| 摘要 |
The invention relates to an apparatus for holding a workpiece (2) or tool having a tapered collar (1) or the like and having a pull-back rod (4) axially shiftable in a body (3) for actuating a chuck head (6) cooperating with jaws (5). The axial position of the pull-back rod (4) is maintained in a holding position without utilizing the force of a tension spring by a self-locking mechanism. |
