A chain pulley, also known as a chain block or manual chain hoist, is a mechanical device used for lifting and lowering heavy loads using a chain. It consists of a lifting chain, a hand chain, and a system of gears and pulleys enclosed in a housing. When the hand chain is pulled, it turns the internal gears and raises or lowers the load attached to the lifting hook. Chain pulleys are commonly used in industries such as construction, manufacturing, shipping, and automotive repair. They are especially useful in environments where electricity is not available, as they are manually operated. Their simplicity, durability, and portability make them ideal for both indoor and outdoor use. One of the major advantages of chain pulleys is their mechanical advantage—a small amount of effort applied to the hand chain can lift a significantly heavier load. Depending on the model and construction, chain pulleys can handle weights ranging from a few hundred kilograms to several tons. Chain pulleys come in various types, including manual chain blocks, electric chain hoists, and lever hoists. While manual chain pulleys are most common for smaller-scale applications, electric versions offer faster and more efficient operation for larger loads or repeated lifting tasks. Safety is crucial when using a chain pulley. Operators must ensure the load is within the device's rated capacity and that the hoist is securely mounted. Regular inspection and maintenance of chains, hooks, and gears help prevent accidents.