Pipe joints or couplings – Nonmetal to metal – Internal member
Patent
1987-10-14
1989-11-07
Arola, Dave W.
Pipe joints or couplings
Nonmetal to metal
Internal member
285322, 285348, 285423, F16L 3318
Patent
active
048786977
ABSTRACT:
A coupling is provided for joining segments of plastic pipe. The coupling includes a body portion having an inner bore opening to an enlarged outer bore. A metal stiffener tube having a flange at one end is inserted into the bore of the body until the flange contacts an internal stop. An elastomeric gasket encircles the stiffener. A flexible spring washer encircles the stiffener and contacts the outside end of the gasket. A grip ring, comprising a frustoconical radially outer surface, an inner surface with gripping members, a segmented lateral slot, and a resilient lip around one end, encircles the stiffener so that the lip is in contact with the spring washer. A connecting nut having a frustoconical bore for mating with the outside surface of the grip ring surrounds the stiffener and engages the enlarged bore of the body. The plastic pipe is inserted into the bore and around the stiffener. Tightening of the connecting nut into the enlarged bore causes axial movement and radial compression of the grip ring around the pipe and compression of the gasket by axial force of the nut and the compressed lip of the grip ring against the flexible spring washer. The compressed gasket provides a seal between the bore of the body and the outer surface of the plastic pipe. The flexed spring washer maintains compressive force on the gasket to compensate for component and pipe tolerances and tensile stress on the pipe.
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Arola Dave W.
Dresser Industries Inc.
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