| 摘要 |
<p>A support for a caster has a fixing plate (12) and a forked support member (14a) for rotatably attaching the caster to the plate (12) with the interposition of two rings of balls (22, 32), the rings having different diameters and the balls (32) of one ring having a smaller diameter than the balls (22) of the other ring.</p> |
