JP2023091107A - Mattress and mattress unit - Google Patents

Abstract

To provide a mattress that has improved the easiness of turning over.SOLUTION: A mattress 1 includes a cushion material of at least three layers of a first layer 11, a second layer 12, and a third layer 13 each having a predetermined thickness. In a thickness direction, the second layer 12 is interposed between the first layer 11 and the third layer 13. The rebound resilience of the second layer 12 is lower than that of the first layer 11 and the third layer 13. The thickness t3 of the third layer 13 is equal to or larger than the thickness adding up the thickness t1 of the first layer 11 and the thickness t2 of the second layer 12. The first layer 11 and the second layer 12 are formed with a groove 5 that penetrates the first layer 11 in the thickness direction and continues to at least part of the second layer 12. In a plane view from the surface of the first layer 11, the groove 5 is formed by a continuous and/or non-continuous straight line and/or a curved line.SELECTED DRAWING: Figure 1

Description

Applied for the application of Article 30, Paragraph 2 of the Patent Law On the date below, INOAC LIVING CO., LTD., a subsidiary of INOAC CORPORATION (each store of Color Foam Kenko SHOP), wholesaled and sold. April 3, 2020 Color Form Health SHOP Anjo 3-1-36, Imaike-cho, Anjo City, Aichi Prefecture April 3, 2020 Color Form Health SHOP Seino 1434 Nagahata, Hongo, Ikeda-cho, Ibi-gun, Gifu Prefecture April 3, 3 Color Form Health SHOP Nagoya Aichi Prefecture, Nagoya City, Nakamura-ku, Meieki Minami 2-chome 13-4 Reiwa April 26, 3 Color Form Health SHOP Furukawa 4-3-5 Furukawa Asahi, Osaki City, Miyagi Prefecture Ichinasuno Tenant Building May 15, 3 Color Form Health SHOP Kitahiroshima 1888 Mibu, Kitahiroshima-cho, Yamagata-gun, Hiroshima Prefecture May 20, 3 Color Form Health SHOP Ichikawa Misato 700 Otsuka, Ichikawa Misato-cho, Nishiyatsushiro-gun, Yamanashi Prefecture May 21, 2021 Color Form Health SHOP Osaki 2-9-3 Osaki, Shinagawa-ku, Tokyo Osaki West City Building 3F July 17, 2021 Color Form Health SHOP Ukiha 1266 Miharu, Ukiha-cho, Ukiha-shi, Fukuoka Prefecture On June 28, 1998, it was published on the INOAC net shop of INOAC Corporation, which is open to the public at the address below. https://jpn01. safelinks. protection. outlook. com/? url=https%3A%2F%2Faf-inoac. jp%2F&data=04%7C01%7Ctakuro. funahashi % 40 inoac. co. jp%7C6af7398b879f4271d3f608d9c35fd975%7C3cfae7b282554727b7e85af6a335dee9%7C1%7C0%7C637755638694155948%7CUnknown%7CTWFpbGZs b3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=c1bqc5LHZ4H%2FPBLNt6I%2BmCKaoYbpN8iSHllvVHAM pGY % 3D & reserved = 0

TECHNICAL FIELD The present invention relates to a mattress with improved rolling-over properties.

Conventionally, mattresses have been proposed for the purpose of achieving both a soft sleeping comfort and an appropriate sleeping posture. For example, the mattress described in Patent Document 1 is formed by laminating a plurality of multi-cellular cushion materials whose hardness is gradually increased from the upper layer to the lower layer, and a plurality of multi-cellular cushion materials having different hardness are oriented from the upper layer to the lower layer. A plurality of slits directed from the upper surface to the lower surface are formed so that at least one side of the slits approaches the edge of the adjacent slit. The slits are I-shaped and Y-shaped in plan view. At least the surface that comes in contact with the body is covered with a side material that uses a flexibly stretchable fabric.

Japanese Patent Application Laid-Open No. 09-121985

However, the mattress disclosed in Patent Literature 1 is laminated so that the hardness increases from the upper layer to the lower layer. When the user rests his/her body on the mattress, the sinking becomes deeper. As a result, there is a problem that the buttocks and the like sink excessively in the sleeping posture, making it difficult to turn over.

An object of the present invention is to solve the conventional problems, and an object thereof is to provide a mattress that improves the ability to turn over.

The mattress according to the first aspect of the present invention comprises at least three layers of cushioning material, ie, a first layer, a second layer, and a third layer, each having a predetermined thickness, and in the thickness direction, the second layer is , the second layer is sandwiched between the first layer and the third layer, and the second layer has a lower impact resilience than the first layer and the third layer.

According to this, since the second layer has a lower resilience modulus than the first and third layers, the second layer of the three layers begins to compress first. Therefore, excessive sinking of the body can be suppressed, and the ability to turn over can be improved.

Further, in the mattress, the rebound resilience of the first layer and the third layer may be in the range of 15 to 60%, and the rebound resilience of the second layer may be in the range of 5 to 30%.

In this case, since the first and third layers and the second layer each have an appropriate range of impact resilience, the second layer of the three layers begins to be compressed first. Therefore, excessive sinking of the body can be suppressed, and the ability to turn over can be improved.

Further, in the mattress, the thickness of the third layer may be equal to or greater than the sum of the thickness of the first layer and the thickness of the second layer.

In this case, since the thickness of the third layer is equal to or greater than the sum of the thicknesses of the first layer and the second layer, it is possible to suppress the user's feeling of bottoming out against the bed frame or the floor.

Further, in the mattress, the second layer may have a higher air permeability than the first and third layers.

In this case, since the second layer has a higher air permeability than the first and third layers, it has the function of circulating air from the second layer when the user rests his or her body on the surface of the first layer.

Further, in the mattress, a groove is formed in the first layer and the second layer in the thickness direction and continuously in at least a part of the second layer, and the groove is formed in the In plan view from the surface of the first layer, it may be formed by continuous or/and discontinuous straight lines and/or curved lines.

In this case, since the groove is formed in at least a part of the second layer continuously through the first layer, body pressure can be dispersed when the user puts his or her body on the groove.

A mattress according to a second aspect of the present invention includes at least two layers of cushioning material, a first layer and a second layer, each having a predetermined thickness, and in the thickness direction, the first layer and the second layer and the second layer has a lower impact resilience than the first layer, and a groove is formed in at least a part of the second layer continuously through the first layer in the thickness direction. be done.

According to this, the second layer has a lower rebound resilience than the first layer, and the groove is formed in at least a part of the second layer continuously through the first layer. Therefore, when the user puts his/her body in it, it is possible to improve the ability to turn over and distribute the body pressure.

A mattress according to a third aspect of the present invention includes at least two layers of cushioning material, a first layer and a second layer, each having a predetermined thickness, and in the thickness direction, the first layer and the second layer is superimposed, and the second layer has a higher air permeability than the first layer,
A groove penetrating at least the first layer is formed in the thickness direction.

According to this, the second layer has a greater air permeability than the first layer, and grooves are formed that penetrate at least the first layer. Therefore, when the user puts his/her body in it, the body pressure can be dispersed, and the grooves can further enhance the air circulation function from the surface of the first layer to the second layer.

