Watertight manhole insert

Details Watertight manhole insert Watertight manhole insert

1985-05-28

1987-03-17

Novosad, Stephen J.

Road structure, process, or apparatus

Pavement

Vault cover-closure

404 4, 404 26, E02D 2914

Patent

active

046503650

ABSTRACT:
A watertight manhole insert is provided for preventing rainwater from entering a sanitary sewer system through manhole covers. The insert includes a shallow, dish-shaped body and a mounting flange designed to rest upon the supporting flange of a manhole frame. A recess is formed in the bottom of the body portion and includes a valve for releasing pressure which builds up beneath said insert. The valve is shielded such that it will not be struck by a manhole cover sliding across said insert. Additionally, the valve can be used as a handle to remove the insert from a manhole.

REFERENCES:
patent: 3712009 (1973-01-01), Campagna
patent: 3798848 (1974-03-01), Campagna
patent: 3969847 (1976-07-01), Campagna et al.
patent: 3973856 (1976-08-01), Gaglioti
patent: 4030851 (1977-06-01), Graybeal
patent: 4067659 (1978-01-01), Campagna et al.
Advertising brochure of FRW Industries, Inc. of Conroe, Texas for an Inflow Protector-Cover.TM..

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