Method and apparatus for detecting mechanical overload of a hoist
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United States of America Patent
Stats
-
Aug 28, 1990
Grant Date -
N/A
app pub date -
Jan 31, 1989
filing date -
Jan 31, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hoist for raising and lowering objects with an apparatus for detecting mechanical overload of the hoist. The system provides a hoist having an alternating current motor connected to an alternating current power supply. The level of current of the power supplied to the motor is compared to a level of power indicative of a mechanical overload condition. If the current signal representative of the actual motor current level equals or exceeds the mechanical overload reference current then an overload output signal is provided.
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Cited Art Landscape
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