| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw to prevent unlocking making impossible to engage into an engaging groove by a commercial-type screwdriver bit, thereby making impossible to easily remove a part. SOLUTION: This screw, having a head and a shank, forms the engaging groove 12 in the radial direction and a connecting wall 16. The connecting wall 16, to which a guide wall 23 formed between the driving claw of the screwdriver bit contacts, is formed between the driving wall 14 and the rear wall 15 that are adjacent to each other in the engaging groove 12. A driving part 10 has the engaging groove 12 and a guide groove 11. Accordingly, since this screw to prevent from unlocking forms a blocking member 13 in the guide groove, the commercial-type screwdriver bit can not easily unlock it. Furthermore, since the screw mounting the part can not be unlocked and removed easily, the part is difficult to breakdown so that it can not be repaired and disassembled freely. The screw reduces unexpected accident and danger.
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