Swing-out manhole cover

Details Swing-out manhole cover Swing-out manhole cover

2007-11-27

2010-11-16

Hartmann, Gary S (Department: 3671)

Road structure, process, or apparatus

Pavement

Vault cover-closure

Reexamination Certificate

active

07832958

ABSTRACT:
A swing-out manhole cover assembly having at least one ramp to facilitate opening and closing the cover. The manhole cover assembly includes a frame, a cover, a swing assembly and at least one ramp. As the cover swings open away from the frame about the swing assembly, the ramp imparts linear translation to the cover separating the cover from the frame slightly. As the cover swings back to close the manhole cover, the ramp reverses the linear translation and the cover returns back to the frame. A spring may be included to bias the cover in the closed position.

REFERENCES:
patent: 1225679 (1917-05-01), Ransehousen
patent: 1314306 (1919-08-01), Cullison
patent: 2439978 (1948-04-01), Konchan
patent: 3262227 (1966-07-01), Pentecost
patent: 4015373 (1977-04-01), Boissier
patent: 4456397 (1984-06-01), Freis et al.
patent: 5531541 (1996-07-01), Clover et al.
patent: 7341398 (2008-03-01), Johnson et al.
patent: 7695213 (2010-04-01), Akkala et al.
patent: 2008/0138153 (2008-06-01), Johnson et al.

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