Carrier 1 rotates about axis A of link 4 and is connected by turning pair B to gear 2. Guide 6 is connected by a turning pair to gear 2 and slides on link 4 along axis y-y. Gear 2 meshes with internal gear 3 which rotates about axis A and is rigidly attached to rope drum 5. The speeds n₁ and n₃ of carrier 1 and gear 3 (in rpm) are related by the equation n₃=n₁(z₃-z₂)/z₃ where z₂ and z₃ are the numbers of teeth of gears 2 and 3. When carrier 1 rotates, gear 2 has a circular translational motion, and gear 3 and drum 5 rotate at a much lower speed than carrier 1, winding up rope 7 to hoist the required load with a large mechanical advantage.
$2957$CxG,MH$