Hand crank gear assembly, for operating a roller shutter winding shaft that is otherwise electrically operated, with - a drive shaft, - an output shaft - a gear ratio and - a clutch, which is designed to operationally connect the drive shaft with the output shaft characterized in that the output shaft, when the drive shaft is idle, is decoupled from the drive shaft and is freely rotatable in at least one direction of rotation, preferably in both directions of rotation, the clutch comprises the following components: - a first driver rotating with the drive shaft, - a second driver, which is designed to transmit its own rotational movement to the output shaft and - a coupling part located between the two drivers, at least the first driver and the coupling part are coaxially aligned along a common axis of rotation, preferably the axis of rotation of the drive shaft or the output shaft, and have opposing and touching functional surfaces (12/10), which enable rotational force transmission/torque from the first driver to the coupling part and a translation of the coupling part between the two drivers (11,21), the coupling part is slidably mounted along the common axis of rotation between the first and second drivers and is designed, in the state coupled with the second driver, to transmit a rotation of the first driver to the second driver and thus to the output shaft. characterized in that the first driver, the coupling part, and the second driver are sleeveshaped and rotatably arranged on a cylinder connector and that for improved translation of the rotation of the first driver into a translation of the coupling part, the coupling part has rotational damping on the cylinder connector, which limits free rotation of the coupling part by friction and by the friction not only rotates with the first driver but also provides the relative displacement along the axis of rotation of the two parts (7-10, 11). - a drive shaft, - an output shaft - a gear ratio and - a clutch, which is designed to operationally connect the drive shaft with the output shaft the output shaft, when the drive shaft is idle, is decoupled from the drive shaft and is freely rotatable in at least one direction of rotation, preferably in both directions of rotation, the clutch comprises the following components: - a first driver rotating with the drive shaft, - a second driver, which is designed to transmit its own rotational movement to the output shaft and - a coupling part located between the two drivers, - a first driver rotating with the drive shaft, - a second driver, which is designed to transmit its own rotational movement to the output shaft and - a coupling part located between the two drivers, at least the first driver and the coupling part are coaxially aligned along a common axis of rotation, preferably the axis of rotation of the drive shaft or the output shaft, and have opposing and touching functional surfaces (12/10), which enable rotational force transmission/torque from the first driver to the coupling part and a translation of the coupling part between the two drivers (11,21), the coupling part is slidably mounted along the common axis of rotation between the first and second drivers and is designed, in the state coupled with the second driver, to transmit a rotation of the first driver to the second driver and thus to the output shaft. characterized in that the first driver, the coupling part, and the second driver are sleeveshaped and rotatably arranged on a cylinder connector and that for improved translation of the rotation of the first driver into a translation of the coupling part, the coupling part has rotational damping on the cylinder connector, which limits free rotation of the coupling part by friction and by the friction not only rotates with the first driver but also provides the relative displacement along the axis of rotation of the two parts (7-10, 11).