Beat chair frame and beat furniture

Abstract

The utility model relates to the technical field of furniture, provide a kind of rhythmic chair frame and rhythmic furniture, rhythmic chair frame includes support seat, seat base and screw rod mechanism, seat base is fixedly arranged relative to support seat, seat base is equipped with leg rest structure and backrest structure, the power output end of screw rod mechanism is connected with one of transmission in leg rest structure and backrest structure;Wherein, leg rest structure and backrest structure between being equipped with linkage rod, to make both synchronous movement and unfold or close to relative to seat base. Screw rod mechanism only needs to drive leg rest structure and backrest structure these two moving parts, reduce the load of screw rod mechanism, reduce its work torque, improve the durability and service life of screw rod mechanism, operation is also more energy-efficient. Linkage rod realizes the synchronous movement of leg rest structure and backrest structure, reduces manufacturing and assembly complexity, improves the quiet performance and reliability;Seat base does not need to have high bearing structure strength, overall structure is more reliable and cost is lower.

Description

Technical Field

[0001] This utility model relates to the field of furniture technology, and in particular to a rhythmic chair frame and rhythmic furniture. Background Technology

[0002] In technologies related to rhythmic furniture (such as the Space Rhythm Chair), a lead screw mechanism is often used to synchronously drive the movement of the seat base, backrest, and leg rest on the support base to switch between unfolded and reclining states. Under this transmission mechanism, as the backrest and leg rest flip, the seat base also moves accordingly, requiring the lead screw mechanism to bear the weight of the entire human body. This design significantly increases the driving load on the lead screw mechanism, thus affecting its service life.

[0003] Furthermore, the seat base itself needs to be connected to the support base below via hinges. The increase in hinge points not only makes the overall structure more complex but also increases the risk of noise generation during movement. At the same time, since the seat base needs to bear most of the body weight during movement, higher requirements are placed on its structural strength. Utility Model Content

[0004] This utility model provides a rhythmic chair frame to solve the problem in related technologies that use a lead screw mechanism to synchronously drive the overall movement of the seat base, backrest and leg rest, resulting in excessive load, complex structure and increased noise risk, while also facing the dual challenges of lifespan and structural strength of the seat base.

[0005] This utility model provides a rhythmic chair frame, comprising: Support base; A seat base is provided on the support base. The seat base is fixedly disposed relative to the support base. One end of the seat base is rotatably provided with a leg support structure, and the opposite end of the seat base is rotatably provided with a backrest structure. A lead screw mechanism is provided on the support base, and the power output end of the lead screw mechanism is connected to one of the leg support structure and the backrest structure. The leg support structure and the backrest structure are provided with a linkage rod that allows them to move in sync and unfold or close relative to the seat base.

[0006] According to the present invention, a rhythmic chair frame is provided, wherein the power output end of the lead screw mechanism is connected to the leg support structure for transmission, wherein when the leg support structure moves relative to the seat base, the backrest structure can be driven to move through the linkage rod.

[0007] According to the present invention, a rhythmic chair frame is provided, wherein the power output end of the lead screw mechanism is connected to the leg support structure for transmission, wherein when the leg support structure moves relative to the seat base, the backrest structure can be driven to move through the linkage rod; one end of the linkage rod is rotatably connected to the leg support structure, and the other end is rotatably connected to the backrest structure.

[0008] According to the rhythmic chair frame provided by this utility model, both the leg support structure and the backrest structure are provided with a first bearing structure at the rotational connection between them and the linkage rod. And / or, a second bearing structure is provided at the rotatable connection between the backrest structure and the seat base.

[0009] According to the present invention, a rhythmic chair frame includes a leg support structure comprising: Leg support frame; A transmission bracket is connected to the power output end of the lead screw mechanism. The first connecting component includes a first connecting plate and a second connecting plate, one end of which is rotatably connected to the leg support body; The second connecting assembly includes a third connecting plate and a fourth connecting plate. One end of both the first connecting plate and the second connecting plate can be rotatably connected to the seat base. The transmission bracket is fixedly connected to the fourth connecting plate, and the fourth connecting plate is rotatably connected to the linkage rod. The other end of the third connecting plate is rotatably connected to the middle of the first connecting plate, the middle of the third connecting plate is rotatably connected to the middle of the second connecting plate, the other end of the fourth connecting plate is rotatably connected to the other end of the first connecting plate, and the middle of the fourth connecting plate is rotatably connected to the other end of the second connecting plate.

