Patent ID: 6095530
Filing Date: 2000-08-01
Classification: B23B,Y10S,Y10T

Abstract:
In a drill chuck having:a body centered on and rotatable about an axis and formed centered on the axis witha rearwardly open spindle hole,a forwardly open tool hole,a radially outwardly open groove having axially confronting inner and outer flanks, anda plurality of angled guide passages opening axially forward into the tool hole;respective jaws axially and radially displaceable in the guide passages and each formed with a row of teeth;a metallic tightening ring received in the groove, axially fixed but rotatable about the axis on the body, and having a screwthread meshing with the teeth, whereby rotation of the tightening ring displaces the jaws in their guide passages; the improvement whereinthe body is formed of plastic and includes an imbedded metallic reinforcement element having a frustoconical portion forming outside walls of the guide passages and a radially outwardly directed substantially planar flange at the outer flank of the groove, the jaws riding directly on the metallic element.