Brake shoe , including the semicircular frame ( 4 ) , the friction plate ( 1 ) , inner frame ( 5 ) , to connect the left semicircle skeleton ( 4 ) of the spring (3 ) , characterized in that: semicircular frame ( 4 ) across the bent inward to form a tab ( 6 ) , inner frame ( 5 ) and the semi-circular frame ( 4 ) inside the coupling , the skeleton liner ( 5 ) of the two ends of the card system in semi skeleton ( 4 ) ends of the tabs ( 6 ) inside .