JP7809016B2 - mattress - Google Patents

Description

This disclosure relates to a mattress.

Mattresses using soft foam have been known for some time (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2020-14737

The mattress in Patent Document 1 has grooves in the longitudinal and lateral directions of the mattress. The mattress in Patent Document 1 is divided into multiple zones, with the longitudinal grooves spaced differently in each zone. This makes the mattress easier to bend. However, Patent Document 1 does not disclose a mattress that takes into account turning over in sleep. The objective of this disclosure is to provide a new mattress that makes it easier to turn over in sleep.

A mattress according to one aspect of the present disclosure comprises a support surface that contacts the user's body, a plurality of first grooves that extend along the shorter side of the support surface and have a first depth from the support surface, a plurality of second grooves that extend along the longer side of the support surface and have a second depth from the support surface that is greater than the first depth, and a plurality of protruding portions separated by two adjacent first grooves and two adjacent second grooves. The protruding portions have a top surface, and at least a portion of the top surface includes the support surface.

With this mattress, the user's body comes into contact with the support surface included in the top surface of the convex portion, and the user turns over in the short direction. Furthermore, with this mattress, the second groove portion extending in the long direction is deeper than the first groove portion extending in the short direction. Therefore, the convex portion separated by the first groove portion and the second groove portion moves more easily in the short direction than in the long direction. As a result, when the user turns over, the convex portion moves in the short direction, making it easier to turn over.

This disclosure provides a new mattress that makes it easy to turn over in bed.

1 is a plan view of a mattress according to an embodiment of the present disclosure. FIG. 2 is a cross-sectional view showing the II cross section of FIG. FIG. 3 is an enlarged view of part A in FIG. 2 . FIG. 2 is a cross-sectional view showing the II-II cross section of FIG. FIG. 5 is an enlarged view of part B in FIG. 4 . FIG. 10 is an enlarged cross-sectional view of a mattress in another embodiment. 1 is a graph showing the relationship between deflection and load of a mattress according to an embodiment of the present disclosure. FIG. 10 is an enlarged longitudinal cross-sectional view of another embodiment of a mattress of the present disclosure.

Embodiments of the present disclosure will be described below with reference to the drawings.

As shown in FIG. 1, the mattress 1 of the present disclosure is a generally rectangular mattress 1 in plan view, extending in the longitudinal direction L and the lateral direction S. The mattress 1 is made of an elastically deformable soft foam. In this embodiment, the mattress 1 is made of polyurethane foam. A user of such a mattress 1 lies in the longitudinal direction L and turns in the lateral direction S.

As shown in Figures 1 to 5, the mattress 1 has a support surface 2, a first groove portion 4, a second groove portion 6, a convex portion 8, a back surface 10, a concave portion 12, and a back surface convex portion 14.

The support surface 2 is the surface that comes into contact with the user. Therefore, the support surface 2 forms the upper end of the mattress 1 in the thickness direction T, and also serves as the surface of the mattress 1. The mattress 1 in this embodiment has a thickness of 100 mm. However, the thickness of the mattress 1 can be changed as appropriate.

The back surface 10 is the surface that is placed on a bed frame or the like. In this embodiment, multiple approximately trapezoidal recesses 12 are provided on the back surface 10. The recesses 12 extend from one end 1a to the other end 1b in the short direction S of the mattress 1, forming an uneven surface on the back surface 10. As shown in FIG. 3, in this embodiment, the center of each recess 12 is located so that it overlaps with the bottom 4a of the first groove 4 in the thickness direction T. In other words, the recess 12 is located on the opposite side of the mattress 1 from the first groove 4. By providing an uneven surface on the back surface 10 in this manner, when the mattress 1 is placed on a bed frame or the like, the recesses 12 form a space between the mattress 1 and the bed frame, improving ventilation from the support surface 2 to the back surface 10. Furthermore, the back surface protrusions 14 formed alongside the recesses 12 on the back surface 10 deform when a load is applied to the support surface 2, generating stress in the mattress 1 at a different time than the protrusions 8 on the front surface. As a result, when a load is applied to the support surface 2, the mattress 1 generates stress in multiple stages due to the convex portions 8 on the front surface and the convex portions 14 on the back surface.

The polyurethane foam used to form the mattress 1 has a density of 15 to 100 kg/ ^m3 . The density of the polyurethane foam is more preferably 25 to 60 kg/ ^m3 . If the density of the polyurethane foam is less than 15 kg/ ^m3 , it will be difficult to obtain sufficient hardness as a shaped mattress, and durability will also tend to be poor. On the other hand, if the density of the polyurethane foam exceeds 100 kg/ ^m3 , the weight of the entire mattress 1 will increase, making it difficult to handle.

