JP2020031981A - Cushion material - Google Patents

Abstract

To provide a cushion material capable of improving both sitting posture stability and suppression of forward displacement while maintaining prescribed body pressure dispersion performance.SOLUTION: A cushion material has a configuration where a second resin layer is layered on a first resin layer. The first resin layer is provided with at least one hole part which is bottomed or bottomless. The second resin layer is provided with one or more notch patterns each of which is composed of at least three linear through cut grooves that go through in the thickness direction of the second resin layer and cross each other at a prescribed intersection in an area facing at least the hole part. A cantilever projection piece composed of an area between adjacent linear through cut grooves of the notch patterns and a projection piece area peripheral part following the root of the projection piece can be elastically deformed. The projection piece and/or the projection piece area peripheral part are elastically deformed to face the hole part in the way that an opening edge part of the hole part of the first resin layer and/or at least part of the inner wall of the hole part are covered when the load in a vertical direction acts on the notch patterns.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cushion material having a body pressure dispersing effect suitable for use in chairs, wheelchairs, vehicle seats, mattresses and the like.

  2. Description of the Related Art A cushioning material having improved body pressure dispersibility by a structure in which a relatively low-repulsion urethane foam is laminated on the surface of a urethane foam having a specific surface structure has been widely used.

  In Patent Documents 1 and 2, the present applicant has formed a large number of block elements partitioned by grooves on the surface of a cushion base made of a soft synthetic resin foam such as urethane foam, and provided a low surface on the upper surface of the cushion base. We have proposed a cushioning material in which sheet materials such as repulsive urethane foam are laminated.

  In Patent Literature 1, the grooves in the cushion base material have different depths in accordance with the line of the body of the user (seated person), and the protrusions in the contact direction of the body contacting the cushion material protrude. It is formed so as to become deeper at the corresponding part. In Patent Literature 2, an insert made of a soft synthetic resin is inserted into a groove of a cushion base material to fill the groove, preventing buckling of the block element and concentrating body pressure of the cushion base material. The hardness of the periphery is changed to be hard. In inserting the insert, the insert is arranged so as to surround a plurality of block elements at locations where a heavy load is applied on the cushion base material.

  The cushioning materials described in Patent Literatures 1 and 2 have a feature that the body pressure dispersing performance is remarkably excellent. It is used in wheelchairs, mattresses, and the like as a cushioning material for preventing a progressive pressure ulcer.

  On the other hand, when such a cushioning material is used for a wheelchair or a mattress, a so-called “front shift” may occur, in which the seated bone position of the seated person gradually shifts forward. When the forward displacement occurs, the occupant slides down from the cushioning material, and due to the relatively long-term use, the shear force generated between the seat portion and the buttocks of the occupant caused by the forward displacement causes the occupant to be disengaged. Bedsore may occur, and furthermore, the pressure on the buttocks of the occupant from the seat where the buttocks of the occupant are in contact with the cushioning material may cause pressure on the occupants' internal organs and respiratory organs, resulting in a loss of physical balance. Is likely to occur.

  In order to solve such a problem, for example, in Patent Document 3, at least a sacrum, a coccyx, and a sciatic nodule are provided at the back of the buttocks between a seating portion that receives body pressure and a seat pressure follower that disperses body pressure. Except for the buttocks supporting part supporting both gluteus maximus muscle parts, a cushioning material that improves the supportability against body sway and disperses body pressure by using a structure with a frame-shaped hole is proposed. ing.

  In addition, for example, in Patent Document 4, a cushioning material is provided which has a structure in which a bottom cushioning material and an upper cushioning material are covered with a skin material, and receives the buttocks of a seated person, wherein the bottom cushioning material is harder than the upper cushioning material. At the same time, a plurality of elongated slits are formed in parallel with the bottom cushioning material at the portion where the ischium tuberculum of the buttocks and the periphery thereof are located when seated, and are made of the same or harder than the upper cushioning material. There has been proposed a cushion material in which a long-sized inserted cushion material softer than the bottom cushion material is fitted and fixed in a slit of the bottom cushion material. According to this cushioning material, the sitting time becomes longer, and when the occupant feels pain due to compression in the periphery of the sciatic tuberosity of the buttocks, the seating position is moved forward or backward, and the part where the pain is felt is moved. By moving the fitting cushion member above, the pain caused by the compression can be reduced.

  Further, for example, in Patent Document 5, by continuously changing the repulsive force of the cushioning material in the front-rear direction, the body pressure distribution due to the load of the seated person is continuously changed to disperse the body pressure due to the load of the seated person. Has been proposed to improve the comfort of the seated occupant and to prevent the seat from slipping forward.

  Further, for example, in Patent Document 6, an upper layer portion made of a polymer gel-like material, a front intermediate layer portion made of a high hardness and low resilience polyurethane foam disposed on a lower front portion of the upper layer portion, and an upper layer portion A rear intermediate layer portion made of a low hardness and low resilience polyurethane foam disposed on the lower rear portion, and a lower intermediate layer portion made of a normal polyurethane foam disposed below the front intermediate layer portion and the rear intermediate layer portion. There has been proposed a cushion material which is excellent in body pressure dispersibility and which prevents the buttocks from shifting forward by using such a cushion core material.

Japanese Patent No. 422251 Japanese Patent No. 422280 Japanese Patent No. 4686678 Japanese Patent No. 5695265 Japanese Patent No. 5657305 Japanese Patent No. 4104436

  According to the conventional cushioning material as described above, the body pressure dispersibility of the occupant can be improved to some extent, but there is a problem when trying to prevent the occupant from moving forward while simultaneously dispersing the body pressure. Was. This is because there is a conflicting relationship between the cushion member's body pressure dispersing performance and the effect of suppressing forward slippage. That is, if the performance of dispersing the body pressure of the occupant of the cushion material is improved, the stability of the sitting position of the cushion material is reduced, and as a result, the effect of suppressing the forward displacement of the occupant is reduced. In particular, in the case where the hardness of the anchor point is large, in the case where the hardness of the anchor point is large when a hardness step is provided in the seating surface portion and a structure having a high hardness is used as a weir-like structure (referred to as an anchor point) as in Patent Literature 3, Although the effect of preventing forward slippage is excellent, the effect of dispersing body pressure at the anchor point is reduced. If the hardness of the anchor point is small, the effect of dispersing body pressure is excellent but the effect of preventing forward slippage is reduced. Note that the anchor point represents a structure including not only such a hardness step but also a step for preventing a forward displacement such as a height step.

  The present invention is to solve such a problem of the prior art, and an object of the present invention is to simultaneously improve the sitting stability and the effect of suppressing forward slippage while maintaining a predetermined body pressure dispersion performance. It is to provide a cushioning material.

  According to the present invention, there is provided a cushion material having a structure in which a second resin layer is laminated on a first resin layer. The first resin layer has at least one hole with or without a bottom, and the second resin layer penetrates in a thickness direction of the second resin layer at least in a region facing the hole and has a predetermined shape. It has at least one notch pattern, each of which consists of at least three linear through cut grooves that intersect each other at the intersection. A cantilever-shaped protruding piece consisting of a region between adjacent linear through-cutting grooves of this cut pattern and a peripheral portion of the protruding piece region continuous with the root of the protruding piece are configured to be elastically deformable. The projecting piece and / or the projecting piece area peripheral portion covers at least a part of the opening edge of the hole of the first resin layer and / or the inner wall of the hole when a vertical load is applied to the cut pattern. It is configured to be elastically deformed toward the hole.

  As described above, in the cushioning material of the present invention, the first resin layer has the hole, and the second resin layer laminated thereon has at least three cut grooves penetrating in the thickness direction and intersecting each other. It has a cut pattern configured. When a vertical load is applied to the cut pattern, the cantilever-shaped projecting piece, which is the area between the adjacent cut grooves of the cut pattern, and the peripheral area of the projecting piece area continuous with the base of the projecting piece, The resin layer is elastically deformed toward the hole so as to cover at least a part of an opening edge of the hole and / or an inner wall of the hole. As a result, the protruding piece and the protruding piece area peripheral portion curve downward to cover the opening edge of the hole and the periphery of the opening edge. The body pressure of the seated person is satisfactorily dispersed by increasing the ratio of the gap between the protruding pieces (the width of the cut portion) and the adjacent protruding pieces due to the curved deformation of the protruding pieces. At the same time, the periphery of the ischium is stably supported, and the sitting position stability is improved. Moreover, when a forwardly displaced horizontal load is applied, at least a part of the front opening edge and / or the inner wall of the hole (anchor point) while maintaining the above-described body pressure dispersibility and sitting stability. ), The curved protruding piece and the periphery of the protruding piece area flexibly contact and support the front edge of the sciatic bone of the seated person, so that the forward movement of the sciatic bone is moderately suppressed, and the contact pressure with the anchor point is reduced. Is prevented from rising so rapidly that the blood flow is locally blocked, and the forward displacement is effectively suppressed. As described above, according to the cushioning material of the present invention, the predetermined body pressure dispersing performance can be maintained, and further, both the sitting position stability and the effect of suppressing forward displacement can be improved.

  It is preferable that the linear through-cut groove is formed by a through slit. By forming the through slit, when a load is applied, the projecting piece and the periphery of the projecting piece area are easily curved downward so as to cover at least a part of the opening edge of the hole and / or the inner wall of the hole. This facilitates the above effects and effects.

  It is also preferable that the two cut patterns are arranged at different positions in a region facing the hole. Thereby, the followability of the user to the buttocks shape is improved, so that the body pressure dispersibility and the sitting position stability of the cushioning material can be further improved.

  In this case, it is more preferable that the distance between the intersections of the linear through-cut grooves in the two cut patterns is 110 to 140 mm. Thereby, the position of the ischial bone of the human body based on the statistical database or the like can be accurately reflected on the position of the intersection of the predetermined linear through-cut groove provided in the second resin layer, and thus the effect of suppressing the forward displacement of the seated person Can be more accurately improved.

  The second resin layer is formed at a position parallel to a straight line connecting the intersections of the linear through-cut grooves in the two cut patterns and at a predetermined distance from the intersection, and penetrates the second resin layer. It is also preferable to provide a plurality of straight through cut grooves or straight non-through cut grooves that do not penetrate the second resin layer. As a result, the protruding piece and the peripheral portion of the protruding piece area are easily curved and deformed, and the apparent hardness is also reduced. Therefore, at least a part of the opening edge of the hole of the first resin layer and / or the inner wall of the hole. Is easily covered, and can be supported in a state where the body pressure is low even when a load is applied to the opening edge and / or the inner wall. Therefore, the effect of suppressing forward displacement and the dispersibility of body pressure can be further improved at the same time. Furthermore, the position of the intersection of the linear through-cut groove of the cut pattern formed in the second resin layer and the position of the sciatic bone of the occupant are more appropriately and precisely adjusted in accordance with the data of the sciatic position of the human body of each individual. Since it is possible to face each other, it is possible to manufacture a custom-made cushioning material that matches the body shape of each individual, and to improve the effect of dispersing the body pressure of the occupant and suppress the forward displacement of the occupant. Can be further improved in accordance with the body shape of the subject. When the second resin layer has a plurality of straight through cut grooves penetrating the second resin layer, the cut pattern has some configuration such that some of the cantilever-shaped protrusions do not fall off. Have.

  It is also preferable that the three cut patterns are arranged at different positions in a region facing the hole. As a result, the number of cut patterns provided in the second resin layer increases, and the position of the intersection of these cut patterns and the position of the ischial of the occupant can be more appropriately matched. The effect of improving the body pressure dispersion performance of the seated person and the effect of suppressing the forward displacement of the seated person can be further improved by precisely corresponding to the body shape of each individual.

