Patent GB-516576-A (GB)
Title: Improvements in or relating to electric interlocking systems for railway signalling purposes
IPC: B61L19/06
Filed: 1938-06-28
Abstract: 516,576. Railway signalling apparatus. VEREINIGTE EISENBAHN - SIGNALWERKE GES. June 28, 1938, No. 19179. Convention date, July 1, 1937. [Class 105] In an electric interlocking system for railway signalling a separate electric motor is provided for each points or track-locking lever and such motor actuates the control means and the associated interlocking contacts, the motor itself being controlled by a push button or other manual means. The signal lever or button may similarly be provided with such a motor The invention is illustrated in connection with a track-locking lever and signal lever both being in the form of press keys. The various points are first put to the required settings, the track-locking lever operated and then the signal lever operated; this clears the signal providing the block signal from an ahead station has been received. The passage of the train puts the signal to danger by the de-energization of an electric reverser, returns the signal-operating motor and the motor of the track-locking lever, and causes a block signal to be sent to the rear station. The levers thus do not have to be operated a second time to restore the apparatus to normal. When the track-locking lever is operated lamps are lit to denote any points which are wrongly set. On operating the track-locking press key 11, Fig. 1, a motor 20 is energized by a circuit over contacts 31, 32 of the points levers in required position and a circuit-controller contact 21 of the motor 20; the motor rotates to a reverse setting whereupon it automatically opens contact 21. With all the points levers correct a lamp 1 is lit. If any points lever is wrongly set then when the track-locking press key 11 is closed a relay 60 is energized and a contact 62 thereof in conjunction with a contact 35 of a wrongly set lever will light a lamp 9 identifying the wrong lever. The motor 20 opens a contact 201 to drop a stick relay 40. If the signal press key 13, Fig. 2, is now operated a relay 80 is energized by a circuit over contacts 33, 34 of the points in correct position, back contact 44 of the dropped stick relay 40, contact 202 of the motor 20 at reverse, a normally closed treadle contact 72, a contact 53 closed on receipt of the accepting block signal, contact 92 of a relay 90, unoperated cancelling contact 14, the signal press key 13, to the relay 80 and to an electric reverser 30 for the signal. The energization of the relay 80 drops the relay 90, Fig. 3, by opening contact 83, contacts 52 and 203 having already been opened. Front contacts 84, 81 annul the opening of contacts 92, 13 so that the relay 80 and reverser continue energized. The signal motor 300, Fig. 4, is energized over front contact 86, back contact 93 and circuit-controller contact 301 of the motor 300 to clear the signal. On the passage of a train the treadle contact 72 opens to de-energize the relay 80 and the signal reverser 30. Thus the signal is at once returned to danger and the signal motor 300 is returned by being energized over back contact 86 and the other circuit-controller contact 302. The motor 20 of the tracklocking lever is also returned by being energized over front contact 42 and circuit-controller contact 22; it should be noted that the relay 40 was picked up over a treadle contact 71, a contact 901 of a relay 900 denoting the signal motor at normal, back contact 82 and a contact 702 denoting the signal arm at danger. A rearward " normal" block signal is given by a relay 600, Fig. 8, being energized over a contact 74 closed by the train, back contact 87, front contact 703, and a contact 502 which was closed when the " accepting block signal was given. The relay 600 closes a contact 601 to energize a motor generator 1000 which energizes the block-signal relay 500 over front contacts 602, 603 and blockrelay contact 501 in the " accepting " position. The block relay 500 is thus put to the normal position and whilst the relay 600 is still up (by condenser discharge) a block signal is sent from the motor generator 1000 over front contacts 602, 605 and " normal " contact 501 to the rear block relay 400. For the " accepting " block signal a hand generator 2000 is used. The relay 90 is picked up when the contact 52 is closed by a " normal " block signal being thus received when the train passes the ahead station.