| 摘要 |
PROBLEM TO BE SOLVED: To provide the improved structure of a wrench fitting part for preventing a slip in the screwing motion of a nut. SOLUTION: A width between circular arc projecting faces 24 of the inner edge of the wrench fitting part 22 fitted to the nut is reduced, and the width between two circular arc projecting faces is made smaller than the width of an angular part storage opening recessed part 23 to form inwardly recessed shape. With the circular arc projecting faces structured to have inwardly recessed shape, two circular arc projecting faces are fitted to clamp the nut to be fitted to them in a position near the angular part. A contact fixing area with a nut face is thereby increased to prevent the occurrence of unnecessary idle turning in the screwing motion of the nut. This structure is therefore advantageous in use in a narrow space. COPYRIGHT: (C)2005,JPO&NCIPI
|
