Folding chair

Abstract

To provide a foldable chair that has better overall load-bearing capacity and is conveniently stored when not in use.SOLUTION: A foldable chair includes two supporting side frames, two connecting plates, a seat cushion plate, and a back plate. The two supporting side frames each have a first supporting part and a second supporting part. The two connecting plates are arranged between the two supporting side frames. The seat cushion plate is arranged between the two first supporting parts, and the back plate is arranged between the two second supporting parts. An inner side of these components has at least one reinforcement structure. Each of the two connecting plates is foldable along a first folding line, the seat plate is foldable along a second folding line, and the back plate is foldable along a third folding line, such that a distance between the two supporting side frames is reduced.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a folding chair. More specifically, the present invention relates to a folding chair with better load-bearing capacity and more convenient storage after folding as its volume is reduced.

Background Art

[0002] Since chairs are very practical, they are widely used in various daily life scenarios as fixed furniture, for example. On the other hand, when setting up a temporary venue, relatively small and lightweight chairs have been developed to enhance mobility and achieve the effect of being easily transportable. However, all of the above chairs are fixed structures, occupy a certain volume, and can only be stored by stacking. Nevertheless, the effect of reducing the volume during storage is not significant enough, and it cannot be stored in a limited space any more, which is inconvenient. Compared with chairs manufactured by an integrally molded method, various folding chairs with convenience in carrying or transporting, reducing the occupied space for storage or accommodation, and improving the mobility required for use are commercially available. However, general folding chairs are often simply configured by combining or pivoting a plurality of plate bodies, and their overall strength is not enhanced by design. Therefore, the chair usually cannot provide stable support for the user to sit on.

Summary of the Invention

Problems to be Solved by the Invention

[0003] From the above, it is necessary to provide a folding chair with better overall load-bearing capacity and convenient storage when not in use.

Means for Solving the Problems

[0004] According to the present invention, there are provided two support side frames which are provided opposite to each other and in which a first support portion and a second support portion are respectively formed, two connection plates each having a first fold line formed therein, provided between the two support side frames, movably pivotally attached to the two support side frames, and foldable into a folded state by the first fold line, a seat cushion plate having a second fold line formed therein, provided between the two first support portions, movably pivotally attached to the two first support portions on both sides, and foldable into a folded state by the second fold line, and a back plate having a third fold line formed therein, provided between the two second support portions, movably pivotally attached to the two second support portions on both sides, and foldable into a folded state by the third fold line. The folding chair includes at least one of the two support side frames, the two connection plates, the seat cushion plate, and the back plate having a reinforcing structure formed on the inner side thereof. Each connection plate can be folded and folded along the first fold line so as to shorten the distance between the two support side frames. The seat cushion plate can be folded and folded along the second fold line, and the back plate can be folded and folded along the third fold line, thereby providing a folding chair.

[0005] In one embodiment, positioning posts are formed at the tops of the two connection plates, and positioning holes are formed in the seat cushion plate for the positioning posts. When the seat cushion plate and each connection plate are deployed, the positioning posts are inserted into the positioning holes for positioning.

[0006] In one embodiment, the connection plate includes a first plate body and a second plate body, and reinforcing structures are respectively formed on the inner sides of the first plate body and the second plate body.

[0007] In one embodiment, the seat cushion plate includes a first placement plate and a second placement plate, and reinforcing structures are respectively formed on the inner sides of the first placement plate and the second placement plate.

[0008] In one embodiment, the back plate includes a first support plate and a second support plate, and a reinforcing structure is formed inside each of the first support plate and the second support plate.

[0009] In one embodiment, at least one abutting portion extends and is formed from the back plate relative pivoting portion on each of the second support portions of the two support side frames, and when both sides of the back plate are movably pivoted to the two second support portions respectively, one side where the back plate is movably pivoted to the second support portion abuts against the abutting portion.

[0010] In one embodiment, the reinforcing structure further includes a plurality of reinforcing grids arranged in a honeycomb shape, a plurality of reinforcing rings formed within each of the plurality of reinforcing grids, and a plurality of reinforcing ribs connected between one inner wall of one of the plurality of reinforcing grids and one outer wall of one of the plurality of reinforcing rings respectively.

[0011] In one embodiment, through holes are formed in the reinforcing rings.

