Abstract: Method of processing metal sheets which includes the steps of applying tensile stress to an intermediate region of a sheet of metal by engaging the sheet on opposite sides of the region, deforming the intermediate region of the sheet and removing the tensile stress applied to the sheet. The intermediate region of the sheet may be deformed by embossing and the tensile stress can be applied to the intermediate region of the sheet by forming a bead on opposite sides of the region. The means for processing metal sheets comprises first means including die members for forming beads on opposite sides of a metal sheet, and second means for deforming the intermediate region of the sheet while the stress is applied thereto by the first means.

Abstract: A decorative grille having a substantially rectangular frame in which each of the side members includes a substantially C-shaped channel section and a mounting flange extending substantially coplanar with a leg of the channel section. A plurality of spaced, parallel rods extend between two parallel side members of the frame. The rods have end portions which extend into the channel sections of the side members and are secured thereto by screws extending through the base of the channel sections and threaded into the rods. A plurality of plastic decorative grille elements are mounted in rows between adjacent rods, and between each of the other two side members of the frame and the adjacent rods. The grille elements which are adjacent a rod are interconnected to each other through the rods.