ELECTROFUSION FITTING

摘要

A moulded electrofusion fitting (10) for connection to a plastics pipeline, comprises a hollow body (16) formed with a tubular opening that has a longitudinal axis (82) and is adapted to receive an end of the pipeline as a close sliding fit. An electrofusion element (22) is formed in the internal surface (52c) in the opening, spaced from its end (52b). Fingers (52) are on the end of the opening, circumferentially spaced around the opening and separated by slots (53) between them. Cam surfaces in the form of ribs (60) are defined on the fingers, and a grip ring (50) is received on the fingers and includes wedge elements in the form of grooves (62). These are adapted to fit the ribs so that, when a pipeline is inserted in the opening and the grip ring is rotated about said axis, the ribs and grooves engage to press the fingers radially inwardly against the reaction of the grip ring whereby, said pipe is gripped by said grip ring and centralised in the opening. The grip ring may be integrated with a terminal pin (24), a bayonet slot (106) of the grip ring accommodating the terminal pin, a shroud boss (27') formed on the grip ring around the base of the bayonet slot.