FOLDABLE CHAIR

Abstract

A foldable chair includes a seat plate, two X-shaped supporting frames symmetrically, and two sliding connecting members, each of the two X-shaped supporting frames includes a front leg and a rear leg pivotally connected together, the front leg and the rear leg are located outside of the seat plate, the rear leg is disposed between a side edge of the seat plate and the front leg, an upper end of the rear leg is pivotally connected to a front position of the side edge of the seat plate, each of the two sliding connecting members includes a sliding part, a fixed part, and a positioning plate, and the positioning plate is located on a rear side of the front leg, so that the rear leg is configured to abut the positioning plate and align with the front leg in a left-and-right direction after the foldable chair is folded.

Description

FIELD OF THE DISCLOSURE

The present disclosure relates to a foldable chair, and in particular relates to an X-shaped foldable chair configured to be flatly folded.

BACKGROUND OF THE DISCLOSURE

Foldable chairs can be divided into A-shaped foldable chairs and X-shaped foldable chairs according to a connecting method of front and rear supporting legs. The front and rear supporting legs of the A foldable chairs are rotatably connected to outer sides of a seat plate of the A foldable chairs in a A shape. The front and rear supporting legs of the X-shaped foldable chairs define an X-shaped rotatable connection and are respectively located on inner and outer sides relative to the seat plate.

When the A-shaped foldable chairs are folded, the front and rear supporting legs are overlapped, and the front and rear supporting legs cannot be located in a same plane. Side edges of the seat plate are respectively pivotally connected to the front and rear supporting legs, so that, after being folded, the seat plate defines intersecting angles with both of the front and rear supporting legs. That is, after being folded, the front supporting legs, the rear supporting legs, and the seat plate are respectively located on different planes, causing the A-foldable chairs to have a large thickness and to be out of flatness in a folded state.

When the traditional X-shaped foldable chairs are in the folded state, the seat plate is overlapped on the front supporting legs or the rear supporting legs, so that the front supporting legs, the rear supporting legs, and the seat plate are respectively located in different planes after being folded, also resulting in technical problems of large thickness and out of flatness. Some improved X-shaped foldable chairs have an avoidance groove on the seat plate, so that a folding angle of the seat plate can be larger. Although a thickness of the X-shaped foldable chairs can be reduced by a certain extent after the X-shaped foldable chairs are folded, the seat plate is still overlapped on the front and rear supporting legs and connection points of the front and rear support legs. After the seat plate is folded, there are still somewhat intersecting angles between the seat plate and the front and rear supporting legs so as to be not completely, flatly folded, and the avoidance groove on the seat plate weakens a strength of the seat plate to a certain extent.

BRIEF SUMMARY OF THE DISCLOSURE

The present disclosure provides a foldable chair that can be flatly placed after being folded to overcome the deficiencies of the background technology. The technical solution of the present disclosure to solve the technical problems is described as follows.

A foldable chair, the foldable chair comprises a seat plate, two X-shaped supporting frames symmetrically arranged on left and right sides of the seat plate, and two sliding connecting members, each of the two X-shaped supporting frames comprises a front leg and a rear leg pivotally connected to the front leg, the front leg and the rear leg are both located outside of the seat plate, the rear leg is disposed between a side edge of the seat plate and the front leg, an upper end of the rear leg is pivotally connected to a front position of the side edge of the seat plate, each of the two sliding connecting members comprises a sliding part slidably connected to the side edge of the seat plate, a fixed part connected to the front leg, and a positioning plate connected to and disposed between the sliding part and the fixed part, and the positioning plate is located on a rear side of the front leg, so that the rear leg is configured to abut the positioning plate and align with the front leg in a left-and-right direction after the foldable chair is folded.

