Differential pressure switch device responsive to differential pressure and temperature change
US4266517A · kind A · utility
8Cited by
7References
8Claims
0Family size
Inventors
Key dates
| Filing date | Jun 21, 1979 |
| Grant date | May 12, 1981 |
| Priority date | — |
| Expiry date | Jun 21, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H37/585
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A differential pressure switch device having a flexible diaphragm between two chambers subject to differential pressure, a permanent magnet movable with the diaphragm against a biasing force when pressure differences occur in the chambers, a thermo ferrite combined with the magnet for cooperation therewith, and a reed switch assembly actuated by the movement of the magnet and through the action of the thermo ferrite which becomes magnetic or non-magnetic depending on the temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.