Lifting apparatus and method
US7021427B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2002 |
| Grant date | Apr 4, 2006 |
| Priority date | — |
| Expiry date | Dec 22, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S187/901
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method for intelligent control includes an exchange of historical parameters of events for operating a system and operating a hoist where an electric motor, preferably a DC-motor, is used for lifting and lowering a lifting belt. It can take place at different speeds by registering amperage through the motor and to perform a switching between fast and slow speed when a given current level is reached. The change in hoisting/lowering speed is achieved when a control unit changes the voltage supplied by the battery unit to the DC-motor or changes the frequency of power supply to an AC-motor. The method makes it possible to control the system and to optimize the hoisting/lowering speed for the lifting belt depending on the load thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.