Patent ID: 8215649
Filing Date: 2012-07-10
Classification: B23B,Y10T

Abstract:
1. A drill chuck with a chuck body that can be connected to a drill spindle and in which jaws forming a seat between themselves for the drilling tool are arranged in guide grooves running at an angle to the chuck axis, the jaws engaging with a row of teeth for opening and closing the drill chuck into the screwthread of a threaded ring rotatably guided on the chuck body, furthermore with a locking mechanism for the threaded ring consisting of a coaxial annular array of locking recesses and of at least one locking member that is engaged in the locking position under the force of a locking spring in the locking recesses, the locking member and the locking recesses resting on each other via inclined flanks in such a manner that they block the threaded ring against rotation in the direction of rotation corresponding to the opening of the drill chuck but when the threaded ring is rotated in the opposite, direction of rotation, that is, the one corresponding to the closing of the drill chuck, they press the locking member against the force of the locking spring out of the locking recesses and thus allow it to slide from locking recess to locking recess, furthermore with a coaxial tightening ring that can rotate between first abutments in a limited manner opposite the threaded ring, and with a latch forming two latching positions for the tightening ring in the circumferential direction wherein a locking ring that can rotate with end stops between second abutments of the tightening ring in a limited manner is provided for shifting the locking member between the locking position and the release position corresponding to the position of the locking member disengaged from the locking recesses, that the second abutment, that is the front one in the direction of rotation corresponding to the opening of the drill chuck, rests in the locking position on the end stop, and that the latch is formed between the locking ring and the threaded ring.