US20070017035A1 - Mattress and Coil-in-Coil Assembly - Google Patents
Mattress and Coil-in-Coil Assembly Download PDFInfo
- Publication number
- US20070017035A1 US20070017035A1 US11/459,825 US45982506A US2007017035A1 US 20070017035 A1 US20070017035 A1 US 20070017035A1 US 45982506 A US45982506 A US 45982506A US 2007017035 A1 US2007017035 A1 US 2007017035A1
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- Prior art keywords
- coil
- mattress
- assembly
- coils
- spring rate
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
- A47C27/04—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with spring inlays
- A47C27/06—Spring inlays
- A47C27/063—Spring inlays wrapped or otherwise protected
- A47C27/064—Pocketed springs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C23/00—Spring mattresses with rigid frame or forming part of the bedstead, e.g. box springs; Divan bases; Slatted bed bases
- A47C23/04—Spring mattresses with rigid frame or forming part of the bedstead, e.g. box springs; Divan bases; Slatted bed bases using springs in compression, e.g. coiled
- A47C23/043—Spring mattresses with rigid frame or forming part of the bedstead, e.g. box springs; Divan bases; Slatted bed bases using springs in compression, e.g. coiled using wound springs
- A47C23/0433—Spring mattresses with rigid frame or forming part of the bedstead, e.g. box springs; Divan bases; Slatted bed bases using springs in compression, e.g. coiled using wound springs of different resilience
Definitions
- the present invention relates to coil-in-coil assemblies for mattresses, cushions, and other bedding or seating products.
- the bonnell coil has been an industry standard for the better part of the 20 th century. It is typically an hour-glass shaped spring, which is relatively inexpensive to manufacture and has become a commodity product.
- An attractive feature of a pocketed coil mattress is that it includes several hundred individually pocketed coils that each respond to the sleeper providing a comfortable feel.
- a bonnell mattress is sturdy and firm and therefore is not as comfortable as a pocketed coil mattress.
- the pocketed coil mattress is considered more comfortable, but less durable and more prone to sagging than the bonnell mattress.
- the pocketed coil mattress costs about twice as much than the bonnell mattress to manufacture. What is needed then, is a coil technology for mattresses, cushions, and other bedding or seating products that would provide at least some of the benefits of both the bonnell and pocketed coil designs.
- a first aspect of the invention provides a mattress comprising a cover, a frame, a plurality of spacing coils and a plurality of coil-in-coil assemblies.
- the coil-in-coil assemblies comprising a first coil and a second coil, the second coil positioned substantially within the first coil, wherein a first end of the second coil projects out of a first end of the first coil.
- a second aspect according to the invention provides a coil-in-coil assembly comprising a first coil and a second coil positioned substantially within the first coil.
- the second coil includes a first end, that projects out of a first end of the first coil.
- FIG. 1 is a partial cut-away view of a mattress including a plurality of spacing coils and coil-in-coil assemblies, in accordance with one embodiment of the present invention
- FIG. 2 illustrates relative positioning of first and second coils, in accordance with one embodiment of the present invention.
- FIG. 3 illustrates a cross-section of spacing coils and coil-in-coil assemblies arranged in a quincunx arrangement, in accordance with one embodiment of the present invention.
- FIG. 1 is a partial cut-away view of a mattress including a plurality of coil-in-coil assemblies, in accordance with one embodiment of the present invention.
- the mattress is shown generally by numeral 10 and the coil-in-coil assembly is shown generally by numeral 30 .
- Mattress 10 includes a cover 12 , a frame 14 , a plurality of spacing coils 16 , and a plurality of the coil-in-coil assemblies 30 .
- Mattress 10 has a generally rectangular configuration that is defined by a top 22 , a bottom 24 , and two identical long sides 26 and two identical short sides 28 .
- Mattress 10 may be a mattress of any size, including standard sizes such as twin, queen, king, or California king sized mattress.
- Mattress 10 may also be a custom or non-standard size mattress constructed to accommodate a particular use or room.
