The present invention relates to coil-in-coil springs and mattresses including coil-in-coil springs. In particular, the present invention relates to coil-in-coil springs that are comprised of a continuous wire and that exhibit a variable and non-linear loading response when compressed.
Typically, when a uniaxial load is applied to a spring, the spring exhibits a linear compression rate. That is to say, it takes twice as much force to compress a typical spring two inches as it does to compress the same spring one inch. The linear response of springs is expressed by Hooke's law, which states that the force (F) needed to extend or compress a spring by some distance (D) is proportional to that distance. This relationship is expressed mathematically as F=kD, where k represents the spring constant for a particular spring. A high spring constant indicates that the spring requires more force to compress, and a low spring constant means the spring requires less force to compress.
Linear response springs, such as wire coil springs, are commonly used as mattress innersprings in combination with padding and upholstery that surround the innersprings. Most mattress innersprings are comprised of an array of wire coil springs which are often adjoined by lacing end convolutions of the coil springs together with cross wires. An advantage of this arrangement is that it is inexpensive to manufacture. However, this type of innerspring often provides a firm and rigid mattress surface.
An alternative to an innerspring mattress is a mattress constructed of one or more foam layers. Unlike an innerspring mattress comprised of an array of wire coil springs, these foam layers exhibit a non-linear response to forces applied to the mattress. In particular, a foam mattress provides more support as the load increases. For instance, a typical foam mattress provides increased support after it has been compressed approximately 60% of the maximum compression of the foam. That non-linear response of foam mattresses is typically regarded as providing improved sleep comfort for a user. However, the mechanical properties of certain foam may degrade over time, which, in turn, affects the overall comfort of the foam mattress. Furthermore, foam mattresses are often more costly to produce than metal spring mattresses.
The present invention includes coil-in-coil springs and mattresses including coil-in-coil springs. In particular, the present invention includes coil-in-coil springs that are comprised of a continuous wire and that exhibit a variable and non-linear loading response when compressed. Thus, the coil-in-coil springs of the present invention provide a user with the non-linear support typically seen in a foam mattress, but through the use of coil-in-coil springs.
In one exemplary embodiment of the present invention, a coil-in-coil spring is provided that is comprised of a continuous wire forming an outer coil and an inner coil, which is positioned within the outer coil. The continuous wire further forms a first spring portion having a first spring constant, a second spring portion having a second spring constant less than the first spring constant, and a third spring portion having a third spring constant less than the first spring constant and less than the second spring constant. Specifically, in some embodiments of the present invention, the third spring portion is positioned above the first spring portion such that the first spring portion and the third spring portion collectively form the outer coil of the coil-in-coil spring, and the second spring portion is positioned within the first spring portion such that the second spring portion forms the inner coil of the coil-in-coil spring. In other embodiments of the present invention, the second spring portion and the third spring portion are both positioned within the first spring portion such that the second spring portion and the third spring portion collectively form the inner coil of the coil-in-coil spring and the first spring portion forms the outer coil of the coil-in-coil spring. In either event, the coil-in-coil spring is configured such that that the outer coil has an uncompressed height which is greater than the uncompressed height of the inner coil.
By forming the continuous wire of an exemplary coil-in-coil spring of the present invention in a manner where the individual spring constants of the first spring portion, the second spring portion, and the third spring portion are variably combined as the coil-in-coil spring compresses, a first overall spring constant of the coil-in-coil spring provides a soft feel as the spring is initially compressed, a second overall spring constant of the coil-in-coil spring provides an intermediate feel as compression of the coil-in-coil spring increases, and a third overall spring constant of the coil-in-coil spring provides a firmer feel as compression of the coil-in-coil spring increases further.
In operation, the outer coil and the inner coil of the exemplary coil-in-coil springs function substantially as two helical springs in parallel. However, because the uncompressed height of the outer coil is greater than the uncompressed height of the inner coil, when a force is first applied to the coil-in-coil spring, only the outer coil begins to compress. Once the coil-in-coil spring is compressed to the point where the compressed height of the outer coil is equal to the uncompressed height of the inner coil, the inner coil is then engaged and the coil-in-coil spring compresses according to the combined spring constant of the outer coil and the inner coil. Furthermore, because the third spring constant of the third spring portion is less than the first spring constant of the first spring portion and also less than the second spring constant of the second spring portion, at some predetermined compression distance the third spring portion becomes fully compressed and deactivated while the first spring portion and the second spring portion continue to compress. In other words, each exemplary coil-in-coil spring initially compresses according to a first overall spring constant that is based on the spring constant of the outer coil. After further compression, the inner coil is engaged such that all spring portions are simultaneously engaged and contribute to a second overall spring constant of the coil-in-coil spring. Further compression then eventually results in the third spring portion becoming deactivated such that a third overall spring constant of the coil-in-coil spring is based on the first spring constant of the first spring portion and the second spring constant of the second spring portion.
