Patent ID: 8342257

Claim:
A track assembly for a vehicle, the track assembly having a longitudinal axis and comprising: a. a single piece endless track defining a ground engaging run, the ground engaging run having: i. first and second lateral edges and an outer ground engaging face extending between the first and second lateral edges, the outer ground engaging face defining a surface that is continuous and uninterrupted over its extent; ii. an inner face including: a. a track guide projecting inwardly from the inner face, the track guide being located between the first and second lateral edges; b. a first generally flat and horizontal support wheel engaging surface extending between the first lateral edge and the track guide, the first support wheel engaging surface being continuous and uninterrupted over its extent; c. a second generally flat and horizontal support wheel engaging surface extending between the second lateral edge and the track guide, the second support wheel engaging surface being continuous and uninterrupted over its extent; d. the first support wheel engaging surface and the second support wheel engaging surface being generally co-planar and being generally parallel to the outer ground engaging face, the track guide having a tip portion vertically inwardly spaced apart from the first support wheel engaging surface and from the second support wheel engaging surface; b. a support wheel arrangement engaging the ground engaging run, the support wheel arrangement including: i. a first support wheel mounted for rotation about a first axis that is generally transverse to the longitudinal axis of the track assembly, the first support wheel having a generally cylindrical peripheral surface that is in rolling contact with the first support wheel engaging surface, the first support wheel engaging surface being characterized by a width, the generally cylindrical peripheral surface of the first support wheel extending over a major portion of the width of the first support wheel engaging surface; ii. a second support wheel mounted for rotation about a second axis which is parallel to the first axis, the second support wheel having a generally cylindrical peripheral surface that is in rolling contact with the second support wheel engaging surface, the second support wheel engaging surface being characterized by a width, the generally cylindrical peripheral surface of the second support wheel extending over a major portion of the width of the second support wheel engaging surface; iii. the first and second support wheels being spaced apart to define therebetween a void area for receiving the track guide; c. the first support wheel and the second support wheel being mounted for pivotal movement via a pivot structure about a third axis which is generally perpendicular to the first axis and to the second axis, the third axis being vertically spaced apart in an inward direction from the tip portion of the track guide.