Chair

Abstract

To provide a chair which can be installed without requiring much space, is comfortable to sit on, and enables a user to relax.SOLUTION: The chair 100 includes a frame part 10 and a sheet material 20 attached to the frame part 10. The frame portion 10 includes a pair of left and right seat surface support portions 11 extending in the front-rear direction, a pair of left and right leg portions 12 extending in the front-rear direction, and a pair of left and right front leg portions 13 connecting the pair of seat surface support portions 11 and the pair of leg portions 12 and extending in the up-down direction, the frame portion 10 has elasticity, and the pair of seat surface support portions 11 can be bent so as to approach each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a chair having a structure in which a seat material is attached to a frame portion. [Background technology]

[0002] Various chair shapes have been proposed. In particular, chairs have been proposed in which a sheet material made of a flexible yet strong fabric is used for the seat, backrest, and other areas that come into contact with the body of the seated person, and this sheet material is stretched over a frame that serves as a framework. For example, the sheet material has a cylindrical portion at the edge, and the frame is inserted into this cylindrical portion, so that the sheet material is stretched between the frames. When a person sits on such a chair, their back, buttocks, thighs, etc. come into contact with the seat material and are supported by it. Because the seat material is made of flexible fabric, the pressure on the person's body is reduced. This reduces the strain on the body, preventing discomfort such as pain even when sitting for long periods of time, and allowing for comfortable sitting.

[0003] Such chairs have been proposed in the past, and for example, the chair described in Patent Document 1 includes a thin fabric sheet material on which the rearward body pressure of a seated person is applied, and left and right upright side frames that are vertically elongated and covered with the thin sheet material, the thin sheet material having elasticity that allows it to expand and contract at least in the left and right directions and being attached to the upright side frames in a state stretched at least in the left and right directions within its elastic limit. The left and right upright side frames are connected by a horizontally elongated connecting frame so that the distance between them is maintained.

[0004] According to the chair described in Patent Document 1, the thin sheet material is stretched at least in the left-right direction within its elastic limit, and by using a thin sheet material with appropriate elasticity, even if the weight of the seated person varies slightly, the thin sheet material will not sink excessively due to body pressure, and the user's body can be elastically supported. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5957067 Summary of the Invention [Problem to be solved by the invention]

[0006] Here, for example, a hammock, which is a type of bedding, is a net or piece of cloth that is hung on a tree or other object at both ends, allowing the user to sleep or relax in the hammock. A hammock places little strain on the user's body, and the user feels as if they are wrapped in the hammock, which also has the effect of allowing the user to relax.

[0007] However, in the chair described in Patent Document 1, the spacing between the left and right upright side frames is maintained, and although the occupant sinks to some extent, the degree to which the occupant sinks is determined by the elasticity of the thin sheet material, and the occupant is not enveloped like in a hammock. Therefore, it is difficult to say that the occupant can relax. In particular, it is desirable for chairs used by people with autism or attention deficit hyperactivity disorder to be able to sit in a relaxed manner.

[0008] There are also chairs that are shaped like hammocks, with both ends of a hammock-like fabric or similar material hooked between frames that are set apart from each other. These chairs allow the sitter to sit in a relaxed state as if wrapped in fabric or similar material, but they have the problem of requiring a relatively large installation space.

[0009] The present invention has been made in view of the above problems, and its object is to provide a chair that can be installed without taking up much space, is comfortable to sit in, and allows a person to relax. [Means for solving the problem]

[0010] A chair according to one aspect of the present invention is a chair comprising a frame portion and a seat material attached to the frame portion, wherein the frame portion comprises a pair of seat support portions arranged on the left and right and extending forward and backward, a pair of legs arranged on the left and right and extending forward and backward, and a pair of front legs arranged on the left and right and extending vertically, connecting each of the pair of seat support portions to each of the pair of legs, and wherein the frame portion is elastic and the pair of seat support portions can bend so as to approach each other.

[0011] As a result, when a person sits down, the pair of seat support parts bend toward each other, causing the person to sink into the seat material between the pair of seat support parts. This allows the person to feel enveloped in the seat material, making for a comfortable and relaxing seat. Furthermore, this configuration does not require a large installation space.