[0010] According to the present invention, a rhythmic chair frame is provided in which a third bearing structure is provided at the rotational connection between the first connecting plate and the second connecting plate and the leg support body, the third connecting plate and the fourth connecting plate; And / or, both the third and fourth connecting plates are provided with a fourth bearing structure at the rotational connection points with the seat base. The first connecting plate and the second connecting plate are arranged in parallel and spaced apart, and the third connecting plate and the fourth connecting plate are arranged in parallel and spaced apart.

[0011] According to the present invention, a rhythmic chair frame is provided, wherein the seat base is provided with a first limiting structure, the first limiting structure being used to limit the extension limit position or the close-up limit position of the leg support structure.

[0012] According to the present invention, a rhythmic chair frame is provided, wherein the first limiting structure includes a first limiting column; The third connecting plate has a closing limiting groove on the side facing the fourth connecting plate, and the fourth connecting plate has a first unfolding limiting groove on the side facing the third connecting plate. In this configuration, one of the approaching limiting groove and the first unfolding limiting groove abuts against the first limiting column to limit the movement position of the leg support structure relative to the seat base.

[0013] According to the present invention, a rhythmic chair frame is provided, wherein the seat base is provided with a second limiting structure, the second limiting structure being used to limit the maximum unfolding position of the backrest structure.

[0014] According to the present invention, a rhythmic chair frame is provided, wherein the second limiting structure includes a second limiting column, and the backrest structure is provided with a second unfolding limiting groove, the second unfolding limiting groove abutting against the second limiting column to limit the backrest structure to the unfolding limit position.

[0015] This utility model also provides a rhythmic furniture, including the above-mentioned rhythmic chair frame.

[0016] The rhythmic chair frame provided by this utility model is fixedly installed on the support base via the seat base and no longer participates in the movement. The lead screw mechanism only needs to drive the leg support structure and the backrest structure, two moving parts, instead of driving the entire seat base that bears the main weight. This greatly reduces the load on the lead screw mechanism and lowers its working torque, thereby significantly improving the durability and service life of the lead screw mechanism, and making its operation more energy-efficient.

[0017] Using a single linkage rod to achieve synchronous movement of the leg support structure and the backrest structure not only reduces manufacturing and assembly complexity, but also improves quietness and reliability during movement.

[0018] By keeping the seat base fixed and serving only as a static support structure to bear the weight of the human body, while the backrest and leg rest are purely moving parts, the seat base does not need to have high load-bearing structural strength. The seat base can focus on static strength and stability, making the overall structure more reliable and lower in cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1This is a schematic diagram of the cooperative structure of the rhythm chair frame and the rhythm motor core provided by this utility model, wherein the rhythm chair frame is in a close-up state.

[0021] Figure 2 This is a schematic diagram of the cooperative structure of the rhythm chair frame and the rhythm motor core provided by this utility model, wherein the rhythm chair frame is in the unfolded state.

[0022] Figure 3 yes Figure 2 A schematic diagram of its breakdown.

[0023] Figure 4 This is a schematic diagram showing the cooperation between a portion of the leg support structure of the rhythmic chair frame in its unfolded state and the first limiting structure.

[0024] Figure 5 This is a schematic diagram showing the cooperation between a portion of the backrest structure of the rhythmic chair frame in its unfolded state and the second limiting structure.

