Various KInds of Crawler-Mounted Cranes
In order to be able to power a large variety of machines, industrial wheel tractors were adapted during the 1920s, by McCormick-Deering and Fordson. For instance, half-swing shovels and cranes were made by several companies around the power train and engine of the tractor and the wheels became replaced by crawlers.
Crawler tractors came into widespread use throughout the 1930s. Immediately after, numerous manufacturers began manufacturing attachments for them, including various lifting equipment devices.
Side-mounted booms for example, were used mainly for pipe-laying at first and the machinery got the nickname "pipelayer." These machinery are now normally utilized for attending to cleaning up railroad derailments. Due to their mobility, size and compact design, along with outstanding lifting capacity, these equipments are great for this use. As well, swing booms that mounted on top of the engine compartment also became available.
Crawler cranes are like the crawler tractor in that it travels along crawler tracks. These equipments can not move fast thanks to their intense weights. Usually, the crane is powered by one engine and can be controlled by 2 or more cable operated drums. The crawler cranes come outfitted with a lattice boom or a telescopic arm which is easy to extend by utilizing hydraulics. The lattice boom has to be manually assembled by adding many sections.
Tower Cranes
Typically found in large construction projects, tower cranes are required to be built and broken down on location. They must be transported by truck each time they are relocated. These tower cranes are exceptionally tall. They enable construction crews to transport heavy steel or concrete building parts to the tops of tall buildings. Tower cranes use a hydraulic system to push every new crane part up into position and thus, are self-erecting.