Motorized lifting device with a grooved drum for lifting a load and determining a weight of the load while lifting
US9598269B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Apr 4, 2014 |
| Grant date | Mar 21, 2017 |
| Priority date | — |
| Expiry date | Nov 20, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01G23/3728
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.