JP7799596B2 - mattress - Google Patents

Description

The present invention relates to a mattress.

Mattresses are difficult to disassemble, and when discarded, they are often disposed of in landfills. However, in recent years, there has not been enough landfill space in Japan, and the country is struggling to find a way to dispose of the waste. As a result, there has been a demand for mattresses that are easy to disassemble and suitable for recycling.

For example, Patent Document 1 discloses a disassembly processing device used to separate the outer body and spring unit of a mattress. Furthermore, Patent Document 2 discloses a mattress structure designed to be easily disassembled.

Patent No. 3459221 Japanese Patent Application Publication No. 9-191976

Even considering the above-mentioned Patent Documents 1 and 2, there is still room for improvement in the technology for dismantling mattresses. Therefore, one of the objects of the present invention is to provide a mattress that can improve work efficiency during dismantling.

A mattress according to one aspect of the present invention comprises a spring unit having a plurality of coils and a wall member surrounding the spring unit. The spring unit has a lower portion including a first edge and an upper portion including a second edge and positioned opposite the lower portion, and the first edge and the second edge have portions without borders.

The spring unit may have frame lines provided on at least a portion of the first edge and the second edge. The spring unit may be formed in a substantially rectangular parallelepiped shape that is elongated in the longitudinal direction, the first edge having a pair of first short edges aligned in the longitudinal direction and a pair of first long edges aligned in a width direction perpendicular to the longitudinal direction, and the second edge having a pair of second short edges aligned in the longitudinal direction and a pair of second long edges aligned in the width direction. The frame lines may be provided on each of the pair of first short edges and the pair of second short edges, and the portions without the frame lines may be located on each of the pair of first long edges and the pair of second long edges.

The mattress may further include a first sheet material provided between the spring unit and the wall member and surrounding the sides of the spring unit, and a second sheet material provided between the portion without the frame line and the first sheet material.

The mattress may further include a string-like member located between the spring unit and the outer peripheral surface of the wall member and extending along the outer periphery of the spring unit, the string-like member having an end protruding from the outer peripheral surface. The wall member may be formed from foam.

This invention provides a mattress that can improve work efficiency during dismantling.

FIG. 1 is a schematic perspective view of a mattress according to one embodiment. FIG. 2 is an enlarged schematic perspective view showing the vicinity of the tab shown in FIG. FIG. 3 is a perspective view schematically showing a scene in the mattress dismantling process. FIG. 4 is a schematic perspective view of an inner body of the mattress. FIG. 5 is a schematic cross-sectional view of the inner body taken along line VV shown in FIG. FIG. 6 is a schematic cross-sectional view of the inner body taken along the line VI-VI shown in FIG. FIG. 7 is a schematic exploded perspective view showing the spring unit, the first sheet material, and the second sheet material. FIG. 8 is a schematic plan view of the inner body of the mattress. FIG. 9 is a schematic plan view of the inner body of the mattress. 10A to 10C are schematic cross-sectional views illustrating steps involved in forming the wall member. FIG. 11 is a diagram showing measurement points in a vertical load test.

An embodiment will be described with reference to the drawings.
In the following description, the "upper surface" of each element constituting the mattress refers to the surface facing the person sitting on it when the mattress is in use, and the "lower surface" of each element refers to the surface facing the floor when the mattress is in use. Also, the "side peripheral surface,""outer peripheral surface," and "inner peripheral surface" of each element refer to the surfaces connecting the upper and lower surfaces.

Each figure shows the X-axis, Y-axis, and Z-axis, which are perpendicular to each other. The direction along the X-axis is defined as the first direction X, the direction along the Y-axis is defined as the second direction Y, and the direction along the Z-axis is defined as the third direction Z.

In this embodiment, the first direction X corresponds to the width direction of the mattress 1, and the second direction Y corresponds to the longitudinal direction of the mattress 1. Viewing the mattress 1 parallel to the third direction Z is called a plan view.