[0012] Furthermore, in the above-described chair, the frame portion may include a pair of left and right back support portions extending upward from the rear ends of each of the pair of seat support portions, a pair of left and right head support portions extending rearward from the upper ends of each of the pair of back support portions, and left and right connecting portions arranged between the pair of head support portions, connected to each of the pair of head support portions, and extending in the left and right direction.

[0013] As a result, when a seated person sits down, the seated person's upper body sinks into the seat material between the pair of back support parts, and is enveloped by the seat material. Also, because the head support parts extend in the front-to-rear direction, the seated person's head and other parts sink into the seat material between the pair of head support parts. As a result, the seated person is enveloped by the seat material, and can sit comfortably and relax. Furthermore, because the chair is equipped with left and right connecting parts that extend in the left and right direction, it has strength in the left and right direction and is less likely to break.

[0014] Furthermore, in the above-described chair, the sheet material may be in the form of an elastic bag, and the sheet material may be attached to the frame portion by covering the left and right connecting portions of the frame portion in the order of the head support portion, the back support portion, the seat support portion, and the front leg portion.

[0015] This allows the seat material to be easily attached to the frame by simply covering it with the frame, making it easy to manufacture the chair. Also, the seat material can be easily replaced.

[0016] In the above-described chair, the sheet material may include a first sheet portion and a second sheet portion, and the first sheet portion and the second sheet portion may have different appearances.

[0017] This allows the user to select whether the first seat section or the second seat section will be the seating surface side depending on the preference of the seated person, etc. This makes it easy to change the appearance of the chair.

[0018] In the above-described chair, the sheet material may include a first sheet portion and a second sheet portion, and the first sheet portion and the second sheet portion may have different stretchability.

[0019] This allows the user to select whether the first seat portion or the second seat portion is the seat surface side depending on the preference of the seated person, etc. This makes it easy to change the comfort of the chair.

[0020] In addition, the above-mentioned chair may be provided with a cushion portion arranged to cover the left and right connecting portions, the head support portion, the back support portion, the seat support portion, and the front leg portions.

[0021] This means that even if a part of the seated occupant's body comes into contact with a part other than the seat material, the body is less likely to get hurt and the seating comfort is not impaired.

[0022] In addition, the chair described above may be provided with a sheet material fixing device for fixing the sheet material to the front leg portion, and the sheet material fixing device may be installed below the cushion portion that covers the leg portion.

[0023] In this way, the provision of the sheet material fixing device can prevent the sheet material attached to the frame from shifting and coming off the frame. Furthermore, even if a strong force is applied to the sheet material, the sheet material fixing device catches on the cushion part, making it difficult for the sheet material to shift.

[0024] In the above-described chair, the seat support portion may be inclined so as to become lower toward the rear side.

[0025] As a result, when a person sits in the chair, their body is guided backward, so that they sit deeply and their back comes into contact with the backrest. This means that the person sits as if they are wrapped in the seat material, allowing them to sit comfortably and relax. [Effects of the Invention]

[0026] According to the present invention, it is possible to provide a chair that can be installed without taking up much space, is comfortable to sit in, and allows for relaxation. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a perspective view showing the external configuration of a chair according to an embodiment of the present invention; [Figure 2] 1 is a side view showing the external configuration of a chair according to an embodiment of the present invention. [Figure 3] 1 is a perspective view showing the configuration of a frame portion of a chair according to an embodiment of the present invention. [Figure 4] 1 is a perspective view showing a state in which a cushion portion is arranged on a frame portion of a chair according to an embodiment of the present invention. FIG. [Figure 5]FIG. 2 is an enlarged exploded perspective view illustrating a joining state in a frame portion of a chair according to an embodiment of the present invention. [Figure 6] FIG. 5 is a cross-sectional view of the frame portion in FIG. [Figure 7] FIG. 10 is a perspective view illustrating a method for attaching a sheet material to a frame portion in a chair according to an embodiment of the present invention. [Figure 8] FIG. 2 is an enlarged view of an area A in FIG. [Figure 9] 1 is a side view showing a state in which an occupant is seated in a chair according to an embodiment of the present invention; [Figure 10] 1 is a plan view showing a state in which an occupant is seated in a chair according to an embodiment of the present invention; [Figure 11] 10A and 10B are diagrams showing the configuration of a seat material of a chair according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] The configuration of a chair according to this embodiment will be described with reference to the drawings. FIG. 1 is a perspective view showing the external configuration of a chair according to this embodiment of the present invention. FIG. 2 is a side view showing the external configuration of a chair according to this embodiment of the present invention. Note that, with respect to the coordinate axes shown in FIGS. 1 and 2, when a person is seated on chair 100, the X-axis direction is the left-right direction (horizontal direction), and the positive X-axis direction and the negative X-axis direction represent the left side and the right side, respectively. The Y-axis direction represents the up-down direction, i.e., the vertical direction, and the positive Y-axis direction and the negative Y-axis direction represent the upper side and the lower side, respectively. The Z-axis direction is the depth direction (front-rear direction), and the positive Z-axis direction and the negative Z-axis direction represent the front side and the rear side, respectively. This also applies when coordinates are illustrated in the subsequent drawings.

