both directions, such stretch being divided into sections each of which is provided with the usual track circuit including a track relay, a switch leading from a siding into the first section of said stretch, a switch repeater relay controlled by said switch and energized while the switch is in normal or reverse position but deenergized during transit of the switch, a normally deenergized despatchers relay, means controlled from a remote point for energizing said despatchers relay, a directional relay controlled by a front contact of said despatchers relay and a front contact of each of said track relays, a home relay, a circuit for said home relay including a front contact of said despatchers relay and a front contact of said directional relay as well as a front contact of the track relay for the first track section in said stretch, a slow-releasing signal relay controlled by a front contact of said home relay as well as by a front con tact of said switch repeater relay, a signal governing traflic into said stretch through said switch and controlled by said signal relay, a normally deenergized stick relay, a pick-up circuit for said stick relay including a back contact of said first section track relay and a front contact of said signal relay, a first stick circuit for said stick relay in- H eluding a back contact of said directional relay and a front contact of said despatchers relay, a second stick circuit for said stick relay including a back contact of said directional relay and a back contact of said switch repeater relay, and a branch for said home relay circuit around the front contact of the directional relay and including a front contact of said stick relay.

3. In combination, a stretch of railway track along which trafiic moves in both directions, such stretch being divided into sections each of which is provided with the usual track circuit including a track relay, a normally deenergized despatchers relay,

" means controlled from a remote point for energizing said despatchers relay, a directional relay, means for energizing said directional relay when said despatchers relay is energized provided said stretch is unoccupied, a home relay, means for energizing said home relay when said despatchers relay and said directional relay are energized provided the first section in said stretch is unoccupied, a slow-releasing signal relay controlled by a front contact of said home relay, a signal governing traffic into said stretch and controlled by said signal relay, a normally deenergized stick relay, means for energizing said stick relay when a train enters said first section provided said signal relay is energized at the time, means for subsequently keeping said stick relay energized as long as said despatchers relay remains energized, and means operating when said stick relay is energized to remove said home relay from control by said directional relay.

4c. In combination, a stretch of railway track along which traffic normally moves in both directions, such stretch being divided into sections each of which is provided with the usual track circuit including a track relay, a switch leading from a siding into the first section of said stretch, a normally deenergized clespatchers relay, means controlled from a remote point for energizing said despatchers relay, a directional relay, means for energizing said directional relay when said despatchers relay is energized provided said stretch is unoccupied, a home relay, means for energizing said home relay when said despatchers relay and said directional relay are energized, provided the first section in said stretch is unoccupied, a slow releasing signal relay controlled by a front contact of said home relay, a signal governing trafiic into said stretch and controlled by said signal relay, a normally deenergized stick relay, means for energizing said stick relay when atrain enters the said first section provided said signal relay is energized at the time, means for subsequently keeping said stick relay energized as long as said despatchers relay remains energized, other means for keeping said stick relay energized during transit of said switch, and means operating when said stick relay is energized to remove said home relay from control by said directional relay.

In testimony whereof I afiix my signature.

PAUL P. STOKER.

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