A massage chair frame with adjustable seat and back angles

Abstract

This utility model belongs to the field of massage chair technology, and relates to a massage chair frame with coordinated adjustment of seat and back angles. It includes a backrest assembly, a seat assembly, a seat base, a linkage assembly, and a first electric support rod. The backrest assembly and the seat assembly are connected to the seat base via the linkage assembly. Both the backrest assembly and the seat assembly are hinged to the same hinge point A on the seat base. The extension and retraction of the first electric support rod can drive the seat assembly and the backrest assembly to rotate synchronously around the hinge point A connected to the seat assembly. The cylinder of the first electric support rod is hinged to the seat base, and the drive shaft of the first electric support rod is hinged to either the seat assembly or the backrest assembly. This utility model achieves coordinated adjustment of seat and back angles through a single electric support rod and linkage assembly, which is not only simple and reliable in structure and low in manufacturing cost, but also conducive to obtaining ideal massage effects and a comfortable massage experience.

Description

Technical Field

[0001] This utility model relates to a massage chair frame with adjustable seat and back angles, belonging to the field of massage chair technology. Background Technology

[0002] Utility model patent application CN201420026449.0 discloses a massage chair in which the seat sliding frame assembly is mounted on the seat base frame assembly via a slide rail. Three independent electric support rods—specifically, a front sliding electric support rod, a seat electric support rod, and a leg electric support rod—allow for independent movement of the backrest, seat, and legs. However, several drawbacks have been observed during user experience: First, the use of three electric support rods and the sliding frame assembly's slide-mounted structure results in a complex massage chair structure and high manufacturing costs. Second, while the design allows for independent adjustment of the backrest, seat, and legs, it lacks coordinated adjustment of the seat, back, and leg angles, potentially limiting user comfort and personalization. Furthermore, with prolonged use, the slide rail, a critical load-bearing and sliding component, may experience wear, loosening, and other quality issues, affecting the massage chair's stability and lifespan. Utility Model Content

[0003] The purpose of this utility model is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0004] The technical solution provided by this utility model is as follows: A massage chair frame with coordinated adjustment of seat and back angles includes a backrest frame assembly, a seat surface assembly, a seat base frame, a connecting rod assembly, and a first electric support rod. The backrest frame assembly and the seat surface assembly are connected to the seat base frame through the connecting rod assembly. The backrest frame assembly and the seat surface assembly are both hinged to the same hinge point A on the seat base frame. The extension and retraction of the first electric support rod can drive the seat surface assembly and the backrest frame assembly to rotate synchronously around the hinge point A connected to the seat surface assembly.

[0005] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects: This utility model realizes the coordinated adjustment of the seat and back angle through an electric support rod and connecting rod assembly, which is not only simple in structure, reliable in structure, and low in manufacturing cost, but also conducive to obtaining ideal massage effect and comfortable massage experience.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the cylinder of the first electric strut is hinged to the seat base frame, and the drive shaft of the first electric strut is hinged to the seat assembly or the backrest frame assembly.

[0008] Furthermore, the linkage assembly includes a first link, a second link, and a third link, with one end of each of the first link, second link, and third link hinged together. The other end of the first link is hinged to the seat base frame, the other end of the second link is hinged to the seat surface assembly, and the other end of the third link is hinged to the backrest frame assembly.

[0009] The beneficial effect of adopting the above-mentioned further solution is that the first link, the second link, and the third link form a stable triangular structure by hinged at one end. During the force transmission process, the other end of the first link is hinged to the seat base frame, which plays a supporting role; the other end of the second link is hinged to the seat assembly, which is responsible for transmitting the driving force of the first electric support rod to the seat surface, thereby realizing the angle adjustment of the seat surface; and the other end of the third link is hinged to the backrest frame assembly, which ensures that the backrest can be adjusted synchronously with the angle change of the seat surface, thereby realizing the coordinated adjustment of the seat and back angles.