As a further refinement to the present invention, additional intermediate coils can also be positioned between the inner coil and the outer coil. For instance, in another exemplary embodiment of the present invention, a multi-coil spring is provided that is comprised of a continuous wire forming an outer coil having an uncompressed height, an intermediate coil positioned within the outer coil and having an uncompressed height less than the uncompressed height of the outer coil, and an inner coil positioned within the intermediate coil and having an uncompressed height less than the uncompressed height of the intermediate coil. As such, in operation, the outer coil, the intermediate coil, and the inner coil function substantially as three helical springs in parallel. When a force is first applied to the multi-coil spring, only the outer coil is engaged and compresses so that a first overall spring constant of the multi-coil spring is based only on the spring constant of the outer coil. Upon further compression, the intermediate coil is then engaged and begins to compress along with the outer coil so that a second overall spring constant of the multi-coil spring is based on the spring constant of the outer coil and the spring constant of the intermediate coil. Upon further compression, the inner coil is subsequently engaged and begins to compress along with the outer coil and the intermediate coil so that a third overall spring constant of the multi-coil spring is based on the spring constant of the outer coil, the spring constant of the intermediate coil, and the spring constant of the inner coil.
Regardless of the particular configuration of the exemplary coil-in-coil springs of the present invention, in some embodiments, each of the coil-in-coil springs, can further be included in a mattress to provide a user with the non-linear support typically seen in a foam mattress, but through the use of coil springs. For example, in some embodiments of the present invention, a mattress is provided that includes a plurality of the coil-in-coil springs described herein above arranged in a matrix. Such a mattress can also comprise an upper body supporting layer, a lower foundation layer, and a sidewall extending between the upper body supporting layer and the lower foundation layer and extending around the entire periphery of the two layers, such that the matrix of coil-in-coil springs is completely surrounded.
Further features and advantages of the present invention will become evident to those of ordinary skill in the art after a study of the description, figures, and non-limiting examples in this document.
The present invention includes coil-in-coil springs and mattresses including coil-in-coil springs. In particular, the present invention includes coil-in-coil springs that are comprised of a continuous wire and that exhibit a variable and non-linear loading response when compressed. Thus, the coil-in-coil springs of the present invention provide a user with the non-linear support typically seen in a foam mattress, but through the use of coil-in-coil springs.
Referring first to
In the coil-in-coil spring 10, the first spring portion 50 has an uncompressed height H1, the second spring portion 60 has an uncompressed height H2, and the third spring portion has an uncompressed height H3. As shown in
The first spring portion 50, the second spring portion 60, and the third spring portion 70 are each formed of a plurality of convolutions of the continuous wire 20 with each convolution made up of a portion of the continuous wire 20 substantially equal to about one turn of the continuous wire 20 (i.e., about 360° of the helical path of the continuous wire 20). Of note, the third spring portion 70 includes an upper end convolution 71, which forms a substantially planar loop at the topmost portion of the coil-in-coil spring 10. Similarly, a lower end 12 of the coil-in-coil spring 10 is also formed of a substantially planar loop at the lowermost portion of the coil-in-coil spring 10. In this way, the coil-in-coil spring 10 terminates at either end in a generally planar form which serve as the supporting end structures of the coil-in-coil spring 10.
