Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent
1994-01-06
1995-05-23
Kramer, Dean
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Locking device
294907, 414730, 901 46, B66C 142, B25J 1902
Patent
active
054174643
ABSTRACT:
A load is gripped between a pair of load-engaging surfaces while the magnitude of any slippage between the load and the surfaces is variably sensed. A slip-correcting system variably predetermines an increase in the grip sufficient at least to decelerate the sensed magnitude of slippage, and the grip is automatically variably increased accordingly. Preferably, the magnitude of slippage sensed is a magnitude of relative movement between the load and the load-engaging surfaces, and preferably the magnitude of relative movement is a time-based magnitude such acceleration. The predetermined increase in the grip resulting from the sensed magnitude of slippage is preferably a predetermined increase in the proximity of the load-engaging surfaces, rather than any particular increase in the gripping force applied by the surfaces. A preferred fluid-powered embodiment of the clamp apparatus is disclosed for use on lift trucks in handling paper rolls and the like.
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Seaberg Richard D.
Skinner Jeffrey R.
Cascade Corporation
Kramer Dean
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