Patent ID: 7690871
Filing Date: 2010-04-06
Classification: B23B,Y10S,Y10T

Abstract:
1. A power driver comprising: a. a housing; b. a rotatable drive shaft extending therefrom; and c. a chuck, said chuck comprising, a generally cylindrical body having a nose section and a tail section 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 plurality of jaws slidably positioned in each of said angularly disposed passageways, each of said jaws having a jaw face formed on one side thereof and threads formed on the opposite side thereof; a nut rotatably mounted on said body in engagement with said threads on said jaws so that rotation of said nut moves said jaws axially within said passageways; a first generally cylindrical sleeve having an inwardly depending annular lip, said first sleeve being disposed about said nose section of said cylindrical body, said first sleeve being rotationally fixed to said nut and axially fixed with respect to said body; a second generally cylindrical sleeve disposed about said body and over a portion of said first sleeve, which in a first state is rotatable with respect to said housing and rotationally fixed to said body and in a second state is rotationally fixed to said housing and said first sleeve; a nut retaining member pressed to said nose section of said body and having a nut contact portion for retaining said nut in its operative position; and a nosepiece having a first sleeve contact portion fixed on said nose section of said body for axially retaining said first sleeve in said operative position, wherein said annular lip of said first sleeve is received between said nut retaining member and said first sleeve contact portion of said nosepiece.