| 摘要 |
PROBLEM TO BE SOLVED: To reduce looseness in a simple shape by providing a fixture formed by a shaft pin having a boss part conically expanded from a male screw part, plural rings which are loosely fitted to the pin, have a discontinuous part and abut on each other, and a nut screw-engaged with the male screw. SOLUTION: Three rings 5 are fitted to a shaft pin 3 to abut on a boss part 2, they are forced into an undercut bored hole 14 of a building material, and when a pipe-like push-in jig 17 having an inside diameter larger than the male screw part 1 and an outside diameter smaller than an inlet of the hole 14 is pushed in toward the bottom of the hole by screw-engagement of a nut 6 and the male screw part 1, each ring 5 having a discontinuous part 4 is expanded by the conically expanded boss part 2. Since the ring 5-A is not expanded largely, it abuts on the substantially whole periphery of the lower peripheral surface of the hole 14 to prevent slip-off of the rings 5-B, 5-C. The ring 5-B abuts on the upper peripheral surface of the undercut hole to prevent slip-off of the pin 3, and the ring 5-C abuts on the peripheral surface of the bottom of the undercut hole to prevent slip-off of the pin 3 and prevent three- dimensional looseness.
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