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| Crane, Cranes, Hoist, Hoists |
A crane, can also be known as a overhead crane or bridge crane
too. Crane is used for lifting. Crane is generally equipped with a wire rope
drum, wire ropes or chains and sheaves, that can be used for lift and lower
materials and to move them horizontally. Crane uses hoist to create mechanical
advantage and thus move loads.
CRANE IN PAST
The first construction cranes were invented by the Ancient
Greeks and were powered by human or animals, such as donkey or hourse. Larger
cranes were developed after many years, using man treadwheels, permitting the
lifting of heavier weights. In the High Middle Ages, harbour cranes were
introduced to load and unload ships and assist with their construction – some
were built into stone towers for extra strength and stability. In the past,
cranes were made from tree wood, but cast iron and steel took over with the
Industrial Revolution.
Cranes exist in an enormous variety of forms – each tailored to
a specific use. Sizes range from the smallest jib cranes, used inside
workshops, to the tallest tower cranes, used for constructing high buildings.
For a while, mini - cranes are also used for constructing high buildings, in
order to facilitate constructions by reaching tight spaces. Finally, we can
find larger floating cranes, generally used to build oil rigs and salvage
sunken ships.
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