Mattress

Abstract

To prevent a mattress with a built-in coil spring from becoming dirty by liquid infiltrating the mattress.SOLUTION: A mattress 10 includes: a plurality of coil springs 11, 11 ... which are stretchable in a vertical direction as a longitudinal direction to be a thickness direction of the mattress and are arranged in parallel in a back and forth direction and a horizontal direction, and freely bendable sheets 21 composing vertically elongated pockets in which each of the coil springs 11 is encapsulated. The sheets 21 contain waterproof layers covering fabric knitted with synthetic fiber yarns and the surface of the fabric or soft vinyl chloride sheets.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a mattress that is laid on a floor or bed and supports the body of a user in a lying position from below. [Background technology]

[0002] Mattresses that support infants or adults in supine, lateral, prone, or other lying positions from below are stationary and not intended for portability, and are typically one or two sizes larger than the body shape of the infant or adult using them. Typical mattresses typically have front-to-back dimensions ranging from 70 cm to 220 cm, left-to-right dimensions ranging from 50 cm to 170 cm, and up-to-down dimensions ranging from 5 cm to 25 cm. Furthermore, mattresses typically include urethane or other elastic foam sponges, coil springs, etc., in the central thickness region, and fabric material is spread across the entire upper and lower surfaces on both sides of the thickness to completely cover the urethane, sponge, coil springs, etc. A detailed structure of a mattress including a coil spring is known, for example, from JP 2021-194034 A (Patent Document 1). The detailed structure of the mattress described in Patent Document 1 includes a number of coil springs and a nonwoven fabric that wraps around these coil springs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-194034 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the inventors have discovered that the detailed structure of the above-described conventional mattresses requires further improvement. Specifically, in nursing homes and care facilities, mattress users may spill large amounts of liquid on the mattress surface. The liquid penetrates the fabric on the mattress surface, passes through the nonwoven fabric, and soaks deep into the mattress. In such cases, cleaning the mattress requires an excessive amount of effort. Because mattresses are larger than the human body and are stationary structures assembled with metal coil springs, washing a mattress in a washing machine is not practical. Furthermore, moisture in the liquid may cause rust or corrosion of the coil springs.

[0005] SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, an object of the present invention is to provide a mattress with built-in coil springs that does not allow liquid to soak in even if a large amount of liquid is spilled on it. [Means for solving the problem]

[0006] For this purpose, the mattress of the present invention comprises a number of coil springs that are expandable with the vertical direction as the longitudinal direction and arranged in parallel in the front-to-back and left-to-right directions, and a flexible sheet that forms vertically elongated pockets into which the coil springs are individually enclosed. The sheet includes a fabric woven from synthetic fiber yarn and a waterproof layer covering the surface of the fabric, or is a soft vinyl chloride sheet.

[0007] According to the present invention, the sheet blocks water and other liquids, preventing them from penetrating the pockets and improving the stain resistance of the mattress. Therefore, even if a mattress user accidentally spills a large amount of liquid on the mattress, cleaning the mattress becomes easier. Furthermore, liquids do not soak into the sheet, preventing the coil springs in the pockets from rusting or corroding. Furthermore, woven fabrics are more resistant to friction than nonwoven fabrics, improving the durability of the mattress.

[0008] The sheet may be any flexible woven fabric, and the type of synthetic fiber yarn is not particularly limited. The synthetic fiber may be one or more types of fibers selected from nylon, aramid, vinylon, polyvinylidene chloride, polyvinyl chloride, polyester, polyacrylonitrile, acrylic, polyethylene, polypropylene, polyurethane, polychlor fiber, and polylactic acid fiber. Alternatively, the sheet may be a soft vinyl chloride sheet. In one aspect of the present invention, the woven fabric contained in the sheet is a polyester woven fabric. This aspect provides greater abrasion resistance and improved durability than conventional nonwoven fabric sheets.

[0009] In a preferred aspect of the present invention, the fabric and the waterproof layer are tarpaulin. According to this aspect, the sheet is made of tarpaulin, which makes it more resistant to friction than conventional nonwoven fabric sheets and improves durability.

