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Self checking safety switch

  • US 6,285,021 B1
  • Filed: 07/27/1999
  • Issued: 09/04/2001
  • Est. Priority Date: 07/27/1999
  • Status: Active Grant
First Claim
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1. A safety switch for controlling power to a machine, comprising:

  • a housing having an opening configured to allow for insertion of a human hand into said opening and self checking switch circuitry contained within said housing, said self checking circuitry comprising;

    a primary emitter that emits a first detectable signal;

    primary monitoring circuitry coupled to said primary emitter that detects said first detectable signal and generates a second detectable signal;

    a primary detector coupled to said primary monitoring circuitry for detecting said first detectable signal and said second detectable signal and adapted to generate an output signal comprised of a combination of said first and second detectable signals;

    said output signal controlling application of power to the machine.

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