Hilti Aktiengesellschaft

Thorsten Assel

Udo Hauptmann

Olaf Koch

Ralf Greitmann

Josef Starkmann

Klaus Hoeggerl

Christoph Wetter

Tim Pröls

Klaus Höggerl

A hard material bit for a rotary-percussion tool () includes at least one cutting edge (), a bottom surface () located opposite the at least one cutting edge (), and at least one attachment surface () and at least one free surface () both extending transverse to the bottom surface () and forming, respectively, a piecewise extending first chamfer () and second chamfer (), with the second chamfer () having a width greater than a width of the first chamfer ().

Hard material bit

A rock drill () for cutting rock comprising an elongated, helical shaft (), which has, at one end, an insertion part () and, at the end opposite, a tool head () with cutters () made of hard material, wherein the helical shaft () is at least partially coated with a colored layer () and the layer forms a lengthwise running wear indicator marking () inside the helical groove ().

Rock drill

Growing community of inventors

Landsberg, Germany

Thorsten Assel