Welding collar

Details Welding collar Welding collar

1998-11-30

1999-11-23

Walberg, Teresa

Electric heating

Heating devices

With heater-unit housing, casing, or support means

264248, H05B 358

Patent

active

059904623

ABSTRACT:
A welding collar contains a collar body of fusible plastic and a heater coil, disposed in its inside surface, which is spaced apart from a free collar end by a front zone. This welding collar is improved in that pipelines with ends which are not precisely cylindrical, and especially pipelines made from material in rolls, can be welded in a problem-free and reliable manner. The sum of the length of the front zone and the axial length of an inner zone adjoining the heater coil, with which the inserted pipe comes in contact, is at least approximately equal to the length of the heater coil. The insertion depth is greater by at least a factor of 1.4 than the inside diameter of the collar body.

REFERENCES:
patent: 4436987 (1984-03-01), Thalmann et al.
patent: 4440038 (1984-04-01), Reich et al.
patent: 4670207 (1987-06-01), Yamada et al.
patent: 4684417 (1987-08-01), Grandclement et al.
patent: 4770442 (1988-09-01), Sichler
patent: 4792374 (1988-12-01), Rianda
patent: 5252157 (1993-10-01), Inhofe, Jr.
patent: 5476562 (1995-12-01), Inhofe, Jr.

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