Extendible jib technology
In mobile tower cranes, the radius of the crane is often one of the essential factors. Spierings developed the extendible jib technology to increase the radius even further. This new development was first used on the SK1265-AT6 crane, achieving a radius of 60 meters with a 1.7-ton maximum tip load. The extendible jib delivers an extra eight metres of jib length. The jib itself becomes wider after it is extended, making the width of the extendible jib the same as that of the existing jib section. This technology has also been implemented on the SK2400-AT7 and SK2400-R models. A modified version of the extendible jib has also been used on the SK597-AT4 and SK487-AT3 cranes. With this type of crane, an extra four metres of jib length is obtained. Furthermore, the transition between the jibs is seamless due to the two carbon sections that rotate at the same time the jib is being interlocked and adopt the same dimensions as the rest of the jib. These cranes also achieve a maximum tip load of 1.7 tons.