- Cover 12 comprises any standard mattress cover as are well known in the art. Cover 12 encloses top 22 , bottom 24 and sides 26 , 28 . In one embodiment, cover 12 is made of conventional quilted mattress cover material. In one embodiment, cover 12 includes perimeter pads formed of padding material. Cover 12 also includes padding layers formed of foam padding material, cotton padding material, upholstery material, batting and/or other materials suitable to provide cushioning properties, and the number of padding layers used is a matter of choice.
- Frame 14 may be composes of a material such as, for example, wood or a rigid plastic suitable for attaching the plurality of spacing coils 16 , and a plurality of the coil-in-coil assemblies 30 .
- Spacing coils 16 and coil-in-coil assemblies 30 may be attached to frame 14 by nails, screws, staples or other hardware known in the art.
- spacing coils 16 and coil-in-coil assemblies 30 are attached to frame 14 using adhesives, such as, for example, epoxy.
- the spacing coils 16 and the coil-in-coil assemblies 30 may be interconnected with a link 40 .
- Link 40 interconnects adjacent coils.
- FIG. 1 illustrates coil arrangement having a plurality of elongate links 40 connecting each row of coils to an adjacent row of coils.
- coil row A is connected to coil row B using a top link 41 and a bottom link 42 .
- Top link 41 is positioned along the upper turn 15 of each coil and bottom link 42 is positioned along the lower turn 17 of each coil.
- the link 40 may be a spring, which provides resiliency to the mattress 10 .
- the link 40 may be other attachment means for interconnecting the spacing coils 16 and the coil-in-coil assemblies 30 to each other.
- link 40 may comprise a clip or a hog-ring for attaching each individual coil to each adjacent coil.
- coil-in-coil assembly 30 includes a second coil 34 positioned substantially within a first coil 32 .
- Second coil 34 has a diameter that allows insertion into an interior space of the first coil.
- the first coil 32 and the second coil 34 are substantially coaxial.
- the relative positioning of the second coil 34 within the first coil 32 may vary from the illustrated and described embodiments while remaining within the scope of the present invention.
- the first and second coils 32 , 34 may include a variety of types, shapes, configurations, and sizes for providing resistance to compressive forces exerted along axis A.
- Each of the first coils 32 includes a top turn 42 and a bottom turn 44 .
- top turn 42 and bottom turn 44 of each spring are relatively larger in diameter than the intermediate turns 46 .
- a coil spring 30 comprises a first coil in which all of the turns are of the same diameter.
- first coil 32 has three intermediate turns 46 between the top turn 42 and the bottom turn 44 .
- first coil 32 includes two intermediate turns. Those with skill in the art will recognize that the number of intermediate turns 46 may vary depending on the application and the desired amount of support.
- top turn 42 and bottom turn 46 are flat wound turns. With flat wound turns, the top and bottom surfaces 52 , 54 will be planar, with the plane extending perpendicular to the center axis A of each coil assembly 30 .
- first coil 32 comprises a bonnell coil.
- Second coil 34 comprises a pocketed coil having a plurality of turns 56 .
- a first end 62 of second coil 34 projects out of a first end 36 of the first coil 32 such that when a load is not placed upon the mattress 10 , the second coil 34 extends beyond the first coil 32 .
- a second end 64 of the second coil 34 also projects out of a second end 38 of the first coil 32 .
- a mattress with the second coil 34 projecting from both ends 36 , 38 of the first coil 32 allows it to be flipped so that both sides may be used as is well known in the art to prolong the lifespan of the mattress.
- the length of the first and second coils 32 , 34 may vary one relative to another.
- the first coil 32 is shorter than the second coil 34 wherein the second coil 34 may project from the first end 36 and, optionally, the second end 38 , as shown in FIG. 2 .
- the second coil 34 may be equal to or shorter in length than the first coil 32 and project from just the first end 36 .
- relative lengths of the coils may vary and are not limited to the examples provided herein.
- the arrangement of the spacing coils 16 relative to the coil-in-coil assemblies 30 may vary. In one embodiment, as shown in FIG. 3 , four spacing coils 16 and the coil-in-coil assembly 30 may be in a quincunx arrangement. In another embodiment, the spacing coils 16 and coil-in-coil assemblies 30 may be alternatively arranged. Those skilled in the art will recognize that relative arrangement of the coils may vary and are not limited to the example provided herein.
- the spacing coils 16 may be simple coils.
