Folding chair

Abstract

The utility model discloses a folding chair which comprises a chair back, the chair back comprises two back pipes arranged in parallel, a chair back folding assembly is arranged between the two back pipes, the chair back folding assembly comprises a middle connecting piece and back supporting pipes on the two sides of the middle connecting piece, one end of each back supporting pipe is hinged to the middle connecting piece, and the other end of each back supporting pipe is hinged to the back pipe. The other end of the back supporting pipe is hinged to a back connecting piece, the back connecting piece is fixedly connected with the back pipe, a stopping part is arranged on the back connecting piece, and through the stopping part of the back connecting piece on the side of the chair back, the chair back folding assembly is positioned at a preset position when the chair frame is unfolded. The chair back folding assembly between the two back pipes can adopt a back supporting structure shaped like a Chinese character'wang 'or a double-lock back supporting structure, and has the advantages of being reasonable in structure, safe, reliable and the like.

Description

TECHNICAL FIELD

[0001] The utility model discloses a folding chair, especially relates to a chair with foldable backrest. BACKGROUND

[0002] Most folding chairs are designed as the structure that the chair body and the backrest are foldable, wherein the backrest is designed as X cross structure, such as the Chinese document CN 215737889 U discloses a folding fishing chair frame, two rear fork pipes are cross arranged, and long and short locking keys are arranged between the two rear fork pipes to prevent the chair frame from folding under the action of accidental external force. SUMMARY

[0003] In view of the defects of the prior art, the utility model provides a folding chair, which is designed by backrest support folding, and the rear back support piece is arranged transversely when unfolded, and has the advantages of reasonable structure, safety and stability.

[0004] To achieve the above object, the utility model is realized by the following technical scheme:

[0005] A folding chair comprises a backrest, the backrest comprises two back pipes arranged in parallel, a backrest folding assembly is arranged between the two back pipes, the backrest folding assembly comprises a middle connecting piece and back support pipes on both sides of the middle connecting piece, one end of the back support pipe is hinged to the middle connecting piece, the other end of the back support pipe is hinged to a back connecting piece, the back connecting piece is fixedly connected to the back pipe, a stop portion is arranged on the back connecting piece, and the stop portion of the back connecting piece can limit the rotation angle of the back support pipe when the backrest is unfolded.

[0006] Further, the backrest folding assembly is provided with two or more than two along the extension direction of the back pipe.

[0007] Further, the backrest folding assembly comprises a first folding assembly and a second folding assembly, a connecting rod is arranged between the first folding assembly and the second folding assembly, the first folding assembly comprises two transversely arranged back support pipes arranged in an upper and lower mode, the second folding assembly comprises a transversely arranged back support pipe, and each back support pipe and the middle connecting piece form a W-shaped back support structure.

[0008] Further, the backrest folding assembly comprises a first folding assembly and a second folding assembly, the first folding assembly comprises two transversely arranged back support pipes arranged in an upper and lower mode, the second folding assembly comprises two transversely arranged back support pipes arranged in an upper and lower mode, and each back support pipe and the middle connecting piece form a double-lock back support structure.

[0009] Furthermore, the first folding component includes an intermediate connector, a first hinge position is provided on one side of the intermediate connector for connecting to the first back support tube, a second hinge position is provided on one side of the intermediate connector for connecting to the second back support tube, and the distance from the first hinge position on one side of the intermediate connector to the center line of the intermediate connector is greater than the distance from the second hinge position on the same side of the intermediate connector to the center line of the intermediate connector.

[0010] Furthermore, a stop portion is provided on the intermediate connecting member to limit the rotation angle of the first back support tube when it is unfolded, and the middle portion of the intermediate connecting member is a through-hole structure.

