| 摘要 |
PROBLEM TO BE SOLVED: To provide an operating device of a construction machine that can assure an emergency operation function of an operating lever even if a signal line is disconnected. SOLUTION: In this operating device 32R having an operating lever 31R placed on a construction machine including a hydraulic pump 36, a hydraulic cylinder 20 for boom, a control valve 37 for controlling pressure oil to the cylinder 20, and electromagnetic proportional reducing pressure valves 38A and 38B for controlling pilot pressure to the valve 37, there are provided a rotary-type potentiometer 40A for outputting first and second operating volume signals Va and Vb that increase and decrease according to the operation volume of the lever 31R, a controller having a first calculation table 39a that can generate a first drive command signal Ia by the first signal Va and a second calculation table 39b that can generate a second drive command signal Ib by the second signal Vb and first and second signal lines 45a and 45b that transmit the first and second signals Va and Vb. COPYRIGHT: (C)2004,JPO
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