Crane winch device and crane
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United States of America Patent
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Nov 2, 2021
Grant Date -
Sep 10, 2020
app pub date -
Mar 2, 2020
filing date -
Mar 4, 2019
priority date (Note) -
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status (Latency Note)
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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.
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