Abstract: A modular tile for an access floor panel system wherein the tile includes a mechanism for positively locating the tile on an access floor panel so as to be replaceable and removable without the use of indexing tools or fixtures through the tile's bottom surface or the panel's top surface and having a configuration which orients the tile to the access floor panel, the size of the tile being consistent and modular with each and every access floor panel in the access floor panel system.

Abstract: A structural member comprising a sheet of industrial material in which is formed a plurality of dome-like projections of which at least the major portion of the configuration thereof in plan view is circular and said projections being located in the plane of said sheet in a structurally strategic geometric pattern which repeatedly blocks straight lines of vision across said sheet through said pattern of projections in all directions to form a one-piece rigid structural member capable of resistance to flexure and the intermediate portion of the sheet between said projections comprising arcuate continuous structural stress-resisting sections extending between the opposite edges of said member. Variations in patterns of projections comprise different embodiments of said member and, when fabricated, said member lends itself to a variety of end uses. When in the form of a composite panel, a flat sheet of planar material is affixed to the upper ends of said projections.