Wirth Maschinen-und Bohrgerate-fabrik Gmbh

Willi Steufmehl

Georg Hurtz

Wolfgang Krappen

Method and apparatus for modifying the cross-sectional profile of an

Producing a vertical or inclined drill hole by full profile drilling taking place upwardly from a starting location and utilizing a rotatable and displaceable drilling tool and a train of drilling rods which lead to the drilling tool, wherein the drilling tool is, together with the train of drilling rods, subjected, in the vicinity of the upper end of the train of drilling rods, to a force applied in the feed direction, at least part of the reaction of this force being transmitted to a counterabutment which can be releasably secured in the drill hole, and the driving torque for the drilling tool being produced at the starting location and mechanically led from there to the drilling tool.

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Erkelenz, Germany

Willi Steufmehl