JP2017176539A - Elastic structure and manufacturing method of elastic structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic structure and a manufacturing method of the elastic structure capable of improving pressure dispersion performance for dispersing a pressure applied to an object and posture maintenance performance for maintaining a posture of the object, corresponding to the object.SOLUTION: An elastic structure comprises a body part 11 for supporting a user P, a first elasticity adjustment part 21, a second elasticity adjustment part 22, and a third elasticity adjustment part 23 which are provided in the body part 11. Each of the elasticity adjustment parts 21, 22, 23 is divided into a plurality of laminated cells 31 in a surface direction intersecting a load application direction F from the user P to the body part 11. In each laminated cell 31, a plurality of elastic bodies 33 having different moduli of elasticity are laminated in the load application direction F. The body part 11 has a trunk support part 15 provided at a position corresponding to a trunk Pa in a supine state of the user P, and a pillow installation part 13 on which a head Pb of the user P is placed. The trunk support part 15 is provided with the first elasticity adjustment part 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an elastic structure and a method for manufacturing the elastic structure.

2. Description of the Related Art Conventionally, bedding such as a mattress is known in which a shape, an elastic force, and the like are changed at each position according to a user's body pressure distribution.
Patent Document 1 below proposes a bedding having a shape adjusted by arranging elastic blocks throughout the frame and replacing them with blocks having different heights according to the sleeping posture. Further, Patent Document 2 below proposes a bedding provided with an elasticity distribution by replacing pieces with the same size but different elasticity. Further, Patent Document 3 below proposes adjusting the number of layers, layer thickness, layer characteristics, and the like in a mattress having a multilayer structure.

JP 2004-205231 A Japanese Patent Laid-Open No. 2006-140 JP 2013-212317 A

Zatsiorsky, V., Seluyanov, V., “The mass and inertia characteristics of the main segments of the human body”, Biomechanics, VIII-B (1983), pp. 1152-1159 A. Michiyoshi, Yu Kai, Yokoi Takashi, “Estimation of Body Part Inertial Characteristics of Japanese Athletes”, Biomechanism (11) (1992), pp. 23-33

However, the conventional elastic structure has the ability to disperse body pressure in the user's sleeping posture (hereinafter referred to as “pressure dispersion performance”) and the performance to maintain the user's posture (hereinafter referred to as “posture maintenance performance”). There is room for further improvement in terms of supporting users in a comfortable state.
Accordingly, the present invention has been made in view of the above circumstances, and improves pressure dispersion performance for dispersing the pressure applied to the object and posture maintenance performance for maintaining the attitude of the object corresponding to the object. It is an object of the present invention to provide an elastic structure and a method for manufacturing the elastic structure.

  In order to solve the above problems and achieve the object, an elastic structure according to the present invention includes a main body portion that supports an object, and an elastic adjustment portion provided in a part of the main body portion, The elastic adjustment unit is divided into a plurality of stacked cells in a plane direction intersecting the load application direction from the object with respect to the main body, and each stacked cell includes a plurality of elastic bodies having different elastic moduli. It is characterized by being laminated in the application direction.

According to the present invention, the elastic adjustment part is provided in a part of the main body part, and the elastic adjustment part is divided into a plurality of stacked cells, so that the elastic adjustment part is set to an appropriate range corresponding to the object. Thus, the elasticity at a position suitable for each part of the object in the main body can be easily adjusted.
In addition, since each laminated cell is configured by laminating a plurality of elastic bodies having different elastic moduli in the load application direction, the amount of deformation and reaction at each position of the elastic adjustment portion can be adjusted by adjusting the lamination ratio of each laminated cell. You can adjust the power.
Furthermore, it is possible to appropriately adjust the pressure applied to each part of the object or to appropriately deform the elastic adjustment unit so as to correspond to the posture of the object. Therefore, it is possible to provide an elastic structure capable of improving the pressure dispersion performance for dispersing the pressure applied to the object and the attitude maintenance performance for maintaining the attitude of the object corresponding to the object. .

  In addition, the main body part is a trunk support part provided at a position corresponding to the trunk in a state where the user as the object is supine, and the user is supine on the trunk support part. A pillow installation part on which a user's head is arranged, and the trunk support part is provided with the first elastic adjustment part.

  According to this invention, the pillow installation part is provided in the site | part by which a head is arrange | positioned in the state which the user laid on the trunk support part. Therefore, if the user lies on his / her head so as to place the head on the pillow installation part, the trunk is placed on the first elastic adjustment part of the trunk support part as it is. Therefore, the trunk can be arranged in the first elastic adjustment unit without the user being conscious, and the usability is good.

  Further, the main body has a foot placement portion on which the user's foot is placed on the opposite side of the pillow placement portion across the trunk support portion, and the pillow placement portion and the foot placement portion At least one of the above is provided with the second elastic adjustment portion.

  According to the present invention, since the second elastic adjustment unit is provided in at least one of the pillow installation unit and the foot placement unit, the amount and distribution of subsidence can be adjusted for the user's head and feet. Therefore, it is possible to appropriately adjust the inclination of the user's body and improve the sleeping comfort.

  Further, the load supported by each of the stacked cells is formed to be uniform.

  According to the present invention, since the load supported by each stacked cell is made as uniform as possible, variation in reaction force applied to each part of the user can be reduced. Thereby, since a local strong reaction force can be relieved and a contact area can be increased, the pressure dispersion | distribution performance which disperse | distributes the body pressure in a user's sleeping figure can be improved.

  In addition, the load supported by each stacked cell is a weight of a portion corresponding to the stacked cell in a user as the object.

  According to the present invention, since each stacked cell supports the weight of the part corresponding to the stacked cell in the user, each stacked cell can be deformed according to the body shape of each part in the user's sleeping form. Therefore, the body shape can be maintained and supported without difficulty, and the posture maintenance performance for maintaining the posture of the user in the sleeping state can be improved.

  Further, with respect to the axis set along the height direction of the user as the object in the supine state, the lamination ratio of the plurality of elastic bodies in each of the laminated cells arranged in the left and right symmetrical positions is mutually It is characterized by being substantially identical.

  According to the present invention, the stacking ratios of the stacked cells arranged at symmetrical positions with respect to the axis are substantially the same. Since the weight of each part of the user in the supine state is substantially bilaterally symmetric, the stacking ratio and arrangement of each stacked cell in each whole elastic adjustment part can be easily designed by the user's half body.

  In addition, a stacking ratio of the plurality of elastic bodies in each stacked cell is substantially the same in the shoulder width direction.

  According to the present invention, since the stacking ratio in each stacked cell is substantially the same in the shoulder width direction, even if the user turns over, the sleeping comfort is not impaired and the usability is good.

The elastic body includes a synthetic resin foam.
The synthetic resin foam is a urethane foam.

  According to the present invention, since the elastic body includes the synthetic resin foam, it is lightweight and easy to ensure cushioning properties. Furthermore, since the synthetic resin foam, in particular urethane foam, does not easily spread in the direction crossing the compression direction when compressed, it is possible to obtain elasticity as designed and easily achieve a desired distribution of elastic force.

  The main body includes a surface layer formed of an elastic body, and the surface layer is provided so as to overlap with the plurality of stacked cells arranged side by side.

  According to the present invention, since the surface layer is provided continuously over the end portions of the plurality of stacked cells, the arrayed stacked cells can be continuously and smoothly deformed, which is easy to use.

  The elastic structure described above is a mattress for bedding.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to improve easily the pressure dispersion | distribution performance which disperse | distributes the pressure loaded on a user, and the attitude | position maintenance performance which maintains the attitude | position of a target object, and can be applied suitably for a mattress.

  In order to solve the above problems and achieve the object, an elastic structure manufacturing method according to the present invention includes a main body part that supports an object, an elastic adjustment part provided in a part of the main body part, The elastic adjustment unit is divided into a plurality of stacked cells in a plane direction intersecting a load application direction from the object with respect to the main body, and each of the stacked cells has a plurality of elasticity having different elastic moduli. An elastic structure manufacturing method for manufacturing an elastic structure in which a body is stacked in the load application direction, wherein the layers are ratios of thicknesses in the load application direction of the respective elastic bodies included in the stacked cell A stack that acquires the stacked cell information from a stacked cell information storage medium in which stacked cell information in which a ratio, a deformation amount with respect to the load of the stacked cell, and a reaction force with respect to the load of the stacked cell are associated is stored. Cell information Corresponding to an acquisition step, a trunk shape information acquisition step of acquiring trunk shape information indicating a trunk shape of a user of the elastic structure, and the trunk of the user among the positions of the elastic structure For each of the plurality of stacked cells arranged at positions, the stacking ratio, the stacked cell information acquired in the stacked cell information acquiring step, and the trunk shape acquired in the trunk shape information acquiring step And a stacking ratio determining step that is determined based on the information.

  According to the present invention, the lamination ratio, which is the ratio of the thickness of each elastic body included in the laminated cell, in the load application direction, the deformation amount with respect to the load of the laminated cell, and the reaction force with respect to the load of the laminated cell are associated with each other. Since the stacking ratio of each of the plurality of stacked cells is determined based on the stacked cell information storage medium in which the stacked cell information is stored, an elastic structure that is comfortable for the user can be manufactured.

In the manufacturing method of the elastic structure described above, based on the trunk shape information acquired in the trunk shape information acquisition step, has a trunk weight estimation step of estimating the weight of the trunk of the user, In the stacking ratio determining step, the stacking ratio can be determined based on the weight of the trunk of the user estimated in the trunk weight estimation step.
According to the present invention, since the weight of the user's trunk is estimated and the lamination ratio is determined, an elastic structure that is comfortable for the user can be manufactured in consideration of the weight of the trunk of the user. .

In the elastic structure manufacturing method described above, the trunk weight estimation step can estimate the weight of the user's trunk based on the weight of the user.
According to the present invention, since the weight of the trunk is estimated based on the weight of the user, the weight of the trunk can be estimated based on the actual information (weight) of the user, which is comfortable for the user. Elastic structures can be produced.

In the above-described elastic structure manufacturing method, the stacking ratio determining step determines the stacking ratio based on reaction force distribution information indicating a reaction force distribution mode of the elastic structure according to the use of the elastic structure. It is possible to decide.
According to the present invention, since the lamination ratio is determined based on the reaction force distribution information indicating the reaction force distribution mode of the elastic structure according to the use of the elastic structure, the user can use the elastic structure according to the use of the elastic structure. An elastic structure that is comfortable to the user can be manufactured.

