Welding sleeve of thermoplastic material

Details Welding sleeve of thermoplastic material Welding sleeve of thermoplastic material

1994-09-21

1996-07-02

Walberg, Teresa J.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

219544, 285 22, 285292, H05B 358, F16L 1302

Patent

active

055324592

ABSTRACT:
The welding sleeve has a coil of a resistance wire forming two heating zones and is arranged near the inner circumference of the sleeve. Each heating zone has a region at the beginning and end in which the coil spacing is less than in the center region.

REFERENCES:
patent: 3943334 (1976-03-01), Sturm
patent: 4147926 (1979-04-01), Stahli
patent: 4375591 (1983-03-01), Sturm
patent: 4634844 (1987-01-01), Lodder
patent: 4931116 (1990-06-01), Rosenzweig
patent: 5255943 (1993-10-01), Keller et al.

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