CN110870641A - Cushion material - Google Patents

Cushion material Download PDF

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Publication number
CN110870641A
CN110870641A CN201910797043.XA CN201910797043A CN110870641A CN 110870641 A CN110870641 A CN 110870641A CN 201910797043 A CN201910797043 A CN 201910797043A CN 110870641 A CN110870641 A CN 110870641A
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CN
China
Prior art keywords
resin layer
cushion material
cut
linear
hole
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Granted
Application number
CN201910797043.XA
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Chinese (zh)
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CN110870641B (en
Inventor
望月重利
笹泽宣弘
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Taica Corp
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Taica Corp
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
    • A47C27/14—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays
    • A47C27/142—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays with projections, depressions or cavities
    • A47C27/146—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays with projections, depressions or cavities on the outside surface of the mattress or cushion
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
    • A47C27/14—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays
    • A47C27/15—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas with foamed material inlays consisting of two or more layers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/1043—Cushions specially adapted for wheelchairs
    • A61G5/1045—Cushions specially adapted for wheelchairs for the seat portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/62—Thigh-rests

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)

Abstract

Provided is a cushion material having a structure in which a second resin layer is laminated on a first resin layer, wherein the seat stability and the front offset suppression effect can be improved at the same time while maintaining a predetermined body pressure distribution performance. The first resin layer has at least one hole having a bottom or no bottom, and the second resin layer has at least one cut pattern formed by at least three linear through-cut grooves that penetrate in the thickness direction of the second resin layer and intersect each other at predetermined intersection portions, in at least a region facing the hole. Cantilever-like projecting pieces formed by the regions between adjacent linear through-cut grooves of the cut pattern and the peripheral edge of the projecting piece region continuous with the root of the projecting piece are configured to be elastically deformable. The protruding piece and/or the protruding piece area peripheral portion are configured to be elastically deformed toward the hole portion so as to cover at least a part of the opening edge portion of the hole portion of the first resin layer and/or the inner wall of the hole portion when a load in the vertical direction acts on the cut pattern.

Description

Cushion material
Technical Field
The present invention relates to a cushion material having a body pressure distribution effect, which is suitable for use in a seat, a car seat, a vehicle seat, a mattress, and the like.
Background
A cushion material in which relatively low-resilience polyurethane foam is laminated on a surface of polyurethane foam having a specific surface structure to improve dispersion of body pressure has been widely used.
The present applicant proposed in patent documents 1 and 2a cushion material obtained by: a plurality of block elements partitioned by grooves are formed on the surface of a cushion base material made of a soft synthetic resin foam such as a polyurethane foam, and a seat material such as a low-rebound polyurethane foam is laminated on the upper surface of the cushion base material.
In patent document 1, a groove is formed in a seat cushion base material in the following manner: the depth varies depending on the body contour of the user (seated person), and the deeper the position of the portion where the convex portion protrudes in the contact direction corresponding to the body contact with the cushion material. In patent document 2, an insert made of a soft synthetic resin is inserted into a groove of a seat cushion base material so as to fill the groove, thereby preventing bending of a block element and hardening the hardness of the periphery of the seat cushion base material where body pressure is concentrated. When the insert is inserted, the insert is arranged so as to surround the plurality of block elements at the position where the load is increased in the seat cushion base material.
The cushion materials described in these patent documents 1 and 2 have a feature of remarkably excellent body pressure dispersion performance, and are used in medical institutions, nursing/welfare facilities, and the like as cushion materials for preventing ischemia due to skin stretch and bedsores caused by the ischemia.
On the other hand, when such a cushion material is used for a car seat or a mattress, so-called "forward shift" may occur in which the sitting person gradually shifts the ischial positions forward. When the pre-shift occurs, the following problems easily occur: the sitting person slides down from the cushion material; a contact surface shift occurs in the seated person due to a shearing force acting between the seat and the hip of the seated person due to the front shift due to a relatively long-term use; alternatively, the internal organs and respiratory organs of the seated person are pressed by the pressure applied to the buttocks of the seated person from the seat section, which is a position where the buttocks of the seated person contact the cushion material, and the balance of the physical condition is disturbed.
In order to solve such a problem, for example, patent document 3 proposes the following cushion material: a member provided with a frame-shaped hole is arranged between a sitting portion for receiving body pressure and a seat pressure driven portion for dispersing the body pressure, and the frame-shaped hole is used as a structure of a hip supporting portion for supporting at least two hip muscle portions except for a sacrum, a coccyx and an ischial tuberosity portion in the rear of the hip, thereby improving the supporting performance for body shaking and realizing body pressure dispersion.
For example, patent document 4 proposes a cushion material having a structure in which a bottom cushion material and an upper cushion material are covered with a skin material, and the cushion material receives the buttocks of a sitting person, wherein the bottom cushion material is harder than the upper cushion material, a plurality of elongated slits are formed in parallel to portions of the bottom cushion material located at ischial tuberosity portions and peripheral portions thereof in the buttocks when the bottom cushion material is seated, and an elongated insert cushion material which is the same as the upper cushion material or harder than the upper cushion material and softer than the bottom cushion material is fitted into and fixed to the slits of the bottom cushion material. With this cushion material, when the sitting time becomes long and the seated person feels pain due to pressure on the peripheral edge of the ischial tuberosity portion of the hip, the sitting position is moved forward or backward, and the portion where pain is felt can be moved above the embedded cushion material, whereby pain due to pressure can be reduced.
Further, for example, patent document 5 proposes a cushion material in which: by continuously changing the rebound force of the cushion material in the front-rear direction, the distribution of the body pressure due to the load of the seated person is continuously changed, and the dispersion of the body pressure due to the load of the seated person is improved, as a result of which the sitting comfort of the seated person is improved and the front offset is prevented.
Further, for example, patent document 6 proposes a cushion material in which: the cushion core material is composed of an upper layer part made of a polymer gel-like material, a front intermediate layer part made of a high-hardness low-resilience polyurethane foam disposed at the lower front part of the upper layer part, a rear intermediate layer part made of a low-hardness low-resilience polyurethane foam disposed at the lower rear part of the upper layer part, and a lower intermediate layer part made of a normal polyurethane foam disposed at the lower sides of the front intermediate layer part and the rear intermediate layer part, and thereby, the cushion core material is excellent in body pressure distribution and prevents front displacement of the buttocks.
Documents of the prior art
Patent document
Patent document 1: japanese patent application laid-open No. 4221251
Patent document 2: japanese patent application laid-open No. 4221280
Patent document 3: japanese patent application laid-open No. 4686678
Patent document 4: japanese patent application laid-open No. 5695265
Patent document 5: japanese patent application laid-open No. 5657305
Patent document 6: japanese patent application laid-open No. 4104436
Disclosure of Invention
Problems to be solved by the invention
If the conventional cushion material as described above is used, although the body pressure dispersion of the seated person is improved to some extent, a problem arises when it is intended to prevent the front deviation of the seated person while the body pressure is dispersed. This is because there is a relationship of the two-rhythm backs opposite to each other between the body pressure dispersion performance of the occupant of the cushion material and the front offset suppression effect. That is, if the body pressure distribution performance of the sitting person of the cushion material is improved, the seat stability performance of the cushion material is lowered, and as a result, the effect of suppressing the forward shift of the sitting person is lowered. In particular, when the front deviation is suppressed by a structure (referred to as an anchor point) in which a difference in hardness is provided in a seat surface portion and a dam is provided in a portion having a large hardness as in patent document 3, the front deviation preventing effect is excellent when the hardness of the anchor point is large, but the body pressure dispersing effect at the anchor point is low, and the body pressure dispersing effect is excellent when the hardness of the anchor point is small, but the front deviation preventing effect is low. In addition to such a hardness level difference, the anchor point represents a structure including a front deviation prevention level difference such as a height level difference.
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a cushion material which can improve both seat stability and a front offset suppression effect while maintaining a predetermined physical pressure distribution performance.
Means for solving the problems
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 having a bottom or no bottom, and the second resin layer has, in at least a region facing the hole, at least one cut pattern formed by at least three linear through-cut grooves that penetrate in the thickness direction of the second resin layer and intersect each other at predetermined intersection portions. Cantilever-like projecting pieces formed by the regions between adjacent linear through-cut grooves of the cut pattern and the peripheral edge of the projecting piece region continuous with the root of the projecting piece are configured to be elastically deformable. The protruding piece and/or the protruding piece area peripheral portion are configured to be elastically deformed toward the hole portion so as to cover at least a part of the opening edge portion of the hole portion of the first resin layer and/or the inner wall of the hole portion when a load in the vertical direction acts on the cut pattern.
As described above, in the seat cushion material according to the present invention, the first resin layer includes the hole portion, and the second resin layer laminated on the first resin layer includes the cut pattern formed by each of the at least three cut grooves penetrating in the thickness direction and intersecting with each other. When a vertical load is applied to the cut pattern, the cantilever-like projecting piece, which is a region between adjacent cut grooves of the cut pattern, and the peripheral edge of the projecting piece region continuous with the root of the projecting piece are elastically deformed toward the hole portion so as to cover at least a part of the opening edge of the hole portion and/or the inner wall of the hole portion of the first resin layer. Accordingly, the peripheral portions of the protruding pieces and the protruding piece regions are bent downward to cover the opening edge portions and the peripheral portions of the opening edge portions of the hole portions, so that the peripheral portions of the ischia are supported by the protruding pieces and the peripheral portions of the protruding piece regions bent downward, and further, as the protruding pieces are bent and deformed, the adjacent protruding pieces (the width of the cut portions) are expanded, and the ratio of the gaps between the protruding pieces is increased, so that the body pressure of the seated person is well dispersed, the peripheral portions of the ischia are stably supported, and the seat stability is improved. Further, when a load acts in the horizontal direction of the frontal offset, the protruding piece and the protruding piece region peripheral portion that are bent so as to cover at least a part (anchoring point) of the front opening edge portion and/or the inner wall of the hole portion flexibly contact and support the front edge portion of the ischial bones of the sitting person while maintaining the above-described body pressure dispersibility and seat stability, and therefore, the forward movement of the ischial bones is moderately suppressed, and inconveniences such as a rapid increase in the contact pressure with the anchoring point and local blockage of blood flow do not occur, and the frontal offset is effectively suppressed. As described above, according to the cushion material of the present invention, the seat stability and the effect of suppressing the front offset can be improved together while maintaining the predetermined body pressure distribution performance.
Preferably, the linear through-cut groove is formed by a through-cut. By forming the through-cut, the protruding piece and the protruding piece region peripheral portion are easily bent downward so as to cover at least a part of the opening edge portion of the hole portion and/or the inner wall of the hole portion when a load is applied, and therefore the above-described operational effects can be achieved efficiently.
It is also preferable that the two cutting patterns are arranged at mutually different positions in the region opposed to the hole portion. This improves the conformability to the shape of the buttocks of the user, and therefore can improve the body pressure dispersibility and the seat stability of the cushion material.
In this case, it is more preferable that the distance between the intersections of the linear through-cuts in the two cut patterns is 110mm to 140 mm. This enables the ischial position of the human body to be accurately reflected on the position of the intersection of the predetermined linear through-cut grooves provided in the second resin layer based on a statistical database or the like, and therefore the effect of suppressing the anterior deviation of the seated person can be more reliably improved.
It is also preferable that the second resin layer includes a plurality of linear through-cut grooves that are formed in parallel to a straight line connecting intersection portions of the linear through-cut grooves in the two cut patterns and that penetrate the second resin layer or linear non-through-cut grooves that do not penetrate the second resin layer at positions separated by a predetermined distance from the intersection portions. As a result, the protruding piece and the protruding piece region peripheral portion are easily bent and deformed, and the apparent hardness is also low, so that at least a part of the opening edge portion of the hole portion of the first resin layer and/or the inner wall of the hole portion is easily covered, and even when a load acts on the opening edge portion and/or the inner wall, the support can be performed in a state where the body pressure is low, and therefore, the front displacement suppression effect and the body pressure dispersibility can be further improved in a lump. Further, since the position of the intersecting portion of the linear through-cut groove of the cut pattern formed in the second resin layer and the position of the ischia of the seated person can be made to more appropriately and precisely oppose each other according to the human body ischial position data of each person, a customized cushion material that matches the body shape of each person can be produced, and the body pressure distribution performance of the seated person and the effect of suppressing the forward displacement of the seated person can be further improved according to the body shape of each person. In the case where the second resin layer has a plurality of linear through-cut grooves penetrating through the second resin layer, the cut pattern has some structure in which a part of the cantilever-shaped protruding pieces does not come off.
