Patent GB-160245-A (GB)
Title: Improvements in or relating to electrical signalling apparatus for use in mines and other places
IPC: B66B19/06
Filed: 1919-12-13
Abstract: 160,245. Imeson, F. E., and Hunter, C. Dec. 13, 1919. Mine signalling systems; order apparatus. - Relates to mine signalling apparatus of the type in which the circuits of indicator lamps k in the engine-room are controlled by a contact arm b on a ratchet-wheel a which is rotated by a pawl c<1> operated by a solenoid c energized each time the onsetter closes a switch. Each signal indicated in the engine room is simultaneously indicated at the onsetter's position, and remains visible until complied with by the engineman. A relay n is provided in the circuit of the solenoid c, whereby if a fault develops tending to energize the solenoid, the relay n is energized and closes a circuit through a warning-lamp n<2>. Means are also provided for locking the engine when a particular signal is given to indicate that men are entering the cage, the engine remaining locked until an " action " signal is given. The apparatus shown is arranged for transmitting signals from either of two onsetter positions to the engine room. The closing of either of the onsetters' switches d<1> or d<2> energizes a relay f<1> or f<2>, which closes the circuit of the solenoid c through contacts g<1> or g<2> and rings a bell h in the engine room. The arm b travels over the contacts j and closes the circuit of the lamp k in the engine room correspond. ing to the signal sent. The corresponding lamp k<1> or k<2> adjacent to the switch d<1> or d<2> in the onsetter position is also illuminated. The wheel a is released by magnets c<2>, e<2> which are actuated when the contact m is operated after a predetermined movement of the engine or the cage, or when the resetting-key m<1> is operated by the engineman. The wheel is returned to zero by a weight a<1>. Actuation of the relay f<1> closes the circuit of a relay q<1>, which completes a circuit through a lamp s<1> and locks itself over the contacts u<1>. Similarly the lamp s<2> is controlled by the relay f<2>. The lamps s<1>, s<2> indicate to the engineman which onsetter is sending. A relay v is connected across the windings of relays q<1>, q<2> and operates, when both these windings are energized simultaneously, to ring a bell v<3> and warn the engineman that both onsetters are sending simultaneously. To maintain those lamps illuminated which indicate that men are entering the cage until a subsequent " action " signal is given, a resistance w is inserted in parallel with the lamp 3 in question. When energized, the resistance w expands, and after a definite time interval, pushes the contact w<1> upon the contacts w<2> and w<3>, thus actuating the release magnets c<2>, e<2> and energizing the relay x, which puts itself into a circuit controlled by the contact y and closes the circuit of the lamps 3 over the contacts y, y<1>. When sending more than three raps the momentary passage of the arm b over the contact 3 is insufficient to actuate the time-lag device w. On the wheel a being rotated to indicate a subsequent " action " signal, the projection y<2> separates the contacts y and y<1>, and de-energizing the relay x extinguiches the lamps 3. The engine may be locked while men are entering the cage bv inserting a solenoid z' in parallel with the relay x. As long as the relay x remains energized the solenoid z<1> is actuated to cause the lever z<3> to lock the engine.