Concrete manhole

Details Concrete manhole Concrete manhole

1978-03-23

1986-06-03

Leppink, James A.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 20, 277207A, E02D 2911

Patent

active

045926743

ABSTRACT:
A manhole barrel is cast with an annular gasket in place in the barrel form. The form has a frusto-conical pallet section grooved for receiving the gasket. Anchors protruding from the gasket become embedded in concrete when the latter is introduced into the form.

REFERENCES:
patent: 2219289 (1940-10-01), Bennett
patent: 2982569 (1961-05-01), Miller
patent: 2999699 (1961-09-01), Lafferty
patent: 3135519 (1964-06-01), Ligon
patent: 3759280 (1973-09-01), Swanson
patent: 3759285 (1973-09-01), Yoakum
patent: 3787061 (1974-01-01), Yoakum
patent: 3829107 (1974-08-01), Machado
patent: 3891224 (1975-06-01), Ditcher
patent: 3913928 (1975-10-01), Yamaguchi
patent: 3938285 (1976-02-01), Gilbu

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