US20170325594A1

US20170325594A1 - Mattress

Info

Publication number: US20170325594A1
Application number: US15/310,588
Authority: US
Inventors: Hideyuki Nishimura; Taiji TAKAYAMA; Tadanori KUBO
Original assignee: SLEEP SELECT Co Ltd
Current assignee: SLEEP SELECT Co Ltd
Priority date: 2015-01-28
Filing date: 2015-01-28
Publication date: 2017-11-16
Also published as: CN106535715B; JPWO2016121027A1; JP5879009B1; CN106535715A; WO2016121027A1

Abstract

[Problem] The present invention provides the mattress which can fix a plurality of mattresses stably.

[Solution] A mattress comprises a first mattress 10, a second mattress 20 stacked on the first mattress, and a fixing member 30 fixing the first mattress and the second mattress. The fixing member comprising a first belt 31 attached to a side surface of the first mattress, a second belt 33 having a first fixing part and the second fixing part fixed to a lower end part and an upper end part in a side surface of the second mattress, respectively, and a connecting tool 34 passed to the second belt and moving from the upper end part to the lower end part in the side surface of the second mattress. The first mattress and the second mattress are fixed by passing the first belt to the first connecting tool.

Description

TECHNICAL FIELD

The present invention relates to a plurality of mattresses stacked.

BACKGROUND ART

Conventionally, when stacking a plurality of mattresses, the mattresses are merely stacked without fixing mattresses, and are fixed the four corners of the mattress by rubber.

PRIOR ART REFERENCE

Patent Reference

Patent reference 1: Jpn. Pat. Appln. KOKAI Publication No. 2011-229623
Patent reference 2: Jpn. Pat. Appln. KOKAI Publication No. 2002-315651

SUMMARY OF INVENTION

Problem to be Solved by Invention

However, gap arises only by stacking a plurality of mattresses. If the four corners of a mattress are fixed by rubber, feeling of pressure will arise. Thus, it is difficult to fix a plurality of mattresses stably and comfortably use the mattresses.
Then, the present invention provides the mattress which can fix a plurality of mattresses stably.

Means for Solving Problem

A mattress according to one embodiment of the present invention comprising a first mattress, a second mattress stacked on the first mattress, and a fixing member fixing the first mattress and the second mattress, the fixing member comprising a first belt attached to a side surface of the first mattress, a second belt having a first fixing part and a second fixing part, the first fixing part fixed to a lower end part in a side surface of the second mattress, and the second fixing part fixed to an upper end part in the side surface of the second mattress, and a first connecting tool passed to the second belt and moving from the upper end part to the lower end part in the side surface of the second mattress, the first mattress and the second mattress fixed by passing the first belt to the first connecting tool.

Effect of Invention

The present invention can provide the mattress which can fix a plurality of mattresses stably.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 The top view shows the mattress stacked in two-stage according to a first embodiment.

FIG. 2 The side view shows the mattress stacked in two-stage according to the first embodiment.

FIG. 3 The figure shows the state at the time of separation of the mattress stacked in two-stage of FIG. 2.

FIG. 4 The figure shows a state when the mattress stacked in two-stage of FIG. 2 is turned over.

FIG. 5 The front view shows the mattress stacked in two-stage at the time of fixing according to the first embodiment.

FIG. 6 The side view shows the mattress stacked in two-stage at the time of fixing according to the first embodiment.

FIG. 7 The enlarged view shows the mattress stacked in two-stage at the time of separation according to the first embodiment.

FIG. 8 The side view shows the mattress stacked in two-stage at the time of separation according to the first embodiment.

FIG. 9 The side view shows the mattress stacked in three-stage according to a second embodiment.

FIG. 10 The figure shows a state when the mattress stacked in three-stage of FIG. 9 is separated and it turns over.

FIG. 11 The front view shows the mattress stacked in three-stage at the time of fixing according to the second embodiment.

FIG. 12 The side view shows the mattress stacked in three-stage at the time of fixing according to the second embodiment.

FIG. 13 The front view shows the mattress stacked in three-stage at the time of attachment and detachment according to the second embodiment.

FIG. 14 The side view shows the mattress stacked in three-stage at the time of attachment and detachment according to the second embodiment.

FIG. 15 The front view shows the mattress stacked in three-stage at the time of separation according to the second embodiment.

FIG. 16 The side view shows the mattress stacked in three-stage at the time of separation according to the second embodiment.

