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Derrick |
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derrick: see crane crane, hoisting machine for lifting heavy loads and transferring them from one place to another, ordinarily over distances of not more than 200 ft (60 m). Cranes have a long reach and can lift loads to great heights. ..... Click the link for more information. . derrick a simple crane having lifting tackle slung from a boom derrick [′der·ik] (mechanical engineering) A hoisting machine consisting usually of a vertical mast, a slanted boom, and associated tackle; may be operated mechanically or by hand. derrick One of a number of types of hoisting devices, equipped with tackle at their upper ends, that lift building materials at a construction site. Derrick famous hangman; eponym of modern hoisting apparatus. [Br. Hist.: Espy, 170] See : Execution Derrick a load-lifting device. It is a cantilever boom attached by a pivot at the bottom to a mast or column and suspended from a cable at its upper end, so that it can move about its vertical axis and vary its angle to the horizontal. The load is raised and lowered by a hoist. The lifting capacity of the derrick is usually less than 10 tons; that of heavy-duty types may be as high as 300 tons. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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