Patent ID: 7159691

Claim:
Casing ( 10 ) for a combustion engine powered tool that is carried on the back of the operator, wherein the casing ( 10 ) covers and supports all noise generating components in the tool, the casing ( 10 ) comprising: an air inlet ( 20 ) comprising an opening in a lower part of the casing ( 10 ) for providing air from outside the air inlet ( 20 ) to the noise generating components inside the casing ( 10 ); a gasoline tank ( 21 ) provided outside of the air inlet ( 20 ) and within the lower part of the casing ( 10 ), the tank ( 21 ) being arranged between the lower part and the air inlet ( 20 ) so that the tank ( 21 ) provides a sound wave trap that reduces the amount of sound waves that leave the casing ( 10 ) through the air inlet ( 20 ).