Anti-tip seat frame and multi-attitude seat

Abstract

The application discloses a front-tipping-preventing seat frame and a multi-posture seat. The front-tipping-preventing seat frame comprises a base, a bottom of the base defining a support surface; a folding mechanism movably mounted on the base, the folding mechanism being a multi-link mechanism and one link serving as a mounting rod; and a front-tipping-preventing support leg fixedly connected to the mounting rod. When the seat frame is in a first posture, the folding mechanism provides a containing space, and the front-tipping-preventing support leg is located in the containing space. During the process that the seat frame enters a second posture from the first posture, the front-tipping-preventing support leg moves with the fixed rod to project out of the containing space forward. When the seat frame is in the second posture, the front-tipping-preventing support leg abuts against the support surface, and the abutting position is located on the front side of the base. The front-tipping-preventing support leg is driven by the space state of the link, so that the seat frame has the advantages of simple and compact overall structure, easy production and assembly, good economy, excellent use experience and the like.

Description

Technical Field

[0001] This application relates to the field of furniture, and in particular to an anti-tipping seat frame and a multi-position seat. Background Technology

[0002] With the improvement of domestic productivity and the development of the social economy, people's living standards are getting higher and higher, and their requirements for furniture are also getting higher and higher. Sofas, rocking chairs, and other chairs are ubiquitous. Some sofas not only have extendable footrests, but also adjustable backrests. Currently, these types of chairs generally provide three usage postures: sitting, relaxing, and reclining. These postures allow users to sit down, relax their legs, and lie down to rest, respectively. Multi-posture chairs provide the seat surface through the seat frame. When a user intends to lie down, the extension of the footrest relative to the seat frame allows the multi-posture chair to switch from a sitting to a relaxing posture; furthermore, the reclining of the backrest relative to the seat frame allows the multi-posture chair to switch from a relaxing to a reclining posture. After resting, the multi-posture chair in the reclining position first returns the backrest to an upright position to restore the relaxing posture, and then retracts the footrest to return from the relaxing posture to a sitting posture so that the user can get up and leave the multi-posture chair.

[0003] To ensure adequate leg support and extension for users in relaxed or reclining positions, footrests typically extend a considerable distance forward, shifting the overall center of gravity of the seat frame forward. When a occupant adjusts their posture or stands up, the center of gravity can easily shift forward out of the seat frame's support range, causing the entire seat frame to tilt forward, affecting the user experience and creating a safety hazard.

[0004] Existing technologies use anti-tipping supports to extend the support range of the seat frame and overcome the aforementioned problems. However, in multi-position seats, the anti-tipping support needs to adjust its position according to the different postures of the seat frame, requiring a corresponding follow-up mechanism. This makes the structure relatively complex, negatively impacting production costs and assembly difficulty, and thus leaving room for improvement. Utility Model Content

[0005] To address the aforementioned technical issues, this application discloses an anti-tipping seat frame that can achieve the anti-tipping function while also considering the production cost and assembly difficulty of the seat frame. The overall structure of the seat frame is simple and compact, and it has the advantages of good economy and excellent user experience.

[0006] One embodiment of this application discloses an anti-tipping seat frame, the seat frame employing a deformable structure to switch between a first posture and a second posture, the seat frame having a relative fore-and-aft direction and comprising:

[0007] A base, the bottom of which defines a supporting surface;

[0008] A folding mechanism is movably mounted on the base, and the folding mechanism is a multi-link mechanism with one link serving as a mounting rod.

[0009] Anti-tipping support feet are fixedly connected to the mounting rod;

[0010] When the seat frame is in the first posture, the folding mechanism provides a storage space, and the anti-tipping support leg is located within the storage space;

[0011] As the seat frame moves from the first posture to the second posture, the anti-tipping support leg moves with the fixed rod to extend forward out of the receiving space;

[0012] When the seat frame is in the second posture, the anti-tipping support foot abuts against the support surface and the abutment position is located on the front side of the base.

[0013] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0014] In one embodiment, the folding mechanism includes:

[0015] The seating assembly is movably connected to the base via a first linkage assembly, wherein one of the linkages in the first linkage assembly serves as the mounting rod.

[0016] The leg assembly is movably connected to the seating assembly;

[0017] The backrest assembly is movably connected to the seating assembly via a second linkage assembly;

[0018] When the seat frame is in the first posture, the leg assembly and the backrest assembly are close together to the seat assembly to provide a sitting posture;

[0019] In the second posture, the leg assembly and the backrest assembly are positioned away from the seating assembly to provide a reclining position.

[0020] In one embodiment, the seating assembly includes:

[0021] The support rod is used to support the passenger. During the transition of the seat frame from the first posture to the second posture, the support rod moves forward relative to the base.

