METALLIC EXPANSION ANCHOR AND ITS METHOD OF MAUFACTURE.

摘要

The expansion anchor comprises a shaft (1) which exhibits, at its rear end, means for fastening an object and, at its front end, a cross-sectionally reduced portion (3) with an adjoining expansion cone (4), and it further comprises an expansion sleeve (5) which is pushed over the said portion and has longitudinal slits (6) and locking elements (7) which project beyond the diameter of the expansion sleeve (5). The locking elements are a plurality of continuous punched-out portions running in the longitudinal direction of the expansion segments. The punched-out portions are each in the form of a triangle with the point directed towards the front end of the expansion segments. The contour of the projected development of the expansion sleeve is initially punched out in slight under-size, and the sheet metal is then compressed in its thickness in a pressing procedure. The locking elements are punched out after the compression.