mattress

Abstract

This invention provides a divisible mattress that ensures the stability of the mattress sections during compression deformation due to the user's weight and bending deformation such as raising the bed back, while also providing superior sleeping comfort. [Solution] The mattress comprises a plurality of mattress pieces and a sheet-like connecting member that connects adjacent mattress pieces to each other. Each of the adjacent mattress pieces has a cut portion of a predetermined depth that extends in the planar direction of the mattress piece from the connecting surface that connects them to each other. The connecting member is configured such that one end is sandwiched in the cut portion of one adjacent mattress piece and the other end is sandwiched in the cut portion of the other adjacent mattress piece, and the adjacent mattress pieces are connected by frictional force between the cut portions.

Description

Technical Field

[0001] The present invention relates to a split mattress that can be applied to caregiving mattresses, follows the bending deformation of a bed during gatch-up, and can be freely split and connected.

Background Art

[0002] Conventionally, mattresses generally formed from flexible polyurethane foam are well known. Such mattresses are large in size and inconvenient to store and carry.

[0003] In recent years, in order to improve the storability and transportability of mattresses, split mattresses that divide the mattress into a plurality of mattress pieces and connect them during use have been proposed (for example, Patent Document 1).

[0004] In the split mattress described in Patent Document 1, the mattress is divided into a plurality of cushion materials, and each cushion member can be connected by a connecting member. In this split mattress, the connecting members are provided on the side surface portions of the cushion materials, or on both side edge portions of the inner surface in the bending direction of the mattress.

[0005] Further, an assembled mattress that is used by assembling a plurality of cushion members with connecting means has been proposed (Patent Document 2). In this case, the cushion members are made of non-skin polyurethane foam, and the method for connecting each cushion member constituting the assembled mattress is such that at the joint portion of each cushion member, in the width direction or longitudinal direction on the back surface side of the mattress, the members are connected by attaching male surface fasteners. Alternatively, the cushion members are connected to the side surface of the joint portion of each cushion member via a connecting member composed of front and back male surface fasteners.

[0006] Furthermore, a modular mattress that can be easily disassembled and assembled has been proposed (Patent Document 3). The modular mattress is made by combining multiple elastic mat pieces of the same thickness with their respective side end faces facing each other so that the whole is a single flat plate, and is characterized in that a connecting projection is provided on one of the opposing side end faces, with the tip expanding in the width direction, and a connecting groove hole is drilled on the other opposing side end face, with the back expanding in the width direction, and is fitted to the connecting projection in a way that prevents it from being detached in the direction of the projection and to the elastic mat piece in a way that allows it to be detached in the thickness direction. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2002-315651 [Patent Document 2] Japanese Patent Publication No. 2001-281 [Patent Document 3] Japanese Patent Publication No. 2000-139620 [Overview of the project] [Problems that the invention aims to solve]

[0008] In the split mattress described in Patent Document 1 above, adjacent mattress pieces are not directly connected to each other but are connected via a cover. As a result, when the user's weight is applied to the connecting surfaces of adjacent mattress pieces, the adjacent surfaces of each mattress separate and crack (see Figure 12). Figure 12(A) shows the state before compression, (B) shows the state in which cracks occur during compression, and (C) shows the state in which separation occurs after compression. Furthermore, when this split mattress is installed on a bed with a gatch-up function that allows for back and leg elevation, if the bed bends and deforms during gatch-up (hereinafter also simply referred to as gatch-up), the adjacent surfaces of the mattresses separate and cracks occur at the connecting surface of adjacent mattress pieces (see Figure 5 of Patent Document 1). This results in a decrease in sleeping comfort (feel) as the buttocks tend to sink into the cracked area. In addition, especially with nursing care mattresses, there are problems such as a decrease in pressure distribution around the sacrum due to the sinking of the buttocks, and when the legs are elevated at the same time as the back is elevated, a convex crack occurs on the lower limb support surface, increasing contact pressure on the back of the knees and impairing pressure distribution.

[0009] Furthermore, in the assembly-type mattress described in Patent Document 2, the connection of each cushion member is made by attaching male hook-and-loop fasteners in the width direction or longitudinal direction on the underside of the mattress. Therefore, when installed in a bed with a gatch-up function, when the mattress follows the bending deformation of the bed during gatch-up such as raising the backrest, a crack occurs at the connection surface of adjacent mattress pieces, as shown in Figure 13, where the connection surfaces of adjacent mattress pieces are separated (hereinafter also referred to as gatch-up cracks), resulting in the same problems as in Patent Document 1. In addition, when male hook-and-loop fasteners are attached in the width direction on the underside of the mattress, a crack occurs on the upper side, as shown in Figure 12, when compressed by the user's weight. Furthermore, when connecting members made of hook-and-loop fasteners are placed on the connection surfaces of each cushion member, the connection part becomes extremely hard, resulting in problems such as impaired sleeping comfort and pressure distribution.

[0010] Furthermore, the split mattress described in Patent Document 3 has connecting protrusions and connecting grooves that can be detachably fitted together in the thickness direction of the elastic mat pieces. While this is effective against cracking due to compression caused by the user's weight, it is not very effective in suppressing cracking when the bed is raised, and there was room for improvement.

[0011] Therefore, the present invention has been made in view of the above-mentioned points, and its object is to ensure the stability of the connection of the mattress pieces during compression deformation due to the user's weight and bending deformation such as raising the back of the bed, and to provide a split mattress with superior sleeping comfort. [Means for solving the problem]

[0012] According to the present invention, the mattress comprises a plurality of mattress pieces and a sheet-like connecting member for connecting adjacent mattress pieces. Each of the adjacent mattress pieces has a notch of a predetermined depth extending in the planar direction of the mattress piece from the connecting surface that connects them to each other. The connecting member is configured such that one end is sandwiched in the notch of one adjacent mattress piece and the other end is sandwiched in the notch of the other adjacent mattress piece, and the adjacent mattress pieces are connected by frictional force between the notches.

[0013] A split mattress comprises multiple mattress pieces divided longitudinally and a sheet-like connecting member that connects adjacent mattress pieces. One end of the sheet-like connecting member is inserted into a notch in one adjacent mattress piece, and the other end is inserted into a notch in the other adjacent mattress piece. The adjacent mattress pieces are connected by friction between the connecting member and the notches in the mattress pieces. During use, the friction between the notches and the connecting member increases with the user's weight. This prevents cracking at the connecting surface of adjacent mattress pieces during compression by the user's weight. Furthermore, when used as a nursing care mattress and installed on a bed with a gatch-up function, it follows the bending deformation of the bed during gatch-up such as raising the backrest, and prevents cracking at the connecting part during bending deformation. In addition, when stored, the sheet-like connecting member inserted into the notches can be easily removed, allowing the mattress pieces to be easily separated. Therefore, it is possible to provide a split mattress that can be freely divided and connected, ensuring the stability of the connection of the mattress pieces and providing superior sleeping comfort.