It is also preferable that the three cutting patterns are arranged at mutually different positions in the region opposed to the hole portion. Thus, the number of cut patterns provided in the second resin layer is increased, so that the positions of the intersections of these cut patterns can be more accurately matched with the positions of the ischia bones of the seated person, and therefore the improvement of the body pressure distribution performance of the seated person and the effect of suppressing the anterior deviation of the seated person can be more precisely improved in accordance with the body shape of each person.
Preferably, in the case where there is one hole portion, the cutting pattern is one cutting pattern provided at a position opposed to a center portion of the hole portion, two cutting patterns provided at positions opposed to ischial bones of the seated person for each of two regions obtained by bisecting the hole portion, or three cutting patterns provided at positions opposed to three regions obtained by trisecting the hole portion, wherein the two cutting patterns are provided at positions opposed to the ischial bones of the seated person. In addition, in the case where there are two hole portions, the cutting pattern is preferably two cutting patterns provided at positions of each of the two hole portions which are opposed to the ischial bones of the seated person. Further, it is also preferable that, in the case where the hole portions are three, the cutting pattern is three cutting patterns provided at positions opposed to each of the three hole portions, two of which are provided at positions opposed to the ischial bones of the seated person. This can increase the variation in the form of the cut pattern, and can more appropriately and precisely match the position of the intersection of the linear through-cut grooves of the cut pattern according to individual differences in the position of the ischia of the seated person, thereby further improving the body pressure distribution performance of the seated person and the effect of suppressing the forward displacement of the seated person.
It is also preferable that the length of the linear through-cut groove is 20mm or more. Thus, when a load in the vertical direction acts on the cutout pattern, the protruding pieces and the peripheral portions of the protruding piece regions elastically deform toward the hole portions, and as a result of this deformation, the gaps between the adjacent protruding pieces (the width of the cutout portions) expand, and the proportion of the gaps between the protruding pieces increases, so that the body pressure of the seated person is well dispersed, the peripheral portions of the ischia bones are stably supported, and the seat stability is easily improved. Further, when a load (stress) due to a frontal offset acts on the opening edge portion of the hole portion and/or the direction of the inner wall of the hole portion, the protruding piece that is bent so as to cover the opening edge portion and/or the inner wall in front and the peripheral edge portion of the protruding piece region flexibly contact and support the leading edge portion of the ischia of the sitting person, so that the forward movement of the ischia is suppressed gently, and an improper situation such as a sudden increase in contact pressure with the anchor point and local obstruction of blood flow does not occur, and the effect of effectively suppressing the frontal offset is easily obtained.
Preferably, the dicing pattern includes a plurality of concentric circular non-through dicing grooves that do not penetrate the second resin layer and that center on intersections of the linear through dicing grooves. Accordingly, when a load in the vertical direction acts on the cut pattern, the projecting piece is easily elastically deformed toward the hole portion so as to cover at least a part of the opening edge of the hole portion of the first resin layer and/or the inner wall of the hole portion, and therefore, the reliability of the front shift suppression effect can be improved, and the body pressure dispersibility of the cut pattern can be further improved.
Preferably, the dicing pattern includes a plurality of concentric polygonal non-through dicing grooves that do not penetrate the second resin layer and that center on intersections of the linear through dicing grooves. Accordingly, when a load in the vertical direction acts on the cut pattern, the cut pattern is easily elastically deformed 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 in the first resin layer, and therefore, the reliability of the front shift suppression effect can be improved, and the body pressure dispersibility of the cut pattern can be further improved.
It is also preferable that the cutting pattern includes a through hole penetrating in the thickness direction of the second resin layer or a non-through hole opened on the side opposite to the first resin layer and not penetrating the second resin layer in a region between adjacent linear penetrating cutting grooves. As a result, the apparent hardness of the flap is reduced, the flap 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, and the change in the magnitude of the dispersion of the body pressure can be increased.
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 hole portion having a bottom or no bottom, and the second resin layer has, in at least a region facing the hole portion, at least one non-through cut pattern formed by at least three linear non-through cut grooves that are open on a side facing the first resin layer, do not penetrate the second resin layer, and intersect each other at predetermined intersection portions. The inter-groove region between adjacent linear non-through dicing grooves of the non-through dicing pattern and the peripheral portion of the inter-groove region continuous to the inter-groove region are configured to be elastically deformable. The inter-groove region and/or the peripheral portion of the inter-groove region are configured to be elastically deformed toward the hole portion so as to cover at least a part of the opening edge portion of the hole portion and/or the inner wall of the hole portion of the first resin layer when a load in the vertical direction acts on the non-penetrating cut pattern.
In the cushion material of the present invention, the first resin layer includes the hole portion, and the second resin layer laminated on the first resin layer includes the non-through cut pattern each including at least three cut grooves which do not penetrate in the thickness direction and intersect with each other. When a vertical load acts on the non-penetrating cut pattern, the adjacent inter-groove region and the peripheral portion of the inter-groove region of the non-penetrating cut pattern are elastically deformed toward the hole portion so as to cover at least a part of the opening edge of the hole portion of the first resin layer and/or the inner wall of the hole portion. Accordingly, the peripheral portions of the inter-groove regions and the inter-groove regions are bent downward to cover the opening edge portions and the periphery of the opening edge portions of the hole portions, so that the peripheral portions of the ischia are supported by the inter-groove regions and the peripheral portions of the inter-groove regions bent downward. Further, when a load acts in the horizontal direction of the frontal offset, the aforementioned body pressure dispersion and seat stability are maintained, and the peripheral portions of the inter-groove region and the inter-groove region that are curved so as to cover at least a part (anchoring point) of the front opening edge and/or the inner wall of the hole portion flexibly contact and support the front edge portions of the ischials of the seated person, so that the forward movement of the ischials is moderately suppressed, and inconveniences such as a rapid increase in contact pressure with the anchoring point and local obstruction of blood flow do not occur, and the frontal offset is effectively suppressed. As described above, according to the cushion material of the present invention, the seat stability and the effect of suppressing the front offset can be improved together while maintaining the predetermined body pressure distribution performance.
Preferably, the hole portion of the first resin layer is formed of a bottomless hole penetrating the first resin layer. This can further improve the seat stability.
It is also preferable that the resin composition further comprises 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 plurality of block elements defined by non-through grooves having openings on a surface opposite to the second resin layer, and the non-through grooves are formed deeper in a portion where a load in a vertical direction acting on the third resin layer is larger. This can further improve the dispersion of body pressure.
Preferably, the resin composition further includes a base layer made of a resin laminated on a surface of the first resin layer opposite to the second resin layer. Therefore, the mechanical strength of the cushion material can be improved, and the bottom-touching risk in the thickness direction can be reduced.
In this case, it is also preferable that at least one of the first resin layer, the second resin layer, and the base layer includes a hard portion made of resin foam harder than the resin constituting each layer at both longitudinal side end portions of the cushion material. This further improves the mechanical strength of the both side end portions of the cushion material, improves the stability in the left-right direction of the sitting posture of the user, and can further maintain the stable sitting posture.
It is also preferable that the adhesive layer is interposed at least between the first resin layer and the second resin layer. This fixes the first resin layer and the second resin layer to each other, and thus can reliably suppress the misalignment between the two layers. The adhesive layer may also be interposed between the second resin layer and the third resin layer, and/or between the base layer and the first resin layer.
Further preferably, 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. This can expand the change in the demand for the body pressure distribution performance of the cushion material. The third resin layer may be formed of a resin foam or a three-dimensional network structure.
Further preferably, the cushion material is a cushion material for a seat surface of a vehicle seat, a cushion material for a mattress, or a cushion material for a seat surface of a vehicle seat. When the cushion material is applied to a mattress, the predetermined dispersion of body pressure when lying on the mattress or when sitting on the mattress is maintained, and the improvement of the seat stability and the suppression of the front deviation is achieved, whereby the disturbance of the predetermined lying posture or sitting posture when lying on the mattress or when sitting on the mattress can be suppressed, and particularly the front deviation when the back of the mattress having the back lifting function is lifted can be suppressed.
Effects of the invention
According to the present invention, since the protruding pieces and the peripheral portions of the protruding piece regions are bent downward to cover at least a part of the opening edge portions of the hole portions and/or the inner walls of the hole portions, the peripheral portions of the ischia are supported by the protruding pieces and the peripheral portions of the protruding piece regions bent downward, and further, as the protruding pieces are bent and deformed, the gaps between the adjacent protruding pieces (the width of the cut portions) are expanded, and the ratio of the gaps between the protruding pieces is increased, so that the physical pressure of the seated person is favorably dispersed, the peripheral portions of the ischia are stably supported, and the seat stability is improved. Further, when a load acts in the horizontal direction of the frontal offset, the protruding piece and the protruding piece region peripheral portion that are bent so as to cover at least a part (anchoring point) of the front opening edge portion and/or the inner wall of the hole portion flexibly contact and support the front edge portion of the ischial bones of the sitting person while maintaining the above-described body pressure dispersibility and seat stability, and therefore, the forward movement of the ischial bones is moderately suppressed, and inconveniences such as a rapid increase in the contact pressure with the anchoring point and local blockage of blood flow do not occur, and the frontal offset is effectively suppressed. As described above, according to the cushion material of the present invention, the seat stability and the effect of suppressing the front offset can be improved together while maintaining the predetermined body pressure distribution performance.
Further, according to the present invention, since the inter-groove regions and the peripheral portions of the inter-groove regions are bent downward to cover the opening edge portions and the periphery of the opening edge portions of the hole portions, the peripheral portions of the ischia are supported by the inter-groove regions and the peripheral portions of the inter-groove regions bent downward, and further, as the inter-groove regions are bent and deformed, the widths of the adjacent inter-groove regions are expanded and the ratio of the gaps is increased, so that the physical pressure of the seated person is well dispersed and the peripheral portions of the ischia are stably supported, thereby improving the seat stability. Further, when a load acts in the horizontal direction of the frontal offset, the aforementioned body pressure dispersion and seat stability are maintained, and the peripheral portions of the inter-groove region and the inter-groove region that are curved so as to cover at least a part (anchoring point) of the front opening edge and/or the inner wall of the hole portion flexibly contact and support the front edge portions of the ischials of the seated person, so that the forward movement of the ischials is moderately suppressed, and inconveniences such as a rapid increase in contact pressure with the anchoring point and local obstruction of blood flow do not occur, and the frontal offset is effectively suppressed. As described above, according to the cushion material of the present invention, the seat stability and the effect of suppressing the front offset can be improved together while maintaining the predetermined body pressure distribution performance.
Drawings
Fig. 1 is an exploded perspective view schematically showing the structure of a cushion material of one embodiment of the present invention.
Fig. 2 is an exploded perspective view schematically showing the structure of the first resin layer and the second resin layer as the main structure of the seat cushion material of the embodiment of fig. 1.
Fig. 3 is an exploded perspective view schematically showing the structure of the first resin layer and the second resin layer as the main structure of the seat cushion material of the embodiment of fig. 1.
Fig. 4 is a sectional view taken along line a-a of fig. 5.
Fig. 5 is a plan view schematically showing the configuration of the seat cushion material according to the embodiment of fig. 1 when the second resin layer is not deformed and when the second resin layer is deformed.
Fig. 6 is a plan view showing a modification of the combination of the hole and the cut pattern in the seat cushion material according to the embodiment of fig. 1.
Fig. 7 is a plan view showing a modification of the cut pattern in the cushion material of the embodiment of fig. 1.
