JP6736822B2 - mattress - Google Patents

Description

The present invention relates to a mattress, and more particularly to a body pressure dispersion type mattress.

BACKGROUND ART Conventionally, a mattress that disperses body pressure and prevents bed sores is known for a bed that is provided for a person who can move by himself/herself but has some physical disability or inconvenience, or a person who needs some assistance to wake up. For example, see Patent Document 1).

According to Patent Document 1, moderate softness can be obtained for both heavy and light people, and pressure ulcers (bed sores) do not easily occur even when sleeping for a long time, and caregivers often sit on the edge of the mattress. Even with the object of providing a bed mattress that can be used for a long period of time without impairing the restorability, one of the front and back sides of the mattress body has a low-hardness foam layer and the other has a high-hardness foam. Disclosed is a laminated layer of front and back foam layers, which is reversible according to body weight.

However, since the mattress of Patent Document 1 has its entire front and back reversed, the user wants to change the feeling of recumbency for each body part, such as the head, buttocks, and feet. However, there is a problem in that the entire mattress needs to be replaced when the mattress "sinks" (dents) in each part of the body, resulting in cost increase. Furthermore, there is a problem that it is difficult to clean the mattress by itself in order to keep it clean.

JP 2002-223901 A

The present invention has been made in view of the problems as described above, and it is possible to change the feeling of recumbency for each part of the user's body and replace only that part when "sag (depression)" occurs. Furthermore, it is an object of the present invention to provide a mattress that prevents dampness during use, is easy to wash the inside, and is easy to drain and dry even after washing.

The present invention is grasped by the following configurations in order to achieve the above object.
(1) A first aspect of the present invention is a mattress capable of dispersing body pressure, comprising a plurality of mattress members that are divided in the longitudinal direction and can be used on the front and back sides separately, and each mattress member has a low hardness. A first layer portion having a first outer surface, and a second layer portion having a high hardness second outer surface provided to face the first layer portion. At least one of the second layer portions has, on the inner surface located on the other side, a first reverse groove portion extending in the width direction intersecting the longitudinal direction and opening at both ends, and both ends extending in the longitudinal direction. It is characterized by having at least one of the second reverse groove portions opened at.

(2) In the configuration of (1) above, the plurality of mattress members are composed of three mattress members corresponding to a user's head, buttocks and feet.

(3) In the configuration of (1) or (2), the first outer surface of the first layer portion is formed by an uneven portion extending at a predetermined interval in the width direction, and the second layer portion of the second layer portion is formed. The second outer surface is a flat surface.

(4) In the configuration according to any one of (1) to (3) above, a plurality of the first reverse groove portions having a substantially M-shaped cross section in the width direction are provided, and the center in the longitudinal direction. The first reverse groove portion in the region has a lower groove height with respect to the first inner surface located closer to the second layer portion than the first reverse groove portion in the peripheral region.

(5) In the configuration of any one of (1) to (4) above, a plurality of the second reverse groove portions are provided in the peripheral region sandwiching the central region in the width direction in the longitudinal direction.

(6) In the configuration according to any one of (1) to (5) above, the first layer portion and the second layer portion are provided so as to be sandwiched between the respective end portions in the width direction. An end sitting position supporting portion having a third reverse groove portion that is open at both ends in the width direction and extends at the position corresponding to the first reverse groove portion is provided.

(7) In the configuration of (6) above, the end sitting support portion is configured to include a material having a higher hardness than the first layer portion and the second layer portion.

(8) In the configuration according to any one of (1) to (7), further, an inner cover that wraps each mattress member, and a main body cover that puts the mattress members wrapped in the inner cover side by side in the longitudinal direction. Equipped with.

(9) In any one of the configurations (1) to (8), the first layer portion and the second layer portion have a single-layer structure or a multi-layer structure.

According to the present invention, it is possible to change the feeling of recumbency for each part of the user's body, and when "sagging (concave)" occurs, only that part can be replaced. It is possible to provide a mattress that prevents basket build-up, easily cleans the inside, easily drains water even after washing, and easily dries.

