Mobile gantry crane - has adjustable span and height to allow use on tracks of varying width

摘要

A mobile gantry crane has the lower portion of the vertical columns made of tubes welded together. A second tube fits inside the central tube of the lower portion and can be adjusted for height by means of transverse bolts (12). The cross beam (6) has tubular end members which fit over the upper vertical tube and is also supported by transverse bolts (13). The cross-beam (6) has a box section beam which can slide between two channel sections so that the span of the gantry can be adjusted to suit any width of track. The height adjustment enables the crane to be used on rails of different levels.