Patent ID: 7866416

Claim:
A downhole tool string for use in drilling a subterranean formation, said downhole tool string comprising: a tool string with a drill bit located at a bottom of tool string bore; the drill bit including a body intermediate a shank and a working surface; the working surface including a substantially coaxial jack element with a portion of the jack element extending out of an opening formed in the working surface to engage the subterranean formation; a driving mechanism adapted to rotate the jack element; and a clutch assembly disposed within the tool string bore, the clutch assembly including a first end in communication with the jack element and a second end in communication with the driving mechanism, wherein the clutch assembly is within a housing, wherein the housing comprises at least one outer coupler, and wherein the outer coupler is adapted to move at different speeds than the drill bit; wherein the jack element is rotationally isolated from the drill bit.