Pipe joint seal with bistable elastomeric sealing projection

Details Pipe joint seal with bistable elastomeric sealing projection Pipe joint seal with bistable elastomeric sealing projection

1986-10-16

1989-03-07

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 9, 277 343, F16J 1532, F16J 1510

Patent

active

048099945

ABSTRACT:
A gasket system for providing a fluidtight joint between a manhole riser and a sewer pipe. The gasket is formed with a mounting portion which is generally cylindrical, and provides an anchoring projection extending radially from the outer side thereof. A sealing projection is joined to the mounting portion by a hinge section. The sealing projection is placed in compression when the gasket is formed into a circle, and becomes bistable. In one position of stability, the sealing projection is substantially aligned with the mounting portion, and in the other position of stability, the sealing projection is located generally within the mounting portion. The gasket is positioned around a core, with the sealing projection aligned with the mounting portion, and is cast into an opening provided by the material of the manhole riser. In such position, the sealing projection is partially embedded within the material of the riser. Prior to installation of a sewer pipe, the sealing projection is manually released from the material of the riser and is pushed through to its other position of stability. When a sewer pipe is pressed through the gasket, the sealing projection provides substantial compression with the outer surface of the sewer pipe and a good fluidtight joint.

REFERENCES:
patent: 3510140 (1970-05-01), Hermann
patent: 3759285 (1973-09-01), Yoakum
patent: 3787061 (1974-01-01), Yoakum
patent: 3879067 (1975-04-01), Keyser
patent: 4073048 (1978-02-01), Ditcher
patent: 4084827 (1978-04-01), Wolf
patent: 4103901 (1978-08-01), Ditcher
patent: 4159829 (1979-07-01), Ditcher
patent: 4350351 (1982-09-01), Martin

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