A mattress unit according to a fourth aspect of the present invention is a mattress unit formed by arranging a plurality of the mattresses, wherein the mattresses form a rectangular plane with one side in the column direction and the other side in the row direction, At least part of the groove is formed along the column direction, and the mattresses are formed side by side with the ends in the row direction in contact with each other.

According to this, when the user rests his/her body on the mattress unit, the boundary portion acts like the groove row to distribute the body pressure.

BRIEF DESCRIPTION OF THE DRAWINGS It is the perspective view which showed the mattress 1 which concerns on the 1st aspect of this invention. 1 is a plan view of a first mattress 1a in which grooves 5 have a first groove shape among the mattresses 1 and the like of the present invention. FIG. Fig. 10 is a plan view of a second mattress 1b in which the grooves 5 have a second groove shape among the mattresses 1 and the like of the present invention. Fig. 10 is a plan view of a third mattress 1c among the mattresses 1 and the like of the present invention, in which grooves 5 have a third groove shape. Fig. 10 is a plan view of a fourth mattress 1d in which grooves 5 have a fourth groove shape among the mattresses 1 and the like of the present invention. Fig. 10 is a plan view of a fifth mattress 1e, among the mattresses 1 and the like of the present invention, in which the grooves 5 have a fifth groove shape; BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view of a mattress 1 according to the first aspect of the present invention, (a) showing a case where grooves 5 are not formed, and (b) showing grooves 5q penetrating the first layer 11 and continuing to the second layer. A case where the groove 5p is formed in a part of the two layers 12a is shown, and (c) shows a case where the groove 5p continuously penetrates the first layer 11 and the second layer 12a. Among the mattresses 1 according to the first aspect of the present invention, it is a cross-sectional view of a case where the second layer 12b is particularly formed of film-removed urethane foam, and (a) shows a case where grooves 5 are not formed. , (b) shows the case where the groove 5q penetrates the first layer 11 and is continuously formed in a part of the second layer 12b, and (c) shows the case where the groove 5p extends through the first layer 11 and the second layer 12b is shown continuously penetrating, and (d) is a conceptual diagram enlarging the surface of the second layer 12b. It is a diagram showing a state where a load is applied to the mattress 1, (a) shows a state where the load is applied to the mattress 1f of FIG. 7 (a), and (b) is a state where the mattress 1h of FIG. is added. It is a diagram showing a state when a person rolls over in the mattress 1 or the like, (a) shows the state of the mattress 1 of the present invention, and (b) shows the state of the mattress 100 having a higher rebound resilience than the present invention. , and (c) shows the state of the mattress 110 having a lower modulus of rebound resilience than the present invention. FIG. 4 is a cross-sectional view of a mattress 20 according to a second aspect of the present invention, (a) showing a case where grooves 5 are not formed, and (b) showing grooves 5q penetrating the first layer 21 and continuing to the second layer. A case where the groove 5p is formed in a part of the two layers 22 is shown, and (c) shows a case where the groove 5p penetrates the first layer 21 and the second layer 22 continuously. Fig. 3 is a cross-sectional view of the mattress 30 according to the third aspect of the present invention, in which the second layer 32 is formed of film-removed urethane foam, and (a) shows a case where grooves 5 are not formed. , (b) shows the case where the trench 5q is formed through the first layer 31, and (c) shows the case where the trench 5p penetrates the first layer 31 and the second layer 32 continuously. A plan view of the mattress unit 10a according to the fourth aspect of the present invention, which is the mattress 1 or the like according to the first to third aspects of the present invention, in which the row direction is arranged along the longitudinal direction and formed. is. The mattress unit 10b according to the fifth aspect of the present invention, which is a plan view of the mattress 1 or the like according to the first to third aspects of the present invention, in which the row direction is arranged along the longitudinal direction and formed. is.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a mattress 1 and the like embodying the present invention will be described with reference to the drawings. It should be noted that the embodiments for carrying out the invention and the drawings to be referred to are used to explain technical features that can be adopted by the present invention. The present invention is not limited to these. The configurations described in the drawings are merely illustrative examples, not limited to them.

The example shown in FIG. 1 is a perspective view showing a first mattress 1a as a representative example among the mattresses 1 and the like according to the present invention. Here, hereinafter, the mattress 1, the mattress 20, and the mattress 30 (the mattress 20 and the mattress 30 will be described later) are referred to as the mattress 1 and the like. The mattress 1 or the like forms a rectangular plane with one side in the column direction and the other side in the row direction, and has a predetermined thickness in the thickness direction. As an example, in the example shown in FIG. 1, the thickness direction has a three-layer structure of a first layer 11, a second layer 12, and a third layer 13. As shown in FIG.

2 to 6 are plan views showing the shape of the grooves 5 of the mattress 1 and the like. 7 to 12 are cross-sectional views showing cross-sectional shapes of the mattress 1 and the like. FIGS. 7(a), 8(a), 11(a), and 12(a) show configurations in which the grooves 5 are not formed. For the sake of explanation, among the mattresses 1 and the like, the types showing the shape of the groove 5 are the first mattress 1a to the fifth mattress 1e, and the types showing the sectional shape in the thickness direction are the mattress 1f to the mattress 30m. The mattress 1 and the like are configured by combining the shape of each groove 5 and the cross-sectional shape in the thickness direction.

<<Structure and Effects of Mattress 1 According to First Aspect>>
<Configuration of Mattress 1>
With reference to FIG.7 and FIG.8, the structure of the thickness direction is demonstrated among the structures of the mattress 1 which concerns on the 1st aspect of this invention first. The mattress 1 comprises at least three layers of cushioning material, a first layer 11, a second layer 12 and a third layer 13, each having a predetermined thickness. In the thickness direction, the second layer 12 is sandwiched between the first layer 11 and the third layer 13 and overlapped. The second layer 12 has a lower impact resilience than the first layer 11 and the third layer 13 . Although FIGS. 7 and 8 show the structure with three layers in the thickness direction, the structure may have four or more layers.

Next, the impact elastic modulus of the first layer 11, the second layer 12, and the third layer 13 will be described. The rebound resilience of the first layer 11 and the third layer 13 is in the range of 15-60%, and the rebound resilience of the second layer 12 is in the range of 5-30%. The maximum rebound resilience of the second layer 12 is greater than the minimum rebound resilience of the first layer 11 and the third layer 13, but the rebound resilience of the second layer 12 It is set within a range that satisfies the condition that it is lower than the third layer 13 . Here, the measured value of rebound resilience is according to the measurement standard JIS K 6400-3.

Further, the rebound resilience coefficients of the first layer 11, the second layer 12, and the third layer 13 preferably have the following relationship. The rebound resilience of the first layer 11 and the third layer 13 is in the range of 40-50%, and the rebound resilience of the second layer 12 is in the range of 18-25%. Note that the impact resilience is the value of the material that constitutes each layer.

