Patent ID: 6053507
Filing Date: 2000-04-25
Classification: B23B,Y10S,Y10T

Abstract:
A chuck assembly for a tool bit, comprising:a hollow cylindrical chuck body having a front end, a rear end, and a surrounding wall having an inner surface defining a receiving chamber which opens at said front end and which is adapted for receiving one end of the tool bit, said inner surface being formed with a plurality of angularly spaced inclined guiding channels which extend from said rear end toward said front end and which converge in a direction toward said front end, each of said guiding channels having a substantially rectangular cross-section, said surrounding wall having an outer surface formed with an annular retaining groove accessing said guiding channels;a plurality of clamping members received slidably and respectively in said guiding channels, each of said clamping members having a cross-section corresponding to that of the respective one of said guiding channels, and an outer side surface formed with an external thread; anda drive ring provided rotatably in said retaining groove of said chuck body and having an inclined inner surface formed with an internal thread meshing with said external threads of said clamping members;whereby, rotation of said drive ring relative to said chuck body results in linear movement of said clamping members in said guiding channels, said linear movement being adapted for clamping or loosening the tool bit received in said receiving chamber.