| 摘要 |
PURPOSE: A device for automatically controlling a horizon of a bucket is provided to easily work with a worker by automatically maintaining the horizon of the bucket without controlling a bucket cylinder and to be operated with a simple operation. CONSTITUTION: When a falling hydraulic pressure is flowed in a second hydraulic chamber(19) of a boom cylinder hydraulic controlling device through a falling hydraulic line(17), the second hydraulic chamber(19) is enlarged according to the flowing of the hydraulic pressure into the second hydraulic chamber(19), a hydraulic pressure of a first hydraulic chamber(15) is flowed out to a rising hydraulic line during operating the hydraulic pressure into an outer piston(21), a third hydraulic chamber(29) is reduced during moving a hollowed rod(11) to the other direction and a hydraulic pressure of the third hydraulic chamber(29) is flowed out to a control hydraulic line(27) through a first hydraulic passage(25). A fifth hydraulic chamber(37) is enlarged during flowing the hydraulic pressure flowed out the control hydraulic line(27) into the fifth hydraulic chamber(37), a fourth hydraulic chamber(35) is reduced during moving the piston(41) to the other direction and a hydraulic pressure of the fourth hydraulic chamber(35) is flowed out to the rising hydraulic line(13). Thereby a bucket(5) is automatically controlled in a horizontal state by controlling the hydraulic pressure flowed in/flowed out the rising hydraulic line(13) or the falling hydraulic line(17) when a boom bar(3) is risen or fallen.
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