JP2012110436A - Cushion body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form both end faces of a cylindrical shape in a flat shape.SOLUTION: A groove part 42 extending between both side faces 32, 32 separated in a longitudinal direction of a block material 30 is arranged in a front face 38 of the block material 30 comprising an elastic resin foam and formed in a cuboid shape. A cushion body 10 is formed such that the groove part 42 extends the whole periphery of the outer peripheral face 10c of a cylindrical shape by rounding the block material 30 to form the same in the cylindrical shape such that the front face 38 faces outside. The groove part 42 expandedly and openedly deforms in an axial direction when forming the block material 30 in the cylindrical shape, thereby one end face 10A and the other end face 10B are formed so as to be parallel and flat in the cushion body 10 formed in the cylindrical shape.

Description

  The present invention relates to a cushion body formed into a cylindrical shape by rolling a rectangular parallelepiped block material made of a resin foam having elasticity and abutting and joining the side surfaces of the block material.

  For example, in a mattress, an appropriate number of coil springs are arranged between a plate-like upper cushion material constituting the upper surface and a plate-like lower cushion material constituting the lower surface, and the load from the upper cushion material is applied to each coil spring. It is configured to receive it elastically. However, the coil spring is made of metal made of spring steel or the like, and the material is different from the upper cushion material and lower cushion material made of urethane. Therefore, when the mattress is disposed of, the cushion material is separated from the coil spring. The disposal work has become cumbersome and troublesome.

  Therefore, in recent years, as shown in FIG. 11, a cylindrical cushion body 80 formed of a resin foam has been put to practical use as an alternative member for the metal coil spring. This cushion body 80 is formed by rounding a block member 82 formed in a rectangular parallelepiped shape from a resin foam having elasticity as shown in FIG. The surfaces 84, 84 are formed in a cylindrical shape by bonding with an adhesive. The block member 82 has a plurality of slits 86 extending in the thickness direction along the short direction of the block member 82, and the slit 86 expands on the outer peripheral surface side of the rolled block member 82. (FIG. 11). Then, as shown in FIG. 12, the cushion body 80 is mounted with a cylindrical lower end surface (one side surface spaced apart in the short direction of the block material 82) 88 in contact with the lower cushion material 102 of the mattress 100. The upper cushion material 104 of the mattress 100 is placed on the upper end surface of the cylindrical shape (the other side surface spaced apart in the short direction of the block material 82) 90 and disposed in the mattress 100. . Such a cushion body 80 is disclosed in Patent Document 1.

Special table 2007-520284

  The cushion body 80 is formed by rounding the block member 82 into a cylindrical shape, so that a circumferential length difference is generated so that the outer peripheral surface side of the block member 82 is greatly stretched compared to the inner peripheral surface side. Therefore, the end surfaces 88 and 90 of the obtained cushion body 80 are inclined from the inner side to the outer side in the radial direction due to the pulling of the end edge on the outer peripheral surface side. When the cushion body 80 having the inclined end surfaces 88 and 90 is used in the mattress 100 as described above, as shown in FIG. 12, the one end surface 88 of the cushion body 80 and the lower cushion material 102 and the other end surface. A gap is generated between each of 90 and the upper cushion material 104. Therefore, the bonding area between the cushion body 80 and the upper cushion material 104 and the lower cushion material 102 is reduced, and there is a problem that the cushion body 80, the upper cushion material 104, and the lower cushion material 102 are easily separated during use of the mattress 100. . In addition, when the upper cushion material 104 is bonded to the entire upper end surface 90 of the cushion body 80, the upper cushion material 104 is distorted into irregularities, so that the flat state of the mattress 100 is impaired and the usability is improved. There is also a problem that decreases. Further, after the block member 82 is rounded and formed into a cylindrical shape, a repairing method in which the end faces 88 and 90 are cut flat can be considered. However, the block member 82 having elasticity and easily deformed is processed accurately and cleanly. It is very difficult.

  Accordingly, an object of the present invention is to provide a cushion body in which both cylindrical end faces are formed flat.

