A folding chair back support structure and folding chair frame

Abstract

This utility model discloses a backrest support structure and folding chair frame for a folding chair, including two backrest rods, as well as vertical rods, a first horizontal rod, a second horizontal rod, a first connector, and a second connector. One end of each of the two first horizontal rods and the second horizontal rod is rotatably connected to the two backrest rods, and the other end of each of the two first horizontal rods is rotatably connected to both ends of the first connector. The other end of each of the two second horizontal rods is rotatably connected to both ends of the second connector. The two ends of each vertical rod are rotatably connected to the first connector and the second connector, forming a linked grid-shaped backrest frame. This can replace the traditional I-shaped backrest support structure and effectively improve its support strength to avoid deformation or damage during long-term use or under heavy loads, thereby ensuring its service life.

Description

Technical Field

[0001] This utility model relates to the field of folding chair technology, and in particular to a backrest support structure and folding chair frame for a folding chair. Background Technology

[0002] Currently, most folding chairs on the market have a simple I-shaped back support structure consisting of a single vertical bar and two horizontal bars. Therefore, this back support structure is prone to deformation or damage due to insufficient support strength when used for a long time or subjected to heavy loads, which ultimately affects its service life. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a backrest support structure and a folding chair frame for a folding chair, which can replace the traditional I-shaped backrest support structure and effectively improve its support strength, so as to avoid deformation or damage during long-term use or under heavy load, thereby ensuring its service life.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] This utility model provides a backrest support structure for a folding chair, including two backrest rods arranged opposite each other, two vertical rods, and an upper horizontal rod assembly and a lower horizontal rod assembly arranged at an upper and lower distance. The upper horizontal rod assembly includes two first horizontal rods and a first connector disposed between the two first horizontal rods. The lower horizontal rod assembly includes two second horizontal rods and a second connector disposed between the two second horizontal rods. One end of each of the two first horizontal rods and the second horizontal rods is rotatably connected to the two backrest rods, and the other end of each of the two first horizontal rods is rotatably connected to both ends of the first connector. The other end of each of the two second horizontal rods is rotatably connected to both ends of the second connector. The two ends of each vertical rod are rotatably connected to the first connector and the second connector, respectively, to form a linked grid-shaped backrest frame.

[0006] Furthermore, both the first connector and the second connector have two hinge slots that are opposite to each other in front and back, and the ends of the first crossbar and the second crossbar that are opposite to the backrest are respectively hinged to the corresponding hinge slots.

[0007] Furthermore, the two backrest rods are a left backrest rod and a right backrest rod, the two first crossbars are a first left crossbar and a first right crossbar, and the two second crossbars are a second left crossbar and a second right crossbar. The first left crossbar and the second left crossbar are respectively hinged to the left backrest rod, and the first right crossbar and the second right crossbar are respectively hinged to the right backrest rod. The first left crossbar is hinged to one of the hinge slots of the first connector on the side away from the left backrest rod, and the first right crossbar is hinged to the other hinge slot of the first connector on the side away from the right backrest rod. The second left crossbar is hinged to one of the hinge slots of the second connector on the side away from the left backrest rod, and the second right crossbar is hinged to the other hinge slot of the second connector on the side away from the right backrest rod. When the entire assembly is folded up, the two first crossbars are arranged in a crisscross pattern, and the two second crossbars are also arranged in a crisscross pattern.

[0008] Furthermore, the hinge groove is a square groove, and the two hinge grooves of the first connector are respectively provided with first slots that are opposite to each other on the left and right, and the two hinge grooves of the second connector are respectively provided with second slots that are opposite to each other on the left and right; the first slots and the second slots are respectively used to limit the rotation angle of the first crossbar and the second crossbar.

[0009] Furthermore, the outer wall of the hinge groove is provided with a clearance notch so that the first crossbar and the second crossbar can be hinged to the first connector and the second connector respectively through the hinge shaft.

[0010] Furthermore, the outer wall of the hinge groove is provided with a limiting frame for limiting the rotation angle of the vertical rod. The two limiting frames that cooperate with the same vertical rod have openings facing upward and downward respectively. Each vertical rod is hinged to the first connecting member and the second connecting member respectively and forms a hinge end. The hinge end is inserted into the corresponding limiting frame through the opening.

[0011] Furthermore, a handle is provided at the top of the first connector.

[0012] Furthermore, the first crossbar is a first bend; and / or, the second crossbar is a second bend.

