The crane is a machine for lifting and moving materials and goods, with narrow and confined movements, both outdoors and indoors. Not to be confused with the portal crane that runs on two rails several meters down the bridge, thanks to four arms.
The name itself returns the idea of the elementary composition of the machine: a winch installed on a carriage or hoist, and a bridge made up of a beam, which can be of different shapes and sizes, from the simplest ones made up of a saddle (IPE, HEA, ...) to the classic skirting beams consisting of two upper and lower plates respectively upper and lower flat and two lateral anthers, they run through two or four heads, bolted to the beams on two rails At the same height.
Typical movements are the longitudinal section of the bridge, the transverse trolley, the lifting and lowering of the load carried out by the winch / hoist.
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