Patent ID: 7823486

Claim:
A cordless motor assisted torque wrench comprising: an elongated housing adapted to enclose an elongated battery pack; a drive head pivotably connected to a first end of the elongated housing at a pivot connection; a ratchet drive located within the head; an electronic torque setting component operable to receive a desired torque setting from a user; an electronic torque sensing device for sensing a level of torque applied by the wrench to a workpiece; a motor disposed within the head, the motor powered by the enclosed battery pack; and an electronic torque limiter configured to limit the torque applied by the wrench to the workpiece based on the desired torque setting received at the torque setting component and the level of torque sensed by the torque sensing device; a processing device in signal communication with the torque setting component, the torque sensing device, and the motor to receive a desired torque level from the torque setting component, process signals received from the torque sensing device, and control the motor based on the desired torque level and the processed signals from the torque sensing device, wherein the head includes a locking mechanism to allow the motor to turn while the housing remains stationary to apply a first torque to a workpiece when the locking mechanism is disengaged and to allow a user to manually operate the torque wrench to apply a second greater torque to the workpiece when the locking mechanism is engaged, and wherein the locking mechanism includes a solenoid that engages and disengages a ball from a locking gear, and wherein the processing device is also in signal communication with the solenoid.