Patent ID: 7445240

Claim:
A drive device of work hydraulic cylinders, comprising: a hydraulic source; at least a plurality of work hydraulic cylinders of a single type, that are to be driven with pressure oil from the hydraulic source; a control valve that controls a flow of pressure oil from the hydraulic source to the work hydraulic cylinders; an operating device that issues a command for drive of the control valve; a selector switch that selects at least an independent operation of the work hydraulic cylinders; and a pressure oil control device that allows the pressure oil to flow to a work hydraulic cylinder selected with the selector switch and disallowing flow of pressure oil to other work hydraulic cylinders; wherein at least one of the work hydraulic cylinders selected with the selector switch is driven in response to the command issued from the operating device, after the pressure oil is allowed to flow to the at least one of the work hydraulic cylinders selected, by the pressure oil control device.