Worm wheel 7 rotates about fixed axis A and is rigidly attached to sheave 1 over which a flexible link runs in hoisting load G. Worm 2, meshing with worm wheel 7, is rigidly attached to cone 3, and rotates about and has axial motion along fixed axis B-B. Load G applies a clockwise torque to sheave 1 and worm wheel 7 which pushes worm 2 to the left, forcing cone 3 into conical cup 4. This applies the brake because cup 4 is held against rotation by ratchet wheel 6, integral with the cup, and pawl 5. When the load is raised, pawl 5 slides over the teeth of ratchet wheel 6.
$3383$SmF,Br$