It is a perspective view showing an example of arrangement of a plurality of divided mattress members about a mattress concerning an embodiment of the present invention. It is a figure which shows one mattress member, (a) is a top view, (b) is a side view, (c) is a front view. It is a figure which shows the 1st layer part which comprises a mattress member, (a) is a top view, (b) is a side view, (c) is a front view. It is a figure which shows the 2nd layer part which comprises a mattress member, (a) is a top view, (b) is a side view, (c) is a front view. It is a figure which shows the end sitting position support part which comprises a mattress member, (a) is a top view, (b) is a side view, (c) is a front view. It is a figure which shows the state which the user was sitting on the edge sitting support part. It is a figure which shows the state which wrapped the mattress member in the inner cover. It is a figure which shows the state which accommodated the mattress in the main body cover and folded it. It is a perspective view which shows the other example of arrangement|positioning of the several divided|segmented mattress member corresponding to FIG. It is a figure explaining replacing a divided mattress member partially.

Hereinafter, modes for carrying out the present invention (hereinafter, referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. The same elements are denoted by the same numbers throughout the description of the embodiments. In addition, the vertical direction from the head to the feet when the user is lying down is the longitudinal direction, and the lateral direction when the user lies down is the width direction that intersects the longitudinal direction.

(Overall structure of mattress)
The mattress 1 according to the present embodiment can disperse body pressure, and each of the plurality of divided mattress members 10 is wrapped in an inner cover 20, and the mattress member 10 is placed in one main body cover 30 in the longitudinal direction. It is configured to be put side by side. In FIG. 1, the inner cover 20 and the main body cover 30 are omitted for convenience of description. The inner cover 20 and the body cover 30 will be described later again.

Each mattress member 10 can be used so that the front and back sides can be used (reversible), and has front and back sides with different hardness, as described later. FIG. 1 shows an example in which the mattress member 10 is divided into three parts, an upper mattress member 10a, a middle mattress member 10b, and a lower mattress member 10c. Regarding the recumbent surface of each mattress member 10, the upper mattress member 10a is shown. The middle mattress member 10b has a relatively low hardness first outer surface 40a, and the lower mattress member 10c has a relatively high hardness second outer surface 50a.

The number of divisions of the mattress member 10 is not limited to three divisions, and may be two divisions or four or more divisions. For example, in the case of three divisions as shown here, assuming that the user is a standard adult, the upper mattress member 10a is mainly on the head, the middle mattress member 10b is mainly on the buttocks, and the lower mattress member is. 10c mainly corresponds to the foot, respectively. Incidentally, when the mattress member 10 is divided into four parts, the four mattress members 10 can correspond to the head, the abdomen, the buttocks, and the legs in order from the top. In the present embodiment, the divided mattress members 10 have the same configuration, but the configuration of the mattress member 10 will be described below.

(Outline of mattress material)
As shown in FIGS. 1 and 2, the mattress member 10 includes a first layer portion 40 and a second layer portion 50 facing the first layer portion 40. Further, in the present embodiment, the end sitting support portion 60 is further sandwiched between both end portions 41 in the width direction of the first layer portion 40 and both end portions 51 in the width direction of the second layer portion 50. Is provided. The first layer portion 40, the second layer portion 50, and the end sitting position support portion 60 are bonded to each other on their contact surfaces.

The first layer portion 40 has a relatively low hardness first outer surface 40a, and the second layer portion 50 has a relatively high hardness second outer surface 50a. When the first outer surface 40a of the first layer portion 40 is a recumbent surface, a soft texture is given to the user, and when the second outer surface 50a of the second layer portion 50 is a recumbent surface, it is given to the user. It can give a solid texture and is configured to be used on the front and back. In the present embodiment, as will be described later in detail, the first outer surface 40a is formed in a concave-convex shape (slit shape) and the second outer surface 50a is formed in a planar shape, thereby achieving relative hardness.

The end sitting support part 60 has a higher hardness than the first layer part 40 and the second layer part 50 in order to prevent the user from falling down and becoming difficult to stand up when the user sits on the left and right sides of the bed. It is composed of materials. The constituent elements of the mattress member 10 will be described below.

(First layer part)
First, the first layer portion 40 will be described with reference to FIGS. 3A, 3</b>B, and 3</b>C in addition to FIGS. 1 and 2. The 1st layer part 40 has the uneven|corrugated|grooved part 42 extended in the width direction at the 1st outer surface 40a at a predetermined space|interval. The first layer portion 40 is made of urethane foam having a medium hardness, but the irregularities 42 cause the first outer surface 40a to have a relatively low hardness, so that the user's body is gently wrapped. A recumbent surface can be provided.

