JP7587621B2 - mattress - Google Patents

Description

The present invention relates to a mattress formed using a cushion body.

High-resilience mattresses that use a bonded body (filament three-dimensional bonded body) obtained by three-dimensionally fusing and bonding filaments made of thermoplastic resin as a cushion have been attracting attention in recent years. Mattresses that use filament three-dimensional bonded bodies have high resilience, making it easy to turn over in your sleep, and because they have excellent breathability and body pressure dispersion, they are less likely to become stuffy and provide a soft feel when you sleep on them. In this way, these mattresses have features that are essential for a comfortable sleep. In addition, because filament three-dimensional bonded bodies have a high porosity, they have the advantage of being easy to clean, as they can be quickly drained and dried even when washed with water.

A method for producing such a three-dimensional filament bond is disclosed in, for example, Patent Document 1. According to this method, molten thermoplastic resin is extruded vertically downward from multiple horizontally arranged nozzles, and then molten filaments with a diameter of about 1 mm are dropped into cooling water, where the buoyancy of the water forms loops, and the multiple molten filaments that have formed loops are fused and bonded together in three dimensions to produce a three-dimensional filament bond.

Patent No. 4966438

However, even though the three-dimensional filament bond is easy to clean, the mattresses often become large and heavy. This poses the problem that it is cumbersome to transport the mattress to the washing area and to drain and dry it. In particular, such tasks are often physically difficult for elderly people.

One possible solution to this problem is to form the mattress cushion so that it can be separated into multiple cushion bodies (which can be combined to form a single mattress cushion), and then store the mattress cushion in a mattress cover. With a mattress formed in this way, each cushion body is relatively compact, which reduces the hassle of the above work and makes the above work relatively easy for elderly people.

However, with mattresses formed using this method, gaps at the boundaries between the cushion bodies tend to widen. This problem will be explained below with reference to Figure 11. Figure 11 shows a schematic diagram of the widening of gaps at the boundaries between the cushion bodies for an example of a mattress formed using this method.

The mattress 500 shown in Figure 11 has three cushion bodies 521-523 arranged in the longitudinal direction housed in a mattress cover 510. As shown in Figure 11 (A), when the gap 520a between cushion body 521 and cushion body 522 is pressed by the user's limbs (e.g. elbows and knees), a problem occurs in which the limbs fall into the grooves formed there, as shown in Figure 11 (B). The softer the fabric of the upper surface of the mattress cover is made to achieve a softer sleeping experience, the more likely the gap 520a will widen and the more likely the limbs will fall into the grooves that are formed.

If the user's hands and feet fall into these grooves, it can cause discomfort to the user and result in an uncomfortable sleep. In view of the above problems, the present invention aims to provide a mattress that makes it difficult for hands and feet to fall into the grooves without compromising the soft sleeping comfort, and that makes cleaning easier.

The mattress according to the present invention comprises a mattress cushion that can be divided into multiple cushion bodies in the length direction, a mattress cover that contains the mattress cushion so that it can be inserted and removed through an opening, and an opening/closing member that opens and closes the opening, and in which a user can lie down with the opening closed, each of the multiple cushion bodies is formed into a rectangular parallelepiped shape using a resin filament three-dimensional bonded body with a smooth surface layer in which the filament density is higher at both ends in the thickness direction than at the center in the thickness direction, and the filament three-dimensional bonded body has a filament diameter of 0.5 to 2 mm and a bulk density of 30 to 150 kg/m3, the mattress cover is made up of a top cover and a bottom cover, at least one of the covers also surrounds the peripheral surface of the mattress cushion and functions as an extension prevention member that prevents the mattress cushion from extending in the length direction, and the opening is closed with the opening/closing member to contain the vertical surfaces of the cushion bodies adjacent to each other in the length direction in at least a pressure-bonded state.

This configuration makes it easier to clean the mattress by preventing knees, elbows, etc. from falling into the grooves without compromising the soft sleeping comfort.

