crane

Crane

A crane to lift and lower materials and to move them horizontally that can be used both as a hoist, wire ropes or chains, and sheaves, a type of machine is equipped with. It mainly heavy lifting and other places used for transporting them. Creating a mechanical advantage and thus move loads beyond the normal capacity of a person to one or more uses of simple machines. Cranes for the movement of goods and the accumulation of heavy equipment in the construction industry for the manufacturing industry, for loading and unloading freight transportation industry are working.
The first construction cranes were invented by the ancient Greeks and donkeys such as men or beasts of burden, was powered by. These cranes were used for the construction of tall buildings. The large cranes to lift heavy weights, the use of human treadwheels employment, was developed. In the High Middle Ages, harbor cranes and ships free download to help with the construction of these was introduced - some extra strength and stability of the towers were built of stone. The earliest cranes were constructed from wood, but iron, iron and steel took over with the coming of the Industrial Revolution were cast.
hoists in watermills and windmills harnessed the natural power that can be driven by, for several centuries, power, men or animals were provided by physical exertion. First 'mechanical' power was provided by steam engines, the earliest steam crane used in the late 20th century in very well with the rest, 18th or 19th century, is being introduced.use the system.
According to a specific use - Cranes forms are available in a huge variety. Sometimes size used for high buildings the tallest tower cranes, to the smallest JIB cranes used inside workshops, carry. Mini cranes from reaching tight spaces also to facilitate the construction, which is used for high buildings. In the end, we usually build oil rigs and salvage sunken ships to use large floating cranes can find.
Some strictly a crane lifting machines do not fit the above definition, but in general, such as the stacker cranes and cranes loader cranes, as is known.