Actual operating time indicator
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United States of America Patent
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Jul 12, 1994
Grant Date -
N/A
app pub date -
Mar 1, 1993
filing date -
Mar 12, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
An actual operating time indicator includes: a lifting motor for lifting a load up/down; a power detection unit for detecting an input power based on a current and a voltage supplied to the motor, and converting the input power into a first voltage proportional to the input power; a voltage-to-periodic pulse conversion unit connected to the power detection unit for receiving the first voltage and converting the first voltage into the periodic pulse proportional to the first voltage; a counter unit connected to the voltage-to-periodic pulse conversion unit for counting and integrating the periodic pulse to obtain an integrated power; and a display operatively connected to the counter unit for indicating the integrated power as an actual operating time of the motor.
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