Patent GB-812730-A (GB)
Title: Railway signalling equipment
IPC: B61L19/06
Filed: 1956-09-21
Abstract: 812,730. Railway signalling equipments. STANDARD TELEPHONES & CABLES Ltd. Sept. 21, 1956 [Sept. 23, 1955], No. 28931/56. Class 105. In a railway signalling equipment for a bothway route formed of a first portion including the main track a, Fig. 1, and at least one points 1, 2, and a second portion including the station track 5 and at least one points 3, 4 and having for each direction of travel over the route a distant signal f or g at the entrance of the respective routes, e.g. located respectivelyon the posts of the home signal A and the starting signal N, and an exit signal F or G respectively at theroute exits and an intermediate distant signal v located between the two route portions for the direction of travel only from track a to track 5, a first control circuit UG to Hv,'Fig. 2, is provided for the first route portion a-v and a second control circuit Sv-UF, Fig. 2, is provided for the second route portion v-5, each circuit containing an electrical contact UG or UF responsive to the operation of the exit signals G or F and a contact such as 1 +, 1 -, &c., to 4 +, 4 - for each points 1-4 included in the corresponding route portion and adapted to close when the appropriate points is locked in the position required for the route and a relay such as Sf, Sg for operating the distant entrance signal for g; and change-over switching means such as relay Hv operable when the first control circuit UG-HV is energized during the establishment of a route for travel from track 5 to track a, is in the direction to which the signal v does not relate, to energize, over the front contact Hv1, the second control circuit including relay 5g to operate at front contact Sg1 the distant signal g at the route entrance for the route 5-a in accordance with the aspect of exit signal G. For the route a-5 switching means assigned to the end of the route responds when the route is set and closes contact D, and with signal F showing clear aspect, contacts UF will be closed so that a circuit is completed for relay Sv over contacts 4+, 3+ and Hv1. Closure of contacts Sv1 lights the clear-light lamp-Lv of the distant repeater signal v and operation of contacts Sv2 energizes the relay Sg over contacts UA reversed apertaining to signal A in the line clear aspect. Closure of contacts Sg1 lights the clear light lamp Lf of the distant signal f, so that the train can proceed over the route, the individual points being released in turn if the points concerned has been occupied and cleared again by the train and the points in the rear have been released. The release of the locking of points 3 depends upon the operation of relay A3, Fig. 3, which is prepared by contacts X2 of the points 2, reversed when the locking of points 2 is released, and with the route traversed contacts UF open to release relay Sv and close its contacts Sv3, Fig. 3, to complete the circuit for relay A3 over contact W3, normal dependent upon position of points 3 and contacts X3. Relay A3'operates to initiate release of points 3. For the route 5-a when set up, a circuit is completed for relay Hv over contacts UG, B, UA, H, 2 + and Sv2. At contacts Hv1, the energizing circuit of distant signal repeat control relay Sg is completed from contacts UG over contacts 3 +, 4 + and UN operated since signal N shows clear aspect. Closure of contacts Sg1 lights the clear light lamp Lg of the distant repeater signal g. As the train passes over the route the points are released as heretofore described for the route a-5. In a modification the series-connected circuit from contact UG to UN and/or from contacts UF to UA may be interrupted as indicated at y-y and voltage applied to the upper circuit upon reversal of contact Hv1.