Normally closed pressure responsive switch
US5049708A · kind A · utility
Inventor
Key dates
| Filing date | May 25, 1990 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | May 25, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A normally closed pressure responsive switch has upper and lower housings attached to one another with an electrically conductive snap acting disc placed therebetween. The lower housing includes a base having a recessed area in which a stationary electrical contact is mounted. The snap acting disc is placed on top of the base with a side having a convex configuration facing the stationary contact. An electrically conductive member is placed over the disc with a plurality of contact tabs engageable with the outer peripheral portion of the disc. The upper housing includes a retainer having a bore in which a pressure converter slides. Ribs formed on the bottom of the pressure converter are adapted to engage the outer peripheral portions of the disc between the contact tabs and are captured in grooves of the retainer to restrict angular movement of the pressure converter. A flexible membrane is placed on top of the retainer and pressure converter and an O-ring is received on top of the membrane to seal the pressure receiving surface of the flexible membrane to a pressure source when the switch is mounted for use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.