Patent ID: 6012887
Filing Date: 2000-01-11
Classification: F16B

Abstract:
An undercut self-cutting anchor, comprising an anchor rod (2) having a stem (3) provided with load application means (4) at a rear end thereof and provided with a head portion (5) at an opposite end thereof, the head portion (5) having a diameter increasing toward a front end (6) of the anchor rod (2); and an expansion sleeve (8) longitudinally displaceable over the head portion (5) and having, at an end thereof adjacent to the head portion (5), a plurality of expansion tabs (11) separated from each other by longitudinal slots (10) and extending in a direction toward the head portion (5), the expansion sleeve (8) further having a plastic hinge-forming transition region (13) extending toward the expansion tabs (11), with a wall thickness (t) of the expansion sleeve (8) in the transition region (13) decreasing in a direction toward a front end (9) of the expansion sleeve (8), and the plastic hinge-forming transition region (13) having an axial length (1) according to a following expression 0.5D.ltoreq.l.ltoreq.3.0D, where D is a connection diameter of the anchor rod (2).