[0011] Furthermore, the back connector includes a main body, a first mounting groove is provided on one side of the main body for matching with the back tube, and a second mounting groove is provided on the other side of the main body for matching with the back support tube. The back support tube is installed in the second mounting groove by riveting. One side wall of the second mounting groove is open, and a stop portion is formed on the open side. When the chair back is unfolded, the end of the back support tube contacts the stop portion and stops rotating. When the chair back is folded, the back support tube enters the side wall opening of the second mounting groove around the riveting axis and brings the two back tubes closer to the middle.

[0012] Furthermore, the bottom ends of the two back tubes of the chair back are respectively hinged to the seat, and the seat includes two front leg tubes, two rear leg tubes, two seat tubes, two front leg support tubes and a front cross tube. The two front leg tubes are parallel, and the front leg tubes and the rear leg tubes are riveted to form a herringbone support through front and rear leg connectors. The top end of the rear leg tube is connected to the armrest, and the rear end of the armrest is hinged to the back tube. The front leg support tube is connected to the seat tube through a sitting connector, and a front cross tube is provided between the two front leg support tubes.

[0013] Furthermore, the front foot support tube is matched with the front foot support lining tube, one end of the front foot support lining tube is riveted to the seat connector, and the other end of the front foot support lining tube is placed in the front foot support tube to form a telescopic structure. A button is provided on one side of the seat connector, and the button is connected to the positioning pin. The front foot support tube and the front foot support lining tube are matched with positioning holes. When the chair frame is unfolded, the front foot support lining tube retracts into the front foot support tube and is positioned by the positioning pin. When the chair frame is folded, the positioning pin is disengaged from the corresponding hole, and the front foot support lining tube is stretched in the front foot support tube to form an elongated sleeve.

[0014] Furthermore, the seat tube and the back tube are riveted vertically through the rear foot sliding sleeve. The rear foot sliding sleeve has a sleeve hole for the rear foot tube to pass through. The upper end of the rear foot tube is riveted to the gear adjustment member. There are multiple gears in the armrest. When the gear adjustment member is in different gears, different rear reclining angles of the chair back can be adjusted.

[0015] This utility model provides a folding chair with a backrest that securely and reliably positions the folding back assembly at a preset position when the chair frame is unfolded, using a stopper on the side backrest connector. The folding back assembly between the two backrest tubes has two structural modes: one adopting a "K"-shaped back support structure and the other adopting a double-locking back support structure. These advantages are reasonable structure and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram of an expanded state of an embodiment of the present utility model.

[0017] Figure 2 This is a diagram of a folded state of an embodiment of the utility model.

[0018] Figure 3 This is a diagram of another folded state of an embodiment of the utility model.

[0019] Figure 4 It is a schematic diagram of the back connecting piece of the utility model.

[0020] Figure 5 It is a schematic diagram of the back connecting piece of the utility model.

[0021] Figure 6 It is a schematic diagram of another embodiment of the back connecting piece of the present utility model.

[0022] Figure 7 It is a diagram of the expanded state of another embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings:

[0024] Example: See Figures 1 to 6 A folding chair includes a backrest, which includes two back tubes 1 arranged in parallel, a backrest folding assembly 2 is provided between the two back tubes 1, the backrest folding assembly 2 includes an intermediate connector 3 and back support tubes 4 on both sides of the intermediate connector, one end of the back support tube 4 is hinged to the intermediate connector 3, and the other end of the back support tube 4 is hinged to the back connector 5, the back connector 5 is fixedly connected to the back tube 1, and a stop portion 51 is provided on the back connector 5, which can limit the rotation angle of the back support tube 4 when the chair back is unfolded.

[0025] In the embodiment of the present invention, the various tubes of the chair frame are not limited to hollow tubes, and can also be solid or rod-like structures. Two or more chair back folding components 2 are provided along the extending direction of the back tube to form a more stable support.

