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2. Hoist (device) - Wikipedia

   en.wikipedia.org/wiki/Hoist_(device)

   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.

3. Derrick - Wikipedia

   en.wikipedia.org/wiki/Derrick

   To lift a load, a separate line runs up and over the mast with a hook on its free end, as with a crane. [ 1 ] [ 2 ] Derricks are especially useful for high-rise rigging, jobs that cover a long period of time, or jobs when the impact to street or pedestrian traffic is a concern. [ 3 ]

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5. Hoist (mining) - Wikipedia

   en.wikipedia.org/wiki/Hoist_(mining)

   A drum hoist (steel wire rope visible) and motor. In underground mining a hoist or winder [1] is used to raise and lower conveyances within the mine shaft.Modern hoists are normally powered using electric motors, historically with direct current drives utilizing Ward Leonard control machines and later solid-state converters (), however modern large hoists use alternating current drives that ...

6. Differential pulley - Wikipedia

   en.wikipedia.org/wiki/Differential_pulley

   Let's call the number of pockets in the two respective sprockets P 1 (larger) and P 2 (smaller). In lifting a load, for each full revolution of the double sprocket assembly, P 1 chain link pairs (alternate perpendicular links fit between pockets) will be taken up by the larger sprocket while P 2 chain link pairs are released by the smaller ...

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8. Overhead crane - Wikipedia

   en.wikipedia.org/wiki/Overhead_crane

   Now many hoists are package hoists, built as one unit in a single housing, generally designed for ten-year life, but the life calculation is based on an industry standard when calculating actual life. See the Hoists Manufacturers Institute site [2] for true life calculation, which is based on load and hours used. In today's modern world for the ...

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   AOL Mail welcomes Verizon customers to our safe and delightful email experience!