Patent ID: 7059430

Claim:
A rolling cone rock bit, comprising: a drill bit body having a circumference, and defining a longitudinal axis, a top, a bottom, and a gage diameter; a first leg formed from said drill bit body, said first leg providing a mud flow ramp from a leading edge of said first leg, wherein said mud flow ramp comprises a top, a first section, and a second section connected serially to said first section, wherein said first and second sections are disposed at different angles to a line perpendicular to said longitudinal axis, a junk slot defined by said mudflow ramp, said drill bit body, and a junk slot boundary line; a first rolling cone rotatably attached to said drill bit body; a nozzle boss formed from said drill bit body, said nozzle boss having a bottom, a top, and a sidewall; and wherein said junk slot is further defined by said nozzle boss sidewall, wherein said junk slot has a cross-sectional area at each height along said junk slot, and wherein a cross-sectional area exists between said nozzle boss, said mudflow ramp, said drill bit body, and said junk slot boundary line, said cross-sectional area increasing from said bottom of said nozzle boss to said top of said nozzle boss.