Lever 1, turning about fixed axis D, is connected by turning pairs A and B to levers 2. In rotation of lever 1, levers 2 with weights are turned outward by centrifugal force about pins A and B, pressing shoes 6 to fixed cylinder 3 by overcoming the resistance of springs 4. This produces the braking effect. Screws 5 serve to adjust the tension of springs 4.
$440$SL,G$