Chair

Abstract

To realize a new foldable chair to be stacked by devising a structure while having a folding function.SOLUTION: A leg structure body 3 is constituted by performing connection between upper end parts 11g1, 21g1 and between 12g1, 22g1 of a pair of front and rear X-links 1, 2 by a pair of seat frames 41a, 42a so as to be synchronously openable. Then, a seat 5 is formed between the seat frames 41a, 42a in a development state. In the leg structure body 3, a part of an inner leg frame 3B between the right and left leg frames 3A, 3B of the chair is overlapped by fitting with the outer leg frame 3A between the right and left leg frames 3A, 3B of the other same adjacent chair constituted on a lower side of rotation shafts 33, 34 by the X-links 1, 2.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to Folded by bringing the ends of the legs close to each other, a chair.

Background Art

[0002] This type of chair has generally been known as an outdoor item.

[0003] Conventional folding chairs for outdoor use can be leaned against or laid flat when folded and stored in a vehicle or a warehouse.

[0004] For example, the folding chair described in Patent Document 1 has a structure in which the spaces between four columns are connected by X-links, and the four corners of the seat are attached to each column. When the four X-links are opened, it is in a use state, and when closed, it is in a folded state.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, for uses such as in an office rather than for camping and used indoors, it is not necessary to fold it so small. On the contrary, a certain degree of texture and stability is Yes, and it is easy to take in and out, desired.

[0007] Deleted

[0008] The present invention aims to achieve such From the perspective of, a new chair a purpose.

Means for Solving the Problems

[0009] To achieve such an object, the present invention takes the following measures.

[0010] That is, the chair of the present invention includes a pair of front legs or rear legs and a seat associated with these legs. The seat is folded by bringing the ends of the legs close to each other and becomes a substantially horizontal seatable state by separating them. It has a pair of left and right elbows that are located above the legs in the front-rear direction in the seatable state and the folded state, and a horizontally long backrest that connects the rear ends of the left and right elbows.

[0011] In this case, in the folded state, it is preferable to maintain a space for inserting a hand between the left and right elbows.

[0012] Also, the backrest and the seat are separated, and when transitioning from the seatable state to the folded state, it is preferable that the backrest or the seat move and deform in different directions from each other.

[0013] Also, the seat preferably changes its aspect in a substantially horizontal direction in the seatable state and in a substantially vertical direction in the folded state.

[0014] Also, in the folded state, it is preferable that the grounding portions of the opposing legs are separated from each other so that the chair can stand on its own.

[0015] Also, in the folded state, it is preferable that the front legs or rear legs of the leg structures of other identical chairs adjacent to the leg structure can enter and overlap.

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Effects of the Invention

[0022] According to the present invention described above, Folded by bringing the ends of the legs close to each other while having functions, by devising the structure Easy to take in and out a new folding chair can be provided.

Brief Description of the Drawings

[0023]

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Mode for Carrying Out the Invention

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0025] As shown in FIGS. 1 to 3, the folding chair X of this embodiment connects the front X link 1 and the rear X link 2 that form a pair back and forth so as to be synchronously opened and closed to form the leg structure 3, and forms the elbow 4 and the seat 5 on the upper end sides of the X links 1 and 2. In particular, the folding chair X of this embodiment has a self-standing function and a stacking function in the folded state.

[0026] Specifically, the front X-link 1 of the leg structure 3 includes an outer link member 11 located on the outer side in the opposing direction and an inner link member 12 located on the inner side. The rear X-link 2 of the leg structure 3 includes an outer link member 21 located on the outer side in the opposing direction and an inner link member 22 located on the inner side. The outer link members 11 and 21 are connected to be synchronously opened and closed by a grounding frame 31 extending in the front-rear direction between the lower end portions 11e1 and 21e1 to form an outer leg frame 3A, and the inner link members 12 and 22 are connected by a grounding frame 32 extending in the front-rear direction between the lower end portions 12e1 and 22e1 to form an inner leg frame 3B.

[0027] The outer link members 11 and 21 have a central straight portion 11a and 21a to which the rotation shafts 33 and 34 are attached, a lower first bent portion 11b and 21b located at the lower ends of the central straight portions 11a and 21a, an inclined portion 11c and 21c extending while gradually widening the distance between the front and rear links downward from the lower first bent portion 11b and 21b, a lower second bent portion 11d and 21d located at the lower ends of the inclined portions 11c and 21c, and a lower straight portion 11e and 21e extending while keeping the distance between the front and rear links constant downward from the lower second bent portion. The lower ends 11e1 and 12e1 of the straight portions 11e and 21e are continuous with the grounding frame 31. The lower first bent portions 11b and 21b and the lower second bent portions 11d and 21d are bent in the directions shown in FIGS. 5 and 8 in side view and do not appear in FIGS. 4 and 7 in front view. That is, the lower first bent portions 11b and 21b and the lower second bent portions 11d and 21d are bent in the direction of widening the front-rear grounding width WA of the outer leg frame 3A.

