Patent ID: 7147261

Claim:
A seat track assembly for a seat of a motor vehicle having a floor and an airbag, said seat track assembly comprising: a stationary rail fixedly secured to the floor; a movable rail fixedly secured to the seat and slidably engaged with said stationary rail to move the seat therealong, said movable rail extending along a length between a forward position and a rearward position; a shunt defining an elongated body extending longitudinally along a portion of said length of said movable rail, said elongated body comprising a metallic strip having a portion thereof completely encased in a thermoplastic material along the longitudinal length of the metallic strip thereby defining a ferromagnetic surface adjacent a non-ferromagnetic surface; and a magnetic sensor fixedly secured to said stationary rail and disposed adjacent said shunt to determine a magnetic field strength and responsively produce a position signal indicating a position of said sensor relative to said shunt whereby said sensor sand said shunt are disposed within said stationary and movable rails to be protected thereby.