Hilti Aktiengesellschaft

Georg Oberndorfer

Marc Schaeffer

Bernhard Winkler

Peter Gstach

Simon Oppeneiger

Franz Huber

Corinna Achleitner

Sascha Dierker

Mathias Goldt

Juergen Gebhard

Falk Rosenkranz

Andreas Vorhauer

Juergen Gahn

Carl Hoffmann

Berthold Aumueller

Martin Pleil

Michael Splitt

Pietro Bianchi

Marc Schäffer

Jürgen Gebhard

Jürgen Gahn

Berthold Aumüller

When it comes to an expansion plug () including an anchor bolt () with an expansion element () on a first end section () of the anchor bolt () having a longitudinal axis (), preferably also including at least one force-applier () on the anchor bolt () in order to hold loads, and also including an expansion sleeve () surrounding the anchor bolt (), the objective is to avoid an axial movement of the expansion sleeve (), especially in the case of a drilled hole diameter in the lower tolerance range or in the case of a hollow space. The expansion plug () has at least one eccentric geometry, so that an expansion of the expansion sleeve () can be achieved by a rotational movement of the anchor bolt (), especially around the longitudinal axis () as the axis of rotation ().

Expansion plug

A method for manufacturing a thread-forming screw having a shank and a thread formed in one piece with the shank and region-wise circumferentially arranged on the shank, is disclosed. After the formation of the thread on the shank, a plurality of recesses is subsequently stamped into the thread. Then, a plurality of compact cutting elements is welded into the recesses in the thread, where the cutting elements are made of a hard material and have a hardness greater than the hardness of the thread. Additionally, a stamping device for carrying out the method is also disclosed.

Method for manufacturing a thread-forming screw

A fastening element has a shaft (), and a tapping thread () carried by the shaft () and having at least one screw thread () a section () of which that adjoins the thread pilot (), having a plurality of following one another thread steps () having different cross-sections, with a cross-section of the at least one screw thread () decreasing stepwise toward the thread pilot () from a thread step () to a thread step (), with the thread steps () having respective cutting edge-forming end surfaces () aligned, at least partially, in a direction of the thread pilot ().

Fastening element

Growing community of inventors

Feldkirch, Austria

Georg Oberndorfer