[0010] The structure of the sheet that defines the pockets is not particularly limited. In one aspect of the present invention, the sheet includes a sheet row that defines multiple pockets in the longitudinal or lateral direction of the mattress, and the sheet row includes strip-shaped sheets that extend in the extending direction. The strip sheets are folded back at the center in the width direction of the strip sheets, and one region in the width direction and the other region in the width direction face each other, and both edges in the width direction are joined to each other, in order to define multiple pockets arranged in parallel in the extension direction of the sheet row. Furthermore, the one region in the width direction and the other region in the width direction of the strip sheets are joined at equal intervals in the extension direction of the strip sheets in accordance with the pocket width dimension of the pocket. According to this aspect, pockets into which coil springs are individually enclosed can be efficiently created. In another aspect of the present invention, the strip sheet is folded back at a location included in one side of the strip width direction and a location included in the other side of the strip width direction, and both edges in the strip width direction are joined to each other, with the joined both edges of the strip sheet being included in one side of the pocket and the center of the strip sheet in the strip width direction being included in the other side of the pocket.

[0011] In one aspect of the present invention, a large number of sheet rows are arranged in parallel in the front-to-rear direction of the mattress, and the band-shaped sheets on one side of the front-to-rear direction and the band-shaped sheets on the other side of the front-to-rear direction are joined to each other by heat welding or adhesive at pocket bulges. This aspect makes it easier to bend the mattress in the front-to-rear direction. Therefore, the mattress can be elastically deformed into a shape that is easy to use, such as by tilting the front half of the mattress while keeping the rear half horizontal. In a preferred aspect of the present invention, the sheet includes a sheet row that defines multiple pockets in one of the front-to-rear and left-to-right directions of the mattress as an extension direction and the other as a width direction, and the sheet portions between adjacent pockets in the sheet row are staggered on one side or the other of the width direction of the sheet row, and two adjacent sheet rows are joined at sheet portions that approach each other in the row width direction. This aspect allows a larger area of ​​the sheet portions to be secured compared to when the pockets are joined to each other by pocket bulges, thereby enabling the sheet rows to be firmly joined to each other. [Effects of the Invention]

[0012] Thus, according to the present invention, a mattress having durability against liquids can be provided. Furthermore, even if liquid is accidentally spilled on the mattress of the present invention, the liquid can be removed by wiping it off, making cleaning easy. The present invention is useful in nursing care settings, such as nursing beds, because unintentional spills of liquids often occur in nursing care settings. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a plan view showing a mattress according to one embodiment of the present invention. [Figure 2] FIG. 1A is a side view showing the embodiment, and FIGS. 1B and 1C are cross-sectional views. [Figure 3] FIG. 2 is a bottom view showing one row of coil springs and a seat taken out from the embodiment. [Figure 4] FIG. 10 is a perspective view schematically showing a state in which rows of coil springs are joined together. [Figure 5] FIG. 10 is a plan view showing a mattress according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan view of a mattress according to one embodiment of the present invention, viewed from above. FIG. 2 is a side view and a cross-sectional view showing a sheet row from the same embodiment, where (A) is a side view, (B) is a cross-sectional view of the sheet row cut at line BB in (A) and viewed in the direction of the arrow, and (C) is a cross-sectional view of the sheet row cut at line CC in (A) and viewed in the direction of the arrow, and (B) and (C) are views viewed in the left-right or front-back direction. A mattress 10 according to this embodiment includes multiple coil springs 11 and a cloth-like or membrane-like sheet 21 that houses each coil spring. The coil springs 11 are elastic bodies made of wire formed into a spiral shape, and their longitudinal direction is the thickness direction of the mattress, i.e., the vertical direction, and they expand and contract in the same direction. As shown in FIG. 1, when viewed in the vertical direction, the multiple coil springs 11, 11... are arranged in a row. The mattress 10 has not one row of coil springs 11, 11 . . . but multiple rows.

[0015] The coil spring 11 of this embodiment is formed into a spiral shape from a steel wire rod having a diameter within the range of φ0.8 to φ1.3 mm or 1.3 to 1.9 mm, for example, selected from φ1.3, φ1.6, φ1.8, and φ1.9. The outer diameter of the coil spring 11 itself is within the range of φ30 to φ80 mm. The number of turns of each coil spring 11 is, for example, within the range of 5 to 20, preferably 10 to 15. The number of turns of the coil spring 11 of this embodiment is 11. The greater the number of turns, the more elongated and slender the coil spring 11 can be formed in the vertical direction.

[0016] As shown in Figure 1, in this embodiment, a plurality of coil springs 11, 11... are wrapped in a strip-shaped sheet 21 extending in the left-right direction (MN) of the mattress 10 and are grouped together in a row. This is called a sheet row 22. A large number of sheet rows 22 are arranged in the front-to-back direction (FR) of the mattress 10. Here, the front refers to the head side of a user lying on the top surface of the mattress 10, and the rear refers to the foot side of the user.

