JP2024049495A - Cushion body and hardness adjustment method of cushion body - Google Patents

Abstract

To provide a cushion body on which hardness on a desired part can be adjusted according to taste of a user, and in which reduction of industrial waste in a production process can be achieved relative to prior arts.SOLUTION: A cushion body comprises: a body member 1 having elasticity; and a first adjustment member 2 and a second adjustment member 3 which are formed of a same material as the body member 1. The body member 1 comprises on a surface, a linear first recess groove 11 and a linear second recess groove 12, the first adjustment member 2 and the second adjustment member 3 are rod-shaped, and a cross sectional shape perpendicular to a longitudinal direction of the first adjustment member 2 and the second adjustment member 3 is same as a cross sectional shape perpendicular to an extension direction of the first recess groove 11 and the second recess groove 12. In a reference mode of the body member 1, the first adjustment member 2 is fitted to the first recess groove 11 and the second adjustment member 3 is fitted to the second recess groove 12, therefore the first recess groove 11 and the second recess groove 12 are not apparent, and when the first adjustment member 2 and the second adjustment member 3 are detached from the first recess groove 11 and the second recess groove 12, the first recess groove 11 and the second recess groove 12 become apparent, and hardness of the body member 1 is partially adjusted.SELECTED DRAWING: Figure 2

Description

The present invention relates to a cushion body that can be used in mattresses and the like, and a method for adjusting the hardness of the cushion body.

General functions required for cushioning materials such as mattresses and cushions include cushioning, heat retention, and cleanliness, but the functions required for these cushioning materials vary depending on the user's situation and preferences.

As a result, various technologies have been proposed that divide the mattress into multiple zones corresponding to different parts of the body and vary the hardness of each zone to appropriately distribute the pressure on each part of the user's body.

One of the applicants of the present invention has also proposed a mattress formed by arranging multiple block bodies having a laminated structure in the longitudinal and/or lateral directions, in which the hardness of the block bodies can be adjusted by replacing the desired layer (Patent Document 1), and a mattress in which the hardness of a desired part of the base can be adjusted by attaching a hardness adjusting material 2 by engaging a through hole with a protrusion provided on the surface of the base of the mattress (Patent Document 2).

Utility Model Registration No. 3221097 JP 2021-115208 A

In recent years, society as a whole has been working on the Sustainable Development Goals (SDGs). As part of the SDGs, "responsible production," there is a growing social demand for the reduction of industrial waste.
SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a cushion body which allows the hardness of a desired portion to be adjusted in accordance with the user's preference and which also allows for a reduction in industrial waste in the manufacturing process compared to conventional methods.

The cushion body according to one aspect of the present invention that achieves the above-mentioned object is a plate-shaped cushion body that includes an elastic main body member and a plurality of hardness adjustment members, the main body member having a plurality of linear grooves on at least one of the front and back surfaces, the hardness adjustment members being rod-shaped, the cross-sectional shape perpendicular to the longitudinal direction of the hardness adjustment members being the same as the cross-sectional shape perpendicular to the extension direction of the grooves, and in the standard aspect of the main body member, the hardness adjustment members are fitted into the grooves so that the grooves are not visible, and the hardness of the main body member is partially adjusted by removing the hardness adjustment members from the grooves so that the grooves are visible.

In the cushion body of the above configuration, it is preferable that the removal direction of the hardness adjustment member from the groove is the thickness direction of the main body member, and that the cross-sectional shape perpendicular to the extension direction of the groove and the cross-sectional shape perpendicular to the longitudinal direction of the hardness adjustment member have an expanded portion whose width is greater than the width of the tip of the hardness adjustment member in the removal direction.
Here, it is preferable that the shape of the widened portion is such that the width at the rear end side in the removal direction of the hardness adjusting member is smallest and that the width increases continuously toward the front end side in the removal direction.

In the cushion body having the above configuration, it is preferable that the grooves have two or more types of grooves with different depths, and the hardness adjustment members have two or more types of hardness adjustment members corresponding to the two or more types of grooves with different depths.

In the cushion body having the above configuration, it is preferable that the groove has a first groove and a second groove that is deeper than the first groove, and the hardness adjustment member has a first adjustment member that corresponds to the first groove and a second adjustment member that corresponds to the second groove.

