Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1998-03-30
1999-11-30
Pezzuto, Robert E.
Road structure, process, or apparatus
Pavement
Vault cover-closure
404 25, 254264, 212901, E02D 2914, B66D 100
Patent
active
059931060
ABSTRACT:
A restrainable manhole, handhole cover and open/close device therewith provides vertical pads at predetermined positions along a bottom edge of a manhole/handhole cover, which are integrally molded with a cover body. This forms an inclined a third edge which is longer than an inner diameter of a manhole/handhole neck such that it can prevent the cover body to bounce up and displace when being overlaid by a vehicle. Furthermore, a plurality of pre-molded flat plates are provided on predetermined locations perpendicular to the neck. A pre-punched hole is provided for each flat plate for accepting the vertical pad of the cover body for restraining the cover body in its position at the same time the cover body is overlaid by a vehicle.
REFERENCES:
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patent: 4861186 (1989-08-01), Ferns
patent: 5454625 (1995-10-01), Christensen et al.
patent: 5458435 (1995-10-01), Kohno
patent: 5462385 (1995-10-01), Mohlengraft
Chan Raymond Y.
Harsmann Gary S.
Pezzuto Robert E.
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