Pad material, seating seat, and vehicle seat

Abstract

The present invention provides a cushion material, a seating seat, and a vehicle seat, which are environmentally friendly, improve seating comfort, and do not bring discomfort to a seated person. The cushion material (10) is used for a seating seat (S) and supports a seated person. The cushion material (10) is provided with: a base part (21) for supporting a seated person; a side section (31) disposed on the outer side of the base section (21) in the seat width direction; and an extending part (32) extending from the side part (31) to the seated person side and supporting the seated person from the side. In the backing material (10), the entire extension part (32) is formed from biomass carbamate, and at least a portion of the base part (31) is formed from a material that is softer than the biomass carbamate.

Description

Technical Field

[0001] The present invention relates to a cushion material, a seat and a seat for a vehicle, and in particular to a cushion material for a seat, a seat and a seat for a vehicle. Background Art

[0002] In recent years, environmentally friendly biomass urethane has been developed. Biomass urethane is a urethane foam made of raw materials containing biomass resources such as renewable plants. Cushion components containing biomass urethane can be applied to various parts such as vehicle seats, cushions, sofas, door linings, etc.

[0003] For example, in a vehicle seat described in Patent Document 1, a cushion material includes: a first cushion component including biomass urethane; and a second cushion component including urethane foam. The cushion material is composed of cushion components having different hardnesses, so that deformation of the first cushion component including biomass urethane can be suppressed by the second cushion component that is less likely to deform than the first cushion component.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2023-001020 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, since the cushion material as in Patent Document 1 is composed of cushion members having different hardnesses, there is a concern that the boundary between the cushion members may give the seated person a sense of discomfort.

[0009] Furthermore, when the cushion material is entirely or partially formed of biomass urethane, which is harder than urethane foam, it is environmentally friendly, but further improvement in seating comfort is required.

[0010] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cushion material, a seat, and a vehicle seat that improve the sitting comfort while being environmentally friendly and does not cause discomfort to the seated person.

[0011] Technical means of solving problems

[0012] The above-mentioned problem is solved by the following manner: According to the cushion material of the present invention, it is used for a seated chair and is used to support a seated person. The cushion material has: a base portion, which supports the seated person; a side portion, which is arranged on the outer side of the base portion in the seat width direction; and an extension portion, which extends from the side portion to the seated person side and supports the seated person from the side. In the cushion material, the entire extension portion is formed of biomass carbamate, and at least a part of the base portion is formed of a material that is softer than biomass carbamate.

[0013] According to the above structure, it is possible to realize a cushion material which is environmentally friendly, improves the sitting comfort and does not cause discomfort to the seated person.

[0014] Specifically, by using environmentally friendly biomass urethane for the extension portion, an environmentally friendly cushion material can be realized, and by using urethane foam, which is softer than biomass urethane, for the seat surface, the seating comfort can be improved.

[0015] Furthermore, since the entire extension portion is formed of high-hardness biomass urethane, the boundary portion of the cushion pad member is not exposed at the extension portion, thereby preventing the seated person from feeling uncomfortable and improving the seating comfort.

[0016] In this case, in the cushion material, the protruding portion and the side portion may be entirely formed of biomass urethane.

[0017] According to the above structure, the entire extension part and the side part are formed of high-hardness biomass urethane, so that the rigidity of the extension part and the side part can be improved, the sitting comfort can be improved, and the support feeling of the cushion material can be improved.

[0018] At this time, the side portion may be arranged adjacent to the base portion, and a boundary portion between the base portion and the side portion may extend from a seating surface of the cushion material toward a back surface opposite to the seating surface and extend orthogonally to the seating surface of the cushion material.

[0019] According to the above configuration, since the protruding portion and the side portion formed of the biomass urethane are not provided on the seat surface, it is possible to suppress a decrease in the seating comfort due to the high hardness of the biomass urethane.

[0020] In this case, the cushion material may be used for a seat cushion of the seat, the base portion may support the seated person from below, and the extension portion may be formed to have a substantially U-shape in a top view and surround the base portion.

[0021] According to the above configuration, by providing the highly rigid protruding portion around the base portion, the sitting comfort can be improved and the support feeling of the cushion material can be enhanced.

[0022] In this case, the extended portion of the cushion material may be formed at both ends of the base portion in the seat width direction and at a rear end of the base portion.

[0023] According to the above configuration, since the highly rigid protruding portion is not provided at a position corresponding to the thigh of the seated person, it is possible to suppress a decrease in the seating comfort due to the highly hard biomass urethane.

[0024] In this case, the invention may be a seat including a cushion material and a headrest cushion material for supporting the head of the seated person, wherein at least a portion of the headrest cushion material corresponding to the head of the seated person is formed of a material different from biomass urethane.

[0025] According to the structure, damage to the headrest can be suppressed. In detail, biomass urethane has high hardness, but is brittle and not impact-resistant. Therefore, if biomass urethane is used for a headrest, there is a concern that the headrest may be damaged by impact. Therefore, by forming the cushion material for the headrest with a material other than biomass urethane, damage to the headrest can be suppressed.

[0026] At this time, it can be: a seating seat, including a cushioning material and a seat heater arranged on the cushioning material, the seat heater having: a sheet-shaped heater substrate, arranged on the protruding portion of the cushioning material; a heater wire, installed on the heater substrate; and an insulating material, interposed between the protruding portion and the heater substrate and having insulating properties.

[0027] According to the above configuration, the heat from the heater wire can be less likely to be transferred to the biomass carbamate by the heat insulating material, so that the biomass carbamate can be prevented from being deteriorated by the heat from the heater wire.

[0028] At this time, the seat may include an air supply device provided on the cushion material, an air flow path for passing air from the air supply device is formed inside the cushion material, and a through hole for passing air from the air flow path is formed in the insulation material.

