Manhole frame with adjustment screws

Details Manhole frame with adjustment screws Manhole frame with adjustment screws

1974-04-18

1976-01-06

Stein, Mervin

Road structure, process, or apparatus

Pavement

Vault cover-closure

404 25, E02D 2914

Patent

active

039307395

ABSTRACT:
A manhole frame with adjustment screws for raising and lowering said frame has in its inner surface pockets or recesses each communicating with a hole for guiding of the adjustment screws. The recesses serve to receive nuts for the screws and the recesses are shaped so as to permit the sideways of said nuts. The recesses also constitute drainages for the screw holes.

REFERENCES:
patent: 1076386 (1913-10-01), O'Day
patent: 2930295 (1960-03-01), Hale
patent: 3263579 (1966-08-01), Dorris
patent: 3773428 (1973-11-01), Bowman

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