The front leg and the rear leg are both located outside of the seat plate, and the front leg is connected to the seat plate through the sliding connecting member. At the same time, the positioning plate is located on the rear side of the front leg, so that after the foldable chair is folded, the rear leg can abut the positioning plate and align with the front leg in the left-and-right direction, and the seat plate will not interfere with the front leg and the rear leg. Therefore, the seat plate, the front leg, and the rear leg can be folded to be placed in an upright state, and the foldable chair is folded to have the advantages of being flatly placed without damaging a strength of the seat plate.

In a preferred embodiment, the seat plate comprises a vacuum-formed plastic plate and a frame, four sides of the vacuum-formed plastic plate have a folded edge extending vertically downward, the frame is located on an inner side of the folded edge, a bottom of the frame comprises a pressing edge, and the pressing edge goes around to an outer side of the folded edge from a lower side of the folded edge to tightly press and secure a lower edge of the folded edge. The seat plate adopts the vacuum-formed plastic plate with a very small thickness, enabling material savings, and making the product light. The existing structure with an avoidance groove cannot adopt a structure of the vacuum-formed plastic plate. The improved structure of the present disclosure allows a foldable chair with the vacuum-formed plastic plate to be flatly folded to achieve zero breakthrough.

In a preferred embodiment, the sliding part comprises 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, the side edge of the seat plate comprises an elongated sliding groove corresponding to the sliding pin, and the sliding pin extends into an inner side of the frame. The method with the sliding pin and the elongated sliding groove is used to realize a sliding connection between the sliding part and the seat plate, the structure is simple, and the assembly is convenient.

In a preferred embodiment, the side edge of the seat plate is disposed with a blocking pin located on a rear side of the elongated sliding groove, and when the foldable chair is unfolded, the blocking pin blocks the sliding pin.

In a preferred embodiment, the sliding part comprises 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 by a connecting pin, the sliding sleeve is configured to rotate relative to the connecting plate, the sliding sleeve is sleeved on the side edge of the seat plate from a lower side of the side edge of the seat plate, the sliding sleeve is connected to the side edge of the seat plate using a sliding fit, the side edge of the seat plate is disposed with a stopping structure corresponding to the sliding part, and the stopping structure blocks the sliding part when the foldable chair is unfolded. The sliding sleeve is rotatable, thereby ensuring that the sliding sleeve can rotate at an angle along with the seat plate when the seat plate is folded.

In a preferred embodiment, an inner surface of the sliding sleeve is disposed with a lining member, the lining member comprises a pressing strip, an inner side edge of the frame comprises a pressing shoulder, and the pressing strip is located on an upper side of the pressing shoulder so as to inhibit movement of the sliding sleeve in a vertical direction. As the sliding sleeve covers the side edge of the seat plate from a lower side in addition to the pressing strip blocking the pressing shoulder from an upper side, a connection between the sliding sleeve and the side edge of the seat plate is very stable.

In a preferred embodiment, the fixed part is a flat plate structure, the fixed part is connected to an inner side edge of the front leg, the fixed part, the positioning plate, and the connecting plate form a U-shaped groove, and the rear leg is received in the U-shaped groove after the foldable chair is folded.

In a preferred embodiment, the sliding part comprises a sliding shaft, an inner side or an outer side of the side edge of the seat plate comprises a rail groove, the sliding shaft is slidably assembled in the rail groove, the sliding part defines a C-shaped structure, the sliding part is hooked on the side edge of the seat plate from a lower side of the side edge of the seat plate, a rear position of the side edge of the seat plate is disposed with a blocking pin, and the blocking pin blocks the sliding part after the foldable chair is unfolded. The sliding part is hooked on the side edge of the seat plate and then slides by cooperation of the sliding shaft and the rail groove, and the structure is novel.

In a preferred embodiment, a rear position of a lower side of the side edge of the seat plate comprises a buckling notch, and the sliding part is buckled to the buckling notch after the foldable chair is unfolded. The buckling opening can be buckled to the sliding part to enable the seat plate to be more stable after the seat plate is opened into place.

