Patent ID: 7325712

Claim:
An electrical drive-in tool for driving in fastening elements, comprising: a guide ( 12 ); a driving ram ( 13 ) displaceable in the guide ( 12 ); and a drive unit ( 30 ) including: a drive flywheel ( 32 ) having: a hub; a first component forming at least a circumferentially arranged rim and formed of steel having a density from about 7 g/cm 3 to about 8.4 g/cm 3 ; a second component forming an annular body positioned between the circumferentially arranged rim and the hub of the drive flywheel ( 32 ), with the second component being formed of a material having a density greater than 8.5 g/cm 3 and also greater than at least 1 g/cm 3 of the density of the steel of which the first component is formed; a motor ( 31 ) for rotating the drive flywheel ( 32 ); and wherein the second component is formed of metal selected from the group consisting of lead, copper, nickel, tin and silver.