Motorized lifting device with a grooved drum for lifting a load and determining a weight of the load while lifting
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United States of America Patent
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Mar 21, 2017
Grant Date -
Oct 8, 2015
app pub date -
Apr 4, 2014
filing date -
Apr 4, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus includes a drum to draw in or let out a line and a motor and transmission coupled to the drum to apply a torque thereto. A power sensor measures an amount of current drawn and/or voltage supplied to the motor as the motor applies torque to the line. A processor calculates an amount of weight that is attached to the line based on the amount of power consumed by the motor. Alternatively, if the motor is operated in generator mode, a current sensor may measure an amount of current generated by the motor and the processor may calculate an amount of weight that is attached to the line based at least partly on an amount of current that is generated by the motor.
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