FIG. 17 The side view shows the mattress stacked in four or more stage according to the second embodiment.

FIG. 18 The side view shows the mattress stacked in four or more stage according to the second embodiment.

FIG. 19 The front view shows the mattress stacked in three-stage at the time of fixing according to a third embodiment.

FIG. 20 The side view shows the mattress stacked in three-stage at the time of fixing according to the third embodiment.

FIG. 21 The front view shows the mattress stacked in three-stage at the time of attachment and detachment according to the third embodiment.

FIG. 22 The side view shows the mattress stacked in three-stage at the time of attachment and detachment according to the third embodiment.

FIG. 23 The front view shows the mattress stacked in three-stage at the time of separation according to the third embodiment.

FIG. 24 The side view shows the mattress stacked in three-stage at the time of separation according to the third embodiment.

FIG. 25 The side view shows the mattress stacked in four or more stage according to the third embodiment.

FIG. 26 The side view shows the mattress stacked in four or more stage according to the third embodiment.

MODES FOR CARRYING OUT INVENTION

Hereinafter, referring to an attached drawing, it describes about an embodiment. In the following descriptions, a common reference mark is attached about the element which has the same function and composition.

[1] First Embodiment

The first embodiment is an example at the time of making a mattress into a stacked two-stage.

[1-1] Entire Structure

FIG. 1 and FIG. 2 show the top view and the side view of the mattress stacked in two-stage according to a first embodiment. Hereinafter, it describes about the entire structure of the mattress stacked in two-stage according to a first embodiment.
As shown in FIG. 1 and FIG. 2, in the first embodiment, the two mattresses 10 and 20 are stacked, and the mattresses 10 and 20 are fixed with the fixing member 30.
The mattress 10 comprises the spring part 10 a which has a plurality of springs and the cushion part 10 b. The spring part 10 a and the cushion part 10 b have the structure of a common mattress.
The mattress 20 comprises a cushion part and has thickness of about the same as the cushion part 10 a of the mattress 10.
Every two fixing members 30 are provided by the both side surfaces in the longitudinal direction of the mattresses 10 and 20, respectively, and are fixing the mattresses 10 and 20 at four places, for example. However, a fixed place is not limited to the position or number to illustrate, but can be changed variously. It is desirable that the distance D from the end of the side surface of the mattresses 10 and 20 to the fixing member 30 is equal to each other.

[1-2] Reversible Function

FIG. 3 shows the state at the time of separation of the mattress stacked in two-stage of FIG. 2, and FIG. 4 shows a state when an upper mattress (topper is called hereafter) is over turned among the mattresses stacked in two-stage of FIG. 2. Hereinafter, it describes about the reversible function of the mattress stacked in two-stage according to the first embodiment.
As shown in FIG. 3 and FIG. 4, the topper 20 can be turned over and used. That is, the topper 20 can also use the A surface as the front surface, and the B surface as the front surface.
The front surface and the back surface (the A surface and the B surface) have a different material of resilience, breathability, and moisture retention, for example. The topper 20 has low rebounding, high rebounding, an object for summer, an object for winter, etc. Thereby, the topper 20 is usable in reversible according to liking of a season and a user.

