JPH09121985A - Mattress - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mattress which gives a certain repulsive force as if floating in water at all times regardless of the size of the load applied. SOLUTION: A plurality of layers of foamed cushion material are laminated in such a way that the hardness is incremental from the over situated layer to the under, wherein slits directed from the oversurface to undersurface are provided in such an arrangement at least that one edge member of one slit is situated close to the end part of its adjoining slit. Each slit has an I-form or Y-form in the plan. At least the surface coming in contact with the user's body is covered with a side member made of a material expanding flexibly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mattress used for bedding.

[0002]

2. Description of the Related Art Conventionally, a flat mattress made of a multi-foam cushion material such as urethane foam has been known. However, when the mattress is soft when lying down on it, the lumbar part which is heavy is placed on the other part. The mattress had to be stiff because it would sink in comparison.

In the case of a hard mattress, when the mattress receives the weight of the body on it, the mattress around the body receiving portion is also pulled by the mattress receiving the body to be deformed, This is one of the causes that make the mattress uncomfortable because it causes a compression deformation different from the body weight distribution in the mattress.

Therefore, a structure has been developed in which a plurality of slits are formed in the mattress in the vertical direction to divide the mattress into small compartments, and each compartment independently supports each part of the body. It is necessary to have a characteristic that the repulsive force is increased in proportion to the depth of compression of the cushion material, that is, a vertical compression elastic characteristic with a constant spring rate, but when a single-layer cushion material is used, it is very expensive.

It is said that the correct posture at bedtime is the same as when a body having a specific gravity almost equal to the specific gravity of water floats out of the water when lying down in the water.
This is because the load on each part of the body and the buoyancy of water are balanced, so that when a sleeping person lays down on the bedclothes, the weight of the sleeping person is supported by the padding inside the bedclothes. 0.3g / mm ・ cm ² so that the vertical compressive repulsive elastic force and horizontal stretch repulsive elastic force of the filling material and the horizontal stretch repulsive elastic force of the side ground can obtain a supporting force that is 3 to 5 times the buoyancy of water. A constant spring rate of is desirable. Constant spring rate is "proportional" to load
And 0.3g / mm · cm ² by the characteristic shrunk to is a sense that is necessary to load of 0.3g to push down area around 1mm of 1cm ^2. Therefore, a force of 3 g is required to push down 10 mm. By the way, the buoyancy of water is 0.1g / mm ・ cm
²

As shown in the graph of FIG. 1, the buoyancy of water increases as the object sinks deeper. However, in the case of a foamed material such as a multi-cell cushion material such as urethane foam, as shown in FIG. The spring rate given to the object on it suddenly weakens when the mass of the object exceeds a certain point. Therefore, in mattresses that use urethane foam, it is not possible to take sufficient measures against load unless the above-mentioned sudden decrease in spring rate is used and hard ones are used, which also affects sleeping comfort. Was given. Further, as the depth of pressing and contracting increases, the horizontal rebound resilience of the filling material such as batting and the horizontal rebound resilience of the side ground suddenly increase, and a force is lifted from the surroundings.

[0007]

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to obtain a mattress having a constant spring rate such as when it is always floating in water regardless of the size of the load.

[0008]

In the laminated body, a plurality of multi-cell cushion materials having different hardnesses are laminated so that the hardness is gradually increased from an upper layer to a lower layer, and a plurality of slits oriented from the upper surface to the lower surface are formed at least. The slit was formed such that one side of the slit was close to the end of the adjacent slit. The slit has a planar shape of I-shape or Y-shape. Then, at least the surface on the side in contact with the body was covered with a side cloth made of a flexible cloth that exerts extensibility only in a portion subjected to the load.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the mattress 1 of the present invention will be described with reference to FIG. The mattress of Example 1 is a flat urethane foam 2 which is a multi-cell cushion material 2.
A, 2b, and 2c are laminated in three layers and integrated by surface adhesion or the like, and the hardness is changed by using a material whose hardness gradually increases from the uppermost first layer to the lower layer. As an example, when four layers are used, the results are shown in Table 1.

[0010]

[Table 1]

In the illustrated example, the slit 3 is formed through three layers. The slit 3 has a small circular bulge space 5 at both ends of a portion 4 in which the plane shape of one side is a straight line, and the plane shape is I-shaped, and is perpendicular to the plate-shaped urethane foams 2a, 2b, 2c. Extending in the direction. I above
The slit 3 having a letter shape is formed of urethane foam 2a, 2
Except for the outer circumferences of b and 2c, the bulge space 5 is close to the center of the straight line portion 4 on one side, and the two slits 3 and 3 are arranged so as to intersect on the extension line.

Therefore, the adjacent slits 3, 3
3 ... are not continuous with each other, and the four slits 3,
A columnar portion 6 of urethane foam is formed surrounded by 3 ... However, since the columnar portion 6 is in a state in which the linear portion 4 of the slit 3 and the bulging space 5 of the other slit 3 adjacent thereto are close to each other but not continuous, each of the columnar portions 6 has a certain degree. Although it is possible to freely perform load operation, and each is compressed independently,
In the case of trying to endure a compressive load and fall into a sideways fall or vertical cracking state, since the adjacent columnar portions 6 attract each other due to the fine continuous portion 7, it is easy to cause a sideways fallen vertical cracking state. Absent. The bulging space 5 does not necessarily have to be a void, and even if it is solid, it does not matter if the slit has an arcuate tip portion as shown in FIG. 7, for example.