[0028] The inner link members 12 and 22 also include a central straight portion 12a and 22a to which the rotation shafts 33 and 34 are attached, a lower first bent portion 12b and 22b located at the lower ends of the central straight portions 12a and 22a, an inclined portion 12c and 22c extending while gradually widening the distance between the front and rear links downward from the lower first bent portions 12b and 22b, a lower second bent portion 12d and 22d located at the lower ends of the inclined portions 12c and 22c, and a lower straight portion 12e and 22e extending downward while maintaining a constant distance between the front and rear links from the lower second bent portions 12d and 22d. The lower ends 12e1 and 22e1 of the straight portions 12e and 22e are connected to the grounding frame 32. The lower first bent portions 12b and 22b and the lower second bent portions 12d and 22d are bent in a direction that does not appear in FIGS. 4 and 7 when viewed from the front but appears in FIGS. 5 and 8 when viewed from the side. That is, the lower first bent portions 12b and 22b and the lower second bent portions 12d and 22d are bent in a direction that widens the front and rear grounding widths WB of the inner leg frame 3B.

[0029] The rotation shaft 33 (34) is set at approximately the central portion in the longitudinal direction of the link members 11 and 12 (21 and 22) that constitute the X link 1 (2).

[0030] In the space S (stacking space S) of FIG. 1 surrounded by the outer leg frame 3A composed of the outer link members 11 and 21e and the grounding frame 31, when adjacent folding chairs X of the same type are adjacent to each other, the dimensions are set such that the inner leg frame 3B composed of the inner link members 12 and 22 of the adjacent folding chair X and the grounding frame 32 can pass through and fit (see FIG. 10). That is, in this regard, the leg structure 3 of this folding chair X has a left-right asymmetric structure at least in the relationship between the outer leg frame 3B and the inner leg frame 3B.

[0031] On the other hand, the outer link members 11 and 21 have an upper bent portion 11f and 21f located at the upper ends of the central straight portions 11a and 21a, and an upper straight portion 11g and 21g extending upward while maintaining a constant distance between the front and rear links from the upper bent portions 11f and 21f. The upper bent portions 11f and 21f are bent in a direction that does not appear in FIGS. 5 and 8 when viewed from the side but appears in FIGS. 4 and 7 when viewed from the front.

[0032] The inner link members 12 and 22 have upper bent portions 12f and 22f located at the upper ends of the central straight portions 12a and 22a, and upper straight portions 12g and 22g extending upward from the upper bent portions 12f and 22f while maintaining a constant distance between the front and rear links. The upper bent portions 12f and 22f are bent in the direction shown in FIGS. 4 and 7 when viewed from the front or in the direction shown on the back side, and do not appear in FIGS. 5 and 8 when viewed from the side.

[0033] The outer link member 11 and the inner link member 12 constituting the front X-link 1 are connected via a support shaft 31 at the central straight portions 11a and 12a, and the outer link member 21 and the inner link member 22 constituting the rear X-link 2 are connected via a support shaft 32 at the central straight portions 21a and 22a. The support shafts 31 and 32 have spacer portions 31a and 31b for securing a certain distance between the outer link member 11 (21) and the inner link member 12 (22) constituting the front X-link 1 (rear X-link 2) as shown in FIG. 5.

[0034] That is, by providing the upper bent portions 11f and 12f, when the front X-link 1 is closed as shown in FIGS. 6 and 7, the pair of upper straight portions 11g and 12g both stand vertically and are parallel in the front view. By providing the upper bent portions 21f and 22f, when the rear X-link 2 is closed as shown in FIGS. 6 and 7, the pair of upper straight portions 21g and 22g both stand vertically and are parallel in the front view.

[0035] On the other hand, as shown in FIGS. 3 and 11, the leg structure 3 connects between the upper end portions 11g1 and 21g1 of the pair of outer link members 11 and 21 with a circular elbow frame 41, and connects between the upper end portions 12g1 and 22g1 of the pair of inner link members 12 and 22 with a circular elbow frame 42. The lower frames 41a and 42a of the elbow frames 41 and 42 that extend in the front-rear direction are used as seat frames, and a stretching ground 51 is spanned between the seat frames 41a and 42a to form a seat 5.

