DRILL BIT WITH BLOWING FACE BY AIR AND SEALING OF ROLLING CUTTER BEARINGS Russian patent published in 2013 - IPC E21B10/24 

FIELD: mining.

SUBSTANCE: proposed drill bit comprises body composed by three sections with connection thread welded together, blowout channel for cleaning face of sludge, assemblies to compensate for lubrication consumption in bearings with resilient membranes and channels feeding pressure thereto, rolling cutters with rock rutting teeth articulated to leg journals by means sliding and rolling bearings. Air is forced to said membranes via feed channels made in leg ledge on nipple side and compensation assy side and via hollow tubes secured by one end to inlet of said feed channels and open on opposite side into bit nipple cavity.

EFFECT: higher safety and reliability.

1 dwg