Adjustable manhole cover

Details Adjustable manhole cover Adjustable manhole cover

1988-10-24

1990-03-06

Massie, Jerome W.

Road structure, process, or apparatus

Pavement

Vault cover-closure

404 25, 52 20, E02D 2914

Patent

active

049061283

ABSTRACT:
An adjustable manhole top which can be readily raised up or down in minutes to correct problems when the ground around it heaves. A cylindrical sleeve with a plurality of spaced elongated shoulders extending longitudinally along an internal surface thereof, is adjustably seated about upwardly extending projections from a support rim. A lock, removably supported on the support rim, is provided with a height adjustment mechanism to support a corresponding shoulder on the sleeve, to secure the sleeve at a desired height.

REFERENCES:
patent: 3218943 (1965-11-01), Bowman
patent: 3263580 (1966-01-01), MaeMillan
patent: 4075796 (1978-02-01), Cuozzo
patent: 4255909 (1981-03-01), Soderstrom
patent: 4281944 (1981-08-01), Bowman
patent: 4512492 (1985-04-01), Graybeal
patent: 4608787 (1986-09-01), Carlson

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