Hilti Aktiengesellschaft

Michael Beckert

Peter Gstach

Bernhard Winkler

Christoph Hakenholt

Patrick Scholz

Falk Rosenkranz

Tobias Neumaier

An expansion anchor, including at least one anchor body as a first element and at least one bolt as a second element, wherein the bolt has an expansion body, which pushes the anchor body radially outward when the expansion body is moved in an extraction direction in relation to the anchor body is provided. A double coating having an inner layer and an outer layer covering the inner layer is provided on one of the two elements in an area of contact with the other element, wherein the outer layer has a coefficient of friction with respect to the other element that is greater than a coefficient of friction of the inner layer with respect to the other element.

Expansion anchor having a double coating

An anchor () that can be secured in a drilled hole (), with an expansion sleeve () for anchoring onto a wall of the drilled hole, and with an anchor bolt () that passes through the expansion sleeve and that has an expansion section () for widening the expansion sleeve, and it also has a sleeve stop () that limits axial movement of the expansion sleeve away from the expansion section () is provided. At least one rotary catch () is provided which non-rotatably couples the expansion sleeve () to the anchor bolt (), and the expansion sleeve has at least one external thread helix () for creating an undercut in the wall of the drilled hole.

Anchor with an expansion section and a cutting thread

In the case of a thread-tapping screw (), especially a concrete screw (), including a screw head (), a screw shank () and a thread () that is formed on at least part of the screw shank (), whereby at least one longitudinal groove () is formed on a front section () of the screw (), starting at the end () of the screw on the screw shank (), and the at least one longitudinal groove () is delimited on the screw shank () by two lengthwise sides () running essentially radially relative to a longitudinal axis () of the screw (), it is the objective that the tightening torque needed when the screw () is being screwed into a drilled hole should be slight, and that the screw () should be produced cost-effectively. Each longitudinal groove (), at least one lengthwise side () is oriented at an angle &#x3b1; between 1&#xb0; and 20&#xb0; relative to a straight line running parallel to the longitudinal axis () of the screw (), and/or the at least one longitudinal groove () is configured on the screw shank () so as to be helical.

Growing community of inventors

Diepoldsau, Switzerland

Michael Beckert