[0029] According to the above configuration, the wind from the air supply device can easily pass through the heat insulating material, so that the seated person can feel a good sense of warmth or coolness.

[0030] In this case, a passage hole for passing wind from the ventilation path may be formed in the heater base at a position facing the through hole of the heat insulating material.

[0031] According to the above configuration, the wind from the air supply device can easily pass through the heater base, thereby making it possible to provide a seated person with a better sense of warmth or coolness.

[0032] In addition, the problem is solved in the following manner: According to the vehicle seat of the present invention, it includes: a cushion material for supporting the seated person; and a seat frame for configuring the cushion material, and in the vehicle seat, the cushion material has: a base portion for supporting the seated person; a side portion, configured on the outer side of the base portion in the seat width direction; and an extension portion, extending from the side portion to the seated person side and supporting the seated person from the side, in the cushion material, the extension portion is entirely formed of biomass carbamate, and at least a portion of the base portion is formed of a material that is softer than the biomass carbamate.

[0033] According to the above structure, a vehicle seat can be realized which is environmentally friendly, improves the seating comfort and does not cause discomfort to the seated person.

[0034] Effects of the Invention

[0035] According to the present invention, a cushion material, a seat, and a vehicle seat can be realized which are environmentally friendly, improve the sitting comfort, and do not cause discomfort to the seated person.

[0036] In addition, according to the present invention, the rigidity of the extension portion and the side portion can be increased, the sitting comfort can be improved, and the support feeling of the cushion material can be improved.

[0037] Furthermore, according to the present invention, it is possible to suppress a decrease in seating comfort due to high-hardness biomass urethane.

[0038] In addition, according to the present invention, the sitting comfort can be improved, and the support feeling of the cushion material can be improved.

[0039] Furthermore, according to the present invention, damage to the headrest can be suppressed.

[0040] Furthermore, according to the present invention, it is possible to suppress the biomass carbamate from being deteriorated by the influence of heat from the heater line.

[0041] Furthermore, according to the present invention, the seated person can have a good sense of warmth or coolness.

[0042] Furthermore, according to the present invention, the seated person's sense of warmth or coolness can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] [ Figure 1 ] is a three-dimensional diagram of a vehicle seat according to the present embodiment.

[0044] [ Figure 2 ] is a top view of the cushioning material.

[0045] [ Figure 3 ]yes Figure 2 III-III cross-sectional view.

[0046] [ Figure 4 ] is a cross-sectional view of the cushioning material of variant example 1.

[0047] [ Figure 5 ] is a cross-sectional view of the cushioning material of variant example 2.

[0048] [ Figure 6 ] is a cross-sectional view of the cushioning material of variant example 3.

[0049] [ Figure 7 ] is a cross-sectional view of the cushioning material of variant example 4.

[0050] [ Figure 8 ] is a cross-sectional view of the cushioning material of variant example 5.

[0051] [ Fig. 9 ] is a top view of the cushioning material of variant example 6.

[0052] [ Fig.10 ]yes Fig. 9 XX cross-section diagram.

[0053] [ Fig.11 ] is a top view of the seat heater.

[0054] [ Fig.12 ]yes Fig.11 Section XII-XII of the diagram.

[0055] [ Fig.13 ] is a three-dimensional diagram of a vehicle seat of variant example 7.

[0056] [ Fig.14 ] is a three-dimensional diagram of a vehicle seat of variant example 8.

[0057] [ Fig.15 ] is a three-dimensional diagram of a vehicle seat of variant example 9.

[0058] [ Fig.16 ] is a three-dimensional diagram of a vehicle seat of variant example 10.

[0059] [ Fig.17 ] is a three-dimensional diagram of a vehicle seat of variant example 11. DETAILED DESCRIPTION

[0060] Below, refer to Figure 1 to Figure 3 Embodiments of the present invention will be described.

[0061] like Figure 1As shown, the seat of the present embodiment is, for example, a vehicle seat S installed in a vehicle. In addition, the vehicle seat S may be, for example, a seat installed in a ship or an airplane. In addition, the seat is not limited to the vehicle seat S, and may be a general chair, sofa, cushion, or other seat.

[0062] In the following description, the "front-rear direction" is the front-rear direction of the vehicle seat S, and is a direction that coincides with the traveling direction of the vehicle when traveling. In addition, the "seat width direction" is the width direction of the vehicle seat S, and is a direction that coincides with the left-right direction when viewed from a seated person sitting on the vehicle seat S. In addition, the "up-down direction" is the up-down direction of the vehicle seat S, and is a direction that coincides with the vertical direction when the vehicle travels on a horizontal plane.

[0063] <Overall structure of the seat>

[0064] like Figure 1 As shown, the vehicle seat S mainly includes a seat back 1 , a seat cushion 2 connected to a lower portion of the seat back 1 , and a headrest 3 connected to an upper portion of the seat back 1 .

[0065] The seat back 1 is a seat back supporting the back of a seated person from behind, and is composed of a cushion material 1a placed on a seat frame 4 (back frame 4a) as a framework and covered with a surface material 1b.

[0066] The seat cushion 2 is a seat portion that supports a seated person from below, and is configured by placing a cushion material 2a on a seat frame 4 (cushion frame 4b) as a framework and covering the cushion material 2a with a surface material 2b.

[0067] The headrest 3 supports the head of the seated person from behind, and is composed of a cushion material 3a placed on a headrest column (not shown) as a core material and covered with a surface material 3b.

[0068] Figure 2 The cushion pad body 10 is shown as the cushion material 2a constituting the seat cushion pad 2. The cushion material 1a constituting the seat back 1 has substantially the same structure as the cushion material 2a constituting the seat cushion pad 2, and thus description thereof is omitted.

[0069] The cushion body 10 is a cushion material 2a for supporting a seated person, and has a first cushion component 20 as a seat portion, a second cushion component 30 arranged around the first cushion component 20, a groove 40 formed on the surface 11 of the cushion body 10, and a snap-fit ​​portion 50 provided in the groove 40.

