Covering for a ground opening

Details Covering for a ground opening Covering for a ground opening

E - Fixed Constructions

02

D

94/12, 20/50

E02D 29/14 (2006.01)

Patent

CA 1305598

ABSTRACT OF THE DISCLOSURE A covering comprises 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 portions 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.

583035

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