| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a screw that is hardly loosened and can easily, surely and be repeatedly used by normal fastening work. <P>SOLUTION: The screw that is hardly loosened easily used in fastening work is formed of screw parts of a pre-decentered screw part X, an intermediate screw part Z, and an post-decentered screw part Y and arranged so that the pre-decentered screw part X and the post-decentered screw part Y are decentered in the intermediate screw part Z by a size E, the pre-decentered screw part X and the post-decentered screw part Y are parallel, and a screw of the intermediate screw part Z connected to the pre-decentered screw part X and the post-decentered screw part Y continues at the same pitch. <P>COPYRIGHT: (C)2013,JPO&INPIT |
