ROLLING CUTTER DRILL BIT SUPPORT Russian patent published in 2012 - IPC E21B10/22 

FIELD: mining.

SUBSTANCE: support feature is design of a ball plug in the form of an eccentric two-stage rod with a common generatrix and its equipment with an insert, internal and external surfaces of which are eccentric, at the stage of the smaller diameter rod. At the same time the channel in the leg for a ball plug has a shape of two parallel cylinders, besides, the axis of the cylinder of larger diameter matches the axis of the external surface of the insert, and the axis of the cylinder of smaller diameter - the axis of the internal surface of the insert.

EFFECT: elimination of ball plug slippage and improved reliability of retaining bearing fixation, higher operability of the support and the drill bit as a whole.

2 dwg