[0025] Figure label: 100. Support base; 200. Seat base; 300, Leg support structure; 310, Leg support frame; 320, Transmission bracket; 330, First connecting assembly; 331, First connecting plate; 332, Second connecting plate; 340, Second connecting assembly; 341, Third connecting plate; 3411, Close-in limiting groove; 342, Fourth connecting plate; 3421, First unfolding limiting groove; 400. Backrest structure; 410. Second unfolding limiting groove; 500. Screw mechanism; 600. Linkage rod; 710. First bearing structure; 720. Second bearing structure; 730. Third bearing structure; 740. Fourth bearing structure; 810. First limiting post; 820. Second limiting post; 900. Rhythm motor core; 910. Fixed base frame; 920. Rhythm support; 930. Drive mechanism. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] The following is combined with Figures 1-5This invention describes a rhythmic chair frame and rhythmic furniture. In this embodiment, the rhythmic furniture is described as a space rhythmic chair, which includes a rhythmic core 900, a rhythmic chair frame mounted on the rhythmic core 900, and a sofa upholstery panel fitted onto the rhythmic chair frame.

[0028] Understandably, referring to Figures 1 to 3 In some examples of this utility model, the rhythmic chair frame includes a support base 100, a seat base 200 and a screw mechanism 500. The seat base 200 is disposed on the support base 100 and is fixedly disposed relative to the support base 100. One end of the seat base 200 is rotatably provided with a leg support structure 300, and the other end of the seat base 200 is rotatably provided with a backrest structure 400. The lead screw mechanism 500 is mounted on the support base 100, and the power output end of the lead screw mechanism 500 is connected to one of the leg support structure 300 and the backrest structure 400. The leg support structure 300 and the backrest structure 400 are provided with a linkage rod 600 so that the two can move synchronously and unfold or move closer to the seat base 200.

[0029] The rhythmic chair frame provided by this utility model is fixedly installed on the support base 100 via the seat base 200 and no longer participates in the movement. The lead screw mechanism 500 only needs to drive two moving parts, the leg support structure 300 and the backrest structure 400, without driving the entire seat base 200 that bears the main weight. This greatly reduces the load on the lead screw mechanism 500 and lowers its working torque, thereby significantly improving the durability and service life of the lead screw mechanism 500, and making its operation more energy-efficient.

[0030] The use of a single linkage rod 600 to achieve synchronous movement of the leg support structure 300 and the backrest structure 400 not only reduces the complexity of manufacturing and assembly, but also improves the quietness and reliability during movement.

[0031] By keeping the seat base 200 fixed and serving only as a static support structure to bear the weight of the human body, while the backrest and leg rest are purely moving parts, the seat base 200 does not need to have high load-bearing structural strength. The seat base 200 can focus on static strength and stability, making the overall structure more reliable and lower in cost.

[0032] Understandably, referring to Figures 1 to 3In some examples of this utility model, the rhythm core 900 includes a fixed base 910, a rhythm support 920, and a drive mechanism 930. The rhythm support 920 is movably mounted on the fixed base 910, and the drive mechanism 930 is mounted on the fixed base 910. The power output end of the drive mechanism 930 is connected to the rhythm support 920 to drive the rhythm support 920 to reciprocate relative to the fixed base 910. The support base 100 is fixedly connected to the rhythm support 920.

[0033] It should be noted that in some examples of this utility model, the above-mentioned rhythmic furniture has three rhythmic modes, which can be understood as multi-dimensional rhythm, such as: left-right rhythm alone, front-back rhythm alone, or left-right rhythm combined with front-back rhythm.

[0034] By configuring the rhythmic support 920 as a relatively fixed base 910, it can rhythmically move forward and backward and / or left and right. The left-right and forward / backward movements can be freely switched, and the switching is convenient. The structure is simple and low-cost, providing users with a more comprehensive health experience: First, multi-dimensional rhythmic movement can deeply stimulate various organs and tissues, significantly improving blood circulation efficiency; second, the composite rhythmic mode can more effectively promote lymphatic drainage and gastrointestinal motility; third, the bidirectional switching motion design avoids fatigue from single-direction movement, making the rhythmic process more comfortable and natural. Different directions of rhythmic movement produce differentiated tactile feedback, not only enriching the user experience but also specifically meeting the user's personalized health needs, thus qualitatively improving the functionality and comfort of the rhythmic furniture.

