Mattress

Abstract

To provide a mattress in which array positions of mattress parts can be changed.SOLUTION: A mattress 3 includes a plurality of rectangular parallelepiped mattress parts 2. The mattress parts 2 have the same shape and can be arrayed in a first direction being a height direction of a user. In the mattress parts 2, a first region 11 is formed in a predetermined range in the first direction. A second region 12 is formed adjacent to the first region 11. The first region 11 has a displacement amount when a load is applied smaller than that of the second region 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a mattress that uses a plurality of separated mattress parts that are connected together. [Background technology]

[0002] Mattresses using a series of mattress parts each divided into several sections have been proposed. For example, the mattress described in Patent Document 1 is divided into a head support section that supports the user's head, a lumbar support section that supports the user's lower back, and a leg support section that supports the user's legs, and it is desirable that the wave shapes of the wave parts in at least the lumbar support section differ from those in the head support section or the leg support section. For example, since a larger load is applied to the lumbar support section than to the head support section or the leg support section, it is conceivable to make the wave shape of the wave part in the lumbar support section larger than that of the head support section or the leg support section so that the lumbar support section can withstand a larger load.

[0003] The mattress has a recess formed along the longitudinal direction in its natural state, the width dimension of the recess is such that a user can assume a recumbent position within the recess, and the inner surface of the recess has an inclined portion that presses against the back of the user in a recumbent position, thereby assisting the user in the recumbent position.

[0004] According to this, when a user assumes a recumbent position within the recess, the inclined portion formed on the inner surface of the recess abuts against the back of the user in the recumbent position, thereby assisting the user in the recumbent position, making it easier to maintain the recumbent sleeping position. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-46841 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the mattress described in Patent Document 1 is expected to have the following problems. The mattress is divided into a head support section that supports the user's head, a lumbar support section that supports the lumbar region, and a leg support section that supports the legs. The wave shapes of the waves in at least the lumbar support section are different from those in the head support section or the leg support section. In particular, since a greater load is applied to the lumbar support section than to the head support section or the leg support section, the wave shape of the waves in the lumbar support section, particularly within the recess, is made larger to withstand the greater load than the head support section or the leg support section. In other words, since the lumbar support section receives the greatest load of all three support sections of the mattress, the mattress is prone to sagging and deteriorates quickly. Furthermore, while rotating the positions of the mattress parts is considered to prevent deterioration, the mattress described in Patent Document 1 was not possible because the shapes of the parts differ depending on the section.

[0007] SUMMARY OF THE INVENTION An object of the present invention is to provide a mattress in which the arrangement positions of mattress parts can be changed. [Means for solving the problem]

[0008] A mattress according to a first aspect of the present invention comprises a plurality of rectangular mattress parts, which are identical in shape to one another and can be arranged in a first direction which is the height direction of the user, and in the first direction, a first region is formed within a predetermined range, and a second region is formed adjacent to the first region, and the first region has a smaller displacement when a load is applied than the second region.

[0009] According to this, when the mattress parts are arranged in a first direction, a first region and a second region having a difference in the amount of displacement when a load is applied can be formed. Therefore, a user can lie on the mattress in a position where the difference in the amount of displacement is formed, and can obtain a good feeling of use. In addition, the multiple mattress parts have the same shape. Therefore, the arrangement positions can be interchanged for use.

[0010] Furthermore, the mattress may have the first region formed at the end of the mattress part. In this case, the first region of the mattress part is formed at the end in the first direction, so that the mattress user can lie down knowing that the connecting portion of the mattress parts is the first region. Furthermore, regardless of the arrangement direction of the mattress parts, the end in the first direction of the mattress is the first region.

[0011] The mattress according to the second aspect of the present invention is made up of three identical mattress parts, and comprises a first region and a second region adjacent to the first region that undergoes a greater amount of displacement when a load is applied than the first region, and has a length of 150 to 400 mm in a first direction, which is the direction of the user's height.