Fig. 8 is a plan view showing a modification of the cut pattern in the cushion material of the embodiment of fig. 1.
Fig. 9 is a plan view showing a modification of the cut pattern in the cushion material of the embodiment of fig. 1.
Fig. 10 is a plan view showing a modification of the cut pattern in the cushion material of the embodiment of fig. 1.
Fig. 11 is a plan view showing a modification of the cut pattern in the cushion material of the embodiment of fig. 1.
Fig. 12 is a plan view showing a modification of the cut pattern in the cushion material of the embodiment of fig. 1.
Fig. 13 is a plan view showing a modification of the hole in the seat cushion material according to the embodiment of fig. 1.
Fig. 14 is a diagram for explaining the effect of the cushion material of the embodiment of fig. 1.
Fig. 15 is a diagram for explaining the effect of the cushion material of the embodiment of fig. 1.
Fig. 16 is a diagram for explaining the effects of the modification of the embodiment of fig. 1.
Fig. 17 is a plan view and a sectional view showing the structure of the seat cushion material of the embodiment of fig. 1 and a modification thereof.
Fig. 18 is a perspective view showing an example in which the cushion material of the embodiment of fig. 1 is applied to a seating surface of a car seat.
Fig. 19 is an exploded perspective view schematically showing the structure of a cushion material according to another embodiment of the present invention.
Fig. 20 is a plan view and a side view showing the shape and size of the first resin layer in example 1 of the seat cushion material of the present invention.
Fig. 21 is a plan view and a side view showing the shape and size of the second resin layer in example 1 of the seat cushion material of the present invention.
Fig. 22 is a plan view, a front view, and a side view showing the shape and size of the third resin layer in embodiment 1 of the cushion material of the present invention.
Fig. 23 is a schematic diagram illustrating the configuration of a first comparative test measurement device in example 1, comparative example 1, and comparative example 2 of the cushion material of the present invention.
Fig. 24 is a characteristic diagram showing the measurement results of the front biasing force in example 1, comparative example 1, and comparative example 2 of the seat pad material of the present invention.
Fig. 25 is a pressure characteristic diagram showing the dispersion of body pressure in example 1, comparative example 1 and comparative example 2 of the cushion material of the present invention.
Fig. 26 is a pressure characteristic diagram showing the dispersion of body pressure at the anchor point in example 1, comparative example 1, and comparative example 2 of the cushion material of the present invention.
Detailed Description
The cushion material of the present invention is described below with reference to the drawings. Fig. 1 schematically shows the structure of a seat cushion material according to an embodiment of the present invention, fig. 2 and 3 schematically show the structures of a first resin layer and a second resin layer which are basic structures of the seat cushion material according to the embodiment, fig. 4 shows a cross section taken along line a-a of fig. 5, and fig. 5 schematically shows the structures of the second resin layer of the seat cushion material according to the embodiment when the second resin layer is not deformed or deformed.
As shown in these figures, the cushion material 10 of the present embodiment has the following structure: a first resin layer (ischial portion accommodating layer) 12 is laminated on a base layer 11 composed of a resin foam such as a urethane resin, etc., via an adhesive layer as necessary; a second resin layer (ischial support layer) 13 is laminated on the first resin layer 12, the lamination being necessarily performed via an adhesive layer; a third resin layer (body pressure dispersion-providing layer) 14 is laminated on the second resin layer 13 via an adhesive layer as needed.
The base layer 11 is formed by molding a resin foam such as a urethane resin into a flat plate shape, and is provided to improve the mechanical strength of the cushion material and prevent the seat occupant from touching. As the base layer 11, in addition to the urethane resin foam, a polyethylene resin foam, a polyolefin resin foam, a silicone resin foam, or the like can be used. Instead of the resin foam, the base layer 11 may be formed of a three-dimensional mesh structure, a hard cotton made of resin, a soft resin, or the like.
The first resin layer 12 includes at least one (one in the present embodiment) bottomed (non-penetrating) or bottomless (penetrating) hole portion 12a, and in a structure obtained by molding a resin foam such as a urethane resin into a flat plate shape, for example, the hole portion 12a is formed by cutting out by punching or the like, and is provided to stably support the ischial portion of the seated person and to form an anchor point for preventing anterior deviation. The hole 12a is formed by pressing a flat resin foam in the case of bottomless holes, and is formed by a method of foam molding the first resin layer 12 with a mold or a method of laminating and fixing a flat resin foam having a bottomless hole penetrating therethrough on a flat resin foam in the case of bottomed holes. In the present embodiment, the planar shape of the hole 12a is configured in the shape of two circles (perfect circles or ellipses) that are partially overlapped as shown in the drawing. However, the planar shape is not limited to this shape as long as it can support the ischial portion of the seated person, and various shapes as described below can be applied. In addition, the shape of the inner wall 12c of the hole 12a may be formed such that the hole shape is constant in the thickness direction in a plan view of the first resin layer 12, or may be formed such that the hole shape changes to a similar or dissimilar shape in the thickness direction. As the first resin layer 12, in addition to the urethane resin foam, a polyethylene resin foam, a polyolefin resin foam, a silicone resin foam, or the like can be used. The first resin layer 12 may be formed using a three-dimensional network structure, a hard cotton made of resin, a soft resin, or the like instead of the resin foam.
The second resin layer 13 is provided with at least one (two in the present embodiment) cut pattern 13a in a region facing the hole 12a of the first resin layer 12, and in a structure obtained by molding a resin foam such as a urethane resin into a flat plate shape, for example, the cut pattern 13a is formed by cutting out the cut pattern by pressing or the like, and is provided to support the ischial portion of the seated person and to disperse the pressure of the anchor point. As the second resin layer 13, in addition to the urethane resin foam, a polyethylene resin foam, a polyolefin resin foam, a silicone resin foam, or the like can be used. In addition, the second resin layer 13 may be configured using a three-dimensional network structure instead of the resin foam.
Each of the dicing patterns 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 converge and intersect with each other at predetermined intersection portions. That is, the linear through-cut grooves 13b of the cut pattern 13a extend radially from the intersection portion as a starting point, and end in a region within the hole 12a of the first resin layer. In the present embodiment, these linear through-cuts 13b are formed by through-cuts. Thus, the configuration using the through-cut facilitates the protruding piece and the peripheral portion of the protruding piece region to be bent downward when a load is applied, and covers the opening edge portion 12b of the hole portion 12a and/or the inner wall 12c of the hole portion 12a, so that the effect of the present invention can be efficiently exhibited. In addition, the linear penetration groove 13b can be efficiently and stably formed. The linear through cut groove 13b may be in the form of a cantilever-like protruding piece that can be formed into a cantilever-like shape by the linear through cut grooves 13b adjacent to each other, and the linear shape, the linear width, and the like are not limited, and include a linear shape, a curved shape such as a wavy shape or an arc shape, a shape in which the linear width is constant, or a shape in which the linear width varies in the longitudinal direction, and the like.
In the present embodiment, the two cutting patterns 13a are formed in a line-symmetrical shape with respect to a center line not shown. Although the description has been given of each of the cutting patterns 13a having eight linear through-cuts 13b, the present invention is not limited to this number of inventions, and each of the cutting patterns may have three to seven or nine or more linear through-cuts that intersect each other in a concentrated manner as described below, within the range that achieves the effects of the present invention. Further, one of the two cut patterns may be formed in a shape rotated with respect to the center, thereby forming a shape that is not line-symmetrical with respect to a center line, not shown.
The two cut patterns 13a in the present embodiment are arranged at mutually different positions in the region facing the hole 12a of the first resin layer 12. This improves the conformability to the shape of the buttocks of the user, and therefore, the body pressure dispersibility and the seat stability of the cushion material can be improved more favorably. In this case, it is desirable that the distance between the intersections of the linear through-cuts 13b in the two cut patterns 13a is 110 to 140 mm. This enables the ischial positions of the human body to be accurately reflected on the positions of the intersections of the linear through-cuts 13a in the second resin layer 13 based on a statistical database or the like, and therefore the effect of suppressing the anterior deviation of the seated person can be more accurately enhanced.
As is clear from fig. 5 a, the second resin layer 13 is configured such that a cantilever-like projecting piece 13c formed by a region between mutually adjacent linear through-cut grooves 13b of each cut pattern 13a and a projecting piece region peripheral portion 13d continuous with a root portion of the projecting piece 13c are elastically deformable (hereinafter, the cantilever-like projecting piece 13c is simply referred to as a flap 13c, and the projecting piece region peripheral portion 13d is simply referred to as a flap peripheral portion 13 d). In the present embodiment, eight petals 13c and petal peripheral portions 13d are formed by eight linear through-cut grooves 13 b. Thereby, the structure is as follows: when a load in the vertical direction acts on the cut pattern 13a (a state in which the user sits from the vertical direction, the same applies hereinafter), the flap 13c and the flap peripheral portion 13d are elastically deformed toward the hole portion 12a so as to cover the opening edge portion 12b of the hole portion 12a of the first resin layer 12 and/or the inner wall 12c of the hole portion 12a, and further, when a load (stress) due to a front offset acts in the opening edge portion 12b and/or the inner wall 12c direction of the hole portion 12a, the flap 13c and/or the flap peripheral portion 13d is compressively deformed in the opening edge portion 12b and/or the inner wall 12c direction of the hole portion 12a, specifically, supports the load while covering the anchor point 12d constituted by at least a part of the opening edge portion 12b and/or the inner wall 12c in the front.
The length of the linear through-cut groove 13b is desirably set to 20mm or more. With this setting, when a load in the vertical direction acts on the cutting pattern 13a, the flap 13c and the flap peripheral portion 13d are elastically deformed toward the hole portion 12 a. As shown in fig. 5B, the expansion between adjacent lobes (the width of the cut portion) and the ratio of the gap between the lobes due to the deformation increase, so that the physical pressure of the seated person is well dispersed, the peripheral portions of the ischia bones are stably supported, and the seat stability is easily improved. Further, when a load (stress) due to the frontal offset acts in the direction of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a, the curved flap and the flap peripheral portion covering at least a part (anchoring point) of the front opening edge portion and/or the inner wall of the hole portion 12a flexibly contact and support the front edge portion of the ischial bones of the seated person, so that the forward movement of the ischial bones is moderately suppressed, and an improper situation in which the contact pressure with the anchoring point sharply rises and the blood flow is blocked does not occur, and the effect of effectively suppressing the frontal offset is easily obtained.
The third resin layer 14 is formed by forming a plurality of block elements 14b, which are defined by a plurality of non-penetrating 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 urethane resin, and is provided to satisfactorily disperse the body pressure of the seated person. Such a configuration of the third resin layer 14 is known in, for example, patent documents 1 and 2 and the like. As the third resin layer 14, in addition to the urethane resin foam, a polyethylene resin foam, a polyolefin resin foam, a silicone resin foam, or the like can be used. The third resin layer 14 may be formed using a three-dimensional network structure, a hard cotton made of resin, a soft resin, or the like instead of the resin foam.
It is not necessary to fix the base layer 11 and the first resin layer 12 to each other. In the case of fixation, the fixation is performed by providing an adhesive layer between the two on the front surface or only a part thereof by coating an adhesive or attaching an adhesive film. The first resin layer 12 and the second resin layer 13 are fixed to each other. The entire surface or only a part of the surface between the both is fixed by applying an adhesive or attaching an adhesive film to provide an adhesive layer. It is not necessary to fix the second resin layer 13 and the third resin layer 14 to each other. In the case of fixation, the fixation is performed by providing an adhesive layer between the two on the front surface or only a part thereof by coating an adhesive or attaching an adhesive film. By fixing the base layer 11 and the first resin layer 12, the first resin layer 12 and the second resin layer 13, and the second resin layer 13 and the third resin layer 14 with the adhesive layers, the misalignment between the respective layers can be reliably suppressed.
