chair

Abstract

In chairs with a mesh seat or backrest, the cushioning and fit are improved. [Solution] The seat 2 and backrest 3 of the chair have a structure in which mesh material 8 and 11 are stretched over support frame members 7 and 10, and cushioning materials 20 and 27 made of knitted fabric are attached to the seat 2 and backrest 3. The seat cushioning material 20 is composed of a bumpy structure 21 having many ridged parts 23 and a holding part 22 connected around the periphery of the bumpy structure 21. The ridged parts 23 of the bumpy structure 21 are knitted using a rib knit, and because it is thick, it can improve fit and cushioning. The back cushioning material 27 has an upholstered structure without bumps, but it is also possible to form it into a bumpy structure having ridged parts 23.

Description

Technical Field

[0001] The present invention relates to a chair that uses a flexible thin material such as a mesh material as an element for supporting a user's load (body pressure).

Background Art

[0002] Chairs are known in which a mesh material is used as an element (pressure receiving member) that supports the user's load (body pressure) on the seat or backrest (for example, Patent Document 1). The mesh material is generally stretched over a frame member having a loop structure, and has advantages such as excellent air permeability, and is widely applied to chairs ranging from those with complex structures such as swivel chairs to those with simple structures such as pipe chairs.

[0003] Looking at the arrangement modes of the mesh material, they are roughly classified into those in which both the seat and the backrest are of mesh specification, those in which only the backrest is of mesh material specification, and those in which only the seat is of mesh specification.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0005] Now, one of the features of the mesh material is excellent air permeability, and as described above, it is frequently used even in chairs with a simple structure called pipe chairs, but there is a problem that the cushioning property and fitting property are not necessarily good.

[0006] In other words, many chairs use urethane (foamed urethane material) in the inner shell of the seat and backrest. In this case, urethane deforms to conform to the contours of the body, resulting in excellent fit. However, mesh material simply expands and deforms significantly under the user's body pressure, resulting in poor fit. Furthermore, mesh material uses highly elastic threads to ensure strength, and its elasticity is worse than urethane, so its cushioning is also not very good.

[0007] In the case of a backrest, the amount of body pressure (load) is not very strong, and the load tends to be evenly distributed over a wide area, so even with a mesh design, there are not many problems with cushioning or fit. However, in the case of a seat, the amount of body pressure is large, and the load is concentrated on a small area of ​​the mesh material, so problems with fit and cushioning become more pronounced.

[0008] While some seat and backrest structures use resin plates to support body pressure and incorporate numerous small holes or slits to provide flexibility, or utilize elastomer materials to achieve flexibility, these materials, like mesh materials, cannot deform to conform to the user's body, resulting in the same problems with fit and cushioning.

[0009] The present invention was made against this backdrop, and aims to provide cushioning and a good fit to support elements (pressure-receiving members) such as seats, while using thin materials such as mesh or resin plates. [Means for solving the problem]

[0010] The present invention includes various configurations, examples of which are specified in each claim. Of these, the invention of claim 1 is: "It has a support element that supports the user's body, and the support element comprises a support surface member that receives body pressure, which is the pressing force of the user's body, and a rigid support frame member to which the periphery of the support surface member is fixed." The support surface member is made of woven fabric, knitted fabric, resin plate, or other flexible thin material, and is permitted to stretch and deform due to the user's body pressure. In this basic configuration, "A cushioning material made of knitted fabric, having an uneven structure in which three-dimensionally raised ridges and thin valleys are arranged alternately, is placed on at least a portion of the support surface member that comes into contact with the user's body." It possesses the following characteristics.

[0011] The invention of claim 2 is an extension of claim 1, "The cushioning material covers the entire surface of the support surface member." It possesses the following characteristics.

[0012] The invention of claim 3 is an extension of claim 1 or 2, The support frame member has the characteristic of having a frame structure that opens in the front-back direction of the support surface member.

[0013] The invention of claim 4 is an extension of claim 2, "A holding portion is formed around the entire circumference of the cushioning material, which is wrapped around the back side of the support frame member, and this holding portion is thinner than the ridged portion." It possesses the following characteristics.

[0014] The invention of claim 5 is also an extension of claim 2, "The cushioning material is formed in a horizontal stripe pattern in which the group of ridges is elongated in the left-right direction across the user's body, or in a vertical stripe pattern in which the group of ridges is elongated in the direction of the user's height." It possesses the following characteristics.

