Patent ID: 8699200
Filing Date: 2014-04-15
Classification: G07C

Abstract:
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.