GB959765A - Improvements in electric fire lighters - Google Patents

Abstract

959,765. Mounting electric heating resistances in air blowers. SIMPLEX ELECTRIC CO. Ltd. Aug. 24, 1960 [May 29, 1959; May 7, 1960], Nos. 18296/59 and 16215/60. Heading H5H. [Also in Division F4] In an electric firelighter comprising a motor-diven blower connected to a tube containing a heating element for introduction into the fuel bed, a mounting member for the heating element either has a plurality of passages conveying air to be heated and each accommodating a longitudinally extending run of the heating element so arranged that no return lead to the inlet end of the tube is needed, or includes a passage in which a return lead is accommodated at a temperature which prevents its being overheated. As shown, Fig. 2, a sleeve 20 of ceramic material is slidably mounted within the tube 12 and a core 21 located within the sleeve by a clip 33 and a strip 22 secured in a slot in the core. The coiled coil heating element 19 is wound in a helical groove in the core 21 and is connected by a lead 23 to a return lead 25 which passes through the bore 31 of the core 21. At the rear of the tube the lead 25 is connected to a lead 30 insulated at 28a, 29a and a similarly insulated incoming lead 27 is connected to the element 19. A small amount of cooling air passes down the bore 31, the entrance to the bore being restricted by an insulating bush 32. The sleeve and core are held against axial displacement by a collar 34 screwed to the tube 12 at 35. In an alternative embodiment, a solid sleeve 36 has an even number of longitudinal passages 40, Fig. 5, each opening into a central bore 39 and containing runs 19a- 19d of the heating element. At the forward end of the tube the runs are connected by leads passing over the end of the sleeve 36. Preferred air flow rate for either embodiment is 20-30 cu. ft. per hour and the heat output of the element is 750-850 watts.