cushion

Abstract

A cushion is provided that can be easily compacted and assembled into chairs or the like. The cushion (10) having a seat surface (11) and a backrest (12) has a plurality of pockets (20) that can be inflated by filling with fluid. In the inflated state of the pockets (20), the cushion (10) is folded at the boundary (13) between the seat surface (11) and the backrest (12).

Description

Technical Field

[0001] This invention relates to a seat cushion. Background Technology

[0002] Conventionally, seat cushions having a seat surface and a backrest are known. For example, the seat cushion described in Patent Document 1 below is used on a chair or sofa. The seat surface and backrest of this seat cushion have multiple cushioning portions filled with cushioning material. The cushioning portions are held integrally by a fabric. When not in use, the seat cushion can be rolled up to become compact. The seat cushion has a front drooping portion and a rear drooping portion to maintain a shape that follows the shape of a chair or the like. The front drooping portion droops down on the front side of the seat surface of a chair or the like, keeping the seat surface along the seat surface. The rear drooping portion droops down on the rear side of the backrest of a chair or the like, keeping the backrest along the front surface of the backrest.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Utility Model Registration No. 3194682

[0006] The technical problem that the invention aims to solve

[0007] However, when assembling a cushion with such a structure onto a chair or similar object, the following steps are required: the front drooping portion hangs down on the front side of the seat surface of the chair or similar object; the seat surface is placed on the seat surface of the chair or similar object; the backrest hangs along the front surface of the backrest of the chair or similar object; and the rear drooping portion hangs down on the rear side of the backrest. Therefore, it can be easily made compact, but there is a problem that it cannot be easily assembled onto a chair or similar object. Summary of the Invention

[0008] The present invention was made in view of the above circumstances, and its object is to provide a cushion that can be easily compacted and easily assembled into chairs and the like.

[0009] Technical means for solving technical problems

[0010] The cushion of the present invention is a cushion having a seat surface and a backrest, and having a plurality of bags that can expand by being filled with fluid. In the expanded state of the bags, the cushion is in a shape that is bent at the boundary between the seat surface and the backrest.

[0011] The effects of the invention

[0012] According to the present invention, by draining fluid from the bag, the cushion can be easily made compact. By filling the bag with fluid, the cushion takes on a shape that bends at the boundary between the seat and the backrest. The cushion with the bend at the boundary between the seat and the backrest can be assembled to a chair or the like simply by placing it. Therefore, it can be easily made compact and easily assembled to a chair or the like. Attached Figure Description

[0013] Figure 1 This is a perspective view showing the seat cushion of this embodiment and its assembly on a chair.

[0014] Figure 2 This is a top view showing a flat seat cushion.

[0015] Figure 3 This is a top view showing a legless, chair-like cushion.

[0016] Figure 4 This is a front view showing a legless, chair-like cushion.

[0017] Figure 5 This is a rear view of a legless, chair-like cushion.

[0018] Figure 6 This is a side view of a legless, chair-like cushion.

[0019] Symbol Explanation

[0020] 10...seat cushion

[0021] 11...seat face

[0022] 12...backrest

[0023] 13...Boundary section

[0024] 16... Surface components

[0025] 17... Rear Parts

[0026] 20...bag body

[0027] 21...First bag

[0028] 22...Second bag

[0029] 23... Third sac

[0030] 40...the side edge of the seat

[0031] 41...the edge of the backrest side Detailed Implementation

[0032] The preferred embodiments of the present invention will be described below.

[0033] In the cushion of the present invention, the plurality of pockets may also include a pair of first pockets located at the left and right ends of the boundary portion. Each first pocket has an edge on the seat surface side and an edge on the backrest side, extending in a direction from the left and right ends of the boundary portion toward the center. With this structure, by filling the pair of first pockets with fluid, the seat surface and backrest automatically fold at the boundary portion. Therefore, the cushion can easily be made into a legless chair shape.

[0034] Alternatively, the cushion of the present invention may also include a surface component and a back component, wherein the elastic force of the surface component is greater than that of the back component. With this structure, by filling the bag with fluid, the surface component and the back component elastically elongate. The cushion folds with the surface component on the inside and the back component on the outside due to the elastic force of the surface component. Therefore, it is easy to position the surface component on the side that the sitter contacts and the back component on the side opposite to the sitter's contact.

