Quick opening manhole cover assembly

Details Quick opening manhole cover assembly Quick opening manhole cover assembly

1979-11-01

1981-07-21

Byers, Jr., Nile C.

Receptacles

Closures

Crossbar carries closure and serves as closure fastener

49465, 404 25, B65D 4528

Patent

active

042793564

ABSTRACT:
A quick opening manhole cover including a clamping flange (16) which captures the ears (48) of a locking ring (46) upon rotation of the locking ring with respect to a manhole cover (40). The manhole cover has an O.D. less than the I.D. of the manhole for axial movement into the manhole. A gasket (42) about the manhole cover is clamped between the locking ring (46), manhole cover (40) and against the manhole surface upon axial movement of the manhole cover towards the locking ring.

REFERENCES:
patent: 1324981 (1919-12-01), Roesch
patent: 1473408 (1923-11-01), Richardson
patent: 2335309 (1943-11-01), Pfleumer
patent: 2488524 (1949-11-01), Castellano
patent: 2891694 (1959-06-01), Ackley
patent: 2991904 (1961-07-01), Carideo
patent: 3386612 (1968-06-01), Kirkwood
patent: 3916800 (1975-11-01), Hutchison
patent: 4175781 (1979-11-01), Dumortier

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