Chain block
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United States of America Patent
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Jun 15, 2021
Grant Date -
Feb 27, 2020
app pub date -
Dec 28, 2017
filing date -
Apr 13, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A chain block comprises: a first rotary body in which a first tooth part f is arranged; a second rotary body comprising a second tooth part which opposes to a first tooth part with magnetic attraction force and releasing the magnetic coupling state by sliding toward thrust direction; a clutch pin integrally provided with the second rotary body; a clutch receiving member comprising a plurality of recessed pockets to which the clutch pin enters according to a slide of the second rotary body; wherein the plurality of pockets comprise; a hoisting-side pocket in which a magnetic member is arranged; a lowering-side pocket in which a magnetic member is arranged; and an intermediate pocket which exists between the hoisting-side pocket and the lowering-side pocket and which the clutch pin enters in a state of not being magnetically attracted.
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