Structure

Abstract

This suppresses the relatively large variation in surface pressure on external members at different points in the structure when the structure deforms due to compressive force from external members. [Solution] The structure comprises a first elastic member having a plurality of first parts extending along a predetermined direction and spaced apart along that predetermined direction, and a second part which is the portion between two adjacent first parts; and a second elastic member having a plurality of third parts extending in a curve along a predetermined direction and each joined to a first part, and a fourth part which is the portion between two adjacent third parts and is convex on the side moving away from the second part. Furthermore, the structure comprises a third elastic member which is joined to or in contact with a first predetermined surface of the first elastic member opposite to the second elastic member, has lower rigidity than the first and second elastic members, and the thickness of the sixth part which is the portion between two fifth parts corresponding to two first parts increases as it moves away from the two fifth parts.

Description

Technical Field

[0001] This disclosure relates to a structure.

Background Art

[0002] Conventionally, a structure has been proposed that includes a first elastic member extending linearly along a predetermined direction, and a second elastic member having a convex shape on a side where at least a part of an intermediate portion, which is a portion between both end portions in the predetermined direction and is joined to the first elastic member at both end portions in the predetermined direction, is separated from the first elastic member (see Patent Document 1). When a pressing force in a direction approaching the first elastic member is applied to the intermediate portion of the second elastic member by an external member in this structure, a compressive stress in the predetermined direction is generated in the second elastic member and a tensile stress in the predetermined direction is generated in the first elastic member along with bending deformation of the intermediate portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described structure, when the structure is deformed by the above-described pressing force, the surface pressure from the first elastic member to the external member tends to increase at both end portions joined to the second elastic member and is unlikely to increase at the intermediate portion not joined to the second elastic member. For this reason, the surface pressure from the structure to the external member may vary relatively greatly depending on the position of the structure.

[0005] The main object of the structure of this disclosure is to suppress the relatively large variation in the surface pressure to the external member depending on the position of the structure when the structure is deformed by the pressing force from the external member.

Means for Solving the Problems

[0006] The structure of this disclosure employs the following means to achieve the primary objective described above.

[0007] The structure of this disclosure is A first elastic member having a plurality of first portions extending along a predetermined direction and spaced apart along the predetermined direction, and a second portion which is the portion between two adjacent first portions, A second elastic member having a plurality of third portions that extend in a curved shape along the predetermined direction and are joined to the first portion, and a fourth portion that is convex on the side separated from the second portion and is located between two adjacent third portions, A structure comprising, A third elastic member is bonded to or in contact with a first predetermined surface of the first elastic member opposite to the second elastic member, and has lower rigidity than the first and second elastic members, and the thickness of the sixth portion, which is the portion between the two fifth portions corresponding to the two first portions, increases as it moves away from the two fifth portions. The gist of it is that it is equipped with the following features.

[0008] The structure of this disclosure comprises a third elastic member in addition to the first and second elastic members. The third elastic member is joined to or in contact with a first predetermined surface of the first elastic member opposite to the second elastic member, has lower rigidity than the first and second elastic members, and the thickness of the sixth portion, which is the portion between two fifth portions corresponding to two first portions, increases as it moves away from the two fifth portions. This makes it possible to suppress relatively large variations in surface pressure on external members at different locations on the structure when the structure deforms due to pressing force from external members.

[0009] The second structure of this disclosure is A first elastic member having a plurality of first portions extending along a predetermined direction and spaced apart along the predetermined direction, and a second portion which is the portion between two adjacent first portions, A second elastic member having a plurality of third portions that extend in a curved shape along the predetermined direction and are joined to the first portion, and a fourth portion that is convex on the side separated from the second portion and is located between two adjacent third portions, A structure comprising, A third elastic member is bonded to or in contact with a first predetermined surface of the first elastic member opposite to the second elastic member, and has lower rigidity than the first and second elastic members, and the rigidity of the sixth portion, which is the portion between the two fifth portions corresponding to the two first portions, increases as it moves away from the two fifth portions. The gist of it is that it is equipped with the following features.

