Patent GB-190825597-A (GB)
Title: Improvements in and relating to Apparatus for Igniting Miners Safety Lamps in Underground and like Places.
Inventor: HAILWOOD ERNEST ARTHUR
Filed: 1907-12-09
Granted: 1909-01-11
Abstract: 25,597. Hailwood, E. A. Dec. 9, 1907. Miners' and like safety lamps.-Apparatus for electrically igniting miners' lamps of the kind described in Specifications No. 21,009, A.D. 1905, No. 25,258, A.D. 1906, and No. 12,274, A.D. 1907, is constructed so as to prevent the apparatus from being readily tampered with, and to prevent sparks from being obtained therefrom, the apparatus being of the type in which hinged, pivoted, or sliding chamber doors are used in conjunction with stationarylamp-chambers. Specification No. 27,140, A.D. 1907, is also referred to. As shown in Figs. 1 and 2, a lamp chamber A is provided with a hinged door B, which may be fitted with a subsidiary lamp chamber, or the chamber A may be fitted with a lamp basering comprising a fixed segment C<1>, and a sliding ring part C<2>, actuated by a screw C<4>, and carrying a contact which is completed when the lamp is clipped between the parts C<1>, C<2>. This base-ring may be replaced by two semicircular rings actuated by links which also cause contacts to connect when the rings grip the lamp. The igniting-circuit is closed by the movement of the door B, a cam rod R acting on a bowl R<1> on a push S<1> which is provided with a contact S<2> ; this joins with a contact S<3> at the same time as the push S<1> contacts with the lamp. The wires pass through a tube T. The push S<1> may be formed of two parts normally separated by springs. The cam R may actuate a switch similar to the one described in Fig. 21 of Specification No. 27,140, A.D. 1907, and this switch may be actuated by a cord. A guard G with an aperture G<1> is attached to the door B, and permits the push S<1> to move on the lamp only when the door B is closed. In a modification, Fig. 3, the lamp-chamber A is fitted with a switch operated by the weight of the lamp. The lamp is carried by a rod H raised by a spring H<2>, whereupon a contact S<5> contacts with an uninsulated part H<4> of the rod. The part H<4> is arranged between insulated parts H<3>. The weight of the lamp may depress a spring base C<7> with a curved part C<8>, which is depressed on to a contact S<6>. The door B is fitted with a guard G having an aperture G<1>. In a further modification, a switch may be used which can only be actuated by the eyelet of the lamp after the manner described in Specification No. 27,140, A.D. 1907. The following features are also described in Specification No. 27,140, A.D. 1907 : (1) a balanced hook for suspending the lamp from, (2) the slot-cam for actuating the spring- 'controlled base guard-plate is replaced by a cam rod attached to the hinged lamp door, (3) the chamber A may be fitted with an inner guard-plate door. In further forms, the lamp may be connected to the chamber A by projections on the lamp engaging bayonet-slots in a fixed lamp ring, or the lamp may screw into the ring, hidden switches in both cases being closed when the lamp is connected. The lamp may be fitted into a subsidiary chamber A', Fig. 13, connected to the chamber A by lugs N which engage horizontal slots N<1> in chamber A communicating with vertical slots N<2> provided with hidden switches. A guardplate G is automatically actuated by the door of the chamber A.