In order to solve the above-mentioned problems and achieve the intended purpose, the invention according to claim 1 of the present application provides:
A cushion body formed into a cylindrical shape by rounding a rectangular parallelepiped block material made of a resin foam having elasticity, and abutting and joining the separated side surfaces of the block material,
One surface of the block material is provided with a groove portion between the side surfaces that are joined to each other when the cylindrical shape is formed, and the block material is rolled so that the groove portion faces the outside, so that the entire outer peripheral surface of the cylindrical shape is formed. The gist is that the groove is formed so as to extend over the circumference.

  Therefore, according to the first aspect of the present invention, a groove portion is provided on one surface of the rectangular parallelepiped block material between the side surfaces that are joined to each other when the cylindrical shape is formed, so that the groove portion faces the outside. Since the cushion body is formed so that the groove extends over the entire circumference of the cylindrical outer peripheral surface, the outer peripheral edges of both end faces of the cylindrical cushion body are less likely to be pulled toward each other. The both end faces can be made parallel and flat. Thereby, the cushion body can be bonded in a state where the end surface is appropriately brought into contact with the flat surface of the separate member, and the cushion body and the separate member can be made difficult to peel off.

The invention described in claim 2
A gist of the invention is that the block member is provided with a plurality of hole portions that communicate with a cylindrical outer peripheral surface, and the hole portions are expanded on the cylindrical outer peripheral surface.
Therefore, according to the invention according to claim 2, since the block material is provided with a plurality of holes that communicate with the cylindrical outer peripheral surface, the hole is formed when the block material is rounded to form a cylindrical shape. The outer peripheral surface side is easily stretched by spreading, and the block material can be easily rounded. Also, improvement in air permeability can be expected.

The invention according to claim 3
The gist is that the hole has a slit shape and is formed to extend in the axial direction of the cylindrical shape.
Therefore, according to the third aspect of the invention, since the hole that communicates with the cylindrical outer peripheral surface of the block material is formed in a slit shape extending in the axial direction of the cylindrical shape, the block When the material is rounded and formed into a cylindrical shape, the hole is expanded in the circumferential direction, whereby the outer peripheral surface side is easily extended, and the block material can be easily rounded.

The invention according to claim 4
The gist of the invention is that the hole is formed so as to communicate with the inside and outside of the cylindrical block material.
Therefore, according to the invention which concerns on Claim 4, when a block material elastically deforms, it is accept | permitted that air distribute | circulates into the inside and outside of a block material through the said hole, and air permeability can be improved.

The invention described in claim 5
The groove is formed so as to be recessed in a surface that becomes a cylindrical outer peripheral surface of the block material,
The gist of the present invention is that the block material has a thin portion that is thinned by the groove and a thick portion that is formed with the groove interposed therebetween.
Therefore, according to the fifth aspect of the present invention, when a load is applied to the block material from the end surface direction, the cushion characteristic is mainly caused by compressive deformation of the thin-walled portion, and the thick-walled portion after compressive deformation of the thin-walled portion. The cushion characteristic due to the compression deformation of the portion is expressed, and the cushion characteristic can be changed according to the compression deformation degree of the block material.

  According to the cushion body according to the present invention, both cylindrical end faces can be formed flat.

It is a perspective view which shows the cushion body of 1st Example. (a) is a front view of the cushion body of 1st Example, (b) is a top view of the cushion body of 1st Example. It is explanatory drawing which shows the compression deformation | transformation aspect of the cushion body of 1st Example, Comprising: (a) shows that a thin part mainly compresses and deforms in the deformation | transformation initial stage, (b) shows the compression deformation of a thin part. It shows that the thick portion is compressed and deformed later. It is a perspective view which shows the block material before rounding to a cylindrical shape, Comprising: (a) shows the state seen from the front side used as a cylindrical outer peripheral surface, (b) becomes a cylindrical inner peripheral surface. Shown from the rear side. It is a schematic plan view of the mattress which used the cushion body of 1st Example as a core material. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a front view which shows the cushion body of 2nd Example. It is a dimension figure of the sample equivalent to the cushion object of the 1st example used for the experiment. It is a dimension figure of the sample equivalent to the cushion object of the 2nd example used for the experiment. In an experiment, it is a dimension figure of the sample equivalent to the conventional cushion body. It is a graph which shows an experimental result. (a) is a perspective view which shows the cushion body of a modification, (b) is a perspective view which shows the block material which comprises the cushion body of the modification shown in (a). It is a perspective view which shows an example of the conventional cushion body. It is a fragmentary sectional view of the mattress which used the conventional cushion body shown in FIG. 11 as a core material. It is a schematic perspective view of the block material which forms the conventional cushion body shown in FIG.

