Patent ID: 6074145
Filing Date: 2000-06-13
Classification: F16B

Abstract:
An undercut self-cutting spreading anchor, comprising an anchor rod (5) provided at one end thereof, with load application means for supporting an attachment element and, at opposite end thereof, with a head portion (7) having a substantially crowned shape and having a largest diameter region (9), a rear section (8) adjoining the largest diameter region (9) at a side of the largest diameter region (9) facing in a direction opposite to a setting direction (S) and having a diameter decreasing in the direction opposite to the setting direction (S), and at least two front sections (11,13) adjoining the largest diameter region (9) at a side of the largest diameter region (9) facing in the setting direction (S) and having each a diameter progressively decreasing toward a free end (6) of the anchor rod (5), each of the two front sections (11,13) being defined by an annular surface (12,14), with a mean inclination angle of the annular surface (12,14) toward an axis (A) of the anchor rod (5) increasing in the setting direction (S); and a sleeve (2) displaceable axially along the anchor rod (5) and having a plurality of expansion tabs (3) separated by longitudinal slots and expanding radially upon the sleeve sliding over the head portion (7) of the anchor rod (5).