[0012] According to this, when the three mattress parts are arranged, the length of the first region in the first direction is 150 to 400 mm, so the user can lie down with the first region positioned between the user's armpit and the anterior superior iliac spine. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view of a mattress 3 according to an embodiment of the present invention, showing a mattress 31a of a first embodiment as a representative example. [Figure 2] 1A is a view from the A direction in FIG. 1, showing the respective configurations of the mattress parts 21a to 22c. [Figure 3] This is a diagram summarizing the height, axillary height Lm, anterior superior iliac spine height Ln, specific length Ls, and length of the first region 11 for men and women based on statistical data. [Figure 4] 1A and 1B are views from the direction A in FIG. 1 showing the second direction groove portion 4, where (a) shows the mattress part 21a of the mattress 31a of the first embodiment, and (b) shows the mattress part 22a of the mattress 32a. [Figure 5]10(a) shows a mattress 31a of the first embodiment, and FIG. 10(b) shows a mattress 32a of the first embodiment, showing examples of correspondence between the body parts of an average-height male M1 and an average-height female F1 who are users. [Figure 6] 10 shows a mattress 31b of a second embodiment, where (a) shows a first example, (b) shows a second example, and (c) shows a third example. [Figure 7] 10 shows a mattress 31c of a third embodiment, where (a) shows a first example, (b) shows a second example, (c) shows a third example, and (d) shows a fourth example. DETAILED DESCRIPTION OF THE INVENTION

[0014] A mattress 3 embodying the present invention will be described below with reference to the drawings. Note that the detailed description of the invention and the drawings are used to explain technical features that may be adopted by the present invention. The present invention is not limited thereto. The configurations shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0015] <<Configuration common to each embodiment of the mattress 3>> A description will now be given of the configuration common to all embodiments of the mattress 3 according to this aspect of the present invention. As shown in FIG. 1, the mattress 3 according to this aspect of the present invention comprises a plurality of rectangular parallelepiped mattress parts 2. The mattress parts 2 have the same shape and can be arranged in a first direction, which is the direction of the user's height. The direction perpendicular to the first direction is defined as a second direction. The mattress parts 2 have a length Lp in the first direction, a length W in the second direction, and a thickness H in the thickness direction.

[0016] In the example shown in FIG. 1, the mattress 3 has three mattress parts 2 arranged in the first direction. In addition to the example shown in FIG. 1, the mattress 3 may have two or four or more mattress parts 2 arranged. The mattress parts 2 have connecting parts 8 at their ends in the first direction. When the mattress parts 2 are arranged in the first direction, they may simply be lined up, or they may be attached and detached using connecting members such as hook-and-loop fasteners attached to the connecting parts 8 for connection. Each mattress part 2 is arrangable in the first direction and is separable from one another. Although not shown, the mattress 3 may also have the mattress parts 2 arranged in a cover.

[0017] As shown in FIG. 2 and other figures, the mattress part 2 has a first region 11 formed within a predetermined range in the first direction. A second region 12 is formed adjacent to the first region 11, and the first region 11 has a smaller displacement amount when a load is applied than the second region 12. Note that the first region 11 does not necessarily have to have a smaller displacement amount when a load is applied than the second region 12 across the entire range. Even if the displacement amounts are partially reversed, it is sufficient that the first region 11 has a smaller displacement amount than the second region 12 when the average displacement amounts over the entire regions are compared. In the mattress part 2, the displacement amount of the second region 12 is set first, and then the displacement amount of the first region 11 is set. Specifically, as shown in FIG. 5, the displacement amount of the second region 12 that supports the buttocks when the mattress parts 2 are arranged as a mattress 3 is first set. The displacement amount of the second region 12 is set in various ways depending on the application of the mattress 3. Next, the displacement amount of the first region 11 that supports the lumbar region is set to be smaller than that of the second region 12 that supports the buttocks. The difference in displacement between the first region 11 and the second region 12 is, for example, 3 to 50 mm in terms of the difference in sinking amount when a spherical object with a diameter of 216 mm and a mass of 6.55 kg is placed on it.

