Crane (machine)

File:TowerCrane.jpg

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

• Crane machine slewing platform.svg

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

• 3U2A6305.jpg

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

• Trispastos scheme.svg

  Greco-Roman Trispastos ("Three-pulley-crane"), a simple crane type (150 kg load)

• Pentaspastos scheme.svg

  Greco-Roman Pentaspastos ("Five-pulley-crane"), a medium-sized variant (c. 450 kg load)

• Roemerkran.jpg

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

• Pl gdansk zuraw dlugiepobrzeze2006.jpg

  Medieval (15th century) port crane for mounting masts and lifting cargo in Gdańsk

• Tretkran (Bruegel).jpg

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

• Reconstruction of the temple of Jerusalem.jpg

  Single treadwheel crane working from top of the building

• Trier Germany Alter Krahnen.jpg

  Tower crane at the inland harbour of Trier from 1413

• 1742 build crane, used for mounting masts to large sailing vessels. Copenhagen, Denmark, Mastekranen, Holmen. Copenhagen, Denmark.JPG

  A crane constructed in 1742, used for mounting masts to large sailing vessels. Copenhagen, Denmark

• El movimiento de una grua.ogg

  A tower crane can "swing" its boom left and right, "dolly" its car (or traveler) in and out, and lift and lower its load

• Rotating tower crane.ogv

  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