Backrest adjusting mechanism and sofa

Abstract

The utility model belongs to the technical field of household articles, and discloses a backrest adjusting mechanism and a sofa, the backrest adjusting mechanism comprises a driving mechanism, a linkage mechanism, an auxiliary support and a backrest assembly, and the driving mechanism is connected to a sofa main frame; the linkage mechanism is connected to the output end of the driving mechanism and is driven by the driving mechanism to switch between a first position and a second position in a reciprocating manner, the second position is higher than the first position, and a gap is formed between the linkage mechanism at the second position and a cushion of the sofa; the auxiliary support is connected to the linkage mechanism and provided with a supporting position unfolded relative to the linkage mechanism and a containing position folded relative to the linkage mechanism, and the auxiliary support at the supporting position is located in the notch. The backrest assembly comprises a main backrest and an auxiliary backrest, the main backrest is arranged on the linkage mechanism, and the auxiliary backrest is arranged on the auxiliary support. According to the backrest adjusting mechanism and the sofa, stable lifting of the backrest of the sofa is achieved, meanwhile, it can be guaranteed that the backrest has good supporting performance and comfort, and the use experience feeling of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of household articles, in particular to a backrest adjusting mechanism and a sofa. Background Art

[0002] To adapt to different user groups and improve the flexibility of sofa use, existing electric sofas are usually provided with a backrest adjusting mechanism to realize the lifting adjustment of the backrest.

[0003] In existing sofas that can realize the lifting of the backrest, when the backrest is raised, it is far from the seat cushion of the sofa. At this time, there is a gap between the backrest and the seat cushion of the sofa, resulting in poor support for the user's back after the backrest is raised, poor comfort for the user leaning on the sofa backrest, and poor use experience.

[0004] Therefore, there is an urgent need for a backrest adjusting mechanism and a sofa to solve the above problems existing in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a backrest adjusting mechanism and a sofa, which can ensure good support and comfort of the backrest while realizing the stable lifting of the sofa backrest, and improve the user's use experience.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In the first aspect, a backrest adjusting mechanism is provided, including:

[0008] A driving mechanism configured to be connected to the main frame of the sofa;

[0009] A linkage mechanism connected to the output end of the driving mechanism and reciprocally switched between a first position and a second position under the drive of the driving mechanism. The second position is higher than the first position, and a gap is formed between the linkage mechanism at the second position and the seat cushion of the sofa;

[0010] An auxiliary support connected to the linkage mechanism and having a support position unfolded relative to the linkage mechanism and a storage position folded relative to the linkage mechanism. The auxiliary support at the support position is located in the gap;

[0011] A backrest assembly including a main backrest and an auxiliary backrest. The main backrest is arranged on the linkage mechanism, and the auxiliary backrest is arranged on the auxiliary support.

[0012] As a preferred solution of the backrest adjusting mechanism provided by the utility model, the linkage mechanism includes a first connecting rod, a second connecting rod, and a bearing rod;

[0013] One end of the first link is configured to be movably connected to the main frame of the sofa, and the other end is movably connected to the first end of the carrier rod; and the first link is connected to the output end of the driving mechanism;

[0014] One end of the second link is configured to be movably connected to the main frame of the sofa, and the other end is movably connected to the second end of the carrier rod; and the second link is fixedly connected to the auxiliary bracket;

[0015] The first link, the second link and the carrier rod are configured to form a four-bar linkage with the main frame of the sofa, and the main backrest is provided on the carrier rod.

[0016] As a preferred solution of the backrest adjustment mechanism provided by the present invention, the backrest adjustment mechanism further includes:

[0017] A fixed bracket, the fixed bracket is configured to be connected to the main frame of the sofa, and the driving mechanism, the first link and the second link are all movably connected to the fixed bracket.

[0018] As a preferred solution of the backrest adjustment mechanism provided by the present invention, the housing of the driving mechanism is rotatably connected to the fixed bracket, and the output end of the driving mechanism is telescopically arranged in the housing and rotatably connected to the first link;

[0019] Both the first link and the second link are rotatably connected to the fixed bracket, and both the first link and the second link are rotatably connected to the carrier rod.