[0010] Furthermore, the seat assembly includes a seat body, a seat frame, and a seat rotating lug. The seat frame includes an upper seat mounting frame and a lower strut hinge frame. The seat body is mounted on the seat mounting frame. The seat rotating lug is located at one end of the seat mounting frame. The seat assembly is hinged to the seat base frame via the seat rotating lug.

[0011] The beneficial effects of adopting the above-mentioned further solution are that the seat mounting frame, as the supporting structure of the seat body, ensures the flatness and load-bearing capacity of the seat, while the lower strut hinge frame is connected to the electric strut, realizing the electric adjustment function of the seat angle. The seat rotating ear, as the hinge point between the seat assembly and the seat base frame, directly affects the coordinated adjustment effect of the seat and backrest by its position and structural design. By setting the seat rotating ear at one end of the seat mounting frame and hinged to the seat base frame, the seat assembly can rotate smoothly around this point, thereby keeping synchronized with the rotation of the backrest frame assembly.

[0012] Furthermore, it also includes a leg support assembly for supporting the user's legs. The leg support assembly includes a second electric strut, a leg strut hinge seat, a first connecting plate, a second connecting plate, and a support wheel bracket. The leg strut hinge seat is fixed on the seat mounting frame and includes two hinge lugs. One end of the first connecting plate and the second connecting plate are respectively hinged to the two hinge lugs of the leg strut hinge seat, and the other end of the first connecting plate and the second connecting plate are respectively hinged to both ends of the support wheel bracket. The cylinder of the second electric strut is hinged to the strut hinge frame, and the drive shaft of the second electric strut is hinged to the middle of the first connecting plate. The support wheel bracket is also provided with a support wheel.

[0013] The beneficial effect of adopting the above-mentioned further solution is that the hinge position of the cylinder of the second electric support rod directly affects the coordinated adjustment effect of the legs and the seat. The drive shaft of the first electric support rod is also hinged to the support rod hinge frame. The cylinder of the second electric support rod and the drive shaft of the first electric support rod are hinged on the same support rod hinge frame, so that the leg support assembly can remain synchronized with the rotation of the seat assembly and the backrest frame assembly.

[0014] Furthermore, the front end of the seat assembly is also provided with an arc-shaped inner front sealing plate.

[0015] Furthermore, armrests are provided on both sides of the seat base frame. The armrests, the backrest assembly, and the seat assembly are all hinged to the same hinge point A on the seat base frame, and the armrests, the third link, and the backrest assembly are all hinged to the same hinge point B.

[0016] The beneficial effect of adopting the above-mentioned further solution is that the armrests can be adjusted synchronously with the changes in the angle of the seat and backrest, maintaining the natural placement of the user's arms and improving the comfort and stability during massage.

[0017] Furthermore, the backrest frame assembly includes a backrest frame body, a U-shaped bracket, and a reinforcing rod. The U-shaped bracket is fixed to the backrest frame body, and the two ends of the reinforcing rod are respectively fixedly connected to the backrest frame body and the U-shaped bracket. The two ends of the U-shaped bracket are provided with backrest pivots, and the two sides of the seat base are provided with pivot supports. The backrest pivots are mounted on their respective pivot supports.

[0018] The beneficial effect of adopting the above-mentioned further solution is that the combined design of the U-shaped bracket and the reinforcing bar enhances the structural strength and stability of the backrest frame, enabling it to withstand greater pressure and impact.

[0019] Furthermore, the base frame is provided with a connecting rod seat, and the first connecting rod is hinged to the connecting rod seat.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the design of the connecting rod seat provides a stable hinge point for the first connecting rod, making the connecting rod more stable and reliable when transmitting power.

[0021] Furthermore, the end of the base frame is also provided with an outer front sealing plate.

[0022] The beneficial effects of adopting the above-mentioned further solution are that the outer front sealing plate not only improves the overall aesthetics of the massage chair frame, but also plays a role in preventing dust and dirt. It can prevent dust and debris from entering the interior of the chair frame, protect the internal mechanical structure from damage, and also make it convenient for users to clean and maintain.

