Stand chair frame
By designing a pivotal support base and a folding rod assembly structure for the backrest, the problem of insufficient foldability of folding grandstand chairs was solved, realizing the miniaturization and convenient operation of the grandstand chair frame, and improving the ease of use and safety.
Patent Information
- Application Number
- CN202520799214.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-04-25
AI Technical Summary
Existing folding grandstand chairs suffer from insufficient foldability, large folded size, inconvenience in carrying, complex structure, and difficulty in unfolding and folding.
A grandstand chair frame was designed, including a support base and a backrest that are pivotally connected to each other. The chair frame can be unfolded and folded through the pivotal structure of the first folding rod group and the second folding rod group. The operation is simplified and the folded volume is reduced by using the cooperation of the U-shaped groove structure and the rotating parts.
The design achieves a simple structure, small folding size, easy portability, and convenient unfolding and folding operation, thus improving ease of use and safety.
Smart Images
Figure CN223913750U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of outdoor products technology, and in particular to a grandstand chair structure. Background Technology
[0002] With the vigorous development of social productivity, people's material enjoyment and spiritual pursuits have been greatly improved. As a result, there are more and more large-scale sports competitions, concerts, parties and other events held in indoor stadiums or outdoor stadiums. In these venues, the stands are generally tiered, and there are fixed seats on the stands for the audience to sit and watch the game.
[0003] The seating in tiered stands is designed with spectator comfort and safety in mind, typically using durable materials such as plastic or metal to withstand the weight of spectators and the pressure of prolonged use. However, this design results in seats that are relatively hard and bulky, sacrificing some comfort (the sitting and backrest areas are stiff), and the seats are prone to aging or damage over time, leading to a decline in safety performance.
[0004] Therefore, portable grandstand chairs have emerged. These chairs can be folded and carried for audiences to unfold and place on the stands. However, existing folding grandstand chairs have shortcomings such as insufficient foldability, large folded size, inconvenience in carrying, and a simple structure, making them difficult to operate when unfolding and folding. Utility Model Content
[0005] The purpose of this utility model is to provide a grandstand chair frame that is simple in structure, small in folding volume, and easy to operate.
[0006] To achieve the above objectives, this utility model provides a grandstand chair frame, including a support base and a backrest that are pivotally connected to each other;
[0007] The support base includes two parallel main rods and a first folding rod group pivotally connected between the two main rods. The first folding rod group includes two first folding rods whose inner ends are pivotally connected to each other, and the outer ends of the two first folding rods are respectively pivotally connected to the main rods on both sides.
[0008] The backrest includes two parallel back bars and a second folding bar assembly pivotally connected between the two back bars. The two back bars are pivotally connected to the rear ends of the two main bars respectively. The second folding bar assembly includes two second folding bars whose inner ends are pivotally connected to each other, and the outer ends of the two second folding bars are pivotally connected to the back bars on both sides respectively.
[0009] When the grandstand chair frame is unfolded, the two first folding rods and the two second folding rods are fixed at their maximum angles. When the grandstand chair frame is folded, the two first folding rods approach each other and the included angle between their inner ends decreases, and the distance between the main rods decreases accordingly. The two second folding rods approach each other and the included angle between their inner ends decreases, and the distance between the back rods decreases accordingly. The back rods rotate and fold towards the main rods.
[0010] Furthermore, the first folding rod assembly also includes a first pivot member, which is a U-shaped groove structure with an opening on one side, and the inner ends of the two first folding rods are pivotally connected in the U-shaped groove of the first pivot member.
[0011] Furthermore, the opening of the first pivot member faces the front of the grandstand chair frame. When the grandstand chair frame is folded, the first pivot member moves backward, and the inner ends of the two first folding rods rotate backward to fold.
[0012] Furthermore, the second folding rod assembly also includes a second pivot member, which is a U-shaped groove structure with an opening on one side, and the inner ends of the two second folding rods are pivotally connected in the U-shaped groove of the second pivot member.