[0013] Furthermore, the two backrest bars are parallel to each other.

[0014] This utility model provides a folding chair frame, including a seat tube, armrest tube, front leg tube, rear leg tube, leg support rod, and the aforementioned backrest support structure; the backrest rod of the backrest support structure is rotatably connected to the seat tube and the armrest tube respectively; the leg support rod is rotatably connected to the front leg tube.

[0015] The technical solution provided by this utility model has the following beneficial effects:

[0016] The two first and second horizontal bars are rotatably connected at one end to the two backrest bars, and the other ends of the two first horizontal bars are rotatably connected to the two ends of the first connector. The other ends of the two second horizontal bars are rotatably connected to the two ends of the second connector. The two ends of each vertical bar are rotatably connected to the first connector and the second connector, forming a linked and stable grid-shaped backrest frame. This can replace the traditional I-shaped chair back support structure and effectively improve its support strength to avoid deformation or damage during long-term use or under heavy load, thereby ensuring its service life. Attached Figure Description

[0017] Figure 1 The image shown is a first-view schematic diagram of the folding chair frame in the unfolded state in the embodiment.

[0018] Figure 2 The image shown is a second-view schematic diagram of the folding chair frame in the unfolded state in the embodiment.

[0019] Figure 3 The diagram shows the state of the folding chair frame during the semi-folding process in the embodiment.

[0020] Figure 4 The diagram shown is a schematic representation of the folding chair frame in the embodiment when it has been fully folded.

[0021] Figure 5 The diagram shows the first connector and the second connector in the embodiment.

[0022] Explanation of reference numerals in the attached figures:

[0023] 100: Chair back support structure; 1: Left backrest rod; 2: Right backrest rod; 3: Vertical rod; 4: Upper crossbar assembly; 41: First left crossbar; 42: First right crossbar; 43: First connector; 5: Lower crossbar assembly; 51: Second left crossbar; 52: Second right crossbar; 53: Second connector; 431: Hinge groove; 432: Handle; 433: First slot; 434: Limiting frame; 435: Clearance notch; 531: Second slot; 6: Seat post; 7: Armrest post; 8: Front leg post; 9: Rear leg post; 10: Support rod. Detailed Implementation

[0024] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0026] Reference Figures 1 to 5 This embodiment provides a folding chair frame, including two seat tubes 6, two armrest tubes 7, two front leg tubes 8, two rear leg tubes 9, two leg support rods 10, and a backrest support structure for the folding chair (hereinafter referred to as the backrest support structure 100).

[0027] like Figure 1 and Figure 2 As shown, the chair back support structure 100 of this embodiment includes two vertical rods 3, a left backrest rod 1 and a right backrest rod 2 arranged opposite each other to the left and right, and an upper crossbar assembly 4 and a lower crossbar assembly 5 arranged at an upper and lower distance. The upper crossbar assembly 4 includes a first left crossbar 41, a first right crossbar 42, and a first connecting member 43 disposed between the first left crossbar 41 and the first right crossbar 42. The lower crossbar assembly 5 includes a second left crossbar 51, a second right crossbar 52, and a second connecting member 53 disposed between the second left crossbar 51 and the second right crossbar 52. The left backrest rod 1 and the right backrest rod 2 are parallel to each other.

[0028] More specifically, such as Figure 1 and Figure 5 As shown, both the first connector 43 and the second connector 53 have two hinge grooves 431 that are opposite to each other in front and back.

[0029] like Figure 1 and Figure 2 As shown, the outward ends of the first left crossbar 41 and the second left crossbar 51 are respectively hinged to the left backrest 1, and the outward ends of the first right crossbar 42 and the second right crossbar 52 are respectively hinged to the right backrest 2. The first left crossbar 41 is hinged to one of the hinge slots 431 of the first connector 43 on the right side away from the left backrest 1, and the first right crossbar 42 is hinged to the other hinge slot 431 of the first connector 43 on the left side away from the right backrest 2. The second left crossbar 51 is hinged to one of the hinge slots 431 of the second connector 53 on the right side away from the left backrest 1, and the second right crossbar 52 is hinged to the other hinge slot 431 of the second connector 53 on the left side away from the right backrest 2, so as to form a linked grid-shaped backrest frame.

