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. 01, 2002
Filed:
Nov. 07, 2000
Applicant:
Inventor:
Masaki Tsuchiya, Yokkaichi, JP;
Assignee:
Daido Tokushuko Kabushiki Kaisha, Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D 3/14 ; B21B 1/706 ;
U.S. Cl.
CPC ...
B21D 3/14 ; B21B 1/706 ;
Abstract
A metal pipe expander which is inserted into a metal pipe and driven to move in the axial direction of the metal pipe by a liquid pressure has an expanding section and a pressure receiving section. The expanding section has a conical portion of which a small diameter portion is directed to a front side. The pressure receiving section has a cup shaped portion opened to the rear side, the outer surface of which is in slide contact with an inner surface of the metal pipe after it is expanded in diameter. The pressure receiving section is provided at a rear end of an expanding section.