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Windlass. The windlass / ˈwɪndləs / is an apparatus for moving heavy weights. Typically, a windlass consists of a horizontal cylinder (barrel), which is rotated by the turn of a crank or belt. A winch is affixed to one or both ends, and a cable or rope is wound around the winch, pulling a weight attached to the opposite end.
Chain hoists are often inexpensive and easy to operate but do require the chain hoist to be mounted, unlike a movable hydraulic hoist. Electric chain hoist. The electric chain hoist, also known as the "electric hoist", is the least used type of engine crane. The operation is similar to the chain hoist in the way that chains are used to lift the ...
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. The most familiar form is an elevator, the car of which is raised and lowered by a hoist mechanism.
A gantry crane is a crane built atop a gantry, which is a structure used to straddle an object or workspace. They can range from enormous "full" gantry cranes, capable of lifting some of the heaviest loads in the world, to small shop cranes, used for tasks such as lifting automobile engines out of vehicles. They are also called portal cranes ...
World Heritage Sites UNESCO lists sites under ten criteria ; each entry must meet at least one of the criteria. Criteria i through vi are cultural, and vii through x are natural. * Transnational site Name Image Location Community UNESCO data Period Description Cave of Altamira and Paleolithic Cave Art of Northern Spain Santillana del Mar Cantabria, Asturias, Basque Country 310; 1985, 2008 ...
He claimed that many engineering firms conceded on the difficulty of efficiently disengaging the chain from the teeth as the pulleys turned, but his firm developed a "pitch" chain which solved the issue. Marketed as "Weston Differential Pulley Blocks with Patent Chain Guides", the pulley had good sales, namely, 3000 sets in 9 months.
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