Electric heating – Heating devices – With heating unit structure
Patent
1980-01-02
1982-01-26
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heating unit structure
156272, 1563809, 219535, 26427219, 285 21, H05B 358
Patent
active
043130534
ABSTRACT:
A sleeve member (4) formed from a pipe length by expansion is placed over a mandrel onto which are wound the spaced turns (7) of a resistance heating wire (6). By heating sleeve member (4) the latter is shrunk onto the turns (7). By electrically producing heat in wire (6) material flows around the expanding turns (7) and embed the latter completely in sleeve member (4), projecting material portions (8, 9) being formed in the vicinity of turns (7). Thus, a protection against electric shock hazard is obtained for turns (7) and after-working is made unnecessary for the standing back edge portions of inner wall (5) which deform inwards during manufacture.
REFERENCES:
patent: 2223434 (1940-12-01), Trickey
patent: 3094452 (1963-06-01), von Riegen et al.
patent: 3422179 (1969-01-01), Bauer et al.
patent: 3943334 (1976-03-01), Sturm
patent: 3954541 (1976-05-01), Landgraf
patent: 4117311 (1978-09-01), Sturm
patent: 4147926 (1979-04-01), Stahli
patent: 4176274 (1979-11-01), Lippera
patent: 4224505 (1980-09-01), Sturm
Mayewsky Volodymyr Y.
Von Roll A.G.
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