Vacuum operated servo
US4230077A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1978 |
| Grant date | Oct 28, 1980 |
| Priority date | — |
| Expiry date | Aug 23, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S123/11
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vacuum operated servo comprises a vacuum chamber defined by a flexible diaphragm and a cover, a valve seat secured to the cover so as to project into the vacuum chamber, a valve body yieldably mounted on the flexible diaphragm, a first vacuum conduit with a first valve for inducing vacuum from a vacuum source into the vacuum chamber through the valve seat, a second vacuum conduit with a second valve for inducing vacuum from the vacuum source into the vacuum chamber, and a leak orifice for leaking the vacuum in the vacuum chamber. When the first valve is opened to induce vacuum of the vacuum source into the vacuum chamber, by the vacuum, the diaphragm is moved so that the valve body contacts with the valve seat. Upon the contact, the induction of the vacuum is interrupted to stop the movement of the diaphragm, with the vacuum being introduced and leaked out of the vacuum chamber. When the second valve is opened to induce the vacuum of the vacuum source into the vacuum chamber, the vacuum moves the diaphragm to contact a stopper provided on the diaphragm with the cover irrespective of operation of the first valve. Therefore the vacuum operated servo provides a plurality of position…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.