  In the case where there is one hole, the notch pattern is one notch pattern provided at a position facing the center of the hole, and the position of each of two regions obtained by dividing the hole into two portions, which faces the ischium of the occupant. Or three cut patterns provided at positions facing three regions obtained by dividing the hole into three, and two cut patterns are provided at positions facing the ischium of the seated person. Preferably. When there are two holes, the cut patterns are preferably two cut patterns provided at positions facing the sit bones of the occupant in each of the two holes. Furthermore, when there are three holes, the notch patterns are three notch patterns provided at positions facing each of the three holes, and two of the notch patterns are at positions opposing the ischium of the seated person. It is also preferred that they are provided. Thereby, the variation of the form of the cut pattern can be increased, and the position of the intersection of the linear through-cut grooves of the cut pattern is more accurately and precisely adapted according to the individual difference in the position of the ischium of the seated person. Thus, the effect of improving the performance of dispersing the body pressure of the seated person and suppressing the forward displacement of the seated person can be further improved.

  It is also preferable that the length of the linear through-cut groove is 20 mm or more. As a result, when a load in the vertical direction acts on the cut pattern, the protruding piece and the periphery of the protruding piece area are elastically deformed toward the hole, and the distance between the adjacent protruding pieces (width of the cut portion) is increased with this deformation. By expanding and increasing the ratio of the gap between the protruding pieces, the body pressure of the occupant is well dispersed, and the periphery of the ischium is stably supported, so that the sitting position stability is easily improved. Further, when a load (stress) due to a forward shift acts on the opening edge of the hole and / or the inner wall direction of the hole, the curved protruding piece covering the front opening edge and / or the inner wall and the periphery of the protruding piece area are seated. The front edge of the ischium of the elderly is softly supported and supported, so that the forward movement of the ischium is moderately suppressed, and the contact pressure with the anchor point rises sharply to block the blood flow locally. It is easy to obtain the effect of effectively suppressing the forward displacement without causing any inconvenience.

  It is also preferable that the cut pattern includes a plurality of concentric non-penetrating cut grooves that do not pass through the second resin layer and center on the intersection of the linear through cut grooves. Thus, when a load in the vertical direction is applied to the cut pattern, the projecting piece covers the opening edge of the hole of the first resin layer and / or the hole so as to cover at least a part of the inner wall of the hole. , The elasticity of the cutting pattern can be easily increased, so that the reliability of the effect of suppressing forward displacement can be improved, and the body pressure dispersibility of the cut pattern can be further improved.

  It is also preferable that the cut pattern includes a plurality of concentric polygonal non-penetrating cut grooves that do not penetrate the second resin layer and center on the intersection of the linear through cut grooves. Thereby, when a load in the vertical direction acts on the cut pattern, the first resin layer is elastically directed toward the hole so as to cover at least a part of the opening edge of the hole and / or the inner wall of the hole. Since it is easy to deform, the reliability of the effect of suppressing the forward displacement can be improved, and the body pressure dispersibility of the cut pattern can be further improved.

  A through-hole penetrating in the thickness direction of the second resin layer or a side facing the first resin layer is opened in a region between adjacent linear through-cut grooves of the notch pattern, and a non-penetrating hole that does not penetrate the second resin layer. It is also preferable to provide a through hole. Thereby, the valve has a small apparent hardness and is easily elastically deformed toward the hole so as to cover at least a part of the opening edge of the hole of the first resin layer and / or the inner wall of the hole. At the same time, the variation in the size of the body pressure dispersibility can be increased, so that the effect of suppressing forward slippage can be further improved in a state where the body pressure at the anchor point is low. The range of needs can be expanded.

  According to the present invention, there is further provided a cushion material having a structure in which a second resin layer is laminated on a first resin layer. The first resin layer has at least one bottomed or non-bottomed hole, and the second resin layer has an opening at least in a region facing the hole, the side facing the first resin layer, and the second resin layer has a second opening. There is provided at least one non-penetrating notch pattern which is constituted by at least three linear non-penetrating cut grooves which do not penetrate the resin layer and intersect each other at a predetermined intersection. The inter-groove region between adjacent linear non-penetrating cut grooves of the non-penetrating cut pattern and the periphery of the inter-groove region continuous with the inter-groove region are configured to be elastically deformable. At least a part of the opening edge of the hole of the first resin layer and / or the inner wall of the hole when the load in the vertical direction acts on the non-penetrating cut pattern in the inter-groove region and / or the periphery of the inter-groove region. Is configured to elastically deform toward the hole so as to cover the hole.

  In the cushioning material of the present invention, the first resin layer has a hole, and the second resin layer laminated thereon is constituted by at least three cut grooves which do not penetrate in the thickness direction and cross each other. It has a non-penetrating cut pattern. When a vertical load is applied to the non-penetrating cut pattern, the adjacent inter-groove region of the non-penetrating cut pattern and the peripheral portion of the inter-groove region become open edges and / or holes of the holes in the first resin layer. It elastically deforms toward the hole so as to cover at least a part of the inner wall of the part. As a result, the inter-groove region and the periphery of the inter-groove region curve downward to cover the opening edge of the hole and the periphery of the opening edge. In addition to the fact that the width of the adjacent inter-groove region is increased due to the curved deformation of the inter-groove region and the ratio of the gap is increased, the body pressure of the occupant is well dispersed, and the peripheral portion of the ischium is supported. Are stably supported, and sitting stability is improved. In addition, when a forwardly displaced horizontal load is applied, at least a part of the front opening edge and / or the inner wall of the hole (anchor point) while maintaining the above-described body pressure dispersibility and sitting stability. ), The curved inter-groove region and the periphery of the inter-groove region flexibly contact and support the front edge of the sciatic bone of the occupant, so that the forward movement of the sciatic bone is moderately suppressed, and the contact with the anchor point is achieved. The forward displacement is effectively suppressed without the inconvenience that the blood pressure is suddenly increased and the blood flow is locally blocked. As described above, according to the cushioning material of the present invention, the predetermined body pressure dispersing performance can be maintained, and further, both the sitting position stability and the effect of suppressing forward displacement can be improved.

  It is preferable that the hole of the first resin layer is formed of a bottomless hole penetrating the first resin layer. Thereby, the sitting stability can be further improved.

  A third resin layer laminated on a surface of the second resin layer opposite to the first resin layer, the third resin layer being opposite to a surface facing the second resin layer; May have a large number of block elements defined by non-through grooves having openings in the surface, and the non-through grooves may be formed deeper in a portion where a vertical load acting on the third resin layer is larger. preferable. Thereby, body pressure dispersibility can be further improved.

  It is also preferable that the first resin layer further includes a base layer made of resin laminated on the surface of the first resin layer opposite to the second resin layer. Thereby, the mechanical strength of the cushion material can be increased, and the risk of bottoming in the thickness direction can be reduced.

  In this case, at least one of the first resin layer, the second resin layer, and the base layer is formed of a resin foam, which is harder than the resin forming each layer, at both ends in the front-rear direction of the cushion material. It is also preferable that a hard portion is provided. Thereby, the mechanical strength of the both ends of the cushion material is further increased, and the stability in the left-right direction in the sitting posture of the user is improved, so that a more stable sitting posture can be maintained.

  It is also preferable that an adhesive layer is interposed between at least the first resin layer and the second resin layer. Accordingly, the gap between the first resin layer and the second resin layer is fixed, so that the displacement between the two layers can be reliably suppressed. An adhesive layer may be interposed between the second resin layer and the third resin layer and / or between the base layer and the first resin layer.

  It is also preferable that at least one of the first resin layer, the second resin layer, and the base layer is formed of a resin foam or a three-dimensional network structure. As a result, it is possible to expand the variation in the need for the body pressure dispersion performance of the cushion material. The third resin layer may be formed of a resin foam or a three-dimensional network structure.

  It is also preferable that the cushioning material is a cushioning material for a wheelchair seat, a mattress cushioning material, or a cushioning material for a vehicle seat. If the cushioning material is applied to the mattress, a predetermined body pressure dispersibility is maintained when lying down on the mattress or when sitting, thereby improving the sitting position stability and suppressing the forward slippage. In this case, it is possible to suppress the collapse of a predetermined recumbent posture or a sitting posture, and particularly to prevent a mattress having a backrest function from moving forward when the backrest is raised.

  According to the present invention, the protruding piece and the protruding piece area peripheral portion are curved downward to cover at least a part of the opening edge of the hole and / or the inner wall of the hole, so that the peripheral portion of the ischium is curved downward. The occupant is supported by the protruding piece and the periphery of the protruding piece area, and further, the curved portion of the protruding piece portion expands the space between adjacent protruding pieces (width of the cut portion) to increase the ratio of the gap between the protruding pieces. The body pressure is well dispersed, and the periphery of the ischium is stably supported, thereby improving the sitting stability. Moreover, when a forwardly displaced horizontal load is applied, at least a part of the front opening edge and / or the inner wall of the hole (anchor point) while maintaining the above-described body pressure dispersibility and sitting stability. ), The curved protruding piece and the periphery of the protruding piece area flexibly contact and support the front edge of the sciatic bone of the seated person, so that the forward movement of the sciatic bone is moderately suppressed, and the contact pressure with the anchor point is reduced. Is prevented from rising so rapidly that the blood flow is locally blocked, and the forward displacement is effectively suppressed. As described above, according to the cushioning material of the present invention, the predetermined body pressure dispersing performance can be maintained, and further, both the sitting position stability and the effect of suppressing forward displacement can be improved.

  Further, according to the present invention, since the inter-groove region and the periphery of the inter-groove region are curved downward to cover the opening edge of the hole and the periphery of the opening edge, the periphery of the ischium is curved downward. And by supporting the periphery of the inter-groove region, the width of the adjacent inter-groove region is expanded with the curved deformation of the inter-groove region, and the ratio of the voids is increased, so that the body pressure of the occupant is dispersed well. In addition, the periphery of the ischium is stably supported, and the sitting position stability is improved. In addition, when a forwardly displaced horizontal load is applied, at least a part of the front opening edge and / or the inner wall of the hole (anchor point) while maintaining the above-described body pressure dispersibility and sitting stability. ), The curved inter-groove region and the periphery of the inter-groove region flexibly contact and support the front edge of the sciatic bone of the occupant, so that the forward movement of the sciatic bone is moderately suppressed, and the contact with the anchor point is achieved. The forward displacement is effectively suppressed without the inconvenience that the blood pressure is suddenly increased and the blood flow is locally blocked. As described above, according to the cushioning material of the present invention, the predetermined body pressure dispersing performance can be maintained, and further, both the sitting position stability and the effect of suppressing forward displacement can be improved.

