Material or article handling – Elevator or hoist and loading or unloading means therefor – Grab
Patent
1982-11-17
1985-05-14
Spar, Robert J.
Material or article handling
Elevator or hoist and loading or unloading means therefor
Grab
414911, 414621, 294106, B66F 918
Patent
active
045169055
ABSTRACT:
A roll clamp for handling of rolls or other loads carried by a lift truck. The clamp includes a rotator having a rear base plate for being mounted upon the lift mast of the truck, permitting it to be raised or lowered to a vertical position. A frame is gimballed to the rotator front plate. Extending forwardly from the clamp assembly is a pair of clamp arms which are swingably disposed, or pivot relative to the frame for closing and opening by movement toward and away from each other. The rotator rotates the frame relative to the mast about a clamp rotation axis. Hydraulic cylinders selectively open and close the arms, which have clamp pads at their distal ends for engaging the load surfaces. The rotator base plate carries a swash ring defining a plane skewed relative to the axis of clamp rotation. The frame includes rollers bearing against the ring to tilt the frame relative to the rotation axis as the clamp rotates, causing the clamp arms to skew relative to the pivot axis as the base is rotated and automatically causing one arm to overextend the other when the clamp arms are in an orientation for horizontal load disposition.
REFERENCES:
patent: 2815873 (1957-12-01), Vance
patent: 2870929 (1959-01-01), Quayle
patent: 3198568 (1965-08-01), Mindrum
patent: 4177000 (1979-12-01), Weinert et al.
patent: 4227850 (1980-10-01), Farmer et al.
patent: 4435119 (1984-03-01), House
Cavin J. N.
Frees Kenneth A.
Hoover Universal Inc.
Muncy Ken
Spar Robert J.
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