Further, in the example of this embodiment, the density of the first layer 11 and the third layer 13 is 35-55 kg per cubic meter, and the hardness is 136-196N. The second layer 12 has a density of 25-45 kg per cubic meter and a hardness of 54-94N. The density and hardness are the values of the materials forming the first layer 11 to the third layer 13 . The material of the first layer 11 to the third layer 13 is desirably urethane foam, and may be olefin foam such as polyethylene, rubber foam, fiber, or the like. Here, the measured value of density is according to the measurement standard JIS K 7222. The hardness is measured according to the measurement standard JIS K 6400-2D method (25% compression).

The following effects are produced by the relationship of rebound resilience coefficients from the first layer 11 to the third layer 13 explained above. Since the second layer 12 has a lower modulus of resilience than the first layer 11 and the third layer 13, the second layer 12 is the first among the three layers to be compressed when the user rests the body on the mattress 1. start. The first layer 11 compresses less than the second layer 12 and maintains a constant repulsive force. Therefore, the mattress 1 can be pushed back while the first layer 11 is firmly in contact with the body, thereby suppressing excessive sinking of the body and improving the ability to turn over.

FIG. 9 shows the state when the mattress 1 is loaded. FIG. 9(a) shows a mattress 1f in which grooves 5, which will be described later, are not formed, and FIG. 9(b) shows a mattress 1h in which grooves 5 are formed. In either configuration, when a load is applied, the second layer 12 with a low rebound resilience compresses and absorbs the load, and the first layer 11 with a high rebound resilience pushes back against the load or excessively sinks. reduce congestion.

The rebound resilience of the first layer 11 and the third layer 13 is in the range of 15-60%, and the rebound resilience of the second layer 12 is in the range of 5-30%. Therefore, by manufacturing each layer so that the modulus of rebound resilience of each layer is within a certain allowable range, it is possible to maintain the ability to turn over while improving productivity including cost reduction.

Furthermore, the rebound resilience of the first layer 11 and the third layer 13 is set to be within the range of 40 to 50%, and the rebound resilience of the second layer 12 is set to be within the range of 18 to 25%. By doing so, it is possible to stabilize the quality that contributes to the improvement in rolling over. In addition, in the following description, it describes including the case where the mattress 1 is provided with the groove 5. FIG. However, even if the mattress 1f shown in FIG. 7A and the mattress 1j shown in FIG. have the effect of improving

<Relationship and effect of thickness of each layer>
Next, the thickness from the first layer 11 to the third layer 13 in the mattress 1 will be described with reference to FIGS. 7 and 8. FIG. FIG. 7 shows a case in which the first layer 11 to the third layer 13 are formed of the same material, and the second layer 12a is not subjected to film removal processing, which will be described later. As will be described later, FIG. 8 shows the case where the second layer 12b has been subjected to film removal processing so as to increase the air permeability. The thickness t3 of the third layer 13 is equal to or greater than the sum of the thickness t1 of the first layer 11 and the thickness t2 of the second layer 12 . More preferably, the thickness t1 of the first layer 11 and the thickness t2 of the second layer 12 are substantially the same thickness, and the thickness t3 of the third layer 13 is equal to the thickness t1 of the first layer 11 and the thickness t2 of the second layer 12. The thickness is approximately 1.5 times the thickness including t2. Specifically, t1 and t2 are 10-30 mm, and t3 is 50-70 mm. Preferably, t1 and t2 are 20 mm and t3 is 60 mm.

The following effects are obtained by the thickness relationship of each layer described above. Since the thickness t3 of the third layer 13 is equal to or greater than the sum of the thickness t1 of the first layer 11 and the thickness t2 of the second layer 12, it is possible to suppress the user's feeling of bottoming out against the bed frame or the floor. can. Furthermore, the thickness t1 of the first layer 11 and the thickness t2 of the second layer 12 are substantially the same thickness, and the thickness t3 of the third layer 13 is the thickness t1 of the first layer 11 and the thickness t2 of the second layer 12. If the thickness is approximately 1.5 times the added thickness, the feeling of bottoming out can be further suppressed. By setting the thickness of the third layer 13, which has a relatively high impact resilience, to a predetermined thickness, the feeling of hitting the bottom can be suppressed. Furthermore, by satisfying the relationship between the rebound elastic moduli of each layer described above, the feeling of bottoming out can be further suppressed, and the effect of improving the ability to turn over is enhanced.

As the thickness t1 of the first layer 11 and the thickness t2 of the second layer 12 increase, the effect of dispersing body pressure increases. In particular, when the thickness t2 of the second layer 12 increases, the effect of dispersing the body pressure increases. However, since the sinking becomes deeper, the ability to turn over and the feeling of hitting the bottom are inferior. Therefore, the thickness of each layer is set within the range of the thickness t1 of the first layer 11, the thickness t2 of the second layer 12, and the thickness t3 of the third layer 13, which are shown above, thereby improving the ability to turn over and disperse body pressure. effect and the effect of suppressing the feeling of bottoming out can be obtained in a well-balanced manner.

<<Description and Effects of the Configuration of the Groove 5>>
<Structure of Groove 5>
Next, the grooves 5 formed in the first layer 11 and the second layer 12 will be described with reference to FIGS. 1 to 6. FIG. In the first layer 11 and the second layer 12, a groove 5 is formed in at least a part of the second layer 12 continuously through the first layer 11 in the thickness direction. The grooves 5 are formed by continuous or/and discontinuous straight lines and/or curved lines in plan view from the surface of the first layer 11 . The examples shown in FIGS. 2 to 6 apply not only to the mattress 1 having a three-layer structure, but also to the mattress 20 and the mattress 30 having a two-layer structure.

As shown in FIGS. 2 to 6, the vertical direction in the drawing is the column direction, and the horizontal direction is the row direction. A center line C indicates the center in the row direction. Each column in the column direction is defined as L1 through L8. Note that the number of columns and rows is arbitrary. In the examples shown in FIGS. 1 to 6, the center line C in the row direction is between column L4 and column L5, and the shape in which the grooves 5 are formed is centered in plan view from the surface of the first layer 11. It is symmetrical about line C in the row direction. As shown in FIG. 1, the column spacing is L in the column direction, and the row spacing is D in the row direction. As an example, the column spacing L is 84 mm and the row spacing D is 97 mm. Note that the planar shape formed by the grooves 5 is not limited to the examples shown in FIGS.

Next, the depth of the groove 5 in the thickness direction will be described with reference to FIGS. 7 and 8. FIG. FIG. 7(a) shows a mattress 1f in which neither the first layer 11 nor the second layer 12 has grooves 5 formed therein. In the mattress 1g shown in FIG. 7(b) and the mattress 1k shown in FIG. 8(b), in the thickness direction, the groove 5 penetrates the first layer 11 and is continuously formed in a part of the second layer 12. be. The depth of the grooves 5 in the second layer 12 can be set arbitrarily. In the mattress 1h shown in FIG. 7(c) and the mattress 1m shown in FIG. It should be noted that the depth of the groove 5 is preferably in the range of 30 to 50 mm. Furthermore, a range of 35 to 45 mm is more preferred. This is because if the depth of the groove 5 is shallow, the effect of body pressure dispersion is lowered and the ability to turn over is also lowered.

