Title:
MALE SCREW BODY, FEMALE SCREW BODY, SCREW BODY DESIGN METHOD, SCREW THREAD STRUCTURE
Document Type and Number:
WIPO Patent Application WO/2017/183593
Kind Code:
A1
Abstract:
A male screw body 10 that comprises, a shaft part 12, a first spiral groove 14 that is formed in a circumferential surface of the shaft part 12 and that is set at an appropriate lead angle and/or lead direction, and a second spiral groove 15 that is set at a lead angle and/or lead direction that is different from the lead angle and/or lead direction of the first spiral groove 14, wherein the thread angle formed by a pair of inclined surfaces that extend from the apex to the valley of a screw thread G that is created as a result of the first spiral groove 14 and the second spiral groove 15 being formed to overlap is established at 61°-75°. The present invention thereby makes it possible for a male screw body that comprises two types of overlapping spiral grooves that have different lead angles and/or lead directions to retain high fastening force.
Inventors:
MICHIWAKI HIROSHI (JP)
Application Number:
PCT/JP2017/015372
Publication Date:
October 26, 2017
Filing Date:
April 14, 2017
Export Citation:
Assignee:
NEJILAW INC (JP)
International Classes:
F16B33/02; F16B35/00; F16B39/16
Domestic Patent References:
| WO2009104767A1 | 2009-08-27 |
Foreign References:
| JPS5135846A | 1976-03-26 | |||
| JPS546168B2 | 1979-03-26 | |||
| JP4663813B2 | 2011-04-06 |
Other References:
See also references of EP 3447316A4
Attorney, Agent or Firm:
SAHARA Masashi et al. (JP)
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