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:
Jan. 09, 2007
Filed:
Mar. 19, 2004
Teruie Takemasu, Fukuoka, JP;
Hiroshi Miyahara, Fukuoka, JP;
Teruie Takemasu, Fukuoka, JP;
Hiroshi Miyahara, Fukuoka, JP;
Kyushu TLO Company, Limited, Fukuoka, JP;
Abstract
A method and apparatus for manufacturing a bolt capable of mass-producing a multiple screw bolt such as a so-called double screw bolt at a low unit price, and a thread rolling die for use therein. The apparatus for manufacturing a bolt comprises a pair of thread rolling dies () which are arranged opposite to each other at a predetermined interval, and a bolt supporting unit () which supports a cylindrical bolt material () in a predetermined position. The thread rolling dies () are provided with a transfer pattern () having a coarse thread portion () which is part of a coarse thread formed by developing a coarse screw, and projections () which are part of a fine thread () formed by developing a fine screw as shown by an imaginary line (), the fine thread () being formed cyclically on a root portion () of the coarse thread according to a phase shift between the fine thread and the coarse thread.