The "length direction" here refers to the direction that is approximately perpendicular to the vertical direction and is the longest direction in the mattress (usually the same as the height direction of the user lying down). The peripheral surface of the mattress cover corresponds to the outer periphery (side surface) of the mattress cover when viewed from above.

More specifically, the above configuration may be such that the top cover covers the top surface of the mattress cushion and the upper side of the peripheral surface that continues to the top surface. More specifically, the mattress cushion may be configured to have at least two layers, an upper layer and an lower layer. More specifically, the above configuration may be such that the opening and closing member that opens and closes the opening is a zipper.

The mattress of the present invention makes it possible to prevent limbs from falling into the grooves without compromising the soft sleeping comfort, and makes cleaning easier.

FIG. 1 is a perspective view of a mattress according to a first embodiment. FIG. 2 is a perspective view of the mattress cover in the combined state according to the first embodiment; FIG. 2 is an exploded perspective view of the mattress cover according to the first embodiment. 1 is an exploded perspective view of a mattress cushion according to a first embodiment. FIG. FIG. 2 is a cross-sectional view of the mattress according to the first embodiment. 3 is a conceptual diagram showing a deformed state of the mattress according to the first embodiment. FIG. 13 is a conceptual diagram showing how the cushion body is housed in the bottom cover. FIG. 10A to 10C are conceptual diagrams showing an example of a method for draining and drying the cushion bodies when cleaning the cushion bodies. A cross-sectional view of a mattress according to a second embodiment. FIG. 5 is an exploded perspective view of a mattress cushion according to a second embodiment. A conceptual diagram showing a deformed state of a mattress according to a second embodiment. A cross-sectional view of a mattress according to a third embodiment. FIG. 11 is an exploded perspective view of a mattress cushion according to a third embodiment. A conceptual diagram showing a deformed state of a mattress according to a third embodiment. 11 is an explanatory diagram showing the state in which a gap widens at the boundary between cushion bodies. FIG. FIG. 11 is a perspective view of a mattress according to a fourth embodiment.

Embodiments of the present invention will be described below with reference to the drawings, taking as examples the first to third embodiments.

1. First embodiment Fig. 1 is a schematic perspective view of a mattress 1 according to a first embodiment of the present invention. The up-down, left-right, and front-rear directions of the mattress 1 are as shown in Fig. 1 etc. In Fig. 1, the general positions of the cushion members 21 to 23 are indicated by dashed lines to facilitate understanding of the internal configuration of the mattress 1.

Mattress 1 includes a mattress cover 10 that covers the entire outer surface of the mattress, and a mattress cushion 20 that is contained within the mattress cover 10. Overall, mattress 1 has a rectangular parallelepiped shape with sides in the front-to-back direction (length direction), left-to-right direction, and up-to-down direction (thickness direction), with the left-to-right dimension being slightly smaller than the front-to-back dimension, and the up-to-down dimension being sufficiently smaller than the left-to-right dimension.

The mattress cushion 20 is formed so that it can be separated into three cushion bodies 21-23. The mattress 1 is usually placed on a level floor or bed, etc., and used in a form in which the user lies on the upper side. When used in this manner, the up-down direction of the mattress 1 coincides with the vertical direction. As described above, the size of the mattress 1 in the front-to-back direction (length direction) is set to be rather long, and it can be suitably used in a form in which the front-to-back direction is approximately the same as the user's height.

The mattress cover 10 has a top cover 10a and a bottom cover 10b, and with the mattress cushion 20 placed inside, the covers 10a and 10b can be joined together with a fastener (which functions as an anti-stretching member 14, described later). Figure 2A is a schematic perspective view of the mattress cover 10 in a state in which the top cover 10a and the bottom cover 10b are joined together (joined state), and Figure 2B is a schematic exploded perspective view of the mattress cover 10 when disassembled into the top cover 10a and the bottom cover 10b.

