JP2016106831A - Cushion body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cushion body that is lightweight and gives a person excellent cushioning properties when the person sits thereon or lies on his/her back thereon.SOLUTION: The problem is solved by a cushion body 1 that includes a plurality of rod-like or flat-plate-like supports 2 that are made of a synthetic resin foam of which amount of bending deflection is greater than or equal to 20 mm measured according to a method described in JIS K7221-2:2006 and of which pressing force is 2 to 100 N at 20 mm deflection and that are bent and deformed by a load of a person sitting or a person lying on his/her back thereon; and an elastic body 4 that is disposed on back surfaces of the supports, enables the supports to be bent and deformed, and has a damping property so as to be compressed and deformed in response to the bending and deformation of the supports by the load of the person sitting or the person lying on his/her back thereon.SELECTED DRAWING: Figure 1

Description

  The present invention is used as a component for vehicle seats such as vehicles, ships and airplanes, sofas, chairs, cushions, beds, sleepers, mattresses, mattresses, pillows, mats, etc., used when a person is sitting or lying on the back The present invention relates to a cushion body that promotes weight reduction, is highly recyclable, and is comfortable to sit and sleep.

  In general, a cushion body has a structure in which a soft cushioning material such as urethane foam is placed on a structure that finally supports pressing such as a wire stretched on a frame or a flat support, and the entire surface is covered with a skin. Have. Also, cushions, bed mattresses, and the like themselves do not contain a structure, but they are generally used on a structure that can support the pressure of the human body, such as a floor or a frame of a bed.

  In general cushion bodies, vibrations and impacts applied to the cushion material are mainly reaction forces when a soft cushion material such as urethane foam interposed between the structure and the skin is bent in the compression direction. It was alleviated by restoring force and deflection.

  Further, as a technique related to weight reduction of a vehicle seat cushion, Patent Document 1 shows a frame shape of a seat frame, a cross section of the seat frame has a mountain shape, and one side of the mountain shape on a frame shape inner peripheral side of the seat frame. A concave curved surface is formed by covering the seat frame with an elastic net and pulling its peripheral edge from above the chevron of the seat frame and fixing it to the other side of the chevron. A technique is disclosed in which the seating surface is stretched so as to form a seating surface, and an angle is provided between the net and the inclined surface of the seat frame.

  As another technique related to weight reduction, Patent Document 2 discloses a base plate detachably attached to a seat frame, a block disposed on the base plate, a spring plate disposed on the block, and the spring plate. A seating portion having a skin 7 covering the surface, wherein the block is disposed so as to form a predetermined space between the base plate and the spring plate, and the spring plate is a foam having elasticity. One of (polypropylene) bead foam, PE (polyethylene) bead foam, PP foam, PE foam, AS resin (acrylonitrile / styrene resin) foam, EVA (ethylene vinyl acetate copolymer resin) and urethane foam material Formed with a foam formed of It is a technique related to a vehicle seat flexes the space is disclosed when a force to said base plate direction was added.

  Next, when a cushion body is incorporated for a bed mattress, the bed mattress generally uses urethane foam as a cushioning material. As a technique relating to the weight reduction technology of the bed mattress, Patent Document 3 discloses that the support is rectangular. The surface is provided with a plurality of grooves that reach both ends in the short side direction, the grooves have a depth of 30 to 70 mm, a width of 15 to 80 mm, and a core material of 10 to 40 mm in thickness. , Made of a rectangular urethane foam having a hardness of 100 to 300 N, the short side is folded in two in the long side direction, both ends of the long side are fitted and supported in one concave groove of the support, and the frame is A technique provided to surround the periphery of the support is disclosed.

JP 2002-28044 A Japanese Patent No. 4009490 JP 2009-279086 A

In conventional general vehicle seat cushions, urethane foam is used as a cushioning material, and the cushioning properties are extremely high and the comfort is excellent. However, the urethane foam has a problem that it is inferior in recycling performance. Furthermore, in addition to being required to have optimal cushioning regardless of the weight of the occupant's weight, the vehicle seat cushions can cause the occupant's body to feel uncomfortable with the vertical acceleration applied to the occupant as the vehicle moves. No cushioning is required. On the other hand, to reduce fatigue when riding for a long time, it is necessary to support the occupant's body in the correct position and posture. For this reason, the function cannot be satisfied with only a very soft urethane foam, and the density of the urethane foam needs to be a certain level or more in order to secure a certain degree of rigidity. It was.

