Pressure responsive switch particularly adaptable for operation as a normally open or a normally closed switch
US5004876A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1988 |
| Grant date | Apr 2, 1991 |
| Priority date | — |
| Expiry date | Dec 20, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/343
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pressure responsive switch having upper and lower contact assemblies with a snap acting member and an electrically conductive member sandwiched therebetween. The assemblies each include an insulating body with a hollow center and an electrically conductive member having a contact in the center portion and extending externally of the body. The snap acting member is in constant engagement with the sandwiched conductive member and normally in engagement with the electrically conductive member of the upper assembly. When a pressure is applied which is sufficient to cause the snap acting member to snap into its second stable state, the connection thereof with the electrically conductive member in the upper contact assembly is broken and connection is made with the electrically conductive member in the lower assembly. The switch is normally closed by removing the portion of the electrically conductive member in the lower assembly which extends externally thereof. The switch can be provided normally open by removing the portion of the electrically conductive member in the upper assembly which extends externally thereof. In another embodiment, the switch is provided in conjunction with a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.