[0010] The second structure of this disclosure comprises a third elastic member in addition to the first and second elastic members. The third elastic member is bonded to or in contact with a first predetermined surface of the first elastic member opposite to the second elastic member, and has lower rigidity than the first and second elastic members, and the rigidity of the sixth part, which is the portion between two fifth parts corresponding to two first parts, increases as it moves away from the two fifth parts. This makes it possible to suppress relatively large variations in surface pressure on external members from one position to the other when the structure deforms due to pressing force from an external member. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view of the external appearance of the structure of the embodiment. [Figure 2] This is a front view of the structure of the embodiment. [Figure 3] This is a process diagram showing the manufacturing process of the structure of the embodiment. [Figure 4] This is an explanatory diagram showing the deformation of the structure of the embodiment. [Figure 5] This is an explanatory diagram showing the deformation of the comparative structure. [Figure 6] This is an explanatory diagram showing the relationship between the displacement and surface pressure of the structure in the embodiment. [Figure 7]It is an explanatory diagram showing the relationship between the displacement and surface pressure of the structure of the comparative example. [Figure 8] It is an external perspective view of the structure of the modified example. [Figure 9] It is a front view of the structure of the modified example. [Figure 10] It is an external perspective view of the structure of the modified example. [Figure 11] It is an exploded perspective view of the structure of the modified example. [Figure 12] It is a front view of the structure of the modified example.

Mode for Carrying Out the Invention

[0012] A mode (embodiment) for carrying out the present disclosure will be described with reference to the drawings. FIG. 1 is an external perspective view of the structure 20 of the embodiment, and FIG. 2 is a front view of the structure 20. The front-rear direction, left-right direction, and up-down direction of the structure 20 are as shown in FIGS. 1 and 2, but these are shown exemplarily for the purpose of explanation and do not limit the direction or posture when implementing the structure 20 and the like of the present embodiment. As shown in FIGS. 1 and 2, the structure 20 includes a first elastic member 30, a second elastic member 40, and a third elastic member 50. <000009!> The first elastic member 30 is in the shape of a rectangular flat plate having a substantially constant thickness and extends linearly or curvilinearly along the front-rear direction and the left-right direction (in the illustrated example, it extends linearly). The first elastic member 30 has n (n≧2) first portions 31 spaced at a predetermined interval along the left-right direction, and n - 1 second portions 32 which are portions between two adjacent first portions 31. In the embodiment, the case where n is 7 is shown in FIGS. 1 and 2, but it is not limited thereto.

[0014] The second elastic member 40 is disposed below the first elastic member 30. The second elastic member 40 has a substantially constant thickness. The second elastic member 40 has n third portions 41 spaced at a predetermined interval (the same interval as the interval between the first portions 31) along the left-right direction, and n - 1 fourth portions 42 which are portions between two adjacent third portions 41. In the up-down direction, the n third portions 41 respectively correspond to (overlap) the n first portions 31, and the n - 1 fourth portions 42 respectively correspond to the n - 1 second portions 32. The n third portions 41 are respectively joined to the n first portions 31. These joints are performed, for example, by welding, adhesion, brazing, riveting, etc. The second elastic member 40 extends linearly along the front-back direction and extends so as to be separated from the second portion 32 as it is separated from the third portions 41 on both sides in the left-right direction at the fourth portion 42. That is, the fourth portion 42 has a convex shape on the lower side. The second elastic member 40 extends in a wave shape along the left-right direction as a whole. "Extending in a wave shape" may extend, for example, in a shape combining a plurality of curves (such as arcs), in a sine wave shape, or in a shape including a curved portion and a straight portion.

[0015] The left and right ends of the first and second elastic members 30, 40 are joined to each other by caulking. By this caulking, caulked portions 21, 22 are formed. The caulked portions 21, 22 are formed by folding at least one of them back to one side of the first and second elastic members 30, 40 in a state where the first and second elastic members 30, 40 are overlapped. In the embodiment, the caulked portions 21, 22 are formed by folding the second elastic member 40 back once to the first elastic member 30 side in a state where the first and second elastic members 30, 40 are overlapped, and then folding the first and second elastic members 30, 40 together back once to the first elastic member 30 side. Generally, the mechanical strength due to the structure of the caulked portions 21, 22 is higher than the mechanical strength due to welding, adhesion, etc. Therefore, when a vertical pressing force is applied to the structure 20, although a shearing force is generated between the first and second elastic members 30, 40, the caulked portions 21, 22 make it more possible to maintain the joining of both ends of the first and second elastic members 30, 40.