[1-3] Fixing and Separation Method

FIG. 5 and FIG. 6 show the enlarged view of the mattress stacked in two-stage at the time of fixing according to the first embodiment. FIG. 7 and FIG. 8 show the enlarged view of the mattress stacked in two-stage at the time of separation according to the first embodiment. Hereinafter, it describes about the fixing and the separation method of the mattress stacked in two-stage according to the first embodiment.
As shown in FIG. 5 and FIG. 6, the fixing member 30 for fixing when the mattress 10 and the topper 20 are stacked, is provided. The fixing member 30 has the belts 31 and 33 and the ring (connecting tool) 34.
The belt 31 is attached to the side surface of the mattress 10. The one end of the belt 31 is fixed to the lower end part (fixing part 11) in the side surface of the cushion part 10 b of the mattress 10. The length of the belt 31 has a desirable degree (for example, about 2 times of the thickness of the cushion part 10 b of the mattress 10) which can be folded back through the ring 34.
Velcro 32 a and 32 b is provided by the surface of the both ends of the belt 31, respectively. As for Velcro 32 a provided near the fixing part 11 of the belt 31, it is desirable for area to be wider than Velcro 32 b provided near the end of the belt 31. Instead of Velcro 32 a and 32 b, it may be any fixable member, such as a snap button.
The belt 33 is attached to the side surface of the topper 20. One end of the belt 33 is fixed to the lower end part (fixing part 21) in the side surface of the topper 20, and the other end of the belt 33 is fixed to the upper end part (fixing part 22) in the side surface of the topper 20.
The fixing method of the belts 31 and 33 may be sewn in to the tape edge of the mattress 10 and the topper 20, and may be fixed with a tag pin etc., for example. As the belts 31 and 33, cloth, vinyl, leather, etc. are used, for example.
The ring 34 is passed through the belt 33 of the topper 20. The ring 34 is movable and it can move it freely from the upper end part (fixing part 22) to a lower end part (fixing part 21) in the side surface of the topper 20. The ring 34 consists of a buckle material (for example, iron and a nickel plate), a plastic, a synthetic resin, etc., for example. The ring 34 may be in any shape, such as a square, a rectangle, a hexagon, a circle, and an ellipse, for example. Although one ring 34 is provided to the one belt 33, the ring 34 may be provided two or more to strengthen more.
As shown in FIG. 7 and FIG. 8, Velcro 32 a and 32 b of the belt 31 of the mattress 10 are peeled and the belt 31 is removed from the ring 34 at the time of separation of the mattress 10 and the topper 20. When using the B surface of the topper 20 as the front surface, the topper 20 is turned over, the belt 31 is passed through the ring 34 and is fixed by Velcro 32 a and 32 b. At this time, because the ring 34 of the fixing member 30 can move the belt 33 freely up and down, even if turn over the topper 20, the position which fixes the mattress 10 and the topper 20 does not change.

[1-4] Effect

According to the first embodiment, when the mattress 10 and topper 20 are stacked into two-stage, by fixing the mattress 10 and the topper 20 with the fixing member 30, generating of gap is inhibited and more stable use is enabled.
Even if the topper 20 is turned over, the ring 34 passed to the belt 33 can move to go up and down freely, and the mattress 10 and the topper 20 can be fixed. Thus, also when the topper 20 is usable in reversible, the mattress 10 and the topper 20 can be stably fixed by using the ring 34 of working.
The topper 20 can be used reversibly in the front surface and the back surface. That is, it can turn over by removing the fixing member 30, and can use it stably. For this reason, the adjustment according to hardness and a season can be used by using the cushion with which hardness and breathability etc. are different in the front surface and the back surface of the topper 20.
In the first embodiment, the state (the state of using the A surface, and the state of using the B surface) which attached the topper 20, and the state which the topper 20 is removed, three kinds of feeling in bed can be changed freely.
The mattress 10 and the topper 20 are fixed with the fixing member 30 at four places. By this, unlike the case of using the fastener and sewing of the whole circumference, it can reduce the feeling of pressure when sleeping and be used comfortably.
The topper 20 can be removed from the mattress 10. For this reason, another person is used as a mattress the removed topper 20 in different places. The removed topper 20 can be used separately to the mattress 10 of the body.
Since the conventional mattress is heavy, it is difficult to shade-dry. On the other hand, in the first embodiment, since the topper 20 is separable, it becomes easy to dry the topper 20.
When the topper 20 is exhausted, it can be used for a long time the mattress 10 itself by exchanging only the topper 20.

[2] Second Embodiment

The second embodiment is an example at the time of making a mattress into a stacked three-step. In the second embodiment, it mainly describes about a different point from the first embodiment.

[2-1] Entire Structure

FIG. 9 shows the side view of the mattress stacked in three-stage according to the second embodiment. FIG. 10 shows separation of the mattress stacked in three-stage of FIG. 9, and a state when it turns over. Hereinafter, it describes about the entire structure of the mattress stacked in three-stage according to the second embodiment.
As shown in FIG. 9 and FIG. 10, in the second embodiment, the three mattresses 10, 20, and 40 are stacked, and the mattresses 10, 20, and 40 are fixed with the fixing member 30.
Among the mattresses 10, 20, and 40, the two upper mattresses 20 and 40 (topper is called hereafter) can separate from the mattress 10, and can use by turning over. The topper 40 has structure which is different with the front surface and the back surface (A surface and B surface) like the topper 20 of the first embodiment. It is also possible to place the topper 40 directly on the mattress 10 by replacing the topper 20 and the topper 40.
Every two fixing members 30 are provided by the both side surfaces in the longitudinal direction of the mattress 10 and the topper 20 and 40, respectively, and are fixing the mattress 10 and the topper 20 and 40 at four places, for example. However, a fixed place is not limited to the position or number to illustrate, but can be changed variously. It is desirable that the distance D from the end of the side surface of the mattresses 10 and the topper 20 and 40 to the fixing member 30 is equal to each other.