[0012] In one embodiment, each of the plurality of reinforcing grids has six grid ribs, is arranged in a hexagonal and honeycomb shape, each grid rib is simultaneously a common grid rib of two of the plurality of reinforcing grids, the plurality of reinforcing rings are all provided in a circular shape on the plurality of reinforcing grids, three adjacent reinforcing grids of the plurality of reinforcing grids have a common intersection point, the common intersection point is formed by three mutually intersecting grid ribs of the plurality of grid ribs, and one of the plurality of reinforcing ribs connects the common intersection point and one of the plurality of reinforcing rings along one direction of three mutually intersecting grid ribs.

[0013] In one embodiment, at least one anti-slip pad is provided at the bottom of the two support side frames and the two connection plates.

Advantages of the Invention

[0014] Like the above method, the folding chair itself has its overall load-bearing capacity enhanced through a structural reinforcement design, and its volume can be reduced by the folding method, which is convenient for storage when not in use.

[0015] To more clearly explain the technical solutions in the embodiments of the present application or the prior art, the drawings to be used in the description of the embodiments or the prior art are briefly described below. However, the drawings in the following description are only a part of the embodiments of the present application, and it is obvious that those skilled in the art can obtain other drawings from these drawings without creative efforts.

Brief Description of the Drawings

[0016]

Figure 1

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Figure 10

Modes for Carrying Out the Invention

[0017] The following description includes specific information related to exemplary embodiments of the present invention. The drawings and their detailed descriptions in the present invention are only exemplary embodiments. However, the present invention is not limited to these exemplary embodiments. Other variations and embodiments of the present invention will occur to those skilled in the art. Unless otherwise specified, similar or corresponding elements in the drawings may be denoted by similar or corresponding reference numerals. Also, the drawings and examples in the present invention are generally not to scale and are not intended to correspond to actual relative sizes.

[0018] For the sake of consistency and ease of understanding, similar features are denoted by reference numerals in the exemplary drawings (although in some examples this is not the case). However, features in different embodiments may differ in other respects and should not be narrowly limited to the features shown in the drawings.

[0019] Terms such as "at least one embodiment", "one embodiment", "a plurality of embodiments", "different embodiments", "some embodiments", "this embodiment", etc. may indicate that the embodiments of the present invention described in this way may include specific features, structures, or characteristics, but not all possible embodiments of the present invention must include specific features, structures, or characteristics. Also, repeated use of the phrases "in one embodiment" and "in this embodiment" does not necessarily refer to the same embodiment, even though they may be the same. Also, phrases such as "embodiment" used in relation to "the present invention" do not mean that all embodiments of the present invention must include specific features, structures, or characteristics, but should be understood that "at least some embodiments of the present invention" include the specific features, structures, or characteristics described. The term "coupled" is defined as a connection, whether directly or indirectly connected through intervening components, and is not necessarily limited to a physical connection. When the term "comprising" is used, it means "comprising, but not limited to", and clearly represents an open-ended inclusion or relationship of the described combinations, groups, series, and equivalents.

[0020] Also, for purposes of explanation and not limitation, specific details of functional entities, technologies, protocols, standards, etc. are described to provide an understanding of the described technology. In other instances, detailed descriptions of well-known methods, technologies, systems, and architectures are omitted so as not to obscure the description with unnecessary detail.

[0021] The terms "first", "second", "third", etc. in the specification and drawings of the present invention are used not to describe a particular order but to distinguish different articles. Also, the term "comprising" and all its variations are intended to include non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or modules is not limited to the listed steps or modules, and may further include steps or modules not selectively listed, or may further include other steps or modules specific to these processes, methods, products, or apparatuses.

[0022] The present invention will be described in further detail below in connection with the drawings and embodiments.

[0023] Referring to FIG. 1, the folding chair 10 shown in the figure includes two support side frames (101, 101'), two connection plates (102, 102'), a seat cushion plate 103, and a back plate 104. The two support side frames (101, 101') are provided opposite to each other. Each of the two connection plates (102, 102') has a first fold line 1021 formed thereon. The two connection plates (102, 102') are respectively provided between the two support side frames (101, 101') and are movably pivotally attached to the two support side frames (101, 101') respectively. The two connection plates (102, 102') can be bent into a folded state by the first fold line 1021. The seat cushion plate 103 has a second fold line 1031 formed thereon. The seat cushion plate 103 is provided between the two support side frames (101, 101'). Both sides of the seat cushion plate 103 are movably pivotally attached to the two support side frames (101, 101') respectively. The seat cushion plate 103 can be bent into a folded state by the second fold line 1031. The back plate 104 has a third fold line 1041 formed thereon. The back plate 104 is provided between the two support side frames (101, 101'). Both sides of the back plate 104 are movably pivotally attached to the two support side frames (101, 101') respectively. The back plate 104 can be bent into a folded state by the third fold line 1041.

