Detection systems for power equipment
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United States of America Patent
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Jul 5, 2011
Grant Date -
Sep 24, 2009
app pub date -
Dec 31, 2008
filing date -
Dec 31, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Methods to detect when a human body contacts a predetermined portion of a machine are disclosed. The methods distinguish contact with a person from contact with other materials. The methods are particularly applicable in woodworking equipment such as table saws to distinguish contact between a person and the blade of the saw from contact between the blade and wet or green wood. The methods and woodworking equipment may include predictive blade stop algorithms that prevent unnecessary activations of a safety brake during coast down of a blade and continued protection in the event a main power switch is turned off.
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