It is an exploded perspective view showing roughly composition of a cushion material in one embodiment of the present invention. FIG. 2 is an exploded perspective view schematically illustrating a configuration of a first resin layer and a second resin layer, which are main components of the cushion material of the embodiment of FIG. 1. FIG. 2 is a perspective view schematically showing a configuration of a first resin layer and a second resin layer, which are main components of the cushion material of the embodiment of FIG. 1. FIG. 6 is a sectional view taken along line AA of FIG. 5. It is a top view which shows roughly the structure at the time of the non-deformation and the deformation of the 2nd resin layer of the cushion material of embodiment of FIG. It is a top view which shows the example of a change of the combination of the hole part and the cutting pattern in the cushion material of embodiment of FIG. It is a top view which shows the example of a change of the cut pattern in the cushion material of embodiment of FIG. It is a top view which shows the example of a change of the cut pattern in the cushion material of embodiment of FIG. It is a top view which shows the example of a change of the cut pattern in the cushion material of embodiment of FIG. It is a top view which shows the example of a change of the cut pattern in the cushion material of embodiment of FIG. It is a top view which shows the example of a change of the cut pattern in the cushion material of embodiment of FIG. It is a top view which shows the example of a change of the cut pattern in the cushion material of embodiment of FIG. It is a top view which shows the example of a change of the hole part in the cushion material of embodiment of FIG. FIG. 2 is a diagram for explaining the function and effect of the cushion material of the embodiment in FIG. 1. FIG. 2 is a diagram for explaining the function and effect of the cushion material of the embodiment in FIG. 1. FIG. 4 is a diagram for explaining the operation and effect of a modification of the embodiment in FIG. 1. It is the top view and sectional drawing which show the structure of the cushion material of embodiment of FIG. 1, and its modification. It is a perspective view which shows the example which applied the cushioning material of embodiment of FIG. 1 to the seat surface of a wheelchair. It is an exploded perspective view showing roughly composition of a cushion material in other embodiments of the present invention. It is a top view and a side view showing the shape and size of the 1st resin layer in Example 1 of the cushioning material of the present invention. It is the top view and side view which show the shape and dimension of the 2nd resin layer in Example 1 of the cushioning material of this invention. It is a top view, a front view, and a side view showing shape and size of the 3rd resin layer in Example 1 of the cushioning material of the present invention. It is a schematic diagram explaining the structure of the 1st measuring device for comparative tests in Example 1, Comparative Example 1, and Comparative Example 2 of the cushioning material of the present invention. It is a characteristic view which shows the measurement result of the front displacement force in Example 1, Comparative Example 1, and Comparative Example 2 of the cushion material of the present invention. It is a pressure characteristic figure which shows body pressure dispersibility in Example 1, Comparative Example 1, and Comparative Example 2 of the cushion material of the present invention. It is a pressure characteristic figure which shows the body pressure dispersibility of the anchor point in Example 1 of the cushion material of this invention, and Comparative Example 2.

  Hereinafter, the cushioning material of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a configuration of a cushioning material according to an embodiment of the present invention. FIGS. 2 and 3 show a first resin layer and a second resin layer which are basic configurations of the cushioning material of the embodiment. FIG. 4 schematically shows a cross section taken along line AA of FIG. 5, and FIG. 5 shows a configuration of the second resin layer of the cushion material according to the present embodiment when it is not deformed and when it is deformed. Is schematically shown.

  As shown in these figures, the cushioning material 10 according to the present embodiment includes a first resin layer via a bonding layer as needed on a base layer 11 made of a resin foam such as a polyurethane resin. A (sciatic storage layer) 12 is laminated, a second resin layer (sciatic support layer) 13 is necessarily laminated on the first resin layer 12 via an adhesive layer, and a second resin layer 13 is laminated on the second resin layer 13. A third resin layer (body pressure dispersion applying layer) 14 is laminated via an adhesive layer as necessary.

  The base layer 11 is formed by, for example, molding a resin foam such as a polyurethane resin into a flat plate shape, and is provided to increase the mechanical strength of the cushioning material and prevent a seated person from bottoming. As the base layer 11, in addition to the polyurethane resin foam, a polyethylene resin foam, a polyolefin resin foam, a silicone resin foam, or the like can be used. Further, the base layer 11 may be constituted by using a three-dimensional net-like structure, a hard cotton or a soft resin made of resin, or the like instead of the resin foam.

  The first resin layer 12 has at least one (one in this embodiment) bottomed (non-penetrating) or non-bottomed (penetrating) hole portion 12a. The hole 12a is formed by punching out a hole 12a by punching or the like, and is provided to stably support a seated part of a seated person and to form an anchor point for suppressing forward slippage. The hole portion 12a is formed by punching a flat resin foam when the hole has no bottom, and when the hole has a bottom, the first resin layer 12 is foamed in a mold. It is formed by a method, a method of laminating and fixing a flat resin foam having a bottomless hole penetrating the flat resin foam. In the present embodiment, the planar shape of the hole 12a is configured to be two circular shapes (true circles or ellipses) partially overlapping as illustrated. However, the planar shape is not limited to this shape as long as it can support the seated part of the seated person, and various shapes can be applied as described later. Further, the shape of the inner wall 12c of the hole 12a may be formed such that the shape of the hole in the plan view of the first resin layer 12 is constant in the thickness direction. It may be formed to change to a non-similar shape. As the first resin layer 12, in addition to the polyurethane resin foam, a polyethylene resin foam, a polyolefin resin foam, a silicone resin foam, or the like can be used. Further, the first resin layer 12 may be constituted by using a three-dimensional net-like structure, a hard cotton or a soft resin made of resin instead of the resin foam.

  The second resin layer 13 is provided with at least one (two in this embodiment) cut pattern 13a in a region facing the hole 12a of the first resin layer 12, and is made of a resin foam such as a polyurethane resin. The cut pattern 13a is cut out by punching or the like into a flat plate shape, and is provided for supporting the seated part of the seated person and dispersing the pressure of the anchor point. As the second resin layer 13, a polyethylene resin foam, a polyolefin resin foam, a silicone resin foam, or the like can be used in addition to the polyurethane resin foam. Further, the second resin layer 13 may be configured using a three-dimensional network structure instead of the resin foam.

  Each cut pattern 13a is constituted by at least three (eight in the present embodiment) linear through cut grooves 13b that penetrate in the thickness direction of the second resin layer 13 and intersect with each other at a predetermined intersection. ing. That is, the linear through cut groove 13b of the cut pattern 13a radially extends from the intersection thereof as a starting point, and the terminal end is present in a region inside the hole 12a of the first resin layer. In the present embodiment, these linear through-cut grooves 13b are formed by through slits. In this way, by forming the through-slits, when a load is applied, the protruding piece and the protruding piece area peripheral portion cover the opening edge 12b of the hole 12a and / or the inner wall 12c of the hole 12a so as to be downward. Since it is easy to bend easily, the effects of the present invention can be efficiently exhibited. Further, the linear through-cut groove 13b can be efficiently and stably formed. Further, the linear through-cut groove 13b may have any form as long as it can form a cantilever-like cantilever-like protrusion by the linear through-cut grooves 13b adjacent to each other, and the line shape and the line width are limited. Examples include straight, wavy, arcuate, and other curved shapes, and forms in which the line width is constant or changes in the length direction.

  In the present embodiment, the two cut patterns 13a are line-symmetric with respect to a center line (not shown). Also, it has been described that each cut pattern 13a has eight linear through cut grooves 13b, but the present invention is not limited to this number, and as long as the effects of the present invention are exerted, as described below, The cut pattern can be configured to have three to seven, or nine or more, concentrically intersecting linear through cut grooves. Further, one of the two cut patterns may be formed to be non-linearly symmetric with respect to a center line (not shown) by rotating the one of the two cut patterns with respect to the center.

  The two cut patterns 13a in the present embodiment are arranged at different positions in a region of the first resin layer 12 facing the hole 12a. Thereby, the followability of the user to the buttocks shape is improved, so that the body pressure dispersibility and the sitting position stability of the cushioning material can be further improved. In this case, the distance between the intersections of the linear through-cut grooves 13b in the two cut patterns 13a is desirably 110 to 140 mm. Accordingly, the position of the ischial bones of the human body based on the statistical database or the like can be accurately reflected on the position of the intersection of the linear through-cut grooves 13a of the second resin layer 13, thereby suppressing the forward displacement of the occupant. Can be more accurately improved.

  As clearly shown in FIG. 5 (A), the second resin layer 13 includes a cantilever-shaped protruding piece 13c formed of a region between adjacent linear through-cut grooves 13b of each of the cut patterns 13a and the protruding piece 13c. A protruding portion peripheral portion 13d continuous with the base of the piece 13c is configured to be elastically deformable (hereinafter, the cantilever-shaped protruding portion 13c is referred to as a valve 13c, and a protruding portion region peripheral portion 13d is referred to as a valve peripheral portion 13d. Abbreviated). In the present embodiment, eight valves 13c and a valve peripheral portion 13d are formed by the eight linear through-cut grooves 13b. As a result, when a load in the vertical direction acts on the cut pattern 13a (when the user is seated in the vertical direction, the same applies hereinafter), the valve 13c and the valve peripheral portion 13d form the hole 12a of the first resin layer 12. Elastically deforms toward the hole 12a so as to cover the opening edge 12b of the hole 12a and / or the inner wall 12c of the hole 12a, and furthermore, a load (stress) due to a forward displacement in the direction of the opening edge 12b and / or the inner wall 12c of the hole 12a. ) Acts, the valve 13c and / or the valve peripheral portion 13d are pressed and deformed in the direction of the opening edge 12b and / or the inner wall 12c of the hole 12a, and in particular, at least a part of the front opening edge 12b and / or the inner wall 12c. Is configured to support the load while covering the anchor point 12d composed of.

  The length of the linear through-cut groove 13b is desirably set to 20 mm or more. With this setting, when a load in the vertical direction acts on the cut pattern 13a, the valve 13c and the valve peripheral portion 13d are elastically deformed toward the hole 12a. As shown in FIG. 5 (B), the deformation between the adjacent valves (width of the cut portion) is increased and the ratio of the gap between the valves is increased, whereby the body pressure of the occupant is well dispersed. At the same time, the periphery of the ischium is stably supported, and the sitting position stability is easily improved. Further, when a load (stress) due to a forward shift acts in the direction of the opening edge 12b and / or the inner wall 12c of the hole 12a, at least a part (anchor point) of the front opening edge and / or the inner wall of the hole 12a is covered. Since the curved valve and the valve periphery flexibly abut and support the front edge of the seated sciatic, forward movement of the sciatic bone is gently suppressed, and the contact pressure with the anchor point rises sharply, causing blood flow. Does not occur locally, and the effect of effectively suppressing forward slippage can be easily obtained.

  The third resin layer 14 is partitioned by a large number of non-through grooves 14a having openings on the surface opposite to the surface facing the second resin layer 13 on the upper surface of a resin foam such as a polyurethane resin. It is formed by forming a large number of block elements 14b, and is provided to satisfactorily disperse the body pressure of the occupant. Such a structure of the third resin layer 14 is known, for example, in Patent Documents 1 and 2. As the third resin layer 14, in addition to the polyurethane resin foam, a polyethylene resin foam, a polyolefin resin foam, a silicone resin foam, or the like can be used. Further, the third resin layer 14 may be constituted by using a three-dimensional net-like structure, a hard cotton or a soft resin made of resin instead of the resin foam.

  The base layer 11 and the first resin layer 12 do not necessarily need to be fixed to each other. In the case of fixing, an adhesive layer is provided on only the front surface or only a part of the space between them, by applying an adhesive or attaching an adhesive film, and fixed. The first resin layer 12 and the second resin layer 13 are fixed to each other. An adhesive layer is provided and fixed by applying an adhesive or attaching an adhesive film to only the front surface or only a part between them. The second resin layer 13 and the third resin layer 14 do not necessarily need to be fixed to each other. In the case of fixing, an adhesive layer is provided and fixed by applying an adhesive or attaching an adhesive film to only the front surface or only a part between the two. By fixing between the base layer 11 and the first resin layer 12, between the first resin layer 12 and the second resin layer 13, and between the second resin layer 13 and the third resin layer 14 with an adhesive layer, The displacement between the layers can be reliably suppressed.

  In the present embodiment, in the cut pattern 13a, the linear cut groove is a through groove, but the linear cut groove may be a non-through groove as described later (see FIG. 17). When the linear cut groove is a through groove, the cut pattern 13a is formed by punching a flat resin foam, and when the linear cut groove is a non-through groove, the cut pattern is non-penetrating It is formed by half-cutting to press in a suitable state, or by laminating and fixing a flat resin foam having a through groove on the flat resin foam.

  In the present embodiment, the cushion material 10 has a four-layer structure in which the base layer 11, the first resin layer 12, the second resin layer 13, and the third resin layer 14 are laminated on each other. The cushioning material of the present invention only needs to have a basic structure in which a first resin layer (sciatic storage layer) 12 and a second resin layer (sciatic support layer) 13 are laminated on each other via an adhesive layer. Further, the base layer 11, the first resin layer 12, the second resin layer 13, and the third resin layer 14 have a flat plate shape with a constant thickness. The thickness may be different.

