| 摘要 |
<p>A chuck (15) for use with a manual or powdered driver having a rotatable drive shaft including a primary tightening mechanism utilizing a three-jaw (65) assembly actuated by a nut (80) or tightening ring and a supplemental tightening mechanism (95). The supplemental tightening mechanism (95) includes a camming portion (100) defining a tightening cam profile (105) and a release cam profile (110). The supplemental tightening mechanism further includes a plurality of lever bars (120), one end of each of the lever bars forming a cam follower (125) and the other end of each of the lever bars (120) operatively associated with the nut (80) so that when the supplemental tightening mechanism (95) is actuated in a tightening direction, the lever bars (120) will force the nut forward to produce an enhanced tightening force on the tool through the jaws (65), and when the rear sleeve (115) is rotated in a release direction, the force applied to the nut (80) by the lever bars (120) will be released.</p> |