[0024] Referring to FIGS. 2 and 3, the folding chair 10 includes two support side frames (101, 101'), two connection plates (102, 102'), a seat cushion plate 103, and a back plate 104. Each support side frame 101 is formed with a first support portion 1011, a second support portion 1012, a third support portion 1013, and a fourth support portion 1014. The first support portion 1011 is formed with at least one seat cushion plate relative pivoting portion 1015. The second support portion 1012 is formed with at least one back plate relative pivoting portion 1016. The third support portion 1013 and the fourth support portion 1014 are each formed with at least one connection plate relative pivoting portion 1017. A reinforcing structure 105 is formed inside the support side frame 101. Since the structure of the support side frame 101' is the same as that of the support side frame 101, it will not be described again here. At least one connection plate pivot fitting (1022, 1022') is formed on each side of the two connection plates (102, 102'). The two connection plates (102, 102') are movably pivoted to the connection plate relative pivoting portions (1017, 1017') of the third support portion (1013, 1013') and the fourth support portion (1014, 1014') of the two support side frames (101, 101') through the connection plate pivot fittings (1022, 1022') on both sides, so that the two connection plates (102, 102') are connected and installed between the third support portion (1013, 1013') and the fourth support portion (1014, 1014') of the two support side frames (101, 101').Also, in one embodiment, each connection plate (102, 102') includes a first plate body 1024 and a second plate body 1025. Reinforcement structures 105 are respectively formed inside the first plate body 1024 and the second plate body 1025. At least one plate body pivot fitting 1026 is formed on one side of the first plate body 1024. The second plate body 1025 has a plate body relative pivot fitting 1027 formed on one side with respect to the one side of the plate body pivot fitting 1026. The first plate body 1024 is movably pivotally attached to the plate body relative pivot fitting 1027 of the second plate body 1025 by the plate body pivot fitting 1026 so that the first plate body 1024 can be folded and folded with respect to the second plate body 1025. Connection plate pivot fittings (1022, 1022') are formed on one side of each of the first plate body 1024 and the second plate body 1025 with respect to the third support portion 1013 and the fourth support portion 1014. The first plate body 1024 and the second plate body 1025 can be movably pivotally attached to the connection plate relative pivot portion 1017 of the third support portion 1013 and the fourth support portion 1014 by the connection plate pivot fittings (1022, 1022'). Reinforcement structures 105 are respectively formed on the inner surfaces of the first plate body 1024 and the second plate body 1025. A reinforcement structure 105 is formed inside the seat cushion plate 103. The seat cushion plate 103 has at least one seat cushion plate pivot fitting 1032 respectively formed on both sides with respect to the two first support portions (1011, 1011'). The seat cushion plate 103 is movably pivotally attached to the seat cushion plate relative pivot portions (1015, 1015') of the two first support portions (1011, 1011') by the seat cushion plate pivot fittings 1032 on both sides so that the seat cushion plate 103 is connected and installed between the two first support portions (1011, 1011').In one embodiment, the seat cushion plate 103 includes a first placement plate 1034 and a second placement plate 1035. A reinforcing structure 105 is formed inside each of the first placement plate 1034 and the second placement plate 1035. At least one placement plate pivot fitting 1036 is formed on one side of the first placement plate 1034. At least one placement plate relative pivot fitting 1037 is formed on one side of the second placement plate 1035 facing the placement plate pivot fitting 1036. The first placement plate 1034 can be movably pivoted to the placement plate relative pivot fitting 1037 by the placement plate pivot fitting 1036 so that the first placement plate 1034 can be bent and folded relative to the second placement plate 1035. The seat cushion plate pivot fittings 1032 are formed on one side of the first placement plate 1034 and the second placement plate 1035 facing two first support portions (1011, 1011') respectively. The first placement plate 1034 and the second placement plate 1035 can be movably pivoted to the seat cushion plate relative pivot portions 1015 of the two first support portions (1011, 1011') by the seat cushion plate pivot fittings 1032 respectively. Also, handle holes 1038 are formed in the first placement plate 1034 and the second placement plate 1035 respectively. In one embodiment, positioning posts (1023, 1023') are formed at the tops of two connection plates (102, 102'). Positioning holes 1033 are formed in the seat cushion plate 103 for the positioning posts (1023, 1023'). When the seat cushion plate 103 and the two connection plates (102, 102') are deployed, the positioning posts (1023, 1023') can be inserted into the positioning holes 1033 so that the seat cushion plate 103 can be stably positioned on the two connection plates (102, 102') after being deployed.A reinforcing structure 105 is formed inside the back plate 104. At least one back plate pivot fitting 1042 is formed on each side of the back plate 104 with respect to both sides of the two second support parts (1012, 1012'). The two sides of the back plate 104 are movably pivoted to the back plate relative pivot parts (1016, 1016') of the two second support parts (1012, 1012') by the back plate pivot fittings 1042 respectively so that the back plate 104 is connected and installed between the two second support parts (1012, 1012'). In one embodiment, the back plate 104 includes a first support plate 1043 and a second support plate 1044. The reinforcing structure 105 is formed inside the first support plate 1043 and the second support plate 1044 respectively. At least one support plate pivot fitting 1045 is formed on one side of the first support plate 1043. At least one support plate relative pivot fitting 1046 is formed on one side of the second support plate 1044 facing the support plate pivot fitting 1045. The first support plate 1043 can be movably pivoted to the support plate relative pivot fitting 1046 by the support plate pivot fitting 1045 so that the first support plate 1043 can be folded and stacked with respect to the second support plate 1044. The back plate pivot fittings 1042 are formed on one side of the first support plate 1043 and the second support plate 1044 facing the two second support parts (1012, 1012') respectively. The first support plate 1043 and the second support plate 1044 can be movably pivoted to the back plate relative pivot part 1016 of the two second support parts (1012, 1012') by the back plate pivot fittings 1042 respectively so that the other sides of the first support plate 1043 and the second support plate 1044 are movably pivoted to the two second support parts (1012, 1012') respectively. In one embodiment, further, the manner in which the above components are combined is as shown in FIG. 1.