[0035] It should be noted that the aforementioned lead screw mechanism 500 also includes a power motor, a transmission lead screw, and a screw sleeve. The power motor drives the screw sleeve to rotate, and the screw sleeve rotates relative to the transmission lead screw. The transmission lead screw serves as the power output end of the lead screw mechanism 500 and is in transmission cooperation with the leg support structure 300.

[0036] Of course, in some other examples, the power motor drives the transmission screw to rotate, the screw rotates relative to the threaded sleeve, and the threaded sleeve, as the power output end of the screw mechanism 500, is in transmission cooperation with the leg support structure 300.

[0037] It is understood that in some examples of this utility model, the drive mechanism 930 includes a drive motor, a transmission crankshaft, a rocker arm, and an elastic transmission structure. The drive motor is mounted on a fixed base 910, and the transmission crankshaft is rotatably mounted on the fixed base 910. One end of the transmission crankshaft is connected to the output shaft of the drive motor via a pulley transmission assembly. One end of the rocker arm is provided with a connecting hole, through which the transmission crankshaft passes. The rotation center of the transmission crankshaft is eccentrically set with the center of the connecting hole. The other end of the rocker arm is connected to one end of the elastic transmission structure, and the other end of the elastic transmission structure is connected to the rhythmic bracket 920.

[0038] With the above structure, due to the eccentric design, the rotational motion generated by the drive motor is converted into eccentric motion, thereby generating a periodic torque on the transmission crankshaft, which causes the rhythm bracket 920 to reciprocate (back and forth or left and right) relative to the fixed base frame 910. The structure is compact and provides flexible, efficient and precise motion control.

[0039] Of course, in other examples, the drive mechanism 930 can also be magnetically driven, using a magnet and a coil. By changing the energization state of the coil, an attractive or repulsive force is generated between the coil and the magnet, thereby driving the rhythmic seat to move.

[0040] Understandably, referring to Figures 1 to 3 In some examples of this utility model, the power output end of the lead screw mechanism 500 is connected to the leg support structure 300 via a transmission connection. When the leg support structure 300 moves relative to the seat base 200, the backrest structure 400 can be moved via the linkage rod 600. The lead screw mechanism 500 drives the leg support structure 300 to move, and the linkage rod 600 rigidly drives the backrest structure 400 to achieve precise synchronization, thereby completing the overall posture change with minimal load.

[0041] Of course, in other examples, the power output end of the lead screw mechanism 500 is connected to the backrest structure 400 via a transmission connection, which is not limited here.

[0042] In some examples of this utility model, one end of the linkage rod 600 is rotatably connected to the leg support structure 300, and the other end is rotatably connected to the backrest structure 400.

[0043] The aforementioned rotary connection forms a rigid kinematic chain, establishing a defined geometric relationship between the movements of the leg support structure 300 and the backrest structure 400. Any angular change in the leg support structure 300 will, without delay or condition, force a corresponding angular change in the backrest structure 400, ensuring absolute synchronicity in their unfolding / closed movements. The rotary connection design significantly reduces motion resistance at the connection point.

[0044] The linkage rod 600 uses a rotating connection at both ends. Under the premise of ensuring absolute synchronization, it not only avoids motion interference, but also reduces frictional resistance and eliminates internal stress. With a reliable, efficient and low-cost transmission structure, it achieves precise linkage between the leg support structure 300 and the backrest structure 400.

[0045] Specifically, refer to Figures 2 to 4 In some examples of this utility model, a first bearing structure 710 is provided at the rotatable connection between the leg support structure 300 and the backrest structure 400 and the linkage rod 600, and a second bearing structure 720 is provided at the rotatable connection between the backrest structure 400 and the seat base 200.

[0046] The design of the first bearing structure 710 and the second bearing structure 720 ensures that the movement trajectory of the leg rest and backrest is highly accurate, smooth, and stable, without any jamming or shaking, achieving the precision mechanical feel required for high-end products. The bearing design provides stable and reliable rotational support, capable of withstanding radial forces in all directions and a certain axial force, which can make the assembly tighter and reduce the possibility of noise generation.

