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:
Sep. 13, 2011
Filed:
Dec. 25, 2006
Hirokazu Sasaki, Hyogo, JP;
Naofumi Nakamura, Hyogo, JP;
Shigeru Morikawa, Hyogo, JP;
Hideto Hashimoto, Tokyo, JP;
Takaaki Kimura, Tokyo, JP;
Yoshihiko Kawai, Tokyo, JP;
Hirokazu Sasaki, Hyogo, JP;
Naofumi Nakamura, Hyogo, JP;
Shigeru Morikawa, Hyogo, JP;
Hideto Hashimoto, Tokyo, JP;
Takaaki Kimura, Tokyo, JP;
Yoshihiko Kawai, Tokyo, JP;
Nisshin Steel Co., Ltd., Tokyo, JP;
Takata Corporation, Tokyo, JP;
Abstract
When forming a dowel section by performing press working on each of portions constituting side walls of a buckle base member, a die having a negative clearance with a punch portion () is used whose length or diameter is larger than a length or diameter of a die portion (). The dowel section is required as a guide for a tongue inserted into a buckle and as a load receiver when a latch member is elongated at a time of collision etc. When a ratio C/t of a clearance C between the punch portion and the die portion with respect to a plate thickness t of the buckle base member is set within a range of −(30 to 5) %, no crack is generated in the root of the dowel section, and the dowel section of a shear cross-section length ≧0.25×t, a shear cross-section starting height ≧0.7×t, and a height of (0.70 to 0.95)×t is easily obtained, and the perpenducularity of the dowel section side surface is enhanced.