[0070] The cushion pad body 10 is covered with the surface material 2 b by being engaged with the surface material 2 b using the engaging portion 50 provided in the groove portion 40 .

[0071] The cushion body 10 is formed by, for example, insert molding to integrally form the first cushion member 20 , the second cushion member 30 , and the engaging portion 50 .

[0072] like Figure 2 , Figure 3 As shown, the first cushion member 20 has a base portion 21 provided at a central portion of the cushion body 10 .

[0073] The base 21 has a seat surface 22 for supporting the seated person from below. The seat surface 22 is a cushion member having thickness in the vertical direction and is formed in a substantially inverted U shape when viewed from above. The seat surface 22 refers to the surface 11 of the base 21 on the seated person's side other than the groove 40.

[0074] like Figure 2 , Figure 3 As shown, the second cushion member 30 includes a side portion 31 disposed outside the base portion 21 in the seat width direction, and an extension portion 32 extending from the side portion 31 toward the seat occupant side (upward) to support the seat occupant from the side.

[0075] The side portion 31 is a cushion member having substantially the same thickness as the base portion 21 in the up-down direction, and is formed in a substantially inverted U-shape in top view.

[0076] The extension portion 32 is a cushion member formed integrally with the side portion 31 by the same material as that of the side portion 31 , extends upward from the side portion 31 , and supports the seated person from the side.

[0077] like Figure 2 As shown, the extension portion 32 is formed to have a substantially U-shape when viewed from above, and surrounds the base portion 21. In detail, the extension portion 32 is configured to have a substantially inverted U-shape when viewed from above, and is formed at the base end portions 21a on both sides of the seat width direction of the base portion 21 and the rear end portion 21b of the base portion 21 to surround three sides of the base portion 21.

[0078] That is, the extension portion 32 is not formed at the front end of the base portion 21. Therefore, when the seated person sits on the base portion 21, since the extension portion 32 is not provided at the position corresponding to the thigh of the seated person, the extension portion 32 extending upward can suppress the reduction of the sitting comfort.

[0079] Here, the first cushion member 20 has a higher hardness than the second cushion member 30. Specifically, the first cushion member 20 is a soft cushion member formed of foamed urethane, etc. The second cushion member 30 is a hard cushion member formed of biomass urethane. That is, the cushion body 10 includes two cushion members formed of different materials and having different hardnesses.

[0080] The first cushion member 20 is, for example, a urethane foam other than biomass urethane formed by foaming using a urethane foam material (hereinafter referred to as non-biomass urethane). In other words, the non-biomass urethane is a cushion member formed of a material that is softer than the biomass urethane. In order to improve the seating feel, the non-biomass urethane preferably has a high rebound elastic modulus and a low hardness.

[0081] The entire base portion 21 is formed of non-biomass urethane. Therefore, by using non-biomass urethane, which is softer than biomass urethane, for the seat surface 22, the sitting comfort can be improved.

[0082] The second cushion member 30 is formed of, for example, biomass urethane. Here, the biomass urethane includes hard polyurethane foam having an increased biomass ratio.

[0083] The side portion 31 and the extension portion 32 are entirely formed of biomass urethane. Therefore, the side portion 31 and the extension portion 32 of the second cushion member 30 are harder than the base portion 21 of the first cushion member 20 and are less likely to bend, thereby preventing the first cushion member 20 of low hardness from being deformed by the load from the seated person.

[0084] Furthermore, the structure of the cushion pad main body 10 can also be applied to the cushion material 3a constituting the headrest 3. In this case, in the cushion material 3a for the headrest 3, at least the base portion 21 corresponding to the portion corresponding to the head of the seated person is formed of a material different from the extension portion 32 of the cushion material 3a. Specifically, in the cushion material 3a for the headrest 3, the base portion 21 is formed of non-biomass urethane, and the side portion 31 and the extension portion 32 are formed of biomass urethane.

[0085] Therefore, since the base portion 21 of the cushion material 3 a for the headrest 3 is formed of non-biomass urethane, the durability can be improved compared to biomass urethane which is brittle and not resistant to impact. Therefore, damage to the headrest 3 can be suppressed.

[0086] The groove 40 is a locking groove for locking the surface material 2b, and is formed on the surface 11 of the cushion body 10. Figure 2 , Figure 3As shown, the groove portion 40 is formed near the boundary portion B between the base portion 21 of the first cushion member 20 and the side portion 31 of the second cushion member 30 and has a substantially inverted U shape in top view.

[0087] Specifically, the groove 40 is formed near the boundary B on the seat surface 22 side of the cushion body 10 and is the base 21 of the first cushion member 20. In other words, the bottom surface 41 of the groove 40 is provided in the first cushion member 20.

[0088] In addition, in this embodiment, the groove 40 is described as an example of a locking groove for locking the surface material 2b, but the invention is not limited thereto. For example, the groove 40 may be a groove provided on the surface 11 of the cushion body 10 for arranging a heating element of a heater or a groove for allowing an airbag of an airbag device to pass through when the airbag is inflated.

[0089] The engaging portion 50 is an engaging member for engaging with the surface material 2 b and is formed as a clip having a substantially V-shaped cross section, for example.

[0090] The engaging portion 50 is made of resin, for example, polyacetal (POM) resin, polypropylene (PP) resin, polyamide (PA) resin, polycarbonate (PC) resin, etc. In addition, the engaging portion 50 can be formed of polyacetal (POM) resin having relatively high strength.

[0091] In addition, the engaging portion 50 may be formed in a U-shaped or C-shaped cross section. In addition, it is not limited to a clip, and may be an engaging member such as a metal wire. Furthermore, the engaging portion 50 is not limited to an engaging member, and may be an engaging hole for engaging the surface material 2b.