  FIG. 6 shows a modified example of the combination of the hole and the cut pattern in the cushion material of the present embodiment, and FIG. 7 shows a modified example of the cut pattern in the cushion material of the present embodiment.

  As shown in FIG. 6A, at positions different from each other in a region facing one hole 22a (substantially rectangular shape in this example) of the first resin layer, the shape is line-symmetric with respect to a center line (not shown). Some two cut patterns 23a may be provided. In this case, two notch patterns 23a are provided at positions facing the sit bones of the occupant in the two regions obtained by dividing the hole 22a into two. Although not shown, three cut patterns may be provided at positions facing three regions obtained by dividing one hole into three portions (however, two cut patterns are positions facing the sit bone of the seated person). Provided). As a result, the number of cut patterns provided in the second resin layer increases, and the position of the intersection of these cut patterns and the position of the ischial of the occupant can be more appropriately matched. The effect of improving the body pressure dispersion performance of the seated person and the effect of suppressing the forward displacement of the seated person can be further improved by precisely corresponding to the body shape of each individual. Further, as shown in FIG. 6B, the shape which is symmetrical with respect to the center line (not shown) is formed in the region opposed to each of the two holes 32a (substantially rectangular shape in this example) of the first resin layer. Two cut patterns 33a may be provided respectively. In this case, two cut patterns 33a are respectively provided at different positions (positions facing the seated bones of the occupant) in the region facing the two holes 32a. Further, as shown in FIG. 6C, one cut pattern 43a may be provided in a region facing one hole 42a (substantially rectangular shape in this example) of the first resin layer. In this case, one cut pattern 43a provided at a position facing the center of the hole 42a is provided. Further, as shown in FIG. 6 (D), one cut pattern 53a is provided so as to partially cover a region facing one hole 52a (a band shape in this example) of the first resin layer. Is also good. Further, as shown in FIG. 6 (E), three notch patterns 63a may be provided in regions respectively facing the three hole portions 62a (in this example, substantially rectangular shapes) of the first resin layer. In this case, three notch patterns 63a are respectively provided at different positions in a region facing the three hole portions 62a. However, two of the cut patterns have a line-symmetrical shape with respect to a center line (not shown), and are provided at positions facing the seat bones of the seated person. Thereby, the variation of the form of the cut pattern can be increased, and the position of the intersection of the linear through-cut groove of the cut pattern can be more accurately and precisely determined according to the individual difference in the position of the seat bone and the coccyx of the seated person. It can be adapted, and the effect of improving the body pressure dispersion performance of the seated person and the effect of suppressing the forward displacement of the seated person can be further improved.

  Further, as shown in FIG. 7A, the cut pattern includes a through hole penetrating in the thickness direction of the second resin layer at an intersection 73e where eight linear through cut grooves 73b formed by the through slits intersect and concentrate. May be provided. Also, as shown in FIG. 7B, a through-hole penetrating in the thickness direction of the second resin layer is provided at an intersection 83e where eight linear through-cut grooves 83b formed by wide through slits intersect and concentrate. It may be constituted by. By providing the through holes, the ratio of the voids in the cut pattern area increases, so that the body pressure dispersion performance at the time of sitting can be further improved.

  FIG. 8 shows a modified example of the cut pattern in the cushion material of the present embodiment. Each of the cut patterns shown in the figure is a case where the number of valves is three.

  As shown in FIG. 8 (A), the cut pattern may be two cut patterns 93a that are line-symmetric with each other and in which three linear cut grooves formed by the through slits intersect at the intersection. . As shown in FIG. 8 (B), three linear through-cut grooves formed by the through slits intersect and concentrate at the intersection, and a through hole penetrating in the thickness direction of the second resin layer is formed at the intersection. Two cut patterns 103a having a line-symmetrical shape may be provided. Further, as shown in FIGS. 8 (C) and 8 (D), three linear through-cut grooves formed by the through slits widen and intersect with each other at the intersections, and intersect at the intersections in the thickness direction of the second resin layer. And two cut patterns 113a and 123a which are symmetrical with each other and have through holes penetrating therethrough. Furthermore, as shown in FIG. 8 (E), two cut patterns 133 a having a line-symmetric shape with each other, in which three linear cut grooves formed by wide through slits converge and intersect at the intersection. good. Further, as shown in FIG. 8 (F), three linear through-cutting grooves formed by the through slits widen and intersect at the intersections, and penetrate through the intersections in the thickness direction of the second resin layer. And a through hole penetrating in the thickness direction of the second resin layer or a side facing the first resin layer is opened in a region between the adjacent linear through cut grooves, and a non-penetration that does not penetrate the second resin layer. Two cut patterns 143a each having a hole and having a line-symmetrical shape may be provided. By providing such a cut pattern 143a, the valve has a reduced apparent hardness, and the valve is formed in the hole so as to cover at least a part of the opening edge of the hole of the first resin layer and / or the inner wall of the hole. It is easy to be elastically deformed and the variation of the size of the body pressure dispersibility can be increased, so that the effect of suppressing forward slippage can be further improved when the body pressure at the anchor point is low, and the cushion The range of needs for body pressure dispersion performance for the material can be expanded.

  In addition, as shown in FIG. 8 (G), the notch pattern is such that three linear through-cut grooves 153b formed by the through slits intersect and concentrate at the intersection, and the intersecting portion of the linear through-cut groove 153b is the center. Two cut patterns 153a having a plurality of concentric polygonal shapes (concentric triangular shape in the present embodiment) non-penetrating cut grooves 153f that do not penetrate the second resin layer to be formed may be line-symmetrical to each other. . Further, as shown in FIG. 8 (H), three linear through-cutting grooves 163b formed by the through-slits widen and intersect at the intersection, and penetrate through the intersection in the thickness direction of the second resin layer. A plurality of concentric polygonal (in this embodiment, concentric triangular) non-penetrating cut grooves 163f which are provided with holes and do not penetrate the second resin layer around the intersection of the linear penetrating cut grooves 163b. Alternatively, two cut patterns 163a having line-symmetric shapes may be used. Furthermore, as shown in FIG. 8 (I), three linear through-cutting grooves 173b formed by the through slits widen and intersect at the intersection, and penetrate the intersection in the thickness direction of the second resin layer. A plurality of concentric non-penetrating cut grooves 173f that do not penetrate the second resin layer and center around the intersection of the linear penetrating cut grooves 173b; One cut pattern 173a may be used. By providing the cut pattern 153a, 163a, or 173a as described above, when a load in the vertical direction is applied to the cut pattern, the valve is easily bent and deformed, and the apparent hardness is reduced. Easily covers at least a portion of the opening edge 12b and / or the inner wall 12c of the hole 12a, and furthermore, the body pressure is low when a load (stress) due to a forward shift acts in the direction of the opening edge 12b and / or the inner wall 12c of the hole 12a. Since it can be supported in a state, the reliability of the effect of suppressing the forward displacement can be improved, and the apparent hardness of the cut pattern can be reduced, so that the body pressure dispersibility at the anchor point can be further improved.

  Further, as shown in FIG. 8 (J), the cut patterns are two cut patterns 183a having a line-symmetric shape with each other, in which three linear through cut grooves 183b formed by wide through slits intersect at the intersection. And a plurality of straight through cut grooves formed parallel to a straight line connecting the intersections of these two cut patterns 183a and separated from the intersections by a predetermined distance, and penetrating the second resin layer or A configuration may be provided that includes a linear non-penetrating cut groove 183g that does not penetrate the second resin layer. By providing such a cut pattern 183a and a straight through cut groove or a straight non-through cut groove 183g, the valve and the valve peripheral portion are easily bent and deformed, and the apparent hardness is also reduced. It is easy to cover at least a part of the opening edge 12b and / or the inner wall 12c of the hole 12a, and even if a load is applied in the direction of the opening edge 12b and / or the inner wall 12c of the hole 12a, it can be supported in a state where the body pressure is low. The effect of suppressing forward slippage and the dispersibility of body pressure can be further improved at the same time. Further, the position of the intersection of the linear through-cut groove or the linear non-through-cut groove 183b and the position of the sciatic bone of the occupant are more appropriately and precisely opposed to each other in accordance with the data of the sciatic position of the human body. It is possible to create a tailor-made cushioning material that matches the body shape of each individual, and to improve the effect of dispersing the body pressure of the occupant and to suppress the forward displacement of the occupant. Can be further improved. When a plurality of straight through cut grooves 183g penetrating through the second resin layer are provided, it is desirable to have a configuration in which some valves of the cut pattern 183a do not fall off. Further, the straight non-through cut grooves 153f, 163f, 173f and 183g formed in FIGS. 8 (G) to 8 (J) may be formed on the surface side of the second resin layer, It may be formed on the side facing 12a. Instead of these straight non-penetrating cut grooves 153f, 163f, 173f and 183g, curvilinear or arc-shaped curved non-penetrating cut grooves may be used.

  FIG. 9 shows a modified example of the cut pattern in the cushion material of the present embodiment. Each of the cut patterns shown in the figure is for the case where the number of valves is four.

  As shown in FIGS. 9A and 9B, the cut patterns are two cut patterns having a line-symmetric shape with each other, in which four linear through cut grooves formed by wide through slits intersect at the intersection. 193a and 203a. Further, as shown in FIGS. 9C and 9D, two linearly symmetrical cuts, in which four linear through cut grooves 213b and 223b formed by wide through slits are concentrated and intersect at the intersection. A plurality of patterns 213a and 223a, which are formed at positions parallel to a straight line connecting the intersections of the two cut patterns 213a and 223a and are separated from the intersections by a predetermined distance, and penetrate the second resin layer. The embodiment may be provided with straight through cut grooves or straight non-through cut grooves 213g and 223g that do not penetrate the second resin layer. By providing such cut patterns 213a and 223a and straight through cut grooves or straight non-through cut grooves 213g and 223g, the valve and the valve peripheral portion are easily bent and deformed, and the apparent hardness is also lowered. It is easy to cover at least a part of the opening edge 12b and / or the inner wall 12c of the hole 12a, and the body pressure is low even when a load acts on the opening edge 12b and / or the inner wall 12c of the hole 12a. Since it can be supported, the effect of suppressing forward slippage and the dispersibility of body pressure can be further improved simultaneously. Furthermore, the position of the intersection of the linear through cut groove or the linear non-through cut groove 213g and 223g and the position of the sciatic bone of the occupant are more appropriately and precisely opposed to each other according to the data of the sciatic position of the human body. As a result, it is possible to fabricate a customized cushioning material that matches the body shape of each individual, and to improve the body pressure dispersion performance of the occupant and the effect of suppressing the forward displacement of the occupant. Can be further improved in accordance with the body shape of the subject. When a plurality of straight through cut grooves 213g and 223g penetrating through the second resin layer are provided, it is desirable to have a configuration in which some valves of the cut patterns 213a and 223a do not fall off. 9 (C) and 9 (J) may be formed on the surface side of the second resin layer, or may face the holes 12a. It may be formed on the side. Further, instead of these straight non-penetrating cut grooves 213g and 223g, curvilinear or arcuate curved non-penetrating cut grooves may be used.

  FIG. 10 shows a modified example of the cut pattern in the cushion material of the present embodiment. Each of the cut patterns shown in the figure is for the case where the number of valves is six.

