Title:
SCREW FASTENING STRUCTURE WITH LOCKING FUNCTION
Document Type and Number:
WIPO Patent Application WO/2020/045046
Kind Code:
A1
Abstract:
Provided is a novel screw fastening structure with a locking function. The screw fastening structure includes a first screw element 11 and a second screw element 12 which is screwed and fastened to the first screw element 11. One of the first and second screw elements has an engagement recessed part R which is opened toward the other side, and the other screw element has an engagement projecting part P which is inserted in the engagement recessed part R in a fastened state. The engagement recessed part R has an inner circumferential surface extending straight along the axial direction so as to have a cylindrical shape. The engagement projecting part P is formed in a columnar shape or a cylindrical shape so as to have a maximum-diameter section at one location in the axial direction. The maximum-diameter section of the engagement projecting part P and the inner circumferential surface of the engagement recessed part R are eccentric relative to each other so as to be in pressure contact with each other only at portions thereof in the circumferential direction in the fastened state. The maximum-diameter section of the engagement projecting part P is located at a predetermined distance from the proximal end of the engagement projecting part P such that the engagement projecting part P can advance and retreat in the axial direction with respect to the engagement recessed part R in a state where the maximum-diameter section is in pressure contact with the inner circumferential surface of the engagement recessed part R only at the portions in the circumferential direction.
Inventors:
WAKABAYASHI KATSUHIKO (JP)
Application Number:
PCT/JP2019/031567
Publication Date:
March 05, 2020
Filing Date:
August 09, 2019
Export Citation:
Assignee:
HARDLOCK IND CO LTD (JP)
International Classes:
F16B39/284; A61C8/00; F16B39/28
Domestic Patent References:
| WO2016111312A1 | 2016-07-14 |
Foreign References:
| JP2012110922A | 2012-06-14 | |||
| JPH1037936A | 1998-02-13 | |||
| JPH09236109A | 1997-09-09 |
Other References:
See also references of EP 3845768A4
Attorney, Agent or Firm:
UEBA Hidetoshi et al. (JP)
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