[0020] As a preferred solution of the backrest adjustment mechanism provided by the present invention, the first link is provided with a first hinge portion, a second hinge portion and a third hinge portion. The first hinge portion is hinged to the fixed bracket, the second hinge portion is hinged to the output end of the driving mechanism, and the third hinge portion is hinged to the carrier rod; the second hinge portion and the third hinge portion are respectively arranged on both sides of the first hinge portion;

[0021] And / or, the second link is provided with a fourth hinge portion, a fifth hinge portion and a fixed connection portion. The fourth hinge portion is hinged to the fixed bracket, the fifth hinge portion is hinged to the carrier rod, and the fixed connection portion is connected to the auxiliary bracket; the fixed connection portion and the fifth hinge portion are respectively arranged on both sides of the fourth hinge portion.

[0022] As a preferred solution of the backrest adjustment mechanism provided by the present invention, at least one of the fixed bracket, the first link and the carrier rod is provided with a first limiting member, and the first limiting member is detachably abutted against the fixed bracket or the first link or the carrier rod, so that the linkage mechanism is stopped at the first position;

[0023] And / or, at least one of the fixed bracket, the second connecting rod and the bearing rod is provided with a second limiting member, and the second limiting member is detachably abutted against the fixed bracket, the second connecting rod or the bearing rod so that the linkage mechanism is stopped at the second position.

[0024] As a preferred solution of the backrest adjusting mechanism provided by the present invention, the fixed bracket includes:

[0025] Two fixed rods are arranged at intervals, and the two fixed rods are configured to be connected to the main frame of the sofa;

[0026] At least one first connecting rod is provided and is connected between the two fixed rods;

[0027] The mounting bracket is connected to the first connecting rod and is movably connected to the housing of the driving mechanism;

[0028] The first connecting rod includes two first rods arranged at intervals and a second connecting rod connected between the two first rods. The second connecting rod includes two second rods arranged at intervals. The first rod, the second rod and the fixed rod correspond one by one. The first rod and the second rod are both movably connected to the fixed rod and the bearing rod, and the second connecting rod is movably connected to the output end of the driving mechanism.

[0029] As a preferred solution of the backrest adjusting mechanism provided by the present invention, the auxiliary bracket includes a first support rod, a second support rod and a third support rod which are sequentially bent and connected;

[0030] One end of the first support rod far from the second support rod is fixedly connected to the linkage mechanism, and the third support rod is provided with the auxiliary backrest;

[0031] The first support rod and the third support rod extend to different sides of the second support rod respectively.

[0032] As a preferred solution of the backrest adjusting mechanism provided by the present invention, at least part of the auxiliary bracket at the support position is coplanar with the linkage mechanism.

[0033] In a second aspect, a sofa is provided, including a main frame of the sofa, a seat cushion and the backrest adjusting mechanism as described above, and the seat cushion and the backrest adjusting mechanism are both arranged on the main frame of the sofa.

[0034] Advantages of the present invention:

[0035] The present utility model provides a backrest adjustment mechanism and a sofa including the backrest adjustment mechanism. The linkage mechanism can drive the main backrest to switch between a lower first position and a higher second position under the drive of the drive mechanism, so that the backrest adjustment mechanism has two different support heights for users to use. When the linkage mechanism switches to the first position, the auxiliary bracket and the auxiliary backrest are driven by the linkage mechanism to switch to a storage position folded relative to the linkage mechanism. At this time, the main backrest supports the user's back. When it is necessary to raise the main backrest, under the drive of the drive mechanism, the linkage mechanism moves to the second position and forms a gap with the seat cushion of the sofa. At the same time, the auxiliary bracket is driven by the linkage mechanism to move into this gap to switch to the support position. At this time, the auxiliary bracket and the linkage mechanism are relatively unfolded, and the auxiliary backrest on the auxiliary bracket and the main backrest on the linkage mechanism can jointly support the user's back, avoiding the existence of vacant positions when the user sits and leans, ensuring that the backrest assembly can provide good support and comfort in both the first position and the second position, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required to be used in the embodiments of the present utility model will be briefly introduced below. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the drawings.