In the elastic structure manufacturing method described above, the elastic structure is a mattress of a bedding.
According to the present invention, a mattress that is comfortable for the user can be manufactured.

In the manufacturing method of the elastic structure described above, the stacking cell in which the stacking ratio, the deformation amount, and the reaction force are associated with each other by performing a simulation using a strain energy function representing a deformation behavior for the stacking cell. It is possible to have a stacked cell information acquisition step of acquiring cell information.
According to the present invention, it is possible to acquire suitable stacked cell information by performing simulation using a strain energy function representing a deformation behavior for the stacked cell.

According to the present invention, the elastic adjustment part is provided in a part of the main body part, and the elastic adjustment part is divided into a plurality of stacked cells, so that the elastic adjustment part is set to an appropriate range corresponding to the object. Thus, the elasticity at a position suitable for each part of the object in the main body can be easily adjusted.
In addition, since each laminated cell is configured by laminating a plurality of elastic bodies having different elastic moduli in the load application direction, the amount of deformation and reaction at each position of the elastic adjustment portion can be adjusted by adjusting the lamination ratio of each laminated cell. You can adjust the power.
Furthermore, it is possible to appropriately adjust the pressure applied to each part of the object or to appropriately deform the elastic adjustment unit so as to correspond to the posture of the object. Therefore, it is possible to provide an elastic structure capable of improving the pressure dispersion performance for dispersing the pressure applied to the object and the attitude maintenance performance for maintaining the attitude of the object corresponding to the object. .

According to the present invention, the lamination ratio, which is the ratio of the thickness of each elastic body included in the laminated cell, in the load application direction, the deformation amount with respect to the load of the laminated cell, and the reaction force with respect to the load of the laminated cell are associated with each other. Since the stacking ratio of each of the plurality of stacked cells is determined based on the stacked cell information storage medium in which the stacked cell information is stored, an elastic structure that is comfortable for the user can be manufactured.
According to the present invention, since the weight of the user's trunk is estimated and the lamination ratio is determined, an elastic structure that is comfortable for the user can be manufactured in consideration of the weight of the trunk of the user. .
According to the present invention, since the weight of the trunk is estimated based on the weight of the user, the weight of the trunk can be estimated based on the actual information (weight) of the user, which is comfortable for the user. Elastic structures can be produced.
According to the present invention, since the lamination ratio is determined based on the reaction force distribution information indicating the reaction force distribution mode of the elastic structure according to the use of the elastic structure, the user can use the elastic structure according to the use of the elastic structure. An elastic structure that is comfortable to the user can be manufactured.
According to the present invention, a mattress that is comfortable for the user can be manufactured.
According to the present invention, it is possible to acquire suitable stacked cell information by performing simulation using a strain energy function representing a deformation behavior for the stacked cell.

It is sectional drawing which matches and shows the mattress in the embodiment and the user of the supine state. It is a top view of the mattress in an embodiment. It is a perspective view of the lamination cell in an embodiment. It is a fragmentary perspective view of the elastic adjustment part in embodiment. It is sectional drawing which shows the state which supported the trunk | body in the trunk | body support part in embodiment. It is a top view of the mattress in another example. It is a figure which shows an example of the procedure of the process of the manufacturing method of the mattress in embodiment. It is a figure which shows an example of the procedure of the process of the manufacturing method of the mattress in embodiment. It is a figure which shows an example of the process sequence of the production method of the block matrix in embodiment. It is a figure which shows an example of a measurement attitude | position (side surface). It is a figure which shows an example of a measurement attitude | position (rear surface). It is a figure which shows an example of a human body model (front surface). It is a figure which shows an example of a human body model (side). It is a figure which shows an example of a human body model (trunk part 1/2). It is a figure which shows an example of the design object range. It is a figure which shows an example of the structure of a mattress. It is a figure which shows the example which has arrange | positioned the human body model on the upper surface of a mattress. It is a figure which shows an example of the sinking amount at the time of arrange | positioning the human body model on the upper surface of a mattress. It is a figure which shows the example arrange | positioned so that the back of a human body model (trunk part 1/2) may contact | connect the upper surface of a mattress (trunk part 1/2). It is a figure which shows the example of the center point of the upper end surface of each lamination cell. It is a figure for demonstrating derivation | leading-out of the deformation amount of a laminated cell. It is a figure which shows an example of the design result of the body pressure dispersion | distribution type mattress. It is a figure which shows an example of the body pressure distribution measurement result regarding the mattress of the body pressure dispersion | distribution type which concerns on embodiment. It is a figure which shows an example of the body pressure distribution measurement result regarding the mattress which concerns on a conventional product. It is a figure which shows the example of the comparison of the maximum body pressure of embodiment and a conventional product. It is a figure which shows the example of the comparison of the contact area of embodiment and a conventional product. It is a figure for demonstrating calculation of the weight of the human body concerning a lamination | stacking cell. It is a figure which shows an example of the design result of a posture maintenance type mattress. It is a figure for demonstrating modeling by 3D CAD. It is a figure which shows an example of the analysis result of a human body model. It is a figure which shows the example of the comparison of the stress which arises in an intervertebral disk with embodiment and a conventional product. It is a figure which shows an example of the reproduction result of a deformation | transformation behavior. It is a figure which shows an example of the block matrix which concerns on embodiment. It is a figure which shows an example of the structure of the mattress in another example.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
(Body pressure dispersion type mattress)
The elastic structure according to this embodiment is a mattress of a bedding, and the object supported by the elastic structure is a user of the mattress.
FIG. 1 is a cross-sectional view showing a mattress according to an embodiment and a user in a supine state, FIG. 2 is a plan view of the mattress, and FIG. 3 is a perspective view of a stacked cell. 4 is a partial perspective view of the elastic adjustment portion, and FIG. 5 is a cross-sectional view showing a state in which the trunk is supported by the trunk support portion.

As shown in FIGS. 1 and 2, the mattress 10 includes a main body 11 for supporting the user P. The main body 11 is composed of an elastic member as a whole.
A trunk support portion 15, a pillow installation portion 13, and a foot placement portion 17 are provided on the main body portion 11 along the axis L. The axis L is set as a straight line extending along the height direction when the user P lies on the mattress 10.

The trunk support unit 15 is provided at a position corresponding to the trunk Pa of the user P in a state of being laid on the mattress 10.
The pillow installation part 13 is provided at a position corresponding to a part where the head Pb of the user P is placed in a state of being laid on the trunk support part 15. A pillow may be arranged in the pillow installation unit 13, but here, a pillow may be provided integrally with the main body unit 11.
The foot placement unit 17 is provided on the opposite side of the pillow installation unit 13 with the trunk support unit 15 interposed therebetween. The foot placement portion 17 is provided at a position corresponding to a portion where the foot portion Pc of the user P is placed in a supine state.

The trunk support portion 15 includes a first elastic adjustment portion 21 surrounded by the surrounding main body portion 11. The pillow installation unit 13 includes a second elastic adjustment unit 22 surrounded by the surrounding main body unit 11. The foot placement portion 17 includes a third elastic adjustment portion 23 surrounded by the surrounding main body portion 11.
The parts of the main body part 11 excluding the pillow installation part 13, the trunk support part 15 and the foot placement part 17 are formed in a substantially constant distribution of elastic force. Unlike the main body 11, the first elastic adjustment unit 21, the second elastic adjustment unit 22, and the third elastic adjustment unit 23 are formed in a desired elastic force distribution.

The first elastic adjustment unit 21, the second elastic adjustment unit 22, and the third elastic adjustment unit 23 are divided into a plurality of stacked cells 31 in a plane direction that intersects the load application direction F to the main body 11. Yes.
As shown in FIG. 3, in the stacked cell 31, a plurality of elastic bodies 33 having different elastic moduli are stacked in the load application direction F. The stacked cell 31 is formed in a quadrangular prism shape having a square in plan view. The stacked cell 31 may be formed in a quadrangular prism shape having a rectangle in plan view.

The plurality of elastic bodies 33 constituting the stacked cell 31 are each formed of a material that is compressed in the load application direction F and is elastically deformable, and has different elastic characteristics. The elastic bodies 33 adjacent to each other in the load application direction F are in close contact with each other.
The elastic body 33 preferably includes a synthetic resin foam such as urethane foam.

In the present embodiment, each elastic body 33 is made of urethane foam. Using the first urethane 33a and the second urethane 33b having different hardnesses, the elastic body 33 made of the first urethane 33a and the elastic body 33 made of the second urethane 33b can obtain desired elastic characteristics. Are combined. The elastic body 33 may be various types of urethane. In FIG. 3 and FIG. 4, each laminated cell 31 is configured by combining an elastic body 33 made of a first urethane 33a and an elastic body 33 made of a second urethane 33b. For example, the first urethane 33a is disposed closer to the user P than the second urethane 33b.
Here, in this embodiment, the hardness of the first urethane is lower (that is, softer) than the hardness of the second urethane.
Specifically, low-resilience urethane is used as the type of the first urethane 33a. Further, as the type of the second urethane 33b, high-resilience urethane or semi-rigid urethane is used.
In this embodiment, the words low-rebound urethane, high-repulsion urethane, and semi-rigid urethane, among these three, low-rebound urethane has the lowest hardness (that is, the softest), and high-repulsion urethane has a medium hardness. (That is, medium hardness), and semi-rigid urethane is used to mean the highest hardness (that is, the hardest). However, these terms are used for convenience of explanation, and are not limited to the terms. If the hardness is different between the first urethane and the second urethane, any name of urethane is used. May be.
The low-resilience urethane is a kind of soft urethane, for example, and has a property of slowly restoring when pressed (when compressed). The high resilience urethane is a kind of soft urethane, for example, and has a property of resilience like rubber. Semi-rigid urethane is, for example, an intermediate property between soft urethane and hard urethane. The hard urethane is, for example, a closed cell that does not have restorability. However, as described above, these names may not be clearly divided and are not limited to the names used in the present embodiment.

The plurality of laminated cells 31 constituting the first elastic adjustment section 21, the plurality of laminated cells 31 constituting the second elastic adjustment section 22, and the plurality of laminated cells 31 constituting the third elastic adjustment section 23 are mutually connected. It is formed in substantially the same shape, and the entire length in the load application direction F is also formed substantially the same.
Each laminated cell 31 realizes desired elastic characteristics by adjusting the type of elastic body 33 and the lamination ratio such as the ratio of the length in the load application direction F.

