Patent ID: 7967087

Claim:
A machine having a forward direction of travel comprising: a frame; at least one lift arm pivotally attached to the frame; a first torsion axle assembly attached to the frame and including a first torsion arm, a first torsion shaft and a first axle, wherein the first torsion shaft and the first axle extend from the first torsion arm; an undercarriage attached to the first torsion axle assembly; an endless track encircling the undercarriage; wherein one of the first torsion shaft and the first axle is attached to the frame and the other of the first torsion shaft and the first axle is attached to the undercarriage, and the first torsion arm extends upward from the frame at an angle between 90 and 180 degrees from the forward direction of travel and; a second torsion axle assembly attached to the frame and the undercarriage and including a second torsion arm, a second torsion shaft, and a second axle, wherein the second torsion shaft and the second axle extend from the second torsion arm, the second torsion axle assembly positioned rearward of the first torsion axle assembly along the forward direction of travel, wherein one of the second torsion shaft and the second axle is attached to the frame and the other of the second torsion shaft and the second axle is attached to the undercarriage, and the second torsion arm extends downward from the frame at an angle between 270 and 360 degrees from the forward direction of travel, and wherein the undercarriage has a roller frame and the first axle is attached to an upper surface of the roller frame and the second axle extends through the roller frame.