In a preferred embodiment, the sliding part comprises a bottom frame and a guiding protrusion, the guiding protrusion is connected to an upper part of a side edge of the positioning plate, the bottom frame is connected to a lower part of the side edge of the positioning plate, a top of the bottom frame comprises a notch, the side edge of the seat plate is supported by the bottom frame, the notch is buckled to the side edge of the seat plate from a lower side of the side edge of the seat plate, the side edge of the seat plate comprises a rail groove corresponding to the guiding protrusion, and the guiding protrusion slidably fits in the rail groove. The guiding protrusion cooperates with the bottom frame to clamp the side edge of the seat plate in an up-and-down direction. The structure is novel, and the structure of the side edge of the seat plate is simple and easily produced.

In a preferred embodiment, the side edge of the seat plate is disposed with a block located on a rear side of the rail groove, a rear position of the side edge of the seat plate is disposed with a blocking pin, and after the foldable chair is unfolded, the block blocks the guiding protrusion, and the blocking pin blocks the bottom frame.

In a preferred embodiment, the fixed part is inserted into the front leg from the rear side of the front leg.

In a preferred embodiment, a concave step is formed between an upper surface of the vacuum-formed plastic plate and the folded edge; the upper surface of the vacuum-formed plastic plate is connected to the folded edge through a transition of the concave step and a flange laterally protruding outward in sequence; the concave step is formed between the upper surface of the vacuum-formed plastic plate and the folded edge, and a top position of left and right sides of the folded edge comprises the flange protruding outward; or the concave step is formed between left and right sides of the upper surface of the vacuum-formed plastic plate and the folded edge, and the top position of the left and right sides of the folded edge comprises the flange protruding outward. The concave step and the protruding flange can not only increase the strength of the vacuum-formed plastic plate, but a supporting area of the seat plate is also broadened, and heaviness-like feeling of the product can be also enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

FIG. 1 illustrates a perspective view of a foldable chair in Embodiment 1 of the present disclosure.

FIG. 2 illustrates another perspective view of the foldable chair shown in FIG. 1.

FIG. 3 illustrates an exploded view of a portion of the foldable chair shown in FIG. 1.

FIG. 4 illustrates a sectional view of the foldable chair shown in FIG. 1 at a position of a sliding connecting member.

FIG. 5 illustrates a diagrammatic view of a folding process of the foldable chair shown in FIG. 1.

FIG. 6 illustrates a sectional view of the foldable chair shown in FIG. 1 after being folded.

FIG. 7 illustrates a sectional view of a portion of a seat plate of the foldable chair shown in FIG. 1.

FIG. 8 illustrates a diagrammatic view of a structural alternative of the seat plate of the foldable chair shown in FIG. 1.

FIG. 9 illustrates a diagrammatic view of another structural alternative of the seat plate of the foldable chair shown in FIG. 1.

FIG. 10 illustrates a diagrammatic view (e.g., at a position of a sliding connecting member) of a portion of a foldable chair in Embodiment 2 of the present disclosure.

FIG. 11 illustrates a sectional view of the foldable chair shown in FIG. 10 at the position of the sliding connecting member.

FIG. 12 illustrates a sectional view of the foldable chair shown in FIG. 10 after being folded.

FIG. 13 illustrates a perspective view of a foldable chair in Embodiment 3 of the present disclosure.

FIG. 14 illustrates another perspective view of the foldable chair shown in FIG. 13.

FIG. 15 illustrates a sectional view of the foldable chair shown in FIG. 13 after being folded.

FIG. 16 illustrates a diagrammatic view of a structural alternative of a seat plate of the foldable chair shown in FIG. 13.

FIG. 17 illustrates a diagrammatic view (e.g., at a position of a sliding connecting member) of a portion of a foldable chair in Embodiment 4 of the present disclosure.

FIG. 18 illustrates a sectional view of the portion of the foldable chair shown in FIG. 17 at the position of the sliding connecting member.

FIG. 19 illustrates a perspective view of the sliding connecting member of the foldable chair shown in FIG. 17.

