| 摘要 |
PROBLEM TO BE SOLVED: To increase the strength of the junction section between a riser member and a bottom plate section without increasing the weight of a cylinder bracket. SOLUTION: The cylinder bracket 30 comprises a box member 31 having a pair of side plate sections 33 that is opposingly arranged having a specific interval in the width direction of a boom 11 on the lower surface of the boom 11, is extended in the drawing direction of the boom while the upper end section is welded to the lower surface of the boom and is extended downward, and a bottom plate section 35 for connecting the lower end sections of the pair of side plate sections 33; the riser member 50 welded to a box member 31 so that an opening section 32 open to the side of the boom base section side is covered; and a boss plate 60 that is mounted to the boom base section side surface and the boom lower surface for extending up and down, and pivots one end section of a wave cylinder. An angleθ5 between an oblique side 33a and a contact side 33b in the side plate section 33 is equal to or more than 90 degrees and is an angle for allowing the drawing direction of the adjacent side 33b to cross the lower surface of the boom. The boom tip side end section of the cylinder bracket 30 is not adhered to the lower surface of the boom. COPYRIGHT: (C)2004,JPO
|
