Chain

Link chain . Object made up of a succession of rings or segments (links) that are linked together forming a kind of rope or band with great flexibility and resistance. For other meanings of the term see the string page  .

Summary

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  • 1 Advantages and disadvantages
  • 2 types
  • 3 Uses
  • 4 Sources

Advantages and disadvantages

Link chains have an advantage over ropes and belts in that they are generally made of steel, giving them great strength and durability. With respect to the wires of steel they are more convenient for its great flexibility, but usually can not compete with these in tensile strength.

On the other hand, transmission chains favorably replace belts and belts because they can withstand high loads and do not slip, as they are meshed with the teeth of the wheels. A correct and permanent lubrication is an essential condition for the life of the links. Since continued use causes wear on rollers, flanges, and pins, these chains tend to elongate slightly, so an automatic or manual mechanism must be used to restore tension (stretch).

Types

Of links . Each link is actually a small closed O-shaped steel bar. There are also other types of links that are held by hooks bent at their ends (see photo).

Transmission . It is a special model of link chain, which are formed by two or more pieces (called flanges) joined together by a pin. Its design allows it to adapt to the configuration of the toothed wheels, and through the teeth of these they receive or transmit force. This relationship is one of the common types of gears.

The pins are usually roller coated, greatly reducing friction with the wheel teeth. The simplest, such as those used on bicycles, have a succession of double flanges (one on each side of the pin), but there are multiple flange chains for transmission of high efforts.

Applications

Simple link chains are very useful for holding or pulling loads, for tying animals or other types of restraint. The link chains are known since ancient times, and their use is mainly spread for securing the anchors of ships and other uses in seamanship. Flanges and rollers became widespread after the invention of the bicycle and soon found application in a series of machines with the rise of the Industrial Revolution in the 19th century .

 

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