WO2023021965A9

WO2023021965A9 - Cushion body

Info

Publication number: WO2023021965A9
Application number: PCT/JP2022/029339
Authority: WO
Inventors: 康行西川; 淳安川; 洋二志村; 秀暁茂木; 奨池田; 明彦川阪; 裕之永山; かんな松山; 将崇小笠原
Original assignee: 西川株式会社; 株式会社アーケム
Priority date: 2021-08-19
Filing date: 2022-07-29
Publication date: 2024-02-15
Also published as: WO2023021965A1; KR20240024254A; TW202312913A; JPWO2023021965A1; CN117794425A

Abstract

This cushion body has a long side that extends along the first direction and a short side that extends along a second direction perpendicular to the first direction, and which has a front surface turned vertically upwards and a back surface turned vertically downwards. The cushion body has: multiple protrusions which are arranged on the front surface in a lattice pattern along a first direction and a second direction; first front slits which extend in the first direction between two protrusions arranged along the second direction; and second front slits which extend in the second direction between two protrusions arranged along the first direction. The cushion body has multiple protrusion groups configured from multiple protrusions surrounded by two first front slits arranged in the second direction and two second front slits arranged in the first direction. The second front slits are at least at deep as the first front slits.

Description

cushion body

The present disclosure relates to a cushion body.
This application claims priority based on Japanese Application No. 2021-133944 dated August 19, 2021, and incorporates all the contents described in the said Japanese application.

Various types of cushion bodies have been known in the past. JP-A-2002-306285 describes a cushion body in which a front side elastic foam and a back side elastic foam are integrated. The cushion body has an uneven shape having protrusions formed on the front side and a planar shape formed on the back side.

The front side elastic foam has a plurality of first plate-like bodies facing the front side. The back side elastic foam has a plurality of second plate-like bodies facing the back side. The first plate-like body has three rows of protrusions arranged along the horizontal direction of the cushion body in a plan view. A gap extending in the vertical direction of the cushion body in a plan view is formed between the two first plate-like bodies arranged along the lateral direction of the cushion body in a plan view. The innermost part of the gap formed in the front elastic foam is a conduit portion having a diameter larger than the width of the gap.

A plurality of second plate-like bodies are lined up along the vertical direction of the cushion body in plan view. A gap extending along the lateral direction of the cushion body in a plan view is formed between the two second plate-like bodies arranged in the vertical direction in a plan view. The innermost part of the gap formed in the back side elastic foam is a conduit portion having a diameter larger than the width of the gap, as described above.

The cushion body has a plurality of gaps extending in the vertical direction of the cushion body in a plan view on the front side, and a plurality of gaps extending in the lateral direction of the cushion body in a plan view on the back side. The gap on the front side and the gap on the back side intersect each other. In this way, by providing intersecting gaps between the front side and the back side, the air permeability and cushioning properties are improved.

Japanese Patent Application Publication No. 2002-306285

The cushion body described above has a plurality of gaps extending in the vertical direction of the cushion body in a plan view on the front side, and a plurality of gaps extending in the lateral direction in a plan view of the cushion body on the back side. However, since the front side of the cushion body is the area on which the user's body is placed, further body pressure dispersion may be required.

It is known that the body pressure on the cushion body when sleeping on your back and the body pressure on the cushion body when sleeping on your side are different from each other. However, in the cushion body described above, only a plurality of gaps are formed on the front side that extend in the vertical direction in plan view. Therefore, there is room for improvement in terms of body pressure dispersion and turning over ability for both supine and side sleeping. Therefore, there is a need to develop a cushion body that is more versatile and can be adapted to more users while improving body pressure dispersion and turning ability.

An object of the present disclosure is to provide a cushion body that has high body pressure dispersion properties, easy turning over, and versatility.

A cushion body according to one aspect of the present disclosure has (1) a long side extending along a first direction and a short side extending along a second direction intersecting the first direction, and a surface facing vertically upward. , and a back surface facing vertically downward. The cushion body has a plurality of convex portions arranged in a lattice pattern along each of the first direction and the second direction on the surface, and a plurality of convex portions arranged in the first direction along the second direction. and a second front slit extending in the second direction between the two convex portions lined up along the first direction. The cushion body includes a plurality of convex portion groups constituted by a plurality of convex portions surrounded by two first front side slits lined up along the second direction and two second front side slits lined up along the first direction. has. The depth of the second front slit is less than or equal to the depth of the first front slit.