[0037] Figure 1 It is the first view of the sofa in the low-back state provided by the specific embodiment of the present utility model;

[0038] Figure 2 It is the second view of the sofa in the low-back state provided by the specific embodiment of the present utility model;

[0039] Figure 3 It is the first view of the sofa in the high-back state provided by the specific embodiment of the present utility model;

[0040] Figure 4 It is the second view of the sofa in the high-back state provided by the specific embodiment of the present utility model;

[0041] Figure 5 It is the third view of the sofa in the high-back state provided by the specific embodiment of the present utility model (hiding the auxiliary backrest);

[0042] Figure 6 It is the structural schematic diagram of the backrest adjustment mechanism in the extended state provided by the specific embodiment of the present utility model;

[0043] Figure 7It is a schematic structural view of the backrest adjusting mechanism provided by the specific embodiment of the present utility model when in a folded state;

[0044] Figure 8 It is an axonometric view of the adjusting frame of the backrest adjusting mechanism provided by the specific embodiment of the present utility model when in a folded state;

[0045] Figure 9 It is a plan view of the adjusting frame of the backrest adjusting mechanism provided by the specific embodiment of the present utility model when in a folded state;

[0046] Figure 10 It is a schematic view of the adjusting frame of the backrest adjusting mechanism provided by the specific embodiment of the present utility model when unfolded;

[0047] Figure 11 It is a plan view of the adjusting frame of the backrest adjusting mechanism provided by the specific embodiment of the present utility model when in an unfolded state.

[0048] In the figure:

[0049] 100, backrest adjusting mechanism; 200, main frame of the sofa; 300, seat cushion;

[0050] 201, mounting side plate;

[0051] 1, driving mechanism; 2, linkage mechanism; 3, auxiliary bracket; 4, backrest assembly; 5, fixed bracket; 6, first ear plate; 7, second ear plate;

[0052] 10, notch;

[0053] 11, housing; 12, output end;

[0054] 21, first connecting rod; 22, second connecting rod; 23, bearing rod; 24, first limiting member; 25, second limiting member;

[0055] 211, first hinge portion; 212, second hinge portion; 213, third hinge portion; 214, first rod; 215, second connecting rod;

[0056] 220, second rod; 221, fourth hinge portion; 222, fifth hinge portion; 223, fixed portion;

[0057] 31, first support rod; 32, second support rod; 33, third support rod;

[0058] 41, main backrest; 42, auxiliary backrest;

[0059] 51, fixed rod; 52, first connecting rod; 53, mounting frame. Specific embodiments

[0060] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0061] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0062] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0063] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0064] The term "and / or" in this embodiment is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in the present utility model generally represents an "or" relationship between the front and rear associated objects.

[0065] In the embodiments of the present utility model, the same reference numerals represent the same components, and for the sake of brevity, the detailed descriptions of the same components are omitted in different embodiments.

[0066] Such as Figures 1 to 5As shown, it is a schematic structural diagram of the sofa provided by this embodiment. The sofa includes a sofa main frame 200, a seat cushion 300, and a backrest adjustment mechanism 100. The seat cushion 300 and the backrest adjustment mechanism 100 are both arranged on the sofa main frame 200. The backrest adjustment mechanism 100 is adjustable in height relative to the sofa main frame 200 to adjust the sofa to a low-back state or a high-back state.

[0067] As Figure 1 and Figure 2 shown, the sofa is in a low-back state. As Figure 3 , Figure 4 and Figure 5 shown, the sofa is in a high-back state, which can adapt to different users and be adjusted according to user needs. The specific adjustment is achieved through the backrest adjustment mechanism 100.

[0068] As Figure 6 and Figure 7 shown, it is a schematic diagram of the backrest adjustment mechanism 100 provided by this embodiment. The backrest adjustment mechanism 100 is applied to the sofa, which can realize the stable lifting of the sofa backrest, and at the same time ensure good support and comfort of the backrest, improving the user experience.

[0069] Specifically, the backrest adjustment mechanism 100 includes a driving mechanism 1, a linkage mechanism 2, an auxiliary support 3, and a backrest assembly 4. Among them, in combination with Figure 8 , the driving mechanism 1 includes a housing 11 and an output end 12. Its housing 11 is configured to be connected to the sofa main frame 200; the linkage mechanism 2 is connected to the output end 12 of the driving mechanism 1 and reciprocates between a first position and a second position under the drive of the driving mechanism 1. The second position is higher than the first position, and a gap 10 is formed between the linkage mechanism 2 at the second position and the seat cushion 300 of the sofa (as Figure 5 shown); the auxiliary support 3 is connected to the linkage mechanism 2 and has a support position unfolded relative to the linkage mechanism 2 and a storage position folded relative to the linkage mechanism 2. The auxiliary support 3 at the support position is located within the gap 10. The backrest assembly 4 includes a main backrest 41 and an auxiliary backrest 42. The main backrest 41 is arranged on the linkage mechanism 2, and the auxiliary backrest 42 is arranged on the auxiliary support 3.

