Patent ID: 7520512

Claim:
A drill chuck comprising: a spindle that is adapted to be coupled to a source of rotational power; a plurality of jaw members slidably supported on the spindle; a threaded socket disposed about the spindle and threadably engaged with one of the jaw members and the spindle, the threaded socket including a plurality of first socket teeth and a plurality of second socket teeth that are configured differently than the first socket teeth; a spring disposed about the spindle; an impacting structure being disposed about the spindle and being biased toward the threaded socket by the spring, the impacting structure including a first set of structure teeth and a second set of structure teeth that are configured differently from the set of first structure teeth; and a changeover member disposed about the threaded socket and engaging the impacting structure, the changeover member being rotate-able between a first position, wherein the first and second socket teeth are axially spaced apart from the first and second structure teeth, and a second position, wherein the first and second socket teeth are not axially spaced apart from the first and second structure teeth; wherein the first socket teeth and the first structure teeth contact one another when the threaded socket is rotated in a first rotational direction relative to the impacting structure and the changeover member is disposed in the second position and wherein the second socket teeth and the second structure teeth contact one another when the threaded socket is rotated in a direction opposite the first rotational direction relative to the impacting structure and the changeover member is disposed in the second position.