Folding chair

Abstract

A folding chair, comprising a seat plate (10), and two X-shaped supports symmetrically arranged on the left and right sides of the seat plate (10). Each X-shaped support comprises a front leg (20) and a rear leg (30), which are rotatably hinged together, the front leg (20) and the rear leg (30) both being located on an outer side of the seat plate (10), the rear leg (30) being located between a side edge of the seat plate (10) and the front leg (20), and an upper end of the rear leg (30) being rotatably hinged to a front position of an outer side edge of the seat plate (10). A sliding connector (40) is further comprised, and the sliding connector (40) comprises a sliding portion (42) slidably connected to the side edge of the seat plate (10), a fixed portion (44) connected to the front leg (20), and a positioning plate (46) connected between the sliding portion (42) and the fixed portion (44), the positioning plate (46) being located on a rear side of the front leg (20). After the folding chair is folded, the rear legs (30) can be against the positioning plates (46) and flush with the front legs (20) from side to side, and the seat plate (10) will not interfere with the front legs (20) and the rear legs (30), such that the seat plate (10), the front legs (20) and the rear legs (30) can all fold into a state of vertical placement to allow the folding chair to be placed flat after being folded.

Description

folding chair Technical Field

[0001] The invention relates to a folding chair, in particular to an X-shaped folding chair which can be folded flat. Background Art

[0002] Folding chairs can be divided into herringbone folding chairs and X-shaped folding chairs according to the connection method of the front and rear supporting legs. The front and rear supporting legs of the herringbone folding chair are connected to the outside of the seat plate in a herringbone shape, while the front and rear supporting legs of the X-shaped folding chair are connected in an X-shaped shape and are located on the inner and outer sides of the seat plate respectively.

[0003] When the herringbone folding chair is in the folded state, the front and rear supporting legs are stacked together and the front and rear supporting legs cannot be folded into one plane. The side edges of the seat panel are hinged to the front and rear supporting legs respectively. Therefore, after the seat panel is folded, there is an angle between it and the front and rear supporting legs. In other words, after folding, the front supporting legs, rear supporting legs, and seat panel are respectively in different planes. As a result, the folding chair is uneven in the folded state and is very thick.

[0004] When folded, the seat of a traditional X-shaped folding chair rests on either the front or rear legs. Consequently, the front and rear legs, along with the seat, are all on different planes, resulting in the same technical issues of thickness and unevenness. Some improved X-shaped folding chairs incorporate recessed grooves in the seat to allow for a wider folding angle. While this reduces the thickness of the folded chair to some extent, the seat still overlaps the front and rear legs and their connection points. After folding, the seat still maintains a certain angle with the front and rear legs, preventing a completely flat fold. Furthermore, the recessed grooves weaken the seat to some extent.

[0005] Summary of the Invention

[0006] The present invention provides a folding chair that can be placed flat after folding, which overcomes the shortcomings of the background art. The technical solution adopted by the present invention to solve the technical problem is:

[0007] A folding chair comprises a seat and two X-shaped brackets symmetrically arranged on the left and right sides of the seat plate, the X-shaped brackets comprising front legs and rear legs rotatably hinged together, the front legs and rear legs are both located on the outside of the seat plate, and the rear legs are between the side edges of the seat plate and the front legs, the upper ends of the rear legs are rotatably hinged to the front position of the outer edges of the seat plate, and further comprises a sliding connection, the sliding connection comprising a sliding portion slidably connected to the side edges of the seat plate, a fixed portion connected to the front legs, and a positioning plate connected between the sliding portion and the fixed portion, the positioning plate being located on the rear side of the front legs, so that the rear legs can lean against the positioning plate and be flush with the left and right front legs after the folding chair is folded.

[0008] The front legs and the rear legs are both arranged on the outside of the seat plate, and the front legs and the seat plate are connected by a sliding connection. At the same time, the positioning plate is arranged on the rear side of the front legs. In this way, after the folding chair is folded, the rear legs can lean on the positioning plate and be flush with the front legs on the left and right, and the seat plate will not interfere with the front legs and the rear legs. Therefore, the seat plate, front legs and rear legs can all be folded to a vertical placement state. The folding chair has the advantage of being placed flat after being folded, and the strength of the seat plate will not be damaged.