In the cushion body having the above configuration, it is preferable that the widening portion is provided in a plurality of portions in the direction in which the hardness adjustment member is removed.

In the cushion body of the above configuration, the first groove and the first adjustment member may have one widening portion, and the second groove and the second adjustment member may have two widening portions in the direction of removing the second adjustment member.

In the cushion body of the above configuration, it is preferable that a connection portion that can be cut in the extension direction of the second adjustment member is provided between the two widening portions of the second adjustment member and is less than the width of the tip end of the hardness adjustment member in the removal direction.

In the cushion body having the above configuration, it is preferable that the grooves are linear in plan view and are formed continuously from one peripheral end of the main body member to the opposing peripheral end.

In the cushion body having the above configuration, the main body member may further have a plurality of linear grooves on the front surface and/or back surface on which the groove is formed, in a direction intersecting the groove. Here, it is preferable that the depth of the linear grooves is shallower than the depth of the groove.

The present invention also provides a method for adjusting the hardness of the cushion body, which is characterized in that, in the cushion body described above, the hardness adjustment member is removed from the groove from the reference state to expose the groove and partially adjust the hardness of the cushion body.

In the cushion body having the above configuration, the hardness adjustment member may be cut at the cutout portion of the hardness adjustment member provided by the linear groove, and a portion of the hardness adjustment member may be removed from the groove to partially adjust the hardness of the cushion body.

The cushion body of the present invention allows the hardness of the desired part to be adjusted according to the user's preferences, and also reduces industrial waste in the manufacturing process compared to conventional methods.

1 is a perspective view of a cushion body according to one embodiment of the present invention. FIG. 2 is a partially enlarged perspective view of the cushion body of FIG. 1 . 2 is a perspective view of a first adjustment member in the cushion body of FIG. 1 . 2 is a perspective view of a second adjustment member in the cushion body of FIG. 1 . 13 is a perspective view showing an example in which a portion of a second adjustment member is cut away. FIG. 13 is a perspective view showing another example in which a portion of the second adjustment member is cut away. FIG. FIG. 2 is a cross-sectional view of a body member with a second adjustment member attached, with a portion cut away; 1 is a plan view of a mattress in which three cushion bodies of the first embodiment are connected in the X direction. FIG. FIG. 2 is a perspective view of a mattress in which three cushion bodies of FIG. 1 are connected together.

The cushion body according to the present invention will be described in detail below with reference to the drawings, but the present invention is not limited to these embodiments.
In this specification, the X direction, Y direction, and thickness direction refer to the X direction, Y direction, and thickness direction in each drawing. In addition, in this specification, a numerical range indicated using "to" indicates a range including the numerical values before and after "to" as the minimum and maximum values, respectively.

The cushion body C according to one embodiment of the present invention shown in Figs. 1 and 2 includes a main body member 1 having elasticity and a rectangular plate shape in a plan view, and a first adjustment member 2 and a second adjustment member 3 fitted into a linear first groove 11 and a linear second groove 12 extending in the X direction provided on the upper surface of the main body member 1. Both the first adjustment member 2 and the second adjustment member 3 constitute the hardness adjustment member of the present invention. In Fig. 2, the first adjustment member 2 and the second adjustment member 3 are colored gray to distinguish the first groove 11 and the second groove 12 and the first adjustment member 2 and the second adjustment member 3. In Fig. 7, the second adjustment member 3 is colored gray for the same reason.

(Main body member)
The main body member 1 is made of a material having elasticity. For example, urethane foam, latex, polyethylene, etc. are suitable. Among these, urethane foam is suitable from the viewpoints of body pressure dispersion and workability. As for urethane foam, one with a three-dimensional mesh structure without a cell membrane is recommended because it has the functions of breathability and water permeability. There is no particular limit to the thickness T of the main body member 1 (shown in FIG. 1), but it is usually preferable that it is in the range of 20 mm to 300 mm.

As shown in FIG. 1, first linear grooves 13 extending linearly in the Y direction are provided at a predetermined interval in the X direction on the upper surface in the thickness direction of the main body member 1, which is rectangular in plan view. Second linear grooves 14 extending linearly in the X direction are also provided at a predetermined interval in the Y direction. The upper surface of the main body member 1 is divided into a lattice shape by the first linear grooves 13 and the second linear grooves 14. The first linear grooves 13 and the second linear grooves 14 play a role in adjusting the hardness and breathability of the main body member 1. In terms of adjusting the hardness of the main body member 1, the harder the main body member 1 becomes, the shorter and deeper the intervals between the first linear grooves 13 and the second linear grooves 14 become.

