Drill chucks

An improvement comprising a drill chuck provided with a body part having a formed portion in which jaws are slidably mounted for converging movement in respective bores and a cylindrical rear portions;

• a circumferential groove encircling said body part between said forward and rear portions, a nut member rotatably mounted on the body part and axially located in the circumferential groove, said nut member having screw threads for engagement with threads on said jaws for advancing said jaws through a forward portion of the body part to grip a drill shank, and for retracting said jaws;
• a gear element formed on the nut member with which the teeth of an extraneous chuck key may be engaged to rotate said nut member with respect to the body to tighten or slacken the jaws;
• and a cylindrical sleeve and partially encompassing connected to said nut member and extending rearwardly of the body part and having a radially internal flange portion to rotatably engage said cylindrical portion of the body part remote from the nut member, the improvement comprising abutment means on said cylindrical rear portion and acting between the cylindrical sleeve flange portion and the portion of the body part with which it is rotatably engaged, for holding said sleeve in its required position in relation to the nut member, said abutment means being formed by a shoulder means encircling the body part in the region supporting an end of the cylindrical sleeve, the internal diameter of said flange portion being less than the diameter of said abutment whereby the sleeve is press fitted over said abutment into engagement with said nut member.