The mattress cover 10 in the state shown in Figure 2A has a rectangular top surface portion 11 that comes into contact with the user when sleeping, a rectangular bottom surface portion 12 facing it, and a peripheral surface portion 13 made up of four rectangular side surfaces connected to each side (11a-11d, 12a-12d) of the top surface portion 11 and the bottom surface portion 12, and overall has a roughly rectangular parallelepiped shape with space inside.

More specifically, the upper surface portion 11 is surrounded by a left edge 11a and a right edge 11c that extend forward and backward, and a rear edge 11b and a front edge 11d that extend left and right. On the other hand, the lower surface portion 12 is surrounded by a left edge 12a and a right edge 12c that extend forward and backward, and a rear edge 12b and a front edge 12d that extend left and right.

The peripheral portion 13 has a left-facing side face sandwiched between sides 11a and 12a, a rearward-facing side face sandwiched between sides 11b and 12b, a rightward-facing side face sandwiched between sides 11c and 12c, and a forward-facing side face sandwiched between sides 11d and 12d. In this way, the peripheral portion 13 corresponds to the outer periphery of the mattress cover 10 when viewed from above. The forward-facing side face and the left-facing side face are connected at side 13a, the left-facing side face and the rearward-facing side face are connected at side 13b, the rearward-facing side face and the right-facing side face are connected at side 13c, and the right-facing side face and the forward-facing side face are connected at side 13d. The peripheral portion 13 can also be seen as a rectangular cylindrical side face consisting of four faces separated by the sides 13a to 13d.

The peripheral portion 13 is provided with an anti-stretch member 14. The anti-stretch member 14 is configured to be less stretchable than other portions of the mattress cover 10, and serves to prevent the mattress cover 10 from stretching in the length direction (body length direction). The anti-stretch member 14 is provided so that it goes around the peripheral portion 13 when viewed from above, with its vertical position (height) being approximately constant.

In this embodiment, a fastener using a woven tape is used as the stretch prevention member 14, and this fastener is arranged so as to cover the entire joint between the top cover 10a and the bottom cover 10b. By opening this fastener, the top cover 10a and the bottom cover 10b can be completely separated at the peripheral portion 13.

The stretch prevention member 14 prevents the mattress cover 10 from stretching in the length direction, and prevents the gaps between the cushion bodies 21 to 23 from widening due to the stretching of the mattress cover 10. Note that the stretch prevention member 14 is not limited to a member that completely prevents the stretching. The stretch prevention member 14 must be a member that stretches 2 cm or less per meter when pulled with a force of 100 N, and preferably a member that stretches 1 cm or less per meter. In particular, in the sides (left-facing and right-facing sides) parallel to the length direction (usually coinciding with the height direction of the user), it is preferable that the stretching be 0.5 cm or less per meter when pulled with a force of 100 N. Examples of materials that can be used as the stretch prevention member 14 include woven tapes made of synthetic fibers.

The anti-stretch members 14 are preferably attached at a position that is within a range of 50-99% of the height from the bottom surface 12 to the top surface 11 (a position closer to the top surface 11 than the center), and are preferably provided continuously in the circumferential direction when viewed from above. In this case, the anti-stretch members 14 are preferably disposed so as to continuously surround the circumferential surface 13, including the two side surfaces (the left-facing and right-facing sides) that are parallel to the longitudinal direction.

This embodiment employs a belt-shaped stretch prevention member 14, but other than this, it may be designed so that the entire peripheral portion 13 functions as a stretch prevention member, for example, by using canvas fabric. In addition, to improve breathability, it is desirable to provide the peripheral portion 13 with multiple ventilation holes or mesh fabric with excellent breathability.

The peripheral portion 13 corresponds to the peripheral portion of the mattress 1 (the outer peripheral surface of the mattress 1 when viewed from above). The shapes of the top portion 11 and the bottom portion 12 are not limited to a rectangle as in this embodiment, and may be, for example, a rectangle with rounded corners. In this case, the boundaries between the front, back, left and right sides of the peripheral portion 13 (the sides extending up and down) may also be rounded in a similar manner.

