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:
Dec. 20, 2011
Filed:
Sep. 15, 2005
Tatsuya Okui, Osaka, JP;
Koichi Kuroda, Osaka, JP;
Masayoshi Akiyama, Osaka, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Abstract
The plug is for expanding the inside diameter of the end portion of a metal pipe. Its cross section is a circle, and includes a taper portion and a parallel portion connected to the tail end of the taper portion. The diameter of the taper portion gradually increases from the head end of the taper portion to the tail end of the taper portion where the diameter is D. The axial distance LR from the point where the diameter D=D×0.99 to the tail end where the diameter is Dsatisfies the Expression 22≦LR/((D−D)/2)≦115. The taper angle on the surface where the diameter is Dis larger than or equal to the taper angle on the tail surface of the taper portion following the point where the diameter is D. The diameter of the parallel portion is D