Patent ID: 10272499

Abstract:
A self-locking drill chuck is disclosed herein. Among the rotating sleeve, the spring leaf and the nut, the nut is rotated by the rotating sleeve without being driven by the spring leaf, the spring leaf is loaded on the nut to rotate with the nut synchronously, under normal state, the locking end of the spring leaf is in a closed state against the teeth, and the self-locking drill chuck is also provided with a state switching part which is connected with the rotating sleeve and rotates with the rotating sleeve synchronously; the spring leaf is provided with a state switching matching structure. The nut is directly driven by a rotating sleeve without the spring leaf during the rotating process in the clamping direction or the releasing direction, which can enhance the hand feeling and efficiency in the clamping operation; the spring leaf has self-locking functions which can be in normally closed and the elastic force is opposite to the centrifugal force, greatly enhancing the reliability of the drill chuck self-locking structure.