Next, the shape formed by the grooves 5 in plan view from the surface of the first layer 11 will be described. The grooves 5 form a plurality of triangles 15 in the mattress 1 or the like. The triangles 15 consist of a first triangle 15a with discontinuous grooves 5 at three vertices, a second triangle 15b with discontinuous grooves 5 at two vertices, and a third triangle 15b with discontinuous grooves 5 at one vertex. contains at least one of the three types of triangles 15c of .

<Effect of groove 5>
The configuration of the grooves 5 described above provides the following effects. In the mattress 1, the groove 5 is formed in at least a part of the second layer 12 continuously through the first layer 11, so that body pressure can be dispersed when the user puts his or her body on it. The extent of the effect of dispersing the body pressure can be adjusted by adjusting the depth of the grooves 5 in the thickness direction. The effect of dispersing the body pressure is maximized when the groove 5 continues the first layer 11 and the second layer 12 and penetrates to the boundary with the third layer 13 . On the other hand, the groove 5 penetrates the first layer 11, and the smaller the depth in the second layer 12, the lower the effect of dispersing the body pressure. If it is set higher than the two layers 12, a sufficient effect can be obtained. The grooves 5 also contribute to improving the ability to turn over by dispersing the body pressure. As shown in FIG. 9(b), the groove 5 partially separates the first layer 11 and the second layer 12 when the user rests the body, so that the surface of the first layer 11 is totally sunk. It is possible to limit the sinking area by preventing sinking. Therefore, the mattress 1 can improve the rolling-over property.

Further, as an example, the groove 5a intersects and connects at the portion A1 of the groove 5a shown in FIG. Similarly, the position A2 of the groove 5f shown in FIG. 3B, the position A3 of the groove 5h shown in FIG. 4B, the position A1 of the groove 5a shown in FIG. The grooves 5 also intersect at points A4 and A5 of the groove 5j shown in FIG. 6B. In the mattress 1, when the user rests his/her body on the mattress 1, if the shoulder or the hipbone or the like hits the part where the grooves 5 intersect, the mattress 1 tends to sink. The points where the grooves 5 intersect are scattered over the entire surface of the mattress 1 . When the user tries to roll over, the shoulder or hipbone or the like is received at the intersection of the grooves 5.例文帳に追加Therefore, the user can easily turn over.

<Comprehensive effect of each element>
As explained above, the mattress 1 is effective by each of the three elements. That is, when the rebound resilience of the first layer 11 to the third layer 13 is in the proper range, the rolling-over property is improved. By setting the thickness of each layer from the first layer 11 to the third layer 13 within an appropriate range, it is possible to suppress the user's feeling of bottoming out against the bed frame or the floor. Furthermore, body pressure can be dispersed by forming the grooves 5 with an appropriate depth. In the following, in addition to the individual effects of each element, the effects produced by the combined action of each element will be described.

Turning over property of the mattress 1 will be described with reference to FIG. 10 . FIGS. 10(a) to 10(c) are diagrams for comparing and explaining the effect of differences in rebound resilience and depth of the grooves 5 in each mattress 1 (100, 110). From left to right, the user rolls over from lying on his back to lying on his side. FIG. 10(a) shows the case of the mattress 1 of the present invention. That is, the modulus of rebound resilience of the first layer 11 to the third layer 13 is within a proper range, the thickness of each layer from the first layer 11 to the third layer 13 is within a proper range, and the depth of the groove 5 is proper. It shows the case where the

According to this, since the modulus of rebound resilience of the first layer 11 to the third layer 13 is in an appropriate range, the body of the user sinks appropriately and the ability to turn over is improved. By forming the grooves 5 in a proper range of depth, it is possible to wrap the protruding part of the body and disperse the body pressure. When the user turns sideways, the grooves 5 intentionally cause the shoulders and the waist to sink (there is necessary sinking), so that the ability to turn over is improved. Furthermore, the user's feeling of bottoming out against the bed frame or the floor is suppressed. Therefore, the mattress 1 can exhibit a plurality of effects at the same time through the comprehensive action of setting each element within an appropriate range.

On the other hand, FIG. 10(b) shows the case of a mattress 100 in which the modulus of rebound resilience exceeds the appropriate range and the grooves 5 are not formed. Since the mattress 100 has a high rebound resilience, the body is less likely to sink and the user can easily turn over. However, since the mattress 100 sinks less, the moving distance when turning over is long, and the body tends to shake. Additionally, when you lie on your side, you put more pressure on your shoulders.

Moreover, FIG.10(c) shows the case of the mattress 110 whose impact resilience rate is low exceeding an appropriate range, and the depth of the groove|channel 5 exceeds an appropriate range and is deep. The mattress 110 has a high body pressure dispersing effect, but the body sinks excessively because of its low impact resilience. It is difficult for the user to move the body, so extra muscle power is used. This is because the first layer 11 in contact with the body is crushed and no pushing force is generated.

Next, the shape formed by the grooves 5 in plan view from the surface of the first layer 11 will be described. The mattress 1 or the like is formed with a plurality of triangles 15 by the grooves 5, as already explained. Hereinafter, each form from the 1st mattress 1a to the 5th mattress 1e is demonstrated.

<Structure from first groove-shaped first mattress 1a to third groove-shaped third mattress 1c>
The forms of the first mattress 1a to the third mattress 1c will be described with reference to FIGS. 2 to 4. FIG. From the first mattress 1 a to the third mattress 1 c , a plurality of triangles 15 are formed by the grooves 5 in plan view from the surface of the first layer 11 . The triangles 15 consist of a first triangle 15a with discontinuous grooves 5 at three vertices, a second triangle 15b with discontinuous grooves 5 at two vertices, and a third triangle 15b with discontinuous grooves 5 at one vertex. contains at least one of the three types of triangles 15c of . In the example of the first mattress 1a to the third mattress 1c, the grooves 5 form one type of triangle 15 (any one of 15a, 15b, and 15c) except for the rows L1 and L8, which are both ends in the row direction. be.

Figure 2 shows the first mattress 1a when the grooves 5 are of the first groove shape. The first groove shape has two patterns. The first pattern shown in FIG. 2(b) shows the pattern of the grooves 5 from row L2 to row L7. The second pattern shown in FIG. 2(c) shows the pattern of the grooves 5 in columns L1 and L8, which are ends in the row direction.

As shown in FIGS. 2(a) and 2(b), the first pattern is arranged in the column direction and has an inverted V-shaped groove 5b formed at the upper end, and a plurality of inverted Y-shaped grooves 5b at the other positions. shaped grooves 5a are formed. As shown in FIG. 2(b), in the inverted Y shape, the groove width is W and one side is side length S. As shown in FIG. As an example, the groove width W is 6 mm and the side length S is 81 mm. Each side length S in the inverted Y shape is the same. The groove width W of the other grooves 5 is also 6 mm. As shown in FIG. 2(c), the second pattern has an inverted V-shaped groove 5d formed at one end in the row direction and having a shorter end in the row direction. At other positions, a plurality of inverted Y-shaped grooves 5c with short ends in the row direction and a plurality of oblique linear grooves 5e are formed side by side along the column direction.

