| 摘要 |
A drivable undercarriage for a wheelchair comprises front wheels (24), primary big detachable rear wheels (14) and secondary, small rear wheels (22) attached to the undercarriage frame (10) by wheel supports (34). The rear wheels (22) have an idle position when the big rear wheels (14) are in their driving position, and an active position when the big rear wheels (14) are detached. To make the big wheels (14) unloaded during the detaching/re-attaching and thus favour these working operations, the distance (H + h1) between and essentially horizontal plane through the central longitudinal axis of the undercarriage frame (10) and the outermost, lowermost peripheral point (22') of the path of rotation of the respective, secondary rear wheel (22) in its active driving position, exceeds the corresponding distance (H) of each of the other big rear wheels (14) in their active driving position (Fig. 1). |