[0070] In the backrest adjustment mechanism 100 provided by the embodiment of the present application, the linkage mechanism 2 can drive the main backrest 41 to switch between a lower first position and a higher second position under the drive of the driving mechanism 1, so that the backrest adjustment mechanism 100 has two different support heights for users to use.

[0071] As Figure 1 , Figure 2 and Figure 7As shown, when the linkage mechanism 2 switches to the first position, the auxiliary support 3 and the auxiliary backrest 42 are driven by the linkage mechanism 2 to switch to the storage position folded relative to the linkage mechanism 2. The auxiliary backrest 42 is hidden behind the main backrest 41. At this time, the main backrest 41 supports the user's back, the backrest adjustment mechanism 100 is in the folded state, and the sofa is in the low-back state. Since the unused auxiliary backrest 42 is hidden, the neatness and beauty of the sofa in the low-back state can be ensured.

[0072] As Figure 3 , Figure 5 and Figure 6 shown, when it is necessary to raise the main backrest 41, driven by the drive mechanism 1, the linkage mechanism 2 moves to the second position and forms a gap 10 with the seat cushion 300 of the sofa. At the same time, the auxiliary support 3 is driven by the linkage mechanism 2 to move into this gap 10 to switch to the support position. At this time, the auxiliary support 3 and the linkage mechanism 2 are relatively unfolded, and the auxiliary backrest 42 on the auxiliary support 3 and the main backrest 41 on the linkage mechanism 2 can jointly support the user's back, avoiding a vacant position when the user sits back, ensuring that the backrest assembly 4 can provide good support and comfort in both the first position and the second position, and improving the user experience. At this time, the backrest adjustment mechanism 100 is in the unfolded state, and the sofa is in the high-back state. When the sofa provided in this embodiment switches to the high-back state, there will be no vacancy between the main backrest 41 and the seat cushion 300. Instead, the auxiliary support 3 drives the auxiliary backrest 42 to fill the vacancy between the main backrest 41 and the seat cushion 300, improving the support comfort for the user's back.

[0073] In this embodiment, as Figure 6 and Figure 11 shown, at least a part of the auxiliary support 3 switched to the support position is coplanar with the linkage mechanism 2. Specifically, the main backrest 41 and the auxiliary backrest 42 are respectively arranged at the positions where the linkage mechanism 2 and the auxiliary support 3 are coplanar with each other. When the auxiliary support 3 is driven by the linkage mechanism 2 to switch to the support position, the main backrest 41 and the auxiliary backrest 42 are almost coplanar to form a whole backrest assembly 4 for supporting the user's back.

[0074] In some embodiments of the present application, as Figure 8As shown, the linkage mechanism 2 includes a first connecting rod 21, a second connecting rod 22, and a bearing rod 23. The first connecting rod 21 and the second connecting rod 22 are arranged at intervals. One end of the first connecting rod 21 is configured to be movably connected to the main frame 200 of the sofa, and the other end is movably connected to the first end of the bearing rod 23; and the first connecting rod 21 is connected to the output end 12 of the driving mechanism 1; one end of the second connecting rod 22 is configured to be movably connected to the main frame 200 of the sofa, and the other end is movably connected to the second end of the bearing rod 23. The first connecting rod 21, the second connecting rod 22, and the bearing rod 23 are configured to form a four-bar linkage mechanism with the main frame 200 of the sofa, and the main backrest 41 is provided on the bearing rod 23. When the output end 12 of the driving mechanism 1 drives the first connecting rod 21 to move relative to the main frame 200 of the sofa, the first connecting rod 21 drives the second connecting rod 22 to move relative to the main frame 200 of the sofa through the bearing rod 23, so as to realize the bearing rod 23 driving the main backrest 41 to perform a lifting motion. The lifting motion of the main backrest 41 is realized through the four-bar linkage mechanism, and the transmission accuracy is relatively high, and the transmission process is stable and reliable.