[0047] It should be noted that the first bearing structure 710 and the second bearing structure 720 mentioned above can be ball bearings, needle bearings, etc. Of course, in some other examples, the first bearing structure 710 may be provided only at the rotational connection between the leg support structure 300 and the backrest structure 400 and the linkage rod 600; or, the second bearing structure 720 may be provided only at the rotational connection between the backrest structure 400 and the seat base 200, which is not limited here.

[0048] Specifically, refer to Figures 1 to 4 In some examples of this utility model, the leg support structure 300 includes a leg support frame 310, a transmission bracket 320, a first connecting component 330, and a second connecting component 340.

[0049] The leg support body 310 is installed at the front end of the seat base 200, and the transmission bracket 320 is connected to the power output end of the lead screw mechanism 500. The first connecting component 330 includes a first connecting plate 331 and a second connecting plate 332, one end of which can be rotatably connected to the leg support body 310. The second connecting assembly 340 includes a third connecting plate 341 and a fourth connecting plate 342. One end of both the first connecting plate 331 and the second connecting plate 332 can be rotatably connected to the seat base 200. The transmission bracket 320 is fixedly connected to the fourth connecting plate 342, and the fourth connecting plate 342 is rotatably connected to the linkage rod 600. The other end of the third connecting plate 341 is rotatably connected to the middle of the first connecting plate 331, the middle of the third connecting plate 341 is rotatably connected to the middle of the second connecting plate 332, the other end of the fourth connecting plate 342 is rotatably connected to the other end of the first connecting plate 331, and the middle of the fourth connecting plate 342 is rotatably connected to the other end of the second connecting plate 332.

[0050] It should be noted that in some examples of this utility model, the above-mentioned middle connection can be considered as the position between the two ends of the corresponding component, or it can be the middle position with equal size, but it does not necessarily mean that it is the middle position with equal size.

[0051] With the above configuration, the linear output of the lead screw of the lead screw mechanism 500 acts on the fourth connecting plate 342 through the transmission bracket 320. Then, through the central hinge point between the third connecting plate 341 and the first connecting plate 331 and the second connecting plate 332, the linear input is converted into a large-angle rotational lifting motion of the leg support frame 310. The kinematic chain formed by multiple connecting plates not only amplifies the stroke but also precisely constrains the movement trajectory of the leg support structure 300, ensuring a smooth and vibration-free flipping process.

[0052] The thrust of the transmission screw is distributed through the fourth connecting plate 342 to the ends and middle hinge points of the first connecting plate 331 and the second connecting plate 332, forming a multi-directional force component. It is coordinated and linked by the third connecting plate 341, effectively utilizing the characteristics of power transmission amplification and direction conversion. The load-bearing leg support can be driven with a smaller screw thrust, which significantly reduces the actual load and power requirements of the screw mechanism 500 and improves the system's energy efficiency and durability.

[0053] In addition, multiple connecting plates are interconnected and integrated within a limited space via rotating joints, forming a compact transmission unit with high space utilization. Simultaneously, the load is shared by multiple sets of connecting plates and hinge points, avoiding stress concentration at single points, enhancing the overall structural rigidity and fatigue resistance, and making it suitable for long-term, frequent use scenarios.

[0054] Understandably, referring to Figures 2 to 4 In some examples of this utility model, a third bearing structure 730 is provided at the rotational connection between the first connecting plate 331 and the second connecting plate 332 and the leg support body 310, the third connecting plate 341 and the fourth connecting plate 342, and a fourth bearing structure 740 is provided at the rotational connection between the third connecting plate 341 and the fourth connecting plate 342 and the seat base 200.

[0055] The design of the aforementioned third bearing structure 730 and fourth bearing structure 740 ensures that the movement trajectory of the first connecting plate 331, second connecting plate 332, third connecting plate 341, fourth connecting plate 342 and leg support body 310 is highly accurate, stable and smooth, without jamming or shaking, achieving the precision mechanical feel required for high-end products; the bearing design provides stable and reliable rotational support, can withstand radial forces in all directions and a certain axial force, which can make the assembly tighter and reduce the possibility of noise generation.

