Patent ID: 8689901
Filing Date: 2014-04-08
Classification: B25F,H02P

Abstract:
1. An electric power tool receiving an input power from an electric power source and converting the input power to a driving power to drive an electric motor, the electric power tool further comprising: a manual control mechanism which includes a trigger portion movable by depressing by a user and a magnetic element mechanically movable with the trigger portion, the trigger portion including a depressible element to receive an external depressing force and a movable element housing the magnetic element, the depressible element including a pressing surface corresponding to and in contact with the movable element; a magnetic control element to output an output control signal in proportion to alterations of a magnetic field caused by movement of the magnetic element; and a power modulation circuit which obtains the input power and modulates the input power into the driving power to drive the electric motor; the modulated driving power being controlled by the output control signal; wherein the electric power tool includes a housing which has a movement track to hold the movable element and to allow the movable element together with the housed magnetic element to move along the movement track when the movable element is pressed by the pressing surface of the depressible element, and wherein the depressible element is movably coupled on the housing.