| 摘要 |
A drill chuck has a body centered on and rotatable about an axis and formed centered on the axis with a rearwardly open spindle hole, a forwardly open tool hole, and a plurality of angled guide passages opening axially forward into the tool hole. Respective jaws axially and radially displaceable in the guide passages are each formed with a row of teeth in mesh with an internal thread of a metallic tightening ring axially fixed but rotatable about the axis on the body. Thus rotation of the tightening ring displaces the jaws in their guide passages. The body is formed of plastic and includes an imbedded metallic reinforcement element which has a frustoconical portion forming outside walls of the guide passages and the jaws ride directly on the metallic element. Furthermore the body is formed with a radially outwardly open groove receiving the tightening ring and having axially confronting inner and outer flanks and the metallic element has a radially outwardly directed substantially planar flange at the outer flank of the groove.
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