| 摘要 |
<P>PROBLEM TO BE SOLVED: To compactly and easily distribute hoses without increasing a boom cross section size or reducing the size of the hoses in a boom piping structure for distributing a plurality of the hoses in a U-turn shape over both proximal end and distal end booms of a telescopic boom. <P>SOLUTION: The total of four hoses folded in the U-turn shape over both proximal end and distal end booms 11 and 12 are divided into two sets of three hoses 17a... of a relatively small diameters and one large-diameter hose 17b, and the hoses of both sets are arranged with the mutually different minimum bend radiuses based on the respective maximum hose diameters and a 90° phase shift in a boom circumferential direction in the state of holding them by different hose supporting and guiding devices 19 and 20. <P>COPYRIGHT: (C)2012,JPO&INPIT |
