Abstract: The disclosure concerns a square die-cast elevated floor plate having a top continuous or perforated panel reinforced underneath by a polygonal tessellation grid of ribs. All of the ribs of the grid, including their integral ejector pin bosses, and, if desired, the peripheral ribs or border flange, are of the same depth; however, concentric rows of polygons in the tessellation pattern have their ribs gradually increasing in thickness from the border flange to the center of the plate. The polygons in the pattern may comprise squares and octagons in which alternate sides of the octagons have a ratio of one to the square-root-of-two, and the sides of the squares correspond to the sides having the square-root-of-two length. The continuous or perforated top panel may be formed integrally or adhered to the tessellation rib pattern. The rib pattern with its integral ejector pin bosses is preferably symmetrical for at least 180.degree. rotation of its die.

Abstract: The disclosure concerns a square die-cast elevated floor plate having a top continuous or perforated panel reinforced underneath by a polygonal tessellation grid of ribs. All of the ribs of the grid, including their integral ejector pin bosses and border flange, are of the same depth; however, concentric rows of polygons in the tessellation pattern have their ribs gradually increasing in thickness from the border flange to the center of the plate. The polygons in the pattern may comprise squares and octagons in which alternate sides of the octagons have a ratio of one to the square-root-of-two, and the sides of the squares correspond to the sides having the square-root-of-two length. The continuous or perforated top panel may be formed integrally or adhered to the tessellation rib pattern. The rib pattern with its integral ejector pin bosses is preferably symmetrical for at least 180.degree. rotation of its die.