[0014] It is also preferable that the connecting member and the mattress piece are configured such that the frictional force between the connecting member and the notch is 250 N or more. By selecting the material, contact area, etc., of the connecting member and the mattress piece, the connection can be maintained by friction between the connecting member and the mattress piece.

[0015] Furthermore, it is preferable that the connecting member be configured such that one end is detachably sandwiched into a notch in one adjacent mattress piece, and the other end is fixed to a notch in the other adjacent mattress piece. This allows for a more secure connection between adjacent mattress pieces and prevents the loss of the connecting member when the mattress is disassembled. It also reduces the sandwiching work required when assembling the mattress by half.

[0016] Furthermore, it is preferable that the connecting member has a surface structure that can directly engage with the inner surface of the notch in the mattress piece. This increases the frictional force between the notch and the connecting member, improving the bonding force and ensuring that the connecting member is securely sandwiched in the notch of the mattress piece, thus providing stable connectivity.

[0017] Furthermore, it is preferable that the mattress pieces are formed from a non-membrane resin foam. This allows a connecting member (for example, a hook-and-loop fastener) having a surface structure that can directly engage with the inner surface of the notched portion of the mattress piece to be securely attached to the mattress piece, thereby improving the bonding strength of the connecting member.

[0018] Furthermore, it is preferable that multiple notches are formed in the width direction of the mattress piece on the connecting surface, and that a connecting member is sandwiched in each of these notches. This makes it possible to reduce the lateral width of the connecting member and to install the connecting member in the required position.

[0019] Furthermore, it is preferable that multiple notches are formed in the thickness direction of the mattress at the connecting surface, and that a connecting member is sandwiched in each of these multiple notches. This allows the mattress to follow the bending deformation of the bed when it is raised, such as when raising the backrest, and to more effectively suppress cracking at the connecting part when it is raised.

[0020] Furthermore, it is preferable that at least one of the multiple cuts and connecting members in the thickness direction of the mattress differs from the other cuts and connecting members. This allows for the optimal design of the shape, material, etc., of the connecting members according to the load and bending deformation state applied to the connecting parts of the mattress pieces.

[0021] Further, it is also preferable that the coupling member is provided with a string-like locking member having a diameter larger than the thickness of the coupling member at at least one end portion, and a round cutout portion corresponding to the diameter of the locking member is formed at the inner end portion of the cut portion. Thereby, the coupling force of the coupling member can be assisted, and the connection stability of the mattress pieces can be improved. Effects of the Invention

[0022] According to the present invention, a mattress having the following excellent effects is provided. (1) The coupling is achieved by the frictional force between the cut portion and the coupling member, and the frictional force between the cut portion and the coupling member increases with the user's weight. Thus, the coupling effect can be exerted without fixing the coupling member to the cut portion, which suppresses cracking at the connection surfaces of adjacent mattress pieces during compression under the user's weight, follows the bending deformation of the bed during gatch-up such as back-raising, and can suppress gatch-up cracking at the connection portion during bending deformation. The connection stability is high during compressive deformation, and bending deformation such as back-raising and leg-raising. (2) The mattress pieces can be connected to each other with a simple structure, and can be freely divided and connected. (3) The mattress can be easily disassembled, folded for storage, and is convenient to handle during movement, storage, cleaning, drying and the like. (4) A split-type mattress can also be easily manufactured. (5) Since the influence on the load deformation characteristics in the thickness direction is small, the mattress can be applied to nursing care mattresses, hardly impairs the sleeping comfort of the mattress, and has excellent body pressure dispersibility. Brief Description of the Drawings

[0023] [Figure 1] This is an exploded perspective view schematically showing the configuration of the mattress according to the first embodiment of the present invention. [Figure 2] (A) is a plan view and (B) is an A-A cross-sectional view showing the assembled state of the mattress according to the first embodiment of the present invention. [Figure 3] This is a side view schematically showing the state of the mattress according to the first embodiment of the present invention during gatch-up such as back-raising. [Figure 4] This is an illustrative diagram explaining the frictional force in the connecting structure of a mattress. [Figure 5] This figure shows experimental results regarding pressure distribution when the backrest of the mattress of the present invention is raised, and a comparison with conventional products. [Figure 6] This figure shows experimental results regarding pressure distribution in a seated position on the edge of the mattress according to the present invention, and a comparison with conventional products. [Figure 7] (A) A plan view and (B) a cross-sectional view of a mattress according to a second embodiment of the present invention. [Figure 8] (A) A plan view and (B) a cross-sectional view of a mattress according to a third embodiment of the present invention. [Figure 9] (A) A plan view and (B) a cross-sectional view of a mattress according to a fourth embodiment of the present invention. [Figure 10] (A) A plan view and (B) a cross-sectional view of a mattress according to a fifth embodiment of the present invention. [Figure 11] (A) A plan view and (B) a cross-sectional view of a mattress according to a sixth embodiment of the present invention. [Figure 12] This is an explanatory diagram illustrating how cracks can occur at the connecting points of conventional split mattresses due to the user's weight. [Figure 13] This is an explanatory diagram illustrating the cracking that occurs when the headrest is raised in conventional split mattresses. [Modes for carrying out the invention]

[0024] Hereinafter, embodiments of the mattress according to the present invention will be described with reference to the figures. The mattress according to the present invention can be applied to nursing care mattresses, is an assembly type that can be divided into multiple areas, follows the bending deformation of the bed when the headrest is raised, and is a foldable, segmented mattress.

[0025] First, the mattress 100 in the first embodiment of the present invention will be described with reference to Figures 1 to 3.

[0026] Figure 1 shows the configuration of a mattress 100 according to the first embodiment of the present invention, and is in a disassembled state. Figure 2 shows the assembled state of the mattress 100, where (A) is a plan view and (B) is a cross-sectional view along line AA. Figure 3 schematically shows the state of the mattress 100 when the back and legs are raised using the gatch-up function.

[0027] As shown in Figures 1 and 2, the mattress 100 according to the first embodiment of the present invention comprises three mattress pieces 10a, 10b, and 10c divided in the longitudinal direction, and a sheet-like connecting member 20 that connects adjacent mattress pieces. The connecting member 20 is sandwiched in notches formed in adjacent mattress pieces and is configured to connect adjacent mattress pieces by frictional force between it and the notches. In this specification, "up and down" refers to the vertical direction when the mattress 100 is installed and used on a bed, that is, the vertical direction in Figures 1 and 2(B).

