mattress

Abstract

To provide a mattress for enabling a natural side-lying state and enhancing quality of a sleep.SOLUTION: A mattress 1 includes: a first part 10 for supporting the head of a person; a second part 20 adjacent to the first part 10 so as to support the hips of the person; and a third part 30 adjacent to the second part 20 so as to support the legs of the person. The height of a cushion of the third part 30 is larger than the height of a cushion of the second part 20. The hardness and the filamentous fiber density of the cushion of the second part 20 are larger than those of the first part 10. The hardness and the filamentous fiber density of the cushion of the third part 30 are smaller than those of the first part 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a mattress for supporting a person in a recumbent position. [Background technology]

[0002] Mattresses are known as products that support a person in a recumbent position. For example, Patent Document 1 discloses a mattress that includes a cushion made of urethane and a cover that covers the cushion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-188931 Summary of the Invention [Problem to be solved by the invention]

[0004] To improve the quality of sleep, it is preferable that the mattress provide a natural lying position. [Means for solving the problem]

[0005] The present invention provides a mattress for supporting a person in a recumbent position, comprising: a first portion that supports the person's head; a second portion adjacent to the first portion and configured to support the person's lower back; a third portion adjacent to the second portion and configured to support the person's legs; The mattress has a cushion height in the third portion greater than a cushion height in the second portion.

[0006] In the mattress according to the present invention, the height of the cushion in the third portion may be greater than the height of the cushion in the second portion by 20 mm or more.

[0007] In a mattress according to the present invention, the mattress may include a first end that is an end located closer to the person's head and a second end that is an end located closer to the person's legs, and the third portion may extend to the second end.

[0008] In the mattress of the present invention, the cushion of the third portion may include a wall surface facing the second portion, an upper surface, and a chamfered corner located between the wall surface and the upper surface.

[0009] In the mattress according to the present invention, the corners may have a chamfer dimension of 20 mm or more.

[0010] In the mattress according to the present invention, the corners may be curved.

[0011] In the mattress of the present invention, the cushion of the first portion may have a first hardness, the cushion of the second portion may have a second hardness that is at least 15% greater than the first hardness, and the cushion of the third portion may have a third hardness that is at least 10% less than the first hardness.

[0012] In the mattress according to the present invention, the cushions of the first, second and third portions may be made up of a plurality of intertwined resin threads.

[0013] In a mattress according to the present invention, the density of the resin threads in the second portion may be greater than the density of the resin threads in the first portion, and the density of the resin threads in the third portion may be less than the density of the resin threads in the first portion.

[0014] In the mattress of the present invention, the cushion of the third portion includes a first layer and a second layer located below the first layer, and the density of the resin thread in the second layer may be greater than the density of the resin thread in the first layer.

[0015] In the mattress according to the present invention, the cushion of the first portion may include a central region and side regions located on both sides of the central region, and the hardness of the central region may be less than the hardness of the side regions. [Effects of the Invention]

[0016] According to the present invention, the quality of sleep can be improved. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing an example of a mattress. [Figure 2] FIG. 1 is a plan view showing an example of a mattress. [Figure 3] FIG. 10 shows how the mattress is folded. [Figure 4] 3 is a cross-sectional view of the mattress 1 of FIG. 2 as viewed from the direction AA. [Figure 5] FIG. 1 is a diagram showing an example of a material that constitutes a cushion of a mattress. [Figure 6] FIG. 2 is a cross-sectional view showing an example of the layer structure of a mattress cushion. [Figure 7] FIG. 10 is a plan view showing a modified example of the mattress. [Figure 8] FIG. 8 is a diagram showing an example of the hardness distribution of the mattress of FIG. 7. [Figure 9] FIG. 10 is a plan view showing a modified example of the mattress. [Figure 10] FIG. 10 is a plan view showing a modified example of the mattress. [Figure 11] FIG. 10 is a cross-sectional view showing a modified example of a mattress. [Figure 12] FIG. 10 is a diagram showing evaluation results of the amount of sinking. [Figure 13] FIG. 10 is a diagram showing the results of evaluation of blood flow. [Figure 14] FIG. 10 is a diagram showing the evaluation results of electroencephalograms. [Figure 15] FIG. 10 is a diagram showing the results of electrocardiogram evaluation. [Figure 16] FIG. 10 is a diagram showing the evaluation results of body pressure distribution. DETAILED DESCRIPTION OF THE INVENTION

[0018] A mattress according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the embodiment shown below is an example of an embodiment of the present invention, and the present invention should not be interpreted as being limited to these embodiments. Furthermore, in the drawings referred to in this specification, identical parts or parts having similar functions are given the same or similar symbols, and repeated explanations thereof may be omitted. Furthermore, the dimensional ratios of the drawings may differ from the actual ratios for the sake of explanation. Furthermore, some components may be omitted from the drawings.

