| 摘要 |
PROBLEM TO BE SOLVED: To rationally protect the right and left angular sensors of a boom. SOLUTION: A first boom vertically moved around a first lateral axial center is forced to be supported at the side of the driving part in the revolving base, and a second boom 2B is forced to be supported in a state that a second boom 4B is forced to be supported in a state that the second boom 4B is laterally moved at the front end of the first boom, and a third boom 4c parallelly moved to the right and left in accordance with the lateral movement of the second boom 4B is provided at the tip of the second boom 4B and an arm moved back and forth is forced to support around the second lateral axial center, in the third boom 4C, and further, a bucket moved around the third lateral axial center is forced to support at the front end of the arm, and on the basis of the detected result of the vertical angular sensor of the boom, right and left angular sensor S2 of the boom, and a front and rear angular sensor detecting the front and rear angle against the third boom 4C, a restraint means preventing access closer than the preset figure against the moving part of the bucket against the above arm and further, the right and left angular sensor S2 of the boom are arranged between the right and left main plates 12 of the third boom 4C.
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