As shown in FIG. 2(a), a plurality of first triangles 15a are formed by grooves 5b formed at one end in the row direction and grooves 5a formed side by side while being shifted in the column and row directions. is formed. The first triangle 15a may be an equilateral triangle or an isosceles triangle. The same applies to the second triangle 15b and the third triangle 15c described below. The first triangle 15a is formed by discontinuous grooves 5 at all three vertices and joins the adjacent first triangle 15a at each vertex. The groove 5 is formed with a predetermined depth from the surface of the first layer 11 toward the second layer 12 .

As shown in FIG. 2(b), grooves 5a are connected by curved lines 50 at intersections of linear portions. The groove 5a has an arc-shaped curve 50 at the point where the tip portion and the linear portion intersect. The grooves 5b are also connected by curved lines 50 at intersections of the linear portions. Similarly, in the grooves 5c, 5d, and 5e shown in FIG. 2(c), the points where the linear portions intersect and the tip portions are formed by curved lines 50, respectively. In addition, each linear portion of the groove 5 is not limited to a strictly straight line, and may be a curved line. Similarly, in the examples shown in FIGS. 3 to 6, the tips of the grooves 5 and the intersections of the grooves 5 are formed by curved lines 50. FIG. The grooves 5 are formed by curved lines 50 at intersections and tips, so cracks can be reduced. It should be noted that the portion where the curved line 50 is formed may be formed simply by the intersection of straight lines instead of the circular arc shape. The radii of curves 50 may all be the same, or they may be different.

<Effect of first mattress 1a>
As explained above, the first groove-shaped first mattress 1a has the following effects. When the user puts his or her body on the surface of the first layer 11, the first triangle 15a in the body contact area deforms according to the movement of the body using the grooves 5 as buffer areas. The first triangle 15a in the first mattress 1a is formed by grooves 5 with none of the three sides continuous with each other, so that all three vertices are connected to the other first triangle 15a. Therefore, when the first triangle 15a is deformed using the groove 5 as a buffer region, the first triangle 15a and the other first triangles 15a act to mutually suppress the amount of deformation. When the user leaves the body, the impact resilience of the first mattress 1a in the three-layer structure from the first layer 11 to the third layer 13 described above (the two-layer structure with the first layer 11 and the second layer 12 described later) ), a constant repulsive force is maintained to maintain the ability to turn over, and the effect of dispersing body pressure is obtained.

<Structure of second groove-shaped second mattress 1b>
Figure 3 shows the second mattress 1b when the grooves 5 are of the second groove shape. The groove shape of the second mattress 1b has two patterns. The first pattern shown in FIG. 3(b) shows the pattern of the grooves 5 from row L2 to row L7. A first pattern is a groove 5f in which the grooves 5 are connected in the row direction with respect to the groove shape of FIG. 2(b). The grooves 5f have a shape connected in the column direction with respect to the groove shape shown in FIG. The second pattern shown in FIG. 3(c) shows the pattern of the grooves 5 in columns L1 and L8, which are ends in the row direction. The groove 5g has a shape in which the row direction is continuously connected to the groove shape of FIG. 2(c). The groove 5e is the same as in FIG. 2(c).

As shown in FIG. 3, the second mattress 1b has a plurality of second triangles 15b in plan view on the surface of the first layer 11. As shown in FIG. The second triangle 15b has one of three vertices connected by the groove 5, and two sides sandwiching the vertices formed continuously are formed by the groove 5. As shown in FIG.

<Effect of second mattress 1b>
As described above, the second groove-shaped second mattress 1b has the following effects. Compared with the first triangle 15a of the first mattress 1a shown in FIG. 2, the second triangle 15b has a higher degree of freedom when deformed because the grooves 5 are connected at one vertex. Therefore, compared to the first mattress 1a, the repulsive force when the user puts his/her body on the mattress is reduced to a certain degree, but the effect of dispersing the body pressure is increased.

<Structure of third groove-shaped third mattress 1c>
Figure 4 shows a third mattress 1c where the grooves 5 are of the third groove shape. In the third mattress 1c, with respect to the groove shape shown in FIG. 2, the grooves 5 are continuously connected at all diagonal lines D1 that cross the row direction in the downward-right direction and all diagonal lines D3 that cross the row direction in the upward-right direction. It is formed by a groove 5h. In the rows L1 and L8, discontinuous ends of the oblique line D1 and the oblique line D3 are formed as shown in FIG. 4(c).

As shown in FIG. 4 , the third mattress 1 c is formed with a plurality of third triangles 15 c and parallelograms 25 in plan view on the surface of the first layer 11 . The third triangle 15c has two of its three vertices connected by the groove 5 and is continuous with the adjacent third triangle 15c at one vertex. The parallelogram 25 is continuous around the groove 5 and is formed by joining two third triangles 15c.

<Effect of third mattress 1c>
As explained above, the third groove-shaped third mattress 1c has the following effects. Compared to the second triangle 15b of the second mattress 1b shown in FIG. 3, the third triangle 15c has a higher degree of freedom in deformation because the grooves 5 are connected at two vertices. Furthermore, in addition to the third triangle 15c, the parallelogram 25 is formed by the circumferentially continuous groove 5, so the degree of freedom is higher. Therefore, compared to the second mattress 1b, the repulsive force when the user puts his/her body thereon is further reduced, but the body pressure distribution effect is greater.

As described above, the first mattress 1a to the third mattress 1c differ in the effect of dispersing body pressure and the degree of repulsive force depending on their configurations. The improvement in rolling over can be obtained by the synergistic effect of dispersing the body pressure and a constant repulsive force. Therefore, there is an effect that any one of the first mattress 1a to the third mattress 1c can be selected according to the feeling that the user feels when entrusting his/her body.

<Configuration of fourth groove-shaped fourth mattress 1d and fifth groove-shaped fifth mattress 1e>
Next, with reference to FIG. 5 and FIG. 6, the shape of grooves in plan view from the surface of the first layer 11 in the fourth mattress 1d and the fifth mattress 1e will be described. The triangles 15 formed by the grooves 5 on the fourth mattress 1d and the fifth mattress 1e include at least two of the three types of first triangle 15a, second triangle 15b and third triangle 15c. A difference from the first mattress 1 a to the third mattress 1 c is that the grooves 5 form a plurality of types of triangles 15 .

<Configuration of fourth groove-shaped fourth mattress 1d>
FIG. 5 shows a fourth mattress 1d where the grooves 5 are of the fourth groove shape. The fourth mattress 1d differs from the first mattress 1a shown in FIG. 2 in the following points. As shown in FIG. 5A, the boundary between columns L1 and L2, the boundary between columns L3 and L4, the boundary between columns L5 and L6, and the boundary between columns L7 and L8 in the column direction are , a groove 5f in which the grooves 5 are continuous in the row direction is formed. That is, the grooves 5 in the row direction are continuously formed every other row. As shown in FIG. 5(b), the fourth groove shape is formed by grooves 5a, 5b, 5f, 5g and 5e.