[0018] Furthermore, the mattress part 2 may further have a third region 13 formed therein, as shown in FIG. 2 and other figures. The third region 13 is disposed adjacent to the second region 12 in the first direction. The first region 11, the second region 12, and the third region 13 are formed in a strip shape along the second direction within a predetermined range in the first direction, as shown in FIG. 1. In the following explanation, an example will be shown in which the first region 11 to the third region 13 are formed by second direction groove portions 4 formed from the front side, as will be described later. The magnitude relationship of the displacement amounts from the first region 11 to the third region 13 satisfies the relationship: first region 11 < third region 13 < second region 12. In addition to forming the second direction groove portions 4, the first region 11 to the third region 13 may be formed from materials that have different displacement amounts when a load is applied.

[0019] <<Effects common to all embodiments of Mattress 3>> The configuration common to all embodiments of the mattress 3 described above provides the following advantages. As illustrated in FIG. 5, when the mattress parts 2 of the mattress 3 are arranged in a first direction, a first region 11 and a second region 12 can be formed, each having a different amount of displacement when a load is applied. Therefore, a user can enjoy a comfortable feeling when lying on the mattress 3 in a position where a difference in the amount of displacement when a load is applied is formed. Furthermore, the multiple mattress parts 2 have the same shape. Therefore, they can be used by interchangeably arranging them. Furthermore, as illustrated in FIG. 5, the amount of displacement of the first region 11, which supports the lower back, is made smaller than that of the second region 12, which supports the buttocks, thereby enabling the user's body to be properly supported.

[0020] Furthermore, if a third region 13 is further formed in the mattress part 2, regions with different amounts of displacement when a load is applied are formed from the first region 11 to the third region 13. Therefore, the amount of displacement when a load is applied to the mattress part 2 is formed in three stages, so the user of the mattress 3 can get a better feel by lying down in a position where the difference in the amount of displacement is formed. Furthermore, the third region 13 is adjacent to the second region 12 in the first direction. Therefore, the amount of displacement when a load is applied changes gradually without changing drastically, so the user does not feel uncomfortable when lying down due to the difference in the amount of displacement.

[0021] << Mattress Part 2 Composition and Effects >> Next, the detailed configuration and effects of the mattress part 2 in the mattress 3 according to this embodiment of the present invention will be described. In the mattress part 2, the first region 11 may be formed from at least one end in the first direction, or the first region 11 may be formed in an area excluding both ends in the first direction.

[0022] This section describes a case where the first region 11 of the mattress part 2 is formed from at least one end in the first direction. FIG. 2 shows an example of the arrangement of the first region 11 to the third region 13 of the mattress part 2. In the illustration, the region with grid-like hatching is the first region 11, the region without hatching is the second region 12, and the region with diagonal grid-like hatching is the third region 13. The same applies to FIG. 4 and subsequent figures. Mattress part 21a in FIG. 2(a) to mattress part 21c in FIG. 2(c) show cases where the first region 11 and the second region 12 are provided. Mattress part 22a in FIG. 2(d) to mattress part 22c in FIG. 2(f) show cases where the first region 11 to the third region 13 are provided.

[0023] 2, the horizontally arranged first regions 11 in Figures 2(a) and 2(d), 2(b) and 2(e), and 2(c) and 2(f) have the same arrangement of the first regions 11. The first to fourth arrangements of the first regions 11 will be described below. The mattress part 2 may have each of the arrangement configurations described below individually, or may have a combination of multiple configurations.

[0024] <Explanation and effect of the first configuration> A first configuration of the mattress part 2 of the mattress 3 will now be described. In the first configuration, the first region 11 of the mattress part 2 is formed at the end in the first direction. This applies to all mattress parts 2 shown in Figure 2. In this case, the first region 11 of the mattress part 2 is formed at the end in the first direction, so a user of the mattress 3 can lie down knowing that the connecting portion 8 of the mattress part 2 is the first region 11.

[0025] <Explanation and effect of the second structure> A second configuration of the mattress part 2 in the mattress 3 will be described. In the second configuration, the first region 11 of the mattress part 2 is formed over a similar range from both ends in the first direction. This corresponds to the mattress part 21a shown in FIG. 2(a) and the mattress part 22a shown in FIG. 2(d). In this case, the mattress part 2 has the first region 11 formed over a similar range from both ends in the first direction, so the user can lie down knowing that the connecting portion 8 of the mattress part 2 is an area that will undergo a small amount of displacement when a load is applied. Furthermore, because the position of the first region 11 of the mattress part 2 is the same regardless of the arrangement direction of the connecting portion 8, the mattress part 2 can be easily rearranged.