[2-2] Fixing, Attachment and Detachment, and Separation Method

FIG. 11 and FIG. 12 show the enlarged view of the mattress stacked in three-stage at the time of fixing according to the second embodiment. FIG. 13 and FIG. 14 show the enlarged view of the mattress stacked in three-stage at the time of attachment and detachment according to the second embodiment. FIG. 15 and FIG. 16 show the enlarged view of the mattress stacked in three-stage at the time of separation according to the second embodiment. Hereinafter, it describes about fixing of the mattress stacked in three-stage, attachment and detachment, and separation method according to the second embodiment.
As shown in FIG. 11 and FIG. 12, The fixing member 30 for fixing when the mattress 10 and the topper 20 and 40 are stacked, is provided. The fixing member 30 has the belts 31, 33, and 36 and the rings (connecting tool) 34 and 37.
The belt 31 is the same structure as the first embodiment. That is, one end of the belt 31 is fixed to the lower end part (fixing part 11) in the side surface of the cushion part 10 b of the mattress 10, and Velcro 32 a and 32 b is provided by the surface of the both ends of the belt 31, respectively.
The belt 33 is attached to the side surface of the topper 20. The belt 33 has the first portion 33 a, the second portion 33 b, and the center portion 33 c. The boundary part of the first portion 33 a and the center portion 33 c of the belt 33 is fixed to the lower end part (fixing part 21) in the side surface of the topper 20, and the boundary part of the second portion 33 b and the center portion 33 c of the belt 33 is fixed to the upper end part (fixing part 22) in the side surface of the topper 20. The length of the belt 33 has a desirable degree (for example, about 3 times of the thickness of the topper 20) which can be folded back through the rings 34 and 37.
Velcro 35 a and 35 c is provided to both sides of the first portion 33 a on the belt 33, respectively, Velcro 35 b is provided on the second portion 33 b, and Velcro 35 d is provided on the center portion 33 c. At the time of fixing, Velcro 35 a and 35 b is fixed, and Velcro 35 c and 35 d is fixed.
At the time of fixing, the end of the first portion 33 a of the belt 33 is fixed to near the fixing part 22 by Velcro 35 c and 35 d, and the end of the second portion 33 b of the belt 33 is fixed to near the fixing part 21 by Velcro 35 a and 35 b. That is, the belt 33 at the time of fixing has a three-layer structure which the center portion 33 c, the first portion 33 a, and the second portion 33 b stacked in order.
The belt 36 is attached to the side surface of the topper 40, and has the same structure as the belt 33. That is, the belt 36 has the first portion 36 a, the second portion 36 b, and the center portion 36 c. The boundary part of the first portion 36 a and the center portion 36 c of the belt 36 is fixed to the lower end part (fixing part 41) in the side surface of the topper 40, and the boundary part of the second portion 36 b and the center portion 36 c of the belt 36 is fixed to the upper end part (fixing part 42) in the side surface of the topper 40. The length of the belt 36 has a desirable degree (for example, about 3 times of the thickness of the topper 40) which can be folded back through the ring 37.
Velcro 38 a and 38 c is provided to both sides of the first portion 36 a on the belt 36, respectively, Velcro 38 b is provided on the second portion 36 b, and Velcro 38 d is provided on the center portion 36 c. At the time of fixing, Velcro 38 a and 38 b is fixed, and Velcro 38 c and 38 d is fixed.
At the time of fixing, the end of the first portion 36 a of the belt 36 is fixed to near the fixing part 42 by Velcro 38 c and 38 d, and the end of the second portion 36 b of the belt 36 is fixed to near the fixing part 41 by Velcro 38 a and 38 b. That is, the belt 36 at the time of fixing has a three-layer structure which the center portion 36 c, the first portion 36 a, and the second portion 36 b stacked in order.
The fixing method of the belts 31, 33, and 36 may be sewn in to the tape edge of the mattress 10 and the topper 20 and 40, and may be fixed with a tag pin etc., for example. As the belts 31, 33, and 36, cloth, vinyl, leather, etc. are used, for example.
The ring 37 is passed through the belt 36 of the topper 40. The ring 37 is movable and it can move it freely from the upper end part (fixing part 42) to a lower end part (fixing part 41) in the side surface of the topper 40.
As shown in FIG. 13 to FIG. 16, Velcro 32 a and 32 b of the belt 31 of the mattress 10 are peeled and the belt 31 is removed from the ring 34 at the time of separation of the mattress 10 and the topper 20 and 40. Velcro 35 a, 35 b, 35 c, and 35 d of the belt 33 of the mattress 20 are peeled and the belt 33 is removed from the ring 37. For example, when using the B surface of the topper 40 as the front surface, the topper 40 is turned over, the belt 33 is passed through the ring 37, and is fixed by Velcro 35 a, 35 b, 35 c, and 35 d. At this time, because the ring 37 of the fixing member 30 can move the belt 36 freely up and down, even if turn over the topper 40, the position which fixes the topper 20 and 40 does not change.

