Heraeus Quarzglas Gmbh & Co Kg

Henning Bierstedt

Uwe Christiansen

The invention concerns a drilling device ( ) for brittle materials with a drill head ( ) detachably fixed to a drilling rod ( ) by means of a positive-lock connection for transmission of the drilling torque. For its exact relative positioning, the drill head ( ) has a conical shape ( ) which in the represented operating state engages centrally into a corresponding recess ( ) of the drilling rod ( ). As a protection against any axial loosening, a fixing device or arrest ( ) designed as a hollow nut is provided engaging into a thread ( ) of the drill head ( ) and into a thread ( ) of the drilling rod ( ), the threads ( ) having countercurrent pitches. By rotating the arrest ( ), the drill head ( ) and the drilling rod ( ) can thus be simply braced against each other or pulled away from each other, the connection enclosed by the arrest ( ) having optimum protection from external influences at the same time. Accordingly, the drilling device ( ) allows for drilling at high accuracy without excessive wear or complicated handling.

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Friedersdorf, Germany

Henning Bierstedt