Patent GB-802443-A (GB)
Title: Improvements in or relating to railway route-setting equipment
IPC: B61L19/06
Filed: 1956-02-24
Abstract: 802,443. Railway route setting systems. STANDARD TELEPHONES & CABLES, Ltd. Feb. 24, 1956 (Feb. 26, 1955], No. 5889/56. Class 105. In a railway route-setting equipment having for each route points a normal and reverse selection relay to select the position of the points for a desired route, normal and reverse setting relays to effect the change-over of the points where necessary and points locking relays, on operation of a route terminal switch defining one end of a route, a first selection circuit is set up including the selection relays for the required positions of all the points trailed in one direction of travel over the route and the points setting and locking relays of all points trailed in the reverse direction and on operation of the route terminal switch defining the other end of the route a second selection circuit is set up including the selection relays of all points trailed in said reverse direction and setting relays and locking relays of points having selection relays in the first selection circuit whereby the selection relays in the first selection circuit are operated followed by the selection relays in the second selection circuit, the selection relays effecting the operation of the points setting relays in the two selection circuits to changeover points not in the positions required for the route and the points setting relays effecting the operation of the points locking relays to lock the points required for the route. The setting and locking of the points is effected progressively, starting from one end of the route. For setting a route from section b to section 6, Fig. 1, the terminal switches Tb, T6 defining the route ends, are operated in any order. Assuming the switch T6 to be operated first, to close contact T6, Fig. 2, a circuit is completed for the reverse position selecting relay A3 - of the points W3. This circuit is over the back contacts A32 + and V34 of the locking relay V3 (windings V31, V32, Fig. 3) of points W3. At front contact A31 - the circuit is extended to the circuits representing both routes diverging from the points W2. Relay A1 - is operated over back contacts A23+ of normal position selecting relay A2+ of points W2 and V14 of the locking relay V1 of. points W1. At back contact A32 -, Fig. 2, relay A3<SP>+</SP> is disconnected. Front contact A34 - bridges back contact V34. When switch Tb is operated, contact Tb, Fig. 2, is closed to complete a circuit for relay Pb which is held over its front contact Pb2. At front contact Pb1 Fig. 3, relay A2+ is operated over back contacts V23, and A22 - , to select the normal position of the points W2. At back contact A22+, Fig. 3, relay A2 - is disconnected and front contact A24+ bridges contact V23 of locking-relay V2 of points W2. At back contact A23+, Fig. 2, relay A1 - is released and front contact A23+ prepared a circuit for the winding V21 of the latch type locking relay of points W2 and if this latter is already in the normal position when contact A23+ is changed over, points W2 is locked in this position over front contacts A31 - , A23+ and back contact S21 - . Front contact A24+ bridges back contact V23, Fig. 3. If points W3 is in the normal position when front contact A21+ is closed, the reverse setting winding S3 - of relay S3 is energized over front contacts A21+, A33- and S31+, and on operation causes the points W3 to be moved to reverse position. When winding S3 - is energized, the armature of winding S3+ is released and contacts S31 + and S31 - are changed over. The locking winding V31 for locking points W3 is then energized over front contacts A21+, A33 - and back contacts S31+. Relay P6 is operated over front contacts A21+ and back contacts A33+. At front contacts P62 a lamp L6 is lighted to indicate that switches T6 and Tb may be released. The selection circuits may be released by any known suitable means. The component circuits shown may be united into one circuit, and the two selection circuits may be combined in series, forming a loop having an outward branch and a return branch.