In the laminated urethane foam having the slits 3 formed therein, a flat plate base 8 having no slits is integrally provided on the lowermost layer 2c. The flat plate-shaped base 8 prevents the slits in the layers above it from opening or changing inadvertently and causing the shape to collapse.

The plate-shaped base 8 can be made of a material selected as appropriate to enhance the shape retention property or the breathability and heat retention. For example, a continuous fibrous body as a material,
Alternatively, a flat plate-like support having a large porosity and an appropriate thickness, which is formed by three-dimensionally entangled linear bodies and fusing their contacts, is provided in the lowermost layer, so that between the mattress and the floor surface. Voids are formed, and due to the air permeability of the portion, moisture due to sweating during sleep is dissipated and the moisture does not condense under the mattress.

The second embodiment is shown in FIG. In the example shown in FIG. 5, the shape of the slit 3 is different from that of the first embodiment, and the others are the same. This example is a Y-shaped portion 10 in which one end of three sides is concentrated and the other end is radially opened, whereas the first embodiment is composed of a straight line portion 4 having one side, and a bulge space is provided at the tip of each side. 11 is composed. The bulging space 11 of the slit 3 adjacent to the intersection 12 of each side of the Y-shaped portion 10 is located. As a result, the columnar portion 13 surrounded by the arms of the slit 3 has a triangular shape.

The mattresses 1 of the first and second embodiments both have their lateral sides appropriately covered with a side cloth. However, if possible, a stretchable cloth is used for the side cloth to reduce the load. It should be possible to transfer the load directly to the mattress only at the applied part. If you use a non-stretchable side ground, the side ground around the part where the load is applied is also pulled toward the part where the load is applied, causing deformation of the mattress in a wide area, and the load is applied. It also reduces the effect of the mattress of the present invention of improving the sleeping comfort by producing the impact resilience according to the load at the position.
As an example of the side material, a plain weave, a twill weave, a satin weave, etc. using a cotton / polyurethane covering ring at a ratio of 1 out of 3 wefts with 100% cotton is preferable.

FIG. 6 is a graph showing the relationship between the bulkiness and the repulsive force when the mattress of the present invention is used. The figure shows a state in which five urethane foams are stacked. When the applied load is small, the uppermost layer urethane foam 2a receives the load first and begins to deform, and the repulsive force increases. At first, however, the deformation is small, but after a certain point, the repulsive force increases. Without being touched, the deformation becomes rapid, and the urethane foam 2b of the second layer bears the load.

Then, like the first layer, the repulsive force is increased with a small amount of deformation at the beginning, but as with the first layer, after a certain point, the deformation becomes steep without an increase in the repulsive force, Then, the urethane foam 2c of the third layer bears the load. This is repeated as many times as the number of laminated layers. Through the above process, the repulsive force as a whole has a gentle curve, that is, a gentle inclination, and the repulsive force in a state of floating in water as shown in FIG.

[0019]

As described above in detail, the present invention is formed by laminating a plurality of multi-foam cushion materials whose hardness is gradually increased from the upper layer to the lower layer, and a plurality of multi-foam cushion materials having different hardnesses are laminated from the upper layer. Layers were laminated so that the hardness gradually became lower toward the lower layer, and multiple slits facing from the upper surface to the lower surface were drilled with at least one side of the slits close to the ends of the adjacent slits. Regardless of
When the body floats on the water, the same repulsive force can be obtained, and it is possible to achieve both a soft sleeping comfort and an appropriate sleeping posture.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship between buoyancy and depth.

FIG. 2 is a graph showing a relationship between repulsive force and bulkiness.

FIG. 3 is a perspective view showing a cross section of the first embodiment of the mattress of the present invention.

FIG. 4 is a plan view showing a part of the first embodiment of the mattress of the present invention.

FIG. 5 is a plan view showing a part of a second embodiment of the mattress of the present invention.

FIG. 6 is a graph showing the relationship between the pressing force and bulkiness of laminated urethane.

FIG. 7 is a plan view showing deformation of the bulge space.

[Explanation of symbols]

 1 Mattress 2 Multi-bubble cushion material 3 Slit 4 Area where one side has a straight line shape 5,11 Bulging space 6,13 Columnar part 7 Fine continuous part 10 Y-shaped part 12 Crossing part

Front Page Continuation (72) Inventor Kenji Takagi 8-8 Nihonbashi Tomizawa-cho, Chuo-ku, Tokyo Nishikawa Sangyo Co., Ltd.

Claims (5)

[Claims] 1. A plurality of multi-cell cushion materials having different hardnesses are laminated so that the hardness increases from the upper layer to the lower layer,
A mattress having a plurality of slits directed from the upper surface to the lower surface of the laminate, at least one side of the slits being close to the ends of the adjacent slits. 2. The mattress according to claim 1, wherein the slit has one side and the planar shape is I-shaped. 3. The mattress according to claim 1, wherein the slit has three sides, the ends of each side are concentrated at one point, and the other end is radially opened to have a Y-shaped planar shape. 4. The mattress according to claim 2, wherein at least the surface on the side in contact with the body is covered with a side material made of a flexible cloth that exhibits extensibility only in a portion where a load is applied. 5. The mattress according to claim 2, wherein a swelling space is provided at an end of the slit.