A stand chair and a backrest angle adjusting structure thereof

Abstract

The utility model discloses a stand chair and backrest angle adjusting structure thereof, including base and the chair back of rotation connection in base, be provided with the multiple stop adjusting assembly for adjusting the backrest angle between base and chair back, and multiple stop adjusting assembly includes sliding block, first elastic piece and rotatable rotating buckle, and first elastic piece is connected between sliding block and base, and rotating buckle is provided with at least 1 first limiting portion, and sliding block is provided with second limiting portion, and by rotating rotating buckle, to make first limiting portion switch between the position of far away and top and resist second limiting portion, and first limiting portion and second limiting portion abut, to make sliding block protrude to chair back and abut the abutment end of chair back, and then limit the rotation angle of chair back relative to base, and can adjust the backrest angle of stand chair like this, to improve the comfort and use experience of audience when watching the match.

Description

Technical Field

[0001] This utility model relates to the field of grandstand chair technology, and in particular to a grandstand chair and its backrest angle adjustment structure. Background Technology

[0002] Tiered stands are mostly located in indoor stadiums or outdoor stadiums for spectators to watch the game.

[0003] To increase comfort while sitting in the stands, many spectators bring their own chairs and place them on the stands. This allows them to sit comfortably without touching the hard, cold stands. However, most of these chairs have fixed backrest angles that cannot be adjusted to suit the user's needs, leading to fatigue for spectators during long viewing sessions. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a grandstand chair and its backrest angle adjustment structure, which can adjust the backrest angle of the grandstand chair through a multi-position adjustment component, thereby improving the comfort and user experience of spectators while watching the game.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: This utility model provides a backrest angle adjustment structure for a grandstand chair, including a base and a chair back rotatably connected to the base. A multi-position adjustment assembly for adjusting the backrest angle is provided between the base and the chair back. The multi-position adjustment assembly includes a sliding block, a first elastic element, and a rotatable rotating buckle. The first elastic element is connected between the sliding block and the base. The rotating buckle is provided with at least one first limiting part, and the sliding block is provided with a second limiting part. By rotating the rotating buckle, the first limiting part can be switched between a position away from and abutting the second limiting part. The first limiting part and the second limiting part abut against each other, so that the sliding block protrudes towards the chair back and abuts against the abutting end of the chair back, thereby limiting the rotation angle of the chair back relative to the base.

[0006] Furthermore, the rotating buckle is provided with an outwardly protruding limiting protrusion, and the end of the sliding block facing the rotating buckle is provided with a limiting step that cooperates with the limiting protrusion. The limiting protrusion is used to abut against the limiting step. The end of the sliding block away from the limiting step is used to abut against the abutting end of the chair back. The limiting protrusion is the first limiting part, and the limiting step is the second limiting part.

[0007] Furthermore, a first connector is fitted to one end of the base near the backrest, the sliding block is slidably fitted to the first connector, the rotating buckle is rotatably fitted to the first connector, and the first elastic element is fitted between the sliding block and the first connector.

[0008] Furthermore, the multi-position adjustment assembly also includes a guide shaft mounted on the first connector. The sliding block is provided with a guide groove penetrating its inner and outer surfaces. The guide shaft is spaced through the guide groove, and the sliding block can reciprocate relative to the guide shaft. The movement trajectory of the sliding block is limited by the guide groove and the guide shaft. When the limiting protrusion and the limiting step abut against each other, the end of the sliding block away from the limiting step protrudes out of the first connector and abuts against the abutting end of the chair back.

[0009] Furthermore, the first elastic element is a spring.

[0010] Furthermore, the multi-position adjustment assembly also includes a second elastic element, which is disposed between the rotary buckle and the first connecting member.

[0011] Furthermore, the second elastic element is a torsion spring.

[0012] Furthermore, a second connector is fitted to one end of the chair back near the base, and the first connector is rotatably connected to the second connector; the end of the second connector near the sliding block is the abutting end of the chair back.

[0013] Furthermore, the chair back is foldable; the base includes two main rods spaced apart from each other and a folding assembly disposed between the two main rods, the main rods being arranged in a crisscross or parallel manner; the folding assembly is used to coordinate the two main rods to move closer or further apart from each other, and to enable the base and the chair back to switch synchronously between folding and unfolding.