- a simple coil for example, may consist of a bonnell type coil.
- the spacing coils 16 may be coil-in-coil assemblies.
- the spacing coils 16 may be either simple coils or coil-in-coil assemblies.
- the first coil 32 has a first spring rate and the second coil 34 has a second spring rate. In one embodiment, the first spring rate is greater than the first spring rate.
- two different effects may be provided by the compression of the mattress 10 . For example, when a sleeper compresses the mattress 10 surface somewhat, (s)he receives a relatively softer “cushioning effect” provided by compression of just the projecting second coils 34 . When the sleeper increases the compression load of the mattress 10 , (s)he receives a firmer support provided by the simultaneous compression of the first and second coils 32 , 34 .
- the spring rates may be customized within the mattress 10 from region to region.
- first and/or second coils 32 , 34 may include first and/or second coils 32 , 34 with a relatively higher spring rate(s).
- the “feel” of the mattress may be customized.
- a softer “cushioning effect” and less firm support are provided by first and second coils 32 , 34 having a lower spring rate, respectively.
- the first and second coils 32 , 34 may be manufactured from a variety of materials known in the art for providing different spring rate(s).
- coil-in-coil technology described herein is not limited to mattresses.
- the technology may, for example, be applied to cushions and other bedding or seating products.
- cover, frame; spacing coils, and coil-in-coil assemblies may be varied while providing a functional stent with a reduced profile.
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- Mattresses And Other Support Structures For Chairs And Beds (AREA)
Abstract
A mattress and coil-in-coil assembly. The mattress includes a cover, a frame, a plurality of spacing coils, and a plurality of coil-in-coil assemblies. The coil-in-coil assembly includes a first coil and a second coil positioned substantially within the first coil. The second coil is pocketed and projects out of a first end of the first coil.
Description
- This application claims priority to and the benefit of U.S. Provisional Application No. 60/702,268, titled Mattress and Coil-in-Coil Assembly, to Jack Chen, et al., filed Jul. 25, 2005, the entirety of which is incorporated herein by reference.
- The present invention relates to coil-in-coil assemblies for mattresses, cushions, and other bedding or seating products.
- Two coil technologies have been traditionally used for mattresses. One such technology, the bonnell coil, has been an industry standard for the better part of the 20th century. It is typically an hour-glass shaped spring, which is relatively inexpensive to manufacture and has become a commodity product. The other technology, the pocketed coil, also known as the Marshall unit, includes a spring and is considered to be a premium unit used in top-of-the-line bedding. The pocket coil is wrapped in a cloth cover and then sewn or glued together to form a unit. An attractive feature of a pocketed coil mattress is that it includes several hundred individually pocketed coils that each respond to the sleeper providing a comfortable feel.
- A bonnell mattress is sturdy and firm and therefore is not as comfortable as a pocketed coil mattress. The pocketed coil mattress is considered more comfortable, but less durable and more prone to sagging than the bonnell mattress. In addition, the pocketed coil mattress costs about twice as much than the bonnell mattress to manufacture. What is needed then, is a coil technology for mattresses, cushions, and other bedding or seating products that would provide at least some of the benefits of both the bonnell and pocketed coil designs.
- Accordingly, it would be desirable to provide a mattress and a coil-in-coil assembly that would overcome the aforementioned and other limitations.
- A first aspect of the invention provides a mattress comprising a cover, a frame, a plurality of spacing coils and a plurality of coil-in-coil assemblies. The coil-in-coil assemblies comprising a first coil and a second coil, the second coil positioned substantially within the first coil, wherein a first end of the second coil projects out of a first end of the first coil.
- A second aspect according to the invention provides a coil-in-coil assembly comprising a first coil and a second coil positioned substantially within the first coil. The second coil includes a first end, that projects out of a first end of the first coil.
- The foregoing and other features and advantages of the invention will become further apparent from the following description of the presently preferred embodiments, read in conjunction with the accompanying drawings. The detailed description and drawings are merely illustrative of the invention, rather than limiting the scope of the invention being defined by the appended claims and equivalents thereof.
