| 摘要 |
PURPOSE:To make the fixing and adjustment of an angle adjusting plate easy, by providing a split groove for an arm metal having a cone type taper with male screws at the front tip and disposing the angle adjusting plate in this split groove. CONSTITUTION:A guide 21 is provided at the tip of an arm metal 20 and a split groove 22 is provided longitudinally from the center to the front tip. An angle adjusting plate 23 of sectorial type is fitted freely rotatably to a shaft 24 at the depth of the split groove 22. The front tip of the arm metal 20 constitutes a cone type taper 26 with thinned tip and a male screw 27 is formed at the external circumference of a taper 26. The inside of a push button 28 constitutes a cone shape recess corresponding to the taper 26 of the arm metal 20, and this recess forms a female screw. When the insertion between the recess and the taper 26 is loosened by turning the push button 28, the clearance of the split groove 22 is spread and the angle adjusting plate 23 becomes turnable. After adjusting the angle to a prescribed location, the push button 28 is turned reversingly, the clearance of the split groove 22 is narrowed and the plate 23 is fixed. |
