US Patent 7785027 Electronic pens with dynamic features

An electronic pen includes a first and a second nib structure. A twist mechanism is coupled to the first and second nib structures to selectively extend the first or the second nib structure away from the twist mechanism in response to a rotational force. An inner cylinder is coupled to the twist mechanism, the inner cylinder having a first center axis and configured to rotate around the center axis to transfer the rotational force to the twist mechanism. An outer cylinder surrounds the inner cylinder and is coupled to the inner cylinder to move the inner cylinder in a rotational direction when the outer cylinder is rotated. The outer cylinder has a second center axis that is offset with respect to the first center axis of the inner cylinder.