[0035] Alternatively, in the seat cushion of the present invention, the left and right ends of the backrest can be raised forward when the bag body is inflated. With this structure, the left and right edges of the backrest can support the back of the seated person from both sides. Therefore, the seated person's posture can be easily stabilized.

[0036] Alternatively, in the seat cushion of the present invention, the left and right ends of the seat surface can be raised upwards when the bag body is inflated. With this structure, the left and right edges of the seat surface can support the buttocks of the sitter from both sides. Therefore, the sitter's posture can be easily stabilized.

[0037] Alternatively, in the seat cushion of the present invention, the plurality of pockets may include a second pocket and a third pocket disposed on the seat surface. The second pocket is located at the rear edge of the seat surface, and the third pocket is located at the front side compared to the second pocket. In the inflated state of the pockets, the upward protrusion of the second pocket is larger than the upward protrusion of the third pocket. With this structure, the second pocket of the seat surface can easily support the pelvis of the seated person from the rear and lower side. Therefore, it is easy to keep the pelvis of the seated person in an upright position.

[0038] <Example>

[0039] The following is for reference Figures 1-6 A specific embodiment of the present invention will be described in detail below. The cushion 10 of this embodiment includes a plurality of pockets 20, which expand and contract by the inflow and outflow of air. By filling the pockets 20 with air, the pockets 20 become inflated.

[0040] like Figure 1 As shown, the seat cushion 10, with air filled into the bag 20, is assembled into the chair 100 for use. The chair 100 is a seat for buses, Shinkansen bullet trains, etc. The chair 100 has a seat 101, a backrest 102, and left and right armrests 103. Furthermore, Figure 1 Only the armrest 103 on one side is shown so that the shape of the seat cushion 10 can be easily seen.

[0041] The following will describe the various structural components. Figure 1 The positive direction of the X-axis is set as the front side, and the positive direction of the X-axis is set as the front side. Figure 1 The negative direction of the X-axis is set as the rear side, and... Figure 1 The positive direction of the Y-axis is set to the top. Figure 1 The negative direction of the Y-axis is set to the bottom. Figure 1 The positive Z-axis direction (facing the seat cushion 10 in the state of being assembled with the chair 100) is set to the right side and... Figure 1 The negative Z-axis side (the side facing the seat cushion 10 assembled in the chair 100) will be described as the left side. Furthermore, the side facing the occupant's waist and hips will be described as the front side, and the opposite side as the back side.

[0042] The seat cushion 10 has a seat surface 11 and a backrest 12. In the inflated state of the bag body 20, the seat cushion 10 is folded at the boundary 13 between the seat surface 11 and the backrest 12. This folded shape at the boundary 13 is referred to as a legless chair. A legless chair is a chair used for sitting, with no legs, but rather a seat surface (the surface that the buttocks contact) and a backrest as its basic structure. The seat surface 11 rests on the seat surface 101 of the chair 100. The backrest 12 is positioned at the front of the backrest 102 of the chair 100. When assembled in the chair 100, the seat cushion 10 is stored between the left and right armrests 103. The front end of the seat surface 11 is located rearward compared to the front end of the seat surface 101. The backrest 12 is located at the lower end of the backrest 102. The upper end of the backrest 12 is at the same height as the armrests 103. The boundary 13 is located at the rear end of the seat surface 101.

[0043] The seat cushion 10 is covered by a cover component (not shown). The cover component is in the shape of a bag that accommodates the seat cushion 10. The cover component is removable from the seat cushion 10.

[0044] Each bag 20 is formed by dividing the surface part 16 and the back part 17 (described later) by a fixing part 18. Each bag 20 has a vent 15. The bag 20 in the inflated state has cushioning properties. The thickness (dimension in the front and back direction) and rigidity of the bag 20 in the inflated state can be adjusted by adjusting the internal pressure of the bag 20. The bag 20 in the inflated state supports the waist and buttocks of the seated person in a proper position.

[0045] Air is expelled from the bag body 20, causing the bag body 20 to retract. In the retracted state of the bag body 20, the seat cushion 10 becomes flat (see reference). Figure 2 The flat seat cushion 10 is referred to as seat cushion sheet 10S. The thickness of seat cushion sheet 10S is the same as the thickness of the overlapping surface member 16 and back member 17, which will be described later. In seat cushion sheet 10S, the entire surfaces of surface member 16 and back member 17 are in near contact. Seat cushion sheet 10S is easily deformable. Seat cushion sheet 10S can be rolled up or folded to become compact, for example.

