| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a plurality of hydraulic pipelines laid from being damaged or broken, etc., by friction and other causes by enabling an extra length of each hydraulic pipeline that is produced by the up-and-down movement of a boom to be always extended in a fixed direction. SOLUTION: In order for an extra length of each hydraulic pipeline that is produced on the back of a boom 10 by the movement of the boom 10 to be controlled so that it extends in a direction in which it separates from the back of the boom 10, a holding member 50 is provided for Fvolding all the hydraulic pipelines in parallel. Connecting rods 54 are provided in such a way as to be secured to both the right and left sides of the baseplate of the holding member 50, with the ends of the connecting rods 54 freely rotationally connected to brackets 55, 55 to which an arm cylinder 14 is pivotally attached, and by the movement of the boom 10 the holding member 50 holding the hydraulic pipelines can be rotated about the connection of the connecting rod 54 and the bracket 55 so as to be displaced in a direction for moving toward and away from the back of the boom 10.</p> |