In the first elastic adjustment unit 21, the second elastic adjustment unit 22, and the third elastic adjustment unit 23, a plurality of stacked cells 31 are accommodated in a recess provided in the main body 11.
The plurality of stacked cells 31 of the first elastic adjusting unit 21, the second elastic adjusting unit 22, and the third elastic adjusting unit 23 are arranged in directions orthogonal to each other with the side surfaces of the adjacent stacked cells 31 in contact with each other. doing.

A surface layer 19 formed of an elastic body is provided above the plurality of stacked cells 31 arranged. The surface layer 19 is provided so as to overlap a plurality of stacked cells 31 constituting the first elastic adjustment unit 21, the second elastic adjustment unit 22, and the third elastic adjustment unit 23. The surface layer 19 of the present embodiment is continuously provided so as to constitute the entire top surface of the main body 11 of the mattress 10.
A surface layer 20 (may be referred to as a back layer) formed of an elastic body is provided below the plurality of stacked cells 31 arranged. The surface layer 20 is provided so as to overlap a plurality of stacked cells 31 constituting the first elastic adjustment unit 21, the second elastic adjustment unit 22, and the third elastic adjustment unit 23. The surface layer 20 of the present embodiment is continuously provided so as to constitute the entire lower surface of the main body 11 of the mattress 10.
As described above, in the present embodiment, the main body 11 is sandwiched between the upper and lower surfaces of the main body 11 of the mattress 10 by the surface layers 19 and 20.
In the present embodiment, the surface layer 19 and the surface layer 20 have the same thickness. However, as another configuration example, a configuration in which the thicknesses are different from each other may be used.

In the first elastic adjustment unit 21, the second elastic adjustment unit 22, and the third elastic adjustment unit 23, the elastic characteristics in the stacked cell 31 at each position are set according to the body shape, weight, etc. of the user P of the mattress 10. Has been.
As illustrated in FIG. 5, the first elastic adjustment unit 21, the second elastic adjustment unit 22, and the third elastic adjustment unit 23 are configured such that the stacked cells 31 corresponding to the respective portions of the user P in the supine state are elastic. The elastic characteristics are adjusted so as to deform and contact the user P with an appropriate body pressure.

  In the case of this embodiment, the type and the lamination ratio of the elastic body 33 of each laminated cell 31 are adjusted so that the load supported by each laminated cell 31 is substantially uniform. For example, the load at a predetermined site of the user P may be set to be supported by each stacked cell 31 evenly divided by the number of stacked cells 31 in contact with the predetermined site.

In the present embodiment, the types and stacking ratios of the plurality of elastic bodies 33 in the stacked cells 31 arranged at symmetrical positions with respect to the axis L are substantially the same. Further, the lamination ratio of the elastic bodies 33 in each laminated cell 31 is substantially the same in the shoulder width direction.
In the first elastic adjustment unit 21, the second elastic adjustment unit 22, and the third elastic adjustment unit 23, in order to set the elastic characteristics and arrangement of the stacked cells 31 so as to disperse the body pressure, for example, as described later It can be done by simple design.

According to the mattress 10 as described above, the elastic adjustment part is provided in a part of the main body part, and the elastic adjustment part is divided into a plurality of laminated cells, so that the elastic adjustment part is in an appropriate range corresponding to the object. By setting to, the elasticity of the position suitable for each part of the object in the main body can be easily adjusted.
In addition, since each laminated cell is configured by laminating a plurality of elastic bodies having different elastic moduli in the load application direction, the amount of deformation and reaction at each position of the elastic adjustment portion can be adjusted by adjusting the lamination ratio of each laminated cell. You can adjust the power.
Furthermore, it is possible to appropriately adjust the pressure applied to each part of the object or to appropriately deform the elastic adjustment unit so as to correspond to the posture of the object. Therefore, it is possible to provide an elastic structure capable of improving the pressure dispersion performance for dispersing the pressure applied to the object and the attitude maintenance performance for maintaining the attitude of the object corresponding to the object. .

  Moreover, according to this mattress 10, the pillow installation part 13 is provided in the site | part by which the head Pb is arrange | positioned in the state in which the user P laid down on the trunk support part 15. FIG. Therefore, if the user P lies on the pillow setting part 13 so as to place the head Pb, the trunk Pa is placed in the first elastic adjustment part 21 of the trunk support part 15 as it is. Therefore, the user P can arrange the trunk Pa in the first elastic adjustment unit 21 without being conscious of it, which is convenient.

  Further, according to the mattress 10, the second elastic adjustment unit 22 is provided in the pillow installation unit 13, and the third elastic adjustment unit 23 is provided in the foot placement unit 17. Therefore, the sinking amount and distribution can be adjusted for the head Pb and the foot Pc of the user P, and the user's P inclination and the like can be adjusted appropriately to improve sleeping comfort.

  Further, according to the mattress 10, the elastic characteristics of the elastic adjustment portions 21, 22, and 23 are adjusted so that the load supported by each stacked cell 31 is as uniform as possible. Therefore, it is possible to reduce variations in the reaction force applied to each part of the user P, to relieve the reception of a strong reaction force locally, and to make it easy to make contact with a wide range of the user's sleeping shape. Thereby, the performance which disperse | distributes the body pressure in the sleeping figure of the user P can be improved.

  Moreover, according to this mattress 10, the lamination | stacking ratio of each lamination cell 31 arrange | positioned in the left-right symmetrical position with respect to the axis line L is mutually substantially the same. Since the weight of each part of the user P in the supine state is generally substantially bilaterally symmetric, the stacking ratio and arrangement of the stacked cells 31 in the entire elastic adjustment units 21, 22, and 23 are determined based on the data of the user P's half body. Can be designed easily.

  Moreover, according to this mattress 10, the lamination | stacking ratio in each lamination cell 31 is substantially the same in the shoulder width direction. Therefore, even if the user P rolls over, the comfort is not impaired and the usability is good.

  Moreover, according to this mattress 10, since the elastic body 33 contains a synthetic resin foam product, it is lightweight and it is easy to ensure cushioning properties. Furthermore, since it is difficult to spread in a direction crossing the compression direction when compressed, the designed elasticity can be obtained, and a desired elastic force distribution can be easily realized.

  Further, according to the mattress 10, since the surface layers (in the present embodiment, the surface layer 19 and the surface layer 20) are provided continuously over the end portions of the plurality of stacked cells 31, the plurality of stacked stacked cells 31 arranged. Can be continuously and smoothly deformed, making it easy to use.

(Modified example: Posture maintenance type mattress)
Next, a modified example of the method for adjusting the type of elastic body 33 and the lamination ratio of each laminated cell 31 will be described.
In the above, in the 1st elastic adjustment part 21, the 2nd elastic adjustment part 22, and the 3rd elastic adjustment part 23, it adjusted so that the load supported by each laminated cell 31 might become as uniform as possible. On the other hand, in the modification of the embodiment, each stacked cell 31 is adjusted so as to maintain the posture of the user P.

That is, the type and the lamination ratio of the elastic body 33 of each laminated cell 31 are adjusted so that the load supported by each laminated cell 31 becomes the weight of the part corresponding to the laminated cell 31 in the user P. The weight of each part may be calculated from the density and thickness of the part corresponding to the stacked cell 31 in the user P, for example.
In order to set the elastic characteristics and arrangement of the stacked cells 31 so as to maintain the posture of the user P in the first elastic adjustment unit 21, the second elastic adjustment unit 22, and the third elastic adjustment unit 23, for example, This can be done as described below.

  According to the modification of the embodiment, each stacked cell 31 is configured to support the weight of a portion corresponding to the stacked cell 31 in the user P. Therefore, each stacked cell 31 can be deformed according to the shape of each part in the sleeping posture of the user P. Therefore, the body shape can be maintained and supported without difficulty, and the performance of maintaining the posture of the user P in the sleeping posture can be improved.

The technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the example of the mattress 10 has been described. However, the elastic structure of the present invention is also applied to a packing material for placing an object or protecting it by placing it around the object. Is possible.

  In the above description, the second elastic adjustment unit 22 is provided in the pillow installation unit 13 and the third elastic adjustment unit 23 is provided in the foot arrangement unit 17, but the pillow installation unit 13 and the foot arrangement unit 17 are the surrounding main body units. 11 may be formed so as to have the same elastic force distribution as in FIG. Furthermore, the second elastic adjustment unit 22 may be provided only on one of the pillow installation unit 13 or the foot placement unit 17.

In the above description, each stacked cell 31 has a square shape in plan view, but the shape of the stacked cell 31 can be changed as appropriate. For example, it may be formed in a strip shape that is long and continuous in a direction orthogonal to the axis L. Such a configuration example will be described with reference to FIG.
FIG. 6 is a plan view of a mattress in another example.
As shown in FIG. 6, the mattress 10 </ b> A includes a main body 11 </ b> A for supporting the user P. The main body portion 11A is provided with a trunk support portion 15A, a pillow placement portion 13A, and a foot placement portion 17A along the axis LA. The trunk support unit 15A includes a first elastic adjustment unit 21A, the pillow installation unit 13A includes a second elastic adjustment unit 22A, and the foot placement unit 17A includes a third elastic adjustment unit 23A. Yes. The first elastic adjustment unit 21A, the second elastic adjustment unit 22A, and the third elastic adjustment unit 23A are divided into a plurality of stacked cells 31A in a plane direction that intersects the load application direction F to the main body 11A. Yes.
Here, in the example of FIG. 6, as compared with the example of FIG. 2, each stacked cell 31A is formed in a strip shape that is long and continuous in a direction orthogonal to the axis LA, and one integrated in that direction. The point which is comprised as a thing is different and the other point is the same. The belt-like length may be arbitrary, and in the example of FIG. 6, the length reaches the both ends of the mattress 10A in the shoulder width direction. In the mattress 10A including such a strip-shaped laminated cell 31A, the position where the user P can sleep in the shoulder width direction (here, the position where the elastic adjustment portion exists under the user P) can be widened. In particular, the configuration including the strip-shaped laminated cell 31A that reaches both ends in the shoulder width direction can maximize the effect. In addition, when the user P lies on the mattress 10 </ b> A according to the example of FIG. 6, the state (cross section) viewed from the side is the same as FIG. 1.
2 and 6, the mattress 10 includes three elastic adjustment units (first elastic adjustment units 21 and 21A, second elastic adjustment units 22 and 22A, and third elastic adjustment units 23 and 23A). , 10A configuration example, as another configuration example, a mattress provided with only one arbitrary elastic adjustment portion (for example, only the first elastic adjustment portions 21 and 21A of the trunk), or any two A mattress with one elastic adjustment part or a mattress with four or more elastic adjustment parts may be designed and manufactured.
Furthermore, in the above description, the adjacent stacked cells 31 and 31A are arranged in contact with each other, but the adjacent stacked cells 31 and 31A may be arranged with a gap therebetween.