[0046] The legless, chair-like cushion 10 is bent at the boundary 13 between the seat surface 11 and the backrest 12. The angle between the outer surfaces of the seat surface 11 and the backrest 12 is less than 180 degrees (approximately 120 to 140 degrees). The legless, chair-like cushion 10 becomes curved along the curve of the human body when the person sits on it.

[0047] The seat cushion 10 includes a surface component 16 and a back component 17. The surface component 16 forms the entire surface (the side facing the occupant's lower back and buttocks). The back component 17 forms the entire back surface (the side facing the chair 100). The surface component 16 forms the front side of the pocket 20. The back component 17 forms the back side of the pocket 20. Air is contained between the surface component 16 and the back component 17. The back component 17 includes an anti-slip element.

[0048] Both the surface component 16 and the back component 17 are sheet materials. The surface component 16 and the back component 17 have the same shape. The area of ​​the surface component 16 and the back component 17 are equal. The surface component 16 and the back component 17 are partially fixed and integrated. Fixing is achieved through welding. The surface component 16 and the back component 17 are divided into multiple bag bodies 20 by a fixing portion 18 that fixes the surface component 16 and the back component 17.

[0049] The elastic force of the surface component 16 is greater than that of the back component 17. The surface component 16 and the back component 17 are formed, for example, by laminating elastomer layers onto a fabric. The elastomer layers can be fused together at the fixing portion 18, for example. The fabric material for the surface component 16 can be, for example, polyester, polyurethane, nylon, etc. The fabric material for the back component 17 can be, for example, cotton, etc. The elastomer layer can be, for example, a polyurethane-based thermoplastic elastomer (TPU).

[0050] like Figure 1As shown, the plurality of pockets 20 include a first pocket 21, a second pocket 22, a third pocket 23, a fourth pocket 24, a fifth pocket 25, a sixth pocket 26, and a seventh pocket 27. The first pocket 21 is located at the boundary portion 13. The second pocket 22, the third pocket 23, and the fourth pocket 24 are located at the seat surface 11. The fifth pocket 25, the sixth pocket 26, and the seventh pocket 27 are located at the backrest 12. The pockets 20 will be described in detail later.

[0051] like Figure 2 As shown, the seat cushion sheet 10S is symmetrical about its center in the left-right direction. The backrest 12 and the seat surface 11 of the seat cushion sheet 10S are arranged on the same plane. The length from the second boundary fixing part 38B (described later) to the rear end of the seat cushion sheet 10S is smaller than the length from the second boundary fixing part 38B (described later) to the front end of the seat cushion sheet 10S.

[0052] The outer edge 30 of the cushion sheet 10S is curved. The outer edge 30 of the cushion sheet 10S has a rear edge 32, left and right side edges 33 and a front edge 34.

[0053] The rear edge 32 of the cushion sheet 10S has two rear edge protrusions 32A and one rear edge recess 32B. The rear edge recess 32B is located between the rear edge protrusions 32A. The left and right ends of the rear edge 32 of the cushion sheet 10S extend rearward compared to the central portion. By providing the rear edge recess 32B, the left and right sides of the cushion sheet 10S (the portions with the rear edge protrusions 32A) can easily bend with the front end (the most recessed part) of the rear edge recess 32B as a reference point.

[0054] The side edges 33 of the cushion sheet 10S have three side edge protrusions 33A and two side edge recesses 33B. Each side edge recess 33B is located between the side edge protrusions 33A. By providing the side edge recesses 33B, the front and rear portions of the side edge recesses 33B (the portions where the side edge protrusions 33A are provided) can easily bend with the side edge recesses 33B as a base point. The side edge protrusion 33A located at the center in the front-rear direction of the three side edge protrusions 33A extends to the left and right compared to the front and rear side edge protrusions 33A.

[0055] The front edge 34 of the cushion sheet 10S has two front edge protrusions 34A and one front edge recess 34B. The front edge recess 34B is located between the front edge protrusions 34A. The left and right ends of the front edge 34 of the cushion sheet 10S extend forward compared to the central portion.

[0056] The four corners 31 of the cushion sheet 10S are rounded. The radius of the front corner 31 of the cushion sheet 10S is larger than the radius of the rear corner 31 of the cushion sheet 10S.

[0057] The fixing part 18 has an outer edge fixing part 35, a seat fixing part 36, a backrest fixing part 37, and a boundary fixing part 38. The outer edge fixing part 35 extends along the entire circumference of the outer edge 30 of the seat cushion sheet 10S.

