Trench-shaped structure to form through hole in e.g. plastics housing for electrical or electronic applications, has sharp edge for controlled split of material to provide smooth sides of through hole

摘要

Structure (1) to form through holes in material (2), is a trench shaped notch with a sharp edge (7) at its base for local limitation of stress during pressing out of segment (4). Structure causes targeted continuation of split (6) that begins at sharp edge while pressing out segment. Structure encloses segment on one or both sides of material and provides weakness line allowing removal of segment from defined surface area, to provide through opening. An Independent claim for a method for formation of a through opening in material using the structure to press out a segment with one-off or cyclic loading on structure.