Compression coupling for plastic pipe

Claim 1

A self-contained compression coupling for connecting standardized outer diameter sized pipe to standardized flare ball joint end connectors comprising: a housing having a cylindrical wall which defines a chamber and at the rear of said chamber an internal annular rear shoulder means defining the front margin of a bore which is adapted to receive a hollow connector having a nose surface, and internal annular front shoulder means at the forward end of said housing defining the rear margin of a pipe receiving opening; a rubber compression ring in the housing intermediate said rear and front shoulder means; means forming a wedging surface at the forward end of said housing facing said compression ring; and compressor means slidable forwardly in the housing to force the compression ring against said wedging surface, said compressor means including an annular spacer collar which has a forwardly facing wedging surface abutting the ring, and a rigid sleeve concentrically within the ring and the collar and defining therewith an annular cavity that receives the end portion of a pipe inserted through said opening, said sleeve having an external end flange which normally bears against the rear shoulder and is operatively associated with the spacer collar, said sleeve flange having a rear surface which is engaged by the connector nose surface as the housing moves endwise onto the connector to move the sleeve and collar forwardly and thereby compress the rubber ring between the wedging surfaces to squeeze it radially inwardly to clamp such ring against the pipe in a sealed relationship, coupling to the outer surface of the pipe.