[0028] Mattress pieces 10a, 10b, and 10c are formed from a cushioning resin foam. Specifically, foamed polyurethane, foamed polyolefin, or foamed silicone can be used as the resin foam. The dimensions and material of mattress pieces 10a, 10b, and 10c, as well as the magnitude of rebound elasticity and compression / recovery characteristics (relationship between displacement in the compression direction and rebound force), are appropriately changed according to the user's body shape and the properties required of the mattress.

[0029] Furthermore, while either closed-cell or open-cell resin foams can be used, open-cell foam resins are preferred from the viewpoint of breathability. For closed-cell or open-cell resins, a larger number of cell cross-sections in the cut surface formed when the slits are constructed is advantageous for increasing frictional force, so it is preferable to have a large cell density (number of cells per unit volume) within the hardness range that allows the mattress to perform well.

[0030] Furthermore, from the viewpoint of further improving friction, breathability, and water permeability, it is more preferable to use a membrane-free foam in which the cellular membrane has been removed and interconnected. This membrane-free foam can be obtained by removing the membrane from the foamed resin after molding using methods such as crushing, alkali treatment, or explosion.

[0031] Furthermore, mattress pieces 10a, 10b, and 10c may be made of a three-dimensional mesh structure formed by melt-laminating and solidifying filamentous thermoplastic resin.

[0032] Furthermore, in mattress pieces 10a, 10b, and 10c, each adjacent mattress piece has a notch of a predetermined depth that extends in the planar direction of the mattress piece, facing each other from the connecting surface at the abutting portion. In this embodiment, mattress piece 10a has a notch 11a, mattress piece 10b has notches 11ba and 11bc, and mattress piece 10c has a notch 11c.

[0033] Furthermore, the width W of the notches 11a, 11ba, 11bc, and 11c is approximately the same as the width W0 of the mattress pieces 10a, 10b, and 10c, except for the ends. The depth D of the notches 11a, 11ba, 11bc, and 11c is preferably 50 to 100 mm. This ensures sufficient engagement force with the sheet-like connecting member 20. If the depth D of the notches 11a, 11ba, 11bc, and 11c is less than 50 mm, the clamping force is insufficient, and the bonding force decreases. On the other hand, if the depth D of the notches 11a, 11ba, 11bc, and 11c is greater than 100 mm, it becomes difficult to insert the ends of the connecting member 20 into the notches. Furthermore, the placement of the notches 11a, 11ba, 11bc, and 11c in the thickness direction of the mattress pieces is preferably 20 to 50 mm from the upper surface (upper edge in the thickness direction) of the mattress pieces 10a, 10b, and 10c, more preferably 25 to 40 mm, and even more preferably 25 to 35 mm. If the notches are close to the surface of the mattress, the stiffness of the connecting member 20 may be picked up, and the pressure distribution performance may decrease. On the other hand, if the notches are far from the surface of the mattress, the connecting force on the surface side that supports the user's weight at the connection point of the mattress pieces becomes smaller, making it easier for cracks to occur at the connection point during compression due to the user's weight or when the connection point of the mattress pieces is bent into a convex shape due to the bed being raised.

[0034] The connecting member 20 is formed from a sheet-like material with low elasticity. Depending on the material of the mattress pieces, the connecting member 20 can achieve a frictional force of 250 N or more, preferably 350 N or more, and more preferably 400 N or more when the normal force is 60 N, and is not particularly limited as long as it is flexible. For example, materials having a fine uneven structure on the surface, such as film, woven fabric, mesh fabric, nonwoven fabric, or mesh-like fabric, can be used. Alternatively, the surface may be coated with a material that can increase the frictional force. From the viewpoint of obtaining a desirable connecting force between adjacent mattress pieces, it is preferable that the material of the connecting member 20 has low leg-lifting elasticity. Specifically, it is preferable that the elongation rate measured by the constant-speed elongation method in accordance with JIS L1096 Method A is 30% or less, more preferably 10% or less, and particularly preferably 5% or less.

[0035] The connecting member 20 is installed such that one end in the longitudinal direction is sandwiched between the notches 11a of one adjacent mattress piece 10a or 11bc of mattress piece 10b, and the other end in the longitudinal direction is sandwiched between the notches 11ba or 11c of the other adjacent mattress piece 10b or 10c. In this embodiment, the width of the connecting member 20 is approximately the same as the width W of the notches of mattress pieces 10a, 10b, and 10c. Furthermore, let L be the length of the connecting member 20, and the length Lp over which the connecting member 20 is sandwiched between the notches is preferably 30 to 50 mm. This makes it possible to ensure engagement force between the connecting member and the notches. If the length Lp over which the connecting member 20 is sandwiched between the notches is shorter than 30 mm, the frictional force decreases, and the connecting force between the mattress pieces tends to decrease. On the other hand, if the length is longer than 50 mm, the connecting member 20 has low elasticity, so the stretch deformation when supporting body weight becomes smaller, which has the same effect as making the body weight-supporting area of ​​the mattress piece harder, and thus the pressure distribution performance tends to decrease. In Figures 1 and 2, the connecting member 20 is sandwiched in the notches of each mattress piece for the same length Lp, but it can also be made to differ within the range of the sandwiched length Lp described above.

[0036] In mattress 100, between mattress piece 10a and mattress piece 10b, one end of the connecting member 20 is sandwiched between the notch 11a of the adjacent mattress piece 10a, forming a first connecting portion 30a, and the other end of the connecting member 20 is sandwiched between the notch 11ba of the adjacent mattress piece 10b, forming a second connecting portion 30b. The first connecting portion 30a and the second connecting portion 30b constitute a connecting structure 30. Similarly, between mattress piece 10b and mattress piece 10c, one end of the connecting member 20 is sandwiched between the notch 11bc of the adjacent mattress piece 10b, forming a first connecting portion 30a, and the other end of the connecting member 20 is sandwiched between the notch 11c of the adjacent mattress piece 10c, forming a second connecting portion 30b. The first connecting portion 30a and the second connecting portion 30b constitute a connecting structure 30. In the first joint 30a and the second joint 30b, both sides of the connecting member 20 are clamped by the notches, resulting in a two-sided friction joint.

[0037] Figure 3 schematically shows the state of the mattress 100 when it is raised to elevate the back and legs. As shown in Figure 3, connecting members 20 are placed in the notches 11a, 11ba, 11bc, and 11c of the mattress 100 to connect adjacent mattress pieces. This prevents cracking of the connecting parts of the mattress 100 during back and leg elevation by the connecting structure 30, allowing it to deform in accordance with the bending deformation of the bed.