[0026] <Explanation and effect of the third structure> A third configuration of the mattress part 2 in the mattress 3 will now be described. In the third configuration, the first region 11 of the mattress part 2 is formed from only one end in the first direction. This corresponds to the mattress part 21b shown in Figure 2(b) and the mattress part 22b shown in Figure 2(e). In this case, since the first region 11 of the mattress part 2 is formed from only one end in the first direction, the position of the first region 11 can be changed depending on the arrangement direction of the end.

[0027] <Explanation and effects of the fourth structure> A fourth configuration of mattress part 2 in mattress 3 will be described. In the fourth configuration, first regions 11 of mattress part 2 are formed from both ends in the first direction, and one first region 11 is formed over a longer range than the other first region 11. This corresponds to mattress part 21c shown in FIG. 2(c) and mattress part 22c shown in FIG. 2(f), where the length of one first region 11 is Lc1 and the length of the other first region 11 is Lc2. In this case, the length of the first region 11 in the first direction of mattress part 2 can be changed depending on the arrangement direction at connection portion 8.

[0028] Next, a description will be given of the case where the first region 11 of the mattress part 2 is formed in a region excluding both ends in the first direction. Although not shown, the arrangement configurations of the first region 11 from the fifth configuration to the seventh configuration will be described.

[0029] <Explanation and effects of the fifth structure> A fifth configuration of the mattress part 2 of the mattress 3 will now be described. The mattress part 2 has a first region 11 formed in an area excluding both ends in the first direction. In this case, the first region 11 of the mattress 3 is formed in a portion other than the connecting portion 8, so when a user lies down and a load is applied to the connecting portion 8, the amount of displacement increases.

[0030] <Explanation and effects of the sixth structure> A sixth configuration of the mattress part 2 of the mattress 3 will now be described. The mattress part 2 has a first region 11 formed in an area excluding both ends in the first direction, and is formed symmetrically with respect to the center line C1 in the first direction. In this case, the mattress 3 has the first region 11 formed in a portion other than the connecting portion 8, and remains in the same position even if the arrangement direction of the connecting portion 8 is changed. When a user lies down, the amount of displacement when a load is applied at the connecting portion 8 becomes large, and the amount of displacement becomes small around the center line C1 in the first direction.

[0031] <Explanation and effect of the seventh structure> A seventh configuration of the mattress part 2 of the mattress 3 will now be described. The mattress part 2 has a different distance in the first direction from one end to the first region 11 than the distance from the other end to the first region 11. In this case, the mattress 3 can change the position of the first region 11 depending on the arrangement direction of the mattress parts 2 at the connecting portion 8.

[0032] <Configuration of grooves in mattress part 2> Next, the configuration of the grooves in the mattress part 2 will be described. The mattress part 2 has second direction grooves 4 formed in it from the front side to the back side in the thickness direction along a second direction that is perpendicular to the first direction. The first region 11, the second region 12, and the third region 13 are formed by the second direction grooves 4. As shown in FIG. 4 , some of the second direction grooves 4 formed in the first region 11 are shallower than the second direction grooves 4 formed in the second region 12.

[0033] The mattress parts 21a and 22a will be used as examples for the following description. The second direction groove portion 4 of the mattress part 21a will be described with reference to FIG. 4(a). The first region 11 has a convex portion sandwiched between a first groove 41 having a depth d1 from the front side and a second groove 42 having a depth d2. The second region 12 has a convex portion sandwiched between third grooves 43 having a depth d3. The third grooves 43 are formed at approximately equal intervals in the first direction. The convex portion in the first region 11 is formed shallower from the front side than the convex portion in the second region 12, and is therefore less likely to deform. Therefore, the first region 11 deforms less than the second region 12 when a load is applied.

