Patent ID: 7350592

Claim:
A power tool comprising: a housing 4 ; a motor 18 mounted within the housing 4 ; a tool holder 20 rotatably mounted on the housing 4 for holding a cutting tool; a striker 42 mounted in a freely slideable manner within the housing, for repetitively striking an end of a cutting tool when a cutting tool is held by the tool holder 42 , which striker is reciprocatingly driven by the motor 18 , when the motor 18 is activated, a drive mechanism operatively connected between the motor and the striker, the drive mechanism including: a drive member 46 which is capable of being rotatingly driven by the motor 18 ; a driven member 48 ; and the driven member is connected to the drive member 46 by at least one cam 54 and cam follower 56 , 100 ; 200 , and to the striker 42 via a spring 44 ; 206 ; and wherein rotation of the drive member 46 relative to the driven member 48 results in a reciprocating motion of the driven member 48 which in turn reciprocatingly drives the striker 42 via the spring 44 ; 206 , and in a first mode of operation the motor simultaneously drives in rotation both the drive member and the driven member.