Lever-operated hoist
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United States of America Patent
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-
Oct 20, 1992
Grant Date -
N/A
app pub date -
Nov 20, 1990
filing date -
Nov 25, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lever-operated hoist having a structure for continuously lowering the lower hook side chain and end side chain of load chains in no-load state comprising a pressure drive member movably screwed in the axial direction on a drive shaft, a rotation limiting member spline-fitted on the drive shaft adjacently to the pressure drive member, and an operation wheel rotatably disposed on the rotation limiting member, a first projection and a second projection extending in the radial direction are disposed at specified intervals in the circumferential direction at the outer end face in the axial direction of the pressure driving member, two circumferential spaces are divided and formed by them, and the rotation limiting protuberance of the rotating limiting member and the pressure release protuberance of the operating wheel are projecting into these two spaces. By the impact action or abutting action of these two protuberances to the first projection, rotation stop of the pressure drive member in no-load operation and contact with other member may be prevented, so that smooth and continuous chain operation may be realized.
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