[0025] Referring to FIG. 4 and also referring to FIG. 3, first, for the purpose of explanation, a coordinate system with three-dimensional directions is defined. The three-dimensional directions are the X direction, the Y direction, and the Z direction respectively. Two of the three directions are perpendicular to each other. The X direction and the Y direction respectively represent the vertical direction and the horizontal direction on a plane of the same height, and the Z direction is defined as the height direction. As shown in FIG. 4, the two support side frames (101, 101') are provided relatively at intervals in the X direction. The pivoting portions of the first plate body 1024 and the second plate body 1025 of the two connection plates (102, 102') are further defined as the first fold line 1021. The first fold line 1021 extends generally along the Z direction. Thereby, the first plate body 1024 and the second plate body 1025 pivot relative to each other about the first fold line 1021, and the first plate body 1024 and the second plate body 1025 are folded, whereby the connection plates (102, 102') can be deformed from a flat plate shape to a double-folded shape. The seat cushion plate 103 is pivotally attached and configured by the first placement plate 1034 and the second placement plate 1035. A second fold line 1031 that extends generally along the Y direction is defined at the pivoting portion of the first placement plate 1034 and the second placement plate 1035. Thereby, the first placement plate 1034 and the second placement plate 1035 can pivot relative to each other about the second fold line 1031, and the seat cushion plate 103 is folded, whereby the seat cushion plate 103 can be deformed from a flat plate shape to a double-folded shape. Also, the back plate 104 is pivotally attached and configured by the first support plate 1043 and the second support plate 1044. A third fold line 1041 that extends generally along the Z direction is defined at the pivoting portion of the first support plate 1043 and the second support plate 1044. Thereby, the first support plate 1043 and the second support plate 1044 can pivot relative to each other about the third fold line 1041, and the back plate 104 is folded, whereby the back plate 104 can be deformed from a flat plate shape to a double-folded shape.

