| 摘要 |
A chuck for removably holding a drill bit or like tool element, including a conical sleeve and a plurality of jaws biased apart and away from the tool element against the inner sleeve face by compression springs, the sleeve being threaded onto a spindle and a thrust disc between the spindle and jaws operable upon sleeve rotation to shift the jaws axially of the sleeve to either tighten the jaws against or release the tool element, and a collar keyed to the spindle but movable axially along the spindle and journaled to the sleeve and having a socket for rotatably receiving a lock key which in turn has teeth that cooperates with teeth on the adjacent sleeve end operable to rotate the sleeve relative to the spindle.
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