Title:
DUAL-THREAD STRUCTURE AND FASTENER FOR SAME
Document Type and Number:
WIPO Patent Application WO/2019/230167
Kind Code:
A1
Abstract:
Provided is a dual-thread structure having one or more threads of the two types of threads of a first thread (S1) and a second thread (S2) formed on a screw shaft, the second thread (S2) having a larger lead than the first thread (S1), wherein a high loosening prevention effect can be obtained when the dual-thread structure is fastened with a double nut. In a dual-thread structure according to an exemplary embodiment of the present invention, the valley diameters between second small thread peaks rs, rs1-rs6 are formed larger than the effective diameter d of the first thread (S1) by 10% of the height H of sharp peaks. In this case, the inner diameter of the female thread of a second nut 830, which is a loosening prevention nut, is also formed larger than the effective diameter d of the first thread (S1) by 10% of the height H of the sharp peaks.
Inventors:
SHINBUTSU TOSHINAKA (JP)
TAKEMASU TERUIE (JP)
AMANO SHUICHI (JP)
TAKEMASU TERUIE (JP)
AMANO SHUICHI (JP)
Application Number:
PCT/JP2019/013175
Publication Date:
December 05, 2019
Filing Date:
March 27, 2019
Export Citation:
Assignee:
FORM ROLL TECH CO LTD (JP)
International Classes:
F16B39/30; F16B35/00
Domestic Patent References:
| WO2016194842A1 | 2016-12-08 | |||
| WO2016194842A1 | 2016-12-08 |
Foreign References:
| JP2006189056A | 2006-07-20 | |||
| JP2018080819A | 2018-05-24 | |||
| JPS638121A | 1988-01-13 |
Other References:
See also references of EP 3805582A4
Attorney, Agent or Firm:
TOMISAKI Motonari et al. (JP)
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