[0026] Furthermore, the first fold line 1021 of the two connection plates (102, 102') is located in the same plane (i.e., the Y-Z plane) as the second fold line 1031 of the seat cushion plate 103 and the third fold line 1041 of the back plate 104, and the distances from this plane to the two support side frames (101, 101') are equal. In other words, the positions of the two support side frames (101, 101') are symmetric to each other with respect to the plane formed by each fold line (1021, 1031, 1041). As described above, when folding the folding chair 10 of the present invention, it is necessary to apply a little force to bend each part, and the folding method is as follows. Apply force to each of the two connection plates (102, 102') along the first fold line 1021 (as shown by the arrow A in the figure) to fold the first plate body 1024 and the second plate body 1025, apply force to the seat cushion plate 103 along the second fold line 1031 (as shown by the arrow B in the figure) to fold the first placement plate 1034 and the second placement plate 1035, apply force to the back plate 104 along the third fold line 1041 (as shown by the arrow C in the figure) to fold the first support plate 1043 and the second support plate 1044, and move the two support side frames (101, 101') closer to each other along the X direction. As shown in FIG. 5, shorten the distance between the two support side frames (101, 101'), and finally deform the present invention from the chair form to the folded form shown in FIG. 5, thereby significantly reducing the occupied volume, so that more folded present inventions can be stored in the limited storage space. The force applied as described above mainly refers to the force applied towards the pivot part of each part or each fold line (1021, 1031, 1041) so that each part can be more easily bent and folded. Further referring to FIG. 5, since the first placement plate 1034 and the second placement plate 1035 of the seat cushion plate 103 are respectively formed with handle holes 1038, when the first placement plate 1034 and the second placement plate 1035 of the seat cushion plate 103 are folded, the two handle holes 1038 will approach each other, whereby the user can easily lift and move the folded folding chair 10 by hand.

[0027] Referring to FIG. 6, in one embodiment, the second support portions (1012, 1012') of the two support side frames (101, 101') are each formed by extending at least one abutting portion 1018 from the back plate relative pivoting portion 1016. When both sides of the back plate 104 are movably pivoted to the two second support portions (1012, 1012') respectively, one side where the back plate 104 is movably pivoted to the two support portions (1012, 1012') can be abutted against the abutting portion 1018, and the supporting force of the back plate 104 can be increased.

[0028] Referring to FIG. 7, the reinforcing structure further includes a plurality of reinforcing grids 1051 arranged in a honeycomb shape, a plurality of reinforcing rings 1052 formed within each of the plurality of reinforcing grids 1051, and a plurality of reinforcing ribs 1053 connected between one inner wall of each of the plurality of reinforcing grids 1051 and one outer wall of the plurality of reinforcing rings 1052. The strength of the entire reinforcing structure 105 can be enhanced by the reinforcing rings 1052 and the plurality of reinforcing ribs 1053. Further, the reinforcing ring 1052 can be further formed with through holes 1054 for increasing the strength of the reinforcing structure 105. Also, in one embodiment, each of the plurality of reinforcing grids 1051 has six grid ribs 10511, is arranged in a hexagonal and honeycomb shape, each grid rib 10511 is simultaneously a common grid rib of two of the plurality of reinforcing grids 1051, the plurality of reinforcing rings 1052 are all provided in the plurality of reinforcing grids 1051 in a circular shape, three adjacent reinforcing grids 1051 of the plurality of reinforcing grids 1051 have a common intersection point D, the common intersection point D is formed by three mutually intersecting grid ribs 10511 of the plurality of grid ribs 10511, and one of the plurality of reinforcing ribs 1053 is connected to the common intersection point D and a specific one of the plurality of reinforcing rings 1052 along a specific one of the directions of three mutually intersecting grid ribs 10511. In one embodiment, a specific one of the three mutually intersecting grid ribs 10511 is not located at a specific one of the plurality of reinforcing rings 1052, but a specific one of the three mutually intersecting grid ribs 10511 and a specific one of the plurality of reinforcing rings 1052 are joined at the common intersection point D. In one embodiment, the common intersection point D is also the intersection point of three mutually intersecting reinforcing ribs 1053 of the plurality of reinforcing ribs 1053. Therefore, the common intersection point D may be the common intersection point of a total of six ribs (three mutually intersecting grid ribs 10511 and three mutually intersecting reinforcing ribs 1053). Further, in one embodiment, the thickness of the reinforcing grid 1051 of the reinforcing structure 105 formed inside the two support side frames (101, 101') is 20 mm, the thickness of the reinforcing grid 1051 of the reinforcing structure 105 formed inside the seat cushion plate 103 is 12 mm, and the thickness of the reinforcing grid 1051 of the reinforcing structure 105 formed inside the back plate 104 is 5 mm.