In FIG. 3B, the concave-convex portion 42 shows an example including 22 convex portions 42a and 21 concave portions 42b between them, but the number and arrangement of the convex portions 42a and the concave portions 42b may be different. The layout and the width and height of the convex portions 42a and the concave portions 42b may be set so that a desired low hardness can be obtained. Here, the convex portions 42a and the concave portions 42b are uniformly arranged except for both ends of the concave-convex portion 42. At both ends, in consideration of the balance between the entire length of the mattress member 10 in the width direction and the width of the uneven portion 42, the most protruding portion 42a of the uneven portion 42 is thicker than the other, and one is closer to the center than the leading edge. The protrusions 42a are thinner than the others and are respectively formed.

A surface opposite to the first outer surface 40a of the first layer portion 40, that is, a first inner surface 40b located on the second layer portion 50 side, has a first reverse extending in the width direction and opening at both ends. A groove 43 is provided. The first reverse groove portion 43 has an effect that moisture is unlikely to be trapped when the user lies down and uses the mattress 1, and the first reverse groove portion 43 is easily dried. Further, even when the mattress 1 is washed for each mattress member 10, the inside can be easily washed, and even after washing, the water can be easily drained and dried.

Here, an example is shown in which a plurality of grooves having a substantially M-shaped cross section are provided as the first reverse groove portion 43. Here, six first reverse groove portions 43 are provided, but the number thereof is not limited to six and can be any desired number. The cross section of the first reverse groove portion 43 is formed in a substantially M-shape, and a part of the body pressure is supported by the central portion of the M-shape so that the mattress member 10 is prevented from being excessively depressed. Further, the first reverse groove portions 43 (two near the center in the figure) in the central region in the longitudinal direction are first in comparison with the first reverse groove portions 43 (two left and right two in the figure, a total of four) in the peripheral region. It is configured to have a low groove height with respect to the inner surface 40b. Also in this case, the mattress member 10 contributes to a direction in which "sagging" in which the mattress member 10 is deformed and does not return to its original state due to long-term use is suppressed in the central region in the longitudinal direction.

As shown in FIG. 3C, the first inner surface 40b of the first layer portion 40 is provided with a plurality of second reverse groove portions 44 extending in the longitudinal direction and opening at both ends. The second reverse groove portion 44, together with the first reverse groove portion 43, contributes to a ventilation hole during use and drainage during washing. Here, an example in which a plurality of grooves having an inverted U-shaped cross section are provided as the second reverse groove portion 44 is shown. In the figure, ten second reverse groove portions 44 are provided, but the number thereof is not limited to ten and may be any desired number. The second reverse groove portion 44 is provided in the peripheral area sandwiching the central area in the width direction, and this prevents the central area corresponding to the midline of the user from being excessively depressed (so-called “bottomed”). It is a thing.

At both ends in the width direction of the first layer portion 40, end portions 41 extending in the width direction are provided on the first outer surface 40a side. An end sitting support portion 60, which will be described later, is attached to the lower surface of the end portion 41. A fourth groove portion 45 that extends in the longitudinal direction across the uneven portion 42 is provided near the center of the end portion 41 of the first outer surface 40a. The fourth groove portion 45 serves as a mark for visually indicating that the end seating support portion 60 is provided below the end portion 41, and at the same time, the fourth groove portion 45 is provided on the first layer portion 40 and the end portion 41 of the first layer portion 40. This contributes to sharpening the difference in hardness from the covered end sitting support 60. When the fourth groove 45 is provided, the hardness of the end sitting support 60 covered by the end 41 of the first layer 40 can be increased by about 10% as a whole, as compared with the case where the fourth groove 45 is not provided.

(Second layer portion)
Next, the second layer portion 50 will be described with reference to FIGS. 4A, 4B, and 4C in addition to FIGS. 1 and 2. The second layer portion 50 has a second outer surface 50a formed by a flat surface. The second outer surface 50a is composed of a flat surface of urethane foam of medium hardness, whereas the first outer surface 40a of the first layer portion 40 is composed of the uneven portion 42, and thus the second outer surface 50a is composed of the first outer surface. The hardness is relatively high with respect to 40a. As a result, the second outer surface 50a can suppress the depression of the body of the reclining user and provide a firm recumbent surface that is easy to turn over.

The second inner surface 50b of the second layer portion 50 is provided with a plurality of fifth groove portions 52 extending in the longitudinal direction and opening at both ends. The fifth groove portion 52 is provided facing the left and right ends of the second reverse groove portion 44 of the first layer portion 40. The fifth groove portion 52, together with the second reverse groove portion 44, contributes to a ventilation hole during use and drainage during washing, and also applies an adhesive between the first layer portion 40 and the second layer portion 50. It is also useful as a place marker. Here, as the fifth groove portion 52, two grooves having a U-shaped cross section are provided corresponding to the left and right ends of the second reverse groove portion 44, but the number is not limited to two and may be any desired number. It may be a number.

