A foldable chair back support structure and a folding chair

Abstract

This utility model discloses a foldable chair back support structure and a folding chair, including two back tubes and a chair back support unit disposed between the two back tubes. The chair back support unit includes two horizontal support tubes, an oblique support tube, and a connecting tube. A first connecting member is disposed between the two horizontal support tubes, and one end of each of the two horizontal support tubes is rotatably connected to the first connecting member, while the other end is rotatably connected to the corresponding back tube. One end of each of the two connecting tubes is rotatably connected to each other, while the other end is rotatably connected to the corresponding horizontal support tube. One end of each of the two oblique support tubes is rotatably connected to the corresponding back tube, while the other end is rotatably connected to the middle of the corresponding connecting tube. Connecting the back tubes, horizontal support tubes, oblique support tubes, and connecting tubes to form multiple sets of foldable four-bar linkages can effectively improve the support strength of the chair back, thereby ensuring its long service life.

Description

Technical Field

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

[0002] Folding chairs are indispensable for outdoor activities such as picnics and fishing, and can be folded up as a whole to reduce the space they take up.

[0003] The lifting and folding devices available on the market, such as the one described in utility model patent CN217610154U, have low backrest support strength, resulting in a shorter support life. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a foldable chair back support structure and a folding chair, which effectively improves the support strength of the chair back and thus ensures a long service life.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] This utility model provides a foldable chair back support structure, including two back tubes, characterized in that: it further includes a chair back support unit disposed between the two back tubes; the chair back support unit includes two horizontal support tubes, two diagonal support tubes, and two connecting tubes; a first connector is disposed between the two horizontal support tubes; one end of each of the two horizontal support tubes is rotatably connected to the first connector, and the other end is rotatably connected to the corresponding back tube; one end of each of the two connecting tubes is rotatably connected to each other, and the other end is rotatably connected to the corresponding horizontal support tube; one end of each of the two diagonal support tubes is rotatably connected to the corresponding back tube, and the other end is rotatably connected to the middle of the corresponding connecting tube; the back tubes, the horizontal support tubes, the diagonal support tubes, and the connecting tubes are connected to form multiple sets of foldable four-bar linkages.

[0007] Furthermore, each of the two connecting pipes has a second connecting member at one end opposite to the horizontal support pipe, and the two second connecting members are hinged to each other.

[0008] Furthermore, a third connector is provided between each of the two inclined support pipes and its corresponding connecting pipe, and the inclined support pipe is indirectly rotatably connected to the middle of its corresponding connecting pipe through the third connector.

[0009] Furthermore, the four-bar linkage is configured in three groups: two back tubes, one arranged to the left and the other to the right; two horizontal support tubes, one arranged to the left and the other to the right; two diagonal support tubes, one arranged to the left and the other to the right; and two connecting tubes, one arranged to the left and the other to the right. The inward end of the first horizontal support tube is rotatably connected to one end of the first connector, forming a first connection point; the inward end of the second horizontal support tube is rotatably connected to the other end of the first connector, forming a second connection point; the outward end of the first horizontal support tube is rotatably connected to the first back tube, forming a third connection point; the outward end of the second horizontal support tube is rotatably connected to the second back tube, forming a fourth connection point; the upper end of the first connecting tube is rotatably connected to the first horizontal support tube, forming a fifth connection point; the upper end of the second connecting tube is rotatably connected to the second horizontal support tube, forming a sixth connection point; and the lower ends of the first and second connecting tubes are hinged together, forming a seventh connection point. The lower end of the first inclined support tube is rotatably connected to the first back tube to form the eighth connection point; the lower end of the second inclined support tube is rotatably connected to the second back tube to form the ninth connection point; the first inclined support tube is rotatably connected to the middle of the first connecting tube to form the tenth connection point; and the second inclined support tube is rotatably connected to the middle of the second connecting tube to form the eleventh connection point. The first back tube, the third connection point, the first horizontal support tube, the fifth connection point, the first connecting tube, the tenth connection point, the first inclined support tube, and the eighth connection point together form a foldable first four-link. The first horizontal support tube, the first connection point, the second connection point, the first connector, the fifth connection point, the seventh connection point, the second horizontal support tube, the first connecting tube, and the second connecting tube together form a foldable second four-link. The second back tube, the fourth connection point, the second horizontal support tube, the sixth connection point, the second connecting tube, the eleventh connection point, the second inclined support tube, and the ninth connection point together form a foldable third four-link. The second four-link is located between the first four-link and the third four-link.

