Static structures (e.g. – buildings) – With entrance for persons or objects in horizontal or...
Patent
1998-11-12
1999-11-23
Aubrey, Beth
Static structures (e.g., buildings)
With entrance for persons or objects in horizontal or...
404 25, E02D 2914
Patent
active
059878240
ABSTRACT:
A locking manhole cover which may be made of lighter weight material than conventional iron or steel manhole covers has a cover plate dimensioned to fit over a manhole opening. A cylindrical frame is attached to the underside of the cover plate and extends downwardly into the hole when the cover plate is in place. Diametrically opposed apertures are located in the side of the frame; and movable locking members are hingedly attached to the frame adjacent the apertures for pivotal movement through the apertures from a location within the frame to a location where a portion of the locking members engage the sides of the manhole in which the device is located. An operator is mounted inside the frame for effecting the pivotal movement of the locking members by means of an interacting cam or gear arrangement.
REFERENCES:
patent: 3426659 (1969-02-01), Clarke
patent: 4101154 (1978-07-01), Kagstrom
patent: 4964755 (1990-10-01), Lewis
patent: 4974992 (1990-12-01), Harter
patent: 5052851 (1991-10-01), Frishauf
patent: 5082392 (1992-01-01), Marchese
patent: 5328291 (1994-07-01), Wisniewski
patent: 5403116 (1995-04-01), Brewer
Aubrey Beth
Ptak LaValle D.
LandOfFree
Locking manhole cover does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Locking manhole cover, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Locking manhole cover will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1207732