Patent ID: 6591576
Filing Date: 2003-07-15
Classification: B21D,B60R,E04C

Abstract:
A structural member formed of a plate-shaped and having a channel-shaped sectional portion and two closed sectional portions, each of said closed sectional portions including a side wall of said channel-shaped sectional portion,wherein said two closed sectional portions are formed so that ends thereof are next to a bottom wall of said channel-shaped sectional portion to overlap the bottom wall, wherein side edge portions of two of the closed sectional portions are bent to oppose the bottom wall and to contact each other, wherein each of said closed sectional portions has a planar portion adjacent to the side wall of said channel-shaped sectional portion and a curved portion disposed between said planar portion and said side edge portion, wherein said planar portion is connected to said side wall of said channel-shaped sectional portion at a right angle, and said curved portion is curved toward said planar portion in such a manner that said side edge portion is made into a top and that a compression stress remains in a curving direction between said planar portion and said side edge portion by interconnecting said side edge portions.