Locking device for coverings for manholes and other ground openi

Details Locking device for coverings for manholes and other ground openi Locking device for coverings for manholes and other ground openi

1990-04-23

1991-10-15

Britts, Ramon S.

Road structure, process, or apparatus

Pavement

Vault cover-closure

404 26, 292 91, E02D 2914

Patent

active

050569554

ABSTRACT:
A locking device for a covering comprised of a frame and a cover includes arms, which are inserted in depressions or bores formed in the frame and/or cover, whereby they undergo elastic deformation and consequently form a frictional engagement with the cover. The free end each of the arms project beyond an inner flange of the frame and form there a positive connection between the arms and the inner flange. This results in a simple, but effective connection between the cover and the frame, without requiring machining of the arms or depressions.

REFERENCES:
patent: 887591 (1908-05-01), Cook
patent: 897046 (1908-08-01), Armstrong
patent: 1516514 (1924-11-01), Tueckmantel
patent: 2133789 (1938-10-01), Pool
patent: 2134828 (1938-11-01), Kaplan
patent: 2693100 (1954-11-01), Wiegel
patent: 3120971 (1964-02-01), Bengtsson
patent: 3921494 (1975-11-01), Coe
patent: 4075796 (1978-02-01), Cuozzo
patent: 4254647 (1981-03-01), Finck, Jr.
patent: 4354298 (1982-10-01), Tanaka et al.
patent: 4544191 (1985-10-01), Nakama
patent: 4592579 (1986-06-01), Burnett

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