| 摘要 |
A tool chuck according to this invention comprises a locking device disposed between a chuck body and chuck claws slidable by screw feeding. The locking device presses and locks to the chuck body by a reaction force occurring when the chuck claws clamp a tool. The tool chuck further comprises a torque amplifying device disposed between the locking device and a control ring rotatably mounted on the chuck body. When the locking device is locked to the chuck body, the torque amplifying device reduces rotation of the control ring to output an amplified torque to a screw ring which screw-feeds the chuck claws. The chuck claws are slidable fast until the chuck claws clamp a tool inserted in position to realize a quick clamping action. When the chuck claws contact and hold the tool, the chuck claws are slidable with an increased torque, thereby holding the tool with a strong clamping force.
|
