Title:
梁
Document Type and Number:
Japanese Patent JP4469722
Kind Code:
B2
Abstract:
A roll formed beam ( 10 ) of substantially rectangular cross-section formed from a unity piece of metal. The beam includes opposed first ( 44 ) and second ( 46 ) substantially parallel walls formed with at least three adjacent layers of said piece of metal ( 44 a, b, c, and 46 a, b, c). The beam ( 40 ) also includes opposed third ( 48 ) and fourth ( 5 ) substantially parallel walls between the first ( 44 ) and second ( 46 ) walls. One of the third ( 48 ) or fourth ( 50 ) walls has a seam ( 52 ) joining two opposed longitudinal edges of the piece of metal. A method of roll forming a beam ( 4 ) is also disclosed.
Inventors:
Charlwood, Grant
Application Number:
JP2004545602A
Publication Date:
May 26, 2010
Filing Date:
October 22, 2003
Export Citation:
Assignee:
Charlwood, Grant
International Classes:
E04C3/04; B21D5/08; B21D47/01; E04C3/07
Attorney, Agent or Firm:
Hidekazu Miyoshi
Masakazu Ito
Masakazu Ito