Patent attributes
A screwdriver includes a handle and a plastic gear mechanism which drives a bit engaging device by a power source connected to the handle. A positive plate and a negative plate are respectively connected to the handle. A light frame has at least one light bulb connected thereto and a positive ring and a negative ring are respectively engaged with the light frame. A spring is mounted to the bit engaging device and connected between the negative ring and the negative plate. The at least one light bulb is connected to the positive ring and the negative ring. A gap is defined between the positive plate and an extension of the positive ring. An annular switch is rotatably mounted to the light frame and includes a touch piece which contacts both of the position plate and the extension of the positive ring to light the at least one light bulb.
