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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.
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 ...
The enclosed #2 Headframe (left) and the Hoist House (right) of the Quincy Mine. Concrete headframes require less maintenance and are less susceptible to corrosion than steel headframes. There is much less waste of concrete during construction of a concrete headframe than there is of steel in construction of a steel headframe.
In contrast to modern cranes, medieval cranes and hoists — much like their counterparts in Greece and Rome [28] — were primarily capable of a vertical lift, and not used to move loads for a considerable distance horizontally as well. [25] Accordingly, lifting work was organized at the workplace in a different way than today.
The bucket is maneuvered by means of a number of ropes and chains. The hoist rope, powered by large diesel or electric motors, supports the bucket and hoist-coupler assembly from the boom. The dragrope is used to draw the bucket assembly horizontally. By skillful maneuver of the hoist and the dragropes the bucket is controlled for various ...
The crane's hook is kept level by automatically paying out enough extra cable to compensate for this. This is also a purely mechanical linkage, arranged by the reeving of the hoist cables to the jib over a number of pulleys at the crane's apex above the cab, so that luffing the jib upwards allows more free cable and lowers the hook to compensate.
A team of riggers design and install the lifting or rolling equipment needed to raise, roll, slide or lift objects such as heavy machinery, structural components, building materials, or large-scale fixtures with a crane, hoist or block and tackle. Rigging comes from rig, to set up or prepare.
It keeps the deck clear of guy ropes and preventors. Only one winchman is needed, and the Hallen can be brought into use within a few minutes. It is less expensive than a crane. A disadvantage is the low working range of the Hallen derrick; it is able to swing 75° from the centerline and can work against a list of up to 15°.
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