[0023] Furthermore, the base frame is also equipped with casters.

[0024] The advantage of adopting the above-mentioned further solution is that the design of the casters makes the massage chair frame easy to move and transport, improving the convenience of use. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of the massage chair frame of this utility model in its initial state;

[0027] Figure 2 This is a front view of the massage chair frame of Embodiment 1 of the present invention when the seat is at its initial angle;

[0028] Figure 3 This is a front view of the massage chair frame in Embodiment 1 of this utility model with the backrest in a lying position.

[0029] Figure 4 This is a schematic diagram of the linkage assembly of this utility model;

[0030] Figure 5 This is a schematic diagram of the backrest frame assembly according to Embodiment 1 of this utility model;

[0031] Figure 6 This is a schematic diagram of the base frame of Embodiment 1 of this utility model;

[0032] Figure 7 A schematic diagram of the structure of the leg support assembly mounted on the seat assembly of this utility model;

[0033] Figure 8 This is a schematic diagram of the leg support assembly of this utility model;

[0034] Figure 9 This is a structural schematic diagram of the leg support assembly of this utility model from another perspective;

[0035] Figure 10 This is a front view of the leg support assembly of this utility model;

[0036] Figure 11 For the present utility model Figure 10 The right view;

[0037] Figure 12 This is a front view of the massage chair frame of Embodiment 2 of the present invention when the seat is at its initial angle;

[0038] Figure 13 This is a front view of the massage chair frame in Embodiment 2 of this utility model with the backrest in a lying position.

[0039] Figure 14 This is a schematic diagram of the base frame of Embodiment 2 of this utility model;

[0040] Figure 15 This is a schematic diagram of the backrest frame assembly according to Embodiment 2 of this utility model;

[0041] In the accompanying diagram of the instruction manual:

[0042] 100. Backrest frame assembly; 110. Backrest frame body; 120. U-shaped bracket; 130. Reinforcing rod; 140. Backrest pivot;

[0043] 200. Seat assembly; 210. Seat body; 220. Seat frame; 221. Seat mounting frame; 222. Support hinge frame; 230. Seat rotating lug;

[0044] 300. Base frame; 310. Outer front end plate; 320. Connecting rod seat; 330. Caster wheel; 340. Rotary shaft support;

[0045] 400. Link assembly; 401. First link; 402. Second link; 403. Third link;

[0046] 500. First electric strut;

[0047] 600. Leg support assembly; 610. Second electric strut; 620. Leg support hinge seat; 630. First connecting plate; 640. Second connecting plate; 650. Support wheel bracket; 660. Support wheel; 670. Inner front sealing plate;

[0048] 700, Handrail frame; 710, First hinge point; 720, Second hinge point. Detailed Implementation

[0049] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and do not imply any priority in order or any specific technical meaning. Furthermore, the concepts of "connection" and "linkage" mentioned in this application, unless otherwise specified, are considered to include both direct connection (linkage) and indirect connection (linkage).

[0050] When interpreting the description of this application, it should be clarified that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating directions or positional relationships, are based on the perspective and layout shown in the accompanying drawings. They are intended to facilitate explanation and simplify the description process, and are not absolute limitations on the actual location, construction method, or operating mode of the described device or element. Therefore, these terms should not be construed as restrictive interpretations of the content of this application.

[0051] The principles and features of this utility model are described below with reference to examples. The examples are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0052] Example 1:

[0053] like Figure 1 - Figure 3 As shown, a massage chair frame with coordinated adjustment of seat and back angles includes a backrest assembly 100, a seat assembly 200, a seat base frame 300, a linkage assembly 400, and a first electric support rod 500. The backrest assembly 100 and the seat assembly 200 are connected to the seat base frame 300 via the linkage assembly 400. The backrest assembly 100 and the seat assembly 200 are coaxially hinged to the seat base frame 300. The cylinder of the first electric support rod 500 is hinged to the seat base frame 300, and the drive shaft of the first electric support rod 500 is hinged to the seat assembly 200. When the first electric support rod 500 extends or retracts, it can drive the seat assembly 200 and the backrest assembly 100 to rotate synchronously around the hinge point A connected to the seat base frame 300, thereby achieving coordinated adjustment of the seat and back angles.