Figure 1 is a schematic perspective view of a mattress 1 according to this embodiment. The mattress 1 has, for example, a generally rectangular parallelepiped shape that is elongated in the second direction Y. The shape of the mattress 1 in a plan view has short sides that run along the first direction X and long sides that run along the second direction Y. In this case, the four corners of the mattress 1 may be smoothly curved (R-shaped).

The mattress 1 comprises an exterior body 2, an edge tape 3, and a tab 4 (tension tape). The exterior body 2 has a first portion 21 that covers the bottom and side surfaces of the interior body 5 (see Figure 3) placed inside it, and a second portion 22 that covers the top surface of the interior body 5. Both the first portion 21 and the second portion 22 are made of fabric material. The first portion 21 and the second portion 22 may be quilted.

The edge tape 3 connects the first portion 21 and the second portion 22, thereby closing the outer casing 2 into a bag shape. The edge tape 3 has a generally rectangular shape in plan view, with a short side aligned in the first direction X and a long side aligned in the second direction Y. The tab 4 is located approximately in the center of the short side of the edge tape 3.

Figure 2 is a schematic perspective view showing an enlarged view of the tab 4 and its vicinity. The edge tape 3 is sewn to the peripheral edges of the first portion 21 and the second portion 22 by a pair of parallel stitching lines L.

The edge tape 3 has a first end 31 and a second end 32. The first end 31 is the end where sewing begins when sewing the edge tape 3 to the first part 21 and the second part 22, and includes the area nearby. The second end 32 is the end where sewing ends when sewing the edge tape 3 to the first part 21 and the second part 22, and includes the area nearby.

The second end 32 overlaps the outside of the first end 31. In other words, the first end 31 is located between the exterior body 2 and the second end 32. This forms a region R where the first end 31 and the second end 32 overlap.

Tab 4 is, for example, loop-shaped, and partially overlaps region R. Tab 4 also overlaps the portion of second end 32 excluding region R (the portion to the right of region R in the figure), but does not overlap the portion of first end 31 excluding region R (the portion to the left of region R in the figure).

In the example shown in Figure 2, tab 4 overlaps only one of the pair of suture lines L, but not the other. Tab 4 is positioned below second end 32 (on the first portion 21 side), and is preferably located between first end 31 and second end 32 in region R.

The edge tape 3 is sewn to the exterior body 2 from the sewing start edge along the sewing direction DL. When this sewing operation reaches the second end 32, the tab 4 is sewn to the exterior body 2 together with the second end 32.

The edge tape 3 and tab 4 configured as described above contribute to smoother removal of the outer covering 2 when dismantling the mattress 1. This effect will be explained using Figures 2 and 3.

Figure 3 is a perspective view that shows a schematic diagram of one stage in the dismantling of the mattress 1. When dismantling the mattress 1, the tab 4 is pulled and torn off from the edge tape 3 as shown in the figure. At this time, the bobbin thread that sews the second end 32 of the edge tape 3 to the exterior body 2 breaks. This makes it easier to peel the second end 32 from the exterior body 2.

Then, the edge tape 3 is pulled in the pulling direction DR (opposite the sewing direction DL) shown in Figures 2 and 3 and peeled off from the exterior body 2. When peeling is completed up to the first end 31, the first portion 21 and second portion 22 of the exterior body 2 are completely separated. This makes it possible to remove the interior body 5 placed inside the exterior body 2.

Next, the structure of the inner body 5 will be explained with reference to Figures 4 to 9.

Figure 4 is a schematic perspective view of the inner body 5 included in the mattress 1. Figure 5 is a schematic cross-sectional view of the inner body 5 taken along line V-V shown in Figure 4. Figure 6 is a schematic cross-sectional view of the inner body 5 taken along line VI-VI shown in Figure 4. Figure 7 is a schematic exploded perspective view showing the spring unit 6, first sheet material 81, and second sheet materials 82A and 82B. Figures 8 and 9 are schematic plan views of the inner body 5 included in the mattress 1. In Figure 5, the inner body 5 is viewed in the first direction X, and in Figure 6, the inner body 5 is viewed in the second direction Y. In Figures 8 and 9, the protective materials 71A and 71B and cushioning materials 72A and 72B are not shown. Figure 8 views the inner body 5 in the third direction Z.