[0075] Further, the auxiliary support 3 is fixedly connected to the second connecting rod 22. When the second connecting rod 22 moves relative to the main frame 200 of the sofa, the second connecting rod 22 drives the auxiliary support 3 to switch between a storage position and a support position, that is, the auxiliary support 3 moves to a position Figure 9 relatively folded with the linkage mechanism 2 as shown, or moves to a position Figure 11 relatively unfolded with the linkage mechanism 2 as shown.

[0076] In some embodiments of the present application, referring to Figure 8 , the backrest adjustment mechanism 100 further includes a fixed bracket 5. The fixed bracket 5 is configured to be connected to the main frame 200 of the sofa, and the driving mechanism 1, the first connecting rod 21, and the second connecting rod 22 are all movably connected to the fixed bracket 5. Specifically, the housing 11 of the driving mechanism 1 is movably connected to the fixed bracket 5, and the output end 12 is movably connected to the first connecting rod 21. That is, the first connecting rod 21, the second connecting rod 22, the bearing rod 23, and the fixed bracket 5 form a four-bar linkage mechanism, and the driving mechanism 1 is arranged on this four-bar linkage mechanism to drive the four-bar linkage mechanism to move, so as to realize the lifting adjustment of the main backrest 41 and synchronously realize the support and storage of the auxiliary backrest 42. By providing the fixed bracket 5, the four-bar linkage mechanism and the driving mechanism 1 can be assembled into a whole and installed in the main frame 200 of the sofa, reducing the assembly difficulty and helping to improve the production efficiency of the sofa. The fixed bracket 5, the linkage mechanism 2, the auxiliary support 3, and the driving mechanism 1 form the adjustment frame of the backrest adjustment mechanism for installing the backrest assembly 4.

[0077] Of course, in other embodiments, the driving mechanism 1, the first connecting rod 21, and the second connecting rod 22 can also be directly movably connected to the main frame 200 of the sofa.

[0078] In some embodiments of the present application, the housing 11 of the driving mechanism 1 is rotatably connected to the fixed bracket 5. The output end 12 of the driving mechanism 1 is telescopically arranged in the housing 11 and rotatably connected to the first connecting rod 21. That is, when the driving mechanism 1 is driven, it performs a linear telescopic motion and rotates relative to both the fixed bracket 5 and the second connecting rod 22. Both the first connecting rod 21 and the second connecting rod 22 are rotatably connected to the fixed bracket 5, and both the first connecting rod 21 and the second connecting rod 22 are rotatably connected to the bearing rod 23. That is, the moving points of the four-bar linkage formed by the fixed bracket 5, the first connecting rod 21, the second connecting rod 22, and the bearing rod 23 are all hinge points, which are easy to connect, have a low assembly difficulty, and can ensure the motion stability.

[0079] Exemplarily, the driving mechanism 1 is one of a linear motor, an electric cylinder, a cylinder, and an oil cylinder.

[0080] In this embodiment, as Figure 8 shown, the fixed bracket 5 includes a fixed rod 51, a first connecting rod 52, and a mounting bracket 53. Among them, two fixed rods 51 are arranged at intervals, and the two fixed rods 51 are configured to be fixedly connected to the main frame 200 of the sofa; at least one first connecting rod 52 is provided and is connected between the two fixed rods 51 for improving the connection stability between the two fixed rods 51. The mounting bracket 53 is connected to the first connecting rod 52 and is movably connected to the housing 11 of the driving mechanism 1. Exemplarily, two first connecting rods 52 are provided, effectively improving the strength and anti-deformation ability of the entire fixed bracket 5. The two first connecting rods 52 are distributed at intervals up and down. The mounting bracket 53 is arranged on the lower first connecting rod 52 and is located on one side facing away from the upper first connecting rod 52. The mounting bracket 53 is generally a U-shaped frame, and its two ends are connected to the first connecting rod 52, such as by welding connection, for providing a mounting base for the driving mechanism 1.

