Static structures (e.g. – buildings) – With entrance for persons or objects in horizontal or... – With additional enclosure structure; e.g. – manhole
Patent
1988-11-02
1989-10-17
Scherbel, David A.
Static structures (e.g., buildings)
With entrance for persons or objects in horizontal or...
With additional enclosure structure; e.g., manhole
220352, 404 25, E02D 2914
Patent
active
048737950
ABSTRACT:
A covering includes a cover and a frame into which the cover is inserted. A supporting surface of the cover and a cooperating bearing surface of the frame each have a surface inclined with respect to the cover plane. These surfaces are partial peripheral surfaces of a sloping cylinder and/or a sloping cone bounded by sections. As a result the partial surfaces have along their circumferences a different inclination with respect to the cover plane. Therefore the cover can only be inserted in the frame in a specific position. Since as a result of this the same surface positions of the cover and the frame always rest on one another, in the case of such coverings a tight closure can be achieved with a circular or oval opening.
REFERENCES:
patent: 2100127 (1937-11-01), Bonsall
patent: 2100128 (1937-11-01), West
patent: 4662777 (1987-05-01), Newton
Galvanetto Francois
Spiess Hansruedi
Scherbel David A.
Von Roll AG.
Williams Anthony W.
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