Patent GB-190707251-A (GB)
Title: Improvements relating to Block Signalling.
Filed: 1907-03-26
Abstract: 7251. Compagnie de Signaux Electriques pour Chemins de Fer. March 26, 1906, [date applied for under Patents Act, 1901]. Void. [Published under Patents &c. Act, 1907.] Automatic systems; contacts, electric.- In an electric automatic system, electric lamp signals on the track are actuated by the train passing over track contact-bars in conjunction with relay apparatus at each station. Similar relay apparatus, as shown diagrammatically in Fig. 1, is provided at each station. As far as can be understood from the description, the detailed operation of the system is as follows :-A train travelling from a station A, say, to the left hand in the Figure, arrive, at a station B, and energizes the relay a at A by connecting the contact-bar b at B to the rail D, provided that the relay a at B is de-energized, so that its armature connects contacts 39, 40. The switch i controls the circuit of the magnet h, and is actuated by electro-magnets j, k, each magnet j being in circuit with the corresponding magnet k of the station to the rear. The armature of the magnet h controls circuits through the white signal lamp f or the red signal lamp g. If the relay a at the station bebind A is de-energized, the train in passing over the contact-bar b at this station closes a circuit from this bar b through the wires 31, 44, contacts 39, 40, wire'. 45, 47, resistance n, wires 48, magnet k, wire 50, wire 1 at station A, contacts 4, 3 (provided that the relay a at A is de-energized), magnet l, wires 6, 7, 8, 9, 10 to the negative rail E. If the relay a at the station behind A is de-energized, the red lamp gat this station is lit. At the same time the magnet j at A is energized, the circuit being through the wire 2, magnet j, and the wires 6 ... 10 to the negative rail E. The switch i at A then closes contacts 21, 22, and closes a circuit through the magnet h at A from the positive rail D at B through wires 11, 12, contacts 13, 14 of the energized relay a at B (the armature of the relay a being maintained in its raised position by a catch), wire 15, resistance m at A, wire 17, contacts 18, 19 (provided that the relay a at A is energized), wire 20, closed contacts 21, 22, wire 23, magnet h, and the wires 24, 25, 6 ... 10 and the negative rail E. The white lamp f is then lighted through the circuit from the p sitive rail D to the contacts 27, 28, wire 29, lamp f, and the wires 30, 25 to the negative rail E. The white lamp signal is given at the station A when the train passes the station to the rear of A, if the track is free between A and B. A train arriving at A actuates the contact-bar b, and energizes the magnet e, withdrawing the catch from the armature ot the relay a, which falls and opens circuit between the contacts 18, 19 to de-energize the magnet h, the armature of which falls, breaking the circuit of tie white lamp f and closing the circuit of the red lamp g. The armature of the relay a at A falls, and closes circuit between the contacts 37, 38, which "connects the rail E to the wire of the signal of the train before the station A," and also opens circuit between the contacts 41, 42, and closes a circuit between the contacts 39, 40 of the relay a at the station to the rear of A from the bar b at station A through wires 31, 44, contacts 39, 40, and wires 45, 46, 43 to the relay a at the station to the rear of A, thus unblocking the signal at the second station to the rear of A. Another circuit is closed from the bar b at A through the wires 31, 44, contacts 39, 40, wires 45, 47, resistance m, magnet k at A, wire 50 to the magnet at station B, and to the negative rail E. The switch i at A is thus actuated to break the circuit between the contacts 21, 22, and de-energizes the magnet h, to light the red lamp at A. The train passing the station B acts in similar manner upon the various circuits. The action of the system in case of various defects arising is also detailed.