Cover body and mattress

Abstract

Provided is a cover body whereby deviation from tossing and turning in bed can be suppressed without impairing the attachment / detachment properties of an upper cover and a lower cover. The cover body comprises: an upper cover for covering the upper surface of an inner material of a mattress; and a lower cover for covering the lower surface of the inner material. The lower cover comprises: a corner member in which a lower arrangement part arranged below the inner material and a side arrangement part arranged next to the inner material are connected; and a lower engagement member fixed to the side arrangement part. The upper cover includes an upper engagement member that engages with the lower engagement member.

Description

Cover body and mattress

[0001] The present invention relates to a cover body and a mattress using the same.

[0002] Conventionally, a cover body has been known in which an upper cover that covers the upper surface of the inner material and a lower cover that covers the lower surface of the inner material can be connected and separated with a fastener to enable insertion and removal of the inner material into and from the mattress cover. For example, Patent Document 1 discloses that a mattress is formed by placing the contents of the mattress in a dedicated cover and fastening it with a fastener.

[0003] Patent No. 7045336

[0004] However, when attaching and detaching (connecting and separating) the upper and lower covers, it is necessary to operate the fasteners provided around the entire side, which is time-consuming. To avoid this, it is possible to use a cover body with a bottom opening, but this poses the problem that the cover body is prone to shifting when the user turns over in bed.

[0005] In view of the above problems, the present invention aims to provide a cover body that can prevent the upper cover and the lower cover from shifting when turning over in bed, without impairing the ease of attachment and detachment of the upper cover and the lower cover.

[0006] The cover body of the present invention comprises an upper cover that covers the upper surface of the mattress filling and a lower cover that covers the underside of the filling, wherein the lower cover has corner members that connect a lower portion positioned below the filling and a side portion positioned to the side of the filling, and a lower engaging member fixed to the side portion, and the upper cover has an upper engaging member that engages with the lower engaging member. This configuration makes it possible to prevent the upper and lower covers from shifting when turning over in sleep without impairing the ease of attachment and detachment of the upper and lower covers.

[0007] More specifically, the above configuration may be such that the lower cover comprises, as the corner members, a first corner member arranged at one end in the width direction and a second corner member arranged at the other end in the width direction, and the lower engaging members comprise, as the first lower engaging member fixed to the lateral positioning portion of the first corner member and a second lower engaging member fixed to the lateral positioning portion of the second corner member, and the upper cover comprises, as the upper engaging members, a first upper engaging member that engages with the first lower engaging member and a second upper engaging member that engages with the second lower engaging member.

[0008] More specifically, the first corner member and the second corner member may be integrally formed so that their lower portions are connected to each other. Also, more specifically, the first corner member and the second corner member may be connected to each other at their lower portions using an anti-stretch member that is less stretchable than the fabric of the main body of the lower cover.

[0009] More specifically, the side portions may be configured to be foldable relative to the lower portion. The mattress according to the present invention is configured to include the cover body configured as described above and a filling material accommodated in the cover body.

[0010] The cover body according to the present invention makes it possible to prevent the upper cover and the lower cover from shifting when the user turns over in bed without impairing the ease of attachment and detachment of the upper cover and the lower cover.

[0011] FIG. 1 is a side view of a mattress according to a first embodiment of the present invention. FIG. 2 is an exploded side view of a mattress according to the first embodiment of the present invention. FIG. 3 is a perspective view of an upper cover. FIG. 4 is a cross-sectional view of the upper cover taken along line A-A'. FIG. 5 is a bottom view of the upper cover. FIG. 6 is a perspective view of a lower cover. FIG. 7 is a cross-sectional view of the lower cover taken along line B-B'. FIG. 8 is a top view of the lower cover. FIG. 9 is a perspective view of a corner member. FIG. 10 is a side view of a corner member. FIG. 11 is a perspective view of a lower cover according to a second embodiment of the present invention. FIG. 12 is a perspective view of a corner member. FIG. 13 is a perspective view of a corner member according to a third embodiment of the present invention. FIG. 14 shows a side view of a mattress according to a fourth embodiment of the present invention in the middle of assembly and a side view of the completed mattress.