[0058] A seat fixing portion 36 extends in the front-to-back direction. The front end of the seat fixing portion 36 is connected to the outer edge fixing portion 35. Multiple seat fixing portions 36 are arranged in the left-to-right direction. A third pocket 23 is formed between adjacent left and right seat fixing portions 36. The third pocket 23 is elongated in the front-to-back direction. Multiple third pockets 23 are provided. The multiple third pockets 23 are arranged in the left-to-right direction. A fourth pocket 24 is formed between the seat fixing portion 36 located at the left and right ends of the multiple seat fixing portions 36 and the outer edge fixing portion 35. The fourth pocket 24 is provided at the left and right ends of the seat surface 11. The left-to-right dimension of the fourth pocket 24 is larger than the left-to-right dimension of the third pocket 23. A vent 15 is formed at the midway point in the extension direction of the seat fixing portion 36. The vent 15 connects adjacent third pockets 23 to each other, or connects the third pocket 23 and the fourth pocket 24.

[0059] The backrest fixing part 37 has a first backrest fixing part 37A and a second backrest fixing part 37B. The first backrest fixing part 37A is curved in the front-back direction and extends in the left-right direction. When viewed from above in the seat cushion sheet 10S, the first backrest fixing part 37A has a shape that extends from back to front in the left-right direction. The central part of the first backrest fixing part 37A in the left-right direction is close to the outer edge fixing part 35 of the rear edge recess 32B. A sixth pocket 26 is formed on the front side of the first backrest fixing part 37A. A seventh pocket 27 is formed on the rear side of the first backrest fixing part 37A. The seventh pocket 27 is disposed between the left and right fifth pockets 25. The seventh pocket 27 has a structure that is longer in the front-back direction and a triangular structure. A vent 15 is formed at the rear end of the first backrest fixing part 37A, which connects the sixth pocket 26 and the seventh pocket 27.

[0060] The second backrest fixing part 37B extends in the front-to-back direction. The front end of the second backrest fixing part 37B is connected to the first backrest fixing part 37A. A plurality of second backrest fixing parts 37B are arranged in the left-to-right direction. A fifth pocket 25 is formed between the second backrest fixing parts 37B located at the left and right ends of the plurality of second backrest fixing parts 37B and the outer edge fixing part 35 of the corner part 31. The fifth pocket 25 is provided at the left and right ends of the backrest 12. A vent 15 is formed in the second backrest fixing part 37B, which connects adjacent seventh pockets 27 to each other or connects the seventh pocket 27 and the fifth pocket 25.

[0061] The boundary fixing portion 38 has a first boundary fixing portion 38A and a second boundary fixing portion 38B. A pair of first boundary fixing portions 38A are provided at the front and rear ends of both the left and right ends of the boundary portion 13. The first boundary fixing portions 38A are connected to the outer edge fixing portion 35 of the side edge recess 33B. A first bag body 21 is formed inside the pair of front and rear first boundary fixing portions 38A. The front first boundary fixing portion 38A forms the edge 40 on the seat surface 11 side of the first bag body 21. The rear first boundary fixing portion 38A forms the edge 41 on the backrest 12 side of the first bag body 21.

[0062] The first bag 21 is triangular in shape. The first bag 21 is positioned between the fourth bag 24 and the fifth bag 25. The edge 40 on the seat surface 11 side and the edge 41 on the backrest 12 side extend in a direction approaching the center from both ends of the boundary portion 13 in the left-right direction. A vent 15 is formed between the top of the edge 40 on the seat surface 11 side and the top of the edge 41 on the backrest 12 side.

[0063] The second boundary fixing portion 38B extends linearly in the left-right direction. The front-back positions of the left and right ends of the second boundary fixing portion 38B are between the front and rear pairs of first boundary fixing portions 38A. A second pocket 22 is formed between the second boundary fixing portion 38B and the rear end of the seat fixing portion 36. The second pocket 22 is located at the center of the rear edge of the seat surface 11 in the left-right direction. The second pocket 22 extends relatively long in the left-right direction. The left-right length dimension of the second pocket 22 is larger than its front-back length dimension. The front-back dimension of the center of the second pocket 22 in the left-right direction is larger than the front-back dimension of the two ends of the second pocket 22 in the left-right direction.

