Patent 7431136 was granted and assigned to Bosch on October, 2008 by the United States Patent and Trademark Office.
A hand power tool has a clutch, a motor, a drive shaft located at a side of the motor, a driven shaft to be located at a side of a workpiece, a clutch which couples the drive shaft and the driven shaft and enters into engagement when pressure is exerted on the driven shaft, and the clutch is provided with a clutch engagement aid.