Hilti Aktiengesellschaft

Joachim Woerz

Olaf Koch

Werner Britten

Karl-Heinz Hofmann

A drill, which is used in a hammer drill for drilling holes in stone, concrete and the like, includes a one-piece drilling head () formed of a hard material and provided, at its first end (), with at least one main bit having a tip () and at least one cutting structure () integral to the one-piece drilling head (), and at a second end () located opposite the first end (), with a bottom surface () for the mounting the drilling head () on the drill stem (), and having a plurality of axially extending through-grooves () for removing drillings produced during a drilling process and having a cross-section which increases, at least regionwise, in a direction toward the bottom surface () of the drilling head ().

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Landsberg, Germany

Joachim Woerz