| 摘要 |
<P>PROBLEM TO BE SOLVED: To securely stop loosening by engaging and fixing, when a screw for fastening by screwing is fastened. <P>SOLUTION: In a fastening screw 10 for fastening a member to be fastened, a thread angle θ of a thread 12b of the fastening screw 10 is made smaller as it goes from a neck 12c to a screw tip 12d, an outer diameter H10 of the thread 12b is made larger as it goes from the neck 12c to the screw tip 12d, and a volume of the thread 12b is made same from the neck 12c to the screw tip 12d. In another way, the thread angle θ of the thread 12b of the fastening screw 10 is made larger as it goes from the neck to the screw tip 12d, a valley diameter H10 of the convex 12b is made larger as it goes from the neck 12c to the screw tip 12d, and the volume of the thread 12b is made same from the neck 12c to the screw tip 12d. <P>COPYRIGHT: (C)2012,JPO&INPIT |
