Patent ID: 7248136

Claim:
A magnetic switching device for detecting relative movement between a first and a second member comprising: a first switch that switches between open and closed contact positions indicating when the first and second members are in proximity to each other; a second switch that has an electrically conductive shiftable body that shifts between simultaneous contact with two switch elements and no simultaneous contact with the two switch elements based upon applied magnetic fields generated by first and second magnetic components, the switch assembly further including: a flux concentrator positioned in proximity with the shiftable body; said flux concentrator providing a reduced reluctance path for an applied magnetic field such that the strength of the applied magnetic field is increased; said flux concentrator directing at least a portion of a magnetic field emanating therefrom toward said switch assembly; a bias ring positioned in proximity to said shiftable body member, the magnetic field emanating from the flux concentrator coupling to the bias ring.