A seat back reclining adjustment structure

Abstract

The utility model discloses a kind of turnover adjustment structures of seat backrest, it includes shaft, is arranged on seat frame;Adapter plate, one end is fixed on the back frame, the other end is rotatably sleeved on shaft;Fixed tooth plate, is fixed on seat frame, and one end is equipped with half gear;Rotary tooth plate, rotatably installed on adapter plate, and one end is equipped with rack;Wrench, rotatably installed on shaft, and it is arranged in the side of adapter plate, wrench is used to cooperate and drive rotary tooth plate rotation, the utility model user only needs to move forward wrench, can release the engagement locking of rack to half gear, at this time, backrest angle can be freely adjusted, after releasing wrench, wrench is reset by torsional spring, rack and half gear are re-engaged locking, angle adjustment of backrest can be completed, adjustment is convenient, backrest support height can be adjusted in the range of 37 centimeters~45 centimeters, break through the structure limit of traditional seat, backrest can be flexibly turned over and adjusted in a wide range, like high-end aviation seat, and it is strong in practicality.

Description

Technical Field

[0001] This utility model relates to the field of folding chair technology, and in particular to a flip-adjustable structure for a seat back. Background Technology

[0002] With the development of technology and the progress of humanities, chairs have gradually become one of the most frequently used seating pieces. In recent years, with industrial development, people's demands for material culture have generally increased, leading to higher expectations and a greater appreciation for chairs.

[0003] To better meet health and comfort needs, many chairs on the market, especially ergonomic chairs, typically feature adjustable backrest angles. These chairs have an angle adjustment mechanism between the backrest and seat cushion. The most common adjustment mechanism is a manual bolt, while some high-end chairs incorporate stepless adjustment hinges and lever locking devices for more flexible and responsive backrest angle adjustments. However, the production cost of these chairs is high, making large-scale market promotion difficult. Traditional mid-to-low-end chairs, due to cost constraints, struggle to offer a good backrest adjustment experience, and backrest angle adjustment is cumbersome, lacking the ability to perform wide-range, multi-angle adjustments. Utility Model Content

[0004] To solve the above problems, this utility model proposes a flip-up adjustment structure for a seat back.

[0005] The technical solution adopted by this utility model is: a flip-up adjustment structure for a seat back, wherein the seat cushion is provided with a seat frame and the backrest is provided with a backrest frame, and the flip-up adjustment structure includes:

[0006] The shaft is mounted on the bracket;

[0007] The adapter plate is fixed at one end to the back frame and rotatably sleeved on the shaft at the other end.

[0008] A fixed toothed plate is fixed on the base frame, and a half gear is provided at one end;

[0009] Rotate the toothed plate, which is rotatably mounted on the adapter plate, and one end of the toothed plate is provided with a rack;

[0010] A wrench is rotatably mounted on the shaft and arranged on one side of the adapter plate. The wrench is used to drive the rotating toothed plate to rotate.

[0011] The flipping adjustment structure has a positioning state and a flipping state. In the positioning state, the rack meshes with the half gear; in the flipping state, the rack disengages from the half gear, and the adapter plate rotates freely around the shaft.

[0012] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0013] Preferably, a guide block is fixed on one side of the rotating toothed plate, a first guide groove is provided on the adapter plate, and a second guide groove is provided on the wrench. The guide block passes through the first guide groove and the second guide groove in sequence. An anti-disengagement ring is provided on the guide block, and the anti-disengagement ring abuts against the wrench. During the process of switching from the positioning state to the flipping state, the guide block moves from the front end to the rear end of the first guide groove and from the upper end to the lower end of the second guide groove.

[0014] Preferably, the first guide groove extends horizontally in the front-to-back direction, and the second guide groove extends obliquely in the up-down direction.

[0015] Preferably, the end of the shaft is provided with a torsion spring, and one end of the torsion spring is connected to the wrench.

[0016] Preferably, the adapter plate is provided with a limiting block, one end of the torsion spring is connected to the limiting block, and the lower end of the wrench is provided with a notch. In the positioning state, the limiting block is placed in the notch, and in the flipping state, the notch moves upward away from the limiting block.

[0017] Preferably, the wrench has a wrench handle at its upper position, and a grip sleeve is fitted onto the upper end of the wrench handle.