As shown in FIGS. 5(a) and 5(b), the fourth groove shape is a form in which first triangles 15a and second triangles 15b are mixed. As shown in FIG. 5A, the first triangle 15a is a grid-like hatched portion inclined by 45 degrees, and the second triangle 15b is a non-tilted grid-like hatched portion. For the sake of explanation, only some lines are hatched. The first triangles 15a and the second triangles 15b are arranged along the row direction and alternately formed along the column direction.

<Effect of the fourth mattress 1d>
As explained above, the fourth groove-shaped fourth mattress 1d has the following effects. The first to third groove shapes are each formed with only the same type of triangles 15, but the fourth groove shape is formed by mixing two types of first triangles 15a and second triangles 15b. be done. Therefore, an intermediate effect between the first mattress 1a having the first shape and the second mattress 1b having the second shape with respect to generation of repulsive force and dispersion of body pressure when the user rests the body on the body is It can be obtained substantially uniformly with respect to the surface of the layer 11 . Furthermore, it is possible to have both the characteristics of the first mattress 1a and the second mattress 1b. In the example shown in FIG. 5, the first triangles 15a and the second triangles 15b are arranged substantially evenly. Alternatively, various configurations such as biasing in the column direction are possible.

<Configuration of Fifth Groove-shaped Fifth Mattress 1e>
Next, the fifth mattress 1e in which the grooves 5 are shaped like the fifth groove will be described with reference to FIG. As shown in FIG. 6(a), the groove shape in plan view on the surface of the first layer 11 of the fifth mattress 1e is oblique to the first mattress 1a shown in FIG. At an oblique line D3 crossing the line D1 in the upward-right direction, the grooves 5 are formed by continuous grooves 5j. The oblique line D1 along which the grooves 5 are continuous and the oblique line D2 parallel to the oblique line D1 and in which the grooves 5 are not continuous are alternately formed in the column direction. The same applies to the relationship between the oblique line D3 where the grooves 5 are continuous and the oblique line D4 which is parallel to the oblique line D3 and where the grooves 5 are not continuous. As shown in FIGS. 6(a) and 6(b), the fifth groove shape is formed by grooves 5a, 5b, 5e, and 5j.

As shown in FIGS. 6(a) and 6(b), the fifth groove shape is a form in which a first triangle 15a, a second triangle 15b and a third triangle 15c are mixed. As shown in FIG. 6(a), the first triangle 15a is a 45-degree inclined grid hatched portion, the second triangle 15b is a non-tilted grid hatched portion, and the third triangle 15c are hatched with parallel lines. For the sake of explanation, only some lines are hatched.

<Effect of fifth mattress 1e>
As explained above, the fifth groove-shaped fifth mattress 1e has the following effects. The first groove-shaped first mattress 1a to the third groove-shaped third mattress 1c are each formed with only the same type of triangles 15, while the fifth groove-shaped mattress has three types of first triangles 15a and third grooves 15a. The second triangle 15b and the third triangle 15c are mixed and formed. Therefore, the effect of the first groove-shaped first mattress 1a to the third groove-shaped third mattress 1c on the generation of the repulsive force and the distribution of the body pressure when the user rests the body on the first layer 11 can be obtained substantially uniformly with respect to the surface of the Furthermore, it is possible to combine the characteristics of the first mattress 1a to the third mattress 1c.

In the example shown in FIG. 6, the diagonal lines D1 and D2, and the diagonal lines D3 and D4 are alternately formed to form the first triangle 15a, the second triangle 15b, and the third triangle 15c. are arranged substantially evenly. However, it is not limited to this, and depending on the application, for example, the diagonal lines D1 and D2, and the diagonal lines D3 and D4 may be arranged unevenly, and various configurations are possible.

Since the fourth mattress 1d and the fifth mattress 1e described above can form a plurality of triangles 15 by the grooves 5, partially different triangles 15 can be arranged in one mattress 1 or the like. Various selections are possible according to the application of the mattress 1 etc. to be used.

<Explanation and effect of the ventilation amount of each layer>
Next, each ventilation amount from the first layer 11 to the third layer 13 will be described. From the mattress 1j to the mattress 1m shown in FIG. Here, the ventilation volume is the air volume determined by the JIS standard K6400-7A method. The air permeation amount of each layer may satisfy the relationship that the second layer 12b is larger than the first layer 11 and the third layer 13. Specifically, the air permeation amount of the first layer 11 and the third layer 13 is 60 to 80 L/min, and the second layer 12 is preferably 210-270 L/min.

Next, the second layer 12b will be explained. The second layer 12b is processed so as to increase the air permeability by subjecting urethane foam to a film-removing treatment. The film-removing treatment may be any treatment method that is normally employed as a treatment method capable of removing cell membranes. The use of special silicon as a material, the use of a film-removing material, and the like. FIG. 8(d) is an enlarged view showing the state of the cells 23 of the second layer 12b subjected to the film removal treatment. The urethane foam molding has a plurality of cells 23, and the cell membranes of the surface cells 23 are removed by a membrane removal treatment. By removing the cell membrane, air permeability is improved and the amount of air permeation increases. The configuration of the second layer 12b is the same as that of the second layer 32 of the mattress 30 described later.

The following effects are produced by the relationship of the air permeation amount in each layer described above. The mattress 1 is required to have a function of circulating air containing heat and/or moisture generated by body temperature and perspiration when the user uses the mattress 1 . On the other hand, in the mattress 1 (1j to 1m), since the air permeability of the second layer 12 is larger than the air permeability of the first layer 11 and the third layer 13, the user can rest his/her body on the surface of the first layer 11. It has the function of circulating air from the second layer 12 when deposited. In particular, as shown in FIGS. 1 to 6 and FIGS. 8(b) and 8(c), when the grooves 5 are formed, the air circulation function is more effective. That is, the groove 5 is formed through the first layer 11 with which the user's body is in contact, and continues to a part of the second layer 12 having a large air permeability. Thus, air containing heat and/or moisture generated by body temperature and perspiration flows directly to the second layer 12b. The mattress 1 (1j to 1m) has the effect of having a high circulation function of air containing heat and/or moisture.

By combining the elements described above, the mattress 1 (1j to 1m) has the effect of enhancing the circulation function of air containing heat and/or moisture, as well as the already described improvement of the ability to turn over and/or the body. This has the effect of enhancing the effect of dispersing pressure and/or the effect of reducing the feeling of bottoming against the bed frame or floor. However, the mattress 1 is required to enhance the circulation function of air containing heat and/or moisture, regardless of the improvement in tossing and turning, the effect of dispersing body pressure, and/or the effect of reducing the feeling of bottoming out. be.

On the other hand, the mattress 1 (1j to 1m) may have the following configuration. That is, the second layer 12b of the mattress 1 (1j to 1m) should have a higher air permeability than the first layer 11 and the third layer 13. The relationship between the thickness t1 of the first layer 11, the thickness t2 of the second layer 12, and the thickness t3 of the third layer 13 shown in FIG. 8 is not limited. The second layer 12b may have a modulus of impact resilience equal to or higher than that of the first layer 11 and/or the third layer 13 .

