Patent ID: 6550785
Filing Date: 2003-04-22
Classification: B23B,Y10T

Abstract:
A drill chuck comprising:a chuck body rotatable about a chuck axis and formed centered on the axis with an axially forwardly open tool receiving hole, an array of axially extending guides opening axially forward into the hole, an axially forwardly directed rear shoulder and a front shoulder having an axially forwardly directed front surface; respective externally toothed jaws axially displaceable in the guides; an internally threaded actuating ring meshing with the jaws and rotatable on the chuck body about the axis to axially displace the jaws in the respective guides; an elastically deformable support washer bearing axially forward on the actuating ring and having an inner periphery bearing axially backward on the rear chuck-body shoulder, the washer having a radial dimension and bearing on the rear chuck-body shoulder over a radial distance equal to at most one-half the washer dimension such that the support ring projects at least halfway from the chuck body; and a tightening sleeve axially and rotationally coupled to the actuating ring and having an axially rearwardly directed front surface axially confronting the front chuck-body shoulder surface, the sleeve and ring being axially displaceable on rearward elastic deformation of the support washer from a forward position with the front shoulder surface out of contact with the front sleeve surface when the washer is generally undeformed and a rear position with the front sleeve surface bearing axially backward on the front shoulder surface when the washer is elastically rearwardly deformed.