[0038] Figure 4 is an illustration illustrating the frictional force in the mattress's connecting structure 30. Figure (A) shows the state without the bed frame raised, (B) shows the force required to hold the end face vertically when the bed frame is raised, and (C) shows the state with the bed frame raised. Note that (B) and (C) are explanatory diagrams for the mountain fold state (corresponding to leg-raising operation) where the mattress is bent into a convex shape, but the valley fold state (corresponding to back-raising operation) where the mattress is bent into a concave shape can be explained using a similar image by inverting the model.

[0039] In this embodiment, the frictional force Ff of the connecting structure 30 is expressed by the following formula, as shown in Figure 4. Ff = μN (1) During the ceremony μ: Static friction coefficient (changes depending on the normal force) N:Normal force In the diagram, the load mg = m (weight of the mattress layer above the joint + user's weight) × g (acceleration due to gravity)

[0040] On the other hand, if there are multiple connecting members 20 (for example, n members arranged in the surface direction or in the thickness direction), the frictional force Ff is expressed as the sum of the frictional forces of each connecting member by equation (2). TIFF2026165939000002.tif2997 formula (2) In the formula, Ffi: frictional force of each connecting member.

[0041] As shown in Figure 4, if the frictional force Ff > the force F1 required to pull the mattress pieces back and hold them in place so that they do not separate, the connected state of the connecting structure 30 is maintained. For example, when raising the legs during the leg-raising operation of the bed frame, F1 is the force required to hold the connecting surfaces (side end surfaces) of the mattress pieces 10bc and 10c that support the back of the knees vertically.

[0042] Therefore, if Ff is the frictional force between the connecting member 20 and the notches 11bc and 11c of the mattress pieces 10b and 10c, and F1 is the force that pulls back and holds the connecting surfaces of the mattress pieces 10b and 10c so that they do not separate, then the connecting member 20 and the mattress pieces 10b and 10c are configured such that Ff > F1, i.e., 250N or more. In this way, by selecting the material, surface structure (surface roughness, etc.), contact area, etc. of the connecting member and the mattress pieces and setting the coefficient of friction of the joint to an appropriate range, the connection can be maintained by friction between the connecting member and the mattress pieces.

[0043] From comparative experiments between the mattress 100 of the present invention, which has the above-described configuration, and a conventional split mattress without connecting members, it is clear that the mattress 100 of the present invention has an effect in suppressing cracking when the headrest is raised. Furthermore, as shown in Figure 5, in experimental results regarding body pressure distribution when the back is raised (backrest angle: 45 degrees, leg elevation: maximum), while conventional split mattresses show slight pressure concentration at the divided parts, the mattress 100 of the present invention can almost completely eliminate this pressure concentration problem. Moreover, as shown in Figure 6, in experimental results regarding body pressure distribution in a seated position, the pressure distribution and ischial tuberosity pressure show no effect due to the division compared to a non-split mattress and a conventional split mattress; that is, they are almost the same as a non-split mattress.

[0044] As described above, according to the mattress 100 of the first embodiment, two adjacent mattress pieces 10a and 10b, and 10b and 10c are each connected by one connecting member 20. Both ends of the connecting member 20 are sandwiched between the notches 11a and 11ba, and 11bc and 11c of the two adjacent mattress pieces 10a and 10b, and 10b and 10c. The connection is maintained by the frictional force between the notches 11a and 11ba, 11bc and 11c and the connecting member 20, thereby maintaining their relative positions. When the mattress 100 is used, the mattress 100 is compressed in the thickness direction by the user's weight, and the frictional force between the notches 11a and 11ba, 11bc and 11c and the connecting member 20 becomes greater. This prevents cracking at the connecting surface of adjacent mattress pieces during compression by the user's weight. Furthermore, when used as a nursing care mattress and installed on a bed with a gatch-up function, it prevents cracking at the connecting part during bending deformation caused by gatch-up such as raising the backrest, ensuring the stability of the mattress piece connection. This allows it to follow the bending deformation of the bed and provides excellent sleeping comfort. In addition, the sheet-like connecting member sandwiched in the cut-out can be easily removed, allowing the mattress pieces to be easily separated. Therefore, it ensures the stability of the connection between mattress pieces, and there is no risk of the connecting member 20 coming into contact with the user's body and causing an unpleasant sensation, providing a divisible mattress 100 with excellent sleeping comfort. Moreover, the connecting part can be freely divided and connected, and the connection at the connecting structure part 30 can be detached, disassembled into three parts, and folded for storage.

[0045] Hereinafter, the mattress 200 in the second embodiment of the present invention will be described with reference to Figure 7.

[0046] Figure 7 shows the configuration of a mattress 200 according to a second embodiment of the present invention, where (A) is a plan view and (B) is a cross-sectional view along line BB. As shown in Figure 7, the mattress 200 according to the second embodiment of the present invention comprises three mattress pieces 10a, 10b, and 10c divided in the longitudinal direction, and a sheet-like connecting member 20A that connects adjacent mattress pieces. The connecting member 20A is sandwiched in notches formed in adjacent mattress pieces and is configured to connect adjacent mattress pieces by frictional force between it and the notches.

[0047] In the mattress 200 according to the second embodiment, the mattress pieces 10a, 10b, and 10c are formed from a cushioning resin foam. It is preferable to use a non-membrane resin foam (non-membrane polyurethane foam) as the resin foam. In addition, in the mattress pieces 10a, 10b, and 10c, each adjacent mattress piece has a notch of a predetermined depth that extends in the planar direction of the mattress piece, facing each other from the connecting surface that connects them at the abutting portion. In this embodiment, a notch 11a is formed in mattress piece 10a, notches 11ba and 11bc are formed in mattress piece 10b, and a notch 11c is formed in mattress piece 10c. In this case, the inner surface of the notch of the non-membrane polyurethane foam functions like a female hook-and-loop fastener, allowing it to be detachably locked to the convex surface of a male hook-and-loop fastener.

[0048] The connecting member 20A is made of a sheet-like material, such as a hook-and-loop fastener, having a surface structure that can directly engage with the inner surface of the notch of the mattress piece. The connecting member 20A is installed so that one end in the longitudinal direction is sandwiched between the notch 11a of one adjacent mattress piece 10a or the notch 11ba of mattress piece 10b, and the other end in the longitudinal direction is sandwiched between the notch 11bc of the other adjacent mattress piece 10b or the notch 11c of mattress piece 10c. In this case, the hook-and-loop fastener as the connecting member 20A can be detachably engaged with the notches of mattress pieces 10a, 10b, and 10c.

[0049] Furthermore, a double-sided hook-and-loop fastener can be used as the connecting member 20A, with male hook-and-loop fasteners on both the upper and lower surfaces. In this case, the connecting strength can be further improved by detachably locking both the upper and lower surfaces of the connecting member into the notches.