Further, as shown in FIG. 8A, even if the grooves 5 are not formed, the air circulation function can be enhanced if the second layer 12b has a large ventilation amount. Furthermore, the depth of the groove 5 in the thickness direction does not have to be formed in a part of the second layer 12b as shown in the groove 5q in FIG. Improves air circulation. This is because the heat and/or moisture generated from the body passes through the first layer 11 and flows to the second layer 12b, which has a large air permeability, so that the air circulation function can be further enhanced.

<<Structure and Effects of Mattress 20 According to Second Aspect>>
<Configuration of Mattress 20>
Next, the configuration of the mattress 20 (20f to 20h) according to the second aspect of the present invention will be explained. The configuration in the thickness direction is different from the mattress 1 according to the already explained first aspect. Note that examples of the shape of the grooves 5 in plan view from the surface of the first layer 11 (21, 31) shown in FIGS.

The mattress 20 comprises at least two layers of cushioning material, a first layer 21 and a second layer 22, each having a predetermined thickness. The first layer 21 and the second layer 22 are stacked in the thickness direction, and the second layer 22 has a lower impact resilience than the first layer 21 . Further, the groove 5 is formed in at least a part of the second layer 22 continuously through the first layer 21 in the thickness direction. Since the mattress 20 has at least two layers of cushioning material, it is needless to say that the mattress 20 includes a structure having three layers of cushioning material.

Next, the rebound resilience of each layer of the cushion material in the mattress 20 will be described. The rebound resilience of the first layer 21 is in the range of 15-60%, and the rebound resilience of the second layer 22 is in the range of 5-30%. More preferably, the rebound resilience of the first layer 21 is in the range of 40 to 50%, and the rebound resilience of the second layer 22 is in the range of 18 to 25%. These rebound resilience ranges are the same as the relationship between the first layer 11 and the second layer 12 in the mattress 1, and the evaluation results in Table 1 are applicable.

Next, referring to FIG. 11, the configuration of the mattress 20 in the thickness direction will be described. In FIG. 11, as in FIG. 7, the cushioning materials of the first layer 21 and the second layer 22 are made of the same material. The thickness t21 of the first layer 21 and the thickness t22 of the second layer 22 may be substantially the same, or the thickness t22 of the second layer 22 may be larger or smaller than the thickness t21 of the first layer 21 .

Next, the configuration of the grooves 5 in the mattress 20 will be described. The depth of the groove 5 in the thickness direction will be described with reference to FIG. 11 . FIG. 11(a) shows a mattress 20f in which neither the first layer 21 nor the second layer 22 has grooves 5 formed therein. In the example shown in FIG. 11(b), similarly to FIGS. 7(b) and 8(b), the grooves 5 penetrate the first layer 21 in the thickness direction, and continue to the second layer 22. Partially formed mattress 20g is shown. The depth of the grooves 5 in the second layer 22 can be set arbitrarily. In the example shown in FIG. 11(c), the groove 5 shows the mattress 20h continuously penetrating the first layer 21 and the second layer 22. In the example shown in FIG.

<Effect of Mattress 20>
As explained above, the mattress 20 according to the second aspect of the present invention has the following effects. In order to reduce manufacturing costs, it is desired that the mattress 20 improves the ability to turn over with less layers of cushion material and disperses the body pressure. On the other hand, in the mattress 20, the second layer 22 has a lower impact resilience than the first layer 21, and the groove 5 is formed in at least a part of the second layer 22 continuously through the first layer 21. be done. Therefore, when the user puts his/her body in it, it is possible to improve the ability to turn over and distribute the body pressure.

In addition, as in the mattress 1 already described, the rebound resilience of the first layer 21 is within the range of 15 to 60%, and the rebound resilience of the second layer 22 is within the range of 5 to 30%. By setting the rebound resilience of each layer to a certain range during manufacturing, it is possible to improve the productivity including cost reduction, while also improving the ability to turn over.

Furthermore, by increasing the controllability in manufacturing, the rebound resilience of the first layer 21 is within the range of 40 to 50%, and the rebound resilience of the second layer 22 is within the range of 18 to 25%. It is possible to improve the ability to turn over.

<<Structure and Effects of Mattress 30 According to Third Aspect>>
<Configuration of Mattress 30>
Next, the structure of the mattress 30 which concerns on the 3rd aspect of this invention is demonstrated. As shown in FIG. 12, the mattress 30 includes at least two layers of cushioning material, a first layer 31 and a second layer 32, each having a predetermined thickness. 32 are superimposed, and the second layer 32 has more air permeability than the first layer 31 . Further, grooves 5 are formed through at least the first layer 31 in the thickness direction. Since the mattress 30 has at least two layers of cushioning material, it is needless to say that the mattress 30 includes a structure having three layers of cushioning material.

Mattress 30 differs from mattress 20 in the configuration of second layer 32 . FIG. 12 shows the case of the second layer 32 processed to increase the air permeability by removing the film from the second layer 32 as compared with FIG. The thickness t31 of the first layer 31 and the thickness t32 of the second layer 32 may be substantially the same, and the thickness t32 of the second layer 32 may be larger or smaller than the thickness t31 of the first layer 31 .

FIG. 12(a) shows a mattress 30j in which neither the first layer 31 nor the second layer 32 has grooves 5 formed therein. FIG. 12(b) shows a mattress 30k in which grooves 5q penetrate from the surface of the first layer 31 to the boundary with the second layer 32. FIG. Note that the groove 5q may be formed up to a part of the second layer 32 as in FIG. 11(b). FIG. 12(c) shows a mattress 30m in which the groove 5p continuously penetrates the first layer 31 and the second layer 32. FIG.

Next, each ventilation amount of the first layer 31 and the second layer 32 will be described. From the mattress 30j to the mattress 30m shown in FIG. The air permeability of each layer may satisfy the relationship that the second layer 32 is larger than the first layer 31. Specifically, the air permeability of the first layer 31 is 60 to 80 L / min, and the second layer 32 is desirably 210 to 270 L/min.

<Effect of Mattress 30>
As explained above, the mattress 30 according to the third aspect of the present invention has the following effects. In order to reduce manufacturing costs, the mattress 30 is desired to enhance the ability to circulate heat and/or moisture generated by the body with fewer layers of cushioning material. On the other hand, in the mattress 30, the second layer 32 has a higher ventilation rate than the first layer 31, so when the user rests his or her body on the surface of the first layer 31, the air from the second layer 32 is released. Has a circulatory function. In particular, as shown in FIGS. 1 to 6 and FIGS. 12(b) and 12(c), the effect of the air circulation function is greater when the grooves 5 are formed. That is, since the grooves 5 are continuously formed through the first layer 31 with which the user's body is in contact and at least to the boundary with the second layer 32, the heat and/or moisture generated by body temperature and perspiration are absorbed. Air flows directly to the second layer 32 . Therefore, the mattress 30 has the effect of having a high circulation function of air containing heat and/or moisture.

