Electric heating – Heating devices – With heater-unit housing – casing – or support means
Patent
1977-04-20
1979-11-27
Envall, Jr., Roy N.
Electric heating
Heating devices
With heater-unit housing, casing, or support means
156275, 264272, 219544, 219535, H05B 358
Patent
active
041762746
ABSTRACT:
The coupling of two tubular elements is achieved by welding them together by energization of an electrical resistance element, the one element comprising a male end, the other a socket end. The coupling operation is carried out by means of a composite connecting piece comprising two rings which are fitted on one another, one acting as a support for a bifilar electrical resistance element and the other as a sheath. The electrical resistance element is thus uniformly coated in plastic material and is accurately centered, thereby ensuring uniform heating and welding. This coupling method is for use in coupling discharge pipelines for waste water and rain water and for conduits for industrial fluids.
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patent: 3061503 (1962-10-01), Gould et al.
patent: 3062940 (1962-11-01), Bauer et al.
patent: 3094452 (1963-06-01), Von Riegen et al.
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patent: 3788928 (1974-01-01), Wise
patent: 3849630 (1974-11-01), Halliday
patent: 3943334 (1976-03-01), Sturm
patent: 3987276 (1976-10-01), Vogelsanger et al.
patent: 4090899 (1978-05-01), Reich
Envall Jr. Roy N.
Paschall M.
Pont-A-Mousson S.A.
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