Manhole extension

Details Manhole extension Manhole extension

1975-07-10

1977-06-14

Stein, Mervin

Road structure, process, or apparatus

Pavement

Vault cover-closure

49477, 277 343, E02D 2914

Patent

active

040294250

ABSTRACT:
This invention relates to an improved manhole extension or shield of the type constituting the subject matter of my U.S. Pat. No. 3,294,000 which improvement comprises providing at least one, and preferably both of the outwardly-facing channels with a circular fence projecting down into the casting bordering the mouth of the manhole so as to bridge any gap left between the latter and the annular flange from which it depends thus cooperating with said casting to retain the inflatable gasket.

REFERENCES:
patent: 794987 (1905-07-01), Kneuper
patent: 2369823 (1945-02-01), Freed
patent: 2488796 (1949-11-01), Baier
patent: 3142234 (1964-07-01), Maloon
patent: 3161229 (1964-12-01), Sanders
patent: 3294000 (1966-12-01), Pelsue
patent: 3444793 (1969-05-01), Pelsue

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