| 摘要 |
<p>Provided are a component for a collet chuck having increased tool holding force, a collet, a tightening nut, and a collet chuck.The collet chuck (10) has a chuck body (20) having a tapered hole (22) tapered toward the end of the hole, a diameter-reducible collet (40) having a first tapered surface (4 4) fitted to the tapered hole (22), and a tightening nut (60) screwed to the chuck body (20). The collet chuck also has a boosting collet (80) having a first contact surface (82) and a second contact surface (86) that are in con tact with a second tapered surface (46) and a third tapered surface (70), re spectively. The second tapered surface (46) is formed on the outer periphera l surface of the forward end of the collet (40) and tilted such that its out er diameter is reduced toward the forward end. The third tapered surface (70 ) is formed on the inner peripheral surface of the forward end of the tighte ning nut (60) and tilted such that its inner diameter is reduced toward the front end. With the tightening nut (60) tightened to the chuck body (20), th at portion of the boosting collet (80) that is located forward of the first contact surface (82) is not in contact with the outer peripheral surface of the collet (40) when the collet (40) is pressed forward.</p> |
