| 摘要 |
A drill chuck for preventing over-position operation. A drill body (1) of the drill chuck is provided with an elastic switch part (7). The elastic switch part (7) is matched with a stepped surface (41) in front of the thread of a clamping jaw (4). When the clamping jaw (4) retreats to approach the limit, the elastic switch part (7) is pressed under the action of the stepped surface (41) and is automatically upwarped and reset during releasing. The front end of a nut (3) is provided with a protrusion (31) matched with the elastic switch part (7). The protrusion (31) can be in contact with the pressed elastic switch part (7) during the rotating process of the nut (3) to form stop matching. By means of the drill chuck, the self movement of the clamping jaw can be used for switch operation. When the clamping jaw retreats to the bottom, the elastic switch part is pressed and is matched with the protrusion on the nut to limit further rotation of the nut, thereby preventing over-position operation and protecting the drill chuck. Moreover, the drill chuck has a simple structure, and is rather convenient to manufacture and assemble. |