  As shown in FIG. 10 (A), the cut patterns may be two cut patterns 233a having a line-symmetrical shape with each other, in which six linear through cut grooves formed by the through slits intersect at the intersection. . Further, as shown in FIG. 10B, six linear through-cut grooves formed by the through slits are concentrated and intersect at the intersection, and a through-hole penetrating in the thickness direction of the second resin layer is formed at the intersection. Two cut patterns 243a having a line-symmetrical shape may be provided. Further, as shown in FIG. 10 (C), six linear through-cut grooves formed by the through slits widen and intersect at the intersection, and the through-hole penetrates the intersection in the thickness direction of the second resin layer. May be provided, and two cut patterns 253a which are symmetrical with each other. Further, as shown in FIG. 10 (D), six linear through-cut grooves formed by the through slits widen and intersect at the intersection, and penetrate through the intersection in the thickness direction of the second resin layer. And two cut patterns 263a having a non-linear symmetry with each other. That is, by forming one of the two cut patterns in a shape rotated with respect to the center thereof, the cut pattern may be configured to be non-linearly symmetric with respect to a center line (not shown). Furthermore, as shown in FIG. 10 (E), two cut patterns 273 a having a line-symmetrical shape with each other, where six linear cut grooves formed by wide through slits intersect and concentrate at the intersection. good. Further, as shown in FIG. 10 (F), six linear through-cutting grooves formed by the through slits widen and intersect at the intersections, and penetrate through the intersections in the thickness direction of the second resin layer. And a through hole penetrating in the thickness direction of the second resin layer or a side facing the first resin layer is opened in a region between the adjacent linear through cut grooves, and a non-penetration that does not penetrate the second resin layer. Two cut patterns 283a having holes and having a line-symmetrical shape may be provided. By providing such a cut pattern 283a, the valve has a small apparent hardness, and the valve is formed in the hole so as to cover at least a part of the opening edge of the hole of the first resin layer and / or the inner wall of the hole. It is easy to be elastically deformed and the variation of the size of the body pressure dispersibility can be increased, so that the effect of suppressing forward slippage can be further improved when the body pressure at the anchor point is low, and the cushion The range of needs for body pressure dispersion performance for the material can be expanded.

  Also, as shown in FIG. 10 (G), the notch pattern is such that six linear through-cut grooves 293b formed by the through slits intersect and concentrate at the intersection, and the center of the cut pattern is at the intersection of the linear through-cut grooves 293b. Two cut patterns 293a having a plurality of concentric polygonal shapes (in this embodiment, concentric hexagonal shape) non-penetrating cut grooves 293f that do not penetrate the second resin layer to be formed may be line-symmetrical to each other. . Further, as shown in FIG. 10 (H), six linear through-cut grooves 303b formed by the through slits widen and intersect at the intersection, and penetrate through the intersection in the thickness direction of the second resin layer. A plurality of concentric polygonal (in the present embodiment, concentric hexagonal) non-through cutout grooves 303f which are provided with holes and do not penetrate the second resin layer around the intersection of the linear through cutout grooves 303b. Alternatively, two cut patterns 303a having a line-symmetrical shape may be used. Furthermore, as shown in FIG. 10 (I), six linear through-cutting grooves 313b formed by the through slits widen and intersect at the intersection, and penetrate the intersection in the thickness direction of the second resin layer. A plurality of concentric non-penetrating cut grooves 313f that are provided with through-holes and do not penetrate the second resin layer around the intersection of the linear penetrating cut grooves 313b; One cut pattern 313a may be used. By providing the cut patterns 293a, 303a, or 313a as described above, when a load in the vertical direction is applied to the cut pattern, the valve is easily bent and deformed, and the apparent hardness is reduced. Easily covers at least a portion of the opening edge 12b and / or the inner wall 12c of the hole 12a, and furthermore, the body pressure is low when a load (stress) due to a forward shift acts in the direction of the opening edge 12b and / or the inner wall 12c of the hole 12a. Since it can be supported in a state, the reliability of the effect of suppressing the forward displacement can be improved, and the apparent hardness of the cut pattern can be reduced, so that the body pressure dispersibility at the anchor point can be further improved.

  Further, as shown in FIG. 10 (J), the cut patterns are two cut patterns 323a having a line-symmetric shape with each other, in which six linear through cut grooves 323b formed by wide through slits intersect at the intersection. And a plurality of straight through cut grooves formed parallel to a straight line connecting the intersections of these two cut patterns 323a and separated from the intersections by a predetermined distance, and penetrating the second resin layer. A configuration may be provided that includes a straight non-penetrating cut groove 323g that does not penetrate the second resin layer. By providing such a cut pattern 323a and a straight through cut groove or a straight non-through cut groove 323g, the valve and the valve peripheral portion are easily bent and deformed, and the apparent hardness is also reduced. Easily covers at least a part of the opening edge portion 12b and / or the inner wall 12c of the hole 12a, and is supported in a state where the body pressure is low even when a load due to a forward shift acts in the direction of the opening edge portion 12b and / or the inner wall 12c of the hole portion 12a. Therefore, the effect of suppressing forward slippage and the dispersibility of body pressure can be further improved at the same time. Furthermore, the position of the intersection of the linear through-cut groove or the linear non-through-cut groove 323b and the position of the sciatic bone of the occupant are more appropriately and precisely opposed to each other according to the data of the sciatic position of the human body. It is possible to create a tailor-made cushioning material that matches the body shape of each individual, and to improve the effect of dispersing the body pressure of the occupant and to suppress the forward displacement of the occupant. Can be further improved. When a plurality of straight through cut grooves 323g penetrating through the second resin layer are provided, it is desirable to have a configuration in which some valves of the cut pattern 323a do not fall off. Further, the straight non-penetrating cut grooves 293f, 303f, 313f, and 323g formed in FIGS. 10G to 10J may be formed on the surface side of the second resin layer, or may be formed as holes. It may be formed on the side facing 12a. Instead of these straight non-penetrating cut grooves 293f, 303f, 313f and 323g, curvilinear or arcuate curved non-penetrating cut grooves may be used.

  FIG. 11 shows a modified example of the cut pattern in the cushion material of the present embodiment. Each of the cut patterns shown in the figure is for the case where the number of valves is eight.

  As shown in FIG. 11 (A), the cut patterns may be two cut patterns 333a having a line-symmetric shape with each other, where eight linear cut grooves formed by the through slits intersect at the intersection. . In addition, as shown in FIG. 11B, eight linear through-cut grooves formed by the through slits intersect and concentrate at the intersection, and a through hole penetrating in the thickness direction of the second resin layer is formed at the intersection. Two cut patterns 343a having a shape symmetrical with each other may be provided. Further, as shown in FIG. 11 (C), eight linear through-cutting grooves formed by the through slits widen and intersect at the intersections, and penetrate through the intersections in the thickness direction of the second resin layer. May be provided, and two cut patterns 353a which are line-symmetrical to each other. Further, as shown in FIG. 11 (D), eight linear through-cut grooves formed by the through slits widen and intersect with each other at the intersections, and penetrate through the intersections in the thickness direction of the second resin layer. May be provided, and two cut patterns 353a that are non-linearly symmetric to each other. That is, by forming one of the two cut patterns in a shape rotated with respect to the center thereof, the cut pattern may be configured to be non-linearly symmetric with respect to a center line (not shown). Further, as shown in FIG. 11 (E), two cut patterns 373 a having a line-symmetrical shape with each other, in which eight linear cut grooves formed by wide through slits are concentratedly intersected at the intersection. good. Further, as shown in FIG. 11 (F), eight linear through-cutting grooves formed by the through slits widen and intersect at the intersections, and the through holes penetrate through the intersections in the thickness direction of the second resin layer. And a through hole penetrating in the thickness direction of the second resin layer or a side facing the first resin layer is opened in a region between the adjacent linear through cut grooves, and a non-penetration that does not penetrate the second resin layer. Two cut patterns 383a having holes and having a line-symmetrical shape may be provided. By providing such a cut pattern 383a, the valve has a reduced apparent hardness, and the valve is formed in the hole so as to cover at least a part of the opening edge of the hole of the first resin layer and / or the inner wall of the hole. It is easy to be elastically deformed and the variation of the size of the body pressure dispersibility can be increased, so that the effect of suppressing forward slippage can be further improved when the body pressure at the anchor point is low, and the cushion The range of needs for body pressure dispersion performance for the material can be expanded.

  In addition, as shown in FIG. 11 (G), the cut pattern has eight linear through-cut grooves 393b formed by the through slits intersecting and converging at the intersections, and a center of the intersection of the linear through-cut grooves 393b. Two cut patterns 393a having a plurality of concentric polygonal shapes (concentric octagons in this embodiment) non-penetrating cut grooves 393f that do not penetrate through the second resin layer to be formed may be line-symmetrical to each other. . Further, as shown in FIG. 11H, eight linear through-cutting grooves 403b formed by the through slits widen and intersect at the intersection, and penetrate through the intersection in the thickness direction of the second resin layer. A plurality of concentric polygonal (in the present embodiment, concentric octagonal) non-through cutout grooves 403f which are provided with holes and do not penetrate the second resin layer around the intersection of the linear through cutout grooves 403b. Alternatively, two cut patterns 403a having line-symmetric shapes may be used. Furthermore, as shown in FIG. 11 (I), eight linear through-cutting grooves 413b formed by the through slits widen and intersect at the intersection, and penetrate the intersection in the thickness direction of the second resin layer. A plurality of concentric non-penetrating cut grooves 413f which are provided with through holes and do not penetrate the second resin layer around the intersections of the linear penetrating cut grooves 413b; One cut pattern 413a may be used. By providing the cut pattern 393a, 403a, or 413a as described above, when a load in the vertical direction is applied to the cut pattern, the valve is easily bent and deformed, and the apparent hardness is reduced. Easily covers at least a portion of the opening edge 12b and / or the inner wall 12c of the hole 12a, and furthermore, the body pressure is low when a load (stress) due to a forward shift acts in the direction of the opening edge 12b and / or the inner wall 12c of the hole 12a. Since it can be supported in a state, the reliability of the effect of suppressing the forward displacement can be improved, and the apparent hardness of the cut pattern can be reduced, so that the body pressure dispersibility at the anchor point can be further improved.

  Further, as shown in FIG. 11 (J), as shown in FIG. 11 (J), two linearly symmetrical cut patterns 423a in which eight linear through cut grooves 423b formed by wide through slits intersect and concentrate at the intersection. And a plurality of straight through cut grooves formed parallel to a straight line connecting the intersections of these two cut patterns 423a and separated from the intersections by a predetermined distance and penetrating the second resin layer. A configuration may be provided that includes a linear non-penetrating cut groove 423g that does not penetrate the second resin layer. By providing such a cut pattern 423a and a straight through cut groove or a straight non-through cut groove 423g, the valve and the valve peripheral portion are easily bent and deformed, and the apparent hardness is also reduced. Easily covers at least a part of the opening edge 12b and / or the inner wall 12c of the hole 12a, and is supported in a state where the body pressure is low even when a load due to the frontward shift acts in the direction of the opening edge 12b and / or the inner wall 12c of the hole 12a. Therefore, the effect of suppressing forward slippage and the dispersibility of body pressure can be further improved at the same time. Furthermore, the position of the intersection of the linear through-cut groove or the linear non-through-cut groove 423b and the position of the sciatic bone of the occupant are more appropriately and precisely opposed to each other in accordance with the data of the sciatic position of the human body. It is possible to create a tailor-made cushioning material that matches the body shape of each individual, and to improve the effect of dispersing the body pressure of the occupant and to suppress the forward displacement of the occupant. Can be further improved. When a plurality of linear through-cut grooves 423g penetrating through the second resin layer are provided, it is desirable to provide a configuration in which some valves of the cut pattern 423a do not fall off. Further, the straight non-penetrating cut grooves 393f, 403f, 413f, and 423g formed in FIGS. 11G to 11J may be formed on the surface side of the second resin layer, or may be formed as holes. It may be formed on the side facing 12a. Instead of these straight non-penetrating cut grooves 393f, 403f, 413f and 423g, curvilinear or arcuate curved non-penetrating cut grooves may be used.

  FIG. 12 shows a modified example of the cut pattern in the cushion material of the present embodiment. Each of the cut patterns shown in the figure is a case where the number of valves is 12.

