| 摘要 |
PURPOSE:To enable a click body to be turned with a high speed while reducing the weight of the click body by forming a hollow part in a trunk part of the click body. CONSTITUTION:A hollow part 7 is frmed in the trunk part 41 of a click body 4, and thereby the weight of the click body is considerably lightened as compared with that of a solid click, allowing a chuck to which two or four click bodies are attaced to be considerably lightened. Further, the hollow part 7 of the click body 4 is formed at a rear position, separated by a prescribed distance L1 from a grasping portion 11 of the click body, so that upon attaching the click to the chuck, a portion located outside the center of the chuck body 1 is lightened by an amount corresponding to the hollow part, enabling the chuck to be satisfactorily balanced and to be turned with a high speed. |
