Link 1 turns about fixed axis and has saw-shaped teeth a which engage teeth b of cone 2. Cone 2 has only axial motion along axis A-A of fixed shaft 6. Cone 3 is rigidly secured to shaft 6. Drum 5 rotates freely about axis A-A. When lever d of link 1 is turned clockwise (looking from the right), the action of teeth a and b pushes cone 2 to the left toward cone 3, expanding split bushing 4. This presses bushing 4 against the bore of drum 5 and brakes the drum.
$3382$SmF,Br$