Ends 51 extending in the width direction are provided on both ends in the width direction of the second layer portion 50 on the side of the second outer surface 50a. An end sitting support portion 60, which will be described later, is attached to the upper surface of the end portion 51. Although not shown here, since it plays the same role as the fourth groove portion 45 provided in the first layer portion 40, the second outer surface is closer to the center of the end portion 51 of the second outer surface 50a. A reverse groove may be provided that extends in the longitudinal direction across 50a.

(End sitting position support)
Next, with reference to FIGS. 5A, 5B, and 5C in addition to FIGS. 1 and 2, the end sitting position support portion 60 will be described. In the present embodiment, in addition to the first layer portion 40 and the second layer portion 50, at the left and right ends thereof, the width direction end portion 41 of the first layer portion 40 and the width direction end portion of the second layer portion 50. You may make it provide the edge sitting position support part 60 provided so that it might be pinched|interposed by 51. The end sitting support portion 60 includes a base layer 61 and a support layer 62 bonded to the upper surface of the base layer 61. The base layer 61 may be formed of high-hardness urethane foam, non-woven fabric, or the like.

The lower surface 61a of the base layer 61 is provided with a third reverse groove portion 63 that is located at a position corresponding to the first reverse groove portion 43 of the first layer portion 40 and that extends in the width direction and is open at both ends. The third reverse groove portion 63 communicates with the first reverse groove portion 43 of the first layer portion 40, and even when the end sitting position support portion 60 is attached to the mattress member 10, the user lies down and uses the mattress 1. It has the effect of making it difficult for moisture to be trapped during drying and easily drying. Further, even when the mattress 1 is washed for each mattress member 10, the inside can be easily washed, and even after washing, the water can be easily drained and dried.

Here, six third reverse groove portions 63 are provided corresponding to the first reverse groove portions 43 of the first layer portion 40, and the number increases or decreases depending on the number of the first reverse groove portions 43. The third reverse groove portion 63 is provided so as to cover the width direction of the opening of the first reverse groove portion 43.

A support layer 62 is provided on the upper surface of the base layer 61. The support layer 62 is formed by compressing a non-woven fabric so as to be a material harder than the base layer 61 and the first layer portion 40 and the second layer portion 50. For example, a 30 mm thick non-woven fabric layer is compressed to a thickness of 10 mm by hot pressing. As a result, as shown in FIG. 6, even when the user sits on the left and right ends of the mattress member 10, the waist is prevented from sinking, the end sitting position is stable, and the user stands up by supporting the weight when standing up. Will be easier.

(Inner cover and body cover)
Next, the inner cover 20 and the main body cover 30 will be described with reference to FIGS. 7 and 8. The inner cover 20 is formed in a bag shape that individually wraps the mattress member 10, and is made of synthetic resin such as polyester. The inner cover 20 is preferably formed of a breathable material such as a mesh in order to prevent stuffiness during use. Wrapping the mattress member 10 in the inner cover 20 improves the sliding property and facilitates the mattress member 10 to be taken in and out of the body cover 30.

The inner cover 20 has an opening (not shown) on one side in the longitudinal direction of the mattress 1, and the mattress member 10 is put in and taken out through the opening. The opening may be formed in an open state by stacking it without providing a fastener, or may be formed so as to be closable by providing a fastener. When the fastener is provided, it may be in the form of a fastener, a string, a hook, a safety pin, or the like.

The plurality of mattress members 10 are arranged, for example, in the arrangement as shown in FIG. 1, and are arranged side by side in the longitudinal direction in the main body cover 30 while being individually wrapped in the inner cover 20. The main body cover 30 is made of urethane synthetic leather, and is completely waterproof, so that even if the user has vomiting, blood exhalation, incontinence, drug leakage, etc., it is possible that these penetrate into the inside. Therefore, it is possible to implement safety measures such as infection prevention and hygiene measures such as odor prevention. It is also possible to wipe and disinfect with alcohol.

