News Category

Pulley History

Views : 105
Update time : 2018-02-08 11:24:29

Pictorials on pulleys first appeared in an Assyrian relief from the eighth century BC. This relief shows a very simple pulley, which can only change the direction of force, the main purpose is to facilitate the application of force, and will not give any mechanical interest. In China, the pulley device
pulley

The painting first appeared in the Han Dynasty portrait brick, Tao Jingmo. There is also an account of the pulleys in the Book of Mohism.
Ancient Greeks categorized pulleys as simple machines. As early as 400 BC, the ancient Greeks knew how to use the compound pulley. About 330 BC, Aristotle wrote his eighteenth question in the book "Mechanical Problems," devoted to "double pulley" systems. Archimedes contributed a great deal about simple mechanics Knowledge, explaining in detail of kinematics of pulleys. It is said that Archimedes once used the compound pulley alone to pull a large ship full of cargo and passengers. In the first century AD, Alexander of Alexandria analyzed and wrote about compound pulley, which proved that load and force Is equal to the number of rope segments that carry the load, the "pulley principle."

 

America del sur co.,limited
Contact us: joe@amsei-china.com  davy@amsei-china.com  zoey@amsei-china.com