Adjustable manhole top

Details Adjustable manhole top Adjustable manhole top

1991-01-31

1993-05-18

Britts, Ramon S.

Road structure, process, or apparatus

Pavement

Vault cover-closure

E02D 2914

Patent

active

052115046

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 ribs extending longitudinally along an internal surface thereof, is adjustably seated by its ribs resting in notches at predetermined elevations on riser blocks upwardly extending from height adjustment rings resting on the support rim.

REFERENCES:
patent: 638692 (1899-12-01), Banwell
patent: 3228943 (1965-11-01), Bowman
patent: 3263580 (1966-08-01), MacMillan
patent: 3629981 (1971-12-01), McCaffery
patent: 3773428 (1973-11-01), Bowman
patent: 3930739 (1976-01-01), Larsson et al.
patent: 4075796 (1978-02-01), Cuozzo
patent: 4187647 (1980-02-01), Hall
patent: 4281944 (1981-08-01), Bowman
patent: 4512492 (1985-04-01), Graybeal
patent: 4906128 (1990-03-01), Trudel

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