Patent ID: 7712548
Filing Date: 2010-05-11
Classification: B25D

Abstract:
1. A hand-held power tool, comprising a housing ( 2 ); a pneumatic percussion mechanism ( 3 ) located in the housing ( 2 ) and including an anvil ( 5 ) and a percussion piston ( 4 ) for applying blows to the anvil ( 5 ); at least one oscillation damper ( 6 , 6 ′) for damping axial oscillations of the anvil ( 5 ) produced by a rebounding working tool ( 10 ), the at least one oscillation damper ( 6 , 6 ′) including an oscillation damping mass ( 7 , 7 ′) and at least one spring ( 8 a , 8 a ′) for compressively preloading the damping mass ( 7 , 7 ′) against the housing ( 2 ); and an axially displaceable excitation member ( 9 ) engageable by the anvil ( 5 ) in an operational position of the anvil ( 5 ) for transmitting the axial oscillations of the anvil ( 5 ) to the oscillation damper ( 6 , 6 ′) for actively exciting the oscillation damper ( 6 , 6 ′) when the anvil ( 5 ) occupies the operational position thereof.