Lift truck clamp for handling stacked loads of different sizes

Details Lift truck clamp for handling stacked loads of different sizes Lift truck clamp for handling stacked loads of different sizes

1986-09-22

1987-07-28

Spar, Robert J.

Material or article handling

Elevator or hoist and loading or unloading means therefor

Grab

294 871, 294 88, 414736, B66F 918

Patent

active

046829318

ABSTRACT:
A load clamp has two selectively openable and closable opposing clamping assemblies, one of which comprises at least a pair of clamp arms movable separately from each other toward and away from the other clamping assembly. Separate actuators for the respective clamp arms are controlled automatically in such a way that, during closure, the respective movements are simultaneous until such time as one of the arms attains a predetermined clamping force, at which time an override system permits their respective movements to become non-simultaneous to enable further closure of the other clamp arm. Corresponding actuator regulation occurs during opening of the clamp arms, the override function being triggered by full opening of one of the clamp arms.

REFERENCES:
patent: 2706060 (1955-04-01), Ferrario et al.
patent: 3583586 (1971-06-01), Burton
patent: 3990594 (1976-11-01), Olson et al.
patent: 4127205 (1978-11-01), Farmer et al.
patent: 4318661 (1982-03-01), Helm
patent: 4397495 (1983-08-01), Lewis

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