Step metal, the production of such an operation and a staircase comprising such a marketing authorisation holder

摘要

This step is made from a blank of sheet metal and provided, on an upper face (2013), reliefs anti - slip (210) formed on the basis of the edges of the openings (220) of rectangular form. These edges are drawn upwards on a rounded zone (218) around each opening (220) and each side of the press-formed (211 - 214) is of convex and rounded between two recessed areas (312, 323, 334, 341) for connection with two adjacent edges. According to the process of the invention, it perforates the rectangular openings (220) in a side plate is stamped and the edges of these openings with a rounded transverse section, bringing these edges projecting. Then, the side plate so that the face (2013) from which extend the edges of the press-formed elements (211 - 214) forms the upper face of the marketing authorisation holder.