Title:
ナット部材および専用工具
Document Type and Number:
Japanese Patent JP7274921
Kind Code:
B2
Abstract:
To realize a nut member and a specialized tool capable of further preventing looseness to further enhance a crime prevention effect.SOLUTION: A bottom surface 21, a top surface 22 and a tapered surface 23 of a nut body 20 form a truncated cone shape. Even when the tapered surface 23 is held by a tool, the tool slips, so it is difficult to rotate the nut body 20. A protrusion 26 is formed along a circumferential direction on an outer peripheral surface 24a of a base part 24 protruding from the bottom surface 21, and an annular member 30 is rotatably fitted to the protrusion 26. The nut body 20 does not rotate even when the annular member 30 is held and rotated by the tool.SELECTED DRAWING: Figure 1
Inventors:
Toshikazu Nakajima
Satoshi Aoyama
Satoshi Aoyama
Application Number:
JP2019077950A
Publication Date:
May 17, 2023
Filing Date:
April 16, 2019
Export Citation:
Assignee:
Nakajima Special Steel Co., Ltd.
Satoshi Aoyama
Satoshi Aoyama
International Classes:
F16B41/00; B25B13/48; B25B13/54; F16B23/00; F16B37/00; F16B43/00
Domestic Patent References:
| JP3175390U | ||||
| JP2018003974A | ||||
| JP2000035027A |
Foreign References:
| US20140105704 |
Attorney, Agent or Firm:
Youichi Kumazaki
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