Patent ID: 7383895

Claim:
An impact power tool comprising: a tool body, a hammer actuating member disposed in a tip end region of the tool body to perform a predetermined hammering operation on a workpiece by reciprocating movement in an axial direction of the hammer actuating member, an air spring, a driving mechanism that linearly drives the hammer actuating member by means of the air spring, a weight located in a reaction force transmitting position, the reaction force transmitting position being defined by a state in which the weight is placed in direct contact with the hammer actuating member or the weight is placed in contact with the hammer actuating member via direct contact with an intervening member made of hard metal, wherein a reaction force that the hammer actuating member receives from the workpiece when performing a hammering operation is transmitted from the hammer actuating member to the weight, when the weight is located in the reaction force transmitting position, an elastic element that is elastically deformed when the reaction force transmitted to the weight causes the weight to move rearward from the reaction force transmitting position and directly contact the elastic element, wherein the elastic element absorbs the reaction force and a control member that prevents an elastic force of the elastic element from displacing the weight forward beyond the reaction force transmitting position.