  Next, the cushion body according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment.

(First embodiment)
FIG. 1 is a schematic perspective view showing a cushion body 10 of the first embodiment. In the cushion body 10 of the first embodiment, the block material 30 preformed in a rectangular parallelepiped shape shown in FIGS. 4A and 4B is rolled, and the side surfaces 32 and 32 of the block material 30 are butted and joined. By doing so, it is formed in a cylindrical shape. In the first embodiment, unless otherwise specified, the extending direction of the axis passing through the center of the cylindrical block member 30 is “axial direction”, the direction in which the outer circumferential surface is curved is “circumferential direction”, and the cylindrical shape is The radial direction of the end face is referred to as “radial direction”. Accordingly, in the block member 30 in a rectangular parallelepiped state before being formed into a cylindrical shape, the circumferential direction of the cushion body 10 is “length direction”, the axial direction of the cushion body 10 is “height direction”, and the radial direction of the cushion body 10 is Each corresponds to the “thickness direction”.

  As shown in FIGS. 4A and 4B, the block material 30 of the first embodiment is an elastic resin foam formed by foaming a foaming raw material such as polyurethane, and has a length L The dimensional ratio (L: H: D) between the height H and the thickness D is about 7: 2: 1. That is, the block member 30 has side surfaces 32 and 32 that are spaced apart in the length direction, spaced apart in the height direction and extending in the length direction, and is rounded in the length direction to form a cylindrical shape. When forming a cylindrical shape by separating the surface (hereinafter referred to as “lower end surface”) 34 and the other end surface 10B (hereinafter referred to as “upper end surface”) 36 from each other in the thickness direction. The surface (hereinafter referred to as “front surface”) 38 and the surface (hereinafter referred to as “rear surface”) 40 serving as the inner peripheral surface 10D. Of course, the length ratio of the length L, the height H, and the thickness D in the block member 30 is appropriately changed according to the outer dimensions of the cushion body 10.

As the resin foam constituting the block body 30, polyurethane foam, polyolefin foam such as polyethylene, rubber sponge, or the like can be used. Among these, polyurethane foam is most suitable from the viewpoints of ease of production and handleability. The resin foam is a so-called flexible foam having a foaming ratio of about 10 to 60 times and an apparent density of about 16 to 100 kg / m ³ and is soft and has a restorability (no plastic deformation). It is desirable to have an open cell structure. In the first embodiment, a flexible urethane foam having an open cell structure is used as the resin foam. When the block material 30 formed from such a resin foam easily exhibits compressive deformation when applied with a load, bending deformation and twist deformation in the length direction, and the load is released. It is designed to return elastically to its original shape.

  As shown in FIG. 4A, the block member 30 of the first embodiment has a groove 42 that opens in the front surface 38 at the center in the height direction on the front surface 38 side. It is formed so as to extend in the length direction. The groove 42 is formed to be recessed in the front surface 38 of the block material 30, and the depth S in the thickness direction from the front surface 38 is set to about ½ of the thickness D of the block material 30, The opening width T in the height direction on the front surface 38 is set to about 1/6 of the height H of the block material 30. Therefore, the block member 30 of the first embodiment has a thin portion 44 extending in the length direction along the groove portion 42, and is located on both sides in the height direction across the groove portion 42 and is thicker than the thin portion 44. It consists of thick parts 46 and 46 formed in the meat. As a result, when the block member 30 of the first embodiment is formed in a cylindrical shape by rounding in the length direction so that the front surface 38 is on the outside, the front surface 38 side of each thick portion 46, 46 extends in the length direction. With the deformation, the groove portion 42 can be expanded in the height direction (FIG. 2A).

