Patent ID: 7703330
Filing Date: 2010-04-27
Classification: B25B

Abstract:
1. A power tool comprising: a driving unit for performing screw tightening operations; a motor for rotatably driving the driving unit; a trigger switch for turning on and off the motor; and a control circuit, accommodated in a main body of the power tool, for monitoring the screw tightening operations, wherein the control circuit has a screw tightening completion detection unit for detecting completion of a screw tightening operation; a screw tightening count unit for counting the number of detected tightening operations; a screw tightening number setting unit for presetting the number of screws to be tightened; and a screw tightening completion notifying unit for notifying completion of the screw tightening operations when the number of detected tightening operations reaches the preset number of screws, wherein a rechargeable battery pack is detachably attached to the main body of the power tool; and supplying of electric power from the battery pack to the setting/display unit is cut off when a specific period of time elapses after completing the screw tightening operations, and wherein the power tool further comprises a storage unit for storing the preset number of the screw tightening number setting unit and the counted number of the screw tightening count unit.