[0013] Furthermore, the opening of the second pivot member faces downwards. When the grandstand chair frame is folded up, the second pivot member moves upwards, and the inner ends of the two second folding rods rotate upwards to fold up.
[0014] Furthermore, a rotating component is pivotally connected to the rear end of each of the two main rods. Each rotating component includes two relatively parallel L-shaped plates. The rear end of the main rod is sandwiched between the two L-shaped plates, and the lower ends of the two back rods are fixedly connected inside the rotating component.
[0015] Furthermore, the first folding rod is a trapezoidal rod whose width gradually decreases towards the inner end, and the upper and lower edges of the first folding rod have side walls protruding along the length direction, and the portion between the two side walls has multiple hollowed-out parts.
[0016] Furthermore, the inner surfaces of the two main rods are provided with first pivot seats at corresponding positions. The first pivot seat is a U-shaped groove structure with its opening facing the opposite main rod. The outer ends of the two first folding rods are respectively pivotally connected to the first pivot seats on the two main rods.
[0017] Furthermore, the inner sides of the two back bars are provided with second pivot seats at corresponding positions. The second pivot seats are U-shaped groove structures with openings facing the opposite back bars. The outer ends of the two second folding rods are respectively pivotally connected to the second pivot seats on the two back bars.
[0018] Furthermore, the upper half of the rear end face of the main pole is recessed with a relief groove, and the lower end of the back pole rotates in the relief groove; the part of the rear end face of the main pole located below the relief groove forms a step, and when the grandstand chair frame is unfolded, the lower end face of the back pole is supported on the step.
[0019] With the above solution, the present invention has a first folding rod group and a second folding rod group respectively between the two main rods and between the two back rods. When folded, the distance between the two main rods and the two back rods can be reduced by the angle change of the first folding rod group and the second folding rod group. In addition, the pivotal design between the back rod and the main rod allows the back rod to be further folded towards the main rod when folded. Thus, the present invention has a small folded volume, which is convenient for users to carry. At the same time, the above structure is relatively simple, and only simple force and folding operations are required by the user when unfolding and folding, which makes it convenient to use. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the unfolded state of an embodiment of the present invention (I).
[0021] Figure 2 This is a schematic diagram (II) of the unfolded state of an embodiment of the present invention.
[0022] Figure 3 This is a schematic diagram of a semi-folded state according to an embodiment of the present invention.
[0023] Figure 4 This is a schematic diagram of the folded state according to an embodiment of the present invention (I).
[0024] Figure 5 This is a schematic diagram (II) of the folded state according to an embodiment of the present invention.
[0025] Figure 6 This is a schematic diagram of the unfolded state of another embodiment of the present invention.
[0026] Explanation of icon numbers:
[0027] 1. Main rod; 11. First pivot seat; 12. Step; 13. Clearance groove;
[0028] 2 First folding rod; 21 First pivot member; 22 Side wall; 23 Hollowed-out part;
[0029] 3. Back bar; 31. Second pivot joint;
[0030] 4. Second folding rod; 41. Second pivot joint;
[0031] 5 rotating parts; 51 sheet body. Detailed Implementation
[0032] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.
[0033] See Figures 1 to 5This is an embodiment of a grandstand chair frame of the present invention, which includes a support base and a backrest that are pivotally connected to each other. The chair frame can be combined with chair cloth, chair cover and chair cushion placed on the outside to form a grandstand chair.
[0034] The support base includes two parallel main rods 1 and a first folding rod group 2 pivotally connected between the two main rods 1. The first folding rod group 2 includes a first pivot member 21 and two first folding rods 2 of the same length. The first pivot member 21 is a U-shaped groove structure with one side open. The inner ends of the two first folding rods 2 are pivotally connected in the U-shaped groove of the first pivot member 21 to achieve mutual pivot connection. The outer ends of the two first folding rods 2 are respectively pivotally connected to the main rods 1 on both sides.
