Patent GB-863081-A (GB)
Title: Electrical interlocking route-setting equipment with overlap track fouling protection
Filed: 1957-07-12
Abstract: 863,081. Route setting. STANDARD TELEPHONES & CABLES Ltd. July 12, 1957 [July 18, 1956], No. 22157/57. Class 105. In an electrical interlocking route-setting system in order to set up fouling protection in an overlap track section S1-DUIE, Fig. 1, of a train route set up to the left of signal S1, the control relays associated with the points and signals being arranged in sets, preferably interconnected to represent the track diagram, as shown in Figs. 2, 3, after the setting of the points 1, 2, 3 in the overlap track, a proving circuit is completed between the relay sets of the points from the beginning S1 of the overlap track points by points via all possible paths to the end of the track DUIE and another proving circuit is completed from the end DUIE points by points via all possible paths towards the beginning S1 and the two proving circuits initiate the setting and locking of the fouling protection means such as the signal S2, points 4 and derail 5, for the overlap track. When the overlap track is set, a fouling protection setting and locking signal S/V is transmitted to the relay set 1 of points 1, and since the points are already set as required, i.e. normal, the signal S/V is passed on to relay set 2 of points 2, and those points being normal as required, the signal S/V is then passed on to relay set 3 of points 3 required at normal, and irrespective of the position of this points, on to relay set 5 of the derail 5 and also on to the end relay set DUIE. On reception of the signal S/V at set 5, the derail 5 is reversed and locked in this position, whereupon a proving indication signal U is set back from relay set 5, to set 3, and a further proving signal is sent back from set DUIE to set 3. If both U-signals have arrived at set 3, then together with a signal for route-proving or track-clearance indication of points 3, they are transmitted to relay set 2 at which the route proving signal is received and transmitted. via the set route circuit conditions to the set 1 where it is received and transmitted (if points 1 is in the correct position) to the set S1. Likewise, at the same time, a setting and locking signal S/V is transmitted in the reverse direction from the end set DUIE, Fig. 3, through set 3 to points set 2 from which the signal is transmitted to set 1 and set 4. At set 1 the signal S/V is transmitted to set S2 of signal S2 which is consequently put at danger. The signal received at set 4 brings the points 4 into the protective position, if not already in this position. Proving signals U are sent out from set 2 and set 4 and if the points on the route are properly set are received at set DUIE. These circuits may include contacts of relays which are dependent upon the correct position of the points in the overlap track. The locking of the protective points 4, derail 5, and signal 2 may be arranged so that when the setting signals are sent to these items, they may be used to lock the points 1, 2 and 3 at the same time. On completion of the setting and proving cf the overlap track, the signals U from set S1 and set DUIE and the signals S/V from sets DUIE and S1 are transmitted individually to the route proving circuit or signal stop circuit by the train route (i.e. to the left of S1). Alternatively, the proving signal in Fig. 2 can only be given by set DUIE when the return of the proving signal in Fig. 3 has reached set DUIE. If the overlap track is common to two routes, viz. ending at the signals S1 and S2, Fig.3, respectively, when the overlap track has been set up for one route S1 and is required also for the other route S2, a signal is transmitted from the set S2 to the set 1 of the junction points 1 and is transmitted back as a proving signal by the set 1 to the set S2. The relays used for setting, locking and proving the fouling protection means in the overlap track are the same control relays used for setting, locking and proving the fouling protection for train routes.