As shown in FIG. 4, the inner body 5 has an upper surface FA and a lower surface FB. The inner body 5 has, for example, a generally rectangular parallelepiped shape that is elongated in the second direction Y. The inner body 5 has four corners C1, C2, C3, and C4. The corners C1, C2, C3, and C4 may be smoothly curved (R-shaped).

As shown in Figures 4 to 9, the interior body 5 includes a spring unit 6, protective materials 71A and 71B, cushion materials 72A and 72B, a first sheet material 81, second sheet materials 82A and 82B, and a wall member 9.

As shown in Figures 5 and 6, protective material 71A is arranged on the upper surface of spring unit 6, and protective material 71B is arranged on the lower surface of spring unit 6. Cushion material 72A is arranged on the upper surface of protective material 71A, and cushion material 72B is arranged on the lower surface of protective material 71B. Protective materials 71A and 71B are formed, for example, from felt, sisal, or compressed cotton. Cushion materials 72A and 72B are formed, for example, from a foam such as urethane foam.

In the example shown in Figure 7, the spring unit 6 is formed in a generally rectangular parallelepiped shape that is elongated in the second direction Y. The spring unit 6 has a lower portion 61 and an upper portion 62 located opposite the lower portion 61. The lower portion 61 includes a first edge 610 located on the outer periphery. The upper portion 62 includes a second edge 620 located on the outer periphery.

As shown in FIG. 8, the first edge 610 has a pair of first short edges 611, 612 aligned in the second direction Y and a pair of first long edges 613, 614 aligned in the first direction X. As shown in FIG. 9, the second edge 620 has a pair of second short edges 621, 622 aligned in the second direction Y and a pair of second long edges 623, 624 aligned in the first direction X.

In the example shown in Figures 8 and 9, the spring unit 6 has multiple spring bodies 64. The multiple spring bodies 64 are aligned in the second direction Y. The spring body 64 has multiple coils 641 made of a single wire such as a steel wire, with their axes aligned substantially parallel to one another.

The multiple spring bodies 64 are connected by multiple helical wires 65. The multiple helical wires 65 extend in the second direction Y and are aligned in the first direction X. The helical wires 65 are wound around the upper and lower ends of the coils 641 of adjacent spring bodies 64, respectively. This connects the adjacent spring bodies 64.

The configuration of the spring unit 6 is not limited to the above example. The spring unit 6 may be composed of, for example, multiple spring bodies 64 aligned in the first direction X. In this case, adjacent spring bodies 64 are connected by multiple helical wires 65 extending in the first direction X and aligned in the second direction Y.

The spring unit 6 further has frame lines 66, 67, 68, and 69. The frame lines 66, 67, 68, and 69 are, for example, generally U-shaped. The frame lines 66, 67, 68, and 69 are provided on at least a portion of the first edge 610 and the second edge 620. In the example shown in Figures 7 to 9, the frame lines 66 and 67 are provided on the pair of first short edges 611 and 612, and the frame lines 68 and 69 are provided on the pair of second short edges 621 and 622. In other words, the frame lines 66, 67, 68, and 69 are provided on the short sides of the upper and lower surfaces of the mattress 1, respectively.

Furthermore, frame lines 66 and 67 are also provided on parts of the first long edges 613 and 614, and frame lines 68 and 69 are also provided on parts of the second long edges 623 and 624. In other words, frame lines 66 and 67 are also provided on corners of the first edge 610, and frame lines 68 and 69 are also provided on corners of the second edge 620. Note that frame lines 66 and 67 do not have to be provided on the first long edges 613 and 614, and frame lines 68 and 69 do not have to be provided on the second long edges 623 and 624.