[0035] The backrest includes two parallel back bars 3 and a second folding rod group 4 pivotally connected between the two back bars 3. The two back bars 3 are respectively pivotally connected to the rear ends of the two main bars 1. The second folding rod group 4 includes a second pivot member 41 and two second folding rods 4 of the same length. The second pivot member 41 is a U-shaped groove structure with an opening on one side. The inner ends of the two second folding rods 4 are pivotally connected in the U-shaped groove of the second pivot member 41 to achieve mutual pivot connection. The outer ends of the two second folding rods 4 are respectively pivotally connected to the back bars 3 on both sides.
[0036] When the grandstand chair frame is unfolded, the two first folding rods 2 and the two second folding rods 4 are fixed at their maximum angles. When the grandstand chair frame is folded, the two first folding rods 2 approach each other and the included angle between their inner ends decreases. The distance between the main rods 1 is also reduced as the frame folds. The two second folding rods 4 approach each other and the included angle between their inner ends decreases. The distance between the back rods 3 is also reduced as the frame folds. Then the back rods 3 can rotate and fold towards the main rods 1, thus achieving the overall folding of the chair frame.
[0037] The first pivot member 21 and the second pivot member 41 mentioned above have the same structure and size, and both are U-shaped groove structures. Therefore, they each have a bottom wall on the opposite side of the opening. When the grandstand chair frame is unfolded, the bottom wall can keep the two first folding rods 2 and the two second folding rods 4 at the maximum unfolding angle, thereby playing a positioning role and keeping the grandstand chair frame in the unfolded state.
[0038] For details, please refer to [link / reference]. Figure 1 and Figure 3 The opening of the first pivot 21 faces the front of the grandstand chair frame. When the grandstand chair frame is unfolded, the rear sides of the inner ends of the two first folding rods 2 push backward against the bottom wall of the first pivot 21 to play a positioning role, so that the two main rods 1 are kept at the maximum unfolded distance. When the grandstand chair frame is folded, the first pivot 21 moves backward, and the inner ends of the two first folding rods 2 rotate backward to fold, and the included angle becomes smaller. At this time, the two main rods 1 move together to fold and move closer to each other.
[0039] Similarly, with the opening of the second pivot 41 facing downwards, when the grandstand chair frame is unfolded, the upper sides of the inner ends of the two second folding rods 4 push upwards against the bottom wall of the second pivot 41, which plays a positioning role, keeping the two back rods 3 at the maximum unfolded distance. When the grandstand chair frame is folded, the second pivot 41 moves upwards, and the inner ends of the two second folding rods 4 rotate upwards to fold, and the included angle becomes smaller. At this time, the two back rods 3 move together to fold and move closer to each other.
[0040] The structure described above, with the first pivot member 21 and the second pivot member 41, is a preferred embodiment of this utility model. It is not only simple in structure but also convenient and direct in operation. In other embodiments, the pivoting and positioning functions of the first pivot member 21 and the second pivot member 41 can also be achieved through other unidirectional connections or other structures (such as inserting a positioning pin for locking after the two rods rotate to a suitable angle, or providing a corresponding elastic locking structure at the pivot joint of the inner ends of the two rods, etc.), which are quite common in the art and will not be elaborated further here.
[0041] For details, please refer to [link / reference]. Figure 2 , Figure 4 , Figure 5 Each of the two main rods 1 has a pivotal rotating component 5 at its rear end. Each rotating component 5 includes two relatively parallel L-shaped pieces 51. The rear end of the main rod 1 is sandwiched between the two L-shaped pieces 51. The lower ends of the two back rods 3 are fixedly connected inside the rotating component 5. Specifically, when the grandstand chair frame is unfolded, the pivotally connected main rod 1 and back rod 3 are respectively sandwiched on the two vertical sides of the L-shaped rotating component 5.
