Shaft 1 rotates about fixed axis A and is connected by screw pair D to cone 2. Internal cone 4 rotates about fixed axis B and has annular groove a containing balls 3. When shaft 1 begins to rotate at a higher speed than cone 4, cone 2 is moved along the thread of shaft 1 to the right, jamming balls 3 between cones 2 and 4. As a result, cone 4 begins to rotate at the same speed as shaft 1. If cone 4 rotates faster than shaft 1, the cones spread apart, releasing balls 3 and disengaging the clutch.
$3412$SmF,C$