Ends 66a, 67a, 68a, and 69a of frame lines 66, 67, 68, and 69 are bent toward the inside of spring unit 6. In other words, the tips of ends 66a, 67a, 68a, and 69a of frame lines 66, 67, 68, and 69 protrude into the inside of spring unit 6.

In terms of the first edge 610 and the second edge 620, the first edge 610 has a portion where the frame lines 66 and 67 are not provided, and the second edge 620 has a portion where the frame lines 68 and 69 are not provided.

The portion of the pair of first long edges 613, 614 where frame lines 66, 67 are not provided is designated as portion NP1, and the portion of the pair of second long edges 623, 624 where frame lines 68, 69 are not provided is designated as portion NP2. Portion NP1 is located on each of the pair of first long edges 613, 614, and portion NP2 is located on each of the pair of second long edges 623, 624.

Portion NP1 is located between end 66a of frame line 66 and end 67a of frame line 67 in the second direction Y, and portion NP2 is located between end 68a of frame line 68 and end 69a of frame line 69 in the second direction Y.

The length in the second direction Y of portion NP1 is greater than the length in the second direction Y of the portions of the first long edges 613, 614 other than portion NP1. The length in the second direction Y of portion NP2 is greater than the length in the second direction Y of the portions of the second long edges 623, 624 other than portion NP2. The length in the second direction Y of portion NP1 is, for example, equal to the length in the second direction Y of portion NP2. The length in the second direction Y of portion NP1 may be different from the length in the second direction Y of portion NP1.

The frame lines 66, 67, 68, and 69 are formed from a hard material such as steel or hard synthetic resin. The thickness of the wire material forming the frame lines 66, 67, 68, and 69 is greater than, for example, the thickness of the wire material forming the spring body 64 and the thickness of the wire material forming the helical wire 65.

The wire forming the frame lines 66, 67, 68, and 69 has a diameter of, for example, 3 mm or more. In one example, the diameter is 3.5 mm. The frame lines 66, 67, 68, and 69 are each connected to the spring body 64 by multiple clips (not shown).

The wall member 9 surrounds the spring unit 6, protective materials 71A, 71B, and cushion materials 72A, 72B, sandwiching the first sheet material 81 and the second sheet materials 82A, 82B between them. The wall member 9 has, for example, a frame shape.

More specifically, the long side and short side portions of the wall member 9 are integrally formed. The length of the wall member 9 in the third direction Z is greater than the length of the spring unit 6 in the third direction Z, for example.

The wall member 9 is formed from a foam such as cold foam. The material used to form the foam is, for example, urethane. The wall member 9 is a relatively hard foam. The foam used to form the wall member 9 is harder than the first sheet material 81 and the second sheet materials 82A and 82B, for example. The wall member 9 does not have to be made from a foam, and may be made from other resin materials, etc.

The wall member 9 has an inner circumferential surface 90 facing the spring unit 6 and an outer circumferential surface 91 located on the opposite side of the inner circumferential surface 90. In this configuration of the interior body 5, the cushion material 72A and the upper surface of the wall member 9 correspond to the upper surface FA of the interior body 5, and the cushion material 72B and the lower surface of the wall member 9 correspond to the lower surface FB of the interior body 5.

The wall member 9 may have, for example, a slit 92 (see Figure 4). The slit 92 is formed from the outer peripheral surface 91 toward the spring unit 6. In the example shown in Figure 5, the slit 92 extends from the outer peripheral surface 91 to the inner peripheral surface 90. However, the slit 92 may also be formed in the range from the outer peripheral surface 91 to just before the inner peripheral surface 90.

The position of the slits 92 in the third direction Z is equivalent to the position in the third direction Z of the boundary between the spring unit 6 and the protective material 71A in the example shown in FIG. 5. In the example shown in FIG. 4, the slits 92 are provided at each of the corners C1, C2, C3, and C4. Between adjacent slits 92, the wall member 9 is connected at the portion located above the slits 92 and the portion located below the slits 92.