[0056] It should be noted that the aforementioned third bearing structure 730 and fourth bearing structure 740 can be ball bearings, needle bearings, etc. Of course, in some other examples, the third bearing structure 730 may be provided only at the rotational connection points between the first connecting plate 331 and the second connecting plate 332 and the leg support body 310, the third connecting plate 341 and the fourth connecting plate 342, or the fourth bearing structure 740 may be provided only at the rotational connection points between the third connecting plate 341 and the fourth connecting plate 342 and the seat base 200. This is not limited here.

[0057] It is understood that in some examples of this utility model, the first connecting plate 331 and the second connecting plate 332 are arranged in parallel and spaced apart, and the third connecting plate 341 and the fourth connecting plate 342 are arranged in parallel and spaced apart.

[0058] The parallel and spaced arrangement of the connecting plates creates a parallelogram mechanism during movement, ensuring that the movement trajectory is a precise rotation. This enhances the rigidity and stability of the entire leg support structure 300. In other words, the above structure prevents the leg support structure 300 from lateral twisting or becoming unstable during movement or under load, thereby enhancing the safety and reliability of use.

[0059] It should be noted that, referring to Figures 1 to 3 In some examples of this utility model, the left and right sides of the leg support body 310 are provided with a first connecting component 330 and a second connecting component 340. Similarly, there are two linkage rods 600, which are distributed on the left and right sides of the seat to improve the stability and reliability of the transmission.

[0060] Understandably, referring to Figures 2 to 4 In some examples of this utility model, the seat base 200 is provided with a first limiting structure, which is used to limit the extension limit position or the close-up limit position of the leg support structure 300.

[0061] The above structure includes a first limiting structure that provides a rigid stop at the endpoint of the movement trajectory of the leg support structure 300. This stop interferes with the corresponding components on the leg support structure 300, cutting off the power transmission path and forcibly terminating the rotational movement of the leg support frame 310. This precisely defines the safe movement range of the leg support, preventing it from over-expanding and causing structural instability or over-retracting and causing component collisions. Ultimately, this ensures reliability, riding safety, and the durability of the mechanism.

[0062] Specifically, refer to Figure 4 In some examples of this utility model, the first limiting structure includes a first limiting column 810; The third connecting plate 341 has a closing limiting groove 3411 on the side facing the fourth connecting plate 342, and the fourth connecting plate 342 has a first unfolding limiting groove 3421 on the side facing the third connecting plate 341. Among them, one of the approach limiting groove 3411 and the first unfolding limiting groove 3421 abuts against the first limiting column 810 to limit the movement position of the leg support structure 300 relative to the seat base 200.

[0063] The first limiting post 810 abuts against one of the inner walls of the first unfolding limiting groove 3421 and the closing limiting groove 3411, thereby forming a stop and limiting position. This helps to improve the certainty and reliability of the movement end position of the leg support structure 300 when it unfolds and closes, and effectively avoids movement overshoot. At the same time, it simplifies the structure and reduces the complexity and cost of limiting multiple components separately.

[0064] It should be noted that, in some examples of this utility model, when referring to the unfolding of the rhythmic chair frame, it can be understood that the first projection of the rotational connection position of the linkage rod 600 and the fourth connecting plate 342 on the horizontal plane is located between the second projection of the rotational connection position of the fourth connecting plate 342 and the seat base 200 on the horizontal plane and the third projection of the rotational connection position of the fourth connecting plate 342 and the second connecting plate 332 on the horizontal plane.

[0065] Reference Figure 4 In some examples of this utility model, the first unfolding limiting groove 3421 is located on the side of the fourth connecting plate 342 away from the linkage rod 600. Similarly, when the rhythm chair frame is unfolded, the fourth projection of the first unfolding limiting groove 3421 on the horizontal plane is located between the second projection of the rotational connection position between the fourth connecting plate 342 and the seat base 200 on the horizontal plane and the third projection of the rotational connection position between the fourth connecting plate 342 and the second connecting plate 332 on the horizontal plane.

[0066] Reference Figure 4 In some examples of this utility model, when the reference rhythm chair frame is unfolded, the fifth projection of the aforementioned approach limiting groove 3411 on the horizontal plane is located between the sixth projection of the rotational connection position of the third connecting plate 341 and the seat base 200 on the horizontal plane and the seventh projection of the rotational connection position of the third connecting plate 341 and the second connecting plate 332 on the horizontal plane.

