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Safety systems for power equipment

  • US 9,724,840 B2
  • Filed: 03/13/2002
  • Issued: 08/08/2017
  • Est. Priority Date: 10/01/1999
  • Status: Expired due to Term
First Claim
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1. A machine comprising:

  • an operative structure adapted to perform a task, where the operative structure includes a circular blade having a perimeter and teeth disposed about the perimeter, where the blade is adapted to spin, and where the blade when spinning cuts an object that moves into contact with the teeth;

    an electronic detection circuit including an electrical connection to the blade, where the electronic detection circuit is configured to detect when a person is in contact with the teeth when the blade is spinning; and

    an electrically triggerable actuator supported by the operative structure and electrically connected to the electronic detection circuit, where the actuator generates a force that causes the blade to stop cutting the person within 10 milliseconds after being triggered if the person moves into contact with the teeth at a rate of one foot per second or less.

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