[0029] As shown in Figures 1 and 2, the chair 100 of this embodiment comprises a frame portion 10 which forms the framework, a bag-shaped sheet material 20 which is attached to the frame portion 10 by inserting the frame portion 10 through it, and a clip 40 for fixing the sheet material 20 to the frame portion 10.

[0030] The frame portion 10 has elasticity and is made of, for example, a metal pipe. As will be described in detail later, a portion of the frame portion 10 will bend when a person sits on the chair 100. The frame portion 10 may be made of a material other than a metal pipe as long as it has this property. As will be described in detail later, the sheet material 20 is attached to the frame portion 10 by being placed over a portion of the frame portion 10. As will be described in detail later, the sheet material 20 is fixed to the frame portion 10 by being sandwiched together with the frame portion 10 by clips 40 to prevent the sheet material 20 from shifting when attached to the frame portion 10. As will be described in detail later, a cushion portion 30 (see FIG. 4 ) is arranged on a portion of the frame portion 10 so as to cover the frame portion 10, and the sheet material 20 covers not only the frame portion 10 but also the cushion portion 30 arranged on the frame portion 10.

[0031] The seat material 20 is flexible and made of stretchable fabric or the like. When a person sits on the chair 100, the person's body comes into contact with the seat material 20 stretched between the frame portions 10, but because the seat material 20 is flexible, the person's body is unlikely to become sore even if they sit for a long time. In addition, because the seat material 20 is stretchable, when a person sits down, the seat material 20 stretches due to the person's weight, causing the person's body to sink in somewhat.

[0032] The chair 100 also has a seat surface 1 with which the occupant's buttocks and thighs come into contact when seated, a backrest 2 with which the occupant's back comes into contact, a head surface 3 with which the occupant's head and neck come into contact, and a leg surface 4 with which the occupant's calves come into contact. The seat surface 1 is inclined so that it becomes lower toward the rear. As a result, when the occupant sits on the chair 100, the occupant's body is guided toward the backrest 2. As a result, the occupant's back comes into contact with the backrest 2, which is the seat material 20, and then sinks further into the backrest 2 (seat material 20). In this way, the occupant sits in a state that seems to sink into the seat material 20. Therefore, the occupant feels as if they are being embraced by the chair 100. This allows the occupant to relax. The angle of inclination of the seat surface 1 may be set to an angle that allows the occupant to sit in a relaxed manner. For example, it may be inclined at an angle of 5° to 20° with respect to the horizontal plane (ZX plane).

[0033] Furthermore, as will be described in detail later, when the frame portion 10 flexes when the occupant sits down, the effect of the occupant being enveloped by the seat material 20 is increased, allowing the occupant to sit in a more relaxed state.

[0034] Next, the configuration of the frame section 10 will be described with reference to the drawings. Fig. 3 is a perspective view showing the configuration of the frame section of the chair according to the embodiment of the present invention. As shown in Fig. 3, the frame section 10 includes a seat support section 11, legs 12, front legs 13, a back support section 14, a head support section 15, upper left and right connecting sections 16a, and lower left and right connecting sections 16b, and is formed, for example, by bending a metal pipe. Specifically, it can be disassembled into multiple members and is formed by joining these members together.

[0035] In this embodiment, the frame 10 is separable into an upper first frame portion 10a and a lower second frame portion 10b, which are joined together at a joint 17 to form a single unit. The joining configuration is not particularly limited, but in this embodiment, a rod-shaped core member 60 (see FIGS. 5 and 6) is inserted into the inside of the first frame portion 10a and the second frame portion 10b, which are tubular pipes, and bolts 18 are screwed into the first frame portion 10a and the second frame portion 10b from the sides thereof to fix the first frame portion 10a and the core member 60, and also fix the second frame portion 10b and the core member 60. In this way, the first frame portion 10a and the second frame portion 10b are fixed via the core member 60, and the first frame portion 10a and the second frame portion 10b are joined together.