This cushion body includes a plurality of convex portions arranged in a grid pattern along each of the first direction and the second direction on the surface. A plurality of first front side slits extending in the first direction and a plurality of second front side slits extending in the second direction are formed on the surface. A convex group consisting of a plurality of convex portions is provided in a region surrounded by two first front side slits lined up along the second direction and two second front side slits lined up along the first direction. This cushion body includes a plurality of protrusion groups each including a plurality of protrusions. Since each convex group is provided in an area surrounded by the first front slit and the second front slit, when the user's body is placed on the surface, each convex group is deformed, not the entire cushion body. Can be done. That is, it becomes possible to deform only the convex portion group on which body pressure is applied in the cushion body. Since the cushion body can be deformed along the user's body and the area of contact between the body and the cushion body can be increased, body pressure dispersion can be improved. The depth of the second front slit is less than or equal to the depth of the first front slit. Since the depth of the second front slit extending in the second direction is less than or equal to the depth of the first front slit extending in the first direction, body pressure dispersion and rolling ability are achieved both when sleeping on your back and when sleeping on your side. can be increased. As a result, versatility can be increased to suit more users.

(2) In (1) above, the cushion body may have a lower layer forming the back surface, and the lower layer may be made of a harder material than the layers other than the lower layer. In this case, the lower layer can support the user's body more firmly, and the lower layer can disperse the high pressure from the shoulders of the user when sleeping on his or her side. Therefore, the sleeping position of the user can be maintained in the lower layer, and the sleeping comfort when sleeping on the side can be further improved.

(3) In (2) above, the lower layer may be made of a material that is lighter than the layers other than the lower layer. In this case, since the lower layer is made of a material that is harder and lighter than the other layers, it is possible to reduce the weight of the cushion body as a whole.

(4) In any of (1) to (3) above, the cushion body may have an upper layer including the top of the convex portion, and the upper layer is made of a material having higher elasticity than layers other than the upper layer. You can leave it there. In this case, since the upper layer is made of a highly elastic material, it is possible to improve the feel when the user touches the surface of the cushion body.

(5) In any of (1) to (4) above, the number of protrusions aligned along the first direction in the protrusion group, and the number of protrusions aligned along the second direction in the protrusion group, At least one of these may be 3 or more. In this case, three or more convex portions lined up in the first direction or three or more convex portions lined up in the second direction can be depressed at once by body pressure.

According to the present disclosure, it is possible to provide a cushioning material with high body pressure dispersion properties, ease of turning over, and versatility.

It is a perspective view showing a cushion body concerning an embodiment. FIG. 2 is an enlarged perspective view of a portion of the cushion body in FIG. 1; 2 is a plan view schematically showing the surface of the cushion body in FIG. 1. FIG. FIG. 2 is a bottom view schematically showing the back surface of the cushion body of FIG. 1. FIG. FIG. 2 is a side view showing the layered structure of the cushion body of FIG. 1 viewed from a second direction. FIG. 2 is a side view showing the layered structure of the cushion body of FIG. 1 viewed from a first direction. (a) is a diagram showing actual measurement data of body pressure when a cushion body according to a comparative example is lying on its back. (b) is a diagram showing actual measurement data of body pressure when the cushion body according to the example is lying on its back. (a) is a diagram showing actual measurement data of body pressure during side sleeping on a cushion body according to a comparative example. (b) is a diagram showing actual measurement data of body pressure when sleeping on the side of the cushion body according to the example. (a) is a diagram showing actual measurement data of the shape of a body placed on a cushion body according to a comparative example. (b) is a diagram showing actual measurement data of the shape of a body placed on a cushion body according to an example. It is a graph which shows the result of the experiment which verified sinking with respect to the cushion body based on an Example and a comparative example. (a), (b), and (c) are graphs showing the results of a ball rolling test performed on cushion bodies according to examples and comparative examples.

Hereinafter, embodiments of a cushion body according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are given the same reference numerals, and redundant description will be omitted as appropriate. For ease of understanding, some parts of the drawings may be simplified or exaggerated, and the dimensional ratios and the like are not limited to those shown in the drawings.

