| 摘要 |
PROBLEM TO BE SOLVED: To improve assembling performance and disassembling performance while maintaining the performance of a machine without greatly changing dimensions of a boom. SOLUTION: A main boom 4 is connected to an upper structure 3 (a construction machinery body) in such a manner as to be freely raised and brought down. A front boom 6 is rotatably connected to the main boom 4. An arm 7 is rotatably connected to the front boom 6, and a tip attachment is attached to the tip of an arm 7. The front boom 6 is rotated by expanding and contracting a jib cylinder 12. The side of a tube 12a of the jib cylinder 12 is connected to the front boom 6, and the side of a rod 12b is connected to the main boom 4. COPYRIGHT: (C)2009,JPO&INPIT
|