[0012]

[0023] In the following description, the front-to-back, left-to-right, and up-to-down directions (orthogonal directions) of the mattress are as shown in Figure 1 and other figures.

[0013] 1. First Embodiment Fig. 1 is a side view of a mattress 1 according to a first embodiment of the present invention. Fig. 2 is an exploded side view of the mattress 1.

[0014] Mattress 1 includes a core 2 and a cover body 5 that houses core 2. Overall, mattress 1 has a rectangular parallelepiped shape with sides in the front-to-back direction (length), left-to-right direction (width), and up-to-down direction (thickness), with the left-to-right dimension being slightly smaller than the front-to-back dimension, and the up-to-down dimension being significantly smaller than the left-to-right dimension. Mattress 1 is suitable as a bed mattress to be placed on a bed, but can also be placed on the floor or the like.

[0015] The inner material 2 is formed so that it can be separated lengthwise into three cushion bodies 21 to 23. The mattress 1 is usually placed on a horizontal bed or floor, with the user lying on top. When used in this manner, the up-down direction of the mattress 1 coincides with the vertical direction. As described above, the mattress 1 is set to be longer in the front-to-back direction (length direction), and can be suitably used in a form in which the front-to-back direction roughly coincides with the user's height.

[0016] The three cushion bodies 21 to 23 all have the same configuration, and can be, for example, three-dimensional filament combinations. The three-dimensional filament combinations may be provided with a mesh-like inner cover that covers the entire outer surface. Each of the cushion bodies 21 to 23 is approximately rectangular.

[0017] A three-dimensional bound filament is an elastic member obtained by three-dimensionally fusing and bonding molten filaments of a thermoplastic resin. In the manufacturing process, molten thermoplastic resin is extruded vertically downward from multiple horizontally arranged nozzles. Molten filaments with a cross-sectional diameter of approximately 1 mm are then dropped into cooling water, where the buoyancy of the water causes loops to form. At the same time, the looped molten filaments are three-dimensionally fusing and bonded to each other, resulting in the three-dimensional bound filament. By controlling the width of the molten filaments using a chute and a take-up machine, a smooth surface layer with a higher filament density at both ends in the thickness direction than at the center in the thickness direction can be formed. For example, a method disclosed in Japanese Patent No. 4,966,438 can be used to manufacture such a three-dimensional bound filament.

[0018] The cover body 5 comprises an upper cover 3 that covers the upper surface 2A of the inner material 2, and a lower cover 4 that covers the lower surface 2B of the inner material 2. The upper cover 3 and the lower cover 4 can be joined together by engaging an upper engaging member 33 and a lower engaging member 43 (described later) with the inner material 2 housed inside. In this embodiment, the upper cover 3 and the lower cover 4 are completely separate before being joined, but parts of them (for example, the edges of one front and one back end) may be connected to each other.

[0019] Here, the upper cover 3 will be described in detail. Fig. 3 is a perspective view of the upper cover 3. Fig. 4 is a cross-sectional view of the upper cover 3 taken along line AA'. Fig. 5 is a bottom view of the upper cover 3.

[0020] The upper cover 3 includes an upper cover main body 31 formed from a single piece of fabric, an anti-stretch member 32, and an upper engagement member 33. The upper cover main body 31 includes a rectangular upper surface portion 31A that contacts the user from above, a rectangular front surface portion 31B extending downward from the front end of the upper surface portion 31A, a rectangular rear surface portion 31C extending downward from the rear end of the upper surface portion 31A, a first upper side surface portion 31D extending downward from the left end of the upper surface portion 31A, and a second upper side surface portion 31E extending downward from the right end of the upper surface portion 31A. The space surrounded by the upper surface portion 31A, the front surface portion 31B, the rear surface portion 31C, the first upper side surface portion 31D, and the second upper side surface portion 31E is exposed downward. That is, the upper cover main body 31 includes an opening 30 that opens downward.

[0021] More specifically, the top surface portion 31A is bounded by a left edge 3a and a right edge 3b extending from front to back, and a front edge 3c and a rear edge 3d extending from left to right. The front surface portion 31B is bounded by a left edge 3e and a right edge 3f extending from top to bottom, and an upper edge 3c and a lower edge 3m extending from left to right. The rear surface portion 31C is bounded by a left edge 3g and a right edge 3h extending from top to bottom, and an upper edge 3d and a lower edge 3n extending from left to right.

