Chuck for a percussion hand-held power tool

A chuck for a percussion hand-held power tool, comprising a coupling sleeve (3) for receiving a working tool and having two diametrically opposite, slot-shaped, radial openings (4, 4′);

• two locking members (5) radially and axially displaceable in respective radial openings (4, 4′);
• a locking sleeve (6) surrounding the coupling sleeve (3) and the locking members (5) and having an inner surface (7) radially expanding in a direction opposite to an operational direction of the working tool;
• and a spring-biased push-sleeve (8) formlockingly cooperating with the locking members (5), wherein the locking members (5) are supported against the inner surface (7) of the locking sleeve (6), extend into an interior of the coupling sleeve (3), and have each a radial dimension greater than a thickness of the coupling sleeve wall and a width decreasing toward a chuck axis (A) and wherein the push-sleeve (8) has an at least partially radially extending stirrup (16) axially formlockingly engaging in at least partially radially extending grooves (17) of respective locking members (5).