Seat for mobile body

Abstract

Provided is a seat for a mobile body with which ease of maintenance, assembly and customization can be improved while achieving a reduction in weight.　A seat (S) for a mobile body comprises: a cushion support body (10) comprising a first foam body; a cushion pad material (20) stacked on the cushion support body (10) and comprising a second foam body that is softer than the first foam body; and a cushion skin material (30) covering the cushion pad material (20). The cushion skin material (30) covers an obverse surface (20a) of the cushion pad material (20) and extends to a reverse surface (20b) of the cushion pad material (20), and the cushion pad material (20) is detachably engaged with the cushion support body (10).

Description

Seat for a moving body

[0001] The present invention relates to a seat for a moving body, and particularly to a seat for a moving body including a support and a padding material.

[0002] Conventionally, there is known a seat for a moving body, such as an aircraft or a vehicle, which supports a seated person by a cushion made of a foam. For example, in the seat for a moving body described in Patent Document 1, a seat cushion detachable from a support structure of an aircraft is disclosed. The seat cushion is configured by laminating an upper layer (corresponding to the padding material) made of a honeycomb core panel on a base layer (corresponding to the support) made of a foam material, and covering the base layer and the upper layer with a skin material.

[0003] Also, for example, in the vehicle seat described in Patent Document 2, a seat cushion detachable from a vehicle body floor is disclosed. The seat cushion is configured by laminating a first pad member (corresponding to the padding material) made of a foamed resin on a second pad member (corresponding to the support) made of foamed propylene, and covering the second pad member and the first pad member with a skin.

[0004] Japanese Patent Publication No. 2020 - 522439, Japanese Unexamined Patent Application Publication No. 2024 - 079538

[0005] In recent years, eVTOL (Electric Vertical Take - Off and Landing aircraft) has received attention, and the development of eVTOLs that allow seated persons to board has also been progressing. In a moving body such as an eVTOL, the weight ratio of the seated person to the airframe tends to be high. Therefore, from the perspective of aircraft control, a seat for a moving body that supports a seated person is required to be as lightweight as possible. Also, as a moving body, a home - built aircraft, which is an assembled aircraft, is known. Since a home - built aircraft is self - made, the maintainability, assembly, and customizability of the seat for a moving body are required.

[0006] However, in mobile seats such as those described in Patent Documents 1 and 2, the entire seat cushion is covered with a surface material while the support and pad material are fixed together, making it difficult to remove the pad material from the support. As a result, there was a risk that the maintainability, assembly, and customizability of the mobile seat would be reduced.

[0007] This invention has been made in view of the above-mentioned problems, and the object of this invention is to provide a seat for a mobile vehicle that can be made lighter while improving maintainability, ease of assembly, and customizability.

[0008] The aforementioned problem is solved by providing a sheet for a mobile body, comprising a support made of a first foam, a pad material made of a second foam that is softer than the first foam and laminated on the support, and a surface material that covers the pad material, wherein the surface material covers the surface of the pad material and extends to the back surface of the pad material, and the pad material is detachably engaged with the support.

[0009] With the above configuration, a pad material made of a second foam can be detachably attached to a support made of a first foam, thereby reducing the overall weight of the mobile seat while improving maintainability, ease of assembly, and customizability. Therefore, it is possible to reduce the weight of the mobile seat while improving maintainability, ease of assembly, and customizability.

[0010] In this configuration, the pad material has an engaging member that detachably engages with the support and a locking member that detachably locks with the surface material, and the engaging member and the locking member are provided on the back surface of the pad material, and when viewed from the stacking direction in which the pad material is stacked on the support, the engaging member is preferably positioned inside the locking member. With the above configuration, since the engaging member is positioned inside, it is possible to prevent the engaging member from coming into contact with the worker's hand when the worker grips the pad material.

[0011] In this configuration, the pad material has an engaging member that detachably engages with the support and a locking member that detachably locks with the surface material, and the engaging member and the locking member are provided on the back surface of the pad material, and when viewed from the stacking direction in which the pad material is stacked on the support, the locking member is preferably positioned closer to the contour of the pad material than the engaging member. With the above configuration, since the locking member is positioned close to the contour, it is possible to prevent the engaging member from coming into contact with the worker's hand when the worker grips the pad material.

[0012] In this configuration, the support is attached to the wall or floor surface of the mobile body, and a portion of the pad material is detachably attached to the wall or floor surface. With this configuration, the pad material is detachably attached to the mobile body, thereby increasing the support capacity of the pad material while further improving maintainability, ease of assembly, and customizability.

[0013] In this configuration, the pad material includes an engaging member that detachably engages with the support, a locking member that detachably locks with the surface material, and a mounting member that detachably attaches to the wall or floor surface. The engaging member, the locking member, and the mounting member are provided on the back surface of the pad material, and when viewed from the stacking direction in which the pad material is stacked on the support, the mounting member is preferably positioned inside the locking member. With this configuration, since the mounting member is positioned inside, it is possible to prevent the mounting member from coming into contact with the worker's hand when the worker grips the pad material.

[0014] In this configuration, the pad material has an engaging member that detachably engages with the support and a locking member that detachably locks with the surface material, the engaging member and the locking member are provided on the back surface of the pad material, the locking member is arranged along the contour of the pad material, and when viewed from the stacking direction in which the pad material is stacked on the support, the locking member is provided in the straight portion where the contour of the pad material extends in a straight line, and it is preferable that only one locking member is provided corresponding to the straight portion. With the above configuration, since only one locking member is provided corresponding to the straight portion, the occurrence of wrinkles in the surface material can be suppressed. In addition, since the surface material is arranged flat, the unevenness of the surface material can be suppressed.

[0015] In this configuration, the pad material has an engaging member that detachably engages with the support and a locking member that detachably locks with the surface material, the engaging member and the locking member are provided on the back surface of the pad material, and a recessed step is formed on the back surface of the pad material in the stacking direction for stacking the pad material on the support, and the locking member is preferably positioned on the step. With the above configuration, the locking member is positioned on the step, so the back surface of the pad material becomes flat. Therefore, when the pad material and the support are stacked, rattling of the pad material can be suppressed.

[0016] In this case, a second stepped portion is formed on the back surface of the pad material, which is recessed in the stacking direction more than the stepped portion, and the locking member is preferably positioned on the second stepped portion. With the above configuration, even if there are multiple overlapping portions of the surface material, these portions are positioned on the more deeply recessed second stepped portion, so the back surface of the pad material becomes flat. Therefore, when the pad material and the support are stacked, rattling of the pad material can be suppressed.

[0017] In this configuration, a suspension groove for suspending the surface material is formed on the surface of the pad material, and the pad material has an engaging member that detachably engages with the support, a locking member that detachably locks with the surface material, and a suspension member for suspending the surface material, wherein the suspension member is provided inside the suspension groove, and the locking member is provided only on the back surface of the pad material. With this configuration, since no locking member is provided on the surface of the pad material, it is possible to suppress the occurrence of wrinkles in the surface material on the surface side of the pad material. In addition, since the surface material is arranged flat, the unevenness of the surface material can be suppressed.

[0018] The aforementioned problem is solved by providing a sheet for a mobile vehicle, comprising a support made of a first foam, and a pad material made of a second foam that is softer than the first foam and laminated on the support, wherein the support is placed on the wall or floor surface of the mobile vehicle, a part of the pad material is detachably attached to the wall or floor surface, and the pad material is detachably engaged with the support. With the above configuration, the pad material made of the second foam can be detachably attached to the support made of the first foam, thereby reducing the overall weight of the sheet for the mobile vehicle while improving maintainability, ease of assembly, and customizability. Therefore, the maintainability, ease of assembly, and customizability of the sheet for the mobile vehicle can be improved.

[0019] According to the present invention, it is possible to improve maintainability, assembly, and customizability while reducing weight. Furthermore, according to the present invention, it is possible to suppress contact between the engaging member and the worker's hand when the worker grips the pad material. Furthermore, according to the present invention, it is possible to further improve maintainability, assembly, and customizability while increasing the support force of the pad material. Furthermore, according to the present invention, it is possible to suppress contact between the mounting member and the worker's hand when the worker grips the pad material. Furthermore, according to the present invention, it is possible to suppress the occurrence of wrinkles in the surface material. Furthermore, since the surface material is arranged flat, the unevenness of the surface material can be suppressed. Furthermore, according to the present invention, the back surface of the pad material becomes flat. Therefore, when the pad material and the support are laminated, rattling of the pad material can be suppressed. Furthermore, according to the present invention, it is possible to suppress the occurrence of wrinkles in the surface material on the surface side of the pad material. Furthermore, since the surface material is arranged flat, the unevenness of the surface material can be suppressed.

[0020] This is a perspective view of the mobile seat of the first embodiment. This is a side view of the mobile seat, showing it in a state where it is placed on a mobile body. This is a rear view of the mobile seat. This is a perspective view of the mobile seat, showing it with the surface material removed. This is an exploded perspective view of the support and pad material. This is a side view of the support. This is a bottom view of the support. This is a top view of the support. This is a cross-sectional view taken along IX-IX in Figure 7. This is a cross-sectional view taken along X-X in Figure 7. This is a side view of the pad material. This is a bottom view of the pad material. This is a top view of the pad material. This is a bottom view of the pad material, showing it with the surface material attached. This is an explanatory diagram of the suspension structure. This is a rear view of the support. This is a front view of the support. This is a rear view of the pad material. This is a front view of the pad material. This is a partial enlarged view of the pad material. This is a rear view of the pad material, showing it with the surface material attached. This is a rear view of the support of the second embodiment. This is a cross-sectional view taken along XXIII-XXIII in Figure 22. This is a side view of the mobile seat of the third embodiment. This is a side view of the mobile seat of the fourth embodiment. This is a side view of the mobile sheet according to the fifth embodiment. This is a side view of the mobile sheet according to the sixth embodiment. This is a perspective view of the support for the mobile sheet according to the seventh embodiment.