[0017] A through opening 23 is defined between adjacent seat rows 22, 22. The through opening 23 is formed between adjacent coil springs 11, 11. In this embodiment, the through opening 23 is formed by two coil springs 11, 11 adjacent in the left-right direction and two coil springs 11, 11 adjacent in the front-rear direction, for a total of four coil springs 11 (pockets 24). The through openings 23 extend in the vertical direction like the coil springs 11, and penetrate the mattress 10 in the thickness direction. The through openings 23 allow each coil spring 11 to expand and contract with a high degree of freedom. Furthermore, the large number of through openings 23 ensures breathability on the upper surface of the mattress 10.

[0018] As shown in FIG. 2(A), the sheet row 22 has a number of pockets 24, 24... arranged in parallel in the direction of its extension. Each pocket 24 houses one coil spring 11. The pockets 24 are air-filled chambers. Each coil spring 11 constantly repels both ends of the pocket 24 due to its own repulsive force. When nothing is placed on the mattress 10, the coil spring 11 has a fixed length, as shown in FIGS. 2(A) and 2(B). This length, i.e., the vertical thickness of the mattress 10, is within a range of 60 mm to 200 mm, for example. In this embodiment, the vertical thickness of the mattress 10 is 140 mm, the number of turns of the coil spring 11 is 12, and the outer diameter of the coil spring 11 is φ30. In this embodiment, the ratio of the outer diameter to the longitudinal dimension of the coil spring 11 is within a range of 1:2 to 1:6, specifically 1:4 to 1:5, when the mattress 20 is not in use.

[0019] The sheets 21 of the sheet row 22 are fabrics woven with synthetic fiber yarns. Woven fabrics are more durable and abrasion-resistant than nonwoven fabrics. The sheets 21 of this embodiment are woven with polyester warp and weft yarns. The weaving pattern of the fabric is not particularly limited.

[0020] A waterproof layer in the form of a coating is provided on the outer and / or inner surfaces of the fabric sheet 21. The waterproof layer is, for example, a resin that coats the surface of the polyester fabric. An example of the resin for the waterproof layer is polyvinyl chloride resin. Such polyvinyl chloride resin may contain additives such as plasticizers and stabilizers. An example of the material for such sheet 21 is tarpaulin. Tarpaulin is a woven fabric in which a water-impermeable synthetic resin layer is formed on both sides (or one side) of a polyester fiber fabric, and it is flexible and has a soft texture. It also has excellent watertightness, preventing liquids such as water from entering pocket 24 from outside mattress 10.

[0021] The sheet row 22 of this embodiment is composed of a strip-shaped sheet 21 extending elongately in one direction. As shown in the cross-sectional views of Figures 2(B) and (C), the strip-shaped sheet 21 is folded back at a fold line at a center 28 in the strip width direction, so that one strip width direction region 22b and the other strip width direction region 22c face each other. One strip width direction edge 22d extending from one side and the other strip width direction edge 22f extending from the other side overlap while extending in the opposite direction and are joined by welding. Multiple such joints 29 are provided intermittently along the extension direction of the sheet row 22. At the joints 29, the synthetic fiber fabric core of the one strip width direction edge 22d penetrates the waterproof layer on the surface of the sheet 21 and is thermally welded to the synthetic fiber fabric core of the other strip width direction edge 22f.

[0022] In this embodiment, the widthwise center 28 can be the upper surface of the mattress 10, and the series of joint points 29, 29... can be the lower surface of the mattress 10. Alternatively, the mattress 10 can be turned upside down. In either case, the mattress 10 can be used with the upper surface exposed to the outside, in other words, without the need to lay any additional fabric or cloth on the upper surface.

[0023] In this embodiment, the series of joint points 29 are arranged at the longitudinal ends of the coil spring 11. Alternatively, as a modified example of this embodiment, the series of joint points 29 may be arranged along line D-D shown in FIG. 2(A) or at region D shown in FIGS. 2(B) and 2(C). In such a modified example, the joint points 29 are arranged on the sides of the coil spring 11. In such a modified example, the joint points 29 may be arranged in the longitudinal center of the coil spring 11, or, although not shown, may be arranged in one longitudinal region between the longitudinal center and the longitudinal end of the coil spring 11. With a configuration in which the series of joint points 29 are arranged in region D, the strip-shaped sheet 21 is folded back at a location included in one strip width direction and a location included in the other strip width direction, and the two strip width direction edges that are joined to each other become region D. Region D is included in one side of the pocket 24, and the strip width direction center of the strip-shaped sheet is included in the other side of the pocket 24 (FIG. 2(B)).

