The earliest cranes were constructed from wood, but cast iron, iron and steel took over with the coming of the Industrial Revolution.įor many centuries, power was supplied by the physical exertion of men or animals, although hoists in watermills and windmills could be driven by the harnessed natural power. In the High Middle Ages, harbour cranes were introduced to load and unload ships and assist with their construction – some were built into stone towers for extra strength and stability. Larger cranes were later developed, employing the use of human treadwheels, permitting the lifting of heavier weights. These cranes were used for the construction of tall buildings. The first known construction cranes were invented by the Ancient Greeks and were powered by men or beasts of burden, such as donkeys. Cranes are commonly employed in the transport industry for the loading and unloading of freight, in the construction industry for the movement of materials, and in the manufacturing industry for the assembling of heavy equipment. The device uses one or more simple machines to create mechanical advantage and thus move loads beyond the normal capability of a human. It is mainly used for lifting heavy things and transporting them to other places.
RETROFIT KITS FOR MOST JIBS!Ībell-Howe, Bushman, Contrx, David Round, Grainger, Gorbel, Spanco, Handling Systems, Inc., McMaster-Carr & Others.Īll products are available in Stainless Steel and Made in the U.S.A.A crane is a type of machine, generally equipped with a hoist rope, wire ropes or chains, and sheaves, that can be used both to lift and lower materials and to move them horizontally. Accurately position loads by eliminating jib over travel. Our motorized wall mounted jib cranes help to relieve potential operator strain and injuries. Roto-Mate™/ Roto-Max™ reduce the risk of damage to products and machining centers with positive jib control. Ideal for over-crowded areas, David Round’s motorized wall mount jib cranes rotate with the push of a button. Custom designs and complete lifting systems including hoist and power feeds are available. They accurately position loads by rotating the boom.
Our jib cranes are often utilized in industrial applications where ergonomics and efficiency are critical. Our motorized free standing jib cranes reduce the risk of damage to products and machining centers with positive jib control. Ergonomic Benefits of our Material Handling Productsĭavid Round free standing motorized jib cranes relieve operator strain in both high capacity and high-use applications with the Roto-Mate™ and Roto-Max™ jibs.
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