Closure fasteners – Clamps – Portable
Patent
1975-04-28
1976-09-14
Moore, Richard E.
Closure fasteners
Clamps
Portable
292212, 29225667, E05C 1918
Patent
active
039803295
ABSTRACT:
A manhole cover lock is provided employing two units diametrically situated and extending through openings in the manhole cover. The units engage a projection of the manhole cover housing to prevent the removal of the manhole cover when the units are in position. The units comprise a cylindrical body having a yoke at one end, a locking plate pivotally mounted in the yoke, with a flanged face opposite the yoke, and having a central recess. Extending through the body is an eccentric bore, in which a rod is housed, cooperating with said locking plate to provide a dog lock. A threaded bolt having a keyed head is threaded into a threaded axial bore in said body to prevent axial movement of said rod. An alternate embodiment of the threaded bolt includes modification of the head of the threaded bolt to allow the head to receive a special wrench for firmly tightening the threaded bolt thereby additionally securing the manhole lock in position.
REFERENCES:
patent: 699580 (1902-05-01), Scrivens
patent: 1473986 (1923-11-01), Brown
patent: 1750812 (1930-03-01), Netschert
patent: 1756185 (1930-04-01), Folck
patent: 2926026 (1960-02-01), Matteson
patent: 3248994 (1966-05-01), Mortensen
Loc-Coe
Moore Richard E.
LandOfFree
Manhole cover lock does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Manhole cover lock, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manhole cover lock will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1023642