[0030] like Figure 3 and Figure 4 As shown, when the entire folding chair frame is folded or partially folded, the first left crossbar 41 and the second left crossbar 51 are intersecting each other, and the second left crossbar 51 and the second right crossbar 52 are also intersecting each other.

[0031] The chair back support structure 100 of this embodiment can form a linked and stable grid-shaped backrest frame, which can replace the traditional I-shaped chair back support structure 100 and effectively improve its support strength to avoid deformation or damage during long-term use or under heavy load, thereby ensuring its service life.

[0032] Of course, in other embodiments, the hinge point positions between the various crossbars and connectors in the same group are not limited to this. For example, the crossbar on the left can also be hinged to the left end of the corresponding connector, and the crossbar on the right can also be hinged to the right end of the corresponding connector.

[0033] In specific implementation, such as Figures 1 to 3 As shown, two backrest rods are respectively hinged to the rear ends of the seat tube 6 and armrest tube 7, and two leg support rods 10 are respectively hinged to the bottom of the two front leg tubes 8. The upper ends of the two front leg tubes 8 and the rear leg tube 9 are connected by a first hinge shaft. The middle part of the armrest tube 7 is provided with continuously distributed positioning tooth grooves. The first hinge shaft can be separably engaged in the positioning tooth grooves at different positions to change the tilt angle of the backrest support structure 100 relative to the seat tube 6, thereby realizing multi-position adjustment of the backrest angle.

[0034] When the backrest support structure 100 is adjusted to a larger tilt angle (such as a semi-reclining position), the user's legs can extend onto the footrest structure formed by the two leg support rods 10 and the chair fabric. Therefore, the multi-position adjustment of the backrest angle, in conjunction with the footrest structure, can provide users with a variety of usage states, from sitting upright to semi-reclining, thus enabling a variety of comfortable resting postures to be selected and meeting the user's comfort needs in different scenarios.

[0035] In another preferred embodiment, such as Figure 1 and Figure 5 As shown, the hinge groove 431 is a square groove. Specifically, the square grooves on the same side of the first connector 43 and the second connector 53 have first openings facing each other to avoid the rotation trajectory of each crossbar during the unfolding and folding process, and also serve as guides.

[0036] Furthermore, the two hinge slots 431 of the first connector 43 are respectively provided with first slots 433 that are opposite to each other on the left and right, and the two hinge slots 431 of the second connector 53 are respectively provided with second slots 531 that are opposite to each other on the left and right.

[0037] like Figure 1 As shown, when the folding chair frame is in the unfolded state, the first slot 433 and the second slot 531 are used to limit the rotation angle of each crossbar, thereby locking the shape of the chair back.

[0038] like Figure 4As shown, when the folding chair frame is folded, each crossbar, guided by its corresponding square groove, guides the entire grid-shaped backrest frame to fold together, thus achieving a bundle-like fold.

[0039] Further preferred, such as Figure 1 and Figure 5 As shown, each hinge groove 431 has a clearance notch 435 on its outer groove wall so that each crossbar can be hinged to the first connector 43 and the second connector 53 respectively through the second hinge shaft.

[0040] Further preferred, such as Figure 1 and Figure 5 As shown, each hinge slot 431 has a limiting frame 434 on its outer groove wall to limit the rotation angle of the vertical rod 3. The two limiting frames 434 that cooperate with the same vertical rod 3 have second openings facing upward and downward respectively. Each vertical rod 3 is hinged to the first connecting member 43 and the second connecting member 53 and forms a hinge end. Each hinge end is inserted into the corresponding limiting frame 434 through the second opening to ensure that the two vertical rods 3 always remain vertically parallel when unfolded or folded.

[0041] Further preferred, such as Figure 1 and Figure 5 As shown, the top of the first connector 43 is provided with a handle 432, so that when the folding chair frame is folded up, simply pull the handle 432 upwards to drive the entire backrest frame to move through the first connector 43, thus easily completing the folding action of the chair back.

[0042] Further preferred, such as Figure 1 As shown, the first left crossbar 41 and the first right crossbar 42 are both first curved tubes, and the second left crossbar 51 and the second right crossbar 52 are both second curved tubes, to ensure that the chair back contour better conforms to the curve of the human back, thus forming an ergonomic curved surface and improving the comfort of the chair back support structure 100. Of course, in other embodiments, the crossbars can also be straight tubes, but this would have an adverse effect on the comfort of the chair back support structure 100.