The polyurethane foam forming mattress 1 is made of a material with a hardness of 50 to 400N. A hardness of 120 to 300N is preferred. A hardness of 150N to 250N is even more preferred. In particular, the polyurethane foam forming mattress 1 of this embodiment is preferably made of a base material with a hardness of over 150N, from the standpoint of ensuring the workability of the mattress 1 and the feeling of sinking in (stroking) when the user lies down on it.

The resilience of the polyurethane foam that forms the mattress 1 can be selected appropriately, but a material with a resilience of 25% or more is used, and more preferably a material with a resilience of 40% or more. This improves the recovery of the protrusions 8 (ease of returning to their original shape) and improves the ease of turning over in bed.

As shown in Figures 1 and 2, the first groove portion 4 is a groove that extends along the short side direction S of the mattress 1 from one end 1a to the other end 1b in the short side direction S. The multiple first groove portions 4 function as absorption grooves that absorb deformation of the mattress 1 by deforming in a direction that narrows the groove width when the mattress 1 is bent, making the mattress 1 easier to bend. Such a mattress 1 may also be used in a bed that can be gagged up. For this reason, it is preferable for the mattress 1 to follow the bed frame when the bed is gagged up. This ability of the mattress 1 to follow the bed frame is called gagging performance. The first groove portions 4 are provided to improve the gagging performance of the mattress 1.

Multiple first grooves 4 are provided in the longitudinal direction L. In this embodiment, the first first groove 4 is provided at a first distance D1 from one end 1c of the mattress 1 in the longitudinal direction L. A first distance D1 is also provided at the other end 1d of the mattress 1 in the longitudinal direction L. In this embodiment, the first distance D1 is approximately 150 mm. However, the first distance D1 can be changed as needed. Furthermore, in this embodiment, 22 first grooves 4 are provided. However, the number of first grooves 4 can be changed as needed depending on the gage performance.

As shown in Figures 2 and 3, the multiple first groove portions 4 are arranged at a second distance D2 from the first first groove portion 4. In this embodiment, the second distance D2 is approximately 77 mm. However, the second distance D2 can be changed as appropriate depending on the size of the mattress 1, the hardness and gage performance required of the mattress 1, etc.

As shown in Figure 3, the depth of the multiple first groove portions 4 from the support surface 2 is a first depth X1. The first depth X1 is the distance from the bottom 4a of the first groove portion 4 to the support surface 2. The bottom 4a of the first groove portion 4 has a curved surface. In this embodiment, the first depth X1 is 30 mm. However, the first depth X1 only needs to be shallower than the second depth X2 of the second groove portion 6 described below, and can be changed as appropriate depending on the thickness T of the mattress 1, the hardness required of the mattress 1, or the gage performance required of the mattress 1.

Furthermore, the first groove width W1, which is the groove width of the first groove portion 4 in this embodiment, is 1.0 mm or more, and more preferably 5.0 mm or more. In this embodiment, the first groove width W1 is 7.0 mm. However, the first groove width W1 can be changed as appropriate depending on the hardness required of the mattress 1 or the gagging performance required of the mattress 1. The larger the first groove width W1, the better the gagging performance.

As shown in Figures 1 and 4, the second groove portions 6 are grooves that extend along the longitudinal direction L of the mattress 1 from one end 1c to the other end 1d. The multiple second groove portions 6 function as deformation grooves that make it easier for the convex portions 8 to deform when the user turns over in their sleep.

Multiple second grooves 6 are provided in the short direction S. In this embodiment, the first second groove 6 is provided at a third distance D3 from one end 1c of the mattress 1 in the longitudinal direction L. A third distance D3 is also provided at the other end 1d of the mattress 1 in the longitudinal direction L. In this embodiment, the third distance D3 is approximately 125 mm. However, the third distance D3 can be changed as needed. Furthermore, in this embodiment, 13 second grooves 6 are provided. However, the number of second grooves 6 can be changed as needed depending on the length of the mattress 1 in the short direction.

As shown in Figure 5, the multiple second groove portions 6 are arranged at a fourth distance D4 from the first second groove portion 6. In this embodiment, the fourth distance D4 is approximately 60 mm. However, the fourth distance D4 can be changed as appropriate depending on the length of the mattress 1 in the short direction, the hardness required for the mattress 1, etc.

