Patent ID: 6612587
Filing Date: 2003-09-02
Classification: B23B,Y10S,Y10T

Abstract:
A manually tightened chuck comprising:a hollow chuck body member, said chuck body member including three inclined bores inclined forwardly and toward a central axis and being equally spaced; a jaw disposed slidably in each inclined bore; a nut sleeved over said chuck body member, said nut being interconnected with each said jaw through cooperating threads; a front sleeve disposed on a peripheral surface of said nut and operably engaged with said nut by torque transmission structure, said front sleeve including a stepped bore formed in a rear end of said front sleeve; a rear sleeve disposed over a peripheral surface of said chuck body member; a middle portion of said chuck body member including a stepped part extended radially outwardly, said stepped part including a facing surface opposite a rear end surface of said nut; a steel sleeve disposed in said stepped bore of said front sleeve; a blocking sleeve engaged with said steel sleeve and including an end wall extended radially inwardly and having a lower surface resting against an upper surface of said stepped part of said chuck body member; circular groove means formed in at least one of said facing surface and said rear end surface of said nut; and a plurality of bearing balls disposed in said groove means.