[0042] To further improve the smoothness of folding and unfolding and enhance the user experience, the upper half of the rear end face of the main pole 1 is recessed with a relief groove 13. The lower end of the back pole 3 is inserted into the relief groove 13 and pivotally connected to it. The part of the rear end face of the main pole 1 located below the relief groove 13 forms a step 12. When the grandstand chair frame is unfolded, the lower end face of the back pole 3 is supported on the step 12. The two pieces 51 of the rotating component 5 are clamped from the outside on the left and right sides of the main pole 1 and the back pole 3. The rotating component 5 can drive the back pole 3 to rotate in the relief groove 13.
[0043] On the inner surfaces of the two main rods 1 facing each other, a first pivot seat 11 is provided at corresponding positions. The first pivot seat 11 is a U-shaped groove structure with its opening facing the opposite main rod 1. The outer ends of the two first folding rods 2 are respectively pivotally connected to the first pivot seats 11 on the two main rods 1. Preferably, the first folding rod 2 is a trapezoidal rod whose width gradually decreases towards the inner end (the upper edge of the first folding rod 2 gradually slopes downward from the outer end to the inner end, and the lower edge of the first folding rod 2 is horizontal). The upper and lower edges of the first folding rod 2 have side walls 22 protruding along the length direction, and the portion between the two side walls 22 has multiple triangular hollow portions 23 (the hollow portions 23 can reduce the weight of the rod). In this way, the first folding rod 2 itself has better strength, and when the first folding rod 2 is connected to the first pivot seat 11 and the first pivot member 21, it presents a surface-to-surface connection (see Figure 1 The side of the first folding rod 2 is attached to and fixed to the inner surface of the first pivot seat 11 and the first pivot member 21. Since the support seat needs to support the weight of the human body, the above structure can have better stability and improve the safety of the grandstand chair frame.
[0044] Similarly, on the inner sides of the two backrests 3, corresponding positions are provided with second pivot seats 31. The second pivot seats 31 are U-shaped groove structures with openings facing the opposite backrest 3. The outer ends of the two second folding rods 4 are respectively pivotally connected to the second pivot seats 31 on the two backrests 3. Since the load-bearing capacity requirement of the backrest is relatively lower than that of the support seat, the second folding rods 4 can be hollow rods to reduce the overall weight of the grandstand chair frame.
[0045] Alternatively, the main rod 1 and the back rod 3 can also be hollow rods, with plugs at both ends to seal the inside of the rods.
[0046] See Figure 4 , Figure 5 After folding, the two first folding rods 2 are folded together to their minimum angle, and the two main rods 1 are brought closer together. The final folded distance between the two main rods 1 is approximately the same as the width of the first pivot joint 21, and the folded distance between the two back rods 3 is approximately the same as the width of the second pivot joint 41. Then, the back rods 3 are folded relative to the main rods 1 until they are flush against the upper surface of the main rods 1, resulting in a smaller folded volume and a more compact folded structure, making it easy to carry. Furthermore, due to the simple structure of the grandstand chair frame, the folding process is relatively simple and convenient, offering excellent ease of use.
[0047] See Figure 6 This is another embodiment of the present utility model, which is similar to the aforementioned Figures 1 to 5 The only difference in the described embodiment is that the opening of the second pivot 41 faces upward, and when the grandstand chair frame is unfolded, the lower sides of the inner ends of the two second folding rods 4 press downward against the bottom wall of the second pivot 41. Although the second pivot 41 cannot be like... Figure 1Similar to the embodiment in the previous one, the bottom wall provides a blocking and positioning function. However, the force on the backrest is not vertically downward. In addition, the outside of the grandstand chair frame is also equipped with chair cloth, chair cover, chair cushion, etc. with a certain tension or support capacity. Therefore, the positioning function provided by the second pivot 41 is not required to maintain the unfolded state, so that the two back rods 3 are kept at the maximum unfolded distance. When the grandstand chair frame is folded, the second pivot 41 moves downward, and the inner ends of the two second folding rods 4 rotate downward and fold, and the included angle becomes smaller. At this time, the two back rods 3 move together and fold closer to each other.
