Closure device

Details Closure device Closure device

2007-01-09

2007-01-09

Hartmann, Gary S. (Department: 3671)

Road structure, process, or apparatus

Pavement

Vault cover-closure

Reexamination Certificate

active

11277805

ABSTRACT:
A fixed frame (4) and a covering element (6), the frame (4) defining a frame plane (P—P). A first latch (30) has two latch surfaces (32, 34) which cooperate and which are inclined relative to the frame plane (P—P). The covering element (6) and the frame (4) comprise cooperating stop surfaces (52, 56) which limit a displacement of the lid (6) within the frame (4) in the frame plane (P—P). The stop surfaces (52, 56) are inclined relative to the frame plane (P—P) by an angle of from 30° to 80° and they maintain the covering element flat on the frame. Application to manhole covers for closing manholes.

REFERENCES:
patent: 1923481 (1933-08-01), Ford
patent: 3744670 (1973-07-01), De Frees
patent: 4114236 (1978-09-01), Vandervort
patent: 5366317 (1994-11-01), Solimar
patent: 6446307 (2002-09-01), Wilkins
patent: 7033489 (2006-04-01), Thompson et al.
patent: 0 506 590 (1992-03-01), None
patent: 0 533 533 (1992-09-01), None

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