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For instance, a 1-ton differential chain fall might have a 15-pocket and a 14-pocket sprocket set. This would provide a total of 2 X 15/(15-14), or 30:1 mechanical advantage. See also
The speed of the bucket chain is 1.22 m/s with a digging force of 1,170 kN/m 2. [4] BCEs such as the RK 5000 from the Czech Republic weigh up to 5,000 tons. [ 5 ] The largest BCE model currently known is the Takraf Type Es 3750 , with a length of over 130 meters, a height of around 40 meters and a weight of 5,118 t (11,300,000 lb) [ 6 ]
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.
An example of this would be a chain that has a MBL of 2000 lbf (8.89 kN) would have a SWL or WLL of 400 lbf (1.78 kN) if a safety factor of 5 (5:1, 5 to 1, or 1/5) is used. The current American standard for lifting and handling devices is Reference (1), which provides minimum structural and mechanical design and electrical component selection ...
The Tenryū class was designed to act as flagships for destroyer flotillas. The design represented an intermediate class between the light cruiser (e.g.Chikuma class of 5,000 t) and the destroyer (e.g. Kawakaze-class destroyers of 1,300 t), which had few counterparts in other navies of the time, although it was inspired by a similar concept to the Royal Navy Arethusa class and C-class cruisers ...
A block is a set of pulleys or sheaves mounted on a single frame. An assembly of blocks with a rope threaded through the pulleys is called tackle. The process of threading ropes or cables through blocks is called " reeving ", and a threaded block and tackle is said to have been "rove". [7] A block and tackle system amplifies the tension force ...
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