(Method for Producing Elastic Structure of Embodiment)
7 and 8 are diagrams illustrating an example of a processing procedure of the mattress manufacturing method according to the embodiment.
7 and 8, steps S1 to S23 are shown as the overall processing. Among these, the processes of the customer who orders the mattress are steps S1 and S23, and the processes of the manufacturer who manufactures the mattress are steps S2 to S16 and steps S18 to S22. Data for manufacturing the mattress is prepared, and this input data is used in step S17.

With reference to FIG. 7 and FIG. 8, an example of the procedure of the process of the manufacturing method of the mattress in the embodiment will be described.
The customer orders a mattress from the supplier (step S1).
The trader determines whether the order contents of the customer are appropriate (step S2). As a result, when the order content is not appropriate (step S2: NO), the trader inquires the customer about the order content (step S3). In this case, the trader confirms necessary customer information and confirms with the customer as necessary. Thereafter, the process proceeds to step S4.
If the order contents are appropriate (step S2: YES), or after inquiring about the order contents in step S3, the supplier inputs the orderer information (step S4). The input destination is, for example, a supplier's computer, and the orderer information is stored in the storage device via the computer.

Next, the trader adjusts the schedule of measurement (measurement) of the human body with the customer (step S5). Thereby, a contractor makes the schedule which implements measurement. This human body measurement is the measurement of the human body of the user of the mattress (the person who will use the mattress). The user may be the customer himself or another person.
Then, the trader measures the human body shape of the user on the adjusted schedule (step S6). Further, the trader measures the weight of the user (step S7). Thus, the trader acquires human body shape data (human body shape data) and weight data (weight data).
Here, in the example of FIG. 7, the trader measured the user in step S <b> 5 to step S <b> 7, but as another example, the customer provides measurement result data to the trader, and the trader acquires the data. May be.

The trader corrects the acquired human body shape data (step S8). Thereby, the trader creates a design model. Here, for example, a human body model of a part corresponding to the trunk (1/2 in the present embodiment) that is a design target part is generated.
Further, the trader calculates the weight of the trunk based on the corrected human body shape data and the acquired weight data (step S9). At this time, for example, conventionally known information on the human body weight distribution ratio may be used.

The trader sets the division number of the stacked cells (step S10). This number of divisions is set according to the height of the user, for example.
Further, the trader sets the amount of mattress sink (step S11).
Then, the contractor sets the deformation amount of each stacked cell based on the amount of mattress subtraction (step S12).

Next, whether the contractor uses a body pressure dispersion type design method or a posture maintenance type design method (this embodiment will be described as a modified example) based on confirmation of the design concept. Judging. This determination may be made based on, for example, the customer's wishes or the experience of the trader.
As a result, when the body pressure dispersion type design method is used (step S13: body pressure dispersion type), the contractor calculates the equivalent load value ( (Equal load value) is calculated (step S14). On the other hand, when the attitude maintenance type design method is used (step S13: attitude maintenance type), the trader calculates the load value of each stacked cell as a solution by calculating (the weight of the human body on the upper surface of each stacked cell). Calculate (step S15).

The trader determines whether or not the block matrix information covers the calculated load value and deformation amount (step S16). Here, the block matrix stores the relationship between the stacking ratio of the stacked cells, the deformation amount, and the reaction force. The block matrix is prepared in advance, for example.
As a result, when the load value and deformation amount calculated by the block matrix information are not covered (step S16: NO), the contractor creates a block matrix for the portion not covered (step S17). And it transfers to the process of step S16 again.
On the other hand, when the block matrix information covers the calculated load value and the deformation amount (step S16: YES), the contractor derives the stacking ratio in which the reaction force generated with the set deformation amount and the calculated load value are balanced. (Step S18).

Then, the supplier manufactures the mattress (Step S19). Thereafter, the trader inspects the mattress product (step S20). The trader determines whether or not the product is made according to the design dimensions (step S21). As a result, when the product is not made according to the design dimensions (step S21: NO), the trader moves again to the process of step S19 (production of mattress).
On the other hand, if the product is made as designed (step S21: YES), the product is packaged and shipped (step S22).
As a result, the product is delivered to the customer (step S23).

FIG. 9 is a diagram illustrating an example of a processing procedure of a block matrix creation method according to the embodiment.
Here, a case where a vendor creates a block matrix is shown, but the block matrix may be created by another person.
The creator starts creating a block matrix (step S101).
The creator selects and arranges materials (step S102). The creator processes the acquired material into a test piece shape (step S103). The test piece shape is, for example, a cylindrical shape or a dumbbell shape. The creator measures the dimensions of the test piece (step S104). The creator performs a compression test and a tensile test on the test piece (step S105).
Then, the creator derives an Ogden-foam strain energy function (step S106). Then, the creator performs a simulation using the derived strain energy function (step S107). Thereby, the accuracy with the actual experiment can be verified. Here, in this embodiment, as an example, approximation is performed using Ogden-foam. Moreover, in this embodiment, as an example, simulation is performed using a finite element method (FEM: Finite Element Method).

The creator determines whether or not the accuracy is within an allowable range (step S108).
As a result, when the accuracy is not within the allowable range (step S108: NO), the creator proceeds to the process of step S106 again.
On the other hand, when the accuracy is within the allowable range (step S108: YES), the creator creates a block matrix (step S109). Thereafter, the creation of the block matrix is terminated (step S110).

  Below, the manufacturing method of the mattress in the embodiment will be described in more detail.

<Examples of 3D shape measurement and weight measurement of user's body shape>
An example of the three-dimensional shape measurement of the user's body shape will be described.
The body shape of the user is measured using a three-dimensional scanner (3D scanner). The measuring device may be any device. As a result, polygon data representing the body shape of the user is acquired.
As an example, ask the user to change into clothing for measurement, explain the measurement from the viewpoint of safety to the user, measure the user's body shape using a 3D scanner, and measure the weight of the user. Measure the body pressure distribution of the user.
Based on the weight or body pressure distribution measured here, the weight of the design target part (in this embodiment, the trunk) is estimated and utilized for the design of the mattress. The information on the whole body model includes trunk shape information.

FIG. 10 is a diagram illustrating an example of a measurement posture (side surface).
FIG. 11 is a diagram illustrating an example of a measurement posture (rear surface).
The examples of FIGS. 10 and 11 are measurement postures when the human body 101 is in a resting position. In this example, as examples of measurement points, a mastoid process (apical appendage) 121, acromion 122, greater trochanter 123, patella posterior surface 124, 1-2 cm anterior 125 of the external fruit, occipital protuberance 126, vertebral spinous process 127, A crack 128 is shown.
A human body model (human body model) is generated using these data. Note that when the human body model is generated, marking may be performed on a cutting position (for example, a position for extracting the trunk) using the detected feature points.

<Other examples of 3D shape measurement of user's body shape>
Another example of measuring the three-dimensional shape of the user's body will be described.
A human body model (human body model) is constructed on the basis of X-ray CT (Computed Tomography) and MRI (Magnetic Resonance Imaging) images. As a result, a three-dimensional human body model having shape information of the internal tissue of the human body is generated. In addition, both CT and MRI may be performed, for example, or only arbitrary one may be performed. Further, the body shape of the user may be measured using a 3D scanner, and the result (polygon data representing the whole body shape) may be used.
In addition, when the human body model has already been constructed, the human body model may be used.
The information on the whole body model includes trunk shape information.

FIG. 12 is a diagram illustrating an example of the human body model 151 (front surface).
FIG. 13 is a diagram illustrating an example of the human body model 151 (side surface).
The human body model 151 is a whole body model and is polygon data.

FIG. 14 is a diagram illustrating an example of the human body model 171 (trunk part 1/2).
This human body model 171 is obtained by determining a design target range and deleting unnecessary portions. In the present embodiment, it is assumed that the trunk is bilaterally symmetric, and a half-part model is used.

<Determination of design range and weight>
Here, determination of the design target range and determination of its weight will be described.
FIG. 15 is a diagram illustrating an example of the design target range.
FIG. 15 shows a human body model 191. Position 201 and position 202 correspond to the right and left acetables, respectively. The distance (distance in the shoulder width direction) L1 between these two positions 201 and 202 is a multiple of the width of the stacked cell (50 mm in this embodiment) in this embodiment.
The position 221 corresponds to the seventh cervical vertebra, and the position 222 corresponds to a position at a predetermined distance from the seventh cervical vertebra. The predetermined distance (height direction distance) L2 is a multiple of the width of the stacked cell (50 mm in this embodiment) in this embodiment.
In addition, in this embodiment, although the case where the width | variety of all the laminated cells is the same (equal) is shown, the structure from which a width | variety may differ for every laminated cell may be used as another structural example, The distance L1 and the distance L2 are not necessarily a multiple of the width of one stacked cell. As another configuration example, a configuration in which the width of the stacked cell is different in the shoulder width direction and the height direction may be used.
Here, a rectangular internal range 241 is set as a design target range. This range 241 is the inside of a rectangle having four positions 201 to 202 and 221 to 222 as vertices. Then, the head is cut at the seventh cervical vertebra, and both arms are cut at the acromion (see, for example, Non-Patent Document 1).

In the first method of determining the weight of the design target part, the generated human body model is cut at the boundary between the range 242 and the range 243 (see, for example, Non-Patent Document 2). Together these two ranges 242-243 form a range 241.
For the male human body, the weight of the range 242 is regarded as 48.9% of the body weight, and for the female human body, the weight of the range 242 is regarded as 45.7% of the body weight (see Non-Patent Document 2, for example).
The range 243 is obtained by calculating the density from the volume obtained by cutting out the thigh from the user's whole body model and the weight of Non-Patent Document 2, and multiplying the volume of the range 243 (for example, see Non-Patent Document 2). ).
The total value of the weight in the range 242 and the weight in the range 243 is used as the weight of the design target part. In this embodiment, the estimation result of the weight of the trunk is used as the weight of the design target part.

  In the second method of determining the weight of the design target part, the weight of the trunk is estimated from the measurement result of the body pressure distribution that has been performed. That is, the ratio of the weight of the design target part (range 241) to the body weight obtained from the body pressure distribution measurement result is calculated, and it is estimated that the result of multiplying the measured body weight by this ratio is the weight of the design target part.

