| 摘要 |
PROBLEM TO BE SOLVED: To prevent a nut from being erroneously dropped when the nut is engaged in thread with a bolt.SOLUTION: A nut guiding part 40 that can be freely inserted into or removed from a female thread hole 61 of a nut 60 is protruded in an axial direction at the extremity end of a male thread part 22 of a bolt main body 20 so as to constitute a bolt 24 with the nut guiding part. One end of a nut main body 64 at a top surface side of the female thread hole 61 is closed and a pressing contact member 100 composed of an elastic member is removably installed to constitute the nut 60. The pressing contact member 100 is provided with a through-pass port 101 and a length of the nut guiding part 40 is made longer than a height from an end surface 63 at a bottom surface side of the nut 60 to the through-pass port 101. The through-pass port 101 of the pressing contact member 100, when the nut 60 is inserted from the bottom surface side to the nut guiding part 40, the through-pass port 101 is pushed to be opened by the nut guiding part 40 and contacted in press to the nut guiding part 40 before the bottom surface side of the female thread hole 61 of the nut 60 abuts against the male thread part 22 of the bolt main body 20.SELECTED DRAWING: Figure 5 |