In the present embodiment, the linear dicing groove is a through groove in the dicing pattern 13a, but as will be described later, the linear dicing groove may be a non-through groove (see fig. 17). When the linear cut groove is a through groove, the cut pattern 13a is formed by punching a flat plate-like resin foam, and when the linear cut groove is a non-through groove, the cut pattern is formed by half-cutting which is pushed in a non-through state by a punching blade, or by laminating and fixing a flat plate-like resin foam provided with a through groove on a flat plate-like 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 to each other, but the cushion material of the present invention may have a basic structure in which the first resin layer (ischial portion accommodating layer) 12 and the second resin layer (ischial support layer) 13 are laminated to each other via an adhesive layer. The base layer 11, the first resin layer 12, the second resin layer 13, and the third resin layer 14 are formed in a flat plate shape having a constant thickness, but may be formed in a partially different thickness within a range not to impair the operational effect of the present invention. In the present embodiment, each of the base layer 11, the first resin layer 12, the second resin layer 13, and the third resin layer 14 is configured as one component, but may be configured by combining members divided into a plurality of parts as long as the operational effects of the present invention are not impaired.
Fig. 6 shows a modification of the combination of holes and cut patterns in the cushion material of the present embodiment, and fig. 7 shows a modification of the cut patterns in the cushion material of the present embodiment.
As shown in fig. 6 a, two dicing patterns 23a may be provided at different positions in a region facing one hole 22a (substantially rectangular shape in this example) of the first resin layer, the two dicing patterns being line-symmetrical with respect to a center line (not shown). In this case, two cutting patterns 23a are provided, the two cutting patterns 23a being provided at positions opposed to the ischial bones of the seated person in each of two regions into which the hole portions 22a are bifurcated. Although not shown, three cutting patterns may be provided at positions facing three regions obtained by bisecting one hole portion (two of the cutting patterns are provided at positions facing the ischial bones of the seated person). Thus, the number of cut patterns provided in the second resin layer is increased, and the positions of the intersections of these cut patterns and the positions of the ischia bones of the seated person can be matched more accurately, so that the improvement in the body pressure distribution performance of the seated person and the effect of suppressing the forward displacement of the seated person can be further improved in a manner that closely corresponds to the body type of each person. As shown in fig. 6B, two cut patterns 33a may be provided in regions respectively opposed to the two holes 32a (substantially rectangular shape in this example) of the first resin layer, the cut patterns being symmetrical with respect to a center line (not shown). In this case, two cutting patterns 33a are provided at mutually different positions (positions opposing the ischial bones of the seated person) in the regions opposing the two hole portions 32a, respectively. Further, as shown in fig. 6C, one cut pattern 43a may be provided in a region facing one hole 42a (in this example, a substantially rectangular shape) of the first resin layer. In this case, one cutting pattern 43a is provided, and the one cutting pattern 43a is provided at a position opposite to the center portion of the hole portion 42 a. Still further, as shown in fig. 6(D), one cut pattern 53a may be provided so as to partially extend over a region facing one hole 52a (in this example, a band shape) of the first resin layer. Further, as shown in fig. 6E, three cut patterns 63a may be provided in regions facing the three holes 62a (in this example, substantially rectangular shapes) of the first resin layer. In this case, three cutting patterns 63a are provided at mutually different positions in the region opposed to the three hole portions 62a, respectively. However, two of the cutting patterns are symmetrical with respect to a center line, not shown, and are disposed at positions opposite to the ischial bones of the seated person. This can increase the change in the form of the cutting pattern, and can more appropriately and precisely adjust the position of the intersection of the linear through cutting grooves of the cutting pattern according to individual differences in the positions of the ischial bones and coccyx bones of the seated person, thereby further improving the body pressure distribution performance of the seated person and the effect of suppressing the forward displacement of the seated person.
As shown in fig. 7(a), the dicing pattern may be configured such that a through hole penetrating in the thickness direction of the second resin layer is provided at an intersection 73e where eight linear through-dicing grooves 73b obtained by penetrating cuts are concentrated and intersect. As shown in fig. 7(B), a through hole penetrating in the thickness direction of the second resin layer may be provided at an intersection portion 83e where eight linear through-cut grooves 83B obtained by wide through-cuts are concentrated and intersect. By providing the through-holes, the ratio of voids in the cut pattern region increases, and thus the body pressure distribution performance when seated can be further improved.
Fig. 8 shows a modification of the cut pattern in the cushion material of the present embodiment. Each of the cutting patterns shown in the figure is a case where the number of lobes is three.
As shown in fig. 8(a), the cutting pattern may be two cutting patterns 93a having a shape of line symmetry with each other, in which three linear through-cut grooves obtained by the through-cuts are concentrated and intersect at the intersection portion. As shown in fig. 8(B), the three linear through-cut grooves obtained by the through-cuts may be two cut patterns 103a having a shape symmetrical to each other, the two cut patterns being formed so as to be concentrated and intersected at an intersection portion and so as to have through holes penetrating in the thickness direction of the second resin layer at the intersection portion. Further, as shown in fig. 8(C) and 8(D), respectively, three linear through-cut grooves obtained by the through-cuts may be formed in a line-symmetrical shape in which the through-holes penetrating in the thickness direction of the second resin layer are provided at the intersection portion, and the intersection portion is widened and intersected with each other. Further, as shown in fig. 8(E), the three linear through-cuts obtained from the wide through-cuts may be two cut patterns 133a having a shape symmetrical to each other, the two cut patterns being formed so that three linear through-cuts are concentrated and intersect at an intersection portion. Further, as shown in fig. 8(F), three linear through-cut grooves obtained by the through-cuts may be formed so as to extend and intersect at an intersection portion, and a through-hole penetrating in the thickness direction of the second resin layer may be formed at the intersection portion, and two cut patterns 143a having a shape symmetrical to each other, in which a through-hole penetrating in the thickness direction of the second resin layer or a non-through-hole opening on the side opposite to the first resin layer and not penetrating the second resin layer may be formed in a region between adjacent linear through-cut grooves. By providing such a cut pattern 143a, the apparent hardness of the flap becomes small, and the flap is easily elastically deformed toward the hole portion so as to cover at least a part of the opening edge portion of the hole portion of the first resin layer and/or the inner wall of the hole portion, and the variation in the magnitude of the dispersion of the body pressure can be increased.
As shown in fig. 8G, the dicing pattern may be two dicing patterns 153a having a shape linearly symmetrical to each other, each having three linear through dicing grooves 153b obtained by penetrating cuts that are concentrated and intersect at an intersection portion, and a plurality of concentric polygonal-shaped (concentric triangular shape in the present embodiment) non-penetrating dicing grooves 153f that do not penetrate the second resin layer and are centered around the intersection portion of the linear through dicing grooves 153 b. Further, as shown in fig. 8H, three linear through-cut grooves 163b obtained by the through-cuts may be formed to extend and intersect at the intersection portion, and a through-hole penetrating in the thickness direction of the second resin layer may be formed at the intersection portion, and two cut patterns 163a having a shape symmetrical to each other may be further formed to include a plurality of concentric polygonal (in the present embodiment, concentric triangular) non-through-cut grooves 163f that do not penetrate the second resin layer with the intersection portion of the linear through-cut grooves 163b as the center. Further, as shown in fig. 8(I), three linear through-cuts 173b obtained by the through-cuts may be formed to extend and intersect at the intersection portion, and a through-hole penetrating in the thickness direction of the second resin layer may be formed at the intersection portion, and two cut patterns 173a may be formed to have a line-symmetrical shape with each other, further including a plurality of concentric non-through-cuts 173f not penetrating the second resin layer with the intersection portion of the linear through-cuts 173b as the center. By providing the cut patterns 153a, 163a, or 173a as described above, when a load in the vertical direction acts on the cut patterns, the flap is easily bent and deformed and the apparent hardness is also low, so that at least a part of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a is easily covered, and further, when a load (stress) due to the frontal shift acts in the direction of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a, the flap is supported in a state where the body pressure is low, so that the reliability of the frontal shift suppression effect can be improved, and further, since the apparent hardness of the cut patterns can be reduced, the body pressure distribution at the anchor point can be further improved.
Further, as shown in fig. 8(J), the cutting pattern may be provided with the following configuration: the resin composition comprises two cut patterns 183a in a line-symmetric shape in which three linear through-cut grooves 183b obtained by wide through-cuts are concentrated and crossed at a crossing portion, and a plurality of linear through-cut grooves or linear non-through-cut grooves 183g which are formed in parallel to a straight line connecting the crossing portions of the two cut patterns 183a, are separated from each other by a predetermined distance from the crossing portion, and penetrate the second resin layer. By providing such a cut pattern 183a and linear through-cut grooves or linear non-through-cut grooves 183g, the flap and flap peripheral portion are easily bent and deformed and the apparent hardness is low, so at least a part of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a is easily covered, and even when a load acts in the direction of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a, the support can be performed in a state where the body pressure is low, and therefore the front displacement suppression effect and the body pressure dispersibility can be further improved at the same time. Further, since the position of the intersection of the linear through cut groove or the linear non-through cut groove 183b and the position of the ischial bones of the seated person can be made to more appropriately and precisely oppose each other according to the human body ischial position data of each person, a customized cushion material that matches the body shape of each person can be produced, and the body pressure distribution performance of the seated person can be improved and the effect of suppressing the forward displacement of the seated person can be further improved according to the body shape of each person. In addition, when a plurality of linear through-cut grooves 183g penetrating through the second resin layer are provided, it is desirable to provide a structure in which a part of the lobes of the cut pattern 183a do not fall off. The linear non-through dicing grooves 153f, 163f, 173f, and 183G formed in fig. 8(G) to 8(J) may be formed on the surface side of the second resin layer, or may be formed on the side opposite to the hole 12 a. Instead of these linear non-through cut grooves 153f, 163f, 173f, and 183g, curved non-through cut grooves having a wavy shape, an arc shape, or the like may be formed.
Fig. 9 shows a modification of the cut pattern of the cushion material of the present embodiment. The cutting patterns shown in the figure are each a case where the number of lobes is four.
As shown in fig. 9(a) and 9(B), the cutting pattern may be two cutting patterns 193a and 203a having a line-symmetric shape in which four linear through-cut grooves obtained from wide through-cuts are concentrated and intersect at an intersection. As shown in fig. 9(C) and 9(D), the following configuration may be provided: two slit patterns 213a and 223b having a line-symmetric shape in which four linear through-cut grooves 213b and 223b obtained from wide through-cuts are concentrated and crossed at a crossing portion, and a plurality of linear through-cut grooves or linear non-through-cut grooves 213g and 223g that are formed in parallel to a straight line connecting between the crossing portions of the two slit patterns 213a and 223a and that penetrate the second resin layer at positions separated by a predetermined distance from the crossing portion or that do not penetrate the second resin layer. By providing such cut patterns 213a and 223a and linear through cut grooves or linear non-through cut grooves 213g and 223g, the flap and flap peripheral portion are easily bent and deformed and the apparent hardness is also low, so that at least a part of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a is easily covered, and even when a load acts in the direction of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a, the support can be performed in a state where the body pressure is low, and therefore, the front displacement suppression effect and the body pressure dispersibility can be further improved at the same time. Further, since the position of the intersection of the linear through cut groove or the linear non-through cut grooves 213g and 223g and the position of the ischial bones of the sitting person can be made to more appropriately and precisely correspond to the human body ischial position data of each person, a customized cushion material that matches the body shape of each person can be produced, and the improvement of the body pressure dispersion performance of the sitting person and the effect of suppressing the forward displacement of the sitting person can be further improved in accordance with the body shape of each person. In addition, in the case where a plurality of linear through-cut grooves 213g and 223g penetrating through the second resin layer are provided, it is desirable to have a structure in which some of the lobes of the cut patterns 213a and 223a do not fall off. The linear non-through dicing grooves 213g and 223g formed in fig. 9(C) and 9(D) may be formed on the surface side of the second resin layer, or may be formed on the side opposite to the hole 12 a. Instead of these straight non-through cut grooves 213g and 223g, curved non-through cut grooves having a wavy shape, an arc shape, or the like may be formed.
Fig. 10 shows a modification of the cut pattern of the cushion material of the present embodiment. Each of the cutting patterns shown in the figure is a case where the number of lobes is six.
