Tension Linkages Using Leaf Chain

Leaf chain, sometimes called cable chain or balance chain, is used for tension linkage applications. It consists of steel link plates, with contours that are usually the same as the roller link plates in roller chain, laced on pins in a way that permits the chain to flex freely at each joint. All of the link plates have the same contour to permit the chain to be properly supported when running over a sheave. A typical section of leaf chain is shown in Figure 2-14, as well as a drawing showing a lacing pattern, as it would be shown in the ASME B29.8 standard. Leaf Chain, Clevises, and Sheaves. 

Special types of roller chain, leaf chain, and block chain can be used as tension linkages. Some of these products are described in the American National Standards, but many are manufacturers specials and can only be found in their catalogs or by contacting them directly. Some of these products will be discussed in greater detail. 

Leaf chain probably is the chain most commonly used for tension linkages. Leaf chain is designed specifically for use where the chain does not engage a sprocket or travel through a complete chain revolution. Leaf chain was briefly described in chapter 2 and an example is shown in Figure 8. Complete information on leaf chain is contained in the ASME B29.8 standard. 

The engineering steel chains normally used in tension linkages are relatively heavy chains. They are usually the bar-link or block and bar types of chain, and they are much larger in size and much stronger than the leaf and other chains used for lighter tension linkages. 

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