Folding chair

Abstract

The utility model relates to a folding chair. The folding chair comprises a seat frame; a first leg; the base is rotationally connected with the front side of the seat frame; the second supporting leg is rotationally connected with the rear side of the seat frame and is provided with a first connecting part which convexly extends towards the upper part of the seat frame; one end of the backrest frame is rotationally connected with the first connecting part; the folding chair comprises an opening state and a folding state, when the folding chair is in the opening state, the first supporting leg and the second supporting leg support the seat frame, and an included angle is formed between the backrest frame and the seat frame; when the folding chair is switched from the unfolded state to the folded state, the second supporting leg and the backrest frame are rotationally folded in the direction close to the seat frame in the opposite directions, and the first supporting leg and the second supporting leg are rotationally folded in the direction close to the seat frame in the opposite directions. Thus, after the folding chair is rotated and folded, most of the structures of the first supporting leg, the second supporting leg and the backrest frame are stacked with the seat frame, even if the backrest frame is lengthened, the overall size of the folding chair in a folded state is not very large, and the storage convenience is improved.

Description

Technical Field

[0001] This application relates to the field of seating technology, and in particular to a folding chair. Background Technology

[0002] Folding chairs, as a type of lightweight and foldable seating, have been widely used in people's daily lives. Folding chairs are easy to move and save space.

[0003] To improve the comfort of folding chairs, some technologies extend the backrest so that users can rest their heads on it. However, this increases the overall size of the folding chair when it is folded up for storage. Utility Model Content

[0004] Therefore, it is necessary to provide a folding chair that addresses the issue of increased overall size when folding and storing a folding chair with an extended backrest.

[0005] A folding chair, comprising:

[0006] Frame;

[0007] The first leg; rotatably connected to the front of the seat frame;

[0008] The second leg is rotatably connected to the rear side of the seat frame and has a first connecting portion protruding upwards towards the seat frame; and

[0009] The backrest frame is rotatably connected at one end to the first connecting part;

[0010] The folding chair has an open state and a folded state. When the folding chair is in the open state, the first leg and the second leg support the seat frame, and the backrest frame and the seat frame are set at an angle. When the folding chair switches from the open state to the folded state, the second leg and the backrest frame rotate and fold towards each other in the direction closer to the seat frame, and the first leg and the second leg rotate and fold towards each other in the direction closer to the seat frame.

[0011] In one embodiment, the first leg has a hole formed under the seat frame, and when the folding chair switches from the open state to the folded state, the end of the second leg facing away from the first connecting part extends into the hole.

[0012] In one embodiment, the rear side of the seat frame is also provided with a protruding limiting part. When the folding chair is in the open state, the limiting part can abut against one end of the backrest frame to restrict the backrest frame from rotating relative to the seat frame, and the first connecting part forms a triangular structure with the seat frame and the backrest frame.

[0013] In one embodiment, the folding chair further includes a connecting rod, one end of which is connected to the connection between the first leg and the seat frame and is rotatably connected to both the first leg and the seat frame, and the other end of which is rotatably connected to the backrest frame.

[0014] When the folding chair is in the open position, the connecting rod forms a triangular structure with the seat frame and backrest frame.

[0015] In one embodiment, the first leg also has a second connecting portion protruding upward toward the seat frame, and the folding chair also includes an armrest, the two ends of which are rotatably connected to the backrest frame and the second connecting portion, respectively.

[0016] In one embodiment, when the folding chair is in the open state, the angle between the backrest frame and the second leg is greater than 90 degrees and less than 180 degrees.

[0017] In one embodiment, when the folding chair is in the open position, the first leg bends and extends away from the seat frame toward the second leg; and / or the second leg bends and extends toward the first leg toward the seat frame.

[0018] In one embodiment, the frame is U-shaped, and the open end of the frame is located at the front side of the frame; and / or

[0019] The first leg is U-shaped, with the open end of the first leg facing the base frame; and / or

[0020] The second leg is U-shaped, with its open end facing the base frame; and / or

[0021] The backrest frame is U-shaped, with the open end of the backrest frame facing the seat frame.

[0022] In one embodiment, the backrest frame includes a backrest and a pillow portion, the pillow portion being connected to the end of the backrest away from the second leg.

