Adjustable manhole cover

Details Adjustable manhole cover Adjustable manhole cover

1978-09-12

1980-04-08

Byers, Jr., Nile C.

Road structure, process, or apparatus

Pavement

Vault cover-closure

210163, E02D 2914

Patent

active

041970314

ABSTRACT:
A vertically adjustable manhole cover assembly having a fixed annular support member, and a vertically adjustable annular member supported therein. The support member is provided with sets of graduated supports symmetrically mounted on its inner surface, and the adjustable member has sets of complementary graduated teeth on its outer surface which interact with the supports to rigidly support the adjustable member at a plurality of vertical levels. Grooves are also provided on the inside surface of the support member for accepting, and interlocking with, the teeth to prevent relative rotation of the annular members. The graduated teeth of the sets may include subsets of graduated steps.

REFERENCES:
patent: 599441 (1898-02-01), Dorr
patent: 638692 (1899-12-01), Banwell
patent: 689224 (1901-12-01), Pillsbury
patent: 1517871 (1924-12-01), Thompson
patent: 1673145 (1928-06-01), Gschwind
patent: 1712267 (1929-05-01), Gschwind
patent: 3215052 (1965-11-01), Lindstad
patent: 3218942 (1965-11-01), Raquet

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