Figure 3 is an exploded perspective view of the mattress cushion 20 housed within the mattress 1 shown in Figure 1. The mattress cushion 20 can be divided into three cushion bodies 21-23 in the length direction. From another perspective, the mattress cushion 20 is formed by the three cushion bodies 21-23 arranged in sequence in the length direction.

All three cushion bodies 21-23 have the same configuration, and each includes a mesh-like inner cover 31 that covers the entire outer surface, and a filament three-dimensional combination body 41 housed therein. Each cushion body 21-23 is a substantially rectangular parallelepiped, and has an upward outer surface, a downward outer surface, and a peripheral surface (a portion consisting of a front-facing outer surface, a rear-facing outer surface, a left-facing outer surface, and a right-facing outer surface). In this embodiment, a fastener 31a is provided on the peripheral surface of the inner cover 31 as an opening and closing member for making the filament three-dimensional combination body 41 detachable. Also, one surface of the peripheral surface (the left-facing outer surface in this embodiment) is provided with hanging tools 31c, 31e and hanging tool storage pockets 31b, 31d for storing them.

In this embodiment, the hanging devices 31c and 31e have a hanging cord with one end fixed to the inner cover 31 and a hook fixed to the other end of the hanging cord. The hook can be hung on a clothesline pole or the like, and each of the cushion bodies 21 to 23 can be hung simply by hanging the hook on the clothesline pole or the like (see FIG. 6).

The three-dimensional filament bond 41 is an elastic member obtained by three-dimensionally fusing and bonding molten filaments of thermoplastic resin together. In the manufacturing process of the three-dimensional filament bond 41, molten thermoplastic resin is extruded vertically downward from multiple nozzles arranged horizontally. As a result, molten filaments with a cross-sectional diameter of about 1 mm are dropped into cooling water, and loops are formed by the buoyancy of the water, and at the same time, the multiple molten filaments that have formed the loops are three-dimensionally fusing and bonded together to obtain the three-dimensional filament bond 41. At this time, by regulating the width of the molten filament group with a chute and a take-up machine, etc., a smooth surface layer in which the density of the filaments is higher at both ends in the thickness direction than at the center in the thickness direction can be formed. As a manufacturing method of such a three-dimensional filament bond, the method disclosed in Patent Document 1, etc. can be adopted.

The thickness (vertical dimension) of the three-dimensional filament bond 41 is preferably within a range of 10 to 25 cm. In the three-dimensional filament bond 41, the filament diameter (diameter of the cross section) is preferably within a range of 0.5 to 2 mm, and the bulk density is preferably within a range of 30 to 150 kg/ ^m3 . In the mattress 1 according to this embodiment, all of these conditions are met. By forming a smooth surface layer in which the filament density is higher at both ends in the thickness direction than at the center in the thickness direction, and by keeping the thickness, filament diameter, and bulk density within the above ranges, it is possible to prevent as much as possible the formation of elliptical grooves on the surface of the mattress 1 due to deformation of each cushion body 21 to 23 in the length direction, without impairing the drainage and drying properties of the three-dimensional filament bond 41.

If the thickness of the filament three-dimensional bond 41 is less than 10 cm, the filament three-dimensional bond 41 itself will tend to twist and overlap vertically, making it difficult to adequately transmit the crimping force in the length direction. Conversely, if the thickness exceeds 25 cm, the filament three-dimensional bond 41 will become heavy and difficult to transport.

When the filament diameter in the three-dimensional filament bonded body 41 is less than 0.5 mm, the surface area of the filament increases the drainage after washing and the drying time increases. Conversely, when the filament diameter exceeds 2 mm, the three-dimensional filament bonded body 41 is likely to lose its soft feel. When the bulk density of the three-dimensional filament bonded body 41 is less than 30 kg/ ^m3 , the three-dimensional filament bonded body 41 itself is likely to deform in the length direction, and elliptical grooves and depressions are likely to occur on the mattress surface. Conversely, when the bulk density exceeds 150 kg/ ^m3 , the three-dimensional filament bonded body 41 becomes heavy and difficult to transport.

