Back cushion angle adjusting structure and furniture thereof

Abstract

The utility model discloses a back cushion angle adjusting structure and furniture thereof, the back cushion angle adjusting structure comprises a first connecting piece, a second connecting piece and an angle adjusting hinge, the first connecting piece is arranged on a backrest, the second connecting piece is arranged on a back cushion, and the angle adjusting hinge is respectively hinged with the first connecting piece and the second connecting piece. The angle adjusting hinge is provided with an initial position and a limit position, when the angle adjusting hinge is switched from the initial position to the limit position, the angle adjusting hinge is switched from an angle adjusting state to a free rotating state, and when the angle adjusting hinge is switched from the limit position to the initial position, the angle adjusting hinge is switched from the free rotating state to the angle adjusting state. The personalized requirements of users with different heights on backrest angle adjustment are met through cyclic operation, the backrest and the back cushion are adjusted to be at a proper angle, the waist vacancy phenomenon that the back cushion is not attached to the waist position when the user is in the leaning posture is avoided, and the comfort requirement of the user is met.

Description

Technical Field

[0001] This utility model relates to the field of furniture manufacturing technology, and in particular to a cushion angle adjustment structure and the furniture thereof. Background Technology

[0002] Sofas and soft beds are common home furnishing products. The backrests and lumbar support of traditional sofas and soft beds are at a fixed angle within a certain range. Due to the different heights of each person, when using the reclining posture, the backrest may not fit the lower back properly, resulting in a feeling of emptiness in the lower back and affecting the consumer's experience of product comfort. Utility Model Content

[0003] The purpose of this invention is to provide a cushion angle adjustment structure and related furniture, aiming to solve the technical problem that the lumbar support part of existing furniture has a fixed angle.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a cushion angle adjustment structure applied to furniture, the furniture including a backrest and a cushion, the cushion angle adjustment structure including a first connector, a second connector, and an angle adjustment hinge, the first connector being disposed on the backrest, the second connector being disposed on the cushion, one end of the first connector being hinged to one end of the second connector, the angle adjustment hinge having an initial position and a limit position, the angle adjustment hinge switching from an angle adjustment state to a free rotation state when switching from the initial position to the limit position, and the angle adjustment hinge switching from a free rotation state to an angle adjustment state when switching from the limit position to the initial position.

[0005] In some embodiments, the angle-adjusting hinge includes a first connecting portion and a second connecting portion capable of rotational adjustment by a first preset increment. The first connecting portion is hinged to the first connecting member, and the second connecting portion is hinged to the second connecting member, so that the first connecting member and the second connecting member are rotated and adjusted by a second preset increment.

[0006] In some embodiments, the second preset incremental angle is 5°; and / or, the cushion angle adjustment structure further includes a third connector, there are two first connectors, the two first connectors are located on both sides of the second connector, one end of the third connector is hinged to the first connector, and the other end of the third connector is clamped between the two first connectors and connected to the two first connectors.

[0007] In some embodiments, the angle-adjusting hinge further includes a spring and a first elastic element. The first connecting portion is configured with a first arc-shaped groove, and the radial outer side wall of the first arc-shaped groove is configured with a first arc-shaped rack. The second connecting portion is configured with a second arc-shaped groove. The spring is inserted into the first arc-shaped groove and the second arc-shaped groove, and a second arc-shaped rack adapted to the first arc-shaped rack is configured on the side facing the first arc-shaped rack. The first elastic element is clamped between the radial inner side wall of the first arc-shaped groove and the side of the spring away from the second arc-shaped rack.

[0008] In some embodiments, the end of the spring away from the back plate is provided with a first engaging portion, the end of the first arc-shaped groove facing the first engaging portion is provided with a first mating groove, and the end of the second arc-shaped groove away from the first engaging portion is provided with a second mating groove. When the first engaging portion is inserted into the first mating groove, the first arc-shaped rack and the second arc-shaped rack can be separated, and the end of the spring away from the first engaging portion is locked at the second mating groove.

[0009] In some embodiments, when the end of the spring away from the first engaging portion abuts against the second arcuate groove, one end of the first engaging portion can disengage from the second mating groove.

[0010] In some embodiments, the angle-adjusting hinge further includes a pivot shaft, the first connecting portion having a first insertion hole, the second connecting portion having a second insertion hole, the pivot shaft being inserted into the first insertion hole and the second insertion hole, and the axis of the pivot shaft coinciding with the center of the first arcuate groove and the second arcuate groove.