[0054] like Figure 4As shown, the linkage assembly 400 includes a first link 401, a second link 402, and a third link 403. One end of each of the first link 401, second link 402, and third link 403 is hinged together. The other end of the first link 401 is hinged to the seat base 300, the other end of the second link 402 is hinged to the seat surface assembly 200, and the other end of the third link 403 is hinged to the backrest frame assembly 100. The first link 401, second link 402, and third link 403, hinged at one end, form a stable triangular structure. In this structure, the other end of the first link 401, hinged to the seat base 300, provides a supporting foundation for the entire linkage assembly 400. When the drive shaft of the first electric support rod 500 extends outward, the thrust generated acts directly on the seat surface assembly 200 through the other end of the second link 402. This thrust causes the seat assembly 200 to rotate around its hinge point A with the seat base 300, thereby enabling flexible adjustment of the seat angle. Simultaneously, since the other ends of the second link 402 and the third link 403 are hinged together, the second link 402 pulls the third link 403 along with it during movement. The key function of the third link 403 is that its end furthest from the second link 402 is hinged to the backrest frame assembly 100. Therefore, as the second link 402 moves, the third link 403 correspondingly drives the backrest frame assembly 100 to rotate around the same hinge point A with the seat base 300, ensuring that the backrest closely follows the angle changes of the seat, thus achieving coordinated adjustment of the seat and backrest angles.

[0055] like Figure 1 As shown, armrest frames 700 are also provided on both sides of the seat base 300. The armrest frames 700, the backrest frame assembly 100, and the seat surface assembly 200 are all hinged to the same hinge point A on the seat base 300, and the armrest frames 700, the third connecting rod 403, and the backrest frame assembly 100 are all hinged to the same hinge point B. This allows the armrest frames 700 to adjust synchronously with the angle of the seat surface and backrest, maintaining the user's arms in a natural position and improving comfort and stability during massage. The end of the seat base 300 is also provided with an outer front sealing plate 310. The outer front sealing plate 310 not only enhances the overall aesthetics of the massage chair frame but also serves to prevent dust and dirt from entering the interior of the chair frame, protecting the internal mechanical structure from damage, and also facilitating cleaning and maintenance by the user. The base frame 300 is also equipped with casters 330, which enable the massage chair frame to be easily moved and transported, improving the convenience of use.

[0056] like Figure 5As shown, the backrest frame assembly 100 includes a backrest frame body 110, a U-shaped bracket 120, and a reinforcing rod 130. The U-shaped bracket 120 is fixed to the backrest frame body 110. The two ends of the reinforcing rod 130 are fixedly connected to the backrest frame body 110 and the U-shaped bracket 120, respectively. Backrest pivots 140 are provided at both ends of the U-shaped bracket 120. Pivot supports 340 are provided on both sides of the seat base 300, and the backrest pivots 140 are mounted on their respective pivot supports 340. The combined design of the U-shaped bracket 120 and the reinforcing rod 130 enhances the structural strength and stability of the backrest frame, enabling it to withstand greater pressure and impact.

[0057] like Figure 6 As shown, a connecting rod seat 320 is provided on the base frame 300, and the first connecting rod 401 is hinged to the connecting rod seat 320. The design of the connecting rod seat 320 provides a stable hinge point C for the first connecting rod 401, making the connecting rod more stable and reliable when transmitting power.