[0029] Referring to FIG. 8, at the bottom of the two support side frames (101, 101') and the two connection plates (102, 102') of the folding chair 10 of the present invention, at least one anti-slip pad 106 having an anti-slip effect is provided, which can prevent the displacement of the entire seat due to the external force of the folding chair 10 during seating, and ensure the stability of the entire folding chair 10.

[0030] The following are the verification results after the reinforcement of the back plate and the seat cushion plate. Next, experiments were conducted using Embodiment 1 and Comparative Example 1. The actual sizes of Embodiment 1 and Comparative Example 1 are different. Specifically, it is defined that the unfolded size of Embodiment 1 is 430x325x755 (mm), and the unfolded size of Comparative Example 1 is defined as 500x420x997 (mm).

[0031] A pressure resistance experiment was conducted on the side plates of Embodiment 1 and Comparative Example 1 of the present invention. A weight of 38 Kgf was applied to the back plate of Embodiment 1 (i.e., the back plate 104 of the present invention is hereinafter referred to as the back plate 200) and the back plate 300 of Comparative Example 1, respectively, and the results analyzed by the computer aided engineering (CAE) simulation calculation method are shown in FIGS. 9(a) and 9(b).

[0032] The difference between the back plate 300 of Comparative Example 1 and the back plate 200 of Embodiment 1 is that the back plate 300 does not include the reinforcing ring, a plurality of reinforcing ribs, and the contact portions of the two support side frames included in the reinforcing structure of the present invention.

[0033] Table 1 shows the maximum deformation values obtained in Embodiment 1 and Comparative Example 1.

Table 1

[0034] As can be seen from Table 1, since the maximum deformation value of the back plate 300 in Comparative Example 1 is 2.6 times the maximum deformation amount of the back plate 200 in Embodiment 1, it can be understood that in Embodiment 1, compared with Comparative Example 1, the maximum deformation value of the back plate 200 has decreased, and the pressure resistance has been effectively improved.

[0035] A pressure resistance experiment was conducted on the sheet cushion plates of Embodiment 1 and Comparative Example 1 of the present invention. A weight of 132 Kgf was applied to the sheet cushion plate 400 (i.e., the sheet cushion plate 103 of the present invention will be hereinafter referred to as the sheet cushion plate 400) in Embodiment 1 and the sheet cushion plate 500 in Comparative Example 1, respectively, and the results analyzed by the CAE simulation calculation method are shown in FIGS. 10(a) and 10(b).

[0036] The difference between the sheet cushion plate 500 in Comparative Example 1 and the sheet cushion plate 400 in Embodiment 1 is that the sheet cushion plate 500 does not include the reinforcing ring and the plurality of reinforcing ribs included in the reinforcing structure of the present invention.

[0037] Table 2 shows the maximum deformation values obtained in Embodiment 1 and Comparative Example 1.

Table 2

[0038] As can be seen from Table 2, since the maximum deformation value of the sheet cushion plate 500 in Comparative Example 1 is 2.61 times the maximum deformation amount of the sheet cushion plate 400 in Embodiment 1, it can be understood that in Embodiment 1, compared with Comparative Example 1, the maximum deformation value of the sheet cushion plate 400 has decreased, and the pressure resistance has been effectively improved.

[0039] According to the above description, the concepts described in the present application can clearly be realized using various techniques as long as they do not deviate from the scope of these concepts. Also, although the concepts have been described with specific reference to certain embodiments, those skilled in the art will recognize that the form and details can be changed as long as they do not deviate from the scope of these concepts. Thus, the described embodiments are to be understood as illustrative in all respects and not restrictive. Also, it should be understood that the present application is not limited to the specific embodiments described above, and many rearrangements, modifications, and substitutions are possible without departing from the scope of the invention.