[0036] As shown in FIG. 11, the lower frames 41a (42a) that function as seat frames integrally attach a pair of channel-shaped brackets 43, 43 (44, 44) at two locations on the front and rear sides of the lower end. The upper ends of the outer link members 11 (inner link members 12) are rotatably connected to these brackets 43 (44) by an axis m in the front-rear direction. As a result, the elbow frames 41, 42 are entirely rotatable around the axis m in the front-rear direction.

[0037] The elbow frames 41, 42 rotate inward to a position where they contact a stopper (not shown) and are temporarily held at positions on the upper extension lines of the respective link members that constitute the X-links 1, 2 during folding.

[0038] The seat fabric 51 that constitutes the seat 5 is made of a cloth material and is stretched between the left and right lower frames 41a, 42a in a state where the lower frames 41a, 42a that function as seat frames pass through the bag-shaped sewing parts 51a formed at the left and right edge parts.

[0039] As shown in FIGS. 3 and 11, the elbow frames 41, 42 form a circular shape connecting the lower frames 41a, 42a that function as seat frames, the upper frames 41b, 42b that function as elbow rests, and the front frames 41c, 42c and rear frames 41d, 42d located in front and behind these. By being integrated with the back and elbows in this way, a simple and structurally advantageous structure is achieved. Since the elbows are circular, the brackets 43, 44, which are the leg attachment parts, can be rationally arranged.

[0040] Incidentally, in the elbow frames 42 and 41 of this embodiment, as shown in FIG. 3, a gap CL is provided in the middle of the lower frame portions 41a and 42a that function as seat frames, and resin connection members 41a1, 41a2, 42a1, and 42a2 shown in FIG. 3 can be filled in this gap. For example, regarding the lower frame portion 42a shown in FIGS. 3 and 12, after passing the bag-shaped sewing portion 51a of the ground fabric 51 that constitutes the seat 5 through this gap CL into the lower frame portion 42a, the resin connection members 42a1 and 42a2 are fitted into the gap CL to cover the bag-shaped sewing portion 51a, thereby completing the attachment of the ground fabric 51a. The connection members 42a1 and 42a2 have inclined surfaces sl1 and sl2 that can be fitted together from the lateral direction, and protrusions pr1 and pr2 that fit into the inner diameter of the pipe member constituting the lower frame portion 42a are provided on the opposite surfaces. Then, after fitting the connection members 42a1 and 42a2 together, a screw f is passed through the screw insertion hole h provided in the connection member 42a1 and screwed into the screw hole n provided in the connection member 41a2 to fix it, thereby preventing detachment. The same applies to the connection member 42a1 in FIG. 3.

[0041] By doing so, the fabric can be sewn in advance to make the ground fabric 51, and the strength of the fabric and the workability of sewing can be improved. The elbow frames 41 and 42 can also ensure strength, and it is possible to avoid damaging the fabric of the ground fabric at the pipe end face.

[0042] Furthermore, as shown in FIGS. 1 to 3, in this embodiment, a backrest 6 is configured behind and above the elbow 4 and the seat 5. The backrest 6 is configured by stretching a ground fabric 63 between the left and right backrest frames 61 and 62, and the backrest frames 61 and 62 are integrally protruded upward from behind the elbow frames 41 and 42. The protruding direction is the direction in which the front frames 41c and 42c and the rear frames 41d and 41e extend in a front view, and is tilted backward from the direction in which the rear frames 41d and 42d extend in a side view.

[0043] On the other hand, the ground fabric 63 is made of a fabric, and is stretched between the left and right backrest frames 61 and 62 with the backrest frames 61 and 62 passed through the bag-shaped sewing portions 63a and 63a formed at the left and right edge portions.

[0044] Note that grounding members 35 are fitted from below at two locations, front and rear, of the grounding frames 31 and 32.

[0045] Also, R portions for smoothly connecting with the grounding frames 31 and 32 are formed at the lower ends 11e1, 21e1, 12e1, and 22e1 of the straight portions 11e, 21e, 12e, and 22e.

[0046] Next, the functions of this embodiment will be described.