There is no particular limitation on the spacing and depth of the first linear groove 13 and the second linear groove 14, and they may be appropriately determined so as to obtain the desired hardness in the reference state of the cushion body C described later. In this embodiment, the depth d1 of the first linear groove 13 is set to be shallower than the depth D1 of the first recessed groove 11 described later. The reason for this will be described later. Note that it is not necessary for either or both of the first linear groove 13 and the second linear groove 14 to be formed in the main body member 1, but from the viewpoint of providing breathability to the cushion body C, it is preferable that at least one of the first linear groove 13 and the second linear groove 14 is formed in the main body member 1.

As shown in Figs. 1 and 2, the upper surface of the main body member 1 is further provided with a plurality of linear first grooves 11 and second grooves 12 extending in the X direction at a predetermined interval L1 in the Y direction. A first adjustment member 2 and a second adjustment member 3 (both hardness adjustment members) having the same cross section as the cross section perpendicular to the X direction of the first grooves 11 and the second grooves 12 are fitted into all of the first grooves 11 and the second grooves 12.

In this specification, the state in which the first adjustment member 2 and the second adjustment member 3 are fitted into all of the first grooves 11 and the second grooves 12 is referred to as the "reference state." The first adjustment member 2 and the second adjustment member 3 are made of the same material as the main body member 1, and in the reference state, the first adjustment member 2 and the second adjustment member 3 are fitted into all of the first grooves 11 and the second grooves 12. Therefore, in the reference state, the first grooves 11 and the second grooves 12 are not apparent.

The first groove 11 and the second groove 12 are formed by two-dimensionally cutting a plate-like body having a thickness T, which is a precursor of the main body member 1. When the first groove 11 and the second groove 12 are formed by two-dimensional cutting, the first adjustment member 2 and the second adjustment member 3 remain as cut end materials inside the first groove 11 and the second groove 12. In other words, the first groove 11 and the first adjustment member 2, and the second groove 12 and the second adjustment member 3 are simultaneously formed by two-dimensional cutting. The reference state of the main body member 1 is the state after the main body member 1 is two-dimensionally cut. For example, a contour cutter is preferably used for two-dimensional cutting of the plate-like body, which is a precursor of the main body member 1. The first linear groove 13 and the second linear groove 14 are also preferably formed by two-dimensional cutting of the main body member 1. In addition, the first adjustment member 2 and the second adjustment member 3 may be made separately from the formation of the first groove 11 and the second groove 12. In this case, the first adjustment member 2 and the second adjustment member 3 can be made of a material different from that of the main body member 1.

(First groove 11, first adjustment member 2)
Due to the above-mentioned method of manufacturing the main body member 1, the cross-sectional shape perpendicular to the extension direction (X direction) of the first groove 11 and the cross-sectional shape perpendicular to the longitudinal direction (X direction) of the first adjustment member 2 are the same. Strictly speaking, the outer shape of the first adjustment member 2 is smaller than the inner shape of the first groove 11 by the thickness of the cutter blade (less than 1 mm), but since the difference between the outer shape and the inner shape is slight, they are considered to be the same in this specification. Below, the cross-sectional shape of the first adjustment member 2 will be described as a representative example.

2 and 3, the first adjustment member 2 has, from the tip side in the direction of removal from the main body member 1 (upward in the thickness direction), a narrow width portion 21 of width W1 and a wide width portion 22 whose maximum width W2 is wider than width W1. By having the wide width portion 22, the first adjustment member 2 is removable from the main body member 1, but is prevented from coming off the main body member 1 in undesired places.

The narrow portion has a width W1 and a desired length in the thickness direction. There is no particular limit to the width W1 of the narrow portion 21, but a range of 1 mm to 10 mm is usually preferred. There is also no particular limit to the length in the thickness direction of the narrow portion 21, but a range of 5 mm to 10 mm is usually preferred.

