Patent ID: 7121359

Claim:
A drilling hammer comprising a hammer tube ( 13 ) that is rotatably supported in a housing ( 10 ), the hammer tube being rotationally driveable by a driven wheel ( 31 ) of a gear unit ( 30 ) sitting on the hammer tube ( 13 ), with a striking tool ( 14 ) located in the hammer tube ( 13 ), the striking tool including a piston ( 15 ) that can be driven with a reciprocating motion, and an operating mode change-over switch ( 35 ) for the “impact drilling” and “chiseling” operating modes, the operating mode change-over switch including a manually actuatable control button ( 36 ) and a switching mechanism ( 37 ) connected with the control button ( 36 ), the switching mechanism coupling the hammer tube ( 13 ) to the driven wheel ( 31 ) when in the “impact drilling” operating mode of the control button ( 36 ) and fixing the hammer tube in a non-rotative manner in the housing ( 10 ) when in the “chiseling” operating mode, wherein the switching mechanism ( 37 ) includes an actuator ring ( 45 ) fixed on the hammer tube ( 13 ) in an axially displaceable and torsion-proof manner, the actuator ring including at least one radially projecting locking spline ( 51 ) on its outer side facing away from the hammer tube ( 13 ), the locking spline being designed to slide in an axial direction direction in a form-locked manner into at least one axial recess ( 52 ) in the driven wheel ( 31 ) and into locking toothing ( 53 ) in the housing, and wherein, to fix the actuator ring ( 48 ) in a torsion-proof and axially displaceable manner on the hammer tube ( 13 ), the actuator ring ( 48 ) includes at least one radially projecting guide spline ( 49 ) on an inner side facing the hammer tube ( 13 ), and the hammer tube ( 13 ) includes at least one axial guide groove ( 50 ) on an outer side facing the actuator ring ( 48 ), in which the guide spline ( 49 ) is situated in the circumferential direction in a form-locked manner.