Rotary hammer and Bithalteanordnung for attaching a tool bits on a spindle of a rotary hammer

摘要

Rotary hammer (10) adapted to apply axial impacts to a tool bit (26), the rotary hammer (10) comprising: a motor (18), a spindle (22) coupled to the motor (18), to receive torque from the motor (18), a piston (50) at least partially received in the spindle (22) for reciprocating therein has an anvil (58) received in the spindle (22) is adapted to reciprocate as the piston (50) reciprocates with the anvil (58) exerting axial shocks on the tool bit (26) as the piston (50) approaches anda bit holder assembly (30) for securing the tool bit (26) to the spindle (22), the bit holder assembly (30) including a plurality of detent members (126) extending rearwardly from a foremost locking position to a first move the rearmost insertion position when the tool bit (26) is inserted into the spindle (22), a biasing member (74 ) configured to bias the latch members (126) to the lock position; and a collar (70) movable along the spindle (22) between a first axial position and a second axial position, the collar (70) being annular Wall having at least partially defining a pocket, a ring (150) cast with the sleeve (70) such that the ring (150) is fixed in the pocket, an inner surface of the ring (150) supporting the locking members (126). holds radially when the latch members (126) are in the locked position and the collar (70) is at the first axial position with a first end of the biasing member (74) received in the pocket when the latch members (126) engage the locking position, so that the first end of the biasing member (74) is held radially by the annular wall.