FIG. 20 illustrates another diagrammatic view of the portion of the foldable chair shown in FIG. 17 at the position of the sliding connecting member.

FIG. 21 illustrates another diagrammatic view of the portion of the foldable chair shown in FIG. 17 at the position of the sliding connecting member.

FIG. 22 illustrates a sectional view of the foldable chair shown in FIG. 17 after being folded.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the description, “front”, “rear”, “left”, “right”, “direction”, etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the accompanying drawings and are only for easily describing the present disclosure, rather than indicating or implying that the referenced or implied device should have a specific orientation or be constructed and operated in a specific orientation, so that it should not be understood as a limitation of the present disclosure. The specific meaning of the aforementioned terms in the present disclosure can be understood according to specific conditions for person of ordinary skill in the art.

Embodiment 1

Referring to FIGS. 1-6, a foldable chair (i.e., X-shaped foldable chair) comprises a seat plate 10 and two X-shaped supporting frames symmetrically arranged on left and right sides of the seat plate 10. The two X-shaped supporting frames support the seat plate 10. The two X-shaped supporting frames each comprise a front leg 20 and a rear leg 30 pivotally connected to the front leg 20. The front leg 20 and the rear leg 30 are all located outside of the seat plate 10, and the rear leg 30 is disposed between a side edge of the seat plate 10 and the front leg 20. That is, in a direction extending outward from the seat plate 10, the rear leg 30 is disposed outside of the side edge of the seat plate 10, and the front leg 20 is then disposed outside of the rear leg 30. An upper end of the rear leg 30 is pivotally connected to a front position of the side edge of the seat plate 10, and sliding connecting members 40 symmetrically disposed outside of the seat plate 10 are further provided (i.e., the foldable chair comprises two sliding connecting members 40 symmetrically disposed on two sides of the seat plate 10). The sliding connecting members 40 are each connected to and disposed between the front leg 20 and the seat plate 10. The sliding connecting members 40 each comprises a sliding part 42 slidably connected to the side edge of the seat plate 10, a fixed part 44 connected to the front leg 20, and a positioning plate 46 connected to and disposed between the sliding part 42 and the fixed part 44. The positioning plate 46 is located on a rear side of the front leg 20, so that the rear leg 30 can abut the positioning plate 46 and align with the front leg 20 in a left-and-right direction after the foldable chair is folded. That is, as the front leg 20 is located outside of the rear leg 30 and the rear leg 30 is located outside of the seat plate 10, when being folded, the three parts (i.e., the front leg 20, the rear leg 30, and seat plate 10) will not interfere with each other, the three parts can be folded to be horizontally or vertically placed, the three parts are roughly on a same plane in a folded state, and connection positions of the front leg 20 and the rear leg 30 with the seat plate 10 overlap. Heights of the front leg 20 and the rear leg 30 also overlap in the folded state.

Preferably, as shown in FIG. 6, the seat plate 10 comprises a vacuum-formed plastic plate 11 and a frame 12. Four sides of the vacuum-formed plastic plate 11 have a folded edge 112 extending vertically downward, and the frame 12 is located on an inner side of the folded edge 112. As shown in FIGS. 7-9, a bottom of the frame 12 comprises a pressing edge 121, and the pressing edge 121 goes around to an outer side of the folded edge 112 from a lower side to tightly press and secure a lower edge of the folded edge 112. Therefore, the frame 12 is connected to the four sides of the vacuum-formed plastic plate 11, a strength of the seat plate 10 is increased, and the sliding part 42 is supported by the frame 12, ensuring that the vacuum-formed plastic plate 11 can use a vacuum-forming sheet with a small thickness.

Preferably, the sliding part 42 comprises 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 edge of the seat plate 10 comprises an elongated sliding groove 13 corresponding to the sliding pin 422, and the sliding pin 422 extends into an inner side of the frame 12. Specifically, in this embodiment, the inner side of the frame 12 forms a cavity, and the folded edge 112 and the frame 12 both comprise notches to form the elongated sliding groove 13. The sliding pin 422 extends into the inner side of the frame 12 though the notches, so that the frame 12 can provide a supporting force for the sliding pin 422.