The cross-sectional shape of the widening portion 22 is an inverted triangle, with the width at the bottom in the thickness direction being the smallest and increasing continuously toward the top in the thickness direction, until it reaches its maximum width W2, at which point it narrows in width from both ends in the Y direction toward the center in a direction parallel to the Y direction and connects to the bottom end of the narrow portion 21 in the thickness direction. There is no particular limit to the maximum width W2 of the widening portion 22, as long as it is greater than the width W1 of the narrow portion 21, but from the viewpoint of allowing the first adjustment member 2 to be easily detached from the main body member 1 while not coming off in undesired places, it is preferable to set it 4 mm to 20 mm larger than the width W1 of the narrow portion 21. There is also no particular limit to the thickness direction length of the widening portion 22, but a range of 10 mm to 20 mm is usually preferable.

The first adjustment member 2 extends in the X direction, and multiple notches 24 are formed at intervals of length L2. The notches 24 have an X-direction width L3 and a depth d1. The depth d1 of the notches 24 is shallower than the depth D1 of the first adjustment member 2 (first groove 11). The notches 24 make the first adjustment member 2 a structure in which multiple first block bodies B1 of length L2 are connected in the X direction by the first connection portion 23. The difference between the depth D1 of the first adjustment member 2 and the depth d1 of the notches 24, i.e., the thickness direction length of the first connection portion 23, is not particularly limited as long as the first block bodies B1 can be cut by hand, and is usually preferably in the range of 2 mm to 5 mm. The length L3 of the first connection portion 23 in the X direction is also not particularly limited as long as the first block body B1 can be cut by hand, and is usually preferably in the range of 2 mm to 10 mm. The cutout portion 24 of the first adjustment member 2 is formed by forming the first linear groove 13 in the main body member 1 during the manufacture of the cushion body C.

The first adjustment member 2 having such a structure can be easily cut at the first connection portion 23 at the desired position, and the first adjustment member 2 can be divided into a plurality of first block bodies B1. When adjusting the hardness of the main body member 1, when removing only a portion of the first adjustment member 2 in the X direction from the main body member 1, first, the entire first adjustment member 2 is removed from the first groove 11 of the main body member 1. Then, the desired portion of the first adjustment member 2 is cut off using the first connection portion 23. After that, the first adjustment member 2 other than the cut-off portion is returned to the first groove 11 of the main body member 1. This allows only the desired portion of the first adjustment member 2 in the X direction to be removed from the main body member 1, and the hardness of that portion can be adjusted.

(Second groove 12, second adjustment member 3)
As with the first groove 11 and the first adjustment member 2, the second groove 12 and the second adjustment member 3 have the same cross-sectional shape perpendicular to the extension direction (X direction) of the second groove 12 and the cross-sectional shape perpendicular to the longitudinal direction (X direction) of the second adjustment member 3 due to the above-mentioned method of manufacturing the main body member 1. As mentioned above, strictly speaking, the outer shape of the second adjustment member 3 is smaller than the inner shape of the second groove 12 by the thickness of the cutter blade (less than 1 mm). Below, the cross-sectional shape of the second adjustment member 3 will be described as a representative example.

2 and 4, the second adjustment member 3 has, from the top in the thickness direction, a first narrow width portion 31 of width W1, a first wide width portion 32 of width W2, a second connection portion 33 of width W3, and second wide width portions 35 of width W2. In other words, the second adjustment member 3 has another wide width portion 35 on the bottom in the thickness direction of the first adjustment member 2 via the second connection portion 33. The first narrow width portion 31 of the second adjustment member 3 has the same shape as the narrow width portion 21 of the first adjustment member 2, and the first wide width portion 32 and the second wide width portion 35 of the second adjustment member 3 have the same shape as the wide width portion 22 of the first adjustment member 2, so a description will be omitted here and the configuration that differs from the first adjustment member 2 will be described below.

The second connection portion 33 of the second adjustment member 3 connects between the first widening portion 32 and the second widening portion 35 in a manner that can be cut by hand, as described below. There is no particular limit to the width W3 of the second connection portion 33, but a range of 1 mm to 10 mm is usually preferred. There is also no particular limit to the thickness direction length of the second connection portion 33, but a range of 5 mm to 10 mm is usually preferred.

