| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary hook hard to be broken even if an impact is applied from any direction. SOLUTION: The center lines of a hook rotary shaft 6 and an arm part 4 of the hook 1 are displaced from each other so that the rotating moment is generated around the hook rotary shaft 6 when an impact is applied to the arm part 4 and that the hook 1 is rotated to reduce a load to be applied to the arm part 4. COPYRIGHT: (C)2008,JPO&INPIT
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