Heavy Equipment

Heavy Equipment by Jan Adkins ISBN-13: 9780684166414 ISBN-10: 0684166410 Publisher: Atheneum copyright 1980 Hardcover 7.9 x 8.25 inches, 32 pages Heavy equipment or heavy machinery or Earthmover refers to heavy-duty vehicles specially designed to execute construction tasks, most frequently involving earthwork operations or other large construction tasks. Heavy equipment usually comprises five equipment systems: the implement, traction, structure, power train, and control/information. Heavy equipment has been used since at least the 1st century BC when the ancient Roman engineer Vitruvius described a crane in De architectura when it was powered via human or animal labor. Heavy equipment functions through the mechanical advantage of a simple machine, the ratio between input force applied and force exerted is multiplied, making tasks which could take hundreds of people and weeks of labor without heavy equipment far less intensive in nature. Some equipment uses hydraulic drives as a primary source of motion. The word plant, in this context, has come to mean any type of industrial equipment, including mobile equipment (e.g. in the same sense as powerplant). However, plant originally meant "structure" or "establishment" – usually in the sense of factory or warehouse premises; as such, it was used in contradistinction to movable machinery, e.g. often in the phrase "plant and equipment". Detailed drawings and brief text document the shape and function of such heavy machinery as compactors, excavators, graders, crawlers, and cranes.