| 摘要 |
PROBLEM TO BE SOLVED: To stop the loosening of a screw securely in a simple work. SOLUTION: Recesses 12 are formed on the inner periphery of a female screw 11 by extending in the longitudinal direction, while whirl-stop parts 24 are formed to a male screw 22. A whirl-stop member 30 is inserted in the recess in the screwed condition of the female screw and the male screw, and the whirl- stop member 30 is held at the recess 12 and it is interferred with the whirl-stop parts 24 when the female and the mail screws are rotated in the loosening direction. Instead of the whirl-stop member 30, the earth and sand may be used.
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