The bulk density of the filament three-dimensional bond can be measured, for example, by a measurement method using a rectangular parallelepiped measurement sample. In this measurement method, the mass W (kg) of the measurement sample and the size (m) of the measurement sample in each direction (vertical, horizontal, and height directions) are first measured. The volume V (m ³ ) of the measurement sample is calculated by multiplying the size (m) of the measurement sample in each direction (vertical, horizontal, and height directions). The bulk density (kg/m ³ ) is calculated by dividing the mass W (kg) of the measurement sample by the volume V (m ³ ) of the measurement sample.

Figure 4A is a cross-sectional view of the mattress 1 shown in Figure 1 (a cross-sectional view cut along a plane whose normal direction is the left-right direction). Figure 4B is a conceptual diagram showing the deformation state of the mattress 1 when a local load (pressure from the user's elbow, knee, etc.) is applied downward near the boundary between adjacent cushion bodies 21, 22. Note that the mattress 1 in Figure 4B is shown from the same perspective as Figure 4A.

The mattress 1 of this embodiment includes a number of cushion bodies 21-23 (which, when viewed collectively, form the mattress cushion 20) that include three-dimensional filament bonds that are difficult to deform in the longitudinal direction, and a mattress cover 10 that covers these cushion bodies 21-23 in a compressed state in the longitudinal direction. The mattress cover 10 is provided with an anti-stretch member 14, making it very difficult for the mattress cover 10 to stretch in the longitudinal direction. Therefore, even if a local load is applied to the gaps between the cushion bodies 21-23, grooves are unlikely to form, and it is possible to prevent the user's limbs (e.g. elbows and knees) from collapsing.

Figure 5 is a conceptual diagram showing an example of how the cushion bodies 21-23 are pressed against the bottom cover 10b and stored in the mattress 1. The mattress 1 in Figure 5 is shown from the same perspective as Figure 4A. The bottom cover 10b has a rectangular bottom portion 12 and a cylindrical side portion 13 connected to the outer edge of the bottom portion 12, and is formed in a box shape (a cylindrical shape with a bottom, with the bottom portion 12 as the bottom) into which the mattress cushion 20 can be fitted.

Figure 5 shows an example of a method for incorporating multiple cushion bodies 21-23 into the mattress cover 10, which uses the side portions 13 (the front and rear sides of the side portions 13) on both sides in the longitudinal direction of the bottom cover 10b. In this method, the sides of the two cushion bodies 21, 23 are first pressed against the front and rear sides of the side portion 13, respectively, and then the cushion body 22 is pressed vertically downward. With this method, the multiple cushion bodies 21-23 can be easily incorporated into the mattress cover 10 in a compressed state. Note that when the cushion body 22 is pressed in, it may be folded in a mountain fold.

Figure 6 is a conceptual diagram showing an example of a method for draining and drying the cushion bodies 21 to 23 when cleaning them. In this embodiment, the hanging devices 31c and 31e are composed of a hanging cord fixed to the inner cover 31 and a hook for hanging on a clothesline or the like. Therefore, each of the cushion bodies 21 to 23 can be hung simply by hanging the hook on the clothesline 50. Hanging in this manner makes it possible to drain and dry each of the cushion bodies 21 to 23 efficiently. Note that the hanging devices 31c and 31e may be composed of only two hanging cords so that the hanging cords can be directly tied to the clothesline to fix them, or a pair of buckles that can be joined or separated may be provided at the ends of the two hanging cords.

The material for the inner cover 31 is preferably a mesh fabric woven from polyester fibers with low water absorption (high water repellency). The material for the hanging devices 31c and 31e is preferably a mesh cord or tape woven from polyester fibers with low water absorption (high water repellency).

