Magnetic sensor switch
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United States of America Patent
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Mar 25, 2003
Grant Date -
Oct 17, 2002
app pub date -
Jan 25, 2002
filing date -
Jan 25, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetic sensor switch is provided in which a magnetic sensor is responsive only when a magnet approaches it, to turn electrical contacts of the switch on and off. A cylindrical magnetic sensor having oppositely polarized magnetic poles at opposite ends thereof is mounted for rotation in clockwise and counter-clockwise directions. An auxiliary magnet is located in a region outside of the rotating radius of the magnetic sensor and in the vicinity of one magnetic pole of the magnetic sensor. The auxiliary magnet imparts a biasing force for holding the magnetic sensor at a position rotated through a predetermined angle. A movable contact piece is attached to the magnetic sensor and is adapted to be rotated as the magnetic sensor is rotated to thereby bring corresponding contact or contacts of the movable contact piece into contact with one of a pair of fixed contact pieces located in opposition to the contacts of the movable contact piece.
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