Device permitting a plug or a cover to lock in a detachable...

Details Device permitting a plug or a cover to lock in a detachable... Device permitting a plug or a cover to lock in a detachable...

2005-11-22

2008-11-25

Addie, Raymond W (Department: 3671)

Road structure, process, or apparatus

Pavement

Vault cover-closure

C052S019000, C411S166000, C411S197000, C411S223000, C411S910000

Reexamination Certificate

active

07455474

ABSTRACT:
This invention is a device permitting a plug or a cover to lock in a detachable manner onto a frame.In accordance with the invention, the metal washer (9), interposed between the screw head (4) and the mounting surface (7) formed at the bottom of the housing (5) of the cover (2), includes two radial wings diametrically opposite (9a) working together with internal parts (13) of the housing (5) butting and preventing a rotation of the washer (9) during tightening of the fastening screw (3).The invention has applications for public roadways.

REFERENCES:
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patent: 3519279 (1970-07-01), Wagner
patent: 4156756 (1979-05-01), Green
patent: 4298298 (1981-11-01), Pontone
patent: 4422137 (1983-12-01), Watts
patent: 4723866 (1988-02-01), McCauley
patent: 4907911 (1990-03-01), Rodriguez et al.
patent: 5628152 (1997-05-01), Bowman
patent: 5697729 (1997-12-01), Bowman
patent: 5788406 (1998-08-01), Hernandez
patent: 6007270 (1999-12-01), Bowman
patent: 6199414 (2001-03-01), Chang
patent: 6698973 (2004-03-01), Suatac
patent: 101 59 121 (2003-06-01), None

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