[0036] Furthermore, the cushion portion 30, which will be described later, is arranged so as to cover the frame portion 10, but the cushion portion 30 may be installed after the first frame portion 10a and the second frame portion 10b are joined together. Alternatively, the frame portion 10 may be constructed by first arranging the cushion portion 30 on each of the first frame portion 10a and the second frame portion 10b, and then joining the first frame portion 10a and the second frame portion 10b together.

[0037] The seat support portions 11 are arranged in a pair on the left and right and extend in the front-to-rear direction. A sheet material 20 is stretched between the pair of seat support portions 11 to form the seat surface 1 as shown in FIG. 1. As described above, the seat surface 1 is inclined so that it becomes lower toward the rear, and the seat support portions 11 are also inclined so that it becomes lower toward the rear. Furthermore, the pair of seat support portions 11 can bend so that they approach each other.

[0038] The legs 12 are arranged in a pair on the left and right, extending forward and backward, and the pair of legs 12 are in contact with the installation surface of the chair 100. The front legs 13 are arranged in a pair on the left and right, extending vertically so as to connect each of the pair of seat supports 11 to each of the pair of legs 12. A sheet material 20 is stretched between the pair of front legs 13, thereby forming the leg surface 4 as shown in FIG. 1. The sheet material 20 is fixed to the front legs 13 by clips 40.

[0039] The back support portions 14 extend upward from the rear ends of the pair of seat support portions 11, and are arranged in a pair on the left and right. A sheet material 20 is stretched between the pair of back support portions 14, thereby forming the backrest 2 as shown in FIG. 1. The head support portions 15 extend rearward from the upper ends of the pair of back support portions 14, and are arranged in a pair on the left and right. A sheet material 20 is stretched between the pair of head support portions 15, thereby forming the head surface 3 as shown in FIG. 1. The upper left and right connecting portions 16a are arranged between the pair of head support portions 15, and are connected to the rear ends of the pair of head support portions 15. The upper left and right connecting portions 16a are also arranged between the pair of legs 12, and are connected to the rear ends of the pair of legs 12. Since the upper left and right connecting parts 16a are installed at the rear ends of the head support parts 15 and the lower left and right connecting parts 16b are installed at the rear ends of the legs 12, the pair of head support parts 15 do not approach each other at the rear, and the pair of legs 12 do not approach each other at the rear. However, the frame part 10 can bend so that the front sides of the pair of legs 12 approach each other. The pair of seat support parts 11 can bend so that they approach each other.

[0040] Next, the state in which the cushion unit 30 is arranged on the frame unit 10 will be described with reference to the drawings. Fig. 4 is a perspective view showing the state in which the cushion unit is arranged on the frame unit of a chair according to an embodiment of the present invention. As shown in Fig. 4, when the sheet material 20 is removed from the chair 100, the cushion unit 30 is attached to the frame unit 10 so as to cover the upper left and right connecting units 16a, the head support unit 15, the back support unit 14, the seat support unit 11, and the front legs 13. It is not necessary to cover the entire front legs 13.

[0041] When manufacturing chair 100, first, frame portion 10 is manufactured. Then, cushion portion 30 is attached so as to cover manufactured frame portion 10, and further, as described below, sheet material 20 is placed over frame portion 10 and fixed to frame portion 10 with clips 40, thereby manufacturing chair 100.

[0042] The cushion portion 30 may be made of a soft and elastic material, such as urethane or sponge. Even when a seated person rests their elbows or head on the frame portion 10, the frame portion 10 is covered by the cushion portion 30, so the seated person does not experience any discomfort, such as pain. Note that the areas of the frame portion 10 that are covered by the cushion portion 30 are not limited to the above-mentioned areas, and the position of the cushion portion 30 may be changed as long as the seated person can sit comfortably.

[0043] Here, the joining state of the first frame portion 10a and the second frame portion 10b in the frame portion 10 will be described in detail with reference to the drawings. Fig. 5 is an enlarged exploded perspective view for explaining the joining state in the frame portion of the chair according to the embodiment of the present invention. Fig. 6 is a cross-sectional view of the frame portion in Fig. 4. Specifically, Fig. 6 is a cross-sectional view along the XY plane near the joining portion 17 of the frame portion 10 in Fig. 4.

