Power tools

A power tool adapted to tighten a fastener, comprising;

• a motor,
• means for generating an elevated torque coupled to the motor,
• a trigger switch for energizing the motor,
• a sensor detecting when the means for generating an elevated torque has begun to operate and generate the elevated torque and
• a microprocessor in communication with the sensor, the trigger switch and the motor, wherein the microprocessor controls the motor according to either (1) a measurement mode, in which the microprocessor drives the motor while the trigger switch is held in the ON position and counts a number of impacts detected by the sensor from when the trigger switch is switched to the ON position to when the trigger switch is switched to the OFF position or (2) an automatic stop mode, in which the microprocessor drives the motor upon the trigger switch is switched to the ON position, and the microprocessor stops the motor when the number of impacts detected by the sensor has reached a preset number.

A power tool adapted to tighten a fastener, comprising;

• a motor,
• means for generating an elevated torque coupled to the motor,
• a trigger switch for energizing the motor,
• a sensor detecting when the means for generating an elevated torque has begun to operate and generate the elevated torque,
• a control device in communication with the sensor, the trigger switch and the motor, wherein the control device drives the motor while the trigger switch is held in the ON position and measures a time period from when a first impacts is detected by the sensor to when the trigger switch is switched to the OFF position and
• a means for indicating the time period measured by the control device, the indicating means being connected to the control device, wherein the control device actuates the indicating means when the trigger switch is switched from the ON position to the OFF position.