[0021] Embodiments of the present invention will be described below with reference to Figures 1 to 28. In the following description, "front-rear direction" refers to the front-rear direction of the seat for the mobile vehicle, which coincides with the direction of travel when the mobile vehicle is flying or traveling. "Seat width direction" refers to the width direction of the seat for the mobile vehicle, which coincides with the left-right direction as viewed from a person seated on the seat for the mobile vehicle. "Up-down direction" refers to the up-down direction of the seat for the mobile vehicle, which coincides with the vertical direction when the mobile vehicle is flying or traveling on a horizontal plane.

[0022] <First Embodiment> The mobile seat S of the first embodiment will be described with reference to Figures 1 to 21. As shown in Figure 1, the mobile seat S is a seat that is placed inside a mobile body such as an aircraft and supports a seated person. The mobile seat S may be placed in a mobile body other than an aircraft, for example, in a vehicle. As shown in Figure 2, the mobile seat S can be attached directly to the floor surface F or wall surface W of the mobile body without using, for example, a steel seat frame. Since the mobile seat S is mainly composed of foam, it can be made lighter compared to the case in which a steel seat frame is used.

[0023] As shown in Figure 1, the mobile seat S comprises a seat cushion 1 that supports the seated person's buttocks and a seat back 2 that supports the seated person's back and head. As shown in Figure 2, the mobile seat S has separate seat cushion 1 and seat back 2, and the seat cushion 1 and seat back 2 are attached to the floor surface F and wall surface W (for example, made of aluminum) of the mobile body, respectively. Specifically, the seat cushion 1 is detachably attached to the floor surface F. The seat back 2 is detachably attached to the rear wall surface. Note that the seat cushion 1 and seat back 2 are not limited to separate shapes, but may be integrated shapes. Also, the attachment positions of the seat cushion 1 and seat back 2 to the mobile body are not limited to the floor surface F and rear wall surface, but may also be the ceiling surface or wall surface W such as the inner surface.

[0024] As shown in Figure 1, the seat cushion 1 is a seating portion for supporting the buttocks of a sitter from below, and comprises a cushion support 10 made of a first foam, a cushion pad material 20 made of a second foam that is softer than the first foam and laminated on the cushion support 10, and a cushion surface material 30 covering the cushion pad material 20. As shown in Figure 2, the cushion support 10 is detachably attached to the floor surface F of the mobile body, for example by metal pins. The cushion pad material 20 is detachably engaged with the cushion support 10, for example by hook-and-loop fasteners (loop portion and hook portion). The cushion surface material 30 is detachably locked to the cushion pad material 20, for example by hook-and-loop fasteners. Note that a part of the cushion pad material 20 may be detachably attached to the floor surface F.

[0025] As shown in Figure 3, the bottom surface of the seat cushion 1 is provided with a member for detachably attaching it to the floor surface F of the mobile body. Specifically, the lower surface 10b of the cushion support 10 is provided with a floor connection member 13, which will be described later. The cushion support 10 is detachably attached to the floor surface F of the mobile body by the floor connection member 13. Although the cushion support 10 is detachably attached directly to the floor surface F of the mobile body, it may also be attached via an attachment. In this case, the attachment should preferably be made of a relatively lightweight material.

[0026] The cushion surface material 30 covers the surface 20a of the cushion pad material 20 and extends to the back surface 20b of the cushion pad material 20. The end of the cushion surface material 30 is engaged with the back surface 20b of the cushion pad material 20, and the cushion pad material 20 is laminated onto the cushion support 10 from above. In other words, in the lamination direction (specifically the vertical direction) in which the cushion pad material 20 is laminated onto the cushion support 10, the cushion surface material 30 is positioned between the cushion support 10 and the cushion pad material 20. This makes it possible to easily attach and detach the cushion pad material 20 from the cushion support 10 while the cushion surface material 30 is attached.

[0027] Thus, since the seat cushion 1 is mainly composed of a cushion support 10 made of a first foam and a cushion pad material 20 made of a second foam, the overall weight of the seat for the mobile vehicle can be reduced. In particular, since the cushion support 10 of the seat cushion 1 is placed directly on the floor surface F of the mobile vehicle without the use of metal members or the like, the seat can be made even lighter compared to when a steel seat frame is used. In addition, since the cushion pad material 20 can be detachably attached to the cushion support 10, maintainability, assembly, and customizability can be improved.

[0028] The seat back 2 is a backrest and headrest portion for supporting the back and head of the seated person from the rear, and comprises a back support 40 made of a first foam, a back pad material 50 made of a second foam that is softer than the first foam and laminated on the back support 40, and a back surface material 60 covering the back pad material 50. As shown in Figure 2, the back support 40 is detachably attached to the wall surface W of the moving body, for example by metal pins. The back pad material 50 is detachably attached to the back support 40 and the wall surface W, for example by hook-and-loop fasteners. The back surface material 60 is detachably attached to the back pad material 50, for example by hook-and-loop fasteners.

[0029] As shown in Figure 3, the back of the seat back 2 is provided with a member for detachably attaching it to the wall surface W of the mobile body. Specifically, the rear surface 40b of the back support 40 is provided with a wall connection member 43, which will be described later. Also, the back surface 50b of the back pad material 50 is provided with an attachment member 55, which will be described later. The back support 40 is detachably attached to the wall surface W of the mobile body by the wall connection member 43. A part of the back pad material 50 is detachably attached to the wall surface W of the mobile body by the attachment member 55. The back support 40 is detachably attached directly to the floor surface F of the mobile body, but it may also be attached via an attachment. In this case, the attachment should preferably be made of a relatively lightweight material.

[0030] As shown in Figure 2, the back surface material 60 covers the surface 50a of the back pad material 50 and extends to the back surface 50b of the back pad material 50. The end of the back surface material 60 is engaged with the back surface 50b of the back pad material 50, and the back pad material 50 is laminated onto the back support 40 from the front. In other words, in the lamination direction (specifically the front-to-back direction) in which the back pad material 50 is laminated onto the back support 40, the back surface material 60 is positioned between the back support 40 and the back pad material 50. This makes it possible to easily attach and detach the back pad material 50 from the back support 40 while the back surface material 60 is attached.

[0031] Thus, since the seat back 2 is mainly composed of a back support 40 made of a first foam and a back pad material 50 made of a second foam, the overall weight of the seat for the mobile vehicle can be reduced. In particular, since the back support 40 of the seat back 2 is directly placed on the wall surface W of the mobile vehicle without the use of metal members or the like, the seat can be made even lighter compared to when a steel seat frame is used. In addition, since the back pad material 50 can be detachably attached to the back support 40, maintainability, assembly, and customization can be improved. In particular, since the back pad material 50 can be detachably attached to both the back support 40 and the wall surface W of the mobile vehicle, the back pad material 50 can be easily attached to and detached from the back support 40 and the wall surface W of the mobile vehicle.

[0032] <<Detailed Configuration of the Seat Cushion>> Here, we will explain each component of the seat cushion 1. Figure 4 shows the state after the cushion surface material 30 has been removed from the cushion pad material 20. The seat cushion 1 has a two-layer structure in which a cushion support 10 made of a first foam and a cushion pad material 20 made of a second foam are laminated together. Note that it may be three or more layers, not just two, and the hardness of each layer can be set as appropriate. As shown in Figure 5, the cushion pad material 20 can be removed from the cushion support 10.

[0033] The cushion support 10 is a rigid foam made, for example, from expanded polypropylene (EPP), and supports the buttocks and thighs of the seated person. As shown in Figure 2, the upper surface 10a of the cushion support 10 is a laminated surface for laminating the cushion pad material 20. The lower surface 10b of the cushion support 10 is a mounting surface for attaching it to the floor surface F of the mobile body. The lower surface 10b is a flat surface and is attached to a flat floor surface F. As shown in Figure 6, the cushion support 10 has a cushion support body 11 that supports the seated person from below, and a cushion engaging member 12 for engaging the cushion pad material 20. Furthermore, as shown in Figures 2 and 7, the lower surface 10b of the cushion support 10 is provided with a floor connecting member 13 for attachment to a floor connecting member Fa provided on the floor surface F of the mobile body, and a groove 14 that is elongated in the front-rear direction. The cushion engaging member 12 and the floor connecting member 13 are fixed to the cushion support 10, for example, with an adhesive. The cushion engagement member 12 and the floor connection member 13 may be embedded by insert molding during the foam molding of the cushion support 10.

[0034] As shown in Figures 5 and 8, the cushion support body 11 has a central portion 11a that supports the buttocks and thighs of the seated person, a raised portion 11b provided on both sides of the central portion 11a in the seat width direction, a pad housing portion 11c for housing the floor connecting member 13, a front portion 11d provided in front of the central portion 11a, a rear portion 11e provided behind the central portion 11a, and a stepped portion 11f that protrudes upward from the rear portion 11e and forms a step. In other words, the pad housing portion 11c for housing the floor connecting member 13 is formed in the front portion 11d and the rear portion 11e.

[0035] As shown in Figure 8, the central portion 11a has a roughly square shape when viewed from above. Also, as shown in Figure 6, the central portion 11a slopes gently upward from rear to front when viewed from the side. The embankment portion 11b, as shown in Figures 6 and 8, is a part that bulges upward to support the seated person's buttocks and thighs from the sides.

