| 摘要 |
PURPOSE:To improve the variable speed operability, by stopping the turning by the engagement between rollers, which are provided freely rotatably around the axial line in a striking guide, and longitudinal grooves which are formed to extend in the direction of the axial line of the striking rod. CONSTITUTION:A pair of longitudinal grooves are provided in positions, which face to each other in the direction of the diameter, in the expanded part of a striking rod 2, and rollers 11 as rotating materials are engaged with longitudinal grooves 10. Each roller is supported freely rotatably on a small-diameter inside end 13a of a pin 13 which is fixed to protrude partially in a guide 1. Thus, the position of the roller 11 in the direction of the axial line is fixed by the shoulder part between the small-diameter inside end 13a of the pin 13 and the rest large- diameter part and a snapping 14 engaged with the small-diameter inside end 13a. When a control lever 3 is operated around the axial line of the rod 2 in the direction of an arrow, this operation force is transmitted to the rod 2 through the rotation of the guide 1, and the rod 2 is rotated around the axial line. |
