| 摘要 |
<p>An invalid hoist comprises a telescopic mast (11) having a lower part (18) and an upper part (19), power operated means for raising and lowering the upper part relative to the lower part, a lifting arm (12) pivotably connected to the upper part of the mast, the lifting arm having a sling hanger (23) or at least one sling attachment point at or adjacent to one end thereof, and a manually extendible/retractable stay (30) between the lifting arm and the lower mast part. The lifting arm is pivotally connected to the upper part of the mast at a position intermediate its ends and the extendible/retractable stay is connected to the lifting arm on the side of the pivotable connection between the lifting arm and the upper part of the mast remote from said one end of the lifting arm. The stay can be extended, if the power operated means fails with the upper part of the mast in a raised position, to lower a user to a position in which he/she can be released from a sling supported by the lifting arm. It can also be extended, when the upper mast part is in its lowermost position, to move the lifting arm to a storage position alongside the telescopic mast.</p> |