[0014] This utility model also provides a grandstand chair, which includes at least the aforementioned grandstand chair backrest angle adjustment structure.

[0015] The technical solution provided by this utility model has the following beneficial effects: By cooperating with the first limiting part of the rotating buckle and the second limiting part of the sliding block, the sliding block protrudes towards the backrest and abuts against the abutting end of the backrest, thereby limiting the rotation angle of the backrest relative to the base, thus forming one of the backrest angle adjustment positions. This ensures that the backrest can be freely adjusted to a suitable backrest angle, thereby improving the comfort and user experience of the audience when watching the game. Attached Figure Description

[0016] Figure 1 The diagram shown is a structural schematic of the grandstand chair in the first gear position in the embodiment. Figure 2 The figure shown is a cross-sectional view of the grandstand chairs in the first gear position in the embodiment; Figure 3 The diagram shown is a schematic of a rotary buckle equipped with a second elastic element in an embodiment. Figure 4 The diagram shown is a structural schematic of the grandstand chair in the second gear position in the embodiment. Figure 5 The image shown is a schematic diagram of the grandstand chairs when folded up in the embodiment. Figure 6 As shown Figure 2 Enlarged diagram of area A in the middle. Detailed Implementation

[0017] 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.

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0019] Reference Figures 1 to 6 This embodiment provides a grandstand chair, including armrests 4 and a backrest angle adjustment structure (hereinafter referred to as adjustment structure 100). Of course, in other embodiments, the armrests 4 may be omitted.

[0020] like Figure 1 As shown, the adjustment structure 100 of this embodiment includes a base 1, a chair back 2 rotatably connected to the base 1, and a multi-position adjustment component 3 disposed between the base 1 and the chair back 2. The armrest 4 is rotatably connected to the base 1 and the chair back 2, and the multi-position adjustment component 3 is used to adjust the backrest angle of the grandstand chair.

[0021] like Figure 2 and Figure 6 As shown, the multi-position adjustment assembly 3 includes a sliding block 31, a first elastic element 32, a second elastic element 34, and a rotatable rotating buckle 33. The rotating buckle 33 is provided with a first limiting part 331, and the sliding block 31 is provided with a second limiting part 311. By rotating the rotating buckle 33, the first limiting part 331 can be switched between a position away from and abutting the second limiting part 311.

[0022] When the grandstand chairs are unfolded, the first limiting part 331 and the second limiting part 311 abut against each other, causing the sliding block 31 to protrude toward the backrest 2 and abut against the abutment end 221 of the backrest 2, thereby limiting the rotation angle of the backrest 2 relative to the base 1, that is, restricting the backrest 2 to a certain position. Figure 1 In the first gear position shown.

[0023] In this embodiment, as Figure 1 As shown, the base 1 is foldable. Specifically, the base 1 includes two main rods 11 spaced apart on the left and right and a folding assembly 13 disposed between the two main rods 11. The folding assembly 13 is used to move the two main rods 11 closer to or further apart from each other, and to enable the base 1 and the chair back 2 to switch synchronously between folding and unfolding.

[0024] The chair back 2 is foldable. Specifically, the chair back 2 includes vertical rods 21 that are rotatably connected to the two main rods 11, horizontal rod assemblies 23 that are connected to the two vertical rods 21, and connecting rods 24 that are connected between the two horizontal rod assemblies 23. At this time, the connecting rods 24 and the two horizontal rod assemblies 23 form an I-shaped foldable backrest structure, which can improve the structural stability and support strength of the chair back 2, and also further enhance the comfort of the grandstand chair.

[0025] By folding the base 1 and the backrest 2, a shape is formed as follows: Figure 5 The image shows the folded-down state of the grandstand chairs. Of course, the two main poles 11 of the base 1 can be arranged in parallel or intersecting positions, meaning the overall shape of the base 1 can be rectangular or trapezoidal.

[0026] More specifically, the two main rods 11 are respectively equipped with a first connector 12 near the rear end of the chair back 2, the sliding block 31 is slidably assembled to the first connector 12, the rotating buckle 33 is rotatably assembled to the first connector 12, and the first elastic member 32 is assembled between the sliding block 31 and the first connector 12.