[0026] In one embodiment of the present invention, Figure 1 、 Figure 2The chair back folding assembly 2 includes a first folding assembly 21 and a second folding assembly 22, with a connecting rod or tube 6 disposed between the first and second folding assemblies. The first folding assembly includes two horizontally arranged back support tubes 4 arranged one above the other, and the second folding assembly 22 includes a single horizontally arranged back support tube 4. The back support tubes and the intermediate connector form a "W"-shaped back support structure. The first folding assembly 21 includes an intermediate connector 3, one side of which is provided with a first hinge 31 for connecting to the first back support tube, and one side of which is provided with a second hinge 32 for connecting to the second back support tube. The distance from the first hinge 31 on one side of the intermediate connector 3 to the centerline of the intermediate connector 3 is greater than the distance from the second hinge 32 on the same side of the intermediate connector 3 to the centerline of the intermediate connector 3.

[0027] like Figure 1 、 Figure 2 In one embodiment of the present invention, a stopper is provided on the intermediate connecting member 3 to limit the rotation angle when the first back support tube is unfolded. The intermediate connecting member 3 is a structure that is larger at the top and smaller at the bottom, and the middle portion of the intermediate connecting member 3 is a through-hole structure. Figure 4 、 Figure 5 The back connector 5 includes a main body 51, a first mounting groove 52 is provided on one side of the main body for matching with the back tube, and the bottom of the first mounting groove 52 has a mounting hole 56 to match one of the back support tubes. A second mounting groove 53 is provided on the other side of the main body 5 for matching with the other back support tube. The back support tube 4 is installed in the second mounting groove 53 by riveting. A side wall opening 54 of the second mounting groove 53 is formed on the side of the opening, and a stop portion 55 is formed on the open side. When the backrest is unfolded, the end of the back support tube 4 contacts the stop portion 55 and stops rotating. When the backrest is folded, the back support tube enters the side wall opening 54 of the second mounting groove around the riveting axis and brings the two back tubes 1 closer to the middle. The extension direction L1 of the second mounting groove is perpendicular to the extension direction L2 of the first mounting groove. Figure 6 The middle back connector 6 is matched Figure 1 In the second folding assembly 22 , the first mounting groove 61 of the back connector structure cooperates with the back tube, the second mounting groove 62 cooperates with the back support tube, and one side wall of the second mounting groove is open, with a stopper 63 formed on the open side.

[0028] See also Figure 1 、 Figure 2The bottom ends of the two back tubes 1 of the chair back are respectively hinged to the seat. The seat includes two front leg tubes 7, two rear leg tubes 8, two seat tubes 9, two front leg support tubes 10 and a front cross tube. The two front leg tubes 7 are parallel. The front leg tubes 7 and the rear leg tubes 8 are riveted to form a herringbone support through the front and rear leg connectors 11. The top of the rear leg tube 8 is connected to the armrest 12, and the rear end of the armrest 12 is hinged to the back tube 1. The front leg support tube 10 is connected to the seat tube 9 through the sitting connector 13. A front cross tube is provided between the two front leg support tubes 10. The front foot support tube 10 cooperates with the front foot support inner lining tube 14, one end of the front foot support inner lining tube 14 is riveted to the sitting connector 13, and the other end of the front foot support inner lining tube 14 is placed in the front foot support tube 10 to form a telescopic structure. A button is provided on one side of the sitting connector 13, and the button is connected to the positioning pin. The front foot support tube 10 and the front foot support inner lining tube 14 are cooperated to have positioning holes. When the chair frame is unfolded, the front foot support inner lining tube 14 retracts into the front foot support tube 10 and is positioned by the positioning pin. When the chair frame is folded, the positioning pin is separated from the corresponding hole, and the front foot support inner lining tube 14 is stretched in the front foot support tube 10 to form an elongated sleeve, such as Figure 1 、 Figure 2 、 Figure 3 The seat tube 9 and the back tube 1 are riveted vertically together via a rear leg sleeve 15. In the unfolded state, the rear leg sleeve 15 has a hole for the rear leg tube 8 to pass through. The upper end of the rear leg tube is riveted to the shift member. The armrest 12 is provided with multiple gears. When the shift member is in different gears, different rear reclining angles of the chair back are adjusted.