[0023] In one embodiment, the first leg has a hole formed under the seat frame, and the folding chair also includes a reinforcing rod located at the hole, with both ends fixedly connected to the first leg.

[0024] The aforementioned folding chair folds with the second leg and backrest frame facing each other towards the seat frame, and the first leg and second leg facing each other towards the seat frame. Therefore, after folding, most of the structure of the first leg, second leg, and backrest frame is stacked with the seat frame. Even with an extended backrest frame, the overall size of the folding chair in the folded state is not very large, improving storage convenience. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the folding chair in the open state in some embodiments of this application.

[0026] Figure 2 for Figure 1The diagram shows the structure of the folding chair switching from the open state to the folded state.

[0027] Figure 3 for Figure 1 The diagram shows another state of the folding chair during the process of switching from the open state to the folded state.

[0028] Figure 4 for Figure 1 The diagram shows the structure of the folding chair in its folded state.

[0029] Figure 5 for Figure 1 The diagram shows an enlarged view of part of the structure of the folding chair in its non-open state.

[0030] Figure 6 for Figure 1 The diagram shows an enlarged view of part of the structure of the folding chair in its open state.

[0031] Explanation of reference numerals in the attached figures:

[0032] Folding chair 100, seat frame 10, limiting part 11, first leg 20, first leg part 21, second leg 22, second connecting part 23, second leg 30, first connecting part 31, third leg 32, fourth leg 33, backrest frame 40, backrest 41, pillow part 42, seat cloth 50, backrest cloth 60, headrest 70, reinforcing rod 80, connecting rod 90, armrest piece 95, anti-slip foot pad 98. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0039] As mentioned in the background section, folding chairs typically have two states: open and folded. When the folding chair is in the open state, it can be used by users to sit and lean on it, just like a regular seat. When the folding chair is in the folded state, the entire folding chair can be flat, so that users can stack it in a corner, in a cabinet, or in a car.

[0040] To improve the comfort of folding chairs, some technologies extend the backrest so that the user's head can rest on it. This increases the length of the folding chair in its folded state, making the overall size of the chair larger and causing inconvenience in storage.

[0041] Based on the above, this application provides a folding chair that can reduce the overall size of the folding chair in the folded state and improve the convenience of storage.

[0042] Figure 1 This is a schematic diagram of the folding chair in the open state in some embodiments of this application. Figure 2 for Figure 1 The diagram shown illustrates the structural process of a folding chair switching from an open to a folded state. Figure 3 for Figure 1 The diagram shown illustrates another state of the folding chair during the transition from the open to the folded state. Figure 4 for Figure 1 The diagram shows the folding chair in its folded state. (See attached image.) Figures 1-4 The folding chair 100 provided in one embodiment of this application includes a seat frame 10, a first leg 20, a second leg 30, and a backrest frame 40. The seat frame 10 is used to support the user's buttocks, the first leg 20 and the second leg 30 jointly support the seat frame 10, and the backrest frame 40 is used to support the user's back or back and head.

[0043] Specifically, the first leg 20 is rotatably connected to the front side of the seat frame 10, the second leg 30 is rotatably connected to the rear side of the seat frame 10, and has a first connecting portion 31 protruding upwards from the seat frame 10. One end of the backrest frame 40 is rotatably connected to the first connecting portion 31. Since the backrest frame 40 is connected to the first connecting portion 31 of the second leg 30, and the second leg 30 is connected to the rear side of the seat frame 10, the front side of the seat frame 10 is the side away from the backrest frame 40.

[0044] The folding chair 100 includes an open state and a folded state. When the folding chair 100 is in the open state, the first leg 20 and the second leg 30 support the seat frame 10, and the backrest frame 40 is set at an angle to the seat frame 10. That is, when the folding chair 100 is opened, the first leg 20 and the second leg 30 can support the seat frame 10, so that the seat frame 10 can be stably supported on the ground, and a sitting space can be formed between the backrest frame 40 and the seat frame 10 for the user to sit back. Specifically, the angle between the backrest frame 40 and the seat frame 10 is greater than or equal to 90 degrees and less than 180 degrees. In this way, the user's back can be tilted back on the backrest frame 40 to provide a more comfortable sitting condition.

