Abstract: A tracked mobility device includes a pair of track drives having a rear weight-bearing wheel assembly, a center weight-bearing wheel assembly, a forward weight-bearing wheel assembly, and a front roller assembly. The rear weight-bearing wheels, the center weight-bearing wheels, and the forward weight-bearing wheels are fixed to the frame at a height effective to cause the main weight-bearing surface to always have a “V”-shaped lower surface when viewed from the side. The center weight-bearing wheels, the forward weight-bearing wheels, and the front rollers are fixed to the frame at a height effective to cause that portion of each track drive always to have a “V”-shaped lower surface when viewed from the side. At least one powered drive wheel is provided, and at least one of the rollers is a tensioning roller.

Abstract: A tracked mobility device includes a pair of track drives having a rear weight-bearing wheel assembly, a center weight-bearing wheel assembly, a forward weight-bearing wheel assembly, and a front roller assembly. The rear weight-bearing wheels, the center weight-bearing wheels, and the forward weight-bearing wheels are fixed to the frame at a height effective to cause the main weight-bearing surface to always have a “V”-shaped lower surface when viewed from the side. The center weight-bearing wheels, the forward weight-bearing wheels, and the front rollers are fixed to the frame at a height effective to cause that portion of each track drive always to have a “V”-shaped lower surface when viewed from the side. At least one powered drive wheel is provided, and at least one of the rollers is a tensioning roller.

Abstract: A tracked mobility device includes a frame, a pair of track drives connected to the frame, and a rear wheel assembly that is independent of the track drives. Each track drive has a flexible track rotating around a set of wheels, with each set of wheels including a rear powered wheel, a central weight-bearing wheel, and a front roller wheel. The wheels are fixed to the frame at a height effective to cause the track drive always to have a “V”-shaped lower surface when viewed from the side. The independent rear wheel is at a fixed and constant height with respect to the frame, with the fixed and constant height being effective to allow the rear wheel to cooperate with the lowered central portion of each of said track drives to provide a three-point contact with a flat surface.