[0016] The third elastic member 50 is positioned above the first elastic member 30. The third elastic member 50 has n fifth parts 51 spaced at predetermined intervals (the same intervals as the first and third parts 31 and 41) along the left-right direction, and n-1 sixth parts 52 which are the parts between two adjacent fifth parts. In the vertical direction, the n fifth parts 51 correspond to (overlap with) the n first and third parts 31 and 41, respectively, and the n-1 sixth parts 52 correspond to the n-1 second and fourth parts 32 and 42, respectively. The lower surface of the third elastic member 50 is a plane that extends linearly along the front-rear and left-right directions. The lower surface of the third elastic member 50 is joined to the upper surface of the first elastic member 30, excluding the left and right ends (crimping parts 21 and 22). This joining is performed, for example, by adhesive. The upper surface of the third elastic member 50 extends linearly along the front-rear direction, and also extends away from the lower surface as it moves away from the fifth portions 51 on both sides in the left-right direction at the sixth portion 52. That is, the upper surface of the sixth portion 52 is a curved surface that is convex upwards. The upper surface of the third elastic member 50 as a whole extends in a wave shape along the left-right direction. From these observations, the thickness of the sixth portion 52 of the third elastic member 50 increases as it moves away from the fifth portions 51 on both sides in the left-right direction. The third elastic member 50 has lower rigidity than the first and second elastic members 30. When a vertical pressure is applied to the entire upper surface of the third elastic member 50, it has enough rigidity to deform the second portion 32 of the first elastic member 30 into a convex shape downwards (towards the fourth portion 42 of the second elastic member 40) accompanied by deformation of the third elastic member 50.

[0017] The first elastic member 30 is formed from, for example, spring steel, carbon fiber reinforced plastic (CFRP), etc. The second elastic member 40 is formed from, for example, spring steel, carbon fiber reinforced plastic, etc. The materials of the first and second elastic members 30 and 40 may be the same or different. The third elastic member 50 is formed from, for example, rubber material (rubber hardness of about 50° to 70°), rubber-like elastomer material, polypropylene (PP), etc.

[0018] The structure 20 of the embodiment is manufactured, for example, by the manufacturing method shown in Figure 3. In the manufacturing method shown in Figure 3, the first and second elastic members 30 and 40 are stacked (step S100), and the n first and third portions 31 and 41 of the first and second elastic members 30 and 40 are joined to each other, forming crimped portions 21 and 22 (step S110). Subsequently, the third elastic member 50 is joined to the upper surface of the first elastic member 30 (step S120), completing the structure 20. Note that step S120 may be performed before step S100.

[0019] Figure 4 is an explanatory diagram showing an example of the deformation of the structure 20 when a vertical pressing force Fe is applied to the structure 20 of the embodiment by the flat plates 91 and 92 (external members). Figure 5 is an explanatory diagram showing an example of the deformation of the structure 920 of the comparative example when a vertical pressing force Fc is applied to the structure 920 by the flat plates 91 and 92. The structure 920 corresponds to the structure 20 with the third member 50 removed, and is not shown. The flat plates 91 and 92 are flat, rigid bodies that extend linearly along the front-rear and left-right directions. The flat plate 91 is formed to a size that can press the entire upper surface of the structure 20 (the upper surface of the third elastic member 50) or the entire first elastic member 30 excluding the left and right ends (the crimping portions 21 and 22).

[0020] Figure 4(A) shows the structure 20 in its initial state with the plates 91 and 92 positioned above and below it. Figures 4(B) to 4(E) show how the structure 20 gradually deforms (the displacement of the structure 20 increases) due to the pressing force Fe. Figure 5(A) shows the structure 920 in its initial state with the plates 91 and 92 positioned above and below it. Figures 5(B) to 5(E) show how the structure 920 gradually deforms due to the pressing force Fc. The displacement of structures 20 and 920 is the change in the height (length in the vertical direction) of structures 20 and 920 from their initial state.

[0021] As shown in Figures 5(A) to 5(E), when a vertical pressing force Fc is applied to the comparative example structure 920 by the flat plates 91 and 92, the fourth portion 42 of the second elastic member 40 gradually bends and deforms so that it approaches the second portion 32 of the first elastic member 30. At this time, the pressing force Fc is converted into a left-right force on the second elastic member 40 (a force that separates the two adjacent third portions 41) and transmitted to the first elastic member 30 via the third and first portions 41 and 31 as a left-right tensile force (a force that separates the two adjacent first portions 31). Consequently, a left-right compressive stress σ2c (a stress that brings the two adjacent third portions 41 closer together) is generated inside the second elastic member 40, and a tensile stress σ1c (a force that separates the two adjacent first portions 31) is generated inside the first elastic member 30. The structure 920 generates a reaction force Rc to the pressing force Fc due to the compressive stress σ2c inside the second elastic member 40 and the tensile stress σ1c inside the first elastic member 30. However, when the structure 920 deforms, the surface pressure from the first elastic member 30 to the flat plate 91 tends to be larger at the first part 31 joined to the second elastic member 40, and less likely to be larger (may be approximately 0) at the second part 32 not joined to the second elastic member 40 (especially at positions in the second part 32 that are somewhat separated from two adjacent first parts 31). For this reason, the surface pressure from the structure 920 to the flat plates 91 and 92 may vary considerably from position to position in the structure 920.