[0011] In some embodiments, the angle-adjusting hinge further includes a second elastic element, the pivot is circumferentially limited and inserted into the first insertion hole, and the second elastic element is connected to the pivot and the second connecting portion, such that the second connecting portion drives the cushion to rotate toward the back panel.

[0012] In some embodiments, the first insertion hole is configured with an anti-rotation surface, and the rotating shaft is configured with a tangential surface adapted to the anti-rotation surface.

[0013] In some embodiments, the second elastic element includes a disc-shaped elastic structure, an insertion end located at the center of the disc-shaped elastic structure, and an arc-shaped hanging end located radially outward of the disc-shaped elastic structure. The rotating shaft has an insertion groove, the insertion end is inserted into the insertion groove, a pin is provided on the second connecting part, the arc-shaped hanging end is hung on the pin, and the pin is parallel to the rotating shaft.

[0014] According to another aspect of this application, an embodiment of the present invention also provides a piece of furniture, the furniture including a backrest, a cushion, and a cushion angle adjustment structure as described above.

[0015] Compared with the prior art, the cushion angle adjustment structure of this utility model has at least the following beneficial effects:

[0016] This utility model discloses a backrest angle adjustment structure, which includes a first connecting member, a second connecting member, and an angle adjustment hinge. The first connecting member is disposed on the backrest, and the second connecting member is disposed on the backrest. The angle adjustment hinge is hinged to the first and second connecting members respectively. The angle adjustment hinge has an initial position and a limit position. When the angle adjustment hinge switches from the initial position to the limit position, it switches from an angle adjustment state to a free rotation state. When it switches from the limit position to the initial position, it switches from a free rotation state to an angle adjustment state. This cycle repeats to meet the personalized needs of users of different heights for adjusting the backrest angle. By adjusting the angle between the backrest and the backrest to a suitable position, the user will not experience a feeling of emptiness in the lower back when leaning back, thus meeting the user's comfort needs.

[0017] On the other hand, the furniture provided by this utility model is manufactured based on the above-mentioned cushion angle adjustment structure, and its beneficial effects are the same as those of the above-mentioned cushion angle adjustment structure, which will not be repeated here.

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the cushion angle adjustment structure provided in this embodiment of the utility model;

[0021] Figure 2 A schematic diagram of another state of the cushion angle adjustment structure provided in this embodiment of the utility model;

[0022] Figure 3 An exploded view of the angle adjustment hinge of the cushion angle adjustment structure provided in this embodiment of the utility model;

[0023] Figure 4 An exploded structural diagram of the angle adjustment hinge of the cushion angle adjustment structure provided in this embodiment of the utility model from another perspective;

[0024] Figure 5 A schematic diagram of the first connecting part of the cushion angle adjustment structure provided in an embodiment of this utility model;

[0025] Figure 6 A schematic diagram of the spring in the cushion angle adjustment structure provided in this embodiment of the utility model;

[0026] Figure 7 A schematic diagram of the second connecting part of the cushion angle adjustment structure provided in an embodiment of this utility model;

[0027] Figure 8 A schematic diagram of the rotating shaft of the cushion angle adjustment structure provided in this embodiment of the utility model.

[0028] Figure 9 A schematic diagram of the assembly structure of the second elastic element, rotating shaft, and pin shaft of the cushion angle adjustment structure provided in this embodiment of the utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. First connecting member; 11. First branch rod; 12. Second branch rod;

[0031] 2. Second connector;

[0032] 31. First connecting part; 311. First arc-shaped groove; 312. First arc-shaped rack; 313. First mating groove; 314. First insertion hole; 315. Anti-rotation surface; 32. Second connecting part; 321. Second arc-shaped groove; 322. Second mating groove; 323. Second insertion hole; 33. Spring; 331. Second arc-shaped rack; 332. First snap-fit ​​part; 34. Rotating shaft; 341. Chord section; 342. Insertion groove; 35. Second elastic element; 351. Disc-shaped elastic structure; 352. Insertion end; 353. Arc-shaped hanging end; 36. Pin;

