Chair and chair manufacturing method

Abstract

To provide a chair highly convenient and a manufacturing method for the chair.SOLUTION: A chair includes a leg and a seat part. The leg has: a plate-shaped front part; a plate-shaped rear part facing the front part; and a pair of side parts that are plate-shaped and connect the front part and the rear part in a circumferential direction. The seat part has a seat surface part and a back surface part standing from an end of the seat surface part. A central part of the front part bends so that it protrudes backward; a central part of the rear part bends so that it protrudes forward; the front part and the rear part are adhered at bent parts; and a pair of side parts and the back surface part are formed by an integral material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a chair and a method for manufacturing a chair. [Background technology]

[0002] Chairs and the like that can be easily assembled in the event of a disaster have been developed. For example, Patent Document 1 below discloses a technique relating to a simple chair made of cardboard. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-5815 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned patent document lacks convenience because it is necessary to use paper materials such as pre-processed cardboard.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly convenient chair and a method for manufacturing the chair. [Means for solving the problem]

[0006] In order to solve the above problems, according to one aspect of the present invention, there is provided a chair comprising legs and a seat, wherein the legs have a plate-shaped front portion, a plate-shaped rear portion facing the front portion, and a pair of plate-shaped side portions circumferentially connecting the front portion and the rear portion, the seat portion has a seat surface portion and a back portion erected from an end portion of the seat surface portion, the central portion of the front portion is bent so as to protrude rearward, and the central portion of the rear portion is bent so as to protrude forward, the front portion and the rear portion are bonded at the bent portions, and the pair of side portions and the back portion are formed from a single material. Chairs are provided.

[0007] Further, in order to solve the above-mentioned problems, according to another aspect of the present invention, there is provided a method for manufacturing a chair using a member, wherein the member comprises a first side portion, a second side portion opposing the first side portion, and a pair of opposing third side portions circumferentially connecting end portions of the first side portion and the second side portion, the first side portion comprising a first main surface and a first lower flap provided on a lower portion of the first main surface, the second side portion comprising a second main surface having the same height as the first main surface, a second lower flap provided on a lower portion of the second main surface, and an upper flap provided on an upper portion of the second main surface, the area of ​​the first side portion being larger than the area of ​​each of the pair of third side portions, the method comprising: a creasing step of creasing the first side portion and the second side portion along a vertical direction and in a direction in which the first side portion and the second side portion approach each other; A method for manufacturing a chair is provided, comprising: a first cutting step of separating a portion of the first side surface portion above a position of a first predetermined length from the lower end of the main surface from the connection portion of the pair of third side surface portions; a second cutting step of making a slit in the width direction at a position of the first predetermined length from the connection portion of the second main surface with the second lower flap and making a slit along the fold line above the slit in the upper second side surface portion; a fastening step of fastening the fold line in the portion of the first main surface from the connection portion of the first lower flap to the position of the first predetermined length and the fold line in the portion of the second main surface from the connection portion of the second lower flap to the position of the first predetermined length; and a folding step of folding the pair of third side surface portions inward at a position above the first predetermined length and forming the seat and back of the chair with the folded-back portions. [Effects of the Invention]

[0008] As described above, according to the present invention, it is possible to improve convenience. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing the configuration of a chair 1 according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a diagram showing the configuration of the chair 1 according to the embodiment as viewed from behind. [Figure 3] FIG. 2 is a bottom view of the configuration of the leg 2 that constitutes the chair 1 according to the embodiment. [Figure 4] 10 is a diagram for explaining step S1 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 5] 10 is a diagram for explaining step S2 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 6] 10 is a diagram for explaining step S3 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 7] 10 is a diagram for explaining step S4 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 8] 10 is a diagram for explaining step S5 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 9] 10 is a diagram for explaining step S6 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 10] 10 is a diagram for explaining step S7 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 11] 10 is a diagram for explaining step S8 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 12] 10 is a diagram for explaining step S9 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 13] 10 is a diagram for explaining step S10 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 14] 10 is a diagram for explaining step S11 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 15] 10 is a diagram for explaining step S12 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 16] 10 is a diagram for explaining step S13 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 17] 10 is a diagram for explaining step S14 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 18] 10 is a diagram for explaining step S15 of the manufacturing method of the chair 1 according to the embodiment. FIG. [Figure 19] 10A to 10C are diagrams showing configuration examples of chairs according to first and second modified examples of the embodiment. [Figure 20] 10A and 10B are diagrams illustrating an example of a manufacturing method for a chair according to a first modified example of the embodiment. [Figure 21] 10A and 10B are diagrams illustrating an example of a manufacturing method for a chair according to a second modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant explanations will be omitted.