[0092] like Figure 2 As shown, a plurality of engagement portions 50 are provided at predetermined intervals inside the groove portion 40. The engagement portions 50 are integrally formed during foam molding of the cushion pad body 10, and thus are attached to the cushion pad body 10 in a state buried inside the groove portion 40.

[0093] When describing in detail, Figure 3 As shown, the engaging portion 50 is provided on the first cushion member 20 and is installed in a manner in which a portion of the engaging portion 50 is buried in the bottom surface 41 of the groove portion 40 .

[0094] like Figure 3As shown, the boundary portion B between the base portion 21 of the first cushion member 20 and the side portion 31 of the second cushion member 30 extends from the seat surface 22 provided on the surface 11 of the cushion body 10 (cushion material 2a) toward the back surface 12 on the opposite side to the seat surface 22 in a manner perpendicular to the seat surface 22 of the cushion body 10. In other words, the boundary surface between the base portion 21 of the first cushion member 20 and the side portion 31 of the second cushion member 30 is arranged to be perpendicular to the seat surface 22 from the boundary end portion B1 provided in the groove portion 40.

[0095] Therefore, the extension portion 32 and the side portion 31 of the second cushion pad member 30 formed of biomass urethane are not provided below the seat surface 22 , so that a decrease in the sitting comfort due to the high hardness of biomass urethane can be suppressed.

[0096] In addition, a boundary end portion B1 on the seat surface 22 side of the boundary portion B between the first cushion member 20 and the second cushion member 30 is provided in the groove portion 40 and is not exposed to the seat surface 22 .

[0097] In detail, the upper end portion of the boundary surface between the base portion 21 of the first cushion member 20 and the side portion 31 of the second cushion member 30, that is, the boundary end portion B1 is provided on the bottom surface 41 of the groove portion 40. Therefore, in the boundary portion B between the first cushion member 20 and the second cushion member 30, neither the end portion on the seated person side nor the end portion on the back surface 12 side opposite to the seated person side is provided on the seat surface 22.

[0098] As described above, even if the cushion body 10 is composed of the first cushion member 20 and the second cushion member 30 having different hardnesses, the boundary B between the first cushion member 20 and the second cushion member 30 does not cause discomfort to the seated person and the seating comfort can be improved.

[0099] In addition, the engaging portion 50 is provided on the side of the first cushion member 20 including non-biomass carbamate, which is softer than the second cushion member 30 including biomass carbamate. Therefore, when the load from the seated person is applied to the cushion body 10, the engaging portion 50 is easy to sink, which will not cause discomfort to the seated person and can further improve the seating comfort.

[0100] Furthermore, since the entire extension portion 32 is formed of biomass urethane, the boundary portion B between the first cushion member 20 and the second cushion member 30 is not exposed in the extension portion 32 , and thus the seating comfort can be further improved.

[0101] <Variation 1>

[0102] Next, based on Figure 4A modification 1 of the vehicle seat S will be described. Note that description of the contents that overlap with those of the vehicle seat S described above will be omitted.

[0103] In the vehicle seat S1 of Modification 1, the groove 40 is formed near the boundary B on the seating surface 22 side of the cushion body 10 and is the base 21 of the first cushion member 20. In other words, the bottom 41 of the groove 40 is provided in the first cushion member 20 and the second cushion member 30.

[0104] like Figure 4 As shown, the engaging portion 50 is attached so as to straddle the boundary portion B between the first cushion member 20 and the second cushion member 30 and to be partially buried in the bottom surface 41 of the groove portion 40 .

[0105] As described above, in the vehicle seat S1 of the first modification, the boundary end B1 on the side of the seat surface 22 of the boundary portion B between the first cushion member 20 and the second cushion member 30 is also provided in the groove portion 40 and is not exposed to the seat surface 22. Therefore, the boundary portion B between the first cushion member 20 and the second cushion member 30 does not give the seated person a sense of discomfort, and the seating comfort can be improved.

[0106] In addition, the engaging portion 50 is mounted on the bottom surface 41 of the groove portion 40 so as to straddle the boundary B between the first cushion member 20 and the second cushion member 30 , thereby improving the bonding strength between the first cushion member 20 and the second cushion member 30 having different materials or hardness.

[0107] <Variation 2>

[0108] Next, based on Figure 5 A modification 2 of the vehicle seat S will be described. Note that description of the contents that overlap with those of the vehicle seat S and the vehicle seat S1 will be omitted.

[0109] In the vehicle seat S2 of the second modification, the groove 40 is formed near the boundary B on the seat surface 22 side of the cushion main body 10 and is the side portion 31 of the second cushion member 30 . In other words, the bottom surface 41 of the groove 40 is provided in the second cushion member 30 .

[0110] like Figure 5 As shown, the engaging portion 50 is provided on the second cushion member 30 and is installed in a manner in which a portion of the engaging portion 50 is buried in the bottom surface 41 of the groove portion 40 .

[0111] As described above, in the vehicle seat S2 of the second modification, the boundary end B1 on the side of the seating surface 22 of the boundary portion B between the first cushion member 20 and the second cushion member 30 is also provided in the groove portion 40 and is not exposed to the seating surface 22. Therefore, the boundary portion B between the first cushion member 20 and the second cushion member 30 does not cause discomfort to the seated person and the seating comfort can be improved.

[0112] In addition, the engaging portion 50 is provided on the second cushion member 30 including biomass urethane which is harder than the first cushion member 20 including non-biomass urethane, so that the mounting strength of the engaging portion 50 to the cushion body 10 can be improved. Therefore, the mounting strength of the surface material 2b to the cushion material 2a can be improved.

[0113] <Variation 3>

[0114] Next, based on Figure 6 A modification 3 of the vehicle seat S will be described. Note that descriptions of the contents that overlap with those of the vehicle seat S, the vehicle seat S1, and the vehicle seat S2 will be omitted.

