Combination motorized and manual drive for lifts
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United States of America Patent
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Jan 26, 1999
Grant Date -
N/A
app pub date -
Sep 23, 1996
filing date -
Sep 23, 1996
priority date (Note) -
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Abstract
A power option is provided for a manually-operated material lift that employs a telescoping mast system which is extended or retracted by a winch. A reversible electric motor is connected to the winch via two-way reduction gearing that remains in the drive train during manual operation and requires no clutches or disconnect means. The power option is initiated by selecting the position of a reversing switch that controls the motor, and closing an on/off switch which energizes the motor for rotation in the selected direction. When the on/off switch is open, the lift may be manually operated in the conventional manner.
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