| 摘要 |
PROBLEM TO BE SOLVED: To obtain a space enough to arrange a key on the side of a holder blade, by extending, from an upper jaw, a projecting part for enlarging the interval between the upper jaw and a lower jaw by elastic deformation of the upper jaw. SOLUTION: When a displacement thread 52 is tightened, the width of a slot 47 is reduced, and a lever 50 is displaced backward, and a backward force is given to a projecting part 36 of an upper jaw 20. On the other hand, as a rear projection 46 is contacted to the front end of a hollow 54 of a blade holding block 12, reaction by the rear projection 46 is given to the lever 50. When the lever 50 is moved backward, the interval between clamp faces 28, 30, and an insert pocket 18 is opened. If the insert is once removed or inserted, the displacement thread 52 may be loosened. Hereby, the lever 50 is returned to the former position and separated from the projecting part 36, and the insert pocket 18 is closed by elasticity of the upper jaw 20. |
