Apparatus for securing adjustable support structures for manhole

Details Apparatus for securing adjustable support structures for manhole Apparatus for securing adjustable support structures for manhole

1985-04-17

1987-09-01

Novosad, Stephen J.

Road structure, process, or apparatus

Pavement

Vault cover-closure

E02D 2914

Patent

active

046905847

ABSTRACT:
An adjustable leveling apparatus for manhole covers, grates and the like within ground and similar structures, employing an annular extension ring received within an annular base ring having an internal ring seat, the extension ring being provided with inwardly disposed rigid bar members deformable over the ring seat to securely lock the extension ring within the base ring.

REFERENCES:
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patent: 3930739 (1976-01-01), Larsson et al.
patent: 4075796 (1978-02-01), Cuozzo
patent: 4174183 (1979-11-01), Ferns
patent: 4337005 (1982-06-01), LeBaron
"Quik-Rise System" publication, Quality Water Products, Inc., South Barre, Mass., 1980.

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