| 摘要 |
<p>A wheel (10) having a one piece main body (12), which includes a hub portion (13) rotatable about a primary axis of rotation and a rim portion (14). The main body (12) has two groups of mounting recesses (16, 18) therein, the groups of recesses (16, 18) being disposed in two generally parallel spaced apart planes with respect to the direction of the primary axis, the recesses (16, 18) in each group being circumferentially spaced apart and disposed in the region of the rim portion (14) and on opposite sides of the main body (12). The wheel (10) further includes a plurality of rollers (20, 22) arranged in two groups each roller (20, 22) being associated with a respective one of the mounting recesses (16, 18), each roller (20, 22) having axles at each end and being rotatable about a respective roller axis which extends generally transverse of the primary axis. Each roller (20, 22) is partially received within a respective mounting recess (16, 18) and in the mounted position projecting beyond the outer surface of the rim portion (14) of the main body (12), the axles being located in axle slots (21) at each end of each recess (16, 18).</p> |
