Plastic swingboard bracing panel

Claim 1

A swingboard comprising: a first sheet of plastic material having a plurality of longitudinally disposed and laterally spaced ribs, each rib having a U-shaped configuration including an outwardly projecting base and upright walls, the walls of adjacent ribs being connected by an integral web; a second sheet of plastic material having a plurality of longitudinally disposed and laterally spaced ribs, each rib of said second sheet having a U-shaped configuration and including an outwardly projecting base and upright walls, the adjacent walls of said last-mentioned adjacent ribs being connected by a second integral web, said first and second sheets of material being joined in an abutting relationship such that the rib bases on each sheet project outwardly on opposite sides of said joined sheets and said first and second sheet webs inner opposing surfaces are in abutment and the upright walls of said ribs of one sheet are in alignment with adjacent, opposing upright walls of the other sheet; flange members extending from the longitudinal ends of said joined sheets, each of said flange members being fused to each other and having a cut-out portion to permit access to the interior of said fused flange members, said longitudinal ribs terminating at a location adjacent said flanges; a structural support member located between opposed inner surfaces of said flanges; a U-shaped metal member encompassing the outside of said flanges; and fastening means extending through said U-shaped member, said flanges and said structural support member to secure said joined sheets to said U-shaped metal member, each of said U-shaped end members having apertures corresponding to said cut-out portion.