[0050] In the mattress 200, between mattress piece 10a and mattress piece 10b, one end of the connecting member 20A is sandwiched between the notch 11a of the adjacent mattress piece 10a, forming a first connecting portion 30Aa, and the other end of the connecting member 20A is sandwiched between the notch 11ba of the adjacent mattress piece 10b, forming a second connecting portion 30Ab. The first connecting portion 30Aa and the second connecting portion 30Ab constitute a connecting structure portion 30A. Similarly, between mattress piece 10b and mattress piece 10c, one end of the connecting member 20A is sandwiched between the notch 11bc of the adjacent mattress piece 10b, forming a first connecting portion 30Aa, and the other end of the connecting member 20A is sandwiched between the notch 11c of the adjacent mattress piece 10c, forming a second connecting portion 30Ab. The first joint 30Aa and the second joint 30Ab constitute the connecting structure 30A.

[0051] As described above, according to the mattress 200 of the second embodiment, in the mattress 200, two adjacent mattress pieces 10a and 10b, and 10b and 10c are connected by a connecting member 20A. Both ends of the connecting member 20A are sandwiched between the notches 11a and 11ba, and 11bc and 11c of the two adjacent mattress pieces 10a and 10b, and 10b and 10c. The space between the notches 11a and 11ba, and 11bc and 11c and the connecting member 20A is detachably secured to the notches 11a and 11ba, and 11bc and 11c by a hook-and-loop fastener mechanism. The frictional force between each notch and the connecting member 20A increases, the bonding force is increased, and the connecting member 20A is securely sandwiched between the notches 11a and 11ba of the mattress pieces 10a and 10b, and between the notches 11bc and 11c of the mattress pieces 10b and 10c.

[0052] This prevents cracking at the connecting surface between adjacent mattress pieces during compression by the user's weight, and when installed on a bed with a gatch-up function, it follows the bending deformation of the bed during gatch-up such as raising the backrest, and prevents cracking at the connecting part during bending deformation. Therefore, it ensures the stability of the connection between mattress pieces, and there is no risk of the connecting member 20A coming into contact with the user's body and causing an unpleasant feeling, thus providing a divisible mattress 200 with superior sleeping comfort. In addition, the connection at the connecting structure part 30A can be detached, and the mattress can be disassembled into three parts, folded, and stored.

[0053] Hereinafter, the mattress 300 in the third embodiment of the present invention will be described with reference to Figure 8.

[0054] Figure 8 shows the configuration of a mattress 300 according to a third embodiment of the present invention, where (A) is a plan view and (B) is a cross-sectional view along line CC. As shown in Figure 8, the mattress 300 comprises three mattress pieces 10a, 10b, and 10c divided in the longitudinal direction, and a plurality (for example, three) connecting members 20B1, 20B2, and 20B3 that connect adjacent mattress pieces. The three connecting members 20B1, 20B2, and 20B3 are arranged at predetermined intervals in the width direction of the mattress 300.

[0055] In the mattress 300 according to the third embodiment, the materials of the mattress pieces 10a, 10b, and 10c are the same as those in the first embodiment described above, so a detailed explanation is omitted here.

[0056] In the mattress pieces 10a, 10b, and 10c of the mattress 300, each adjacent mattress piece has cuts 11a, 11ba, 11bc, and 11c of a predetermined depth that extend in the planar direction of the mattress piece, facing each other from the connecting surfaces that connect them at the abutting portions. Each of the cuts 11a, 11ba, 11bc, and 11c is formed by dividing it into multiple parts. In this embodiment, the cut 11a of mattress piece 10a is composed of three short cuts 11a1, 11a2, and 11a3, the cut 11ba of mattress piece 10b is composed of three short cuts 11ba1, 11ba2, and 11ba3, the cut 11bc is composed of three short cuts 11bc1, 11bc2, and 11bc3, and the cut 11c of mattress piece 10c is composed of three short cuts 11c1, 11c2, and 11c3.

[0057] The connecting members 20B1, 20B2, and 20B3 are formed from a sheet-like material with low elasticity. For example, materials having a fine uneven surface structure, such as films, woven fabrics, mesh fabrics, nonwoven fabrics, and mesh-like fabrics, can be used. Alternatively, the surface may be coated with a material that can increase frictional force. In this embodiment, each of the connecting members 20B1, 20B2, and 20B3 may have the same width or different widths. Also, the length L of each of the connecting members 20B1, 20B2, and 20B3 may be the same length or different lengths.

[0058] Each of the connecting members 20B1, 20B2, and 20B3 has one end sandwiched in a notch of one adjacent mattress piece, forming a first connecting part 30Ba, and the other end sandwiched in a notch of the other adjacent mattress piece, forming a second connecting part 30Bb. The first connecting part 30Ba and the second connecting part 30Bb form a connecting structure part 30B.

[0059] Specifically, between mattress piece 10a and mattress piece 10b, one end of connecting member 20B1 is sandwiched in the notch 11a1 of the adjacent mattress piece 10a, and the other end is sandwiched in the notch 11ba1 of the adjacent mattress piece 10b. One end of connecting member 20B2 is sandwiched in the notch 11a2 of the adjacent mattress piece 10a, and the other end is sandwiched in the notch 11ba2 of the adjacent mattress piece 10b. Connecting member 20B3 is installed so that one end is sandwiched in the notch 11a3 of the adjacent mattress piece 10a, and the other end is sandwiched in the notch 11ba3 of the adjacent mattress piece 10b. Similarly, between mattress piece 10b and mattress piece 10c, one end of connecting member 20B1 is sandwiched in the notch 11bc1 of the adjacent mattress piece 10b, and the other end is sandwiched in the notch 11c1 of the adjacent mattress piece 10c. One end of the connecting member 20B2 is sandwiched between the notches 11bc2 of the adjacent mattress piece 10b, and the other end is sandwiched between the notches 11c2 of the adjacent mattress piece 10c. The connecting member 20B3 is installed so that one end is sandwiched between the notches 11bc3 of the adjacent mattress piece 10b, and the other end is sandwiched between the notches 11c3 of the adjacent mattress piece 10c.

[0060] As described above, according to the mattress 300 of the third embodiment, in the mattress 300, two adjacent mattress pieces 10a and 10b, and 10b and 10c are connected by a plurality of connecting members 20B1, 20B2, and 20B3. Both ends of the connecting members 20B1, 20B2, and 20B3 are sandwiched in the notches of the two adjacent mattress pieces. The connection is made by frictional force between the notches and the connecting members.

[0061] As a result, the mattress 300 of the third embodiment can obtain the same effects as the mattress 100 of the first embodiment described above. Furthermore, by having multiple connecting members 20B1, 20B2, and 20B3 that connect adjacent mattress pieces, the lateral width of the connecting members can be reduced, and the connecting members can be installed at the required positions. In addition, because the connecting members 20B1, 20B2, and 20B3 are independent and discontinuous, the mobility (deformability) in the width direction is improved when the mattress is compressed by body weight, resulting in good pressure distribution. In this embodiment, each notch is formed independently to correspond to each connecting member, but a configuration in which multiple connecting members are sandwiched in a single notch is also possible.