[0081] Continuing to refer to Figure 8 , the first connecting rod 21 includes two first rods 214 arranged at intervals and a second connecting rod 215 connected between the two first rods 214. The second connecting rod 22 includes two second rods 220 arranged at intervals. The first rod 214, the second rod 220, and the fixed rod 51 correspond one by one. The first rod 214 and the second rod 220 are both hinged to the fixed rod 51, and the first rod 214 and the second rod 220 are both hinged to the bearing rod 23. Further, two bearing rods 23 are provided, and the two bearing rods 23 are respectively hinged to the corresponding first connecting rod 2! and the second connecting rod 22. The main backrest 41 is arranged on the two bearing rods 23, and the bearing support is more stable and reliable. The four-bar linkage formed by the two first rods 214, the two second rods 220, the two bearing rods 23, and the two fixed rods 51 is more stable during transmission, improving the stability when the sofa backrest is lifted and lowered.

[0082] Further, the second connecting rod 215 is movably connected to the output end 12 of the driving mechanism 1, specifically by hinging. The second connecting rod 215 is disposed substantially horizontally, facilitating the hinging with the output end 12 of the driving mechanism 1.

[0083] In other embodiments, on the premise of not interfering with the movement of other components, a third connecting rod may also be provided between the two second rods 220.

[0084] As Figure 11 shown, a first ear plate 6 is provided on the mounting bracket 53 of the fixed bracket 5, and the housing 11 of the driving mechanism 1 is hinged to the first ear plate 6. A second ear plate 7 is provided on the second connecting rod 215, and the output end 12 of the driving mechanism 1 is hinged to the second ear plate 7. Welding connections may be used between the first ear plate 6 and the mounting bracket 53, and between the second ear plate 7 and the second connecting rod 215.

[0085] Refer to Figure 2 and Figure 4 , there is an installation space on the main frame 200 of the sofa for installing the backrest adjustment mechanism 100. Two installation side plates 201 are spaced apart in this installation space, and the two fixing rods 51 of the fixed bracket 5 are fixedly connected to the two installation side plates 201 respectively, specifically by using threaded parts such as bolts or screws for connection.

[0086] As Figure 9 shown, the first link 21 is provided with a first hinge portion 211, a second hinge portion 212, and a third hinge portion 213. The first hinge portion 211 and the third hinge portion 213 are specifically provided on the first rod 214, and the second hinge portion 212 is provided on the second ear plate 7 of the second connecting rod 215. The first hinge portion 211 is hinged to the fixing rod 51, the second hinge portion 212 is hinged to the output end 12 of the driving mechanism 1, and the third hinge portion 213 is hinged to the bearing rod 23. The second hinge portion 212 and the third hinge portion 213 are disposed on both sides of the first hinge portion 211. Therefore, when the output end 12 of the driving mechanism 1 drives the first rod 214, the first rod 214 swings around the first hinge portion 211. Thus, when the output end 12 of the driving mechanism 1 extends out of the housing 11, the bearing rod 23 drives the main backrest 41 to descend, and conversely, when the output end 12 of the driving mechanism 1 retracts into the housing 11, the bearing rod 23 drives the main backrest 41 to ascend.

[0087] Continue to refer to Figure 9, a fourth hinge portion 221, a fifth hinge portion 222 and a fixed portion 223 are provided on the second rod member 220 of the second connecting rod 22. The fourth hinge portion 221 is hinged to the fixing rod 51, the fifth hinge portion 222 is hinged to the load-bearing rod 23, and the fixed portion 223 is fixedly connected to the auxiliary bracket 3; the fixed portion 223 and the fifth hinge portion 222 are respectively arranged on both sides of the fourth hinge portion 221. When the second connecting rod 22 moves under the drive of the load-bearing rod 23, the second connecting rod 22 swings around the fourth hinge portion 221. Therefore, when the load-bearing rod 23 descends, the auxiliary bracket 3 swings upward under the drive of the second connecting rod 22 to move to the back of the load-bearing rod 23 to be stored and hidden. Conversely, when the load-bearing rod 23 rises, the auxiliary bracket 3 swings downward under the drive of the second connecting rod 22. Figure 10 As shown, the auxiliary backrest 42 gradually swings along the arrow direction to a position coplanar with the supporting rod 23 of the linkage mechanism 2, so that the auxiliary backrest 42 and the main backrest 41 jointly support the user's back.

[0088] The structural form in which the first connecting rod 21 swings around the first hinge part 211 and the structural form in which the second connecting rod 22 swings around the fourth hinge part 221 can balance the forces at both ends of the first connecting rod 21 and the second connecting rod 22, thereby improving the force-bearing performance of the entire backrest adjustment mechanism 100 and avoiding damage due to load after long-term use.