[0058] like Figure 7 As shown, the seat assembly 200 includes a seat body 210, a seat frame 220, and a seat rotating lug 230. The seat frame 220 includes an upper seat mounting frame 221 and a lower strut hinge frame 222. The seat body 210 is mounted on the seat mounting frame 221. The seat rotating lug 230 is located at one end of the seat mounting frame 221. The seat assembly 200 is hinged to the seat base frame 300 through the seat rotating lug 230. The seat mounting frame 221 serves as the supporting structure for the seat body 210, ensuring the flatness and load-bearing capacity of the seat. The lower strut hinge frame 222 connects to the electric strut, enabling electric adjustment of the seat angle. The seat rotation lug 230, acting as the hinge between the seat assembly 200 and the seat base frame 300, directly affects the coordinated adjustment of the seat and backrest. By placing the seat rotation lug 230 at one end of the seat mounting frame 221 and hinged to the seat base frame 300, the seat assembly 200 can rotate smoothly around that point, thus synchronizing with the rotation of the backrest frame assembly 100. The front end of the seat assembly 200 also features an arc-shaped inner front sealing plate 670.

[0059] like Figure 8 - Figure 11As shown, the massage chair frame also includes a leg support assembly 600 for supporting the user's legs. The leg support assembly 600 includes a leg support plate, a second electric support rod 610, a leg support rod hinge seat 620, a first connecting plate 630, a second connecting plate 640, and a support wheel bracket 650. The leg support rod hinge seat 620 is fixed to the seat mounting frame 221. The leg support rod hinge seat 620 includes two hinge lugs. One end of the first connecting plate 630 and the second connecting plate 640 are respectively hinged to the leg support rod. The two hinged lugs of the connecting seat 620 are hinged together. The other ends of the first connecting plate 630 and the second connecting plate 640 are respectively hinged to the two ends of the support wheel bracket 650, so that the support wheel bracket 650 can move with the movement of the connecting plates, thereby adjusting the position and angle of the leg support. The cylinder of the second electric strut 610 is hinged to the strut hinge frame 222, and the drive shaft of the second electric strut 610 is hinged to the middle of the first connecting plate 630. The support wheel bracket 650 is also provided with a support wheel 660. One end of the leg support plate is hinged to the end of the seat mounting frame 221 away from the seat rotating lug 230, so that the leg support plate can be angled relative to the seat surface. At the same time, the bottom of the leg support plate is supported by the support wheel 660 to ensure stability during lifting and lowering, and the support wheel 660 reduces the frictional resistance when the leg support plate moves (the structure of the leg support plate is not shown in the accompanying drawings). When the second electric strut 610 is working, the extension and retraction of its drive shaft will push the first connecting plate 630, and then through the hinge relationship between the first connecting plate 630 and the second connecting plate 640 and the support wheel bracket 650, drive the entire support wheel bracket 650 and the leg support plate structure to rise and fall.

[0060] The hinge position of the cylinder of the second electric support rod 610 directly affects the coordinated adjustment effect between the leg and the seat. The drive shaft of the first electric support rod 500 is also hinged to the support rod hinge frame 222. The cylinder of the second electric support rod 610 and the drive shaft of the first electric support rod 500 are hinged on the same support rod hinge frame 222. When the first electric support rod 500 extends or retracts, it not only drives the seat assembly 200 to adjust its angle, but also transmits power to the leg support assembly 600 through the support rod hinge frame 222, allowing it to rotate synchronously with the rotation of the seat assembly 200. When the seat assembly 200 and the leg support assembly 600 rotate to a suitable angle, the height of the leg support plate can be adjusted independently by the second electric support rod 610. When the second electric support rod 610 extends, it pushes the first connecting plate 630 to rotate, realizing the leg lifting action; conversely, when the second electric support rod 610 retracts, it realizes the leg retraction action.

