Patent ID: 8851201

Claim:
A power tool comprising: a housing; a motor supported in the housing; a transmission operably coupled to the motor to receive torque from the motor; an output shaft rotatable about a central axis and operably coupled to the transmission to receive torque from the transmission; a clutch mechanism coupled to the transmission and operable in a first mode, in which torque from the motor is transferred to the output shaft through the transmission, and a second mode, in which torque from the motor is diverted from the output shaft toward a portion of the transmission; a clutch mechanism adjustment assembly including a first ring rotatable about the central axis and having a cam surface spaced from the central axis in a radial direction; a second ring coaxial with the first cam ring and in facing relationship with the cam surface of the first ring; and a cam member disposed between the cam surface and the second ring; wherein the clutch mechanism includes a resilient member for at least partially imparting reciprocating motion to the clutch mechanism adjustment assembly along the central axis during operation of the clutch mechanism in the second mode, and wherein, in response to rotation of the first ring relative to the second ring, the cam member engages the cam surface to displace the second ring relative to the first ring along the central axis and compress the resilient member to increase the amount of torque transferred to the output shaft during the first mode of operation of the clutch mechanism.