The mattress 1 according to this embodiment includes a mattress cushion 20 that can be divided into a plurality of cushion bodies 21-23 in the length direction, and a mattress cover 10 that can accommodate the mattress cushion 20, and a user can lie on the mattress cushion 20. Each of the plurality of cushion bodies 21-23 is formed using a resin filament three-dimensional bonded body having a smooth surface layer (a layer in which the filament density is higher than that of the center in the thickness direction) at both ends in the thickness direction. The filament three-dimensional bonded body has a thickness of 10-25 cm, a filament diameter of 0.5-2 mm, and a bulk density of 30-150 kg/m ³ , and the peripheral surface of the mattress cover 10 is provided with an extension prevention member 14 that prevents the mattress cover 10 from extending in the length direction. Therefore, according to the mattress 1, the mattress cushion 20, which has high water drainage and drying properties, can be divided and easily transported, washed with water, and dried. Furthermore, anti-stretch members 14 are provided on the peripheral surface (side surface) of the mattress cover 10, so that the gaps between the cushion bodies are less likely to widen (grooves are less likely to form) when sleeping, etc. As a result, in the mattress 1, knees, elbows, etc. are less likely to fall into the grooves without compromising the soft sleeping comfort, and cleaning work can be easily performed.

2. Second embodiment Next, a second embodiment of the present invention will be described. The second embodiment is basically the same as the first embodiment, except for the shape of the cushion body and points related thereto. In the following description, emphasis will be placed on the description of the parts different from the first embodiment, and the description of the parts common to the first embodiment may be omitted.

Figure 7A is a cross-sectional view of the mattress 100 according to the second embodiment (cross-sectional view cut along a plane normal to the left-right direction). Figure 7B is an exploded perspective view of a mattress cushion 120 used in the mattress 100. The mattress 100 includes a mattress cover 110 that covers the entire outer surface of the mattress, and a mattress cushion 120 housed therein. The mattress cushion 120 can be divided into a number of cushion bodies 121-123 in the length direction. In other words, the mattress cushion 120 is the number of cushion bodies 121-123 arranged in the length direction.

In this embodiment, the contact surface between each of the multiple cushion bodies 121-123 and the adjacent cushion body has an inclination angle in the range of 20-70° with respect to the vertical direction. More specifically, as shown in FIG. 7A, the cushion body 121 and the cushion body 122 contact each other at the contact surface Y1, which is a plane. The inclination angle θ1 with respect to the vertical direction of the contact surface Y1 (corresponding to the vertical direction when the mattress 100 is placed on a horizontal surface) is within the range of 20-70°. The cushion body 122 and the cushion body 123 contact each other at the contact surface Y2, which is a plane. The inclination angle θ2 with respect to the vertical direction of the contact surface Y2 is also within the range of 20-70°.

Figure 8 is a conceptual diagram showing the deformation state of mattress 100 when a local load (pressure from the user's hands and feet, as in the case of Figure 11) is applied downward near contact surface Y1. Note that mattress 100 in Figure 8 is shown from the same perspective as Figure 7A. In mattress 100, the gaps formed between adjacent cushion bodies have a predetermined angle from the vertical direction, so that the gaps do not easily widen even when a vertical load is applied to the gaps. This prevents the formation of grooves due to the widening of the gaps, making it difficult for hands and feet to fall between adjacent cushion bodies.

If the inclination angle is too small, the contact surface becomes closer to a vertical plane, and the effect of suppressing the formation of the groove is weakened. On the other hand, if the inclination angle is too large, the size of the cushion body in the front-to-rear direction becomes larger, which hinders miniaturization of the cushion body. Taking these points into consideration, in this embodiment, the inclination angle is set within an appropriate range of 20 to 70 degrees.

In the second embodiment, as described above, the shape of the cushion body is designed to suppress the formation of the above-mentioned grooves. Therefore, even if the second embodiment does not include an anti-stretch member (see the explanation of the first embodiment), it is possible to suppress the formation of the above-mentioned grooves compared to a mattress such as that shown in FIG. 11 (where the contact surface between the cushion bodies is a nearly vertical surface).

3. Third embodiment Next, a third embodiment of the present invention will be described. The third embodiment is basically the same as the first embodiment, except for the shape of the cushion body and points related thereto. In the following description, emphasis will be placed on the description of the parts that are different from the first embodiment, and the description of the parts that are common to the first embodiment may be omitted.

