초록 ▼

A hollow, tubular, elongated beam is made by roll-forming an elongated strip of sheet metal into a generally rectangular cross-section shape with its opposite edge portions overlapped to form a double ply beam wall along one side of the beam. The plies are adhesively secured together by an adhesive

A hollow, tubular, elongated beam is made by roll-forming an elongated strip of sheet metal into a generally rectangular cross-section shape with its opposite edge portions overlapped to form a double ply beam wall along one side of the beam. The plies are adhesively secured together by an adhesive material inserted between them. The sheet metal is initially rolled into a U-shaped channel having a base and opposite walls. An integral, interior ledge is formed in, and extends along the length of, one of the channel walls. Then, the edge portion of the opposite channel wall is bent to form an inner ply that overlaps and closes the open channel, to form the tubular shape, with its free edge abutted against the ledge. Next, the free edge of said one channel wall is bent to form an outer ply around and overlapping the inner ply, with the abutted inner ply free edge and ledge serving as a support for the bending of the outer ply. The adhesive is inserted between the plies when the outer ply is bent.

대표청구항 ▼

A tubular beam formed of a single elongated bent sheet metal strip, comprising: said sheet metal strip being bent into a roughly rectangular in cross section tube having a base, integral side walls, and a two ply closure wall formed of the overlapping opposite edge portions of the sheet metal strip;

A tubular beam formed of a single elongated bent sheet metal strip, comprising: said sheet metal strip being bent into a roughly rectangular in cross section tube having a base, integral side walls, and a two ply closure wall formed of the overlapping opposite edge portions of the sheet metal strip; one of said edge portions forming an inner ply which extends from its side wall to the opposite side wall and having a flange on its free end in frictional engagement with an inner surface of the opposite side wall, and the other of said edge portion forming an outer ply that overlaps the inner ply with an end flange frictionally engaging a bulge portion in an outer surface of the opposite side wall; the overlapping adjacent faces of the two plies being slightly spaced apart, and an adhesive material positioned within the space for adhesively laminating the plies together; whereby the tube forms a unitary beam with a two ply laminated wall and three single ply walls.