GB776944A - - Google Patents

Abstract

776,944. Igniting burners. THORP & CO., Ltd.. T. Oct. 10, 1955 [Oct. 18, 19541, No. 29882/54. Class 75(3) [Also in Group XXIX] A safety cut-off device for gas consuming appliances comprises a hollow plug a having ports m, k in its wall to pass gas to the main and pilot burners respectively, a handle c for turning the plug and also operating gas igniting means for the pilot burner, and a spring-loaded main valve j seating on the end of the plug but held open by the expansion of a closed chamber g<SP>1</SP> so long as the pilot flame is alight, a peripheral recess b being provided in the plug to by-pass the valve j and so supply gas to the pilot burner when the plug is turned against spring pressure to the position in which the gas igniting means is operated. When the handle c is released, it moves to the normal service position Fig. 6 in which the ports m, k are open and the recess b is cut off from a passage e leading to the pilot-burner f. The body of the device is formed with a gas supply passage d, a passage n leading to the main burner of the appliance and a further passage k<SP>1</SP> to the pilot burner f. The closed chamber g<SP>1</SP> is bounded by a rigid cover g heated by the pilot flame and a diaphragm h acting on the valve j through a spindle i. The gas igniting means comprises a coil arranged in a tube r, Fig. 15, connected to terminals p, q. The circuit is completed when blade spring contacts v, w are pressed into contact with one another by a spindle w operated by a spring-loaded plunger t itself operated by an arm s on the handle c. According to the Provisional Specification, the valve j may be held open by a magnet energized by a thermocouple heated by the pilot flame. The gas at the pilot burner may be ignited by a flint operated by a hand or foot operated lever. A primary pilot burner which is supplied from the inlet side of the valve j and a secondary burner supplied through the hollow plug may be provided.