[0033] 4. Third connector. Detailed Implementation

[0034] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0035] In the description of this utility model, it should be clarified that the terms "first," "second," etc., in the specification, claims, and drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "back," "left," "right," "up," "down," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this utility model.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Example 1

[0038] like Figure 1-9 As shown, this utility model embodiment provides a cushion angle adjustment structure applied to furniture. The furniture includes a backrest and a cushion. The cushion angle adjustment structure includes a first connector 1, a second connector 2, and an angle adjustment hinge. The first connector 1 is disposed on the backrest, and the second connector 2 is disposed on the cushion. One end of the first connector 1 is hinged to one end of the second connector 2. The angle adjustment hinge has an initial position and a limit position. When switching from the initial position to the limit position, the angle adjustment hinge switches from an angle adjustment state to a free rotation state. When switching from the limit position to the initial position, the angle adjustment hinge switches from a free rotation state to an angle adjustment state.

[0039] In this embodiment, the cushion angle adjustment structure is applied to furniture, such as sofas and beds. The furniture includes a backrest and a cushion. The cushion angle adjustment structure in this embodiment includes a first connecting member 1, a second connecting member 2, and an angle adjustment hinge. By setting the first connecting member 1 on the backrest and the second connecting member 2 on the cushion, and hinged one end of the first connecting member 1 to one end of the second connecting member 2, the backrest and the cushion are rotatably connected. In this embodiment, the cushion angle adjustment structure sets the first connecting member 1 on the backrest and the second connecting member 2 on the cushion, and hinges the angle adjustment hinge to the first connecting member 1 and the second connecting member 2 respectively. The angle adjustment hinge has an initial position and a limit position. In the initial position, the backrest and the cushion are in contact, and in the limit position, the backrest and the cushion are at their maximum included angle. In this embodiment, when the angle adjustment hinge switches from the initial position to the extreme position, it switches from the angle adjustment state to the free rotation state. In the angle adjustment state, the hinge allows the first connecting member 1 and the second connecting member 2 to form a certain angle and lock at that angle. In the free rotation state, the hinge allows the first connecting member 1 and the second connecting member 2 to rotate freely. When switching from the extreme position to the initial position, the hinge switches from the free rotation state to the angle adjustment state. This cycle repeats, satisfying the personalized needs of users of different heights for adjusting the backrest angle. It adjusts the angle between the backrest and the backrest to a suitable angle, ensuring that the user does not experience a feeling of emptiness in the lower back when leaning back, thus meeting the user's comfort needs.

[0040] In some embodiments, the angle-adjusting hinge includes a first connecting portion 31 and a second connecting portion 32 capable of rotating and adjusting by a first preset increment. The first connecting portion 31 is hinged to the first connecting member 1, and the second connecting portion 32 is hinged to the second connecting member 2, so that the first connecting member 1 and the second connecting member 2 can rotate and adjust by a second preset increment.

[0041] In this embodiment, the angle adjustment hinge allows the first connecting part 31 and the second connecting part 32 to rotate and adjust their angles by a first preset increment, thereby allowing the first connecting member 1 and the second connecting member 2 to rotate and adjust by a second preset increment. This adjustment structure adjusts the angle between the backrest and the backrest of the furniture. When the user uses the furniture, adjusting the backrest and the backrest to a suitable angle will prevent the user from experiencing a feeling of emptiness in the lower back when leaning back, thus meeting the user's comfort needs.

[0042] In some implementations, the second preset increment angle is 5°.

[0043] The cushion angle adjustment structure in this embodiment allows the angle between the cushion and the back panel to be adjusted to multiples of 5°, meeting the personalized needs of users of different heights for cushion angle adjustment.

[0044] In some embodiments, the cushion angle adjustment structure further includes a third connector 4, wherein there are two first connectors 31, which are located on both sides of the second connector 32. One end of the third connector 4 is hinged to the first connector 31, and the other end of the third connector 4 is clamped between the two first connectors 31 and connected to the two first connectors 31.

[0045] In this embodiment, one end of the third connector 4 is hinged to the first connector 31, and the other end of the third connector 4 is clamped between the two first connectors 31 and connected to the two first connectors 31, thereby improving the stability of the connection between the angle adjustment hinge and the first connectors 31.