FIG. 1 is a perspective view showing a cushion body 1 according to the present embodiment. As shown in FIG. 1, the cushion body 1 has a rectangular shape having a plurality of long sides 1b extending in a first direction D1 and a plurality of short sides 1c extending in a second direction D2 intersecting the first direction D1. . The cushion body 1 has a thickness in a third direction D3 that intersects both the first direction D1 and the second direction D2.

The first direction D1 corresponds to the longitudinal direction of the cushion body 1, and the second direction D2 corresponds to the width direction of the cushion body 1. The third direction D3 corresponds to the height direction (thickness direction) of the cushion body 1. For example, the first direction D1, the second direction D2, and the third direction D3 are orthogonal to each other. As an example, the cushion body 1 is a core material of a mattress. For example, the cushion body 1 is used while being housed in a cover to prevent dirt.

For example, the cushion body 1 serves as a seat against which the user's back rests. The cushion body 1 is used as a cushion or bedding against which the user's body rests, and is used to improve cushioning properties and improve sitting or sleeping comfort. The cushion body 1 as a whole is made of a highly flexible material.

Therefore, when the user's body is placed on the cushion body 1, the cushion body 1 deforms with the load of the body. As an example, the cushion body 1 is made of urethane foam. The cushion body 1 has a front surface 2 facing vertically upward and a back surface 3 facing vertically downward.

The cushion body 1 includes a plurality of convex portions 4 formed on the surface 2. The plurality of convex portions 4 are formed so as to be lined up along the first direction D1 and also lined up along the second direction D2. The plurality of convex portions 4 are arranged in a grid pattern on the surface 2. For example, when viewed from the third direction D3 (in plan view), the convex portion 4 has a square shape.

The length of one side of the convex portion 4 when viewed from the third direction D3 is, for example, 2 cm or more and 5 cm or less (as an example, 3.0 cm or more and 3.5 cm or less). A portion between the pair of protrusions 4 is a recess 9 that is depressed relative to the pair of protrusions 4 . The cushion body 1 has a plurality of recesses 9, and the plurality of recesses 9 are arranged in a grid pattern on the surface 2.

FIG. 2 is an enlarged perspective view of a corner of the cushion body 1. As shown in FIGS. 1 and 2, the cushion body 1 has a first side surface 5 located at an end in the first direction D1 and a second side surface 6 located at an end in the second direction D2. The cushion body 1 has a pair of first side surfaces 5 and a pair of second side surfaces 6. The first side surface 5 extends in both the second direction D2 and the third direction D3, and the second side surface 6 extends in both the first direction D1 and the third direction D3.

The cushion body 1 has a first recess 7 formed on the first side 5 and a second recess 8 formed on the second side 6. The first recess 7 is recessed inside the cushion body 1 at the first side surface 5 (the center side of the cushion body 1 in plan view), and the second recess 8 is recessed inside the cushion body 1 at the second side surface 6. . For example, each of the first recess 7 and the second recess 8 has a curved surface.

The thickness T (length in the third direction D3) of the cushion body 1 is, for example, 4 cm or more and 14 cm or less. In this case, the cushion body 1 exhibits even more suitable cushioning properties. However, the thickness T may be 5 cm or more, 7 cm or more, or 9 cm or more, or may be 13 cm or less, 12 cm or less, or 10 cm or less. The thickness T may be a value other than the above and is not particularly limited.

FIG. 3 is a plan view of the cushion body 1 showing the surface 2. In FIG. 3, the convex portion 4 is schematically shown. As shown in FIGS. 2 and 3, the cushion body 1 has a first front slit 11 and a second front slit 12. As shown in FIGS. The first front side slit 11 extends in the first direction D1 between the two convex portions 4 lined up along the second direction D2. The second front side slit 12 extends in the second direction D2 between the two convex portions 4 lined up along the first direction D1.

The cushion body 1 has a plurality of first front side slits 11 and a plurality of second front side slits 12. The cushion body 1 has a plurality of convex portion groups G. The convex part group G is constituted by a plurality of convex parts 4 surrounded by two first front side slits 11 lined up along the second direction D2 and two second front side slits 12 lined up along the first direction D1. be done. In the convex group G, convex portions 4 and concave portions 9 are arranged in a grid pattern.

