A folding chair

Abstract

The utility model provides a folding chair, including chair back frame, seat frame and the backrest adjusting mechanism connected between both, chair back frame and seat frame articulate, chair back frame rotates around articulation point, seat frame includes two front support leg tubes, two seat leg tubes, and the front support leg tube and seat leg tube constitute seat surface support and rear support leg of seat simultaneously, the backrest adjusting mechanism includes two handrails and two handrail support tubes, the handrail relative to handrail support tube sliding and limiting, the chair back frame rotates around the articulation point of chair back frame and seat frame in sliding stroke, realizes the adjustment of backrest angle, has stable structure, easy operation, small after folding volume, safe and reliable and so on.

Description

Technical Field

[0001] This utility model relates to the field of outdoor leisure products technology, specifically to a folding chair that is structurally stable, easy to store, and has an adjustable backrest angle. Background Technology

[0002] Existing folding chairs generally suffer from the following problems: First, their complex structure and numerous parts result in a large overall weight, making them inconvenient to carry; second, the folding and unfolding process is cumbersome, leading to a poor user experience; third, most folding chairs have a fixed backrest angle that cannot be adjusted, making it difficult to meet users' different comfort needs. Although some products offer backrest adjustment functions, their adjustment mechanisms are usually exposed, posing a safety hazard of pinching users' fingers or sleeves, especially in outdoor leisure scenarios where quick and easy operation is required, where these drawbacks are particularly prominent.

[0003] Therefore, there is an urgent need for an adjustable backrest folding chair that is simple in structure, lightweight, easy to fold, safe to adjust, and ergonomic. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, this utility model provides a folding chair with adjustable backrest angle, which solves the problems of complex structure, inconvenient adjustment and safety hazards in the existing technology.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A folding chair, comprising: The chair back frame includes two back tubes and a folding assembly between the two back tubes; The seat frame and the backrest frame are hinged together. The backrest frame rotates around the hinge point. The seat frame includes two front support leg tubes and two seat leg tubes. The front support leg tubes and the seat leg tubes together form the seat surface support and the rear support leg of the seat. The backrest adjustment mechanism includes two armrests and two armrest support tubes. The armrest support tubes are slidably connected to the armrests. The rear part of the armrest is hinged to the middle part of the corresponding side backrest tube in the chair back frame. The middle part of the armrest support tube is hinged to the corresponding side seat leg tube. The bottom of the armrest support tube is connected to the corresponding side front support leg tube. The armrest slides and is limited relative to the armrest support tube. During the sliding stroke, the backrest frame rotates around the hinge point between the backrest frame and the seat frame to adjust the backrest angle.

[0006] Furthermore, the folding assembly includes a vertically arranged central connecting tube, two upper support tubes, two lower support tubes, an upper hinge, and a lower hinge. The inner ends of the two upper support tubes are hinged to the upper end of the central connecting tube through the upper hinge; the inner ends of the two lower support tubes are hinged to the lower end of the central connecting tube through the lower hinge. The two upper support tubes, the two lower support tubes, and the central connecting tube together form a stable "I"-shaped structure.

[0007] Furthermore, the outer ends of the upper and lower support tubes are connected to the back tube, and the upper and lower support tubes have a consistent curvature, so that the chair back presents an arc shape that bulges backward from the middle when unfolded.

[0008] Furthermore, the upper hinge member is provided with a mounting groove for accommodating the end of the upper support tube, and a limiting part is formed on one side wall of the mounting groove to limit the rotation angle of the upper support tube; the lower hinge member is provided with a mounting groove for accommodating the end of the lower support tube, and a limiting part is formed on one side wall of the mounting groove to limit the rotation angle of the lower support tube; the upper hinge member and the lower hinge member are provided with mounting holes for accommodating the central connecting tube on opposite sides.

[0009] Furthermore, the seat frame includes lateral hinges, and the backrest frame is hinged to the lateral hinges of the seat frame.

[0010] Furthermore, the lateral hinge has a mounting hole for engaging the front outrigger tube and a mounting groove for accommodating the back tube. The back tube in the mounting groove is connected to the lateral hinge via a hinge shaft. One side of the mounting groove is open to allow the back tube to rotate about the hinge shaft toward the open side.

[0011] Furthermore, the outer end of the lower support tube of the folding assembly is hinged to the lateral hinge, which distributes the force on the backrest frame through the lateral hinge on the seat frame, thus avoiding excessive force concentration on the back tube.

