Hoist with load shifted gear, detector, and motor speed changer
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United States of America Patent
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Feb 8, 1994
Grant Date -
N/A
app pub date -
Mar 18, 1992
filing date -
Apr 22, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electric hoist comprising an electric motor and a sheave driven by the electric motor via a reduction gear. The reduction gear comprises a pair of helical gears meshing with each other. One of the helical gears is axially movably arranged on a shaft and is moved in the axial direction thereof when there is a load on the load chain supported by the sheave, and when the axial movement of the movable helical gear is detected by a sensor, the speed of rotation of the electric motor is automatically changed from a higher speed to a lower speed.
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