In the technique described in Patent Document 1, the net material that supports the pressure applied by the occupant is drawn into the seat frame installed around the seat cushion and is firmly fixed, and the pressure applied by the occupant's seating is finally transmitted through the net material. It was supported by the rigidity of the seat frame. Therefore, the structure of the seat frame must maintain a certain level of strength. For this reason, although the weight of the net material itself corresponding to the conventional cushion material is light, the weight of the seat frame tends to increase and the overall weight There was a problem that the reduction effect was not sufficient.

Furthermore, the cushioning property of the net material is limited because it is obtained mainly by the elongation of the material, and there is a tendency that sagging occurs due to long-term use and the merchantability is inferior. In addition, since the flat net material is stretched around the seat frame, the basic seat cushion shape is flat, and the three-dimensional shape necessary to support the occupant's body in an optimal position is obtained. As a result, there is a problem that the passengers feel uncomfortable. This is because an unstable hammock-like net material cannot stably support the occupant's body when a lateral G is applied to the occupant by the movement of the automobile.

Next, as for the technique of Patent Document 2, the spring plate is a plate-like foam having a substantially rectangular outer shape, and a plurality of grooves are formed in the lateral direction on the side of the spring plate on which an occupant sits. However, if the groove is shallow, flexibility cannot be given, and if the groove is deep, when the cushion material bends, excessive tensile force concentrates on the connecting part of the remaining groove bottom, causing large elongation deformation. There was a high risk of permanent deformation that could not be restored or fracture. If even a part of the connecting portion at the groove bottom is broken, the support is lost at once, the apparent hardness of the entire cushioning material is drastically lowered, and the function as the cushioning material is greatly impaired. Therefore, it is practically difficult to design the deflection of the cushion material to a certain level or more in order to avoid breakage, and it is difficult to provide a sufficient fit and comfort when seated.

Moreover, although the technique of patent document 2 has described that it can obtain a favorable seating feeling personally by selecting suitably the block from which height differs according to a passenger | crew's physique, There was a problem that in reality it had to be difficult to implement, because it had to be changed to a block of height suitable for me before sitting down by light weight.

Next, although the technology of Patent Document 3 is lighter than a conventional mattress using a metal spring, since the urethane foam is used for the support 2 and the core, the recycling performance is inferior and the weight is reduced. There was a problem that there was a limit.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cushion body that is rich in cushioning and fitting properties when sitting or lying on a person, and is lightweight and excellent in recyclability.

In the present invention, the synthetic resin foam is flexible and capable of bending deformation and is excellent in resilience. The method described in JIS K7221-2: 2006 (23 ° C. ± 2 ° C., relative humidity 50 ± 350mm long with skin removed in 5% atmosphere
A test piece having a width of 100 mm and a thickness of 25 mm is pressed until the maximum deflection is 90 mm at a fulcrum distance of 300 mm and a test speed of 20 ± 1 mm / min, and a press deflection curve is recorded. ) Refers to a synthetic resin foam molded article having a bending deflection of 20 mm or more measured according to) and a pressing force of 2 to 100 N at the time of 20 mm deflection. Specifically, it refers to foamed polypropylene, foamed polyethylene, other polyolefin resin foams, modified polystyrene resin foams, and the like. The synthetic resin foam includes a bead foam molded body, and examples of the bead foam molded body include a polypropylene-based bead foam molded body and a polyethylene-based bead foam.

In the specific selection of the material, both ends of a bar-like or flat plate-like test piece having a length of about 400 mm are supported, the center is pushed back and forth by about 25 mm and held for 30 minutes, and then the pressure is released, and then recovery from the deformation of the sample occurs. 90% or more is desirable. Alternatively, in accordance with a test performed with a conventional urethane foam cushion, the center portion of the sample supporting both ends is repeatedly pressed down and deformed a predetermined number of times, and the residual strain (also referred to as residual displacement) measured thereafter is determined. It is desirable to be below the fixed amount.

Such materials satisfying, for example, the density of the foamed polypropylene ^{0.06g / cm 3 ~0.015g / cm 3} , more preferably a density 0.035g ^/ cm ³ ~0.015g ^/ cm 3 or polyethylene foam, such as density 0.08g ^/ cm ³ ~0.03g ^/ cm 3 are preferred. On the other hand, rigid foamed urethane, polystyrene foam and the like which are poor in flexibility and can be easily broken by bending deformation are not preferable.