[0019] As used in this specification, terms such as "parallel," "orthogonal," and "identical," which specify shapes and geometric conditions and their degrees, as well as values ​​of lengths and angles, are not bound by strict meanings but are interpreted to include a range within which similar functions can be expected.

[0020] In this specification, when multiple upper limit value candidates and multiple lower limit value candidates are listed for a certain parameter, the numerical range of the parameter may be constructed by combining any one upper limit value candidate with any one lower limit value candidate. For example, consider a description that reads, "Parameter B may be, for example, greater than or equal to A1 and greater than or equal to A2. Parameter B may be, for example, less than or equal to A3 and less than or equal to A4." In this case, the numerical range of parameter B may be greater than or equal to A1 and less than or equal to A3, greater than or equal to A1 and less than or equal to A4, greater than or equal to A2 and less than or equal to A3, or greater than or equal to A2 and less than or equal to A4.

[0021] (mattress) 1 and 2 are a perspective view and a plan view showing an example of a mattress 1. The mattress 1 supports a person in a recumbent position. The direction from the person's head to their legs in the in-plane direction of the mattress 1 supporting the person is also referred to as the length direction D1. The direction perpendicular to the length direction D1 in the in-plane direction of the mattress 1 supporting the person is also referred to as the width direction D2. The end of the mattress 1 on the head side in the length direction D1 is referred to as the first end 3, and the end of the mattress 1 on the leg side in the length direction D1 is referred to as the second end 4. The end of the mattress 1 in the width direction D2 is referred to as the side end 5.

[0022] The mattress 1 comprises a first portion 10, a second portion 20, and a third portion 30 aligned in a longitudinal direction D1. The second portion 20 is adjacent to the first portion 10 in the longitudinal direction D1. The second portion 20 may be in contact with the first portion 10. The third portion 30 is adjacent to the second portion 20 in the longitudinal direction D1. The third portion 30 may be in contact with the second portion 20.

[0023] The first part 10 supports the person's head. The second part 20 supports the person's waist. The third part 30 supports the person's legs. For example, the third part 30 supports at least the part from the knee to the toes. The part from the groin to the knee may be supported by the second part 20 or the third part 30.

[0024] The mattress 1 may be configured to be foldable. Figure 3 shows how the mattress 1 is folded at two locations. In this case, the first portion 10, the second portion 20, and the third portion 30 may be defined based on the folding boundaries. The mattress 1 includes a first connecting portion 41 that connects the first portion 10 and the second portion 20, and a second connecting portion 42 that connects the second portion 20 and the third portion 30. The first connecting portion 41 connects the upper surface 101 of the first portion 10 to the upper surface 201 of the second portion 20. The second connecting portion 42 connects the lower surface 202 of the second portion 20 to the lower surface 302 of the third portion 30.

[0025] The foldability of the mattress 1 improves the transportability and storage properties of the mattress 1. Furthermore, the mechanical properties and shapes of the first portion 10, the second portion 20, and the third portion 30 can be determined independently. Furthermore, the mattress 1 can be easily repaired. For example, if the mechanical properties of the third portion 30 deteriorate, the mattress 1 can be repaired by replacing only the third portion 30.

[0026] FIG. 4 is a cross-sectional view of the mattress 1 of FIG. 2 as viewed from the direction AA. The first portion 10 includes a first cushion 11 and a first cover 12 that covers the first cushion 11. Similarly, the second portion 20 includes a second cushion 21 and a second cover 22 that covers the second cushion 21. Similarly, the third portion 30 includes a third cushion 31 and a third cover 32 that covers the third cushion 31. The cushions 11, 21, and 31 are independent of each other. The first connecting portion 41 described above connects the first cover 12 and the second cover 22 on the upper surfaces 101 and 201. The second connecting portion 42 described above connects the second cover 22 and the third cover 32 on the lower surfaces 202 and 302.