[0044] As described above, the first frame portion 10a and the second frame portion 10b are fixed together by the bolts 18 via the rod-shaped core member 60. Specifically, as shown in FIG. 5 , one end of the rod-shaped core member 60 is inserted into the inside of the first frame portion 10a, which is a tubular pipe, and the other end of the core member 60 is inserted into the inside of the second frame portion 10b, which is also a tubular pipe. In this state, the bolts 18 are screwed into the core member 60 from the sides of the first frame portion 10a and the second frame portion 10b. This fixes the first frame portion 10a to the core member 60, and fixes the second frame portion 10b to the core member 60. This fixes the first frame portion 10a to the core member 60, and joins the first frame portion 10a to the second frame portion 10b. It is to be noted that the first frame portion 10a and the second frame portion 10b may have through holes formed in advance for inserting the bolts 18 therethrough, and the core member 60 may have threaded holes formed in advance.

[0045] 6, a core member 60 is inserted inside the tubular (cylindrical) frame portion 10, and bolts 18 are inserted from the side into through holes formed in the frame portion 10 and screwed into the core member 60, thereby fixing the frame portion 10 and the core member 60 together. In addition, a cushion portion 30 is arranged around the frame portion 10.

[0046] In this way, after the cushion section 30 is installed on the frame section 10 (see FIG. 4), the sheet material 20 is attached and fixed to the frame section 10 with clips 40, thereby completing the chair 100.

[0047] Next, a method for attaching the sheet material 20 to the frame portion 10 will be described with reference to the drawings. Fig. 7 is a perspective view for explaining a method for attaching the sheet material to the frame portion of a chair according to an embodiment of the present invention. Fig. 8 is an enlarged view of area A in Fig. 1.

[0048] As shown in FIG. 7 , the sheet material 20 is attached to the frame portion 10 by covering the frame portion 10, on which the cushion portion 30 is installed, with the sheet material 20 from the upper left and right connecting portions 16a. Here, the sheet material 20 is bag-shaped having a bottom portion 21 and an opening 22, and is attached to the frame portion 10 by covering the opening 22 over the frame portion 10 in the following order: the upper left and right connecting portions 16a, the head support portion 15, the back support portion 14, the seat support portion 11, and the front leg portions 13. Because the sheet material 20 is bag-shaped, it is easy to cover the frame portion 10 with the sheet material 20. Therefore, the sheet material 20 can be easily attached to the frame portion 10.

[0049] When the opening 22 of the sheet material 20 reaches a predetermined position halfway along the front leg 13 of the frame 10, the sheet material 20 is fixed to the front leg 13 of the frame 10 using a clip 40, as shown in Fig. 8. The dimensions of the sheet material 20 may be such that the bottom 21 reaches the upper left and right connecting portions 16a when the opening 22 reaches the predetermined position on the front leg 13.

[0050] The clip 40 is made of an elastic resin or the like and has a shape that allows the frame portion 10 to fit into it. Specifically, the clip 40, together with the sheet material 20, is fitted into the front leg portion 13 (frame portion 10), thereby fixing the sheet material 20 to the front leg portion 13. The inner diameter of the clip 40 is smaller than the outer diameter of the cushion portion 30 that covers the frame portion 10. As a result, even if a seated person sits on the sheet material 20 and a force is applied to the front leg portion 13 so as to cause the sheet material 20 to shift upward, the clip 40 catches on the cushion portion 30, thereby preventing the sheet material 20 from shifting upward further, thereby reliably preventing the sheet material 20 from shifting. Note that the clip 40 is not limited to the above configuration. Any configuration that can fix the sheet material 20 to the front leg portion 13 (frame portion 10) is sufficient.

[0051] The configuration and manufacturing procedure of the chair 100 according to this embodiment have been described above. Next, with reference to the drawings, the chair 100 will be described when a seated person is seated on the chair 100. Fig. 9 is a side view showing a state in which a seated person is seated on the chair according to the embodiment of the present invention. Fig. 10 is a plan view showing a state in which a seated person is seated on the chair according to the embodiment of the present invention. Note that Figs. 9 and 10 also show the seated person H.

