Patent ID: 8359812
Filing Date: 2013-01-29
Classification: B21D,E04B,E04C,Y10T

Abstract:
1. A grid tee comprising an elongated sheet metal strip folded on itself to integrally form a lower double wall flange, a hollow upper reinforcing bulb, and a web extending upwardly between the flange and bulb, the flange generally lying in a horizontal plane and having its walls contiguous across substantially its full width so as to avoid relatively large hollows in an area below the web and symmetrically disposed relative to said web, the flange being substantially wider than the bulb, having opposed spaced parallel edges extending longitudinally, and being perpendicular to the web, the web lying in a generally vertical plane, the hollow bulb being symmetrically disposed about the plane of the web, the strip having two longitudinal extending marginal edge zones, said marginal edge zones being generally vertically disposed and fixed at least at longitudinally spaced locations to a central area of the strip that forms a portion of the web and forming a double web layer area, the marginal edge zones of the strip being vertically spaced from one another such that a portion of the central area of the strip that forms a part of the web is a single exclusive layer.