[0027] In Fig. 4, symbols T1, T2, and T3 respectively represent the height of the first cushion 11, the height of the second cushion 21, and the height of the third cushion 31. As shown in Fig. 4, the height T1 of the first cushion 11 may be the same as the height T2 of the second cushion 21. Although not shown, the height T1 of the first cushion 11 may be greater or smaller than the height T2 of the second cushion 21.

[0028] As shown in FIG. 4, the height T3 of the third cushion 31 is greater than the height T2 of the second cushion 21. This allows the position of the person's toes to be elevated. This improves the circulation of blood and lymphatic fluid compared to when the height T3 is the same as the height T2. It also reduces the repulsive force that the heel receives from the mattress 1. This, for example, can relax the person's body and mind, improving the quality of sleep.

[0029] Research has shown that the posture a person assumes in a zero-gravity environment is the one that allows the person to most relax both physically and mentally. In a zero-gravity environment, the toes are positioned higher than the waist. According to this embodiment, by making the height T3 of the third cushion 31 greater than the height T2 of the second cushion 21, the toes can be positioned higher than the waist.

[0030] Furthermore, raising the position of a person's feet can cause the lower back to bend, which can disperse body pressure on the lower back and alleviate lower back pain.

[0031] The difference between height T3 and height T2 is, for example, 20 mm or more, or may be 30 mm or more, or 40 mm or more. By making the difference between height T3 and height T2 20 mm or more, it is possible to improve the circulation of blood and lymph. On the other hand, if the difference between height T3 and height T2 is too large, it may cause tension in the human body. Taking this into consideration, the difference between height T3 and height T2 may be, for example, 100 mm or less, or may be 80 mm or less.

[0032] The heights T1, T2, and T3 are measured at the position of the cushion on which a person lies. For example, in the case of a mattress 1 for a single bed, the heights T1, T2, and T3 are measured at the center position in the width direction D2.

[0033] As shown in FIG. 4, the third cushion 31 includes a corner 304 located between the upper surface 301 and the wall surface 303. The wall surface 303 is located between the upper surface 301 and the lower surface 302 and extends in the height direction D3. As shown in FIG. 4, the corner 304 located between the upper surface 301 and the wall surface 303 facing the second cushion 21 may be chamfered. "Chamfered" means that in a cross-sectional view such as FIG. 4, the corner 304 is located inward from the intersection of an extension line of the upper surface 301 and an extension line of the wall surface 303. "Inward" refers to the side facing the center of the third cushion 31.

[0034] If the height T3 of the third cushion 31 is greater than the height T2 of the second cushion 21, the backs of the legs come into contact with the corners 304. For example, the backs of the thighs come into contact with the corners 304. If the corners 304 are angular, the legs may be compressed, impeding the circulation of blood and lymph. In this embodiment, the corners 304 are chamfered, which prevents the legs from being compressed by the corners 304. Therefore, the circulation of blood and lymph can be improved compared to when the corners 304 are angular.

[0035] The degree of chamfering at corner 304 is represented by chamfer dimension R. As shown in FIG. 4, chamfer dimension R is the distance in the longitudinal direction D1 from the point where the height of top surface 301 begins to decrease to wall surface 303. Chamfer dimension R is, for example, 20 mm or more, and may be 30 mm or more, or 40 mm or more. By making chamfer dimension R 20 mm or more, pressure on the legs by corner 304 can be suppressed. On the other hand, if chamfer dimension R is too large, the contact area between the person's body and third portion 30 will be reduced, which may increase the strain on the body. In consideration of this, chamfer dimension R may be, for example, 100 mm or less, or 80 mm or less.

[0036] 4, the corner 304 may be curved. In this case, the chamfer dimension R of the corner 304 may be the radius of curvature of the corner 304.

[0037] As shown in FIG. 4, the third portion 30 may extend to the second end 4 in the longitudinal direction D1. That is, the third portion 30 may have a height T3 greater than that of the second portion 20, extending to the second end 4. This allows the toes to be positioned higher than the waist with greater certainty. Note that the phrase "the third portion 30 extends to the second end 4" does not exclude the presence of a corner 304 between the top surface 301 and the wall surface 303 of the third portion 30 at the second end 4, as shown in FIG. 4.

[0038] The hardness of each of the cushions 11, 21, 31 may be the same or different. An example in which the hardness of each of the cushions 11, 21, 31 is different will be described below, with the hardness of the first cushion 11 as the reference.

