Chuck with helical jaw bite

A chuck for use with a manual or powered driver having a rotatable drive shaft, said chuck comprising:

• a generally cylindrical body having a nose section and a tail section, said tail section being configured to rotate with said drive shaft, said nose section having an axial bore formed therein and a plurality of angularly disposed passageways formed therethrough and intersecting said axial bore;
• a generally cylindrical sleeve disposed about said chuck body;
• a threaded nut disposed about said body and in communication with said sleeve;
• and
• a chuck jaw moveably disposed in each said passageway toward and away from said axial bore, wherein each said jaw includes
• a back surface opposite a longitudinal tool engaging ridge, a first side surface extending from said longitudinal tool engaging ridge toward said back surface, and a second side surface extending from said longitudinal tool engaging ridge toward said back surface and wherein said first side surface and said second side surface are disposed on either side of a plane that includes said chuck axis, wherein each
• said longitudinal tool engaging ridge faces and is generally parallel to the axis of said axial bore, wherein each said longitudinal tool engaging ridge defines a plurality of grinds, wherein each said grind is disposed in a plane that is non-perpendicular to said chuck axis and extends from said first side surface to said second side surface and wherein each said grind at said first side surface is closer to a forward end of each said chuck jaw than a corresponding portion of said grind at said second side surface, and
• wherein rotation of one of said nut and said sleeve with respect to said body drives said jaws toward or away from said axial bore.