Patent ID: 7904224

Claim:
A control-mode switching device of an excavator, comprising: a swing actuator that drives an upper swing body of the excavator; a boom actuator that drives a boom of the excavator; an arm actuator that drives an arm of the excavator; driving means for respectively driving the swing, boom and arm actuators; a swing control lever that commands movement of the swing actuator in accordance with its operation stroke; a boom control lever that commands movement of the boom actuator in accordance with its operation stroke; an arm control lever that commands movement of the arm actuator in accordance with its operation stroke; first detecting means for detecting arrival of the swing control lever to a proximity of ends of the control range of the swing control lever; second detecting means for detecting arrival of the boom control lever to a proximity of at least one end of the control range of the boom control lever; third detecting means for detecting arrival of the arm control lever to a proximity of at least one end of the control range of the arm control lever; mode judging means for judging whether or not the respective detecting means detect arrival of the respective control levers to the proximity of the ends of the respective control ranges, and for judging whether any one of a plurality of priority operation modes is taken or not based on a combination of judging results of the respective control levers; and drive controlling means for, when it is judged by the mode judging means that any one of the priority operation modes is taken, controlling the driving means so that the output of the selected one or more of the driving means becomes larger than that in the normal mode or the power ratio of the selected one or more of the driving means as compared to other driving means becomes larger.