Pressure switch with biaxially oriented thermoplastic diaphragm
US5932857A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1997 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | May 6, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pressure responsive electric switch (10) is shown having an improved flexible diaphragm (28) to extend the useful life of the switch particularly when used with fluid media of a corrosive nature. The flexible diaphragm (28) comprises a base layer (28a) of resin having excellent mechanical properties over a wide range of temperature and a first level of fold endurance capability covered on one or both face surfaces with a protective layer (28b) of resin having excellent corrosion resistance capability and a second level of fold endurance capability at least as great as the first level. In a second embodiment, the flexible diaphragm is composed of biaxially oriented polyphenylene sulfide which can be used without additional protective layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.