The depth of the multiple second grooves 6 from the support surface 2 is the second depth X2. The second depth X2 is the distance from the bottom 6a of the second groove 6 to the support surface 2. In this embodiment, the second depth X2 is 50 mm. However, as long as the second depth X2 is greater than the first depth X1 of the first groove 4 described above, it can be changed as appropriate depending on the thickness T of the mattress 1, the hardness required of the mattress 1, etc.

Furthermore, the second groove width W2, which is the groove width of the second groove portion 6 in this embodiment, is 1.0 mm or more, and more preferably 10.0 mm or more. In this embodiment, the second groove width W2 is 10.0 mm. However, the second groove width W2 can be changed as appropriate depending on the length of the mattress 1 in the short direction, the hardness required of the mattress 1, etc.

The first groove width W1 and the second groove width W2 are preferably 1.0 to 30 mm, and more preferably 5 to 15 mm. If the first groove width W1 and the second groove width W2 are narrower than 1.0 mm, when the convex portions 8 bend, there is a large amount of cushioning between adjacent convex portions 8. This makes it difficult for the convex portions 8 to exhibit the bending characteristics required of independent convex portions 8. Furthermore, when recovering from bending, friction with adjacent convex portions 8 may make it difficult for the convex portions 8 to return to their original position.

It is more preferable that the second groove width W2 be wider than the first groove width W1. By widening the second groove width W2, the convex portion 8 can easily collapse in the short direction S. This makes it easier for the convex portion 8 to return to its original shape due to the reaction force of the soft foam when the load is released by the user turning over in bed. Furthermore, when a load is applied by turning over in bed, the shape collapses and bends easily in accordance with the flexure of the soft foam.

As shown in FIG. 1, the convex portion 8 is a portion separated by two adjacent first groove portions 4 and two adjacent second groove portions 6. Therefore, the mattress 1 has multiple convex portions 8 on its surface. The convex portions 8 have a top surface 8a, and at least a portion of the top surface 8a includes the support surface 2. The multiple convex portions 8 receive the load from the support surface 2 that supports the user. In this way, by providing multiple convex portions 8, the load received by the support surface 2 is distributed among the multiple convex portions 8. This distributes the load on the user, providing a comfortable sleep.

As shown in Figure 3, when the mattress 1 is viewed in cross section I-I in the longitudinal direction L, the cross section of the protrusion 8 along the longitudinal direction L is the first cross section 8b. In this embodiment, the first cross section 8b is generally rectangular and includes a notch 8c with rounded corners at the edge in the longitudinal direction L. Therefore, the length D5 of the protrusion 8 along the longitudinal direction L on the support surface 2 is smaller than the distance (same as the second distance D2) between two adjacent first grooves 4 at the bottom 4a (an example of the first position) where the first grooves 4 are at the first depth X1 from the support surface 2. In other words, the top surface 8a of the protrusion 8 includes a straight portion extending along the support surface 2 and a notch 8c formed in a curved shape. The length D5 along the longitudinal direction L is the length of this straight portion. The notch 8c is a cutout portion of the edge of the protrusion 8 that contacts the first groove 4. The width of the first groove 4 becomes wider than the first groove width W1 as it extends toward the support surface 2, and the shape of the first cross section 8b of the protrusion 8 tapers toward the support surface 2. The cross section of the notch 8c may be an upwardly convex curved surface as shown in FIG. 3, a downwardly convex curved surface, or a linear, tapered shape. By providing the notch 8c in this way, interference between adjacent protrusions 8 is prevented, improving gaging performance. However, it is sufficient for at least a portion of the top surface 8a to extend along the support surface 2 in the longitudinal direction L.

As shown in Figure 5, when the mattress 1 is viewed in a cross section II-II in the short direction S, the cross section of the convex portion 8 along the short direction S is the second cross section 8e. In this embodiment, the second cross section 8e has a rounded shape that combines an arc and straight lines that form the support surface 2. The radius of the arc portion of the second cross section 8e is larger than the radius of the cutout portion 8c. The second groove portion 6 makes it easy for the convex portion 8 to fall in the short direction. Therefore, by making the radius of the arc portion of the second cross section 8e larger, it is possible to prevent interference with adjacent convex portions 8 when the user turns over. As a result, the convex portions 8 move more easily, making it easier for the user to turn over.

