Crane winch device and crane
AssigneeSumitomo Heavy Industries Construction Cranes Co., Ltd.
InventorKohei Honjo
Life of this patent
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Abstract
There is provided a crane winch device allowing a suspended load to freely fall due to a load thereof. The crane winch device includes a winch drum around which a rope for suspending the suspended load is wound, braking brake unit that brakes the winch drum, speed-increasing unit that performs speed-increasing assist of the winch drum in a direction of free fall acceleration when a braking force of the brake unit is smaller than a first threshold, and an adjustment unit that adjusts the first threshold.
Claims11
A crane winch device allowing a suspended load to freely fall due to a load thereof, the device comprising:
- a winch drum around which a rope for suspending the suspended load is wound;
- a brake unit that brakes the winch drum;
- a speed-increasing unit that performs speed-increasing assist of the winch drum in a direction of free fall acceleration when a braking force of the brake unit is smaller than a first threshold;
- and
- an adjustment unit that adjusts the first threshold.
Dependencies are inferred from the claim text.