| 摘要 |
PURPOSE:To prevent the failure of centering work for a rotator by making the fitting and centering work of the rotator to a leader easier by a method in which an oil-pressure motor to turn the upper leader, a reduction gear and a bearing are integrated and attached to the lower leader. CONSTITUTION:The leader 2 of a pile driver is divided into the upper and lower leaders 2a and 2b, a leader rotator 3 is provided between the upper and lower leaders, and an oil-pressure motor 14c integrated with a fixed flange 14b is fixed to the upper end of the lower leader 2b. Also, a movable flange 14d is fixed to the lower end of the upper leader 2a. The output from the output shaft 14h of the oil-pressure motor 14c is transmitted through a reduction gear 14f to the movable flange 14d, and between the movable flange 14d and the fixed flange 14h is rotatably supported by a bearing 14g. By this, the centering work and positioning work of the leader are made easier. |