[0089] In some embodiments of this application, see Figure 8 A first limiting member 24 is provided on at least one of the fixed bracket 5, the first connecting rod 21 and the load-bearing rod 23. The first limiting member 24 is detachably abutted against the fixed bracket 5, the first connecting rod 21 or the load-bearing rod 23 to stop the linkage mechanism 2 at the first position, thereby preventing the main backrest 41 from descending beyond the travel, and stably limiting the sofa in the low backrest state.

[0090] And / or, a second limiter 25 is provided on at least one of the fixed bracket 5, the second connecting rod 22 and the load-bearing rod 23, and the second limiter 25 is detachably abutted against the fixed bracket 5 or the second connecting rod 22 or the load-bearing rod 23 to stop the linkage mechanism 2 at the second position, thereby preventing the main backrest 41 from rising beyond the travel, and stably limiting the sofa in the high backrest state.

[0091] Specifically Figure 9 and Figure 11 For example, a first stopper 24 is provided on the first rod 214 of the first connecting rod 21, and a second stopper 25 is provided on the second rod 220 of the second connecting rod 22. When the backrest is switched to the low backrest state, the first rod 214 and the fixed rod 51 are relatively close to each other. When the first stopper 24 abuts against the fixed rod 51, the driving mechanism 1 stops driving, and the linkage mechanism 2 and the auxiliary bracket 3 remain in this position. Figure 9The state shown. When switching to the high-backrest state, the second rod 220 approaches the fixed rod 51 relatively. When the second limiting member 25 abuts against the fixed rod 51, the driving mechanism 1 stops driving, and the linkage mechanism 2 and the auxiliary bracket 3 are maintained at this position, as Figure 11 The state shown.

[0092] Exemplarily, the first limiting member 24 and the second limiting member 25 are limiting columns, which can be welded at corresponding positions, or the first limiting member 24 and the second limiting member 25 can also be limiting plates, etc. The structure and shape thereof are not limited herein.

[0093] In some embodiments of the present application, referring to Figure 9 , the auxiliary bracket 3 includes a first support rod 31, a second support rod 32, and a third support rod 33 that are sequentially bent and connected. One end of the first support rod 31 away from the second support rod 32 is fixedly connected to the second link 22 of the linkage mechanism 2. The auxiliary backrest 42 is disposed on the third support rod 33. The first support rod 31 and the third support rod 33 extend to different sides of the second support rod 32 respectively. The auxiliary bracket 3 with this structure not only has high strength but also can save space, has strong bearing capacity, and is not easily deformed. Exemplarily, an obtuse angle is formed between the first support rod 31 and the second support rod 32, and an acute angle is formed between the second support rod 32 and the third support rod 33. In other embodiments, the structure of the auxiliary bracket 3 is not limited thereto, and the angles between the first support rod 31, the second support rod 32, and the third support rod 33 are not limited thereto either, and can be designed according to specific requirements.

[0094] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. Backrest adjustment mechanism, characterized in that Comprising: A driving mechanism (1), configured to be connected to the main frame (200) of the sofa; A linkage mechanism (2), connected to the output end (12) of the driving mechanism (1), and reciprocally switched between a first position and a second position under the drive of the driving mechanism (1), the second position being higher than the first position, and a gap (10) being formed between the linkage mechanism (2) at the second position and the seat cushion (300) of the sofa; An auxiliary support (3), connected to the linkage mechanism (2), and having a support position unfolded relative to the linkage mechanism (2) and a storage position folded relative to the linkage mechanism (2), the auxiliary support (3) at the support position being located within the gap (10); A backrest assembly (4), including a main backrest (41) and an auxiliary backrest (42), the main backrest (41) being provided on the linkage mechanism (2), and the auxiliary backrest (42) being provided on the auxiliary support (3).

2. The backrest adjustment mechanism according to claim 1, characterized in that, The linkage mechanism (2) includes a first link (21), a second link (22), and a carrier rod (23); One end of the first link (21) is configured to be movably connected to the main frame (200) of the sofa, and the other end is movably connected to the first end of the carrier rod (23); and the first link (21) is connected to the output end (12) of the driving mechanism (1); One end of the second link (22) is configured to be movably connected to the main frame (200) of the sofa, and the other end is movably connected to the second end of the carrier rod (23); and the second link (22) is fixedly connected to the auxiliary support (3); The first link (21), the second link (22), and the carrier rod (23) are configured to form a four-bar linkage with the main frame (200) of the sofa, and the main backrest (41) is provided on the carrier rod (23).

