Gasket for use with manhole covers

Details Gasket for use with manhole covers Gasket for use with manhole covers

1989-01-09

1990-06-19

Shoop, Allan N.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

52 20, 220378, 277207R, 285918, 404 25, F16J 900, F16J 908

Patent

active

049347152

ABSTRACT:
An improved gasket for use with manhole covers. The gasket is of the type which is fabricated from rubber and is held in a circular groove formed in the flat cover support surface of a cast iron frame of the type which holes a manhole cover. The manhole cover fits in the frame and rests on the gasket. The improved gasket has a vertical portion which is generally rectangular which fits into the circular groove. The gasket also has a horizontal portion which extends beyond the groove and onto the flat cover support surface of the frame.

REFERENCES:
patent: 2929531 (1960-03-01), Kohlins
patent: 3063439 (1962-11-01), Kessel
patent: 3334774 (1967-04-01), Poltorak
patent: 4192520 (1980-03-01), Hasegawa
patent: 4290616 (1981-09-01), Nicholson
patent: 4819953 (1989-04-01), Joh
patent: 4828274 (1989-05-01), Stannard

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