Crane (machine)

A tower crane with a pivoted main boom

A crane is a lifting machine that has hoists, wire ropes and sheaves on it. It can be used both to raise and lower things or to move them left and right. Cranes are often used in the construction industry (building houses or buildings) and in creating or moving heavy things.

Crane (machine) Media

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  (Portuguese): Grua mecânica (Spanish): Grúa mecanica *(English): Crawler type derrick crane. Red - Hoist ropes; Green - Auxiliary hoist ropes; Blue - boom hoist and grab ropes

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  Manual crane from the late 19th century used for unloading small loads from ships at the Port of Barcelona, Spain

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  Modern cranes used as part of the reconstruction of the Houses of Parliament, in Cape Town CBD

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  Greco-Roman Trispastos ("Three-pulley-crane"), a simple crane type (1800 N load)

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  Greco-Roman Pentaspastos ("Five-pulley-crane"), a medium-sized variant (c. 6000 N load)

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  Reconstruction of a 10.4 m high Roman Polyspastos powered by a treadwheel at Bonn, Germany

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  Roman relief from the Tomb of the Haterii showing a construction crane with a pulley system

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  Diagram of a water-raising device from Al-Jazari's Book of Knowledge of Ingenious Mechanical Devices (1206 CE)

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  Interior of a medieval treadwheel crane in Bruges, Belgium, showing the wooden wheel mechanism powered by human walking

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  Double treadwheel crane in Pieter Bruegel's The Tower of Babel

• A tower crane can swing its boom left and right, dolly its car, and lift and lower its load

• A tower crane rotates on its axis before lowering the lifting hook.

Other websites

• Knots, hitches and bends Archived 2007-01-07 at the Wayback Machine
• VRML Simulation of an Excavator, Tower Crane, and Dumptruck Archived 2007-12-14 at the Wayback Machine