Visual indicator
US4829820A · kind A · utility
6Cited by
30References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1987 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Oct 15, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/162
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gauge or indicator (20) for providing a positive on/off visual indication comprises a lens (22) and a transition mount (24) with a resilient diaphragm (32) secured therebetween to define a sealed chamber therein. The chamber is filled with an opaque liquid (34) and a contrasting plug (36) which is secured to the diaphragm (32) and movable therewith responsive to an actuator stem (38) between an "off" position obscured by the liquid and an "on" position wherein the plug is visible behind the lens (22) upon displacement of the liquid. Additional embodiments (50, and 70) are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.