With regard to the remaining convolutions of the coil-in-coil spring 10, in most coil springs formed with a helically-spiraling continuous wire, the spring constant and resultant feel of the coil spring are primarily determined by the wire gauge, the total number of convolutions in the coil spring, the size of the convolutions (coil diameter), and the pitch between the convolutions of the coil spring. In this regard, the pitch (or vertical spacing) between each convolution of a coil spring is typically controlled by the rate at which the continuous wire, which forms the coil spring, is drawn through a forming die in a coil-forming machine. Once formed, a larger pitch will typically produce a stiffer coil spring due to the increased vertical orientation of the wire, while a smaller pitch will typically produce a softer coil spring and allow for a larger number of total convolutions in the coil body. Similarly, larger diameter convolutions in a coil spring also contribute to a lower spring constant and consequentially softer coil spring. Of course, because the wire forming the coil-in-coil spring is continuous there is no clearly defined beginning point or ending point of any single convolution. Furthermore, the diameter and pitch is typically adjusted gradually between one portion of the spring to another. As such, oftentimes a single convolution of the coil spring does not, in fact, have just one single diameter or just one single pitch, but may include, for example, a beginning or end portion with a variable diameter and/or pitch that transitions to the adjacent convolution. Therefore, as used herein, the diameter and pitch of a convolution will typically refer to an average diameter and pitch, but can also, in some embodiments, be inclusive of or refer to a maximum diameter and pitch or a minimum diameter and pitch.
In the exemplary coil-in-coil springs described herein (e.g., the coil-in-coil spring 10 shown in
Referring still to
Turning now to the second spring portion 60 of the coil-in-coil spring 10, the second spring portion 60 includes an upper end convolution 67 and six helical intermediate convolutions 61, 62, 63, 64, 65, 66 that extend from the lower end 12 of the coil-in-coil spring 10 to the upper end convolution 67 of the second spring portion 60. Each of the helical intermediate convolutions 61, 62, 63, 64, 65, 66 of the second spring portion 60 has a respective diameter, which are substantially the same and are substantially equal to the diameter of the upper end convolution 67 of the second spring portion 60 such that the second spring portion 60 has a substantially cylindrical shape. The continuous wire 20 also defines a pitch between each of the plurality of helical intermediate convolutions 61, 62, 63, 64, 65, 66 of the second spring portion 60 with the pitch between each of the plurality of helical intermediate convolutions 61, 62, 63, 64, 65, 66 of the second spring portion 60 being less than the pitch between each of the plurality of helical intermediate convolutions 52, 53 of the first spring portion 50.
Turning now to the third spring portion 70 of the coil-in-coil spring 10, the third spring portion 70 includes the upper end convolution 71 and further includes three helical intermediate convolutions 72, 73, 74 that extend from the upper end convolution 71 of the third spring portion 70 to the transition convolution 51 of the first spring portion 50. Each of the plurality of helical intermediate convolutions 72, 73, 74 of the third spring portion 70 has a respective diameter with the diameter of each of the plurality of helical intermediate convolutions 72, 73, 74 progressively increasing as the plurality of helical intermediate convolutions 72, 73, 74 extends from the upper end convolution 71 of the third spring portion 70 to the transition convolution 51 of the first spring portion 50. In particular, the diameter of the first helical intermediate convolution 72 is slightly larger than the diameter of the upper end convolution 71, the diameter of the second helical intermediate convolution 73 is slightly larger than the diameter of the first helical intermediate convolution 72, and the diameter of the third helical intermediate convolution 74 is slightly larger than the diameter of the second helical intermediate convolution 73, such that the third spring portion 70 has a substantially conical shape. In the exemplary coil-in-coil spring 10 shown in
With further regard to the third spring portion 70, the continuous wire 20 again defines a pitch between each of the plurality of helical intermediate convolutions 72, 73, 74 of the third spring portion 70. Specifically, the pitch between each of the plurality of helical intermediate convolutions 72, 73, 74 of the third spring portion 70 is substantially the same, but with the pitch between each of the plurality of helical intermediate convolutions 72, 73, 74 of the third spring portion 70 being less than the pitch between each of the plurality of helical intermediate convolutions 52, 53 of the first spring portion 50 and also being less than the pitch between each of the plurality of helical intermediate convolutions 61, 62, 63, 64, 65, 66 of the second spring portion 60.
