Patent ID: 7637328

Claim:
An electrical power tool comprising: a housing; an electrical motor accommodated in the housing; a motion conversion mechanism configured to convert a rotary motion of the electrical motor into a reciprocation motion; a counterweight mechanism supported at each of two opposite ends of the mechanism on the housing for reducing the vibration of the tool, the counterweight mechanism including a weight-supporting member extending in a direction perpendicular to directions of the reciprocation motion and capable of being elastically deformed in the directions of the reciprocation motion; a counterweight supported on the weight-supporting member; and a first supporting member and a second supporting member each provided on the housing for supporting the weight-supporting member to the housing, wherein the weight-supporting member has: a first connecting part and a second connecting part supported by the first supporting member and the second supporting member, respectively; and an elastically deforming part positioned between the first connecting part and the second connecting part and having a mounting part on which the counterweight is supported, the elastically deforming part including a portion having a smaller cross-sectional area than each cross-sectional area of the first connecting part and the second connecting part.