  As shown in FIG. 12 (A), the cut pattern may be two cut patterns 433a having a line-symmetric shape with each other, in which twelve linear through cut grooves formed by the through slits intersect at the intersection. good. Further, as shown in FIG. 12B, twelve linear through-cut grooves formed by the through slits intersect and concentrate at the intersection, and a through-hole penetrating through the intersection in the thickness direction of the second resin layer. May be provided, and two cut patterns 443a having a line-symmetrical shape may be provided. Further, as shown in FIG. 12 (C), twelve linear through-cut grooves formed by the through slits widen and intersect at the intersection, and penetrate through the intersection in the thickness direction of the second resin layer. Two cut patterns 453a having holes and having a line-symmetrical shape may be provided. Further, as shown in FIG. 12 (D), twelve linear through-cut grooves formed by the through slits widen and intersect at the intersections, and penetrate through the intersections in the thickness direction of the second resin layer. Two cut patterns 463a having holes and provided in a non-symmetrical shape with each other may be used. That is, by forming one of the two cut patterns in a shape rotated with respect to the center thereof, the cut pattern may be configured to be non-linearly symmetric with respect to a center line (not shown). Further, as shown in FIG. 12 (E), there are two notch patterns 473a which are line-symmetrical to each other, wherein twelve linear through-cut grooves formed by wide through slits are concentrated and intersect at the intersection. Is also good. Further, as shown in FIG. 12 (F), twelve linear through-cut grooves formed by the through slits widen and intersect at the intersection, and penetrate through the intersection in the thickness direction of the second resin layer. A hole is provided, and a through hole penetrating in the thickness direction of the second resin layer or a side facing the first resin layer is opened in a region between the adjacent linear through cut grooves, and a non-penetrating hole that does not penetrate the second resin layer. Two cut patterns 483a having a through-hole and having a line-symmetrical shape may be used. By providing such a cut pattern 483a, the valve has a small apparent hardness, and the valve is formed in the hole so as to cover at least a part of the opening edge of the hole of the first resin layer and / or the inner wall of the hole. It is easy to be elastically deformed and the variation of the size of the body pressure dispersibility can be increased, so that the effect of suppressing forward slippage can be further improved when the body pressure at the anchor point is low, and the cushion The range of needs for body pressure dispersion performance for the material can be expanded.

  In addition, as shown in FIG. 12 (G), the cut pattern has twelve linear through cut grooves 493b formed by the through slits intersecting and converging at the intersections, and the intersection of the linear through cut grooves 493b is centered. The two cut patterns 493a having a plurality of concentric non-penetrating cut grooves 493f that do not penetrate the second resin layer may be line-symmetrical to each other. Further, as shown in FIG. 12 (H), twelve linear through-cut grooves 503b formed by the through-slits widen and intersect at the intersection, and penetrate the intersection in the thickness direction of the second resin layer. A plurality of concentric non-penetrating cut grooves 503f which are provided with through holes and do not penetrate the second resin layer around the intersections of the linear penetrating cut grooves 503b; One cut pattern 503a may be used. Further, as shown in FIG. 12 (I), twelve linear through-cut grooves 513b formed by the through slits widen and intersect at the intersections, and penetrate the intersections in the thickness direction of the second resin layer. And a plurality of concentric non-penetrating cut grooves 513f that do not penetrate the second resin layer around the intersection of the linear penetrating cut grooves 513b. Two cut patterns 513a may be used. By providing the cut pattern 493a, 503a, or 513a as described above, when a load in the vertical direction is applied to the cut pattern, the valve is easily bent and deformed, and the apparent hardness is also reduced. Easily covers at least a part of the opening edge 12b and / or the inner wall 12c of the hole 12a, and furthermore, a state in which the body pressure is low when a load (stress) due to a forward shift acts on the opening edge 12b and / or the inner wall 12c of the hole 12a. , It is possible to improve the reliability of the effect of suppressing forward displacement, and it is possible to reduce the apparent hardness of the cut pattern, so that the body pressure dispersibility at the anchor point can be further improved.

  Further, as shown in FIG. 12 (J), as shown in FIG. 12 (J), two linearly symmetrical notch patterns in which twelve linear through-cut grooves 523b formed by wide through-slits intersect at the intersection portion. 523a and a plurality of linear through-cut grooves formed parallel to a straight line connecting the intersections of these two cutting patterns 523a and at a predetermined distance from the intersections and penetrating the second resin layer. Alternatively, a mode in which a straight non-penetrating cut groove 523g that does not penetrate the second resin layer may be provided. By providing such a cut pattern 523a and a straight through cut groove or a straight non-through cut groove 523g, the valve and the valve peripheral portion are easily bent and deformed, and the apparent hardness is lowered, so that the hole 12a is formed. Since it is easy to cover at least a part of the opening edge 12b and / or the inner wall 12c of the hole 12a and the body pressure is low even when a load acts on the opening edge 12b and / or the inner wall 12c of the hole 12a, The effect of suppressing forward slippage and the dispersibility of body pressure can be further improved at the same time. Further, the position of the intersection of the linear through-cut groove or the linear non-through-cut groove 523b and the position of the sciatic bone of the occupant are more appropriately and precisely opposed to each other in accordance with the data of the sciatic position of the human body. It is possible to create a tailor-made cushioning material that matches the body shape of each individual, and to improve the effect of dispersing the body pressure of the occupant and to suppress the forward displacement of the occupant. Can be further improved. In the case where a plurality of linear through-cut grooves 523g penetrating the second resin layer are provided, it is desirable to provide a configuration in which some valves of the cut pattern 523a do not fall off. Further, the straight non-through cut grooves 493f, 503f, 513f and 523g formed in FIGS. 12 (G) to 12 (J) may be formed on the surface side of the second resin layer, It may be formed on the side facing 12a. Instead of these straight non-penetrating cut grooves 493f, 503f, 513f and 523g, curvilinear or arcuate curved non-penetrating cut grooves may be used.

  FIG. 13 shows a modified example of the holes provided in the first resin layer in the cushion material of the present embodiment. In the figure, the front of the cushioning material is shown to be on the upper side in the figure.

  As shown in FIG. 13 (A), the hole has an oval planar shape in which a position 25 corresponding to a sit bone of a seated person and a position 26 corresponding to a coccyx are included in the hole. Alternatively, it may be a single hole 22a having no bottom (through). An opening edge portion and / or at least a part of the inner wall in front of the hole portion 22a constitute an anchor point 22d. Further, as shown in FIG. 13 (B), a position 35 corresponding to the sit bone of the seated person is included in the hole, and a position 36 corresponding to the coccyx is outside the hole. It may be one hole 32a having a shape with a bottom (non-penetrating) or no bottom (penetrating). At least a part of the opening edge and / or the inner wall in front of the hole 32a constitutes an anchor point 32d. Further, as shown in FIG. 13 (C), a position 45 corresponding to the sit bone of the seated person is included in each of the two holes, and a position 46 corresponding to the coccyx is outside the hole. Two holes 42a having a bottom (non-penetrating) or a non-bottom (penetrating) may be provided. An opening edge portion and / or at least a part of the inner wall in front of the hole portion 42a constitute an anchor point 42d. Furthermore, as shown in FIG. 13 (D), a position 55 corresponding to the sit bone of the seated person is included in the hole, and a position 56 corresponding to the coccyx has a rectangular planar shape in which the position 56 is outside the hole. One (non-penetrating) or bottomless (penetrating) hole 52a may be used. An opening edge portion and / or at least a part of the inner wall in front of the hole 52a constitute an anchor point 52d. Further, as shown in FIG. 13 (E), a position 65 corresponding to the sit bone of the occupant and a position 66 corresponding to the coccyx have a semicircular planar shape included in the hole and have a bottom (non-penetrating) or no bottom. One hole 62a at the bottom (through) may be used. At least a part of the opening edge and / or the inner wall in front of the hole 62a constitutes an anchor point 62d. Further, as shown in FIG. 13 (F), a position 75 corresponding to the ischium of the seated person is included in each of the two holes, and a position 76 corresponding to the coccyx is included in the remaining holes. It may be three bottomed (non-penetrating) or non-bottomed (penetrating) holes 72a having a planar shape. An opening edge in front of the two holes 72a and / or at least a part of the inner wall constitutes an anchor point 72d. Design values, such as the distance between the ischial bones, can be more appropriately and precisely opposed to each individual's human ischium position data according to the human body's ischium position data. Therefore, the effect of improving the performance of dispersing the body pressure of the occupant and suppressing the forward displacement of the occupant can be further improved in accordance with the body shape of each individual. Further, the inner wall shape of each hole in FIGS. 13A to 13F may be formed such that the hole shape in plan view of the first resin layer 12 is constant in the thickness direction. Alternatively, the hole shape may be formed such that the hole shape changes to a similar or non-similar shape in the thickness direction. In the case where a plurality of holes are formed as shown in FIGS. 13C and 13F, the shape of the inner wall may be different for each hole.

  FIG. 14 and FIG. 15 are diagrams for explaining the operation and effect of the cushion material of the present embodiment. Note that FIGS. 15B to 15E show cross sections taken along line BB of FIG. 15A. This cushioning material has a case in which the linear through-cut groove 13b of the cut pattern 13a of the second resin layer 13 extends radially from the intersection as a starting point, and the terminal end is in a region within the hole 12a of the first resin layer. It is.

  As shown in FIG. 14, when the occupant 17 sits in the hole 12 a of the cushion material 10 of the present embodiment, the valve 13 c and the valve peripheral portion in the cut pattern 13 a of the second resin layer 13 due to the vertical load. 13d elastically deforms toward the hole 12a so as to cover at least a part of the opening edge of the hole 12a of the first resin layer 12 and / or the inner wall of the hole. FIGS. 15 (B) to 15 (E) show the stepwise elastic deformation of the valve 13c and the valve peripheral portion 13d due to a vertical load and a subsequent horizontal load. As described above, since the valve 13c and the valve peripheral portion 13d curve downward and cover the opening edge portion 12b of the hole portion 12a, the body pressure of the occupant is satisfactorily dispersed at that portion, and the valve 13c is bent and deformed. As a result, the adjacent valve 13c (width of the cut portion) expands and the ratio of the gap between the valves 13c increases (not shown), so that the peripheral portion 17a of the ischium stabilizes while further improving the body pressure dispersion performance. Supported, seating stability is improved. In addition, the curved valve 13c and the valve peripheral portion 13d that cover the anchor point 12d constituted by at least a part of the front opening edge and / or the inner wall flexibly contact and support the front edge of the seat bone of the seated person. The forward displacement of the ischium is moderately suppressed, and the inconvenience that the contact pressure with the anchor point 12d rises sharply and the blood flow is locally blocked does not occur. You. Further, as shown in FIG. 15D, the valve 13c and the valve peripheral portion 13d are formed in the hole 12a in accordance with the combination condition and load condition of the shape and size of the hole portion 12a, the valve 13c, and the valve peripheral portion 13d. There are cases such as a case in which it comes into contact with the opening edge 12b but does not come into contact with the inner wall 12c, and a case in which it comes into contact with the opening edge 12b and partially or entirely with the inner wall 12c as shown in FIG. . When the valve 13c and the valve peripheral portion 13d do not contact the entire surface of the inner wall 12c, a gap is formed between the inner wall 12c and the valve 13c and the valve peripheral portion 13d as shown in FIGS. The voids are formed and function to improve the body pressure dispersion performance. As described above, according to the cushioning material 10 of the present embodiment, it is possible to maintain the predetermined body pressure dispersion performance, and to improve both the sitting position stability and the effect of suppressing forward slippage. When the hardness of the valve peripheral portion 13d is high, as shown in FIG. 15D, the upper end of the curved valve peripheral portion 13d also functions as the anchor point 12e.

