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)
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:
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)
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:
JP2002096119A | 2002-04-02 | |||
JPH06225804A | 1994-08-16 |
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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