Patent ID: 7878265
Filing Date: 2011-02-01
Classification: B25D

Abstract:
1. An impact power tool comprising: a tool body, a hammer actuating member that is disposed in a tip end region of the tool body and performs a predetermined hammering operation on a workpiece by reciprocating in its axial direction, a striker that performs a striking movement on the hammer actuating member by reciprocating in the longitudinal direction of the tool body, a weight configured such that a first portion of a reaction force is transmitted from the hammer actuating member to the weight either by: a first elastic element configured such that a second portion of the reaction force is transmitted from the hammer actuating member to the first elastic member either by: a second elastic element that elastically deforms when the weight is caused to move rearward from the reaction force transmitting position by the reaction force transmitted to the weight and pushes the second elastic element, thereby absorbing the reaction force, wherein the mass of the weight is set to about 40% or more of the mass of the striker, and the first portion of the reaction force is greater than the second portion of the reaction force.