The plurality of protrusion groups G are arranged in a grid pattern on the surface 2. The plurality of convex portion groups G are arranged so as to be lined up along the first direction D1 and also lined up along the second direction D2. At least one of the number of protrusions 4 aligned along the first direction D1 in the protrusion group G and the number of protrusions 4 aligned along the second direction D2 in the protrusion group G is 3 or more.

FIG. 3 shows an example in which the number of protrusions 4 aligned along the first direction D1 in the protrusion group G and the number of protrusions 4 aligned along the second direction D2 in the protrusion group G are three. ing. In this case, in each convex group G, 3×3 (=9) convex portions 4 are arranged. However, the number of convex parts 4 in the convex part group G is not limited to the above example, and for example, 3 × 2 (= 6), 4 × 3 (= 12), or 4 × 4 ( = 16) convex parts 4 may be arranged in the convex part group G.

Each convex group G is provided inside a rectangular area defined by two first front slits 11 extending in the first direction D1 and two second front slits 12 extending in the second direction D2. Therefore, the cushion body 1 can be deformed for each convex group G according to the body pressure of the user placed on the surface 2. Therefore, the contact area of the user's body with the cushion body 1 can be increased, and the body pressure dispersion of the user's body can be improved.

FIG. 4 is a bottom view of the cushion body 1 showing the back surface 3. As shown in FIGS. 2 and 4, the cushion body 1 has a back side slit 13. For example, the cushion body 1 has a plurality of back side slits 13. The back side slit 13 extends along the second direction D2. The plurality of back side slits 13 are arranged so as to be lined up along the first direction D1.

FIG. 5 is a side view of the cushion body 1 viewed from the second direction D2 (the width direction of the cushion body 1, the lateral direction of the cushion body 1 in a plan view). FIG. 6 is a side view of the cushion body 1 viewed from the first direction D1 (the longitudinal direction of the cushion body 1, the vertical direction of the cushion body 1 in a plan view). As shown in FIGS. 5 and 6, the cushion body 1 includes an upper layer 21, a first intermediate layer 22, a second intermediate layer 23, and a lower layer 24. The upper layer 21 includes the top portion 4b of the convex portion 4. The first intermediate layer 22 is located below the upper layer 21 . The second intermediate layer 23 is located below the first intermediate layer 22. The lower layer 24 constitutes the back surface 3.

The cushion body 1 has a four-layer structure consisting of an upper layer 21, a first intermediate layer 22, a second intermediate layer 23, and a lower layer 24. For example, the material of the upper layer 21 is different from the material of the layers other than the upper layer 21 (first intermediate layer 22, second intermediate layer 23, and lower layer 24). The material of the lower layer 24 is different from the material of the layers other than the lower layer 24 (the upper layer 21, the first intermediate layer 22, and the second intermediate layer 23). The material of the first intermediate layer 22 may be the same as the material of the second intermediate layer 23, or may be different. The first intermediate layer 22 and the second intermediate layer 23 are made of, for example, urethane foam (urethane foam).

The upper layer 21 is a layer that includes the top portion 4b of the convex portion 4. For example, the shape of the upper layer 21 when viewed along the third direction D3 (in plan view) has a rectangular shape (a square shape, for example). The shape of the upper layer 21 viewed along the first direction D1 or the second direction D2 has, for example, a curved shape (for example, a parabolic shape or an arc shape). The shape of the upper layer 21 viewed along the first direction D1 or the second direction D2 may be an elliptical shape, and is not particularly limited.

The cushion body 1 has a plurality of upper layers 21, and the plurality of upper layers 21 are lined up along both the first direction D1 and the second direction D2. In the cushion body 1, the upper layer 21 is arranged in a grid pattern. The upper layer 21 is made of a material with higher elasticity than the layers other than the upper layer 21.

The upper layer 21 is a pressure-receiving layer that receives body pressure of the user. The upper layer 21 is made of, for example, a highly elastic material. As an example, the upper layer 21 is made of urethane foam (high resilience foam or high elasticity foam) having high resilience. For example, the rebound resilience of the upper layer 21 is 45% or more. However, the rebound resilience of the upper layer 21 is more preferably 50% or more, or 55% or more. The upper layer 21 is made of a material having higher impact resilience (higher repulsion) than the layers other than the upper layer 21 . The upper layer 21 may be made of Somniform (registered trademark). The hardness of the upper layer 21 is, for example, 100N or more and 210N or less (150N as an example). The 40% hardness of the upper layer 21 is, for example, 80N or more and 200N or less, and more preferably 100N or more and 180N or less.

