| 摘要 |
PURPOSE:To allow a great cylindrical force by a method in which blades are supported by four brackets so that they are stabilized even when burdened with biased loads, and the blades are operated by two cylinders. CONSTITUTION:Angling action to produce difference in the front and back directions at the left and right-handed ends of a blade 8 is obtained by extending one of oil-pressure cylinders 11 and 11' and by pulling into the other. Also, tilting action to produce differences in the vertical direction at the left and right- handed ends of the blade 8 is obtained by extending one of oil-pressure cylinders 12 and 12' and by pulling in the other. The vertical moving action of the blade 8 is also obtained by extending or pulling in oil-pressure cylinders 13 and 13' concurrently. Since the blade 8 is supported at four points of the brackets 9, 9', 10, and 10', the blade 8 is stabilized even when burdened with biased loads, and great cylindrical force can be generated by two oil-pressure cylinders 12 and 12'. |