[0036] As shown in Figure 6, the pad housing section 11c is a circular hole that penetrates in the loading direction (i.e., vertical direction) and houses the floor connecting member 13 inside. The diameter of the hole in the pad housing section 11c is progressively larger on the upper surface 10a side than on the lower surface 10b side, and the floor connecting member 13 is fixed to the smaller diameter section. As shown in Figure 8, two pad housing sections 11c are formed in the front section 11d and two in the rear section 11e. By forming pad housing sections 11c that penetrate vertically in the cushion support body 11, the seat cushion 1 can be made even lighter.

[0037] The front section 11d is located in front of the central section 11a and has a wide area that is wide in the sheet width direction. As shown in Figure 6, the front section 11d slopes gently downward from rear to front in a side view. The rear section 11e is located behind the central section 11a, as shown in Figure 8, and has a narrow area that is narrower than the wide area. The cushion support body 11 has a shape that widens towards the front and is formed smoothly and continuously from the wide area to the narrow area. The embankment section 11b is formed in the central section 11a and the front section 11d (i.e., the wide area), but not in the rear section 11e (i.e., the narrow area).

[0038] As shown in Figure 6, the stepped portion 11f is positioned behind the rear portion 11e and protrudes upward. By forming the stepped portion 11f at the rear end of the cushion support body 11, it is possible to suppress the displacement of the cushion pad material 20 in the front-rear direction when the cushion pad material 20 is laminated. In addition, the central portion 11a and the front portion 11d have a mountain-like shape in a side view so as to correspond to the thighs of the seated person.

[0039] As shown in Figure 8, the cushion engagement member 12 is, for example, a hook-and-loop fastener (loop portion) and is a member for which the cushion engagement member 22 of the cushion pad material 20 engages. The cushion engagement member 12 has a central engagement portion 12a provided in the central portion 11a and a front engagement portion 12b provided in the front portion 11d. Note that the hook-and-loop fastener may be a hook portion. The central engagement portion 12a extends elongated in the front-rear direction and is arranged in four parallel positions spaced apart in the sheet width direction. The front engagement portions 12b extend elongated in the sheet width direction and are arranged one between the pad housing portions 11c and two outside the pad housing portions 11c. The two front engagement portions 12b located outside the pad housing portions 11c are inclined with respect to the sheet width direction. Also, as shown in Figure 8, the two central engagement portions 12a located on the central side in the sheet width direction of the cushion engagement member 12 are located between three grooves 14 in the sheet width direction. In other words, the two central engaging portions 12a located on the central side are positioned so as not to overlap with the groove 14 in the vertical direction.

[0040] As shown in Figure 2, the floor connecting member 13 is a member for attachment to the floor surface F of the mobile body, and is a cylindrical member that is detachably fitted to, for example, a floor connecting member Fa (specifically, a metal pin) formed on the floor surface F. More specifically, the floor connecting member 13 is fixed inside the pad housing 11c and is detachably attached to the floor connecting member Fa of the mobile body. Because the cushion support 10 can be detachably attached to the floor surface F of the mobile body by the floor connecting member 13, maintainability, assembly, and customizability can be improved. The floor connecting member 13 has two front connecting parts 13a arranged on the front side of the lower surface 10b and two rear connecting parts 13b arranged on the rear side of the lower surface 10b. The front connecting parts 13a are arranged between the grooves 14 in the sheet width direction. The rear connecting parts 13b are arranged between the grooves 14 in the sheet width direction (i.e., in a position aligned with the front connecting parts 13a in the front-rear direction).

[0041] As shown in Figure 7, the groove 14 is a long groove formed on the surface (i.e., the bottom surface 10b) of the cushion support 10 opposite to the lamination surface (i.e., the top surface 10a) on which the cushion pad material 20 is laminated. In other words, the groove 14 is a space for reducing the weight of the cushion support 10. The groove 14 is a space formed during foam molding, but it may also be formed by hollowing it out after foam molding, or by other methods. When viewed from the lamination direction (i.e., the vertical direction) in which the cushion pad material 20 is laminated on the cushion support 10, the groove 14 extends linearly in the direction intersecting the sheet width direction (i.e., the front-to-back direction). The groove 14 has a central groove 14a formed in the central part in the sheet width direction, and two lateral grooves 14b provided at positions spaced apart from the central groove 14a in the sheet width direction.

[0042] As described above, the presence of multiple grooves 14 makes it possible to reduce the weight of the seat cushion 1. Furthermore, since the grooves 14 are positioned along the thighs of the person sitting, it is possible to increase the rigidity of the cushion support 10 while reducing the weight.

[0043] Furthermore, in a view from the underside of the seat, the floor connecting member 13 is positioned between the central groove 14a and the lateral grooves 14b in the width direction of the seat. Specifically, in a view from the underside of the seat, the front connecting portion 13a of the floor connecting member 13 is positioned between the front end of the central groove 14a and the front end of the lateral grooves 14b. The rear connecting portion 13b of the floor connecting member 13 is positioned on the rear portion 11e of the cushion support body 11 and is provided in a position where it does not overlap the grooves 14 in the width direction of the seat. In this way, since the floor connecting member 13 is provided in a position where it is easily deflected (between the grooves 14), the design intersection of the floor connecting member 13 can be absorbed by the deflection of the grooves 14. Also, since the floor connecting member 13 is positioned in a position where it is less likely to deflect (between the front ends of the grooves 14) within the grooves 14, the rigidity of the cushion support body 11 can be increased.

[0044] As shown in FIGS. 9 and 10, the concave groove 14 has a concave shape that is recessed upward from the lower surface 10b and has a flat groove bottom surface 15. The groove bottom surface 15 of the concave groove 14 extends parallel to the lamination surface when viewed in the sheet width direction. In other words, corresponding to the mountain shape of the lamination surface (that is, the upper surface 10a of the cushion support 10), the groove bottom surface 15 has an upward inclined surface 15a that slopes upward as it goes forward and a downward inclined surface 15b that slopes downward as it goes forward. That is, in a side view of the sheet, the groove bottom surface 15 of the central concave groove 14a and the groove bottom surface 15 of the side concave groove 14b each have a vertex 16. Thus, since the groove bottom surface 15 extends parallel to the lamination surface of the cushion support 10, the thickness of the portion where the concave groove 14 is formed on the upper surface 10a side of the cushion support main body 11 becomes substantially uniform. Therefore, the generation of stress concentration in the cushion support 10 can be suppressed.

[0045] The vertex 16 on the groove bottom surface 15 of the central concave groove 14a is higher than the vertex 16 on the groove bottom surface 15 of the side concave groove 14b. In other words, the length L1 from the lower surface 10b to the vertex 16 of the central concave groove 14a is longer than the length L2 from the lower surface 10b to the vertex 16 of the side concave groove 14b. Also, in a side view of the sheet, the vertex 16 on the groove bottom surface 15 of the side concave groove 14b is located behind the vertex 16 on the groove bottom surface 15 of the central concave groove 14a. In other words, as shown in FIG. 7, the length L3 from the rear end of the cushion support main body 11 to the vertex 16 of the central concave groove 14a is longer than the length L4 from the rear end of the cushion support main body 11 to the vertex 16 of the side concave groove 14b.

[0046] As shown in FIGS. 9 and 10, the position of the vertex 16 differs according to the position of the concave groove 14, and the central concave groove 14a is formed larger than the side concave groove 14b. In other words, the thickness of the portion on the upper surface 10a side of the cushion support body 11 where the side concave groove 14b is formed is formed thicker than the thickness of the portion where the central concave groove 14a is formed. Therefore, by forming the relatively lightly loaded central concave groove 14a large to reduce the weight and forming the relatively heavily loaded side concave groove 14b small, the rigidity of the cushion support 10 can be ensured. Also, since the vertex 16 of the side concave groove 14b is at the rear, the legs of the seated person can be suitably supported.

[0047] The cushion pad material 20 is a soft foam formed from a foamed resin such as urethane foam, and supports the buttocks and thighs of the seated person. The cushion pad material 20 is formed softer and has a lower hardness than the cushion support 10. Therefore, while the support force of the seat cushion 1 is increased by the highly rigid cushion support 10, the seating feeling can be improved by the flexible cushion pad material 20. Note that the cushion pad material 20 may have a higher hardness than the cushion support 10.

[0048] As shown in FIG. 4, the surface 20a of the cushion pad material 20 serves as the seating surface on which the seated person sits. A suspension groove 20c for suspending the cushion skin material 30 and a cut-away groove 20d for accommodating the cut of the cushion skin material 30 are formed in the surface 20a of the cushion pad material 20. The back surface 20b of the cushion pad material 20 is, as shown in FIG. 2, a facing surface facing the laminated surface of the cushion support 10. The back surface 20b has a shape corresponding to the laminated surface and is a smooth surface.

[0049] As shown in Figures 11 and 12, the cushion pad material 20 includes a cushion pad body 21 that supports the occupant from below, a cushion engagement member 22 that detachably engages with the cushion support 10, a cushion locking member 23 that detachably locks with the cushion surface material 30, and a suspension member 24 for suspending the cushion surface material 30. The cushion engagement member 22 and the cushion locking member 23 are provided on the back surface 20b of the cushion pad material 20. The suspension member 24 is provided inside the suspension groove 20c on the front surface 20a side of the cushion pad material 20. The cushion engagement member 22, the cushion locking member 23, and the suspension member 24 are each fixed to the cushion pad material 20, for example, with adhesive. The cushion engagement member 22, the cushion locking member 23, and the suspension member 24 may be embedded by insert molding during the foam molding of the cushion pad material 20.

