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Secure non-contact switch

  • US 8,699,200 B2
  • Filed: 08/30/2010
  • Issued: 04/15/2014
  • Est. Priority Date: 02/05/2010
  • Status: Active Grant
First Claim
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1. A redundant non-contact switch for reporting a status as closed or open for a first member and second member that move relative to each other between an open state and a closed state, comprising:

  • a magnet attached to one of the first member and the second member;

    a first inductive power transfer coil attached to the same one of the first member and the second member as the magnet;

    a combined coil attached to the other of the first member and the second member, the combined coil configured as a second inductive power transfer coil paired with the first inductive power transfer coil, the combined coil further configured as a flux gate paired with the magnet, the magnet and the flux gate are configured as a magnetic pair that is registered as closed when the first member and the second member are in the closed state; and

    the redundant non-contact switch is configured to report the interlock status as closed only if the magnetic pair is registered as closed.

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