[0022] The first upper side surface portion 31D is surrounded by sides 3a, 3e, and 3g, a side 3i extending from the lower end of side 3e at an incline downward as it extends rearward, and a side 3j extending from the lower end of side 3g at an incline downward as it extends forward. The second upper side surface portion 31E is surrounded by sides 3b, 3f, and 3h, a side 3k extending from the lower end of side 3f at an incline downward as it extends rearward, and a side 3l extending from the lower end of side 3h at an incline downward as it extends forward.

[0023] Stretch-preventing members 32 are provided along edges 3m, 3i, 3j, 3n, 3l, and 3k. That is, the stretch-preventing members 32 are arranged along the periphery of the opening 30. The stretch-preventing members 32 are configured to be less stretchable than the upper cover body 31, and function to prevent the upper cover body 31 from stretching in the lengthwise (body height) and widthwise directions. The stretch-preventing members 32 are preferably made of a material (such as string or fabric) that stretches 5 cm or less per meter when pulled with a force of 10 N, and more preferably, a material (such as string or fabric) that stretches 1 cm or less per meter when pulled with a force of 10 N. The provision of the stretch-preventing members 32 suppresses unnecessary stretching of the periphery of the opening 30 and prevents the upper cover body 31 from shifting from the upper surface 2A of the filling 2. The stretch-preventing members 32 may also be fixed to the upper engaging members 33 on one or both of the left and right sides. This more effectively prevents the upper cover body 31 from shifting.

[0024] The upper cover 3 has upper engaging members 33, a first upper engaging member 331 on the left and a second upper engaging member 33 on the right. The first upper engaging member 331 is fixed to the inner surface of the first upper side surface portion 31D at the location where sides 3i and 3j are connected (i.e., the center portion in the longitudinal direction of the upper cover main body 31). The second upper engaging member 332 is fixed to the inner surface of the second upper side surface portion 31E at the location where sides 3k and 3l are connected (i.e., the center portion in the longitudinal direction of the upper cover main body 31).

[0025] Next, the lower cover 4 will be described in detail. Fig. 6 is a perspective view of the lower cover 4. Fig. 7 is a cross-sectional view of the lower cover 4 taken along line BB'. Fig. 8 is a top view of the lower cover 4.

[0026] The lower cover 4 includes a lower cover main body 41 formed from a single piece of fabric, an extension prevention member 42, a lower engagement member 43, and corner members 44. The lower cover main body 41 includes a rectangular lower surface portion 41A that contacts the installation surface on which the mattress 1 is placed, a rectangular front surface portion 41B extending upward from the front end of the lower surface portion 41A, a rectangular rear surface portion 41C extending upward from the rear end of the lower surface portion 41A, a first lower side surface portion 41D extending upward from the left end of the lower surface portion 41A, a second lower side surface portion 41E extending upward from the right end of the lower surface portion 41A, a front upper surface portion 41F extending rearward from the upper end of the front surface portion 41B, and a rear upper surface portion 41G extending forward from the upper end of the rear surface portion 41C. An upwardly opening 40 is provided longitudinally between the front upper surface portion 41F and the rear upper surface portion 41G.

[0027] More specifically, the lower surface portion 41A is bounded by a left edge 4a and a right edge 4b ​​extending from front to back, and a front edge 4c and a rear edge 4d extending from left to right. The front surface portion 41B is bounded by a left edge 4e and a right edge 4f extending from top to bottom, and a bottom edge 4c and a top edge 4i extending from left to right. The rear surface portion 41C is bounded by a left edge 4g and a right edge 4h extending from top to bottom, and a bottom edge 4d and a top edge 4m extending from left to right.

[0028] The first lower side portion 41D is surrounded by side 4a, sides 4e and 4g, side 4k extending rearward from the upper end of side 4e, side 4o extending forward from the upper end of side 4g, side 4q sloping downward as it extends rearward from the rear end of side 4k, side 4r sloping downward as it extends forward from the front end of side 4o, and side 4u connecting sides 4q and 4r in the front-to-rear direction.

