Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1992-05-21
1994-10-18
Reynolds, Bruce A.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
219544, 219548, 26427211, 26427215, 26427218, H05B 306, B29C 6534
Patent
active
053570839
ABSTRACT:
In a method of manufacturing a plastics material sleeve fitted with a heating wire and intended for producing an electric resistance welding connector the sleeve is molded to a cylindrical shape delimited by an outside surface and an inside surface; a helical groove is formed in one of these two surfaces of the sleeve; a wire is placed in the groove; and the plastics material heated by means of the wire is smoothed so as to cover the wire totally and close the groove. The electric resistance welding sleeve obtained in this way is in particular intended to be used either without overmolding it as an ordinary sleeve in particular for welding water pipes or after overmolding it as an electric resistance welding connector in particular for gas pipes.
REFERENCES:
patent: 4117311 (1978-09-01), Sturm
patent: 4266997 (1981-05-01), Lippera
patent: 4530520 (1985-07-01), Nyffeler et al.
patent: 4684417 (1987-08-01), Grandclement
patent: 4703150 (1987-10-01), Kunnecke
patent: 5086213 (1992-02-01), Nussbaum
Boulet d'Auria, Terlizzi & Cie
Gaz de France
Reynolds Bruce A.
Switzer Michael D.
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