As a result of the above-described variance in the pitches and diameters along the length of the continuous wire 20, in the exemplary coil-in-coil spring 10 of
In operation, the first spring portion 50 and the third spring portion 70 of the outer coil 30 of the coil-in-coil spring 10 function substantially as two helical springs in series, whereas the outer coil 30 and the inner coil 40 function substantially as two helical springs in parallel. As discussed above, the uncompressed height Houter of the outer coil 30 is greater than the uncompressed height Hinner of the inner coil 40. As such, when a force is first applied to the coil-in-coil spring 10 only the outer coil 30 begins to compress and the coil-in-coil spring 10 therefore compresses according to the spring constant of the outer coil 30. Once the coil-in-coil spring 10 is compressed to the point where the compressed height of the outer coil 30 is equal to the uncompressed height Hinner of the inner coil 40 (i.e., the second spring portion 60), the inner coil 40 is engaged and the coil-in-coil spring 10 compresses according to the combined spring constant of the outer coil 30 and the inner coil 40. By forming the inner coil 40 with an uncompressed height Hinner less than the uncompressed Houter of the outer coil 30, the coil-in-coil spring 10 therefore exhibits at least two different loading responses.
Furthermore, and independent of the inner coil 40, as the outer coil 30 compresses, initially both the first spring portion 50 and the third spring portion 70 simultaneously compress. At some predetermined compression distance, the third spring portion 70 becomes fully compressed. That is to say, the plurality of helical intermediate convolutions 72, 73, 74 of the third spring portion 70 are unable to compress any further and the third spring portion 70 becomes deactivated. However, at the compression distance when the third spring portion 70 is deactivated, the first spring portion 50 is still capable of additional compression. Therefore, for compression distances past the point where the third spring portion 70 becomes deactivated, the outer coil 30 compresses according to the spring constant of only the first spring portion 50. As such, the outer coil 30 itself also exhibits at least two different loading responses.
Referring now to
After compressing the coil-in-coil spring 10 past the first compression distance D1, further compression of the coil-in-coil spring 10 is according to a second overall spring constant K2 which is greater than the first overall spring constant K1. During this stage of compression, the second spring portion 60 (i.e., the inner coil 40) is engaged along with the first spring portion 50 and the third spring portion 70 which form the outer coil 30. Furthermore, the third spring portion 70 is not yet deactivated such that the both the first spring portion 50 and the third spring portion 70 of the outer coil 30 are simultaneously compressing. As such, the second overall spring constant K2 of the coil-in-coil spring 10 is based on the first spring constant of the first spring portion 50, the second spring constant of the second spring portion 60, and the third spring constant of the third spring portion 70. Compression of the coil-in-coil spring 10 continues according to the second overall spring constant K2 until the coil-in-coil spring reaches a second compression distance D2.
Finally, after compressing the coil-in-coil spring 10 past the second compression distance D2, further compression of the coil-in-coil spring 10 is according to a third overall spring constant K3 which is greater than the second overall spring constant K2. During this stage of compression, the second spring portion 60 (i.e., the inner coil 40) is engaged but the third spring portion 70 is deactivated such that of the outer coil 30 only the first spring portion 50 is compressing. As such, the third overall spring constant K3 of the coil-in-coil spring 10 is based on the first spring constant of the first spring portion 50 and the second spring constant of the second spring portion 60. Compression of the coil-in-coil spring 10 continues according to the third overall spring constant K3 until the coil-in-coil spring 10 reaches a maximum compression.
Although in the exemplary coil-in-coil spring 10 described above, the third spring portion 70 deactivates at a compression distance greater than the compression distance when the second spring portion 60 is engaged, it is understood that by changing the configuration of the first spring portion, the second spring portion, and/or the third spring portion of the coil-in-coil spring that, in some other embodiments of the present invention, the third spring portion of the coil-in-coil spring can be configured to deactivate before the second spring portion is engaged or to deactivate simultaneously with the second spring portion becoming engaged. Furthermore, it should be understood that the above descriptions of the spring portions of the coil-in-coil are merely one exemplary embodiment of the present invention and that spring portions having, for example, different numbers of coils, coil diameters, and/or pitches can also be included in an exemplary coil-in-coil spring without departing from the spirit and scope of the present invention.
Referring now to
Furthermore, in the coil-in-coil spring 110, the first spring portion 150 has an uncompressed height H1, the second spring portion 160 has an uncompressed height H2, and the third spring portion 170 has an uncompressed height H3. As shown in
Of note, and similar to the coil-in-coil spring 10 described above with reference to
Referring still to
Turning now to the second spring portion 160 of the coil-in-coil spring 110, the second spring portion 160 includes a transition convolution 163 and two helical intermediate convolutions 161, 162 extending from the lower end 112 of the coil-in-coil spring 110 to the transition convolution 163. Each of the plurality of helical intermediate convolutions 161, 162 of the second spring portion 160 has a respective diameter, which are substantially the same and are substantially equal to the diameter of the transition convolution 163 of the second spring portion 160, such that the second spring portion 160 also has a substantially cylindrical shape. In this regard, the continuous wire 120 defines a pitch between each of the plurality of helical intermediate convolutions 161, 162 of the second spring portion 160, with each of the pitches being substantially the same, and with each pitch being less than the pitch between each of the plurality of helical intermediate convolutions 152, 153, 154, 155, 156, 157 of the first spring portion 150.
