Fail-safe electric actuator
US4757684A · kind A · utility
18Cited by
7References
10Claims
0Family size
Inventor
Key dates
| Filing date | Apr 8, 1981 |
| Grant date | Jul 19, 1988 |
| Priority date | — |
| Expiry date | Apr 8, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S60/911
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fail-safe electric actuator, for use with a control mechanism such as a valve, is disclosed. The actuator device eliminates the possibility of the control mechanism being locked in operative position by the interruption of electric power, by automatically and mechanically returning the control mechanism to its inopertive position as soon as current is cut off. This is accomplished by the release of a torsion spring, wound previously by the rotation of a fluid-driven vaned torque actuator in turning both the control-mechanism and the electric fail-safe actuator into operative position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.