Power tool and control method

A power tool, comprising:

• a striker which is guidable along an axis parallel to an impact direction;
• a first pneumatic chamber defined between an exciter piston and an impacting piston, wherein the impacting piston is contactable on the striker;
• a second pneumatic chamber with a volume that is variable with a movement of the striker along the axis;
• a valve device associated with the second pneumatic chamber that is actuatable depending upon a movement of the striker;
• wherein the valve device is actuatable to open upon a movement of the striker in the impact direction and is actuatable to throttle or close upon a movement of the striker against the impact direction;
• and
• a third pneumatic chamber with a volume that is variable with a movement of the striker along the axis, wherein the volume of the third pneumatic chamber is decreasable upon the movement of the striker in the impact direction;
• wherein the valve device connects the third pneumatic chamber with the second pneumatic chamber.

A power tool, comprising:

• a striker which is guidable along an axis parallel to an impact direction;
• a first pneumatic chamber defined between an exciter piston and an impacting piston, wherein the impacting piston is contactable on the striker;
• a second pneumatic chamber with a volume that is variable with a movement of the striker along the axis;
• a valve device associated with the second pneumatic chamber that is actuatable depending upon a movement of the striker;
• wherein the valve device is actuatable to open upon a movement of the striker in the impact direction and is actuatable to throttle or close upon a movement of the striker against the impact direction;
• and
• a throttle opening associated with the second pneumatic chamber wherein an effective cross-sectional area of the second pneumatic chamber is greater than a hundred times a cross-sectional area of the throttle opening.