In this embodiment, the length of the protrusions 8 in the longitudinal direction L (length D5 plus the length of the two cutouts 8c) is longer than the length of the protrusions 8 in the lateral direction S (the same length as the fourth distance D4-W2). In other words, the planar cross section of the protrusions 8 viewed from above (from the support surface 2 side) is roughly rectangular, with the protrusions 8's longitudinal direction extending in the same direction as the longitudinal direction L of the mattress 1 and the protrusions 8's lateral direction extending in the same direction as the lateral direction S of the mattress 1. By making the length of the protrusions 8 in the longitudinal direction L longer than the length of the lateral direction S of the protrusions 8, the protrusions 8 are more likely to move (tip) in the lateral direction S but less likely to move (tip) in the longitudinal direction L, contributing to the ability to turn over in sleep.

Furthermore, as mentioned above, the second depth X2 of the second groove portion 6 is deeper than the first depth X1 of the first groove portion 4. In other words, the longitudinal groove surrounding the convex portion 8 (in this embodiment, the second groove portion 6) is deeper than the lateral groove (in this embodiment, the first groove portion 4). This makes it easier for the convex portion 8 to tilt and collapse in the lateral direction S, contributing to the ability to turn over in bed.

In addition, due to the cutouts 8c and rounded shape of the protrusions 8, the contact area of the support surface 2 with the user's body is a roughly rectangular shape that is long in the longitudinal direction of the protrusions 8. Furthermore, the horizontal area of the protrusions 8 on the support surface 2 side of the mattress 1 is smaller than that of the base (bottom 6a side), and the horizontal cross-sectional area of the base (bottom 6a side) of the protrusions 8 is larger than that of the support surface 2. For this reason, the more load is applied to the support surface 2, the greater the stress caused by the deflection of the protrusions 8. As a result, as shown in Figure 7, the structure is such that the stress increases as the load is applied, and the stress (load) deflection curve progresses more linearly.

As shown in FIG. 6 , the convex portion 8 may include a tapered portion 11. The tapered portion 11 is a portion in the second cross section 8e where the length D6 along the short-side direction S is smaller than the second distance D2 between two adjacent second groove portions 6. The length D6 is a length in the short-side direction S of the convex portion 8 corresponding to a certain groove depth position that is shorter than the length in the short-side direction S of the convex portion 8 corresponding to a groove depth position in the support surface 2 direction (same as the thickness T direction in this embodiment). The length D6 is preferably the length at which the length in the short-side direction S of the convex portion 8 is minimum. In other words, the length D6 of the tapered portion 11 is preferably shorter than the length in the short-side direction of the second cross section 8e at a position where the groove depth is shallower than the tapered portion 11, and is the length of the convex portion 8 at a position where the groove width in the short-side direction S is maximum. The tapered portion 11 may be provided between the support surface 2 and the bottom 6a (an example of a second position) that is a distance from the support surface 2 to the second depth X2. This makes it easier for the protrusion 8 to move in the short direction.

Figure 7 is a graph showing the stress generated by the mattress on the vertical axis and the deflection of the mattress 1 on the horizontal axis. The curve showing the deflection of the mattress 1 of this embodiment is shown as a solid line, and the curve showing the deflection of a conventional mattress is shown as a dashed line. As shown in Figure 7, when a load is applied to the convex portions 8 of the mattress 1 configured in this manner, and the mattress 1 is deflected, the stress rises linearly with respect to the deflection. In this way, by creating a characteristic in which stress is generated linearly with respect to the deflection of the convex portions 8, it is possible to ensure a constant sinking of the mattress regardless of the user's weight.

Furthermore, when a user turns over in bed, the change in load is primarily due to a displacement of the user's weight in the short direction S, and the change in the longitudinal direction L is a change that accompanies the change in the short direction S. Furthermore, when changing the user's position during nursing care (to prevent bedsores in bedridden patients, for example), the body position is changed in the short direction S, and the change in the longitudinal direction L is a change that accompanies this change.

Furthermore, when turning over or changing position, the user's (human) body shape is not round and rollable. For this reason, the mattress 1 needs to flex and sink to a certain extent to fit the shape of the human body (ensuring stroke), and return to its original shape through the mattress's rebound. With the mattress 1 of the present disclosure, when the user's body position changes as they turn over, and the position on the support surface 2 that receives the load changes, the mattress 1 flexes more in the short direction S than in the long direction L. This makes it easier for the support surface 2 to sink when the user turns over. Furthermore, if the mattress 1 generates stress in this linear manner when the user's body moves and the load on the support surface 2 is released, the protrusions 8 recover quickly (have good recovery), providing a strong lifting effect that pushes up the user's body. This makes it easier to turn over.

