Method of making a pipe joint seal with bistable elastomeric sea

Details Method of making a pipe joint seal with bistable elastomeric sea Method of making a pipe joint seal with bistable elastomeric sea

1988-10-24

1990-04-17

Thurlow, Jeffery

Metal working

Method of mechanical manufacture

Assembling or joining

29458, 156122, 156217, 15624425, 264 35, 2641771, 26417717, 264229, 264274, 264279, 264295, 264296, B23P 1100, B29C 4120, B29C 5302, B29C 6570

Patent

active

049167995

ABSTRACT:
A 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: 3727876 (1973-04-01), Keyser
patent: 3759285 (1973-09-01), Yoakum
patent: 3787061 (1974-01-01), Yoakum
patent: 3832438 (1974-08-01), Ditcher
patent: 3874063 (1975-04-01), Skinner et al.
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
patent: 4834428 (1989-05-01), Pritchatt
patent: 4842785 (1989-06-01), Daigle et al.

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