Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Truss with unitary chord and web; e.g. – sheet metal
Patent
1979-12-17
1982-05-18
Friedman, Carl D.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Truss with unitary chord and web; e.g., sheet metal
52732, 52738, E04B 118
Patent
active
043298249
ABSTRACT:
A panel of thin sheet metal is roll-formed into a beam having upper and lower first flange portions integrally connected by a web portion, and the first flange portions are reinforced by corresponding second flange portions which may be formed from the panel and folded back onto the corresponding first flange portion. The upper and lower flange portions project in opposite directions from the web portion providing the beam with a Z-shaped cross-sectional configuration to facilitate close nesting of the beams in a stack. A plurality of parallel spaced stiffening ribs are formed in the web portion, and longitudinally extending stiffening ribs are formed in the flange portions. When the ribs in the web portion extend longitudinally of the beam, a series of longitudinally spaced strut members extend transversely between the flange portions across the ribs and are attached to the flange and web portions. The strut members may extend through corresponding sets of aligned holes within the ribs, or the ribs in the web portion may extend transversely between the flange portions. The second flange portions may also be formed by separate heavier sheet metal strips which are attached to the first flange portions and the web portion.
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