Title:
FASTENER
Document Type and Number:
Japanese Patent JP2023181155
Kind Code:
A
Abstract:
To inhibit loosening of a nut threadedly engaged with a bolt.SOLUTION: In the invention, at a fastener 1 comprising a bolt 2 and nuts 3, 4, a first screw part 9 for threadedly engaging with the first nut 3 is formed at a base end part (a head) side of the bolt 2 and a second screw part 10 for threadedly engaging with the second nut 4 is formed at a tip tool side of the bolt 2. A nominal diameter of the second screw part 10 is set so as to be smaller than a root diameter of the first screw part 9. Further, a spiral direction of the second screw part 1 is set to be opposite to that of the first screw part 9 and the first nut 3 and the second nut 4 are connected by a connection tool 5. Furthermore, an external size of the second nut 4 is set so as to be the same as an external size of the first nut 3 or smaller than the external size of the first nut 3. The connection tool 5 is formed with insertion holes 12, 13 which fit in the first and second nuts 3, 4. The fastener 1 is also provided with a fall prevention tool 6 for preventing fall of the connection tool 5.SELECTED DRAWING: Figure 1
Inventors:
NONAKA YOSHIMI
Application Number:
JP2023095926A
Publication Date:
December 21, 2023
Filing Date:
June 10, 2023
Export Citation:
Assignee:
NONAKA YOSHIMI
International Classes:
F16B35/00; F16B21/12; F16B37/04; F16B37/14; F16B39/30; F16B41/00
Attorney, Agent or Firm:
Sumiko Shimosaka
Masayoshi Furukawa
Masayoshi Furukawa
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