The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 30, 1997
Filed:
Oct. 25, 1995
Yukichi Iwata, Shinagawa, JP;
Iwata Bolt Kabushiki Kaisha, Tokyo-To, JP;
Abstract
The present invention relates to a male and female screw set wherein the male screw comprises at least a projecting part pressing against the flank plane of the female screw when the male and female screws are engaged. A dimensional difference is formed between the pitches of the female and male screw threads. When the female and male screws are engaged, the advancing side flank plane of the female screw thread is contacted by the advancing side flank plane of the male screw thread, while the other receding side flank plane of the female screw thread is contacted by other receding side flank plane of the male screw thread, and these respective flank planes are pressed together with tightening. In addition, the thread angle of the female screw is made approximately 1 degree 20 minutes to 3 degrees 30 minutes larger with respect to the male screw, so that when the male screw is taken as the standard thread angle, the respective flank angles of the male and female screw load threads mutually contact at the crest of the male screw when loaded, thereby preventing loosening and dislodging when the male and female screws are engaged.