A METHOD OF MANUFACTURING AN ANTISLIP LADDER RUNG AND A LADDER RUNG

摘要

A method of manufacturing an antislip ladder rung (1), and an antislip ladder rung (1). The method comprises arranging a tubular rung (1) made of sheet metal, and arranging an antislip roughening (2) to the rung. The method comprises punching the tubular rung in the diametral plane of the rung with a pressing punch (3, 3) having a plurality of spaced puncturing rods (4) with pointed tips. The puncturing rods (4) are arranged in a row. During the punching stroke, at a first side of the rung, the pointed tips puncture through the wall of the rung forming inlet openings (5) and at the opposite second side of the rung the pointed tips create protrusions (6, 6) that form the antislip roughening (2). The antislip roughening (2) comprises a plurality of outwardly protruding, from the inside of the rung outwardly pressed, deformations as protrusions (6, 6) deformed from the material of the wall of the rung.