[0011] One embodiment of the present invention relates to a simple chair for use in, for example, evacuation shelters during disasters or outdoors. Specifically, the chair according to this embodiment can be easily made using a so-called cardboard box. Conventionally, such simple chairs have been, for example, foldable or made using pre-processed paper patterns. However, the former often have complex folding structures or are heavy due to the folding structure, making them unsuitable for portability. Meanwhile, the latter often require the preparation of such paper patterns, and are cost-effective because they only serve as simple chairs and are difficult to store. Furthermore, so-called paper chairs have a board-like structure, so they must be strong.

[0012] The technology according to this embodiment provides a simple chair that is strong, easy to carry, and easy to process, using standard board materials such as cardboard. This technology makes it possible to easily create a simple chair with excellent strength and portability without using special patterns, thereby improving convenience.

[0013] Fig. 1 is a perspective view showing the configuration of a chair 1 according to an embodiment of the present disclosure. Fig. 2 is a view of the configuration of the chair 1 according to an embodiment of the present disclosure as seen from the back. Fig. 3 is a view of the configuration of a leg 2 constituting the chair 1 according to an embodiment of the present disclosure as seen from the bottom.

[0014] As shown in FIG. 1, chair 1 according to this embodiment includes legs 2 and a seat 3. Legs 2 include a front portion 4 located at the front of chair 1, a rear portion 5 located at the rear of chair 1 facing front portion 4, and a pair of side portions 6A, 6B connecting front portion 4 and rear portion 5 in the circumferential direction of chair 1. Front portion 4, rear portion 5, and side portions 6A, 6B are all made of plate material. Such plate material may be, for example, cardboard such as corrugated cardboard, but is not particularly limited. From the standpoints of convenience and workability, chair 1 according to this embodiment is preferably one that can be formed from a single cardboard box (an example of a paper material).

[0015] The seat 3 comprises a seat surface 7 and a back surface 8. The back surface 8 stands upright from the seat surface 7. The back surface 8 is made up of a back surface 8A that corresponds to the backrest and back surface 8B and 8C that correspond to the armrests. The back surface 8B and 8C are formed from a single material from a pair of side surfaces 6A and 6B.

[0016] As will be described in detail later, the back surface portion 8 can be formed by bending a plate-like member. An extension (flap) of this bent plate-like member can form the seat surface portion 7.

[0017] Furthermore, as will be described in detail later, a belt-shaped member 9 may be provided on the seat portion 7 and the back portion 8. Such a belt-shaped member 9 has the function of fixing the seat portion 7 and the back portion 8 together. The belt-shaped member 9 is wrapped around the space between the legs 2 and the underside of the seat portion 7, the rear of the back portion 8A, and the upper side of the seat portion 7 in the front-to-rear direction of the chair 1, and is fixed along the seat portion 7 and the back portion 8.

[0018] As shown in FIG. 3 , the front portion 4 of the leg portion 2 has a shape that bends backward from the widthwise end toward the center. In other words, the center portion of the front portion 4 is bent so as to protrude backward. A fold 40 is formed in the widthwise center portion of the front portion 4. Furthermore, the rear portion 5 has a shape that bends forward from the widthwise end toward the center. In other words, the center portion of the rear portion 5 is bent so as to protrude forward. A fold 50 is formed in the widthwise center portion of the rear portion 5. The folds 40 and 50 are bonded together. There are no particular limitations on the means of bonding, and tape, adhesive, etc. can be used. There are no particular limitations on the bonding position of the folds 40 and 50 in the height direction, and it is sufficient that some or all of the folds 40 and 50 in the height direction are bonded together.

[0019] By bonding these folds together, the cross section of the legs 2 when viewed from the bottom is ribbon-like. This shape allows the buckling load in the height direction to be higher than that of a normal corrugated cardboard box (rectangular), increasing the load-bearing capacity. Furthermore, because the back portion 8B, 8C and the pair of side portions 6A, 6B of the seat portion 3 are formed from a single material, the legs 2 and seat portion 3 are integrated, improving bending resistance when leaning against the back portion 8. Furthermore, the integration of the legs 2 and seat portion 3 improves processability and portability.