[0050] The cushion engagement member 22 and the cushion locking member 23 are provided only on the back surface 20b of the cushion pad material 20. That is, the cushion surface material 30 engages only with the suspension member 24 on its surface 20a. In this way, since the cushion engagement member 22 and the cushion locking member 23 are not provided on the surface 20a of the cushion pad material 20, it is possible to suppress the occurrence of wrinkles in the cushion surface material 30 on the surface 20a side of the cushion pad material 20. In addition, since the cushion surface material 30 is arranged flat, the unevenness of the cushion surface material 30 can be suppressed.

[0051] As shown in Figure 5, the cushion pad body 21 includes a support portion 21a that supports the buttocks and thighs of the seated person, pad ridge portions 21b provided on both sides of the support portion 21a in the seat width direction, a pad step portion 21c that is formed to be thinner along the contour of the cushion pad material 20, a front side portion 21d provided in front of the support portion 21a, a rear side portion 21e provided behind the support portion 21a, and a protruding portion 21f that protrudes rearward from the rear side portion 21e, corresponding to the shape of the rear portion 11e and step portion 11f of the cushion support 10.

[0052] As shown in Figure 13, the support portion 21a has a roughly square shape when viewed from above. Also, as shown in Figure 11, the support portion 21a slopes gently upward from rear to front when viewed from the side. The padded embankment portion 21b is a part that bulges upward to support the seated person's buttocks and thighs from the sides.

[0053] As shown in Figure 11, the pad step portion 21c is a recessed portion extending upward from the back surface 20b of the cushion pad material 20. As shown in Figure 12, the pad step portion 21c is formed along the contour of the cushion pad material 20. Multiple cushion locking members 23 are arranged on the pad step portion 21c. The pad step portion 21c is thinner by the thickness of the cushion locking members 23 and the cushion surface material 30. Therefore, when the cushion surface material 30 is locked to the cushion pad material 20, the cushion surface material 30 and the back surface 20b become flush, and the surface facing the laminated surface can be made flat.

[0054] As shown in Figure 13, the front portion 21d is located in front of the support portion 21a and has a wide area that is wide in the sheet width direction. As shown in Figure 11, the front portion 21d slopes gently downward from rear to front in a side view. As shown in Figure 13, the rear portion 21e is located behind the support portion 21a and has a narrow area that is narrower than the wide area. The cushion pad body 21 has a shape that widens towards the front and is formed smoothly and continuously from the wide area to the narrow area. The pad ridge portion 21b is formed on the support portion 21a and the front portion 21d (i.e., the wide area), but not on the rear portion 21e (i.e., the narrow area).

[0055] As shown in Figure 11, the protruding portion 21f is positioned behind the rear portion 21e and protrudes backward. By forming the protruding portion 21f at the rear end of the cushion pad body 21, as shown in Figure 2, it is possible to suppress the displacement of the cushion pad material 20 in the front-rear direction when the protruding portion 21f is laminated on the stepped portion 11f of the cushion support 10. In addition, the support portion 21a and the front portion 21d have a mountain-like shape in a side view so as to correspond to the thighs of the person sitting.

[0056] As shown in Figure 12, the cushion engaging member 22 is, for example, a hook fastener (hook portion) and is a member for engaging with the cushion engaging member 12 of the cushion support 10. The cushion engaging member 22 has a central engaging portion 22a provided on the support portion 21a and a front engaging portion 22b provided on the front side portion 21d. Note that the hook fastener may be a loop portion. The central engaging portion 22a extends elongated in the front-rear direction and four of them are arranged parallel to each other and spaced apart in the sheet width direction. The outer central engaging portions 22a are arranged along the outer shape of the cushion pad material 20 and extend elongated in the front-rear direction than the inner central engaging portions 22a. In other words, the inner central engaging portions 22a are shorter than the outer central engaging portions 22a. By using elongated hook fasteners in this way, misalignment and wrinkle formation can be suppressed more effectively than by increasing the number of hook fasteners. Furthermore, using elongated hook fasteners can suppress the feeling of unevenness. The front engaging portion 22b extends elongated in the seat width direction, with one positioned in the center of the pad step portion 21c and two positioned on the outside in the seat width direction. The two front engaging portions 22b positioned on the outside of the pad step portion 21c are inclined with respect to the seat width direction.

[0057] As shown in Figure 12, the cushion locking member 23 is, for example, a hook-and-loop fastener (loop portion) and is a member for locking onto the cushion locking member 32 of the cushion surface material 30. Multiple cushion locking members 23 are arranged on the pad step portion 21c along the contour of the cushion pad material 20. Note that the hook-and-loop fastener may be a hook portion. When viewed from the stacking direction (i.e., from the bottom view), the cushion engagement member 22 is positioned inside the cushion locking member 23. Also, when viewed from the stacking direction, the cushion locking member 23 is positioned closer to the contour of the cushion pad material 20 than the cushion engagement member 22.

[0058] Thus, the cushion locking member 23 is positioned near the contour, and the cushion engaging member 22 is positioned inside the cushion locking member 23. As shown in Figure 14, since the cushion locking member 23 is covered by the cushion surface material 30, it is possible to prevent the cushion engaging member 22, which is inside the cushion locking member 23, from coming into contact with the worker's hand when the worker grips the cushion pad material 20.

[0059] Furthermore, cushion locking members 23 are provided in the straight sections 20e of the cushion pad material 20 where the contour extends in a straight line. Only one cushion locking member 23 (specifically, a straight locking portion 23a) is provided corresponding to each straight section 20e. In other words, only one long straight locking portion 23a corresponding to each straight section 20e is provided, and the straight locking portion 23a is not divided. In this way, since only one cushion locking member 23 is provided corresponding to each straight section 20e, it is possible to suppress the occurrence of wrinkles in the cushion surface material 30. Also, since the cushion surface material 30 is arranged flat, it is possible to suppress the unevenness of the cushion surface material 30.

[0060] The number and position of the cushion locking members 23 are not limited to those shown. In this embodiment, the cushion locking members 23 provided on the curved portion of the contour of the cushion pad material 20 consist of a plurality of straight-shaped cushion locking members 23. However, for example, the cushion locking members 23 may have a curved shape corresponding to the curved portion. Also, a straight-line locking portion 23a may be divided and arranged for a single straight portion 20e.

[0061] As shown in Figure 13, the suspension member 24 is, for example, a hook-and-loop fastener (loop portion) and is a member for engaging with the surface suspension member 33 of the cushion surface material 30. Multiple suspension members 24 are arranged inside the suspension groove 20c of the cushion pad material 20. Note that the suspension members 24 are not placed at the intersections or curved parts of the suspension groove 20c. Therefore, the structure is designed to facilitate the suspension of the cushion surface material 30. As shown in Figures 13 and 14, in a bottom view, a part of the cushion engagement member 22 is arranged to intersect the suspension groove 20c. As shown in Figure 15, the surface suspension member 33 of the cushion surface material 30 is suspended by the suspension member 24. Note that the suspension structure is not limited to the hook-and-loop fastener structure described above, but may be other suspension structures.

[0062] As shown in Figure 15, the cushion surface material 30 includes a cushion surface 31 that covers the cushion pad material 20, a cushion locking member 32 for attaching and detaching the cushion surface 31 to the cushion pad material 20, and a surface suspension member 33 for suspending the cushion surface 31 in the suspension groove 20c. As shown in Figure 2, the cushion surface 31 covers the surface 20a of the cushion pad material 20 and extends to the back surface 20b of the cushion pad material 20. The extended end of the cushion surface 31 is then locked to the cushion locking member 23 provided on the back surface 20b of the cushion pad material 20.

[0063] The cushion locking member 32 is, for example, a hook fastener (hook portion) and is a member for locking the cushion locking member 23 of the cushion pad material 20. The cushion locking member 32 is fixed to the end of the cushion surface 31 by adhesive or sewing. In this way, the cushion surface material 30 can be attached to and detached from the cushion pad material 20 with a relatively lightweight hook fastener, making the seat cushion 1 even lighter.

[0064] The surface suspension member 33 is, for example, a hook fastener (hook portion) and is a member for suspending the cushion surface 31 to the suspension member 24 of the cushion pad material 20. The surface suspension member 33 is sewn to the cushion surface 31 at a position corresponding to the suspension groove 20c. In this way, the cushion surface material 30 is suspended with a relatively lightweight hook fastener, making the seat cushion 1 even lighter.

[0065] <<Detailed Configuration of the Seat Back>> Next, we will describe each component of the seat back 2. Figure 4 shows the seat back with the back surface material 60 removed from the back pad material 50. The seat back 2 has a two-layer structure in which a back support 40 made of a first foam and a back pad material 50 made of a second foam are laminated together. As shown in Figure 5, the back pad material 50 can be removed from the back support 40.

[0066] The back support 40 is a rigid foam made, for example, from expanded polypropylene (EPP), and supports the back and head of the seated person. As shown in Figure 2, the front surface 40a of the back support 40 is a laminated surface on which the back pad material 50 is laminated. The rear surface 40b of the back support 40 is a mounting surface for attaching it to the wall surface W of the mobile body. The rear surface 40b is a flat surface and is attached to a flat wall surface W.

[0067] As shown in Figure 6, the back support 40 includes a back support body 41 that supports the occupant from the rear and a back engagement member 42 for engaging with the back pad material 50. Furthermore, as shown in Figures 2 and 16, a wall connection member 43 is provided on the rear surface 40b of the back support 40 for attachment to a wall connection member Wa provided on the wall surface W of the moving body. The back engagement member 42 and the wall connection member 43 are fixed to the back support 40, for example, with adhesive. Note that the back engagement member 42 and the wall connection member 43 may be embedded by insert molding during the foam molding of the back support 40. The back support body 41 of the back support 40 has a U-shape when viewed from the direction supporting the occupant (i.e., in a front view). Because the back support 40, made of the first foam, has a U-shape, it can support the occupant from the side, ensuring a secure hold. Also, because the back support 40 supports part of the occupant's back or buttocks, it can be made even lighter. Furthermore, because the back support 40 has a U-shape, the area corresponding to the seated person's back is flatter than if it were, for example, H-shaped, thus reducing discomfort for the seated person.

