Cross-shaped member 6 is keyed to shaft 1, rotates about fixed axis A and has symmetrically located guides b in which brake shoes 2, 3, 4 and 5 slide. The brake shoes are connected by springs 7 to member 6. Driven link 8 rotates about axis A. As the speed of driving shaft 1 increases, the centrifugal forces of inertia of shoes 2, 3, 4 and 5 increase and the shoes are pressed against the rim of link 8, thereby increasing the transmitted torque. When the speed of shaft 1 is reduced, the centrifugal forces of the shoes are decreased and springs 7 disengage the clutch.
$3405$SmF,C$