[0029] See also Figure 7 The chair back folding assembly 2 of the present invention includes a first folding assembly 21 and a second folding assembly 22. The first folding assembly 21 includes two horizontally arranged back support tubes arranged up and down. Figure 1 The first folding assembly in the embodiment is the same as the first folding assembly, including the middle connecting piece 3, the back support tubes 4 on both sides and the back connecting piece 5. The second folding assembly has the same structure as the first folding assembly, and includes two horizontally arranged back support tubes arranged above and below. Each back support tube and the middle connecting piece form a double-lock back support structure. The other structures of the folding chair in this embodiment are the same as the first folding assembly. Figure 1 The structures in the embodiments are the same and will not be described again here.

[0030] The utility model provides a folding chair, such as Figures 1 to 6, including two rear leg pipes 8, two front leg pipes 7, two front leg support pipes 10, two front leg support inner lining pipes 14, two front short cross pipes, a front cross pipe, a cross center connector, two seat pipes 9, two back pipes 1, two sitting connectors 13, two armrests 12, two front-rear leg connectors 11, two rear leg sliding sleeves 15, six back support pipes 4; the two front leg pipes 7 are parallel; the bottom ends of the two front leg pipes 7 are riveted with the two front leg support pipes 10, and the two front leg support pipes 10 are parallel; the front ends of the two front leg pads are riveted with a front short cross pipe and a front cross pipe; the two front short cross pipes and the front cross pipe are riveted in X type through a cross connector; the front short cross pipe, the front cross pipe, the front leg support pipe and the front leg pipe are respectively riveted with the pipe plug; the telescopic sleeve inside the pipe is connected with the front leg support pipe and arranged at the pipe opening of the front leg support pipe, and the two front leg support pipes are parallel; one end of the front leg support inner lining pipe 14 is riveted with the sitting connector 13, and the front end of the sitting connector 13 is riveted with the front cross pipe and the other front short cross pipe; the side end of the sitting connector is matched with the button; the upper end of the sitting connector is riveted with the seat pipe 9; the seat pipe and the back pipe are riveted vertically through the rear leg sliding sleeve; the front leg pipe 7 is riveted with the rear leg pipe 8 through the front-rear leg connector; the upper end of the rear leg pipe 8 is riveted with the gear adjusting plastic piece; the rear leg pipe 8 is matched with the armrest through the gear adjusting plastic piece; the lower end of the rear leg pipe 8 is riveted with the rear leg pad; one end of the two lowermost back support pipes is riveted with the back pipe through the back connector 6, the other end is riveted with the back bottom connector (i.e. Figure 1 the middle connector on the lower side), the upper end of the back bottom connector is hinged with the connecting rod or connecting pipe and the back lock connector (i.e. Figure 1 the middle connector on the upper side), the back lock connector is riveted with the four back support pipes, and the other end of the four back support pipes is connected with the back pipe through the back connector 5.

[0031] When the chair frame is folded, the button is pressed, the seat pipe 9 and the armrest 12 are lifted upward, the seat pipe 9 pulls the front leg support inner lining pipe 14 to stretch out, the middle connector 3 goes upward, the back support pipes 4 on both sides rotate, the outer end of the back support pipe 4 pulls the two back pipes 1 to close to the center, at the same time, the front cross pipe is retracted to drive the front leg support pipe 10 to fold, and finally the folding state is as shown in Figure 2 、 Figure 3 .

[0032] The above description is only an embodiment using the technical content of the present application, and any modification and change made by those skilled in the art using the present application is within the patent range claimed by the present application, and is not limited to the embodiments disclosed.

Claims

1. A folding chair, characterized in that: The chair back comprises two back tubes arranged in parallel, a chair back folding assembly is provided between the two back tubes, the chair back folding assembly comprises an intermediate connector and back support tubes on both sides of the intermediate connector, one end of the back support tube is hinged to the intermediate connector, the other end of the back support tube is hinged to the back connector, the back connector is fixedly connected to the back tube, a stop portion is provided on the back connector, and the stop portion of the back connector can limit the rotation angle of the back support tube when the chair back is unfolded.