The main body cover 30 has an opening (not shown) on one side in the longitudinal direction of the mattress 1, and allows the plurality of mattress members 10 to be taken in and out through the opening. The opening is formed so as to be closable by providing a fastener, and the mode of the fastener may be any of a fastener, a string, a hook, a safety pin, and the like. A handle 31 is provided on at least one side in the longitudinal direction of the mattress 1 for the convenience of folding the mattress 1 for each mattress member 10 and carrying and adjusting the arrangement on the bed. FIG. 8 shows a state in which the middle mattress member 10b is taken out from the main body cover 30 and the upper mattress member 10a and the lower mattress member 10c are folded with the middle mattress member 10b sandwiched between the mattress member 10 divided into three parts. There is. Since the mattress 1 is folded in this manner, the mattress 1 can be made compact when not in use and space can be saved.

(Combination of mattress members)
As described above, in the mattress member 10, the first outer surface 40a of the first layer portion 40 provides a soft recumbent surface having a relatively low hardness, and the second outer surface 50a of the second layer portion 50 relatively. Since the firm recumbent surface having high hardness is provided, by changing the arrangement of the plurality of mattress members 10, it is possible to provide the recumbent surface for each site according to the preference of the user or the physical condition of the user. For example, FIG. 9 (the illustration of the inner cover 20 and the main body cover 30 is omitted as in FIG. 1) is different from FIG. 1 in that the recumbent surface of each mattress member 10 is an upper mattress member 10a and a lower mattress. In this example, the member 10c is the first outer surface 40a having a relatively low hardness, and the middle mattress member 10b is the second outer surface 50a having a relatively high hardness. As described above, in the mattress 1 of the present embodiment, the recumbent surface having different textures of the mattress member 10 can be freely selected for each body part according to the user's request.

Note that, as described above, the case of the mattress member 10 divided into three parts of upper/middle/lower is described here, but the number of divisions is not limited to three, and Of course, it is also possible to divide into two lower divisions or into four or more divisions of upper/middle upper/middle lower/lower.

Since the divided mattress members 10 can be handled individually, if dirt or odor adheres, only the mattress member 10 needs to be washed, and compared with washing the entire mattress 1, it can be washed. A series of washing processes such as rinsing, dehydration and drying become extremely easy. As a result, the mattress 1 can always be kept clean.

Further, as shown in FIG. 10, when the mattress 1 is used for a long period of time, the "corresponding to the buttocks" inevitably causes "sag" (dent), but in the case of the conventional single mattress 1'( As shown in FIG. 10(b), the "sag" (depression) spreads from around the buttocks to the periphery, and as a result, it becomes necessary to replace the entire mattress. On the other hand, in the mattress 1 (FIG. 10A) of this embodiment, the entire mattress 1 is used like a new one by replacing only the divided mattress member 10 (here, the middle mattress member 10b). It becomes possible to do. Further, by rotating the divided mattress members 10 and changing the position between upper/middle/lower, it is possible to delay the progress of “sagging (depression)”, and eventually, the life of the entire mattress 1 ( Durability) can also be extended.

(Modification)
In the above description, the example in which the first reverse groove portion 43 and the second reverse groove portion 44 are provided on the first inner surface 40b of the first layer portion 40 is shown, but the first reverse groove portion 43 and the second reverse groove portion 44 are It may be provided on the second inner surface 50b of the second layer portion 50, or may be provided on both the first inner surface 40b of the first layer portion 40 and the second inner surface 50b of the second layer portion 50. In short, at least one of the first layer portion 40 and the second layer portion 50 has the first reverse groove portion 43 and the second reverse groove portion 43 on the inner surface (the first inner surface 40b or the second inner surface 50b) located on the other side. It may be configured to have at least one of the groove portions 44. Even with such a configuration, the same effect as that of the first reverse groove portion 43 and the second reverse groove portion 44 described above can be obtained.

When the second reverse groove portion 44 is provided on the second inner surface 50b of the second layer portion 50, the fifth groove portion 52 is provided on the first inner surface 40b of the first layer portion 40. Also, when the second reverse groove portion 44 is provided on both the first inner surface 40b of the first layer portion 40 and the second inner surface 50b of the second layer portion 50, the fifth groove portions 52 should face each other. Will be absorbed as one of the second reverse groove portions 44.

Further, in the above description, the first layer portion 40 and the second layer portion 50 have been described as having a single layer structure, but each layer portion may have a multilayer structure. For example, the first layer portion 40 is divided into two layers, the outer surface of one layer is the first outer surface 40a, and the inner surface of the other layer located on the second layer portion 50 side is the first inner surface. It may be the surface 40b. Furthermore, when the first layer portion 40 is divided into three or more layers, the outer surface of one outer layer is the first outer surface 40a and the second layer portion 50 of the outer layer on the opposite side. The inner surface located on the side may be the first inner surface 40b. The same applies to the second layer portion 50. Therefore, the first layer portion 40 and the second layer portion 50 are selected from among a single layer structure/single layer structure, a single layer structure/multilayer structure, a multilayer structure/single layer structure, and a multilayer structure/multilayer structure for their combination. You can choose.

