| 摘要 |
Apparatus for positioning an object includes a fixed vertical frame and a carriage to support the object. The carriage includes a first end with rollers to engage the frame and a second end with a bearing to engage a floor or other surface. Also at the second end is a gate which can be moved from a position wherein it is parallel to said carriage to a position wherein it is perpendicular to said carriage. A drive operates a cable linkage to move the first end of the carriage along the frame and to rotate driven wheels in the bearing to move the carriage between vertical and horizontal positions.
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