Figure 9A is a cross-sectional view of mattress 200 according to the third embodiment (cross-sectional view cut along a plane normal to the left-right direction). Figure 9B is an exploded perspective view of mattress cushion 220 used in mattress 200. Mattress 200 includes mattress cover 210 that covers the entire outer surface thereof, and mattress cushion 220 contained therein. Mattress cushion 220 can be divided into multiple cushion bodies 221-223 in the length direction. In other words, multiple cushion bodies 221-223 arranged in the length direction correspond to mattress cushion 220.

Each of the cushion bodies 221-223 has a structure in which three thin rectangular parallelepiped 3D filament combination bodies (for convenience, referred to as the lower layer, middle layer, and upper layer, respectively) are stacked from bottom to top. Each of the cushion bodies 221-223 may be formed by bonding each layer formed separately using an adhesive. In each of the cushion bodies 221-223, the contact portion with the adjacent cushion body is composed of multiple rectangular parallelepiped surfaces, and uneven surfaces that fit together are formed. In this way, the convex portion on one of the adjacent cushion bodies fits into the concave portion on the other.

For example, as shown in Figures 9A and 9B, at the contact portion between adjacent cushion bodies 221 and 222, a convex portion 221a is provided on cushion body 221. This convex portion 221a is formed by having the rear end of the middle layer protrude further rearward than the rear ends of the upper and lower layers. On the other hand, a concave portion 222a is provided on cushion body 222. This concave portion 222a is formed by having the front ends of the upper and lower layers protrude further forward than the front end of the middle layer. The amount of protrusion of convex portion 221a is equal to the amount of recession of concave portion 222a, and adjacent cushion bodies 221, 222 contact with each other with convex portion 221a fitted into concave portion 222a.

Because of the unevenness described above, the front-to-rear boundaries Z1 to Z3 of these cushion bodies 221 and 222 are not continuous in the up-down direction. Similarly, the front-to-rear boundaries of the contact areas between adjacent cushion bodies 222 and 223 are also not continuous in the up-down direction.

Figure 10 is a conceptual diagram showing the deformation state of mattress 200 when a local load (pressure from the user's hands and feet, as in the case of Figure 11) is applied downward near boundary Z1. Note that mattress 200 in Figure 10 is shown from the same perspective as Figure 9A. In mattress 200, the gaps formed between adjacent cushion bodies are not continuous, so that the hands and feet are less likely to sink to the bottom even when a downward load is applied.

In the third embodiment, as described above, the shape of the cushion body is designed to suppress the formation of the above-mentioned grooves. Therefore, in the third embodiment, even if an anti-stretch member (see the explanation of the first embodiment) is not provided, it is possible to suppress the formation of the above-mentioned grooves compared to a mattress such as that shown in FIG. 11 (where the contact surface between the cushion bodies is a nearly vertical plane).

4. Fourth embodiment Next, a fourth embodiment of the present invention will be described. The fourth embodiment is a mattress that takes into consideration the usage of a mattress for a double bed, and is basically the same as the first embodiment except for the number of cushion bodies. In the following description, emphasis will be placed on the description of the parts that differ from the first embodiment, and the description of the parts that are common to the first embodiment may be omitted.

Figure 12 is a perspective view of a mattress 300 according to a fourth embodiment. The mattress 300 includes a mattress cover 310 that covers the entire outer surface of the mattress, and a mattress cushion 320 that is housed therein.

The mattress cushion 320 is formed by three cushion bodies 321a to 323a arranged in a line in the length direction (front-back direction) and three cushion bodies 321b to 323b arranged in a line in the length direction. These six cushion bodies 321a to 323a and 321b to 323b are all formed to have approximately the same shape and dimensions. The row of three cushion bodies 321a to 323a and the row of three cushion bodies 321b to 323b are arranged side by side. This makes it easy to select cushion bodies with a hardness (resilience) suitable for each person when multiple users sleep on the mattress 300. For example, when two users sleep side by side on the mattress 300, the cushion bodies 321a to 323a can be selected to have a hardness suitable for one user, and the cushion bodies 321b to 323b can be selected to have a hardness suitable for the other user.