Preferably, the side edge of the seat plate 10 is disposed with a blocking pin 14 located on a rear side of the elongated sliding groove 13. When the foldable chair is unfolded, the blocking pin 14 blocks the sliding pin 422, so that the foldable chair is unfolded in place. It can be understood that the foldable chair can be unfolded in place by moving the sliding pin 422 to a tail end of the elongated sliding groove 13 without the blocking pin 14.

Preferably, the fixed part 44 is a flat plate structure, and the fixed part 44 is connected to an inner side edge of the front leg 20. The fixed part 44, the positioning plate 46, and the connecting plate 421 form a U-shaped groove 48, and the rear leg 30 is received in the U-shaped groove 48 after the foldable chair is folded.

Preferably, referring to FIG. 7, an upper surface of the vacuum-formed plastic plate 11 and the folded edge 112 are connected through a transition of a concave step 114 and a flange 116 laterally protruding outward. Alternatively, as shown in FIG. 8, the folded edge 112 can be directly formed on an outer edge of the upper surface of the vacuum-formed plastic plate 11 without the concave step 114 and the protruding flange 116. Alternatively, as shown in FIG. 9, the concave step 114 is formed between the upper surface of the vacuum-formed plastic plate 11 and the folded edge 112.

Referring to FIG. 5, when the foldable chair of the present disclosure is folded, the seat plate 10 moves backward (e.g., toward a right side in FIG. 5) and gradually turns downward. The sliding pin 422 gradually moves toward a front end of the elongated sliding groove 13 to be finally folded. The seat plate 10, the front leg 20, and the rear leg 30 can be placed vertically. Therefore, as shown in FIG. 6, in the folded state, the foldable chair can be folded into a flat plane, and an overall thickness is optimized to a minimum.

Embodiment 2

Referring to FIGS. 10-12, Embodiment 2 differs from Embodiment 1 in that a structure of the sliding part 42 is different. Specifically, in Embodiment 2, the sliding part 42 comprises a connecting plate 421 and a sliding sleeve 423. The connecting plate 421 is connected to the positioning plate 46, and the sliding sleeve 423 is connected to the connecting plate 421 by a connecting pin 424. The sliding sleeve 423 can rotate relative to the connecting plate 421, the sliding sleeve 423 is sleeved on the side edge of the seat plate 10 from a lower side, and the sliding sleeve 423 is connected to the side edge of the seat plate 10 using a sliding fit. Further, the fixed part 44, the positioning plate 46, and the connecting plate 421 also form a U-shaped groove 48, which is the same as in Embodiment 1.

Preferably, the side edge of the seat plate 10 is disposed with a stopping structure corresponding to the sliding part 42, and the stopping structure blocks the sliding part 42 when the foldable chair is unfolded.

Preferably, an inner surface of the sliding sleeve 423 is disposed with a lining member 425, and the lining member 425 comprises a pressing strip 426. An inner side edge of the frame 12 comprises a pressing shoulder 122, and the pressing strip 426 is located on an upper side of the pressing shoulder 122, thereby inhibiting movement of the sliding sleeve 423 in a vertical direction.

Embodiment 3

Referring to FIGS. 13-15, Embodiment 3 differs from Embodiment 1 in that a structure of the sliding part 42 is different. Specifically, in Embodiment 3, the sliding part 42 defines a C-shaped structure, and the sliding part 42 is hooked on the side edge of the seat plate 10 from a lower side. The sliding part 42 comprises a sliding shaft 427, and a rail groove 15 is disposed on an inner side of the side edge of the seat plate 10 (e.g., the rail groove 15 is directly formed on the frame 12). The sliding shaft 427 is slidably assembled in the rail groove 15. It can be understood that the rail groove 15 can also be disposed on an outer side of the side edge of the seat plate 10, as shown in FIG. 16.

