Fastening element

Abstract

A fastening element for constructional components, includes an anchor bolt and an expansion sleeve (18, 38), with the anchor bolt having a load application element (15) at its first end region (14) of the anchor stem (13, 33), and at a second, opposite end region (16, 36) an expansion portion (17, 37) having a conical section (19, 39) that expands in a direction of a free end of the second end region, and a cylindrical section (20, 40) that adjoins the conical section (19, 39) and has a shaped profile formed by ribs (26, 46) extending parallel to the longitudinal axis (12, 32) of the stem with the ribs (26, 46), projecting beyond an axial projection of an outer profile of the expansion sleeve (18, 38) by a distance (U. V).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings show:

FIG. 1 a longitudinal side view of a fastening element according to the present invention;

FIG. 2 a cross-sectional partial view of region A in FIG. 1 at an increased, in comparison with FIG. 1, scale;

FIG. 3 a cross-sectional view along line III-III in FIG. 1 at an increased, in comparison with FIG. 1, scale; and

FIG. 4 a view similar to that of FIG. 2 of another embodiment of a fastening element according to the present invention.

Claims

1. A fastening element for being anchored in a borehole (7) of a constructional component, comprising an anchor bolt; and an expansion sleeve (18, 38); wherein the anchor bolt has a stem (13; 33) having a longitudinal axis (12, 32) and provided with load application means (15) at a first end region (14) thereof and at a second, opposite end region (16, 36) thereof, with an expansion portion (17, 37) for expanding the expansion sleeve (18, 38) that at least partially surrounds the stem (13, 33), the expansion portion (17, 37) having a conical section (19, 39) that expands in a direction of a free end of the second end region (16, 36) of the stem (13, 33), and a cylindrical section (20, 40) that adjoins the conical section (19, 39) and has a shaped profile formed by ribs (26, 46) provided on the cylindrical section (20, 40) and extending parallel to the longitudinal axis (12, 32), the ribs (26, 46) projecting beyond an axial projection of an outer profile of the expansion sleeve (18, 38) by a distance (U; V).

2. A fastening element according to claim 1, wherein the distance by which the ribs (26, 46) project beyond the axial projection of an outer profile of the expansion sleeve (18, 38) amounts to from 0.3 to 2 mm.

3. A fastening element according to claim 1, wherein a number of ribs (26, 46) formed on the cylindrical section (20, 40) of the expansion portion (17, 37), is from two to eight.

4. A fastening element according to claim 1, wherein the ribs (26, 46) are uniformly distributed over a radial circumference of the cylindrical section (20, 40) of the expansion portion (17, 37).

5. A fastening element according to claim 1, wherein the ribs (26, 46) have, in a direction transverse to the longitudinal direction, a roof-shaped profile.

6. A fastening element according to claim 5, wherein an angle (B) formed by the roof-shaped profile is less than 120°.

7. A fastening element according to claim 1, wherein the ribs (26, 46) have a first edge (27) extending parallel to the longitudinal axis (32) and forming an extension of an angle (c) of the expansion portion (17).

8. A fastening element according to claim 1, wherein the ribs (26, 46) have a second edge (28, 48) extending parallel to the longitudinal axis (12, 32) and formed as a sharp cutting edge.

9. A fastening element according to claim 8, wherein the second edge (28) extends to the free end (21) of the expansion portion.