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Patent Searching and Data


Title:
DOWEL FORMING METHOD FOR BUCKLE BASE MEMBER
Document Type and Number:
WIPO Patent Application WO/2007/077947
Kind Code:
A1
Abstract:
A die with a negative clearance where the length or the diameter of a punch (2) is set greater than that of a die (3) is used to form a dowel section by press working. The dowel section is needed as a guide for a tongue inserted into a buckle and as a load receiver when a latch member is elongated in a collision etc. The dowel section is formed at portions that are to be side walls at both sides of a buckle base member. When a ratio C/t that is the ratio of a clearance C to the plate thickness t of the buckle base member is -(from 30 to 5)%, no cracks occur 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 height is (0.70 to 0.95) × t is easily obtained, and the perpenducularity of the side faces of the dowel section is improved.

Inventors:
SASAKI HIROKAZU (JP)
NAKAMURA NAOFUMI (JP)
MORIKAWA SHIGERU (JP)
HASHIMOTO HIDETO (JP)
KIMURA TAKAAKI (JP)
KAWAI YOSHIHIKO (JP)
Application Number:
PCT/JP2006/326324
Publication Date:
July 12, 2007
Filing Date:
December 25, 2006
Export Citation:
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Assignee:
NISSHIN STEEL CO LTD (JP)
TAKATA CORP (JP)
SASAKI HIROKAZU (JP)
NAKAMURA NAOFUMI (JP)
MORIKAWA SHIGERU (JP)
HASHIMOTO HIDETO (JP)
KIMURA TAKAAKI (JP)
KAWAI YOSHIHIKO (JP)
International Classes:
B21D28/10; B21D28/16; B21D53/88; B60R22/12
Foreign References:
JP2002096119A2002-04-02
JPH06225804A1994-08-16
Other References:
See also references of EP 1970137A4
Attorney, Agent or Firm:
OGURA, Wataru et al. (23-7 Kaname-cho 3-chome, Toshima-k, Tokyo 43, JP)
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