Quiet ferrofluid solenoid with cushion
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United States of America Patent
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Sep 21, 1999
Issued Date -
N/A
app pub date -
Mar 26, 1998
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. A cushion located between the plunger and a butt toward which it moves also reduces the noise, while the ferrofluid maintains a relatively high solenoid force relative to a solenoid with air gaps.
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