The second adjustment member 3, like the first adjustment member 2, extends in the X direction and has multiple notches 34 formed at intervals of length L2. The notches 34 have a width of L3 in the X direction and a depth of d1. The depth d1 of the notches 34 is shallower than the combined depth of the first narrow portion 31 and the first wide portion 32. The notches 34 of the second adjustment member 3, like the notches 24 of the first adjustment member 2, are formed by forming a first linear groove 13 in the main body member 1 during the manufacture of the main body member 1.

The second adjustment member 3 having this structure can be cut in the thickness direction using the notches 34 at the desired positions, and the second adjustment member 3 can be divided into multiple second block bodies B2 (see Figure 5).

The second adjustment member 3 can also be cut in the X direction using the second connection portion 33 (see FIG. 6). That is, the second adjustment member 3 can be separated into upper and lower parts at the second connection portion 33. The upper part of the second adjustment member 3 separated into upper and lower parts has substantially the same shape as the first adjustment member 2, and can be separated into each first block body B1.

When adjusting the hardness of the main body member 1, when only a portion of the second adjustment member 3 in the X direction is to be removed from the main body member 1, the entire second adjustment member 3 is first removed from the second groove 12 of the main body member 1, as in the case of the first adjustment member 2. Then, the desired portion of the second adjustment member 3 is cut off. After that, the second adjustment member 3 other than the cut-off portion is returned to the second groove 12 of the main body member 1.

(Method of Adjusting Hardness of Main Body Member 1)
The hardness of the main body member 1 is adjusted, for example, as follows. From a reference state in which the first adjustment member 2 and the second adjustment member 3 are fitted into the first groove 11 and the second groove 12 of the main body member 1, the first adjustment member 2 and/or the second adjustment member 3 in the area in which the hardness of the main body member 1 is to be softened are removed from the main body member 1. The first adjustment member 2 and/or the second adjustment member 3 may be removed from the main body member 1 entirely or partially in the X direction. The hardness of the area of the main body member 1 from which the first adjustment member 2 and/or the second adjustment member 3 are removed becomes softer than the other areas. When removing the first adjustment member 2 and/or the second adjustment member 3, it is recommended to bend the upper surface of the main body member 1 into a convex shape so that the surface openings of the first groove 11 and the second groove 12 are expanded. This makes it easier to remove the first adjustment member 2 and/or the second adjustment member 3 from the main body member 1.

When removing the first adjustment member 2 and/or the second adjustment member 3 from the main body member 1, as described above, even if only a portion of the first adjustment member 2 and/or the second adjustment member 3 in the extension direction (X direction) is removed from the main body member 1, it is preferable to first remove the entire first adjustment member 2 and/or the second adjustment member 3 extending in the X direction from the main body member 1 from the standpoint of work efficiency, etc.

When removing a portion of the first adjustment member 2 in the X direction from the main body member 1, the entire X direction of the first adjustment member 2 is removed from the main body member 1, and then the desired portion of the first adjustment member 2 is cut off using the first connection portion 23. It is preferable to cut off the first block body B1 between the notches 24 as one unit. After that, the first adjustment member 2 other than the cut-off portion is attached to the first groove 11 of the main body member 1 in the reverse procedure to that used for removal.

When removing a portion of the second adjustment member 3 in the X direction from the main body member 1, the entire second adjustment member 3 in the X direction is removed from the main body member 1, and then the desired portion of the second adjustment member 3 is cut off. There are two types of partial cutting of the second adjustment member 3:

As shown in Figure 5, the first type is to cut the notches 34 downward in the thickness direction to separate and cut out a portion of the second adjustment member 3. It is preferable to cut out the second block body B2 between the notches 34 as one unit. After that, the second adjustment member 3 other than the cut-out portion is returned to the second groove 12 of the main body member 1 by following the procedure reverse to that for removal.

As shown in FIG. 6, the second type involves cutting the second connection portion 33 in the X direction to cut out a portion of the first narrow portion 21 and the first wide portion 22 from the second adjustment member 3. When cutting out in this manner, it is preferable to treat the first block body B1 between the notches 34 as a single unit. After that, the second adjustment member 3 other than the cut-out portion is returned to the second groove 12 of the main body member 1 in the reverse procedure to that used when removing it.