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FIG. 1 is a partial cut-away view of a mattress including a plurality of spacing coils and coil-in-coil assemblies, in accordance with one embodiment of the present invention; -
FIG. 2 illustrates relative positioning of first and second coils, in accordance with one embodiment of the present invention; and -
FIG. 3 illustrates a cross-section of spacing coils and coil-in-coil assemblies arranged in a quincunx arrangement, in accordance with one embodiment of the present invention. - Referring to the drawings,
FIG. 1 is a partial cut-away view of a mattress including a plurality of coil-in-coil assemblies, in accordance with one embodiment of the present invention. The mattress is shown generally bynumeral 10 and the coil-in-coil assembly is shown generally bynumeral 30. Mattress 10 includes acover 12, aframe 14, a plurality ofspacing coils 16, and a plurality of the coil-in-coil assemblies 30. -
Mattress 10 has a generally rectangular configuration that is defined by a top 22, a bottom 24, and two identical long sides 26 and two identical short sides 28. Mattress 10 may be a mattress of any size, including standard sizes such as twin, queen, king, or California king sized mattress. Mattress 10 may also be a custom or non-standard size mattress constructed to accommodate a particular use or room. -
Cover 12 comprises any standard mattress cover as are well known in the art.Cover 12 encloses top 22, bottom 24 and sides 26, 28. In one embodiment,cover 12 is made of conventional quilted mattress cover material. In one embodiment,cover 12 includes perimeter pads formed of padding material.Cover 12 also includes padding layers formed of foam padding material, cotton padding material, upholstery material, batting and/or other materials suitable to provide cushioning properties, and the number of padding layers used is a matter of choice. -
Frame 14 may be composes of a material such as, for example, wood or a rigid plastic suitable for attaching the plurality ofspacing coils 16, and a plurality of the coil-in-coil assemblies 30.Spacing coils 16 and coil-in-coil assemblies 30 may be attached toframe 14 by nails, screws, staples or other hardware known in the art. In other embodiments,spacing coils 16 and coil-in-coil assemblies 30 are attached toframe 14 using adhesives, such as, for example, epoxy. - In one embodiment, the
spacing coils 16 and the coil-in-coil assemblies 30 may be interconnected with alink 40.Link 40 interconnects adjacent coils.FIG. 1 illustrates coil arrangement having a plurality ofelongate links 40 connecting each row of coils to an adjacent row of coils. In an example, coil row A is connected to coil row B using a top link 41 and abottom link 42. Top link 41 is positioned along theupper turn 15 of each coil andbottom link 42 is positioned along thelower turn 17 of each coil. In one embodiment, thelink 40 may be a spring, which provides resiliency to themattress 10. In another or the same embodiment, thelink 40 may be other attachment means for interconnecting thespacing coils 16 and the coil-in-coil assemblies 30 to each other. In an example,link 40 may comprise a clip or a hog-ring for attaching each individual coil to each adjacent coil. - Referring now to
FIG. 2 , coil-in-coil assembly 30 includes asecond coil 34 positioned substantially within afirst coil 32.Second coil 34 has a diameter that allows insertion into an interior space of the first coil. In one embodiment, thefirst coil 32 and thesecond coil 34 are substantially coaxial. Those skilled in the art will recognize that the relative positioning of thesecond coil 34 within thefirst coil 32 may vary from the illustrated and described embodiments while remaining within the scope of the present invention. It will be appreciated by those skilled in the art that the first andsecond coils - Each of the
first coils 32 includes atop turn 42 and abottom turn 44. In one embodiment,top turn 42 andbottom turn 44 of each spring are relatively larger in diameter than theintermediate turns 46. In another embodiment, acoil spring 30 comprises a first coil in which all of the turns are of the same diameter. In one embodiment,first coil 32 has threeintermediate turns 46 between thetop turn 42 and thebottom turn 44. In another embodiment,first coil 32 includes two intermediate turns. Those with skill in the art will recognize that the number ofintermediate turns 46 may vary depending on the application and the desired amount of support. In one embodiment,top turn 42 andbottom turn 46 are flat wound turns. With flat wound turns, the top andbottom surfaces coil assembly 30. In one embodiment,first coil 32 comprises a bonnell coil. -