[0022] On the other hand, as shown in Figures 4(A) to 4(C), in the structure 20 of the embodiment, when a vertical pressing force Fe is applied by the flat plates 91 and 92, the sixth and second portions 52 and 32 of the third and first elastic members 50 and 30 deform until the upper surface of the sixth portion 52 of the third elastic member 50 becomes flat (shape along the lower surface of the flat plate 91), and the lower surface of the sixth portion 52 and the second portion 32 become convex downwards. Also, as shown in Figures 4(A) to 4(E), when a vertical pressing force Fe is applied to the structure 20 by the flat plates 91 and 92, similar to the deformation of the structure 920, the fourth portion 42 of the second elastic member 40 gradually bends and deforms so that it approaches the second portion 32 of the first elastic member 30. At this time, the pressing force Fe is converted into a left-right force on the second elastic member 40 (a force that separates the two adjacent third parts 41), and transmitted to the first elastic member 30 via the third and first parts 41, 31 as a left-right tensile force (a force that separates the two adjacent first parts 31). The deformation of the fourth portion 42 of the second elastic member 40 and the deformation of the second portion 32 of the first elastic member 30 into a downward convex shape generate a compressive stress σ2e in the left-right direction (a stress in the direction that brings two adjacent third portions 41 closer together) inside the second elastic member 40, and a tensile stress σ1ea (a force in the direction that separates two adjacent first portions 31) inside the first elastic member 30. Furthermore, a normal stress σ1eb is generated at each position of the second portion 32 of the first elastic member 30 in a direction that brings the second portion 32 closer to a linear shape from a downward convex shape (perpendicular to the extension direction of the second portion 32). The structure 20 generates a reaction force Re to the pressing force Fc due to the compressive stress σ2e inside the second elastic member 40, the tensile stress σ1ea inside the first elastic member 30, and the normal stress σ1eb at each position of the second portion 32 of the first elastic member 30. In the structure 20, the reaction force Re includes the normal stress σ1eb at each position of the second part 32 (specifically, the vertical component of the normal stress σ1eb), so the surface pressure on the flat plate 91 at each position of the sixth part 52 of the third elastic member 50 is greater than the surface pressure on the flat plate 91 at each position of the second part 32 of the first elastic member 30 of the structure 920. Therefore, it is possible to suppress the relatively large variation in the surface pressure from the structure 20 to the flat plates 91 and 92 at each position of the structure 20.Furthermore, it is possible to suppress the relatively large surface pressure at the fifth portion 51 of the third elastic member 50.

[0023] Figure 6 is an explanatory diagram showing the relationship between the displacement and surface pressure of the structure 20 of the embodiment. Figure 7 is an explanatory diagram showing the relationship between the displacement and surface pressure of the structure 920 of the comparative example. The relationship between Figures 6 and 7 was obtained by analysis by the inventors. In Figures 6 and 7, the dotted lines show the maximum value (maximum surface pressure) of the surface pressure at each position of the structures 20 and 920, the dashed lines show the minimum value (minimum surface pressure) of the surface pressure at each position of the first elastic member 30, and the solid lines show the average value (average surface pressure) of the surface pressure at each position of the first elastic member 30. In Figures 6 and 7, the values ​​of the horizontal axis scale (0, D1, D2, ...) and the vertical axis scale (0, P1, P2, ...) are the same. The origin of Figures 6 and 7 corresponds to the initial state (the state in Figures 4(A) and 5(A)), respectively.

[0024] As shown in Figures 6 and 7, the maximum and average surface pressures of structures 20 and 920 gradually increase as the displacement increases, then become approximately constant, and then increase again. The displacement region in which the maximum and average surface pressures are approximately constant is approximately the same for structures 20 and 920. The maximum surface pressure of structure 20 is significantly smaller than that of structure 920. As shown in Figure 7, the minimum surface pressure of structure 920 is approximately 0 regardless of the displacement, whereas, as shown in Figure 6, the minimum surface pressure of structure 20, like the maximum and average surface pressures, gradually increases as the displacement increases, then becomes approximately constant, and then increases again. From these findings, it can be said that in any displacement region, the difference between the maximum and minimum surface pressures of structure 20 is smaller than that of structure 920, meaning that the variation in surface pressure from position to position of structure 20 is suppressed.

