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Chain couplings connect sections of chain or objects. Roller chain couplings are used in heavy-duty applications like connecting rail cars, while ball chain couplings are used in jewelry and smaller applications. They allow for versatility and adaptability in design.
Chain joints are devices that are used in a number of different applications, ranging from heavy equipment to jewelry making. A basic definition for a chain coupling is a device that is used as a means to connect one or more sections or lengths of chain, or to connect a length of chain to an object. There are a number of chain coupling designs in common use today, with the roller chain coupling and ball chain coupling being two of the most commonly employed.
Heavy-duty couplings are often used in connecting rail cars to a train engine and between cars. The design of these particular couplings in fact allows the train to move efficiently as the chain mechanisms help regulate the speed of each train in the succession of carriages so that they essentially function as a single, albeit flexible, unit. To speed up the linking process, a rail car coupling chain can be quickly locked into place and remains secure until the couplings are disengaged manually or via a remote device. Roller chain couplings are often used in these types of applications.
A ball chain coupling is a simplistic design that is often used to connect smaller chains or even in the design of jewelry such as necklaces or bracelets. For example, the coupling can be used to add a length of chain to a pull chain on a light fixture, by simply inserting one end of the new length into one side of the fixture and the end of the existing pull chain into the other. This strategy can be used to lengthen chains used with ceiling fans, as well as floor or other lamps. Joints of this type are readily available in a number of retail environments, including hardware stores, discount retail stores that sell lamps and basic home electrical supplies, and even in home decorating stores.
With jewelry, a chain link is sometimes used to create a design that allows the wearer to add or subtract length at will. Sometimes this is accomplished by adding or removing small sections of decorative chain or actually removing other elements in the design to achieve the desired look and length. In fact, with this type of application, the chain coupling makes the piece of jewelery versatile, as the addition or removal of elements allows the piece to be adapted to practically any type of occasion.
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