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:
May. 29, 2001
Filed:
Oct. 13, 1999
Applicant:
Inventors:
Minoru Tada, Mie, JP;
Mikio Morinaga, Mie, JP;
Assignee:
Bestex Kyoei Co., Ltd., Mie, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D 3/106 ;
U.S. Cl.
CPC ...
B21D 3/106 ;
Abstract
In an apparatus and a method for forming threaded portions around a metal pipe with accuracy and ease, a preliminary forming is performed so as to recess portions of the metal pipe a little bit inwardly in the radial direction thereof by advancing auxiliary forming punches while keeping main forming punches as they are. Thereafter, by receding the auxiliary forming punches back, while advancing the main forming punches, simultaneously, the threaded portions are formed on outer periphery of the metal pipe,shifted by 180° in phase thereof.