A chuck for use with a manual or powered driver having a housing and a rotatable drive shaft extending therefrom is provided. The chuck includes a generally cylindrical body member having a nose section and a tail section. Each of a plurality of jaws is slidably positioned in one of a plurality of angularly disposed passageways in the body. Each jaw has a jaw face formed on one side thereof and threads formed on the opposite side thereof. A nut is rotatably mounted on the body in engagement with the jaw threads so that rotation of the nut moves the jaws axially within the passageways. A locking member, in a first axial position, is rotatable with respect to the driver housing. In a second axial position, it operatively engages the housing and the nut so that the locking member is rotationally held to the housing and the nut so that the nut is rotationally held to the housing. The locking member is axially reciprocal between the first axial position and the second axial position.
1. A chuck for use with a manual or powered driver having a rotatable drive shaft, comprising:
a generally cylindrical body having a nose section and a tail section, said tail section configured to mate with said drive shaft so that said body rotates with said drive shaft and 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 an 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 sleeve in operative engagement with said nut such that said sleeve and said nut are moveable with respect to each other between a first position and a second position;
a bearing having a first race adjacent said body, a second race adjacent said sleeve, at least one bearing element disposed between said first race and said second race, said first and said second races being interdependently retained to each other in the axial direction;
wherein in said first position said nut and said body are rotatable with respect to each other upon application of relative torque between said nut and said body when said jaws are between rearwardmost and forwardmost positions in said jaw passageways; and
in said second position, when said jaws are in the forwardmost position, said sleeve is moveable in a closing direction with respect to said body only upon application of a predetermined torque to said sleeve with respect to said body and, upon application of said predetermined torque, said sleeve moves rotationally with respect to said body and drives a spring-biased formation over at least one opposing tooth that is rotationally retained to said body.