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Title:
SCREW STRUCTURE, SCREW COMPONENT, SCREW CUTTING TAP, DRIVING RIVET, PROCESS OF MANUFACTURE OF SCREW STRUCTURE AND ROLLING DIE
Document Type and Number:
Japanese Patent JP2015064041
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a screw structure capable of remarkably reducing a contact area in respect to a mating member 8 as compared with that of the prior art, its process of manufacture, a rolling die used for its manufacture, a screw component having such a screw structure, a screw cutting tap and a driving rivet.SOLUTION: There are provided the first and second helical valley grooves 2, 3 crossing to each other to form several ridges 4 surrounded by these two valley grooves 2, 3, these ridges 4 are discontinuous from each other, but constitute a common screw thread to make a screw structure and these ridges 4 form a sharp-pointed shape toward an advancing direction of the screw thread. The rolling die has the first rolling die with the first protrusion corresponding to the first valley groove 2 and the second rolling die with the second protrusion corresponding to the second valley groove 3.

Inventors:
SHIMADA JUNPEI
Application Number:
JP2013197780A
Publication Date:
April 09, 2015
Filing Date:
September 25, 2013
Export Citation:
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Assignee:
DAISHIN CO LTD
International Classes:
F16B33/02; B21H3/06; B23G5/06; B23G7/00; F16B25/04; F16B35/00
Domestic Patent References:
JPS4850157A1973-07-14
JPS5070374U1975-06-21
JP2006189056A2006-07-20
JPS5180556U1976-06-26
JP2000102831A2000-04-11
JPS5358894A1978-05-27
JPH11254072A1999-09-21
Foreign References:
WO2009104767A12009-08-27
US20110262245A12011-10-27
US4572875A1986-02-25
WO2009104767A12009-08-27
US20110262245A12011-10-27
US4572875A1986-02-25
Attorney, Agent or Firm:
Izumi Omori