The upper layer 21 may be made of a material that is softer than layers other than the upper layer 21. The upper layer 21 may be made of filmless urethane. In this case, the upper layer 21 can have good air permeability. However, from the viewpoint of odor reduction, the upper layer 21 made of a highly elastic material is more advantageous than the upper layer 21 made of filmless urethane. Furthermore, the upper layer 21 provides a good feel to the touch.

The first intermediate layer 22 is a layer located below the upper layer 21. The first intermediate layer 22 is a dispersion layer that disperses the body pressure of the user. For example, the 40% hardness of the first intermediate layer 22 is 160N or more and 330N or less. However, the 40% hardness of the first intermediate layer 22 may be 190N or more or 240N or more, or 250N or less or 280N or less. The rebound resilience of the first intermediate layer 22 is, for example, 35% or more. However, the rebound resilience of the first intermediate layer 22 is more preferably 45% or more. However, the hardness and impact resilience of the first intermediate layer 22 are not limited to the above example. The first intermediate layer 22 has a recess 9, a first front slit 11, and a second front slit 12. In addition to the recess 9, the first intermediate layer 22 has a first front slit 11 extending in the first direction D1 and a second front slit 12 extending in the second direction D2.

The cushion body 1 includes a plurality of first intermediate layers 22, and a group of protrusions G is formed on the upper part of each first intermediate layer 22. The position of the first intermediate layer 22 in a plan view is the same as the position of the protrusion group G in a plan view. Like the convex group G, the first intermediate layer 22 is arranged in a lattice shape in the cushion body 1 along each of the first direction D1 and the second direction D2. As a result, the plurality x plurality (for example, 3 x 3) of the convex parts 4 (convex part group G) are deformed independently. As a result, body pressure can be more efficiently distributed in each convex group G.

The depth H1 from the top 4b of the convex part 4 to the bottom of the recess 9 is the depth H2 from the top 4b to the bottom of the first front slit 11, and the depth H3 from the top 4b to the bottom of the second front slit 12. shallower than The depth H3 of the second front slit 12 is less than or equal to the depth H2 of the first front slit 11.

For example, the recess 9 has an arc shape between the lower ends of the pair of protrusions 4. The first front side slit 11 has a first portion 11b and an expanded portion 11c. The first portion 11b extends linearly in the third direction D3. The expanded portion 11c expands from the lower end of the first portion 11b so that the width of the first front slit 11 becomes wider. The extended portion 11c is curved, for example, in an arc shape. The expanded portion 11c allows the convex portion group G to be more easily deformed locally.

The second front slit 12 has, for example, a first portion 12b extending linearly in the third direction D3, and a width of the second front slit 12 from the lower end of the first portion 12b, similar to the first front slit 11 described above. It has an extension part 12c that expands to become. The first front slit 11 and the second front slit 12 have different depths as described above. The lower end of the second front side slit 12 reaches the first intermediate layer 22. The lower end of the first front side slit 11 reaches the second intermediate layer 23 below the first intermediate layer 22.

For example, the hardness of the lower layer 24 may be higher than the hardness of the first intermediate layer 22 and the hardness of the second intermediate layer 23. The 40% hardness of the lower layer 24 is, for example, 200N or more and 350N or less. However, the 40% hardness of the lower layer 24 may be 230N or more or 260N or more, or 320N or less or 290N or less. The impact resilience of the lower layer 24 is, for example, 20% or more. However, the impact resilience of the lower layer 24 is more preferably 25% or more. However, the hardness and impact resilience values of the lower layer 24 are not limited to the above examples.

The lower layer 24 is a holding layer that holds the upper layer 21, the first intermediate layer 22, and the second intermediate layer 23. The second intermediate layer 23 is an adjustment layer that adjusts the function of the upper layer 21 and the first intermediate layer 22 as a body pressure distribution layer, and the function of the lower layer 24 as a retention layer. A back side slit 13 is formed in the second intermediate layer 23 and the lower layer 24 .

The position of the back side slit 13 in the first direction D1 is different from the position of the second front side slit 12 in the first direction D1. The back side slits 13 and the second front side slits 12 are arranged alternately along the first direction D1. For example, the back side slit 13 is provided in the middle portion of the two second front side slits 12 lined up along the first direction D1.

