Chuck with jaw blade rotational stop

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

• a body member having a nose section and a tail section, said nose section having an axial bore formed therein and a plurality of angularly disposed passageways formed therethrough and intersecting said axial bore;
• a plurality of jaws slidably positioned in said angularly disposed passageways, each of said jaws having a tool engaging face formed on one side thereof and threads formed on an opposite outer surface thereof;
• a nut rotatably mounted on said body member, said nut having threads defined on an inner circumferential surface thereof in engagement with said threads on said jaws;
• a sleeve member in driving rotational engagement with said nut whereby when said sleeve is rotated with respect to said body member, said jaws will be moved thereby;
• and
• a rotational stop defined between said nut and said jaws wherein upon said jaws reaching a predetermined position within said passageways further rotation of said nut in an opening direction is prevented, said stop comprising a radially extending surface defining an end of said nut threads, said radially extending surface contacting a side surface of one of said jaws.