The inventors have studied materials in order to reduce the weight. As an example of a material that can be changed to urethane foam that has an open cell structure, synthetic resin foam that has a closed cell structure is generally lighter, more rigid, and more recyclable than urethane foam that has been commonly used as a cushioning material. Although it had the advantage of being easy, etc., when using bending and restoring force in the compression direction as a cushion, the reaction force tends to increase rapidly with the deformation of the foam due to the repulsive force of the air included It was inferior in comfort because it felt stiff and lacked cushioning.

In general, when a synthetic resin foam having a closed cell structure is used as a cushioning material by being bent in the compression direction like a urethane foam, it gradually loses its recovery force and generates creep as it is used for a long period of time. This is largely due to fatigue due to repeated deformation of the resin film constituting the bubbles and a drop in the pressure of the air contained therein. Therefore, it was not preferable as a material for a cushion used for a long time.

Therefore, the inventors analyzed the physical properties of the synthetic resin foam from various angles, so that it is not a structure that has been bent in the compression direction that has been used as a conventional general cushioning material, but can be bent and deformed. The present inventors have found that a method of utilizing the bending deformation and recoverability of a support made of a synthetic resin foam excellent in the above as a cushioning material is optimal.

In order to solve the problem described in “Problems to be Solved by the Invention”, the cushion body 1 according to claim 1 has a bending deflection amount of 20 mm or more measured according to the method described in JIS K7221-2: 2006. And a support 2 in the form of a plurality of rods 10 or a plurality of plates 11 which is made of a synthetic resin foam having a pressure of 20 to 100 mm and is bent and deformed under the load of a seated person or a supine person, and the support. An elastic body that is disposed on the back side of the body 2 and is capable of bending deformation of the support body 2 and has a damping property by compressive deformation with respect to the bending deformation of the support body 2 caused by a load of a seated person or a supine person 4.

The cushion body 1 according to claim 2 is characterized in that, in claim 1, the elastic body 4 is disposed between the support body 2 and a back body 30 that forms the back surface of the cushion body 1. To do.

The cushion body 1 according to claim 3 is characterized in that, in claim 1 or 2, the elastic body has a hardness at 20% compression of 20 to 600 N as defined in JIS K6400-2: 2012. To do.

The cushion body 1 according to a fourth aspect is the cushion body 1 according to the first or third aspect, wherein the support body 2 has a multilayer structure, and at least the back surface side of the first support body 2 on the side where a seated person or a supine person is in contact The elastic body 4 is provided.

A cushion body 1 according to a fifth aspect is characterized in that, in any one of the first to fourth aspects, the elastic body 4 is a columnar body.

A cushion body 1 according to a sixth aspect is characterized in that, in any one of the first to fifth aspects, a synthetic resin foam 20 is contained in the elastic body 4.

The cushion body 1 according to a seventh aspect is characterized in that, in any one of the first to sixth aspects, a hole 21 and a cavity 22 are provided in the elastic body 4.

A cushion body 1 according to an eighth aspect is characterized in that, in any one of the first to seventh aspects, an elastic body 4 is provided so as to cover the surface of the support body 2.

According to a ninth aspect of the present invention, the cushion body 1 according to any one of the first to eighth aspects is arranged on the back surface side of the support body 2 from the gaps 12 provided between the plurality of rod-shaped or flat plate-shaped support bodies 2. The provided elastic body 4 is protruded from the surface of the support 2.

The invention of the cushion body 1 described in claim 1 can replace the urethane foam that has been conventionally used in general with a synthetic resin foam, so that weight reduction and improvement in recyclability can be achieved. It is possible. Despite the use of synthetic resin foam, which is relatively hard and inferior to cushioning, fit, and creep resistance, it is possible to give high cushioning and fit, and freedom of design High degree of merchandise that can properly support the body of a seated person or a supine person and obtain high comfort, and exhibits excellent creep resistance equivalent to conventional urethane foam even when used for a long time. It has the effect of having.