The back side slit 13 extends from the back side 3 through the lower layer 24 to the second intermediate layer 23. The back side slit 13 has a linear first portion 13b located in the lower layer 24, and an expanded portion 13c that expands from the upper end of the first portion 13b so that the width of the back side slit 13 becomes wider. For example, the extended portion 13c is formed in the second intermediate layer 23. For example, the expanded portion 13c is curved in an arc shape.

For example, the lower layer 24 is made of a harder material than layers other than the lower layer 24. As an example, the lower layer 24 is made of high-hardness urethane foam. The lower layer 24 may be made of a material that is lighter than layers other than the lower layer 24. More specifically, the lower layer 24 may be made of lightweight urethane foam. Furthermore, the lower layer 24 may be made of a material that is lighter and has higher hardness than layers other than the lower layer 24. More specifically, the lower layer 24 may be made of lightweight, high-hardness urethane foam. When the lower layer 24 is made of lightweight urethane foam or lightweight high-hardness urethane foam, the weight of the cushion body 1 is about 300 to 400 g compared to when the lower layer 24 is made of a material other than lightweight urethane foam or lightweight high-hardness urethane foam. It can be made lighter.

The effects obtained from the cushion body 1 according to this embodiment will be explained. The cushion body 1 includes a plurality of convex portions 4 arranged in a grid pattern along each of the first direction D1 and the second direction D2 on the surface 2. A plurality of first front side slits 11 extending in the first direction D1 and a plurality of second front side slits 12 extending in the second direction D2 are formed on the surface 2.

In the area surrounded by the two first front side slits 11 lined up along the second direction D2 and the two second front side slits 12 lined up along the first direction D1, there is a convex part made up of a plurality of convex parts 4. A group G is provided. The cushion body 1 includes a plurality of protrusion groups G each including a plurality of protrusions 4. Each convex portion group G is provided in a region surrounded by the first front slit 11 and the second front slit 12. Therefore, when the user's body is placed on the surface 2, it is possible to deform each convex group G instead of the entire cushion body 1.

It is possible to deform only the convex group G of the cushion body 1 to which body pressure is applied. Therefore, the cushion body 1 can be deformed along the user's body, and the contact area of the body with the cushion body 1 can be increased, so that body pressure dispersion can be improved. The depth H3 of the second front slit 12 is less than or equal to the depth H2 of the first front slit 11. In this embodiment, the depth H3 of the second front slit 12 is shallower than the depth H2 of the first front slit 11. The depth H3 of the second front side slit 12 extending in the second direction D2 is less than or equal to the depth H2 of the first front side slit 11 extending in the first direction D1. Therefore, it is possible to improve the body pressure distribution property and the ability to turn over both when sleeping on the back and when sleeping on the side, and it is possible to improve the versatility so that it can be adapted to more users.

The cushion body 1 according to the present embodiment has a lower layer 24 that constitutes the back surface 3, and the lower layer 24 may be made of a material harder than layers other than the lower layer 24. In this case, the lower layer 24 can support the user's body more firmly, and the lower layer 24 can disperse the high pressure from the shoulders of the user when sleeping on his side. Therefore, the sleeping position of the user can be maintained with the lower layer 24, and the sleeping comfort when sleeping on the side can be further improved.

In this embodiment, the lower layer 24 may be made of a material that is lighter than layers other than the lower layer 24. In this case, since the lower layer 24 is made of a material that is harder and lighter than the other layers, the weight of the cushion body 1 as a whole can be reduced.

The cushion body 1 according to the present embodiment has an upper layer 21 including the top portion 4b of the convex portion 4, and the upper layer 21 may be made of a material having higher elasticity than layers other than the upper layer 21. In this case, since the upper layer 21 is made of a highly elastic material, the feeling when the user touches the surface 2 of the cushion body 1 can be improved.

At least one of the number of protrusions 4 aligned along the first direction D1 in the protrusion group G and the number of protrusions 4 aligned along the second direction D2 in the protrusion group G is 3 or more. Good too. In this case, three or more convex portions 4 aligned in the first direction D1 or three or more convex portions 4 aligned in the second direction D2 can be depressed at once by body pressure.