[0025] Furthermore, it is preferable that the initial shapes (shapes in the state shown in Figure 4(A)) of the second, fourth, and sixth portions 32, 42, and 52 of the first, second, and third elastic members 30, 40, and 50 are determined such that the second portion 32 of the first elastic member 30 does not come into contact with the fourth portion 42 of the second elastic member 40 within the allowable displacement range of the structure 20. This is because if the second portion 32 and the fourth portion 42 come into contact, the relationship between the displacement and stress (surface pressure) of the structure 20 will change as a result. In other words, it is preferable to define the allowable displacement range of the structure 20 within the range in which the second portion 32 and the fourth portion 42 do not come into contact.

[0026] As described above, in the structure 20 of the embodiment, the first and third portions 31 and 41 of the first and second elastic members 30 and 40 are joined to each other, and the third elastic member 50 is joined to the side of the first elastic member 30 opposite to the second elastic member 40. The third elastic member 50 is formed of a material with lower rigidity than the first and second elastic members 30 and 40, i.e., it has lower rigidity. In the third elastic member 50, the thickness of the sixth portion 52 between two fifth portions 51 corresponding to two adjacent first portions 31 increases as it moves away from the two fifth portions 51. This makes it possible to suppress the relatively large variation in surface pressure on the external member from the structure 20 at different positions when the structure 20 deforms due to the pressing force on the external member in the height direction (up and down direction in Figures 1 and 2).

[0027] In the embodiments described above, the initial shapes of the first and third elastic members 30 and 50 were as shown in Figures 2 and 4(A). Specifically, in the initial shapes of the first and third elastic members 30 and 50, the lower surfaces of the first elastic member 30 and the third elastic member 50 extended linearly along the left-right direction, and the upper surface of the third elastic member 50 was convex upward at the sixth portion 52. However, the invention is not limited to this, and it is sufficient that the thickness of the sixth portion 52 of the third elastic member 50 increases as it moves away from the first portions 31 on both sides in the left-right direction.

[0028] For example, the initial shapes of the first and third elastic members 30 and 50 may be as shown in Figure 4(B). Specifically, in the initial shapes of the first and third elastic members 30 and 50, the lower surfaces of the first elastic member 30 and the third elastic member 50 may be convex downwards at the second and sixth portions 32 and 52, and the upper surface of the third elastic member 50 may be convex upwards at the sixth portion 52. In this case, the structure 20 is referred to as structure 20B. Structure 20B deforms as shown in Figures 4(B) to 4(E). When a vertical pressing force is applied to structure 20B, the fourth portion 42 of the second elastic member 40 deforms to approach the second portion 32 of the first elastic member 30, and the second portion 32 of the first elastic member 30 is convex downwards, thereby suppressing relatively large variations in surface pressure on external members at different positions of structure 20B.

[0029] Furthermore, the initial shapes of the first and third elastic members 30 and 50 may be as shown in Figure 4(C). Specifically, in the initial shapes of the first and third elastic members 30 and 50, the lower surfaces of the first elastic member 30 and the third elastic member 50 are convex downwards at the second and sixth portions 32 and 52, and the upper surface of the third elastic member 50 may extend linearly along the left-right direction. In this case, the structure 20 is referred to as structure 20C. Structure 20C deforms as shown in Figures 4(C) to 4(E). When a vertical pressing force is applied to structure 20C, similar to structure 20B, the fourth portion 42 of the second elastic member 40 deforms to approach the second portion 32 of the first elastic member 30, and the second portion 32 of the first elastic member 30 is convex downwards, thereby suppressing relatively large variations in surface pressure on external members at different positions of structure 20C.

[0030] Furthermore, in the initial shape of the first and third elastic members 30 and 50, the lower and upper surfaces of the first elastic member 30 and the third elastic member 50 may have an upwardly convex shape at the second and sixth portions 32 and 52. In this case, the structure 20 is referred to as structure 20D. When a vertical pressing force is applied to structure 20D, similar to structure 20 in the embodiment described above, the fourth portion 42 of the second elastic member 40 deforms to approach the second portion 32 of the first elastic member 30, and the second portion 32 of the first elastic member 30 deforms into a downwardly convex shape, thereby suppressing relatively large variations in surface pressure on the external member at each position of structure 20D.