[0015] The invention of claim 6 is an extension of claim 5, "The holding portion of the cushioning material is composed of a group of annular threads arranged in parallel in a position extending in the circumferential direction of the support frame member, and a group of bridge threads connecting adjacent annular threads." By shortening the circumferential length of the annular yarn toward the inner peripheral side of the holding portion, the holding portion is formed into a bag shape" It is characterized by the above feature.

[0016] In claim 5 or 6, it is possible to knit the ridge portions and the valley portions with yarns of different colors, knit each ridge portion with a plurality of colors, or perform both, so that portions of the same color are formed as stripes in the same posture as the ridge portions.

[0017] Claim 7 specifies the support element. That is, in claim 1 or 2, "The support element is one or more of a seat, a backrest, a headrest, and a shoulder rest" It has such a configuration.

[0018] When applied to a seat and a backrest, it is also possible to make the cushioning materials of both continuous in a series. Alternatively, while covering the surfaces of the seat and the backrest with a continuous knitted fabric material, it is possible to form the ridge portion on only one of them and make the other function as a tension fabric.

[0019] Claim 8 specifies the cushioning material. That is, the invention of claim 8 targets "A knitted fabric cushioning material for use in a chair provided with a support surface member made of woven fabric, knitted fabric, resin plate, or other thin material" , and this cushioning material has a surface portion that overlaps the entire surface of the support surface member, and a holding portion that is continuous with the surface portion and wraps around to the back side of the support frame member, the surface portion has a concavo-convex structure in which three-dimensionally raised ridge portions and thin valley portions are arranged alternately, and the holding portion has a knitted structure without ridge portions" It has such a configuration.

Effects of the Invention

[0020] The cushioning material of the present invention can employ a ribbed knitted fabric, and high ribbed sections can be knitted using thin threads. Therefore, even if the support surface member is made of mesh material or resin plate, the cushioning material can improve cushioning and fit without causing a feeling of pressure. In other words, although it is knitted with thin threads, because it is three-dimensionally knitted, the ribbed sections are elastically compressed and deformed by the body pressure acting on the cushioning material, thus ensuring a soft touch, high fit, and cushioning properties.

[0021] Furthermore, because the cushioning material is made of knitted fabric, breathability is not hindered even if the support surface members have a mesh or porous structure. In addition, its three-dimensional appearance differs from the upholstery covering the urethane cushion, making it aesthetically pleasing as well.

[0022] Furthermore, the cushioning material of the present invention can be easily manufactured in a three-dimensional shape without stitching using, for example, a WholeGarment flat knitting machine manufactured and sold by Shima Seiki Mfg. Ltd. (WholeGarment is both a product name for the knitting machine and a registered trademark designating knitted fabrics and knit products as its goods). Therefore, it is also highly practical.

[0023] As described in claim 2, by arranging the cushioning material so that it spreads across the entire support surface member, the user's body is supported by the ridged portion even if they shift their body, thus ensuring a high level of fit and cushioning. Furthermore, the aesthetic appeal of the cushioning material is enhanced, improving the overall design. Moreover, based on claim 2, the holding portion can be connected as in claim 4 and claim 8, making attachment to the support frame member easier. Additionally, since the cushioning material can be held taut in all directions, twisting is eliminated, ensuring both cushioning and aesthetic effects.

[0024] Claim 3 is highly general because it can be applied to existing chairs with similar mesh specifications.

[0025] As already mentioned, in the configuration of claims 4 and 8, the cushioning material can be easily attached and detached by utilizing the elasticity of the knitted fabric. Therefore, installation and replacement are easy, and it can also be attached to existing chairs. Furthermore, since the support frame member is also surrounded by the cushioning material, the aesthetic appearance can be further improved.

[0026] The ribbed sections of the cushioning material can be formed in various ways, but if they are formed in horizontal or vertical stripes as in claim 5, they can be easily knitted using existing knitting machines, similar to conventional rib knitting. Furthermore, since both horizontal and vertical stripes are well-known and familiar patterns, the design has high acceptance and is likely to be well-received by many people. In addition, it is easy to knit a large number of ribbed sections in close proximity, so a cushioning effect similar to that of urethane can be easily achieved.

[0027] In claim 6, since the holding portion is made of a thin fabric that stretches easily, the holding portion can be expanded against its elasticity and can easily enclose the support frame member. Therefore, the cushioning material is easy to attach and difficult to detach. In addition, because the annular threads of the holding portion and the ridged portion on the surface are in an intersecting position, the aesthetic appeal is enhanced by the accent effect.

