Profiled sheathed wire for forming into an electric resistance w

Details Profiled sheathed wire for forming into an electric resistance w Profiled sheathed wire for forming into an electric resistance w

1990-06-04

1992-04-21

Reynolds, Bruce A.

Electric heating

Heating devices

With heating unit structure

219535, 219544, 219549, H05B 358

Patent

active

051070987

ABSTRACT:
A wire-form element consists of at least one resistive wire coated with a thermoplastic material. The coating features mechanical fixing parts one of which is designed to cooperate with the other fixing part of an adjacent identical wire-form element to be joined to it. The wire form element further comprises a second heating wire tangential to the contacting surface of the wire form element to be joined to it. This second heating wire is used to stiffen the connector or the insert obtained by welding together the joined wire-form element sections. The wire-form element is particularly intended for the manufacture of electric resistance welding inserts. In the case of inserts intended for a welding sleeve for jointing tubular thermoplastics material parts it is preferably formed into a helical winding. In the case of inserts intended for making a branch connection to a tubular plastics material part by making a hole therein it may be formed into a flat spiral.

REFERENCES:
patent: 3378672 (1968-04-01), Blumenkranz
patent: 3679531 (1972-07-01), Wienand et al.
patent: 4436988 (1984-03-01), Blumenkranz
patent: 4894521 (1990-01-01), Evans
Patent Abstracts of Japan, vol. 8, No. 154, Jul. 18, 1984, JP-A-59 49 945 (Sanyo Denki).

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