Patent ID: 7063332

Claim:
Chuck ( 1 ) for tools, especially screwdriver bits with a polygonal section ( 2 ), the chuck comprising: a polygonal cavity ( 3 ) for the insertion of the polygonal section ( 2 ), a wall ( 4 ) of the polygonal cavity ( 3 ) having a window ( 5 ) in which is disposed a pressure-piece ( 6 ) which is displaceable in an insertion direction (E); wherein, in order to secure the inserted polygonal section ( 2 ) against being drawn out, the pressure-piece ( 6 ) is forced against the polygonal section ( 2 ), in a direction transverse to the insertion direction (E), by a sloping inner wall ( 9 ) of an actuating element; wherein the actuating element is outside the window and is retained in a clamping position by a restoring spring ( 10 ) acting in the insertion direction (E), and which, in a release position of the actuating element ( 7 ), can move aside out of the polygonal cavity ( 3 ) in order for the polygonal section ( 2 ) to be drawn out; and wherein the pressure-piece ( 6 ) is subjected to the action of a compression spring ( 8 ) acting counter to the insertion direction (E) and, upon a displacement counter to the direction of spring action of the compression spring, the pressure-piece ( 6 ) can move aside out of the polygonal cavity ( 3 ).