[0029] The second lower side portion 41E is surrounded by side 4b, sides 4f and 4h, side 4l extending rearward from the upper end of side 4f, side 4p extending forward from the upper end of side 4h, side 4s sloping downward as it extends rearward from the rear end of side 4l, side 4t sloping downward as it extends forward from the front end of side 4p, and side 4v connecting sides 4s and 4t in the front-to-rear direction.

[0030] The front upper surface portion 41F is surrounded by sides 4j, 4k, and 4l, and a side 4j extending to the left and right. The rear upper surface portion 41G is surrounded by sides 4m, 4o, and 4p, and a side 4n extending to the left and right.

[0031] The stretch-preventing members 42 are provided along the edges 4i, 4q, 4u, 4r, 4n, 4t, 4v, and 4s. That is, the stretch-preventing members 42 are provided along the periphery of the opening 40. The stretch-preventing members 42 are configured to be less stretchable than the lower cover body 41 and function to prevent the lower cover body 41 from stretching in the length and width directions. Similar to the stretch-preventing member 32 described above, the stretch-preventing members 42 are preferably made of a material (such as string or fabric) that stretches 5 cm or less per meter when pulled with a force of 10 N. The provision of the stretch-preventing members 42 suppresses unnecessary stretching of the periphery of the opening 40 and prevents deterioration of the lower cover body 41. The stretch-preventing members 42 may also be fixed to the corner members 44 on one or both of the left and right sides.

[0032] Next, the corner member 44 will be described. FIG. 9 shows a perspective view of the corner member 44. FIG. 10 shows a side view of the corner member 44. The corner member 44 is an L-shaped member when viewed from the front to back and includes a first piece 44A (lower portion) and a second piece 44B (lateral portion). The first piece 44A is a thin, rectangular flat plate with its thickness extending vertically, while the second piece 44B is a thin, rectangular flat plate with its thickness extending horizontally. The corner member 44 is configured in this manner to minimize the degradation of the mattress 1's usability and appearance. The first piece 44A and the second piece 44B are joined at their edges, forming a 90-degree angle. The corner member 44 is made of, for example, silicone resin, rubber, elastomer, plastic, or thick fabric, and is less stretchy than the fabric of the upper cover body 31 and the lower cover body 41.

[0033] The lower cover 4 includes corner members 44: a first corner member 441 on the left and a second corner member 442 on the right. The first corner member 441 is provided at the location of side 4u (i.e., the center portion in the longitudinal direction of the lower cover main body 41). A first piece 441A of the first corner member 441 is fixed to the outer surface of the lower surface portion 41A, and a second piece 441B of the first corner member 441 is fixed to the outer surface of the first lower side surface portion 41D.

[0034] The second corner member 442 is provided at the location of side 4v (i.e., the longitudinal center portion of the lower cover body 41). A first piece 442A of the second corner member 442 is fixed to the outer surface of the lower surface portion 41A, and a second piece 442B of the second corner member 442 is fixed to the outer surface of the second lower side surface portion 41E.

[0035] The first lower engaging member 431 serving as the lower engaging member 43 is fixed to the outer surface of the second piece 441B. The second lower engaging member 432 serving as the lower engaging member 43 is fixed to the outer surface of the second piece 442B.

[0036] The upper engaging member 33 and the lower engaging member 43 are made of, for example, a hook and loop fastener, a buckle, a round button and buttonhole, a hook and hook hole, or a high-friction fabric (such as the fabric related to the invention of Patent No. 7270396 or a microfiber fabric).

[0037] When assembling the mattress 1, the inner material 2 (cushions 21-23) is first inserted into the lower cover body 41 through the opening 40, and the inner material 2 is housed in the lower cover 4. Next, the upper cover 3 is placed over the lower cover 4 from above. When placed over the mattress 1, the front surface 31B of the upper cover body 31 is positioned in front of the front surface 41B of the lower cover body 41, the rear surface 31C is positioned behind the rear surface 41C, the first upper side surface 31D is positioned to the left of the first lower side surface 41D, and the second upper side surface 31E is positioned to the right of the second lower side surface 41E. The upper surface 31A of the upper cover body 31 is positioned above the front upper surface 41F and rear upper surface 41G of the lower cover body 41 and the top surface of the inner material 2.

