Hoist
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A hoist is a suspended machinery unit that is used for lifting or lowering a freely suspended (unguided) load. It may be manually operated, electrically operated or pneumatically driven and may use chain or wire rope as its lifting medium.[1]
History
While devices for lifting and transporting objects have been used for thousands of years, the invention of the hoist is commonly credited to the Greek inventor Archimedes. Archimedes developed a pulley system in the 3rd century BCE that was used for lifting ships out of the sea. Archimedes' pulley used a block and tackle system - a system still in use today. This pulley system was the precursor to the modern chain hoist.[2]