[0062] Hereinafter, the mattress 400 in the fourth embodiment of the present invention will be described with reference to Figure 9.

[0063] Figure 9 shows the configuration of a mattress 400 according to a fourth embodiment of the present invention, where (A) is a plan view and (B) is a cross-sectional view along the DD line. As shown in Figure 9, the mattress 400 comprises three mattress pieces 10a, 10b, and 10c divided in the longitudinal direction, and a plurality (for example, three) connecting members 20C1, 20C2, and 20C3 that connect adjacent mattress pieces. The three connecting members 20C1, 20C2, and 20C3 are arranged at predetermined intervals in the thickness direction of the mattress pieces 10a, 10b, and 10c. The spacing of the connecting members 20C1, 20C2, and 20C3 in the thickness direction of the mattress pieces may be uniform or different.

[0064] In the mattress 400 according to the fourth embodiment, the materials of the mattress pieces 10a, 10b, and 10c are the same as those of the first embodiment described above, so a detailed explanation is omitted here.

[0065] In the mattress pieces 10a, 10b, and 10c of the mattress 400, each of adjacent mattress pieces has notches 11a, 11ba, 11bc, and 11c of a predetermined depth that extend in the planar direction of the mattress piece, facing each other from the connecting surfaces that connect at the abutting portions. Each of the notches 11a, 11ba, 11bc, and 11c is formed from a plurality of notches in the thickness direction of the mattress pieces 10a, 10b, and 10c. In this embodiment, the notch 11a is composed of three notches 11a1, 11a2, and 11a3, the notch 11ba is composed of three notches 11ba1, 11ba2, and 11ba3, the notch 11bc is composed of three notches 11bc1, 11bc2, and 11bc3, and the notch 11c is composed of three notches 11c1, 11c2, and 11c3.

[0066] The connecting members 20C1, 20C2, and 20C3 are formed from a sheet-like material with low elasticity. For example, materials with a fine uneven surface structure, such as films, woven fabrics, mesh fabrics, nonwoven fabrics, and mesh-like fabrics, can be used. Alternatively, the surface may be coated with a material that increases frictional force.

[0067] Each of the connecting members 20C1, 20C2, and 20C3 has one end sandwiched in a notch of one adjacent mattress piece, forming a first connecting part 30Ca, and the other end sandwiched in a notch of the other adjacent mattress piece, forming a second connecting part 30Cb. The first connecting part 30Ca and the second connecting part 30Cb form a connecting structure part 30C.

[0068] Specifically, between mattress piece 10a and mattress piece 10b, one end of connecting member 20C1 is sandwiched in the notch 11a1 of the adjacent mattress piece 10a, and the other end is sandwiched in the notch 11ba1 of the adjacent mattress piece 10b. One end of connecting member 20C2 is sandwiched in the notch 11a2 of the adjacent mattress piece 10a, and the other end is sandwiched in the notch 11ba2 of the adjacent mattress piece 10b. Connecting member 20C3 is installed so that one end is sandwiched in the notch 11a3 of the adjacent mattress piece 10a, and the other end is sandwiched in the notch 11ba3 of the adjacent mattress piece 10b. Similarly, between mattress piece 10b and mattress piece 10c, one end of connecting member 20C1 is sandwiched in the notch 11bc1 of the adjacent mattress piece 10b, and the other end is sandwiched in the notch 11c1 of the adjacent mattress piece 10c. One end of the connecting member 20C2 is sandwiched between the notches 11bc2 of the adjacent mattress piece 10b, and the other end is sandwiched between the notches 11c2 of the adjacent mattress piece 10c. The connecting member 20C3 is installed so that one end is sandwiched between the notches 11bc3 of the adjacent mattress piece 10b, and the other end is sandwiched between the notches 11c3 of the adjacent mattress piece 10c.

[0069] In this embodiment, the width W of each connecting member 20C1, 20C2, and 20C3 is approximately the same as the width of the mattress pieces 10a, 10b, and 10c. Furthermore, the length Lp that is sandwiched in the notch of each connecting member is preferably 30 to 50 mm. If the length Lp is shorter (narrower) than 30 mm, the frictional force decreases, and the connecting force between the mattress pieces tends to decrease. On the other hand, if it is longer (wider) than 50 mm, because the connecting member has low elasticity, the stretch deformation when supporting body weight becomes small, which has the same effect as making the body weight-supporting area of ​​the mattress piece harder, and thus the pressure distribution performance tends to decrease.

[0070] As described above, according to the fourth embodiment of the mattress 400, two adjacent mattress pieces are connected by three connecting members 20C1, 20C2, and 20C3. Both ends of the connecting members 20C1, 20C2, and 20C3 are respectively sandwiched in the notches of the two adjacent mattress pieces. The connection is made by frictional force between the notches and the connecting members.

[0071] As a result, the mattress 400 of the fourth embodiment can obtain the same effects as the mattress 100 of the first embodiment described above. Furthermore, by connecting adjacent mattress pieces in the thickness direction with three connecting members 20C1, 20C2, and 20C3, cracking of the connecting parts of the mattress 400 can be more effectively suppressed when raising the headboard, such as when raising the backrest.

[0072] In the fourth embodiment of the mattress 400, an example was described in which two adjacent mattress pieces are connected by three connecting members 20C1, 20C2, and 20C3 arranged in the thickness direction, but the present invention is not limited thereto. For example, two adjacent mattress pieces may be connected by two connecting members arranged in the thickness direction. The number of connecting members arranged in the thickness direction of the mattress can be four or more, but as the number of connecting members increases, the compressive stiffness of the connecting parts of the mattress increases. Therefore, from the viewpoint of pressure distribution performance, two to four members are preferable, and three members are particularly preferable. Furthermore, among the multiple connecting parts formed in the thickness direction, it is preferable that the connecting force of the connecting part located on the surface side of the mattress, which supports body weight, or on the side that becomes folded when the mattress is bent up, is greatest (the frictional force between the notch constituting the connecting part and the connecting member is greatest). This suppresses cracking in the area where cracking is most likely to occur, and stabilizes the connecting force by arranging connecting parts in other thickness parts of the mattress piece.

[0073] Hereinafter, the mattress 500 according to the fifth embodiment of the present invention will be described with reference to Figure 10. The mattress 500 according to the fifth embodiment is an embodiment that corresponds to a specific example of the configuration of the mattress 400 according to the fourth embodiment in which the connecting force of the joint located on the surface side that becomes folded when bent by raising the headboard is maximized.

