Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1985-11-05
1986-07-08
Ward, Robert S.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277166, 277152, 277DIG2, 285230, 285345, F16J 1510, F16J 1532, F16L 2102
Patent
active
045989150
ABSTRACT:
An annular gasket is provided to provide a leak proof seal between the surface of an opening through the wall of a manhole and the outer surface of a pipe which passes through said opening. The gasket is made of elastomeric material and has a cross-section defining a radially outward T-shape portion embedded in the concrete of the manhole wall around the opening. The gasket further includes a radially inner enlargement tapering radially inwardly and terminated by a laterally directed lip. The enlargement and lip are flexed by the pipe inserted through the opening with the maximum thickness of the enlargement forming a sealing ridge contacting the pipe in a first zone and with the lip also contacting the pipe in a second zone with a void between the first and second zones. The surface of the manhole opening has a channel for receiving the anchoring part of the gasket and on each side of the channel two frusto-conical surface portions of different minimum diameter; the frusto-conical surface portion of lesser minimum diameter being disposed on the side of the lip and acting as a solid stop for the pipe when subjected to abnormally high shearing force so that the portion of the gasket diametrically opposite said stop will not disengage the pipe.
REFERENCES:
patent: 3315971 (1967-04-01), Sakurada
patent: 3787061 (1974-01-01), Yoakum
patent: 4143884 (1979-03-01), Nicholas et al.
patent: 4159829 (1979-07-01), Ditcher
patent: 4342462 (1982-08-01), Carlesimo
patent: 4350351 (1982-09-01), Martin
patent: 4508355 (1985-04-01), Ditcher
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