Preferably, a rear position of the side edge of the seat plate 10 comprises a blocking pin, and the blocking pin blocks the sliding part 42 after the foldable chair is unfolded.

Preferably, a rear position of a lower side of the side edge of the seat plate 10 comprises a buckling notch 16, and the sliding part 42 is buckled to the buckling notch 16 after the foldable chair is unfolded.

Preferably, the fixed part 44 is inserted into the front leg 20 from the rear side of the front leg 20.

Preferably, a concave step 114 is formed between left and right sides of the upper surface of the vacuum-formed plastic plate 11 and the folded edge 112, and a flange 116 protruding outward is formed on a top position of left and right sides of the folded edge 112.

Embodiment 4

Please refer to FIGS. 17-22, Embodiment 4 differs from Embodiment 3 in that a structure of the sliding part 42 is different. Specifically, in Embodiment 4, the sliding part 42 comprises a bottom frame 428 and a guiding protrusion 429. The guiding protrusion 429 is connected to an upper part of a side edge of the positioning plate 46, and the bottom frame 428 is connected to a lower part of the side edge of the positioning plate 46. A top of the bottom frame 428 comprises a notch 4281. The side edge of the seat plate 10 is supported by the bottom frame 428, and the notch 4281 is buckled to the side edge of the seat plate 10 from a lower side. The side edge of the seat plate 10 comprises a rail groove 17 corresponding to the guiding protrusion 429, and the guiding protrusion 429 slidably fits in the rail groove 17. It can be understood that the guiding protrusion 429 and the bottom frame 428 respectively limit movement of the side edge of the seat plate 10 in an upper and lower direction.

Preferably, the side edge of the seat plate 10 is disposed with a block 18 located on a rear side of the rail groove 17, and a rear position of the side edge of the seat plate 10 is disposed with a blocking pin 19. After the foldable chair is unfolded, the block 18 blocks the guiding protrusion 429, and the blocking pin 19 blocks the bottom frame 428. Of course, when the guiding protrusion 429 abuts a wall of a rear end of the rail groove 17, positioning the foldable chair in the unfolded state can be also achieved without the block 18 and the blocking pin 19.

The aforementioned description is only preferred embodiments of the present disclosure and the scope of the present disclosure cannot be limited thereto. That is, equivalent variations and modifications fall within the scope of the present disclosure provided that they are made based on the scope and the content of the specification of the present disclosure.

Claims

1. A foldable chair, comprising: a seat plate,two X-shaped supporting frames symmetrically arranged on left and right sides of the seat plate, andtwo sliding connecting members symmetrically disposed on the left and right sides of the seat plate, wherein: each of the two X-shaped supporting frames comprises a front leg and a rear leg pivotally connected to the front leg,the front leg and the rear leg are located outside of the seat plate,the rear leg is disposed between a side edge of the seat plate and the front leg in a lateral extending direction of the seat plate,an upper end of the rear leg is pivotally connected to a front position of the side edge of the seat plate,each of the two sliding connecting members comprises a sliding part slidably connected to the side edge of the seat plate, a fixed part connected to the front leg,and a positioning plate connected to and disposed between the sliding part and the fixed part, the positioning plate is located on a rear side of the front leg, andthe rear leg is configured to abut the positioning plate and align with the front leg in a left-and-right direction after the foldable chair is folded.

2. The foldable chair according to claim 1, wherein: the seat plate comprises a vacuum-formed plastic plate and a frame, four sides of the vacuum-formed plastic plate have a folded edge extending vertically downward,the frame is located on an inner side of the folded edge,a bottom of the frame comprises a pressing edge, andthe pressing edge goes around to an outer side of the folded edge from a lower side of the folded edge to press and secure a lower edge of the folded edge.

