Manhole rim and cover assembly

Details Manhole rim and cover assembly Manhole rim and cover assembly

1991-10-11

1993-04-13

Scherbel, David A.

Static structures (e.g., buildings)

With entrance for persons or objects in horizontal or...

With additional enclosure structure; e.g., manhole

52 21, 404 25, 404 26, E02D 2914

Patent

active

052011518

ABSTRACT:
A manhole rim and cover assembly includes a rim formed with an annular upwardly projecting lip extending around its central opening with a shoulder projecting radially inwardly from the lip at a location spaced below its upper edge. A cover has circumferentially spaced circumferential segments projecting downwardly from its lower surface to fit within the inner side of the lip and to rest upon the shoulder referred to above to prevent crushing of a sealing gasket received between the bottom of the cover and the upper edge of the lip. Vent openings are formed through the lip to vent the manhole when the cover is in place. Spring clips on the cover engage an undercut shoulder on the rim to releasably retain the cover against removal from the rim.

REFERENCES:
patent: 4187647 (1980-02-01), Hall
patent: 4188151 (1980-02-01), Hall
patent: 4532915 (1985-08-01), de Rham
patent: 4593714 (1986-06-01), Madden
patent: 4662777 (1987-05-01), Newton
patent: 4762440 (1988-08-01), Argandona
patent: 4763449 (1988-08-01), Vigneron et al.
patent: 4793387 (1988-12-01), LeBlanc et al.
patent: 4896705 (1990-01-01), Podgers et al.
patent: 4973191 (1990-11-01), Dannhauser

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