Structural assemblies

Claim 1

A structural assembly for forming a load supporting structure and comprising a plurality of elongated extruded aluminum units, each said unit comprising a base portion and a plurality of parallel, longitudinally extending, laterally spaced ribs having coplanar lateral flanges on their free standing ends, a longitudinal base flange extending from one edge of each said unit a distance approximately equal to the spacing between said ribs, a downwardly depending projection extending laterally form the edge rib adjacent said base flange and spaced above said edge flange, a tongue extending laterally outwardly from the other lateral edge of said unit above the base thereof a distance at least equal to the thickness of said base flange, an edge portion of said tongue having an increased thickness, an upwardly directed slot in said edge portion resilient sealing material filling said slot and extending upwardly therefrom towards said projection whereby to maintain said projection and said tongue spaced apart, and fulcrum means on said base flange acting against said tongue to bias said sealing material into sealing engagement with said projection in the assembled condition of said units.