| 摘要 |
PROBLEM TO BE SOLVED: To form a frame having enough rigidity as a support structure so as to adapt to both the attachment interval of a working device and the attachment interval of a counter weight.SOLUTION: A left longitudinal plate 14 is divided into a front longitudinal plate 15 and a rear longitudinal plate 16 at a halfway portion of a bending part 14A in its anteroposterior direction. A left-pointing front bending plate part 15B is provided on the rear side of the front longitudinal plate 15, and a right-pointing rear bending plate part 16A is provided on the front side of the rear longitudinal plate 16. By fixing the front bending plate part 15B of the front longitudinal plate 15 to the rear bending plate part 16A of the rear longitudinal plate 16, the left longitudinal plate 14 is formed wherein the halfway portion corresponds to bending part 14A. By this, even if the working device 5 is disposed on one side, counter weight attachment parts 16C, 17B for each of the longitudinal plates 16, 17 can be disposed evenly in a right-and-left direction with respect to the gravity center of the counter weight. |
