Motor-speed reducer device including safety means for driving an element
US4918998A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1988 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Nov 7, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/55
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor-speed reducer includes a driving input shaft, an output shaft and a deformable coupling coupling the input shaft to the output shaft. The coupling includes a worm and a speed reducer driven by the worm. A sensor is also provided for detecting torque between the input shaft and the output shaft during operation of the device which causes deformation of the coupling. The sensor includes two electrically conductive tracks. One track is associated with an input side of the coupling and the other track is associated with an output side of the coupling. An electrical circuit is connected to the tracks and monitors movement of each track to detect a change in torque as a function of a change in the movement of one of the electrically conductive tracks relative to the other track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.