Turning now to the third spring portion 170 of the coil-in-coil spring 110, the third spring portion 170 includes an upper end convolution 174 and three helical intermediate convolutions 171, 172, 173 that extend from the transition convolution 163 of the second spring portion 160 to the upper end convolution 174 of the third spring portion 170. Each of the plurality of helical intermediate convolutions 171, 172, 173 of the third spring portion 170 has a respective diameter with the diameter of each of the plurality of helical intermediate convolutions 171, 172, 173 progressively increasing as the plurality of helical intermediate convolutions 171, 172, 173 extend from the transition convolution 163 of the second spring portion 160 to the upper end convolution 174 of the third spring portion 170. In particular, the diameter of the second helical intermediate convolution 172 is slightly larger than the diameter of the first helical intermediate convolution 171 and the diameter of the third helical intermediate convolution 173 is slightly larger than the diameter of the second helical intermediate convolution 172, such that the third spring portion 170 has an inverted conical shape. In the exemplary coil-in-coil spring 110 shown in
With further regard to the third spring portion 170, the continuous wire 120 also defines a pitch between each of the plurality of helical intermediate convolutions 171, 172, 173 of the third spring portion 170. Specifically, the pitch between each of the plurality of helical intermediate convolutions 171, 172, 173 of the third spring portion 170 is substantially the same, with the pitch between each of the plurality of helical intermediate convolutions 171, 172, 173 of the third spring portion 170 being less than the pitch between each of the plurality of helical intermediate convolutions 152, 153, 154, 155, 156, 157 of the first spring portion 150 and also being less than the pitch between each of the plurality of helical intermediate convolutions 161, 162 of the second spring portion 160.
Similar to the coil-in-coil spring 10 described above with reference to
In operation, in the coil-in-coil spring 110, the second spring portion 160 and the third spring portion 170 of the inner coil 140 of the coil-in-coil spring 110 function substantially as two helical springs in series, whereas the outer coil 130 and the inner coil 140 function substantially as two helical springs in parallel. As discussed above, the uncompressed height Houter of the outer coil 130 is greater than the uncompressed height Hinner of the inner coil 140. As such, when a force is first applied to the coil-in-coil spring 110 only the outer coil 130 (i.e., the first spring portion 150) compresses and the coil-in-coil spring 110 compresses according to the spring constant of the outer coil 130. During this initial compression, the first overall spring constant K1 of the coil-in-coil spring 110 is based only on the first spring constant of the first spring portion 150.
Once the coil-in-coil spring 110 is then compressed to the point where the compressed height of the outer coil 130 is equal to the uncompressed height Hinner of the inner coil 140 (i.e., the uncompressed height H2 of the second spring portion 160 plus the uncompressed height H3 of the third spring portion 170), the inner coil 140 is engaged and the coil-in-coil spring 110 compresses according to the combined spring constant of the outer coil 130 and the inner coil 140. During this stage of compression, the second spring portion 160 and the third spring portion 170, which form the inner coil 140, are both engaged such that the both the second spring portion 160 and the third spring portion 170 of the inner coil 140 are simultaneously compressing. As such, the second overall spring constant K2 of the coil-in-coil spring 110 is based on the first spring constant of the first spring portion 150, the second spring constant of the second spring portion 160, and the third spring constant of the third spring portion 170.
