US Patent 7780573 Omni-directional treadmill with applications

A treadmill having a track assembly that allows a user to navigate in any arbitrary direction. A movable user support has a plurality of rotatable members that rotate about axes normal to the direction of movement of the user support. Separate power drive mechanism concurrently move the user support and rotate the members to omni-directional user movement. A control for the power driven mechanism is responsive to the directional orientation of the user on the user support to cause the user support to operate in the direction of the orientation of the user.