[0068] As shown in Figures 5, 16, and 17, the back support body 41 has an extended portion 41a that extends in the sheet width direction, a first lateral portion 41b and a second lateral portion 41c that extend upward from both ends of the extended portion 41a in the sheet width direction, and a housing portion 41d that houses the wall connecting member 43. In other words, the first lateral portion 41b and the second lateral portion 41c of the back support body 41 have housing portions 41d that house the wall connecting member 43.

[0069] As shown in Figure 17, the extended portion 41a has a rectangular shape that is elongated in the seat width direction when viewed from the front. The first lateral portion 41b and the second lateral portion 41c are portions that bulge forward to support the torso of the seated person from the side, as shown in Figures 5 and 6. Also, as shown in Figure 3, when the back pad material 50 engages with the back support 40, the upper ends of the first lateral portion 41b and the second lateral portion 41c are located below the upper end of the back pad material 50. In this way, the back support 40 is formed smaller than the back pad material 50, so that the seat back 2 can be made compact, and the overall size of the seat can be prevented from becoming larger. Furthermore, because the size can be prevented from becoming larger, the ease of installation is improved.

[0070] As shown in Figure 6, the storage section 41d is a circular hole that penetrates in the loading direction (i.e., the front-to-back direction) and houses the wall connecting member 43 inside. The diameter of the hole in the storage section 41d is progressively larger on the front 40a side than on the rear 40b side, and the wall connecting member 43 is fixed to the smaller diameter section. As shown in Figure 17, two storage sections 41d are formed on the first lateral section 41b and two lateral sections 41c, respectively. By forming storage sections 41d that penetrate vertically through the back support body 41, the seat back 2 can be made even lighter.

[0071] As shown in Figure 17, the back engaging member 42 is, for example, a hook-and-loop fastener (loop portion) and is a member for which the back engaging member 52 of the back pad material 50 engages. The back engaging member 42 is located in the center of the extended portion 41a in a front view. The back engaging member 42 extends elongated in the sheet width direction and one is arranged on the extended portion 41a. Note that the hook-and-loop fastener may be a hook portion.

[0072] As shown in Figure 2, the wall connection member 43 is a member for attachment to the wall surface W of the mobile body, and is a cylindrical member that is detachably fitted to, for example, a wall connection member Wa (specifically a metal pin) formed on the wall surface W. More specifically, the wall connection member 43 is fixed inside the housing section 41d and is detachably attached to the wall connection member Wa of the mobile body. Because the back support 40 can be detachably attached to the wall surface W of the mobile body by the wall connection member 43, maintainability, assembly, and customizability can be improved. The wall connection member 43 has two first connection sections 43a located on the right first lateral section 41b and two second connection sections 43b located on the left second lateral section 41c. The two first connection sections 43a are arranged side by side in the vertical direction. The two second connection sections 43b are at the same height as the first connection sections 43a and are arranged side by side in the vertical direction.

[0073] The back pad material 50 is a soft foam made from a foamed resin such as urethane foam, and supports the back and head of the sitter. The back pad material 50 is made to be softer and less hard than the back support 40. Therefore, the support force of the seat back 2 can be increased by the rigid back support 40, while the seating feel can be improved by the flexible back pad material 50. The back pad material 50 may be harder than the back support 40.

[0074] As shown in Figure 4, the surface 50a of the back pad material 50 is the seating surface on which the sitter sits. The surface 50a of the back pad material 50 has a suspension groove 50c for suspending the back upholstery material 60 and a splice relief groove 50d for accommodating the splices of the back upholstery material 60. As shown in Figure 2, the back surface 50b of the back pad material 50 is a surface facing the laminated surface and wall surface W of the back support 40. The lower part of the back surface 50b has a shape corresponding to the laminated surface of the back support 40 and is a smooth surface. The upper part of the back surface 50b has a shape corresponding to the wall surface W and is a flat surface.

[0075] As shown in Figures 11 and 18, the back pad material 50 includes a back pad body 51 that supports the sitter from the rear, a back engaging member 52 that detachably engages with the back support 40, a back locking member 53 that detachably locks with the back surface material 60, a suspension member 54 for suspending the back surface material 60, and a mounting member 55 that detachably attaches to a mounting member Wb on the wall surface W. The back engaging member 52, the back locking member 53, and the mounting member 55 are provided on the back surface 50b of the back pad material 50. The suspension member 54 is provided inside the suspension groove 50c on the front surface 50a side of the back pad material 50. The back engaging member 52, the back locking member 53, the suspension member 54, and the mounting member 55 are each fixed to the back pad material 50, for example, with adhesive. The back engagement member 52, back locking member 53, suspension member 54, and mounting member 55 may be embedded by insert molding during the foam molding of the back pad material 50.

[0076] The back engagement member 52, back locking member 53, and mounting member 55 are provided only on the back surface 50b of the back pad material 50. That is, the back surface material 60 engages only with the suspension member 54 on its surface 50a. In this way, since the back engagement member 52 and back locking member 53 are not provided on the surface 50a of the back pad material 50, it is possible to suppress the occurrence of wrinkles in the back surface material 60 on the surface 50a side of the back pad material 50. In addition, since the back surface material 60 is arranged flat, the unevenness of the back surface material 60 can be suppressed.

[0077] As shown in Figures 5, 18, and 20, the back pad body 51 has a pressure-receiving portion 51a that supports the back and head of the sitter, a raised portion 51b provided on both sides of the pressure-receiving portion 51a in the seat width direction, a stepped portion 51c formed with a thin thickness along the contour of the back pad material 50, and a second stepped portion 51d that is recessed in the stacking direction from the stepped portion 51c. Furthermore, an engaging recess 51e is formed on the back surface 50b of the back pad material 50, recessed in the stacking direction and engaging with the first lateral portion 41b and the second lateral portion 41c. In other words, the engaging recess 51e is a portion recessed forward from the back surface 50b of the back pad material 50. In addition, a through hole 51f is formed in the back pad body 51 that penetrates in the front-rear direction.

[0078] As shown in Figure 19, the pressure-receiving portion 51a has a shape that extends vertically in a front view. As shown in Figure 3, when viewed from the stacking direction (i.e., in a rear view of the sheet back 2), the pressure-receiving portion 51a is positioned between the first lateral portion 41b and the second lateral portion 41c in the sheet width direction. Also, as shown in Figure 2, the back surface of the pressure-receiving portion 51a and the mounting surfaces of the first lateral portion 41b and the second lateral portion 41c to the wall surface W are flush. Because the mounting surface of the back pad material 50 is flush, the pressure-receiving portion 51a is suitably supported by the wall surface W. Therefore, rattling of the mobile sheet S can be suppressed. In addition, the back support 40 can be made smaller, so the mobile sheet S can be made even lighter.

[0079] The pressure-receiving portion 51a of the back pad material 50 is detachably attached to the wall surface W. In other words, the pressure-receiving portion 51a is supported from the rear by the first lateral portion 41b, the second lateral portion 41c and the wall surface W. In this way, since the back pad material 50 is supported by both the back support 40 and the wall surface W of the moving body, the support force of the back pad material 50 can be increased while reducing its weight.

[0080] As shown in Figure 11, the embankment portion 51b is a part that bulges forward to support the torso of the seated person from the side. An engagement recess 51e is formed in the rear portion of the embankment portion 51b.

[0081] As shown in Figures 18 and 20, the stepped portion 51c is a recessed portion on the back surface 50b of the back pad material 50 that extends forward from the pressure-receiving portion 51a. The stepped portion 51c is formed along the contour of the back pad material 50. Specifically, the stepped portion 51c is formed on the outer edge of the back surface 50b and on the periphery of the through hole 51f. Multiple back locking members 53 are arranged on the stepped portion 51c. The thickness of the stepped portion 51c is reduced by the thickness of the back locking members 53 and the back surface material 60. Therefore, when the back surface material 60 is locked to the back pad material 50, the back surface material 60 and the back surface 50b become flush, and the surface facing the laminated surface can be made flat.

[0082] As shown in Figures 18 and 20, the second step portion 51d is a recessed portion on the back surface 50b of the back pad material 50 that extends forward from the step portion 51c. The second step portion 51d is formed on the outside of the through hole 51f in the sheet width direction. A back locking member 53 is positioned in the second step portion 51d. The back locking member 53 (specifically the linear locking portion 53a) positioned in the second step portion 51d is positioned continuously between the step portion 51c and the second step portion 51d.

[0083] The second stage portion 51d is thinner by the thickness of the back locking member 53 and the two back surface materials 60. Therefore, when the back surface material 60 is locked to the back pad material 50, the back surface material 60 and the back surface 50b become flush, making the surface facing the wall W flat. In particular, the back surface material 60 is arranged overlapping on the outside of the through hole 51f in the sheet width direction. Therefore, even if there are parts where multiple back surface materials 60 overlap, these parts are located in the deeper recessed second stage portion 51d, so the back surface 50b of the back pad material 50 becomes flat. Consequently, when the back pad material 50 and the back support 40 are laminated together, rattling of the back pad material 50 can be suppressed.

