Manhole system

Details Manhole system Manhole system

2008-01-10

2010-06-01

Addie, Raymond W (Department: 3671)

Road structure, process, or apparatus

Pavement

Vault cover-closure

C052S019000

Reexamination Certificate

active

07726903

ABSTRACT:
A manhole system that includes a manhole cover and a frame with at least one locking device for maintaining the manhole cover in place on the frame. The locking device is selectively movable between locked and unlocked positions to selectively engage the cover to hold the cover in place on the frame. The locking device may be rotatable between “locked” and “unlocked” positions about an axis perpendicular to the plane of the cover. The locking device may includes a plurality of cam locks that engage the outer circumferential edge of the cover and are configured to increasingly clamp down the cover against the frame with increasing rotation from “unlocked” position to “locked” position. A plurality of locks can be arranged around frame to engage the cover at different locations.

REFERENCES:
patent: 1158875 (1915-11-01), Warman
patent: 1226766 (1917-05-01), Gammeter
patent: 3425313 (1969-02-01), Villo
patent: 3858998 (1975-01-01), Larsson et al.
patent: 4145151 (1979-03-01), Helms
patent: 4279356 (1981-07-01), Amorese et al.
patent: 4607760 (1986-08-01), Roche
patent: 5394650 (1995-03-01), Dean
patent: 6371687 (2002-04-01), Heintz et al.
patent: 7537413 (2009-05-01), Brugos

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