Patent ID: 6968811
Filing Date: 2005-11-29
Classification: B25C

Abstract:
1. A combustion-engined power tool, comprising a combustion chamber ( 1 ; 54 ); a cylinder ( 5 ) adjoining the combustion chamber ( 1 ; 54 ); a drive piston ( 8 ) displaceable in the cylinder ( 5 ) upon combustion of fuel in the combustion chamber; an ignition device ( 52 ) for igniting the fuel in the combustion chamber ( 1 ; 54 ) and cooling means ( 2 a , 6 a ; 64 ) at least partially integrated in a wall ( 2 ) of the combustion chamber ( 1 ; 54 ) for reducing temperature in the combustion chamber ( 5 ) by evaporation of a liquid cooling medium in the cooling means for creating under pressure therein to facilitate a return movement of the drive piston ( 8 ) in an initial position thereof.