| 摘要 |
<p>The positively driven steering member for conveying apparatus has a wheel (20) with a sphericaliy curved inner surface, a hub (10) with a spherically curved outer surface which fits inside of the wheel (20), and a coupling which secures the wheel to the hub, permitting the axis of the wheel to be rotated relative to the axis of the hub in any direction while restraining relative motion between the wheel and hub about the axis of the hub. This arrangement provides that, when the hub (10) is driven by a shaft (14) passing through its axis, it drives the wheel, regardless of the angle between the hub and wheel.</p> |
