Dual diaphragm three position actuator
US4831915A · kind A · utility
10Cited by
8References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1988 |
| Grant date | May 23, 1989 |
| Priority date | — |
| Expiry date | Jul 15, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B11/123
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A dual diaphragm, multiposition vacuum actuator. Dual diaphragms in a housing define two vacuum chambers. A spring urges one diaphragm and an actuator rod extended, and the other diaphragm retracted. Vacuum in one chamber retracts the extended diaphragm and actuator rod to an intermediate position, and advances the retracted diaphragm. Vacuum added in the other chamber retracts both diaphragms and the rod as a unit to a fully retracted position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.