Patent ID: 7357380

Claim:
A manually operated tool having an internal combustion engine and a handle system, comprising: an anti-vibration element operatively disposed between the internal combustion engine and the handle system to prevent transmission of vibrations from the internal combustion engine to the handle system, wherein said anti-vibration element includes a coil spring, and an additional mass disposed on said coil spring, wherein said entire additional mass is held on said coil spring with play, wherein said additional mass is freely movable relative to said coil spring by a certain amount, wherein said additional mass is held loosely on at least one coil of said coil spring, wherein said additional mass comes into contact with said coil spring during operation of said tool when said coil spring begins to vibrate, and wherein due to such contact with said coil spring said additional mass is accelerated by said coil spring, thereby disturbing the formation of resonance of said coil spring to prevent formation of inherent vibrations in said coil spring.