<Mattress design by body pressure dispersion method>
With reference to FIGS. 16 to 26, a mattress design by a body pressure dispersion type method will be described.
FIG. 16 is a diagram illustrating an example of a mattress structure.
In the example of FIG. 16, the planar structure 301 and the cross-sectional shape 302 of the mattress of the embodiment are shown. The design target part 321 is arranged at the center in the shoulder width direction of the mattress. In the design target portion 321, a plurality of stacked cells are arranged in a matrix. An elastic body 322a and an elastic body 322b are stacked for each stacked cell.

As an example, the mattress has a length L11 in the height direction of 2000 mm, a length L21 in the shoulder width direction of 1000 mm, and a thickness L23 of 100 mm. A distance L12 between the design target portion 321 and the head side end of the mattress is 400 mm. Each stacked cell is square when viewed in plan, and the length L31 of one side of the square is 50 mm. The thickness of each stacked cell is 100 mm. The design target part 321 has a length L13 in the height direction that is a multiple of 50 mm, and a length L22 in the shoulder width direction is 300 mm.
Here, the length L13 in the height direction of the design target portion 321 is the same length as the determined design target range (range 241 shown in FIG. 15).

  In each laminated cell, urethane is used as an elastic body. In each laminated cell, two types of low-resilience urethane, high-resilience urethane, and semi-rigid urethane are laminated, and the hardness characteristics are changed by changing the lamination ratio of the materials. In this embodiment, a combination of a low-resilience urethane and a high-resilience urethane, or a combination of a low-resilience urethane and a semi-rigid urethane is used. A low-resilience urethane is disposed on the upper surface side of the mattress, and a high-resilience urethane or semi-rigid urethane is disposed on the lower side (lower surface side of the mattress).

In designing the mattress, the back of the generated human body model is placed in contact with the upper surface of the mattress, and the amount of the human body (human body model) sinking into the mattress is determined.
FIG. 17 is a diagram illustrating an example in which a human body model is arranged on the upper surface of the mattress.
FIG. 17 shows a state in which the human body model 352 is not submerged in the mattress 351 and a state in which the human body model 372 is submerged in the mattress 371. Here, the reference numerals are changed for convenience of explanation, but the mattress 351 and the mattress 371 are the same, and the human body model 352 and the human body model 372 are the same. In the submerged state, the human body model 372 is moved in parallel to the mattress 371 by the amount of subsidence.
In FIG. 17, for convenience of explanation, each laminated cell constituting the mattress 351, 371 is shown as a model of a two-layer structure. However, this is a display for explanation and is not necessary for design. The cell structure has not been determined at this stage.

Based on the state in which the human body model 372 sinks into the mattress 371, the vertical distance (distance in the load application direction) from the bottom side surface center point of the mattress 371 to the human body (human body model 372) is measured for each stacked cell. For each stacked cell, a value obtained by subtracting the vertical distance from the thickness of the mattress 371 is set as the deformation amount of the stacked cell.
FIG. 18 is a diagram illustrating an example of the sinking amount when the human body model 372 is disposed on the upper surface of the mattress 371.
In the example of FIG. 18, the sinking amount (amount of parallel movement) of the human body model 372 with respect to the mattress 371 is set to a predetermined value L53 (60 mm in this example). Further, the distance L51 from the bottom surface of the mattress 371 (the bottom surface of each stacked cell) to the human body model 372 and the deformation amount L52 of each stacked cell are shown.

Here, with reference to FIGS. 19 to 21, a method for obtaining the deformation amount of each stacked cell will be described in more detail.
FIG. 19 is a diagram illustrating an example in which the back of the human body model 412 (trunk part 1/2) is in contact with the upper surface of the mattress 411 (trunk part 1/2). In this embodiment liquid, a half of the trunk is used. FIG. 19 shows a plurality of stacked cells 431.
Next, based on the information shown in FIG. 19, a point (center point) is generated at the center of the upper end surface (the upper surface of the mattress) of each stacked cell 431.
FIG. 20 is a diagram illustrating an example of the center point 432 of the upper end surface of each stacked cell 431. FIG. 20 shows an XYZ orthogonal coordinate system. The XY plane is provided on the upper end surface (the upper surface of the mattress) of the stacked cell 431, and the Z axis is an axis perpendicular to the upper end surface (the mattress thickness direction). In the example of FIG. 20, the direction from positive to negative of the Z axis is the load application direction.

FIG. 21 is a diagram for explaining the derivation of the deformation amount of the stacked cell 431.
FIG. 21 shows a mattress 411, a stacked cell 431, a human body model 412 before sinking (before parallel movement), and a distance γ _n [mm] from the upper surface of the mattress 411 to the human body model 412 (n is each stacked layer) Cell identification number), human body model 451 after sinking (after translation), generated center point 432, and a line passing through the center point 432 and perpendicular to the surface of the mattress 411 and the human body after sinking The intersections with the model 451 (points 491 and 492) and the amount by which the human body model 412 sinks into the mattress 411 (sink amount L71) are shown. The sinking amount L71 is the amount by which the stacked cell 431 sinks.

For each stacked cell 431, the distance γ _n in the Z-axis direction from the center point 432 to the human body model 412 before sinking is calculated. This calculation may be performed using an arbitrary function, and may be performed using, for example, Geologic Control.
The amount that the human body model 451 after sinking sinks into the mattress 411 (the sinking amount L71) is set to a predetermined value (60 mm in this embodiment). Then, the deformation amount (60−γ _n ) is calculated for each stacked cell 431.
The weight of the trunk to be designed is set to a calculated value (in this example, 21.9 kg). Note that an estimated value may be used instead of the calculated value (for example, see Non-Patent Documents 1 and 2). In this example, since it is a body pressure dispersion type, each laminated cell 431 bears an equal load. In this example, the number (total number) of stacked cells 431 in the trunk is 42, and in this case, each stacked cell 431 has a load (reaction force) of 0.521 kg (= 21.9 kg / 42 rounded off). Will be responsible).
Thereby, since the deformation amount and the reaction force are determined, the configuration of the urethane is determined by reading the block matrix 711. This result is applied to each elastic body of each stacked cell 431. Then, the mattress design is completed.

  Here, in this embodiment, the area of the upper end surface of each stacked cell 431 is an equal value (50 mm × 50 mm). For this reason, by supporting an equal load in each stacked cell 431, the surface pressure applied to the upper end surface of each stacked cell 431 becomes equal. At this time, as a load supported by one stacked cell 431, it is an ideal example to use a value obtained by dividing the weight of the human body of the design target part by the number (total number) of stacked cells 431.

Thus, when designing a body pressure dispersion type mattress, all the stacked cells are structured to support the same weight. In this case, the body pressure is averaged because all the stacked cells support the same weight. For this reason, a value obtained by dividing the weight of the design target part by the number (total number) of stacked cells (becomes a constant value for each design) is defined as a reaction force (supporting weight).
And about each laminated cell, based on the deformation | transformation amount of each elastic body, and reaction force (weight to support), the structure (lamination | stacking ratio) of required urethane is guide | induced using a block matrix.

Here, in this embodiment, a block matrix 711 shown in FIG. 33 is used. The block matrix 711 stores the correspondence of three parameters such as the urethane configuration of each stacked cell, the deformation amount of each elastic body, and the reaction force (supporting weight). Thus, once two of these three parameters are determined, the remaining one can be determined.
Details of generation of the block matrix 711 will be described later.

FIG. 22 is a diagram illustrating an example of a design result of a body pressure dispersion type mattress.
FIG. 22 shows a mattress structure 511 according to the design result. FIG. 22 shows X1-Y1 orthogonal coordinates for explanation, and the positive direction of the Y1 axis is the head side of the human body.
In the example of FIG. 22, the mattress structure 511 includes a plurality (= 6 × 14) of stacked cells, and has a pattern of a high resilience-low resilience stacked cell 531 and a semi-rigid-low resilience stacked cell 532. They are shown separately.
The high repulsion-low repulsion laminated cell 531 is configured by combining a high repulsion urethane and a low repulsion urethane.
The semi-rigid-low repulsion laminated cell 532 is configured by combining semi-rigid urethane and low repulsion urethane.
In FIG. 22, the values (values in the form of P1-Q1) shown in the respective stacked cells 531 and 532 indicate the thickness [mm] of the high-resilience urethane or semi-rigid urethane on the left side P1. The value Q1 of this represents the thickness [mm] of the low-resilience urethane.
Here, in this embodiment, it is assumed that the human body is symmetrical. For this reason, the design is performed only on one side of the right half or the left half of the human body, and the design is performed symmetrically after designing the one side.

  Moreover, in this embodiment, the case where the trunk | drum was made into the design object part and the case where the elastic adjustment part (1st elastic adjustment part 21 corresponding to the trunk support part 15 in the example of FIG. 2) was designed was shown. Furthermore, when designing other parts of the human body (the second elastic adjustment unit 22 corresponding to the pillow installation unit 13 in the example of FIG. 2 and the third elastic adjustment unit 23 corresponding to the foot placement unit 17). The part is designed based on the information (human body information) of the part as a design target part.

An example of a result of comparing a mattress designed and manufactured (in this case, a prototype) with a conventional mattress will be described as a reference.
FIG. 23 is a diagram illustrating an example of the body pressure distribution measurement result 551 regarding the body pressure dispersion type mattress according to the embodiment.
FIG. 24 is a diagram showing an example of a body pressure distribution measurement result 571 regarding a mattress according to a conventional product.

FIG. 25 is a diagram illustrating an example of comparison of maximum body pressure between the embodiment and the conventional product.
In FIG. 25, the vertical axis represents the maximum body pressure value (mmHg). It was confirmed that the maximum body pressure value 1001 of the body pressure dispersion type mattress of the embodiment is reduced by about 23% compared to the maximum body pressure value 1002 of the conventional product.
FIG. 26 is a diagram illustrating an example of a comparison of contact areas between the embodiment and the conventional product.
In FIG. 26, the vertical axis represents the contact area (mm ² ). It has been confirmed that the contact area 1011 of the body pressure dispersion type mattress of the embodiment is increased by about 15% (that is, the body weight is supported on a wider surface) than the contact area 1012 of the conventional product.
Thus, in the body pressure dispersion type mattress of the embodiment, better performance was obtained as compared with the conventional product.

(Modification)
<Design of mattress by posture maintenance type method>
Hereinafter, points different from the mattress design by the body pressure dispersion type method described above will be described, and detailed description of common parts will be omitted.
For example, the structure in which the mattress is composed of a plurality of stacked cells, the block matrix 711, and the method of creating the human body model are the same as those of the body pressure dispersion method.
In the posture maintaining method, the load that the stacked cell assumes when designing the mattress is different from that in the body pressure dispersion method.