[0046] In some embodiments, the angle-adjusting hinge further includes a spring 33 and a first elastic element. The first connecting portion 31 is configured with a first arcuate groove 311, and the radial outer side wall of the first arcuate groove 311 is configured with a first arcuate rack 312. The second connecting portion 32 is configured with a second arcuate groove 321. The spring 33 is inserted into the first arcuate groove 311 and the second arcuate groove 321, and a second arcuate rack 331 adapted to the first arcuate rack 312 is configured on the side facing the first arcuate rack 312. The first elastic element is clamped between the radial inner side wall of the first arcuate groove 311 and the side of the spring 33 away from the second arcuate rack 331.

[0047] In this embodiment, the spring 33 is inserted into the first arc-shaped groove 311 and the second arc-shaped groove 321. Since the side of the spring 33 facing the first arc-shaped rack 312 is constructed with a second arc-shaped rack 331 that matches the radial outer sidewall of the first arc-shaped groove 311, and the radial inner sidewall of the first arc-shaped groove 311 and the side of the spring 33 away from the second arc-shaped rack 331 are clamped together with a first elastic member, the spring 33 is pushed towards the radial outer sidewall of the first arc-shaped groove 311 by the first elastic member, so that the first arc-shaped rack 312 and the second arc-shaped rack 331 mesh. When the cushion is pushed, the cushion drives the second connecting part 32 to rotate relative to the first connecting part 31 through the second connecting part 32, which causes the meshing position of the first arc-shaped rack 312 of the spring 33 to change, thereby adjusting the angle between the back plate and the cushion.

[0048] In some embodiments, the end of the spring 33 away from the back plate is provided with a first engaging portion 332, the end of the first arc-shaped groove 311 facing the first engaging portion 332 is provided with a first mating groove 313, and the end of the second arc-shaped groove 321 away from the first engaging portion 332 is provided with a second mating groove 322. When the first engaging portion 332 is inserted into the first mating groove 313, the first arc-shaped rack 312 can be separated from the second arc-shaped rack 331, and the end of the spring 33 away from the first engaging portion 332 is locked at the second mating groove 322.

[0049] In this embodiment, a first engaging portion 332 is constructed at the end of the spring 33 away from the back plate, a first mating groove 313 is constructed at the end of the first arc-shaped groove 311 facing the first engaging portion 332, and a second mating groove 322 is constructed at the end of the second arc-shaped groove 321 away from the first engaging portion 332. When the cushion is pushed, the cushion drives the second connecting portion 32 to rotate relative to the first connecting portion 31 through the second connecting portion 32, causing the engagement position of the first arc-shaped rack 312 of the spring 33 to change. When the first engaging portion 332 is inserted into the first mating groove 313, that is, the first connecting portion 31 rotates, causing the spring 33 to move to the position of the second arc-shaped groove 321 facing the cushion. At the extreme position, the first locking part 332 is inserted into the first mating groove 313. The first mating groove 313 allows the spring 33 to move radially inward toward the first arc-shaped groove 311, causing the first arc-shaped rack 312 to separate from the second arc-shaped rack 331. The end of the spring 33 away from the first locking part 332 is locked at the second mating groove 322, ensuring that the first arc-shaped rack 312 and the second arc-shaped rack 331 are separated. At this time, the cushion can be pushed back to the initial state. During the process of pushing the cushion back to the initial state, the end of the spring 33 away from the first locking part 332 is locked at the second mating groove 322. Therefore, the first arc-shaped rack 312 and the second arc-shaped rack 331 are always separated during this process.

[0050] In some embodiments, when the end of the spring 33 away from the first engaging portion 332 abuts against the second arcuate groove 321, the end of the spring 33 away from the first engaging portion 332 can disengage from the second mating groove 322.

[0051] In this embodiment, when the end of the spring 33 away from the first engaging part 332 abuts against the second arc-shaped groove 321, as the second connecting part 32 continues to rotate, the end of the second arc-shaped groove 321 can cause the end of the spring 33 away from the first engaging part 332 to disengage from the second mating groove 322. At this time, the first elastic member causes the second arc-shaped rack 331 of the spring 33 to mesh with the first arc-shaped rack 312.

[0052] In some embodiments, the angle-adjusting hinge further includes a pivot 34, the first connecting portion 31 has a first insertion hole 314, the second connecting portion 32 has a second insertion hole 323, the pivot 34 is inserted into the first insertion hole 314 and the second insertion hole 323, and the axis of the pivot 34 coincides with the center of the first arc groove 311 and the second arc groove 321.

