US 5,816,760 AGranted

Under cutting anchor

AssigneeHilti Aktiengesellschaft

InventorsRichard Mattner, Erich Wisser, Manfred Hartmann, Helmut Gassner, Susanne Kossian, Jakob Kunz, Rainer Kussmaul, Hermann Beck

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Abstract

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).

Claims9

Dependent claims

An undercut cutting anchor, comprising:

an anchor rod (2,20) having at a front, when viewed in a setting direction, end thereof a head (3,30)), the head (3,30) having a plurality of regions (12) expanding conically in the setting direction;
an expansion sleeve (5) having an axial through-bore through which the anchor rod extends, the sleeve (5) being axially displaceable along the anchor rod and having a plurality of longitudinal slots (7) extending from a front, when viewed in the setting direction, end of the expansion sleeve and forming at least two expansion tabs (6);
cutter means (16) provided at a free end of each of the at least two expansion tabs;
driver means for imparting rotation, which is generated during a setting process of the anchor rod, to the expansion sleeve;
and
means for supporting the anchor in a suspended condition within an anchor receiving bore (B) when an undercut is being formed in a wall of the receiving bore.

3 more elements

Dependencies are inferred from the claim text.