Device for raising level of manhole cover

Details Device for raising level of manhole cover Device for raising level of manhole cover

1990-04-02

1990-12-11

Kisliuk, Bruce M.

Road structure, process, or apparatus

Pavement

Vault cover-closure

404 25, 52 20, E02D 2914

Patent

active

049765680

ABSTRACT:
This invention relates to a spacer for a manhole cover for use in a manhole frame comprising a ring having a mounting surface adapted to sit on the top of a manhole cover frame. The ring has a seating surface for, in use, the seating of a manhole cover thereon. The seating surface is spaced radially inwardly of the mounting surface. The ring has a downwardly extending portion below the seating surface. The downwardly extending portion has a lesser outside diameter than the portion above said seating surface to enter into the manhole cover frame in use.

REFERENCES:
patent: 2431082 (1947-11-01), Sayles
patent: 2593918 (1952-04-01), Redman
patent: 4038789 (1977-08-01), Axgarde
patent: 4187647 (1980-02-01), Hall
The 3 Minute Lift Ring by the Hopper Foundry (1987) Limited.

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