The slits 92 may be provided at one, two, or three of the corners C1, C2, C3, and C4. The slits 92 may also be provided at positions other than the corners C1, C2, C3, and C4.

The first sheet material 81 is provided between the spring unit 6 and the wall member 9. The first sheet material 81 surrounds the side of the spring unit 6, the protective materials 71A and 71B, and the side surfaces of the cushion materials 72A and 72B. The outer surface of the first sheet material 81 contacts, for example, the inner surface 90.

The second sheet materials 82A, 82B extend in the second direction Y and are arranged side by side in the first direction X. The second sheet materials 82A, 82B are generally U-shaped. The second sheet material 82A has a long side 84A extending along the second direction Y and short sides 85A, 86A extending along the first direction X. The second sheet material 82B has a long side 84B extending along the second direction Y and short sides 85B, 86B extending along the first direction X.

The long side portion 84B, spring unit 6, and long side portion 84A are aligned in this order in the first direction X. The long side portions 84A and 84B each have a portion located between portions NP1 and NP2 and the first sheet material 81 in the first direction X.

The short side portion 86A, spring unit 6, and short side portion 85A are arranged in this order in the second direction Y, and the short side portion 86B, spring unit 6, and short side portion 85B are arranged in this order in the second direction Y.

In other words, the short sides 85A and 85B are located between the frame lines 66 and 68 and the first sheet material 81 in the second direction Y, and the short sides 86A and 86B are located between the frame lines 67 and 69 and the first sheet material 81 in the second direction Y.

The short side portion 85A is spaced apart from the short side portion 85B in the first direction X, and the short side portion 86A is spaced apart from the short side portion 86B in the first direction X. In other words, the spring unit 6 has a portion NP3 in the second direction Y that does not overlap with the second sheet materials 82A and 82B.

The first sheet material 81 and the second sheet materials 82A and 82B are formed, for example, from a foam such as urethane foam. The thickness of the first sheet material 81 is, for example, smaller than the thickness of the second sheet materials 82A and 82B. The thickness of the first sheet material 81 may be larger than the thickness of the second sheet materials 82A and 82B, or may be equal to the thickness of the second sheet materials 82A and 82B.

As shown in Figure 4, the mattress 1 may further include a string-like member S10. In one example, the string-like member S10 is formed from silk, but this example is not limiting. The cross-sectional shape of the string-like member S10 is circular in one example, but may also be rectangular or another shape.

The string-like member S10 is provided along the outer periphery of the spring unit 6. For example, the string-like member S10 may be provided along the entire outer periphery of the spring unit 6, or along only a portion of the outer periphery of the spring unit 6.

The string-shaped member S10 is located between the spring unit 6 and the outer peripheral surface 91 of the wall member 9. As shown in Figures 5 and 6, the string-shaped member S10 may be provided inside the wall member 9. In this case, the string-shaped member S10 is located, for example, on the inner peripheral surface 90 side inside the wall member 9. In another example, the string-shaped member S10 may be provided between the wall member 9 and the first sheet material 81.

The string-shaped member S10 has an end S10a that protrudes from the outer peripheral surface 91. In the example shown in Figure 4, the end S10a protrudes from a slit 92 in the wall member 9. The end S10a may also protrude from a portion of the outer peripheral surface 91 other than the slit 92.

End S10a only needs to be long enough for the user to hold it. End S10a functions as a grip when dismantling the mattress 1. The end (not shown) of the string-shaped member S10 opposite end S10a may be connected to the spring unit 6 or to a member other than the spring unit 6.

A single string-shaped member S10 may be provided along the outer periphery of the spring unit 6, or multiple string-shaped members S10 may be provided along the outer periphery of the spring unit 6. When multiple string-shaped members S10 are provided, multiple end portions S10a may protrude from the outer periphery surface 91.