[0020] 3 are located in the widthwise center of the front portion 4 and the rear portion 50, but there are no particular limitations on the location of the folds 40. If the folds 40 and 50 are located in the widthwise center, the load-bearing capacity can be improved.

[0021] Next, an example of a manufacturing method for the chair 1 according to this embodiment will be described with reference to FIGS. 4 to 18. First, in step S1 (see FIG. 4), a member 100 is prepared. The member 100 may be, for example, a cardboard box, as shown in FIG. 4. In this case, the front surface 200 (first side surface) of the member 100 may be larger than the other surfaces (i.e., the rear surface 300, the side surface 400, etc.). The rear surface 300 is an example of a second side surface, and the side surfaces 400 and 500 are an example of a pair of third side surface surfaces.

[0022] Next, in step S2 (see FIG. 5), the flaps on each side of the component 100 are unfolded. The flaps are formed by upper and lower flaps extending from the upper and lower ends (dotted lines in the figure) of the main surface of each side. In a typical cardboard box, such flaps constitute the top and bottom surfaces. The main surface 201 of the front surface 200 and the main surface 301 of the rear surface 300 are the same height. An upper flap 202 is provided at the top of the main surface 201, and a lower flap 203 (an example of a first lower flap) is provided at the bottom of the main surface 201. Furthermore, an upper flap 302 is provided at the top of the main surface 301, and a lower flap 303 (an example of a second lower flap) is provided at the bottom of the main surface 301.

[0023] Next, in step S3 (see FIG. 6), folds 600, 601 are made in the front portion 200 and the rear portion 300 along the up-down direction. These folds 600, 601 are made in a direction in which the front portion 200 and the rear portion 300 approach each other (i.e., a valley fold). In this folding process, the fold 600 is preferably made in the center of the width direction of the front portion 200. Similarly, the fold 601 is preferably made in the center of the width direction of the rear portion 300. This makes the ribbon-like structure shown in FIG. 3 symmetrical in the width direction, thereby increasing its strength.

[0024] Next, in step S4 (see FIG. 7), the portion above a predetermined length (here, length h, where h corresponds to the height of leg 2 and can be determined appropriately) from the lower end of main surface 201 of front surface portion 200 (i.e., the connection portion between main surface 201 and lower flap 203) is cut off from side surface portions 400 and 500. The cut-off portion is left as it is.

[0025] Next, in step S5 (see FIG. 8), a slit 701 is made in the width direction from the lower end of main surface 301 of rear portion 300 (i.e., the connection between main surface 301 and lower flap 303) at a position above the same length h as above, and a slit 702 is made along fold line 601 at a portion above height h. By forming these slits 701 and 702, main surface 301 and upper flap 302 of rear portion 300 open to the left and right. Main surface 301 and upper flap 302 that open to the left and right are referred to as main surface 301A and 301B, upper flap 302A, and upper flap 302B, respectively.

[0026] Next, in step S6 (see FIG. 9), the lower flaps of each surface portion are folded inward. The folded flaps may be folded, for example, so as to contact the main surface of each surface portion. Then, the main surfaces 401, 501 of the side surface portions 400, 500 are folded inward, respectively. The folding position may be, for example, half (x / 2) of the length (length x shown in FIG. 8) obtained by subtracting the position of the predetermined length h from the height of the main surfaces 401, 501, using a position a predetermined length h from the bottom end of the main surfaces 401, 501 of the side surface portions 400, 500 (i.e., the connection portion between the lower flaps 403, 503 and the main surfaces 401, 501) as the base point. By setting the folding position in this way, the top ends of the main surfaces 401, 501 (i.e., the connection position with the upper flaps 402, 502) overlap with the position of height h from the bottom end of the main surfaces 401, 501, making it easier to form the seating surface of the seating portion.

[0027] Next, in step S7 (see FIGS. 10(a) and 10(b)), fold 600 of main surface 201 and fold 601 of main surface 301 are adhered to each other. This adhesion may be achieved, for example, with gummed tape as shown in the figure, or by any other adhesion method. In this way, leg portion 2 is formed. Main surface 201 may constitute front portion 4, main surface 301 may constitute rear portion 5, and main surfaces 401 and 501 may constitute side portions 6A and 6B.

