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:
Nov. 24, 2015
Filed:
Jun. 22, 2011
Osamu Sonobe, Chiba, JP;
Takuya Nagahama, Aichi, JP;
Masaki Yoshikawa, Aichi, JP;
Jun Takano, Aichi, JP;
Takamasa Kawai, Aichi, JP;
Kazunari Takahashi, Aichi, JP;
Osamu Sonobe, Chiba, JP;
Takuya Nagahama, Aichi, JP;
Masaki Yoshikawa, Aichi, JP;
Jun Takano, Aichi, JP;
Takamasa Kawai, Aichi, JP;
Kazunari Takahashi, Aichi, JP;
JFE STEEL CORPORATION, Tokyo, JP;
Abstract
A threaded joint for a pipe is disclosed in which scalability, compression resistance, and galling resistance are enhanced. The threaded joint includes a pin nose outer peripheral surface that forms an outward convex curve in an axial cross-sectional view; the convex curve is such that a composite R curve, in which a plurality of outward convex arcs having different radiuses of curvature are connected in sequence to a generating line of a cylindrical portion next to a male member, is curved such that the radiuses of curvature increase with distance from the male member and tangents on connection points of the arcs are aligned with those of corresponding arcs connected thereto; and the inner peripheral surface of a box component facing the pin nose is a tapered surface that interferes with the pin nose outer peripheral surface when connected to a pin component.