Here, the steps relating to the formation of the wall members 9 in the manufacturing method of the mattress 1 will be described.
10 is a schematic cross-sectional view showing the steps involved in forming the wall member 9. When forming the wall member 9, a laminated body M is placed on a workbench 100. The laminated body M is formed by stacking cushion material 72B, protective material 71B, spring unit 6, protective material 71A, and cushion material 72A in this order. Furthermore, a first sheet material 81 and second sheet materials 82A and 82B are provided on the outer periphery of the laminated body M.

The workbench 100 is provided with multiple frame bodies 110. The frame bodies 110 are connected to the ends of the workbench 100, for example, by hinges, and can rotate from a reclined position as shown by the dashed lines to an upright position as shown by the solid lines.

The frame body 110 is formed from, for example, a metal material, a resin material, or wood. The frame body 110 is provided on each of the four sides of the laminated body M. When the frame body 110 is erected, the side surfaces of the laminated body M are surrounded by the frame body 110.

At this time, a gap G is formed between the frame 110 and the laminate M. With the frame 110 in an upright position, a liquid agent Q, which will become the base of the wall member 9, is injected into the gap G. The liquid agent Q injected into the gap G foams, forming the wall member 9.

As a result, the long side and short side portions of the wall member 9 are integrally formed. The work table 100 and the laminate M may be temperature-controlled at a predetermined temperature, for example, before, during, and after the injection of the liquid agent Q.

Although not shown, multiple plates for forming the slits 92 may be further arranged on the workbench 100. The multiple plates may be made of, for example, plastic. After the wall member 9 is formed, each plate is removed, thereby forming slits 92 in the wall member 9 according to the shape of the plate. Although not shown, the string-like member S10 described with reference to Figure 4 may be arranged in the gap G. In this way, the string-like member S10 is provided inside the wall member 9.

After the wall members 9 are formed, the frame 110 is removed. This forms the inner body 5, which integrates the wall members 9 with the spring unit 6 and other components. The mattress 1 is then completed through processes such as connecting the inner body 5 to the first part 21 and second part 22 of the outer body 2 with edge tape 3.

When dismantling the mattress 1, as explained using Figure 3, the edge tape 3 is peeled off from the exterior body 2, the first portion 21 and the second portion 22 are separated, and the interior body 5 is removed. Next, the protective material 71A and cushioning material 72A are separated from the spring unit 6 and wall member 9. When the protective material 71A and cushioning material 72A are separated, the top surface of the spring unit 6 is exposed. In this state, the spring unit 6 can be removed.

With the mattress 1 configured as described above, the first edge 610 of the spring unit 6 has portion NP1, and the second edge 620 has portion NP2. Therefore, when disassembling the removed spring unit 6, there is no need to cut the frame lines at portions NP1 and NP2.

When a frame line is created around the entire periphery of the spring unit, it becomes necessary to cut the frame line. Because the wire that forms the frame line is thick, it is difficult to cut the frame line with commercially available tools. As a result, it took a long time to dismantle the spring unit.

The wire that forms the spring body 64 and helical wire 65 of the spring unit 6 is thinner than the wire that forms the frame wire. This allows the user to easily cut the wire that forms the spring body 64 and helical wire 65.

The spring unit 6 can be disassembled into multiple parts by cutting the wire that forms the spring body 64 and helical wire 65 without cutting the frame line. In this way, this embodiment can improve work efficiency when dismantling the mattress 1.

For example, large spring units can be difficult to load into a car or other vehicle when discarded. With the mattress 1 according to this embodiment, the spring unit 6 can be disassembled to the desired size without cutting the frame lines. In other words, the user can disassemble the spring unit 6 to a size that can be loaded into a car or other vehicle, and then dispose of it.

In this embodiment, the pair of first long edges 613, 614 have portion NP1, and the pair of second long edges 623, 624 have portion NP2. Therefore, when disassembling, the spring unit 6 can be cut along the first direction X. For example, the user can disassemble the spring unit 6 into multiple parts by cutting the multiple helical wires 65 aligned in the first direction X.