[0009] In a preferred embodiment, the seat panel comprises a blister board and a frame. The blister board has a vertical, downward-facing flange around its perimeter. The frame is located inside the flange, and a pressing edge is provided at the bottom of the frame. The pressing edge extends from the bottom side to the outside of the flange and presses and secures the lower edge of the flange. The blister board seat panel is very thin, saving material and making the product lightweight. Existing structures that use recessed grooves cannot accommodate blister board. The improved structure of the present invention allows blister-type folding chairs to fold smoothly, achieving a breakthrough.

[0010] In a preferred embodiment, the sliding portion includes a connecting plate and a sliding pin. The connecting plate is connected to the positioning plate, and the sliding pin is connected to the connecting plate. A long sliding groove is provided on the side of the base plate corresponding to the sliding pin, and the sliding pin extends into the interior of the frame. The use of the sliding pin and the long sliding groove to achieve a sliding connection between the sliding portion and the base plate provides a simple structure and facilitates assembly.

[0011] In a preferred embodiment, a stop pin is provided on the side of the seat plate at the rear side of the long slide groove, and the stop pin blocks the sliding pin after the folding chair is opened.

[0012] In a preferred embodiment, the sliding portion includes a connecting plate and a sliding sleeve. The connecting plate is connected to the positioning plate. The sliding sleeve is connected to the connecting plate via a connecting pin. The sliding sleeve is rotatable relative to the connecting plate. The sliding sleeve encloses the side of the seat panel from below and is slidably connected to the side of the seat panel. The side of the seat panel is provided with a stop structure corresponding to the sliding portion. The stop structure blocks the sliding portion when the folding chair is unfolded. The sliding sleeve is rotatable, thereby ensuring that the sliding sleeve rotates with the seat panel when the seat panel is folded.

[0013] In a preferred embodiment, the inner surface of the sliding sleeve is provided with an inner lining member, which is provided with a pressure strip. The inner side edge of the frame is provided with a pressure shoulder. The pressure strip is located above the pressure shoulder to vertically restrain the sliding sleeve. Because the sliding sleeve wraps around the side of the seat plate from below, and the pressure strip grips the pressure shoulder from above, the connection between the sliding sleeve and the side of the seat plate is very stable.

[0014] In a preferred embodiment, the fixing portion is a flat plate structure, the fixing portion is connected to the inner side of the front leg, the fixing portion, the positioning plate and the connecting plate form a U-shaped groove, and the rear leg is accommodated in the U-shaped groove after the folding chair is folded.

[0015] In a preferred embodiment, the sliding portion is provided with a sliding shaft, and a track groove is provided on the inner or outer side of the seat panel. The sliding shaft is slidably assembled in the track groove. The sliding portion has a C-shaped structure, hooked from below onto the side of the seat panel. A stop pin is provided at the rear of the seat panel to block the sliding portion when the folding chair is opened. The sliding portion hooks onto the side of the seat panel and then slides by the sliding shaft and track groove, resulting in a novel structure.

[0016] In a preferred embodiment, a bayonet is provided on the rear side of the lower side of the seat panel, and the sliding portion engages with the bayonet when the folding chair is opened. The bayonet can engage with the sliding portion, making the seat panel more stable after it is fully opened.

[0017] In a preferred embodiment, the sliding portion includes a bottom frame and guide protrusions. The guide protrusions are connected to the upper portion of the side of the positioning plate, and the bottom frame is connected to the lower portion of the side of the positioning plate. The top of the bottom frame is provided with a notch. The side of the seat plate is supported by the bottom frame. The notch pinches the side of the seat plate from below. The side of the seat plate is provided with track grooves corresponding to the guide protrusions, and the guide protrusions are slidably adapted in the track grooves. The guide protrusions and the bottom frame cooperate to clamp the side of the seat plate in the vertical direction, resulting in a novel structure. The structure of the seat plate side is simpler, making it easier to produce.

[0018] In a preferred embodiment, a stop block is provided on the side of the seat plate at the rear side of the track groove, and a stop pin is provided on the side of the seat plate at the rear position. After the folding chair is opened, the stop block blocks the guide protrusion, and the stop pin blocks the bottom frame.

[0019] In a preferred embodiment, the fixing portion is inserted into the front leg from the rear side of the front leg.