[0045] When the folding chair 100 switches from the open state to the folding state, the second leg 30 and the backrest frame 40 rotate and fold towards each other in the direction closer to the seat frame 10, and the first leg 20 and the second leg 30 rotate and fold towards each other in the direction closer to the seat frame 10.

[0046] It can be understood that the second leg 30 and the backrest frame 40 rotating and folding towards each other and closer to the seat frame 10 means that the main body of the second leg 30 (excluding the first connecting part 31) and the backrest frame 40 rotating and folding towards each other and closer to the seat frame 10. Specifically, when the folding chair 100 is in the open state, the main body of the backrest frame 40 and the second leg 30 are located on the upper and lower sides of the seat frame 10, respectively. Therefore, when the folding chair 100 switches from the open state to the folding state, the main body of the second leg 30 can rotate and fold towards the lower side of the seat frame 10, while the backrest frame 40 can rotate and fold towards the upper side of the seat frame 10, so that the main body of the second leg 30 and the backrest frame 40 rotate and fold towards each other and closer to the seat frame 10.

[0047] The first leg 20 and the second leg 30 rotating and folding towards each other toward the seat frame 10 means that the main body of the first leg 20 (excluding the other parts of the second connecting part 21 described below) and the main body of the second leg 30 rotating and folding towards each other toward the seat frame 10. Specifically, when the folding chair 100 is in the open state, the main body of the first leg 20 and the main body of the second leg 30 are both located on the lower side of the seat frame 10. Therefore, when the folding chair 100 switches from the open state to the folding state, the active part of the first leg 20 can rotate and fold toward the lower side of the seat frame 10, and the main body of the second leg 30 can rotate and fold toward the lower side of the seat frame 10, so that the main body of the first leg 20 and the main body of the second leg 30 rotate and fold towards each other toward the seat frame 10.

[0048] Therefore, in the folding chair 100 of this application embodiment, since the second leg 30 and the backrest frame 40 rotate and fold towards each other in the direction closer to the seat frame 10, and the first leg 20 and the second leg 30 rotate and fold towards each other in the direction closer to the seat frame 10, after rotation and folding, most of the structure of the first leg 20, the second leg 30, and the backrest frame 40 are stacked with the seat frame 10. Even if the backrest frame 40 is lengthened, the overall size of the folding chair 100 in the folded state will not be very large, thus improving the convenience of storage.

[0049] Please see Figure 1Specifically, in the embodiments of this application, the seat frame 10 is U-shaped, and the open end of the seat frame 10 is located on the front side of the seat frame 10. Since the seat frame 10 is U-shaped as a whole, and the open end is located on the front side of the seat frame 10, when the user sits on the seat frame 10, the open end of the seat frame 10 is below the knees. Therefore, the user's legs do not come into contact with the support on the seat frame 10, thus improving comfort.

[0050] Furthermore, the folding chair 100 also includes a seat fabric 50 fitted onto the seat frame 10. The seat fabric 50 forms a seat surface that directly contacts the user's buttocks. When engaged with the seat frame 10, the seat fabric 50 remains unfolded to reliably support the user's buttocks. In other embodiments, a woven mesh may be provided on the seat frame 10, the seat frame 10 may be directly set as a flat plate, or the seat frame 10 may be set by combining multiple supports to form a seat surface to support the user's buttocks.

[0051] In some embodiments, the first leg 20 is also U-shaped, with its open end facing the base 10. This allows the closed end of the first leg 20, opposite the open end, to rest on the ground, increasing the support area between the first leg 20 and the ground and improving the reliability of the support.

[0052] Specifically, the first leg 20 includes a first leg 21 and a second leg 22 disposed opposite to each other. One end of the first leg 21 and the second leg 22 forms an open end, and the two sides of the seat frame 10 are rotatably connected to the first leg 21 and the second leg 22 respectively.

[0053] In some embodiments, the second leg 30 is also U-shaped, with its open end facing the base 10. This allows the closed end of the second leg 30, opposite the open end, to rest on the ground, increasing the support area between the second leg 30 and the ground and improving the reliability of the support.

