Patent ID: 7654539
Filing Date: 2010-02-02
Classification: B23B,Y10S,Y10T

Abstract:
1. A locking drill chuck comprising: a chuck body, a plurality of jaws, a nut, a front sleeve, and a rear sleeve, wherein the chuck body has an axial hole at its rear end for engaging with a driving shaft of a driving means, and the rear sleeve close fits with the outer circumference of the rear end of the chuck body, the jaws are separately fitted in a plurality of corresponding inclined holes equally departed away from each other in the chuck body, the nut engages with the jaws, a locking sleeve provided between the front sleeve and the rear sleeve, and connected with the front sleeve; and a locking assembly provided between the nut and a stop surface of the chuck body, the locking assembly includes rolling members and a locking plate, wherein the locking plate connects with the locking sleeve, and has a plurality of eccentric arc grooves in an end plane thereof facing the stop surface of the chuck body, the rolling members are received in the eccentric arc grooves, the stop surface of the chuck body includes a conical portion and a plane portion, wherein the rolling members change from contacting and pressing against the conical portion to contacting and pressing against the plane portion of the stop surface when the locking plate rotates.