[0048] Similarly, in other embodiments, the first pivot member 21 can be configured to have an opening facing the rear side of the grandstand chair frame. When the grandstand chair frame is unfolded, the front sides of the inner ends of the two first folding rods 2 push forward against the bottom wall of the first pivot member 21 to play a positioning role, so that the two main rods 1 are kept at the maximum unfolded distance. When the grandstand chair frame is folded, the first pivot member 21 moves forward, and the inner ends of the two first folding rods 2 rotate forward and fold, and the included angle becomes smaller. At this time, the two main rods 1 move together to fold and move closer to each other.
[0049] The above is merely one embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A stand frame, characterized in that Includes the pivotally connected support base and the backrest; The support base includes two parallel main rods and a first folding rod group pivotally connected between the two main rods. The first folding rod group includes two first folding rods whose inner ends are pivotally connected to each other, and the outer ends of the two first folding rods are respectively pivotally connected to the main rods on both sides. The backrest includes two parallel back bars and a second folding bar assembly pivotally connected between the two back bars. The two back bars are pivotally connected to the rear ends of the two main bars respectively. The second folding bar assembly includes two second folding bars whose inner ends are pivotally connected to each other, and the outer ends of the two second folding bars are pivotally connected to the back bars on both sides respectively. When the grandstand chair frame is unfolded, the two first folding rods and the two second folding rods are fixed at their maximum angles. When the grandstand chair frame is folded, the two first folding rods approach each other and the included angle between their inner ends decreases, and the distance between the main rods decreases accordingly. The two second folding rods approach each other and the included angle between their inner ends decreases, and the distance between the back rods decreases accordingly. The back rods rotate and fold towards the main rods.
2. A stand of the type defined in claim 1, characterised in that The first folding rod assembly also includes a first pivot member, which is a U-shaped groove structure with an opening on one side, and the inner ends of the two first folding rods are pivotally connected in the U-shaped groove of the first pivot member.
3. A stand of seats according to claim 2, wherein The opening of the first pivot member faces the front of the grandstand chair frame. When the grandstand chair frame is folded, the first pivot member moves backward, and the inner ends of the two first folding rods rotate backward to fold.
4. A stand of seats according to claim 1, wherein The second folding rod assembly also includes a second pivot member, which is a U-shaped groove structure with an opening on one side. The inner ends of the two second folding rods are pivotally connected to the U-shaped groove of the second pivot member.
5. A stand of seats according to claim 4, wherein The opening of the second pivot joint faces downwards. When the grandstand chair frame is folded up, the second pivot joint moves upwards, and the inner ends of the two second folding rods rotate upwards to fold up.
6. A stand of seats according to claim 1, wherein Each of the two main rods has a rotating component pivotally connected to its rear end. Each rotating component includes two relatively parallel L-shaped plates. The rear end of the main rod is sandwiched between the two L-shaped plates, and the lower ends of the two back rods are fixedly connected inside the rotating component.
7. A stand of seats according to claim 1, wherein The first folding rod is a trapezoidal rod whose width gradually decreases towards the inner end, and the upper and lower edges of the first folding rod have side walls protruding along the length direction, and the part between the two side walls has multiple hollow parts.
8. A stand of seats according to claim 1 or 7, wherein On the inner sides of the two main rods facing each other, there are first pivot seats at corresponding positions. The first pivot seat is a U-shaped groove structure with the opening facing the opposite main rod. The outer ends of the two first folding rods are respectively pivotally connected to the first pivot seats on the two main rods.
9. A stand of seats according to claim 1, wherein On the inner sides of the two back poles facing each other, there are second pivot seats at corresponding positions. The second pivot seat is a U-shaped groove structure with the opening facing the opposite back pole. The outer ends of the two second folding poles are respectively pivotally connected to the second pivot seats on the two back poles.
10. A grandstand chair frame according to claim 6, characterized in that, The upper half of the rear end face of the main pole is recessed with a relief groove, and the lower end of the back pole rotates in the relief groove; the part of the rear end face of the main pole below the relief groove forms a step, and when the grandstand chair frame is unfolded, the lower end face of the back pole is supported on the step.