Patent ID: 6676557
Filing Date: 2004-01-13
Classification: B23Q,B25B,B25F,F16H

Abstract:
A power tool comprising:a motor having an output shaft; a transmission having a first portion with a first gear ratio and a second portion having an output gear ratio, the first portion including a planetary gear assembly with a ring gear, a sun gear and a planet gear assembly, the ring gear not being shared with the second portion of the transmission, the planet gear assembly having a planet carrier and a plurality of planet gears, the planet carrier having a plurality of pins for rotatably supporting the plurality of planet gears and an output sun gear, the plurality of planet gears meshingly engaged with the sun gear and the ring gear, the sun gear coupled to the output shaft and receiving a torque input from the motor, the output sun gear meshingly engaged with the second portion and outputting an intermediate torque output, the second portion receiving the intermediate torque output and producing an output torque; and a clutch assembly for limiting a torque output of the power tool, the clutch assembly having an annular rotatable clutch member and an engagement assembly, the clutch member coupled to the ring gear, the clutch member having a predetermined clutch profile and the engagement assembly having a follower member, the follower member abutting the clutch member and cooperating with the clutch profile to inhibit rotation of the clutch member relative to the follower member only when the magnitude of the intermediate torque output is less than a predetermined maximum torque.