Title:
ねじ体設計方法
Document Type and Number:
Japanese Patent JP6766929
Kind Code:
B2
Abstract:
To keep a fastening force at a high level at a male screw body, for example, that is formed under overlapped state of two kinds of helical grooves of which lead angle and/or lead direction are different from each other.SOLUTION: A male screw body 10 comprises a shank part 12, a first helical groove 14 formed at a peripheral surface of the shank part 12 and set at an appropriate lead angle and/or a lead direction and a second helical groove 15 set at a lead angle and/or a lead direction of which lead angle and/or lead direction are different from that of said first helical groove 14, and a thread angle formed by a pair of slant surfaces extending from a top part of a screw thread G created by overlapped formation of the first helical groove 14 and the second helical groove 15 toward its valley is set to 61° or more and 75° or less.SELECTED DRAWING: Figure 9
More Like This:
| WO/1992/007197 | PLASTIC SCREW ACCESSORY |
| JPH0751966 | [Title of Invention] Loosening Prevention Device for Bolts and Nuts |
| WO/2006/134626 | BOLT |
Inventors:
Yutaka Michiwaki
Application Number:
JP2019144116A
Publication Date:
October 14, 2020
Filing Date:
August 06, 2019
Export Citation:
Assignee:
Nejilaw Co., Ltd.
International Classes:
F16B35/00; F16B37/00
Domestic Patent References:
| JP5135846A |
Foreign References:
| WO2009104767A1 |