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A block and tackle [1] [2] or only tackle [3] is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads.. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load.
A block-setting crane is a form of crane. ... which has two cranes with a capacity of 10,000 tonnes (11,023 short tons; 9,842 long tons) each. For 50 years, ...
A crane was needed which could set larger and heavier blocks, up to 30 tons. 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 single movable pulley is supported by two parts of the same rope and has a mechanical advantage of two. Compound: A combination of fixed and movable pulleys forms a block and tackle. A block and tackle can have several pulleys mounted on the fixed and moving axles, further increasing the mechanical advantage.
In their heyday, block-setting cranes were sold on from completed sites and used elsewhere. Two cranes returned to the UK for further use; a S&P Titan of 1900 for Seaham went on to Malta and thence to the Proof Testing Establishment at Shoeburyness in 1921; and a S&P Titan of 1901 from Simonstown went to Aberdeen in 1937.
Not the first crane accident for city, or equipment owner. 08:45, AP. The crane is owned by the New York Crane & Equipment Corp., one of the city’s most widely used crane providers, officials said.
The crane spanned the entire length of at least one block when it fell to the ground in Worth Street, TriBeCa. ... It was one of two deadly crane accidents in 2008, leading to the resignation of ...
A treadwheel crane survives at Harwich, Essex, United Kingdom. It was built in 1667 and formerly stood in the Naval Yard. It was moved to Harwich Green in 1932. The crane has two treadwheels of 16 feet (4.88 m) diameter by 3 feet 10 inches (1.17 m) wide on an axle 13 + 1 ⁄ 2 inches (340 mm) diameter.
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