[0064] A sixth pocket 26 is formed between the second boundary fixing part 38B and the first backrest fixing part 37A. The sixth pocket 26 is located at the center of the backrest 12 in the left-right direction. The sixth pocket 26 is triangular in shape.

[0065] The cushion 10 includes a pump 42 and a stopper 43. The pump 42 and stopper 43 are located in the bag body 20. The pump 42 is located in the first bag body 21 on the left side. The stopper 43 is located in the first bag body 21 on the right side. The pump 42 and stopper 43 are fixed to the surface component 16. The pump 42 delivers gas into the bag body 20 by pressing. The bag body 20 without the pump 42 is connected to the pump 42 via a vent 15. Air is supplied to the entire bag body 20 by one pump 42. The stopper 43 closes the vent to prevent air from escaping from the bag body 20. By opening the stopper 43, air can leak from the bag body 20.

[0066] Next, the shape of the cushion 10, which is formed by filling the bag 20 with air and becoming a legless chair-like shape, will be described. Figure 1As shown, the left and right ends of the back 12 stand forward. The fifth pouch 25 is more inflated than the seventh pouch 27. The surface of the fifth pouch 25 is in front compared to the surface of the seventh pouch 27. The left end of the left fifth pouch 25 is in front compared to its right end. The right end of the right fifth pouch 25 is in front compared to its left end. The surface of the fifth pouch 25 faces diagonally inward (towards the center in the left and right directions). The surface of the sixth pouch 26 is in front compared to the surface of the seventh pouch 27. The first pouch 21 stands upright. The surface of the first pouch 21 faces inward in the left and right directions. The upward protrusion of the second pouch 22 is larger than the upward protrusion of the third pouch 23.

[0067] Next, the shape of the legless, chair-like cushion 10, viewed from above, will be described. For example... Figure 3 As shown, the lateral dimension of the seat cushion 10 decreases from the rear to the front. The lateral dimension of the seat cushion 10 is smaller than the lateral dimension of the seat cushion sheet 10S. The outer edge 30 of the seat cushion 10 has creases in multiple locations.

[0068] Next, the shape of the legless, chair-like cushion 10, as observed from the main viewpoint, will be explained. For example... Figure 4 As shown, the vertical dimension of the seat cushion 10 is smaller than its horizontal dimension. The horizontal dimension of the seat cushion 10 increases from the top to the bottom. The backrest 12, the left and right first pockets 21, and the left and right fourth pockets 24 rise upward relative to the central area of ​​the seat surface 11. The backrest 12, the left and right first pockets 21, and the left and right fourth pockets 24 form a wall surrounding the central area of ​​the seat surface 11. The rear corner 31 of the seat cushion 10 protrudes upward relative to the left and right first pockets 21. The height dimension decreases sequentially from the rear corner 31 toward the rear edge recess 32B.

[0069] The two ends of the seat surface 11 rise upwards in the left and right directions. The fourth pocket 24 rises upwards relative to the third pocket 23. The fourth pocket 24 and the third pocket 23 are bent at the junction of the seat surface fixing part 36. The surface of the fourth pocket 24 faces obliquely inward (towards the center in the left and right direction). The front edge 34 of the seat surface 11 is curved in an arc shape with the center of the left and right direction above the end side.

[0070] Next, the shape of the legless, chair-like seat cushion 10, as viewed from the rear, will be explained. For example... Figure 5 As shown, the back of the first bag 21 slopes outward from the bottom to the top and then to the left and right. The lower surface of the second bag 22 extends approximately horizontally.

[0071] Next, the shape of the legless, chair-like cushion 10, viewed from the side, will be described. For example... Figure 6As shown, the side edge 33 of the seat cushion 10 extends upward from the front corner 31 toward the rear corner 31. The rear corner 31 is positioned at the highest point. The back of the seat cushion 10 is bent at the boundary 13. The back of the backrest 12 slopes upward toward the rear. The back of the backrest 12 forms an angle less than 180 degrees (approximately 120 to 140 degrees) with the back of the seat surface 11. The back of the sixth pocket 26 protrudes toward the back compared to the back of the fifth pocket 25.