Regarding the first layer 21 and the second layer 22, the elements of the rebound resilience and the grooves 5 are defined for the mattress 20, and the elements of the air permeability are defined for the mattress 30, but the elements may be combined.

<Description of usage pattern of mattress 1, etc.>
Next, the mode of use of the mattress 1 and the like will be described. The mattress 1 and the like may be formed as a single sheet according to the user's height, physique, etc., or may be formed as a unit by arranging a plurality of sheets. When the mattress 1 or the like is used alone, the column direction may be aligned with the user's height direction, or the row direction may be aligned with the user's height direction. A mattress unit 10 formed by arranging a plurality of mattresses 1 and the like will be described with reference to FIGS. 13 and 14. FIG. The mattress 1 and the like used in the mattress unit 10 form a rectangular plane with one side in the column direction and the other side in the row direction, as already described. The direction along the height direction of the user is defined as the longitudinal direction, and the direction orthogonal to the longitudinal direction is defined as the width direction.

The mattress unit 10 may be covered with a cover member while a plurality of mattresses 1 and the like are arranged side by side. Alternatively, the borders 24 (26) where the mattresses 1 and the like contact each other may be connected by bonding, stitching, or other means. Alternatively, the mattresses 1 and the like may simply be arranged.

<Structure and Effects of Mattress Unit 10a of First Embodiment>
The mattress unit 10a which is 1st embodiment of the mattress unit 10 is demonstrated. As shown in FIG. 13, the mattress unit 10a uses a mattress 1 or the like in which at least a part of the grooves 5 is formed along the row direction. The mattress units 10a are formed by arranging the mattresses 1 and the like so that the ends in the row direction are brought into contact with each other at the boundary portions 24 . In the mattress unit 10a, a part of the grooves 5 are connected in the width direction to form a groove row 35, which is substantially parallel to the boundary portion 24 where the mattresses 1 and the like are in contact with each other.

The mattress unit 10a described above has the following effects. The mattress unit 10 formed by arranging a plurality of mattresses 1 and the like is required to allow the user to use the boundary portion 24 without discomfort. On the other hand, when the user rests his/her body on the mattress unit 10a, the boundary portion 24 functions to disperse the body pressure in the same way as the groove row 35 does. Therefore, even if a part of the user's body comes into contact with the boundary portion 24, discomfort is suppressed.

<Structure and Effects of Mattress Unit 10b of Second Embodiment>
A mattress unit 10b, which is a second embodiment of the mattress unit 10, will be described. As shown in FIG. 14, the mattress unit 10b uses a mattress 1 or the like in which at least part of the grooves 5 are formed along the column direction. The mattress units 10b are formed by arranging the mattresses 1 and the like so that the ends in the column direction are brought into contact with each other at the boundary portions 26 .

The mattress unit 10b described above has the following effects. The mattress unit 10, which is formed by arranging a plurality of mattresses 1 and the like, is required to improve the ability to turn over in the same way as when the mattress 1 and the like are used alone. On the other hand, in the mattress unit 10b, the rows of grooves 35 are arranged in the longitudinal direction, so that the user can rest his/her body with the height direction along the direction of the rows of grooves 35. As shown in FIG. Therefore, it becomes easier for the user to roll over.

When a plurality of mattresses 1 and the like are arranged in the mattress unit 10a and the mattress unit 10b, the mattresses 1 and the like of the same kind may be arranged. Alternatively, different types of mattresses 1 and the like may be arranged as in the following configuration.

The mattress unit 10 may have the following structure for the mattress 1 and the like to be used. Namely, a first mattress 1a with a first triangle 15a formed by the groove 5, a second mattress 1b with a second triangle 15b formed by the groove 5, and a third triangle 15c formed by the groove 5. It may comprise at least two of the formed third mattresses 1c.

In this case, by arranging different types of mattresses 1 and the like, the mattress unit 10 has appropriate characteristics (ability to turn over, dispersibility of body position, degree of feeling of bottoming, Other sleeping comfort, etc.) can be selected.

In addition, the mattress unit 10 may include the following for the mattress 1 and the like used. Namely, a fourth mattress 1d formed by the groove 5 including the first triangle 15a and the second triangle 15b, and a groove 5 including the first triangle 15a, the second triangle 15b and the third triangle 15c. at least one of the fifth mattresses 1e formed by

In this case, by arranging different types of mattresses 1 and the like, the mattress unit 10 has more detailed characteristics (ease of rolling over, dispersibility of body position, degree of bottoming feeling, Other sleeping comfort, etc.) can be selected.

1 (1f, 1g, 1h, 1j, 1k, 1m, 20, 20f, 20g, 20h, 30, 30j, 30k, 30m) Mattress 1a First mattress 1b Second mattress 1c Third mattress 1d Fourth mattress 1e Fifth mattresses 5, 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h, 5j, 5p, 5q grooves 10, 10a, 10b mattress units 11, 21, 31 first layers 12, 12a, 12b, 22, 32 second two layers 13, 23 third layer 50 curves D1, D2, D3, D4 lines L1, L2, L3, L4, L5, L6, L7, L8 rows t1, t2, t3, t21, t22, t31, t32 thickness

Claims (8)

At least three layers of cushioning material, a first layer, a second layer, and a third layer, each having a predetermined thickness,
In the thickness direction, the second layer is sandwiched and overlapped between the first layer and the third layer,
The second layer of the mattress has a lower modulus of rebound resilience than the first and third layers. The impact resilience of the first layer and the third layer is in the range of 15 to 60%,
2. The mattress of claim 1, wherein the rebound resilience of said second layer is in the range of 5-30%. 3. The mattress according to claim 1, wherein the thickness of the third layer is equal to or greater than the sum of the thickness of the first layer and the thickness of the second layer. 4. A mattress according to any preceding claim, wherein the second layer has a higher air permeability than the first and third layers. A groove is formed in the first layer and the second layer in the thickness direction and continuously in at least a part of the second layer, penetrating the first layer in the thickness direction,
5. The mattress according to any one of claims 1 to 4, wherein said grooves are formed by continuous or/and discontinuous straight lines and/or curved lines in plan view from the surface of said first layer. At least two layers of cushioning material, a first layer and a second layer, each having a predetermined thickness,
In the thickness direction, the first layer and the second layer are superimposed,
The second layer has a lower impact resilience than the first layer,
A mattress in which grooves are formed in at least a portion of the second layer continuously through the first layer in the thickness direction. At least two layers of cushioning material, a first layer and a second layer, each having a predetermined thickness,
In the thickness direction, the first layer and the second layer are superimposed,
The second layer has a higher air permeability than the first layer,
A mattress having a groove penetrating at least the first layer in the thickness direction. A mattress unit formed by arranging a plurality of mattresses according to claim 5 or 6,
The mattress forms a rectangular plane with one side in the column direction and the other side in the row direction,
at least part of the groove is formed along the column direction,
The mattress unit is formed by arranging the mattresses so that the ends in the row direction are in contact with each other.

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