DRILLING UNIT Russian patent published in 2008 - IPC E21B7/02 E21B3/00 E21B15/00 

FIELD: mining.

SUBSTANCE: unit contains foundation, pivotally mounted on it tower implemented in the form of rectangular frame, outfitted by guide ways (3), and implemented in the form of channel bar, for carriage advance (4). Carriage (4) is outfitted by brackets (7) with affixed in it axes (8) through bearings (9) by rollers (10), located in pairs from outsides of flanges of each guide way (3). Carriage (4) is also outfitted by controlling means of axial distance between contiguous rollers (10), implemented in the form of bushing (11) with off-centered relative to each other external and internal surfaces, mounted on axis (8) in bracket (7) and affixed in specified position by cover (13), implemented with taper bore. Bushing (11) is outfitted by tapered flange (15), interacted with taper bore of cover (13).

EFFECT: reliability improvement of drilling unit operating.

2 cl, 3 dwg