[0038] The first upper engaging member 331 is engaged with the first lower engaging member 431, and the second upper engaging member 332 is engaged with the second lower engaging member 432. This connects the upper cover 3 and the lower cover 4, completing the mattress 1. When removing the inner material 2 from the mattress 1, the engagement can be released and the upper cover 3 can be removed. In this manner, in this embodiment, when connecting or separating the upper cover 3 and the lower cover 4, no work such as operating the fasteners provided around the entire side surface is required, and the upper cover 3 and the lower cover 4 can be easily attached and detached.

[0039] Furthermore, with the mattress 1 configured as described above, when a user lies on the upper surface of the mattress 1, i.e., on the upper surface portion 31A of the upper cover body 31, the weight of the user and the inner material 2 can be utilized to firmly secure the first pieces 441A, 442A of the corner members 44 at the lower position of the mattress 1, effectively preventing misalignment. The lower engaging members 43 are fixed to the second pieces 441B, 442B connected to the first pieces 441A, 442A, and engage with the upper engaging members 33. This effectively prevents the upper cover body 31 from shifting in the width direction when the user turns over. In particular, because the sets of the corner members 44, lower engaging members 43, and upper engaging members 33 are provided at both the left and right ends, misalignment of the upper cover body 31 can be prevented regardless of whether the user turns over to the left or right.

[0040] In addition, the first piece 44A of the corner member 44 may be fixed to the inner surface of the lower surface portion 41A, the second piece 44B of the corner member 44 may be fixed to the inner surface of the lower side surface portions 41D and 41E, and the lower engaging member 43 may be fixed to the inner surface of the second piece 44B.

[0041] 11 is a perspective view of a lower cover 4 according to a second embodiment of the present invention. This embodiment differs from the first embodiment in that the lower cover 4 includes a first integrated corner member 45 instead of the left and right corner members 44.

[0042] 12 is a perspective view of the first one-piece corner member 45. The first one-piece corner member 45 includes a first bent portion 451, a second bent portion 452, and a connecting portion 453. The first bent portion 451, the second bent portion 452, and the connecting portion 453 are integrally formed from the same material (a single strip-shaped body). The first one-piece corner member 45 is made of, for example, thick fabric, silicone resin, rubber, elastomer, or plastic, and is less likely to stretch than the fabric of the upper cover body 31 and the lower cover body 41.

[0043] The first bent portion 451 on the left end and the second bent portion 452 on the right end are connected in the width direction (left-right direction) by a connecting portion 453. The first bent portion 451 can be bent upward relative to the connecting portion 453 at a bending line L1. The second bent portion 452 can be bent upward relative to the connecting portion 453 at a bending line L2. The connecting portion 453 corresponds to a first piece, and the first bent portion 451 and the second bent portion 452 each correspond to a second piece.

[0044] As shown in FIG. 11 , the connecting portion 453 is fixed to the outer surface of the lower surface 41A of the lower cover main body 41. The position of the folding line L1 coincides with the left edge of the lower surface 41A of the lower cover main body 41, and the position of the folding line L2 coincides with the right edge of the lower surface 41A of the lower cover main body 41. When not folded, the first folded portion 451 and the second folded portion 452 protrude to the left and right, respectively, from the lower surface 41A. The first lower engaging member 431 is fixed to the first folded portion 451, and the second lower engaging member 432 is fixed to the second folded portion 452. When the first folded portion 451 and the second folded portion 452 are not folded, the first lower engaging member 431 and the second lower engaging member 432 are located below the first folded portion 451 and the second folded portion 452, respectively.

[0045] In this embodiment, the core material 2 can be stored inside the lower cover body 41 without folding the first folding portion 451 and the second folding portion 452. Therefore, during the storage operation, the core material 2 is prevented from interfering with the first folding portion 451 and the second folding portion 452, making the storage operation easier.