As such, with the mattress 1 according to this embodiment, the frame lines 66, 67, 68, and 69 are less likely to get in the way when dismantling the spring unit 6, allowing for efficient dismantling of the mattress 1.

In this embodiment, the mattress 1 includes a wall member 9. The wall member 9 is made of a relatively hard material. Here, we show the results of a vertical load test specified in JIS S 1102 "Ordinary Beds for Residential Use."

Figure 11 is a diagram showing the measurement points in a vertical load test. In the example shown in Figure 11, the upper side of the figure corresponds to the head side, and the lower side of the figure corresponds to the head side. As shown in Figure 11, the measurement points in a vertical load test are the first measurement point A1, the second measurement point A2, and the third measurement point A3. The second measurement point A2 corresponds to approximately the center of the mattress.

These measurement points A1, A2, and A3 are located approximately in the center of the mattress in the second direction Y. In the case of the mattress 1 according to this embodiment, these measurement points A1, A2, and A3 overlap with portions NP1 and NP2 in the first direction X. In other words, the first measurement point A1 and the third measurement point A3 are included in portions NP1 and NP2 of the spring unit 6 and their surrounding areas.

In the vertical load test, force is applied using a pressure plate. The pressure plate has a diameter of 20 cm. In this case, the pressure plate applies force to the wall member and spring unit at the first measurement point A1 and the third measurement point A3.

Based on the above standard, the deflection increase D1 at the first measurement point A1, the second measurement point A2, and the third measurement point A3 is calculated using the following formula:
[Formula] D1=δ350-δ150
In the formula, δ150 is the deflection (mm) when a load of 150N is applied, and δ350 is the deflection (mm) when a load of 350N is applied.

The test results for mattress 1 showed that the deflection increase D1 at the first measurement point A1 was 27 mm, the deflection increase D1 at the second measurement point A2 was 31 mm, and the deflection increase D1 at the third measurement point A3 was 30 mm.

In the mattress 1 according to this embodiment, it was confirmed that there was almost no difference in the deflection increase D1 between measurement points A1, A2, and A3. Because the mattress 1 includes a wall member 9 that surrounds the spring unit 6, the first measurement point A1 and the third measurement point A3 have the same degree of hardness as the second measurement point A2.

The mattress in the comparative example has a frame around the entire periphery of the spring unit. In other words, the spring unit of the mattress in the comparative example does not have portions NP1 and NP2.

The test results for the mattress of the comparative example showed that the deflection increase D1 at the first measurement point A1 was 24 mm, the deflection increase D1 at the second measurement point A2 was 28 mm, and the deflection increase D1 at the third measurement point A3 was 26 mm.

It was confirmed that Mattress 1 had the same increase in deflection D1 at each measurement point A1, A2, and A3 as the mattress of the comparative example. In other words, Mattress 1 had the same degree of hardness at each measurement point A1, A2, and A3 as the mattress of the comparative example.

In other words, it was confirmed that the firmness of the mattress 1 is maintained in the portions NP1 and NP2 of the spring unit 6 and their vicinity. More specifically, the mattress 1 is able to maintain the shape of the spring unit 6 in the portions NP1 and NP2 of the spring unit 6 and their vicinity.

Mattress 1 can prevent unnatural sinking in portions NP1 and NP2 and their vicinity. This allows mattress 1 to provide a sleeping comfort equivalent to that of the mattress in the comparative example. Therefore, mattress 1 of this embodiment can improve work efficiency during disassembly while ensuring sleeping comfort.

Furthermore, with the mattress 1, the wall members 9 allow use of the mattress 1 all the way to its outer periphery. In other words, it is possible to ensure a large area (effective area) of the top surface of the mattress 1 that can be used by the user.

The spring unit 6 has frame lines 66, 67, 68, and 69 provided on the pair of first short edges 611, 612 and the pair of second short edges 621, 622. This prevents the spring body 64 of the spring unit 6 from becoming entangled at the pair of first short edges 611, 612 and the pair of second short edges 621, 622 when the spring unit 6 sinks.

