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Two guy derricks at a granite quarry. A derrick is a lifting device composed at minimum of one guyed mast, as in a gin pole, which may be articulated over a load by adjusting its guys. Most derricks have at least two components, either a guyed mast or self-supporting tower, and a boom hinged at its base to provide articulation, as in a stiffleg ...
Chesapeake 1000 (formerly Sun 800) is a heavy lift sheerleg crane ship, owned by Donjon Marine Co., capable of lifting 1,000 short tons (890 long tons; 910 t). [1] [2] It is one of the largest boomable stiff-leg-derrick barges on the eastern seaboard of the United States.
It manufacturers lattice boom crawler cranes with capacities ranging from 50 to 275 tons. The American Crane Corporation was founded in 1882 as the Franklin Manufacturing Company, and in 1892 the name changed to American Hoist & Derrick. The company manufacturers terrain cranes, crawler cranes and tower cranes.
The lower end is braced or set in a shallow hole and positioned so the upper end lies above the object to be lifted. The pole (also known as a mast, boom, or spar) is secured with three or more guys. These are manipulated to move the load laterally, [1] with up and down controlled by the pulley or block. In tower construction, a gin pole can ...
A tower crane is usually assembled by a telescopic jib (mobile) crane of greater reach (also see "self-erecting crane" below) and in the case of tower cranes that have risen while constructing very tall skyscrapers, a smaller crane (or derrick) will often be lifted to the roof of the completed tower to dismantle the tower crane afterwards ...
April 9, 1965: The 190-foot tall Sky Hook and merry-go-round (carousel) rides at the new 6-acre oil boom town section of Six Flags Over Texas, new for the season ... as viewed from the oil derrick ...
The YSD-11 Class had a length of 104 feet; a beam of 31 feet and 2 inches; a draft of 4 feet. They had a top speed 10 knots, built with a steel hull. The ship had one American Hoist & Derrick model 685 rotating crane. The crane had a boom of 54 feet with a lifting capacity of 10 tons. The crane was powered by a 6-cylinder Cummins Diesel engine ...
The company was one of the world’s largest crane dealers, both in units sold and in its rental fleet that included crawler cranes, rough terrain cranes, hydraulic truck cranes, derricks, and lattice boom cranes. The fleet ranged in sizes up to 450 short tons (410 t).