Switch device having self-cleaning function
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United States of America Patent
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-
Jan 18, 2005
Grant Date -
Aug 5, 2004
app pub date -
Jan 21, 2004
filing date -
Feb 3, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A switch device that prevents a contact failure from occurring between electrode contact points by having a self-cleaning function is provided. When a key top 4 is pushed downward, a portion between a winding start end 7b and a winding terminal end 7c of a spiral contactor 7 is extended by an operation part 3B provided in an actuator 3. At this time, the winding start end 7c slides along the surface of a stationary electrode 5. As a result, dusts or stains attached to the winding terminal end 7c and/or the stationary electrode 5, oxide films formed on the surfaces of the electrodes, etc., is self-cleaned. Therefore, it is possible to solve a contact failure problem between the movable electrode 6 and the stationary electrode 5.
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