[0072] Next, an example of using the seat cushion 10 will be described. First, the bag 20 is inflated. Air is injected into the bag 20 by pressing the pump 42. Each press of the pump 42 injects air into the bag 20. As the bag 20 inflates, the first bag 21, the fifth bag 25, and the fourth bag 24 stand upright towards the center in the left-right direction. The seventh bag 27 and the fifth bag 25 bend forward and towards the center in the left-right direction, with the first backrest fixing part 37A as a base point. The left and right sides of the backrest 12 can easily bend forward by providing the rear edge recess 32B. The fifth bag 25 and the fourth bag 24 shift towards each other with the first boundary fixing part 38A as a base point. The backrest 12 and the seat surface 11 can easily bend by providing the side edge recess 33B. The backrest 12 and the seat surface 11 bend at the boundary part 13. Thus, the seat cushion 10 naturally bends into a legless chair shape. At this time, the surface component 16 is on the inside, and the back component 17 is on the outside. Adjust the amount of air inside the bag body 20 to adjust the stiffness of the bag body 20. If the stiffness is insufficient, press the pump 42 to send air into the bag body 20. If the bag body 20 is too stiff, open the stopper 43 to release air from the bag body 20.

[0073] Next, the legless, chair-like seat cushion 10 is assembled onto the chair 100. Assembling the seat cushion 10 onto the chair 100 is simply done by placing the seat cushion 10 on the seat surface 101. The seat cushion 10 is held on the chair 100 in an appropriate posture.

[0074] Next, the person sits on the seat cushion 10. The second pocket 22 supports the lower part of the sacrum from below. This keeps the pelvis upright. The left and right fifth pockets 25 support the left and right sides of the sitter's lower back from behind. The first backrest fixing part 37A suppresses rapid air movement in the left and right directions of the backrest 12, thus stably supporting the sitter's lower back. Furthermore, since the backrest 12 is fixed by the easily bending part of the first backrest fixing part 37A, differences in user experience caused by variations in the chair's surface shape or misalignment of the seat cushion 10 when placed on the chair are eliminated. The left and right fourth pockets 24 support the left and right sides of the sitter's buttocks from below. This keeps the sitter's lower back and buttocks in a correct posture. The third pocket 23 extends along the direction of the sitter's feet. Multiple third pockets 23 are provided. This disperses body pressure (pressure transmitted from the seat surface 11 to the buttocks and thighs), improving the sitter's sitting comfort.

[0075] When the use of the cushion 10 is finished, the stopper 43 is opened to release air from the bag 20. This allows the bag 20 to be easily flattened. By flattening the bag 20, the cushion 10 becomes a sheet. The cushion sheet 10S can be easily bent and rolled up to become compact. The compact cushion sheet 10S can be easily carried or stored.

[0076] Next, the function and effects of the embodiment configured as described above will be explained. The seat cushion 10 of this embodiment has a seat surface 11 and a backrest 12. The seat cushion 10 has a plurality of pockets 20 that can expand by the insertion of air. When the pockets 20 are inflated, the seat cushion 10 is shaped to bend at the boundary 13 between the seat surface 11 and the backrest 12.

[0077] According to this structure, by expelling air from the bag 20, the cushion 10 can be easily made compact. By filling the bag 20 with fluid, the cushion 10 becomes a legless chair shape. The legless chair shape of the cushion 10 can be assembled to a chair 100 or the like simply by placing it. Therefore, the cushion 10 can be easily made compact and easily assembled to a chair 100 or the like.

[0078] The plurality of pockets 20 each has a pair of first pockets 21 located at the left and right ends of the boundary portion 13. Each first pocket 21 has an edge 40 on the side of the seat 11 and an edge 41 on the side of the backrest 12. The edge 40 on the seat 11 side and the edge 41 on the backrest 12 side extend in a direction approaching the center from the left and right ends of the boundary portion 13. According to this structure, by filling the pair of first pockets 21 with air, the seat 11 and backrest 12 automatically fold at the boundary portion 13. Therefore, the cushion 10 can be easily transformed into a legless chair shape.

[0079] The seat cushion 10 includes a surface member 16 and a back member 17. The elastic force of the surface member 16 is greater than that of the back member 17. According to this structure, by introducing air into the bag body 20, the surface member 16 and the back member 17 are elastically stretched. The seat cushion 10 is bent with the surface member 16 as the inside and the back member 17 as the outside due to the elastic force of the surface member 16. Therefore, it is easy to position the surface member 16 on the side that the sitter contacts and the back member 17 on the side opposite to the sitter's contact.

[0080] With the bag body 20 in its inflated state, the left and right ends of the backrest 12 stand upright towards the front. According to this structure, the left and right edges of the backrest 12 can support the back of the seated person from both sides. Therefore, the seated person's posture can be easily stabilized.