[0047] First, as shown in FIG. 4, in the folding chair X of this embodiment, the upper bent portions 11f, 21f, 12f, and 22f are bent in a direction to widen the distance between the lower ends 11e1 and 12e1 (21e1 and 22e1) of the X-links 1 and 2. By operating the X-links 1 and 2, in the closed state until the upper straight portions 11g, 12g (21g, 22g) become substantially perpendicular and parallel to each other as shown in FIG. 7, the distance L1 between the lower ends 11e1 and 12e1 (21e1 and 22e1) is in a leg-opening state wider than the distance L2 between the upper ends 11g1 and 12g1 (21g1 and 22g1), and the folding chair X stands on its own.

[0048] At this time, the seating ground 51 of the seat 5 is folded into the predetermined gap L2 between the upper straight portions 11g and 21g (12g and 22g) so as to be folded in two at the center as shown in FIG. 8 as the X-links 1 and 2 are folded, thus not interfering with the opening and closing of the X-links 1 and 2.

[0049] Also, the backrest ground 63 of the backrest 6 also retracts behind the backrest frames 61 and 62 so as to be folded in two at the center as shown in FIG. 8 as the X-links 1 and 2 are opened and closed, thus not interfering with the opening and closing of the X-links.

[0050] Before and after the folding operation, first, a pair of elbow frames 41 and 42 are in an opposing position with a vertical posture in the unfolded state shown in FIG. 4, and by lifting the upper frame 41b (42b) that functions as an armrest, the elbow frames 41 and 42 maintain the vertical posture while the X-links 1 and 2 deform in the folding direction, and accordingly, while maintaining the opposing relationship, they approach each other from the state of FIG. 4 to the state of FIG. 7. By performing the reverse operation, they move from the state of FIG. 7 to the state of FIG. 4.

[0051] That is, the elbow frames 41 and 42 are also foldable / unfoldable along with the operation of the X-links 1 and 2.

[0052] As is prominent in the folded state of FIG. 6, the pair of elbow frames 41 and 42 are curved so that a maximum opposing gap Δ is formed in the middle part in a plan view.

[0053] Since the back frames 61 and 62 are on the upright extension lines of the front frames 41c and 42c and the rear frames 41d and 42d of the elbow frames 41 and 42 in a front view, the back frames 61 and 62 also approach each other while maintaining the opposing relationship as they shift from the unfolded state shown in FIG. 4 to the folded state shown in FIG. 7.

[0054] In the folded state shown in FIG. 7, the leg opening width L1 of the X-links 1 and 2 of this folding chair X is also wider than the distance L3 between the pair of elbow frames 41 and 42 and the distance L4 between the pair of back frames 61 and 61. In this regard, a stable self-standing state is also ensured.

[0055] Also, in the folding chair X of the present embodiment, among the leg structures 3 including the X-links 1 and 2, since the inner leg frame 3B of the folding chair X adjacent to the stacking space S of the outer leg frame 3A shown in FIG. 10 enters, as shown in FIG. 9, a part of the outer leg frame 3A constituting one of the chairs adjacent to each other on the left and right and the inner leg frame 3B constituting the other chair can be partially overlapped and horizontally stacked in the lateral direction.

[0056] Before and after stacking, as shown in Fig. 10, when the lower straight portions 12e and 22e of the inner leg frame 3B pass inside the lower straight portions 11e and 21e of the outer leg frame 3A, they can be brought into contact and guided, so that the insertion and removal can be performed smoothly.

[0057] As another function, in the states of Figs. 1, 2, and 4 where the X-links 1 and 2 are deployed, the tension balance between the stretching ground 51 of the seat 5 and the stretching ground 63 of the backrest 6 is adjusted so that the stretching ground 63 of the backrest 6 that forms the backrest 6 protrudes earlier than the stretching ground 51 that forms the seat 5 and serves as a stopper for the opening of the X-links 1 and 2.

[0058] That is, when the stretching ground 51 of the seat 5 is configured to stretch earlier than the stretching ground 63 of the backrest 6, when sitting, the stretching ground 51 of the seat 5 is pulled in the direction in which it bends, and the X-links 1 and 2 tend to close. When they tend to close, the stretching ground 63 of the backrest 6 becomes even looser and it becomes difficult to maintain the posture. In contrast, in this embodiment, the stretching ground 63 of the backrest 6 protrudes first in the most open state from the folded state, and the stretching ground 63 of the backrest 6 serves as a stopper for the opening of the X-links 1 and 2. At this time, the stretching ground 51 of the seat 5 is in a slightly loose state (not stretched). By doing so, an effect can be obtained that useless behavior is less likely to occur when sitting.

