Overload detection mechanism for motor-driven linear actuator
US4910419A · kind A · utility
51Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 28, 1989 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Feb 28, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a linear actuator comprising a motor-driven screw shaft, an overload detection mechanism comprises a pair of cup-shaped spring seats with substantially cylindrical portions. The spring seats are mounted at one end of the screw shaft by a pair of bearings and have a spring therebetween under a predetermined preload. Limit switches are provided for detecting overload on the screw shaft as a result of axial movement of the spring seats. The cylindrical portions of the cup-shaped spring seats serve as strikers for said limit switch means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.