Covering for an opening with a cover or grating placed in a fram

Details Covering for an opening with a cover or grating placed in a fram Covering for an opening with a cover or grating placed in a fram

1988-01-29

1989-08-29

Massie, IV, Jerome W.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 20, E02D 2914

Patent

active

048611867

ABSTRACT:
A covering for an opening in road surfaces, squares or the like comprises a frame and a cover. The cover has a conical, downwardly and inwardly inclined contact surface by which the cover is supported on a bearing surface provided on a support flange of the frame. The bearing surface is also conical and inwardly inclined. At the bearing surface are provided spaced, circumferentially distributed wedge-shaped grooves, which cooperate with lugs on the cover. By means of the inwardly and downwardly inclined surfaces of the lugs and grooves, a self-centering of the cover is obtained. The centering is guided by the lugs. Thus, even in the case of high traffic loads, the cover is not moved from its position.

REFERENCES:
patent: 1859739 (1932-05-01), Keating
patent: 1992354 (1935-02-01), Coleman
patent: 2163221 (1939-06-01), Slocum
patent: 3046853 (1962-07-01), Legendre
patent: 4015373 (1977-04-01), Boissier
patent: 4174183 (1979-11-01), Ferns
patent: 4237666 (1980-12-01), Kohaut

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