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| - The earliest machines were steam powered and were the first mechanical excavators used by man, in the 1800s. The steam shovel was invented by William S Otis in 1835, and ran on rails with a boom that rotated on a king post like a crane.They made possible projects like the Panama Canal, and large dams. [1] The dragline was invented in 1904 by John W. Page of Page Schnable Contracting for use digging the Chicago Canal. In 1912 it became the Page Engineering Company, and a walking mechanism was developed a few years later, providing draglines with mobility. Page also invented the arched dragline bucket, a design still commonly used today by draglines from many other manufacturers, and in the 1960s pioneered an archless bucket design.
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| abstract
| - The earliest machines were steam powered and were the first mechanical excavators used by man, in the 1800s. The steam shovel was invented by William S Otis in 1835, and ran on rails with a boom that rotated on a king post like a crane.They made possible projects like the Panama Canal, and large dams. [1] The dragline was invented in 1904 by John W. Page of Page Schnable Contracting for use digging the Chicago Canal. In 1912 it became the Page Engineering Company, and a walking mechanism was developed a few years later, providing draglines with mobility. Page also invented the arched dragline bucket, a design still commonly used today by draglines from many other manufacturers, and in the 1960s pioneered an archless bucket design. In 1910 Bucyrus entered the dragline market with the purchase of manufacturing rights for the Heyworth-Newman dragline excavator. Their "Class 14" dragline was introduced in 1911 as the first crawler mounted dragline. In 1912 Bucyrus helped pioneer the use of electricity as a power source for large stripping shovels and draglines used in mining. In 1914 Harnischfeger Corporation, (established as PH Mining in 1884 by Alonzo Pawling and Henry Harnischfeger), introduced the world’s first gasoline engine-powered dragline. An Italian company, Fiorentini, produced dragline excavators from 1919 licensed by Bucyrus. In 1939 the Marion Steam Shovel Dredge Company (established in 1880) built its first walking dragline. The company changed its name to the Marion Power Shovel Company in 1946 and was acquired by Bucyrus in 1997. In 1988 Page was acquired by the Harnischfeger Co., makers of the PH line of shovels, draglines, and cranes. In civil engineering the smaller types are used for road and port construction. The larger types are used in strip-mining operations to move overburden above coal, and for tar-sand mining. Draglines are amongst the largest mobile equipment (not water-borne), and weigh in the vicinity of 2000 metric tonnes, though specimens weighing up to 13,000 metric tonnes have also been constructed. The largest machines do not have tracks but sit on a large base called a Tub, and have large Feet on Excentric cranks to "WALK" on, hence the term walking dragline. At one time it was thought that Hydraulic Mining Excavators would make them redundant, due to high costs. But the world demand for minerals and coal as well as oil from Tar Sands has lead to a renewed interest in them. In the UK previously redundant machines were scraped, But recently 2 machines that have finished working for UK Coal (formerly British Coal Open Cast Division) have been sold and will be striped down and shipped abroad.
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