Patent GB-528326-A (GB)
Title: Improvements relating to railway traffic controlling apparatus
IPC: B61L19/06
Filed: 1939-04-25
Abstract: 528,326. Route setting apparatus. WESTINGHOUSE BRAKE & SIGNAL CO., Ltd., and VENNING, C. F. D. April 25, 1939, No. 12435. [Class 105] In route-setting apparatus comprising routesetting and route-locking relays, a routesupervising relay is provided to control the return to normal of the route-locking relay, or a visible indication that the route-setting switch should be re-set to normal, or both, the route-supervising relay being controlled in accordance with track conditions at a suitable point in the route. If desired, a single routesupervising relay may be used for all routes, having the same entrance. Fig. 1 shows the circuit arrangement for a selected (No. 1) route. The setting up of this route is controlled bv energization of reverse winding ILR (R) of the associated route-setting and locking relay, the reverse position being maintained until the normal winding ILR (N) is energized and winding ILR (R) de-energized. The circuit of winding ILR (R) includes a front contact of the route supervising relay IRR, a reverse contact 1 (R) of the route control switch and interlocking normal contacts XLR (N), YLR (N), ZLR (N) of route relays of conflicting routes, these contacts being open when the corresponding relay is in reverse position. Similarly, contacts (not shown) of relay ILR are included in the reverse circuits of conflicting route relays. The circuit of normal winding ILR (N) includes a normal contact 1 (N) of the route control switch, in parallel with a back contact of supervising relay IRR, and a front contact AR of the approach-locking relay. The pick-up circuit of relay IRR includes a series of normal contacts 1 (N), 2 (N) &c. of the route control switches of all the routes with which relay IRR is associated. Its stick circuit includes in series its own front contact and a front contact NTR of a relay controlled by a suitable track circuit in the route or routes with which relay IRR is associated. A back contact AR of an approach-locking relay for the common entrance to these associated routes is preferably provided in parallel with contact NTR. When no route is set, relay IRR is normally energized, contacts 1 (N), 2 (N) &c. being closed. When a route control switch is operated to reverse, its contact, e.g. 1(N), is opened, but relay IRR remains energized over its stick circuit until the train passing over the selected route reaches the track-section controlling contact NTR, whereupon relay IRR is de-energized. Closure of the parallel back contact AR when a vehicle is approaching the clear signal prevents interruption of the stick circuit by de-energization or failure of the tracksection controlling contact NTR until the signal is passed. De-energization of relay IRR opens its front contact in the circuit of winding ILR(R) and closes its back contact bridging contact .I(N) of the circuit of winding ILR(N), thus restoring relay ILR to normal. The Specification describes an alternative arrangement in which relay IRR is normally deenergized, but becomes energized when a back contact NTR of the pre-determined track section is closed by passage of the train or vehicle. Instead of, or in addition to, the restoration to normal of relay ILR, relay IRR may serve to give an indication that the route control lever should be re-set to normal. The Specification shows the provision of an independent indication lamp circuit in connection with each of the above route circuit arrangements, the lamp circuit being closed by a back or front contact of relay IRR, respectively. A lamp circuit is also described using a signal indication lamp, contacts of relay IRR serving to switch over from a continuous to an intermittent current source tu give the desired indication..