GB727195A - Improvements in or relating to pyrophoric liquefied gas lighters - Google Patents

Abstract

727,195. Lighters utilizing liquefied gas fuel. NATIONALE SOC. ANON. Feb. 18, 1953 [April 1, 1952], No. 4521/53. Class 75 (3). In a pyrophoric liquefied gas lighter having a portion of the fuel supply. tube of variable reduced cross-sectional area to control the flow of gas to the burner, a thermal resistance is located between the said portion and the burner and is so constituted that the heat transmitted to the said portion is at most equal to the heat of vaporization of the gas consumed. As shown this thermal resistance is constituted by the annular gas filled space 19 between an extension sleeve 15 of the fuel supply pipe 4 and the nozzle burner tube 16 which is slidably held in the sleeve by the turnedin end of the latter. The supply nozzle 14 on the end of the pipe 4 within the sleeve 15 is closed by a rubber member 20 on depression of the tube 16 by contact with the stop 25 on closure of the cover 24. The supply pipe 4 has a portion 13 of reduced cross-sectional area produced by flattening and then bending the tube and is adjustable by varying the free burner end position of the pipe by a screw actuated sleeve 21 against which the pipe is pressed by a spring 23. The nozzle tube 16 has a radial opening 18 communicating with the said annular space 19. The lower part of the pipe 4 is located in a fixing tube 5 with an enlargement 6 and internal recess larger than the external diameter of the pipe 4. The recess is connected with the storage chamber 2 by a passage 7. The pipe 4 is secured in the tube 5 by two rubber washers 8.compressed by a tightening screw 12 to form a fluid-tight joint and to clamp pipe 4 and between which washers is located a metal ring 9 loosely fitting over the pipe 4 and with a groove on its outer surface, and radial perforations 10. In another embodiment the thermal resistance is formed bv a small diameter tube with sufficiently thin walls welded in the end of tube 4 and forming the burner. The stop 25 on the cover is then of rubber, for example, to close the end of the burner tube on closure of the cover. Reference has been directed by the Comptroller to Specification 673,822.