| 摘要 |
<p>A scaffolding floor 6 is provided on the upper ends of four expandable and contractible struts 1, 2. A support frame 8 protrudes downward from the scaffolding floor 6. One end of a line 12 is connected to the lower end of the support frame 8 and the other end of the line 12 is connected to the fixed part of a hydraulic jack 10 which is provided in the lower part of the struts 1, 2, so that the scaffolding floor 6 can be elevated or lowered through the line 12 in accordance with the raising or lowering of the hydraulic jack 10. <IMAGE></p> |