[0074] Figure 10 shows the configuration of a mattress 500 according to a fifth embodiment of the present invention, where (A) is a plan view and (B) is a cross-sectional view along line EE. As shown in Figure 10, the mattress 500 comprises three mattress pieces 10a, 10b, and 10c divided in the longitudinal direction, and a plurality (for example, three) connecting members 20D1, 20D2, and 20D3 that connect adjacent mattress pieces. The three connecting members 20D1, 20D2, and 20D3 have different lengths and are arranged at predetermined intervals in the thickness direction of the mattress pieces 10a, 10b, and 10c. The spacing of the connecting members 20D1, 20D2, and 20D3 in the thickness direction of the mattress pieces may be uniform or different.

[0075] In the mattress 500 according to the fifth embodiment, the materials of the mattress pieces 10a, 10b, and 10c are the same as those of the first embodiment described above, so a detailed explanation is omitted here.

[0076] In the mattress pieces 10a, 10b, and 10c of the mattress 500, each of adjacent mattress pieces has cuts 11a, 11ba, 11bc, and 11c of a predetermined depth that extend in the planar direction of the mattress piece, facing each other from the connecting surfaces that connect them at the abutting portion. Each of the cuts 11a, 11ba, 11bc, and 11c is formed from a plurality of cuts in the thickness direction of the mattress pieces 10a, 10b, and 10c. In this embodiment, the notched portion 11a is composed of three notched portions 11a1, 11a2, and 11a3 of different depths, the notched portion 11ba is composed of three notched portions 11ba1, 11ba2, and 11ba3 of different depths, the notched portion 11bc is composed of three notched portions 11bc1, 11bc2, and 11bc3 of different depths, and the notched portion 11c is composed of three notched portions 11c1, 11c2, and 11c3 of different depths.

[0077] Furthermore, in this embodiment, between mattress piece 10a and mattress piece 10b, the depth of the cuts 11a1 and 11ba1 from the top surface is shallower than the depth of the intermediate cuts 11a2 and 11ba2, and the depth of the intermediate cuts 11a2 and 11ba2 is shallower than the depth of the cuts 11a3 and 11ba3 from the bottom surface. On the other hand, between mattress piece 10b and mattress piece 10c, the depth of the cuts 11bc3 and 11c3 from the top surface is deeper than the depth of the intermediate cuts 11bc2 and 11c2, and the depth of the intermediate cuts 11bc2 and 11c2 is deeper than the depth of the cuts 11bc1 and 11c1 from the bottom surface. This configuration increases the contact area between the notches constituting the joint and the connecting member, thereby increasing the frictional force, so that the connecting force of the joint located on the surface side is greatest on the side that becomes folded when the mattress 500 is bent by the gatch-up mechanism.

[0078] The connecting members 20D1, 20D2, and 20D3 are formed from a sheet-like material with low elasticity. For example, materials with a fine uneven surface structure, such as films, woven fabrics, mesh fabrics, nonwoven fabrics, and mesh-like fabrics, can be used. Alternatively, the surface may be coated with a material that increases frictional force. The lengths of the notches 20D1, 20D2, and 20D3 are formed to differ according to the depth of the corresponding notches. That is, the length of connecting member 20D1 < the length of 20D2 < the length of 20D3.

[0079] Each of the connecting members 20D1, 20D2, and 20D3 has one end sandwiched in a notch of one adjacent mattress piece, forming a first connecting part 30Da, and the other end sandwiched in a notch of the other adjacent mattress piece, forming a second connecting part 30Cb. The first connecting part 30Ca and the second connecting part 30Cb form a connecting structure part 30C.

[0080] Specifically, between mattress piece 10a and mattress piece 10b, one end of connecting member 20D1 is sandwiched in the notch 11a1 of the adjacent mattress piece 10a, and the other end is sandwiched in the notch 11ba1 of the adjacent mattress piece 10b. One end of connecting member 20D2 is sandwiched in the notch 11a2 of the adjacent mattress piece 10a, and the other end is sandwiched in the notch 11ba2 of the adjacent mattress piece 10b. Connecting member 20D3 is installed so that one end is sandwiched in the notch 11a3 of the adjacent mattress piece 10a, and the other end is sandwiched in the notch 11ba3 of the adjacent mattress piece 10b. Similarly, between mattress piece 10b and mattress piece 10c, one end of connecting member 20D1 is sandwiched in the notch 11bc1 of the adjacent mattress piece 10b, and the other end is sandwiched in the notch 11c1 of the adjacent mattress piece 10c. One end of the connecting member 20D2 is sandwiched between the notches 11bc2 of the adjacent mattress piece 10b, and the other end is sandwiched between the notches 11c2 of the adjacent mattress piece 10c. The connecting member 20D3 is installed so that one end is sandwiched between the notches 11bc3 of the adjacent mattress piece 10b, and the other end is sandwiched between the notches 11c3 of the adjacent mattress piece 10c.

[0081] In the fifth embodiment of the mattress 500, an example was described in which three connecting members 20D1, 20D2, and 20D3 having different lengths L are arranged at predetermined intervals in the thickness direction of the mattress pieces 10a, 10b, and 10c. However, the present invention is not limited thereto. For example, at least one of the notches 11a, 11ba, 11bc, and 11c may be different from the other notches. Correspondingly, the connecting members 20D1, 20D2, and 20D3 are formed so that at least one of their components differs from the other notches.

[0082] As described above, according to the fifth embodiment of the mattress 500, the mattress 500 is configured to connect two adjacent mattress pieces 10a, 10b, and 10c with a plurality of connecting members 20D1, 20D2, and 20D3 of different lengths in the thickness direction. For example, by arranging a relatively long connecting member 20D3 on the convex side of the bending deformation of the mattress 500 and a relatively short connecting member 20D1 on the concave side of the bending deformation, cracking of the connecting portion of the mattress 500 during headrest adjustments such as raising the back can be more effectively suppressed. In this way, the shape, material, etc. of the connecting members can be optimally designed according to the load and bending deformation state applied to the connecting portion of the mattress pieces.

[0083] Hereinafter, the mattress 600 in the sixth embodiment of the present invention will be described with reference to Figure 11.

[0084] Figure 11 shows the configuration of a mattress 600 according to the sixth embodiment of the present invention. Figure (A) is a plan view, and (B) is a cross-sectional view along the FF line. As shown in Figure 11, the mattress 600 comprises three mattress pieces 10a, 10b, and 10c divided in the longitudinal direction, and a sheet-like connecting member 20E that connects adjacent mattress pieces.

[0085] In the mattress 600 according to the sixth embodiment, the materials of the mattress pieces 10a, 10b, and 10c are the same as those in the first embodiment described above, so a detailed explanation is omitted here.