[0054] Specifically, the second leg 30 includes a third leg 32 and a fourth leg 33 arranged opposite to each other. One end of the third leg 32 and the fourth leg 33 forms an open end, and the two sides of the seat frame 10 are rotatably connected to the third leg 32 and the fourth leg 33, respectively.

[0055] In some embodiments, the backrest frame 40 is U-shaped, with its open end facing the seat frame 10. Thus, the closed end of the backrest frame 40, opposite the open end, allows the user's head to rest against it, improving the comfort of the backrest frame 40.

[0056] Furthermore, the folding chair 100 also includes a backrest fabric 60 fitted onto the backrest frame 40. The backrest fabric 60 forms a backrest surface that directly contacts the user's back. When engaged with the backrest frame 40, the backrest fabric 60 remains unfolded to reliably support the user's back. In other embodiments, a woven mesh may be provided on the backrest frame 40, the backrest frame 40 may be directly made into a flat plate, or the backrest frame 40 may be composed of multiple supports forming the backrest surface to support the user's back.

[0057] It should be noted that since the backrest frame 40 is U-shaped and matches the backrest fabric 60, there is no crossbar inside the backrest frame 40. During use, the user's back will not be obstructed by the crossbar and will not feel any discomfort. It will only contact the backrest fabric 60, which improves comfort.

[0058] In some embodiments, the backrest frame 40 includes a backrest 41 and a pillow portion 42, the pillow portion 42 being connected to the end of the backrest 41 away from the second leg 30.

[0059] The backrest 41 provides support for the user's back, while the headrest 42 provides support for the user's head. The backrest fabric 60 can be fitted onto the backrest 41.

[0060] Furthermore, the folding chair 100 also includes a headrest 70, which is located on the pillow portion 42. The headrest 70 can be fixed to the backrest frame 40 or detachably connected to the backrest frame 40. The headrest 70 allows the user's head to rest against it, improving comfort. Optionally, the pillow portion 42 and the backrest 41 are arranged at an angle; specifically, the pillow portion 42 is tilted backward relative to the backrest 41 at a certain angle. This allows the user's head to tilt back comfortably, further enhancing the comfort of the headrest.

[0061] In specific embodiments of this application, the seat frame 10, the first leg 20, the second leg 30, and the backrest frame 40 are all U-shaped. In other embodiments, at least two of the seat frame 10, the first leg 20, the second leg 30, and the backrest frame 40 may be U-shaped, and there are no specific limitations.

[0062] Combination Figures 1-3 In some embodiments, the first leg 20 has a hole A formed below the seat frame 10. When the folding chair 100 switches from the open state to the folded state, the end of the second leg 30 facing away from the first connecting part 31 extends into the hole A.

[0063] When the folding chair 100 switches from the open state to the folded state, the first leg 20 and the second leg 30 rotate toward the seat frame 10. Since one end of the second leg 30 can be inserted through the hole A of the first leg 20 located below the seat frame 10, the positional interference between the first leg 20 and the second leg 30 during the rotation is avoided, allowing the first leg 20 and the second leg 30 to overlap each other during the folding process, further reducing the overall size of the folding chair 100 in the folded state.

[0064] Alternatively, hole A can be a through hole formed when the first leg 20 is U-shaped.

[0065] Optionally, the rotatable connection between the first leg 20 and the seat frame 10 is located on the outer side of the seat frame 10, while the rotatable connection between the second leg 30 and the seat frame 10 is located on the inner side of the seat frame 10. This reduces positional interference and facilitates the insertion of the second leg 30 through the hole A. Furthermore, since the first leg 20 is connected to the front of the seat frame 10, and the front of the seat frame 10 typically has a support structure such as a seat fabric 50, placing the rotatable connection between the first leg 20 and the seat frame 10 on the outer side of the seat frame 10 reduces the impact on the inner support structure of the seat frame 10. The second leg 30 is connected to the rear of the seat frame 10, and typically does not require a support structure such as a seat fabric 50. Therefore, the rear interior of the seat frame 10 has ample space for the second leg 30 to connect.

