Patent GB-775793-A (GB)
Title: Improvements in or relating to railway route setting equipment
IPC: B61L19/06
Filed: 1955-04-12
Abstract: 775,793. Railway route-setting systems. SIEMENS & HALSKE AKT.-GES. April 12, 1955 [April 9, 1954], No. 10568/55. Class 105. In a railway route-setting equipment wherein the track points are electrically locked and safety points are controlled and locked depending upon the condition of the route points, safety position locking means and a safety position indicator are allocated to each points, the safety position locking means being operative when its associated points serves as safety points and the indicator being operative when its associated points serves as a route points and when associated safety points of the route points has operated. If the locking of a safety points is impossible because it is already locked in its opposite position the locking control signal is either repeated through a storage relay to the next points or warning signal or other protecting device for the intended train movement, or the storage relay controls the points to the safety position when the points become free. Assuming points W1, Fig. 1, is a route points and points W2 is acting as safety points for points W1 in respect of a route from C to E, a safety position indicator M is shown for the route points W1 and a position locking relay S for the safety points W2, but should the roles of the points W1, W2 be reversible, then both types of circuits are associated with each points. As soon as the points W1 is selected by a route-selection relay W1 (not shown) the condition of which determines the actual position of points W1, i.e. normal in the case under consideration, a circuit is completed for the locking relay S of the associated safety points W2 over f.c. B1 (front contact B1) of a route " engaged " relay B (not shown), b.c. R1 (back contact R1) of a shunting route relay which is unoperated when a locking of safety points is not to be effected, e.g. as for a shunting movement, contacts W11 normal, line L2, contacts W21 normal, contacts WS21 normal of the points setting relay associated with points W2, and contacts U1 normal of points indication detector, to the winding of locking relay S which operates to close a holding circuit over f.c. S4 and causes a locking of points W2 and at f.c. S2 a circuit is completed over contacts U11, W23, W12 all normal, and b.c. R2 for the safety position indicator M associated with the points W1. Indicator M indicates that points W2 is locked and controls the track signal (not shown) associated with the points W1. Should the safety points W2 be not in the correct position, then contact W21 would be in its reverse position and the circuit from f.c. B1, b.c. R1 W11 normal, line L2 would be diverted over W21 reverse WS23 reverse, b.c. S1, b.c. Z1 and contacts U12 normal rectifier V1 to the relays (not shown) controlling the points W2 setting these relays to change over the points W2 from reverse to normal position thereby re-forming the energizing circuit for the locking relay S. Should the points W2 be required as safety points for points W3 operating as a route points, the locking relay S would be energized over W22 reverse, WS22 reverse, since the points W2 would in this case be reversed or the points control relays would be reversed over W22 normal, WS24 normal, b.c. S3, Z3, U13 normal and a rectifier V2. Since points W2 can function as a safety points in both normal and reverse positions a double protection relay Z receives, over W25 reverse, rectifier V3 and f.c. S5, the setting control for points W2 if this latter is locked in the undesired position and provides two holding circuits for itself via f.c. Z5 and f.c. Z6 respectively, to store the signal so that when the points are returned to the desired position, contact S5 opens and contact S6 closes by cancellation of the original locking and the holding circuit over contact S5 is opened also at W25 reverse. Since normal contacts W21 and WS21 are now closed, locking relay S again operates and opens contact S6 to release relay Z, and locks points W2. Relay Z can repeat the control signal at f.c. Z7 to the following points adapted to take up a side protecting position for the points W1. At f.c. Z2 the indicator M is energized over f.c. S2U11, normal, W23 reverse, b.c. Z2, line L1, W12 normal b.c. R2 to indicate that points W2 is locked or that the protection control signal has been repeated to the following points.