Rack beams and method of making same
US5014487A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1989 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Nov 1, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04C2003/0465
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.