Abstract: An apparatus for drilling short and long holes and for fitting bolts to the short holes has a generally stationary support positioned adjacent the face and a turret angularly displaceable on the support between two end positions about a longitudinal turret axis. A drill slide longitudinally displaceable on the turret carries a drill having a rotatable stem centered on a drill axis parallel to the turret axis. A drill bit can be fitted to the stem. A bolt slide longitudinally displaceable on the turret adjacent the drill slide carries a bolting unit having a ram centered on a bolt axis. A magazine mounted on the support adjacent the turret has a plurality of seats adapted to hold the bolts and extension rods fittable between the bit and the drill stem, depending on whether the device is to be used for short-hold drilling and bolting or for long-hole drilling.

Abstract: A telescoping drill has a base, a guideway displaceable longitudinally forwardly and rearwardly on the base, a guideway actuator braced between the guideway and the base and energizable for longitudinal forward displacement of the guideway on the base, a guideway source of energy connected to the guideway actuator for longitudinally forwardly displacing the guideway on the base, a drill carriage displaceable longitudinally on the guideway between a front position and a rear position, a drill actuator braced between the drill carriage and the guideway for longitudinal forward displacement of the carriage on the guideway, and a drill source of energy independent of the guideway energy source and connected to the drill actuator for longitudinally forwardly displacing the drill carriage on the guideway. A sensor detects when the drill carriage is in the rear position.

Abstract: A rock drill has a normally stationary base, a support movable longitudinally on the base forward toward and backward away from a rock face adjacent the base and having a part engageable forwardly with the face, a base actuator braced longitudinally between the base and the support for longitudinally moving the support on the base and for pressing the part of the support forward against the face with a predetermined anchoring force, a drill movable longitudinally on the support and having a drilling tool engageable in the face for drilling a longitudinal hole therein, and a drill actuator braced longitudinally between the drill and the support for longitudinally moving the drill on the support and for pressing the drilling tool longitudinally forward against the face adjacent the part with a predetermined drilling force. A pressure detector or sensor is provided on the part for producing an actual-value output corresponding to the reaction force or pressure exerted axially backward on the support by the face.