Patent GB-190413709-A (GB)
Title: Improvements in Automatic Electrical Signalling Apparatus for Railways.
Inventor: BINYON ALGERNON HAMO
Filed: 1904-06-17
Granted: 1905-06-08
Abstract: 13,709. Binyon, A. H., and Brousson, R. P. June 17. Signalling between trains. - In an automatic electric signalling system, the signalling current is obtained from two line-wires and is controlled by a relay operated from a battery or other source of current connected to the running-track. A manual switch is included for use in special circumstances, and relays are arranged to set signals at "danger" in cases of excess current passing through their coils. A battery a is connected to the forward end of each block section of the rails, which are divided into sections bv insulating-blocks, and normally energizes the relays B<1>, C', D' connected to the rails. These relays control the circuits to the solenoids BS, CS, DS, which in turn control the circuits to the signal lamps appropriate to the sections II, III, IV. When, as shown, no train is in section III. the relay C<1> completes the circuit to the solenoid CS which holds its armature S in its upper position and completes the circuit to the green lamp C<6> through the switches h,j, which are carried by the armature S. A train on section II short-circuits the current from the battery a, and de-energizes the relay B<1> and so breaks the circuit to the solenoid BS, the armature S of which then drops, opens the circuit to the green lamp, and completes that to the red lamp B<r>. The two switches h, j, and separate circuits to each lamp, prevent both red and green lamps from being lighted together. The circuit to the solenoid BS being broken and the armature S having dropped, the stop N prevents the armature S from rising, when the coil is energized by the train clearing the section, until the rear end of the train has reached a treadle contact q. The rear end of the train carries a shoe P in contact with the line-wire E (which may also on electric railways convey power for motors) and connected, preferably through a resistance, to a brush Q which is arranged to make contact with the treadle q. The treidle is connected through the switch k carried by the armature S of the solenoid BS, CS, DS, to a solenoid BO, CO, DO, which, when energized, retracts the stop N and allows the armature S to rise. The Figure shows an arrangement by which the stops N of the coils BS, CS are removed when the train has passed into section IV. In the case of excess current passing through the coils BO, CO, DO, contacts are arranged to break the current to the coils BS, CS, DS and so set the signals at danger. The coils BO, CO are shown provided with a second armature o<1> controlled by an adjustable spring y, this armature being moved only when excels current passes in the coil BO, CO. When the coil BO, CO has moved its armature o', the stop y<1> prevents its return. This prevents the signals from being set "clear" until the fault which causes excess current to pass has been remedied and the stop replaced by hand. In place of the second armature for the coil BO, CO, another arrangement, as shown in connection with the coil DO, may be used. The fuse v is inserted in series with the coil DO, and in parallel with this fuse is a coil V which, when the fuse blows, becomes energized, draws up its armature, and breaks the circuit to the coil DS. A stop y' is provided in this case also to prevent the completion of the circuit until the stop is replaced by hand. In case it is desired to set a signal at '' danger " as for section II until the previous train has passed to section IV, the circuit for the signal B is carried to the relay C<1>, and a second pair of contacts x controlled by the coil C' are inserted so that the circuit is not completed until both coils B', C', are energized. In case, in exceptional circumstances, it is required to replace a signal at "clear" for any section before this is done by a previous train, the switch Z, which is arranged to move over, without touching, until it is depressor the contacts b<z>, c<z>, d<z>, is included in a circuit from the line-wires through the releasing magnets BO, CO, DO. The depression of the arm Z on to a contact b<z>, c<v>, d<z> withdraws the stop N, appertaining to the magnet controlled by that contact, and, if the section controlled by the solenoid is clear, the signal is set clear. The relays B', C', D' are situated in proximity to the track, and the solenoids and releasing-magnets, together with repeating-lamps b<g>, b<r>, c<g>, c<r>. d<g>, d<r>, arranged in series with the signal lamps of the signals B, C, D, may be assembled in the signal cabm. The lamp signals may be replaced by semaphore signals, the solenoids being employed to actuate electrically-operated mechanism for the semaphore arm.