| 摘要 |
PURPOSE:To prevent a reduction in torque by a cylinder by connecting a rotating arm which rotates a lift arm and a rod of the hydraulic cylinder through a link, and abutting the link to a stepped part of the rotating arm to change the operating angle. CONSTITUTION:A rotating arm 17 which rotates a lift arm is connected to a rod of a hydraulic cylinder 20 through a link 18. The rotating arm is formed with a stepped part 22 which is slightly larger than a half of the width (W) of the link 18 and is cut out with a desired angle in relation to a line passing through respective centers of rotating shaft 16 and pin 19. Within a range of a swing angle acute angleX'D'Y' necessary for reising and lowering a gate plte, the rod of the cylinder 20 moves with the centers of the pins 19, 21, 23 aligned on a straight line. In such a case, the pin 19 works as a crank pin. Within a range of a swing angle acute angleY'D'Y'' necessary for inclining the gate plate 13, the arm 17 is swung as a side of the link 17 is abutting to said stepped part, and the pin 21 works as a crank pin. |