[0034] Referring to Figure 4(b), the second direction groove portion 4 of the mattress part 22a will be described. The first region 11 is similar to the mattress part 21a. The second direction groove portion 4 formed in the second region 12 includes a third groove 43 with a depth d3 and a fourth groove 44 with a depth d4. The third region 13 is formed by the third groove 43 with a depth d3. The second region 12 includes second direction groove portions 4 formed in the third region 13 that are deeper than the depth d3. The first groove 41 to the fourth groove 44 increase in depth in the thickness direction. The second region 12 forms a convex shape by the fourth grooves 44 at both ends and the third groove 43 between them. The convex shape in the second region 12 is more easily deformed as a single unit than the convex shape in the third region 13 due to the fourth groove 44 formed from the front side to its deepest point. Therefore, the second region 12 displaces more when a load is applied than the third region 13. That is, the magnitude relationship of the displacement amounts from the first region 11 to the third region 13 is first region 11 < third region 13 < second region 12. The configuration in which the first region 11 to the third region 13 are formed by the second direction groove portion 4 is similar to the other embodiments.

[0035] Furthermore, first direction grooves are formed along a first direction from the front side to the back side in the thickness direction of the mattress part 2. The depth g1 of the first direction grooves is greater than the depths d1 and d2 of the second direction grooves 4 in the first region 11.

[0036] <Effects of the groove configuration of mattress part 2> The groove configuration of the mattress part 2 described above has the following effects. As shown in Fig. 4, some of the second direction grooves 4 formed in the first region 11 are shallower than the second direction grooves 4 formed in the second region 12. Therefore, the amount of displacement when a load is applied can be adjusted by changing the depth of the second direction grooves 4, so the first region 11 can be formed with a smaller amount of displacement than the second region 12.

[0037] 4(b), the second direction grooves 4 formed in the third region 13 include those with a depth between the depth of the second direction grooves 4 formed in the first region 11 and the depth of the second direction grooves 4 formed in the second region 12. Therefore, the amount of displacement when a load is applied can be adjusted by the depth of the second direction grooves 4, so that the amount of displacement in the third region 13 can be between that of the first region 11 and the second region 12.

[0038] <<Mattress 3 Composition>> Next, the configuration and effects of a mattress 3 according to an embodiment of the present invention will be described. As shown in Fig. 1 and Figs. 5 to 7, the mattress 3 is made up of three mattress parts 2 of the same shape, and includes a first region 11 and a second region 12 that is subject to a larger amount of displacement when a load is applied than the first region 11. The mattress 3 has the first region 11 with a length L11 of 150 to 400 mm in a first direction, which is the direction of the user's height. The length L11 of the first region 11 in the first direction may vary depending on whether the first regions 11 of two mattress parts 2 are connected at the connecting portion 8, or whether the first region 11 is formed by a single mattress part 2. This will be explained in each embodiment described below.

[0039] As shown in Figure 2, the length of mattress part 2 in the first direction is Lp. Figure 3 is a diagram summarizing the heights, axillary height Lm, anterior superior iliac spine height Ln, specific length Ls, and length L11 of first region 11 for men and women based on statistical data. A man of average height is designated M1, a man of shortest height is designated M2, and a man of longest height is designated M3. A woman of average height is designated F1, a woman of shortest height is designated F2, and a woman of longest height is designated F3. Figure 3 is based on the human body dimension database of the Artificial Intelligence Research Center.

[0040] For example, when the mattress parts 2 of the mattress 3 are arranged in a first direction, the length L11 of at least one first region 11 that is continuous in the first direction ranges from 150 mm to 400 mm. The length L11 of this first region 11 is within the range of the specific length Ls, which is the difference between the axillary height Lm and the anterior superior iliac spine height Ln, when the user uses the mattress 3, or is substantially equal to the specific length Ls. Because the lumbar length of a person with a standard build is approximately 150 mm, the length L11 of the first region 11 is set to 150 mm or greater to support the lumbar vertebrae. Furthermore, as shown in FIG. 3, the specific length Ls of a man of maximum height M3 is the longest, at 365 mm.