2. A folding chair according to claim 1, characterized in that: Two or more seat back folding components are provided along the extending direction of the back tube.

3. The folding chair according to claim 1, characterized in that: The chair back folding assembly includes a first folding assembly and a second folding assembly, and a connecting rod or connecting tube is provided between the first folding assembly and the second folding assembly. The first folding assembly includes two horizontally arranged back support tubes arranged upper and lower, and the second folding assembly includes a horizontally arranged back support tube. Each back support tube and the intermediate connecting piece form a K-shaped back support structure.

4. The folding chair according to claim 1, characterized in that: The chair back folding assembly includes a first folding assembly and a second folding assembly. The first folding assembly includes two horizontally arranged back support tubes arranged upper and lower, and the second folding assembly includes two horizontally arranged back support tubes arranged upper and lower. Each back support tube and the intermediate connecting piece form a double-lock back support structure.

5. A folding chair according to claim 3 or 4, characterized in that: The first folding assembly includes an intermediate connector, a first hinge position is provided on one side of the intermediate connector for connecting to the first back support tube, a second hinge position is provided on one side of the intermediate connector for connecting to the second back support tube, and the distance from the first hinge position on one side of the intermediate connector to the center line of the intermediate connector is greater than the distance from the second hinge position on the same side of the intermediate connector to the center line of the intermediate connector.

6. The folding chair according to claim 1, characterized in that: A stopper is provided on the middle connecting member to limit the rotation angle of the first back support tube when it is unfolded, and the middle part of the middle connecting member is a through-hole structure.

7. A folding chair according to claim 1, 3, 4 or 6, characterized in that: The back connector includes a main body, a first mounting groove is provided on one side of the main body for matching with the back tube, and a second mounting groove is provided on the other side of the main body for matching with the back support tube. The back support tube is installed in the second mounting groove by riveting. One side wall of the second mounting groove is open, and a stop portion is formed on the open side. When the chair back is unfolded, the end of the back support tube contacts the stop portion and stops rotating. When the chair back is folded, the back support tube enters the side wall opening of the second mounting groove around the riveting axis and brings the two back tubes closer to the middle.

8. The folding chair according to claim 1, characterized in that: The bottom ends of the two back tubes of the chair back are respectively hinged to the seat. The seat includes two front leg tubes, two rear leg tubes, two seat tubes, two front leg support tubes and a front cross tube. The two front leg tubes are parallel, and the front leg tubes and the rear leg tubes are riveted to form a herringbone support through front and rear leg connectors. The top end of the rear leg tube is connected to the armrest, and the rear end of the armrest is hinged to the back tube. The front leg support tube is connected to the seat tube through a sitting connector, and a front cross tube is provided between the two front leg support tubes.

9. The folding chair according to claim 8, characterized in that: The front foot support tube cooperates with the front foot support lining tube, one end of the front foot support lining tube is riveted to the seat connector, and the other end of the front foot support lining tube is placed in the front foot support tube to form a telescopic structure. A button is provided on one side of the seat connector, and the button is connected to the positioning pin. The front foot support tube and the front foot support lining tube are cooperated with each other to provide positioning holes. When the chair frame is unfolded, the front foot support lining tube retracts into the front foot support tube and is positioned by the positioning pin. When the chair frame is folded, the positioning pin is disengaged from the corresponding hole, and the front foot support lining tube is stretched in the front foot support tube to form an elongated sleeve.

10. A folding chair according to claim 8 or 9, characterized in that: The seat tube and the back tube are riveted vertically through the rear foot sliding sleeve. The rear foot sliding sleeve has a sleeve hole for the rear foot tube to pass through. The upper end of the rear foot tube is riveted to the gear adjustment piece. There are multiple gears in the armrest. When the gear adjustment piece is in different gears, different rear reclining angles of the chair back can be adjusted.

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