Rack beams and method of making same

Details Rack beams and method of making same Rack beams and method of making same

1989-11-01

1991-05-14

Murtagh, John E.

Static structures (e.g., buildings)

Machine or implement

211191, A47F 501, E04C 307

Patent

active

050144871

ABSTRACT:
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.

REFERENCES:
patent: 3234704 (1966-02-01), Burgess
patent: 3587483 (1971-06-01), Konstant
patent: 3611666 (1971-10-01), Poyser
patent: 4216729 (1980-08-01), Schrader
patent: 4221097 (1980-09-01), Dingler
patent: 4760682 (1988-08-01), King

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