Figure 7 shows a cross-sectional view of the second adjustment member 3 with the first block body B1 and a portion of the second block body removed, attached to the second groove 12. Note that in Figure 7, the second adjustment member 3 is colored gray for ease of understanding. In the second adjustment member 3 in Figure 7, the second second block body from the right has been cut out, and the second first block body B1 from the left has been cut out.

As a procedure for adjusting the hardness of the main body member 1, in addition to the above-mentioned procedure, for example, when the entire X direction of the first narrow width portion 21 and the first wide width portion 22 of the second adjustment member 3 are removed from the main body member 1 and the entire X direction of the second wide width portion 35 of the second adjustment member 3 is left in the second groove 12, the entire X direction of the second adjustment member 3 is removed from the main body member 1, and then the first adjustment member 2 removed from another area may be attached to the second wide width portion 35 of the second groove 12. According to this method, the work of dividing the second adjustment member 3 into upper and lower parts at the second connection portion 33 is not necessary, and the work efficiency is improved.

(Example of use)
FIG. 8 shows an example of a mattress M using the cushion body C of the first embodiment. In the mattress M of FIG. 8, three cushion bodies C1, C2, and C3 (hereinafter, may be collectively referred to as "cushion body C") are connected in the X direction. In the area of each cushion body C where the user moves when turning over in bed, the first adjustment member 2 and/or the second adjustment member 3 are removed from the main body member 1, and the first groove 11 and/or the second groove 12 are exposed, making the hardness of the main body member 1 lower than that of other parts. The part where the second groove is exposed is softer than the part where the first groove 11 is exposed. In the mattress M shown in FIG. 8, the part where the first groove 11 or the second groove 12 is exposed is represented by a thick black line.

Specifically, the area where the shoulders and heels of a person lying on their back on the mattress M are located is made the softest by removing the second adjustment member 3 from the main body member 1 to expose the second groove 12. The area where the torso and thighs are located is made the second softest by removing the first adjustment member 2 from the main body member 1 to expose the first groove 11. On the other hand, the area where the head and waist are located is made the hardest by not removing the first adjustment member 2 and second adjustment member 3 from the main body member 1.

As shown in FIG. 9, in actual use, each cushion body C is stored in a cover 4 made of fabric or the like having a volume slightly larger than that of the cushion body C. A fastener 41 is provided vertically in the Y direction across the entire one side surface of the cover 4 in the X direction from the middle of one side surface in the Y direction to the middle of the other side surface in the Y direction. When the fastener 41 is opened, the opening of the cover 4 opens, and the cushion body C is stored in the cover 4. In addition, when the cushion body C is a laminate of a main body member 1 and another plate-like member, it is sufficient to store the main body member 1 and the plate-like member in the cover C, and there is no need to connect and fix the main body member 1 and the plate-like member.

The cushion bodies C stored in the cover 4 are connected to each other by a pair of connecting members 42a, 42b, which may be hook-and-loop fasteners or the like, provided on the upper and lower surfaces of the cover 4 at a predetermined distance apart in the Y direction. In the mattress M shown in FIG. 9, three cushion bodies C are connected in the X direction, but there is no limit to the number of cushion bodies C that can be connected. In addition, the cushion bodies C may be connected in the Y direction, or the cushion bodies C may be connected in two directions, the X direction and the Y direction.

In addition, the cushion body C of the present invention can be used as a mattress M, and can also be used as a cushion, etc.

(others)
Although the embodiments of the present invention have been described above in detail with reference to the drawings, the configurations and combinations thereof in the above-described embodiments are merely examples, and addition, omission, substitution, and other modifications of the configurations are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiments, but is limited only by the claims.

For example, in the above embodiment, the first groove 11 and the second groove 12 extend in the X direction at a predetermined interval in the Y direction, but they may extend in the Y direction at a predetermined interval in the X direction. Also, the first groove 11 and the second groove 12 may extend in two directions, the X direction and the Y direction. The first groove 11 and the second groove may be linear or curved. Also, the grooves formed in the main body member may be one type, or three or more types.

