Metal working – Method of mechanical manufacture – Electrical device making
Patent
1995-04-26
1997-12-16
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
29530, 29619, 1562742, 264262, 26427218, H05B 300
Patent
active
056971435
ABSTRACT:
In the manufacture of an electrofusion coupler, a winding of an electrical resistance heating wire is wound directly around a mandrel which comprises two parts providing respective ends of the mandrel. The mandrel supports electrically conducting terminal elements by means of supporting locations on the mandrel parts which form an integral part of the mandrel. The resistance wire wound around the mandrel is connected to the electrically conducting terminal elements. Subsequently a body of thermoplastics is molded around the mandrel to form the electrofusion coupler, and thereafter the mandrel parts are extracted axially from the electrofusion coupler from opposite ends, leaving the winding and terminal elements in place in the electrofusion coupler. In a variant, a thermoplastic preform is manufactured having electrically conducting terminal plates secured thereto, the preform having an electrical resistance heating wire wound therearound and secured to said terminal plates. An outer thermoplastics jacket is then molded around the wound preform and said terminal plates, with bores being formed in said outer jacket extending to holes in the terminal plates. Subsequently electrical terminals having screw-threaded shanks are screwed into said bores and into electrical contact with said terminal plates.
REFERENCES:
patent: 1982279 (1934-11-01), Apple
patent: 3943334 (1976-03-01), Sturm
patent: 4727242 (1988-02-01), Barfield
patent: 4825534 (1989-05-01), White et al.
patent: 5163713 (1992-11-01), Brettell et al.
patent: 5229581 (1993-07-01), Boult d'Auria
Japanese Patent Abtract; Title: "Manufacture of Fusion-Bonding Joint"; 28 Mar. 1990, Publication No.: JP2022021 (Sekisui Chem Co Ltd.); Publication Date: 24 Jan. 1990.
Arbes Carl J.
Glynwed Plastics Ltd.
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