[0067] It is also understandable that, in some other examples, the aforementioned first limiting structure can also be a limiting block, which is installed on the seat base 200. A stop protrusion is correspondingly provided on the third connecting plate 341 and the fourth connecting plate 342. When the leg support structure 300 moves to its limit position, the stop protrusion will strike the limiting block, thereby stopping the movement. The structure is simple. Of course, the aforementioned stop protrusion is not limited to being located on the third connecting plate 341 and the fourth connecting plate 342; it can also be located on the leg support frame 310 or the transmission bracket 320. Alternatively, in some examples, a sliding protrusion and an arc-shaped guide rail can be used to limit the movement of the leg support structure 300.

[0068] Understandably, referring to Figure 2 , Figure 3 and Figure 5 In some examples of this utility model, the seat base 200 is provided with a second limiting structure, which is at least used to limit the unfolded limit position of the backrest structure 400.

[0069] Through the aforementioned design, the second limiting structure precisely limits the maximum unfolding angle of the backrest structure 400 by providing an absolute mechanical stop to its rotational movement. This effectively ensures the structural stability and passenger safety of the backrest structure 400 at its extreme positions, preventing mechanical failure or the risk of overall tipping over due to excessive reclining. Simultaneously, this structure reliably transmits forces to the seat base 200, protecting the lead screw mechanism 500 from excessive load impacts, thereby enhancing the reliability, durability, and safety performance of the entire rhythmic chair frame.

[0070] Of course, in other examples, the second limiting structure described above may also have the same structural function as the first limiting structure, which can limit the backrest's unfolded limit position and its approach limit position, and this is not limited here.

[0071] Specifically, refer to Figure 5 In some examples of this utility model, the second limiting structure includes a second limiting post 820, and the backrest structure 400 is provided with a second unfolding limiting groove 410. The second unfolding limiting groove 410 abuts against the second limiting post 820 to limit the backrest structure 400 to the unfolding limit position.

[0072] With the above configuration, when the backrest structure 400 is extended to its limit position relative to the seat under the linkage of the linkage rod 600 and the leg support structure 300, the second limiting post 820 abuts against the inner wall of the second extension limiting groove 410. This not only limits the maximum extension angle of the backrest structure 400, but also provides a certain support performance, improving the certainty and reliability of the movement end position of the backrest structure 400 when it is extended, and effectively avoiding overshoot. At the same time, it simplifies the structure and reduces the complexity and cost of limiting.

[0073] Of course, in other examples, the second limiting structure described above can also be a limiting block. A stop protrusion is provided on the backrest structure 400, and the stop protrusion and the limiting block abut against each other, which has the same effect. Alternatively, in some examples, a sliding protrusion and an arc-shaped guide rail can be used to limit the movement of the backrest structure 400.

[0074] It is understood that in some examples of this utility model, the first limiting post 810 and the second limiting post 820 can be rotating posts rotatably mounted on the seat, or they can be rollers, rotating bearings, etc. The rotating design makes the contact process smoother and gentler, helping to improve the operational quality and user experience of the adjustment process. Of course, in other examples, the first limiting post 810 and the second limiting post 820 can also be fixedly mounted on the seat base 200, which is not limited here.

[0075] It is also understandable that, based on the setting of the first and second limiting structures, the transmission screw and the threaded sleeve in the screw mechanism 500 are tightly fitted together, so that the transmission screw and the threaded sleeve will not reciprocate due to the presence of a gap, i.e., reciprocate extension and shortening, which helps to avoid the backrest structure 400 and the leg support structure 300 from alternating up and down tilting.

