Patent ID: 7861797

Claim:
An at least partially rotating and axially percussive hand-held machine tool having a tool receptacle for receiving a tool, comprising: an impact mechanism ( 5 ) having a guide tube ( 6 ) in which a percussion piston ( 7 ) is driven in an axially percussive manner by a pneumatic spring ( 8 ); a driving motor ( 15 ); a slip clutch ( 10 ), encloses the guide tube ( 6 ), is provided axially with cams ( 9 ) having torque-transmitting flank surfaces ( 20 ), and has a driving sleeve ( 11 ) and a driven sleeve ( 12 ) which are biased axially towards one another under pressure by a spring ( 13 ), and a control sleeve ( 14 ) which is driven in rotation by the driving motor ( 15 ) for driving the driving sleeve ( 11 ) to, thereby, drive in rotation the slip clutch ( 10 ); wherein the driving sleeve ( 11 ) is connected by positive engagement to the control sleeve ( 14 ) coaxial to the driving sleeve ( 11 ) by balls ( 18 ) which partially engage, respectively, in two control contours ( 19 a , 19 b ) of the driving sleeve ( 11 ) and of the control sleeve ( 14 ), which control contours ( 19 a , 19 b ) are arranged partially opposite one another, and wherein the driving sleeve ( 11 ) is positively guided in such a way that the driving sleeve ( 11 ), which is axially biased under pressure by the spring ( 13 ), is displaced axially away from the driven sleeve ( 12 ) and rotated relative to the control sleeve ( 14 ) when a limiting torque is exceeded and then is displaced axially towards the driven sleeve ( 12 ) under action of the spring ( 13 ), whereby the driving sleeve ( 11 ) strikes the driven sleeve ( 12 ) with the torque-transmitting flank surfaces ( 20 ) so that a rotational energy of the driving sleeve ( 11 ) is transformed into a brief tangential percussion which is transmitted to the tool by the tool receptacle.