Further, the elastic body 4 that is compressible and has a damping property against the bending deformation of the support body 2 due to the load of the seated person or the supine person is disposed in the bending deformation area of the support body 2. By this, the bending deformation which arises in the support body 2 can be attenuate | damped, and cushioning properties can be improved. In addition, durability against shocks caused by, for example, jumping of children and impacts when heavy objects are dropped on the support 2 can be improved, and even when a high-speed and heavy load impact is applied to an unspecified position. Since the elastic body 4 is supported on the back surface of the support 2, breakage of the support 2 made of the synthetic resin foam can be effectively prevented.

The invention described in claim 2 has the same effect as that of the invention described in claim 1, and the elastic body 4 is supported by the rigid back body 30, so that the elastic body 4 is more reliably compressed and deformed. Has the effect of becoming. In addition, since the cushion body 1 is composed of a synthetic resin foam on the front side and an elastic body 4 on the back side, the thickness of the synthetic resin foam is reduced even at a portion other than the support body 2 in the cushion body 1. Moreover, the elastic body 4 has a damping property and can be compressed and deformed so that the cushioning property can be enhanced, and the synthetic resin foam can be effectively prevented from being broken due to excessive bending deformation or the like. it can.

The invention according to claim 3 has the same effect as that of the invention according to claim 1 or 2, and further, the elastic body 4 to be used has a compression hardness and a damping property suitable as a cushion material of the cushion body 1, It can be set as the elastic body 4 which has the restoring | restoration property from a compressive deformation.

The invention described in claim 4 has the same effect as that of the invention described in either claim 1 or 3, and is on the back surface side of the first support 2 on the side where the seated person or the supine person contacts. Further, since the arrangement range is narrowly limited between the multi-layered supports 2 and the elastic body 4 having high compressibility and high resilience is disposed but heavy, the volume of the elastic body 4 is reduced and the cushion is reduced. The weight of the body 1 can be reduced.

The invention described in claim 5 has the same effect as that of the invention described in claim 1, 3 or 4, and the elastic body 4 is a columnar body, whereby the back surface of the support body 2 and the back surface of the cushion body 1 are provided. Since a space can be formed in a part between the back body 30 to be formed, the volume of the elastic body 4 can be reduced and further weight reduction can be achieved.

The invention according to claim 6 has the same effect as the invention according to any one of claims 1 to 5, and further, since the synthetic resin foam 20 is inherent in the elastic body 4, a seated person or a supine person When the weight applied to the support 2 changes due to the difference in body weight, etc., the cushioning property can be changed step by step, or the hardness can be partially changed only at necessary places such as the waist and buttocks. Play.

The invention according to claim 7 has the same effect as the invention according to any one of claims 1 to 6, and the cushioning property of the elastic body 4 is more finely provided by providing the elastic body 4 with the hole 21 and the cavity 22. There is an effect of partially adjusting the air permeability and improving the air permeability.

The invention according to claim 8 has the same effect as the invention according to any one of claims 1 to 7, and can further enhance the cushioning property at the moment when the seated person or the supine person sits or lies. Play.

The invention according to claim 9 has the same effect as the invention according to any one of claims 1 to 8, and further, a step generated between the rod-like or plate-like supports 2 with respect to a seated person or a supine person. This has the effect of alleviating the uncomfortable feeling of feeling the unevenness of the corners.

It is a schematic diagram of a cushion body provided with a rod-shaped support, a leg, and a back body. It is a schematic diagram of a cushion body provided with a flat support body, a leg body, and a back body. It is BB sectional drawing of FIG. 1, (a) shows the state at the time of no load, (b) is the figure which showed the state which carried out the bending deformation at the time of load. It is sectional drawing of the form which contacted the elastic body partially on the back surface of the support body, (a) is BB sectional drawing of FIG. 1, (b) is AA sectional drawing of FIG. It is a figure in case an elastic body is a columnar body, (a) is a perspective view, (b) is CC sectional drawing in case a support body and an elastic body contact | connect, (c) is a support body and an elastic body. It is DD sectional drawing at the time of changing a space | gap according to a site | part, (d) is DD sectional drawing when a support body and an elastic body are stuck. FIG. 4 is a diagram in the case where the support has a multi-layer structure and a rectangular frame shape, where (a) is a perspective view and (b) is an EE sectional view. FIG. 7 is a diagram in the case where the support has a multi-layer structure, where (a) is a perspective view, and (b) is a diagram in which a single type of elastic body is disposed between the front-side support and the back-side support. It is FF sectional drawing of a), (c) is FF sectional drawing of Fig.7 (a) at the time of arrange | positioning multiple types of elastic bodies between the surface side support body and the back surface side support body. It is BB sectional drawing of FIG. 1 of the form which made the synthetic resin foam exist in an elastic body. FIG. 3 is a cross-sectional view taken along the line B-B of FIG. 1 in which holes and cavities are provided in an elastic body, where (a) is a cross-sectional view provided with holes and (b) is a cross-sectional view provided with cavities. It is BB sectional drawing of FIG. 1 of the form which covered the thin elastic body on the surface of the support body. It is a perspective view which shows the example of the member which supports the back surface of a cushion body, (a) is a figure in case a back surface body consists of a spring, a wire, etc., when a back surface body is a backplate. It is the figure which the elastic body protrudes in the surface side of a support body, (a) is a perspective view of a cushion body, (b) is GG sectional drawing in (a).

