When handle 1 is turned clockwise, brake band 7 is tightened and ratchet wheel 2, brake drum 3 and hoisting drum 4 rotate as a single unit about axis A, lifting load Q. Pawl 5 slides over the teeth of wheel 2, allowing it to rotate clockwise. Spring 6 provides for the initial tension of the brake band. When handle 1 is released, the brake is applied by the load and pawl 5 prevents the load from dropping.
$2764$RG,Br$