[0052] 9 and 10, when seated person H sits on chair 100, the buttocks and thighs of seated person H contact seat surface 1, the back of seated person H contacts backrest 2, the head and neck of seated person H contact head surface 3, and the calves of seated person H contact leg surface 4. In this state, the weight of seated person H is applied to seat surface 1 and backrest 2. At this time, since sheet material 20 is flexible and stretchable as described above, sheet material 20 deforms to fit the body of seated person H, and as sheet material 20 stretches, seated person H sinks in, and seated person H is enveloped by sheet material 20, allowing him to relax.

[0053] As described above, the frame 10 is elastic, and the pair of seat support portions 11 can bend toward each other. When a seated person H sits on the chair 100, the weight of the seated person H applies a force from above to the seat 1. This pulls the sheet material 20 of the seat 1 downward, and as shown in Figure 10, both of the pair of seat support portions 11 on the left and right of the frame 10 are pulled by the sheet material 20 and bend toward each other.

[0054] In this way, as the seat support parts 11 bend to approach each other, the amount by which the seat material 20 sinks further downward increases. As a result, the seated person H sits in a more sunken state. Furthermore, as the seat support parts 11 bend to approach each other, the pair of seat support parts 11 move closer to the seated person H, so the seated person H feels more embraced. Therefore, the seated person H can sit in a more relaxed manner.

[0055] In other words, with the chair 100 of this embodiment, when the seated person H sits down, not only does the seat material 20 stretch and cause the seated person H to sink down, but the seat support parts 11 arranged on the left and right sides of the seated person H bend to move closer to the seated person H, increasing the sinking amount, and the left and right seat support parts 11 bend to move closer to the seated person H, so that the seated person H feels more enveloped in the seat material 20.

[0056] Furthermore, as described above, because the seat surface 1 becomes lower as it goes rearward, when the seated person H sits in the chair 100, he or she naturally sits deeper and naturally leans his or her back against the backrest 2. Also, by leaning against the backrest 2, the sheet material 20 in the backrest 2 also stretches, and the pair of left and right back support parts 14 also bend so as to approach each other, so that the seated person H's back, waist, buttocks, and thighs are enveloped by the sheet material 20, allowing him or her to feel more relaxed.

[0057] Furthermore, when the calves of the seated person H come into contact with the sheet material 20 on the leg surface 4, the sheet material 20 deforms appropriately, supporting the calves of the seated person H without placing a burden on them. Furthermore, when the head and neck of the seated person H come into contact with the sheet material 20 on the head surface 3, the sheet material 20 deforms appropriately, supporting the head and neck of the seated person H without placing a burden on them.

[0058] Furthermore, as mentioned above, the weight of the seated person H causes the seat support parts 11 etc. to bend closer to each other, but since the upper left and right connecting parts 16a and the lower left and right connecting parts 16b in the frame part 10 are arranged so as to extend left and right, the strength of the chair 100 in the left and right direction is maintained, and the chair 100 will not be damaged by the weight of the seated person H.

[0059] As described above, the chair 100 according to this embodiment allows the seated person H to sit in a wrapped state, maintaining a relaxed state and providing a comfortable seating experience. Furthermore, because the structure is simple, it can be easily manufactured without increasing manufacturing costs. Furthermore, unlike a hammock or the like, it does not require a large installation space, and can be installed without taking up much space.

[0060] In particular, people with autism or attention deficit hyperactivity disorder desire a chair that allows them to sit in a relaxed manner, and for these people, the chair 100 according to this embodiment is particularly suitable.

[0061] (Other embodiments) Although the chair 100 according to this embodiment has been described, for example, the seat material 20 may have a different configuration from that described above. The configuration of the seat material 20 in the chair 100 according to another embodiment will be described with reference to the drawings. Note that the configuration other than the seat material 20 may be the same as that of this embodiment.

[0062] FIG. 11 is a diagram showing the configuration of a seat material of a chair according to another embodiment of the present invention. As shown in FIG. 11, the seat material 20 may be configured with a first seat portion 23a and a second seat portion 23b that are different from each other. Specifically, one side and the other side of the bag-shaped sheet material 20 may be made of different fabrics, etc., and these may be sewn together to form a bag shape. For example, the first seat portion 23a and the second seat portion 23b may have different patterns, etc., so that their appearances are different from each other. The seat occupant may change the first seat portion 23a or the second seat portion 23b to face the seat surface 1 (the side that is visible when seated) according to their preference. This allows the seat occupant to face the first seat portion 23a or the second seat portion 23b to face the seat surface 1 depending on their mood.

