| 摘要 |
The wheel assembly comprises first and second support wheels sepd. from one another vertically and which are located against the side of the column facing the cage. Also incorporated is a third wheel fitted on an outrigger projecting outwards from the cage, and which locates against the opposite side of the column. It is also fitted at a level above the uppermost of the first and second wheels. The lift comprises a telfer, relatively to which is a winchable chain fitted to the outrigger in the area of the third |
