Patent GB-190728255-A (GB)
Title: Improvements in Apparatus for Electrically Igniting Miners Safety Lamps or the like.
Inventor: HAILWOOD ERNEST ARTHUR
IPC: F21L23/00
Filed: 1907-12-23
Granted: 1909-01-25
Abstract: 28,255. Hailwood, E. A. Dec. 23. Miners' and li7ce safety lamps.-In apparatus for electrically igniting miners' safety lamps &c. underground of the kind described in Specifications No. 21,009, A.D. 1905, No. 25,258, A.D. 1906, and Nos. 12,274 and 27,140, A.D. 1907, the construction of the cham bers or casings and doors, and operating- devices in connexion therewith, is modified in various ways. A fastening-device for the doors is also described. In one form, Fig. 1, the source of electricity is contained in a cylindrical or semicylindrical chamber A, formed with an opening A<1> and fitted with a sliding or revolving door B with an opening B<1>, which may be made to coincide with the opening A<1>. The opening B<1> is fitted with a hinged door X', which may be locked. Portions B<8> of the chambers may be made a slack fit so as to allow exploded gases to escape without danger, and portions B<9> of the chamber A may be thickened to give greater strength. The lamp chamber A<2> is supported above, and may be integral with the chamber A, and its doors B<3> may, as shown, be integral with the door B. The lamp chamber is fitted with several shaped parts, such as a fixed part C, and a part C' hinged about vertical or horizontal pivots. Air ducts C<3> in the parts C, C<1> allow air for combustion to reach the lamp, and the products of combustion or explosion to escape. Above the crown of the chamber A' is fitted a push aperture D<1>, which may be guarded by a disk E carried by a detachable cap B<5> secured to the door B3, and a switch S provided with strong and weak springs is adapted to be actuated only when the chamber A<2> is closed. A guard, such as E, may be fitted in the base of the chamber A<2>. In a modification, Fig. 2, two independent doors B, B<3> are guided by one guide B<7>, and the guard E is actuated by a rack G on the door B<3>, and gearing G', G<2>. The switch employed is actuated by a groove cam in the door B<3>, which acts on a roller H carried by a plunger arm adapted to depress a contact D' on to the lamp, somewhat after the manner described in Fig. 21 of Specification No. 27,140, A.D. 1907. The roller arm H' is supported by springs on stud pins J, J<1>, ballbearings being arranged between the virtually movable parts of the arm H<2> and the pins J, J<1>. A cam-operated lever switch, or a hand-operated switch may be used on the modification shown in Fig. 2. In further modifications, the chamber A is fitted with a sliding door provided with a flange, which engages in a groove, and a hasp and padlock serving to lock the door, and the chamber A is fitted with a sliding door and chamber B combined in one. The door B, Fig. 10, is combined with the door B3, and a dynamo N<2> arranged in the chamber A is adapted to be operated by a handle N<1>, which is fitted with a clutch &c. for engaging the dynamo shaft only when the doors are closed. The door B is fitted with a padlock M<1>, and a spring fastening M' locks the chamber A and door B. A hinged or sliding door may be locked in position by a hinged pin M<3>, Fig. 11, fitted with a nut M', which is engaged by a forked bracket M', and is locked in position by a cottar pin, which is secured by a padlock. A part M<7> of the bracket, or a part of the apparatus, prevents the nut M<4> from being rotated when the device is locked. In a further modification, the chamber A<2> is adapted to be depressed by a cam during the closure, and an aperture in the side of the chamber A<2> alines with a cam-operated switch at the required time to permit the passage of the switch into the chamber. In a further form, Fig. 14, a dynamo N<2> is carried in a chamber arranged above the lamp chamber A<2>, and a guard-plate E, and cam-actuated switch S<2> are employed. A steel tube carrries one wire to the base of the chamber A'. The dynamo is operated by the rotation of the chamber B<3>, and the guard E moves aside only when the chamber A<2> is closed. In further modifications :-(1) The chamber A is fitted with a cylindrical extension, which is closed by a deep cylindrical cap or door. This door makes a flame-tight joint and is fitted with a padlock fastening.. (2) The chamber A is fitted with a door, which may be raised vertically. (3) A chamber A with a flat top is fitted with a flat door pivoted at one side so as to be capable of being swung sideways in an horizontal plane. According to the Provisional Specification, the inner lamp chamber may be formed in two parts, and the lamp is placed on a platform, which may be moved by a hook and cord. Also the upper chamber may be provided with a hinged lid having connecting links or arms, and push-guards. The links are provided with rigid or hinged cheeks secured in position by bolts, or hinges and locks and hasps.