Second coil 34 comprises a pocketed coil having a plurality ofturns 56. In one embodiment, afirst end 62 ofsecond coil 34 projects out of afirst end 36 of thefirst coil 32 such that when a load is not placed upon themattress 10, thesecond coil 34 extends beyond thefirst coil 32. In one embodiment, asecond end 64 of thesecond coil 34 also projects out of asecond end 38 of thefirst coil 32. A mattress with thesecond coil 34 projecting from both ends 36, 38 of thefirst coil 32 allows it to be flipped so that both sides may be used as is well known in the art to prolong the lifespan of the mattress. - The length of the first and
second coils first coil 32 is shorter than thesecond coil 34 wherein thesecond coil 34 may project from thefirst end 36 and, optionally, thesecond end 38, as shown inFIG. 2 . In another embodiment, thesecond coil 34 may be equal to or shorter in length than thefirst coil 32 and project from just thefirst end 36. Those skilled in the art will recognize that relative lengths of the coils may vary and are not limited to the examples provided herein. - The arrangement of the spacing coils 16 relative to the coil-in-
coil assemblies 30 may vary. In one embodiment, as shown inFIG. 3 , fourspacing coils 16 and the coil-in-coil assembly 30 may be in a quincunx arrangement. In another embodiment, the spacing coils 16 and coil-in-coil assemblies 30 may be alternatively arranged. Those skilled in the art will recognize that relative arrangement of the coils may vary and are not limited to the example provided herein. - In one embodiment, the spacing coils 16 may be simple coils. A simple coil, for example, may consist of a bonnell type coil. In another embodiment, the spacing coils 16 may be coil-in-coil assemblies. In yet another embodiment, the spacing coils 16 may be either simple coils or coil-in-coil assemblies. Those skilled in the art will appreciate that the constitution of the
mattress 10 may vary from the described and illustrated embodiments in terms of the number and type of coils and may also vary within the mattress itself (e.g certain mattresses include a substantially higher density of coil-in-coil assemblies as spacing coils near the center thereby providing a “crown” effect). - In one embodiment, the
first coil 32 has a first spring rate and thesecond coil 34 has a second spring rate. In one embodiment, the first spring rate is greater than the first spring rate. As such, two different effects may be provided by the compression of themattress 10. For example, when a sleeper compresses themattress 10 surface somewhat, (s)he receives a relatively softer “cushioning effect” provided by compression of just the projecting second coils 34. When the sleeper increases the compression load of themattress 10, (s)he receives a firmer support provided by the simultaneous compression of the first andsecond coils mattress 10 from region to region. For example, certain regions of a given mattress requiring additional support may include first and/orsecond coils second coils second coils - Those skilled in the art will appreciate that the coil-in-coil technology described herein is not limited to mattresses. The technology may, for example, be applied to cushions and other bedding or seating products.
- Upon reading the specification and reviewing the drawings hereof, it will become apparent to those skilled in the art that myriad other embodiments of the present invention are possible, and that such embodiments are contemplated and fall within the scope of the presently claimed invention. The scope of the invention is indicated in the appended claims, and all changes that come within the meaning and range of equivalents are intended to be embraced therein.
- While the embodiments of the invention disclosed herein are presently considered to be preferred, various changes and modifications can be made without departing from the spirit and scope of the invention. For example, the cover, frame; spacing coils, and coil-in-coil assemblies may be varied while providing a functional stent with a reduced profile.
Claims (20)
1. A mattress comprising:
a cover;
a frame;
a plurality of spacing coils;
a plurality of coil-in-coil assemblies comprising a first coil and a second coil, the second coil positioned substantially within the first coil; wherein a first end of the second coil projects out of a first end of the first coil.
2. The mattress of claim 1 wherein at least two of the plurality of spacing coils and the coil-in-coil assemblies are connected with a link.
3. The mattress of claim 2 wherein the link comprises a spring.
4. The mattress of claim 1 wherein the second coil includes a second end, wherein the second end of the second coil projects out of a second end of the first coil.
5. The mattress of claim 1 wherein a set of the plurality of spacing coils and coil-in-coil assemblies are arranged in a quincunx arrangement.
