I found this great article and demonstration about the spring system and thought it would be useful to share.
Spring systems
Once the frame is constructed, a spring system is installed to support the seating area. Furniture manufacturers employ two main types of spring support systems: standard springs, zig zag Springs and eight-way hand tied springs, coil springs. When the spring system is finished with a top layer of padding, it is commonly called the "seat deck".
Standard springs provide good support at a lower price than the alternative. Most manufacturers offer either sinuous springs or drop-in-springs as their standard, depending on how they make their furniture. Both types affix to the frame to support the seat deck. Standard springs have a formal, very firm "sit" and only move in the up/down direction. In contrast, eight-way hand-tied springs can move in many more directions.
Sinuous springs are heavy-gauge steel springs that have been heat-formed into continuous "S" shapes. They are cut into lengths and affixed to the frame. Drop-in springs are mass-manufactured, welded units that are more cheaply manufactured and considered to be of lower quality than sinuous springs.
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 from side to side. In the construction of these systems, the craftsman individually ties heavy-gauge coils from front to back, side to side and diagonally (eight ways) to provide the highest level of quality, comfort and durability. This process costs more because it is time consuming and can only be done by hand.
And while you're studying this, here are some pieces of great refurbished furniture that do have the hand-tied 8-way coil spring system.
Huron Chair and Ottoman |
Bloomscraft Wingback Chair |
Lanier Chairs in Duralee Ikat |
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