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Machine security systems

  • US 5,548,660 A
  • Filed: 04/06/1995
  • Issued: 08/20/1996
  • Est. Priority Date: 09/24/1979
  • Status: Expired due to Term
First Claim
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1. A security system comprising:

  • (a) an operating station of a machine;

    (b) a personal identification system positioned to attempt to identify a person physically located at the operating station and having a first output for a control signal indicating confirmation of the identity of a person authorized to operate the machine;

    (c) a detector positioned to detect entry to and departure from a select area in the vicinity of and containing the operating station;

    (d) a circuit coupled to the detector, having a second output, and structured to issue a detection signal on the second output when the signals from the detector indicate that a person is alone in the select area; and

    (e) a security device that is coupled to the first output and operable in response to the control signal to allow operation of the machine, and that is coupled to the second output and operable in response to the absence of the detection signal to deactivate the machine.

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