| 摘要 |
PURPOSE: A crane is provided to save maximum capacity and maximum space for folding two crane arms together. CONSTITUTION: A crane comprises a first crane arm(11) and one or more second crane arms(12). The crane arms are connected by a joint(14). Until the horizontal axial line of a piston-cylinder unit(13) approaches to dead points to become materially in a row, the crane arms are rotated by a drive unit including a piston-cylinder unit. The piston-cylinder unit of the drive unit starts from one between two ends wherein the crane arms are parallel.
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