NON-SLIP STRUCTURE

摘要

A non−slip structure capable of increasing a non−slip effect,eliminating a defect caused by a through−hole,and increasing a reliability,characterized in that a part of a sheet metal such as a steel sheet is sheared to form cutting lines for forming projected pieces(a pair of side cutting lines,and a connection cutting line)and the projected pieces are raised along the cutting lines to a larger equal to or higher than the thickness of the steel sheet to raise sheared faces(edges)along the cutting lines so that the sheared faces do not come into contact with the steel sheet to form a clearance and the through−hole in the steel sheet.