| 摘要 |
A chuck that automatically tightens or loosens the jaws of the chuck in response to rotation of a power tool drive shaft or gearbox shaft is disclosed. The chuck has a body, a plurality of jaws and an adjustment ring that is threadably engaged with the jaws. The chuck body and the adjustment ring are each selectively rotationally coupled to the gearbox shaft of the power tool. The chuck body is also selectively rotationally coupled to the power tool housing. A mode selector is provided for placing the chuck in either drill mode or auto-lock mode. In drill mode, the chuck body is rotationally coupled to the gearbox shaft and is rotatable relative to the power tool housing, thereby allowing the chuck body to be rotationally driven by the gearbox shaft. In auto-lock mode, the adjustment ring is rotationally coupled to the gearbox shaft and the chuck body is rotationally coupled to the power tool housing to allow the adjustment ring to be rotationally driven by the gearbox shaft relative to the chuck body so as to tighten or loosen the jaws.
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