[0041] The length L11 of the first region 11 in the first direction does not necessarily have to be limited to cases where the mattress parts 2 are arranged in the first direction. This includes cases where the length of the first region 11 in the first direction satisfies the requirements even when three mattress parts 2 are not arranged in the first direction. For example, the length L11 of one mattress part 2 in the first direction may range from 150 mm to 400 mm.

[0042] <<Effects of Mattress 3>> As described above, the mattress 3 according to this embodiment of the present invention is composed of three mattress parts 2 of the same shape, and the length L11 of at least one first region 11 continuing in the first direction is in the range of 150 mm to 400 mm. Since the length L11 in the first direction continuing to the first region 11 is 150 mm or more, the user's lumbar vertebrae are supported by the first region 11.

[0043] Furthermore, since the length L11 in the first direction continuous with the first region 11 is 400 mm or less, when used by a man M3 of maximum height, the distance between the armpit and the anterior superior iliac spine corresponds to the length of the first region 11. Therefore, when the user lies on the mattress 3, the amount of displacement when a load is applied between the armpit and the anterior superior iliac spine is smaller than that of the second region 12, resulting in a comfortable feel.

[0044] <<Explanation and Effects of Each Embodiment of Mattress 3>> <Description of Mattress 31a and Mattress 32a of First Embodiment> Next, the configuration and effects of each embodiment of the mattress 3 will be described. The mattress 3 described below is an example in which three identical mattress parts 2 are arranged in a first direction, which is the direction of the user's height. Mattress 31a and mattress 32a of the first embodiment will be described with reference to Figures 2, 4, and 5. Mattress 31a consists of three mattress parts 21a, and mattress 32a consists of three mattress parts 22a. Even if the arrangement direction of each mattress part 2 changes at the connecting portion 8, the position and length of the first region 11 in the first direction do not change in mattress 31a and mattress 32a. As already described with reference to Figures 2(a) and 2(d), mattress parts 21a and mattress parts 22a have a first configuration and a second configuration.

[0045] As shown in Figures 2(a) and 2(d), the first regions 11 are formed with a length La from both ends in the first direction. As shown in Figure 5, the length of the first regions 11 connected at the connecting portion 8 is L11a = 2 × La. The second regions 12 are arranged sandwiched between the first regions 11 in the first direction. Furthermore, as shown in Figure 2(d), the mattress part 22a has the second regions 12 and third regions 13 formed symmetrically about the center line C1.

[0046] Next, the relationship between the mattress 31a and the mattress 32a and the user's body parts will be described with reference to FIG. 5. FIG. 5(a) shows the mattress 31a, and FIG. 5(b) shows the mattress 32a. As shown in FIG. 5(a), when the mattress parts 21a are arranged in a first direction, adjacent mattress parts 21a are arranged so that their ends in the first direction form a connecting portion 8. The length L11a of the first region 11 that is connected across the connecting portion 8 is a constant 2×La, regardless of the orientation of the connecting portion 8 when arranged. The same applies to the mattress 32a shown in FIG. 5(b). This is because the mattress parts 21a and 22a have the first and second configurations already described.

[0047] FIG. 5 shows the correspondence between mattresses 31a and 32a and average-height men M1 and women F1. As shown in FIG. 3, the specific length Ls of the average-height men M1 is 328 mm, and the specific length Ls of the average-height women F1 is 330 mm. If La is 160 mm, then L11a is 320 mm, and the area between the axilla and the anterior superior iliac spine for the average-height men M1 and women F1 is the low-displacement first region 11. Furthermore, when the length Lp of mattress part 22a is 650 mm, the head and toes do not protrude from mattresses 31a and 32a. The length La of first region 11 in the first direction is set to a range of 75 to 200 mm, and the length L11a of the first region 11 connected across connection portion 8 is set to a range of 150 to 400 mm.

[0048] <Effects of the mattress 31a and the mattress 32a of the first embodiment> The mattress parts 21a and 22a of the first embodiment described above have the following advantages. As shown in FIG. 5 , the first-direction ends of the mattresses 31a and 32a form the first regions 11, regardless of the arrangement direction of the mattress parts 21a and 22a. When the mattress parts 21a and 22a are arranged in the first direction, the first-direction ends of adjacent mattress parts 21a and 22a are arranged as connecting portions 8, and the length L11a of the first regions 11 that are connected across the connecting portions 8 is constant, regardless of the arrangement direction of the mattress parts 21a and 22a. Therefore, users of the mattresses 31a and 32a can experience the same comfort before and after swapping or replacing them, because the first regions 11 are in a constant position regardless of the arrangement direction of the mattress parts 21a and 22a.