[0024] 3 is a bottom view showing one row of coil springs and seats from the same embodiment, representing one seat row 22. The joint points 29 are arranged in two rows 29e and 29g, aligned in the extension direction of the seat row 22. Alternatively, as a variation not shown, the joint points 29 may be in one row, or in three or more rows. The more rows there are, the more improved the watertightness and airtightness of the pocket 24.

[0025] As shown in FIG. 3, the first row of joining points 29e and the second row of joining points 29g are aligned with each other. Alternatively, as a modified example not shown, the joining points 29e and 29g may be aligned in a staggered manner. This staggered alignment improves the watertightness and airtightness of the pocket 24. Alternatively, as a modified example not shown, the joining points 29e, 29g, 29e, 29g, 29e, 29g, etc. may be aligned in this order. This continuous alignment ensures that the thermally welded lines are continuous without interruption in the extension direction, completely sealing off the gap between the one edge 22d in the strip width direction and the other edge 22f in the strip width direction.

[0026] Returning to FIG. 2 for explanation, referring to FIG. 2(C), the facing one region 22b in the strip width direction and the other region 22c in the strip width direction of the strip-shaped sheet 21 are joined by thermal welding such as ultrasonic welding. These joining points 25 extend vertically in a dot pattern. A series of joining points 25, 25... are provided between adjacent pockets 24, 24; in other words, they are spaced apart at intervals of approximately semicircular length of the coil spring 11 to define each pocket 24. Note that the series of joining points 25 is not provided at the upper edge (near the center 28 in the strip width direction) or the lower edge (near the joining point 29) of the sheet row 22. As a result, the upper and lower ends of adjacent pockets 24, 24 are connected by communication passages 26, 27, allowing air to circulate.

[0027] Focusing on the upper surface of the mattress 10, a circular plane 22h is stretched between adjacent communication passages 26, 26 as the upper ends of the coil springs 11 elastically contact the sheet 21. The circular plane 22h has a diameter corresponding to the outer diameter of the coil springs 11. The communication passages 26 are made of fabric and are smaller than the circular plane 22h. Therefore, the communication passages 26 do not impair the comfort of a user lying directly on the upper surface of the mattress 10.

[0028] Similarly, focusing on the underside of the mattress 10, the lower ends of the coil springs 11 elastically contact the sheet 21 between adjacent communication passages 27, 27, thereby stretching a circular plane 22j having the same shape and dimensions as the circular plane 22h.

[0029] In addition, with regard to the numerous pockets 24 included in one seat row 22, all of the pockets 24, 24, ... from the pocket 24 at one end of the seat row 22 to the pocket 24 at the other end are connected by the communication passages 26 and / or the communication passages 27. As a result, air in the pockets 24 flows between the multiple pockets 24 in response to the expansion and contraction of the coil springs 11, and the vertical dimensions of the pockets 24 change. In a modified example not shown, the seat row 22 has either the communication passage 26 or the communication passage 27.

[0030] 4 is a perspective view showing a schematic view of the joining of sheet rows 22, 22. A large number of sheets 22 making up one row of pockets 24, 24 are produced for each sheet row 22. The sheet rows 22, 22 are joined to each other at joining surfaces 31 by thermal welding such as ultrasonic welding, or by adhesive such as a hot melt material or other material. Here, the joining surface 31 is located in the center of the pocket 24 in the width direction, and extends in the longitudinal direction (i.e., the up-and-down direction) of the pocket 24.

[0031] As a result, the numerous sheet rows 22, 22... are arranged in parallel and joined together as shown in FIG. 1 to form the mattress 10. According to the coil spring 11 of this embodiment, the number of turns is in the range of 10 to 15, which ensures a sufficient vertical dimension of the joint surface 31. This prevents the mattress 10 from accidentally breaking or splitting. The greater the number of turns, the more elongated the coil spring 11 can be made in the vertical direction, resulting in a longer joint surface 31 and stronger joints between the sheet rows 22. Referring to FIG. 4, the upper end of the joint surface 31 is preferably located at a height approximately half a turn below the upper end of the coil spring 11. The lower end of the joint surface 31 is also preferably located at a height approximately half a turn above the lower end of the coil spring 11. To ensure sufficient joint strength, the joint surface 31 is preferably continuous from the upper end to the lower end, but may be discontinuous.

