Pneumatic indicator
US3999437A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1975 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Oct 9, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B5/06
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The invention relates to a pneumatic indicator comprising a member or body and a transparent window behind which a spherical pivoting moving body can assume two distinct positions visible from the outside when the end of a lever placed in the member transmits to a cavity of the moving body, either the movements of a membrane or of a piston under pressure action or the movements resulting from a restoring spring. Such indicators are particularly used in equipment for monitoring the operation of an installation controlled by automatic pneumatic equipment or in industrial atmospheres where incandescent lamps cannot be used because of the explosion hazard.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.