[0020] In a preferred embodiment: a concave step is formed between the upper surface of the blister plate and the flange; or the upper surface of the blister plate and the flange are transitionally connected by a concave step and a laterally protruding flange in sequence; or a concave step is formed between the upper surface of the blister plate and the flange, and the flanges on both sides are provided with outwardly protruding flanges at the top; or a concave step is formed between the left and right sides of the upper surface of the blister plate and the flange, and the flanges on both sides are provided with outwardly protruding flanges at the top. The steps and flanges not only increase the strength of the blister plate, but also widen the support area of ​​the seat plate, and enhance the product's sense of heaviness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] FIG1 is a perspective view of a first embodiment of a folding chair according to the present invention.

[0023] FIG. 2 is another perspective view of the folding chair shown in FIG. 1 .

[0024] FIG. 3 is a partial exploded schematic diagram of the folding chair shown in FIG. 1 .

[0025] FIG4 is a schematic cross-sectional view of the folding chair shown in FIG1 at the position of the sliding connection member.

[0026] FIG. 5 is a schematic diagram illustrating the folding process of the folding chair shown in FIG. 1 .

[0027] FIG6 is a schematic cross-sectional view of the folding chair shown in FIG1 after being folded.

[0028] FIG. 7 is a partial cross-sectional view of the seat of the folding chair shown in FIG. 1 .

[0029] FIG. 8 is a schematic diagram illustrating the structural deformation of the seat plate of the folding chair shown in FIG. 1 .

[0030] FIG. 9 is a schematic diagram illustrating another structural deformation of the seat plate of the folding chair shown in FIG. 1 .

[0031] FIG. 10 is a partial schematic diagram of the second embodiment of the folding chair of the present invention (position of the sliding connection member).

[0032] FIG. 11 is a cross-sectional view of the folding chair shown in FIG. 10 at the position of the sliding connection member.

[0033] FIG12 is a schematic cross-sectional view of the folding chair shown in FIG10 after being folded.

[0034] FIG. 13 is a perspective view of a third embodiment of a folding chair according to the present invention.

[0035] FIG. 14 shows another perspective view of the folding chair shown in FIG. 13 .

[0036] FIG15 is a schematic cross-sectional view of the folding chair shown in FIG13 after being folded.

[0037] FIG. 16 is a schematic diagram illustrating the structural deformation of the seat plate of the folding chair shown in FIG. 13 .

[0038] FIG. 17 is a partial schematic diagram of a fourth embodiment of the folding chair of the present invention (position of the sliding connection member).

[0039] FIG. 18 is a partial cross-sectional view of the folding chair shown in FIG. 17 (position of the sliding connector).

[0040] FIG. 19 is a perspective view of the sliding connector of the folding chair shown in FIG. 17 .

[0041] FIG. 20 illustrates another partial schematic view of the folding chair shown in FIG. 17 (position of the sliding connection member).

[0042] FIG. 21 shows another partial schematic diagram of the folding chair shown in FIG. 17 (position of the sliding connection member).

[0043] FIG22 is a schematic cross-sectional view of the folding chair shown in FIG17 after being folded. DETAILED DESCRIPTION

[0044] In the description, the use of terms such as "front," "back," "left," "right," and "direction" to indicate positions or locations is based on the positions or locations shown in the accompanying drawings and is intended solely to facilitate the description of the present invention. They are not intended to indicate or imply that the device referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0045] Example 1

[0046] Referring to Figures 1 to 6, an X-shaped folding chair includes a seat 10 and two X-shaped brackets symmetrically arranged on the left and right sides of the seat, the two X-shaped brackets supporting the seat. The X-shaped brackets include front legs 20 and rear legs 30 that are pivotally hinged. The front legs 20 and rear legs 30 are both located on the outside of the seat 10, and the rear legs 30 are located between the side edges of the seat 10 and the front legs 20. In other words, in the outward extension direction of the seat, the rear legs are located outward from the side edges of the seat, and the front legs are located outward from the rear legs. The upper ends of the rear legs 30 are pivotally hinged to the front of the outer edge of the seat 10. The X-shaped brackets also include sliding connectors 40 symmetrically arranged on the outer side of the seat, connecting between the front legs 20 and the seat 10. The sliding connectors 40 include sliding portions 42 that are slidably connected to the side edges of the seat 10, fixed portions 44 connected to the front legs 20, and positioning plates 46 connected between the sliding portions and the fixed portions. The positioning plate 46 is located behind the front legs 20, so that the rear legs 30 can rest on the positioning plate 46 and be flush with the front legs when the folding chair is folded. In other words, because the front legs are outside the rear legs, which are also outside the seat, the front legs, rear legs, and seat do not interfere with each other when folded. In other words, all three can be folded horizontally or vertically, and all three are roughly in the same plane when folded. Moreover, the front and rear legs overlap at the connection point with the seat, and the front and rear legs also overlap in height when folded.