[0032] Like a typical mattress, the mattress 10 of this embodiment is used when laid on a horizontal surface. However, the mattress 10 of this embodiment is also compatible with an electric bed in which the upper body tilts. Specifically, for example, approximately half of the mattress 10 in the front-to-back direction remains horizontal, while the remaining half can be tilted, curved, or otherwise freely deformed. In FIG. 1 , multiple sheet rows 22, 22... are arranged in parallel in the F-R direction (the front-to-back direction of the mattress 10), which is the left-to-right direction of the page, and are joined in the same direction, with the coil springs 11, 11 being close to each other in the F-R (front-to-back) direction. In contrast, focusing on the direction perpendicular to the F-R (front-to-back) direction, adjacent coil springs 11, 11 are spaced apart in the M-N direction (the left-to-right direction of the mattress 10), which is the up-to-down direction of the page. The mattress 10 is therefore more easily bent in the F-R (front-to-back) direction than in the M-N (left-to-right) direction, making it easier to deform to follow the shape of a bed, such as an electric bed, in which the front and rear height positions change relative to each other.

[0033] The mattress 10 of this embodiment includes a number of coil springs 11 arranged in parallel in the front-to-back and left-to-right directions and capable of expanding and contracting with the vertical direction (i.e., the thickness direction of the mattress) as the longitudinal direction. The flexible sheet 21 defines vertically elongated pockets 24 into which each of the coil springs 11 is enclosed. The sheet 21 includes a fabric woven with synthetic fiber yarn, such as tarpaulin, and a waterproof layer covering the surface of the fabric. Alternatively, the sheet 21 may be a soft vinyl chloride sheet. According to this embodiment, the sheet 21 provides a waterproof barrier against liquids such as water, preventing liquid from penetrating the pockets 24 and improving the stain resistance of the mattress. Therefore, even if a user of the mattress 10 accidentally spills a large amount of liquid on its surface, cleaning the mattress 10 is easy. Furthermore, liquids do not soak into the sheet 21, preventing rust or corrosion of the coil springs 11 in the pockets 24. Furthermore, woven fabrics are more resistant to friction than nonwoven fabrics, improving the durability of the mattress.

[0034] Furthermore, since the sheet 21 of this embodiment contains polyester woven fabric, it is resistant to friction and tension, and therefore the durability of the mattress 10 is improved compared to conventional mattresses in which the sheet 21 is made of nonwoven fabric.

[0035] Furthermore, in this embodiment, a large number of sheet rows 22 are prepared and arranged in parallel in the front-to-rear direction of the mattress 10 as shown in Figure 1 (or in the left-to-right direction of the mattress 10 as a modified example not shown). Then, as shown schematically in Figure 4, the sheet row 22 on one side in the front-to-rear direction and the sheet row 22 on the other side in the front-to-rear direction are joined together by joining surfaces 31 at the pocket bulge portions of the pockets 24. This makes it possible to manufacture a mattress 10 that is larger than the human body.

[0036] Furthermore, according to this embodiment, as shown in Fig. 2, no selvage (excess of sheet 21) is created at joining point 29, so the ends of sheet row 22 in the obi width direction can be neatly gathered. Alternatively, as a modified example not shown, one edge 22d in the obi width direction and the other edge 22f in the obi width direction of sheet row 22 may overlap while extending in the same direction and be joined by welding. In this case, joining point 29 becomes a selvage of sheet 21 and protrudes from the end of sheet row 22 in the obi width direction.

[0037] Next, another embodiment of the present invention will be described. Figure 5 is a plan view showing a mattress according to another embodiment of the present invention, in which the longitudinal direction of the coil springs (thickness of the mattress) is shown in perspective, and it should be understood that the multiple coil springs are arranged in parallel. In this embodiment, components common to the above-described embodiment are given the same reference numerals and will not be described again, and only different components will be described below. In mattress 20 according to this embodiment, mattress 20 is folded in a zigzag pattern with respect to the row width direction of seat row 22 (F-R in Figure 5) so that joints 25, 25... alternate in the row width direction, but pockets 24 and coil springs 11 are aligned in a straight line in the extension direction of seat row 22 (M-N in Figure 5).

[0038] When considering the extension direction (MN) and row width direction (F-R) of the seat row 22, the seat points 34 between adjacent pockets 24, 24 in the extension direction are arranged on one side of the row width direction. Furthermore, the seat points 34 between adjacent pockets 24, 24 in the extension direction are arranged on the other side of the row width direction. The numerous seat points 34, 34, ... arranged in the extension direction of the seat row 22 are arranged alternately in the row width direction. The seat points 34 include joint points 25.