[0028] Since it is easy to knit each ridged section with a different colored thread, or to knit the ridged sections and valleys with different colored threads, adopting the configuration of claim 6 makes it possible to achieve a colorful design and significantly improve aesthetic appeal. [Brief explanation of the drawing]

[0029] [Figure 1] In the diagram showing the chair of the embodiment, (A) is a perspective view and (B) is a partial perspective view of the seat cushioning material. [Figure 2] This is a perspective view without the cushioning material attached. [Figure 3] (A) is a separated perspective view, and (B) is a perspective view with the seat cushion material turned upside down. [Figure 4] (A) is a schematic longitudinal front view of Figure 2, viewed from IV-IV; (B) to (D) are diagrams showing the arrangement of the ridge-like parts; and (E) is a longitudinal front view showing another example of the holding part. [Figure 5] In the diagram illustrating a specific example, (A) is a perspective view showing the entire seat, (B) is a magnified perspective view of the seat, and (C) is a magnified view of a part of it. [Figure 6] This figure shows other specific examples. [Figure 7] In the diagrams illustrating other embodiments, (A) is an overall perspective view, (B) is a perspective view of the back cushioning material, and (C) is a partial perspective view of the seat cushioning material in an inverted state. [Modes for carrying out the invention]

[0030] Next, embodiments of the present invention will be described based on the drawings. This embodiment is applied to a chair including a bench. In this application, terms such as "front and back" and "left and right" are used to specify directions, which are based on the orientation of a person seated in a normal posture. The depth direction is the front and back direction. The front view is the direction opposite to the seated person.

[0031] (1) Basic structure of the first embodiment First, let's describe the chair's basic structure. This embodiment is applied to swivel chairs commonly used in offices and retail spaces. First, let's explain the basic structure, mainly referring to Figures 1-3. The chair consists of a leg assembly 1, a seat 2, and a backrest 3 as its basic elements. The leg assembly 1 has a structure in which a leg support column 5, made of a gas cylinder, is inserted into a leg cylinder 4 having four caster-equipped leg wings (leg rods). Therefore, the seat 2 is height-adjustable, but the lever for that purpose is omitted.

[0032] A base 6 is fixed to the upper end of the leg support column 5, and the seat 2 and backrest 3 are attached to the base 6. The seat 2 has a structure in which a seat support frame member 7 made of synthetic resin is stretched over a seat mesh material 8, and the seat support frame member 7 has left and right long seat stays 9 which are fixed to the base 6 integrally formed.

[0033] The backrest 3 also has a rectangular shape with openings at the front and back, and is constructed by stretching a mesh material 11 over a synthetic resin back support frame member 10. Long back stays 12 are formed integrally or separately on the back support frame member 10, and the back stays 12 are fixed to the base 6 via arms 13. Left and right armrest support parts 14 are integrally formed on the back stays 12 (or back support frame member 10), and the armrests 15 are attached to the armrest support parts 14 by fitting them in from above.

[0034] In this embodiment, the seat support frame member 7, to which the seat mesh material 8 is stretched, is fixed to the base 6. However, it is also possible to configure the seat support frame member 7 to which the seat mesh material 8 is attached and the intermediate member fixed to the base 6 as separate components (the same applies to the backrest 3). As a means of attaching the mesh materials 8 and 11 to the frame members 7 and 10, Figure 4(A) shows the seat 2 as an example, illustrating a structure in which an engagement groove 16 is formed on the outer circumferential surface of the seat support frame member 7, and an edge member 17 to which the edge of the seat mesh material 8 is fixed is fitted into the engagement groove 16. However, various other attachment structures can be adopted.

[0035] For example, the mesh material 8, 11 can be pressed and fixed to the frame members 7, 10 by edge members that are overlapped and fixed to the frame members 7, 10 from the surface direction, or the mesh material 8, 11 can be fixed to the frame members 7, 10 by insert molding. When forming an engagement groove 16 as a means for attaching the seat mesh material 8, it is preferable that the engagement groove 16 be formed in a state where it opens downward on the front member of the seat support frame member 7.