  Further, as shown in FIGS. 4 (a) and 4 (b), the block member 30 of the first embodiment has a plurality of holes that communicate with each other in the thickness direction and open circularly on the front surface 38 and the rear surface 40, respectively. The portions 48 and 50 are formed scattered throughout the block material 30. In other words, twelve first hole portions 48 are formed in series in the thick direction 46 of the block member 30 at equal intervals in the length direction. Further, twelve second hole portions 50 are formed in series in the thin portion 44 of the block member 30 at equal intervals in the length direction. In addition, each 1st hole 48 and each 2nd hole 50 are formed by shifting 1/2 pitch in the length direction (FIG.4 (b)). The first hole 48 and the second hole 50 are expanded or contracted in the length direction when the block member 30 is formed in a cylindrical shape by rounding in the length direction so that the front surface 38 is outside. This is to make the block member 30 easy to round by being deformed into the shape. That is, when the block member 30 is rounded and formed into a cylindrical shape, the first hole portion 48 and the second hole portion 50 are expanded in the length direction in a portion where the block member 30 extends in the length direction. However, in the portion where the block material 30 is contracted in the length direction, the first hole 48 and the second hole 50 are deformed in a contraction manner in the length direction (FIGS. 2A and 2). b)).

  In the cushion body 10 of the first embodiment, as shown in FIG. 2B, the block member 30 formed as described above is rounded so that the front surface 38 is on the outer side, and both side surfaces 32, 32 of the block member 30 are formed. Are joined to each other with an adhesive or the like to form a cylindrical shape. Thereby, at the center of the cushion body 10, as shown in FIGS. 1 and 2B, a space 12 surrounded by the inner peripheral surface 10D and extending in the axial direction and opening at both ends in the axial direction is defined. It is made. And in the block material 30 formed in the cylindrical shape, as shown in FIG. 2A and FIG. 2B, each first hole 48 extending in the radial direction is an opening on the outer peripheral surface 10C side. 48A is expanded in the length direction so as to have a horizontally long elliptical shape, and the opening 48B on the inner peripheral surface 10D side is deformed in the length direction so as to be closed. On the other hand, each of the second holes 50 extending in the radial direction is deformed so that the opening 50A on the groove 42 side contracts in the length direction to have a vertically long elliptical shape, and the opening 50B on the inner peripheral surface 10D side is In the length direction, it is deformed in a contracted manner and is in a closed state.

  As shown in FIG. 2 (a), the groove portion 42 is formed by rolling the block member 30 into a cylindrical shape, and extending the outer peripheral surface 10C side (front surface 38 side) of the block member 30 in the circumferential direction. By being pulled in the direction, it is expanded in the axial direction and the opening width T is larger than before the deformation. Thus, in the cushion body 10 of the first embodiment, one end face 10A and the other end face 10B located at both ends in the axial direction are parallel and flat with each other because the outer peripheral end side is not pulled.

  In the cushion body 10 of the first embodiment, the thin portion 44 formed by the groove portion 42 is weaker than the thick portion 46 and is easily compressed and deformed. Therefore, when a load is applied from the axial direction to the other end face 10B of the cushion body 10, at the initial stage of load input, as shown in FIG. The load is supported, and soft cushioning properties are developed. On the other hand, as the load is applied, after both the thick portions 46 and 46 come into contact with each other by compressive deformation of the thin portion 44, as shown in FIG. 3B, the thick portions 46 and 46 support the load. Therefore, a cushion characteristic harder than that in the case where only the thin portion 44 is compressed and deformed is developed. Thus, according to the cushion body 10 of the first embodiment, the balance of the compressive load is improved as a whole, and the compressive load can be adjusted as appropriate while maintaining appropriate cushion characteristics. That is, according to the cushion body 10 of the first embodiment, as described above, it is possible to improve the cushion characteristic that the stress (compressive load) becomes large when it is compressed and deformed to some extent, and it is difficult to bottom out.