[0047] Preferably, as shown in FIG6 , the seat plate 10 includes a blister plate 11 and a frame 12. The blister plate 11 has a vertically downwardly facing flange 112 around its perimeter. The frame 12 is located inside the flange. A pressing edge 121 is provided at the bottom of the frame. The pressing edge 121 extends from the bottom side to the outside of the flange 112 and presses and secures the lower edge of the flange. Therefore, the frame is connected to the blister plate on all sides, increasing the strength of the seat plate. Furthermore, the frame provides support for the sliding portion 42, ensuring that the blister plate can be made of thin blister sheet material.

[0048] Preferably, the sliding portion 42 includes a connecting plate 421 and a sliding pin 422. The connecting plate 421 is connected to the positioning plate 46, and the sliding pin 422 is connected to the connecting plate 421. The side of the seat plate 10 is provided with a long sliding groove 13 corresponding to the sliding pin 422, and the sliding pin 422 extends into the interior of the frame 12. Specifically, in this embodiment, a cavity is formed inside the frame 12, and notches are provided on the flange 112 and the frame 12 to form the long sliding groove 13. The sliding pin 422 extends into the interior of the frame 12 via the notch, so that the frame 12 can provide support for the sliding pin 422.

[0049] Preferably, a stop pin 14 is provided on the side of the seat plate 10 at the rear side of the long chute 13. When the folding chair is opened, the stop pin 14 blocks the sliding pin 422, thereby fully opening the folding chair. It is understood that fully opening can also be achieved by moving the sliding pin 422 to the end of the long chute, and the stop pin may also be omitted.

[0050] Preferably, the fixing portion 44 is a flat plate structure, the fixing portion 44 is connected to the inner side of the front leg, the fixing portion 44, the positioning plate 46 and the connecting plate 421 form a U-shaped groove 48, and the rear leg 30 is accommodated in the U-shaped groove 48 after the folding chair is folded.

[0051] Preferably, referring to FIG7 , the upper surface of the blister plate 11 and the flange 112 are transitionally connected by a concave step 114 and a laterally outwardly protruding flange 116. Of course, as shown in FIG8 , the step and flange may be omitted, with the flange formed directly on the outer edge of the upper surface of the blister plate. Alternatively, as shown in FIG9 , a concave step 114 may be formed between the upper surface of the blister plate 11 and the flange 112.

[0052] 5 , when the folding chair of the present invention is folded, the seat plate 10 moves backward (toward the right side in the figure) and gradually flips downward, and the sliding pin 422 gradually moves toward the front end of the long slide groove 13. Finally, after folding, the seat plate, front legs and rear legs can be placed vertically. Therefore, as shown in FIG6 , in the folded state, the folding chair can be folded into a flat surface, and the overall thickness is optimized to a minimum.

[0053] Example 2

[0054] Referring to Figures 10 to 12 , the difference between Example 2 and Example 1 lies in the structure of the sliding portion 42. Specifically, in Example 2, the sliding portion 42 includes a connecting plate 421 and a sliding sleeve 423. The connecting plate 421 is connected to the positioning plate 46. The sliding sleeve 423 is connected to the connecting plate 421 via a connecting pin 424. The sliding sleeve 423 is rotatable relative to the connecting plate 421. The sliding sleeve 423 is inserted from below into the side of the seat plate 10 and slides in engagement with the side of the seat plate. Furthermore, the fixing portion 44, positioning plate 46, and connecting plate 421 also form a U-shaped groove 48, similar to that of Example 1.

[0055] Preferably, a stop structure is provided on the side of the seat plate 10 corresponding to the sliding portion, and the stop structure blocks the sliding portion 42 after the folding chair is opened.

[0056] Preferably, the inner surface of the sliding sleeve 423 is provided with an inner lining 425, the inner lining is provided with a pressure strip 426, the inner side edge of the frame 12 is provided with a pressure shoulder 122, and the pressure strip 426 is located above the pressure shoulder 122 to limit the sliding sleeve 423 in the vertical direction.

