| 摘要 |
A drill chuck includes a chuck body connected to a drilling spindle and having a tool holding fixture for retaining a drill bit between jaws. Accommodated in the chuck body is a through-passage which leads to the tool holding fixture and through which the impact of the spindle onto the drill bit is transmitted. A tightening ring is rotatable about the chuck body in order to allow loosening and tightening of the drill bit and is connected to an adjusting sleeve which is arranged at a distance to the chuck body to define an annular space therebetween. In order to allow discharge of any dirt penetrating through the jaws and into the tool holding fixture channels are provided between one end of the annular space and the tool holding fixture. The other end of the annular space is connected to the outside so that dirt can be transported through the channels and the annular space towards the outside.
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