The cushion body 1 includes a plurality of convex portions 4 arranged in a grid pattern. The cushion body 1 has an upper layer 21 including the top portion 4b of the convex portion 4, and a lower layer 24 facing opposite to the upper layer 21. The upper layer 21 is made of a material with higher elasticity than layers other than the upper layer 21. Therefore, the user can feel good when touching the surface 2 of the cushion body 1, and body pressure dispersion and versatility can be improved.

The lower layer 24 is made of a material that is harder and lighter than layers other than the lower layer 24. Since the lower layer 24 is made of a harder material than the other layers, the lower layer 24 can firmly support the user's body and can disperse the high pressure from the shoulders when sleeping on the side. Therefore, the lower layer 24 can maintain the user's sleeping posture, improve the ability to turn over, and improve sleeping comfort when sleeping on the side. Since the lower layer 24 is made of a material that is lighter than the other layers, the weight of the cushion body 1 as a whole can be reduced.

An experiment was conducted on the cushion body 1 according to the example and the cushion body according to the comparative example, so the experiment will be explained. Similar to the cushion body 1 of the embodiment described above, the cushion body 1 according to the example has the first front side slit 11 and the second front side slit 12 formed in the first intermediate layer 22, and the high hardness and lightweight lower layer 24. This is a cushion body 1 having the following. The cushion body according to the comparative example is a cushion body that has only the first front slit 11 extending in the first direction D1 in the first intermediate layer 22 and does not have the second front slit 12.

FIG. 7(a) is an experimental result (actual measurement data) showing the body pressure distribution in a state where a user lies on his back on a cushion body according to a comparative example. FIG. 7(b) is an experimental result (actual measurement data) showing the body pressure distribution in a state where the user lies on his back on the cushion body 1 according to the example.

In the actual measurement data shown in FIGS. 7(a), 7(b), and FIGS. 8(a) and 8(b), which will be described later, the left side shows the head side of the cushion body, and the right side shows the leg side of the cushion body. , The darker the color, the more body pressure is being applied to the area. As shown in FIGS. 7(a) and 7(b), regarding the body pressure applied when lying on one's back, the cushion body 1 according to the example can disperse the body pressure in the lumbar region better than the cushion body according to the comparative example. I know that there is.

FIG. 8(a) is an experimental result (actual measurement data) showing the body pressure distribution in a state where a user lies on his side on a cushion body according to a comparative example. FIG. 8(b) is an experimental result (actual measurement data) showing the body pressure distribution in a state where a user lies sideways on the cushion body 1 according to the example. As shown in FIGS. 8(a) and 8(b), regarding the body pressure applied when lying on the side, the cushion body 1 according to the example disperses higher body pressure on the shoulders than the cushion body according to the comparative example. I can see that it's done.

In addition, the cushion body 1 according to the example was prepared as a cushion body 1 with a thickness of 9 cm and an overlay type cushion body 1 with a thickness of 4 cm, and the above experiment was conducted on each of them. . In these experiments, results similar to those shown in FIGS. 7(b) and 8(b) were obtained. 7B and FIG. Similar results were obtained as in 8(b).

FIG. 9(a) is an experimental result (actual measurement data) showing the results of measuring the sleeping posture of a user in a cushion body according to a comparative example. FIG. 9(b) shows experimental results (actual measurement data) showing the results of measuring the sleeping posture of the user in the cushion body 1 according to the example. The sleeping posture of the user was measured using a bedding shape measuring device. A Spine Fitter (registered trademark) was used as the bedding shape measuring device.

As shown in FIGS. 9(a) and 9(b), it can be seen that the cushion body 1 according to the example can reduce the sinking X in the user's buttocks more than the cushion body according to the comparative example. . This is considered to be because the cushion body 1 includes the lower layer 24 with high hardness, and the lower layer 24 supports the buttocks more firmly, thereby reducing the sinking X.