[0031] In the embodiment described above, the thickness of the sixth portion 52 of the third elastic member 50 increases as it moves away from the fifth portions 51 on both the left and right sides, but the embodiment is not limited to this. For example, in addition to or instead of this, the rigidity of the sixth portion 52 of the third elastic member 50 (rigidity due to factors other than thickness) may increase as it moves away from the fifth portions 51 on both the left and right sides. In this case, the rigidity of each position of the sixth portion 52 may be adjusted by changing the density or composition. The structure 20 in this case is referred to as structure 20E. As the rigidity of the sixth portion 52 of the third elastic member 50 (rigidity due to factors other than thickness) increases as it moves away from the fifth portions 51 on both the left and right sides, the third elastic member 50 becomes more susceptible to deformation of the second portion 32 of the first elastic member 30 into a convex shape downward (towards the fourth portion 42 of the second elastic member 40) when a vertical pressing force is applied to its entire upper surface, accompanied by deformation of the third elastic member 50. When vertical pressure is applied to the structure 20E, similar to the structure 20 of the embodiment described above, the fourth portion 42 of the second elastic member 40 deforms to approach the second portion 32 of the first elastic member 30, and the second portion 32 of the first elastic member 30 deforms into a downward convex shape, thereby suppressing relatively large variations in surface pressure on the external member at each position of the structure 20E.

[0032] In the embodiment described above, the third elastic member 50 is joined to the first elastic member 30, but it may also be positioned to contact the first elastic member 30 without being joined to it. In this case, it is required that the position of the third elastic member 30 does not shift relative to the first elastic member 30.

[0033] In the embodiment described above, the left and right ends of the first and second elastic members 30 and 40 are joined to each other by crimping, but they do not necessarily have to be joined to each other.

[0034] In the embodiments described above, the structure 20 has been explained, but the invention is not limited thereto. Figure 8 is an external perspective view of a modified structure 120, and Figure 9 is a front view of the structure 120. The front-rear, left-right, and up-down directions of the structure 120 are as shown in Figures 8 and 9, but these are illustrative for explanatory purposes and do not limit the direction or orientation when implementing the structure 120. As shown in Figures 8 and 9, the structure 120 comprises structures 120A and 120B. Structure 120A is the same as the structure 20 shown in Figures 1 and 2. Structure 120B is the inverted version of structure 120A. The fourth portion 42 of the second elastic member 40 of structure 120A and the fourth portion 42 of the second elastic member 40 of structure 120B are joined to each other. Similar to structure 20, structure 120 can suppress relatively large variations in surface pressure on external members at different positions when structure 120 deforms due to vertical pressure (up and down direction in Figures 8 and 9) from external members.

[0035] Figure 10 is an external perspective view of a modified structure 220, and Figure 11 is an exploded perspective view of structure 220. The front-to-back, left-to-right, and up-to-down directions of structure 220 are as shown in Figures 10 and 11, but these are illustrative for explanatory purposes and do not limit the direction or orientation when implementing structure 220. As shown in Figures 10 and 11, structure 220 comprises structures 220A and 220B. Structure 220A is the same as structure 20. Structure 220B is obtained by inverting structure 220A vertically and further rotating it 90 degrees clockwise or counterclockwise along a plane extending in the front-to-back and left-to-right directions. The fourth portion 42 of the second elastic member 40 of structure 220A and the fourth portion 42 of the second elastic member 40 of structure 220B are joined to each other. Similar to structure 20, structure 220 can suppress relatively large variations in surface pressure on external members at different positions when structure 220 deforms due to vertical pressure (up and down direction in Figure 10) on structure 220 from external members.

[0036] Figure 12 is a front view of a modified structure 320. The front-to-back, left-to-right, and up-to-down directions of structure 320 are as shown in Figure 12, but these are illustrative for explanatory purposes and do not limit the direction or orientation when implementing structure 320. As shown in Figure 12, structure 320 comprises structures 320A, 320B, 320C, and 320D. Structure 320A is the same as structure 20. Structure 320B is structure 120A inverted vertically. Structure 320C is structure 320B with the third elastic member 50 removed. Structure 320D is structure 320A with the third elastic member 50 removed. The structures 320 are arranged in the order of structures 320A, 320C, 320D, and 320B from top to bottom. The fourth portion 42 of the second elastic member 40 of structure 320A is joined to the fourth portion 42 of the second elastic member 40 of structure 320C, the first elastic member 30 of structure 320C is joined to the first elastic member 30 of structure 320D, and the fourth portion 42 of the second elastic member 40 of structure 320D is joined to the fourth portion 42 of the second elastic member 40 of structure 320B. Similar to structure 20, when structure 320 deforms due to a pressing force from an external member in the height direction (up and down direction in Figure 12) of structure 320, it is possible to suppress the relatively large variation in surface pressure on the external member at each position of structure 320. Note that the first elastic member 30 may be shared between structures 320C and 320D.