[0036] (2).Cushioning material The seat 2 is fitted with a seat cushioning material 20. The seat cushioning material 20 consists of a recessed / uneven structure 21 that overlaps the entire upper surface of the seat mesh material 8, and a holding portion 22 integrally formed on the outer circumference of the recessed / uneven structure 21, with the holding portion 22 wrapping around to the lower surface of the seat support frame member 7. Therefore, the seat cushioning material 20 has a bag-like structure.

[0037] The seat cushioning material 20 is a knitted fabric made of thin yarn such as synthetic fiber yarn, and the uneven structure portion 21 has a structure in which long ridges (convex parts) 23 and valleys 24 are arranged alternately in the front-to-back direction, and the ridges 23 are knitted by double rib knitting or single rib knitting. The valleys 24 are formed as part of the knitting of the ridges 23 and have a structure in which adjacent ridges 23 in the front-to-back direction are connected by weft knitting. Since the uneven structure portion 21 overlaps the entire upper surface of the seat mesh material 8, in this embodiment the uneven structure portion 21 is the surface portion described in the claim.

[0038] On the other hand, the holding portion 22 has a general knit structure, and as schematically shown in Figure 1(B) (see also Figures 5(B) and 6), it is composed of a group of annular yarns 25 arranged in parallel in a position extending circumferentially around the seat support frame member 7, and a group of bridge yarns 26 intertwined with adjacent annular yarns 25. Therefore, the holding portion 22 is formed in a kind of grid pattern. It is preferable to make the height of the ribbed portion 23 as high as possible, and it is preferable to maintain a height of at least about 5 mm.

[0039] The cushioning material 20 has a bag structure with a holding portion 22 and a three-dimensional structure with a group of raised ridge-like portions 23. As previously described, by using Shima Seiki Mfg. Co., Ltd.'s whole garment flat knitting machine, it can be obtained as a seamless, one-piece knitted product. Therefore, it can be manufactured as a beautiful product without the hassle of sewing (this does not rule out the possibility of knitting the uneven structure portion 21 and the holding portion 22 as separate components and sewing them together).

[0040] Various configurations of the uneven surface of the uneven structure 21 can be adopted. Figure 4(B) shows a configuration in which ridge sections 23 of the same height are arranged in parallel, Figure 4(D) shows a configuration in which high ridge sections 23 and low ridge sections 23 are arranged alternately, and Figure 4(D) shows a number of patterns arranged in front of and behind, with two high ridge sections 23 and one low ridge section 23 as one pattern. When using ridge sections 23 of different heights, it is also possible to use three or more different heights.

[0041] Figure 6 shows an actual knitted product, which follows the pattern in Figure 4(B). Figure 5 also shows an actual knitted product, but in Figure 5, a colorful design is achieved by knitting the ridged sections 23 with threads of different colors. In other words, in the example in Figure 5, while the structure basically consists of ridged sections of the same height arranged in parallel front to back, the first ridged section 23a, knitted with two colors of thread (first and second colors), and the second ridged section 23b, knitted with two colors of thread (third and fourth colors), are arranged alternately in the front-to-back direction.

[0042] The color scheme for the first to fourth colors can be set arbitrarily. For example, the first color can be white, the second red, the third yellow, and the fourth blue. Alternatively, a bright atmosphere can be created using warm-colored threads such as red, orange, and blue, or a calm atmosphere can be created using dark or cool-colored threads. In any case, since each thread is pulled out horizontally and woven together, each color will appear as a striped pattern in the seat cushioning material 20.

[0043] Each ridged section 23 is made of a single colored thread, and multiple ridged sections 23 of different colors are arranged alternately (for example, the ridged sections 23 are arranged in a pattern of red, yellow, and orange), or each ridged section 23 is made of multiple colors in the same pattern (for example, each ridged section 23 is made of white thread and red thread), thus enabling a wide variety of color combinations.

[0044] The holding portion 22 has a shape that narrows downwards, but it has a knitted structure with intertwined loops and is elastic, so it can be attached to and detached from the seat support frame member 7 by expanding it against its elasticity. In the example in Figure 4(A), the holding portion 22 is formed to a uniform thickness, but in the example shown in Figure 4(E), the inner circumference portion 22a of the holding portion 22 is thickened. Therefore, in the example in Figure 4(E), the attachment strength of the seat cushioning material 20 can be improved. The inner circumference portion 22a can be thickened by a rib knit structure or the like. In any case, the thickness of the inner circumference portion 22a can be smaller than the height (thickness) of the rib-shaped portion 23.

