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A block and tackle [1] [2] or only tackle [3] is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads.. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load.
A crown block is the stationary section of a block and tackle that contains ... crown block and wire rope drill line gives the ability to lift weights in the hundreds ...
In 2010 Derrick Crass invented DC Blocks; stackable and portable weightlifting blocks made in the USA from 100% recycled plastic. Derrick currently resides in Ormond Beach, Florida. In 2013 Derrick graduated from Saint Louis University as a Physician Assistant, but has retired. He has an internet business to sell and promote his invention: DC ...
In Roman Egypt, Hero of Alexandria (c. 10–70 AD) identified the pulley as one of six simple machines used to lift weights. [3] Pulleys are assembled to form a block and tackle in order to provide mechanical advantage to apply large forces.
On the top side, the two legs are connected together by a lashing but with a small spacer block placed between the legs. A sling, which may be made from ropes, is placed around the area that two legs meet to be used to put a tackle pulley system for lifting the load. There are two guy wires, front and rear, to support the shear legs.
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