Explanation of Reference Numerals

[0040] 10: Folding chair 101: Support side frame 101’: Support side frame 1011: First support portion 1011’: First support portion 1012: Second support portion 1012’: Second support portion 1013: Third support portion 1013’: Third support portion 1014: Fourth support portion 1014’: Fourth support portion 1015: Seat cushion plate relative pivoting portion 1015’: Seat cushion plate relative pivoting portion 1016: Back plate relative pivoting portion 1016’: Back plate relative pivoting portion 1017: Connection plate relative pivoting portion 1017’: Connection plate relative pivoting portion 1018: Contact portion 102: Connection plate 102’: Connection plate 1021: First fold line 1022: Connection plate pivot 1022’: Connection plate pivot 1023: Positioning post 1023’: Positioning post 1024: First plate body 1025: Second plate body 1026: Plate body pivot fitting 1027: Plate body relative pivot fitting 103: Seat cushion plate 1031: Second fold line 1032: Seat cushion plate pivot fitting 1033: Positioning hole 1034: First mounting plate 1035: Second mounting plate 1036: Mounting plate pivot fitting 1037: Mounting plate relative pivot fitting 1038: Handle hole 104: Back plate 1041: Third fold line 1042: Back plate pivot fitting 1043: First support plate 1044: Second support plate 1045: Support plate pivot fitting 1046: Support plate relative pivot fitting 105: Reinforcing structure 1051: Reinforcing lattice 10511: Lattice rib 1052: Reinforcing ring 1053: Reinforcing rib 1054: Through hole 106: Anti-slip pad A: Biasing direction B: Biasing direction C: Biasing direction D: Common intersection point

Claims

1. Two support side frames provided opposite to each other and each formed with a first support portion and a second support portion, Two connection plates each formed with a first fold line, provided between the two support side frames, movably pivotally attached to the two support side frames, and foldable into a folded state by the first fold line, A seat cushion plate formed with a second fold line, provided between the two first support portions, movably pivotally attached to the two first support portions on both sides, and foldable into a folded state by the second fold line, A back plate formed with a third fold line, provided between the two second support portions, movably pivotally attached to the two second support portions on both sides, and foldable into a folded state by the third fold line, a folding chair comprising: A reinforcing structure is formed on the inner side of at least one of the two support side frames, the two connection plates, the seat cushion plate, and the back plate, and the reinforcing structure includes a plurality of reinforcing grids arranged in a honeycomb shape, a plurality of reinforcing rings formed in each of the plurality of reinforcing grids, and a plurality of reinforcing ribs connected between one inner wall of one of the plurality of reinforcing grids and one outer wall of one of the plurality of reinforcing rings, So as to shorten the distance between the two support side frames, each connection plate can be folded and folded along the first fold line, the seat cushion plate can be folded and folded along the second fold line, and the back plate can be folded and folded along the third fold line Folding chair.

2. The connection plate includes a first plate body and a second plate body, and the reinforcing structure is formed on the inner sides of the first plate body and the second plate body respectively The folding chair according to Claim 1.

3. The seat cushion plate includes a first placement plate and a second placement plate, and the reinforcing structure is formed on the inner sides of the first placement plate and the second placement plate respectively The folding chair according to Claim 1.

4. The back plate includes a first support plate and a second support plate, and the reinforcing structure is formed on the inner sides of the first support plate and the second support plate respectively The folding chair according to Claim 1.

5. The second support portions of the two support-side frames are each formed by extending at least one abutting portion from a back plate relative pivoting portion. When both sides of the back plate are movably pivoted to the two second support portions respectively, one side where the back plate is movably pivoted to the second support portion abuts against the abutting portion. The folding chair according to claim 1.

6. A through hole is formed in the reinforcing ring. The folding chair according to claim 1.

7. Each of the plurality of reinforcing grids has six grid ribs and is arranged in a hexagonal and honeycomb shape. Each of the grid ribs is simultaneously a common grid rib of two of the plurality of reinforcing grids. The plurality of reinforcing rings are all provided in a circular shape on the plurality of reinforcing grids. Three adjacent reinforcing grids among the plurality of reinforcing grids have a common intersection point, and the common intersection point is formed by three mutually intersecting grid ribs among the plurality of grid ribs. One of the plurality of reinforcing ribs connects the common intersection point and one of the plurality of reinforcing rings along one direction of one of the three mutually intersecting grid ribs. The folding chair according to claim 1.

8. At least one anti-slip pad is provided at the bottom of the two support-side frames and the two connection plates. The folding chair according to claim 1.

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