[0043] In summary, this embodiment can significantly improve the support strength of the chair back support structure 100, and adopts a grid-shaped backrest frame composed of two vertical bars 3, an upper horizontal bar assembly 4, a lower horizontal bar assembly 5, and two vertically parallel backrest bars to form a stable linkage support structure. At the same time, it greatly enhances the load-bearing capacity and torsional stiffness of the chair back, thereby extending the product's service life.

[0044] In addition, the backrest support structure 100 of this embodiment has the advantages of being simple and reliable, and users can easily achieve multi-position adjustment. Through the unique folding structure and handle design, the overall folding process is quick and effortless. It also efficiently integrates multiple functions such as stable support, backrest angle adjustment, footrest, and convenient folding.

[0045] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A backrest support structure for a folding chair, comprising two opposing backrest rods, characterized in that: It also includes two vertical bars, as well as an upper horizontal bar assembly and a lower horizontal bar assembly set at an upward and downward spacing; The upper crossbar assembly includes two first crossbars and a first connecting member disposed between the two first crossbars; the lower crossbar assembly includes two second crossbars and a second connecting member disposed between the two second crossbars. One end of each of the two first horizontal bars and the second horizontal bar is rotatably connected to the two backrest bars, the other end of each of the two first horizontal bars is rotatably connected to the two ends of the first connector, the other end of each of the two second horizontal bars is rotatably connected to the two ends of the second connector, and the two ends of each vertical bar are rotatably connected to the first connector and the second connector, so as to form a linked grid-shaped backrest frame.

2. The backrest support structure of the folding chair according to claim 1, characterized in that: Both the first connector and the second connector have two hinge slots that are opposite to each other in front and back. The ends of the first crossbar and the second crossbar that are opposite to the backrest are respectively hinged to the corresponding hinge slots.

3. The backrest support structure of the folding chair according to claim 2, characterized in that: The backrest has two backrest rods, a left backrest rod and a right backrest rod, two first crossbars, a first left crossbar and a first right crossbar, and two second crossbars, a second left crossbar and a second right crossbar. The first left crossbar and the second left crossbar are respectively hinged to the left backrest rod, and the first right crossbar and the second right crossbar are respectively hinged to the right backrest rod. The first left crossbar is hinged to one of the hinge slots of the first connector on the side away from the left backrest rod, and the first right crossbar is hinged to the other hinge slot of the first connector on the side away from the right backrest rod. The second left crossbar is hinged to one of the hinge slots of the second connector on the side away from the left backrest rod, and the second right crossbar is hinged to the other hinge slot of the second connector on the side away from the right backrest rod. When folded up, the two first crossbars and the two second crossbars are arranged in a crisscross pattern.

4. The backrest support structure of the folding chair according to claim 3, characterized in that: The hinge slot is a square groove. The two hinge slots of the first connector are respectively provided with first slots that are opposite to each other on the left and right. The two hinge slots of the second connector are respectively provided with second slots that are opposite to each other on the left and right. The first slots and the second slots are used to limit the rotation angle of the first crossbar and the second crossbar, respectively.

5. The backrest support structure of the folding chair according to claim 3, characterized in that: The outer wall of the hinge groove has a clearance notch so that the first crossbar and the second crossbar can be hinged to the first connector and the second connector respectively through the hinge shaft.

6. The backrest support structure of the folding chair according to claim 2, characterized in that: The outer wall of the hinge groove is provided with a limiting frame for limiting the rotation angle of the vertical rod. The two limiting frames that cooperate with the same vertical rod have openings facing upward and downward respectively. Each vertical rod is hinged to the first connector and the second connector respectively and forms a hinge end. The hinge end is inserted into the corresponding limiting frame through the opening.

7. The backrest support structure of the folding chair according to any one of claims 1-6, characterized in that: The first connector is provided with a handle at the top.

8. The backrest support structure of the folding chair according to any one of claims 1-6, characterized in that: The first crossbar is a first bend; and / or, the second crossbar is a second bend.

9. The backrest support structure of the folding chair according to any one of claims 1-6, characterized in that: The two backrest bars are parallel to each other.

10. A folding chair frame, characterized in that: The chair includes a seat tube, armrest tube, front leg tube, rear leg tube, leg support rod, and a backrest support structure as described in any one of claims 1-9; the backrest rod of the backrest support structure is rotatably connected to the seat tube and the armrest tube respectively; the leg support rod is rotatably connected to the front leg tube.

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