Electro-welding sleeve fabrication method, device for implementi

Details Electro-welding sleeve fabrication method, device for implementi Electro-welding sleeve fabrication method, device for implementi

1990-06-04

1992-08-18

Reynolds, Bruce A.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

26427211, 26427215, 26427218, 219544, 219548, H05B 306, B29C 6534

Patent

active

051401371

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: 4266997 (1981-05-01), Lippera
patent: 4530520 (1985-07-01), Nyffeler et al.

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