초록 ▼

A socket for joining the ends of conduits, pipe or the like comprising a body of thermoplastic material in which is embedded, in a helical coil, a resistance wire strand formed of a plurality of juxtaposed individual thin wire elements, the wire elements being in part spaced from one another, to for

A socket for joining the ends of conduits, pipe or the like comprising a body of thermoplastic material in which is embedded, in a helical coil, a resistance wire strand formed of a plurality of juxtaposed individual thin wire elements, the wire elements being in part spaced from one another, to form gaps allowing for expansion of or movement of the wire elements without overall expansion or movement of the strand.

대표청구항 ▼

An electrically weldable socket for connecting conduit elements comprising a cylindrical body formed of thermoplastic material capable of shrinking on being heated, and a helically coiled resistance wire, said wire comprising a plurality of individual thin wire strand elements, said wire strand elem

An electrically weldable socket for connecting conduit elements comprising a cylindrical body formed of thermoplastic material capable of shrinking on being heated, and a helically coiled resistance wire, said wire comprising a plurality of individual thin wire strand elements, said wire strand elements being arranged in said wire to provide gaps between the wire strand elements, said wire being embedded in the wall of said body and extending along the length thereof coaxial with the central axis in proximity to the inner surface of the wall of said body, and having terminal ends extending outward of said body for contact with a source of current, said wire strand elements when heated expanding relative to each other into the gaps therebetween without overall radial or axial enlargement of said helically coiled wire.