Hereinafter, embodiments of the cushion body 1 according to the present invention will be described.

The cushion body 1 according to the present invention is used when a person is seated or lying on the back, such as a vehicle, a ship, a seat for a vehicle such as an airplane, a sofa, a chair, a cushion, a bed, a sleeper, a mattress, a mattress, a pillow, a mat, and the like. Moreover, it can be set as the component as a cushion.

As shown in FIGS. 1 and 2, the cushion body 1 according to the present invention has a bending deflection amount measured in accordance with the method described in JIS K7221-2: 2006 of 20 mm or more, and a pressing force at the time of 20 mm deflection is 2 to 100 N. A plurality of rod-like 10 or a plurality of flat-plate-like support bodies 2 that are bent and deformed under the load of a seated person or a supine person, and disposed on the back side of the support body 2. And an elastic body 4 which is capable of bending deformation of the support body 2 and has a damping property by compressing and deforming the bending deformation of the support body 2 due to a load of a seated person or a supine person. Moreover, the back body 30 is provided as shown in FIG. The back body is provided on a member 32 that supports the back surface of the cushion body 1 shown in FIG. 11. For example, the back plate as shown in FIG. 11A or the frame 31 as shown in FIG. 11B. It means a wire, a spring, or the like that is stretched between the elastic body 4 and the elastic body 4 that supports the elastic body 4 from the back side of the cushion body 1.

The back plate is made of a material made of a synthetic resin, a metal plate, or a composite material thereof, has rigidity, and is a wall presence when the elastic body 4 is compressed and deformed. The frame 31 is made of a material made of synthetic resin, metal, or a composite material thereof, and has rigidity.

  Since the cushion body 1 of the present invention uses the synthetic resin foam which is the material of the support body 2 of the present invention, the structure of the support body 2 and the leg body 3 is substantially gate-shaped as shown in FIG. 1 or FIG. From the state of the support body 2 shown in FIG. 3 (a), from a synthetic resin foam as shown in FIG. 3 (b), depending on the load at the time of sitting or lying on the person. When the support body 2 is bent and deformed, the cushion body 1 according to the present invention can make a seated person or a supine person feel high sitting comfort or high sleeping comfort.

First, the support 2 will be described. The support 2 is made of a synthetic resin foam, and is bent and deformed by a load 9 caused by a person sitting or lying on the back. As the form of the support 2, there are a form of a plurality of flat plates 11 as shown in FIG. 2, a form of a plurality of bars 10 as shown in FIG. 1, and a form of a multilayer structure 6 as shown in FIG. 7. . In the case of the form of a plurality of rods 10 or a plurality of flat plates 11, gaps 12 are provided between the supports 2. The support 2 may be in any form that can be bent and deformed by a load.

Regardless of the form of the support 2, the surface on which the seated person or the supine person abuts is the support 2 made of a synthetic resin foam, and is compressed and deformed into a region of the support 2 on the side to be bent. The elastic body 4 that easily attenuates the load is disposed.

Examples of the elastic body 4 include urethane foam, foamed resin molded body, foamed resin particles, foamed rubber, elastomer, fibrous material, three-dimensional knitted fabric, wool, silk, cotton, and fiber joints such as a three-dimensional spring structure. It consists of a material that has resilience to repeated loads, such as stretchable bags or spheres sealed with gas, and a material that has damping properties, such as fibers and rubber. It is a pressure plate of a flat disk having a diameter of 200 mm as defined in JIS K6400-2: 2012 regarding the method for determining the thickness, and it has a hardness at 25% compression (D method) of preferably 20 to 600N. Depending on the shape and size of the elastic body 4, the hardness at which the damping property is optimal is set. If it is less than 20N, it is too soft and the reaction force to return to its original form after being compressed is too weak to have damping. If it exceeds 600N, it is too hard when a load is applied and it is compressed and deformed. Does not have attenuating property.