[0046] After the filling material 2 is placed inside, the first and second folding portions 451 and 452 are folded. In this state, the first and second folding portions 451 and 452 are respectively positioned on the outer surfaces of the first and second lower side surfaces 41D and 41E of the lower cover body 41, and the first and second lower engaging members 431 and 432 face outward from the first and second folding portions 451 and 452, respectively. In this state, the upper cover 3 (similar to the first embodiment) is placed over the lower cover 4, and the first and second upper engaging members 331 and 332 are engaged with the first and second lower engaging members 431 and 432, respectively. This completes the mattress 1.

[0047] In this embodiment, the connecting portion 453 is provided across the entire width of the lower cover body 41, making it more difficult for the first integrated corner member 45 to shift when the mattress 1 is in use and making it easier to prevent the upper cover body 31 from shifting when turning over in bed. Furthermore, because the first bent portion 451 and the second bent portion 452 are connected by the connecting portion 453, it is easy to position the first bent portion 451 and the second bent portion 452 when attaching the first integrated corner member 45 to the lower cover body 41.

[0048] In this embodiment, the first integral corner member 45 can be seen as a first corner member bendable along the bending line L1 and a second corner member bendable along the bending line L2, which are integrally formed so that their lower portions are connected to each other. The first bending portion 451 and the second bending portion 452 can be seen as a form of a side-positioned portion.

[0049] 3. Third Embodiment Figure 13 is a perspective view of a second integrated corner member 46 according to a third embodiment of the present invention. The second integrated corner member 46 is less stretchable than the material of the upper cover body 31 and the lower cover body 41 and can be used in place of the first integrated corner member 45 according to the second embodiment. The second integrated corner member 46 includes a first L-shaped portion 461 (corresponding to the first corner member), a second L-shaped portion 462 (corresponding to the second corner member), and an extension prevention member 463 made of a material less stretchable than the lower cover body 41. The first L-shaped portion 461 and the second L-shaped portion 462 are connected in the width direction by the extension prevention member 463. The first L-shaped portion 461, the second L-shaped portion 462, and the extension prevention member 463 are each separate members.

[0050] The first L-shaped portion 461 includes a base portion 461A (lower portion) and an upright portion 461B (lateral portion). The second L-shaped portion 462 includes a base portion 462A (lower portion) and an upright portion 462B (lateral portion). The base portions 461A and 462A are connected by an extension prevention member 463.

[0051] The stretch-preventing member 463 is a member that prevents the distance between the first L-shaped portion 461 and the second L-shaped portion 462 from widening, and is preferably made of a material such as string, thick fabric, silicone resin, rubber, elastomer, or plastic that stretches 5 cm or less per meter when pulled with a force of 10 N. In this embodiment that employs the second integrated corner member 46, the lower portions of the first corner member and the second corner member can also be seen as being connected to each other by the stretch-preventing member 463, which is less likely to stretch than the fabric of the lower cover body.

[0052] 4. Fourth Embodiment FIG. 14 shows a side view of a mattress 1 according to a fourth embodiment of the present invention during assembly and a side view of the completed mattress 1.

[0053] The present embodiment differs from the first embodiment in the shape of the upper cover body 31. Specifically, the vertical lengths of the front surface 31B and rear surface 31C of the upper cover body 31 are the same as the vertical lengths of the front surface 41B and rear surface 41C of the lower cover body 41. Side 3i (3k) of the upper cover body 31 slopes upward from the lower end of the front surface 31B toward the rear, and side 3j (3l) slopes upward from the lower end of the rear surface 31C toward the front.

[0054] When the upper cover body 31 having such a shape is placed over the lower cover body 41, the respective bottom ends of the front surface 31B and the rear surface 31C are aligned with the respective bottom ends of the front surface 41B and the rear surface 41C (see the dashed circle in FIG. 14 ). This makes it difficult for the upper cover body 31 to come off the lower cover body 41. Furthermore, by providing an upper engaging member 33 at the location where the side 3i (3k) and the side 3j (3l) are connected (the center in the longitudinal direction of the upper cover body 31), the upper engaging member 33 can be engaged with the lower engaging member 43.

