Patent ID: 6796921
Filing Date: 2004-09-28
Classification: B25F,F16H

Abstract:
A portable electric rotary power tool having a multiple speed transmission, the power tool comprising:a housing; an electric motor oriented within the housing, the motor having a rotary output shaft for providing a first output torque; a plurality of gear reduction elements, each having an input member to receive an input torque and an output member to provide an output torque, wherein at least one of the input members is operably connected to the rotary output shaft to receive the first output torque, and wherein at least two of the gear reduction elements have a common input member and a common output member, and the at least two gear reduction elements each have a locked mode, a reduction mode and a disengaged mode; a shift actuator in selective communication with the at least two gear reduction elements; and an output spindle operably driven by one of the output members; wherein the shift actuator has a first position wherein the at least two gear reduction elements are each in the locked mode, for providing the first output torque to the spindle, the shift actuator has a second position wherein the first of the at least two gear reduction elements is in the reduction mode and the second of the at least two gear reduction elements is in the disengaged mode for providing a second output torque to the spindle, the shift actuator has a third position wherein the first of the at least two gear reduction elements is in the disengaged mode and the second of the at least two gear reduction elements is in the reduction mode for providing a third output torque to the spindle.