[0010] Furthermore, the first connector is provided with a handle to facilitate folding the chair back.

[0011] Furthermore, the first connector has two hinge slots, and the ends of the two horizontal support tubes opposite to the back tube are respectively hinged to the corresponding hinge slots.

[0012] Furthermore, both the horizontal support tube and the diagonal support tube are bent tubes, and the connecting tube is a straight tube, so that the chair back support structure protrudes backward.

[0013] This utility model provides a folding chair, which includes at least the aforementioned foldable backrest support structure.

[0014] Furthermore, it also includes armrests, which are equipped with position adjustment components for adjusting the backrest angle of the backrest support structure.

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

[0016] By connecting the back tube, the horizontal support tube, the diagonal support tube, and the connecting tube to form multiple sets of foldable four-bar linkages, the support strength of the chair back can be effectively improved, thereby ensuring its long service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the folding chair in the unfolded state in the embodiment.

[0018] Figure 2 This is a schematic diagram of a folding chair in the folding process described in the embodiment.

[0019] Figure 3 This is a schematic diagram of the folding chair in the folded state in the embodiment;

[0020] Figure 4 This is a schematic diagram of the foldable chair back support structure in the embodiment;

[0021] Figure 5 This is a schematic diagram of the first connector in the embodiment;

[0022] Figure 6 This is a schematic diagram of the second connector in the embodiment;

[0023] Figure 7 This is a schematic diagram of the third connector in the embodiment;

[0024] Figure 8 This is a schematic diagram of the horizontal support tube in the embodiment;

[0025] Figure 9 This is a schematic diagram of the inclined support tube in the embodiment. Detailed Implementation

[0026] 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.

[0027] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0028] Reference Figures 1 to 9 This embodiment provides a folding chair, including armrests 6, seat tubes 3, front support legs 4, rear support legs 5, and a foldable backrest support structure (hereinafter referred to as the backrest support structure 100).

[0029] like Figure 1 As shown, the backrest support structure 100 of this embodiment includes two back tubes 1 arranged on the left and right, and a backrest support unit 2 disposed between the two back tubes 1.

[0030] The chair back support unit 2 includes two horizontal support tubes, an oblique support tube, and a connecting tube arranged on the left and right.

[0031] Among them, the two back tubes 1 are the first back tube 11 and the second back tube 12 arranged on the left and right respectively, the two horizontal support tubes are the first horizontal support tube 211 and the second horizontal support tube 212 arranged on the left and right respectively, the two oblique support tubes are the first oblique support tube 213 and the second oblique support tube 214 arranged on the left and right respectively, and the two connecting tubes are the first connecting tube 215 and the second connecting tube 216 arranged on the left and right respectively.

[0032] A spacer is provided between the first horizontal support tube 211 and the second horizontal support tube 212. Figure 5 The first connector 217 shown has an inward end of the first horizontal support tube 211 rotatably connected to the left end of the first connector 217 to form a first connection point A. The inward end of the second horizontal support tube 212 is rotatably connected to the other right end of the first connector 217 to form a second connection point B. The outward end of the first horizontal support tube 211 is rotatably connected to the first back tube 11 to form a third connection point C. The outward end of the second horizontal support tube 212 is rotatably connected to the second back tube 12 to form a fourth connection point D. Specifically, the first connector 217 has two hinge slots arranged to the left and right. The inward ends of the first horizontal support tube 211 and the second horizontal support tube 212 are respectively hinged to the corresponding hinge slots.

