US Patent 9289885 Ratchet wrench having an end cap

A power driven tool for rotating a mechanical element includes a housing including a base and a head connected to the base. The head has a yoke formed by opposing arms separated by an opening. A selectively operable motor is positioned in the housing having an output shaft that rotates relative to the housing during operation of the motor. A ratchet mechanism is mounted in the housing and includes an output drive at least partially mounted in the opening for rotation relative to the housing to rotate the mechanical element in a selected direction. A cap is positioned on the head of the housing across the opening forming the yoke. The cap reinforces the yoke during operation of the tool to prevent the arms from separating and blocking at least part of the opening between the arms to prevent debris from entering the ratchet mechanism.