[0059] In this embodiment, as shown in Fig. 13, a document holder 7 is made detachable from the leg structure 3. This document holder 7 is made of a flexible material such as cloth, and cylindrical attachment portions 72 that can be opened and closed by hook-and-loop fasteners are provided on both sides of the document holder main body 71. The cylindrical attachment portions 72 are attached so as to span between the upper straight portions 11g and 21g of the outer leg frames 11 and 21. Since the upper straight portions 11g and 21g maintain parallelism with a predetermined distance L2 between them and the upper straight portions 12g and 22g when folded as shown in Fig. 7, the document holder 7 does not interfere with the folding. Of course, it is also possible to attach the document holder 7 between the upper straight portions 12g and 22g of the inner leg frames 12 and 22.

[0060] By doing so, when sitting, the document holder 7 will not get in the way and can be accessed from the side, making it easy to take in and out documents and the like. Also, it is possible to fold the folding chair X while it is attached, and even when the document holder 7 has a structure where the outlet opens upward as shown in the figure, when folded, the outlet faces upward, so even if an item such as a notebook computer PC is inserted, the item will not spill out and the attachment and detachment will be easy.

[0061] As described above, in the folding chair X of the present embodiment, the upper ends 11g1, 21g1 and 12g1, 22g1 between the pair of front and rear X-links 1, 2 are connected by a pair of seat frames 41a, 42a so as to be synchronously opened and closed to form the leg structure 3, and in a deployed state, a seat 5 is formed between the seat frames 41a, 42a. In the leg structure 3, a part of the inner leg frame 3B of the left and right leg frames 3A, 3B of the other same chair adjacent to the outer leg frame 3A, which is configured below the rotation axes 33, 34 by the X-links 1, 2, can enter and overlap.

[0062] In this way, since the present embodiment devises the direction of the asymmetric structure in consideration of the characteristics of the folding chair X, it is possible to effectively realize the stacking function also in the folding chair X.

[0063] Specifically, the pair of front and rear X-links 1, 2 each include an outer link member 11, 21 located on the outer side in the opposite direction and an inner link member 12, 22 located on the inner side. The outer link members 11, 21 connect the lower ends with the grounding frame 31 to form the outer leg frame 3A, and the inner link members 12, 22 connect the lower ends with the grounding frame 32 to form the inner leg frame 3B, and are configured such that the inner leg frame 3B of the adjacent chair enters inside the outer leg frame 3A.

[0064] In this way, by using the leg frames 3A, 3B having the connection frames 31, 32, the grounding state is stabilized, and the insertion and removal of the leg frames 3A, 3B before and after stacking can be performed smoothly.

[0065] In particular, each of the pair of outer link members 11, 21 and the pair of inner link members 12, 22 has inclined portions 11c, 21c, 12c, 22c that gradually increase the link - to - link distance downward from the rotation axes 33, 34, and the lower sides of the inclined portions 11c, 21c, 12c, 22c are connected to the grounding frames 31, 32 to form a structure.

[0066] In this way, due to the presence of the inclined portions 11c, 21c, 12c, 22c, the grounding width is increased, and the insertion and removal of the leg frames 3A, 3B before and after stacking can be performed more smoothly.

[0067] At this time, between the inclined portions 11c, 21c, 12c, 22c and the grounding frames 31, 32, there are straight portions 11e, 21e, 12e, 22e that keep the link - to - link distance constant downward from the inclined portions 11c, 21c, 12c, 22c. Therefore, the insertion and removal of the leg frames 3A, 3B before and after stacking can be performed even more smoothly.

[0068] When the outer link members 11(21) and the inner link members 12(22) of the X - link 1(2) open and close, the inclined portions 11c and 12c (21c and 22c) are most likely to interfere. In contrast, on the rotation axes 33, 34 that rotatably connect between the outer link members 11, 21 and the inner link members 12, 22, spacer portions 33a, 34a are provided to widen the intervals between the outer link member 11 and the inner link member 12, and between the outer link member 21 and the inner link member 22 along the opposing directions of the X - links 1, 2. By doing so, interference between the inclined portions can be avoided.

[0069] And in this embodiment, in the folded state, the lower - end portions 11e1, 12e1 (21e1, 22e1) of each X - link 1(2) are more open than the upper - end portions 11g1, 12g1 (21g1, 22g1), and when the upper - end portions 11g1, 12g1 (21g1, 22g1) are brought closer, the lower - end portions are likely to interfere with each other. Therefore, this structure is effective.