[0055] 5. Other The cover body 5 described above comprises an upper cover 3 that covers the upper surface 2A of the inner material 2 of the mattress 1, and a lower cover 4 that covers the lower surface 2B of the inner material 2. The lower cover 4 comprises corner members that connect a lower portion that is positioned below the inner material 2 with a side portion that is positioned to the side of the inner material 2 (in a direction perpendicular to the up-down direction), and a lower engaging member fixed to the side portion. The upper cover 3 comprises an upper engaging member that engages with the lower engaging member. Therefore, the cover body 5 makes it possible to prevent the upper cover 3 and lower cover 4 from shifting when turning over in bed, etc., without compromising their ease of attachment and detachment.

[0056] The lower cover 4 includes, as corner members, a first corner member disposed at one end in the width direction (left and right direction) and a second corner member disposed at the other end in the width direction, and, as lower engagement members, a first lower engagement member fixed to a lateral positioning portion of the first corner member and a second lower engagement member fixed to a lateral positioning portion of the second corner member. The upper cover 3 includes, as upper engagement members, a first upper engagement member that engages with the first lower engagement member and a second upper engagement member that engages with the second lower engagement member.

[0057] Although the embodiments of the present invention have been described above, the configuration of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit and scope of the invention. In other words, the above embodiments are illustrative in all respects and should not be considered limiting. In the first to fourth embodiments of the present invention, one first corner member and one second corner member are arranged at both ends of the width of the lower cover 4. However, multiple first corner members and multiple second corner members may be arranged at both ends of the width of the lower cover 4, or even at both ends of the length (height direction). The technical scope of the present invention is defined by the claims, not by the description of the above embodiments, and should be understood to include all modifications that fall within the meaning and scope of the claims.

[0058] REFERENCE SIGNS LIST 1 Mattress 2 Filler 2A Upper surface 2B Lower surface 3 Upper cover 3a to 3n sides 4 Lower cover 4a to 4v sides 5 Cover body 21 to 23 Cushion body 30 Opening 31 Upper cover body 31A Upper surface portion 31B Front surface portion 31C Rear surface portion 31D First upper side surface portion 31E Second upper side surface portion 32 Stretch prevention member 33 Upper engaging member 331 First upper engaging member 332 Second upper engaging member 40 Opening 41 Lower cover body 41A Lower surface portion 41B Front surface portion 41C Rear surface portion 41D First lower side surface portion 41E Second lower side surface portion 41F Front upper surface portion 41G Rear upper surface portion 42 Stretch prevention member 43 Lower engaging member 431 First lower engaging member 432 Second lower engaging member 44 Corner member 44A First piece 44B Second piece 45 First integrated corner member 46 Second integrated corner member 441 First corner member 441A First piece 441B Second piece 442 Second corner member 442A First piece 442B Second piece 451 First bent portion 452 Second bent portion 453 Connecting portion 461 First L-shaped portion 461A Base portion 461B Upright portion 462 Second L-shaped portion 462A Base portion 462B Upright portion 463 Extension prevention member L1 Bending line L2 Bending line

Claims

1. A cover body comprising an upper cover that covers the upper surface of a mattress filling material and a lower cover that covers the lower surface of the filling material, wherein the lower cover comprises a corner member that connects a lower portion that is positioned below the filling material and a side portion that is positioned to the side of the filling material, and a lower engaging member that is fixed to the side portion, and the upper cover comprises an upper engaging member that engages with the lower engaging member.

2. The cover body described in claim 1, characterized in that the lower cover comprises, as the corner members, a first corner member arranged at one end in the width direction and a second corner member arranged at the other end in the width direction, and, as the lower engaging members, a first lower engaging member fixed to a lateral positioning portion of the first corner member and a second lower engaging member fixed to a lateral positioning portion of the second corner member, and the upper cover comprises, as the upper engaging members, a first upper engaging member that engages with the first lower engaging member and a second upper engaging member that engages with the second lower engaging member.

3. The cover body according to claim 2, wherein the first corner member and the second corner member are integrally formed so that the lower portions are connected to each other.

4. A cover body as described in claim 2, characterized in that the lower portions of the first corner member and the second corner member are connected using an anti-stretch member that is less likely to stretch than the fabric of the main body of the lower cover.

5. The cover body according to claim 1, wherein the side-positioned portion is bendable relative to the lower-positioned portion.

6. A mattress comprising a cover body according to any one of claims 1 to 5 and a filling material housed in the cover body.

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