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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 ...
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.
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 ...
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.
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 ...
A crane's rated load is its Safe Working Load (SWL) and the design load (DL) is, (p 90) [1] = The dynamic lift factor for offshore cranes in the range 10 kN < SWL ≤ 2500 kN is not less than =.(p 84) [1] Thus for a crane with a SWL of 2000 kN (~200 tonne) its design load is not less than, = = The minimum breaking load (MBL) for the combined capacity of reeves of a steel wire hoisting rope ...
EN 1993-6 gives principles and application rules for the structural design of crane runaway beams and other crane supporting structures including columns and other member fabricated from steel. This part is intended to be used with Eurocode EN 1991-1 and it covers overhead crane runaways inside buildings and outdoor overhead crane runaways.