With reference to FIGS. 27 to 31, the design of the mattress by the attitude maintaining type method will be described.
When designing a mattress, the weight of each stacked cell is not made uniform, but the weight of the human body existing above each stacked cell. Thereby, the design of the mattress which can maintain the posture after the human body sinks into the mattress in the posture of the human body model can be expected.

FIG. 27 is a diagram for explaining the calculation of the weight of the human body related to the stacked cell 612.
27, the mattress 611, the stacked cell 612, the human body model 601 before sinking (before parallel movement), and the distance γ _n [mm] from the upper surface of the mattress 611 to the human body model 601 (n is each stacked layer) Cell identification number), the human body model 602 after subduction (after translation), the generated center point 624, a line passing through the center point 624 and perpendicular to the surface of the mattress 611, and the human body before subtraction. The intersection of the model 601 (point 621, point 622), the intersection of the line and the human body model 602 after sinking (the point 622, point 623 described above), and the amount of sinking the human body model 602 into the mattress 611 (sinking) And the thickness L102 (= δ _n ) of the human body (human body model 601) in the direction perpendicular to the surface of the mattress 611 through the center point 624. The sinking amount L101 is an amount by which the stacked cell 612 sinks.

Set the density of the human body. The density of the human body may be, for example, a value obtained by measuring the actual density of the user's human body, or may be a value in which a standard human body density is defined, or other values. It may be.
For each stacked cell 612, a distance γ _n in the Z-axis direction from the center point 624 to the human body model 601 before sinking is calculated. This calculation may be performed using an arbitrary function, and may be performed using, for example, Geologic Control.
The amount that the human body model 602 after sinking sinks into the mattress 611 (the sinking amount L101) is set to a predetermined value (60 mm in this embodiment). Then, the deformation amount (60−γ _n ) is calculated for each stacked cell 612.
The weight of the trunk to be designed is set to a calculated value (in this example, 21.9 kg). Note that an estimated value may be used instead of the calculated value (for example, see Non-Patent Documents 1 and 2).

In this example, since it is a posture maintenance type, the weight of the human body existing above each stacked cell 612 is calculated as follows.
That is, the thickness L102 (= δ _n ) of the human body (human body model 601) existing above each stacked cell 612 is calculated. Approximate the volume of the human body existing above each stacked cell 612 based on the area of the upper end surface of each stacked cell 612 (in this embodiment, 50 mm × 50 mm) and the calculated value of the thickness L102 (= δ _n ). Calculate automatically. This calculation is, for example, the product of the area and the thickness. Next, for each stacked cell 612, the calculated volume is multiplied by the density of the human body, and the result is regarded as the weight of the human body existing above the respective stacked cell 612.
Thereby, since the deformation amount and the reaction force (weight of the human body) are determined, the configuration of the urethane is determined by reading the block matrix 711. This result is applied to each elastic body of each stacked cell 612. Then, the mattress design is completed.

FIG. 28 is a diagram illustrating an example of a design result of a posture maintaining type mattress.
FIG. 28 shows a mattress structure 651 according to the design result. FIG. 28 shows X2-Y2 orthogonal coordinates for explanation, and the positive direction of the Y2 axis is the head side of the human body.
In the example of FIG. 28, the mattress structure 651 includes a plurality (= 6 × 14) of stacked cells, and has a pattern of a high-repulsion-low-repulsion stacked cell 671 and a semi-hard-low-repulsive stacked cell 672. They are shown separately.
The high-repulsion-low-repulsion laminated cell 671 is configured by combining high-repulsion urethane and low-repulsion urethane.
The semi-rigid-low repulsion laminated cell 672 is configured by combining semi-rigid urethane and low repulsion urethane.
In FIG. 28, values (values in the form of P2-Q2) shown in the respective stacked cells 671, 672 indicate that the value P2 on the left side represents the thickness [mm] of the high-resilience urethane or semi-rigid urethane, The value Q2 represents the thickness [mm] of the low-resilience urethane.
Here, in this embodiment, it is assumed that the human body is symmetrical. For this reason, the design is performed only on one side of the right half or the left half of the human body, and the design is performed symmetrically after designing the one side.

  Moreover, in this embodiment, the case where the trunk | drum was made into the design object part and the case where the elastic adjustment part (1st elastic adjustment part 21 corresponding to the trunk support part 15 in the example of FIG. 2) was designed was shown. Furthermore, when designing other parts of the human body (the second elastic adjustment unit 22 corresponding to the pillow installation unit 13 in the example of FIG. 2 and the third elastic adjustment unit 23 corresponding to the foot placement unit 17). The part is designed based on the information (human body information) of the part as a design target part.

With reference to FIGS. 29-31, the example of the result of having confirmed the effect of the attitude | position maintenance type mattress of embodiment is shown.
FIG. 29 is a diagram for explaining modeling by 3D CAD.
FIG. 29 shows a result of modeling the shape of the designed posture maintaining type mattress by 3D CAD (mattress 691) and a human body model 692. The human body model 692 is a human body model composed of cortical bone, intervertebral disc, and other tissues, and is the same model as the user's body shape.
The human body model 692 is placed on the top of the mattress 691.
Here, as the information on the cortical bone and the intervertebral disc, the mechanical property values quoted from the “Physical property value database of body tissue” (refer to URL http://cfd-duo.raken.jp/cbms-mp/j/). Applied. In addition, as the other tissue information, the mechanical characteristic value of fat was applied. As a result, when a change in posture (deformation of the human body model 692) occurs when the human body (human body model 692) sinks into the mattress 691, the intervertebral disc is deformed and stress is generated in the intervertebral disc model.

FIG. 30 is a diagram illustrating an example of the analysis result of the human body model.
FIG. 30 shows the mattress 693 and the human body model 694 after deformation. Further, the maximum point 695 of the deformation amount is shown.

FIG. 31 is a diagram showing an example of comparison of stresses generated in the intervertebral disc between the embodiment and the conventional product.
In the graph shown in FIG. 31, the horizontal axis represents the position of the human body in the height direction, and the vertical axis represents the intervertebral disc stress [MPa]. The graph shows a characteristic 1021 for the posture maintaining type mattress according to the embodiment and a characteristic 1022 of the mattress according to the conventional product.
In addition, cervical vertebrae (fifth cervical vertebrae to seventh cervical vertebrae), thoracic vertebrae (first thoracic vertebrae to twelfth thoracic vertebrae), and lumbar vertebrae (first lumbar vertebrae to fifth lumbar vertebrae) are shown as positions in the height direction of the human body.

In this way, the shape of the designed posture maintaining type mattress was modeled by 3D CAD, and appropriate mechanical characteristics were applied to each stacked cell, and the effect was confirmed by biomechanical simulation utilizing a human body model. At this time, the weight assumed at the time of designing the mattress was defined in the human body, and a biomechanical simulation in which the human body model sinks into the mattress was performed.
As a result, in the posture maintaining type mattress according to the embodiment, the stress generated between the tenth thoracic vertebra and the fourth lumbar vertebra is smaller than that of the conventional product (see the range 1031 shown in FIG. 31). This indicates that the posture maintaining type mattress according to the embodiment shows that the shape of the intervertebral disc has not been deformed from before the start of analysis as compared with the conventional product, and the posture before the start of analysis (that is, when creating a human body model) This shows that you can sleep while maintaining your posture.

In the following, the mattress design preparation will be described in more detail.
In the present embodiment, the design preparation is common between the case where the body pressure dispersion type mattress is designed and manufactured and the case where the posture maintaining type mattress is designed and manufactured.

<Material test for design preparation>
The material test in the design preparation will be described.
A material test of urethane, which is a mattress material, is performed, and a strain energy function that can reproduce the deformation behavior by FEM analysis is derived. The strain energy function represents the deformation behavior.
Specifically, first, a material test of a mattress material is performed. For example, for each material, urethane, which is a mattress material, is cut into a cylindrical shape, and a compression test and a volume test are performed. For each material, urethane is cut into a dumbbell shape and a tensile test is performed. In the material test of each urethane, a stress-strain diagram is obtained.
Next, a strain energy function for reproducing the deformation behavior of urethane is derived for each material based on the stress-strain diagram. In this embodiment, the result of the material test is approximated by a strain energy function that can reproduce the volume change. In this embodiment, Ogden-foam is selected as an example of the strain energy function. Further, the approximation work may be performed using a computer or the like, and is executed by, for example, ANSYS APDL curve fitting.

Here, with respect to the strain energy function W, Ogden-foam is shown in Equation (1). Variables λ ₁ , λ ₂ , and λ ₃ in equation (1) represent the stretch ratios in three directions, J represents the determinant of the elastic deformation gradient, N represents the order, and other variables α _i , β _i , μ _i represents a material constant determined according to a material or the like (for example, physical characteristics). Here, the order N is also handled as one of the material constants. Note that i is used in calculation as a variable taking 1 to N. In this embodiment, Formula (1) is used for fitting.

  Next, an experiment of pushing the center of urethane cut out into a rectangular parallelepiped and an analysis of reproduction were performed, and it was confirmed that deformation behavior could be reproduced by FEM analysis. This analysis may be performed using a computer or the like, and is executed by, for example, ANSYS Workbench.

FIG. 32 is a diagram illustrating an example of a deformation behavior reproduction result.
In the graph shown in FIG. 32, the horizontal axis represents displacement [mm], and the vertical axis represents load [N]. A characteristic 1101 as an experimental result and a characteristic 1102 as a result of reproduction by FEM analysis are shown. These are close to practical use, and the degree of coincidence is good where the displacement is small.

<Creating a block matrix for design preparation>
Creation of a block matrix in design preparation will be described. In the present embodiment, a computer simulation is performed using a strain energy function to create a block matrix.

FIG. 33 is a diagram illustrating an example of a block matrix 711 (stacked cell information) according to the embodiment.
Information of the block matrix 711 is stored in the stacked cell information storage medium. The stacked cell information storage medium may be, for example, a storage device included in a computer, a portable recording medium (storage medium), or a medium such as paper. . The information of the block matrix 711 may be acquired by a device such as a computer, for example, or may be acquired by a person (a trader in the present embodiment).