Upon further compression and at a predetermined compression distance, the third spring portion 170 then becomes fully compressed and is deactivated, while the second spring portion 160 is still capable of additional compression. After the third spring portion 170 becomes deactivated, the inner coil 140 then compresses according to the spring constant of only the second spring portion 160. As such, the third overall spring constant K3 of the coil-in-coil spring 110 is based on the first spring constant of the first spring portion 150 and the second spring constant of the second spring portion 160. Compression of the coil-in-coil spring 110 subsequently continues according to the third overall spring constant K3 until the coil-in-coil spring 110 reaches a maximum compression. In other words, the coil-in-coil spring 110 shown in
As a further refinement to the exemplary coil-in-coil spring of the present invention, in some embodiments, the third spring portion can also be positioned below the second spring portion rather than above the second spring portion. Referring now to
Referring still to
Unlike the coil-in-coil spring 110 shown in
Turning now to the second spring portion 260 of the coil-in-coil spring 210, the second spring portion 260 then includes an upper end convolution 263 and two of helical intermediate convolutions 261, 262 that extend from the transition convolution 273 of the third spring portion 270 to the upper end convolution 263 of the second spring portion 260. Each of the plurality of helical intermediate convolutions 261, 262 of the second spring portion 260 has a respective diameter (e.g., about 37 mm), which are substantially the same and are substantially equal to the diameter of the transition convolution 273 of the third spring portion 270, such that the continuous wire 220 forming the second spring portion 260 has a substantially cylindrical shape. The continuous wire 220 further defines a pitch between each of the plurality of helical intermediate convolutions 261-262 of the second spring portion 260. Specifically, the pitch between each of the plurality of helical intermediate convolutions 261, 262 of the second spring portion 260 is substantially the same, but with the pitch between each of the plurality of helical intermediate convolutions 261, 262 of the second spring portion 260 being less than the pitch between each of the plurality of helical intermediate convolutions 252, 253, 254, 255, 256, 257 of the first spring portion 250 and greater than the pitch between each of the plurality of helical intermediate convolutions 271, 272 of the third spring portion 270. For example, in the coil-in-coil spring 210, the pitch between each of the plurality of helical intermediate convolutions 252, 253, 254, 255, 256, 257 of the first spring portion 250 is typically about 61 mm, while the pitch between the plurality of helical intermediate convolutions 261, 262 of the second spring portion 260 is about 14-15 mm and the pitch between each of the plurality of helical intermediate convolutions 271, 272 of the third spring portion 270 is about 10 mm to about 12 mm.
Similar to the coil-in-coil springs 10, 110 described above with reference to
The coil-in-coil spring 210 shown in
As yet another refinement to the present invention, in addition to varying the arrangement of portions of a coil-in-coil spring to provide a variable loading response, additional intermediate coils can also be positioned between the inner coil and the outer coil to provide variation in a loading response. Referring now to
Referring still to
The intermediate coil 360 includes an upper end convolution 368 and a plurality of helical intermediate convolutions 361, 362, 363, 364, 365, 366, 367 that extend from the lower end 312 of the multi-coil spring 310 to the upper end convolution 368 of the intermediate coil 360. Each of the plurality of helical intermediate convolutions 361, 362, 363, 364, 365, 366, 367 of the intermediate coil 360 has a respective diameter (e.g. about 55 mm), which are all substantially the same and are substantially equal to the diameter of the upper end convolution 368 of the intermediate coil 360, such that the continuous wire 320 forming the intermediate coil 360 has a substantially cylindrical shape. Furthermore, the diameter of each the plurality of helical intermediate convolutions 361, 362, 363, 364, 365, 366, 367 and the upper end convolution 368 of the intermediate coil 360 is less than the diameter each of the convolutions of the outer coil 350, such that the intermediate coil 360 does not contact the outer coil 350 when the multi-coil spring 310 is compressed. The continuous wire 320 also defines a pitch between each of the plurality of helical intermediate convolutions 361, 362, 363, 364, 365, 366, 367 of the intermediate coil 360. Specifically, the pitch between each of the plurality of helical intermediate convolutions 361, 362, 363, 364, 365, 366, 367 of the intermediate coil 360 is substantially the same and is less than the pitch between each of the plurality of helical intermediate convolutions 352, 353, 354, 355, 356 of the outer coil 350.