[0039] The hardnesses of the first cushion 11, the second cushion 21, and the third cushion 31 are referred to as a first hardness H1, a second hardness H2, and a third hardness H3, respectively. The second hardness H2 may be greater than the first hardness H1. For example, the second hardness H2 may be 15% or more greater than the first hardness H1, 20% or more greater, 25% or more greater, or 30% or more greater. "15% or more greater" means that (H2-H1) x 100 / H1 is 15 or greater. The third hardness H3 may be smaller than the first hardness H1. For example, the third hardness H3 may be 10% or more smaller than the first hardness H1, 15% or more smaller, or 20% or more smaller. "10% or more smaller" means that (H1-H3) x 100 / H1 is 10 or more.

[0040] The hardness H1, H2, and H3 of each cushion 11, 21, and 31 may be measured based on JIS K 6400-2 Method A or a method similar to JIS K 6400-2 Method A. For example, a hardness measuring device compresses the cushion between a pressure plate that is movable in the height direction D3 and a fixed support plate. Specifically, the process of compressing the cushion until the thickness of the cushion is 70% of its initial thickness is repeated three times, and then the cushion is compressed until the thickness of the cushion is 40% of its initial thickness. The force applied to the pressure plate when the cushion is compressed to 40% of its initial thickness is calculated as the hardness of the cushion. The measurement conditions are as follows: Height movement speed of pressure plate: 100±20mm / min · Shape of pressure plate in plan view: Circular with a diameter of 200±30mm Measurement environment: Temperature 25°C, relative humidity 50%RH

[0041] Like the heights T1, T2, and T3, the hardness H1, H2, and H3 are measured at the position of the cushion where a person lies down. For example, in the case of a mattress 1 for a single bed, the hardness H1, H2, and H3 are measured at the center position in the width direction D2.

[0042] Next, the material of the cushion will be described. FIG. 5 shows an example of the structure of the material that constitutes the cushion. Each cushion 11, 21, 31 may be composed of a plurality of intertwined resin threads 50. In this case, each cushion 11, 21, 31 includes a contact portion 51 where two resin threads 50 come into contact. At the contact portion 51, the two resin threads 50 may be joined. The material of the resin threads is a thermoplastic resin, a thermoplastic elastomer, or the like.

[0043] In the example shown in FIG. 5, voids 52 are formed in the space other than the contact portion 51. The voids 52 allow air to pass through. Therefore, the breathability of the cushion can be improved compared to when the cushion is made of urethane as in the above-mentioned Patent Document 1. This also contributes to improving the quality of sleep. For example, the occurrence of bedsores can be suppressed. The above-mentioned improvement in blood circulation can also contribute to the suppression of bedsores.

[0044] When the cushion is made of resin threads 50, the greater the density of the resin threads 50, the greater the hardness of the cushion. The difference in hardness among the cushions 11, 21, and 31 may be achieved by adjusting the density of the resin threads 50. For example, the density of the resin threads 50 in the second cushion 21 may be greater than the density of the resin threads 50 in the first cushion 11. For example, the density of the resin threads 50 in the third cushion 31 may be less than the density of the resin threads 50 in the first cushion 11.

[0045] Next, the layer structure of the cushion will be described. Fig. 6 is a cross-sectional view showing an example of the layer structure of the third cushion 31. As shown in Fig. 6, the third cushion 31 may include a first layer 311 and a second layer 312. The first layer 311 forms the upper surface of the third cushion 31.

[0046] The density of the resin threads 50 in the second layer 312 may be different from the density of the resin threads 50 in the first layer 311. For example, the density of the resin threads 50 in the second layer 312 may be greater than the density of the resin threads 50 in the first layer 311. In this case, the first layer 311 can function as an adjust layer that has low resilience and wraps around the body, and the second layer 312 can function as an active layer that has high resilience and supports turning over in bed.

[0047] The third cushion 31 may include a third layer 313 located below the second layer 312. The density of the resin threads 50 in the third layer 313 may be different from the density of the resin threads 50 in the second layer 312. For example, the density of the resin threads 50 in the third layer 313 may be greater than the density of the resin threads 50 in the second layer 312.