The block matrix 711 includes a portion (column 721) indicating the configuration (lamination ratio) of urethane, a portion (column 722) indicating the amount of deformation of urethane, and a portion (column 723) indicating the reaction force (= weight) of urethane. Including.
The portion (column 721) indicating the configuration of urethane includes two columns (in the example of FIG. 33, column A and column B). Regarding the laminated cell, the value of the thickness (length in the direction of lamination) of the low-repulsive urethane is stored in one column (A column), and the high-repulsive urethane or semi-rigid urethane is stored in the other column (B column). The value of the thickness (length in the stacking direction) is stored. In the present embodiment, the sum of the value in the A column and the value in the B column (the total height in the thickness direction) is fixed to 100 mm.
In the portion (column 722) indicating the amount of deformation of urethane, the value of the amount of deformation is stored.
The value of the reaction force is stored in the portion (column 723) indicating the reaction force (= weight to be supported) of urethane. In the example of FIG. 33, the value of the reaction force is indicated as “ak−j”, k (k = 0 to 100) represents the thickness of the material A, and j (j = 1 to 99) is a deformation. It represents the quantity.
Thus, in the block matrix 711, the thickness of the low-repulsion urethane, the thickness of the high-repulsion urethane or semi-rigid urethane, the deformation amount, and the reaction force are stored in association with each other for the stacked cells.
In the present embodiment, the stacked cell is regarded as a block and is called a “block matrix”. Each stacked cell is composed of a plurality of materials having different hardness (elastic modulus) (in this embodiment, two materials A and B). Then, the thickness of the stacked cell is made constant (100 mm in this embodiment), and the hardness of the stacked cell is adjusted by changing the stacking ratio of each material.
Here, in this embodiment, the case where the thickness of the stacked cell is made constant is shown. However, as another configuration example, a configuration capable of changing the thickness of the stacked cell at the time of design or the like is used. For example, it may be possible to design and manufacture the mattress by changing the thickness of the stacked cell (the value of the item called the thickness of the stacked cell) according to the customer's request or the like.

As an example, the block matrix 711 is created as follows.
First, a CAD model that reproduces the stacked cell is generated (for example, a model as shown in FIG. 3). The size of the block constituting the stacked cell is 50 mm × 50 mm × 100 mm. In the present embodiment, each stacked cell is configured by stacking two different materials (material A, material B), and the hardness of the block is changed by changing the thickness of each material A, B.

Next, the strain energy function derived in the material test described above is applied to the generated CAD model.
In the present embodiment, a case where the thicknesses of the materials A and B are changed in units of 1 mm is shown. In this case, regarding the configuration of the urethane, from the state where the thickness of the material A is 0 mm and the thickness of the material B is 100 mm, the thickness of the material A is increased by 1 mm (that is, the thickness of the material B is increased). The thickness of the material A is changed to 100 mm and the thickness of the material B is changed to 0 mm. With respect to the thickness of each of the materials A and B, the reaction force when the block is deformed by a deformation amount of D [mm] is calculated by FEM analysis. In the present embodiment, the deformation amount D is changed from 1 mm to 99 mm in 1 mm units.
Thus, the relationship between the thicknesses of the materials A and B, the deformation amount, and the reaction force can be obtained, and the block matrix 711 can be created. In this embodiment, the block matrix 711 stores 9999 (= 101 × 99) pattern information.

A block matrix 711 can be created by combining these results.
In the present embodiment, the block in the case where the material A (first urethane 33a in the example of FIG. 3) is a low-resilience urethane and the material B (second urethane 33b in the example of FIG. 3) is a high-resilience urethane. A matrix and a block matrix when the material A (first urethane 33a in the example of FIG. 3) is a low-resilience urethane and the material B (second urethane 33b in the example of FIG. 3) is a semi-rigid urethane. Create both. And when using high resilience urethane, the block matrix corresponding to high resilience urethane is referred, and when using semi-rigid urethane, the block matrix corresponding to semi-rigid urethane is referred.

In this embodiment, numerical analysis by the finite element method is used. In this case, Ogden-foam is used as an example of the strain energy function, but any other calculation method is used as another configuration example. May be. That is, any calculation method may be used as long as the relationship among the thicknesses, deformation amounts, and reaction forces of the materials A and B as in the block matrix 711 according to the present embodiment can be obtained. For this purpose, an arbitrary measurement technique may be used.
Moreover, in this embodiment, although the elastic body which comprises each laminated cell was made into 2 types (2 layers), as another structural example, it is good also as 3 types or more (3 layers or more). Like the materials A, B, C,..., Three or more types of elastic body thickness parameters are stored in the material column.

Here, in the above description, each stacked cell 31 has a square shape in plan view, but a stacked cell 31A formed in a strip shape as shown in FIG. 6 may be used. A mattress structure corresponding to the example of FIG. 6 will be described with reference to FIG. Note that the example of FIG. 34 shows a case where a mattress including only an elastic adjustment portion corresponding to the first elastic adjustment portion 21A of the trunk is designed and manufactured. A similar design method may be applied to other elastic adjustment units (for example, the second elastic adjustment unit 22A and the third elastic adjustment unit 23A).
FIG. 34 is a diagram illustrating an example of the structure of a mattress in another example.
In the example of FIG. 34, a planar structure 301A and a cross-sectional shape 302A of a mattress in another example are shown. The design target portion 321A is disposed so as to reach both ends in the shoulder width direction of the mattress. In the design target portion 321A, a plurality of band-shaped stacked cells are arranged in the height direction. An elastic body 822a and an elastic body 822b are stacked for each stacked cell.
In the example of FIG. 34, the dimensions L11 to L13, L21, L23, and L31 are the same as those in the example of FIG. 16, but other values may be used.

An example of a method for designing the mattress shown in FIG. 34 will be described.
Schematically, an elastic adjustment unit having a strip-shaped stacked cell as shown in FIG. 34 first includes a plurality of (six in the example of FIG. 16) small stacked cells in the shoulder width direction as shown in FIG. It is designed by using (utilizing) information on the result of the design after designing the elastic adjustment unit provided. Here, when assuming an elastic adjustment unit including a plurality of small stacked cells in the shoulder width direction, both ends of the plurality of small stacked cells do not reach both ends of the shoulder width direction (that is, both ends of the plurality of small stacked cells It is designed assuming a configuration in which there is a frame around it, and thereafter, it is replaced with a strip-shaped laminated cell that is longer in the shoulder width direction (in this embodiment, reaches both ends in the shoulder width direction). This is because, in the present embodiment, the elastic adjustment unit is designed based on the range in which the user's human body exists on the mattress. Conversely, the user's human body does not exist on the mattress. This is because the elastic adjustment portion cannot be designed.
(Procedure 1) to (Procedure 3) are shown as an example of the procedure for designing the mattress shown in FIG.
(Procedure 1) First, as described above, the elastic adjustment unit including a plurality of small stacked cells in the shoulder width direction is designed as shown in FIG.
(Procedure 2) For each row (each height direction), a plurality of small stacked cells in the shoulder width direction are grouped in a band shape and further stacked to reach both ends in the shoulder width direction (shown in FIG. 34). To a belt-like stacked cell). As a result, for each row (each height direction), the plurality of small stacked cells in the shoulder width direction are replaced with one strip-shaped stacked cell.
(Procedure 3) The hardness of each band-shaped laminated cell after the above replacement is determined. Thereby, the elastic adjustment part in which hardness was decided for every strip | belt-shaped lamination | stacking cell is designed.
Here, as a method for determining the hardness of each strip-shaped stacked cell, any method may be used. For example, any one of the following (determination methods 1) to (determination method 4) may be used. One may be used.
(Determination method 1) Based on the design results of a plurality of small stacked cells in the shoulder width direction before replacement with a band-shaped stacked cell for each column (each height direction), among these plurality of small stacked cells The hardness of the band-shaped laminated cell is determined to be the same as the hardness of the hardest (that is, the highest hardness) laminated cell.
(Determination method 2) Based on the design results of a plurality of small stacked cells in the shoulder width direction before replacement with a strip-shaped stacked cell for each column (each height direction), among these plurality of small stacked cells The hardness of the band-shaped laminated cell is determined to be the same as the hardness of the softest (that is, the lowest hardness) laminated cell.
(Determination method 3) Based on the design results of a plurality of small stacked cells in the shoulder width direction before replacement with a strip-shaped stacked cell for each column (each height direction), the hardness of the plurality of small stacked cells The average value (average hardness) of the band-shaped laminated cell is determined.
(Determination method 4) Based on the design results of a plurality of small stacked cells in the shoulder width direction before replacement with a strip-shaped stacked cell for each column (each height direction), among these plurality of small stacked cells The hardness of the band-shaped laminated cell is determined to be the same as the hardness of the laminated cell located at (or near) the center (the portion corresponding to the midline of the human body). In the example of FIG. 16, the stacked cell located at the center is the third or fourth stacked cell among the six small stacked cells arranged in the shoulder width direction. In this embodiment, the stacked cell is in the shoulder width direction. The third and fourth stacked cells have the same hardness because they are symmetric with respect to the central axis orthogonal to.

As described above, in the present embodiment, the mattress is designed and manufactured based on the body shape of the user of the mattress. This provides a mattress (body pressure dispersion type mattress) with improved body pressure dispersibility compared to conventional products, or a mattress (posture maintenance type mattress) that can control the sleeping posture of conventional products. Can do.
For example, in the present embodiment, a user's body shape is measured using a 3D scanner or the like, and a mattress is designed and manufactured using the three-dimensional shape data obtained thereby.
Moreover, in this embodiment, the hardness of a mattress is changed by laminating | stacking the several raw material from which hardness differs for every lamination cell, and changing the thickness of each raw material.
Further, in the present embodiment, the mattress is designed and manufactured based on the result of reproducing the deformation behavior by performing a computer simulation utilizing the mechanical characteristics of the material acquired based on the result of the material test. .
Further, in the present embodiment, a table (block matrix 711) in which the relationship between the lamination ratio (urethane configuration), the amount of deformation, and the reaction force when a plurality of materials are laminated is obtained by computer simulation and the results are summarized. To design and manufacture mattresses.

