Noise reduction mechanism for percussion tools

The percussion hammer tool comprising:

• a spindle being driven by a drive means to rotate about an axis thereof;
• a percussion operating mechanism, slidably coupled with said spindle, for generating a percussion force to rotate and hit an anvil;
• said anvil being divided into an engaging portion engageable with said percussion operating mechanism and a tip tool holding portion for holding a tip tool;
• said engaging portion and said tip tool holding portion being arrayed sequentially with a clearance therebetween along an axis of said anvil, and angularly locked with each other;
• a torque transmitting mechanism transmitting an angular component of said percussion from said engaging portion to said tip tool holding portion, while making said engaging portion and said tip tool holding portion displaceable telescopically in an axial direction of said anvil;
• and
• a cushion member provided in said clearance space between said engaging portion and said tip tool holding portion, so that said cushion member suppresses noise produced from an axial component of said percussion force transferring from said engaging portion to said tip tool holding portion, wherein each of said engaging portion and said tip tool holding portion has similar configuration with a rear end of each of said engaging portion and said tip tool holding portion formed into a flange normal to said anvil ax, and said tip tool holding portion has a recess at the rear end thereof which is engaged with a front end of said engaging portion.