Safety system utilizing a passive sensor to detect the presence of a hand of a worker and provide a signal to interrupt the operation of a machine

  • US 6,418,004 B1
  • Filed: 12/02/1999
  • Issued: 07/09/2002
  • Est. Priority Date: 12/02/1998
  • Status: Expired due to Term
First Claim
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1. A wood chipping machine comprising a safety system, said wood chipping machine including:

  • chipping blades that rotate to chip material delivered to the machine;

    a feed rollers that grip and feed the material to the chipping blades;

    a feed chute that guides material to the feed rollers, the feed chute having walls defining a passage, an open front end for receiving the material and an open rear end adjacent the feed rollers; and

    a motor that drives the feed rollers and the chipping blades;

    said safety system comprising;

    at least one passive sensor incorporated in a band worn by a user of the wood chipping machine;

    at least one sensing coil mounted on one of the walls of the chute, the sensing coil generating a signal when the passive sensor is in the passage; and

    means for stopping the chipping blades and/or the feed rollers in response to the signal.

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