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A box spring is a set of strong, coiled springs that are shrouded in cloth or synthetic fabric.
Box springs are typically lightweight, but they are very sturdy. Box springs provide an extra layer of cushioning between the mattress and floor, leading to less damage to both the bed and the underlying flooring.
Usually the box-spring is placed on top of a wooden or metal bedframe which sits on the floor and acts as a brace. The box-spring is usually the same size as the much softer mattress which is placed above the box-spring. Working together, the frame, box-spring, and mattress make up a bed. It is common to find a box-spring and mattress being used together without the support of a frame underneath, the box spring being mounted directly on casters standing on the floor.
why we use pocket spring?
The purpose of the box-spring is threefold:
1, to raise the mattress' height, making it easier to get in and out of bed;
2, to absorb shock and reduce wear to the mattress; and
3, to create a flat and firm structure for the mattress to lie upon.
Box springs provide both height and rigidity to your mattress. With larger mattresses, where partners typically sleep in the same position, a box spring is essential to keep a mattress level year after year. The height gained by using a box spring mattress makes it much easier to get in and out of bed, and box springs themselves are designed so that the mattresses won't wear out after just a few years of use. Box springs absorb the impact transmitted through mattresses from rough handling and use.
In many places of the world, beds do not need a box-spring, but most traditional western frame or four poster beds require one. For example, in japan a futon mattress might be placed directly on the floor or on a frame but never on a boxspring.
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