| 摘要 |
PROBLEM TO BE SOLVED: To provide a dropping-out prevention tool capable of preventing dropping out of a screw by attaching from one surface of a fastening member.SOLUTION: The dropping-out prevention tool 4 has an insertion section 41, a flange section 43 wherein its diameter is enlarged rather than the insertion section 41, and a through-hole 44 penetrating these sections in the axial direction. A projection 45 projecting from a flat side face section 41b to its outer peripheral side is formed on the insertion section 41, and it is deformable so as to shorten its separating distance to the flat side face section 41b. The prevention tool 4 is divided into a first section 50 and a second section 60 by first and second crossed sections 51, 61 extending in the axial direction. A press-fitted projecting section 52 projecting toward the second section 60 and a fitted projecting section 53 located at a lower face 4b side rather than the press-fitted projecting section are formed on the first crossed section 51 of the first section 50. A press-fitted recessed section 62 capable of press-fitting to the press-fitted projecting section 52 and a fitted recessed section 63 capable of fitting to the fitted projecting section 53 are formed on the second crossed section 61 of the second section 60. |