[0037] Furthermore, the correspondence between the main elements of the embodiment and the main elements of the invention described in the section on means for solving the problem is merely an example to specifically explain the form in which the embodiment implements the invention described in the section on means for solving the problem, and does not limit the elements of the invention described in the section on means for solving the problem. In other words, the interpretation of the invention described in the section on means for solving the problem should be based on the description in that section, and the embodiment is merely one specific example of the invention described in the section on means for solving the problem.

[0038] The above describes the forms for implementing this disclosure using embodiments, but this disclosure is not limited in any way to these embodiments, and can of course be implemented in various forms without departing from the gist of this disclosure.

[0039] [Note] [1] The first structure of the present disclosure comprises: a first elastic member having a plurality of first portions extending along a predetermined direction and spaced apart along the predetermined direction, and a second portion which is a portion between two adjacent first portions; and a second elastic member having a plurality of third portions extending in a curve along the predetermined direction and each joined to the first portions, and a fourth portion which is a portion between two adjacent third portions and is convex on the side away from the second portion, wherein the structure comprises a third elastic member which is joined to or in contact with a first predetermined surface of the first elastic member opposite to the second elastic member, and which has lower rigidity than the first and second elastic members, and the thickness of a sixth portion which is a portion between two fifth portions corresponding to the two first portions increases as it moves away from the two fifth portions.

[0040] The first structure of this disclosure comprises a third elastic member in addition to first and second elastic members. The third elastic member is bonded to or in contact with a first predetermined surface of the first elastic member opposite to the second elastic member, and has lower rigidity than the first and second elastic members, and the thickness of the sixth portion, which is the portion between two fifth portions corresponding to two first portions, increases as it moves away from the two fifth portions. This makes it possible to suppress relatively large variations in surface pressure on external members from one position to the other when the structure deforms due to pressing force from an external member.

[0041] [2] In the structure described above (the structure described in [1]), the first elastic member extends linearly along the predetermined direction, or is convex toward the sixth portion at the second portion, and the second predetermined surface of the third elastic member opposite to the first elastic member may be convex toward the side of the sixth portion that is separated from the second portion.

[0042] [3] In the structure described above (the structure described in [2]), the third elastic member may have rigidity such that when a pressing force is applied to the structure in the direction of the arrangement of the second, first, and third elastic members, the second portion is deformed into a convex shape toward the fourth portion, accompanied by deformation of the sixth portion.

[0043] [4] In the structure described above (the structure described in [3]), when a pressing force is applied in the direction of arrangement, the structure may deform so that the fourth portion approaches the second portion and the second portion deforms into a convex shape toward the fourth portion, thereby generating compressive stress in the second elastic member and tensile stress and stress toward the sixth portion in the first elastic member.

[0044] [5] In the structure described above (the structure described in [1]), the first elastic member is convex toward the fourth portion at the second portion, and the second predetermined surface of the third elastic member opposite to the first elastic member may extend linearly along the predetermined direction, or be convex toward the side away from the second portion at the sixth portion.

[0045] [6] In the structure described above (the structure described in [5]), when a pressing force is applied in the direction of arrangement of the second, first, and third elastic members, the structure may deform so that the fourth portion approaches the second portion, and the second portion is convex toward the fourth portion, thereby generating compressive stress in the second elastic member and tensile stress and stress toward the sixth portion in the first elastic member.

[0046] [7] In the above-described structure (the structure described in any one of [1] to [6]), the initial shapes of the first, second, and third elastic members may be determined such that the second portion does not come into contact with the fourth portion within the allowable displacement range in the direction of arrangement of the second, first, and third elastic members of the structure.

[0047] [8] In the above-described structure (the structure described in any one of [1] to [7]), the rigidity of the third elastic member may increase as the distance between the sixth portion and the two fifth portions increases.

