Operator sensing circuit for disabling motor of power equipment
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United States of America Patent
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-
Sep 14, 2010
Grant Date -
Dec 7, 2006
app pub date -
Aug 15, 2006
filing date -
Feb 17, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electrical characteristic in an operator-sensing circuit having a microcontroller that commands a charge sensor to send a sensor charge signal to a capacitive sensing element. The charge sensor outputs a corresponding raw data signal to the microcontroller that in turn sends a signal that disables the motor of a unit power equipment upon the absence of an operator's hand on a hand-gripping surface of the equipment. Capacitive means for operating within a predetermined charge range that includes preselected values that designate hands-off and hands-on conditions on the hand-gripping surface. The capacitor charge range is effective to distinguish between the presence of an operator's hand and foreign material on the gripping surface for avoiding a false hands-on-signal.
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