Solenoid with noise reduction
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United States of America Patent
Stats
-
May 22, 2007
Grant Date -
Nov 18, 2004
app pub date -
Jan 22, 2004
filing date -
May 15, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A solenoid having a housing and a coil disposed in the housing for generating a magnetic field when an electric current passes through the coil. A center pole is disposed within the coil, and the center pole is made of a ferromagnetic material. A rod assembly is movably disposed in the housing for movement between a rest position and an energized position. The rod assembly has a portion thereof disposed in the center pole, and includes a magnet having a polarity causing the magnet to be repelled from the center pole when an electric current passes through the coil. The magnet is encapsulated by an elastomeric material that contacts a stop surface when in the rest position to reduce noise resulting from shifting of the rod assembly from the energized position to the rest position.
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