Ignition key switch apparatus with improved snap action mechanism
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United States of America Patent
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-
May 8, 2012
Grant Date -
Jun 10, 2010
app pub date -
Dec 10, 2008
filing date -
Dec 10, 2008
priority date (Note) -
In Force
status (Latency Note)
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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.
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