As shown in FIG. 3A, the elastic body 4 is formed between the back surface of the support body 2 and the back body 30 that is a component of the member 32 that supports the back surface of the cushion body 1. Of the support 2 as shown in FIG. 4 (a) or partially in contact with the back of the support 2 as shown in FIG. 4 (b). There is a form in which the elastic body 4 is disposed with a predetermined gap.

Next, as shown in FIG. 5, there is a form in which the columnar elastic body 4 is disposed on the bending deformation side of the gate-shaped support body 2. In this case, the form in which the surface of the elastic body 4 is in contact with the back surface of the support 2 as shown in FIG. 5 (d), or the back surface of the support 2 and the surface of the elastic body 4 as shown in FIG. 5 (c). There is a form in which the gap is changed depending on the part of the support 2. As the gap is increased, immediately after the seated person is seated, only the bending deformation of the support body 2 is performed, and then the compression deformation of the elastic body 4 is applied. The elastic body 4 is disposed in close contact with the portion to be submerged.

Next, regarding the form of the multilayer structure 6 in which the support body 2 is composed of the support body 2 on the front surface side 7 and the support body 2 on the back surface side 8, the support body 2 on the side where the seated person or the supine person contacts the elastic body 4. It arrange | positions only on the back surface side of the 1st layer. As an arrangement form thereof, as shown in FIG. 6 (a) or (b), there is a form in which the columnar elastic bodies 4 are arranged in a range surrounded by the support body 2 having a rectangular frame shape. In this case, a back body 30 is disposed on the lower back side 8 of the lower layer.

Further, as shown in FIG. 7, there is a form in which the legs 3 extend from both ends of the support 2 of the multilayer structure 6. A space 5 is formed on the back side 8 in the multilayer structure 6 composed of the support 2 on the front side 7 and the support 2 on the back side 8. And as a form of the elastic body 4 arrange | positioned only on the back surface side of the 1st layer of the support body 2 by the side where a seated person or a supine person contacts, as shown in FIG.7 (b), the support body 2 of the surface side 7 and A configuration in which the elastic body 4 is disposed between the support bodies 2 on the back surface side 8, and can be expanded and contracted with gas sealed between the support body 2 on the front surface side 7 and the support body 2 on the back surface side 8 as shown in FIG. For example, a bag-like body 14 made of a simple material or a plate-like elastic body 4 may be disposed.

Further, as shown in FIG. 8, the synthetic resin foam 20 may be included in the elastic body 4. Even in the case of this configuration, the entire elastic body 4 including the synthetic resin foam 20 is made to have a hardness at 20% compression of 20 to 600 N. The internal synthetic resin foam 20 may have any form such as a columnar shape, a spherical shape, a cubic shape, a rectangular parallelepiped shape, and a conical shape. What is necessary is just to provide suitably the form of the said synthetic resin foam 20 made to exist, a position, a number, and a magnitude | size so that comfortable cushioning properties may be obtained according to the form and magnitude | size of the elastic body 4. FIG. The hardness can be partially adjusted by the internal synthetic resin foam 20.

Regardless of the form of the support body 2 and the elastic body 4, the elastic body 4 having a damping property is disposed on the side of the support body 2 that is bent and deformed. Is supported by the bending deformation of the support body 2 and the compression deformation of the elastic body 4, thereby exhibiting higher followability and cushioning properties against acceleration applied to the body of the seated person or the supine person, and the cushion body 1. The elastic body 4 can prevent the support body 2 made of the synthetic resin foam from being damaged even when a heavy object collides with an unspecified position.

Further, a hole 21 is provided in the elastic body 4 as shown in FIG. 9A, or a cavity 22 is provided as shown in FIG. 9B. The hole 21 may be a through hole or a hole that does not penetrate. By providing the holes 21 and the cavities 22 in the elastic body 4, the cushioning property of the elastic body 4 can be partially adjusted or the air permeability can be improved.