  5 and 6 are explanatory views showing a case where the cushion body 10 of the first embodiment configured as described above is used for the mattress 100. FIG. The cushion body 10 is disposed in the mattress 100 in such a posture that its axial direction is the thickness direction of the mattress 100, one end surface 10A abuts on the upper surface of the lower cushion material 102 of the mattress 100, and the other end surface 10B. The mattress 100 is in contact with the lower surface of the upper cushion material 104. Since one end surface 10A and the other end surface 10B of the cushion body 10 are formed in parallel and flat, the entire surface of the one end surface 10A is bonded to the upper surface of the lower cushion material 102 and the other end surface. The entire surface of 10B is bonded to the lower surface of the upper cushion material 104. The cushion body 10 is used in a portion corresponding to the shoulder of the user who is lying on the mattress 100. Reference numerals 106 and 108 in FIG. 5 are cushion bodies having cushion characteristics different from those of the cushion body 10 of the first embodiment, and the mattress 100 has different cushion characteristics for each part.

  According to the cushion body 10 of the first embodiment configured as described above, the outer peripheral surface of the cushion body 10 when the rectangular block material 30 made of a resin foam having elasticity is formed into a cylindrical shape. Since the groove portion 42 extending between the side surfaces 32 and 32 joined to each other is provided on the front surface 38 that becomes 10C, when the block member 30 is formed in a cylindrical shape, the end surface 10A and the other end surface 10B It becomes difficult for the outer peripheral edges to be pulled toward each other, and the one end face 10A and the other end face 10B can be made parallel and flat. As a result, the cushion body 10 can be bonded to the flat upper surface of the lower cushion material 102 of the mattress 100 by properly abutting one end face 10 </ b> A without a gap, and to the flat lower surface of the upper cushion material 104. The end surface 10B can be adhered by being properly brought into contact with no gap. Accordingly, a sufficient bonding area is secured between the cushion body 10 and the upper cushion material 104 and the lower cushion material 102, and the cushion body 10, the upper cushion material 104, and the lower cushion material 102 are peeled off during use of the mattress 100. Can be prevented. As shown in FIGS. 5 and 6, even if the plurality of cushion bodies 10 of the first embodiment are arranged in the mattress 100, the other end face 10B of each cushion body 10 is flat. The flat state of the mattress 100 is not impaired, and the feeling of use does not decrease.

  And in the cushion body 10 of 1st Example, since the several 1st hole part 48 and 2nd hole part 50 which lead to the front surface 38 of the block material 30 are provided, this block material 30 is rounded and it is made cylindrical shape. At this time, each of the first hole 48 and the second hole 50 is deformed so as to expand or contract in the circumferential direction. In addition, since the first hole portions 48 and the second hole portions 50 are formed in series in the length direction of the block member 30 at equal intervals, the block member 30 is used when the block member 30 is rolled. The whole is easily deformed and can be easily formed into a beautiful cylindrical shape.

  In the cushion body 10 of the first embodiment, the first hole portion 48 and the second hole portion 50 open to the outer peripheral surface 10C and the inner peripheral surface 10D of the block member 30 formed in a cylindrical shape, and enter inward and outward directions. Since they are formed so as to communicate with each other, air flow through the holes 48 and 50 is allowed when the block member 30 is compressed and deformed in the axial direction or when it is elastically restored to the original shape. Therefore, since air flows through the first hole 48 and the second hole 50, air permeability is ensured, and it is possible to prevent moisture and heat from being trapped in the space 12. In addition to the above characteristics, the cushion characteristic is required to have a low hysteresis loss rate (JIS K6400-2) and to return quickly after the load is released. Here, the hysteresis loss rate indicates a mechanical energy loss in one cycle of deformation and recovery, and is obtained from a force-deflection curve obtained by performing a compressive load deflection test. The higher the hysteresis loss rate, the slower the recovery, and the repulsive force at the time of opening after the push-in decreases, so that a so-called viscous foam is obtained. Therefore, since the cushion body 10 of the first embodiment has good air permeability by providing the first hole portion 48 and the second hole portion 50, air can easily flow into the block member 30 when the load is released. The elastic recovery to the original shape is accelerated and the hysteresis loss rate is reduced.

