Title:
ANTI-LOOSENING BOLT
Document Type and Number:
WIPO Patent Application WO/2022/145078
Kind Code:
A1
Abstract:
[Problem] To provide an anti-loosening bolt having excellent fastening workability. [Solution] An anti-loosening bolt according to the present disclosure has a screw shaft 1 having an outer circumferential surface on which a male screw thread 2 is formed so as to screw with a tapped hole having a female screw thread. The male screw thread 2 has an R screw thread part 21 that is positioned at the middle part in the axial direction of the screw shaft 1, a tip-end-side screw thread part 22 that is positioned closer to the tip-end side in the axial direction than is the R screw thread part 21, and a base-end-side screw thread part 23 that is positioned closer to the base-end side in the axial direction than is the R screw thread part 21. At least one of the compression-side flank surface and the clearance-side flank surface of the R screw thread part 21 has a convex flank surface part having a convex arc shape in the cross section along the axial direction, so as to eliminate clearance with respect to the female screw thread. The convex flank surface part is formed in a continuous spiral at least over one pitch of the male screw thread. Neither the tip-end-side screw thread part 22 nor the base-end-side screw thread part 23 has the convex flank surface part.
Inventors:
WAKABAYASHI KATSUHIKO (JP)
Application Number:
PCT/JP2021/024863
Publication Date:
July 07, 2022
Filing Date:
June 30, 2021
Export Citation:
Assignee:
HARDLOCK IND CO LTD (JP)
International Classes:
F16B33/02; F16B39/30
Foreign References:
| JP2012013133A | 2012-01-19 | |||
| JP2001512807A | 2001-08-28 | |||
| JP2019113156A | 2019-07-11 | |||
| JP2018100765A | 2018-06-28 | |||
| JP2015137700A | 2015-07-30 | |||
| JP2013543962A | 2013-12-09 | |||
| JP2008151346A | 2008-07-03 | |||
| JP2014206234A | 2014-10-30 |
Attorney, Agent or Firm:
UEBA, Hidetoshi et al. (JP)
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