Carrier 1 rotates about fixed axis A and is connected by turning pair B to gear 5 which meshes with internal gear 2. Guide 6 is connected by a turning pair to gear 5 and slides on member 7. Chain sheave 3, the driving member over which the hand chain runs, is keyed to the carrier shaft. Hoisting chain sheave 4, the driven member, is rigidly attached to (or integral with) internal gear 2. The load being hoisted applies a constant torque to sheave 4 which is overcome by the torque applied to hand chain sheave 3.The load is hoisted with a large mechanical advantage.
$2951$CxG,MH$