[0048] When the density of the first layer 311 is different from the density of the second layer 312, the density of the resin thread 50 at the boundary between the first layer 311 and the second layer 312 may change gradually. For example, when the density of the second layer 312 is greater than the density of the first layer 311, the density at the boundary may increase gradually from the first layer 311 side toward the second layer 312 side. This prevents the density of the resin thread 50 from changing suddenly at the boundary between the first layer 311 and the second layer 312. The boundary between the second layer 312 and the third layer 313 may be configured in a similar manner.

[0049] Like the third cushion 31, the second cushion 21 may also include a first layer 211, a second layer 212, and a third layer 213. The characteristics such as density of the first layer 211, the second layer 212, and the third layer 213 are similar to the characteristics of the first layer 311, the second layer 312, and the third layer 313 of the third cushion 31, and therefore a description thereof will be omitted.

[0050] Although not shown, the first cushion 11 may also include a first layer, a second layer, and a third layer, similar to the third cushion 31. The characteristics such as density of the first layer, second layer, and third layer of the first cushion 11 are similar to the characteristics of the first layer 311, second layer 312, and third layer 313 of the third cushion 31, and therefore a description thereof will be omitted.

[0051] As shown in Fig. 6, the corner 304 may be located in the first layer 311. In this case, the shape of the corner 304 is realized, for example, by molding the first layer 311 using a mold having a shape corresponding to the corner 304. Although not shown, the corner 304 may extend across both the first layer 311 and the second layer 312. In this embodiment, the third cushion 31 is independent from the second cushion 21, so that it is easy to adjust the shape of the third cushion 31, such as the corner 304.

[0052] (Effects of this embodiment) In this embodiment, the height T3 of the third cushion 31 is greater than the height T2 of the second cushion 21. This allows the position of a person's toes to be elevated. This improves the circulation of blood and lymph compared to when the height T3 is the same as the height T2. Furthermore, the corners 304 of the third cushion 31 are chamfered, which prevents the corners 304 from compressing the legs. This also improves the circulation of blood and lymph compared to when the corners 304 are sharp. These features relax the person's body and mind, thereby improving the quality of sleep.

[0053] It should be noted that various modifications can be made to the above-described embodiment. Below, modifications will be described with reference to the drawings as necessary. In the following description and the drawings used in the following description, parts that can be configured similarly to the above-described embodiment will be designated by the same reference numerals as those used for the corresponding parts in the above-described embodiment, and duplicated explanations will be omitted. Furthermore, if it is clear that the effects obtained in the above-described embodiment can also be obtained in the modified embodiment, the explanations thereof may be omitted.

[0054] (First Modification) In the above-described embodiment, an example has been shown in which the hardness of the first cushion 11 of the first portion 10 is constant in the width direction D2. However, this is not limited to this, and the hardness of the first cushion 11 of the first portion 10 may vary depending on the position in the width direction D2. Figure 7 is a plan view showing a first modified example of the mattress 1.

[0055] In the example shown in FIG. 7, the first cushion 11 of the first part 10 includes a central region 13 and side regions 14. The side regions 14 are located on both sides of the central region 13. The side regions 14 have a different hardness from the central region 13. For example, the hardness of the side regions 14 is greater than the hardness of the central region 13. This allows the position of the shoulders to be raised.

[0056] When the shoulders are low, the weight of the arms can cause the pectoral muscles to stretch and become tense. The example shown in Figure 7 can relieve tension in the pectoral muscles, allowing the person's body and mind to relax.

[0057] 7, the first cushion 11 of the first part 10 may include end regions 15 located outside the side regions 14 as viewed from the central region 13. The hardness of the end regions 15 may be greater than the hardness of the central region 13 and the hardness of the side regions 14.

[0058] The hardnesses of the central region 13, the side regions 14, and the end regions 15 are referred to as an eleventh hardness H11, a twelfth hardness H12, and a thirteenth hardness H13, respectively. The twelfth hardness H12 may be 10% or more larger than the eleventh hardness H11, 15% or more larger, or 20% or more larger. The thirteenth hardness H13 may be 20% or more larger than the eleventh hardness H11, 30% or more larger, or 40% or more larger.

[0059] The dimensions of the central region 13 and the side regions 14 in the width direction D2 are determined, for example, so that a person's two shoulders are located in the two side regions 14, respectively. The dimension of the central region 13 in the width direction D2 is, for example, 230 mm or more, and may be 240 mm or more. The dimension of the central region 13 in the width direction D2 is, for example, 320 mm or less, and may be 310 mm or less. The dimension of the side regions 14 in the width direction D2 is, for example, 90 mm or more.

