Patent GB-405622-A (GB)
Title: Improvements in miners safety lamps
IPC: F21L23/00
Filed: 1932-05-02
Abstract: 405,622. Miners' safety lamps. HAILWOOD, E. A., Beacon House, Texas Street, Morley, near Leeds. May 2, 1932, No. 12535. [Classes 75 (i) and 75 (iv).] A miners' safety lamp comprises an outer case or cover, with outer protecting glass, and a lamp unit mounted and locked within the case and formed with a flame control chamber, bottom gauzes, and a large air passage through the oil reservoir, means being provided for ensuring proper registration of the various parts. The inner lamp unit comprises a fuel vessel V located within gauze cups C, C<1>, a flame control chamber F, inner glass G, and upper gauzes J, J<1>. The flame control chamber F screws onto a flange D on the gauze cup C<1>, and a flange V on the vessel V and a flange on the gauze cup C are held between the chamber F and flange D. Lugs P on the fuel vessel fit in recesses in the chamber F to fix the relative position of the two parts. The flange D rests on the upper edge of a lower inner casing A, which is provided with side openings A<1>, a base 0, and a screw-thread A<2>. The fuel vessel V is provided with a central semi-cylindrical air shaft 5, and apertures V<2> in its flange. The flame control chamber F carries an igniting member, a wick-raising member W shaped as shown, and members N comprising bent wings mounted on shafts N<2> operated by thumb-pieces N<3> so as to control the flow of air to the flame. The glass G is partly surrounded by a semi-cylindrical part F<2> carried by the chamber F, and formed near its upper edge with an internally threaded ring F3. The ring T carrying the gauze F threads onto this, and presses the ring J<2> carrying the gauze J<1> onto the glass G. If the gauze J<1> is left out, the ring T will not tighten down onto the glass G, which therefore by its looseness indicates the absence of the gauze J<1>. The ring T is held in position by a spring engaging notches on the outer or under side of the ring. The outer casing comprises a lower part O<1> screwed onto the lower inner casing A, an outer glass G<1>, and bonnet O<5>. The lower part O<1> carries arms O<3> with spaces between enabling the passage of air and adjustment of the flame controllers and wick. The bonnet is carried by a ring M which is carried by uprights O' on the arms O<3>, and which may have apertures for the passage of air. Air passes between the two glasses G, G<1>. The bonnet has apertures O<6> and elongated apertures O<7>, protected by the guard Ox and auxiliary plates O<8>. Air passes from the openings between the arms O<3>, through the openings A<1>, the gauze cups C, C', and the shaft S and apertures V<2>, to the flame. In order to lock the inner lamp unit in the outer casing, a bolt R sliding on the outside of the casing O<1> fits into an opening or recess R<1> in a flange on the base 0 of the inner casing A, and is held by a spring-pressed bolt R<2> engaging ratchet teeth on the bolt R. To release the bolt R the bolt R<2> must be magnetically withdrawn. For handling of the inner unit, a hooked bail or stirrup may be attached to eyes on the chamber F, or a stirrup may be attached to the ring T.