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[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 other jib-less designs such as derricks, the load is hung directly from a boom which is often anomalously called a jib. A camera jib or jib arm in cinematography is a small crane that holds nothing but the ...
A level-luffing crane is a crane mechanism where the hook remains at the same level while luffing: moving the jib up and down, so as to move the hook inwards and outwards relative to the base. [ 1 ] Usually the description is only applied to those with a luffing jib that have some additional mechanism applied to keep the hook level when luffing.
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 ...
In July 2013, RHB Research reported that 85% of Favelle Favco's 2013 year-to-date crane orders were offshore cranes. [ 11 ] The company also specializes in tower cranes that can lift heavy loads quickly, [ 7 ] with the Favelle Favco M760's top lift speed at 160 metres (520 ft) per minute. [ 12 ]
Animation of main and jib boom articulation. Titan is a large self-propelled crane vessel with the tip of its main boom standing at 374 feet (114 m) above the typical water line and a lifting capacity of 385 short tons (349 t). [3] In 1957, it was claimed to be the largest floating crane in operation. [7]
The operator's cabin hosts a display showing the tower crane's position, movement and operating area. Where the tower crane’s operating area overlaps with other cranes or prohibited zones these are also displayed. The system alerts the operator when the crane is approaching a prohibited area or another crane. [9]
[1] The first of these cranes were a batch of six built for the Admiralty at Keyham and Devonport. These were hand-operated and could lift 12 tons to a height of 30 feet (9.1 m) and a radius of 32 feet (9.8 m) . [1] The size of the crane jibs was determined by ships of the period, and their lifting capacity by men's ability to raise the load.
It was a luffing-jib tower crane manufactured by Favco that was 200 feet (61 m) tall at the time of the collapse. The accident occurred when workers were attaching a new steel collar to anchor it to the building at the 18th floor, as part of an operation to extend the crane upwards. [ 6 ]