As shown in fig. 10(a), the cutting pattern may be two cutting patterns 233a having a shape symmetrical to each other, in which six linear through-cut grooves obtained by the through-cuts are concentrated and intersect at the intersection portion. As shown in fig. 10(B), the six linear through-cut grooves obtained by the through-cuts may be two cut patterns 243a having a shape symmetrical to each other, the two cut patterns being formed so as to be concentrated and intersected at an intersection portion and so as to have through holes penetrating in the thickness direction of the second resin layer at the intersection portion. Further, as shown in fig. 10(C), the six linear through-cut grooves obtained by the through-cuts may be two cut patterns 253a that are line-symmetrical to each other and that are widened and cross at the crossing portions and that have through holes penetrating in the thickness direction of the second resin layer provided at the crossing portions. Further, as shown in fig. 10(D), the six linear through-cut grooves obtained by the through-cuts may be two cut patterns 263a having a shape that is not line-symmetrical to each other, the cut patterns being widened and intersecting at an intersection portion, and a through-hole penetrating in the thickness direction of the second resin layer being provided at the intersection portion. That is, one of the two cut patterns may be formed in a shape rotated with respect to the center, thereby forming a shape that is not line-symmetrical with respect to a center line, not shown. Further, as shown in fig. 10(E), the two cutting patterns 273a may be formed in a line-symmetrical shape in which six linear through-cuts obtained from wide through-cuts are concentrated and intersect at an intersection portion. Further, as shown in fig. 10(F), six linear through-cut grooves obtained by the through-cuts may be formed so as to extend and intersect at an intersection portion, and a through-hole penetrating in the thickness direction of the second resin layer may be formed at the intersection portion, and two cut patterns 283a having a shape symmetrical to each other, in which a through-hole penetrating in the thickness direction of the second resin layer or a non-through-hole opening on the side opposite to the first resin layer and not penetrating the second resin layer is formed in a region between adjacent linear through-cut grooves. By providing such a cutout pattern 283a, the flap apparent hardness becomes small, and the change in the magnitude of the body pressure dispersibility can be increased while being easily elastically deformed toward the hole portion so as to cover at least a part of the opening edge portion of the hole portion and/or the inner wall of the hole portion of the first resin layer, so that the front deflection suppressing effect can be further improved in a state where the body pressure at the anchor point is low, and the required range of the body pressure dispersibility performance for the cushion material can be expanded.
As shown in fig. 10G, the dicing pattern may be two dicing patterns 293a having a shape linearly symmetrical to each other, each including six linear through dicing grooves 293b obtained by through dicing, the six linear through dicing grooves 293b being concentrated and crossed at an intersection portion, and a plurality of concentric polygonal-shaped (in the present embodiment, concentric hexagonal-shaped) non-through dicing grooves 293f that do not penetrate through the second resin layer and are centered around the intersection portion of the linear through dicing grooves 293 b. Further, as shown in fig. 10H, six linear through-cut grooves 303b obtained by through-cuts may be formed to extend and intersect at an intersection portion, and a through-hole penetrating in the thickness direction of the second resin layer may be formed at the intersection portion, and two cut patterns 303a having a shape symmetrical to each other may be further formed, the two cut patterns including a plurality of concentric polygonal (in the present embodiment, concentric hexagonal) non-through-cut grooves 303f not penetrating the second resin layer with the intersection portion of the linear through-cut grooves 303b as the center. Further, as shown in fig. 10(I), six linear through-cut grooves 313b obtained by through-cutting may be formed to extend and intersect at the intersection portion, and a through-hole penetrating in the thickness direction of the second resin layer may be formed at the intersection portion, and two cut patterns 313a may be formed to have a line-symmetrical shape with each other, further including a plurality of concentric non-through-cut grooves 313f not penetrating the second resin layer with the intersection portion of the linear through-cut grooves 313b as the center. By providing the cut patterns 293a, 303a, or 313a as described above, when a load in the vertical direction acts on the cut patterns, the flap is easily bent and deformed and the apparent hardness is also low, so that at least a part of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a is easily covered, and further, when a load (stress) due to the frontal shift acts in the direction of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a, the flap is supported in a state where the body pressure is low, so that the reliability of the frontal shift suppression effect can be improved, and further, since the apparent hardness of the cut patterns can be reduced, the body pressure distribution at the anchor point can be further improved.
Further, as shown in fig. 10(J), the cutting pattern may be provided with the following configuration: the resin composition includes two dicing patterns 323a having a line-symmetrical shape in which six linear through-cut grooves 323b obtained by wide through-cuts are concentrated and crossed at an intersection portion, and a plurality of linear through-cut grooves or linear non-through-cut grooves 323g formed in parallel to a straight line connecting intersection portions of the two dicing patterns 323a at positions separated by a predetermined distance from the intersection portion and penetrating the second resin layer. By providing such a cut pattern 323a and linear through cut grooves or linear non-through cut grooves 323g, the flap and flap peripheral portions are easily bent and deformed and the apparent hardness is also low, so at least a part of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a is easily covered, and even when a load due to the frontal offset acts in the direction of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a, the support can be performed in a state where the body pressure is low, and therefore the frontal offset suppression effect and the body pressure dispersibility can be further improved at the same time. Further, since the position of the intersection of the linear through cut groove or the linear non-through cut groove 323b and the position of the ischial bones of the seated person can be made to more appropriately and precisely oppose each other according to the human body ischial position data of each person, a customized cushion material that matches the body shape of each person can be produced, and the improvement of the body pressure distribution performance of the seated person and the effect of suppressing the forward displacement of the seated person can be further improved according to the body shape of each person. In addition, when a plurality of linear through-cut grooves 323g penetrating through the second resin layer are provided, it is desirable to have a structure in which some of the flaps of the cut pattern 323a do not fall off. The linear non-through dicing grooves 293f, 303f, 313f, and 323G formed in fig. 10(G) to 10(J) may be formed on the surface side of the second resin layer, or may be formed on the side opposite to the hole 12 a. Instead of these linear non-through cut grooves 293f, 303f, 313f, and 323g, curved non-through cut grooves having a wavy shape, an arc shape, or the like may be formed.
Fig. 11 shows a modification of the cut pattern of the cushion material of the present embodiment. Each of the cutting patterns shown in the figure is a case where the number of lobes is eight.
As shown in fig. 11(a), the cutting pattern may be two cutting patterns 333a having a shape of line symmetry with each other, in which eight linear through-cut grooves obtained by the through-cuts are concentrated and intersect at the intersection portion. As shown in fig. 11(B), the eight linear through-cut grooves obtained by the through-cuts may be two cut patterns 343a having a shape symmetrical to each other, the two cut patterns being formed so as to be concentrated and intersected at an intersection portion and so as to have through holes penetrating in the thickness direction of the second resin layer at the intersection portion. Further, as shown in fig. 11(C), the eight linear through-cut grooves obtained by the through-cuts may be formed into two cut patterns 353a which are formed so as to be line-symmetrical to each other, each of which has a cross portion that is widened and intersects with each other, and each of which has a through-hole that penetrates through the second resin layer in the thickness direction at the cross portion. Further, as shown in fig. 11(D), the eight linear through-cut grooves obtained by the through-cuts may be two cut patterns 353a which are not line-symmetrical to each other and which are widened at the intersection portion and intersect each other, and in which a through-hole penetrating in the thickness direction of the second resin layer is provided at the intersection portion. That is, one of the two cut patterns may be formed in a shape rotated with respect to the center, thereby forming a structure having a shape that is not line-symmetrical with respect to a center line, not shown. Further, as shown in fig. 11(E), the eight linear through-cuts obtained from the wide through-cuts may be two cut patterns 373a that are linearly symmetrical to each other and that are formed by concentrating and intersecting eight linear through-cuts at the intersection. Further, as shown in fig. 11(F), eight linear through-cut grooves obtained by the through-cuts may be formed so as to extend and intersect at the intersection portion, and a through-hole penetrating in the thickness direction of the second resin layer may be formed at the intersection portion, and two cut patterns 383a having a shape symmetrical to each other, in which a through-hole penetrating in the thickness direction of the second resin layer or a non-through-hole opening on the side opposite to the first resin layer and not penetrating the second resin layer may be formed in a region between the adjacent linear through-cut grooves. By providing such a cut pattern 383a, the flap apparent hardness becomes small, the flap is easily elastically deformed toward the hole portion so as to cover at least a part of the opening edge portion of the hole portion of the first resin layer and/or the inner wall of the hole portion, and the variation in the magnitude of the body pressure dispersibility can be increased, so that the front bias suppressing effect can be further improved in a state where the body pressure at the anchor point is low, and the required range of the body pressure dispersibility performance for the cushion material can be expanded.
As shown in fig. 11G, the dicing pattern may be two dicing patterns 393a having a shape linearly symmetrical to each other, each including eight linear through-dicing grooves 393b obtained by through-cuts that are concentrated and intersect at an intersection portion, and a plurality of concentric polygonal-shaped (concentric octagonal-shaped in the present embodiment) non-through dicing grooves 393f that do not penetrate through the second resin layer and that are centered around the intersection portion of the linear through-dicing grooves 393 b. Further, as shown in fig. 11H, the two dicing patterns 403a may be formed in a line-symmetrical shape with each other, in which eight linear through-cut grooves 403b obtained by the through-cuts are widened and intersect at the intersection portion, a through-hole penetrating in the thickness direction of the second resin layer is provided at the intersection portion, and a plurality of concentric polygonal-shaped (concentric octagonal-shaped in the present embodiment) non-through-cut grooves 403f that do not penetrate the second resin layer with the intersection portion of the linear through-cut grooves 403b as the center are further provided. Further, as shown in fig. 11(I), the two scribe patterns 413a may be formed in a line-symmetrical shape with each other, each including eight linear through-cuts 413b obtained by the through-cuts, each having a wide cross section and a through-hole penetrating in the thickness direction of the second resin layer provided at the cross section, and a plurality of concentric non-through-cuts 413f not penetrating the second resin layer centered around the cross section of the linear through-cuts 413 b. By providing the cut patterns 393a, 403a, and 413a as described above, when a load in the vertical direction acts on the cut patterns, the flap is easily bent and deformed and the apparent hardness is also low, so that at least a part of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a is easily covered, and further, when a load (stress) due to the frontal shift acts in the direction of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a, the flap can be supported in a state where the body pressure is low, so that the reliability of the frontal shift suppression effect can be improved, and further, since the apparent hardness of the cut patterns can be reduced, the body pressure dispersibility at the anchor point can be further improved.
Further, as shown in fig. 11(J), the cutting pattern may be provided with: eight linear through-cuts 423b obtained from wide through-cuts are formed into two cut patterns 423a having a line-symmetric shape in which the cut grooves are concentrated and crossed at the crossing portion, and a plurality of linear through-cuts which are formed in parallel to a straight line connecting the crossing portions of the two cut patterns 423a and which penetrate the second resin layer at positions separated by a predetermined distance from the crossing portion or linear non-through-cuts 423g which do not penetrate the second resin layer. By providing such a cut pattern 423a and linear through cut grooves or linear non-through cut grooves 423g, the flap and flap peripheral portions are easily bent and deformed and the apparent hardness is also low, so at least a part of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a is easily covered, and even when a load due to the frontal offset acts in the direction of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a, the support can be performed in a state where the body pressure is low, so the frontal offset suppression effect and the body pressure dispersibility can be further improved at the same time. Further, since the position of the intersection of the linear through cut groove or the linear non-through cut groove 423b and the position of the ischial bones of the seated person can be made to more appropriately and precisely oppose each other according to the data of the position of the ischial bones of the human body of each person, a customized cushion material that matches the body shape of each person can be produced, and the body pressure distribution performance of the seated person can be improved and the effect of suppressing the forward displacement of the seated person can be further improved according to the body shape of each person. In addition, when a plurality of linear through-cut grooves 423g penetrating through the second resin layer are provided, it is desirable to provide a structure in which some of the lobes of the cut pattern 423a do not fall off. The linear non-through cut grooves 393f, 403f, 413f, and 423G formed in fig. 11(G) to 11(J) may be formed on the surface side of the second resin layer, or may be formed on the side opposite to the hole 12 a. Instead of these linear non-through cut grooves 393f, 403f, 413f, and 423g, curved non-through cut grooves having a wavy shape, an arc shape, or the like may be formed.