[0070] Particularly in this embodiment, in order to be able to stand on its own in the folded state, the lower ends 11e1, 12e1 (21e1, 22e1) of each of the X-links 1, 2 are open wider than the upper ends 11g1, 12g1 (21g1, 22g1). Therefore, the self-standing function and the stacking function can be suitably compatible with each other.

[0071] Also, since the elbow frames 41, 42 are provided so as to be foldable / unfoldable in conjunction with the folding / unfolding operation of the seat frames 41a, 42a, it is avoided that the elbows 4 interfere with stacking.

[0072] Furthermore, the back frames 61, 62 are respectively erected from the rear parts of the pair of elbow frames 41, 42, and a back 6 is provided between the pair of back frames 61, 62 so as to bend from the center along with the operation of the X-link. Thus, it is avoided that the back 6 interferes with stacking.

[0073] Also, the pair of link members 11, 12 (21, 22) constituting the X-link 1 (2) are bent above the rotation axes 33 (34), and straight portions 11g, 12g (21g, 22g) that are parallel to each other in the folded state are provided. Since the seat 5 is folded between the straight portions 11g, 12g (21g, 22g), it is avoided that the seat 5 interferes with stacking.

[0074] Furthermore, since the back 6 is folded at a position displaced from above the leg structure 3 in the folded state in the opposing direction of the front and rear X-links 1, 2, it is avoided that the back 6 interferes with stacking.

[0075] As described above, an embodiment of the present invention has been described. However, the specific configuration of each part is not limited to only the above-described embodiment.

[0076] For example, in the above embodiment, the extending direction of the front link or the rear link constituting the X-link is changed by the bent portion, but it can be similarly configured by a curved portion.

[0077] Moreover, even in a configuration without the lower straight line portion of the above-described embodiment, the stacking function and the self-standing function can be effectively realized.

[0078] Other configurations can also be variously modified without departing from the spirit of the present invention.

Explanation of Reference Numerals

[0079] X… Chair 3… Leg structure 4… Elbow 5… Seat 6… Back 11, 12... front legs (front link members) 21, 22... rear legs (rear link members)

Claims

1. A folding chair in which a leg structure is formed by connecting upper ends of a pair of front and rear X links by a pair of seat frames so as to be synchronously openable and closable, and a seat is formed between the seat frames in an unfolded state, This folding chair is characterized in that the leg structure is configured so that a part of either the left or right leg frame of an adjacent other identical chair can be inserted into or overlapped with either the left or right leg frame configured below the rotation axis by an X-link.

2. 2. The folding chair according to claim 1, wherein the pair of front and rear X links each include an outer link member located on the outside in the opposing direction and an inner link member located on the inside, the outer link members are connected at their lower ends by a ground frame to form an outer leg frame, the inner link members are connected at their lower ends by a ground frame to form an inner leg frame, and the inner leg frame of an adjacent chair is inserted inside the outer leg frame.

3. 3. The folding chair according to claim 2, wherein the pair of outer link members and the pair of inner link members each have an inclined portion that gradually widens the inter-link distance downward from the rotation axis, and the lower portion of the inclined portion is connected to the ground frame.

4. 4. The folding chair according to claim 3, further comprising a straight section between said inclined section and said ground frame, said straight section keeping the distance between said links constant downward from said inclined section.

5. 5. The folding chair according to claim 3, wherein a spacer portion is provided on a rotating shaft rotatably connecting the outer link member and the inner link member in a direction in which the X links face each other, to widen the gap between the outer link member and the inner link member.

6. 6. A folding chair according to claim 1, wherein in a folded state, the distance between the lower ends of each X link is greater than the distance between the upper ends.

7. 7. The folding chair according to claim 6, which is self-supporting in the folded state.

8. 8. The folding chair according to claim 1, wherein an arm frame is arranged to be foldable / unfoldable in conjunction with the folding / unfolding operation of the seat frame.

9. 9. A folding chair according to claim 8, wherein a back frame is erected from each of the rear ends of the pair of arm frames, and a back is provided between the pair of back frames so as to bend from the center in response to the operation of the X-link.

10. A folding chair according to any one of claims 1 to 9, wherein the pair of link members constituting the X-link are bent above the rotation axis to provide straight sections that are parallel to each other in the folded state, and the seat is folded between the straight sections.

11. 10. The folding chair according to claim 1, wherein the backrest is folded to a position displaced in the opposing direction of the front and rear X-links from above the leg structure in the folded state.

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