[0018] Preferably, an outer cover is fixed to one side of the adapter plate, one end of the shaft abuts against the outer cover, and a receiving space is formed between the outer cover and the adapter plate for placing the torsion spring and the lower part of the wrench.

[0019] Preferably, the seat frame includes at least two long rods arranged opposite each other on the left and right, the shaft extends in the left and right direction and is arranged between the two long rods, the back frame includes at least two uprights arranged opposite each other on the left and right, and the adapter plate is disposed between the rear end of the long rod and the lower end of the upright.

[0020] More preferably, two adapter plates are provided at both ends of the shaft, and the rotating tooth plate is rotatably mounted on one of the adapter plates located on the outer side.

[0021] Compared with the prior art, this utility model has the following beneficial effects:

[0022] Users simply need to pull the wrench forward. The guide block on the rotating gear plate, the first guide groove on the adapter plate, and the second guide groove on the wrench engage with each other, allowing the rotating gear plate to rotate relative to the adapter plate. This releases the locking of the rack on the rotating gear plate to the half gear on the fixed gear plate. At this point, the backrest can be freely adjusted to a suitable angle. After releasing the wrench, the wrench automatically resets via the torsion spring, and the rack and half gear re-engage and lock, thus completing the backrest angle adjustment. The adjustment is convenient, and the backrest support height can be adjusted within the range of 37 cm to 45 cm. Breaking through the structural limitations of traditional seats, the backrest can be flexibly flipped and adjusted over a wide range, much like a high-end aviation seat, making it highly practical. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a left-side view of the assembly structure of the seat and back frame, showing the flip adjustment structure in a positioned state according to one embodiment of this application.

[0025] Figure 2 for Figure 1 Enlarged view of part A in the image;

[0026] Figure 3 This is a right-side view of the assembly structure of the seat and back frame, showing the tilt adjustment structure in a positioned state according to one embodiment of this application.

[0027] Figure 4 for Figure 3 Enlarged view of part B in the image;

[0028] Figure 5 This is a left-side view of the assembly structure of the seat and back frame, showing the flip adjustment structure in a flipped state according to one embodiment of this application.

[0029] Figure 6 for Figure 5 Enlarged view of part C in the image;

[0030] Figure 7 This is a right-side view of the assembly structure of the seat and back frame, showing the flip adjustment structure in a flipped state according to one embodiment of this application.

[0031] Figure 8 for Figure 7 Enlarged view of part D in the image;

[0032] Figure 9 This is an overall assembly diagram of the base frame and back frame after the outer casing is installed in one embodiment of this application;

[0033] Figure 10 This is a left-side view of the overall structure of the flip adjustment structure in a positioning state according to an embodiment of this application;

[0034] Figure 11 This is a right-side view of the overall structure of the flip adjustment structure in a positioning state according to an embodiment of this application.

[0035] Figure 12 This is an overall structural diagram of the flip adjustment structure in one embodiment of this application, after the wrench is hidden in the positioning state.

[0036] The components in the attached diagram are labeled as follows: 1-Seat frame, 2-Back frame, 3-Shaft, 4-Adapter plate, 41-Limit block, 42-First guide groove, 5-Fixed gear plate, 51-Half gear, 6-Rotating gear plate, 61-Rotating shaft, 62-Guide block, 621-Anti-detachment ring, 63-Rack, 7-Wrench, 71-Second guide groove, 72-Notch, 73-Grip sleeve, 8-Torsion spring, 9-Outer casing.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0040] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0041] Detailed implementation plan: See below Figures 1-12 This utility model relates to a flip-up adjustment structure for a seat back. The seat cushion contains a seat frame 1, and the backrest contains a backrest frame 2. The flip-up adjustment structure includes:

[0042] Shaft 3 is mounted on bracket 1;

[0043] The adapter plate 4 is fixed at one end to the back frame 2 and rotatably sleeved on the shaft 3 at the other end;

[0044] The fixed tooth plate 5 is fixed on the base 1, and one end is provided with a half gear 51;

[0045] Rotate the toothed plate 6, which is rotatably mounted on the adapter plate 4, and one end is provided with a toothed rack 63;

[0046] The wrench 7 is rotatably mounted on the shaft 3 and arranged on one side of the adapter plate 4. The wrench 7 is used to drive the rotating gear plate 6 to rotate.