[0028] Next, in step S8 (see FIG. 11), the member 204 (an example of a cut member) cut off in step S4 is prepared. Then, in step S9 (see FIG. 12), the member 204 is cut into two along the longitudinal direction to obtain members 205A and 205B (an example of a second cut member). Then, in step S10 (see FIG. 13), the members 205A and 205B are aligned longitudinally, and their opposing ends are connected. The connection method is not particularly limited, and any adhesive means such as gummed tape can be used. The member obtained by the connection (an example of a third cut member) can be used as the belt-shaped member 9.

[0029] Next, in step S11 (see FIGS. 14(a) and 14(b)), first, the upper flaps 402 and 502 are placed on top of the seat 2 (the fixed portion), and the member 205 is sandwiched between the top of the seat 2 and the upper flaps 402 and 502. At this time, the member 205 is placed so that its longitudinal direction is the front-to-rear direction of the chair (i.e., the direction in which the front portion 200 and the rear portion 200 face each other). As shown in FIGS. 14(a) and 14(b), the longitudinal ends of the member 205 are placed so that they extend beyond the front-to-rear direction of the leg 2.

[0030] Next, in step S12 (see FIGS. 15(a) and 15(b)), the portion of member 205 protruding forward is folded so as to overlap the seat surface formed by upper flaps 402, 502. Then, in step S13 (see FIGS. 16(a) and 16(b)), main surfaces 301A, 301B are folded from the connection points with main surfaces 401, 501 of side portions 400, 500 as base points so that upper flaps 302A, 302B of the rear surface portion overlap the upper flaps 402, 502 that form the seat surface, with the connection points with main surfaces 301A, 301B forming a valley fold. In this way, main surfaces 301A, 301B, 401, 501 can form back surface 8 of chair 1 shown in FIG. 1.

[0031] Next, in step S14 (see FIGS. 17(a) and 17(b)), the portion of member 205 protruding rearward is bent along main surface 301, so that the end of member 205 forms part of seat portion 7. Then, in step S15 (see FIGS. 18(a) and 18(b)), member 205 is bonded to the portion of seat portion 7 along back surface 8 (8A) formed by main surface 301 (part B in the figure). The means for bonding member 205 to seat portion 7 is not particularly limited, but considering portability such as folding, as described below, fastening with detachable tape or the like is preferable. In this way, by wrapping band-shaped member 9 formed by member 205, the main surfaces and upper flaps constituting seat portion 3 can be more firmly fixed to each other, thereby improving the strength of chair 1. Note that band-shaped member 9 formed by member 205 is not essential, but providing it can provide a chair with greater strength.

[0032] Furthermore, the belt-shaped member 9 is a means for mechanically fastening the seat 3 of the chair 1. Therefore, for example, when folding the chair 1, the belt-shaped member 9 is removed, the chair is returned to the state of step S7 shown in Fig. 10, and the chair is folded into a small size by folding the chair in half along the creases extending in the vertical direction with the side portions 400, 500 protruding outward, then in half again along the vertical direction, again in half along the vertical direction, and finally in half along the horizontal direction. The use of such belt-shaped member 9 eliminates the need for irreversible fastening means such as adhesive between the legs 2 and the seat 3, making the chair highly portable.

[0033] As explained above, the chair 1 according to this embodiment is simple yet extremely strong, since each part is formed from a plate-like member, the legs 2 have a ribbon-like structure, and the widthwise sides of the legs 2 and the sides of the back 8 of the seat 3 are integrally formed. Furthermore, the chair 1 can be formed from a single cardboard box, making it easy to process. Furthermore, by using a reversible adhesive method to fix the structure of the seat 3, the chair is foldable and highly portable.

[0034] 19 to 21 are diagrams showing examples of chairs according to modifications of this embodiment. The diagrams shown in the vertical column of FIG. 19(a) show chairs according to a first modification, and the diagrams shown in the vertical column of FIG. 19(b) show chairs according to a second modification. Both chairs have a ribbon-like structure in which the front and rear central portions of the legs are bonded together, ensuring high strength as in the above embodiment. Furthermore, as shown in FIGS. 20 and 21, both chairs according to the modifications can be formed from a single cardboard box.

[0035] Finally, while various embodiments of the present disclosure have been described, they are presented as examples and are not intended to limit the scope of the invention. The novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. Such embodiments and modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as defined in the claims.

