Motor system for dual voltage devices

A power tool comprising:

• a housing;
• an output shaft supported by the housing for rotation about an axis;
• a battery terminal selectively operable to receive a DC power supply from a battery;
• a receptacle arranged to selectively engage and disengage an AC power source external to the power tool, the receptacle operable to receive an AC power supply from the AC power source when the AC power source is engaged with the receptacle;
• a motor operable in a first power mode in response to receipt of the DC power supply to rotatably drive the output shaft and operable in a second power mode in response to receipt of the AC power supply to rotatably drive the output shaft;
• and
• a mechanical interlock movable between a first position in which the interlock inhibits a flow of the AC power supply to the receptacle and a second position in which the interlock inhibits a flow of the DC power supply to the battery terminal,
• wherein the mechanical interlock physically blocks the receptacle to prevents a mechanical and an electrical connection of the AC power source to the power tool when in the first position and physically blocks the battery terminal to prevents a mechanical and an electrical connection of the battery to the power tool when in the second position.