Importance

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Abstract

A preformed transition pipe coupling is disclosed for the joining together of a generally cylindrical plastic pipe end to a generally cylindrical metal pipe end. A middle ring is provided and a first end of a length of plastic pipe is inserted into and permanently joined to the first end of the middle ring at the factory. Preferably, the length of plastic pipe is joined by securing the plastic pipe to the middle ring by compressing the plastic pipe end between the middle ring and a compression member and securing it in place by utilizing metal teeth and grooves adjacent the inner periphery or outer periphery surface of the plastic pipe. The second end of a joined plastic length of pipe is heat fused to a plastic pipe in the field. A field installed mechanical coupling is attached to a second end of the middle ring to allow for field connection of the coupling to a metal pipe without welding. The coupling includes a follower movable relative to the middle ring which, when tightened, compresses a gasket to provide a seal and collapses a lock ring onto the metal pipe to grip the surface of the pipe. A control is provided to ensure an adequate seal and an adequate grip even when installed on an anchored metal pipe.

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First Claim