The Lamson & Sessions Co.

Michael D Bank

Michael R Miller

Thomas W Hawkins

A pipe joint is disclosed, along with a pipe for use with such a joint. The pipe has a double wall construction with support ribs connecting the two walls of the pipe. The pipe also includes at least one end wall having a routed groove formed therein, wherein the groove is dimensioned to receive a coupling member. A locking entrance lip is formed within the groove. The pipe joint includes two pipe sections and a coupling member that is received into the respective grooves of each pipe section and is locked into place by the locking entrance lips. The joint is fluid tight, locks the pipe sections in place, and is smooth on both the interior and exterior surfaces of the two connected pipes. In addition, the disclosed pipe joint construction is very easy to assemble, and is particularly suited for use in sewer relining operations.

Pipe joint and pipe for use therewith

A coupling member includes a ring is formed with a predetermined draft angle. A gasket is provided for creating a seal between the ring and the end grooves of the conduit. The gasket comprises first and second walls which define an interior cavity for receiving the ring. The first and second walls have differential thicknesses so as to accommodate the draft angle of the ring. A plurality of fins are formed integrally on the exterior of the gasket for creating an interference fit with the end grooves. In the preferred embodiment, the first wall is substantially thicker than the second wall and the fins exterior to the first wall are thicker than the fins on the second wall. Also, the thicknesses of the first and second walls are preferably tapered so as to define an interior cavity having a draft angle equal to that of the ring.

Draft compensating coupling member

A force-transmitting joint formed between two pipe sections is provided that is particularly suited for an extruded, plastic pipe having a variable wall thickness. The joint has a smooth outer surface and a constant gap in which a sealing member is retained. The pipe section has an outer wall including an outer surface and an inner surface with a variable wall thickness defined therebetween. A first end of the pipe section includes a first joint member comprising a first support surface having a constant width. The first joint member further comprises an outwardly extending sealing leg having a variable width. A second end of the pipe includes a second joint member comprising a second support surface having a constant width which is less than the width of the first support surface. The second joint member further comprises a recess having a variable thickness. An annular sealing member is assembled onto the sealing leg. When the first joint member of one pipe section is joined to the second joint member of another pipe section, the first support wall and second support wall align in a force-transmitting relationship, the sealing leg is at least partially received in the recess and a constant-width gap is formed between a wall of the recess and the sealing leg. The sealing member is retained in the constant-width gap.

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South Euclid, OH, United States of America

Michael D Bank