[0084] As shown in Figure 21, hook-and-loop fasteners may be provided in the overlapping portion 51g where the back surface materials 60 overlap, for attaching and detaching the back surface materials 60 from each other. Providing hook-and-loop fasteners on the back surface materials 60 helps to prevent the back surface materials 60 from shifting position when they are secured to the back pad material 50.

[0085] As shown in Figure 11, the engaging recess 51e is formed behind the first lateral portion 41b and the second lateral portion 41c and is recessed forward. As shown in Figure 2, the engaging recess 51e engages with the first lateral portion 41b and the second lateral portion 41c, thereby supporting the back pad material 50 on the back support 40. By forming the engaging recess 51e on the back surface 50b of the back pad material 50 in a manner corresponding to the shape of the back support 40, it is possible to suppress misalignment of the back pad material 50 in the vertical and sheet width directions when the back pad material 50 is laminated on the back support 40. Furthermore, since the first lateral portion 41b and the second lateral portion 41c themselves engage with the back pad material 50, there is no need to provide a separate member for engagement. Therefore, it is possible to suppress an increase in the overall size of the sheet.

[0086] As shown in Figure 3, the through-hole 51f extends in the front-to-back direction and is a hole for inserting a seat belt (not shown). The seat belt, which is positioned on the wall surface W of the mobile body, is inserted through the through-hole 51f and holds both shoulders of the occupant seated in the mobile body seat S. The seat belt may also hold only one shoulder of the occupant. In this case, there may be only one through-hole 51f formed in the back pad material 50.

[0087] As shown in Figure 18, the back engaging member 52 is, for example, a hook fastener (hook portion) and is a member for engaging with the back engaged member 42 of the back support 40. In a rear view, the back engaging member 52 is provided at the lower end of the pressure receiving portion 51a. The back engaging member 52 extends elongated in the sheet width direction and is positioned as a single unit at the lower end of the pressure receiving portion 51a. In other words, only one back engaging member 52 is provided on the back pad material 50 and is positioned opposite the extended portion 41a. The hook fastener may also be a loop portion. In this way, since only one back engaging member 52 is provided on the back pad material 50, the number of parts can be reduced while ensuring support force.

[0088] As shown in Figure 18, the back locking member 53 is, for example, a hook-and-loop fastener (loop portion) and is a member for locking the back locking member 62 of the back surface material 60. Multiple back locking members 53 are arranged on the stepped portion 51c and the second stepped portion 51d along the outer edge of the back surface 50b of the back pad material 50 and the periphery of the through hole 51f. Note that the hook-and-loop fastener may be a hook portion. When viewed from the stacking direction (i.e., from the back view), the back engaging member 52 is positioned inside the back locking member 53. Also, when viewed from the stacking direction, the back locking member 53 is positioned closer to the contour of the back pad material 50 than the back engaging member 52.

[0089] Thus, the back locking member 53 is positioned near the contour, and the back engaging member 52 is positioned inside the back locking member 53. As shown in Figure 21, since the back locking member 53 is covered by the back surface material 60, it is possible to prevent the back engaging member 52, which is inside the back locking member 53, from coming into contact with the worker's hand when the worker grips the back pad material 50.

[0090] Furthermore, as shown in Figure 18, a back locking member 53 is provided on the straight portion 50e of the back pad material 50 where the contour extends in a straight line. Only one back locking member 53 (specifically, a straight locking portion 53a) is provided corresponding to the straight portion 50e. In other words, only one long straight locking portion 53a corresponding to one straight portion 50e is provided, and the straight locking portion 53a is not divided. In this way, since only one back locking member 53 is provided corresponding to the straight portion 50e, the occurrence of wrinkles in the back surface material 60 can be suppressed. In addition, since the back surface material 60 is arranged flat, the unevenness of the back surface material 60 can be suppressed.

[0091] The number and position of the back locking members 53 are not limited to those shown. In this embodiment, the back locking members 53 provided on the curved portion of the contour of the back pad material 50 consist of a plurality of back locking members 53 having a straight shape. However, for example, the back locking members 53 may have a curved shape corresponding to the curved portion. Also, a straight locking portion 53a may be divided and arranged for a single straight portion 50e.

[0092] As shown in Figure 19, the suspension member 54 is, for example, a hook-and-loop fastener (loop portion) and is a member for engaging with the surface suspension member (not shown) of the back surface material 60. Multiple suspension members 54 are arranged inside the suspension groove 50c of the back pad material 50. Note that the surface suspension structure of the back surface material 60 is the same as that of the cushion surface material 30, so a detailed explanation is omitted.

[0093] As shown in Figure 2, the mounting member 55 is, for example, a hook fastener (hook portion) and is detachably attached to the mounting member Wb on the wall surface W (specifically, the loop portion of the hook fastener). As shown in Figure 18, multiple mounting members 55 are arranged on the pressure receiving portion 51a and the stepped portion 51c on the back surface 50b of the back pad material 50. Note that the hook fastener may be the loop portion. When viewed from the stacking direction (i.e., from the back), the mounting members 55 are positioned inside the back locking member 53. Also, the number of back engaging members 52 is less than the number of mounting members 55. Specifically, one back engaging member 52 and nine mounting members 55 are provided on the back surface 50b of the back pad material 50.

[0094] Thus, the back locking member 53 is positioned near the contour, and the mounting member 55 is positioned inside the back locking member 53. As shown in Figure 21, since the back locking member 53 is covered by the back surface material 60, it is possible to prevent the mounting member 55, which is inside the back locking member 53, from coming into contact with the worker's hand when the worker grips the back pad material 50. In addition, by making the number of back engaging members 52 less than the number of mounting members 55, the number of back engaging members 42 provided on the back support 40 can be reduced. Therefore, since there are fewer back engaging members 52 that engage the back pad material 50 and the back support 40, the number of steps required to attach and detach the back pad material 50 and the back support 40 can be reduced. Furthermore, the overall weight of the seat back 2 can be reduced.

[0095] Although the mounting member 55 is provided only on the seat back 2, it may also be provided on the seat cushion 1. In this case, a part of the cushion pad material 20 is detachably attached to the floor surface F.

[0096] As shown in Figure 2, the back cover material 60 includes a back cover 61 that covers the back pad material 50, and a back locking member 62 for attaching and detaching the back cover 61 to the back pad material 50. The back cover 61 covers the surface 50a of the back pad material 50 and extends to the back surface 50b of the back pad material 50. The extended end of the back cover 61 is locked to a back locking member 53 provided on the back surface 50b of the back pad material 50.

[0097] The back locking member 62 is, for example, a hook fastener (hook portion) and is a member for locking the back locking member 53 of the back pad material 50. The back locking member 62 is fixed to the end of the back surface 61 by adhesive or sewing. The hook fastener may also be a loop portion. In this way, the back surface material 60 can be attached to and detached from the back pad material 50 with a relatively lightweight hook fastener, which further reduces the weight of the seat back 2.

[0098] <Second Embodiment> The second embodiment of the mobile body sheet S2 according to the present invention will be described below with reference to Figures 22 and 23. Note that the configurations that overlap with the mobile body sheet S described above will not be explained.

[0099] The mobile seat S2 includes a seat cushion 101 that supports the seated person's buttocks and a seat back 102 that supports the seated person's back and head. The seat back 102 includes a back support 140. In the mobile seat S2, the configuration of the back support 140 differs from the configuration of the back support 40 of the mobile seat S.

[0100] As shown in Figures 22 and 23, the back support 140 has a back support body 141 that supports the seated person from behind. The rear surface 140b of the back support 140 is provided with a wall connecting member 143 for attachment to a wall connecting member Wa, and a plurality of grooves 144. As shown in Figure 22, the grooves 144 extend linearly in a direction intersecting the seat width direction (i.e., vertical direction) when viewed from the stacking direction (i.e., front-to-back direction) in which the back pad material is stacked on the back support 140. The grooves 144 have three first grooves 144a located on the first lateral portion 141b and three second grooves 144b located on the second lateral portion 141c. The three first grooves 144a are arranged linearly in the vertical direction. The three second grooves 144b are arranged linearly in the vertical direction.

[0101] As shown in Figure 23, the groove 144 is a groove formed on the side of the back support 140 opposite to the laminated surface (i.e., the front surface 140a) (i.e., the rear surface 140b). Since multiple grooves 144 are provided in this way, the weight of the seat back 102 can be reduced.

[0102] The groove 144 is concave, recessed forward from the rear surface 140b, and has a flat groove bottom surface 145. When viewed from the sheet width direction, the groove bottom surface 145 of the groove 144 extends parallel to the laminated surface. In other words, the groove bottom surface 145 is inclined to correspond to the mountain shape of the laminated surface (i.e., the front surface 140a of the back support 140). Because the groove bottom surface 145 extends parallel to the laminated surface of the back support 140 in this way, the thickness of the portion of the back support body 141 on the front surface 140a side where the groove 144 is formed becomes substantially uniform. Therefore, the occurrence of stress concentration in the back support 140 can be suppressed.

[0103] Furthermore, as shown in Figure 22, in a rear view, the right wall connecting member 143 is positioned between the first grooves 144a arranged in the vertical direction. The left wall connecting member 143 is positioned between the second grooves 144b arranged in the vertical direction. In this way, since the wall connecting members 143 are provided between the easily flexible grooves 144, the design intersection of the wall connecting members 143 can be absorbed by the deflection of the grooves 144.

[0104] <Third Embodiment> The third embodiment of the mobile body sheet S3 according to the present invention will be described below with reference to Figure 24. Note that the configurations that overlap with the mobile body sheets S and S2 described above will not be explained.

