A chain hoist is a part of a block and tackle system that has multiple chains running through it. It creates mechanical advantage by using artificial leverage to lift heavy objects with little effort.
A chain hoist is the name of the portion of a block and hoist around which the chain wraps. By itself, it doesn’t actually do anything, but when combined with the whole system, it’s part of a complex and useful device. By definition, a chain hoist has more than one chain running through it, and all links are connected to a single axle. Besides that, the block can have a wide variety of shapes, sizes and configurations. When the tackle has no lines running through it then it is just a block, but when it is strung on a line, the whole system is called a tackle.
The essential construction of a chain hoist is very simple. A single axle will have multiple rollers attached to it. It doesn’t matter how many rolls, as long as there are more than one. Beyond that, the block can be made from any material, be any size, and work with many or a few other blocks. The appearance of the block and the rest of the system is not important.
Each roller in a chain hoist is designed to have a single chain on it. Generally, these reels have one of two aspects. Some appear as wheels with a concave groove along the edge where the chain sits. The most common modern roller is a combined set of rollers which are all enclosed in a single protective cover. The cover usually has a point where the line feeds into the block and then where it exits; the rest of the block is covered.
The chain goes over the reel and out, over another reel into another block, then back to the first block and over the second reel. This turns blocking into a system called a tackle, more commonly referred to as a block and tackle. A tackle may contain more than one block, or multiple two-block tackles may operate on the same line.
The purpose of a tackle is to create a mechanical advantage. By sliding the line through the blocks, the operator creates a form of artificial leverage, much like using a lever and fulcrum to move a heavy object. Each time the chain is passed through the block, the system emits more traction force than it entered. As the user pulls on the chain containing the tackle, the multiplicative effect will allow a single person to lift objects weighing many hundreds of pounds with very little effort.
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