Covering for a ground opening

Details Covering for a ground opening Covering for a ground opening

1989-07-05

1991-05-21

Neuder, William P.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 19, E02D 2914

Patent

active

050170392

ABSTRACT:
A covering for a ground opening includes a frame in which a cover can be inserted. The frame has a recess for receiving a retaining web shaped onto the edge of the cover. A niche with a sloping bearing surface is formed in the frame at a distance from the recess. The cover has a cam. When the cover is in the closed position, a supporting wall provided on the cam formed on the cover edge rests on a bearing surface of the frame, so that, on closing the cover, the later is moved in the direction of the recess and assumes a locked position. Thus, the cover is held in a clearance-free manner in the frame.

REFERENCES:
patent: 3501874 (1970-03-01), Hahne
patent: 3663990 (1972-05-01), Shane
patent: 3977124 (1976-08-01), Oger
patent: 4015373 (1977-04-01), Boissier
patent: 4456397 (1984-06-01), Freis et al.
patent: 4499695 (1985-02-01), Oger et al.
patent: 4508469 (1985-04-01), Dumortier
patent: 4756055 (1988-06-01), Welsch et al.
patent: 4840514 (1989-06-01), Defrance et al.

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