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A jib or jib arm is the horizontal or near-horizontal beam used in many types of crane to support the load clear of the main support. [1] [2] An archaic spelling is gib. [3] Usually jib arms are attached to a vertical mast or tower or sometimes to an inclined boom.
In the mid-1880s, a further development of the crane design took place, the Hercules crane. A crane was needed which could set larger and heavier blocks, up to 30 tons. The Hercules design combined aspects of the Manora and the Port Alfred cranes. A horizontal jib was used, with the ability to slew sideways.
Stothert & Pitt crane with Toplis gear. An early form of level-luffing gear was the "Toplis" design, invented by a Stothert & Pitt engineer in 1914. [2] [3] The crane jibs luffs as for a conventional crane, with the end of the jib rising and falling. The crane's hook is kept level by automatically paying out enough extra cable to compensate for ...
The Hercules design combined aspects of both the earlier fixed-jib gantry cranes built for works at Manora and that would later be used for a slewing jib crane at Port Alfred. A horizontal jib was added, with the ability to slew sideways. A horizontal non-luffing jib [i] was used, separate from the lower frame. This was supported on two ...
In 2007, Tishman Construction Corporation of New York completed a row of steel columns at the perimeter of the construction site. Two tower crane bases were erected, each base containing a functioning luffing-jib tower crane. By the end of 2007, the tower's footings and foundations were nearly complete. [10]
The "hammerhead", or giant cantilever, crane is a fixed-jib crane consisting of a steel-braced tower on which revolves a large, horizontal, double cantilever; the forward part of this cantilever or jib carries the lifting trolley, the jib is extended backwards in order to form a support for the machinery and counterbalancing weight. In addition ...
Working the grab requires extra cables from the crane jib, so requires a specialised design of crane throughout, not merely an attachment. Some grabs use 2 cables for lift and control, others use 4. In 1927, Stothert & Pitt of Bath, Somerset produced the first specialised bulk-handling crane. [1] This was to unload coal at Barking power station ...
Pit-Cast Jib Crane Last US pit-cast jib crane to operate in the casting of iron pipe. 1905 Birmingham: Alabama United States ASME brochure: 24: 1977 State Line Generating Unit 1. World's largest electric-power generator for nearly 25 years, achieving many design firsts. 1929 Hammond: Indiana United States ASME brochure: 25: 1977 Pratt Institute ...