| 摘要 |
PROBLEM TO BE SOLVED: To prevent the elongating operation of a work device cylinder during the assembly/disassembly/carriage of a work attachment.SOLUTION: A dogleg-shaped fixed link 33 is turnably mounted at the front end of an arm 24. A force point portion 33b of the fixed link 33 is connected to a main link 29 of a link mechanism 28, while a working point portion 33c thereof is provided with a rotation preventive pin 36. During the assembly/disassembly/carriage of the work attachment when a work device cylinder 27 intends to perform elongating operation with the pressure relief of a pipe for the cylinder 27, the rotation preventive pin 36 is put in contact with the upper face of the arm to prevent the elongation of the cylinder 27. |