[0036] The following embodiments are also included in the scope of the present invention. (Item 1) A chair, It has legs and a seat, the leg portion has a plate-shaped front portion, a plate-shaped rear portion facing the front portion, and a pair of plate-shaped side portions connecting the front portion and the rear portion in a circumferential direction, The seat portion has a seat surface portion and a back surface portion standing upright from an end portion of the seat surface portion, The central portion of the front part is bent so as to protrude rearward, The central portion of the rear portion is bent so as to protrude forward, The front and rear portions are bonded together at the bent portion, The pair of side portions and the rear portion are formed from a single material. chair. (Item 2) The rear surface portion is formed by bending a plate-like member, The seat portion is formed by bending upward a portion extending from an end portion of the back portion opposite to the pair of side portions. Item 1. A chair as described in item 1. (Item 3) The chair further includes a belt-shaped member that is wrapped around the space between the legs and the underside of the seat, the rear of the back section, and the upper side of the seat in the front-rear direction, and is fixed along the seat and the back section. A chair according to item 1 or 2. (Item 4) The legs and the seat are formed from a single piece of paper material. A chair according to any one of items 1 to 3. (Item 5) The monolithic paper material is a corrugated cardboard box. A chair as described in item 4. (Item 6) A method for manufacturing a chair using a member, the member includes a first side surface portion, a second side surface portion facing the first side surface portion, and a pair of third side surface portions that connect end portions of the first side surface portion and the second side surface portion in a circumferential direction and face each other, the first side surface portion includes a first main surface and a first lower flap provided on a lower portion of the first main surface; the second side surface portion includes a second main surface having the same height as the first main surface, a second lower flap provided on a lower part of the second main surface, and an upper flap provided on an upper part of the second main surface; an area of ​​the first side surface portion is larger than an area of ​​each of the pair of third side surface portions; a folding process of folding the first side surface portion and the second side surface portion along the vertical direction and in a direction in which the first side surface portion and the second side surface portion approach each other; a first cutting step of cutting off a portion of the first side surface portion above a position of a first predetermined length from a lower end of the main surface of the first side surface portion from a connection portion of the pair of third side surface portions; a second cutting step of forming a slit in the width direction at a position of the first predetermined length from the connection portion between the second main surface and the second lower flap, and forming a slit along the fold above the slit in the upper second side surface portion; a fixing step of fixing the fold line in a portion of the first main surface from a connection portion with the first lower flap to a position of a first predetermined length and the fold line in a portion of the second main surface from a connection portion with the second lower flap to a position of the first predetermined length; a folding step of folding the pair of third side surface portions inward at a position above the first predetermined length, and forming the seat and back of the chair with the folded portions; A method for manufacturing a chair, comprising: (Item 7) each of the pair of third side surface portions includes a third main surface having the same height as the first main surface, a third lower flap provided on a lower part of the third main surface, and a second upper flap provided on an upper part of the third main surface; In the folding step, The folding positions of the pair of third side surface portions are set at a position half the length obtained by subtracting the position of the first predetermined length from the connection portion with the third lower flap from the height of the third main surface, with the position of the first predetermined length from the connection portion with the third lower flap as a base point. Item 6. A method for manufacturing a chair according to item 6. (Item 8) The cut member separated in the first step is divided into two second cut members along the longitudinal direction, the second cutting members are connected in a longitudinal direction to form a third cutting member; After the fixing step, the third cutting member is disposed on the upper part of the fixed portion, and in the disposed state, the longitudinal direction of the third cutting member is aligned with the direction in which the first side surface portion and the second side surface portion face each other; In the folding step, forming a seat surface by the second upper flap, and then folding a portion of the third cutting member that protrudes toward the first side surface portion so as to overlap the seat surface; the top flap further defines a seating surface above the folded portion; a portion of the third cutting member that protrudes toward the second side surface portion is bent so as to overlap the seat surface; Item 7. A method for manufacturing a chair according to item 7. (Item 9) In the folding process, The fold is provided at the center of the width of the first side surface portion and the second side surface portion. A method for manufacturing the chair according to any one of items 6 to 8. (Item 10) 10. The method for manufacturing a chair according to any one of items 6 to 9, wherein the member is a single piece of paper material. (Item 11) Item 11. The method for manufacturing a chair according to item 10, wherein the monolithic paper material is a cardboard box. [Explanation of symbols]

