Terex Tower Cranes San Diego

Early Crane Evolution

The first recorded idea or type of a crane was used by the early Egyptians more than 4000 years ago. This apparatus was known as a shaduf and was used to transport water. The crane was made out of a pivoting long beam which balanced on a vertical support. On one end a bucket was attached and on the other end of the beam, a heavy weight was connected.



Cranes that 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 which was referred to as a boom. The boom was connected to a base which rotates. The treadmill or the wheel was a power-driven operation that had a drum with a rope that wrapped around it. This rope also had a hook which was connected to a pulley at the top of the boom and carried the weight.



Cranes were utilized extensively throughout the Middle Ages to build the huge cathedrals within Europe. These devices were also utilized to unload and load ships in key ports. Eventually, significant crane design advancements evolved. Like for example, a horizontal boom was added to and was called the jib. This boom addition allowed cranes to have the ability to pivot, therefore greatly increasing the range of motion for the machine. After the 16th century, each side of a rotating housing which held the boom incorporated two treadmills.



Even until the mid-19th century, cranes continued to depend on animals and humans for power. When steam engines were developed, this all quickly changed. At the turn of the century, IC or internal combustion engines and electric motors emerged. Cranes also became designed out of steel and cast iron as opposed to wood. The new designs proved longer lasting and more efficient. They could obviously run longer too with their new power sources and hence carry out larger jobs in less time.

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