Metal working – Method of mechanical manufacture – Electrical device making
Patent
1986-01-27
1987-06-09
Echols, Percy W.
Metal working
Method of mechanical manufacture
Electrical device making
156245, 156293, 156294, 264275, H01B 1904
Patent
active
046709738
ABSTRACT:
An insulating stay comprises: a central core (1) having high electrical resistance and high tensile strength; a sheath (2) of high electrical resistivity and comprising fins (3) to offer a maximum resistance path to possible surface current losses; and end fittings (4). The central core is made of resin reinforced with long, continuous fibers, and advantageously of epoxy resin reinforced with glass fibers. The sheath (2) is made of a natural or synthetic polymer, and advantageously of EPDM elastomer. The stay is manufactured by coating the central core (1) with a high viscosity glue (8) having high longitudinal resistivity, then wrapping said glue-covered core in a hollow tube (5) of raw elastomer and placing the assembly in a mold (5) where said fins (3) are formed in the sheath (2) and where the raw elastomer (5) is polymerized by vulcanization or reticulation. The stay is intended for bracing electrical installations that need to be insolated and placed at some distance from the ground.
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patent: 2268703 (1942-01-01), Dickey
patent: 2440725 (1948-05-01), Munger
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patent: 3557447 (1971-01-01), Gruber et al.
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patent: 4414429 (1983-11-01), Kaczerginski et al.
patent: 4440975 (1984-04-01), Kaczerginski et al.
DuMont Pierre
Thuries Edmond
Alsthom-Atlantique S.A.
Echols Percy W.
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