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Contactless switching device for an elevator safety chain

  • US 6,732,839 B2
  • Filed: 01/29/2003
  • Issued: 05/11/2004
  • Est. Priority Date: 08/07/2000
  • Status: Expired due to Term
First Claim
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1. A monitoring device for an elevator comprising:

  • at least two contactlessly actuatable switching devices, each said switching device including an active unit and a passive unit wherein said active unit generates a predetermined pattern as a bit pattern or a bit sequence and said passive unit is excited exclusively by said predetermined pattern, said passive unit being excited by said predetermined pattern at a defined spacing between said active unit and said passive unit; and

    a bus connecting a central checking unit with said at least two switching devices in a safety chain for the elevator.

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