Turning now to the inner coil 370, the inner coil 370 includes a lower end convolution 380 and a plurality of helical intermediate convolutions 371, 372, 373, 374, 375, 376, 377, 378, 379 that extend from the upper end convolution 368 of the intermediate coil 360 to the lower end convolution 380 of the inner coil 370. Each of the plurality of helical intermediate convolutions 371, 372, 373, 374, 375, 376, 377, 378, 379 of the inner coil 370 has a respective diameter (e.g., about 35 mm), which are all substantially the same and are substantially equal to the diameter of the lower end convolution 380 of the inner coil 370, such that the continuous wire 320 forming inner coil 370 also has a substantially cylindrical shape. However, the diameter of each the plurality of helical intermediate convolutions 371, 372, 373, 374, 375, 376, 377, 378, 379 and the lower end convolution 380 of the inner coil 370 is less than the diameter each of the convolutions of the intermediate coil 360, such that the inner coil 370 does not contact the intermediate coil 360 when the multi-coil spring 310 is compressed. The continuous wire 320 also defines a pitch between each of the plurality of helical intermediate convolutions 371, 372, 373, 374, 375, 376, 377, 378, 379 of the inner coil 370, with the pitch between each of the plurality of helical intermediate convolutions 371, 372, 373, 374, 375, 376, 377, 378, 379 of the inner coil 370 being substantially the same and being less than the pitch between each of the plurality of helical intermediate convolutions 361, 362, 363, 364, 365, 366, 367 of the intermediate coil 360.
In operation, the outer coil 350, the intermediate coil 360, and the inner coil 370 function substantially as three helical springs in parallel. As discussed above, the uncompressed height H2 of the intermediate coil 360 is less than the uncompressed height H1 of the outer coil 350 and the uncompressed height H3 of the inner coil 370 is less than the uncompressed height H2 of the intermediate coil 360. As such, when a force is first applied to the multi-coil spring 310, only the outer coil 350 is engaged and compresses so that the first overall spring constant K1 of the multi-coil spring 310 is based only on the spring constant of the outer coil 350. Once the multi-coil spring 310 is compressed to the point where the compressed height of the outer coil 350 is equal to the uncompressed height H2 of the intermediate coil 360, the intermediate coil 360 is then engaged and begins to compress along with the outer coil 350 so that the second overall spring constant K2 of the multi-coil spring 310 is based on the spring constant of the outer coil 350 and the spring constant of the intermediate coil 360. Application of further force to the multi-coil spring 310 subsequently results in compression of both the outer coil 350 and the intermediate coil 360, but the inner coil 370 remains unengaged. Once the multi-coil spring 310 is compressed to the point where the compressed height of the outer coil 350 and the compressed height of the intermediate coil 360 is equal to the uncompressed height H3 of the inner coil 370, however, the inner coil 370 is engaged and begins to compress along with the outer coil 350 and the intermediate coil 360 so that the third overall spring constant K3 of the multi-coil spring 310 is based on the spring constant of the outer coil 350, the spring constant of the intermediate coil 360, and the spring constant of the inner coil 370. The multi-coil spring 310 shown in
Regardless of the particular configuration of the exemplary coil-in-coil springs or multi-coil springs, in some embodiments of the present invention, each of the coil-in-coil springs, can further be included in a mattress to provide a user with the non-linear support typically seen in a foam mattress, but through the use of coil-in-coil or multi-coil springs. For example, and referring now to
Each of the pocketed coil-in-coil springs 520 included in the mattress 500 are arranged in a matrix. The mattress 500 also comprises an upper body supporting layer 503 positioned above the pocketed coil-in-coil springs 520 and a lower foundation layer 504 positioned below the pocketed coil-in-coil springs 520. A sidewall 505 extends between the upper body supporting layer 503 and the lower foundation layer 504 around the entire periphery of the two layers 503, 504, such that the matrix of pocketed coil-in-coil springs 520 is completely surrounded.
In the mattress 500 shown in
One of ordinary skill in the art will recognize that additional embodiments are also possible without departing from the teachings of the present invention or the scope of the claims which follow. This detailed description, and particularly the specific details of the exemplary embodiments disclosed herein, is given primarily for clarity of understanding, and no unnecessary limitations are to be understood therefrom, for modifications will become apparent to those skilled in the art upon reading this disclosure and may be made without departing from the spirit or scope of the claimed invention.
This continuation patent application claims priority to and benefit, under 35 U.S.C. § 120, of U.S. 371 National Stage Non-Provisional patent application Ser. No. 15/322,886, titled “Coil-In-Coil Springs With Non-Linear Loading Responses and Mattresses Including the Same”, filed Dec. 29, 2016, which is a national stage entry of PCT Application Number PCT/US2016/014299, filed Jan. 21, 2016, all of which is incorporated by reference herein.
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Number | Date | Country | |
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Child | 16825569 | US |