The wall member 9 has a slit 92. As a result, when dismantling the mattress 1, by lifting the end of the wall member 9 on the upper surface FA side near the slit 92, the wall member 9 can be easily torn starting from the slit 92. This makes it possible to separate the wall member 9 into an upper surface side and a lower surface side. As a result, dismantling the mattress 1 can be done more efficiently.

When the string-like member S10 described with reference to Figure 4 is provided, by pulling the end S10a of the string-like member S10, the string-like member S10 cuts the wall member 9, and the wall member 9 can be separated into an upper surface side and a lower surface side. In particular, when the string-like member S10 is provided around the entire outer periphery of the spring unit 6, the entire wall member 9 can be separated into an upper surface side and a lower surface side.

The mattress 1 comprises a first sheet material 81 and second sheet materials 82A and 82B. The first sheet material 81 and the second sheet materials 82A and 82B prevent the liquid agent Q from flowing into the spring unit 6 during the process of forming the wall member 9.

Gaps are particularly likely to occur near portions NP1 and NP2 of the laminate M. In this embodiment, second sheet materials 82A and 82B are provided between portions NP1 and NP2 and the first sheet material 81. This makes it less likely for gaps to form, and reliably prevents the liquid agent Q from flowing into the spring unit 6.

The above embodiments do not limit the scope of the present invention to the configurations disclosed in the embodiments. The present invention can be implemented by modifying the configurations disclosed in the present embodiments in various ways.

A mattress can also be constructed by combining the outer body 2 in the above embodiment with an inner body having a different structure from that of the above embodiment. Also, a mattress can be constructed by combining the inner body 5 in the above embodiment with an outer body having a different structure from that of the above embodiment. The spring unit 6 can be constructed, for example, from multiple (e.g., two or three) blocks divided in the second direction Y.

In this embodiment, portions NP1 and NP2 are located on a pair of first long edges 613 and 614 and a pair of second long edges 623 and 624, but frame lines may be provided so that portions NP1 and NP2 are located on a pair of first short edges 611 and 612 and a pair of second short edges 621 and 622.

1... mattress, 2... exterior body, 3... edge tape, 4... tab, 5... interior body, 6... spring unit, 9... wall member, 61... lower part, 62... upper part, 66, 67, 68, 69... frame lines
71A, 71B...protective material, 72A, 72B...cushion material, 81...first sheet material, 82A, 82B...second sheet material, 610...first edge, 611, 612...first short edge, 613, 614...first long edge, 620...second edge, 621, 622...second short edge, 623, 624...second long edge, 641...coil, NP1, NP2...portion, S10...string-shaped member, S10a...end portion.

Claims (3)

a spring unit formed in a substantially rectangular parallelepiped shape that is long in the longitudinal direction and has a plurality of coils;
a wall member surrounding the spring unit;
a first sheet material provided between the spring unit and the wall member and surrounding a side portion of the spring unit;
a second sheet material ,
The spring unit is
a lower portion including a first edge including a pair of first short edges aligned in the longitudinal direction and a pair of first long edges aligned in a width direction perpendicular to the longitudinal direction;
an upper portion located opposite the lower portion and including a second edge including a pair of second short edges aligned in the longitudinal direction and a pair of second long edges aligned in the width direction;
frame lines provided on the pair of first short edges and the pair of second short edges;
and
the pair of first long edges and the pair of second long edges each have a portion where the frame line is not provided,
The second sheet material is provided between the portion where the frame line is not provided and the first sheet material.
mattress. a string-shaped member positioned between the spring unit and the outer circumferential surface of the wall member and provided along the outer periphery of the spring unit;
The string-like member has an end portion protruding from the outer circumferential surface.
The mattress of claim 1. The wall member is formed of a foam.
3. A mattress according to claim 1 or 2 .