Below, the example of a structure of the process step in the case of manufacturing the mattress 10 shown in FIGS. 1-5 by the procedure of the process shown in FIGS. 7-9 is shown. In this case, a block matrix 711 shown in FIG. 33 is used.
As one structural example, in the manufacturing method of the elastic structure (in the example of FIGS. 1 to 5, the mattress 10), the main body (the user P in the examples of FIGS. 1 to 5) that supports the object (FIG. 1). In the example of FIG. 5, the main body part 11) and an elastic adjustment part (in the example of FIGS. 1 to 5, for example, the elastic adjustment part 21) provided in a part of the main body part are provided. Is a stacked cell (stacked cell 31 in the example of FIGS. 1 to 5) in the plane direction intersecting the load application direction from the object to the main body (load applied direction F in the example of FIGS. 1 to 5). Each of the laminated cells is manufactured into an elastic structure in which a plurality of elastic bodies having different elastic moduli (in the examples of FIGS. 1 to 5, elastic bodies 33a and 33b) are stacked in the load application direction. It is a manufacturing method of an elastic structure. The laminated cell in which the lamination ratio, which is the ratio of the thickness of each elastic body included in the laminated cell, in the load application direction, the deformation amount with respect to the load of the laminated cell, and the reaction force against the load of the laminated cell are associated with each other. Stack cell information acquisition step of acquiring stack cell information from the stack cell information storage medium storing information (in the example of FIG. 33, the block matrix 711) (in this embodiment, the process of step S16 shown in FIG. 8). A trunk shape information acquisition step (in this embodiment, the process of step S8 shown in FIG. 7) for acquiring trunk shape information indicating the trunk shape of the user of the elastic structure, and the position of the elastic structure Among the plurality of stacked cells arranged at positions corresponding to the user's trunk (the trunk Pa in the examples of FIGS. 1 to 5), the stacking ratio is determined in the stacked cell information acquisition step. The acquired stacking cell information and the processing of the stacking ratio determination step (step S18 shown in FIG. 8 in this embodiment) determined based on the trunk shape information acquired in the trunk shape information acquisition step. Have.
Therefore, the laminated cell in which the lamination ratio, which is the ratio of the thickness of each elastic body included in the laminated cell, in the load application direction, the deformation amount with respect to the load of the laminated cell, and the reaction force against the load of the laminated cell are associated with each other. Since the stacking ratio of each of the plurality of stacked cells is determined based on the stacked cell information storage medium in which information is stored, an elastic structure that is comfortable for the user can be manufactured.

As an example of the configuration, in the elastic structure manufacturing method, based on the trunk shape information acquired in the trunk shape information acquisition step, the trunk weight estimation step of estimating the weight of the user's trunk (this embodiment) Then, the stacking ratio determination step determines the stacking ratio based on the weight of the user's trunk estimated in the trunk weight estimation step.
Therefore, since the weight of the user's trunk is estimated and the lamination ratio is determined, an elastic structure that is comfortable for the user can be manufactured in consideration of the weight of the trunk of the user.

As an example of the configuration, in the method for manufacturing an elastic structure, the trunk weight estimation step estimates the weight of the trunk of the user based on the weight of the user.
Therefore, since the weight of the trunk is estimated based on the weight of the user, the weight of the trunk can be estimated based on the actual information (body weight) of the user, and an elastic structure that is comfortable for the user can be obtained. Can be manufactured.

As one configuration example, in the elastic structure manufacturing method, the stacking ratio determining step determines the stacking ratio based on reaction force distribution information indicating a reaction force distribution mode of the elastic structure according to the use of the elastic structure. To do.
Therefore, since the lamination ratio is determined based on the reaction force distribution information indicating the reaction force distribution mode of the elastic structure according to the use of the elastic structure, the elasticity that is comfortable for the user according to the use of the elastic structure. A structure can be manufactured.
In the present embodiment, for example, a mattress is manufactured based on information on each pressure distribution (reaction force distribution) according to a body pressure dispersion type application or a posture maintenance type application.

As one configuration example, in the elastic structure manufacturing method, the elastic structure is a mattress of a bedding.
Therefore, a mattress that is comfortable for the user can be manufactured.

As an example of the configuration, in the elastic structure manufacturing method, the stacked cell information in which the stacking ratio, the deformation amount, and the reaction force are associated with each other by performing a simulation using a strain energy function representing the deformation behavior of the stacked cell. Stack cell information acquisition step (in this embodiment, the processing of Step S101 to Step S110 shown in FIG. 9 is included.
Therefore, it is possible to obtain suitable stacked cell information by performing a simulation on the stacked cell using a strain energy function representing the deformation behavior.

  In the present embodiment, the processing procedures shown in FIGS. 7 to 9 are executed by, for example, a customer or a contractor, and use a device such as a computer or various measuring devices as necessary. As another configuration example, a configuration in which any part of the processing procedures shown in FIGS. 7 to 9 is automatically executed by a computer according to a preset computer program may be used. In this case, information (data) used by the computer may be stored in a storage medium readable by the computer, or may be input to the computer by a human operation. For example, a system may be constructed in which one or more of Step S8, Step S9, Step S12, Step S14, Step S15, and Step S18 are automatically executed by a computer based on input information.

As described above, a program for realizing the functions of the processes according to the above-described embodiments is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read by a computer system. By executing, it is possible to perform processing.
The “computer system” herein may include hardware such as an operating system (OS) and peripheral devices.
The “computer-readable recording medium” means a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a writable non-volatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disc), A storage device such as a hard disk built in a computer system.
Further, the “computer-readable recording medium” refers to a volatile memory (for example, DRAM (DRAM) inside a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Dynamic Random Access Memory)) that holds a program for a certain period of time is also included.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the above program may be for realizing a part of the functions described above. Further, the above program may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, the shape and dimensions of each part constituting the mattress are not limited to the example of the embodiment, and various aspects may be used.
For example, regarding a plurality of stacked cells constituting one elastic adjustment unit, the number of stacked cell columns (the number in the height direction), the number of stacked cell rows (the number in the shoulder width direction), and the total number of stacked cells Any number may be used, and it may be variably determined according to the body shape of the user of the mattress. Specifically, in the example of FIGS. 2 and 6, the number of stacked cells in the height direction is 3 (second elastic adjustment unit), 14 (first elastic adjustment unit), and 8 (third elastic adjustment unit). However, the number may be any number. In the example of FIGS. 2 and 16, the number of stacked cells in the shoulder width direction is six, but this number may be any number. Further, in the example of FIGS. 16 and 34, the number of stacked cells in the height direction is 14, but this number may be any number.
Further, for example, the range (design range) in which the elastic adjustment portion is provided on the mattress may be arbitrary, and may be variably determined according to the body shape of the user of the mattress.

DESCRIPTION OF SYMBOLS 10 Mattress 11 Main body part 13 Pillow setting part 15 Trunk support part 17 Foot arrangement | positioning parts 19 and 20 Surface layer 21 1st elastic adjustment part 22 2nd elastic adjustment part 31 Laminated cell 33 Elastic body P User Pa Trunk Pb Head Part Pc Foot L Axis F Load application direction 711 Block matrix

Claims (17)

A main body for supporting the object;
An elastic adjustment portion provided in a part of the main body portion;
With
The elastic adjustment unit is divided into a plurality of stacked cells in a plane direction intersecting a load application direction from the object with respect to the main body unit,
Each laminated cell is characterized in that a plurality of elastic bodies having different elastic moduli are laminated in the load application direction. The main body is
A trunk support unit provided at a position corresponding to the trunk in a state where the user as the object is supine;
A pillow installation unit in which the user's head is placed in a state where the user lies on the trunk support unit;
Have
The elastic structure according to claim 1, wherein the trunk support portion is provided with the first elastic adjustment portion. The main body has a foot placement part on which the user's foot is placed on the opposite side of the pillow placement part across the trunk support part,
3. The elastic structure according to claim 2, wherein the second elastic adjustment unit is provided in at least one of the pillow installation unit and the foot placement unit.   The elastic structure according to any one of claims 1 to 3, wherein a load supported by each of the stacked cells is formed to be uniform.   The elastic structure according to any one of claims 1 to 3, wherein the load supported by each stacked cell is a weight of a portion corresponding to the stacked cell in a user as the object.   With respect to the axis set along the height direction of the user as the object in the supine state, the stacking ratios of the plurality of elastic bodies in the stacking cells arranged at the left and right symmetrical positions are substantially the same. The elastic structure according to any one of claims 1 to 5, wherein:   The elastic structure according to any one of claims 1 to 6, wherein a stacking ratio of the plurality of elastic bodies in each stacked cell is substantially the same in a shoulder width direction.   The elastic structure according to claim 1, wherein the elastic body includes a synthetic resin foam.   The elastic structure according to claim 8, wherein the synthetic resin foam is urethane foam. The main body includes a surface layer formed of an elastic body,
The elastic structure according to any one of claims 1 to 9, wherein the surface layer is provided so as to overlap a plurality of the stacked cells arranged side by side.   The elastic structure according to any one of claims 1 to 10, wherein the elastic structure is a mattress of a bedding. A main body part that supports the object; and an elastic adjustment part that is provided in a part of the main body part, wherein the elastic adjustment part is a surface direction that intersects a load application direction from the object to the main body part. The laminated cell is divided into a plurality of cells, and each of the laminated cells is an elastic structure manufacturing method for manufacturing an elastic structure in which a plurality of elastic bodies having different elastic moduli are stacked in the load application direction,
The stacking ratio, which is the ratio of the thickness of each elastic body included in the stack cell, in the load application direction, the deformation amount with respect to the load of the stack cell, and the reaction force with respect to the load of the stack cell are associated with each other. A stacked cell information acquisition step of acquiring the stacked cell information from the stacked cell information storage medium in which the stacked cell information is stored;
Trunk shape information acquisition step for acquiring trunk shape information indicating the trunk shape of the user of the elastic structure;
The stacked cells obtained in the stacked cell information acquisition step with respect to each of the plurality of stacked cells arranged at a position corresponding to the user's trunk in the position of the elastic structure. Information and a stacking ratio determination step for determining based on the trunk shape information acquired in the trunk shape information acquisition step;
The manufacturing method of the elastic structure characterized by having. Based on the trunk shape information acquired in the trunk shape information acquisition step, has a trunk weight estimation step of estimating the weight of the trunk of the user,
The elastic layered body according to claim 12, wherein the stacking ratio determining step determines the stacking ratio based on the weight of the user's trunk estimated in the trunk weight estimation step. Production method.   The method for manufacturing an elastic structure according to claim 13, wherein the trunk weight estimating step estimates the weight of the trunk of the user based on the weight of the user.   13. The stacking ratio determining step determines the stacking ratio based on reaction force distribution information indicating a reaction force distribution mode of the elastic structure according to an application of the elastic structure. 15. The method for producing an elastic structure according to any one of items 1 to 14.   The method of manufacturing an elastic structure according to any one of claims 12 to 15, wherein the elastic structure is a mattress of a bedding.   A stacked cell information acquisition step of acquiring the stacked cell information in which the stacking ratio, the deformation amount, and the reaction force are associated with each other by performing a simulation using a strain energy function representing a deformation behavior for the stacked cell. The method for producing an elastic structure according to any one of claims 12 to 16, wherein the elastic structure is provided.