[0049] As shown in FIG. 5(b), the third region 13 is sandwiched between the first region 11 and the second region 12 in the first direction, and the amount of displacement when a load is applied changes stepwise in the region between the first region 11 and the first region 11. The amount of displacement when a load is applied to the mattress 32a changes periodically in the first direction from a small region to a large region and then to an even smaller region. Therefore, when the user positions the first region 11 connected to the connecting portion 8 between the axilla and the anterior superior iliac spine, the area around the neck and buttocks is supported by the second region 12 sandwiched between the two third regions 13, resulting in a comfortable feel. Note that the effects of including the first region 11 to the third region 13 are similar to those of the mattress 32b of the second embodiment and the mattress 32c of the third embodiment, and therefore will not be described here.

[0050] <Description of Mattress 31b and Mattress 32b of Second Embodiment> Next, mattresses 31b and 32b of the second embodiment will be described. As shown in Figures 2(b) and 2(e), mattress part 21b of mattress 31b and mattress part 22b of mattress 32b have first regions 11 formed only at one end in the first direction, which are the first and third configurations already described. In mattresses 31b and 32b, by changing the arrangement direction of each mattress part 2 at the connecting portion 8, the position of the first regions 11 in the first direction can be changed, and the length of the first regions 11 connected in the first direction can also be changed.

[0051] 2(b) and 2(e), the first region 11 is formed with a length of Lb from only one end in the first direction. As shown in FIG. 2(b), the region other than the first region 11 is the second region 12. Furthermore, as shown in FIG. 2(e), a third region 13 is formed in a region adjacent to the first region 11 and within a predetermined range from the other end, and the second region 12 is formed adjacent to and sandwiched between the third region 13.

[0052] Next, the configurations of mattress 31b and mattress 32b will be described. Note that the following description will focus on mattress 31b as a representative example, with reference to FIG. 6. Mattress 32b is not shown. As shown in FIG. 6(a), a first example is a case where all mattress parts 21b are arranged so that the first regions 11 are on the front side. In this case, the first regions 11 in the first direction have a length Lb. As shown in FIG. 6(b), a second example is a case where all mattress parts 21b are arranged so that the arrangement direction is reversed and the first regions 11 are on the rear side. In this case, the first regions 11 in the first direction also have a length Lb. The first and second examples differ in the position of the first regions 11 in the first direction. In both the first and second examples, the length Lb of the first regions 11 is set in the range of 150 to 400 m.

[0053] As shown in FIG. 6(c), in a third example, only the front mattress part 21b is arranged so that the first region 11 faces rearward, while the center and rear mattress parts 21b are arranged so that the first region 11 faces forward. In this case, the length L11b of the first regions 11 that are connected across the connecting portion 8 is 2×Lb2. The length Lb is set in the range of 75 to 200 mm, and the length L11b is set in the range of 150 to 400 mm. This is particularly suitable for users with a long distance between the axilla and the anterior superior iliac spine, such as a man of maximum height M3.

[0054] <Effects of the mattress 31b and the mattress 32b of the second embodiment> The configurations of the mattress 31b and mattress 32b of the second embodiment described above provide the following advantages: The position of the first region 11 of the mattress 31b and mattress 32b, or the length of the first region 11 that is connected across the connecting portion 8, can be changed by changing the arrangement direction of the connecting portion 8. Therefore, the position or length of the first region 11 of the mattress 31b and mattress 32b can be changed according to the height of the user or the purpose of use simply by changing the arrangement direction of the mattress parts 21b and mattress parts 22b, respectively.

[0055] <Mattress 31c and mattress 32c of the third embodiment> Next, a mattress 31c and a mattress 32c according to a third embodiment will be described. As shown in Figures 2(c) and 2(f), the mattress part 21c in the mattress 31c and the mattress part 22c in the mattress 32c have the first and fourth configurations already described.

