Patent ID: 7240745

Claim:
A lubricating nutating single cone drill bit comprising: a bit shank having a drill string connection on a proximal end and an axially skewed bore formed in a distal end thereof; a plurality of bearings rotatably retaining a cutter body in the axially skewed bore, the cutter body having a plurality of cutter elements on a distal end; at least one lubricant chamber in the bit shank in communication with a first fluid port in the proximal end of the bit shank and containing a plunger displaceable by a drilling fluid to dispense a lubricant to the plurality of bearings; and an orifice on the distal end of the cutter body in communication with a fluid passage extending through the cutter body and the bit shank, the fluid passage in communication with a second fluid port in the proximal end of the bit shank adjacent the first fluid port.