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Power tool anti-kickback system with rotational rate sensor

  • US 7,552,781 B2
  • Filed: 09/12/2006
  • Issued: 06/30/2009
  • Est. Priority Date: 10/20/2004
  • Status: Active Grant
First Claim
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1. A method for initiating a protective response in a power tool having a rotary shaft rotatably driven by a motor, comprising:

  • monitoring rotational motion of the tool about a longitudinal axis of the shaft using a rotation motion sensor disposed in the power tool;

    determining rotational motion of the power tool based on input to a controller disposed in the power tool from the rotation motion sensor; and

    reducing torque imparted by the motor to the shaft when the rotational motion determined by the controller exceeds a threshold, where the torque is set to a non-zero value that enables an operator of the tool to regain control of the tool.

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