Fig. 12 shows a modification of the cut pattern of the cushion material of the present embodiment. Each of the cutting patterns shown in the figure is a case where the number of lobes is twelve.
As shown in fig. 12(a), the cutting pattern may be two cutting patterns 433a having a shape symmetrical to each other, in which twelve linear through-cut grooves obtained by the through-cuts are concentrated and intersect at an intersection portion. As shown in fig. 12(B), the two scribe patterns 443a may be formed in a line-symmetrical shape in which twelve linear through-cuts obtained by the through-cuts are concentrated and intersect at an intersection portion, and a through-hole penetrating in the thickness direction of the second resin layer is provided at the intersection portion. Further, as shown in fig. 12(C), the two scribe patterns 453a may be formed in a line-symmetrical shape in which twelve linear through-cuts obtained by the through-cuts are widened and cross at the intersection portion, and a through-hole penetrating in the thickness direction of the second resin layer is provided at the intersection portion. Further, as shown in fig. 12(D), the two scribe patterns 463a may be formed in a shape that is not line-symmetrical with each other, in which twelve linear through-cuts obtained by the through-cuts are widened and cross at the crossing portion, and a through-hole penetrating in the thickness direction of the second resin layer is provided at the crossing portion. That is, one of the two cut patterns may be formed in a shape rotated with respect to the center, thereby forming a shape that is not line-symmetrical with respect to a center line, not shown. Further, as shown in fig. 12(E), the two cutting patterns 473a may be formed in a line-symmetrical shape in which twelve linear through-cuts obtained from wide through-cuts are concentrated and intersect at an intersection. Further, as shown in fig. 12(F), twelve linear through-cut grooves obtained by the through-cuts may be formed so as to extend and intersect at the intersection portion, and through-holes penetrating in the thickness direction of the second resin layer may be formed at the intersection portion, and two cut patterns 483a having a shape symmetrical to each other may be formed in a region between adjacent linear through-cut grooves, such that a through-hole penetrating in the thickness direction of the second resin layer or a non-through-hole opening on the side facing the first resin layer and not penetrating the second resin layer is formed. By providing such a cut pattern 483a, the flap apparent hardness becomes small, and the elastic deformation toward the hole portion is facilitated so as to cover at least a part of the opening edge portion of the hole portion of the first resin layer and/or the inner wall of the hole portion, and the change in the magnitude of the body pressure dispersibility can be increased, so that the front displacement suppression effect can be further improved in a state where the body pressure at the anchor point is low, and the required range of the body pressure dispersibility performance for the cushion material can be expanded.
As shown in fig. 12(G), the dicing pattern may be two dicing patterns 493a having a shape linearly symmetrical to each other, each of the two dicing patterns 493b having twelve linear through-dicing grooves 493b obtained by through-cuts that are concentrated and intersect at an intersection portion, and each of the two dicing patterns 493 including a plurality of concentric circular non-through dicing grooves 493f that do not penetrate through the second resin layer with the intersection portion of the linear through-dicing grooves 493b as the center. Further, as shown in fig. 12(H), the two dicing patterns 503a may be formed in a line-symmetrical shape with each other by widening twelve linear through-cut grooves 503b obtained by the through-cuts at intersections and providing through-holes penetrating in the thickness direction of the second resin layer at the intersections, and further by providing a plurality of concentric non-through-cut grooves 503f that do not penetrate the second resin layer around the intersections of the linear through-cut grooves 503 b. Further, as shown in fig. 12(I), the two dicing patterns 513a may be formed in a line-symmetrical shape with each other, in which twelve linear through-cuts 513b obtained by the through-cuts are widened and intersect at the intersection portion, and a through-hole penetrating in the thickness direction of the second resin layer is provided at the intersection portion, and a plurality of concentric non-through-cuts 513f that do not penetrate the second resin layer with the intersection portion of the linear through-cuts 513b as the center are further provided. By providing the cut patterns 493a, 503a, or 513a as described above, when a load in the vertical direction acts on the cut patterns, the flap is easily bent and deformed and the apparent hardness is also low, so that at least a part of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a is easily covered, and further, when a load (stress) due to anterior deviation acts in the direction of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a, the flap can be supported in a state where the body pressure is low, so that the reliability of the anterior deviation suppressing effect can be improved, and further, since the apparent hardness of the cut patterns can be reduced, the body pressure dispersibility at the anchor point can be further improved.
Further, as shown in fig. 12(J), the cutting pattern may be provided with the following configuration: two slit patterns 523a that are line-symmetric to each other and in which twelve linear through-cut grooves 523b obtained from wide through-cuts are concentrated and crossed at a crossing portion, and a plurality of linear through-cut grooves 523g that are formed in parallel to a straight line connecting between the crossing portions of the two slit patterns 523a, are separated from the crossing portion by a predetermined distance, and penetrate the second resin layer, or do not penetrate the second resin layer. By providing such a cut pattern 523a and linear through-cut grooves or linear non-through-cut grooves 523g, the flap and flap peripheral portions are easily bent and deformed and the apparent hardness is also low, so at least a part of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a is easily covered, and even when a load acts in the direction of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a, the support can be performed in a state where the body pressure is low, and therefore the front displacement suppression effect and the body pressure dispersibility can be further improved at the same time. Further, since the position of the intersection of the linear through cut groove or the linear non-through cut groove 523b and the position of the ischial bones of the seated person can be made to more appropriately and precisely oppose each other according to the data of the position of the ischial bones of the human body of each person, a customized cushion material that matches the body shape of each person can be produced, and the body pressure distribution performance of the seated person can be improved and the effect of suppressing the forward displacement of the seated person can be further improved according to the body shape of each person. In addition, in the case where a plurality of linear through-cut grooves 523g penetrating through the second resin layer are provided, it is desirable to have a structure in which some of the lobes of the cut pattern 523a do not fall off. The linear non-through dicing grooves 493f, 503f, 513f, and 523G formed in fig. 12(G) to 12(J) may be formed on the surface side of the second resin layer, or may be formed on the side opposite to the hole 12 a. Instead of these linear non-through cut grooves 493f, 503f, 513f, and 523g, curved non-through cut grooves, such as wavy or arc-shaped grooves, may be formed.
Fig. 13 shows a modification of the hole provided in the first resin layer of the cushion material of the present embodiment. The figure shows the front of the cushion material on the upper side in the figure.
As shown in fig. 13a, the hole may be a single hole 22a having a bottom (non-through) or a bottomless (through) with an elliptical planar shape, in which a position 25 corresponding to the ischial bones and a position 26 corresponding to the coccyx of the seated person are included in the hole. At least a part of the front opening edge and/or the inner wall of the hole 22a constitutes an anchor point 22 d. As shown in fig. 13B, a position 35 corresponding to the ischial bones of the seated person may be included in the hole, and a position 36 corresponding to the coccyx may be a single hole 32a with a bottom (non-through) or without a bottom (through) in a planar shape having an elliptical shape with a central portion recessed outside the hole. At least a part of the front opening edge and/or the inner wall of the hole 32a constitutes an anchor point 32 d. Further, as shown in fig. 13C, two holes 42a may be provided with a bottom (not penetrating) or no bottom (penetrating) having a circular planar shape, in which positions 45 corresponding to the ischial bones of the seated person are respectively included in the two holes and positions 46 corresponding to the coccyx are outside the holes. At least a part of the front opening edge and/or the inner wall of the hole 42a constitutes an anchor point 42 d. Further, as shown in fig. 13(D), one hole portion 52a may be provided with a bottom (non-through) or no bottom (through) having a rectangular planar shape in which a position 55 corresponding to the ischial bones of the seated person is included in the hole portion and a position 56 corresponding to the coccyx is outside the hole portion. At least a part of the front opening edge and/or the inner wall of the hole 52a constitutes an anchor point 52 d. Further, as shown in fig. 13E, one hole 62a may be provided with a bottom (non-through) or a bottomless (through) having a semicircular planar shape, in which a position 65 corresponding to the ischial bones and a position 66 corresponding to the coccyx of the seated person are included in the hole. At least a part of the front opening edge and/or the inner wall of the hole 62a constitutes an anchor point 62 d. Further, as shown in fig. 13(F), three holes 72a may be provided with a bottom (non-through) or no bottom (through) having a planar shape of a perfect circle or an ellipse, in which positions 75 corresponding to the ischial bones of the seated person are included in two holes, respectively, and positions 76 corresponding to the coccyx bones are included in the remaining holes. At least a part of the front opening edge and/or the inner wall of the two holes 72a constitutes an anchor point 72 d. Since the design values such as the ischial distance can be more appropriately and precisely matched with the ischial position data of the human body of each person, a customized cushion material can be produced that matches the body shape of each person, and the improvement of the body pressure distribution performance of the sitting person and the effect of suppressing the front displacement of the sitting person can be further improved according to the body shape of each person. The inner wall shape of each hole in fig. 13(a) to 13(F) may be formed so that the hole shape is constant in the thickness direction in a plan view of the first resin layer 12, or may be formed so that the hole shape changes to a similar or dissimilar shape in the thickness direction. In the case where a plurality of holes are formed as shown in fig. 13(C) and 13(F), the inner wall shapes of the respective holes may be different from each other.
Fig. 14 and 15 are views for explaining the action and effect of the cushion material of the present embodiment, in which fig. 15(B) to 15(E) show a cross section taken along line B-B of fig. 15 (a). The cushion material is a case where the linear through-cut grooves 13b of the cut pattern 13a of the second resin layer 13 extend radially from the intersection portion as a starting point and terminate in the hole portion 12a of the first resin layer.
As shown in fig. 14, when the occupant 17 is seated on the portion of the hole portion 12a of the seat cushion material 10 of the present embodiment, the flap 13c and the flap peripheral portion 13d in the cut pattern 13a of the second resin layer 13 are elastically deformed toward the hole portion 12a so as to cover at least a part of the opening edge portion of the hole portion 12a and/or the inner wall of the hole portion of the first resin layer 12 due to the vertical load. Fig. 15(B) to 15(E) show the case where the petals 13c and the petal peripheral portions 13d are elastically deformed in stages due to a vertical load and a load in the horizontal direction next to the vertical load. As described above, since the flaps 13c and flap peripheral portions 13d bend downward to cover the opening edge portions 12b of the hole portions 12a, the body pressure of the seated person is well dispersed at the portions, and the ratio of the gap between the adjacent flaps 13c (the width of the cut portion) expands and the gap between the flaps 13c increases (not shown) with the bending deformation of the flaps 13c, so that the body pressure dispersion performance is further improved, and the peripheral portions 17a of the ischial bones are stably supported, and the seat stability is improved. Further, since the curved flap 13c and flap peripheral portion 13d covering the anchoring point 12d formed by at least a part of the front opening edge portion and/or the inner wall flexibly contact and support the front edge portion of the ischial bones of the seated person, the forward movement of the ischial bones is gently suppressed, and the anterior offset is effectively suppressed without causing an inconvenience such as a rapid increase in the contact pressure with the anchoring point 12d and local obstruction of the blood flow. Further, the following configuration is obtained depending on the combination conditions and load conditions of the shapes and sizes of the hole 12a, the flap 13c, and the flap peripheral portion 13 d: a case where the flap 13c and the flap peripheral portion 13D contact the opening edge portion 12b of the hole portion 12a but do not contact the inner wall 12c as in fig. 15(D), a case where they contact the opening edge portion 12b and partially or entirely contact the inner wall 12c as in fig. 15(E), or the like. When the flap 13c and the flap peripheral portion 13D do not entirely contact the inner wall 12c, as shown in fig. 15(D) and 15(E), a gap is formed between the inner wall 12c and the flap 13c and the flap peripheral portion 13D, and the gap functions to improve the body pressure distribution performance. As described above, according to the cushion material 10 of the present embodiment, while maintaining a predetermined body pressure distribution performance, it is possible to improve both the seat stability and the effect of suppressing the front offset. When the flap peripheral portion 13D has high hardness, as shown in fig. 15(D), the upper end portion of the curved flap peripheral portion 13D also functions as an anchor point 12 e.
