Patent GB-569848-A (GB)
Title: Improvements relating to railway traffic controlling apparatus
IPC: B61L19/06
Filed: 1942-12-30
Abstract: 569,848. Railway route-setting apparatus. TOMLINSON, A. V. (Union Switch & Signal Co.). Dec. 30, 1942, No. 18507. [Class 105] In route-setting apparatus normal and reverse route relays are provided in respect of each points the appropriate route relays being energized in a route circuit set up by operating the push-buttons for the two ends of a desired route, the entrance direction of traffic being determined by the first button operated, operation of the first button effecting the energization of the route relays for all points to be traversed in the trailing direction, the operation of the other button then effecting the energization of the route relays for all points to be traversed in the facing direction. The push-buttons are preferably located close together on a miniature illuminated diagram panel. The route circuits. are arranged as two-wire loop circuits in which operation of the first button energizes the route relays for the trailing points over the out loop wire and operation of the second button extends the circuit to the return loop wire to energize the route relays for the facing points. The signal is cleared after the position of the points has been verified by points indication relays. Approach locking and sectional release locking is provided. Where the layout includes an intermediate signal " through " route-setting is provided only for the normal high-speed track route ; for other routes an intermediate pushbutton must be operated. In the following detailed description the relay-contacts will be denoted as closing their front or back contacts by prefixing f or b to the contact reference. Thus f25.AITR denotes front contact 25 of relay AITR. The various figures show the apparatus in the normal unoperated. state. To set up the high-speed through route from signal 4A to signal location 12 the operator briefly depresses , push-button 4P and then button 12P. The brief closure of contact 26 of button 4P picks up relay 4PS over contacts f25.AITR (track relay), b75.1RW, b76.1BNW (reverse and normal route relays for the points 1B of crossover 1A-1B). Relay 4PS then sticks over its own front contact 28 and normally closed "pullout" contact 27 of pushbutton 4P. Closure of f30.4PS applies source B to the out loop wires for the various routes emanating from signal 4A location so to energize the trailing point route relays. Thus route relay 1RE is energized over b.1BNW, b.1NWK, b.1ANE and extends the circuit over f31.1RE to loop wire 32, b33.5ANW, b34.8XS to relay 8XR whereupon route relay 5ANE is energized from a source B over f36.5TR, b.5RWK, b.5ANW, b.5RE; b111.1SP, f38.8XR, b39.8PS ; this in effect is the out loop of route circuit for route 4-8. Similarly route relay 3NE is energized from f30.4PS over b.1RW, b.1RWK, b.3RWK, b.3RE and extends the circuit over f40.3NE to out loop wire 41 and b.5RW, b.5RWK, out loop wire 42, b.7RWK, b.7RE to route relay 7BNE; this in effect is the out loop of the route circuit for the through route 4-12. As regards route 4-12 it will be noted that the energized route relays 3NE, 7BNE relate to the trailed points, and that contact 47 of relay 7BNE has rendered the pick-up circuit for push-button relay 12PS ineffective but that f44.7BNE extends the potential on loop wire 41, 43 to b45.12PS so that brief closure of the button 12P for the exit end extends this potential over b49.12PS, b50.7RE, &51.7RWK, return loop wire 52, b.5RWK, b.5RW, to route relay 5BNW contact 53 of which closes parallel with exit push-button contact 46 which can therefore be released. Contact f55.5BNW extends the potential to the return loop wire 56 to energize route relay IBNW over b.3RE, b.3RWK, &.1RWK, b.1RW. The route relays 5BNW, 1BNW energized in the return wire of the loop circuit relate to the facing points of route 4-12 and it will be noted that potential is extended to terminal 18 at the remote end of the loop circuit. This energized terminal effects the clearance of the signal as described later. The various points are operated to accord with the energized route relays as described later. It will be noted that the route relays IRE, 5ANE in the other out loop wire (corresponding to route 4-8) became deenergized by the opening of back contact when route relay 1BNW became energized. The various relays NWK, RWK are points indication relays. The points are operated as soon as their position for a route is determined. For instance a route from signal 2 requires points 1A normal whereas from signal 4A the route is not determined until the exit button has been operated and all the route relays involved have responded. Thus in the first case the points are operated to normal as soon as route relay 1ANE closes a first contact whereas in the second case the operation to normal is not started till route relays 3NE and IBNW have closed front contacts. The control circuits which include approach locking and sectional release are shown in Fig. 6. The points 1 are electropneumatically operated under the control of polarized relay 1WR energized in the normal direction over front contacts of a points lock relay 1LR and the route relays IBNW, 3NE. The points indication relays INWK (normal) and IRWK (reverse) are energized over front contacts of the points control relay IWR and of the normal or reverse correspondence relays 1NC, 1RC (points and points control relay in correspondence). The, signal control relays HR and signal mechanism circuits are shown in Figs. 2 and 7. The potential on terminal 18, Figs. 1c and 2 (route 4-12 set-up), energizes signal, control 4HR over b.12PS, f.5NWK, f.7NWK, f.3NWK, f.1NWK, f.4PS. Relay 4HR opens its back contact 62, Fig. 5, to de-energize approach locking relay 4AS and accordingly section locking relay AIES, Fig. 3, is dropped at open contact 67.4AS to open contact 73.AIES, Fig. 6, whereby points lock relay 1LR is de-energized. The opening of contact 68.AIES drops section locking relay 3ES, Fig. 3, whereby points locking relays 3LR, 5LR; 7LR, Fig. 6, are dropped at open contacts 124.3ES, 125.3ES, 126.3ES. Accordingly signal mechanism 4AG is energized - from.source B, Fig. 7, over f66.12AS (opposing direction approach locking relay), f.5NC, b130.7LR, b129.5LR, f.7NC, b128.3LR, f.3NC, f.1NC, b127.1LR, b65.4AS,f63.4HR, b80.4COS, n.5WP, n.1WP, f4TR, f.7TR, f.3TR, f.AITR, f.23HP, winding of mechanism 4AG, f.23HP, f 64.4HR. The setting up of the route is indicated on the miniature diagram, Fig. 10, by lamps illuminated in accordance with the circuits shown in Fig. 11. The route set-up is shown by white lamps 4K lit over f84.AITP, f57.1BNW, and white lamp 12K lit over f.7TP, f48.7BNE denoting the ends of the route and by white points indication lamps as follows : 1BNK lit over f84.AITP, f58.1NWK, f.1BNW; 3NK lit over f.3TP, f59.3NWK; 5BNK lit over f.3TP, f60.5NWK, f.5BNW; 7BNK lit over f.7TP, f61.7NWK, f.7BNE. The presence of a train in a track section such as AIT lights a red lamp AITK over M4.AITP. When a signal such as 4A is cleared the corresponding diagram lamp indication changes from red to 'green; this lamp would be flashed if a call-on signal is given as would be the case if a train were already in the section and the push 4P were re-operated thereby to pick up relay 4COS, a contact of which would connect flashing current to the signal indication lamp. When the route 4-12 is set up the sectional locking relays AIES, 3ES, drop thereby energizing relays AISP, 3SP, 7SP, front contacts of which maintain the diagram lamps lit to show the route set up when the route relays have become de-energized by the entry of the train causing relay 4PS to drop and so open f 30.4PS. The white lamps 4K, 1BNK denoting part of the route set up are extinguished at contact f84.AITP opened when the train enters section AIT but red lamp AITK denoting occupation is lit at b84.AITP. Similar actions arise as the train passes through the later sections. Specifications 499,340 and 533.218 are referred to.