[0056] As shown in Figures 2(c) and 2(f), in mattress parts 21c and 22c, the first region 11 formed from one end in the first direction has a length Lc1, and the first region 11 formed from the other end has a length Lc2. Lc1 > Lc2. Also, as shown in Figure 2(c), the second region 12 is disposed between the first regions 11 in the first direction. Also, as shown in Figure 2(f), the second region 12 is formed adjacent to and sandwiched between the third region 13.

[0057] As shown in Figure 7, when the mattress parts 21c of mattress 31c are arranged in the first direction, the ends of adjacent mattress parts 21c in the first direction are arranged as first regions 11. In mattress 31c, the length of the first regions 11 connected in the first direction can be changed by changing the arrangement direction of each mattress part 2 at the connecting portion 8. The same applies to mattress 32c, and the following explanation will only be given for mattress 31c. Mattress 32c is not shown.

[0058] The length of the first region 11 will be described when the arrangement direction of the mattress parts 21c is changed. As shown in Fig. 7(a), in a first example, the first region 11 of each mattress part 21c with length Lc1 is arranged on the front side. In this case, the length L11c of the first region 11 connected at the front connecting portion 8 is Lc2 + Lc1.

[0059] As shown in Figure 7(b), in the second example, the first region 11 of each mattress part 21c with a length Lc1 is arranged on the rear side. In this case, the length L11c of the first region 11 connected to the front connecting portion 8 is Lc1 + Lc2. In this case, the length of the first region 11 in the first direction is the same as in the first example, but the position is shifted to the front.

[0060] 7(c), in the third example, the first region 11 of the front mattress part 21c with length Lc1 is arranged to face forward, the first region 11 of the central mattress part 21c with length Lc2 is arranged to face forward, and the first region 11 of the rear mattress part 21c with length Lc2 is arranged to face forward. In this case, the length L11c of the first region 11 connected at the front connecting portion 8 is 2×Lc2.

[0061] As shown in FIG. 7(d), in a fourth example, the first region 11 of the front mattress part 21c with length Lc2 is arranged to be on the front side, and the first region 11 of the central mattress part 21c with length Lc1 is arranged to be on the front side. In this case, the length of the first region 11 connected at the front connecting portion 8 is L11c = 2 × Lc1. As shown in the above four examples, the length of the first region 11 connected at the connecting portion 8 can be set to three types: the longest 2 × Lc1, the next longest Lc1 + Lc2, and the shortest 2 × Lc2. The three types of lengths are set in the range of 150 to 400 mm.

[0062] <Effects of the mattress 31c and the mattress 32c of the third embodiment> The configuration of the mattress 31c of the third embodiment described above provides the following advantages. The length of the first region 11 of the mattress 31c, which is connected across the connecting portion 8, can be changed by changing the arrangement direction of the mattress parts 21c at the connecting portion 8. Therefore, the length of the first region 11 of the mattress 31c can be changed according to the height of the user or the intended use by simply changing the arrangement direction of the mattress parts 21c, without having to prepare a new mattress part 2 of a different form. In other words, by changing the arrangement direction at the connecting portion 8, the mattress 31c can be used by users of different heights. The same applies to the mattress 32c. [Explanation of symbols]

[0063] 2, 21a, 21b, 21c, 22a, 22b, 22c Mattress parts 3, 31a, 31b, 31c, 32a, 32b, 32c マットレス 11 First Domain 12 Second Domain

Claims

1. It has multiple rectangular parallelepiped mattress parts, The mattress part is The devices have the same shape and can be arranged in a first direction, which is the height direction of the user; A first region is formed in a predetermined range in the first direction, and a second region is formed adjacent to the first region, The mattress has a smaller displacement when a load is applied to the first region than the second region.

2. 2. The mattress of claim 1, wherein the first region is formed at an end of the mattress part.

3. A mattress consisting of three identical mattress parts, A first region; a second region adjacent to the first region, the second region having a larger displacement amount when a load is applied than the first region; A mattress having the first region having a length of 150 to 400 mm in a first direction, which is the direction of the user's height.

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