Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1976-02-12
1978-01-17
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
174109, 174113R, 174124R, 219528, 219530, 219537, 219550, 338214, H05B 358
Patent
active
040694100
ABSTRACT:
A heat treating appliance coilable about steel piping for heating it before or relieving stresses in it after welding comprises an elongate reticulate sleeve of interlaced heat and oxidation wire having lengths of electrical heating cable each doubled back along itself and fixed inside and along the sleeve so as to form cable legs spaced apart in the sleeve and having terminal portions extending outside it, from respective openings near one end thereof, for connection with a current source. The sleeve has end portions extending beyond the cables therein, and each bent back upon itself into a loop, for securing the appliance in place on the structure to be heat treated. The heating cable has a central solid conductor composed of an electrical resistance alloy, which is covered by a number of braided insulating layers encased in a braided wire sheath; with the inner insulating layers being formed of interlaced refractory strands and thermally decomposable strands so that, upon the first heating of the cable, the decomposable strands burn out and leave the refractory strands in a loosened state on the conductor.
REFERENCES:
patent: 3341690 (1967-09-01), Commins
patent: 3344392 (1967-09-01), Briscoe
patent: 3393297 (1968-07-01), Hart
patent: 3454747 (1969-07-01), Hart
patent: 3694628 (1972-09-01), McGwire et al.
patent: 3774013 (1973-11-01), Keep, Jr.
Dunne Gerard F.
Johnston Albert C.
Mayewsky Volodymyr Y.
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