[0012] Furthermore, the seat frame includes two front cross tubes, which cross and hinge at the middle. The two leg tubes are located on the left and right sides of the seat. The middle of each leg tube is hinged to the upper end of the front support leg tube on the same side through a lateral hinge. The upper part of the leg tube is connected to the upper end of the front cross tube through a seat tube connector. The lower end of the front cross tube is hinged to the lower end of the front support leg tube through a front foot seat. The lower end of the leg tube is fitted with a rear foot seat. The leg tube is an integral arc-shaped tube with a seat tube section and a rear leg tube section.

[0013] Furthermore, the handrail has a hollow structure with an opening on its lower side and a sliding groove along its length inside, which has multiple positioning positions. The upper end of the handrail support tube is fitted with a T-shaped slider. The T-shaped slider has a protruding horizontal axis, which is housed in the sliding groove of the handrail and can slide along it and be positioned at different positions.

[0014] Furthermore, the lower end of the handrail support tube is hinged to the sliding sleeve, which is fitted onto the front support leg tube. When folded, the sliding sleeve slides along the front support leg tube.

[0015] The beneficial effects of this utility model are as follows: 1. This utility model relates to a folding chair, wherein the backrest support angle can be adjusted via the armrests.

[0016] 2. When folding this utility model, lift the folding component of the chair back frame upwards, and the chair back frame will fold up. At the same time, the chair back frame, seat frame and backrest adjustment mechanism will fold into a compact whole, making the operation extremely simple.

[0017] 3. The backrest adjustment design of this utility model is embedded inside the armrest, which improves safety.

[0018] 4. This utility model folding chair has the advantages of stable structure, simple operation, small size after folding, and safety and reliability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first embodiment of the present invention.

[0020] Figure 2 This is an unfolded side view of the first embodiment of this utility model.

[0021] Figure 3 This is a schematic diagram of the first embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the chair back frame of this utility model.

[0023] Figure 5 This is a first schematic diagram of the upper hinge component of this utility model.

[0024] Figure 6 This is a second schematic diagram of the upper hinge component of this utility model.

[0025] Figure 7 This is a schematic diagram of the lower hinge component of this utility model.

[0026] Figure 8 This is a schematic diagram of the seat frame of this utility model.

[0027] Figure 9 This is a schematic diagram of the lateral hinge component of this utility model.

[0028] Figure 10 This is a schematic diagram of the front foot seat of this utility model.

[0029] Figure 11 This is a schematic diagram of the rear foot seat of this utility model.

[0030] Figure 12This is a schematic diagram of the backrest adjustment mechanism of this utility model.

[0031] Figure 13 This is a schematic diagram of the handrail support tube of this utility model.

[0032] Figure 14 This is a schematic diagram of the T-shaped slider of this utility model.

[0033] Figure 15 This is a schematic diagram of the sliding sleeve of this utility model.

[0034] Figure 16 This is a schematic diagram of the handrail of this utility model.

[0035] Figure 17 This is a cross-sectional view of the handrail of this utility model.

[0036] Figure 18 This is a schematic diagram of the unfolded state of the second embodiment of this utility model.

[0037] Figure 19 This is a schematic diagram of the folded state of the second embodiment of this utility model. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings: 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. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0039] Example 1: This utility model discloses a folding chair, such as Figures 1 to 17 As shown, the chair includes a backrest frame 1, a seat frame 2, a backrest adjustment mechanism 3, and a matching chair fabric. The backrest frame 1 includes two backrest tubes 11 and a folding assembly 12 between the two backrest tubes. The backrest frame 1 is hinged to the seat frame 2, and the backrest frame 1 rotates around the hinge point. The seat frame 2 includes two front support leg tubes 21 and two seat leg tubes 22, which together form the seat surface support and the rear support legs of the chair. The backrest adjustment mechanism 3 includes two armrests 31 and two... The armrest support tube 32 is slidably connected to the armrest 31. The rear part of the armrest 31 is hinged to the middle part of the corresponding side backrest tube 11 in the backrest frame 1. The middle part of the armrest support tube 32 is hinged to the corresponding side seat leg tube 22. The bottom of the armrest support tube 32 is connected to the corresponding side front support leg tube 21. The armrest 31 slides and is limited relative to the armrest support tube 32. During the sliding stroke, the backrest frame 1 rotates around the hinge point between the backrest frame 1 and the seat frame 2 to adjust the backrest angle.

