Patent ID: 7107690

Claim:
An electric cutting tool comprising: a body having an end; a chuck at the end of the body for attaching a cutting implement having a rear end including a recess or a hole; and a drive mechanism including an electric motor in the body for driving the chuck to slide in reciprocation for operating the cutting implement for cutting, wherein the chuck comprises: a cylindrical core including a slot for receiving the rear end of the cutting implement; a reinforcing tube surrounding and fixedly mounted on an outer surface of the core; fixing means for engaging the recess or hole of the cutting implement in the slot; and a double layer outer member surrounding and coaxial with the core and reinforcing tube and rotatable relative to the core and reinforcing tube, the outer member including an internal member having an interior cam surface acting upon the fixing means, and an external member engaging the internal member at an exterior surface of the internal member and an interior surface of the exterior member, the outer member being manually rotatable relative to the core and reinforcing tube between a locked position in which the interior cam surface presses the fixing means against the recess or hole of a cutting implement inserted into the slot to fix the cutting implement in place and an unlocked position in which the fixing means is released from the cutting implement.