There are two primary spring systems used in constructing upholstered furniture; eight-way hand-tied (below) and sinuous.
Eight-way hand-tied springs are used in the base of better quality pieces and are often considered a sign of quality. These three dimensional coils are attached to webbing on the bottom of the sofa or chair. The craftsman then individually ties heavy gauge coils from front to back, side to side and diagonally (eight ways). Eight-way hand-tied springs have a wide range of movement providing a very even and individual "sit", because they move up and down and side to side. This system gives the product an even comfort level and has the advantage of never "bottoming-out".This process costs more because it is time consuming and can only be done by hand.
|Sinuous springs are two dimensional "S" shaped heavy gauge steel springs that are fastened to the top of the front rail and run from the front to the back of the piece every few inches apart. This spring system offers a somewhat softer seat and can be used in pieces that sit lower to the ground as in many contemporary designs. While less costly to produce, it is not necessarily the sign of an inferior product. The quality and quantity of springs utilized is more an issue than which system is selected.Furniture manufacturers sometimes use drop-in Springs, which are mass-manufactured welded units that are more cheaply manufactured and considered to be of lower quality than sinuous springs. When the spring system is finished with a top layer of padding, it is commonly called the "seat deck"|
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