[0040] Please see Figure 1 , Figure 2 and Figures 4 to 7 In one embodiment of this utility model, the folding assembly 12 includes a vertically arranged central connecting tube 121, two upper support tubes 122, two lower support tubes 123, an upper hinge 124, and a lower hinge 125. The inner ends of the two upper support tubes 122 are hinged to the upper end of the central connecting tube 121 through the upper hinge 124; the inner ends of the two lower support tubes 123 are hinged to the lower end of the central connecting tube 121 through the lower hinge 125. The two upper support tubes 122, the two lower support tubes 123, and the central connecting tube 121 together form a stable "I"-shaped structure. The outer ends of the upper support tubes 122 and the lower support tubes 123 are connected to the back tube 11. The upper and lower support tubes have a consistent curvature, and the chair back presents an arc shape with the middle protruding backward when unfolded. Figure 5 , Figure 6 As shown, the upper hinge 124 is provided with a mounting groove 126 for accommodating the end of the upper support tube, and the upper sidewall of the mounting groove forms a limiting portion 128 to limit the rotation angle of the upper support tube 122; as Figure 7 As shown, the lower hinge member 125 is provided with a mounting groove 126 for accommodating the end of the lower support tube, and one side wall of the mounting groove forms a limiting portion to restrict the rotation angle of the lower support tube; as Figure 4 , Figure 6 and Figure 7 The upper hinge 124 and the lower hinge 125 are provided with mounting holes 127 on opposite sides to accommodate the central connecting pipe. The mounting holes 127 are located in the middle position, and the mounting grooves 126 are located on both sides of the mounting holes to facilitate the connection of the corresponding support pipes.

[0041] Please see Figure 1 , Figures 8 to 11 In one embodiment of this utility model, the seat frame 2 includes a lateral hinge 23, and the backrest frame 1 is hinged to the lateral hinge 23 of the seat frame 2. Figure 9 As shown, the lateral hinge 23 has a mounting hole 231 for engaging the front outrigger tube 21 and a mounting groove 232 for accommodating the back tube 11. The seat leg tube 22 is located on one side of the lateral hinge 23 and is hinged to the lateral hinge. The back tube 11 in the mounting groove is connected to the lateral hinge 23 via a hinge shaft. One side of the mounting groove 232 is open to allow the back tube 11 to rotate about the hinge shaft toward the open side. Figure 8As shown, the seat frame 2 includes two front cross tubes 24, which cross and are hinged at the middle. Two leg tubes 22 are located on the left and right sides of the seat. The middle of each leg tube 22 is hinged to the upper end of the front support leg tube 21 on the same side via a lateral hinge 23. The upper part of the leg tube 22 is connected to the upper end of the front cross tube 24 via a seat tube connector 25. The lower end of the front cross tube 24 is hinged to the lower end of the front support leg tube 21 via a front footrest 26. A rear footrest 27 is fitted onto the lower end of the leg tube 22. Figure 10 , Figure 11 As shown, anti-slip textures are provided on the grounding surfaces of both the front foot seat 26 and the rear foot seat 27. In one embodiment of this utility model, the leg tube 22 is an integral arc-shaped tube, having a seat tube portion and an extending rear leg tube portion, wherein the seat tube portion provides seat support and the rear leg tube portion provides rear support leg function.

[0042] Please see Figure 1 , Figures 12 to 17 In one embodiment of this utility model, the armrest 31 of the backrest adjustment mechanism 3 has a hollow structure with an opening on its lower side and a sliding groove 311 along its length inside. This sliding groove has multiple positioning positions 312. Figure 13 , Figure 14 As shown, a T-shaped slider 33 is sleeved at the upper end of the handrail support tube 32. The T-shaped slider 33 has a protruding horizontal shaft 331, which is accommodated in the sliding groove 311 of the handrail and can slide along it and be positioned at different positions. Figure 12 , Figure 16 ,and Figure 17 As shown, the sliding grooves 311 inside the armrest 31 are set on the opposite side walls of the hollow armrest and cooperate with the T-shaped slider 33 to realize sliding and gear control. The lower end of the armrest support tube 32 is hinged to the sliding sleeve 34, which is sleeved on the front support leg tube 21. When folded, the sliding sleeve 34 slides along the front support leg tube. The position of the sliding sleeve 34 when the folding chair is fully unfolded is as shown. Figure 1 As shown, the position of the sliding sleeve 34 when the folding chair is in the folded state is as follows: Figure 3 As shown.

[0043] The working description and beneficial effects of this utility model are as follows: When the backrest angle needs to be adjusted, the user leans back and pushes the T-shaped slider backward through the groove in the armrest to the desired position. This process causes the entire backrest frame to rotate around its hinge point with the seat frame (lateral hinge), thus achieving stepless or stepped adjustment of the backrest angle. Because the adjustment mechanism is built into the armrest, the risk of pinching injuries from exposed mechanisms is avoided, ensuring safety and reliability.

