Link 1 turns about fixed axis A and has saw-shaped teeth a which engage teeth b of link 2. Link 2 has only axial motion along axis A of fixed shaft 5. Link 6 rotates freely about axis A and is keyed to rotating disks 3. Stationary disks 4 are keyed to fixed shaft 5. When lever d of link 1 is turned clockwise (looking from the right), the action of teeth a and b pushes link 2 to the left, applying pressure between the stationary and rotating disks and braking link 6.
$3381$SmF,Br$