Actuator with a built-in reed switch
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United States of America Patent
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-
May 12, 1992
Grant Date -
N/A
app pub date -
Aug 31, 1990
filing date -
Jan 8, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An actuator with a built-in reed switch includes a solenoid, a plunger made of magnetic material and movable within a coil of the solenoid, a plunger receiver made of magnetic material and fixedly mounted in the solenoid coil, a magnetic responsive reed switch connected in series to the solenoid coil and disposed near a gap between the plunger and the plunger receiver, and a sensor terminal branched from a junction between the solenoid coil and the reed switch, whereby contacts of the reed switch are closed by a magnetic field generated when a current flows through the sensor terminal in the solenoid coil. The actuator shifts from high sensitivity to lower sensitivity and supplies a sufficient driving force as an actuator.
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