[0044] When folding, lift the upper hinge of the backrest frame upwards, and the backrest frame will fold in. At the same time, the sliding sleeve in the backrest adjustment mechanism will slide upwards along the front support leg tube, causing the armrest support tube to fold in, ultimately making the backrest frame, seat frame, and backrest adjustment mechanism fold into a compact whole, which is extremely easy to operate.

[0045] This utility model discloses a folding chair with an adjustable backrest angle, which mainly includes: a backrest frame, a seat frame, and a backrest adjustment mechanism connecting the two.

[0046] 1. The upper and lower hinges of the chair back frame are equipped with mounting grooves for accommodating the ends of tubular components. These grooves not only secure the components but also limit their rotation angle, ensuring structural stability when unfolded. For folding, simply lift the upper hinge upwards, and the entire chair back frame will converge towards the center, achieving quick folding.

[0047] Because the upper and lower support tubes have the same curvature, the backrest presents an arc shape that bulges backward in the middle when unfolded, providing good wrapping and support for the back of the user, which conforms to ergonomic design and improves the comfort of use.

[0048] 2. The seat frame includes: two front support leg tubes; two seat leg tubes, which simultaneously form the seat surface support and rear support legs; two front cross tubes; two lateral hinges; two seat post connectors; two front footrests; and two rear footrests. The two seat leg tubes are located on the left and right sides of the seat. The middle of each seat leg tube is hinged to the upper end of the front support leg tube on the same side via a lateral hinge. The upper part of the seat leg tube is connected to the upper end of the front cross tube via seat post connectors. The middle sections of the two front cross tubes intersect and are hinged, and their lower ends are hinged to the lower end of the front support leg tube via the front footrests. The rear footrests are fitted onto the lower ends of the seat leg tubes. Anti-slip textures are provided on the ground surfaces of both the front and rear footrests to enhance the stability of the chair.

[0049] 3. The backrest adjustment mechanism includes: two armrests; two armrest support tubes; two T-shaped sliders; and two sliding sleeves. The armrests are hollow with an opening on their lower side and an internal groove running along their length, with multiple positioning positions. The upper horizontal axis of the T-shaped slider is housed within the groove of the armrest and can slide and position itself at different positions. The lower longitudinal axis of the T-shaped slider is sleeved with the upper end of the armrest support tube. The rear of the armrest is hinged to the middle of the upper support tube on the corresponding side of the backrest frame. The middle of the armrest support tube is hinged to the corresponding seat tube connector. The sliding sleeve is hinged to the lower end of the armrest support tube and sleeved on the front support leg tube, allowing it to slide along the front support leg tube. The backrest support angle of this invention can be adjusted via the armrests. The backrest adjustment limit design is embedded inside the armrests, improving safety and preventing pinching injuries during adjustment.

[0050] Example 2: Please refer to Figure 18 , Figure 19 A folding chair includes a backrest frame 1, a seat frame 2, a backrest adjustment mechanism 3, and a matching chair fabric. The backrest frame 1 includes two back tubes 11 and a folding assembly 12 between the two back tubes. The folding assembly 12 includes a vertically arranged central connecting tube 121, two upper support tubes 122, two lower support tubes 123, an upper hinge 124, and a lower hinge 125. The inner ends of the two upper support tubes 122 are connected to the upper end of the central connecting tube 121 through the upper hinge 124. The inner ends of the two lower support tubes 123 are connected to the lower end of the central connecting tube 121 through the lower hinge 125. The two upper support tubes 122, the two lower support tubes 123, and the central connecting tube 121 together form a stable "I"-shaped structure. The outer ends of the upper support tubes 122 are connected to the back tubes 11, and the outer ends of the lower support tubes 123 are hinged to the lateral hinges 23.

[0051] The difference between this embodiment and Embodiment 1 is that the outer end of the lower support tube 123 of the folding assembly 12 is no longer connected to the back tube 11, but instead is hinged to the lateral hinge member 23. This allows for a deeper connection between the backrest frame and the seat frame, and the lateral hinge member 23 on the seat frame distributes the force on the backrest frame, preventing excessive force concentration on the back tube 11. Specifically, the lower support tube 123 is hinged to the lateral hinge member 23 via a connector. The connector can be an L-shaped connector or other types of components. The hinge axis of the lower support tube 123 and the lateral hinge member 23 is the same as the hinge axis of the lateral hinge member 23 and the back tube 11.