[0053] In this embodiment, by inserting the rotating shaft 34 into the first insertion hole 314 of the first connecting part 31 and the second insertion hole 323 of the second connecting part 32, the axis of the rotating shaft 34 coincides with the center of the first arc groove 311 and the second arc groove 321, so that the first connecting part 31 and the second connecting part 32 can rotate relative to each other, and no interference occurs when the second arc rack 331 meshes with the first arc rack 312.

[0054] In some embodiments, the angle-adjusting hinge further includes a second elastic element 35, the pivot 34 is circumferentially inserted into the first insertion hole 314, and the second elastic element 35 is connected to the pivot 34 and the second connecting portion 32, so that the second connecting portion 32 drives the cushion to rotate toward the back panel.

[0055] In this embodiment, the cushion is circumferentially limited and inserted through the pivot 34 and the first insertion hole 314. The second elastic member 35 is connected to the pivot 34 and the second connecting part 32. The second elastic member 35 causes the second connecting part 32 to drive the cushion to rotate toward the back plate, so that the cushion can be reset to the initial state.

[0056] In some embodiments, the first insertion hole 314 is provided with an anti-rotation surface 315, and the rotating shaft 34 is provided with a tangential surface 341 adapted to the anti-rotation surface 315.

[0057] In this embodiment, an anti-rotation surface 315 is constructed in the first insertion hole 314, and a tangential surface 341 adapted to the anti-rotation surface 315 is constructed in the rotating shaft 34. Through the cooperation of the anti-rotation surface 315 and the tangential surface 341, the rotating shaft 34 is circumferentially limited and inserted into the first insertion hole 314.

[0058] In some embodiments, the second elastic element 35 includes a disc-shaped elastic structure 351, an insertion end 352 located at the center of the disc-shaped elastic structure 351, and an arc-shaped hanging end 353 located radially outward of the disc-shaped elastic structure 351. The rotating shaft 34 has an insertion groove 342, and the insertion end 352 is inserted into the insertion groove 342. A pin 36 is provided on the second connecting part 32, and the arc-shaped hanging end 353 is hung on the pin 36. The pin 36 is parallel to the rotating shaft 34. In this embodiment, the second elastic element 35 can drive the second connecting part 32 to rotate the cushion toward the back panel, which facilitates the cushion to return to its initial state.

[0059] In some embodiments, the first connector 1 includes a first branch rod 11 and a second branch rod 12 connected together. The first branch rod 11 is disposed on the back plate, and the second branch rod 12 is disposed at a second preset angle with the first branch rod 11, such that the end of the second branch rod 12 away from the first branch rod 11 extends toward the cushion.

[0060] In this embodiment, in the initial state, the cushion is attached to the back panel. The first connecting member 1 in this embodiment includes a first branch rod 11 and a second branch rod 12 connected together. By setting the first branch rod 11 on the back panel and setting the second branch rod 12 at a second preset angle to the first branch rod 11, this structure allows the end of the second branch rod 12 away from the first branch rod 11 to extend toward the cushion, so that the back panel supports the cushion through the first connecting member 1. By adjusting the angle between the back panel and the cushion through the cushion angle adjustment structure, the user will not experience a feeling of emptiness in the waist area when leaning back, thus meeting the user's comfort needs.

[0061] In some embodiments, in the initial state, i.e., when the cushion is in contact with the back panel, the first branch rod 11 is parallel to the second connecting member 2, which facilitates identification of the state of the cushion angle adjustment structure. The parallelism of the first branch rod 11 and the second connecting member 2 is the initial state (e.g., Figure 1 (As shown).

[0062] Example 2

[0063] This utility model embodiment also provides a piece of furniture, which includes a backrest, a cushion, and the cushion angle adjustment structure of embodiment 1.

[0064] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0065] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A cushion angle adjustment structure, applied to furniture, said furniture including a back panel and a cushion, characterized in that, The cushion angle adjustment structure includes a first connector (1), a second connector (2), and an angle adjustment hinge. The first connector (1) is disposed on the back plate, and the second connector (2) is disposed on the cushion. One end of the first connector (1) is hinged to one end of the second connector (2). The angle adjustment hinge is hinged to the first connector (1) and the second connector (2) respectively. The angle adjustment hinge has an initial position and a limit position. When switching from the initial position to the limit position, the angle adjustment hinge switches from the angle adjustment state to the free rotation state. When switching from the limit position to the initial position, the angle adjustment hinge switches from the free rotation state to the angle adjustment state.