3. The foldable chair according to claim 2, wherein: the sliding part comprises 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,the side edge of the seat plate comprises an elongated sliding groove corresponding to the sliding pin, andthe sliding pin extends into an inner side of the frame.

4. The foldable chair according to claim 3, wherein: the side edge of the seat plate is disposed with a blocking pin located on a rear side of the elongated sliding groove, andwhen the foldable chair is unfolded, the blocking pin blocks the sliding pin.

5. The foldable chair according to claim 2, wherein: the sliding part comprises 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 by a connecting pin,the sliding sleeve is configured to rotate relative to the connecting plate,the sliding sleeve is sleeved on the side edge of the seat plate from a lower side of the side edge of the seat plate,the sliding sleeve is connected to the side edge of the seat plate using a sliding fit,the side edge of the seat plate is disposed with a stopping structure corresponding to the sliding part, andthe stopping structure blocks the sliding part when the foldable chair is unfolded.

6. The foldable chair according to claim 5, wherein: an inner surface of the sliding sleeve is disposed with a lining member,the lining member comprises a pressing strip,an inner side edge of the frame comprises a pressing shoulder, andthe pressing strip is located on an upper side of the pressing shoulder so as to inhibit movement of the sliding sleeve in a vertical direction.

7. The foldable chair according to claim 3, wherein: the fixed part is a flat plate structure,the fixed part is connected to an inner side edge of the front leg,the fixed part, the positioning plate, and the connecting plate form a U-shaped groove, andthe rear leg is received in the U-shaped groove after the foldable chair is folded.

8. The foldable chair according to claim 1, wherein: the sliding part comprises a sliding shaft,an inner side or an outer side of the side edge of the seat plate comprises a rail groove,the sliding shaft is slidably assembled in the rail groove,the sliding part defines a C-shaped structure,the sliding part is hooked on the side edge of the seat plate from a lower side of the side edge of the seat plate,a rear position of the side edge of the seat plate is disposed with a blocking pin, andthe blocking pin blocks the sliding part after the foldable chair is unfolded.

9. The foldable chair according to claim 8, wherein: a rear position of a lower side of the side edge of the seat plate comprises a buckling notch, andthe sliding part is buckled to the buckling notch after the foldable chair is unfolded.

10. The foldable chair according to claim 1, wherein: the sliding part comprises a bottom frame and a guiding protrusion,the guiding protrusion is connected to an upper part of a side edge of the positioning plate,the bottom frame is connected to a lower part of the side edge of the positioning plate,a top of the bottom frame comprises a notch,the side edge of the seat plate is supported by the bottom frame,the notch is buckled to the side edge of the seat plate from a lower side of the side edge of the seat plate,the side edge of the seat plate comprises a rail groove corresponding to the guiding protrusion, andthe guiding protrusion slidably fits in the rail groove.

11. The foldable chair according to claim 10, wherein: the side edge of the seat plate is disposed with a block located on a rear side of the rail groove,a rear position of the side edge of the seat plate is disposed with a blocking pin, andafter the foldable chair is unfolded, the block blocks the guiding protrusion, and the blocking pin blocks the bottom frame.

12. The foldable chair according to claim 1, wherein: the fixed part is inserted into the front leg from the rear side of the front leg.

13. The foldable chair according to claim 2, wherein: a concave step is formed between an upper surface of the vacuum-formed plastic plate and the folded edge.

14. The foldable chair according to claim 2, wherein: an upper surface of the vacuum-formed plastic plate is connected to the folded edge by a transition through a concave step and a flange laterally protruding outward in sequence.

15. The foldable chair according to claim 2, wherein: a concave step is formed between an upper surface of the vacuum-formed plastic plate and the folded edge, anda top position of left and right sides of the folded edge comprises a flange protruding outward.

16. The foldable chair according to claim 2, wherein: a concave step is formed between left and right sides of an upper surface of the vacuum-formed plastic plate and the folded edge, anda top position of left and right sides of the folded edge comprises a flange protruding outward.