| 摘要 |
PROBLEM TO BE SOLVED: To raise a work bench from a boom stored state using a vertical rise input, prevent a boom from extending even the boom comes in a depression angle during the storage so as to prevent the boom from interfering with a car body, and store the boom automatically even from the state of depression angle. SOLUTION: When an instruction to vertically lifting a work bench by the operation of a boom operating lever 27 is output in the state that the tip part of a boom 14 is positioned lower than a horizontal plane including a foot pin, a controller 40 operates both cylinders 18 and 17 so that the boom 14 is raised and lowered in the state of being held in fully retracted condition until the tip part of the boom 14 is raised to a specified height (For example, height of horizontal plane including the foot pin) irrespective of whether or not the tip part of the boom 14 draws a vertical linear trajectory.
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