2. The cushion angle adjustment structure according to claim 1, characterized in that, The angle-adjustable hinge includes a first connecting part (31) and a second connecting part (32) capable of rotating and adjusting by a first preset increment. The first connecting part (31) is hinged to the first connecting member (1), and the second connecting part (32) is hinged to the second connecting member (2), so that the first connecting member (1) and the second connecting member (2) can rotate and adjust by a second preset increment.

3. The cushion angle adjustment structure according to claim 2, characterized in that, The second preset increment is 5°; and / or, the cushion angle adjustment structure further includes a third connector (4), there are two first connectors (31), the two first connectors (31) are located on both sides of the second connector (32), one end of the third connector (4) is hinged to the first connector (31), and the other end of the third connector (4) is clamped between the two first connectors (31) and connected to the two first connectors (31).

4. The cushion angle adjustment structure according to claim 2, characterized in that, The angle-adjusting hinge further includes a spring (33) and a first elastic element. The first connecting part (31) is constructed with a first arc-shaped groove (311). The radial outer wall of the first arc-shaped groove (311) is constructed with a first arc-shaped rack (312). The second connecting part (32) is constructed with a second arc-shaped groove (321). The spring (33) is inserted into the first arc-shaped groove (311) and the second arc-shaped groove (321). A second arc-shaped rack (331) adapted to the first arc-shaped rack (312) is constructed on the side facing the first arc-shaped rack (312). The first elastic element is clamped between the radial inner wall of the first arc-shaped groove (311) and the side of the spring (33) away from the second arc-shaped rack (331).

5. The cushion angle adjustment structure according to claim 4, characterized in that, The end of the spring (33) away from the back plate is provided with a first engaging portion (332). The end of the first arc-shaped groove (311) facing the first engaging portion (332) is provided with a first mating groove (313). The end of the second arc-shaped groove (321) away from the first engaging portion (332) is provided with a second mating groove (322). When the first engaging portion (332) is inserted into the first mating groove (313), the first arc-shaped rack (312) can be separated from the second arc-shaped rack (331), and the end of the spring (33) away from the first engaging portion (332) is locked in the second mating groove (322).

6. The cushion angle adjustment structure according to claim 5, characterized in that, When the end of the spring (33) away from the first locking part (332) abuts against the second arc-shaped groove (321), the end of the spring (33) away from the first locking part (332) can disengage from the second mating groove (322).

7. The cushion angle adjustment structure according to claim 4, characterized in that, The angle adjustment hinge also includes a pivot (34). The first connecting part (31) has a first insertion hole (314), and the second connecting part (32) has a second insertion hole (323). The pivot (34) is inserted into the first insertion hole (314) and the second insertion hole (323). The axis of the pivot (34) coincides with the center of the first arc groove (311) and the second arc groove (321).

8. The cushion angle adjustment structure according to claim 7, characterized in that, The angle-adjusting hinge also includes a second elastic element (35), the pivot (34) is circumferentially limited and inserted into the first insertion hole (314), and the second elastic element (35) is connected to the pivot (34) and the second connecting part (32) so that the second connecting part (32) drives the cushion to rotate toward the back panel.

9. The cushion angle adjustment structure according to claim 8, characterized in that, The first insertion hole (314) is constructed with an anti-rotation surface (315), and the rotating shaft (34) is constructed with a tangential surface (341) adapted to the anti-rotation surface (315).

10. The cushion angle adjustment structure according to claim 8, characterized in that, The second elastic element (35) includes a disc-shaped elastic structure (351), an insertion end (352) located at the center of the disc-shaped elastic structure (351), and an arc-shaped hanging end (353) located radially outward of the disc-shaped elastic structure (351). The rotating shaft (34) has an insertion groove (342), and the insertion end (352) is inserted into the insertion groove (342). A pin (36) is provided on the second connecting part (32), and the arc-shaped hanging end (353) is hung on the pin (36). The pin (36) is parallel to the rotating shaft (34).

11. A type of furniture, characterized in that, The furniture includes a backrest, a cushion, and a cushion angle adjustment structure as described in any one of claims 1-10.

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