Hilti Aktiengesellschaft

Hermann Beck

Erich Wisser

Helmut Gassner

Susanne Kossian

Rainer Kussmaul

Markus Hartmann

Reinhard Lins

Thomas Doppelbauer

Jakob Kunz

Manfred Hartmann

Richard Mattner

A tool for setting self-cutting undercut anchors (6) in boreholes (B) in a receiving material (G) includes anchors (6) formed of an axially extending anchor rod (7) with a conically shaped surface at a leading end of the rod widening in the setting direction, and an axially extending rotatable sleeve (9) laterally enclosing the anchor rod and which is axially displaceable against the conically shaped surface for effecting radially outward spreading of cutting tabs located at the leading end of the sleeve. The cutting tabs form an undercut (U) in the inner surface of the borehole (B) as the sleeve is rotated. The tool has a rotatable propelling part (2) for the sleeve (9) of the undercut anchor (6) and a trailing end (3) of the propelling part is arranged for insertion into a chuck of a rotary hammer drill. The propelling part (2) cooperates with a support element (4) arranged to be supported by the surface of the receiving material (G) in which the borehole (B) is formed. The support element (4) has a receptacle (5) for the trailing end of the anchor rod in which the anchor rod can be axially fixed. The propelling part (2) can be displaced axially relative to the support element.

Setting tool for self-cutting undercut anchors

A spreading anchor (1) including an anchor rod (2) provided at its front end, when viewed in a setting direction, with a head (3, 30) having at least several regions, which taper outwardly in the setting direction, and extending through an axial through-bore of an expansion sleeve(5) axially displaceable along the anchor rod (2, 20) and having a plurality of axial longitudinal slots (7) extending from a front end of the expansion sleeve (2, 20) and forming at least two, located opposite each other expansion tabs (6) provided at their free front ends with cutters (16), the spreading anchor (1) being supported against an upper surface of a ground (G) and further including rotation-transmitting driver elements for transmitting axial rotation, which is generated during setting of the anchor rod (2, 20), to the expansion sleeve (5).

Under cutting anchor

A spreading anchor including an anchor rod having a stem (2) provided at its front end with a cone (3) which widens toward its free end, and a sleeve (5) which surrounds the stem (2), is axially displaceable along the anchor rod, and has a plurality of cutting tabs (6) separated from each other by axially extending slots (70, extending from a hinge point (9) in a direction of the cone (3), and having cutters (10), in regions of their free front ends, with the cutting tabs expanding radially upon the sleeve (5) being pushed onto the cone (3), with the sleeve (5) having at its free end in a region of the cutting tabs (6), and axially extending folded-over section (8) having an axial length (1) corresponding approximately to the length of the axial slots, and with the hinge (9) being located in the transition region between the folded-over section (8) and the sleeve outer surface.

Spreading anchor with undercut-forming cutting means

A spreading anchor including an anchor rod (2) having a stem (12) provided at its front end, when viewed in a setting direction, with a cone (3) widening outwardly towards its free end and a longitudinally displaceable sleeve (4) pushed over the anchor rod (2) and having at a front end (8) cutting tabs (5) which are provided with cutters, are separated from each other by gaps, extend from a plastic hinge (11) toward the cone (3), and are spread radially upon sliding of the sleeve (4) over the cone (3), the sections of the cutting tabs (5), which extend from free ends thereof in a direction toward the plastic hinge (11), having an outer surface (6) remote from the cone (3) and formed at least in their cutting region thereof as a substantially toroidal surface.

Spreading anchor

Growing community of inventors

Feldkirch-Tisis, Austria

Hermann Beck