[0027] like Figure 2 Figure 6 As shown, the two vertical rods 21 are respectively equipped with second connecting parts 22 near the lower end of the base 1. The two first connecting parts 12 are rotatably connected to the corresponding second connecting parts 22. At this time, the end of the second connecting part 22 near the sliding block 31 is the abutting end 221 of the chair back 2.

[0028] like Figure 2 , Figure 3 and Figure 6As shown, the rotating buckle 33 is provided with a limiting protrusion 331' extending outward, and the sliding block 31 is provided with a limiting step 311' that cooperates with the limiting protrusion 331' at the lower end of the rotating buckle 33. The limiting protrusion 331' is used to abut against the limiting step 311'. At this time, the limiting protrusion 331' is the first limiting part 331, and the limiting step 311' is the second limiting part 311.

[0029] When the limiting protrusion 331' and the limiting step 311' abut against each other, the upper end of the sliding block 31 protrudes from the first connector 12 away from the limiting step 311' and abuts against the second connector 22.

[0030] In this specific embodiment, such as Figure 2 and Figure 6 As shown, the multi-position adjustment assembly 3 also includes guide shafts 35 respectively mounted on the two first connecting members 12. Guide grooves 312 penetrating the inner and outer surfaces of the two sliding blocks 31 are respectively provided therein. The two guide shafts 35 are spaced apart and pass through the corresponding guide grooves 312. The sliding blocks 31 can move back and forth relative to the guide shafts 35. The movement trajectory of the sliding blocks 31 is limited by the guide grooves 312 and the guide shafts 35 to ensure reliability. Of course, in other embodiments, a guide rail structure can be used instead of the guide shafts 35 and guide grooves 312.

[0031] Specifically, the first elastic element 32 is a spring, which is connected between the sliding block 31 and the first connecting member 12. The second elastic element 34 is a torsion spring, which is disposed between the rotating buckle 33 and the first connecting member 12. Of course, in other embodiments, the first elastic element 32 can also be a spring sheet structure, and the second elastic element 34 can be a tension spring or other elastic element.

[0032] like Figure 1 As shown, when the grandstand chair changes from the folded state to the open state for the first time, the sliding block 31 automatically rebounds upward to the highest position under the elastic force of the first elastic element 32, and the limiting protrusion 331' of the rotating buckle 33 rotates towards the sliding block 31 under the elastic force of the second elastic element 34 until the limiting protrusion 331' of the rotating buckle 33 engages with the limiting step 311' of the sliding block 31. Then, the backrest 2 rotates backward relative to the base 1 until the second connecting piece 22 on the vertical rod 21 presses down on the upper end of the sliding block 31, and then the sliding block 31 is pressed down until the lower end of the sliding block 31 abuts against the limiting protrusion 331' of the rotating buckle 33, so that the sliding block 31 is at the support height of the first position of the grandstand chair, that is, the backrest angle of the grandstand chair can be kept vertical.

[0033] like Figure 4As shown, when a spectator sits on the grandstand chair, by manually rotating the two rotating buckles 33 in the opposite direction, the limiting protrusion 331' of the rotating buckle 33 slides out of the corresponding limiting step 311'. At this time, the sliding block 31 is no longer supported by the limiting protrusion 331'. At the same time, the body applies force backward to the chair back 2, and continues to press down the sliding block 31 while overcoming the upward elastic force limitation of the first elastic member 32. This causes the sliding block 31 to continue to move downward along the guide direction of the guide shaft 35 and the guide groove 312. Therefore, the chair back 2, along with each of the second connecting members 22, can continue to rotate backward until the upper groove wall of the guide groove 312 of the sliding block 31 is abutted by the guide shaft 35 and stops moving downward. This further increases the backrest angle of the grandstand chair and corresponds to the second position of the grandstand chair. Of course, the distance between the upper and lower groove walls in the guide groove 312 is used to limit the lifting height of the sliding block 31.

[0034] If from such Figure 4 The second gear shown returns to the position as follows Figure 1 When in the first position, simply pull or rotate the backrest 2 forward to move the second connector 22 away from the sliding block 31. Under the elastic force of the first elastic member 32, the sliding block 31 will automatically spring back to the highest position. The limiting protrusion 331' of the rotating buckle 33 will also re-engage with the limiting step 311' of the sliding block 31 under the reset elastic force of the second elastic member 34, thus resetting the rotating buckle 33 to the initial angle of contact with the sliding block 31.