[0052] The above description is merely an embodiment of the invention's technical content. Any modifications or variations made by those skilled in the art using this invention are within the scope of the invention's claims, and are not limited to those disclosed in the embodiments.

Claims

1. A folding chair, characterized in that... include: The chair back frame includes two back tubes and a folding assembly between the two back tubes; The seat frame and the backrest frame are hinged together. The backrest frame rotates around the hinge point. The seat frame includes two front support leg tubes and two seat leg tubes. The front support leg tubes and the seat leg tubes together form the seat surface support and the rear support leg of the seat. The backrest adjustment mechanism includes two armrests and two armrest support tubes. The armrest support tubes are slidably connected to the armrests. The rear part of the armrest is hinged to the middle part of the corresponding side backrest tube in the chair back frame. The middle part of the armrest support tube is hinged to the corresponding side seat leg tube. The bottom of the armrest support tube is connected to the corresponding side front support leg tube. The armrest slides and is limited relative to the armrest support tube. During the sliding stroke, the backrest frame rotates around the hinge point between the backrest frame and the seat frame to adjust the backrest angle.

2. A folding chair according to claim 1, characterized in that: The folding assembly includes a vertically arranged central connecting tube, two upper support tubes, two lower support tubes, an upper hinge, and a lower hinge. The inner ends of the two upper support tubes are hinged to the upper end of the central connecting tube through the upper hinge; the inner ends of the two lower support tubes are hinged to the lower end of the central connecting tube through the lower hinge. The two upper support tubes, the two lower support tubes, and the central connecting tube together form a stable "I"-shaped structure.

3. A folding chair according to claim 2, characterized in that: The outer ends of the upper and lower support tubes are connected to the back tube. The upper and lower support tubes have the same curvature, and the backrest presents an arc shape that bulges backward from the middle when unfolded.

4. A folding chair according to claim 2, characterized in that: The upper hinge is provided with a mounting groove for accommodating the end of the upper support tube, and a limiting part is formed on one side wall of the mounting groove to limit the rotation angle of the upper support tube; the lower hinge is provided with a mounting groove for accommodating the end of the lower support tube, and a limiting part is formed on one side wall of the mounting groove to limit the rotation angle of the lower support tube; the upper hinge and the lower hinge are provided with mounting holes for accommodating the central connecting tube on opposite sides.

5. A folding chair according to claim 1, characterized in that: The seat frame includes lateral hinges, and the backrest frame is hinged to the lateral hinges of the seat frame.

6. A folding chair according to claim 5, characterized in that: The lateral hinge has a mounting hole for the front outrigger tube and a mounting groove for accommodating the back tube. The back tube in the mounting groove is connected to the lateral hinge via a hinge shaft. One side of the mounting groove is open so that the back tube can rotate about the hinge shaft toward the open side.

7. A folding chair according to claim 6, characterized in that: The folding assembly includes a vertically arranged central connecting tube, two upper support tubes, two lower support tubes, an upper hinge, and a lower hinge. The inner ends of the two upper support tubes are hinged to the upper end of the central connecting tube via the upper hinge; the inner ends of the two lower support tubes are hinged to the lower end of the central connecting tube via the lower hinge. The two upper support tubes, the two lower support tubes, and the central connecting tube together form a stable "I"-shaped structure. The outer ends of the upper support tubes are connected to the back tube, and the outer ends of the lower support tubes are hinged to the lateral hinges.

8. A folding chair according to claim 1, characterized in that: The seat frame includes two front cross tubes that cross and hinge at the middle. The two leg tubes are located on the left and right sides of the seat. The middle of each leg tube is hinged to the upper end of the front support leg tube on the same side via a lateral hinge. The upper part of the leg tube is connected to the upper end of the front cross tube via a seat tube connector. The lower end of the front cross tube is hinged to the lower end of the front support leg tube via a front footrest. The lower end of the leg tube is fitted with a rear footrest. The leg tube is an integral arc-shaped tube with a seat tube section and a rear leg tube section.

9. A folding chair according to claim 1, characterized in that: The handrail has a hollow structure with an opening on the lower side and a sliding groove along its length inside, which has multiple positioning positions. The upper end of the handrail support tube is fitted with a T-shaped slider. The T-shaped slider has a protruding horizontal axis, which is housed in the sliding groove of the handrail and can slide along it and be positioned at different positions.

10. A folding chair according to claim 1, characterized in that: The lower end of the handrail support tube is hinged to the sliding sleeve, which is fitted onto the front support leg tube. When folded, the sliding sleeve slides along the front support leg tube.

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