Patent ID: 7811217

Claim:
A balance board exercise apparatus comprising, in combination: an elongated board having a supporting frame; a sub-frame underneath the frame; a wheel assembly having a shaft non-rotatably secured within the sub-frame to provide a fulcrum for supporting the board from the ground at its longitudinal center, the board having a pair of footpads on its upper surface on respective sides of the fulcrum; a parallel pair of drive wheels rotatably supported upon the shaft and equipped with rack gears on their mutually facing sides; a differential pinion case mounted upon the shaft and drivingly engaging the rack gears for differentially driving the wheels; a hub motor co-operatively mounted between the shaft and the differential pinion case; and control means including a switching control unit, a single-axis wheel supported on the ground, and a linkage from the single-axis wheel to the control unit which is responsive to movements of the elongated board relative to ground to activate the hub motor.