[0115] In the vehicle seat S3 of the third modification, the boundary portion B between the base portion 21 of the first cushion member 20 and the side portion 31 of the second cushion member 30 extends from the seat surface 22 provided on the surface 11 of the cushion main body 10 toward the back surface 12 on the opposite side to the seat surface 22 in such a manner that the side portion 31 is pressed under the seat surface 22. In other words, the boundary surface between the base portion 21 of the first cushion member 20 and the side portion 31 of the second cushion member 30 is arranged to be inclined inwardly in the seat width direction relative to the seat surface 22 from the boundary end portion B1 provided in the groove portion 40.

[0116] Therefore, the side portion 31 of the second cushion pad member 30 formed of biomass urethane is pushed under the base portion 21, so that the first cushion pad member 20 formed of low-hardness non-biomass urethane is suppressed from being deformed by the load from the seat occupant.

[0117] <Variation 4>

[0118] Next, based on Figure 7 A modification 4 of the vehicle seat S will be described. Note that description of the contents that overlap with those of the vehicle seat S and the vehicle seats S1 to S3 will be omitted.

[0119] In the vehicle seat S4 of the fourth modification, the first cushion member 20 includes a base portion 21 provided at the center of the cushion body portion 10 and a second side portion 23 disposed outside the base portion 21 in the seat width direction. That is, in the cushion body portion 10, the base portion 21 and the second side portion 23 are formed of non-biomass urethane, and the extension portion 32 is formed of biomass urethane.

[0120] The groove 40 is formed near the boundary B on the seat surface 22 side of the cushion body 10 and at the second side portion 23 of the first cushion member 20. The engaging portion 50 is mounted so as to straddle the boundary B between the first cushion member 20 and the second cushion member 30 and to be partially buried in the bottom surface 41 of the groove 40.

[0121] like Figure 7 As shown, the boundary portion B between the second side portion 23 of the first cushion member 20 and the extension portion 32 of the second cushion member 30 horizontally extends from the groove portion 40 provided on the surface 11 of the cushion main body 10 toward the outer side in the seat width direction. In other words, the boundary surface between the second side portion 23 of the first cushion member 20 and the extension portion 32 of the second cushion member 30 is arranged to be parallel to the seat surface 22 from the boundary end portion B1 provided in the groove portion 40.

[0122] Therefore, the volume of the extension portion 32 of the second cushion member 30 formed of biomass urethane can be reduced, and the seating comfort can be improved.

[0123] <Variant 5>

[0124] Next, based on Figure 8 A fifth modification of the vehicle seat S will be described. Note that descriptions of the contents that overlap with those of the vehicle seat S and the vehicle seats S1 to S4 will be omitted.

[0125] In the vehicle seat S5 of the fifth modification, the second cushion member 30 has only the side portion 31 disposed on the outer side of the base portion 21 in the seat width direction, and the protruding portion 32 is not provided.

[0126] As described above, in the vehicle seat S5 of the fifth modification, the boundary end B1 on the side of the seating surface 22 of the boundary portion B between the first cushion member 20 and the second cushion member 30 is also provided in the groove portion 40 and is not exposed to the seating surface 22. Therefore, the boundary portion B between the first cushion member 20 and the second cushion member 30 does not cause discomfort to the seated person and the seating comfort can be improved.

[0127] <Variant 6>

[0128] Next, based on Figures 9 to 12A modification 6 of the vehicle seat S will be described. Note that descriptions of the contents that overlap with those of the vehicle seat S and the vehicle seats S1 to S5 will be omitted.

[0129] The vehicle seat S6 of the sixth modification includes a cushion material 2a (cushion main body 10) of a seat cushion 2, a skin material 2b covering the cushion material 2a, a sheet-shaped seat heater 60 disposed between the cushion material 2a and the skin material 2b, and an air supply device 70 disposed below the cushion material 2a. In addition, the seat heater 60 and the air supply device 70 may also be disposed on the seat back 1 or the headrest 3.

[0130] A ventilation path 13 for passing wind from the air supply device 70 is formed inside the cushion body 10. The ventilation path 13 includes a first ventilation path 24 provided in the first cushion member 20 and connected to an air supply path 71 of the air supply device 70 described later, and a second ventilation path 33 provided in the second cushion member 30 and blowing air toward the extension portion 32.

[0131] The seat heater 60 is a planar heating element that heats the seat cushion 2 and is mounted inside the surface material 2b of the seat cushion 2 and provided on the cushion material 2a (cushion body 10). The seat heater 60 is connected to a power source and a control device via a wiring harness (not shown).

[0132] like Figures 9 to 12 As shown, the seat heater 60 includes a sheet-shaped heater base 61 , a heater wire 62 attached to the heater base 61 , and a heat insulating material 63 interposed between the extension portion 32 and the heater base 61 and having heat insulating properties.

[0133] The heater substrate 61 includes a stretchable cloth material and is the base portion of the seat heater 60. Fig. 9 , Fig.10 As shown, the heater base material 61 is provided on the mounting surface 32a of the extension portion 32 of the cushion pad main body 10. The mounting surface 32a is a surface of the extension portion 32 that is inclined toward the seat occupant side (inward in the seat width direction).

[0134] like Fig.12 As shown, a through hole 61a penetrating in the thickness direction of the heater base material 61 is formed in the heater base material 61. The through hole 61a is formed at a position facing a through hole 63a of the heat insulating material 63 described later.

[0135] like Fig. 9 , Fig.11 , Fig.12 As shown, the heater wire 62 is fixed to the heater base 61 by bonding. Alternatively, the heater wire 62 may be attached to the heater base 61 by sewing or the like.

[0136] The heater wire 62 extends in a meandering manner from the rear end portion of the heater base 61 toward the front side.

