| 摘要 |
Each of the saddle-shaped supports (1,2) is movable up and down in relation to a displaceable lower formation. Each saddle is supported by a manually operated hydraulic lifting device (5). The saddle is directed along an upright straight guide. Each saddle-shaped support is formed with two spaced apart upright stirrup-shaped supports. The lower formation is provided with three or more pivot wheels (8). Each hydraulic lifting device is mounted on a common under plate (7) of a sub-frame, which on the under side is provided with running wheels (8), preferably four in the angle of the right-angled under plate (7).
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