[0066] In some embodiments, the first leg 20 has a hole A formed below the seat frame 10. The folding chair 100 also includes a reinforcing rod 80, which is disposed at the hole A and whose two ends are fixedly connected to the first leg 20. By providing the reinforcing rod 80, the structural strength of the first leg 20 can be improved, thereby improving the overall structural strength of the folding chair 100. Specifically, the reinforcing rod 80 is a crossbar, and its two ends are connected to the first leg portion 21 and the second leg portion 22 of the first leg 20, respectively.

[0067] Please refer to Figure 5 and Figure 6 In some embodiments, the rear side of the seat frame 10 is also provided with a protruding limiting part 11. When the folding chair 100 is in the open state, the limiting part 11 can abut against one end of the backrest frame 40 to restrict the backrest frame 40 from rotating relative to the seat frame 10, and the first connecting part 31 forms a triangular structure A with the seat frame 10 and the backrest frame 40. The end of the backrest frame 40 that abuts against the limiting part 11 is the end of the backrest frame 40 that is rotatably connected to the first connecting part 31 of the second support leg 30.

[0068] When the folding chair 100 is in the open state and one end of the backrest frame 40 abuts against the limiting part 11 of the seat frame 10, the backrest frame 40 cannot rotate relative to the seat frame 10, thus fixing the positions of the backrest frame 40 and the seat frame 10. The second leg 30 is simultaneously rotatably connected to both the backrest frame 40 and the seat frame 10, therefore, the position of the second leg 30 is also fixed. Thus, by providing the protruding limiting part 11 to abut against the backrest frame 40, the position of the folding chair 100 in the open state can be determined, and the abutment method between the protruding limiting part 11 and the backrest frame 40 is simple, simplifying the overall structure of the folding chair 100. Furthermore, since the first connecting part 31 forms a triangular structure A with the seat frame 10 and the backrest frame 40, and the triangular structure A is stable, the position of the folding chair 100 in the open state is more reliable, and the load-bearing capacity of the folding chair 100 is improved.

[0069] In other embodiments, the rotation of the backrest frame 40 relative to the seat frame 10 can also be limited by providing a recessed limiting part on the seat frame 10 or by adding a limiting member; no specific limitation is imposed.

[0070] Furthermore, the folding chair 100 also includes a connecting rod 90. One end of the connecting rod 90 is connected to the connection between the first leg 20 and the seat frame 10, and is rotatably connected to both the first leg 20 and the seat frame 10. The other end of the connecting rod 90 is rotatably connected to the backrest frame 40. Specifically, the other end of the connecting rod 90 is connected between the armrest 95 and the second leg 30. When the folding chair 100 is in the open state, the connecting rod 90 forms a triangular structure B with the seat frame 10 and the backrest frame 40.

[0071] By setting a connecting rod 90, and forming a triangular structure B between the connecting rod 90, the seat frame 10, and the backrest frame 40 when the folding chair 100 is in the open state, the positional constraints between the first leg 20, the armrest 95, the backrest frame 40, and the seat frame 10 can be strengthened. Moreover, the triangular structure B is stable, thus making the position of the folding chair 100 more reliable in the open state and improving the load-bearing capacity of the folding chair 100.

[0072] Please refer to it again. Figure 1 In some embodiments, the first leg 20 also has a second connecting portion 23 protruding upward toward the seat frame 10, and the folding chair 100 also includes an armrest 95, the two ends of which are rotatably connected to the backrest frame 40 and the second connecting portion 23, respectively. The armrest 95 can support the user's arms.

[0073] By providing a protruding second connecting part 23 and rotatably connecting both ends of the armrest 95 to the backrest frame 40 and the second connecting part 23 respectively, the first leg 20, armrest 95, backrest frame 40, and seat frame 10 can form a parallelogram-like structure. Therefore, when the folding chair 100 is in the open state, the first leg 20, armrest 95, backrest frame 40, and seat frame 10 can restrain each other, improving the reliability of the folding chair 100 in the open state. When the folding chair 100 is in the folded state, the first leg 20 and backrest frame 40 can rotate relative to the seat frame 10 and fold onto opposite sides of the seat frame 10 through their rotatable connection with the armrest 95.