[0086] In the mattress pieces 10a, 10b, and 10c of the mattress 600, each adjacent mattress piece has a notch of a predetermined depth that extends in the planar direction of the mattress piece, facing each other from the connecting surface that connects them at the abutting portion. In this embodiment, a notch 11a is formed in mattress piece 10a, notches 11ba and 11bc are formed in mattress piece 10b, and a notch 11c is formed in mattress piece 10c. The depth of the notches 11a, 11b, and 11c is preferably 50 to 100 mm. In addition, circular cutouts 12a, 12ba, 12bc, and 12c corresponding to the diameter of the locking member 21E of the connecting member 20E are formed at the inner ends of the notches 11a, 11b, and 11c.

[0087] The connecting member 20E is formed from a sheet-like material with low elasticity. For example, materials having a fine uneven surface structure, such as film, woven fabric, mesh fabric, nonwoven fabric, or mesh-like fabric, can be used. Alternatively, the surface may be coated with a material that can increase frictional force. The connecting member 20E is provided with string-like locking members 21E at both ends in the longitudinal direction, having a diameter larger than the thickness of the connecting member 20E. If the diameter of the string-like locking member 21E is too large, it is likely to cause a decrease in sleeping comfort due to the feeling of a foreign object, and a decrease in localized pressure distribution performance near the locking member 21E. Therefore, a diameter of 5 mm or less is preferable, and 3 mm or less is more preferable.

[0088] In the mattress 600, between mattress piece 10a and mattress piece 10b, one end of the connecting member 20E is sandwiched between the notch 11a of the adjacent mattress piece 10a, forming a first connecting portion 30Ea, and the other end of the connecting member 20E is sandwiched between the notch 11ba of the adjacent mattress piece 10b, forming a second connecting portion 30Eb. The first connecting portion 30Ea and the second connecting portion 30Eb constitute a connecting structure portion 30E. Similarly, between mattress piece 10b and mattress piece 10c, one end of the connecting member 20E is sandwiched between the notch 11bc of the adjacent mattress piece 10b, forming a first connecting portion 30Ea, and the other end of the connecting member 20E is sandwiched between the notch 11c of the adjacent mattress piece 10c, forming a second connecting portion 30Eb. The first joint 30Ea and the second joint 30Eb constitute the connecting structure 30E.

[0089] In the sixth embodiment of the mattress 600, an example was described in which string-like locking members 21E are provided at both ends of the connecting member 20E, but the present invention is not limited thereto. For example, the string-like locking member 21E may be provided at only one end of the connecting member 20E.

[0090] As described above, according to the mattress 600 of the sixth embodiment, two adjacent mattress pieces are connected by a connecting member 20E. String-like locking members 21E, having a diameter larger than the thickness of the connecting member 20E, are provided at both ends of the connecting member 20E. The connecting member 20E is sandwiched between the notches of the two adjacent mattress pieces, and the string-like locking members 21E at both ends are designed to lock into the circular cutouts. This assists the connecting force of the connecting member and improves the connection stability of the mattress pieces.

[0091] In the first to sixth embodiments described above, mattresses 100, 200, 300, 400, 500, and 600 were described in which both ends of the connecting member are detachably sandwiched into the notches of two adjacent mattress pieces. However, the present invention is not limited to this. For example, one end of the connecting member may be detachably sandwiched into the notch of one adjacent mattress piece, and the other end may be fixed to the notch of the other adjacent mattress piece with an adhesive or the like. In this case, adjacent mattress pieces can be securely connected, and when the mattress is disassembled, the connecting member is integrated with one of the mattress pieces, thus preventing the loss of the connecting member. In addition, the sandwiching work when assembling the mattress can be halved.

[0092] The present invention is not limited to the embodiments described above, and its technical scope also includes various design modifications that do not depart from the gist of the invention as described in the claims. [Industrial applicability]

[0093] This invention can be used in a segmented mattress that can be bent and deformed to follow the bending deformation of a bed when the headrest is raised, such as in a nursing care mattress. [Explanation of Symbols]

[0094] 10a, 10b, 10c Mattress pieces 11a, 11ba, 11bc, 11c cut section 11a1, 11ba1, 11bc1, 11c1 cut sections 11a2, 11ba2, 11bc2, 11c2 cut sections 11a3, 11ba3, 11bc3, 11c3 cut sections 12a, 12ba, 12bc, 12c Round cutout section 20, 20A, 20E connecting members 20B1, 20B2, 20B3 connecting members 20C1, 20C2, 20C3 connecting members 20D1, 20D2, 20D3 connecting members 21E Locking member 30, 30A, 30B, 30C, 30D, 30E connection structure 30a, 30Aa, 30Ba, 30Ca, 30Da, 30Ea First joint 30b, 30Ab, 30Bb, 30Cb, 30Db, 30Eb Second joint 100, 200, 300, 400, 500, 600 mattresses

Claims

1. Multiple mattress pieces, It comprises a sheet-like connecting member that connects adjacent mattress pieces, Each of the adjacent mattress pieces has a cut portion of a predetermined depth that extends in the planar direction of the mattress piece from the connecting surface that connects them to each other. The mattress is characterized in that the connecting member is configured such that one end is sandwiched in the notch of one adjacent mattress piece, and the other end is sandwiched in the notch of the other adjacent mattress piece, and the adjacent mattress pieces are connected by frictional force between the connecting member and the notch.

2. The mattress according to claim 1, characterized in that the connecting member and the mattress piece are configured such that the frictional force between the connecting member and the notched portion is 250 N or more.

3. The mattress according to claim 1, characterized in that the connecting member is configured such that one end is detachably sandwiched in the notch of one adjacent mattress piece, and the other end is fixed to the notch of the other adjacent mattress piece.

4. The mattress according to claim 1 or 2, characterized in that the connecting member has a surface structure that can directly engage with the inner surface of the notched portion of the mattress piece.

5. The mattress according to claim 3, characterized in that the mattress piece is formed from a non-membrane resin foam.

6. The mattress according to claim 1 or 2, characterized in that a plurality of notches are formed in the width direction of the mattress piece on the connecting surface, and the connecting member is sandwiched between each of these plurality of notches.

7. The mattress according to claim 1 or 2, characterized in that a plurality of notches are formed in the thickness direction of the mattress on the connecting surface, and the connecting member is sandwiched between each of these plurality of notches.

8. The mattress according to claim 5, characterized in that at least one of the plurality of cut portions in the thickness direction of the mattress and the plurality of connecting members has a configuration that differs from the other cut portions and connecting members.

9. The connecting member is provided with a string-like locking member having a diameter greater than the thickness of the connecting member at at least one end. The mattress according to claim 1 or 2, characterized in that a circular cutout corresponding to the diameter of the locking member is formed at the inner end of the cutout.

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