[0105] The mobile seat S3 comprises a seat cushion 201 that supports the seated person's buttocks and a seat back 202 that supports the seated person's back and head. The front portion of the cushion support 210 of the seat cushion 201 protrudes downward to match the floor surface F. The upper portion of the back support 240 of the seat back 202 protrudes backward to match the wall surface W. By configuring the shapes of the seat cushion 201 and the seat back 202 to match the floor surface F or wall surface W, respectively, the mobile seat S3 can be easily attached to and detached from the mobile vehicle.

[0106] <Fourth Embodiment> The fourth embodiment of the mobile body sheet S4 according to the present invention will be described below with reference to Figure 25. Note that the configurations that overlap with the mobile body sheets S, S2, and S3 described above will not be explained.

[0107] The mobile seat S4 includes a seat cushion 301 that supports the seated person's buttocks and a seat back 302 that supports the seated person's back and head. The rear portion of the cushion support 310 of the seat cushion 301 protrudes downward to match the floor surface F. The lower portion of the back support 340 of the seat back 302 protrudes backward to match the wall surface W. By configuring the shapes of the seat cushion 301 and the seat back 302 to match the floor surface F or wall surface W, respectively, the mobile seat S4 can be easily attached to and detached from the mobile vehicle.

[0108] <Fifth Embodiment> The fifth embodiment of the mobile body sheet S5 according to the present invention will be described below with reference to Figure 26. Note that the configurations that overlap with the mobile body sheets S, S2, S3, and S4 described above will not be explained.

[0109] The mobile seat S5 comprises a seat cushion 401 that supports the seated person's buttocks and a seat back 402 that supports the seated person's back and head. The front portion of the cushion support 410 of the seat cushion 401 is cut out upward to match the floor surface F. The lower portion of the back support 440 of the seat back 402 is cut out forward to match the wall surface W. By configuring the shapes of the seat cushion 401 and the seat back 402 to match the floor surface F or wall surface W, respectively, the mobile seat S5 can be easily attached to and detached from the mobile vehicle.

[0110] <Sixth Embodiment> The mobile sheet S6 of the sixth embodiment of the present invention will be described below with reference to Figure 27. Note that the configurations that overlap with the mobile sheets S, S2, S3, S4, and S5 described above will not be explained.

[0111] The mobile seat S6 comprises a seat cushion 501 that supports the seated person's buttocks and a seat back 502 that supports the seated person's back and head. The rear portion of the cushion support 510 of the seat cushion 501 is cut out upward to match the floor surface F. The upper portion of the back support 540 of the seat back 502 is cut out forward to match the wall surface W. By configuring the shapes of the seat cushion 501 and the seat back 502 to match the floor surface F or wall surface W, respectively, the mobile seat S6 can be easily attached to and detached from the mobile vehicle.

[0112] <Seventh Embodiment> The seventh embodiment of the mobile body sheet S7 according to the present invention will be described below with reference to Figure 28. Note that the configurations that overlap with the mobile body sheets S, S2, S3, S4, S5, and S6 described above will not be described.

[0113] The mobile seat S7 includes a seat cushion 601 that supports the seated person's buttocks and a seat back 602 that supports the seated person's back. The cushion support 610 of the seat cushion 601 has a cushion support body 611 that supports the seated person from below and a cushion engaging member 612 for engaging with a cushion pad material (not shown). The cushion support body 611 of the cushion support 610 has a U-shape when viewed from the direction supporting the seated person (i.e., in a top view). The back support 640 of the seat back 602 has a back support body 641 that supports the seated person from the rear and a back engaging member 642 for engaging with a back pad material (not shown).

[0114] In other words, the mobile seat S7 is configured by swapping the seat cushion 1 and seat back 2 of the mobile seat S. Because the cushion support 610 has a U-shape, when the seat cushion 601 is placed on the floor surface F, a portion of the cushion pad material can be directly attached to the floor surface F.

[0115] <Other Embodiments> The mobile seat S is configured by applying one substantially square support and one U-shaped support to the seat cushion 1 and the seat back 2, but the shape of the support is not limited to these. For example, the substantially square support may be applied to both the seat cushion 1 and the seat back 2. Alternatively, the U-shaped support may be applied to both the seat cushion 1 and the seat back 2. Furthermore, the mobile seat S is not limited to a configuration that includes both the seat cushion 1 and the seat back 2. For example, the mobile seat S may be configured to include only the seat cushion 1, or to include only the seat back 2.

[0116] <Manufacturing Method> The manufacturing method for the mobile sheet S is as follows. Note that the manufacturing process for the mobile sheet S other than those described below will not be explained.

[0117] A method for manufacturing a seat S for a mobile body includes the steps of placing a seat cushion 1 on the floor surface F of the mobile body and placing a seat back 2 on the wall surface W of the mobile body. The seat back 2 may be placed on the mobile body first, or the seat cushion 1 and seat back 2 may be placed simultaneously.

[0118] To elaborate, first, the worker prepares the cushion support 10, cushion pad material 20, cushion surface material 30, back support 40, back pad material 50, and back surface material 60. Specifically, the cushion support 10 and back support 40 are foam-molded to form a first high-hardness foam. Then, the cushion pad material 20 and back pad material 50 are foam-molded to form a second low-hardness foam.

[0119] Then, the worker attaches the cushion surface material 30 to the cushion pad material 20. Specifically, the worker covers the surface 20a of the cushion pad material 20 with the cushion surface material 31 and locks the cushion locking member 32 to the cushion locking member 23. At this time, the surface material suspension member 33 is attached to the suspension member 24 and the cushion surface material 31 is suspended in the suspension groove 20c.

[0120] Furthermore, the worker attaches the cushion support 10 to the floor surface F. Specifically, the worker fits the floor connecting member 13 onto the floor connecting member Fa of the floor surface F. Then, with the cushion surface material 30 attached to the cushion pad material 20, the worker grasps the cushion pad material 20 and stacks the cushion pad material 20 onto the cushion support 10. Specifically, the worker engages the cushion engaging member 22 with the cushion engaging member 12 from above. In this way, the seat cushion 1 is placed on the floor surface F. At this time, the worker positions the cushion pad material 20 such that the cushion surface material 30 is located between the cushion support 10 and the cushion pad material 20 in the vertical direction.

[0121] Next, the worker attaches the back surface material 60 to the back pad material 50. Specifically, the worker covers the surface 50a of the back pad material 50 with the back surface material 61 and locks the back locking member 62 to the back locking member 53. At this time, the surface suspension member (not shown) is attached to the suspension member 54 and the back surface material 61 is suspended in the suspension groove 50c. The worker also attaches the back support 40 to the wall surface W. Specifically, the worker fits the wall connecting member 43 to the wall connecting member Wa of the wall surface W. Then, with the back surface material 60 attached to the back pad material 50, the worker grasps the back pad material 50 and attaches it to the wall surface W while stacking the back pad material 50 on the back support 40. Specifically, the worker engages the back engaging member 52 with the back engaging member 42 from the front and attaches the mounting member 55 to the mounting member Wb from the front. In this way, the seat back 2 is positioned on the wall surface W. At this time, the worker positions the back pad material 50 such that the back surface material 60 is located between the back support 40 and the back pad material 50 in the front-to-back direction.

[0122] Alternatively, the cushion pad material 20 may be attached to the cushion support 10 first, and then the cushion support 10 may be attached to the floor surface F. More specifically, the worker attaches the cushion surface material 30 to the cushion pad material 20. Then, the cushion pad material 20 is engaged with the cushion support 10. After that, the cushion support 10, cushion pad material 20, and cushion surface material 30 are attached to the floor surface F. Alternatively, the back pad material 50 may be attached to the back support 40 first, and then the back support 40 may be attached to the wall surface W.

[0123] In this way, a mobile seat S can be manufactured that is lightweight while improving maintainability, ease of assembly, and customizability.

[0124] In the above embodiment, a seat for a mobile vehicle used in an aircraft such as an eVTOL was described as a specific example, but it is not particularly limited and can be used for various seats such as seats for automobiles, motorcycles, trains and buses, airplanes and ships, as well as office chairs for work, wheelchairs, and children's seats in shopping carts.

[0125] In this embodiment, the description mainly concerned a sheet for a mobile body according to the present invention. However, the above embodiment is merely an example to facilitate understanding of the present invention and does not limit the present invention. The present invention can be modified and improved without departing from its spirit, and of course, equivalents thereof are included in the present invention.

[0126] <Note 1> The above problem is solved by providing a sheet for a mobile body, comprising a support made of a first foam, and a pad material made of a second foam that is softer than the first foam, laminated on the support, wherein a long groove is formed on the surface of the support opposite to the laminated surface on which the pad material is laminated, the groove extends in a direction intersecting the sheet width direction when viewed from the laminated direction on which the pad material is laminated on the support, and the bottom surface of the groove extends parallel to the laminated surface when viewed from the sheet width direction.

[0127] With the above configuration, the groove bottom extends parallel to the laminated surface of the support, resulting in a nearly uniform thickness of the support. Therefore, stress concentration in the support can be suppressed. Consequently, the rigidity of the support can be increased while reducing the weight of the sheet for the mobile body.

[0128] In this configuration, the seat for the mobile body has a seat cushion for supporting the buttocks of the occupant, the seat cushion has a support body and a pad material, the groove has a central groove formed in the center in the width direction of the seat and lateral grooves provided at positions spaced apart from the central groove in the width direction of the seat, in a side view of the seat, the bottom surface of the central groove and the bottom surface of the lateral grooves each have a vertex, and it is preferable that the vertex on the bottom surface of the central groove is higher than the vertex on the bottom surface of the lateral grooves. With the above configuration, the rigidity of the support body can be ensured by making the central groove, which is not subjected to a relatively large load, larger to reduce weight, while making the lateral grooves, which are subjected to a relatively large load, smaller.

