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Apparatus and method for detecting dangerous conditions in power equipment

  • US 8,413,559 B2
  • Filed: 08/29/2011
  • Issued: 04/09/2013
  • Est. Priority Date: 08/14/2000
  • Status: Expired due to Term
First Claim
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1. A woodworking machine comprising:

  • a motor;

    a cutting tool driven by the motor, where the cutting tool is electrically isolated;

    an excitation system adapted to generate an electrical signal;

    a capacitive coupling adapted to capacitively couple the excitation system to the cutting tool to transfer at least a portion of the electrical signal, to the cutting tool, where the capacitive coupling includes a conductive plate adjacent the cutting tool; and

    an insulating spacer intermediate the cutting tool and conductive plate.

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