6. The mattress of claim 1 wherein the spacing coils comprise at least one of a simple coil and a coil-in-coil assembly.
7. The mattress of claim 1 wherein the first coil comprises a first spring rate and the second coil comprises a second spring rate
8. The mattress of claim 7 wherein the first spring rate is greater than the greater spring rate.
9. The mattress of claim 7 wherein the first spring rate and second spring rate are customized.
10. The mattress of claim 1 wherein the second coil comprises a pocketed coil.
11. A coil-in-coil assembly comprising:
a first coil;
a second coil positioned substantially within the first coil; wherein the second coil includes a first end, the first end of the second coil projects out of a first end of the first coil.
12. The assembly of claim 11 wherein the second coil includes a second end, wherein the second end of the second coil projects out of a second end of the first coil.
13. The assembly of claim 11 wherein the first coil comprises a first spring rate and the second coil comprises a second spring rate.
14. The assembly of claim 13 wherein the first spring rate is greater than the second spring rate.
15. The assembly of claim 14 wherein the first spring rate and the second spring rate are customized.
16. The assembly of claim 11 further comprising four spacing coils positioned about the pocketed coil-in-coil assembly in a quincunx arrangement.
17. The assembly of claim 15 wherein the spacing coils comprise at least one of a simple coil and the coil-in-coil assembly.
18. The assembly of claim 15 wherein a set of the four spacing coils and the coil-in-coil assembly are connected with a link.
19. The assembly of claim 17 wherein the link comprises a spring.
20. The assembly of claim 11 wherein the second coil comprises a pocketed coil.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/459,825 US20070017035A1 (en) | 2005-07-25 | 2006-07-25 | Mattress and Coil-in-Coil Assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US70226805P | 2005-07-25 | 2005-07-25 | |
US11/459,825 US20070017035A1 (en) | 2005-07-25 | 2006-07-25 | Mattress and Coil-in-Coil Assembly |
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US20070017035A1 true US20070017035A1 (en) | 2007-01-25 |
Family
ID=37677702
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US11/459,825 Abandoned US20070017035A1 (en) | 2005-07-25 | 2006-07-25 | Mattress and Coil-in-Coil Assembly |
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US (1) | US20070017035A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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US20100101027A1 (en) * | 2008-08-29 | 2010-04-29 | Select-O-Pedic Bedding Pty Ltd | Innerspring Mattress System |
WO2010120886A1 (en) * | 2009-04-14 | 2010-10-21 | Sealy Technology Llc | Coil-in-coil springs and innersprings |
KR101054454B1 (en) * | 2011-03-09 | 2011-08-04 | (주)금성토탈퍼니처 | Duplex shock-absorbing coil for mattress |
US20120186027A1 (en) * | 2003-02-19 | 2012-07-26 | Dreamwell, Ltd. | Multi-stranded coil spring |
WO2015105570A1 (en) | 2014-01-08 | 2015-07-16 | L&P Property Management Company | Pocketed spring assembley |
US20160029809A1 (en) * | 2013-03-14 | 2016-02-04 | Sealy Technology, Llc | Encased asymmetric coil innersprings with alternating coil spring orientations |
WO2017105454A1 (en) * | 2015-12-17 | 2017-06-22 | Sealy Technology, Llc | Coil-in-coil spring with variable loading response and mattresses including the same |
WO2017127082A1 (en) * | 2016-01-21 | 2017-07-27 | Sealy Technology, Llc | Coil-in-coil springs with non-linear loading responses and mattresses including the same |
US10598242B2 (en) | 2016-05-20 | 2020-03-24 | Sealy Technology, Llc | Coil springs with non-linear loading responses and mattresses including the same |
US20200307990A1 (en) * | 2016-03-09 | 2020-10-01 | Harrison Spinks Components Limited | Apparatus and method for making a resilient unit |
US11076705B2 (en) | 2014-05-30 | 2021-08-03 | Sealy Technology, Llc | Spring core with integrated cushioning layer |
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US20120186027A1 (en) * | 2003-02-19 | 2012-07-26 | Dreamwell, Ltd. | Multi-stranded coil spring |
US8689380B2 (en) * | 2003-02-19 | 2014-04-08 | Dreamwell, Ltd. | Multi-stranded coil spring |
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US20160029809A1 (en) * | 2013-03-14 | 2016-02-04 | Sealy Technology, Llc | Encased asymmetric coil innersprings with alternating coil spring orientations |
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