[0035] By cooperating with the first limiting part 331 of the rotating buckle 33 and the second limiting part 311 of the sliding block 31, the sliding block 31 protrudes towards the backrest 2 and abuts against the abutting end 221 of the backrest 2, thereby limiting the rotation angle of the backrest 2 relative to the base 1, thus forming one of the adjustment positions of the backrest angle. This ensures that the backrest 2 can be freely adjusted to a suitable backrest angle, thereby improving the comfort and user experience of the audience when watching the game.

[0036] Of course, in other embodiments, multiple first limiting parts 331 can be provided, corresponding to the same second limiting part 311, and the protrusion height of different first limiting parts 331 is different, so that the sliding block 31 is pushed up to the same height, thus realizing multiple backrest angle adjustments; in addition, the installation positions of the limiting protrusion 331' and the limiting step 311' can also be interchanged.

[0037] 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 angle adjustment structure for a grandstand chair, comprising a base and a chair back rotatably connected to the base, characterized in that: A multi-position adjustment component for adjusting the backrest angle is provided between the base and the chair back. The multi-position adjustment assembly includes a sliding block, a first elastic element, and a rotatable rotating buckle. The first elastic element is connected between the sliding block and the base. The rotating buckle is provided with at least one first limiting part, and the sliding block is provided with a second limiting part. By rotating the rotating buckle, the first limiting part can be switched between a position away from and abutting the second limiting part. The first limiting part and the second limiting part abut against each other, so that the sliding block protrudes towards the chair back and abuts against the abutting end of the chair back, thereby limiting the rotation angle of the chair back relative to the base.

2. The backrest angle adjustment structure of the grandstand chair according to claim 1, characterized in that: The rotating buckle is provided with an outwardly protruding limiting protrusion. The end of the sliding block facing the rotating buckle is provided with a limiting step that cooperates with the limiting protrusion. The limiting protrusion is used to abut against the limiting step. The end of the sliding block away from the limiting step is used to abut against the abutting end of the chair back. The limiting protrusion is the first limiting part, and the limiting step is the second limiting part.

3. The backrest angle adjustment structure of the grandstand chair according to claim 2, characterized in that: The base is fitted with a first connector at one end near the backrest, the sliding block is slidably fitted to the first connector, the rotating buckle is rotatably fitted to the first connector, and the first elastic element is fitted between the sliding block and the first connector.

4. The backrest angle adjustment structure of the grandstand chair according to claim 3, characterized in that: The multi-position adjustment assembly further includes a guide shaft mounted on the first connector. The sliding block is provided with a guide groove penetrating its inner and outer surfaces. The guide shaft is spaced through the guide groove, and the sliding block can reciprocate relative to the guide shaft. The movement trajectory of the sliding block is limited by the guide groove and the guide shaft. When the limiting protrusion and the limiting step abut against each other, the end of the sliding block away from the limiting step protrudes from the first connector and abuts against the abutting end of the chair back.

5. The backrest angle adjustment structure of the grandstand chair according to claim 3, characterized in that: The first elastic element is a spring.

6. The backrest angle adjustment structure of the grandstand chair according to claim 3, characterized in that: The multi-position adjustment assembly further includes a second elastic element, which is disposed between the rotary buckle and the first connecting member.

7. The backrest angle adjustment structure of the grandstand chair according to claim 6, characterized in that: The second elastic element is a torsion spring.

8. The backrest angle adjustment structure of the grandstand chair according to any one of claims 3-7, characterized in that: The backrest is fitted with a second connector at one end near the base, and the first connector is rotatably connected to the second connector; the end of the second connector near the sliding block is the abutting end of the backrest.

9. The backrest angle adjustment structure of the grandstand chair according to any one of claims 1-7, characterized in that: The chair back is foldable; the base includes two main rods spaced apart from each other and a folding assembly disposed between the two main rods, the main rods being arranged in a crisscross or parallel manner; the folding assembly is used to move the two main rods closer to or further apart from each other, and to allow the base and the chair back to switch synchronously between folding and unfolding.

10. A grandstand chair, characterized in that: It includes at least the backrest angle adjustment structure of the grandstand chair as described in any one of claims 1-9.

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