PROCEDE DE FABRICATION D'ELEMENTS D'ANCRAGE TUBULAIRES POUR VIS DIT CHEVILLE ET PRODUIT AINSI OBTENU

摘要

A tubular screw anchoring member (10) for mounting a screw in a bored hole comprises a number of longitudinally extending, peripherally spaced, flexible ribs or fins (14) projecting radially outwardly from the outer surface of the anchoring member. The anchoring member is of the extruded type having a substantially uniform cross-section along its total length. In order to make it possible to use fins having a relatively big radial extension without substantially increasing the torsional resistance of the anchoring member, the fins or ribs are provided with axially closely spaced notches or indentations (15).