| 摘要 |
The present invention includes a hydraulic source ( 28 ), at least a plurality of work hydraulic cylinders ( 11 ) of a single type, that are to be driven with pressure oil from the hydraulic source ( 28 ), a control valve ( 22 ) that controls a flow of pressure oil from the hydraulic source ( 28 ) to the work hydraulic cylinders ( 11 ), an operating means for ( 26 ) issuing a command for drive of the control valve ( 22 ), a selector switch ( 41, 42 ) that selects at least an independent operation of the work hydraulic cylinders ( 11 ), and a pressure oil control means ( 12 a, 12 b, 34 to 37 ) for allowing the pressure oil to flow to a work hydraulic cylinder ( 11 ) selected with the selector switch ( 41, 42 ) and disallowing flow of pressure oil to other work hydraulic cylinders ( 11 ).
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