| 摘要 |
A ball transfer unit support (220) including a top ring (226), an upper portion (222) adjacent to the top ring (226), a lower portion (224), and a shoulder (225) located between the upper portion (222) and the lower portion (224). The shoulder supports a ball transfer unit (230). The top ring (226) may be a truncated circle, and the top ring (226) may snap into an aperture (213) in a top skin (212) of a ball panel. The top ring (226) may include a retaining lip which snaps below the top skin (212). The truncated circle shape of the top ring (226) may provide anti-rotation between the ball transfer unit support (220) and the ball panel. |