[0074] Specifically, the armrest 95 in this embodiment includes two armrests, which are respectively connected to the backrest frame 40 and the first support leg 20 on both sides to support the user's two arms.

[0075] In some embodiments, when the folding chair 100 is in the open position, the angle between the backrest frame 40 and the second leg 30 is greater than 90 degrees and less than 180 degrees. This allows the second leg 30 to provide better support for the seat frame 10, reducing the risk of tipping over.

[0076] In some embodiments, when the folding chair 100 is in the open position, the first leg 20 bends and extends away from the seat frame 10 and toward the second leg 30. This makes the support of the first leg 20 on the seat frame 10 more stable. In other embodiments, when the folding chair 100 is in the open position, the second leg 30 bends and extends away from the seat frame 10 and toward the first leg 20. This makes the support of the second leg 30 on the seat frame 10 more stable. In still other embodiments, when the folding chair 100 is in the open position, the first leg 20 bends and extends away from the seat frame 10 and toward the second leg 30, and the second leg 30 bends and extends away from the seat frame 10 and toward the first leg 20.

[0077] In some embodiments, the first leg 20 and the second leg 30 are provided with anti-slip pads 98 at the ends away from the seat frame 10. The anti-slip pads 98 can prevent the folding chair 100 from shifting position during use.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A folding chair, characterized in that, The folding chair comprises: a seat frame; a first leg; a first connecting portion protruding upwardly from the seat frame; a second leg rotatably connected to a rear side of the seat frame and having a first connecting portion protruding upwardly from the seat frame; and a backrest frame rotatably connected to the first connecting portion at one end. The folding chair comprises an open state and a folded state. When the folding chair is in the open state, the first leg and the second leg support the seat frame, and the backrest frame is arranged at an angle with the seat frame. When the folding chair is switched from the open state to the folded state, the second leg and the backrest frame are folded towards each other and towards the seat frame, and the first leg and the second leg are folded towards each other and towards the seat frame. The first leg is formed with a hole below the seat frame. When the folding chair is switched from the open state to the folded state, one end of the second leg away from the first connecting portion extends from the hole.

2. The folding chair of claim 1, wherein, The rear side of the seat frame is further provided with a protruding limiting portion. When the folding chair is in the open state, the limiting portion can abut against one end of the backrest frame to limit the rotation of the backrest frame relative to the seat frame, and the first connecting portion forms a triangular structure with the seat frame and the backrest frame.

3. The folding chair of claim 1 or 2, wherein, The folding chair further comprises a connecting rod. One end of the connecting rod is connected to the connection between the first leg and the seat frame, and is rotatably connected to the first leg and the seat frame. The other end of the connecting rod is rotatably connected to the backrest frame.

4. The folding chair of claim 3, wherein, When the folding chair is in the open state, the connecting rod forms a triangular structure with the seat frame and the backrest frame. The first leg further has a second connecting portion protruding upwardly from the seat frame. The folding chair further comprises an armrest. Both ends of the armrest are rotatably connected to the backrest frame and the second connecting portion, respectively.

5. The folding chair of claim 3, wherein, When the folding chair is in the open state, the angle between the backrest frame and the second leg is greater than 90 degrees and less than 180 degrees.

6. The folding chair of claim 1 or 2, wherein, When the folding chair is in the open state, the first leg is bent and extends away from the second leg, and / or the second leg is bent and extends towards the first leg.

7. The folding chair of claim 1 or 2, wherein, The seat frame is U-shaped, and the open end of the seat frame is located at the front side of the seat frame; and / or 8. The folding chair of claim 1 or 2, wherein, The first leg is U-shaped, and the open end of the first leg is arranged towards the seat frame; and / or The second leg is U-shaped, and the open end of the second leg is arranged towards the seat frame; and / or The backrest frame is U-shaped, and the open end of the backrest frame is arranged towards the seat frame. The backrest frame comprises a backrest portion and a pillow portion. The pillow portion is connected to one end of the backrest portion away from the second leg.

9. The folding chair of claim 1 or 2, wherein, The first leg is formed with a hole below the seat frame. The folding chair further comprises a reinforcing rod arranged at the hole and fixedly connected to both ends of the first leg.

10. The folding chair of claim 1 or 2, wherein, ​

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