[0063] When the first seat portion 23a is located on the seat surface 1 side and the second seat portion 23b is located on the seat surface 1 side, the seat occupant first removes the clip 40 from the frame portion 10 and removes the sheet material 20 from the frame portion 10 (cushion portion 30). Specifically, the bottom portion 21 of the sheet material 20 is pulled in a direction that removes it from the frame portion 10. This removes the sheet material 20 from the frame portion 10, and then the seat material 20 is reattached to the frame portion 10 so that the second seat portion 23b is located on the seat surface 1 side. Note that a similar procedure can be used to change the first seat portion 23a to the seat surface 1 side when the second seat portion 23b is located on the seat surface 1 side. In this way, it is possible to easily select whether the first seat portion 23a is located on the seat surface 1 side or the second seat portion 23b is located on the seat surface 1 side.

[0064] The first seat portion 23a and the second seat portion 23b may be made of materials with different elasticity. This allows the seated person to easily choose the side with the preferred elasticity as the seat surface 1 side depending on their mood. This allows the seat surface 1 to have the desired type of elasticity, making it more comfortable to sit on.

[0065] Although the first seat portion 23a and the second seat portion 23b have been described as having different appearances and different stretchability, they may differ in other respects. Alternatively, a plurality of different types of seat materials 20 may be provided, allowing the seated person to select and change the seat material 20 that they prefer. This allows the seated person to easily change the chair 100 to suit their preferences.

[0066] The present invention is not limited to the above-described embodiments, but can be embodied in various other forms. Therefore, these embodiments are merely illustrative in all respects and should not be interpreted as limiting. The scope of the present invention is defined by the claims and is not limited in any way by the text of the specification. Furthermore, all modifications and variations that fall within the equivalent range of the claims are within the scope of the present invention. [Explanation of symbols]

[0067] 1 seat 2 backrest 3 Head surface 4 Leg surface 10 Frame section 10a First frame section 10b Second frame part 11 Seat support 12 Legs 13 Front legs 14 Back support part 15 Head support 16a Upper left and right joints (left and right joints) 16b Lower left and right connecting section 17 Joint 18 volts 20 Sheet material 21 Bottom 22 Aperture 23a First seat section 23b Second seat section 30 Cushion part 40 Clip (sheet material fixing device) 60 Core member 100 chairs H seated person

Claims

1. A chair comprising a frame portion and a seat material attached to the frame portion, The frame portion is A pair of seat support parts are arranged on the left and right and extend forward and backward; A pair of legs are arranged on the left and right and extend forward and backward, a pair of front legs arranged on the left and right and extending in the up-down direction, connecting each of the pair of seat support portions and each of the pair of leg portions; A chair characterized in that the frame portion has elasticity, and the pair of seat support portions can bend so as to approach each other.

2. The frame portion is a pair of left and right back support portions extending upward from rear ends of the pair of seat support portions; A pair of left and right head support portions extending rearward from the upper ends of the pair of back support portions, respectively; 2. The chair according to claim 1, further comprising: left and right connecting portions disposed between the pair of head support portions, connected to each of the pair of head support portions, and extending in the left and right direction.

3. the sheet material is in the shape of a stretchable bag, 3. The chair according to claim 2, wherein the sheet material is attached to the frame portion by covering the left and right connecting portions of the frame portion in the order of the head support portion, the back support portion, the seat support portion, and the front leg portion.

4. the sheet material includes a first sheet portion and a second sheet portion; 4. The chair according to claim 3, wherein the first seat portion and the second seat portion have different appearances.

5. the sheet material includes a first sheet portion and a second sheet portion; 4. The chair according to claim 3, wherein the first seat portion and the second seat portion have different elasticity.

6. 3. The chair according to claim 2, further comprising a cushion portion arranged to cover the left and right connecting portions, the head support portion, the back support portion, the seat support portion, and the front leg portion.

7. a sheet material fixing device for fixing the sheet material to the front leg portion; 7. The chair according to claim 6, wherein the sheet material fixing device is installed below the cushion portion that covers the leg portion.

8. 2. The chair according to claim 1, wherein the seat support portion is inclined so as to become lower toward the rear side.

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