Vertically adjustable manhole adjusting ring section

Details Vertically adjustable manhole adjusting ring section Vertically adjustable manhole adjusting ring section

1991-09-24

1993-06-22

Britts, Ramon S.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 21, E02D 2914, E06B 104

Patent

active

052211550

ABSTRACT:
A manhole adjusting ring includes ring sections each having a vertically disposed connecting plate which is selected from an inventory of different sized connecting plates to interconnect an outer ring portion to an inner ring portion. The resulting adjusting ring section will compliment the dimensions of the manhole casting including the distance from the top peripheral edge to the casting ledge on the inner wall.

REFERENCES:
patent: 2109287 (1938-02-01), Elkington
patent: 2254668 (1941-09-01), Tomek
patent: 3218943 (1965-11-01), Bowman
patent: 3294000 (1966-12-01), Pelsue
patent: 3773428 (1973-11-01), Bowman
patent: 4187647 (1980-02-01), Hall
patent: 4188151 (1980-02-01), Hall
patent: 4281944 (1981-08-01), Bowman
patent: 4582450 (1986-04-01), Neil
patent: 4690584 (1987-09-01), LeBaron
patent: 4976568 (1990-12-01), Hess
patent: 4995757 (1991-02-01), Prescott
patent: 5078539 (1992-01-01), Claing

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