[0037] 1 chair 2 legs 3 Seat area 4 front 5 Rear 6 (6A, 6B) Side 7 Seat part 8 Back part 9. Belt-shaped member

Claims

1. A chair, It has legs and a seat, the leg portion has a plate-shaped front portion, a plate-shaped rear portion facing the front portion, and a pair of plate-shaped side portions connecting the front portion and the rear portion in a circumferential direction, The seat portion has a seat surface portion and a back surface portion standing upright from an end portion of the seat surface portion, The central portion of the front part is bent so as to protrude rearward, The central portion of the rear portion is bent so as to protrude forward, The front and rear portions are bonded together at the bent portion, The pair of side portions and the rear portion are formed from a single material. chair.

2. The rear surface portion is formed by bending a plate-like member, The seat portion is formed by bending upward a portion extending from an end portion of the back portion opposite to the pair of side portions.

2. The chair of claim 1.

3. The chair further includes a belt-shaped member that is wrapped around the space between the legs and the underside of the seat, the rear of the back section, and the upper side of the seat in the front-rear direction, and is fixed along the seat and the back section.

2. The chair of claim 1.

4. The legs and the seat are formed from a single piece of paper material.

2. The chair of claim 1.

5. The monolithic paper material is a corrugated cardboard box.

5. The chair of claim 4.

6. A method for manufacturing a chair using a member, the member includes a first side surface portion, a second side surface portion facing the first side surface portion, and a pair of third side surface portions circumferentially connecting end portions of the first side surface portion and the second side surface portion and facing each other, the first side surface portion includes a first main surface and a first lower flap provided on a lower portion of the first main surface; the second side surface portion includes a second main surface having the same height as the first main surface, a second lower flap provided on a lower part of the second main surface, and an upper flap provided on an upper part of the second main surface; an area of ​​the first side surface portion is larger than an area of ​​each of the pair of third side surface portions; a folding process of folding the first side surface portion and the second side surface portion along the vertical direction and in a direction in which the first side surface portion and the second side surface portion approach each other; a first cutting step of cutting off a portion of the first side surface portion above a position a first predetermined length from a lower end of the main surface of the first side surface portion from a connection portion of the pair of third side surface portions; a second cutting step of forming a slit in the width direction at a position of the first predetermined length from the connection portion of the second main surface with the second lower flap, and forming a slit along the fold above the slit in the upper second side surface portion; a fixing step of fixing the fold line in a portion of the first main surface from a connection portion with the first lower flap to a position of a first predetermined length and the fold line in a portion of the second main surface from a connection portion with the second lower flap to a position of the first predetermined length; a folding step of folding the pair of third side surface portions inward at a position above the first predetermined length to form a seat and a back of the chair with the folded portions; A method for manufacturing a chair, comprising:

7. each of the pair of third side surface portions includes a third main surface having the same height as the first main surface, a third lower flap provided on a lower part of the third main surface, and a second upper flap provided on an upper part of the third main surface; In the folding step, The folding positions of the pair of third side surface portions are, with the position of the first predetermined length from the connection portion with the third lower flap as a base point, a position that is half the length obtained by subtracting the position of the first predetermined length from the connection portion with the third lower flap from the height of the third main surface. A method for manufacturing the chair according to claim 6.

8. The cutting member separated in the first step is divided into two second cutting members along the longitudinal direction, the second cutting members are connected in a longitudinal direction to form a third cutting member; After the fixing step, the third cutting member is disposed on the upper part of the fixed portion, and in the disposed state, the longitudinal direction of the third cutting member is aligned with the direction in which the first side surface portion and the second side surface portion face each other; In the folding step, forming a seating surface by the second upper flap, and then folding a portion of the third cutting member that protrudes toward the first side surface portion so as to overlap the seating surface; the top flap further defines a seating surface above the folded portion; a portion of the third cutting member that protrudes toward the second side surface portion is bent so as to overlap the seat surface; A method for manufacturing the chair according to claim 7.

9. In the folding process, The fold is provided at a central portion in the width direction of the first side surface portion and the second side surface portion. A method for manufacturing the chair according to claim 6.

10. 7. The method of claim 6, wherein the member is a single piece of paper material.

11. The method for manufacturing a chair according to claim 10, wherein the monolithic paper material is a cardboard box.

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