[2-3] Effect

It not only can obtain the same effect as the first embodiment of the above, but according to the second embodiment, it can obtain the still more nearly following effects.
According to the second embodiment, the mattresses 10, 20, and 40 are stacked three steps. For this reason, the two topper 20 and 40 can be used removing it, and this two topper 20 and 40 can be arranged horizontally, and it can be used as a mattress of double size.
The belts 33 and 36 of the topper 20 and 40 are the same structures. By this, the state which attached the topper 20 on the mattress 10 (the state of using the A surface and the state of using the B surface of the topper 20), the state (the state of using the A surface and the state of using the B surface of the topper 40) which attached the topper 20 and 40 on the mattress 10, and the state where the topper 20 and 40 is removed, five kinds of feeling in bed can be changed freely. In the second embodiment, as shown in FIG. 17 and FIG. 18, it is also possible to stack a mattress on four or more steps.

[3] Third Embodiment

The third embodiment is a modification of the second embodiment and how to fix the belts 33 and 36 of the fixing member 30 differs. In the third embodiment, it mainly describes about a different point from the first and the second embodiments.

[3-1] Fixing, Attachment and Detachment, and Separation Method

FIG. 19 and FIG. 20 show the enlarged view of the mattress stacked in three-stage at the time of fixing according to the third embodiment. FIG. 21 and FIG. 22 show the enlarged view of the mattress stacked in three-stage at the time of attachment and detachment according to the third embodiment. FIG. 23 and FIG. 24 show the enlarged view of the mattress stacked in three-stage at the time of separation according to the third embodiment. Hereinafter, it describes about fixing of the mattress stacked in three-stage according to the third embodiment, attachment and detachment, and separation method.
As shown in FIG. 19 to FIG. 24, in the third embodiment, a different point from the second embodiment is a fixing method of the belts 33 and 36. At the third embodiment, the end of the first portion 33 a and the end of the second portion 33 b of the belt 33 are fixed to the center of the center portion 33 c by Velcro 35 a, 35 b, 35 c, and 35 d and the end of the first portion 36 a and the end of the second portion 36 b of the belt 36 are fixed to the center of the center portion 36 c by Velcro 38 a, 38 b, 38 c, and 38 d at the time of fixing of a mattress. The belts 33 and 36 are stacked in two-layer at the time of fixing of the mattress 10 and the topper 20 and 40. The length of the belts 33 and 36 has a desirable degree (for example, about 2 times of the thickness of the topper 20 and 40) which can be folded back through the rings 34 and 37.
Velcro 32 a and 32 b of the belt 31 of the mattress 10 are peeled and the belt 31 is removed from the ring 34 at the time of separation of the mattress 10 and the topper 20 and 40. Velcro 35 a, 35 b, 35 c, and 35 d of the belt 33 of the mattress 20 are peeled and the belt 33 is removed from the ring 37. For example, when using the B surface of the topper 40 as the front surface, the topper 40 is turned over, the belt 33 is passed through the ring 37, and is fixed by Velcro 35 a, 35 b, 35 c, and 35 d. At this time, because the ring 37 of the fixing member 30 can move the belt 36 freely up and down, even if turn over the topper 40, the position which fixes the topper 20 and 40 does not change.

