Air conduit for manhole

Details Air conduit for manhole Air conduit for manhole

1987-07-10

1989-01-03

Schroeder, Werner H.

Pipes and tubular conduits

With flow regulators and/or baffles

Flow facilitating

138106, F15D 104

Patent

active

047949562

ABSTRACT:
Air ventilation conduit for passing through manhole the conduit having a central section with a cross section having the shape of a crescent or a segment of a circle where it passes through the manhole to provide a minimum of obstruction for men and equipment passing through the manhole, cylindrical outer sections of the conduit for connection to flexible hose, and intermediate sections of varying cross section to connect the central section to the cylindrical outer sections offset away from the manhole.

REFERENCES:
patent: 396773 (1889-01-01), Smith
patent: 1191621 (1916-07-01), Schmidt
patent: 1782779 (1930-11-01), Fullman
patent: 2056782 (1936-10-01), Fosdick
patent: 2364144 (1944-12-01), Hunsaker
patent: 3093056 (1963-07-01), Rosenfeld
patent: 3610524 (1971-10-01), Wallen
patent: 3757664 (1973-09-01), Jalbert
patent: 3894302 (1975-07-01), Lasater
patent: 4023833 (1977-05-01), Wellard
patent: 4285269 (1981-08-01), Pelsue et al.
patent: 4463779 (1984-08-01), Wink et al.

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