  Furthermore, since the cushion member 10 of the first embodiment is provided with the thin portion 44 and the thick portion 46 on the block member 30, when the load is applied to the block member 30 from the axial direction, the thin portion Since the soft cushion characteristic due to the compression deformation 44 and the hard cushion characteristic due to the compression deformation of the thick portion 46 are obtained, the cushion characteristic can be changed according to the magnitude of the load. That is, even if the resin foam constituting the block material 30 is formed from a single foaming raw material, different cushion characteristics can be obtained.

(Second embodiment)
FIG. 7 is a schematic perspective view showing the cushion body 60 of the second embodiment. The cushion body 60 of the second embodiment is based on the block material 82 that is preformed in a rectangular parallelepiped shape shown in FIG. 13 and forms the conventional cushion body 80 shown in FIG. 4 is formed in a cylindrical shape from a block material 62 provided with a groove portion 68 similar to the block material 30 shown in FIG. That is, the block material 62 forming the cushion body 60 of the second embodiment has a plurality of slit-shaped holes along the height direction that is the axial direction of the cylindrical shape, on the front surface 70 that becomes the cylindrical outer peripheral surface 60C. 76 is formed so as to communicate with the front surface 70, and a groove 74 is provided across the side surfaces 64, 64 on the front surface 70 which forms a cylindrical outer peripheral surface 60 </ b> C. In other words, the cushion body 60 of the second embodiment is obtained by changing the first hole portion 48 and the second hole portion 80 in the cushion body 10 of the first embodiment to the slit type and changing the formation position and size thereof. It can be said. In the cushion body 60 of the second embodiment, the block material 62 provided with the plurality of slit-like holes 76 and the groove 74 is rounded so that the front surface 70 on which the groove 74 is formed faces outward. The two side surfaces 64, 64 are abutted and joined to form a cylindrical shape.

  In the cushion body 60 according to the second embodiment, the block member 62 is formed into a cylindrical shape, so that the outer peripheral surface 60C side of each slit-like hole 76 is deformed and opened in the circumferential direction. Similar to the first hole 48 and the second hole 50 of the first embodiment, this contributes to easy rounding of the block material. Further, since the cushion body 60 of the second embodiment is provided with each slit-like hole 76 to ensure air permeability, air can easily flow into the block material when the load is released, and the original shape is obtained. The elastic recovery becomes faster and the hysteresis loss rate decreases. Further, when the block member 60 is rounded and formed into a cylindrical shape, the groove portion 74 is stretched in the circumferential direction and pulled in the axial direction on the outer peripheral surface 60C side (front surface 70 side) of the block member 60. In comparison, the opening width T is increased by expanding in the axial direction. Thereby, also in the cushion body 60 of 2nd Example, since one end surface 60A and the other end surface 60B located in the both ends of an axial direction are not pulled by the outer peripheral end side, they are mutually parallel and flat. Furthermore, the cushion body 60 of the second embodiment provides the same cushion characteristics as the cushion body 10 of the first embodiment by providing the groove 74. Accordingly, the cushion body 60 of the second embodiment exhibits the same operational effects as the cushion body 10 of the first embodiment. In the cushion body 60 of the second embodiment, since the slit-like hole 76 is formed in the block member 60, the first hole 48 and the second hole 50 having a round through hole are provided. Compared to the cushion body 10 of the example, since the volume of the resin foam can be increased with the same outer size, the bottom of the resin foam is less likely to occur.

