| 摘要 |
PROBLEM TO BE SOLVED: To provide a tinker prevention screw capable of preventing connection by a conventional general screw driver to certainly prevent the bolting work, to provide a screw driver bit capable of easily and rapidly accomplishing connection to the screw and certainly preventing a come-out phenomenon in the bolting work, and to provide a header punch capable of simply and easily manufacturing the tinker prevention screw at low cost. SOLUTION: In this tinker prevention screw 10A, a slant part 15 is formed such that the slant part 15 is oriented toward a center part of a screw neck part 10b from an opening end edge part 12a of a bit fitting groove of a screw head part 10a, a middle part of the slant part 15 is formed with step parts 14, and a cross center part of the slant part 15 is formed with a conical bottom face 13. In the tinker prevention screw 10A, the opening end edge part 12a of the bit fitting groove is set to a maximum diameter, and reverse conical frustum-shaped hole part 16 continuing from the slant part 15 except the step parts 14 to the bottom face 13 is formed. The screw driver bit adapts to the tinker prevention screw 10A, and the header punch manufactures the tinker prevention screw 10A. COPYRIGHT: (C)2004,JPO
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