[0129] In this configuration, when viewed from the side of the seat, the apex of the lateral groove at the bottom of the groove is preferably located further back than the apex of the central groove at the bottom of the groove. With this configuration, since the apex of the lateral groove is located further back, the legs of the occupant can be adequately supported.

[0130] In this configuration, a connecting member for attachment to a connected member provided on the floor surface of the mobile body is provided on the lower surface of the support, and in a view of the underside of the sheet, the connecting member is preferably positioned between the central groove and the lateral grooves in the width direction of the sheet. With this configuration, since the connecting member is provided in a position that is easily flexible (between the grooves), the design intersection of the connecting member can be absorbed by the deflection of the grooves.

[0131] In this configuration, when viewed from below the sheet, the connecting member is preferably positioned between the front end of the central groove and the front end of the lateral groove. With this configuration, the connecting member is positioned in a location that is less prone to bending between the grooves (between the front ends of the grooves), thereby increasing the rigidity of the support.

[0132] <Note 2> The above problem is solved by a seat for a mobile body, which is made of a first foam material and includes a support for a person sitting on it, wherein the support has a U-shape when viewed from the direction in which the person sitting is supported, and has an extended portion that extends in the width direction of the seat, and a first lateral portion and a second lateral portion that extend from both ends of the extended portion in the width direction of the seat, respectively.

[0133] With the above configuration, the support made of the first foam has a U-shape, which allows it to support the occupant from the side and ensures good hold. Furthermore, since the support supports part of the occupant's back or buttocks, it can be made even lighter. Therefore, the entire seat can be made lighter while ensuring good hold.

[0134] In this configuration, the support is laminated with a pad material made of a second foam that is softer than the first foam. The back surface of the pad material has an engagement recess formed in the direction in which the pad material is laminated on the support, which engages with the first and second lateral portions. The pad material is supported by the support when the engagement recess engages with the first and second lateral portions. With this configuration, the lateral portions themselves engage with the pad material, eliminating the need to provide separate members for engagement. Therefore, it is possible to prevent the overall sheet from becoming too large.

[0135] In this configuration, the seat for the mobile body has a seat back for supporting the back of the occupant, and the seat back has a support and a pad material, and the first and second lateral portions extend upward from both ends in the seat width direction of the extended portion, and the upper ends of the first and second lateral portions are preferably located below the upper ends of the pad material. With this configuration, the support is formed smaller than the pad material, so that the overall size of the seat does not become larger can be suppressed.

[0136] In this configuration, the support body is provided with a connecting member for attachment to a member to be connected provided on the wall or floor surface of the mobile body, and the connecting member is preferably detachably attached to the member to be connected on the mobile body. With this configuration, the support body can be detachably attached to the wall or floor surface of the mobile body by the connecting member, thereby improving maintainability, ease of assembly, and customizability.

[0137] In this case, the first and second lateral portions are formed to accommodate the connecting members, and the accommodation portions may extend through in the stacking direction. With the above configuration, by providing accommodation portions that extend through in the stacking direction (i.e., spaces for weight reduction), the sheet for the mobile body can be made even lighter.

[0138] In this configuration, the pad material has a pressure-receiving portion positioned between the first and second lateral portions in the sheet width direction when viewed from the stacking direction, and the back surface of the pressure-receiving portion and the mounting surfaces of the first and second lateral portions to the wall or floor are preferably flush. With this configuration, since the mounting surface of the pad material is flush, the pressure-receiving portion is suitably supported by the wall or floor. Therefore, rattling of the mobile sheet can be suppressed. In addition, the support can be made smaller, so the mobile sheet can be made even lighter.

[0139] In this configuration, the pad material has an engaging member that detachably engages with the support and a mounting member that detachably attaches to the wall or floor, and the number of engaging members is preferably less than the number of mounting members. With this configuration, the number of engaging members that engage the pad material and the support is small, so the number of steps required to attach and detach the pad material and the support can be reduced.

[0140] In this case, the engaging member is preferably provided as only one on the pad material and positioned opposite the extended portion. With this configuration, since there is only one engaging member that engages the pad material and the support, the number of parts can be reduced while ensuring support force.

[0141] S, S2, S3, S4, S5, S6, S7 Seats for mobile bodies 1, 101, 201, 301, 401, 501, 601 Seat cushions 2, 102, 202, 302, 402, 502, 602 Seat backs 10, 110, 210, 310, 410, 510, 610 Cushion support (support) 10a Top surface 10b Bottom surface 11, 611 Cushion support body 11a Center part 11b Embankment part 11c Pad housing part 11d Front part 11e Rear part 11f Step part 12, 612 Cushion engaging member 12a Central engaging part 12b Front engaging part 13 Floor connecting member 13a Front connecting part 13b Rear connecting part 14 Groove 14a Central groove 14b Lateral groove 15 Groove bottom surface 15a Upward inclined surface 15b Downward inclined surface 16 Apex 20 Cushion pad material (pad material) 20a Surface 20b Back surface 20c Hanging groove 20d Peeling escape groove 20e Straight section 21 Cushion pad body 21a Support part 21b Pad embankment part 21c Pad stepped part (stepped part) 21d Front side part 21e Rear side part 21f Protruding part 22 Cushion engaging member (engaging member) 22a Central engaging part 22b Front engaging part 23 Cushion locking member (locking member) 23a Straight locking part 24 Hanging member 30 Cushion surface material (surface material) 31 Cushion surface 32 Cushion locking member 33 Surface hanging member 40, 140, 240, 340, 440, 540, 640 Back support (support) 40a, 140a Front 40b, 140b Rear 41, 141, 641 Back support body 41a Extended part 41b, 141b First side part 41c, 141c Second side part 41d Housing part 42, 642 Back engaged member 43, 143 Wall connecting member 43a First connecting part 43b Second connecting part 144 Groove 144a First groove 144b Second groove 145 Groove bottom surface 50 Back pad material (pad material) 50a Front surface 50b Back surface 50c Hanging groove 50d Relief groove 50e Straight part 51 Back pad body 51a Pressure-receiving portion 51b, embankment portion 51c, stepped portion 51d, second stepped portion 51e, engaging recess 51f, through hole51g Overlapping portion 52 Back engaging member (engaging member) 53 Back locking member (locking member) 53a Straight locking portion 54 Suspension member 55 Mounting member 60 Back surface material (surface material) 61 Back surface 62 Back locked member F Floor surface Fa Floor connecting member W Wall surface Wa Wall connecting member Wb Mounted member

Claims

1. A sheet for a mobile body, comprising: a support made of a first foam; a pad material made of a second foam that is softer than the first foam and laminated on the support; and a surface material that covers the pad material, wherein the surface material covers the surface of the pad material and extends to the back surface of the pad material, and the pad material is detachably engaged with the support.

2. The sheet for a mobile body according to claim 1, wherein the pad material has an engaging member that detachably engages with the support and a locking member that detachably locks with the surface material, the engaging member and the locking member are provided on the back surface of the pad material, and when viewed from the stacking direction in which the pad material is stacked on the support, the engaging member is positioned inward from the locking member.

3. The sheet for a mobile body according to claim 1, wherein the pad material has an engaging member that detachably engages with the support and a locking member that detachably locks with the surface material, the engaging member and the locking member are provided on the back surface of the pad material, and when viewed from the stacking direction in which the pad material is stacked on the support, the locking member is positioned closer to the contour of the pad material than the engaging member.

4. The sheet for a mobile body according to claim 1, characterized in that the support is attached to the wall or floor surface of the mobile body, and a part of the pad material is detachably attached to the wall or floor surface.

5. The sheet for a mobile body according to claim 4, wherein the pad material comprises an engaging member that detachably engages with the support, a locking member that detachably locks with the surface material, and a mounting member that detachably attaches to the wall surface or the floor surface, the engaging member, the locking member and the mounting member are provided on the back surface of the pad material, and when viewed from the stacking direction in which the pad material is stacked on the support, the mounting member is positioned inward from the locking member.

6. The sheet for a mobile body according to claim 1, wherein the pad material has an engaging member that detachably engages with the support and a locking member that detachably locks with the surface material, the engaging member and the locking member are provided on the back surface of the pad material, the locking member is arranged along the contour of the pad material, and when viewed from the stacking direction in which the pad material is stacked on the support, the locking member is provided in the straight portion where the contour of the pad material extends in a straight line, and only one locking member is provided corresponding to the straight portion.

7. The sheet for a mobile body according to claim 1, wherein the pad material has an engaging member that detachably engages with the support and a locking member that detachably locks with the surface material, the engaging member and the locking member are provided on the back surface of the pad material, a recessed step is formed on the back surface of the pad material in the stacking direction for stacking the pad material on the support, and the locking member is arranged on the step.

8. The sheet for a mobile body according to claim 7, characterized in that a second stepped portion is formed on the back surface of the pad material, which is recessed in the stacking direction more than the stepped portion, and the locking member is arranged on the second stepped portion.

9. The sheet for a mobile body according to claim 1, wherein a suspension groove for suspending the surface material is formed on the surface of the pad material, the pad material has an engaging member that detachably engages with the support, a locking member that detachably locks with the surface material, and a suspension member for suspending the surface material, the suspension member is provided inside the suspension groove, and the locking member is provided only on the back surface of the pad material.

10. A sheet for a mobile body, comprising: a support made of a first foam; and a pad material made of a second foam that is softer than the first foam and laminated on the support, wherein the support is disposed on the wall or floor surface of the mobile body; a portion of the pad material is detachably attached to the wall or floor surface; and the pad material is detachably engaged with the support.

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