[0048] [9] The second structure of the present disclosure comprises a first elastic member having a plurality of first portions extending along a predetermined direction and spaced apart along the predetermined direction, and a second portion which is a portion between two adjacent first portions; and a second elastic member having a plurality of third portions extending in a curve along the predetermined direction and each joined to the first portions, and a fourth portion which is a portion between two adjacent third portions and is convex toward the side away from the second portion, wherein the structure comprises a third elastic member which is joined to or in contact with a first predetermined surface of the first elastic member opposite to the second elastic member, and which has lower rigidity than the first and second elastic members, and the rigidity of a sixth portion which is a portion between two fifth portions corresponding to the two first portions increases as it moves away from the two fifth portions.

[0049] The second structure of this disclosure comprises a third elastic member in addition to the first and second elastic members. The third elastic member is bonded to or in contact with a first predetermined surface of the first elastic member opposite to the second elastic member, and has lower rigidity than the first and second elastic members, and the rigidity of the sixth part, which is the portion between two fifth parts corresponding to two first parts, increases as it moves away from the two fifth parts. This makes it possible to suppress relatively large variations in surface pressure on external members from one position to the other when the structure deforms due to pressing force from an external member. [Explanation of symbols]

[0050] 20,120,220,320 Structure, 30 First elastic member, 31 First part, 32 Second part, 40 Second elastic member, 41 Third part, 42 Fourth part, 50 Third elastic member, 51 Fifth part, 52 Sixth part.

Claims

1. A first elastic member having a plurality of first portions extending along a predetermined direction and spaced apart along the predetermined direction, and a second portion which is the portion between two adjacent first portions, A second elastic member having a plurality of third portions that extend in a curved shape along the predetermined direction and are joined to the first portion, and a fourth portion that is convex on the side separated from the second portion, between two adjacent third portions, A structure comprising, A third elastic member is bonded to or in contact with a first predetermined surface of the first elastic member opposite to the second elastic member, and has lower rigidity than the first and second elastic members, and the thickness of the sixth portion, which is the portion between the two fifth portions corresponding to the two first portions, increases as it moves away from the two fifth portions. A structure that includes the following features.

2. The structure according to claim 1, The first elastic member extends linearly along the predetermined direction, or has a convex shape towards the sixth portion at the second portion. The second predetermined surface of the third elastic member opposite to the first elastic member is convex in the direction that separates it from the second portion at the sixth portion. structure.

3. The structure according to claim 2, The third elastic member has rigidity such that when a pressing force is applied to the structure in the direction of the arrangement of the second, first, and third elastic members, the second portion is deformed into a convex shape toward the fourth portion, accompanied by deformation of the sixth portion. structure.

4. The structure according to claim 3, When a pressing force is applied in the direction of arrangement, the structure deforms such that the fourth portion approaches the second portion and the second portion deforms into a convex shape toward the fourth portion, thereby generating compressive stress in the second elastic member and tensile stress and stress toward the sixth portion in the first elastic member. structure.

5. The structure according to claim 1, The first elastic member has a convex shape towards the fourth portion at the second portion, The second predetermined surface of the third elastic member opposite to the first elastic member extends linearly along the predetermined direction, or is convex on the side that separates from the second portion at the sixth portion. structure.

6. The structure according to claim 5, When a pressing force is applied in the direction of arrangement of the second, first, and third elastic members, the structure deforms so that the fourth portion approaches the second portion, and because the second portion is convex toward the fourth portion, compressive stress is generated in the second elastic member, and tensile stress and stress toward the sixth portion are generated in the first elastic member. structure.

7. A structure according to any one of claims 1 to 6, The initial shapes of the first, second, and third elastic members are determined such that the second portion does not come into contact with the fourth portion within the allowable displacement range in the direction of arrangement of the second, first, and third elastic members of the structure. structure.

8. A structure according to any one of claims 1 to 6, The rigidity of the third elastic member increases as the distance between the sixth portion and the two fifth portions increases. structure.

9. A first elastic member having a plurality of first portions extending along a predetermined direction and spaced apart along the predetermined direction, and a second portion which is the portion between two adjacent first portions, A second elastic member having a plurality of third portions that extend in a curved shape along the predetermined direction and are joined to the first portion, and a fourth portion that is convex on the side separated from the second portion, between two adjacent third portions, A structure comprising, A third elastic member is bonded to or in contact with a first predetermined surface of the first elastic member opposite to the second elastic member, and has lower rigidity than the first and second elastic members, and the rigidity of the sixth portion, which is the portion between the two fifth portions corresponding to the two first portions, increases as it moves away from the two fifth portions. A structure that includes the following features.

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