[0061] The working method of the massage chair frame is as follows:

[0062] When the user starts the massage chair frame to adjust the angle, firstly, the first electric support rod 500 begins to operate. Its cylinder is securely hinged to the seat base 300, while the drive shaft is connected to the support rod hinge frame 222 of the seat assembly 200. As the drive shaft of the first electric support rod 500 extends, an outward thrust is applied to the seat assembly 200. This thrust causes the seat assembly 200 to begin rotating around the hinge point A with the seat base 300, thereby achieving seat angle adjustment. Simultaneously, due to the linkage effect of the connecting rod assembly 400... The first link 401 serves as a supporting base and is securely hinged to the link seat 320 of the seat base 300. As the seat assembly 200 rotates, the connected second link 402 also begins to move. Therefore, when the second link 402 moves, it pulls the third link 403 to move together. Since the other end of the third link 403 is hinged to the backrest frame assembly 100, it drives the backrest frame assembly 100 to rotate around the same hinge point A with the seat base 300. In this way, the backrest frame assembly 100 can closely follow the angle changes of the seat assembly 200, realizing coordinated adjustment of the seat and backrest angles.

[0063] While the seat and backrest angles are being adjusted, the leg support assembly 600 is also adjusted simultaneously. Since the cylinder of the second electric strut 610 and the drive shaft of the first electric strut 500 are hinged together on the strut hinge frame 222, when the first electric strut 500 drives the seat assembly 200 to rotate, its power is also transmitted to the leg support assembly 600 through the strut hinge frame 222, allowing it to rotate synchronously with the seat assembly 200. Once the seat assembly 200 and leg support assembly 600 have rotated to the appropriate angle, the second electric strut 610 begins to work independently, adjusting the height of the leg support plate. The extension and retraction of its drive shaft pushes the first connecting plate 630 to rotate, and then, through the hinged relationship between the first connecting plate 630, the second connecting plate 640, and the support wheel bracket 650, drives the entire support wheel bracket 650 and leg support plate structure to rise and fall. When the second electric support rod 610 extends, it pushes the first connecting plate 630 to achieve the leg-raising action; conversely, when the second electric support rod 610 retracts, it achieves the leg-lowering action.

[0064] In addition, the armrest 700 will also adjust synchronously with the changes in the angle of the seat and backrest, so that the armrest 700 can keep the user's arms in a natural position, improving the comfort and stability during massage.

[0065] Example 2:

[0066] like Figure 12 - Figure 15 As shown, unlike Embodiment 1, in this embodiment, the cylinder of the first electric support rod 500 is hinged to the seat base 300, and the drive shaft of the first electric support rod 500 is hinged to the backrest frame assembly 100.

[0067] One end of the first electric support rod 500 is hinged to hinge point E on the seat base frame 300, and the other end is hinged to hinge point D on the backrest frame 100. As the drive shaft of the first electric support rod 500 extends, an inward pulling force is applied to the backrest frame assembly 100. This pulling force causes the backrest frame assembly 100 to begin rotating around hinge point A with the seat base frame 300, thereby achieving backrest angle adjustment. At the same time, due to the linkage effect of the linkage assembly 400, the first link 401, as a support base, is firmly hinged at one end to the link seat 320 of the seat base frame 300. As the backrest frame 100 rotates, the third link 403 connected to it also begins to move. Therefore, when the third link 403 moves, it will pull the second link 402 to move together. Since the other end of the second link 402 is hinged to the seat surface assembly 200, it will drive the seat surface assembly 200 to rotate around the same hinge point A with the seat base frame 300. In this way, the seat assembly 200 can closely follow the angle changes of the backrest frame assembly 100, achieving coordinated adjustment of the backrest and seat angles.

[0068] This invention is not only simple and reliable in structure and low in manufacturing cost, but also helps users obtain ideal massage effects and a comfortable massage experience.

[0069] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A massage chair frame with adjustable seat and backrest angles, characterized in that, The device includes a backrest frame assembly (100), a seat surface assembly (200), a seat base frame (300), a linkage assembly (400), and a first electric support rod (500). The backrest frame assembly (100) and the seat surface assembly (200) are connected to the seat base frame (300) through the linkage assembly (400). The backrest frame assembly (100) and the seat surface assembly (200) are hinged to the same hinge point A on the seat base frame (300). The extension and retraction of the first electric support rod (500) can drive the seat surface assembly (200) and the backrest frame assembly (100) to rotate synchronously around the hinge point A connected to the seat surface assembly (200).

