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US 4,304,432 AGranted
Plate-lifting device
AssigneeCavaz, Hanlon & Silva
InventorFred D. Silva
Life of this patent
Estimating the term…
Abstract
A device for lifting a cover plate, the cover plate having a hole therein with opposed beveled surfaces, preferably at the center of gravity of the plate, which device includes a lifting element having an eye extended above laterally expanded, beveled portions, the beveled portions being slightly shallower than the thickness of the plate and of dimensions adapted to correspond in size and angle with the beveled surfaces of the plate.
Claims7
A device for lifting a cover plate having a lifting hole with pyramidal opposed beveled surfaces, said device comprising:
- a. a lifting element having an eye and two lower, laterally expanded, pyramidal beveled portions, each of said beveled portions having a depth less than the thickness of said cover plate and a length greater than its depth, and
- b. locking means movable with respect to said beveled portions connected to said lifting element and having one position with respect to said plate in which the beveled portions of said lifting element are locked in position with respect to the beveled surfaces of said plate in which vertical force applied to said lifting element will bring said beveled portions into engagement with said beveled surfaces.
Dependencies are inferred from the claim text.