[0137] The heat insulating material 63 is a member having low thermal conductivity, such as glass wool or rock wool, and is unlikely to transfer heat from the heater wire 62 to the extension portion 32 of the cushion pad body 10. Fig. 9 , Fig.10 As shown, the heat insulating material 63 is mounted on the mounting surface 32 a of the extension portion 32 of the cushion pad body 10 .

[0138] like Fig.12 As shown, a through hole 63a for passing air from an air supply path 71 described later is formed in the heat insulating material 63. The through hole 63a penetrates the heat insulating material 63 in the thickness direction and is formed at a position facing the through hole 61a of the heater substrate 61.

[0139] As described above, by providing the heat insulating material 63 between the extension portion 32 of the second cushion member 30 and the heater base 61 , it is possible to suppress the second cushion member 30 formed of biomass urethane from being deteriorated by the heat from the heater wire 62 .

[0140] The air supply device 70 is a blower device that supplies air to a seated person sitting on the seat cushion 2, and is provided below the seat cushion 2. The seat heater 60 is connected to a power source and a control device via a wiring harness (not shown).

[0141] like Fig.10 As shown, the air supply device 70 has an air supply path 71 connected to the first air supply path 24 of the cushion main body 10. The air sent from the air supply device 70 passes through the first air supply path 24 and the second air supply path 33 via the air supply path 71 and is sent toward the seated person from the outlet 33a formed in the extension portion 32.

[0142] like Fig.10 , Fig.12 As shown, the air sent out from the air sending device 70 is sent toward the seated person from the air outlet 33 a formed in the extension portion 32 through the passage hole 61 a and the through hole 63 a of the seat heater 60 .

[0143] As described above, by providing the through hole 61a and the through hole 63a in the heater substrate 61 and the insulating material 63 respectively, the wind from the air supply device 70 can easily pass through the heater substrate 61 and the insulating material 63, so that the seated person can feel the warmth or coolness well.

[0144] <Variant 7>

[0145] Next, based on Fig.13A modification 7 of the vehicle seat S will be described. Note that description of the contents that overlap with those of the vehicle seat S and the vehicle seats S1 to S6 will be omitted.

[0146] like Fig.13 As shown, the vehicle seat S7 of the modification 7 mainly includes a seat back 1, a seat cushion 2 connected to the lower part of the seat back 1, a headrest 3 connected to the upper part of the seat back 1, and a footrest 5 connected to the front part of the seat cushion 2. The footrest 5 is a member for supporting the feet of the seated person from below.

[0147] In the seat back 1 , the second cushion member 30 containing biomass urethane is used in the cushion main body portion 10 corresponding to the lateral portion of the seat back 1 , that is, the back bulging portion 1 c .

[0148] In the seat cushion pad 2 , the second cushion member 30 containing biomass urethane is used for the cushion pad main body portion 10 corresponding to the bulging portion 2 c which is a side portion of the seat cushion pad 2 .

[0149] Furthermore, the cushion main body 10 corresponding to the portion of the seat back 1 excluding the back bulging portion 1 c , the portion of the seat cushion 2 excluding the bulging portion 2 c , the headrest 3 , and the footrest 5 is formed of non-biomass urethane.

[0150] As described above, the second cushion member 30 formed of biomass urethane is arranged away from the seat portion of the seated person, and thus the seating comfort of the vehicle seat S7 can be improved.

[0151] <Variant 8>

[0152] Next, based on Fig.14 A modification 8 of the vehicle seat S will be described. Note that descriptions of the contents that overlap with those of the vehicle seat S and the vehicle seats S1 to S7 will be omitted.

[0153] like Fig.14 As shown, the vehicle seat S8 of the eighth modification mainly includes a seat back 1 , a seat cushion 2 connected to a lower portion of the seat back 1 , and a headrest 3 connected to an upper portion of the seat back 1 .

[0154] In the seat back 1 , the second cushion member 30 containing biomass urethane is used in the cushion main body portion 10 corresponding to the lateral portion of the seat back 1 , that is, the back bulging portion 1 c .

[0155] In the seat back 1 , the second cushion member 30 containing biomass urethane is used in the cushion main body 10 corresponding to the seat back upper portion 1 d which is the upper center portion of the seat back 1 .

[0156] In the seat cushion pad 2 , the second cushion member 30 containing biomass urethane is used in the cushion pad main body portion 10 corresponding to the bulging portion 2 c which is a side portion of the seat cushion pad 2 .

[0157] In the seat cushion pad 2 , the second cushion member 30 containing biomass urethane is used in the cushion pad main body 10 corresponding to the seat front end portion 2 d which is the front center portion of the seat cushion pad 2 .

[0158] Furthermore, the cushion pad main body 10 corresponding to the portion of the seat back 1 excluding the back bulge 1c and the seat back upper portion 1d, the portion of the seat cushion 2 excluding the bulge 2c and the seat front end portion 2d, and the headrest 3 is formed of non-biomass urethane.

[0159] As described above, the second cushion member 30 formed of biomass urethane is arranged away from the seat portion of the seated person, and thus the seating comfort of the vehicle seat S8 can be improved.

[0160] <Variant 9>

[0161] Next, based on Fig.15 A modification 9 of the vehicle seat S will be described. Note that descriptions of the contents that overlap with those of the vehicle seat S and the vehicle seats S1 to S8 will be omitted.

[0162] like Fig.15 As shown, the vehicle seat S9 of the ninth modification mainly includes a seat back 1 , a seat cushion 2 connected to a lower portion of the seat back 1 , and a headrest 3 connected to an upper portion of the seat back 1 .

[0163] In the seat cushion pad 2 , the second cushion member 30 containing biomass urethane is used in the cushion pad main body portion 10 corresponding to the bulging portion 2 c which is a side portion of the seat cushion pad 2 .

