Method of manufacturing rectangular tube having stepped portion

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United States of America Patent

PATENT NO 9821355
APP PUB NO 20150273548A1
SERIAL NO

14229440

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Importance

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Abstract

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A method of manufacturing a rectangular tube having a stepped portion includes: forming V-shaped grooves on a rectangular tube at surfaces of an end thereof in a direction parallel to a longitudinal direction thereof; and pressing each of the surfaces having the V-shaped grooves formed thereon with a rotating roll from outside to inside, whereby the end of the rectangular tube is radially reduced.

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Patent Owner(s)

Patent OwnerAddress
NISSHIN STEEL CO LTDCHIYODA-KU TOKYO 100-8366

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kurobe, Jun Sakai, JP 12 23
Nakamura, Naofumi Sakai, JP 71 726
Sasaki, Hirokazu Sakai, JP 62 304
Tanoue, Ryuji Sakai, JP 4 7

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