Frame for a covering for an opening protected by a cover or grat

Details Frame for a covering for an opening protected by a cover or grat Frame for a covering for an opening protected by a cover or grat

1988-01-29

1990-06-26

Novosad, Stephen J.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 20, E02D 2914

Patent

active

049367030

ABSTRACT:
A frame for a manhole comprises a cylindrical pipe portion and an outwardly projecting lateral flange portion located on the outside of the pipe portion. Projections are provided on the inside of the portion and on these can be supported a cover or grating. The flange portion is constructed as a cohesive collar, which projects substantially horizontally outwards. The flange portion is located at a height below the upper border of the pipe portion. This height is a third to a half of the total height of the pipe portion. Due to the fact that the flange portion is spaced from the upper end of the pipe portion, during the installation of the frame, it is surrounded at all sides by the material of the ground surface, so that the frame is connected in stable manner to the ground material and cannot be significantly displaced by the traffic flow.

REFERENCES:
patent: Re8871 (1879-08-01), Graham
patent: 3217619 (1965-11-01), Driver et al.
patent: 3294000 (1966-12-01), Pelsue
patent: 3611889 (1971-10-01), Levinson
patent: 4029425 (1977-06-01), Pelsue
patent: 4143988 (1979-03-01), Arment
patent: 4475844 (1984-10-01), Arntyr et al.
patent: 4544302 (1985-10-01), Farrelly
patent: 4592674 (1986-06-01), Baliva
patent: 4737220 (1988-04-01), Ditcher et al.

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