Patent ID: 7644783

Claim:
A hand-held motor driven power tool, comprising: a motor housing, a motor disposed in the motor housing and having a motor spindle driven by the motor during use, a gear box, a gear train disposed in the gear box and including an input gear connected to the motor spindle, an output spindle for driving a tool bit, and at least a first gear reduction between the input gear and the output gear arranged so that, during use, the output spindle rotates at a higher or lower rate relative to the motor spindle, and a clutch mechanism arranged to interrupt drive between the motor to the output spindle when a torque force applied to the output spindle exceeds a predetermined threshold, a manually operable dial connected to the clutch mechanism for varying the threshold at which drive is interrupted; and wherein the clutch mechanism is bounded by the motor on a first side of the clutch mechanism, the gear train on a second side of the clutch mechanism and the dial on a third side of the clutch mechanism.