[0033] The upper end of the first connecting pipe 215 is rotatably connected to the first horizontal support pipe 211, forming the fifth connection point E; the upper end of the second connecting pipe 216 is rotatably connected to the second horizontal support pipe 212, forming the sixth connection point F; the lower ends of the first connecting pipe 215 and the second connecting pipe 216 are respectively provided with... Figure 6 The second connector 218 shown is hinged to each other and forms a seventh connection point G, so that the lower ends of the first connecting tube 215 and the second connecting tube 216 form a rotatable connection.

[0034] The lower end of the first inclined support tube 213 is rotatably connected to the first back tube 11, forming the eighth connection point H. The lower end of the second inclined support tube 214 is rotatably connected to the second back tube 12, forming the ninth connection point I. The upper ends of the first inclined support tube 213 and the second inclined support tube 214 are respectively provided with the first connecting tube 215 and the second connecting tube 216. Figure 7The third connector 219 shown is used to rotatably connect the first inclined support tube 213 to the middle of the first connecting tube 215 and form the tenth connection point J. The second inclined support tube 214 is rotatably connected to the middle of the second connecting tube 216 and forms the eleventh connection point K through the corresponding third connector 219. The third connector 219 is close to the second connector 218.

[0035] The first back tube 11, the second back tube 12, the first horizontal support tube 211, the second horizontal support tube 212, the first diagonal support tube 213, the second diagonal support tube 214, the first connecting tube 215, and the second connecting tube 216 are connected to form three sets of foldable four-bar linkages.

[0036] In this embodiment, as Figure 4 As shown, the first back tube 11, the third connection point C, the first horizontal support tube 211, the fifth connection point E, the first connecting tube 215, the tenth connection point J, the first oblique support tube 213, and the eighth connection point H together form a foldable first four-link 21; the first horizontal support tube 211, the first connection point A, the second connection point B, the second horizontal support tube 212, the first connector 217, the fifth connection point E, the seventh connection point G, the first connecting tube 215, and the second connecting tube 216 together form a foldable second four-link 22; the second back tube 12, the fourth connection point D, the second horizontal support tube 212, the sixth connection point F, the second connecting tube 216, the eleventh connection point K, the second oblique support tube 214, and the ninth connection point I together form a foldable third four-link 23, and the second four-link 22 is located between the first four-link 21 and the third four-link 23.

[0037] In addition, such as Figure 6 As shown, the two second connectors 218 each adopt an L-shaped structure.

[0038] like Figure 2 and Figure 3 As shown, when the folding chair is folded up, the linkage between the first four-link 21, the second four-link 22 and the third four-link 23 enables the folding chair to be folded up quickly.

[0039] In summary, by connecting the backrest tube 1, the horizontal support tube, the diagonal support tube, and the connecting tube to form multiple sets of foldable four-bar linkages, the support strength of the chair back can be effectively improved, thereby ensuring its long service life.

[0040] Further preferred, such as Figure 8 and Figure 9As shown, the two horizontal support tubes and the diagonal support tubes are respectively bent tubes, straight connecting tubes, and the bent horizontal support tubes and diagonal support tubes together form the backrest structure, which has a rearward protruding shape. This can prevent the backrest fabric from directly contacting the backrest support structure after the folding chair is unfolded, improve the comfort of use, and prevent the backrest structure from digging into the user's back.

[0041] Of course, the bending shapes of the horizontal support tube and the diagonal support tube can also be exactly the same, so that the same component can be used, that is, a single component can be reused to reduce production costs.

[0042] More preferably, the upper end of the first connector 217 is provided with a handle 210 to facilitate folding the chair back.

[0043] When the folding chair is in such a position Figure 1 In the unfolded state shown, simply grasp the handle 210 and pull upwards to retract the backrest support structure 100, thereby achieving a quick and convenient folding of the entire folding chair, forming a shape as shown. Figure 3 The folded state shown.

[0044] In another preferred embodiment, the armrest 6 is provided with a stop adjustment member 61 for adjusting the backrest angle of the backrest support structure 100.