  FIG. 16 is a diagram for explaining the operation and effect of the modification of the present embodiment. Note that FIGS. 16B to 16E show cross sections taken along line CC of FIG. 16A.

  In this modified embodiment, the length of the linear through-cut groove 13b 'in the cut pattern 13a' of the second resin layer is long, and a part thereof protrudes to a region outside the hole portion 12a of the first resin layer. Is the case. That is, this is a case where the linear through-cut groove 13b 'of the cut pattern 13a' radially extends from the intersection as a starting point, and the terminal end is located in a region outside the hole 12a of the first resin layer. As can be seen from FIGS. 16 (B) to 16 (E) showing the stepwise elastic deformation of the valve 13c 'of the cut pattern 13a' due to the vertical load and the subsequent horizontal load, this modified embodiment is also applicable. Since the valve 13c 'curves downward and covers the opening edge of the hole 12a, the occupant's body pressure is satisfactorily dispersed at that portion, and the adjacent valve 13c' accompanies the curved deformation of the valve 13c '. Since the gap (width of the cut portion) is increased and the ratio of the gap between the valves 13c 'is increased (not shown), the peripheral portion of the ischium is stably supported while the body pressure dispersing performance is further improved, and the sitting position is stabilized. The performance is improved. In addition, the curved valve 13c 'covering the anchor point 12d, which is constituted by at least a part of the front opening edge and / or the inner wall, flexibly abuts and supports the front edge of the sciatic of the seated person. The forward movement is gently suppressed, and the forward displacement is effectively suppressed without the disadvantage that the contact pressure with the anchor point 12d rises sharply and the blood flow is locally blocked. Also, as shown in FIG. 16D, the valve 13c 'abuts on the opening edge 12b of the hole 12a according to the combination condition and the load condition of the shape and size of the hole 12a and the valve 13c'. There are cases such as a case that does not abut against the inner wall 12c and a case that abuts the opening edge 12b and partially or entirely the inner wall 12c as shown in FIG. When the valve 13c 'does not contact the entire surface of the inner wall 12c, a gap is formed between the inner wall 12c and the valve 13c' as shown in FIGS. 16 (D) and 16 (E). Functions to improve dispersion performance. As described above, even with the cushion material according to this modified embodiment, the predetermined body pressure dispersing performance can be maintained, and the sitting position stability and the effect of suppressing forward displacement can both be improved. When the hardness of the valve 13c 'is high, the upper end of the curved valve 13c' becomes the anchor point 12e ', as shown in FIG.

  FIG. 17 shows the structure of the cushioning material of the present embodiment and the modified form of the cushioning material in comparison, and FIG. FIG. 4B shows a cross section taken along line DD, and FIG. 4B shows a plane of the first resin layer 12 ″ and the second resin layer 13 ″ and a cross section taken along line EE of the modified embodiment.

  In the cushioning material of the present embodiment, as shown in FIG. 17A, the second resin layer 13 has a cut pattern 13a in a region facing the hole 12a of the first resin layer 12, The cut pattern 13a is constituted by a plurality of linear through cut grooves 13b which are through slits. With such a configuration, the valve 13c and the valve peripheral portion 13d, which are the regions between the adjacent linear through-cut grooves 13b of the cut pattern 13a, have the opening edge 12b of the hole 12a of the first resin layer 12 and / or Alternatively, it curves toward the hole 12a and elastically deforms so as to cover at least a part of the inner wall 12c of the hole 12a, and covers the opening edge of the hole 12a and the periphery of the opening edge. It is supported by the valve 13c and the valve peripheral portion 13d that are curved downward. Further, the curvature of the valve 13c causes the space between the adjacent valves 13c (the width of the cut portion) to expand, thereby increasing the ratio of the gap between the valves 13c. The body pressure of the seated person is satisfactorily dispersed, the periphery of the ischium is stably supported, and the sitting position stability is improved. Further, when a load (stress) due to a forward shift acts in the direction of the opening edge 12b and / or the inner wall 12c of the hole 12a, a curved valve that covers at least a part (anchor point) of the front opening edge and / or the inner wall. 13c and the valve peripheral portion 13d flexibly contact and support the front edge of the sciatic bone of the seated person, so that the forward movement of the sciatic bone is moderately suppressed, and the contact pressure with the anchor point sharply increases, and blood flow is reduced. The forward slip is effectively suppressed without causing any inconvenience such as being locally blocked.

  On the other hand, in the cushioning material according to the modified embodiment, as shown in FIG. 17B, the second resin layer 13 ″ is formed in a region facing the hole 12a ″ of the first resin layer 12 ″. The non-penetrating cut pattern 13a "is provided with a plurality of linear non-penetrating cut grooves 13b" which are non-penetrating slits opened on the side of the hole 12a ". By doing so, the inter-groove region 13c "of the non-penetrating cut pattern 13a" and the inter-groove region peripheral portion 13d "continuous with the inter-groove region 13c" become the opening edge of the hole 12a "of the first resin layer 12". 12b "and / or bend toward the hole 12a" and elastically deform so as to cover at least a part of the inner wall 12c "of the hole a", and at least the opening edge and / or the inner wall of the hole 12a ". Partly overturn Therefore, the periphery of the ischial bone is supported by the downwardly curved inter-groove region and the peripheral portion of the inter-groove region, and the width of the adjacent inter-groove region increases with the curved deformation of the inter-groove region, thereby increasing the ratio of the void. Thereby, the body pressure of the seated person is satisfactorily dispersed, and the periphery of the ischium is stably supported, so that the sitting position stability is improved. Further, when a load (stress) due to a forward shift acts in the direction of the opening edge 12b "and / or the inner wall 12c" of the hole 12a ", at least a part (anchor point) of the front opening edge and / or the inner wall is covered. Since the curved inter-groove region 13c "and the inter-groove region peripheral portion 13d" flexibly contact and support the front edge of the sciatic bone of the occupant, the forward movement of the sciatic bone is gently suppressed, and the position of the anchor point is reduced. All of the above-mentioned modifications and aspects of the cushioning material of the present invention are effectively suppressed without the disadvantage that the contact pressure rises sharply and the blood flow is locally blocked. Can be constituted by a non-penetrating cut pattern having a linear non-penetrating cut groove by such a non-penetrating slit. The linear non-penetrating cut groove 13b ″ In this embodiment, the grooves are linear, but any shape may be used as long as the inter-groove region 13c ″ is formed by linear non-penetrating cut grooves adjacent to each other, such as a straight line, a wavy shape, a circular arc shape, or the like. , The line width can be constant or changed in the length direction.

  FIG. 18 shows an example in which the cushion material of the present embodiment is applied to a seat surface of a wheelchair.

  As shown in the figure, a first resin layer (sciatic storage layer) 12 having a hole 12a and a second resin layer (sciatic support layer) 13 having a cut pattern 13a are provided on a seating surface 18a of a wheelchair 18. By mounting the cushioning material of the basic configuration having the above, the cushioning material of the present embodiment is applied to a wheelchair, while maintaining a predetermined body pressure dispersing performance, the seating stability and the effect of suppressing forward slippage. Can be improved. Further, the cushion material of the present embodiment can be applied to a cushion material of a mattress or a cushion material of a seat surface of a vehicle seat. If this cushion material is applied to the mattress, the predetermined body pressure dispersibility is maintained when lying down or sitting on the mattress, thereby improving the sitting position stability and the prevention of forward slippage, and when lying down on the mattress or sitting down. In this case, it is possible to suppress the collapse of a predetermined recumbent posture or a sitting posture, and particularly to prevent a mattress having a backrest function from moving forward when the backrest is raised. Also when applied to the cushioning material of the seat surface of the vehicle seat, it is possible to maintain the predetermined body pressure dispersing performance and to improve the sitting position stability and the effect of suppressing forward slippage.

  FIG. 19 schematically shows a configuration of a cushion material according to another embodiment of the present invention.

  As shown in the figure, the cushioning material according to the present embodiment includes a first resin layer (sciatic bone) via an adhesive layer on a base layer 21 made of a resin foam such as a polyurethane resin, if necessary. A second resin layer (sciatic support layer) 13 is always laminated on the first resin layer 12 via an adhesive layer. Accordingly, a third resin layer (body pressure dispersion imparting layer) 14 is laminated via an adhesive layer.

  The base layer 21 is formed, for example, by molding a resin foam such as a polyurethane resin into a flat plate shape, and is provided to increase the mechanical strength of the cushion material and prevent the seated person from bottoming. Hard portions 21a made of a synthetic resin foam harder than the synthetic resin foam constituting the layer are provided on both side ends in the front-rear direction of the base layer 21. Thereby, the mechanical strength of the both ends of the cushion material is further increased, and the stability in the left-right direction in the sitting posture of the user is improved, so that a stable sitting posture can be maintained even in applications other than a wheelchair. In a modification of the present embodiment, the first resin layer 12 and / or the second resin layer 13 may be provided with a hard portion similar to the base layer 21.

  The other configurations, functions, effects, and modifications of the first resin layer 12, the second resin layer 13, and the third resin layer 14 in the present embodiment are the same as those in the above-described embodiment. Description is omitted.

  Hereinafter, a comparative test of Example 1, Comparative Example 1, and Comparative Example 2 of the cushioning material of the present invention will be described.

(Example 1)
A laminate (cushion material) having a basic configuration in which the first resin layer (sciatic storage layer) 12 and the second resin layer (sciatic support layer) 13 shown in FIGS. 2 to 5 are laminated via an adhesive layer. ), A base layer 11 is laminated below the first resin layer (sciatic storage layer) 12 of the laminate via an adhesive, and a third resin layer is formed on the second resin layer 13. 14 (body pressure dispersing layer) was laminated without bonding to produce a cushion material having the structure shown in FIG. As a constituent material, a polyurethane resin foam (Model Rubber-Like 33H manufactured by Toyo Quality One Co., Ltd., hardness 190 N according to JIS K6400-2A method) was used. As the base layer 11, a rectangular layer having a size of 400 mm × 400 mm × 20 mm was used. As the first resin layer 12, the one having the shape and dimensions shown in FIG. 20 was used. As the second resin layer 13, one having the shape and dimensions shown in FIG. 21 was used. As the third resin layer 14, one having the shape and dimensions shown in FIG. 22 was used. The total thickness was 75 mm. The unit of the dimensions in FIGS. 20 to 22 is mm.

(Comparative Example 1)
Alpha cushion (model number KC-WP4040), which is a conventional cushion material of the present applicant, was used. This cushioning material is a cushioning material described in Patent Document 2 and has a body pressure dispersion imparting layer (shown in FIG. 1) made of a polyurethane resin foam having on its upper surface a number of block elements partitioned by a number of non-through grooves. This is a cushioning material formed by laminating a low resilience polyurethane layer on the third resin layer 14). The total thickness was 60 mm.

(Comparative Example 2)
The configuration of the cushioning material of the first embodiment is the same as that of the cushioning material of the first embodiment except that the second resin layer in the cushioning material of the first embodiment does not have a cut pattern and has a flat surface without any irregularities or holes. A cushion material was created. As a constituent material, a polyurethane resin foam (Model Rubber-Like 33H manufactured by Toyo Quality One Co., Ltd., hardness 190 N according to JIS K6400-2A method) was used. The total thickness was 75 mm.

