| 摘要 |
<p>A mobile invalid hoist comprises a non-rectilinear lifting arm 12 pivotably connected about first horizontal axis W to the upper end of mast 11, a housing 23 pivotably connected about second horizontal axis X to one end of the lifting arm 12 and supporting a vertical bearing 24, a sling hanger support 25 pivotably supported about a vertical or substantially vertical axis Y by the bearing 24, and a sling hanger 26 pivotably supported about a third horizontal axis Z by the sling hanger support 25. A flexible elongate element 27 is connected between the mast 11 and housing 23, and is guided through the lifting arm 12 to effectively form with the lifting arm 12 a parallelogram linkage. Thus, as the lifting arm 12 pivots, the housing 23 pivots in relation to the lifting arm 12 and the bearing 24 is kept vertical or substantially vertical. <IMAGE></p> |
