Patent ID: 6247706
Filing Date: 2001-06-19
Classification: B23B,Y10S,Y10T

Abstract:
A self-locking chuck for a rotational spindle, the chuck comprising:a cylindrical body having a forward section, a collar and a rearward section, the forward section having a center hole formed therethrough, the collar being provided with a plurality of angularly disposed guide channels, and the rearward section being mountable on the spindle of a driving device;a plurality of jaw members slidably disposed in the guide channels, each jaw member having a threaded surface formed on an outer side thereof;a threaded socket disposed about the collar of the body in threaded engagement with the threaded surfaces of the jaw members, the threaded socket having a plurality of recessed holes and a plurality of teeth;a socket coveraxially mounted around the body to permit threaded engagement of the threaded socket and jaw members;a top cover shell and a bottom cover shell covering the forward section and rearward section of the body;a flexible thrust bearing ring assembly inserted in the bottom cover shell, the ring assembly including a spring and a thrust bearing ring for flexibly supporting the top cover shell, the thrust bearing ring being rotatable by the top cover shell for engaging the threaded socket;a sleeve mounted on the forward portion of the body for axially positioning the top cover shell and socket cover;two bearing assemblies inserted between the threaded socket and collar, and between the sleeve and upper cover shell;a joint member inserted through the bottom cover shell and joined to the driving device for preventing the cover shell from rotating with the spindle during operation; andwherein by rotating the top cover shell, a user may manipulate the upper and lower axial positions of the thrust bearing ring by engaging the threaded socket and provide a chucking and self-locking function.