Patent GB-216568-A (GB)
Title: Improvements in and relating to automatic railway signalling systems
IPC: B61L3/04
Filed: 1923-02-26
Abstract: 216,568. Amodeo, T. G. Feb. 26, 1923. Mechanical systems, automatic; track apparatus actuating signals on, and other than on, trains, and stopping trains.-In a signalling system of the kind in which a train entering a section automatically sets a signal against a following train. and at the same time sets a signal at the remote end of the next succeeding section against a train coming in the opposite direction, the signals are appropriately marked at front and rear so that the driver of a train arriving at a signal previously set by him can, by observing the rear side of the signal see whether the apparatus is acting to give a danger signal ahead to an oncoming train. An arrangement is described for giving a warning signal, o:r stopping a train over-running a signal at danger. As described, semaphore arms 10 - - 13, 15 - - 18 normally hanging in a vertical position are carried in pairs on posts 5 - - 8 at the ends of the sections 1 - - 3. Each " behind " signal (15 - - 18) is connected to the "ahead signal (12, 13 &c.) at the remote end of the next adjacent section, two connected signals being operated simultaneously. The operation may be electrical, but is described as effected mechanically by arms 22, 23 co-operating with a shoe on the train. A train running from left to right, Fig. 1, co-operates with arms 23 to set the signals. On entering section 1, the previously set s:gnal 10 is returned to normal. Signal 15 is then set against a following train and at the same time signal 12 set against a meeting train. On passing to section 2, signal 11 is returned to rormal, and signals 16, 13 are set against a following and meeting train respectively. On passing to section 3 signals 12, 15 are returned to normal, and signal 17, &c. is set. Similar signalling operations are effected at succeeding sections. A like series of operations is performed by a train moving from right to left co-operating with arms 22. The left face of each arm 15, 16 &c., and the right face of each arm 10, 11 &c. may be coloured red, the other or rear side of each arm being green. An arrangement of signals for use at a junction is described. Track contacts. Each arm 22 is mounted at right-angles to, but spaced apart from, an arm 23 on a common spindle which carries a pinion, not shown, engaging a rack bar 20, Fig. 6 operating the corresponding signals through suitable connections. Train apparatus. A shoe 26 carried by the train is transversely movable on rods 27, and is moved, as by a connection from the reversing gear of the locomotive, to co-operate with one or other of the sets of arms 22, 23 according to the direction of running. For stopping the train or giving a warning when the train passes a signal at " danger," two depending arms 29 are carried by a spindle 28 provided with a riser 30 which supports a spring-pressed plunger 31. One or other arm 29, according to the direction of running, is protected by the shoe 26, co-operating with, say, the arms 23. When the train passes the track device of a signal set at " danger," the aim 22 co-operates with the unprotected arm 29 to release plunger 31 and operate the whistle &c. through a connection 32.