(Experimental example)
A compression deflection load test was performed on the cushion body 10 (Example 1) of the first example and the cushion body 60 (Example 2) of the second example, and the cushion characteristics were confirmed. In addition, as a comparative example, a compressive deflection load test was performed on the cushion body (Comparative Example 1) and the rectangular parallelepiped block material (Comparative Example 2) cited as the conventional example (FIG. 11). In Example 1, Example 2, Comparative Example 1 and Comparative Example 2, a flexible urethane foam (foaming ratio: 40 times, apparent density: 25 kg / m ³ ) is used as a resin foam constituting the block material. As shown in FIG. 8a, the cushion body 10 of Example 1 has a size of length (L) 270 mm × height (H) 60 mm × thickness (D) 35 mm, and a groove portion at the size and position shown in FIG. 42, the block material 30 in which the 1st hole 48 and the 2nd hole 50 were formed is rounded, and the side surfaces 32 and 32 which were faced | matched are joined with an adhesive agent, and it is formed in the cylindrical shape. As shown in FIG. 8b, the cushion body 60 of Example 2 has a length (L) 230 mm × height (H) 60 mm × thickness (D) 30 mm, and has the groove 74 and the dimensions shown in FIG. The block material 62 in which the slit-like hole 76 is formed is rounded, and the abutted side surfaces 64 and 64 are joined with an adhesive to form a cylindrical shape. The cushion body of Comparative Example 1 is formed in a cylindrical shape by rounding the block material 82 shown in FIG. 8c and joining the butted side surfaces 84 and 84 with an adhesive. The block material 82 used for the cushion body of the comparative example 1 is formed with a slit 86 similar to the block material 62 of the second embodiment. In Comparative Example 2, a block material formed in a size of 166 mm in length, 166 mm in height, and 60 mm in thickness is used as it is without being processed such as bending or hole.

  The compression deflection load test was performed based on the JIS K6400-2 B method. In Example 1, Example 2, and Comparative Example 1, the four cushion bodies are arranged in 2 rows and 2 columns in a posture in which the axial direction of the cylindrical shape is set up (a posture in which the short side of the block material extends vertically). The center of the end face was compressed to 75% with a disc of φ200. That is, the vertical dimension of the block member 30 (60, 82) in FIGS. 8a to 8c is the initial height. In Comparative Example 2, one block material was placed in a posture in which the thickness direction was vertically aligned, and the center of the upper end surface of the block material was compressed to 75% with a disk of φ200. That is, in Comparative Example 2, the thickness of the block material is the initial height. In the compression deflection load test, preliminary compression is not performed. FIG. 9 shows the relationship between the deflection amount (%) and the load (N) for each of Example 1, Example 2, and Comparative Examples 1 and 2. For each of Example 1, Example 2, and Comparative Examples 1 and 2, the hysteresis loss rate (inner area of the compression / release curve / area sandwiched between the lower side of the curve during compression and the X axis) is defined as JIS K6400. Calculated based on -2. The results are shown in Table 1.

  As shown in FIG. 9, in Comparative Example 2, the load at the beginning of compression is high, and the amount of deflection at which stress is reduced due to deformation of the cell shape in the block material due to compression is substantially flat at around 50%. Then, when the cell is crushed and the internal space is reduced, the load is increased again, and the deflection load curve becomes S-shaped. In Example 1 and Example 2, the hardness at the initial stage of compression is lower than that of Comparative Example 2 due to the presence of the groove portions 42 and 74 over the entire outer peripheral surface of the block materials 30 and 62, and the amount of deflection is 0. At ˜50%, the compression deflection curve is linear. In Comparative Example 1, since there is no groove on the outer peripheral surface of the block member 82, the hardness at the beginning of compression is lower than that in Comparative Example 2, but is higher than in Example 1 and Example 2, and the deflection load curve is It is slightly S-shaped. Therefore, in Example 1 and Example 2, the groove portions 42 and 74 are formed on the outer peripheral surface, so that the load at the beginning of compression (deflection amount: 0 to 40%) is lower than that in Comparative Example 1, and in the initial stage of load input. It can be seen from Comparative Example 1 that it has an appropriate cushioning characteristic to receive the load softly. Further, Example 2 has appropriate cushioning characteristics such that the load is higher than that of Comparative Example 1 when the deflection amount is between 40% and 70%, and the load is received as the input of the load proceeds. I understand. Moreover, as shown in Table 1, Example 1 and Example 2 have a lower hysteresis loss rate than Comparative Examples 1 and 2, and the cushion body 10 of the first example and the cushion concept 60 of the second example are as follows. When the compressed load is released, it can be confirmed that it has excellent restoring force to quickly return to the original shape.

