Patent ID: 7552569
Filing Date: 2009-06-30
Classification: B33Y,E04C,Y10T

Abstract:
1. A metal unitary structural member, comprising: an elongated, axially extending central portion; a plurality of web portions, each of said web portions extending, in perpendicular cross-section, radially outward from said central portion along a trajectory, each of said web portions extending in an axial direction along a length of said central portion; and a plurality of outer portions extending in said axial direction along a length of said central portion and between said web portions in perpendicular cross-section, said plurality of outer portions defining a outer surface of the member that encloses said central portion, said plurality of outer portions being arched in perpendicular cross-section so that corrugations are formed between said web portions along said outer surface; wherein, for each of said plurality of web portions, the trajectory is curvilinear.