[0045] As shown by the dashed line in Figure 1, it is possible to attach a knitted back cushioning material 27 to the backrest 3. The back cushioning material 27 in Figure 1 has a uniform thickness knitted structure without ribbed sections 23, but it is also possible to knit ribbed sections 23 with horizontal or vertical stripes, in which case the back cushioning material 27 is also included in the claims of this application.

[0046] Furthermore, if seat cushioning material 20 is attached to both the seat 2 and the backrest 3, and the seat cushioning material 20 is made of threads of multiple colors, the same color scheme as the seat cushioning material 20 can be adopted for the back cushioning material 27, regardless of whether or not the back cushioning material 27 has ridged sections 23. This allows for the formation of a striped pattern with a common color scheme for the backrest 3 and the seat 2, ensuring a high level of design (aesthetic appeal).

[0047] (3) Summary of the first embodiment While the seat mesh material 8 is generally made of woven fabric and incorporates highly elastic yarn as the weft, allowing it to stretch and deform under the user's weight (body pressure) to provide a certain degree of cushioning, the seat mesh material 8 only stretches and deforms as a whole, and cannot partially indent like urethane resin. As a result, it does not fit well and has the problem of being hard against the buttocks (especially the tailbone area) with insufficient cushioning.

[0048] On the other hand, in this embodiment, the seat cushioning material 20 has a group of voluminous ridged portions 23, so it can conform to the user's body and deform to ensure a high level of fit, and each ridged portion 23 has a rebound force against compression, so it also has excellent cushioning properties. In other words, the feel against the body is significantly softer compared to the case where only the seat mesh material 8 is used.

[0049] Furthermore, since the seat cushioning material 20 is made of knitted fabric and has high breathability, it does not hinder the breathability that is a characteristic of the seat mesh material 8, and high cushioning and fit can be ensured while preventing stuffiness. The thighs and buttocks of the sitter often overlap with the periphery of the seat, but if the uneven structure 21 is spread over the entire surface of the seat 2 as in the embodiment, a soft feel can be maintained even if, for example, the sitter's thighs rest on the seat support frame member 7.

[0050] Furthermore, by providing a holding portion 22 on the seat cushioning material 20 as in the embodiment, not only can it be attached to and removed from the seat 2 very easily, but it can also be attached to existing chairs. In this case, since the uneven structure portion 21 is thickly constructed and has high shape retention, the uneven structure portion 21 can be held in a state where it is tightly overlapped with the seat mesh material 8 simply by the holding portion 22 embracing the holding portion 22. Therefore, the seat cushioning material 20 can be attached in a state that prevents shifting in the front, back, left, and right directions.

[0051] As in the embodiment, when the holding portion 22 is formed in a lattice structure, the holding portion 22 deforms without resistance, making it very easy to wrap the holding portion 22 around the seat support frame member 7. The holding portion 22 can also be formed in a diagonal lattice pattern.

[0052] When a back cushioning material 27 is provided on the backrest 3, the holding portion 22 can be formed in a manner that opens backward, as shown by the dashed line in Figure 1, or it can be formed as a bag structure that opens downward. If it is formed as a bag structure that opens downward, the entire rear surface of the backrest 3 can be formed with the seat cushioning material 20, which enhances the uniformity of the design and improves the aesthetics.

[0053] (4) Second Embodiment Figure 7 shows the design applied to a nesting-type pipe chair with a foldable seat 2. The chair's leg assembly 1 is formed in an inverted Y shape in side view, consisting of left and right front legs 28 in a reclined position and left and right rear legs 29 in a forward-leaning position. The rear end of the seat support frame member 7 that constitutes the seat 2 is connected to a support shaft 30 located near the upper end of the front legs 28 so as to be able to flip up and rotate. The left and right front legs 28 are connected by a stay 31 located slightly below the support shaft 30, and the seat 2 is supported by the stay 31 when folded down. The upper ends of the front and rear legs 28 and 29 are connected via a joint 32, but the upper end 29a of the rear leg 29 is exposed above the joint 32.

[0054] The seat support frame member 7 is made of synthetic resin and has an annular structure with openings at the top and bottom, and a seat mesh material (not specified) is stretched over this seat support frame member 7. On the other hand, the backrest 3 is made of synthetic resin and has a back support frame member 10 over which a back mesh material 11 is stretched, and downward-facing bracket portions 33 are integrally formed at the left and right lower ends of the back support frame member 10, and the left and right bracket portions 33 are fitted and fixed to the upper ends of the left and right rear legs 29.