[0057] Example 3

[0058] Referring to Figures 13 to 15 , the third embodiment differs from the first embodiment in the structure of the sliding portion 42. Specifically, in the third embodiment, the sliding portion 42 is C-shaped, hooking onto the side of the seat plate 10 from below. A sliding shaft 427 is provided on the sliding portion 42. The side of the seat plate 10 is provided with a track groove 15 on the inside (the track groove is directly formed in the frame 12), and the sliding shaft 427 is slidably assembled in the track groove 15. As shown in Figure 16 , the track groove 15 can also be provided on the outside of the side of the seat plate 10.

[0059] Preferably, a stop pin is provided at the rear of the side of the seat plate 10 , and the stop pin blocks the sliding portion after the folding chair is opened.

[0060] Preferably, a bayonet 16 is provided at the rear side of the lower side of the seat plate 10 , and the sliding portion 42 is engaged with the bayonet 16 after the folding chair is opened.

[0061] Preferably, the fixing portion 44 is inserted into the front leg 20 from the rear side of the front leg.

[0062] Preferably, a concave step 114 is formed between the left and right sides of the upper surface of the blister board 11 and the flange 112 , and the left and right flanges 112 are provided with outwardly protruding flanges 116 at the top.

[0063] Example 4

[0064] Referring to Figures 17 to 22 , the fourth embodiment differs from the third embodiment in that the structure of the sliding portion 42 is different. Specifically, in the fourth embodiment, the sliding portion 42 includes a bottom frame 428 and a guide protrusion 429. The guide protrusion 429 is connected to the upper portion of the side of the positioning plate 46, and the bottom frame 428 is connected to the lower portion of the side of the positioning plate 46. The top of the bottom frame 428 is provided with a notch 4281. The side of the seat plate 10 is supported by the bottom frame 428. The notch 4281 pinches the side of the seat plate 10 from below. The side of the seat plate is provided with a track groove 17 corresponding to the guide protrusion 429, and the guide protrusion 429 is slidably adapted to fit within the track groove 17. It is understood that the guide protrusion 429 and the bottom frame 428 respectively restrain the side of the seat plate from the upper and lower directions.

[0065] Preferably, a stopper 18 is provided on the side of the seat panel 10 at the rear side of the track groove 17, and a stopper pin 19 is provided on the side of the seat panel at the rear position. When the folding chair is opened, the stopper 18 blocks the guide protrusion 429, and the stopper pin 19 blocks the bottom frame 428. Of course, the guide protrusion 429 can also achieve positioning in the opened state when it abuts against the rear end wall of the track groove 17, so the stopper 18 and the stopper pin 19 may not be required.

[0066] The above description is merely a preferred embodiment of the present invention and therefore cannot be used to limit the scope of the present invention. In other words, equivalent changes and modifications made according to the scope of the present invention and the contents of the specification should still fall within the scope of the present invention. Industrial Applicability

[0067] The present invention discloses a folding chair, comprising a seat and two X-shaped brackets symmetrically arranged on the left and right sides of the seat, the X-shaped brackets comprising front legs and rear legs that are rotatably hinged together, the front legs and rear legs both being located on the outside of the seat, and the rear legs being interposed between the side edges of the seat and the front legs, the upper ends of the rear legs being rotatably hinged to the front portion of the outside edges of the seat, and further comprising sliding connectors comprising a sliding portion slidably connected to the side edges of the seat, a fixed portion connected to the front legs, and a positioning plate connected between the sliding portion and the fixed portion, the positioning plate being located on the rear sides of the front legs. After the folding chair is folded, the rear legs can rest on the positioning plates to be flush with the front legs on the left and right sides, and the seat will not interfere with the front legs and rear legs, so that the seat, front legs, and rear legs can all be folded to a vertical position. The folding chair has the advantage of being placed flat after folding, and has industrial applicability.

Claims

1. A folding chair comprising a seat and two X-shaped brackets symmetrically arranged on the left and right sides of the seat, wherein the X-shaped brackets include front and rear legs that are rotatably hinged, and characterized in that: The front legs and rear legs are located on the outside of the seat plate, and the rear legs are between the side edges of the seat plate and the front legs in the lateral extension direction of the seat plate, and the upper ends of the rear legs are rotatably hinged to the front positions of the outer edges of the seat plate; the front legs also include sliding connectors symmetrically arranged on both sides of the seat plate, and the sliding connectors include a sliding portion slidably connected to the side edges of the seat plate, a fixed portion connected to the front legs, and a positioning plate connected between the sliding portion and the fixed portion, the positioning plate being located on the rear side of the front legs, and the rear legs can lean against the positioning plate and be flush with the front legs on the left and right after the folding chair is folded.

