DRILLING RIG Russian patent published in 2007 - IPC E21B3/00 E21B7/02 

FIELD: mining, particularly drilling rigs adapted to drill blast-holes and all-purpose wells.

SUBSTANCE: drilling rig comprises transport base, mast with guiding means, upper connection means, supports and movable rotator with guiders. The rotator is installed by means of upper and lower removable lids so that it can move in axial direction along mast guiders. Holders and control cylinders are created on rotator guiders. Control cylinders have shafts fastened to supply hydraulic pistons, which are connected to rotator guiders b means of fastening members through axes transversal to rotator guider surfaces. Shafts of supply hydraulic pistons are directed to cooperate with mast supports and may slide with respect to rotator guiders to project shafts beyond mast supports. Drilling rig also has rod assembly, hoist winch, cable and movable and fixed cable pulleys. The supports may move in axial direction along mast guiders and fastened to cross-arm provided with clamps and guiding bushes. The cross-arm is arranged below upper connection means of the mast between movable and fixed cable pulleys to provide cooperation with upper removable lids of rotator by means of guiding bushes.

EFFECT: increased efficiency of drilling operation to be performed in rock having alternating strength.

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