[0060] However, if the dimension D of the pressure plate of the hardness measuring device is larger than the dimension of the central region 13 in the width direction D2, the pressure plate overlaps both the central region 13 and the side region 14. This may prevent the hardness of the central region 13 from being measured independently. In this case, as shown in FIG. 8, the hardness of the first portion 10 may be measured at multiple positions along the width direction D2 using a pressure plate 61. This allows the force applied to the pressure plate, i.e., the hardness of the first cushion 11, to be calculated at each position along the width direction D2, as shown in the graph in FIG. 8. If the hardness of the side region 14 is greater than that of the central region 13, the graph of the force measurement points will show a minimum value in the central region 13, as shown in FIG. 8. The measurement interval P in the width direction D2 is, for example, 50 mm.

[0061] The hardness of the second cushion 21 of the second portion 20 may be constant in the width direction D2, or may vary depending on the position in the width direction D2, similar to the hardness of the first cushion 11 of the first portion 10.

[0062] The hardness of the third cushion 31 of the third portion 30 may be constant in the width direction D2, or may vary depending on the position in the width direction D2, similar to the first cushion 11 of the first portion 10.

[0063] (Second Modification) Fig. 9 is a plan view showing a second modified example of the mattress 1. The mattress 1 may be one that can be used by two people. In this case, as shown in Fig. 9, the first cushion 11 of the first part 10 may include two central regions 13. Side regions 14 are provided on both sides of each central region 13. End regions 15 may be provided at the side edges 5.

[0064] (Third Modification) Fig. 10 is a plan view showing a third modified example of the mattress 1. The mattress 1 may be one that can be used by three people. In this case, as shown in Fig. 10, the first cushion 11 of the first part 10 may include three central regions 13. Side regions 14 are provided on both sides of each central region 13. End regions 15 may be provided at the side edges 5.

[0065] (Fourth Modification) In the above-described embodiment, an example has been shown in which the corners 304 of the third cushion 31 are curved. However, this is not limited to this, and the corners 304 may be flat as shown in Fig. 11. Even in this case, by chamfering the corners 304, it is possible to prevent the corners 304 from pressing against the legs.

[0066] Although several modifications of the above-described embodiment have been described, it is of course possible to combine a plurality of modifications as appropriate. [Example]

[0067] Next, the present invention will be explained in more detail with reference to examples. However, the present invention is not limited to the following examples as long as it does not depart from the gist of the present invention.

[0068] Example 1 A mattress 1 shown in Figure 7 was prepared. The properties of the main components of the mattress 1 are as follows: Height T1 of the first portion 10 and height T2 of the second portion 20: 50 mm Height of third part 30 T3: 90mm The radius of curvature of the corner 304 of the third part 30: 40 mm Hardness H2 of the second cushion 21: +30% compared to hardness H11 of the central region 13 Hardness H3 of the third cushion 31: -20% compared to hardness H11 of the central region 13 Hardness H12 in the side area 14: +20% compared to hardness H11 in the central area 13 Hardness H13 in the edge area 15: +40% compared to hardness H11 in the central area 13

[0069] Example 2 The mattress 1 of Example 1 and a pillow were prepared.

[0070] (Comparative Example 1) A urethane mattress was prepared.

[0071] (Comparative Example 2) I prepared a duvet.

[0072] (Comparative Example 3) A mattress identical to that in Example 1 was prepared, except that the height T3 of the third portion 30 was the same as the height T1 of the first portion 10 and the height T2 of the second portion 20.

[0073] [Evaluation of the amount of sinking] The amount of sinking when a person lay down was measured for Examples 1 and 2 and Comparative Examples 1 and 2. The results are shown in Figure 12. The amount of sinking for mattress 1 of Example 1 was generally smaller than that for the urethane mattress of Comparative Example 1 and the down comforter of Comparative Example 2.

[0074] [Evaluation of blood flow] The amount of blood flow was measured for a person lying down and sleeping in Example 1 and Comparative Examples 1 and 3. The results are shown in Figure 13. The amount of blood flow in mattress 1 of Example 1 was greater than in Comparative Examples 1 and 3.

