Patent GB-770721-A (GB)
Title: Lighter provided with a container for liquefied gas
IPC: F23Q2/16
Filed: 1955-04-29
Abstract: 770,721. Lighters using liquefied gas. THORENS SOC. ANON. April 29, 1955 [May 1, 1954]. No. 12524/55. Class 75(3) [Also in Group XXIX]  In a lighter provided with a tank 5 containing liquefied gas and connected to a burner 46 by means of an expansion device adapted to regulate the delivery of gas, the expansion device comprises an obturating member 13, Fig. 2, the position of which is a function of the gas pressure downstream thereof and of the ambient air pressure The obturating member co-operates with a calibrated opening 10 formed in a block 8 and connected to an opening 7 in the top wall 6 of the tank 5 and is carried by a cylinder 12 slidable in a recess 11 in the block 8. The cylinder 12 may carry a further obturating member which co-operates with the lower face of the block 8 to close the calibrated opening 10 when the cylinder 12 is accidentally lifted too far. The cylinder is urged to the closing position of the obturating member 13 by a spring 14 and has a slot 15, into which projects a screw 19 threaded into the cylinder and adapted to engage one end 18 of a pivoted lever 16 the other end of which abuts a push bar 28 engaging the inner surface of an elastic membrane 22 closing a chamber 20 connected to the recess 11. The outer surface of the membrane is pressed downwardly by a piston 23 slidable in a screwed plug 25 and submitted to atmospheric pressure through an opening 26 in the plug and to the action of a spring 27 disposed between the plug and the piston and adjusted by screwing the'plug into the block 8. The gas passes from the chamber 20 through a duct 31 in the block to a porous member 32 pressed on to the bottom of a further duct 33 in the block by a screw 34 having longitudinal grooves 35 for the passage of the gas to a chamber 38. A washer 39 with a calibrated bore 40 is clamped to the bottom of the chamber 38 by a hollow plug 41 screwed into the block and provided with an orifice 45 through which the burner 46 extends in sealed manner. The burner is urged by a spring 51 so that an elastic member 49 on its lower end closes the calibrated bore 40. The upper end of the burner is closed by a member 53, Fig. 1, carried by a lid 3. On opening the lid a finger 54 on the spindle 4 thereof co-operates with one end of a pivoted lever 55 the other end of which is forked and engages a flange 58 on the burner 46 to lift the burner and allow the gas to flow through the calibrated bore 40 into the hollow plug 41 and hence through radial passages 48 in the burner 46 to the axial duct 47 therein. The gas is ignited by sparks from a pyrophoric stone urged against a friction wheel 60 by a spring in a tube 59. The tank has a filling device comprising an obturator 69 mounted on a spring-urged slidable rod 71 and co-operating with a seat 68 at the end of a duct 73 leading from a chamber 74 provided with a sealing ring 75 which co-operates with the mouth 76 of a filling bottle 64. An extension 79 of the rod passes through the duct 73 to abut the end of a conical valve 65 closing the mouth of the bottle. On pushing the bottle upwardly the obturator 69 is raised and when a shoulder 77 on the rod 71 abuts the end face of the casing of the filling device the extension 79 of the rod opens the conical valve 65. The block 8 and burner 26 constitute a unit secured in the upper part of the body 1 of the lighter above the tank 5.