Universal stackable manhole shield

Details Universal stackable manhole shield Universal stackable manhole shield

1990-06-25

1991-09-10

Novosad, Stephen J.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 20, 49477, E02D 2914

Patent

active

050468863

ABSTRACT:
An improved extension shield for a manhole is disclosed. The shield seals around an open manhole frame protecting the instruments and men working inside from rain, snow, surface water and other elements. The shield is adapted to be installed in four differently sized openings and is constructed to preferably seal inside the lip of the manhole frame rather than on top of the lip. The shield is made of a durable molded plastic material and is stackable to create higher shields or for storage.

REFERENCES:
patent: 2431082 (1947-11-01), Sayles
patent: 2559564 (1951-07-01), Sperling
patent: 2593918 (1952-04-01), Redman
patent: 3142234 (1964-07-01), Maloon
patent: 3294000 (1966-12-01), Pelsue
patent: 3349950 (1967-10-01), Wanderer
patent: 4029425 (1977-06-01), Pelsue
patent: 4188151 (1980-02-01), Hall
patent: 4640434 (1987-02-01), Johnsen et al.

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