Automobile door reinforcing member

Abstract

An automobile door reinforcing member consists of a twin pipes exercising high strength and rigidity. This automobile reinforcing member has been developed by the structure wherein a pair of pipes are formed relatively from an original sheet material by the joint surface as being a middle portion of an original sheet in width direction, the fold-back faces consist of the outer side faces of the pipes extending laterally from said joint surface, the outer wall faces extending from said outer side faces of the pipes, and the inner side faces of the pipes extending from said outer wall faces, the inner wall faces extending from said fold-back faces to the joint surface, and the welding portions extending from said inner wall faces, with forming these portions to lateral pipes relatively with bending the fold-back faces, folding boundary mark between the inner wall face and the welding portion in valley-shaped, and putting those welding portions onto the joint surface situated at interval between said pipes, and then welding both of welding portions and the joint surface for integrating.

Dependencies are inferred from the claim text.