The present invention has been described above using the embodiments, but it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It is apparent to those skilled in the art that various changes or improvements can be added to the above-described embodiment. It is also apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention. For example, in the above embodiment, the relative hardness of the first outer surface 40a of the first layer portion 40 and the second outer surface 50a of the second layer portion 50 is achieved by the respective surface shapes, This may be achieved by making the material of each layer different.

DESCRIPTION OF SYMBOLS 1... Mattress 10... Mattress member 20... Inner cover 30... Main body cover 40... 1st layer part 40a... 1st outer surface 40b... 1st inner surface 41... End part 42... Uneven part 43... 1st reverse groove part 44... 2 Reverse groove part 45... 4th groove part 50... 2nd layer part 50a... 2nd outer surface 50b... 2nd inner surface 51... End part 52... 5th groove part 60... End sitting position support part 61... Base layer 62... Support layer 63... Third reverse groove

Claims (8)

A mattress that can disperse body pressure,
Divided in the longitudinal direction, equipped with multiple mattress members that can be used on the front and back separately
Each mattress member
A first layer portion having a first outer surface of low hardness;
A second layer portion provided opposite to the first layer portion and having a high hardness second outer surface,
At least one of the first layer portion and the second layer portion, on an inner surface located on the other side, a first reverse groove portion extending in a width direction intersecting the longitudinal direction and opening at both ends, and the longitudinal direction. extends in a direction have at least one of the second opposite groove which opens at both ends,
A plurality of the first reverse groove portions are provided having a substantially M-shaped cross section in the width direction, and the first reverse groove portion in the central region in the longitudinal direction is more than the first reverse groove portion in the peripheral region. A mattress characterized by having a low groove height with respect to a first inner surface located on the side of the two-layer part . A mattress that can disperse body pressure,
Divided in the longitudinal direction, equipped with multiple mattress members that can be used on the front and back separately
Each mattress member
A first layer portion having a first outer surface of low hardness;
A second layer portion provided opposite to the first layer portion and having a high hardness second outer surface,
At least one of the first layer portion and the second layer portion, on an inner surface located on the other side, a first reverse groove portion extending in a width direction intersecting the longitudinal direction and opening at both ends, and the longitudinal direction. extends in a direction have at least one of the second opposite groove which opens at both ends,
The mattress, wherein a plurality of the second reverse groove portions are provided in the peripheral area sandwiching the central area in the width direction in the longitudinal direction . A mattress that can disperse body pressure,
Divided in the longitudinal direction, equipped with multiple mattress members that can be used on the front and back separately
Each mattress member
A first layer portion having a first outer surface of low hardness;
A second layer portion provided opposite to the first layer portion and having a high hardness second outer surface,
At least one of the first layer portion and the second layer portion, on an inner surface located on the other side, a first reverse groove portion extending in a width direction intersecting the longitudinal direction and opening at both ends, and the longitudinal direction. extends in a direction have at least one of the second opposite groove which opens at both ends,
Further, it is provided so as to be sandwiched between the respective end portions in the width direction of the first layer portion and the second layer portion, and is opened at both ends in the width direction at a position corresponding to the first reverse groove portion. A mattress comprising an end sitting support portion having a third reverse groove portion extending . Wherein the plurality of mattress members, the head of the user, the mattress according to any one of claims 1 to 3, characterized in that it is composed of three mattress member corresponding to the buttocks and legs. The first outer surface of the first layer portion is configured by an uneven portion extending at a predetermined interval in the width direction, and the second outer surface of the second layer portion is configured by a flat surface. The mattress according to any one of claims 1 to 4 . The mattress according to claim 3 , wherein the end sitting position support portion is configured to include a material having a hardness higher than that of the first layer portion and the second layer portion. Further, the inner cover enveloping each mattress element, respectively, according to any one of the respective mattress element wrapped in the inner cover from claim 1, characterized in that it comprises a body cover put side by side in the longitudinal direction 6 Mattress. The mattress according to any one of claims 1 to 7 , wherein the first layer portion and the second layer portion have a single-layer structure or a multi-layer structure.

Images