2. The folding chair according to claim 1, characterized in that: The seat plate includes a blister plate and a frame. The blister plate has vertical downward flanges on all sides. The frame is located on the inner side of the flange. A pressing edge is provided at the bottom of the frame. The pressing edge goes around from the bottom side to the outside of the flange and presses and fixes the lower edge of the flange.

3. The folding chair according to claim 2, characterized in that: The sliding part includes a connecting plate and a sliding pin, the connecting plate is connected to the positioning plate, the sliding pin is connected to the connecting plate, a long sliding groove is provided on the side of the seat plate corresponding to the sliding pin, and the sliding pin extends into the interior of the frame.

4. The folding chair according to claim 3, characterized in that: A stop pin is provided on the side of the seat plate at the rear side of the long slide groove, and the stop pin blocks the sliding pin after the folding chair is opened.

5. The folding chair according to claim 2, characterized in that: The sliding part includes a connecting plate and a sliding sleeve. The connecting plate is connected to the positioning plate. The sliding sleeve and the connecting plate are connected by a connecting pin. The sliding sleeve can rotate relative to the connecting plate. The sliding sleeve covers the side of the seat plate from below. The sliding sleeve is slidably connected to the side of the seat plate. A stop structure is provided on the side of the seat plate corresponding to the sliding part. After the folding chair is opened, the stop structure blocks the sliding part.

6. The folding chair according to claim 5, characterized in that: The inner surface of the sliding sleeve is provided with an inner lining, the inner lining is provided with a pressure strip, the inner side edge of the frame is provided with a pressure shoulder, and the pressure strip is located above the pressure shoulder to limit the sliding sleeve in the vertical direction.

7. The folding chair according to claim 3 or 5, characterized in that: The fixing portion is a flat plate structure, connected to the inner side of the front leg, the fixing portion, the positioning plate and the connecting plate form a U-shaped groove, and the rear leg is accommodated in the U-shaped groove after the folding chair is folded.

8. The folding chair according to claim 2, characterized in that: The sliding part is provided with a sliding shaft, and the side of the seat plate is provided with a track groove on the inner side or the outer side. The sliding shaft can be slidably assembled in the track groove. The sliding part has a C-shaped structure, and the sliding part is hooked on the side of the seat plate from the bottom; the side of the seat plate is provided with a stop pin at the rear position, and the stop pin blocks the sliding part after the folding chair is opened.

9. The folding chair according to claim 8, characterized in that: A bayonet is provided at the rear side of the lower side of the seat plate, and the sliding portion is engaged with the bayonet after the folding chair is opened.

10. The folding chair according to claim 2, characterized in that: The sliding part includes a bottom frame and a guide protrusion, the guide protrusion is connected to the upper part of the side of the positioning plate, the bottom frame is connected to the lower part of the side of the positioning plate, the top of the bottom frame is provided with a notch, the side of the seat plate is supported by the bottom frame, the notch pinches the side of the seat plate from below, the side of the seat plate is provided with a track groove corresponding to the guide protrusion, and the guide protrusion can be slidably adapted in the track groove.

11. The folding chair according to claim 10, characterized in that: The side of the seat plate is provided with a stop block at the rear side of the track groove, and the side of the seat plate is provided with a stop pin at the rear position. After the folding chair is opened, the stop block blocks the guide protrusion, and the stop pin blocks the bottom frame.

12. The folding chair according to claim 8 or 10, characterized in that: The fixing portion is inserted into the front leg from the rear side of the front leg.

13. The folding chair according to claim 2, characterized in that: A concave step is formed between the upper surface of the blister plate and the flange; or, the upper surface of the blister plate and the flange are transitionally connected by a concave step and a flange protruding laterally outward in sequence; or, a concave step is formed between the upper surface of the blister plate and the flange, and the flanges on both sides are provided with flanges protruding outward at the top; or, a concave step is formed between the left and right sides of the upper surface of the blister plate and the flange, and the flanges on both sides are provided with flanges protruding outward at the top.

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