As explained above, the present disclosure provides a novel mattress 1 that makes it easy to turn over in sleep. Furthermore, while embodiments of the present disclosure have been described, the present disclosure is not limited to the above embodiments, and various modifications are possible without departing from the spirit of the invention.

For example, in the above embodiment, a notch 8c is provided at the upper portion of the first groove 4, which has a constant groove width (first groove width W1 in the above embodiment) adjacent to both ends of the top surface 8a in the longitudinal direction L, in the support surface 2 direction. However, the present disclosure is not limited to this and may be as follows. For example, as shown in FIG. 8, when the mattress 1 is viewed in cross section I-I in the longitudinal direction L, the first cross section 8b of the convex portion 8 along the longitudinal direction L may be roughly trapezoidal. Therefore, the grooves at both ends of the top surface 8a in the longitudinal direction L do not need to have a constant groove width. In the case of a mattress 1 having such a convex portion 8 shape, the groove width of the first groove 4 may decrease toward the bottom 4a. In other words, the shape of the first groove 4 may be formed as an inverted triangle with the base on the support surface side. In this case, the top surface 8a may be the upper base portion of the trapezoidal first cross section 8b. Furthermore, the length D5 in the longitudinal direction L may be the straight line length of the upper base portion of the trapezoidal first cross section 8b. Additionally, the thickness T, length D5 along the longitudinal direction L, second spacing D2, and first depth X1 of the mattress 1 may be the same as those of the mattress 1 in Figure 3. The convex portion 8 may also include a narrowed portion 11. Furthermore, this mattress 1 may also include a back surface 10, a recessed portion 12, and a back surface convex portion 14, similar to the mattress 1 in Figure 1.

1: Mattress 2: Support surface 4: First groove portion 6: Second groove portion 8: Convex portion 11: Squeezed portion

Claims (5)

a support surface that contacts the user's body;
a plurality of first grooves extending along a short direction of the support surface and having a first depth from the support surface;
a plurality of second grooves extending along the longitudinal direction of the support surface and having a second depth from the support surface that is greater than the first depth;
a plurality of protrusions separated by two adjacent first grooves and two adjacent second grooves;
The back and
Equipped with
The protrusion has a top surface,
At least a portion of the top surface includes the support surface,
the rear surface includes a plurality of recesses and rear surface protrusions,
The center of the recess is provided at a position overlapping with the bottom of the first groove in the thickness direction.
mattress. a support surface that contacts the user's body;
a plurality of first grooves extending along a short direction of the support surface and having a first depth from the support surface;
a plurality of second grooves extending along the longitudinal direction of the support surface and having a second depth from the support surface that is greater than the first depth;
a plurality of protrusions separated by two adjacent first grooves and two adjacent second grooves;
Equipped with
The protrusion has a top surface,
At least a portion of the top surface includes the support surface,
The first grooves are formed at equal intervals across the entire longitudinal range of the mattress, with a first distance between each of the longitudinal ends of the mattress . a support surface that contacts the user's body;
a plurality of first grooves extending along a short direction of the support surface and having a first depth from the support surface;
a plurality of second grooves extending along the longitudinal direction of the support surface and having a second depth from the support surface that is greater than the first depth;
a plurality of protrusions separated by two adjacent first grooves and two adjacent second grooves;
A polyurethane foam mattress comprising:
The polyurethane foam forming the mattress has a hardness of 150-250N and a density of 25-60 kg/ ^m3 ;
a groove width of the first groove portion is 5.0 mm or more, a groove width of the second groove portion is 10.0 mm or more, and the groove width of the second groove portion is wider than the groove width of the first groove portion;
The protrusion has a top surface,
At least a portion of the top surface includes the support surface,
a first cross section that is a cross section along the longitudinal direction of the protrusion includes a notch at an edge portion in the longitudinal direction;
a length of the protrusion along the longitudinal direction on the support surface is smaller than a distance between two adjacent first groove portions at a first position where a distance from the support surface corresponds to the first depth,
a second cross section that is a cross section along the short-side direction of the protrusion includes a narrowed portion whose length along the short-side direction is shorter than a distance between two adjacent second groove portions, and a second position whose distance from the support surface is the second depth,
The throttle portion is provided between the support surface and the second position.
mattress. The length of the protrusion in the longitudinal direction is longer than the length of the protrusion in the lateral direction.
A mattress according to any one of claims 1 to 3 . At least a portion of the top surface extends along the support surface in the longitudinal direction.
A mattress according to any one of claims 1 to 3 .