Title:
SAG PREVENTIVE STRUCTURE FOR BOLT OR NUT, AND BOLT FOR THE SAME
Document Type and Number:
Japanese Patent JP2016211649
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a sag preventive structure for bolts or nuts and a bolt used for the structure capable of assuring a male thread strength of a bolt and sag preventive performance.SOLUTION: A bolt shant part 10A is formed with a trapezoidal screw thread 10B of a right-hand screw or a left-hand screw, a top surface of the trapezoidal screw is formed with a second screw 10C in such a way that the second screw is continuous on a virtual cylinder contacted with the top surface, its pitch is smaller than that of the trapezoidal screw and it shows an inverse screw against the trapezoidal screw, the trapezoidal screw is engaged in thread with a fastening nut 11, the second screw is engaged in thread with a lock nut 12, the lock nut is competed against the fastening nut to cause a return rotation of the fastening nut to be prevented.SELECTED DRAWING: Figure 1
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Inventors:
HAMANAKA SHIGENOBU
HATABE KOICHI
HATABE KOICHI
Application Number:
JP2015095463A
Publication Date:
December 15, 2016
Filing Date:
May 08, 2015
Export Citation:
Assignee:
HAMANAKA NUT CO LTD
International Classes:
F16B39/12; F16B33/02; F16B35/00; F16B39/30
Domestic Patent References:
| JP2012037038A | 2012-02-23 | |||
| JPS56108016U | 1981-08-21 | |||
| JP2009019651A | 2009-01-29 | |||
| JP2003232326A | 2003-08-22 |
Attorney, Agent or Firm:
Hisao Ishii