The mattress cover 310 has a top cover 310a and a bottom cover 310b, and is provided with a stretch prevention member 314 that connects the covers 310a and 310b. The top cover 310a, the bottom cover 310b, and the stretch prevention member 314 correspond to the top cover 10a, the bottom cover 10b, and the stretch prevention member 14 in the first embodiment.

The inner side of the mattress cover 310 is provided with a front-rear internal stretch prevention member 314a that regulates the stretch of the mattress cover 310 in the front-rear direction, and two left-right internal stretch prevention members 314b, 314c that regulate the stretch of the mattress cover 310 in the left-right direction. In this embodiment, both ends of these stretch prevention members 314a to 314c are fixed to the side of the bottom cover 310b (immediately below the stretch prevention member 314). The front-rear internal stretch prevention member 314a is stretched along the boundary between the three cushion bodies 321a to 323a on the left side and the three cushion bodies 321b to 323b on the right side. The left-right internal stretch prevention member 314b is stretched along the boundary between the two cushion bodies 321a, 321b on the front side and the two cushion bodies 322a, 322b arranged in the center in the front-rear direction. The left-right internal stretch prevention member 314c is stretched along the boundary between the two rear cushion bodies 323a, 323b and the two cushion bodies 322a, 322b located in the center in the front-rear direction. These stretch prevention members 314a-314c are configured to be less stretchable than the top cover 310a and bottom cover 310b, and serve to more effectively prevent the mattress cover 310 from stretching.

Although the embodiment of the present invention has been described above, the configuration of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. In other words, the above embodiment should be considered to be illustrative in all respects and not restrictive. The technical scope of the present invention is indicated by the claims, not the description of the above embodiment, and should be understood to include all modifications that are equivalent in meaning and scope to the claims.

The present invention can be used for mattresses formed using cushion bodies.

1 Mattress (first embodiment)
REFERENCE SIGNS LIST 10 Mattress cover 10a Top cover 10b Bottom cover 11 Top portion 12 Bottom portion 13 Peripheral portion 14 Anti-stretch member 20 Mattress cushion (first embodiment)
21 to 23 Cushion body (first embodiment)
31 Inner cover 41 Filament three-dimensional assembly 100 Mattress (second embodiment)
110 Mattress cover (second embodiment)
120 Mattress cushion (second embodiment)
121 to 123 Cushion body (second embodiment)
200 Mattress (third embodiment)
210 Mattress cover (third embodiment)
220 Mattress cushion (third embodiment)
221 to 223 Cushion body (third embodiment)
221a Convex portion 222a Concave portion 300 Mattress (fourth embodiment)
310 Mattress cover (fourth embodiment)
320 Mattress cushion (fourth embodiment)
321a to 323a, 321b to 323b: cushion body (fourth embodiment)

Claims (2)

A mattress cushion that can be separated into a plurality of cushion bodies in the length direction is housed in a mattress cover, and a user can lie on the upper side in the thickness direction of the mattress,
The plurality of cushion bodies are rectangular parallelepiped three-dimensional resin filament combinations having a bulk density of 30 to 150 kg/m3 and a filament diameter of 0.5 to 2 mm,
The contact surfaces with the adjacent cushion bodies are the end side surfaces in the length direction, and the both ends in the thickness direction have a smooth surface layer in which the density of filaments is higher than that in the central part in the thickness direction,
The mattress cover has a peripheral surface portion that extends around the entire circumference when viewed from above, and the peripheral surface portion extends within 2 cm per meter when pulled with a force of 100 N.
The mattress cover covers the plurality of cushion bodies made of the filament three-dimensional bonded bodies in a longitudinal direction in a compressed state.
A mattress characterized by: 2. The mattress according to claim 1, wherein the mattress cover comprises a top cover and a bottom cover that can be opened and closed by an opening and closing member.

Images