Patent ID: 6409181
Filing Date: 2002-06-25
Classification: B23B,Y10S,Y10T

Abstract:
A combination type electric drill chuck structure, said chuck comprising:a drive body that is generally a cylindrical shaft having head and tail ends, the middle thereof being provided with a plurality of inclined grooves for receiving multiple clamp pawls; a fixed shell that is a generally U-shaped shell having upper and lower openings, said lower opening being provided with a securing hole for securing to said tail end of said drive body in tight fit; a sleeve threaded seat that is a generally inverted-U shaped seat having upper and lower openings, and that is threadedly provided at said head end of said drive body for engagement with said clamp pawls, a middle thereof being provided with outer threads; a percussion ring unit provided with a spring and a percussion ring and fitted on said sleeve threaded seat; a movable shell fitted on said percussion ring unit, an upper opening thereof matching fittingly an annular cap, said annular cap being subjected to action of said spring to form an abutting face during displacement of said movable shell; and an adjusting ring provided within inner threads to be mounted threadedly on said sleeve threaded seat so as to abut against said annular cap of said movable shell.