Normally closed switch
US4119821A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1977 |
| Grant date | Oct 10, 1978 |
| Priority date | — |
| Expiry date | Sep 26, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H1/242
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switch case has a top provided with a central opening in which slides the stem of a plunger that has a foot inside the case. A bridging contact spring has a central portion engaging the foot and has free end portions extending away from opposite sides of the foot to form movable contacts normally engaging stationary electric contacts in the case beneath the movable contacts. Between each stationary contact and the central portion of the spring there is a fulcrum member beneath a movable contact so that when the central portion of the spring is moved downwardly by depressing the plunger, the movable contacts will rock on the fulcrum members and lift away from the stationary contacts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.