[0081] When the bag body 20 is inflated, the left and right ends of the seat surface 11 stand upright. With this structure, the left and right edges of the seat surface 11 can support the buttocks of the person sitting on it from both sides. Therefore, the posture of the person sitting on it can be easily stabilized.

[0082] The multiple pockets 20 include a second pocket 22 and a third pocket 23 disposed on the seat surface 11. The second pocket 22 is located at the rear edge of the seat surface 11. The third pocket 23 is located at the front side compared to the second pocket 22. In the inflated state of the pockets 20, the upward protrusion of the second pocket 22 is larger than the upward protrusion of the third pocket 23. According to this structure, the second pocket 22 of the seat surface 11 can easily support the pelvis of the seated person from the rear and lower side. Therefore, it is easy to keep the pelvis of the seated person in an upright position.

[0083] <Other Embodiments>

[0084] The present invention is not limited to the embodiments described above and in the accompanying drawings. For example, the following embodiments are also included within the scope of the present invention.

[0085] (1) In the above embodiment, the example is that the cushion 10 is assembled onto the chair 100 for use. It is not limited to this, and the cushion may also be placed on the floor of a room, on a sofa, etc.

[0086] (2) The chair 100 in the above embodiment is a seat for buses, Shinkansen, etc. It is not limited to this, and the chair may also be a seat for stadiums, etc.

[0087] (3) In the above embodiments, the specific structure (size, shape, and number, etc.) of the bag body 20 is illustrated. It is not limited thereto, and the structure of the bag body can be changed.

[0088] (4) In the above embodiment, the pump 42 is disposed on the first bag body 20. However, it is not limited to this and the position of the pump can be changed.

[0089] (5) In the above embodiment, the pump 42 is disposed on the surface of the seat cushion 10. It is not limited thereto, and the pump may also be disposed on the back of the seat cushion.

[0090] (6) In the above embodiment, one pump 42 is provided. It is not limited to this, and two or more pumps may also be provided.

[0091] (7) In the above embodiment, air enters and exits the bag body 20. It is not limited to this, and gas, liquid, beads, etc. may also enter and exit the bag body.

[0092] (8) In the above embodiments, fixation is performed by welding. However, it is not limited to this; fixation can also be performed by other methods such as bonding.

[0093] (9) In the above embodiment, pump 42 is a hand pump. It is not limited to this; the pump may also utilize an electric fan structure or be an integral part of the valve. Alternatively, the pump may be an air pump separate from the main body.

[0094] (10) In the above embodiment, the surface and back of the cushion 10 are formed by the surface member 16 and the back member 17. This is not a limitation; the cushion may also be formed by folding, for example, a single sheet of material. Alternatively, the cushion may be formed by a seamless structure, such as that of a balloon (like an air cushion manufactured by blow molding). In this case, multiple pockets may be formed by partially fixing the opposing surfaces of the surface and back to each other.

[0095] (11) In the above embodiment, each bag body 20 is formed by dividing the surface part 16 and the back part 17 by the fixing part 18. It is not limited to this, and the bags can also be manufactured separately and these bags can be connected to form a cushion. As a connection method, for example, each bag body can be fixed or multiple bags can be fixed together on a blank.

Claims

1. A seat cushion having a seat surface and a backrest, characterized in that, It has multiple bags that can expand when filled with fluid. When the bag is inflated, the seat cushion is folded at the boundary between the seat surface and the backrest. The plurality of bags includes a pair of first bags located at the left and right ends of the boundary portion. The first bag body has an edge on the seat side and an edge on the backrest side. The edges of the seat and the backrest extend in a direction from the left and right ends of the boundary portion toward the center.

2. The seat cushion as described in claim 1, characterized in that, It has surface parts and back parts. The elastic force of the surface component is greater than that of the back component.

3. The seat cushion as described in claim 1 or 2, characterized in that, When the bag is inflated, the left and right ends facing the back stand up towards the front.

4. The seat cushion as described in claim 1 or 2, characterized in that, When the bag body is inflated, the left and right ends of the seat face rise upwards.

5. The seat cushion as described in claim 1 or 2, characterized in that, The plurality of bags includes a second bag and a third bag disposed on the seat surface. The second bag body is located at the rear edge of the seat surface. The third bag is located in front of the second bag. In the inflated state of the bag, the upward protrusion of the second bag is greater than the upward protrusion of the third bag.

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