Next, as shown in FIG. 10, a layer made of the elastic body 4 is formed on the surface side of the support 2. In the case of this form, since the seated person or the supine person first contacts the elastic body 4 having a damping property at the moment of contact with the cushion body 1, when the hardness of the elastic body 4 is preferably 20N to 250N, You can feel the soft cushioning from the moment you touch.

Next, as shown in FIG. 12 (a) or (b), there is a form in which the elastic body 4 is disposed in the gap 12 between the supports 2 and the elastic body 4 is further protruded from the surface of the support 2. . In this case, it becomes difficult for the seated person or the supine person to feel the corners of the rod-like or plate-like support 2 as an uncomfortable feeling.

Next, the synthetic resin foam will be described. The synthetic resin foam in the present invention is flexible, can be bent and deformed, and has excellent restorability. The method described in JIS K7221-2: 2006 (23 ° C. ± 2 ° C., relative humidity 50 ± 5% A test piece having a length of 350 mm, a width of 100 mm, and a thickness of 25 mm, with the skin removed, is loaded up to a maximum of 90 mm at a distance between fulcrums of 6 and a test speed of 20 ± 1 mm / min, and a load deflection curve is recorded. ) Refers to a synthetic resin foam molded article having a bending deflection of 20 mm or more and a load of 2 to 100 N when bent by 20 mm. A synthetic resin foam molded article that causes fracture when the bending deflection is less than 20 mm is not suitable from the viewpoint of durability. When the cross section of the support body 2 required to support the pressing by the body becomes very large and the load when bending 20 mm is less than 2N or more than 100N, a preferable amount of bending is generated by the load applied by the seated person or the supine person Both of them are difficult to design, and preferable design is difficult. Specifically, it refers to foamed polypropylene, foamed polyethylene, other polyolefin resin foams, modified polystyrene resin foams, and the like. Among the foams, an in-mold molded body of resin foam particles is preferable from the viewpoint of shape flexibility (designability) considering a fit.

The polyolefin resin constituting the expanded particles used in the present invention is a polyolefin resin having an olefin component unit as a main component, specifically, a polypropylene resin, a polyethylene resin, and a mixture of two or more thereof. Is mentioned. The above-mentioned “main component” means that the olefin component unit is contained in the polyolefin resin in an amount of 50% by weight or more, and the content thereof is preferably 75% by weight or more, more preferably 85% by weight. % Or more, more preferably 90% by weight or more.

Examples of the polypropylene-based resin include resins having a propylene component unit of 50% by weight or more, and examples thereof include a propylene homopolymer or a copolymer with another olefin copolymerizable with propylene. Examples of other olefins copolymerizable with propylene include ethylene, 1-butene, isobutylene, 1-pentene, 3-methyl-1-butene, 1-hexene, 3,4-dimethyl-1-butene, 1 Examples thereof include α-olefins having 4 to 10 carbon atoms such as heptene and 3-methyl-1-hexene. The copolymer may be a random copolymer or a block copolymer, and may be not only a binary copolymer but also a ternary copolymer. The other olefin copolymerizable with propylene in the copolymer is preferably contained in a proportion of 25% by weight or less, particularly 15% by weight or less, and the lower limit is 0.3% by weight. Preferably there is. These polypropylene resins can be used alone or in combination of two or more. Polypropylene resin has a tensile elastic modulus (E) specified in JIS K7161: 1994 (test piece: JIS K 7162 (1994), test piece 1A type (direct molding by injection molding), test speed: 1 mm / min)). A resin foam obtained by foaming a base resin having a value of 600 MPa or more is preferable.

Examples of the polyethylene resin include resins having an ethylene component unit of 50% by weight or more, such as high density polyethylene, low density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-propylene copolymer. A copolymer, an ethylene-propylene-butene 1 copolymer, an ethylene-butene 1 copolymer, an ethylene-hexene 1 copolymer, an ethylene-4 methylpentene 1 copolymer, an ethylene-octene 1 copolymer, and the like. The mixture of 2 or more types is mentioned.

And in concrete selection of the synthetic resin foam, both ends of a rod-shaped test piece having a length of about 400 mm are supported, the center is pushed back and forth by 25 mm and held for 30 minutes, and then the pressure is released and then the sample is deformed. Residual strain measured after the center portion of the sample that supported both ends was repeatedly pressed down and deformed in accordance with tests performed on materials with 90% or more recovery or conventional urethane foam seat cushions. A material in which is less than a predetermined amount is desirable. The predetermined number or the predetermined amount conforms to a specification arbitrarily determined by each manufacturer when selecting a conventional material.

