A chain pulley block, also known as a hand chain hoist, is a mechanical device used to lift and move heavy loads. It consists of a metal block or housing containing one or more sheaves or pulleys, around which a chain is threaded. The chain is attached to a hook or other lifting attachment, which is used to hold and move the load.
A chain pulley block works by using the mechanical advantage of a pulley system to lift and move heavy loads. The chain is threaded around the pulleys, which are designed to reduce friction and allow the chain to move more easily. By pulling on the hand chain, the operator can lift the load one link at a time, using the pulleys to multiply the force applied to the chain.
Chain pulley blocks are commonly used in a variety of industrial and construction settings for lifting and moving heavy objects such as machinery, equipment, and building materials. They are also used in manufacturing, transportation, and maintenance operations.