Fig. 16 is a diagram for explaining the operation and effect of a modification of the present embodiment. Fig. 16(B) to 16(E) show cross sections taken along line C-C in fig. 16 (a).
In this modification, the linear through-cut groove 13b 'of the cut pattern 13 a' of the second resin layer is long, and a part thereof protrudes to the outside of the hole 12a of the first resin layer. That is, the linear through-cut grooves 13b 'of the cut pattern 13 a' extend radially from the intersection as a starting point, and the end is located in a region outside the hole 12a of the first resin layer. As is apparent from fig. 16(B) to 16(E) showing the case where the petals 13c 'of the cutting pattern 13 a' are elastically deformed in stages due to a vertical load and a load in the horizontal direction next to the vertical load, in this modification, the petals 13c 'are also bent downward and cover the opening edge portions of the hole portions 12a, so the body pressure of the seated person at this portion is well dispersed, and as the petals 13 c' are bent and deformed, the inter-adjacent petals 13c '(the width of the cut portions) expand and the ratio of the gaps between the petals 13 c' increases (not shown), so the body pressure dispersion performance is further improved, while the peripheral portions of the ischia are stably supported, and the seat stability is improved. Further, since the curved flap 13 c' covering the anchoring point 12d formed by at least a part of the front opening edge and/or the inner wall flexibly contacts and supports the front edge portion of the ischial bones of the seated person, the forward movement of the ischial bones is gently suppressed, and the forward displacement is effectively suppressed without causing an inconvenience such as a rapid increase in the contact pressure with the anchoring point 12d or local obstruction of blood flow. Further, the following configuration is obtained depending on the combination conditions and load conditions of the shape and size of the hole 12a and the flap 13 c': a case where the flap 13 c' contacts the opening edge portion 12b of the hole portion 12a but does not contact the inner wall 12c as in fig. 16(D), a case where it contacts the opening edge portion 12b and partially or entirely contacts the inner wall 12c as in fig. 16(E), or the like. In the case where the flap 13c 'does not contact the inner wall 12c over the entire surface, as shown in fig. 16(D) and 16(E), a gap is formed between the inner wall 12c and the flap 13 c', and the gap functions to improve the body pressure distribution performance. In this way, the cushion material according to this modification can also improve the seat stability and the effect of suppressing the front offset while maintaining the predetermined body pressure distribution performance. When the flap 13c ' has high stiffness, as shown in fig. 16(D), the upper end of the curved flap 13c ' serves as an anchor point 12e '.
Fig. 17 shows the structure of the seat cushion material and the modification thereof in comparison, in which (a) shows the plane and D-D line cross section of the first resin layer 12 and the second resin layer 13 in the present embodiment, and (B) shows the plane and E-E line cross section of the first resin layer 12 "and the second resin layer 13" in the modification.
In the seat cushion material of the present embodiment, as shown in fig. 17(a), the second resin layer 13 includes a cut pattern 13a in a region facing the hole 12a of the first resin layer 12, and the cut pattern 13a is formed of a plurality of linear through-cut grooves 13b as through-cuts. With this configuration, the petals 13c and the petal peripheral portions 13d, which are the regions between the adjacent linear through-cut grooves 13b of the cut pattern 13a, are bent toward the hole portion 12a so as to cover at least a part of the opening edge portion 12b of the hole portion 12a of the first resin layer 12 and/or the inner wall 12c of the hole portion 12a and elastically deformed, and the opening edge portion periphery of the hole portion 12a are covered, so that the ischial peripheral portions are supported by the petals 13c and the petal peripheral portions 13d bent downward, and further, the ratio of the expansion between the adjacent petals 13c (the width of the cut portions) and the gap between the petals 13c is increased in accordance with the bending deformation of the petals 13c, whereby the physical pressure of the seated person is well dispersed and the ischial peripheral portions are stably supported, and the seat stability is improved. Further, when a load (stress) due to the frontal offset acts in the direction of the opening edge portion 12b and/or the inner wall 12c of the hole portion 12a, the curved flap 13c and flap peripheral portion 13d covering at least a part (anchoring point) of the opening edge portion and/or the inner wall in front flexibly contact and support the front edge portion of the ischial bones of the seated person, so that the forward movement of the ischial bones is moderately suppressed, and an inconvenience such as a rapid increase in the contact pressure with the anchoring point and local obstruction of blood flow does not occur, and the frontal offset is effectively suppressed.
In contrast, in the seat cushion material according to the modification, as shown in fig. 17(B), the second resin layer 13 "includes the non-through cut pattern 13 a" in a region facing the hole 12a "of the first resin layer 12", and the non-through cut pattern 13a "is configured by a plurality of linear non-through cut grooves 13B" which are non-through cuts that open the side of the hole 12a ". With such a configuration, the inter-groove region 13c ″ of the non-through cut pattern 13a ″ and the inter-groove region peripheral portion 13d ″ continuous to the inter-groove region 13c ″ are bent toward the hole portion 12a ″ so as to cover at least a part of the opening edge portion 12b ″ of the hole portion 12a ″ of the first resin layer 12 ″ and/or the inner wall 12c ″ of the hole portion a ″ and elastically deform, and the peripheral portions of the ischial bones are supported by the inter-groove region and the inter-groove region peripheral portion bent downward because at least a part of the opening edge portion and/or the inner wall of the hole portion 12a ″ is covered, and further, as the inter-groove region is bent and deformed, the widths of the adjacent inter-groove regions are expanded and the ratio of the gaps is increased, so that the body pressure of the seated person is well dispersed and the peripheral portions of the ischial bones are stably supported, thereby improving the. Further, when a load (stress) due to the frontal offset acts in the direction of the opening edge portion 12b ″ and/or the inner wall 12c ″ of the hole portion 12a ″, the curved inter-groove region 13c ″ and the inter-groove region peripheral portion 13d ″ covering at least a part (anchoring point) of the opening edge portion and/or the inner wall in front flexibly contact and support the front edge portion of the ischial bones of the seated person, so that the forward movement of the ischial bones is moderately suppressed, and an inconvenience such as a rapid increase in contact pressure with the anchoring point and local obstruction of blood flow does not occur, and the frontal offset is effectively suppressed. In the cushion material of the present invention, the cut pattern in all of the above modifications and variations may be constituted by a non-through cut pattern having linear non-through cut grooves obtained by using such non-through cuts. In addition, although the linear non-through dicing groove 13b "is linear in this embodiment, it may be in a curved shape such as a linear shape, a wavy shape, or an arc shape, or in a shape in which the line width is constant or varies in the longitudinal direction, as long as the inter-groove region 13 c" is formed by the linear non-through dicing grooves adjacent to each other.
Fig. 18 shows an example in which the seat cushion material of the present embodiment is applied to a seat face of a car seat.
As shown in the figure, the cushion material of the present embodiment is applied to the vehicle seat by placing the cushion material having the basic structure of the first resin layer (ischial portion-containing layer) 12 having the hole portions 12a and the second resin layer (ischial support layer) 13 having the cutout pattern 13a on the seat surface 18a of the vehicle seat 18, whereby the seat stability and the front offset suppression effect can be improved while maintaining the predetermined body pressure dispersion performance. The cushion material of the present embodiment can be applied to a cushion material for a mattress or a cushion material for a seat surface of a vehicle seat. When the cushion material is applied to a mattress, the seat stability and the front offset suppression can be improved while maintaining a predetermined body pressure distribution when lying on the mattress or when sitting on the mattress, and disturbance of a predetermined lying posture or a seat posture when lying on the mattress or when sitting on the mattress can be suppressed, and particularly the front offset when the back of the mattress having a back lifting function is lifted can be suppressed. Even in the case of a cushion material applied to a seat surface of a vehicle seat, the seat stability and the front offset suppression effect can be improved while maintaining a predetermined body pressure distribution performance.
Fig. 19 schematically shows the structure of a cushion material according to another embodiment of the present invention.
As shown in the drawing, the cushion material of the present embodiment has the following structure: a first resin layer (ischial portion accommodating layer) 12 is laminated on a base layer 21 composed of a resin foam such as a urethane resin, etc., via an adhesive layer as necessary; a second resin layer (ischial support layer) 13 is laminated on the first resin layer 12, the lamination being necessarily performed via an adhesive layer; a third resin layer (body pressure dispersion-providing layer) 14 is laminated on the second resin layer 13 via an adhesive layer as needed.
The base layer 21 is formed by molding a resin foam such as a urethane resin into a flat plate shape, and is provided to improve the mechanical strength of the cushion material and prevent the seat occupant from touching. The base layer 21 is provided at both longitudinal end portions thereof with hard portions 21a made of synthetic resin foam that is harder than the synthetic resin foam constituting the base layer. This further improves the mechanical strength of the both side end portions of the cushion material, improves the stability of the user's sitting posture in the right-left direction, and can maintain a stable sitting posture even in applications other than a seat. In a modification of the present embodiment, a hard portion similar to the base layer 21 may be provided in the first resin layer 12 and/or the second resin layer 13.
The other first resin layer 12, second resin layer 13, and third resin layer 14 in this embodiment have the same structure, operation, and effects as those in the above embodiment, and therefore, detailed description thereof is omitted.
Examples
Comparative tests of example 1, comparative example 1 and comparative example 2 of the cushion material of the present invention are described below.
(example 1)
A laminated body (cushion material) having a basic structure in which the first resin layers (ischial portion accommodating layers) 12 and the second resin layers (ischial support layers) 13 shown in fig. 2 to 5 are laminated via adhesive layers is prepared, and the base layer 11 is laminated via an adhesive under the first resin layers (ischial portion accommodating layers) 12 of the laminated body, and the third resin layers 14 (body pressure dispersion layers) are laminated on the second resin layers 13 without being bonded, thereby preparing the cushion material having the structure of fig. 1. As a constituent material, a polyurethane resin foam (manufactured by DONGYANG クオリティワン Inc., type 33H rubber-like, hardness 190N according to JIS K6400-2A) was used. As the base layer 11, a rectangular layer having dimensions of 400mm × 400mm × 20mm was used. As the first resin layer 12, a layer having the shape and size shown in fig. 20 is used. As the second resin layer 13, a layer having the shape and size shown in fig. 21 is used. As the third resin layer 14, a layer having the shape and size shown in fig. 22 is used. The overall thickness is 75 mm. Further, the unit of the size in fig. 20 to 22 is mm.
Comparative example 1
A conventional cushion material アルファプラクッション (model KC-WP4040) of the present applicant was used. This cushion material is a cushion material described in patent document 2, and is configured by laminating a low-rebound polyurethane layer on a body pressure distribution-imparting layer (corresponding to the third resin layer 14 shown in fig. 1) made of a polyurethane resin foam having a plurality of block elements divided by a plurality of non-penetrating grooves on the upper surface. The overall thickness is 60 mm.
Comparative example 2
A cushion material having the same structure as that of the cushion material of example 1 was produced, except that the second resin layer of the cushion material of example 1 had no cut pattern and had a flat surface without irregularities or holes. As a constituent material, a polyurethane resin foam (manufactured by QUALITY ONE, DONG, N., model number: rubber-like 33H, hardness 190N according to JIS K6400-2A) was used. The overall thickness is 75 mm.
