Motor-driven, spring-returned rotary actuator
US5310021A · kind A · utility
22Cited by
8References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1993 |
| Grant date | May 10, 1994 |
| Priority date | — |
| Expiry date | Feb 18, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F2013/146
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An electric motor acts through a gear train to rotate an output shaft in one direction while a torsion spring rotates the shaft in the opposite direction when the motor is de-energized. When the output shaft stops abruptly at a limit position after being rotated by the spring, a lost-motion drive connection permits the output gear of the drive train to rotate relative to the shaft in order to dissipate kinetic energy through the gear train and to avoid impact loading of the gear train and the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.