GANTRY CRANE

Gantry crane or Portal Crane or Goliath Crane is the type of crane in which the bridge/ girder is integral part of four legged structure. The legs are mounted on wheels assembly which runs on rails fixed on ground. The trolley/ crab of the cane is mounted on top of bridge structure.

The long travel drive assembly is mounted on the foot of the legged structure. The LT drive moves the whole crane across the length of travel.

These cranes find great use at Ports for ship loading/ unloading purpose.

A variation of Gantry crane is known as Semi-Gantry crane.
Semi-Gantry crane or Semi-Portal crane or Semi-Goliath Crane are similar to Gantry cranes but they have two legs instead of four.
Semi-Gantry crane consists of trolley/ crab which is mounted on bridge structure. The Trolley moves across the bridge. The bridge/ girder is integral part of two legged structure. The legs are mounted on wheels assembly which runs on rails fixed on ground. The other side of bridge is directly mounted on wheel assembly which moves on gantry. These cranes are frequently used in Workshops.