Terex Tower Cranes San Francisco

Early Crane Evolution

More than 4000 years ago, early Egyptians created the first recorded version of a crane. The original apparatus was called a shaduf and was first used to transport water. The crane was made out of a pivoting long beam which balanced on a vertical support. On one end a heavy weight was attached and on the other end of the beam, a bucket was connected.



Cranes which were made during the first century were powered by humans or by animals that were moving on a wheel or a treadmill. The crane consisted of a long wooden beam that was referred to as a boom. The boom was connected to a base that rotates. The wheel or the treadmill was a power-driven operation which had a drum with a rope that wrapped around it. This rope also had a hook which was attached to a pulley at the top of the boom and lifted the weight.



Cranes were used extensively in the Middle Ages to make the enormous cathedrals in Europe. These devices were also designed to load and unload ships in key ports. Over time, major crane design developments evolved. For example, a horizontal boom was added to and was referred to as the jib. This boom addition enabled cranes to have the ability to pivot, therefore greatly increasing the equipment's range of motion. After the 16th century, each side of a rotating housing which held the boom incorporated two treadmills.



Cranes utilized animals and humans for power until the mid-19th century. This all changes quickly once steam engines were developed. At the turn of the century, electric motors as well as IC or internal combustion engines emerged. Cranes also became designed out of steel and cast iron as opposed to wood. The new designs proved more efficient and longer lasting. They can obviously run longer as well with their new power sources and hence finish larger jobs in less time.

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