| 摘要 |
<p>PURPOSE:To relief the need for manual operation as well as adjust the driving speed of a working machine by using a system in which one of two direction switching valves through which pressure oil is supplied from two oil-pressure motors to an actuator or discharged or vice or versa is operated by a pedal and the other is operated manually. CONSTITUTION:In a mechanism by which to speed up an arm cylinder in an oil-pressure shovel, when the arm cylinder 5 is driven, any one of a manual operation portion 6 and a pedal operation portion 13 is operated in case where no great driving force is needed and the speed-up of driving speed is not required, and on the contrary, in case where great driving force is needed and also speed-up of the driving speed is needed, both the manual operation portion 6 and the pedal operation portion 13 are concurrently operated by a manner that the direction switching valve 3a contained in the first control mechanism 2a is connected to the manual operation portion 6, the direction switching valve 4a contained in the second control mechanism 2b is connected to the foot-stepping pedal operation 13, and the oils of two oil-pressure motors 1a and 1b are joined.</p> |