In the above embodiment, the shape of the main body member 1 in a plan view is rectangular, but there is no particular limitation on the shape of the main body member 1 in a plan view, and it may be polygonal, circular, or the like. In the above embodiment, the first linear groove 13 and the second linear groove 14 are provided only on the upper surface of the main body member 1, but they may be provided on both the upper and lower surfaces, or only on the lower surface. In addition, only one of the first linear groove 13 and the second linear groove 14 may be provided, or neither may be provided. Whether or not to provide the first linear groove 13 and the second linear groove 14 may be appropriately determined based on the hardness of the main body member 1 in the reference state, etc.

The cushion body C according to the present invention may have a structure in which another plate-like member is laminated in the thickness direction of the main body member 1. Examples of the member to be laminated include an elastic member having a different hardness from the cushion body and a mesh-like resin structure.

The cushion body of the present invention allows the hardness of the desired part to be adjusted according to the user's preferences, and also reduces industrial waste in the manufacturing process compared to conventional methods.

1 Main body member 2 First adjustment member (hardness adjustment member)
3. Second adjustment member (hardness adjustment member)
4 Cover C, C1, C2, C3 Cushion body M Mattress 11 First groove 12 Second groove 13 First linear groove 14 Second linear groove 21 Narrow width portion 22 Wide width portion 23 First connecting portion 24 Notch 31 Narrow width portion 32 First wide width portion 33 Second connecting portion 34 Notch 35 Second wide width portion B1 First block body B2 Second block body

Claims (13)

A plate-shaped cushion body including an elastic main body member and a plurality of hardness adjusting members,
The main body member has a plurality of linear grooves on at least one of a front surface and a back surface,
The hardness adjusting member is rod-shaped, and a cross-sectional shape perpendicular to a longitudinal direction of the hardness adjusting member is the same as a cross-sectional shape perpendicular to an extension direction of the groove,
In the reference state of the main body member, the hardness adjusting member is fitted into the recessed groove, and the recessed groove is not visible,
The cushion body is characterized in that the hardness adjusting member is removed from the groove to expose the groove, thereby allowing the hardness of the main body member to be partially adjusted. The direction in which the hardness adjusting member is removed from the groove is the thickness direction of the main body member,
2. The cushion body according to claim 1, wherein a cross-sectional shape perpendicular to the extending direction of the groove and a cross-sectional shape perpendicular to the longitudinal direction of the hardness adjusting member have a widened portion having a width greater than a width of a tip end of the hardness adjusting member in a removal direction. The cushion body according to claim 2, wherein the shape of the widening portion is such that the width at the rear end in the removal direction of the hardness adjustment member is smallest and increases continuously toward the tip end in the removal direction. The grooves have two or more types of grooves having different depths,
3. The cushion body according to claim 1, wherein the hardness adjusting member includes two or more types of hardness adjusting members corresponding to the two or more types of recessed grooves having different depths. The groove includes a first groove and a second groove that is deeper than the first groove,
5. The cushion body according to claim 4, wherein the hardness adjusting member has a first adjusting member corresponding to the first groove and a second adjusting member corresponding to the second groove. The cushion body according to claim 2 or 3, in which the widening portion is provided in a plurality of portions in the direction in which the hardness adjustment member is removed. The cushion body according to claim 5, wherein the first groove and the first adjustment member have one widening portion, and the second groove and the second adjustment member have two widening portions in the direction of removal of the second adjustment member. The cushion body according to claim 7, wherein a connection part that can be cut in the extension direction of the second adjustment member is provided between the two widened parts of the second adjustment member and is less than the width of the tip part of the hardness adjustment member in the removal direction. The cushion body according to claim 1 or 2, wherein, in a plan view, the groove is linear and is formed continuously from one peripheral end of the main body member to the opposing peripheral end. The cushion body according to claim 1 or 2, wherein the main body member further has a plurality of linear grooves on the front surface and/or back surface on which the grooves are formed, in a direction intersecting the grooves. The cushion body according to claim 10, wherein the depth of the linear groove is shallower than the depth of the concave groove. 3. The cushion body according to claim 1,
A method for adjusting the hardness of a cushion body, comprising removing the hardness adjusting member from the groove from the reference state to expose the groove and thereby partially adjusting the hardness of the cushion body. The cushion body according to claim 11,
A method for adjusting the hardness of a cushion body, comprising the steps of: cutting the hardness adjustment member at a notch portion of the hardness adjustment member defined by the linear groove; and removing a portion of the hardness adjustment member from the recessed groove to partially adjust the hardness of the cushion body.