[0075] [Evaluation of relaxation level] In Example 1 and Comparative Examples 1 and 3, the brain waves of people lying down and asleep were measured. The content of alpha waves in the brain waves was also calculated. It is said that the higher the content of alpha waves, the higher the degree of relaxation. The results are shown in Figure 14. The content of alpha waves in the mattress 1 of Example 1 was higher than in Comparative Examples 1 and 3.

[0076] In Example 1 and Comparative Examples 1 and 3, electrocardiograms were measured for people lying down and asleep. LLF / HF is an index of sympathetic nerve activity. It is said that the smaller the LF / HF, the higher the degree of relaxation. The results are shown in Figure 15. The LF / HF for Mattress 1 of Example 1 was smaller than those for Comparative Examples 1 and 3.

[0077] [Evaluation of body pressure distribution] In Example 1 and Comparative Examples 1 and 2, the distribution of body pressure applied to a person in a recumbent position was measured. The results are shown in Figure 16. As shown in Figure 16, in Comparative Examples 1 and 2, a body pressure of 8.0 kPa or more was applied to the lower back. On the other hand, in Example 1, the maximum withstand pressure applied to the lower back was within the range of 6.0 kPa or more and less than 7.0 kPa. [Explanation of symbols]

[0078] 1 mattress 3 1st end 4 2nd end 5 side edge 10 Part 1 11 First Cushion 12 First Cover 13 Central area 14 Side Area 15 Edge area 20 Part 2 21 Second Cushion 22 Second Cover 30 Part 3 301 Top surface 302 Bottom surface 303 Wall 304 Corner 31 Third Cushion 311 1st layer 312 2nd layer 313 3rd layer 32 Third Cover 41 First connection part 42 Second connection part 50 Thread-like Resin 51 Contact part 52 void 61 Pressure Plate

Claims

1. A mattress for supporting a person in a recumbent position, comprising: a first portion including a first cushion for supporting the person's head; a second portion adjacent to the first portion and including a second cushion for supporting the person's lower back; a third portion adjacent to the second portion and including a third cushion for supporting the person's legs; The second portion includes an upper surface (201), a lower surface (202) parallel to the upper surface (201), and a wall surface (203); The third portion includes an upper surface (301), a lower surface (302) parallel to the upper surface (301), a wall surface (303) facing the wall surface (203) of the second portion and extending in a height direction, and a corner (304) located between the wall surface (303) and the upper surface (301); a height of the third cushion in the third portion is greater than a height of the first cushion in the first portion and a height of the second cushion in the second portion; the corner (304) is at least partially located above the top surface (201) of the second portion; A mattress, wherein the first cushion of the first portion, the second cushion of the second portion, and the third cushion of the third portion are made of a plurality of intertwined resin threads.

2. 2. The mattress of claim 1, wherein the cushion height of the third portion is at least 20 mm greater than the cushion height of the second portion.

3. the mattress includes a first end that is an end located near the person's head and a second end that is an end located near the person's legs; 3. The mattress of claim 1 or 2, wherein the third portion extends to the second end.

4. A mattress as described in any one of claims 1 to 3, wherein the corners (304) are chamfered.

5. the third cushion of the third portion includes a first layer and a second layer positioned below the first layer; 5. The mattress of claim 4, wherein the first layer of the third cushion includes the corner (304) and a wall surface facing the wall surface (203) of the second portion.

6. 6. The mattress of claim 4, wherein the corners have a chamfer dimension of 20 mm or more.

7. 7. A mattress according to any one of claims 4 to 6, wherein the corners are curved.

8. a first cushion of the first portion having a first hardness; the second cushion of the second portion has a second hardness that is 15% or more greater than the first hardness; The mattress of claim 1 , wherein the third cushion of the third portion has a third hardness that is at least 10% less than the first hardness.

9. the density of the resin thread in the second portion is greater than the density of the resin thread in the first portion; 9. The mattress of claim 1, wherein the density of the resin threads in the third portion is lower than the density of the resin threads in the first portion.

10. the third cushion of the third portion includes a first layer and a second layer positioned below the first layer; 10. The mattress of claim 9, wherein the density of the resin threads in the second layer is greater than the density of the resin threads in the first layer.

11. The first cushion of the first portion includes a central region and side regions located on both sides of the central region, 11. A mattress according to any preceding claim, wherein the side regions have a firmness greater than the firmness of the central region.

12. A mattress described in any one of claims 1 to 11, wherein the height of the first cushion in the first part is the same as or greater than the height of the second cushion in the second part.

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