(first comparative test)
In order to verify the effect of suppressing the front offset of the cushion material, the tensile force was measured in the examples, comparative examples 1 and 2 by using a measuring device for a comparative test shown in fig. 23. As shown in the figure, a cushion material C (10) to be verified is placed on a carriage T which is movable in the horizontal direction, a seat surface contact plate P which simulates that the buttocks rise to the backs of the thighs in a sitting posture is provided on the upper surface of the cushion material C (10), weights (10, 15, 20, 25, 30kg) are placed on the seat surface contact plate P via a rod S which is supported so as to be movable in the vertical direction by a support frame F, a vertical load is applied, and the carriage T is pulled in the horizontal direction at a constant speed (50 mm/sec) via a digital dynamometer G, whereby the peak value of the tensile force indicated by the digital dynamometer G is measured. The larger the peak value of the tensile force, the higher the load bearing capacity at the anchor point, and the more excellent the front deflection suppressing effect. The peak value was measured five times for each weight, and the average value was calculated. The results of the measurement are shown in table 1. The unit of the peak of the tensile force is kgf. In addition, as the seat surface contact plate P, a contact plate reduced in size to 70% in a shape prescribed in JIS S1203 is used. This is because of the size of the average japanese person.
TABLE 1
Figure BDA0002181251010000331
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, example 1, which is a laminate including a first resin layer (ischial portion accommodating layer) and a second resin layer (ischial support layer), has a larger pulling force under various vertical loads and an excellent front shift suppression effect than comparative example 1, which is a laminate without the first resin layer (ischial portion accommodating layer) and the second resin layer (ischial support layer), and comparative example 2, which is a laminate without a dicing pattern in the second resin layer.
(second comparative test)
In order to verify the dispersion of body pressure in a normal seat, the measurement of the dispersion performance of body pressure was performed for example 1, comparative example 1, and comparative example 2. This measurement was carried out by mounting a surface pressure sensor XSENSORPX100.36.36.02 manufactured by XSENSOR Technology Corporation on the seat surface of a vehicle seat (vehicle seat ミューフォー MYU4-22 manufactured by ミキ), seating a subject having a height of 170cm, a body weight of 65kg, and a BMI (obesity index) of 22.5 thereon, and measuring the surface pressure distribution 5 minutes after seating. In the figure, (a) is a measurement result of the cushion material of example 1, (B) is a measurement result of the cushion material of comparative example 1, and (C) is a measurement result of the cushion material of comparative example 2.
As is clear from fig. 25, in example 1 including the laminate including the first resin layer (ischial portion accommodating layer) and the second resin layer (ischial support layer), the body pressure is lower and the change is smaller over the entire seat surface and the body pressure distribution is remarkably excellent, as compared with comparative example 1 including no laminate including the first resin layer (ischial portion accommodating layer) and no second resin layer (ischial support layer) and comparative example 2 including no cut pattern in the second resin layer of the laminate.
(third comparative test)
In order to verify the body pressure distribution (body pressure increase suppression effect) at the anchor point (region) in the sitting posture with the sitting bones displaced forward (sitting posture in the forward displaced state), the cushion materials of example 1 and comparative example 2 were subjected to the measurement of the body pressure distribution performance in the sitting posture in the forward displaced state. This measurement was carried out by mounting a surface pressure sensor XSENSORPX100.36.36.02 manufactured by XSENSOR Technology Corporation on the seat surface of a vehicle seat (vehicle seat ミューフォー MYU4-22 manufactured by ミキ), seating a subject having a height of 170cm, a body weight of 65kg, and a BMI (obesity index) of 22.5 thereon, and measuring the surface pressure distribution 5 minutes after seating. In the figure, (a) is a measurement result of the cushion material of example 1, and (B) is a measurement result of the cushion material of comparative example 2.
As is clear from fig. 26, in example 1 in which the laminate including the first resin layer (ischial portion accommodating layer) and the second resin layer (ischial support layer) was provided, the maximum pressure in the anchor region was equal to each other, but the range of the maximum pressure was narrowed, and the effect of suppressing the increase in the body pressure at the anchor point was very excellent, as compared with comparative example 2 in which the second resin layer in the laminate of the first resin layer (ischial portion accommodating layer) and the second resin layer (ischial support layer) did not have a cut pattern.
As can be seen from the first to third comparative tests, in the case of the seat cushion material of example 1, the front offset suppressing effect and the body pressure dispersing performance at the time of sitting were both superior, and the seat stability and the effect of suppressing the increase in the body pressure in the anchor point region at the time of front offset suppression were superior, as compared with the seat cushion materials of comparative examples 1 and 2.
The embodiments described above are merely exemplary of the invention and are not intended to be limiting, and the invention may be embodied in other various modifications and variations. The scope of the invention is, therefore, indicated only by the appended claims and their equivalents.
Description of the symbols
10. C cushion material
11. 21 base layer 1
12. 12' first resin layer
12a, 12 a', 22a, 32a, 42a, 52a, 62a, 72a hole
12b, 12 b' opening edge
12c, 12 c' inner wall
12d, 12 e', 22d, 32d, 42d, 52d, 62d, 72d anchor points
13. 13' second resin layer
13a, 13 a', 23a, 33a, 43a, 53a, 63a, 93a, 103a, 113a, 123a, 133a, 143a, 153a, 163a, 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, 443a, 453a, 463a, 473a, 483a, 493a, 503a, 513a, 523a cutting pattern
13 a' non-through cutting pattern
13b, 13 b', 73b, 83b, 153b, 163b, 173b, 183b, 213b, 223b, 293b, 303b, 313b, 323b, 393b, 403b, 413b, 423b, 493b, 503b, 513b, 523b linear through-cut grooves
13 b' linear non-through cutting groove
13c, 13 c' Tabs (petals)
13 c' inter-groove region
13d peripheral edge of protruding sheet region (lobe peripheral edge)
13 d' peripheral portion of inter-groove region
14 third resin layer
14a non-penetrating groove
14b block elements
17 seated person
17a peripheral part of ischia
18 vehicle seat
18a seat surface
21a hard part
25. 35, 45, 55, 65, 75 corresponding to ischia
26. 36, 46, 56, 66, 76 corresponding to the coccyx
73e, 83e intersection
153f、163f、173f、293f、303f、313f、393f、403f、413f、493f
503f, 513f non-through cutting groove
183g, 213g, 223g, 323g, 423g, 523g linear non-through cut groove
F support stand
G digital dynamometer
P seat surface contact board
S rod
T flatbed
W pendant

Claims (30)

1. 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 portion with or without a bottom,
the second resin layer includes at least one cut pattern formed by at least three linear through-cut grooves penetrating in a thickness direction of the second resin layer and crossing each other at predetermined crossing portions in at least a region facing the hole portion,
cantilever-like projecting pieces formed by the regions between the linear through-cut grooves adjacent to each other in the cut pattern and peripheral portions of projecting piece regions continuous to the root portions of the projecting pieces are configured to be elastically deformable,
the protruding piece and/or the protruding piece region peripheral portion are configured to be elastically deformed toward the hole portion so as to cover at least a part of an opening edge portion of the hole portion and/or an inner wall of the hole portion when a load in a vertical direction acts on the cut pattern.
2. The cushion material according to claim 1, wherein the linear through-cut grooves are formed by through-cuts.
3. The cushion material according to claim 1 or 2, wherein the two cut patterns are arranged at mutually different positions in a region opposed to the hole portion.
4. 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 110mm to 140 mm.
5. The cushion material according to claim 3, wherein the second resin layer includes a plurality of linear through-cut grooves that are formed in parallel to a straight line connecting intersection portions of the linear through-cut grooves in the two cut patterns and that penetrate the second resin layer at positions separated by a predetermined distance from the intersection portions, or linear non-through-cut grooves that do not penetrate the second resin layer.
6. The cushion material according to claim 1 or 2, wherein three of the cut patterns are arranged at mutually different positions in a region opposed to the hole portion.
7. The cushion material as claimed in claim 1 or 2, wherein, for the cut pattern,
one cutting pattern provided at a position opposing the center portion of the hole portion, two cutting patterns provided at positions opposing the ischial bones of the occupant in each of two regions obtained by dividing the hole portion in two, or three cutting patterns provided at positions opposing three regions obtained by dividing the hole portion in three, wherein the two cutting patterns are provided at positions opposing the ischial bones of the occupant, and in the case of two hole portions, the two cutting patterns are provided at positions opposing the ischial bones of the occupant in each of the two hole portions,
in the case where the hole portions are three, there are three cutting patterns provided at positions opposed to each of the three hole portions, two of which are provided at positions opposed to the ischial bones of the seated person.
8. The cushion material according to claim 1 or 2, wherein the linear through-cut grooves have a length of 20mm or more.
9. The seat cushion material according to claim 1 or 2, wherein the cut pattern includes a plurality of concentric circular non-through cut grooves that do not penetrate the second resin layer, with the intersection of the linear through cut grooves as a center.
10. The seat cushion material according to claim 1 or 2, wherein the cut pattern includes a plurality of concentric polygonal non-through cut grooves that do not penetrate the second resin layer, with the intersection of the linear through cut grooves as a center.
11. The cushion material according to claim 1 or 2, wherein a through hole penetrating in a thickness direction of the second resin layer or a non-through hole opening on a side opposite to the first resin layer and not penetrating the second resin layer is provided in a region between the linear through-cut grooves adjacent to each other in the cut pattern.
12. The seat cushion material according to claim 1 or 2, wherein the hole portion of the first resin layer is constituted by a bottomless hole penetrating the first resin layer.
13. The cushion material according to claim 1 or 2, further comprising 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 plurality of block elements defined by non-penetrating grooves having openings on a surface opposite to a surface facing the second resin layer, the non-penetrating grooves being formed deeper in a portion where a load in a vertical direction acting on the third resin layer is larger.
14. The seat cushion material according to claim 1 or 2, further comprising a base layer made of a resin laminated on a surface of the first resin layer opposite to the second resin layer.
15. The seat cushion material according to claim 14, wherein at least one of the first resin layer, the second resin layer, and the base layer includes a hard portion made of resin foam that is harder than the resin constituting each layer at both longitudinal direction side end portions of the seat cushion material.
16. The cushion material as claimed in claim 1 or 2, wherein an adhesive layer is interposed at least between the first resin layer and the second resin layer.
17. The cushion material as claimed in claim 14, 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.
18. The cushion material according to claim 1 or 2, which is a cushion material for a seat surface of a vehicle seat.
19. A cushion material according to claim 1 or 2, which is a cushion material for a mattress.
20. A seat cushion material according to claim 1 or 2, which is a seat cushion material for a seat surface of a vehicle seat.
21. 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 portion with or without a bottom,
the second resin layer includes, in at least a region facing the hole, at least one non-through cut pattern formed by at least three linear non-through cut grooves that are open on a side facing the first resin layer, do not penetrate the second resin layer, and intersect each other at predetermined intersection portions,
an inter-groove region between the linear non-through cut grooves adjacent to each other in the non-through cut pattern and an inter-groove region peripheral portion continuous to the inter-groove region are configured to be elastically deformed,
the inter-groove region and/or the peripheral portion of the inter-groove region is configured to be elastically deformed toward the hole portion so as to cover at least a part of an opening edge portion of the hole portion and/or an inner wall of the hole portion when a load in a vertical direction acts on the non-penetrating cut pattern.
22. The seat cushion material according to claim 21, wherein the hole portion of the first resin layer is formed of a bottomless hole penetrating the first resin layer.
23. The cushion material according to claim 21 or 22, further comprising 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 plurality of block elements defined by non-penetrating grooves having openings on a surface opposite to a surface facing the second resin layer, the non-penetrating grooves being formed deeper in a portion where a load in a vertical direction acting on the third resin layer is larger.
24. The seat cushion material according to claim 21 or 22, further comprising a base layer made of a resin laminated on a surface of the first resin layer opposite to the second resin layer.
25. A seat cushion material according to claim 24, wherein at least one of the first resin layer, the second resin layer, and the base layer includes a hard portion made of resin foam that is harder than the resin constituting each layer at both longitudinal side end portions of the seat cushion material.
26. The cushion material as claimed in claim 21 or 22, wherein an adhesive layer is interposed at least between the first resin layer and the second resin layer.
27. A seat cushion material according to claim 24, 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.
28. A seat cushion material according to claim 21 or 22, which is a seat cushion material for a seat of a vehicle seat.
29. A cushion material according to claim 21 or 22, which is a cushion material for a mattress.
30. A seat cushion material according to claim 21 or 22, which is a seat cushion material for a seat of a vehicle seat.
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