Patent ID: 7510464
Filing Date: 2009-03-31
Classification: B24B,B25F,F16F,F16H,Y10T

Abstract:
1. An electric hand machine tool vibration damping device, comprising: a rotation element connectable to a drive shaft of an electric hand machine tool in a frictional, nonpositive way, whereby the rotation element is integrated in a crown gear, wherein said crown gear transmits a rotation of an electric motor to the drive shaft, said rotation element having at least one chamber, wherein said at least one chamber is configured as an annular cavity; a fluid material capable of absorbing vibration energy, said at least one chamber being filled with said material; and at least one damping element accommodated in a freely moving fashion in said at least one chamber and capable of moving in said material, wherein said damping element is provided with a plurality of recesses for increasing its frictional resistance in relation to the fluid, wherein said damping element is substantially annular and accommodated in said annular cavity, wherein said damping element has an annular radius that is the same as an annular radius of said cavity, and wherein said damping element has a smaller cross-section than a cross-section of said cavity.