(Example of change)
The cushion body 10 of the present invention is not limited to the form exemplified in each of the embodiments, and can be variously changed.
(1) As shown in FIG. 10B, the block member 30 constituting the cushion body 10 has long slit-like second grooves 52 extending in the thickness direction on the lower end surface 34 and the upper end surface 36. A plurality may be provided in the vertical direction at every required interval. As shown in FIG. 10A, the cushion body 10 formed by rolling the block member 30 provided with the second groove portion 52 into a cylindrical shape is accompanied by bending of the lower end surface 34 and the upper end surface 36. The outer peripheral edge side of each of the second groove portions 52 is deformed so as to expand in the circumferential direction, and the block material 30 is easily rounded into a cylindrical shape.
(2) The formation position of the groove 42 is not limited to the center in the height direction of the front surface 38 of the block member 30, but is an intermediate position biased to the upper end surface 36 of the front surface 38 or the lower end surface 34 of the front surface 38. It may be formed at an intermediate position that is biased toward the center.
(3) The groove portion 42 is not limited to the concave groove shape formed in the concave shape on the front surface 38, and may be a slit-shaped cut. When the block member 30 provided with such a slit-shaped groove 42 is bent in a cylindrical shape and the outer peripheral surface 10C side is pulled in the axial direction, the groove 42 is deformed in an expanded manner. The end face 10A and the other end face 10B can be made parallel and flat.
(4) The number of the groove portions 42 is not limited to one, and a plurality of groove portions 42 may be formed side by side in the width direction.
(5) The opening shape of the 1st hole 48 and the 2nd hole 50 is not limited circularly, An ellipse, a polygon, etc. may be sufficient. Further, the number and positions of the first holes 48 and the second holes 50 are not limited to the embodiment.
(6) The first hole 48 and the second hole 50 may be slits cut from the front surface 38 in the thickness direction of the block material 30.
(7) If it is not necessary to consider the air permeability, the first hole portion 48 can be easily rounded even if the first hole portion 48 opens only to the front surface 38 and does not penetrate in the thickness direction of the block material 30. Similarly, if it is not necessary to consider the air permeability, the second hole portion 50 can easily round the block material 30 even if the second hole portion 50 opens only in the groove portion 42 and does not penetrate in the thickness direction of the block material 30. In addition, it is good also as what penetrated any one of the 1st hole 48 and the 2nd hole 50 in the thickness direction of the block material 30. FIG. Furthermore, each of the 1st hole 48 and the 2nd hole 50 may mix a penetration form and a non-penetration form.
(8) In the embodiment, the case where the cushion body 10 is implemented on the mattress 100 is illustrated. Can also be implemented.

10,60 cushion body, 10D, 60D outer peripheral surface, 30,62 block material 32,64 side surface, 38,70 front surface (surface to be outer peripheral surface), 42,74 groove portion 44 thin portion, 46 thick portion, 48 first Hole (hole), 76 hole

Claims (5)

A cushion body formed into a cylindrical shape by rounding a rectangular parallelepiped block material made of a resin foam having elasticity, and abutting and joining the separated side surfaces of the block material,
One surface of the block material is provided with a groove portion between the side surfaces that are joined to each other when the cylindrical shape is formed, and the block material is rolled so that the groove portion faces the outside, so that the entire outer peripheral surface of the cylindrical shape is formed. A cushion body, wherein the groove portion is formed so as to extend over the circumference.   The cushion body according to claim 1, wherein the block member is provided with a plurality of holes that communicate with a surface that is a cylindrical outer peripheral surface, and the hole is expanded on the cylindrical outer peripheral surface.   The cushion body according to claim 2, wherein the hole has a slit shape and is formed to extend in the axial direction of the cylindrical shape.   The cushion body according to claim 2 or 3, wherein the hole portion is formed so as to communicate with the inside and outside directions of the cylindrical block member. The groove is formed so as to be recessed in a surface that becomes a cylindrical outer peripheral surface of the block material,
The said block material is a cushion body as described in any one of Claims 1-4 which has the thin part thinned by the said groove part, and the thick part formed on both sides of this groove part.

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