(First comparative test)
In order to verify the effect of suppressing the front displacement of the cushion material, the tensile force of the example, comparative example 1 and comparative example 2 was measured using a measuring device for comparative test shown in FIG. As shown in the figure, a cushion material C (10) to be verified is placed on a trolley T which is freely movable in a horizontal direction, and the back of the thigh is imitated from the buttocks in a sitting posture on the upper surface of the cushion material C (10). A seating plate P is set, and various weights (10, 15, 20, 25, 30 kg) are set on the seating plate P via a shaft S supported movably in a vertical direction by a support base F. )), A vertical load is applied, and the bogie T is pulled horizontally at a constant speed (50 mm / sec) through the digital force gauge G, so that the peak value of the tensile force indicated by the digital force gauge G is reduced. This was done by measuring. It was determined that the greater the peak value of the pulling force, the higher the ability to receive the load at the anchor point and the more excellent the effect of suppressing forward slippage. The peak value was measured five times for each weight, and the average value was calculated. The measurement results are shown in Table 1. The unit of the peak value of the tensile force is kgf. The seating plate P used was a plate having a shape defined by JIS S1203 reduced to a size of 70%. This is to fit the average Japanese size.

  FIG. 24 shows the relationship between the weight (kg) of the weight and the average value (kgf) of the measured tensile force in the measurement results of the first comparative test shown in Table 1. As can be seen from the figure, in the first embodiment including the laminated body of the first resin layer (sciatic storage layer) and the second resin layer (sciatic support layer), the first resin layer (sciatic storage layer) Compared to Comparative Example 1 having no laminated body of the second resin layer (sciatic support layer) and Comparative Example 2 having no cut pattern in the second resin layer of the laminated body, It can be seen that the tensile force is large under the vertical load, and the effect of suppressing forward displacement is excellent.

(Second comparative test)
In order to verify the body pressure dispersibility in the normal sitting position, the body pressure dispersion performance of Example 1, Comparative Example 1 and Comparative Example 2 was measured. For this measurement, a surface pressure sensor XSENSOR PX100.36.36.02 manufactured by XSENSOR Technology Corporation was mounted on the seating surface of a wheelchair (wheelchair mufor MYU4-22 manufactured by Miki Co., Ltd.), and a height of 170 cm and a body weight of 65 kg were placed thereon. , BMI (body mass index) of 22.5, and measuring the surface pressure distribution 5 minutes after sitting. FIG. 25 shows the measurement results of the surface pressure (body pressure) distribution. FIG. 7A shows the measurement result of the cushion material of Example 1, FIG. 7B shows the measurement result of the cushion material of Comparative Example 1, and FIG.

  As shown in FIG. 25, in Example 1 including the laminated body of the first resin layer (sciatic storage layer) and the second resin layer (sciatic support layer), the first resin layer (sciatic storage layer) Compared to Comparative Example 1 having no laminated body of the second resin layer (sciatic support layer) and Comparative Example 2 having no cut pattern in the second resin layer of the laminated body, It can be seen that the body pressure is low and the change is small throughout, and the body pressure dispersibility is remarkably excellent.

(Third comparative test)
In order to verify the body pressure dispersibility (body pressure rise suppression effect) at an anchor point (area) in a sitting posture in which the ischium is shifted forward (a sitting posture in a forwardly displaced state), the cushion materials of Example 1 and Comparative Example 2 were used. With respect to the body pressure, the body pressure dispersion performance in a sitting posture in a forwardly displaced state was measured. For this measurement, a surface pressure sensor XSENSOR PX100.36.36.02 manufactured by XSENSOR Technology Corporation was mounted on the seating surface of a wheelchair (wheelchair mufor MYU4-22 manufactured by Miki Co., Ltd.), and a height of 170 cm and a body weight of 65 kg were placed thereon. , BMI (body mass index) of 22.5, and measuring the surface pressure distribution 5 minutes after sitting. FIG. 26 shows the measurement results of the surface pressure (body pressure) distribution. FIG. 7A shows the measurement result of the cushion material of Example 1, and FIG. 7B shows the measurement result of the cushion material of Comparative Example 2.

  According to FIG. 26, in Example 1 including the laminated body of the first resin layer (sciatic storage layer) and the second resin layer (sciatic support layer), the first resin layer (sciatic storage layer) Although the maximum pressure in the anchor region is equal to that in Comparative Example 2 in which the second resin layer in the laminate of the second resin layer (sciatic support layer) has no cut pattern, the maximum pressure The range is narrow, and it can be seen that the effect of suppressing the increase in body pressure at the anchor point is very excellent.

  From the first to third comparative tests described above, according to the cushioning material of Example 1, the effect of suppressing the forward displacement and the performance of dispersing the body pressure at the time of sitting are lower than those of the cushioning materials of Comparative Example 1 and Comparative Example 2. It can be seen that both are excellent, and the effect of suppressing the increase in body pressure in the anchor point region at the time of suppressing the sitting stability and the forward displacement is excellent.

  The embodiments described above are all illustrative of the present invention and are not intended to limit the present invention, and the present invention can be embodied in other various modifications and alterations. Therefore, the scope of the present invention is defined only by the appended claims and their equivalents.

10, C cushion material 11, 21 Base layer 1
12, 12 "first resin layer 12a, 12a", 22a, 32a, 42a, 52a, 62a, 72a hole 12b, 12b "opening edge 12c, 12c" inner wall 12d, 12e, 12e ', 22d, 32d, 42d, 52d, 62d, 72d Anchor point 13, 13 ″ Second resin layer 13a, 13a ′, 23a, 33a, 43a, 53a, 63a, 93a, 103a, 113a, 123a, 133a, 143a, 153a, 163a, 173a , 173a, 193a, 203a, 213a, 223a, 233a, 243a, 253a, 263a, 273a, 283a, 293a, 303a, 313a, 323a, 333a, 343a, 353a, 363a, 373a, 383a, 393a, 403a, 413a, 423a , 433a, 44 a, 453a, 463a, 473a, 483a, 493a, 503a, 513a, 523a Cutting pattern 13a ″ Non-penetrating cutting pattern 13b, 13b ′, 73b, 83b, 153b, 163b, 173b, 183b, 213b, 223b, 293b, 303b, 313b, 323b, 393b, 403b, 413b, 423b, 493b, 503b, 513b, 523b Linear through-cut groove 13b ″ Linear non-through-cut groove 13c, 13c ′ Projection piece (valve)
13c ″ Inter-groove area 13d Peripheral area of protruding piece area (valve peripheral area)
13d ″ Peripheral portion of the inter-groove region 14 Third resin layer 14a Non-through groove 14b Block element 17 Seated person 17a Peripheral portion of ischium 18 Wheelchair 18a Seating surface 21a Hard portion 25, 35, 45, 55, 65, 75 Corresponds to ischbone Position 26, 36, 46, 56, 66, 76 Position corresponding to the coccyx 73e, 83e Intersection 153f, 163f, 173f, 293f, 303f, 313f, 393f, 403f, 413f, 493f, 503f, 513f Non-penetrating cut groove 183g, 213g, 223g, 323g, 423g, 523g Straight non-penetrating cut groove F Supporting stand G Digital force gauge P Seat backing plate S Shaft T Bogie W Weight

Claims (21)

A cushioning material having a structure in which a second resin layer is laminated on a first resin layer,
The first resin layer includes at least one hole with or without a bottom,
The second resin layer is formed of at least three linear through-cut grooves that penetrate at least in a region facing the hole and extend in the thickness direction of the second resin layer and intersect with each other at a predetermined intersection. Comprising at least one notch pattern,
A cantilever-shaped projecting piece consisting of an area between the adjacent linear through-cutting grooves of the cutting pattern and a projecting piece area peripheral portion continuous with the base of the projecting piece are configured to be elastically deformable,
The protruding piece and / or the protruding piece area peripheral portion may cover at least a part of the opening edge of the hole and / or the inner wall of the hole when a vertical load is applied to the cut pattern. A cushion material configured to elastically deform toward the hole.   The cushion material according to claim 1, wherein the linear through-cut groove is constituted by a through slit.   The cushion material according to claim 1, wherein the two cut patterns are arranged at different positions in a region facing the hole.   The cushion material according to claim 3, wherein a distance between the intersections of the linear through-cut grooves in the two cut patterns is 110 to 140 mm.   The second resin layer is formed at a position parallel to a straight line connecting the intersections of the linear through-cut grooves in the two cut patterns and at a predetermined distance from the intersection, and the second resin layer is formed on the second resin layer. The cushion material according to claim 3, further comprising a plurality of straight through cut grooves penetrating the resin layer or straight non-through cut grooves not penetrating the second resin layer.   The cushion material according to claim 1, wherein the three cut patterns are arranged at different positions in a region facing the hole. The cut pattern is
In the case where the number of the holes is one, one notch pattern provided at a position facing the center of the hole, and a position facing the seat bone of a seated person in each of two regions obtained by dividing the hole into two. Two cut patterns provided, or three cut patterns provided at positions facing three regions obtained by dividing the hole into three, and two cut patterns are provided at positions facing the seat bone of the seated person. Has been
In the case where the number of the holes is two, two cut patterns provided at positions facing the ischium of the occupant of each of the two holes,
When there are three holes, there are three notch patterns provided at positions facing each of the three holes, and two notch patterns are provided at positions facing the sit bones of the seated person. The cushioning material according to any one of claims 1 to 6, wherein:   The cushion material according to any one of claims 1 to 7, wherein the length of the linear through-cut groove is 20 mm or more.   9. The non-penetrating cut groove having a plurality of concentric circles which do not penetrate the second resin layer around the intersection of the linear penetrating cut groove. The cushioning material according to any one of the preceding claims.   The cut pattern includes a plurality of concentric polygonal non-penetrating cut grooves that do not penetrate the second resin layer around the intersection of the linear through cut grooves. The cushioning material according to any one of the above.   A through hole penetrating in the thickness direction of the second resin layer or a side facing the first resin layer in a region between the linear penetrating cut grooves adjacent to the cut pattern, and the second resin The cushion material according to any one of claims 1 to 10, further comprising a non-through hole that does not penetrate the layer. A cushioning material having a structure in which a second resin layer is laminated on a first resin layer,
The first resin layer includes at least one hole with or without a bottom,
The second resin layer is open at least in a region opposed to the hole portion on a side opposed to the first resin layer, and at least three portions which do not penetrate the second resin layer and intersect with each other at a predetermined intersection. Comprising at least one non-penetrating cut pattern each composed of a linear non-penetrating cut groove,
The inter-groove region between the linear non-penetrating cut grooves adjacent to the non-penetrating cut pattern and the inter-groove region peripheral portion continuous with the inter-groove region are configured to be elastically deformable,
The inter-groove region and / or a peripheral portion of the inter-groove region covers at least a part of an opening edge of the hole and / or an inner wall of the hole when a vertical load is applied to the non-penetrating cut pattern. Characterized in that the cushion material is elastically deformed toward the hole.   The cushion material according to any one of claims 1 to 12, wherein the hole of the first resin layer is formed as a bottomless hole penetrating the first resin layer. A third resin layer laminated on a surface of the second resin layer opposite to the first resin layer;
The third resin layer has a number of block elements divided by a non-through groove having an opening on a surface opposite to a surface facing the second resin layer, and the non-through groove is The cushion material according to any one of claims 1 to 13, wherein a portion where a vertical load acting on the resin layer (3) is larger is formed deeper.   The device according to any one of claims 1 to 14, further comprising a base layer made of resin laminated on a surface of the first resin layer opposite to the second resin layer. Cushioning material.   At least one of the first resin layer, the second resin layer, and the base layer is formed of a resin foam that is harder than the resin forming each layer at both end portions in the front-rear direction of the cushion material. The cushion material according to claim 15, further comprising a hard portion.   The cushion material according to any one of claims 1 to 16, wherein an adhesive layer is interposed at least between the first resin layer and the second resin layer.   17. The cushion material according to claim 15, wherein at least one of the first resin layer, the second resin layer, and the base layer is formed of a resin foam or a three-dimensional network structure. .   The cushion material according to any one of claims 1 to 18, wherein the cushion material is a cushion material for a wheelchair seat.   The cushion material according to any one of claims 1 to 18, wherein the cushion material is a mattress cushion material.   The cushioning material according to any one of claims 1 to 18, wherein the cushioning material is a cushioning material for a seat surface of a vehicle seat.

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