[3-2] Effect

It not only can obtain the same effect as the above the first and the second embodiments, but according to the third embodiment, it can obtain the still more nearly following effects.
According to the third embodiment, the belts 33 and 36 have stacked in two-layer at the time of fixing of the mattress 10 and the topper 20 and 40. For this reason, rather than the second embodiment stacked in three-layer, the fixing member 30 can be downsized and fine sight nature can also improve.
In the third embodiment, as shown in FIG. 25 and FIG. 26, it is also possible to stack a mattress on four or more steps.
Although the embodiments of the present invention are described, these embodiments are shown as an example and limiting the scope of invention does not have intention of them. These new embodiments can be carried out with other various forms, are the ranges which do not deviate from the summary of invention, and versatility can omit and replace them and they can be changed.

DESCRIPTION OF REFERENCE NUMERALS

10 Mattress
11, 21, 22, 41, and 42 Fixing part
20 and 40 Topper (mattress)
30 Fixing member
31, 33, and 36 Belt
32 a, 32 b, 35 a, 35 b, 35 c, 35 d, 38 a, 38 b, 38 c, and 38 d Velcro
34 and 37 Ring.

Claims

1: A mattress comprising

a first mattress,

a second mattress stacked on the first mattress and being usable in reversible, and

a fixing member fixing the first mattress and the second mattress,

the fixing member comprising

a first belt having one end fixed to a lower end part of a side surface of the first mattress,

a second belt having a first fixing part and a second fixing part, the first fixing part fixed to a lower end part in a side surface of the second mattress, and the second fixing part fixed to an upper end part in the side surface of the second mattress,

a first connecting tool passed to the second belt and moving from the upper end part to the lower end part in the side surface of the second mattress, the first mattress and the second mattress fixed by passing the first belt to the first connecting tool, and

a first member attached to the first belt, the first belt folded back on the outside through the first connecting tool near the first fixing part or the second fixing part of the second belt, and the first member for fixing in overlapping the folded first belt on the side surface of the first mattress, and

wherein the one end and the other end of the first belt are fixed on the lower end parts of the side surface of the first mattress by the first member when fixing the first mattress and the second mattress.

2: The mattress according to claim 1, further comprising

a third mattress stacked on the second mattress and being usable in reversible, and

wherein the fixing member fixes the first mattress, the second mattress, and the third mattress,

the second belt has a first portion, a second portion, and a first center portion placed between the first portion and the second portion,

the first fixing part is placed at a boundary of the first portion and the first center portion,

the second fixing part is placed at a boundary of the second portion and the first center portion,

at the time of fixing of the first to third mattresses, the second belt has a three-layer structure which the first portion and the second portion piled up on the first center portion, and

the fixing member further comprises

a second member attached to the second belt and for fixing in overlapping the first portion and the second portion on the first center portion,

a third belt having a third fixing part and a fourth fixing part, the third fixing part fixed to a lower end part in a side surface of the third mattress, and the fourth fixing part fixed to an upper end part in the side surface of the third mattress, and

a second connecting tool passed to the third belt and moving from the upper end part to the lower end part in the side surface of the third mattress, the second mattress and the third mattress fixed by passing the second belt to the second connecting tool.

3: The mattress according to claim 2, wherein the

third belt has a third portion, a fourth portion, and a second center portion placed between the third portion and the fourth portion,

the third fixing part is placed at a boundary of the third portion and the second center portion,

the fourth fixing part is placed at a boundary of the fourth portion and the second center portion,

at the time of fixing of the first to third mattresses, the third belt has a three-layer structure which the third portion and the fourth portion piled up on the second center portion, and

the fixing member further comprises a third member attached to the third belt and for fixing in overlapping the third portion and the fourth portion on the second center portion.

4: The mattress according to claim 1, further comprising

at the time of fixing of the first to third mattresses, an end of the first portion and an end of the second portion are fixed to a center of the first center portion, and

the fixing member further comprises

a second member attached to the second belt and for fixing the end of the first portion and the end of the second portion on the center of the first center portion,

5: The mattress according to claim 4, wherein the

at the time of fixing of the first to third mattresses, an end of the third portion and an end of the fourth portion are fixed to a center of the second center portion, and

the fixing member further comprises a third member attached to the third belt and for fixing the end of the third portion and the end of the fourth portion on the center of the second center portion.

6: The mattress according to claim 1, wherein the second mattress has a front surface and a back surface made of different materials.

7: The mattress according to claim 2, wherein the third mattress has a front surface and a back surface made of different materials.

8: The mattress according to claim 1, wherein a length of the first belt is twice a thickness of the first mattress.