Patent ID: 7220211
Filing Date: 2007-05-22
Classification: B23Q,B25B,B25F,F16H

Abstract:
1. A portable power tool comprising: a housing; a motor; a driven member; a transmission at least partially received in the housing, the transmission receiving torque from the motor and outputting torque to drive the driven member, the transmission including a plurality of planetary gear sets and being selectively operated in at least three overall speed reduction ratios, at least three of the planetary gear sets transmitting torque between the motor and the driven member in each of the at least three overall speed reduction ratios, wherein at least two of the plurality of planetary gear sets are operable in an active mode for performing a speed reduction and torque multiplication operation and in at least one of the at least three overall speed reduction ratios; and a speed selector having only one switch member and an actuator, the only one switch member forming a portion of an exterior of the portable power tool and being slidably movable between a first position, a second position and a third position, the actuator coupling the only one switch member and the transmission, the actuator being movable in response to movement of the only one switch member to cause the transmission to operate in a speed reduction ratio corresponding to a position in which the only one switch member is disposed.