| 摘要 |
<p>The ball wheel has three ball segments (1,2,3), which are connected with an axis in the polar axis orthogonal to the intersection of the ball segment. The axis is connected with circular support plates (5), which are arranged centrally in the intersections between the ball segments. The circular support plates have a small diameter than the adjacent ball segments and project at two opposite sides over the periphery of the adjacent ball segments.</p> |
