Lift truck load clamp having power-actuated pivotal subframe for

Material or article handling – Elevator or hoist and loading or unloading means therefor – Grab

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294 88, 294106, 414621, 414642, 414911, B66F 918

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active

044351194

ABSTRACT:
A lift truck rotatable paper roll handling clamp of the pivoted arm type for clamping paper rolls of varying diameters and shifting the position of the roll relative to the lift truck between a position of unequal extension, wherein the forward end of one clamp arm extends a greater distance forwardly than the forward end of the other clamp arm, and a position of equal extension wherein the forward ends of the clamp arms extend a substantially equal distance forwardly of the lift truck. The clamp has a rotatable frame upon which a subframe is mounted by a first pivotal connection for selective tilting of the subframe relative to the rotatable frame. Mounted upon the subframe are a pair of clamp arms, each being pivotally connected to the subframe at spaced pivotal connections located on either side of the first pivotal connection. One clamp arm is longer than the other, and pivots with respect to the subframe through a greater maximum angle than does the other arm. The respective hydraulic power actuators for pivoting the subframe relative to the rotatable frame and for pivoting each clamp arm relative to the subframe are in a compact arrangement all intersecting a common plane perpendicular to the axis of rotation of the rotator to minimize the forward protrusion of the paper rolls and thereby maximize the weight-carrying capacity of the lift truck.

REFERENCES:
patent: 2815878 (1957-12-01), Vance
patent: 2916171 (1959-12-01), Schwarz
patent: 3139302 (1964-06-01), Orloff et al.
patent: 3342359 (1967-09-01), Sawdey
patent: 3363929 (1968-01-01), Nelson
patent: 3407951 (1968-10-01), Faust et al.
patent: 3896957 (1975-07-01), Sinclair
patent: 3982782 (1976-09-01), Bos
patent: 4127205 (1978-11-01), Farmer et al.
patent: 4209280 (1980-06-01), Bittner
patent: 4217074 (1980-08-01), Leasor et al.
2-A Roll Clamp Assembly, Wilby Manufacturing, Ltd., Canada, Dec. 7, 1977.

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