[0047] The flip adjustment structure has a positioning state and a flipping state. In the positioning state, the rack 63 is engaged with the half gear 51; in the flipping state, the rack 63 disengages from the half gear 51, and the adapter plate 4 rotates freely around the shaft 3.

[0048] In a preferred embodiment of this invention, a guide block 62 is fixed on one side of the rotating toothed plate 6, a first guide groove 42 is provided on the adapter plate 4, and a second guide groove 71 is provided on the wrench 7. The guide block 62 passes through the first guide groove 42 and the second guide groove 71 in sequence. An anti-detachment ring 621 is provided on the guide block 62, and the anti-detachment ring 621 abuts against the wrench 7. During the process of switching from the self-positioning state to the flipping state, the guide block 62 moves from the front end to the rear end of the first guide groove 42 and from the upper end to the lower end of the second guide groove 71.

[0049] Here, the anti-detachment ring 621 is provided to prevent the guide block 62 from detaching from the first guide groove 42 and the second guide groove 71.

[0050] Furthermore, in this embodiment, the first guide groove 42 extends horizontally in the front-back direction, and the second guide groove 71 extends obliquely in the up-down direction.

[0051] Then, please check Figure 12 As can be seen, a torsion spring 8 is fitted at the end of the shaft 3, and one end of the torsion spring 8 is connected to the wrench 7.

[0052] Next, please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 In this embodiment, the adapter plate 4 is provided with a limiting block 41, the other end of the torsion spring 8 is connected to the limiting block 41, and the lower end of the wrench 7 is provided with a notch 72. In the positioning state, the limiting block 41 is placed in the notch 72, and in the flipping state, the notch 72 moves upward away from the limiting block 41.

[0053] In this embodiment, by setting a torsion spring 8 on the shaft 3, and connecting one end of the torsion spring 8 to the limiting block 41 and the other end to the wrench 7, the wrench 7 can be reset backward after being turned forward (see the principle below for details).

[0054] The working principle of the flip adjustment structure switching from the self-positioning state to the flip state is explained below:

[0055] Please see Figures 1-4 As can be seen, in the positioning state, the guide block 62 is located at the front end of the first guide groove 42 and the upper end of the second guide groove 71, and the rack 63 on the rotating tooth plate 6 and the half gear 51 on the fixed tooth plate 5 are engaged. At this time, the adapter plate 4 cannot rotate around the shaft 3, thereby fixing the relative position of the back frame 2 and the seat frame 1.

[0056] Please see Figures 5-8 When it is necessary to adjust the rotation angle of the back frame 2, the flip adjustment structure needs to be switched to the flip state. At this time, the user needs to grasp the upper end of the wrench 7 and push the wrench 7 forward. The wrench 7 will then rotate clockwise around the shaft 3. Since a guide block 62 is fixed on one side of the rotating toothed plate 6, the guide block 62 will move downward along the second guide groove 71. Furthermore, since the second guide groove 71 is arranged at an angle, during this process, the front inner wall of the second guide groove 71 will squeeze the guide block 62 and drive the guide block 62 to move from the front end to the rear end of the first guide groove 42. This allows the rotating toothed plate 6 to flip backward, and the rack 63 on the rotating toothed plate 6 will disengage from the half gear 51 on the fixed toothed plate 5. At this time, the adapter plate 4 can rotate around the shaft 3, and the user can freely adjust the rotation angle of the back frame 2.

[0057] After the back frame 2 is adjusted to the appropriate angle, the wrench 7 is released, and the torsion spring 8 can drive the wrench 7 to reset. Similarly, the rack 63 re-engages with the half gear 51 to complete the locking of the angle.

[0058] In this embodiment, the backrest support height can be adjusted within the range of 37 cm to 45 cm, breaking through the structural limitations of traditional seats. The backrest can be flexibly flipped and adjusted in a wide range, just like a high-end aviation seat.

[0059] Note that the notch 72 and the limiting block 41 mentioned above can facilitate the installation of the torsion spring 8, and can better position the wrench 7 in the positioning state. With the torque provided by the torsion spring 8, the rack 63 can be more stably engaged with the half gear 51.

