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词条 Mattress coil
释义

  1. Types

  2. History

  3. Manufacturers

  4. See also

  5. References

{{short description|A component of a mattress.}}

Mattress coils, also known as mattress springs, are coil springs used in a mattress. Coils are primarily used in the core (support layer) of innerspring mattresses, which is their original use. In recent years, small "micro-coils" are being used in the upholstery (comfort layer) of mattresses, primarily with a coil core ("coil-on-coil" construction), but sometimes with other core types.

Mattress coils were introduced in the mid-late 19th century, and remain popular in the 21st century, particularly in the United States.

Types

There are four types of mattress coils. A key desiderata is "response range", meaning the change in firmness as the spring is compressed – initially soft, to conform to the body, then hard, to provide support. In increasing order of response range and cost, the types are:[1][2]

  • Continuous coils (the Leggett & Platt brand name is "Mira-coil") is an innerspring configuration in which the rows of coils are formed from a single piece of wire. They work in a hinging effect similar to that of offset coils.
  • Bonnell coils are the oldest and most common. First adapted from buggy seat springs of the 19th century, they are still prevalent in mid-priced mattresses. Bonnell springs are a knotted, round-top, hourglass-shaped steel wire coil. When laced together with cross wire helicals, these coils form the simplest innerspring unit, also referred to as a Bonnell unit.
  • Offset coils are an hourglass type coil on which portions of the top and bottom convolutions have been flattened. In assembling the innerspring unit, these flat segments of wire are hinged together with helical wires. The hinging effect of the unit is designed to conform to body shape. LFK (Left Facing Knot) coils are an offset coil with a cylindrical or columnar shape.
  • Marshall coils, also known as wrapped or encased coils or pocket springs, are thin-gauge, barrel-shaped, knotless coils individually encased in fabric pockets—normally a fabric from man-made, non-woven fiber. Some manufacturers pre-compress these coils, which makes the mattress firmer and allows for motion separation between the sides of the bed. As the springs are not wired together, they work more or less independently: the weight on one spring does not affect its neighbors. This allows them to react to pressure independently instead of all together, which minimizes movement and allows for a more buoyant feel.[3] More than half the consumers who participated in a survey had chosen to buy pocket spring mattresses.[4]

History

While coil springs were invented in the 15th century, they were not used in mattresses until the mid-late 19th century, following the use of upholstery coil springs in furniture and carriages.

Microcoils were introduced in the early 21st century, and {{as of|2014|lc=1}} are a small part of the market.[5]

The bed coil spring was patented by Louis Andrew Vargha. Some modern feedback on coils within mattresses cast aspersions on

some of its attributes such as abrasion on coils eventually culminating into prodding,[6] and the audibility of the coils, as it may decrease privacy for intimate moments such as sexual activity.[7]

Manufacturers

The mattress coil market is quite concentrated – the leading suppliers are Leggett & Platt (founded 1883) of Carthage, Missouri {{citation needed|date=August 2014}} and HSM Solutions (formally Hickory Springs, founded 1944) of Hickory, North Carolina; others include Spinks Springs (founded 1840) of Leeds, United Kingdom and Subiñas (founded 1959) of Biscay, Spain.{{citation needed|date=July 2017}}. Raha mattresses are the leading mattress manufacturers in Gulf region. Cloudnine mattress is the luxury segment of Poly Products-manufacturer of Raha mattresses.

See also

  • Upholstery coil springs

References

1. ^{{cite web|title=Mattress support cores - Innersprings|url=https://www.themattressunderground.com/mattresses/support-cores/innersprings.html|publisher=The Mattress Underground|accessdate=21 July 2017|language=en-gb}}
2. ^{{cite web|last1=Auer|first1=Joe|title=Mattress Coils: Considerations When Purchasing a Mattress|url=https://www.mattressclarity.com/blog/mattress-coils/|website=Mattress Clarity|accessdate=20 July 2017|date=5 February 2017}}
3. ^{{Cite web|url=https://purple.com/mattress-types/pocket-coil-mattresses|title=Pocket Coils – Purple|website=purple.com|access-date=2019-02-13}}
4. ^{{Cite web|url=https://www.which.co.uk/reviews/mattresses/article/choosing-the-best-type-of-mattress|title=Choosing The Best Mattress Type|website=Which?|language=en|access-date=2019-02-13}}
5. ^{{cite web|title=Mattress comfort layers - Microcoils|url=https://www.themattressunderground.com/mattresses/comfort-layers/microcoils.html|publisher=The Mattress Underground|accessdate=20 July 2017|language=en-gb}}
6. ^Jacobson, Bert H., et al. "Effect of prescribed sleep surfaces on back pain and sleep quality in patients diagnosed with low back and shoulder pain." Applied ergonomics 42.1 (2010): 91-97.
7. ^Rizzo, Terrie Heinrich. "Sleep matters: learn smart strategies to make sure your body gets the zzzzzs it needs." IDEA Fitness Journal 4.5 (2007): 102-104.
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