Patent ID: 8272331

Claim:
A transport system comprising: a guideway including a main rail and auxiliary rails in spaced parallel relation to said main rail, a carrier movable along said guideway and including a single main wheel for riding on said main rail and auxiliary wheels for contact with said main and auxiliary rails, and drive and braking means for said single main wheel, wherein said carrier includes means for supporting a load to be carried above said single main wheel, wherein said auxiliary wheels include tilt control and balance control wheels which are so positioned and so operate in contact with said main and auxiliary rails as to cause said single main wheel to support at least a major portion of the weight of said carrier and of any load carried by said carrier above said single main wheel, wherein said auxiliary rails include first and second rails that are on opposite sides of and in symmetrical relation to a central vertical plane through said main rail, wherein said tilt control wheels engage said first and second rails to limit tilting of said carrier about a central longitudinal axis through said plane and along the top of said main rail, and wherein said balance control wheels control balance of said carrier about the axis of said single main wheel.