[0076] It should be noted that, referring to Figures 1 to 3 In some examples of this utility model, the backrest structure 400 includes two backrest frames spaced apart on the left and right and two connecting pillars arranged between the two backrest frames. The two ends of the connecting pillars are respectively fixedly connected to the two backrest frames one by one to improve the stability of the support.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A beat chair frame, characterized by, include: Support base (100); A seat base (200) is disposed on the support base (100). The seat base (200) is fixedly disposed relative to the support base (100). One end of the seat base (200) is rotatably provided with a leg support structure (300), and the other end of the seat base (200) is rotatably provided with a backrest structure (400). A lead screw mechanism (500) is provided on the support base (100), and the power output end of the lead screw mechanism (500) is connected to one of the leg support structure (300) and the backrest structure (400) for transmission. The leg support structure (300) and the backrest structure (400) are provided with a linkage rod (600) that allows them to work together, so that they can move synchronously and unfold or move closer to the seat base (200).

2. The beat chair frame of claim 1, wherein, The power output end of the lead screw mechanism (500) is connected to the leg support structure (300) for transmission. When the leg support structure (300) moves relative to the seat base (200), the backrest structure (400) can be driven to move through the linkage rod (600). One end of the linkage rod (600) is rotatably connected to the leg support structure (300), and the other end is rotatably connected to the backrest structure (400).

3. The beat chair frame of claim 2, wherein, Both the leg support structure (300) and the backrest structure (400) are provided with a first bearing structure (710) at the rotational connection between them and the linkage rod (600). And / or, a second bearing structure (720) is provided at the rotatable connection between the backrest structure (400) and the seat base (200).

4. The beat chair frame according to any one of claims 1 to 3, characterized in that, The leg support structure (300) includes: Leg support frame (310); A transmission bracket (320) is connected to the power output end of the lead screw mechanism (500). The first connecting assembly (330) includes a first connecting plate (331) and a second connecting plate (332), one end of which is rotatably connected to the leg support body (310). The second connecting assembly (340) includes a third connecting plate (341) and a fourth connecting plate (342). One end of both the first connecting plate (331) and the second connecting plate (332) is rotatably connected to the seat base (200). The transmission bracket (320) is fixedly connected to the fourth connecting plate (342), and the fourth connecting plate (342) is rotatably connected to the linkage rod (600). The other end of the third connecting plate (341) is rotatably connected to the middle of the first connecting plate (331), the middle of the third connecting plate (341) is rotatably connected to the middle of the second connecting plate (332), the other end of the fourth connecting plate (342) is rotatably connected to the other end of the first connecting plate (331), and the middle of the fourth connecting plate (342) is rotatably connected to the other end of the second connecting plate (332).

5. The beat chair frame of claim 4, wherein, The first connecting plate (331) and the second connecting plate (332) are each provided with a third bearing structure (730) at the rotational connection between them and the leg support body (310), the third connecting plate (341) and the fourth connecting plate (342). And / or, both the third connecting plate (341) and the fourth connecting plate (342) are provided with a fourth bearing structure (740) at the rotatable connection between them and the seat base (200). The first connecting plate (331) and the second connecting plate (332) are arranged in parallel and spaced apart, and the third connecting plate (341) and the fourth connecting plate (342) are arranged in parallel and spaced apart.

6. The beat chair frame of claim 4, wherein, The seat base (200) is provided with a first limiting structure, which is used to limit the extension limit position or the close limit position of the leg support structure (300).

7. The beat chair frame of claim 6, wherein, The first limiting structure includes a first limiting post (810); The third connecting plate (341) has a closing limiting groove (3411) on the side facing the fourth connecting plate (342), and the fourth connecting plate (342) has a first unfolding limiting groove (3421) on the side facing the third connecting plate (341). One of the approaching limiting groove (3411) and the first unfolding limiting groove (3421) abuts against the first limiting column (810) to limit the movement position of the leg support structure (300) relative to the seat base (200).

8. The beat chair frame of claim 1, wherein, The seat base (200) is provided with a second limiting structure, which is at least used to limit the maximum unfolding position of the backrest structure (400).

9. The beat chair frame of claim 8, wherein, The second limiting structure includes a second limiting post (820), and the backrest structure (400) is provided with a second unfolding limiting groove (410). The second unfolding limiting groove (410) abuts against the second limiting post (820) to limit the backrest structure (400) to the unfolding limit position.

10. A rhythmic furniture, characterized by Includes the rhythmic chair frame as described in any one of claims 1 to 9.

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