Motor vehicles – Special driving device – Portable track
Reexamination Certificate
2011-06-28
2011-06-28
Dickson, Paul N (Department: 3611)
Motor vehicles
Special driving device
Portable track
C180S009460, C180S009520, C180S009580
Reexamination Certificate
active
07967087
ABSTRACT:
A machine is provided. The machine has a forward direction of travel and includes a frame, at least one lift arm, a first torsion axle assembly, an undercarriage, and an endless track. The lift arm is pivotally attached to the frame. The first torsion axle assembly is attached to the frame and includes a first torsion arm, a first torsion shaft, and a first axle, with the first torsion shaft and the first axle extending from the first torsion arm. The undercarriage is attached to the first torsion axle assembly and the endless track encircles the undercarriage. 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. The first torsion arm extends upward from the frame at an angle between 90 and 180 degrees from the forward direction of travel.
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Arulraja Mylvaganam
Bottom Michael
Freberg Michael S.
Layko Michael C.
Parker Jeffrey M.
Arce Marlon A
Beckman William A.
Caterpillar SARL
Dickson Paul N
Miller Matthias & Hull
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