[0164] In the seat cushion pad 2 , the second cushion member 30 containing biomass urethane is used in the cushion pad main body portion 10 corresponding to the rear center portion of the seat cushion pad 2 , that is, the seat rear end portion 2 e .

[0165] Furthermore, the cushion pad main body portion 10 corresponding to the seat back 1 , the portion of the seat cushion pad 2 excluding the bulging portion 2 c and the seat rear end portion 2 e , and the headrest 3 is formed of non-biomass urethane.

[0166] As described above, the second cushion member 30 formed of biomass urethane is arranged away from the seat portion of the seated person, and thus the seating comfort of the vehicle seat S9 can be improved.

[0167] <Variation 10>

[0168] Next, based on Fig.16 A modification 10 of the vehicle seat S will be described. Note that descriptions of the contents that overlap with those of the vehicle seat S and the vehicle seats S1 to S9 will be omitted.

[0169] like Fig.16 As shown, the vehicle seat S10 of the modification 10 mainly includes a seat back 1 , a seat cushion 2 connected to a lower portion of the seat back 1 , and a headrest 3 connected to an upper portion of the seat back 1 .

[0170] In the headrest 3 , the second cushion member 30 containing biomass urethane is used in the cushion main body portion 10 corresponding to the side portion 3 c of the headrest 3 .

[0171] Furthermore, the cushion pad main body portion 10 corresponding to the seat back 1 , the seat cushion pad 2 , and the headrest 3 excluding the side portions 3 c is formed of non-biomass urethane.

[0172] As described above, the second cushion member 30 formed of biomass urethane is arranged away from the seat portion of the seated person, and thus the seating comfort of the vehicle seat S10 can be improved.

[0173] <Variation 11>

[0174] Next, based on Fig.17 A modification 11 of the vehicle seat S will be described. Note that description of the contents that overlap with those of the vehicle seat S and the vehicle seats S1 to S10 described above will be omitted.

[0175] like Fig.17 As shown, the vehicle seat S11 of Modification 11 mainly includes a seat back 1 , a seat cushion 2 connected to a lower portion of the seat back 1 , and a headrest 3 connected to an upper portion of the seat back 1 .

[0176] In the seat back 1 , the second cushion member 30 containing biomass urethane is used in the cushion pad main body 10 corresponding to the center portion of the seat back 1 , that is, the decorated backrest decorative portion 1 e .

[0177] In the seat cushion pad 2 , the second cushion member 30 containing biomass urethane is used in the cushion pad main body portion 10 corresponding to the cushion pad decorative portion 2 f which is a central portion of the seat cushion pad 2 and is decorated.

[0178] Furthermore, the cushion pad main body 10 corresponding to a portion of the seat back 1 excluding the backrest trim 1 e , a portion of the seat cushion pad 2 excluding the cushion pad trim 2 f , and the headrest 3 is formed of non-biomass urethane.

[0179] As described above, the second cushion member 30 formed of biomass urethane is arranged away from the seat portion of the seated person, and thus the seating comfort of the vehicle seat S10 can be improved.

[0180] <Note>

[0181] The problem is solved as follows: According to the cushioning material of the present invention, it is a cushioning material for a seated chair and used to support a seated person, the cushioning material has a first cushioning component and a second cushioning component, the second cushioning component is arranged adjacent to the first cushioning component and has a higher hardness than the first cushioning component, a groove portion recessed toward the back side of the cushioning material is formed on a seating surface arranged on the surface of the cushioning material, and an end portion located on the seating surface side of a boundary portion between the first cushioning component and the second cushioning component is arranged in the groove portion and is arranged in a manner not to be exposed to the seating surface.

[0182] According to the above structure, it is possible to realize a cushion material which is environmentally friendly, improves the sitting comfort and does not cause discomfort to the seated person.

[0183] Specifically, by using environmentally friendly biomass urethane for the extension portion, an environmentally friendly cushion material can be realized, and by using urethane foam, which is softer than biomass urethane, for the seat surface, the seating comfort can be improved.

[0184] Furthermore, since the boundary portion of the cushion pad member is not exposed to the seat surface, the seated person does not feel uncomfortable and the sitting comfort can be improved.

[0185] At this time, it can be: a seat chair, which includes a cushion material, a skin material covering the cushion material, and a clamping part arranged on the cushion material and used to clamp the skin material to the cushion material, and the clamping part is installed on the bottom surface of the groove part of the cushion material.

[0186] According to the above configuration, the concave portion of the engagement groove prevents the boundary portion of the cushion pad member from being exposed to the seat surface, so that the seated person does not feel uncomfortable with a simple configuration and the seating comfort can be improved.

[0187] In this case, the second cushion member may be formed of biomass urethane, the bottom surface of the groove portion may be disposed on the first cushion member, and the engaging portion may be disposed on the first cushion member and disposed on the bottom surface of the groove portion.

[0188] According to the above structure, a snap-fitting portion is provided on the side of the first cushion member including non-biomass carbamate which is softer than the second cushion member including biomass carbamate. Therefore, when a load from a seated person is applied to the cushion material, the snap-fitting portion easily sinks, which does not cause discomfort to the seated person and can further improve the seating comfort.

[0189] At this time, the second cushion member may be formed of biomass urethane, the bottom surface of the groove portion may be provided on the first cushion member and the second cushion member, and the engaging portion may be provided on the bottom surface of the groove portion in a manner spanning the boundary portion between the first cushion member and the second cushion member.

[0190] According to the above configuration, the engaging portion is mounted on the bottom surface of the groove portion so as to straddle the first cushion member and the second cushion member, thereby improving the bonding strength between the first cushion member and the second cushion member having different materials or hardnesses.

[0191] In this case, the second cushion member may be formed of biomass urethane, the bottom surface of the groove portion may be provided on the second cushion member, and the engaging portion may be provided on the second cushion member and on the bottom surface of the groove portion.