[0055] The seat cushioning material 20 has basically the same structure as in the first embodiment, and has a recessed structure portion 21 and a holding portion 22, but a relief hole 34 is formed in the rear of the holding portion 22 by weaving to avoid interference with the support shaft 30. Therefore, in this embodiment, even if the support shaft 30 is inserted through the seat support frame member 7, the seat cushioning material 20 can be attached to the seat 2.

[0056] On the other hand, the back mesh material 11 that constitutes the backrest 3 is attached to the entire outer circumference of the back support frame member 10, or to the upper and side portions of the back support frame member 10. The back cushioning material 27 has a recessed structure portion 21 that overlaps the back mesh material 11 and a holding portion 22 integrally connected to its outer circumference, and relief holes 35 are opened at the left and right lower ends of the holding portion 22 to expose the bracket portion 33 of the back support frame member 10.

[0057] The back cushioning material 27's holding portion 22 can be configured to open either backward or downward. In either case, since there are relief holes 35 at the left and right lower ends of the holding portion 22, the cushioning and fit can be significantly improved, even though it is a simple pipe chair with a bracket portion 33 provided on the back support frame member 10.

[0058] Although embodiments of the present invention have been described above, the present invention can be implemented in various other ways. For example, the cushioning material can also be applied to headrests and shoulder rests. It can also be applied to chairs without backrests and to multi-section benches (or sofas). Furthermore, it is possible to configure the entire surface of the seat or backrest to be covered with the woven material, while dividing it into areas where ridged sections are formed and areas where ridged sections are not formed. Moreover, the woven cushioning material of the present invention can also be applied to chairs where the seat board or backrest is made of wood or a non-flexible resin board. [Industrial applicability]

[0059] The present invention can be implemented in chairs and seat cushioning materials. Therefore, it can be used industrially. [Explanation of Symbols]

[0060] 1 leg device 2nd seat 3 Backrest 6 Base 7. Seat support frame member 8. Mesh material for the seat 10 Rear support frame member 11. Back mesh material 16 Engagement groove 17 Edge members 20 Seat cushioning material 21 Uneven structure (surface part) 22 Holding part 23 ridges 25 circular threads 26 Bridge thread 27 Back cushioning material

Claims

1. It has a support element that supports the user's body, and the support element comprises a support surface member that receives body pressure, which is the pressing force of the user's body, and a rigid support frame member to which the periphery of the support surface member is fixed. The support surface member is made of woven fabric, knitted fabric, resin plate, or other flexible thin material, and is permitted to stretch and deform under the user's body pressure, A cushioning material made of knitted fabric, having an uneven structure in which three-dimensionally raised ridges and thin valleys are arranged alternately, is placed on at least a portion of the support surface member that comes into contact with the user's body. chair.

2. The cushioning material covers the entire surface of the support surface member. The chair described in claim 1.

3. The support frame member has a frame structure that opens in the front-back direction of the support surface member. The chair according to claim 1 or 2.

4. The periphery of the cushioning material has a holding portion that is wrapped around the back side of the support frame member, and the holding portion is thinner than the ridged portion. The chair described in claim 2.

5. The cushioning material is formed in a horizontal stripe pattern in which the group of ridges is elongated in the left-right direction across the user's body, or in a vertical stripe pattern in which the group of ridges is elongated in the direction of the user's height. The chair described in claim 2.

6. The holding portion of the cushioning material is composed of a group of annular threads arranged in parallel in a position extending in the circumferential direction of the support frame member, and a group of bridge threads connecting adjacent annular threads. By shortening the circumference of the annular yarn toward the inner circumference of the holding portion, the holding portion is formed in a bag shape. The chair described in claim 5.

7. The aforementioned support element is one or more of the seat, backrest, headrest, and shoulder rest. The chair according to claim 1 or 2.

8. A cushioning material made of knitted fabric used in chairs equipped with support surface members made of woven fabric, knitted fabric, resin plate, or other thin material, It has a surface portion that overlaps the entire surface of the support surface member, and a holding portion that wraps around to the back side of the support frame member in a state continuous with the surface portion. The surface portion has an uneven structure in which three-dimensionally raised ridges and thin valleys are arranged alternately, while the holding portion has a knitted structure in which there are no ridges. Cushioning material for chairs.

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