Patent ID: 7469908

Claim:
A power drill chuck comprising a drill body, a nut, jaws, a front sleeve, a rear sleeve, a nut sleeve, a rolling body, wherein three jaws are mounted respectively in three inclined holes which are trisection of the drill body, a nut thread constitutes a thread drive together with a thread of the jaws mounted in the three inclined holes of the drill body, the front sleeve is fixedly connected with the drill body, what is characterized in that the nut sleeve is fixedly connected to the nut and extends backwards, in a rear end of which a plurality of projecting keys are provided, the rear sleeve is mounted around the rear portion of the nut sleeve and may rotate relative to the nut sleeve and the drill body, the rear sleeve is provided with piecewise annular holes on its rear end surface and a plurality of keys on its inner end surface, a positioning sleeve is fixedly connected to the rear portion of the drill body to position axially the rear sleeve on the drill body, a plurality of elastic impact members are mounted between the nut sleeve and the rear sleeve, the elastic impact members are provided with a plurality of elastic deformation portions and a plurality of projecting keys.