Such materials satisfying, for example, the density of the foamed polypropylene ^{0.06g / cm 3 ~0.015g / cm 3} , more preferably a density ^{0.035g / cm 3 ~0.015g / cm 3} , or of foamed polyethylene such as density 0.08g ^/ cm ³ ~0.03g ^/ cm 3 are preferred. Such a material is obtained by the method described in JIS K7221-2: 2006 (a test piece having a length of 350 mm, a width of 100 mm, and a thickness of 25 mm with the skin removed in an atmosphere of 23 ° C. ± 2 ° C. and a relative humidity of 50 ± 5%. In a test conducted in accordance with a distance of 300 mm at the fulcrum 6 and a load of up to 90 mm at a test speed of 20 ± 1 mm / min and recording a load deflection curve), the load when the bending deflection is 20 mm is 2 to 100 N and The flexible urethane foam, which is generally used for flexibility and flexural rigidity, on the other hand, has a load of 0.46 N when the bending deflection is 20 mm, and the bending rigidity is greatly inferior. It is not suitable as a material constituting 1.

  Below, the creep property and bending rigidity at the time of using a synthetic resin foam are demonstrated. First, in order to evaluate the creep property, compression set according to JIS K 6767: 1999 was measured. A test piece having a length of 50 mm, a width of 50 mm, and a thickness of 25 mm is compressed into a 25% distorted state and left at a temperature of 23 ° C. ± 2 ° C. for 22 hours. The thickness is measured 24 hours after the end of compression. The compression set was determined by compression set (%) = (test piece original thickness (mm) −thickness 24 mm after completion of compression (mm)) ÷ test piece original thickness (mm) × 100.

As a result of the test, the compression set of the 45-fold polypropylene foam particle molded body was 11%. On the other hand, the compression set of the polyurethane foam by the same measuring method is 2% or less. This is because conventional urethane foam, which is generally used as a cushioning material for seat cushions, exhibits cushioning properties by compression deformation. If it is simply replaced with a synthetic resin foam, compression set is generated, and the original cushion It is shown that it is difficult to maintain the product and the commercial value is lowered.

DESCRIPTION OF SYMBOLS 1 Cushion body 2 Support body 3 Leg body 4 Elastic body 5 Space 6 Multi-layer structure 7 Surface side 8 Back surface side 9 Load 10 Rod shape 11 Flat plate shape 12 Gap 13 Column shape 14 Bag shape body 20 Synthetic resin foam 21 Hole 22 Cavity 30 Back surface Body 31 Frame 32 Member that supports the back

Claims (9)

Bending under the load of a seated person or a supine person consisting of a synthetic resin foam having a bending deflection amount measured in accordance with the method described in JIS K7221-2: 2006 of 20 mm or more and a pressure at the time of 20 mm deflection of 2 to 100 N A plurality of rod-shaped or plurality of flat-plate-shaped supports that are deformed;
An elastic body disposed on the back side of the support body, capable of bending deformation of the support body, and compressively deforming and attenuating against bending deformation of the support body due to a load of a seated person or a supine person; A cushion body comprising:   The cushion body according to claim 1, wherein the elastic body is disposed between the support body and a back body forming a back surface of the cushion body.   The cushion body according to claim 1 or 2, wherein the elastic body has a hardness at 25% compression of 20 to 600 N as defined in JIS K6400-2: 2012.   The cushion according to claim 1 or 3, wherein the support has a multi-layer structure, and the elastic body is disposed on the back side of the first support on the side where the seated person or the supine is in contact. body.   The cushion body according to any one of claims 1 to 4, wherein the elastic body is a columnar body.   The cushion body according to any one of claims 1 to 5, wherein a synthetic resin foam is contained in the elastic body.   The cushion body according to any one of claims 1 to 6, wherein a hole or a cavity is provided in the elastic body.   The cushion body according to any one of claims 1 to 7, wherein an elastic body is provided so as to cover a surface of the support body.   The elastic body disposed on the back side of the support body is protruded from the surface of the support body through gaps provided between a plurality of rod-like or flat plate-like support bodies. The cushion body according to any one of 8.

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