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This leads to a mechanical advantage: the force needed to lift a load is only a fraction of the load's weight. At the same time, the distance the load is lifted is smaller than the length of chain pulled by the same factor. This factor (the mechanical advantage MA) depends on the relative difference of the radii r and R of the connected pulleys:
An engine crane (also referred as engine hoist [1]) is a common repair tool used in vehicle repair shops to remove or install gasoline or diesel engines in small and crowded vehicle engine compartments. It uses a heavy cantilevered support structure to hold the engine in mid-air so that the mechanic can carefully connect or disconnect fragile ...
Pulley in oil derrick A hoist using the compound pulley system yielding an advantage of 4. The single fixed pulley is installed on the hoist. The two movable pulleys (joined) are attached to the hook. One end of the rope is attached to the crane frame, another to the winch.
Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
Power was transmitted to the crane from a pulley driven by a stationary engine through an endless cotton rope. [3] 1887: The Ludwig Stuckenholz company introduces electrical components to overhead cranes, determining industry design. 1910: The first mass-produced electric motor hoist starts in Germany. Configurations:
The simplest way to carry out bogie exchange is to lift the wagons off the bogies and replace them back on new bogies. This may require the wagons in a train to be uncoupled, and continuous brakes disconnected. If the wagons are swung out of the way by an overhead hoist, they may sway, which wastes time settling them down.
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To protect the hoist(s) and winches and the sensitive electronics which are used to control their operation they are normally installed inside a build called a hoist (or winder) house. Commissioning Sinking Set-Up. The Sinking set-up must then be commissioned to ensure that all parts are operating as planned. Full Sink. The activities of the ...
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