[0192] According to the above configuration, since the engaging portion is provided on the second cushion member including biomass urethane which is harder than the first cushion member including non-biomass urethane, the attachment strength of the engaging portion to the cushion material can be increased.

[0193] In addition, the problem is solved by the following method: According to the vehicle seat of the present invention, it includes: a cushion material for supporting a seated person; and a seat frame for configuring the cushion material, and in the vehicle seat, the cushion material has a first cushion component and a second cushion component that is harder than the first cushion component, a groove is formed on the seating surface of the cushion material, and an end portion of the boundary portion between the first cushion component and the second cushion component on the seating surface side is arranged in the groove and is not exposed to the seating surface.

[0194] According to the above structure, a vehicle seat can be realized which is environmentally friendly, improves the seating comfort and does not cause discomfort to the seated person.

[0195] In the embodiment, as a specific example, the vehicle seat used in the automobile is described, but there is no particular limitation. In addition to two-wheeled seats for two-wheeled vehicles, vehicle seats such as trams or buses, and seats for transportation vehicles such as airplanes or ships, various seats such as office chairs for work, wheelchairs, and children's seats in shopping carts can also be used.

[0196] In the present embodiment, the vehicle seat of the present invention is mainly described.

[0197] However, the above-described embodiment is only an example for easy understanding of the present invention and does not limit the present invention. Of course, the present invention can be changed and improved without departing from the gist thereof, and its equivalents are included in the present invention.

[0198] Explanation of symbols

[0199] S, S1~S11: Vehicle seats (seating seats)

[0200] 1: Seat back

[0201] 1a: Cushioning material

[0202] 1b: Surface material

[0203] 1c: Backrest bulge

[0204] 1d: Upper backrest

[0205] 1e: Backrest decoration

[0206] 2: Seat cushion

[0207] 2a: Cushioning material

[0208] 2b: Surface material

[0209] 2c: bulge

[0210] 2d: Front part of the seat

[0211] 2e: rear end of seat

[0212] 2f: Cushion decoration part

[0213] 3: Headrest

[0214] 3a: Cushion material (cushion material for headrest)

[0215] 3b: Surface material

[0216] 3c: Lateral part

[0217] 4: Seat frame

[0218] 5: Foot pedal

[0219] 10: Buffer pad body

[0220] 11: Surface

[0221] 12: Back

[0222] 13: Ventilation path

[0223] 20: First cushion member

[0224] 21: Base

[0225] 21a: Base end (both ends)

[0226] 21b: rear end

[0227] 22: Seating surface

[0228] 23: Second side

[0229] 24: First ventilation path

[0230] 30: Second cushion member

[0231] 31: Side

[0232] 32: Extension

[0233] 32a: Mounting surface

[0234] 33: Second ventilation path

[0235] 33a: Blowing outlet

[0236] 40: Groove

[0237] 41: Bottom

[0238] 50: snap-fit ​​part

[0239] 60: Seat heater

[0240] 61: Heater substrate

[0241] 61a: Through hole

[0242] 62: Heater line

[0243] 63: Insulation material

[0244] 63a: Through hole

[0245] 70: Air supply device

[0246] 71: Air supply path

[0247] B: Boundary

[0248] B1: Boundary end (end on the seating surface side)

Claims

1. A cushion material for a seat and used to support a seated person, wherein the cushion material is characterized by having: A base portion, supporting the seated person; A side portion, arranged on the outer side of the base portion in the seat width direction; and The extension portion extends from the side portion toward the seated person and supports the seated person from the side. In the cushion member, the entire extension portion is formed of biomass urethane, and at least a portion of the base portion is formed of a material softer than biomass urethane.

2. The cushion material according to claim 1, characterized in that In the cushion material, the extension portion and the side portion are entirely formed of biomass urethane.

3. The cushion material according to claim 2, characterized in that: The side portion is arranged adjacent to the base portion, The boundary portion between the base portion and the side portion extends from the seat surface of the cushion material toward a back surface opposite to the seat surface, and extends perpendicularly to the seat surface of the cushion material.

4. The cushion material according to claim 1, characterized in that The cushion material is used for a seat cushion of the seat. The base supports the seated person from below. The extension portion is formed to have a substantially U-shape in a top view and surrounds the base portion.

5. The cushion material according to claim 4, characterized in that: The extending portion of the cushion material is formed at both ends of the base portion in the seat width direction and at a rear end of the base portion.

6. A seat, comprising the cushion material according to claim 1 and a cushion material for a headrest for supporting the head of the seated person, wherein the seat is characterized in that: In the headrest cushion material, at least a portion corresponding to the seated person's head is formed of a material different from biomass urethane.

7. A seat, comprising the cushion material according to claim 1 and a seat heater provided on the cushion material, wherein the seat is characterized in that: The seat heater includes: a sheet-shaped heater base material provided on the extended portion of the cushion material; a heater wire attached to the heater base material; and a heat insulating material interposed between the extended portion and the heater base material and having heat insulating properties.

8. The seating chair according to claim 7, characterized in that: The seat comprises an air supply device provided on the cushion material, A ventilation path is formed inside the cushion material for allowing air from the air supply device to pass through. The heat insulating material has a through hole formed therein for allowing the wind from the ventilation path to pass therethrough.

9. The seating chair according to claim 8, characterized in that: In the heater base, a passage hole through which wind from the ventilation path passes is formed at a position facing the through hole of the heat insulating material.

10. A seat for a vehicle, comprising: Cushioning material to support the seated person; and A seat frame is provided for arranging the cushion material, and the vehicle seat is characterized in that: The lining material has: A base portion, supporting the seated person; A side portion, arranged on the outer side of the base portion in the seat width direction; and The extension portion extends from the side portion toward the seated person and supports the seated person from the side. In the cushion member, the entire extension portion is formed of biomass urethane, and at least a portion of the base portion is formed of a material softer than the biomass urethane.

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