A chuck including a body having a tail section and a nose section defining an axial bore. A plurality of jaws are movably disposed with respect to the axial bore and a nut is in threaded engagement with the jaws. A sleeve engages the nut so that rotation of the sleeve moves the jaws. A first ring defines a plurality of teeth and a second ring is rotatable relative to the nut over a limited arc and defines at least one pawl. In a first state, the second ring is non-rotatable relative to the first ring in both the opening and closing directions, and in a second state the first and second rings are rotatable about the body, and the second ring is rotatable relative to the first ring in the closing direction.
1. A chuck for securing a tool with a shank to a manual or powered driver having a drive shaft, said chuck comprising:
a. a generally cylindrical body having a nose section and a tail section, said nose section having an axial bore formed therein;
b. a plurality of jaws movably disposed with respect to said body in communication with said axial bore, said jaws defining a tool engaging surface on one side thereof and a first plurality of threads on an opposite side;
c. a nut rotationally mounted on said body and defining a plurality of threads on an inner circumference thereof, said nut being in threaded engagement with said jaws such that rotation of said nut causes said jaws to move with respect to said body;
d. a generally cylindrical sleeve rotatably mounted about said body and in driving engagement with said nut so that rotation of said sleeve in a closing direction moves said jaws toward said axial bore and rotation of said sleeve in an opening direction moves said jaws away from said axial bore;
e. a first ring defining a plurality of teeth formed thereon; and
f. a second ring that is rotatable relative to said nut over a limited arc and that defines at least one pawl thereon, said at least one pawl being biased toward said first ring of teeth so that,
when said chuck is in a first state, said second ring is non-rotatable relative to said first ring in both said opening and closing directions, said first ring and said second ring being rotatable about said body, and
when said chuck is in a second state in which said jaws clamp onto the shank of the tool, said second ring is rotatable relative to said first ring in said closing direction but is non-rotatable relative to said planar first ring in said opening direction.
2. The chuck of claim 1 , wherein said sleeve is non-rotatably coupled to said nut.
3. The chuck of claim 1 , wherein said first ring further comprises a planar first ring.
4. The chuck of claim 3 , wherein said body further includes a thrust ring and said planar first ring is disposed intermediate said nut and said thrust ring.
5. The chuck of claim 4 , further comprising a bearing assembly disposed intermediate said nut and said planar first ring.
6. The chuck of claim 1 , further comprising a shield cap rotatably secured to said nose section of said body.
7. The chuck of claim 6 , wherein said shield cap extends rearwardly over a portion of said sleeve.
8. The chuck of claim 7 , said sleeve including a forwardly facing annular groove, said shield cap including a rearwardly depending annular ledge, wherein said annular ledge extends into said annular groove.
9. The chuck of claim 6 , further comprising a nose piece non-rotatably secured to said nose section of said body, said shield cap further comprising an inwardly depending ledge, said inwardly depending ledge being rotatably secured intermediate said nose piece and said nose section of said body.
10. The chuck of claim 6 , wherein said sleeve is non-rotatably fixed to said nut.
11. The chuck of claim 1 , wherein when said chuck is in a second state, rotation of said second ring relative to said first ring in said closing direction causes an audible click.
12. A chuck for securing a tool with a shank to a manual or powered driver having a drive shaft, said chuck comprising:
a. a generally cylindrical body having a nose section and a tail section, said tail section being configured to rotate with the drive shaft of the driver and said nose section having an axial bore formed therein;
b. a plurality of jaws movably disposed with respect to said body in communication with said axial bore, said jaws defining a tool engaging surface on one side thereof and a first plurality of threads on an opposite side;
c. a nut rotationally mounted on said body and defining a plurality of threads on an inner circumference thereof, said nut being in threaded engagement with said jaws such that rotation of said nut causes said jaws to move with respect to said body;
d. a generally cylindrical sleeve rotatably mounted about said body and in driving engagement with said nut so that rotation of said sleeve in a closing direction moves said jaws toward said axial bore and rotation of said sleeve in an opening direction moves said jaws away from said axial bore;
e. a first ring defining a plurality of teeth formed thereon; and
f. a second ring that is rotatable relative to said nut and defines at least one pawl thereon, said at least one pawl being biased toward and continuously engaging said first ring of teeth so that,
when said chuck is in a first state, said second ring is non-rotatable relative to said first ring in both said opening and closing directions, said first ring and said second ring being rotatable about said body, and
when said chuck is in a second state in which said jaws clamp onto the shank of the tool, said second ring is rotatable relative to said first ring in said closing direction causing an audible click but is non-rotatable relative to said first ring in said opening direction.
13. The chuck of claim 12 , wherein said body further includes a thrust ring and said first ring is disposed intermediate said nut and said thrust ring.
14. The chuck of claim 12 , further comprising a shield cap rotatably secured to said nose section of said body.
15. The chuck of claim 14 , wherein said shield cap extends rearwardly over a portion of said sleeve.