[0060] Next, to improve the grip feel of wrench 7, please refer to... Figure 10 As can be seen, in this embodiment, the upper part of the wrench 7 is provided with a wrench 7 rod, and the upper end of the wrench 7 rod is fitted with a grip sleeve 73.

[0061] Please see Figure 9 In order to better protect the internal structure and improve the aesthetics, in this embodiment, an outer cover 9 is fixed on one side of the adapter plate 4, and one end of the shaft 3 abuts against the outer cover 9. A receiving space is formed between the outer cover 9 and the adapter plate 4 for placing the lower part of the torsion spring 8 and the wrench 7.

[0062] Then, please see Figure 3 and Figure 4 As can be seen, in this embodiment, the seat frame 1 includes at least two long rods arranged opposite each other on the left and right, the shaft 3 extends in the left and right direction and is arranged between the two long rods, the back frame 2 includes at least two uprights arranged opposite each other on the left and right, and the adapter plate 4 is arranged between the rear end of the long rod and the lower end of the upright.

[0063] More specifically, two adapter plates 4 are provided at both ends of the shaft 3, and the rotating toothed plate 6 is rotatably mounted on one of the adapter plates 4 located on the outer side.

[0064] The above description of the seat back flip adjustment structure of this utility model is only a preferred embodiment of this utility model and does not limit the patent scope of this utility model. All equivalent structural transformations made under the inventive concept of this utility model using the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this utility model.

Claims

1. A flip-up adjustment structure for a seat back, wherein the seat cushion has a seat frame and the backrest has a backrest frame, characterized in that, The flip adjustment structure includes: The shaft is mounted on the bracket; The adapter plate is fixed at one end to the back frame and rotatably sleeved on the shaft at the other end. A fixed toothed plate is fixed on the base frame, and a half gear is provided at one end; Rotate the toothed plate, which is rotatably mounted on the adapter plate, and one end of the toothed plate is provided with a rack; A wrench is rotatably mounted on the shaft and arranged on one side of the adapter plate. The wrench is used to drive the rotating toothed plate to rotate. The flipping adjustment structure has a positioning state and a flipping state. In the positioning state, the rack meshes with the half gear; in the flipping state, the rack disengages from the half gear, and the adapter plate rotates freely around the shaft. A guide block is fixed on one side of the rotating toothed plate. A first guide groove is provided on the adapter plate, and a second guide groove is provided on the wrench. The guide block passes through the first guide groove and the second guide groove in sequence. An anti-disengagement ring is provided on the guide block, and the anti-disengagement ring abuts against the wrench. During the process of switching from the positioning state to the flipping state, the guide block moves from the front end of the first guide groove to the rear end, and from the upper end of the second guide groove to the lower end. The first guide groove extends horizontally in the front-to-back direction, and the second guide groove extends obliquely in the up-down direction; The end of the shaft is provided with a torsion spring, and one end of the torsion spring is connected to the wrench.

2. The seat backrest tilting and adjusting structure according to claim 1, characterized in that, The adapter plate is provided with a limiting block, one end of the torsion spring is connected to the limiting block, and the lower end of the wrench is provided with a notch. In the positioning state, the limiting block is placed in the notch, and in the flipping state, the notch moves upward away from the limiting block.

3. The seat backrest tilting and adjusting structure according to claim 2, characterized in that, The wrench has a wrench handle at its upper position, and a grip sleeve is fitted onto the upper end of the wrench handle.

4. The seat backrest tilting and adjusting structure according to claim 3, characterized in that, An outer cover is fixed to one side of the adapter plate, and one end of the shaft abuts against the outer cover. A receiving space is formed between the outer cover and the adapter plate for placing the torsion spring and the lower part of the wrench.

5. A seat backrest tilting and adjusting structure according to any one of claims 1-4, characterized in that, The seat frame includes at least two long rods arranged opposite each other on the left and right sides. The shaft extends in the left and right direction and is arranged between the two long rods. The back frame includes at least two uprights arranged opposite each other on the left and right sides. The adapter plate is disposed between the rear end of the long rod and the lower end of the upright.

6. The seat backrest tilting and adjusting structure according to claim 5, characterized in that, Two adapter plates are provided at both ends of the shaft, and the rotating tooth plate is rotatably mounted on one of the adapter plates located on the outer side.

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