Lever hoist with overload preventing device
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United States of America Patent
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-
Feb 11, 2003
Grant Date -
Oct 24, 2002
app pub date -
Apr 23, 2001
filing date -
Apr 23, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A lever hoist with an overload preventing device comprises a pressing member for rotatably pressing a pressed member via a reverse rotation preventing ring and a pair of friction members, and a rotation drive member capable of transmitting rotating force of a chain wheel to the pressing member and movable in an axial direction. The rotation drive member is urged toward the pressing member by a disk spring. Locking teeth are formed at surfaces facing each other, of the pressing member and the rotation drive member, respectively. Respective pressed surfaces during a hoisting-down operation, of the locking teeth are sharply inclined, while respective pressed surfaces during a hoisting-up operation are moderately inclined. A rotation limiting member is interposed between the rotation drive member and the disk spring. Even if the rotation drive member is rotated in an overload state, the rotating force of the rotation drive member cannot be transmitted to the disk spring and a nut.
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