| 摘要 |
The invention consists in transmitting forces between the actuating member 3-4 and the slides 9-9' to which the platform is fixed and which slide along the vertical columns 1-1' by means of two chains 7-7', each one of which is substantially located, over its entire length, on one and the same vertical plane, being guided by a return pulley 12-16 mounted on the end of the corresponding column 1-1' and located on this same plane. <IMAGE>
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