| 摘要 |
A mechanical lifting device is the subject of the present invention. The device includes a framework which may be easily collapsed or assembled and comprises a plurality of tubular pieces which are held in place by bolts utilized as set screws. Two upright spaced apart frame sections support two spaced apart support bars and a gear rack and lever are employed to effect movement of the support bars. A platform may be mounted on the support bars to provide a scaffold. The platform may also be removed and the support bars positioned over a load to lift it straight upwardly.
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