METALLIC STAIRCASE MARK, METHOD OF MANUFACTURING SUCH MARKET AND STAIRCASE COMPRISING SUCH A MARKET

摘要

This metal stair step is made from a side panel and provided, on an upper face (2013), anti-skid reliefs (210) formed from the edges of openings (220) of rectangular shape. These edges are stamped upward on a rounded area (218) around each opening (220) and each stamped edge (211-214) is convexly shaped and convex between two recessed areas (312, 323, 334, 341). connecting with two adjacent edges. According to the method of the invention, rectangular apertures (220) are perforated in a sheet-metal flank and the edges of these openings are stamped with a tool having a rounded cross-section, bringing these projecting edges. Next, the sheet flank is folded so that the face (2013) from which the embossed edges (211-214) extend forms the upper face of the step.