Linear actuator
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United States of America Patent
Stats
-
May 1, 2007
Grant Date -
Oct 5, 2006
app pub date -
Mar 31, 2005
filing date -
Mar 31, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A linear actuator having a housing, a plunger slidably mounted to the housing between an extended and retracted position, and an electric motor drivingly connected to the plunger to move the plunger between its extended and retracted positions. A motor circuit controls the activation of the motor circuit and deactivates the motor circuit whenever the motor current exceeds a threshold value which varies as a function of the supply voltage to the electric motor and/or temperature. A memory storage unit stores the position of the plunger. Whenever the position of the plunger is in a state of transition between its retracted and extended position upon system initialization, the motor control circuit activates the motor to drive the plunger to a preselected extended or retracted position.
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