Patent GB-565096-A (GB)
Title: Improvements relating to electrically controlled route-setting systems for railway points and signals
IPC: B61L19/06
Filed: 1943-02-26
Abstract: 565,096. Railway route-setting apparatus. SIEMENS & GENERAL ELECTRIC RAILWAY SIGNAL CO., Ltd., HORLER, F., and SULSTON, J. Feb. 26, 1943, No. 3169. [Class 105] In a railway route - setting apparatus in which non-interlocked switch keys are arranged on a panel diagram with the routes set up by operating, in the sense of the traffic direction, the pair of keys corresponding to the two ends of the route, the switch keys are biassed to their unoperated position, but the key corresponding to the entrance point is held in the operated position by an associated electromagnet. Fig. 1 shows a miniature diagram panel with switch keys A ... F which correspond with the signal locations and are normally biassed to a middle position but moved to one side or the other in accordance with the desired direction of traffic over a route which is set up by operating the panel keys corresponding to the two ends of such route. Fig. 2 shows the circuit arrangement and Fig. 5 the modification where a through route past an intermediate signal is to be set up. The switch keys may be of the form described in Specification 390,572. To set up the route E-C, the switch keys E, C are moved to the right, whereby a magnet E-DMY is energized over right-hand contact 1 of key E and back contacts 2 of relays ES1, ES3 to hold key E in its operated position. Also a route relay E-CPR and relay CS1 are energized over contact 4 of key E at the right, back contact 3 of a route relay E-FPR, winding of the route relay E-CPR, back contact 3 of a route relay B-CPR, contact 5 of key E, contact 2 of key C at the right, winding of relay CS1; closure of a front contact 1 of relay CS1 in parallel with key C contact maintains energization after release of the key C. Route relay E-CPR being energized effects in known manner the operation of the necessary points for route EC and clears the signal E. For example, the points and signal may each be operated under the control of the interlocking relay described in Specification 515,793. Release of the circuit is effected by pulling on the key E to de-energize the holding magnet E-DMY. To set up the through route A-C past the intermediate signal location B, the keys A, C are moved to the right, whereby contact 1 of key A energizes its holding magnet A-DMY end contacts 4 of the keys A and C energize the through-route relay A-CPR. This throughroute relay A-CPR is maintained energized over front contact 4 of relay BS1. contacts 1, 3 of relay A-CPR and contact 6 of key B unoperated. Contact 2 of key A energizes route relay A-BPR over contact 2 of throughroute relay A-CPR and winding of relay BS1, while contact 4 of through-route relay A-CPR energizes route relay B-CPR over back contact 3 of route relay E-CPR, right-hand contact 2 of key C, and winding of relay CS1. Thus the route relays A-BPR, B-CPR have been energized to set the component portions of the through route and clear the entrance and intermediate signals A, B. Release is effected by pulling on the key A to break the circuit to its holding magnet A-DMY to the throughroute relay A-CPR, but this latter is maintained energized by a back contact 1 of a relay ATC whilst a train is approaching.