| 摘要 |
PROBLEM TO BE SOLVED: To expand the maximum work range of a workbench and allow the work at a narrow place without shortening a boom, setting it into many stages, or changing the size of the workbench. SOLUTION: The position of the workbench can be adjusted according to displacement by displacing the turning center of the nearly rectangular workbench from the nearly center line of the workbench. The expansion of a work feasible area and the work at a narrow place are allowed without causing a weight increase and a cost increase.
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