The brake has rigid shoe 3 which turns about fixed axis A. One end of band 2 is pivoted to shoe 3 at point B. The other end is pivoted at point C to lever 1. Band 2 has flexible lining 4. When lever 1 is turned clockwise, band 2 is tensioned and shoe 3 and lining 4 are pressed against the brake drum.
$1978$FL,Br$