Quiet ferrofluid solenoid
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United States of America Patent
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Oct 19, 1999
Grant Date -
N/A
app pub date -
Aug 28, 1996
filing date -
Aug 28, 1996
priority date (Note) -
Expired
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Abstract
A solenoid includes a ferrofluid in gaps between the moving and stationary elements which ferrofluid reduces noise caused by activating a plunger positioned within the solenoid. A permanent magnet can be included as a solenoid element to increase magnetic field strength within the solenoid to retain the ferrofluid within the solenoid.
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