[0039] Focusing on two adjacent sheet rows 22, 22, the sheet locations 34 of one sheet row 22 and the sheet locations 34 of the other sheet row 22 are close to each other. Alternatively, the sheet locations 34 of one sheet row 22 and the sheet locations 34 of the other sheet row 22 are spaced apart from each other. For the sheet locations 34, 34 that are close to each other, the side of one sheet location 34 and the side of the other sheet location 34 are joined by ultrasonic bonding, a hot melt material, or the like.

[0040] According to the mattress 20 shown in FIG. 5, a larger area can be secured for the seat portion 34 compared to the joint surface 31 (FIG. 4), and therefore the seat rows 22, 22 can be firmly joined together.

[0041] Coil springs 11 are compressed in pockets 24. Alternatively, as a modified example not shown, some of the many pockets 24, 24, 24, ... may have nothing placed in them, and these pockets 24 may be collapsed when the mattress 20 is not in use. Air pushed out from the other pockets 24 when the mattress 20 is in use is stored in these collapsed pockets 24. In this way, pockets 24 without coil springs 11 temporarily store air, and therefore serve as temporary absorption bags.

[0042] The pockets 24 serving as temporary absorption bags are provided at a fixed rate among all the pockets 24, 24, etc., and more specifically, for example, they are provided at predetermined intervals, such as every other pocket or every few pockets, among the plurality of pockets 24, 24, etc. arranged in the seat row 22. By providing the mattress 20 with pockets 24 serving as temporary absorption bags, the elastic expansion and contraction of the coil springs 11 is not inhibited, allowing for a high degree of freedom of expansion and contraction in the thickness direction, improving sleeping comfort.

[0043] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope. For example, some components may be extracted from one embodiment described above, and other components may be extracted from another embodiment described above, and these extracted components may be combined.

[0044] The mattress of this embodiment may have smaller front-to-back and left-to-right dimensions than those shown in the drawings, and may be about the same size as a cushion supporting the buttocks of a human body for ease of portability. The mattress of this embodiment may also be used as a cushioning material to support precision equipment or luggage, in addition to supporting a human body in a recumbent position. To express the softness of seat 21, seat 21 is depicted slightly distorted in Figures 2 and 3, but in reality, seat 21 is maintained in a taut state with almost no distortion due to the repulsive force of coil spring 11. [Industrial Applicability]

[0045] The present invention is advantageously used in everyday products. [Explanation of symbols]

[0046] 10 mattress, 11 coil spring, 21 (strip) sheet, 22 Seat row, 24 Pocket (temporary absorption bag), 25 Joint, 26,27 communication path, 29 joint point, 31 joint surface, 34 Seat location (joint between seat rows).

Claims

1. a number of coil springs that are expandable and contractible with the vertical direction as the longitudinal direction and that are arranged in parallel in the front-rear and left-right directions; a flexible sheet that defines vertically elongated pockets into which the coil springs are individually enclosed, The mattress sheet includes a fabric woven from synthetic fiber yarn and a waterproof layer covering the surface of the fabric, or is a soft vinyl chloride sheet.

2. 10. The mattress of claim 1, wherein the fabric is a woven polyester fabric.

3. The mattress of claim 1 , wherein the fabric and the waterproof layer are tarpaulins.

4. The seat includes a row of seats that defines a large number of the pockets in the longitudinal direction or the left-right direction as an extension direction, The sheet row includes a strip-shaped sheet extending in the extension direction, The belt-shaped sheet is provided with a plurality of pockets arranged in parallel in the extending direction, The belt is folded back at the center in the belt width direction, and the belt width direction one region and the belt width direction other region face each other, and both edges in the belt width direction are joined to each other, The mattress according to claim 1 , wherein the one region in the belt width direction and the other region in the belt width direction are joined at equal intervals in the extension direction in accordance with a pocket width dimension of the pocket.

5. The seat includes a seat row that defines one of the front-rear direction and the left-right direction as an extension direction and the other as a row width direction, and defines a large number of the pockets in the extension direction, The sheet portions between adjacent pockets in the sheet row are arranged alternately on one side or the other side of the row width direction, The mattress according to claim 1 , wherein two adjacent sheet rows are joined at sheet locations that approach each other in the row width direction.

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