2. The massage chair frame with coordinated adjustment of seat and backrest angles according to claim 1, characterized in that, The cylinder of the first electric strut (500) is hinged to the seat base (300), and the drive shaft of the first electric strut (500) is hinged to the seat assembly (200) or the backrest assembly (100).

3. The massage chair frame with coordinated adjustment of seat and back angles according to claim 1, characterized in that, The linkage assembly (400) includes a first link (401), a second link (402), and a third link (403). One end of each of the first link (401), the second link (402), and the third link (403) is hinged together. The other end of the first link (401) is hinged to the seat base frame (300), the other end of the second link (402) is hinged to the seat surface assembly (200), and the other end of the third link (403) is hinged to the backrest frame assembly (100).

4. The massage chair frame with coordinated adjustment of seat and backrest angles according to any one of claims 1-3, characterized in that, The seat assembly (200) includes a seat body (210), a seat frame (220), and a seat rotating lug (230). The seat frame (220) includes an upper seat mounting frame (221) and a lower strut hinge frame (222). The seat body (210) is mounted on the seat mounting frame (221). The seat rotating lug (230) is located at one end of the seat mounting frame (221). The seat assembly (200) is hinged to the seat base frame (300) through the seat rotating lug (230).

5. The massage chair frame with coordinated adjustment of seat and back angles according to claim 4, characterized in that, It also includes a leg support assembly (600) for supporting the user's legs. The leg support assembly (600) includes a second electric strut (610), a leg support hinge seat (620), a first connecting plate (630), a second connecting plate (640), and a support wheel bracket (650). The leg support hinge seat (620) is fixed to the seat mounting frame (221). The leg support hinge seat (620) includes two hinge lugs. The first connecting plate (630) and the second connecting plate (640) One end of the first connecting plate (630) is hinged to the two hinge lugs of the leg support hinge seat (620), the other ends of the first connecting plate (630) and the second connecting plate (640) are hinged to the two ends of the support wheel bracket (650), the cylinder of the second electric support rod (610) is hinged to the support rod hinge frame (222), the drive shaft of the second electric support rod (610) is hinged to the middle of the first connecting plate (630), and the support wheel bracket (650) is also provided with a support wheel (660).

6. The massage chair frame with coordinated adjustment of seat and back angles according to claim 5, characterized in that, The front end of the seat assembly (200) is also provided with an arc-shaped inner front sealing plate (670).

7. The massage chair frame with coordinated adjustment of seat and backrest angles according to claim 3, characterized in that, The seat base (300) is also provided with armrests (700) on both sides. The armrests (700), the backrest assembly (100) and the seat assembly (200) are all hinged to the same hinge point A on the seat base (300). The armrests (700), the third link (403) and the backrest assembly (100) are all hinged to the same hinge point B.

8. The massage chair frame with coordinated adjustment of seat and back angles according to claim 1, characterized in that, The backrest frame assembly (100) includes a backrest frame body (110), a U-shaped bracket (120), and a reinforcing rod (130). The U-shaped bracket (120) is fixed on the backrest frame body (110). The two ends of the reinforcing rod (130) are fixedly connected to the backrest frame body (110) and the U-shaped bracket (120), respectively. The two ends of the U-shaped bracket (120) are provided with backrest pivots (140). The two sides of the seat base frame (300) are provided with pivot supports (340). The backrest pivots (140) are installed on their respective pivot supports (340).

9. The massage chair frame with coordinated adjustment of seat and back angles according to claim 3, characterized in that, The base frame (300) is provided with a connecting rod seat (320), and the first connecting rod (401) is hinged to the connecting rod seat (320).

10. The massage chair frame with coordinated adjustment of seat and back angles according to claim 1, characterized in that, The end of the base frame (300) is also provided with an outer front sealing plate (310).

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