[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 foldable chair back support structure comprising two back tubes, characterised in that: It also includes a backrest support unit positioned between the two back tubes; The chair back support unit includes two horizontal support tubes, two diagonal support tubes, and two connecting tubes; a first connector is provided between the two horizontal support tubes; one end of each of the two horizontal support tubes is rotatably connected to the first connector, and the other end is rotatably connected to the corresponding back tube; one end of each of the two connecting tubes is rotatably connected to each other, and the other end is rotatably connected to the corresponding horizontal support tube; one end of each of the two diagonal support tubes is rotatably connected to the corresponding back tube, and the other end is rotatably connected to the middle of the corresponding connecting tube. The back tube, the horizontal support tube, the diagonal support tube, and the connecting tube are connected to form multiple sets of foldable four-bar linkages.

2. The foldable chair back support structure of claim 1, wherein: Two connecting pipes are provided with a second connecting member at one end opposite to the horizontal support pipe, and the two second connecting members are hinged to each other.

3. The foldable seat back support structure of claim 2, wherein: A third connector is provided between each of the two inclined support pipes and its corresponding connecting pipe, and the inclined support pipe is indirectly rotatably connected to the middle of its corresponding connecting pipe through the third connector.

4. The foldable chair back support structure of claim 1, wherein: The four-bar linkage consists of three groups: two back tubes arranged left and right (first and second back tubes); two horizontal support tubes arranged left and right (first and second horizontal support tubes); two diagonal support tubes arranged left and right (first and second diagonal support tubes); and two connecting tubes arranged left and right (first and second connecting tubes). The inward-facing end of the first horizontal support tube is rotatably connected to one end of the first connector, forming a first connection point. The inward-facing end of the second horizontal support tube is rotatably connected to the other end of the first connector, forming a second connection point. The outward-facing end of the first horizontal support tube is rotatably connected to the first back tube, forming a third connection point. The outward-facing end of the second horizontal support tube is rotatably connected to the second back tube, forming a fourth connection point. The upper end of the first connecting tube is rotatably connected to the first horizontal support tube, forming a fifth connection point. The upper end of the second connecting tube is rotatably connected to the second horizontal support tube, forming a sixth connection point. The lower ends of the first and second connecting tubes are hinged together, forming a seventh connection point. The lower end of the first inclined support tube is rotatably connected to the first back tube to form the eighth connection point. The lower end of the second inclined support tube is rotatably connected to the second back tube to form the ninth connection point. The first inclined support tube is rotatably connected to the middle of the first connecting tube to form the tenth connection point. The second inclined support tube is rotatably connected to the middle of the second connecting tube to form the eleventh connection point. The first back tube, the third connection point, the first horizontal support tube, the fifth connection point, the first connecting tube, the tenth connection point, the first inclined support tube, and the eighth connection point together form a foldable first four-link. The first horizontal support tube, the first connection point, the second connection point, the first connector, the fifth connection point, the seventh connection point, the second horizontal support tube, the first connecting tube, and the second connecting tube together form a foldable second four-link. The second back tube, the fourth connection point, the second horizontal support tube, the sixth connection point, the second connecting tube, the eleventh connection point, the second inclined support tube, and the ninth connection point together form a foldable third four-link. The second four-link is located between the first four-link and the third four-link.

5. The foldable chair back support structure of any one of claims 1-4, wherein: The first connector is provided with a handle to facilitate folding the chair back.

6. The foldable seat back support structure of claim 5, wherein: The first connector has two hinge slots, and the ends of the two horizontal support tubes opposite to the back tube are respectively hinged to the corresponding hinge slots.

7. The foldable chair back support structure of any one of claims 1-4, wherein: Both the horizontal support tube and the diagonal support tube are bent tubes, and the connecting tube is a straight tube, so that the chair back support structure protrudes backward.

8. A folding chair characterized by: It includes at least the foldable chair back support structure as described in any one of claims 1-7.

9. The folding chair of claim 8, wherein: It also includes armrests, which are equipped with position adjustment components for adjusting the backrest angle of the backrest support structure.

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