Figure 10 shows the results of measuring the amount of sinking of the user's shoulders, above the waist, and below the waist when sleeping on the side by placing a sheet-like (tape-like) bedding shape measuring device so as to extend in the width direction of the cushion body. (The average value of the results of three measurements) is shown. The user (subject) in this experiment was a large man with a height of 176 cm and a weight of 90 kg. A sheet tracer was used as the bedding shape measuring device. As shown in FIG. 10, the cushion body of Example 2, which has the first front side slit 11 and the second front side slit 12 and does not have the highly hard and lightweight lower layer 24, has a lower shoulder width than the cushion body of the comparative example. The amount of sinking above and below the waist has increased. On the other hand, in the cushion body of Example 1 having the lower layer 24 of high hardness and light weight, the amount of sinking at the shoulders, above the waist, and below the waist was smaller than that of the cushion body of the comparative example. As a result, it was found that in the cushion body 1 of Example 1, the lower layer 24 was able to reduce sinking, and it was possible to improve the ability to turn over when a large man slept on his side.

FIGS. 11(a), 11(b), and 11(c) show torque values measured when a sphere is placed on the surface of a cushion body and the sphere is pulled and rolled in the first direction D1 and second direction D2. The results are shown below. FIG. 11(a) shows the torque values when the pressure from the sphere is 35N, FIG. 11(b) shows the torque when the pressure from the sphere is 88N, and FIG. 11(c) shows the torque values when the pressure from the sphere is 113N. As shown in FIGS. 11(a), 11(b), and 11(c), the cushion body 1 according to Example 1 and the cushion body according to Example 2 are better than the cushion body according to the comparative example. It was found that the torque value was small. It has been found that the torque value can be reduced particularly when the sphere moves in the first direction D1 and when the pressure exerted by the sphere is large (113 N). From the above, it was found that in Examples 1 and 2, body pressure dispersion and rolling ability were better than in the comparative example.

The embodiments and examples of the cushion body according to the present disclosure have been described above. However, the cushion body according to the present disclosure is not limited to the embodiments or examples described above, and can be modified as appropriate within the scope of the gist of the claims. The shape, size, number, material, and arrangement of each part of the cushion body are not limited to the embodiments or examples described above, and can be changed as appropriate.

For example, in the embodiment described above, the cushion body 1, which is the core material of the mattress, was described. However, the cushion body according to the present disclosure may be a core material of bedding other than a mattress, such as a futon, or a core material of a pillow. Furthermore, the cushion body according to the present disclosure can be used as a cushion, a seat for a vehicle such as an automobile or a train, a seat for a transport aircraft other than a vehicle such as an aircraft, a seat for a non-transport aircraft such as a chair for nursing care, etc. It's okay. In the embodiment described above, an example was described in which the cushion body 1 is used to improve sleeping comfort. However, the cushioning material according to the present disclosure may be used to soften impact, and can be used for various purposes.

DESCRIPTION OF SYMBOLS 1... Cushion body, 1b... Long side, 1c... Short side, 2... Front surface, 3... Back surface, 4... Convex part, 4b... Top part, 5... First side surface, 6... Second side surface, 7... First recessed part, 8... Second recessed part, 9... Recessed part, 11... First front slit, 11b... First part, 11c... Expanded part, 12... Second front slit, 12b... First part, 12c... Expanded part, 13... Back side slit , 13b...first portion, 13c...extended portion, 21...upper layer, 22...first intermediate layer, 23...second intermediate layer, 24...lower layer, D1...first direction, D2...second direction, D3...third Direction, G...Protrusion group.

Claims

A cushion body having a long side extending along a first direction and a short side extending along a second direction intersecting the first direction, a front surface facing vertically upward, and a back surface facing vertically downward. There it is,
a plurality of convex portions arranged in a grid pattern along each of the first direction and the second direction on the surface;
a first front side slit extending in the first direction between the two convex portions aligned along the second direction;
a second front side slit extending in the second direction between the two convex portions lined up along the first direction;
has
A plurality of convex portions constituted by a plurality of convex portions surrounded by the two first front side slits lined up along the second direction and the two second front side slits lined up along the first direction. has a group,
The depth of the second front slit is less than or equal to the depth of the first front slit,
Cushion body.
having a lower layer constituting the back surface,
The lower layer is made of a harder material than layers other than the lower layer.
The cushion body according to claim 1.
The lower layer is made of a material that is lighter than layers other than the lower layer.
The cushion body according to claim 2.
having an upper layer including the top of the convex portion,
The upper layer is made of a material having higher elasticity than layers other than the upper layer.
The cushion body according to claim 1 or 2.
At least one of the number of protrusions aligned along the first direction in the protrusion group and the number of protrusions aligned along the second direction in the protrusion group is 3 or more;
The cushion body according to claim 1 or 2.