3. The backrest adjusting mechanism according to claim 2, characterized in that, The backrest adjustment mechanism further includes: A fixed bracket (5), the fixed bracket (5) being configured to be connected to the main frame (200) of the sofa, and the driving mechanism (1), the first link (21), and the second link (22) are all movably connected to the fixed bracket (5).

4. The backrest adjusting mechanism according to claim 3, wherein, The housing (11) of the driving mechanism (1) is rotatably connected to the fixed bracket (5), and the output end (12) of the driving mechanism (1) is telescopically provided in the housing (11) and rotatably connected to the first link (21); The first link (21) and the second link (22) are both rotatably connected to the fixed bracket (5), and the first link (21) and the second link (22) are both rotatably connected to the carrier rod (23).

5. The backrest adjusting mechanism according to claim 4, characterized in that, The first link (21) is provided with a first hinge portion (211), a second hinge portion (212) and a third hinge portion (213). The first hinge portion (211) is hinged to the fixed bracket (5), the second hinge portion (212) is hinged to the output end (12) of the driving mechanism (1), and the third hinge portion (213) is hinged to the load-carrying rod (23). The second hinge portion (212) and the third hinge portion (213) are respectively arranged on both sides of the first hinge portion (211). And / or, the second link (22) is provided with a fourth hinge portion (221), a fifth hinge portion (222) and a fixing portion (223). The fourth hinge portion (221) is hinged to the fixed bracket (5), the fifth hinge portion (222) is hinged to the load-carrying rod (23), and the fixing portion (223) is connected to the auxiliary bracket (3). The fixing portion (223) and the fifth hinge portion (222) are respectively arranged on both sides of the fourth hinge portion (221).

6. The backrest adjustment mechanism according to claim 3, characterized in that, At least one of the fixed bracket (5), the first link (21) and the load-carrying rod (23) is provided with a first limiting member (24). The first limiting member (24) is detachably abutted against the fixed bracket (5) or the first link (21) or the load-carrying rod (23) so that the linkage mechanism (2) is stopped at the first position. And / or, at least one of the fixed bracket (5), the second link (22) and the load-carrying rod (23) is provided with a second limiting member (25). The second limiting member (25) is detachably abutted against the fixed bracket (5) or the second link (22) or the load-carrying rod (23) so that the linkage mechanism (2) is stopped at the second position.

7. The backrest adjustment mechanism according to claim 3, characterized in that, The fixed bracket (5) includes: Two fixed rods (51) are arranged at intervals. The two fixed rods (51) are configured to be connected to the main frame (200) of the sofa. At least one first connecting rod (52) is provided and is connected between the two fixed rods (51). The mounting bracket (53) is connected to the first connecting rod (52) and is movably connected to the housing (11) of the driving mechanism (1). The first link (21) includes two first rods (214) arranged at intervals and a second connecting rod (215) connected between the two first rods (214). The second link (22) includes two second rods (220) arranged at intervals. The first rods (214), the second rods (220) and the fixed rods (51) correspond one by one. The first rods (214) and the second rods (220) are both movably connected to the fixed rods (51) and the load-carrying rod (23), and the second connecting rod (215) is movably connected to the output end (12) of the driving mechanism (1).

8. The backrest adjustment mechanism according to any one of claims 1-7, characterized in that, The auxiliary bracket (3) includes a first support rod (31), a second support rod (32) and a third support rod (33) which are sequentially bent and connected. One end of the first support rod (31) far from the second support rod (32) is fixedly connected to the linkage mechanism (2), and the auxiliary backrest (42) is arranged on the third support rod (33). The first support rod (31) and the third support rod (33) extend to different sides of the second support rod (32) respectively.

9. The backrest adjustment mechanism according to any one of claims 1-7, characterized in that At least part of the auxiliary support (3) at the support position is coplanar with the linkage mechanism (2).

10. A sofa, characterized in that, It includes a sofa main frame (200), a seat cushion (300) and a backrest adjusting mechanism according to any one of claims 1-9, and the seat cushion (300) and the backrest adjusting mechanism are both arranged on the sofa main frame (200).

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