Electric-powered spring-return actuating device
US4677355A · kind A · utility
Inventor
Key dates
| Filing date | May 27, 1986 |
| Grant date | Jun 30, 1987 |
| Priority date | — |
| Expiry date | May 27, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2019/0609
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Electric-powered actuating device usable for the positioning control of valves and the like, featuring a motor, mechanical and spring means capable of driving said valve or other attached devices into a predetermined safety position in case of electrical signal or power failure; said actuating device having electrical amplifying means capable of providing pulsed current to drive said motor in one direction in response to an input signal, a constant current to hold said motor in a selected position, or no power, to allow the mechanical and spring means to reverse the motor direction; additional means are provided to limit the travel to a selected position despite further increases in input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.