Ignition key switch apparatus with improved snap action mechanism
US8173915B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2008 |
| Grant date | May 8, 2012 |
| Priority date | — |
| Expiry date | Dec 5, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H19/63
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ignition key switch apparatus having a compact size, high current capability, and a snap action mechanism. A pre-loaded snap spring can be configured to include a fixed end attached to an anchor and a free end attached to a movable contact operable between normal and actuated positions. A cam can be utilized to convert a rotary motion at a key interface into a linear movement of a plunger for snap spring blade actuation. The unique pre-loaded snap spring generates a fast (e.g., instantaneous) movement from an open to a closed position and vice versa upon application/removal of a load to reduce the effect of arcing on associated contacts and conductors. The pre-loaded snap spring also ensures that the movable contact does not remain in any intermittent position, other than the two extreme positions given at any position of the plunger.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.