[0022] The first link assembly is hinged between the support rod and the base.

[0023] In one embodiment, the first link assembly includes:

[0024] The front support and the rear support are respectively hinged at both ends to the support rod and the base;

[0025] Multiple linkage rods are hinged between the supporting rod, the front support member, and the rear support member to constrain the movement relationship of each rod, and one of the multiple linkage rods serves as the mounting rod.

[0026] In one embodiment, the multiple linkages specifically include:

[0027] The first linkage rod is hinged to the supporting rod in the middle;

[0028] The second linkage rod is hinged at one end to the first linkage rod and at the other end to the leg assembly;

[0029] The third linkage rod has one end hinged to the first linkage rod at a non-axial position, and the other end hinged to the front support member;

[0030] The third linkage rod serves as the mounting rod.

[0031] In one embodiment, the seat frame is in the first posture, and the third linkage extends in the front-rear direction to drive the anti-tipping support foot away from the support surface;

[0032] When the seat frame is in the second posture, the third linkage rod intersects in the front-rear direction to drive the anti-tipping support foot to abut against the support surface.

[0033] In one embodiment, the anti-tipping support foot includes:

[0034] The connecting part has a fixed end that is connected to the mounting rod at one end and a stop end that extends away from the fixed end at the other end.

[0035] A stopper is installed on the stopper end and is used to abut against the support surface.

[0036] In one embodiment, the mounting rod is provided with an adapter structure for connecting the fixed end, the adapter structure being disposed at the end of the mounting rod near the base in the second posture;

[0037] The adapter structure provides multiple constraint positions to limit the three-dimensional spatial position of the mounting rod and the anti-tipping support foot.

[0038] In one embodiment, the seat frame further includes a third posture between the first posture and the second posture;

[0039] During the process of the seat frame moving from the first posture to the third posture, the leg assembly moves away from the seat assembly, and the backrest assembly maintains a preset state relative to the seat assembly.

[0040] As the seat frame moves from the third posture to the second posture, the backrest assembly moves away from the seating assembly, and the leg assembly maintains a preset state relative to the seating assembly.

[0041] In one embodiment of this application, a multi-posture seat is also disclosed, including the anti-tipping seat frame described in the above technical solution and a drive mechanism for driving the seat frame to change its posture. The drive mechanism is coupled to the base through a first control point and to the seat frame through a second control point. During the process of the seat frame moving from the first posture to the second posture, the first control point and the second control point move relative to each other.

[0042] The technical solution disclosed in this application fixes the anti-tipping support foot to one of the links of the folding mechanism. The state of the anti-tipping support foot changes by controlling the spatial state of the corresponding link under different postures of the seat frame, thus avoiding the need for a follow-up mechanism in existing technologies. The seat frame in this application has advantages such as a simple and compact overall structure, ease of production and assembly, good economy, and excellent user experience.

[0043] The specific beneficial technical effects will be further explained in the specific implementation methods in conjunction with specific structures or steps. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the anti-tipping seat frame structure in one embodiment of this application (first posture);

[0045] Figure 2 for Figure 1 A side view of the anti-tipping seat frame;

[0046] Figure 3 for Figure 1 A schematic diagram of the third posture structure of the anti-tipping seat frame in the middle;

[0047] Figure 4 for Figure 3 A side view of the anti-tipping seat frame;

[0048] Figure 5 for Figure 1 A schematic diagram of the second posture structure of the anti-tipping seat frame in the middle;

[0049] Figure 6 for Figure 5 A side view of the anti-tipping seat frame;

[0050] Figure 7This is a schematic diagram showing the assembly of the various components of the seat frame in the second posture.

[0051] Figure 8 This is a schematic diagram of the mounting rod and anti-tipping support feet in one embodiment;

[0052] Figure 9 This is a schematic diagram of the anti-tipping seat frame structure (second posture) in another embodiment of this application;

[0053] Figure 10 This is a schematic diagram of the connection points of each member in one embodiment of this application.

[0054] The annotations in the figure are explained as follows:

[0055] 100. Base;

[0056] 200. Folding mechanism; 210. Seating assembly; 211. First linkage assembly; 2111. Front support; 2112. Rear support; 2113. First linkage rod; 2114. Second linkage rod; 2115. Third linkage rod; 2116. Fourth linkage rod; 2117. Fifth linkage rod; 2118. Sixth linkage rod; 212. Support rod; 2121. Mounting base; 220. Leg assembly; 230. Backrest assembly; 231. Second linkage assembly;

[0057] 300. Anti-tipping support foot; 310. Connecting part; 311. Fixed end; 312. Abutting end; 313. Bending end; 314. Clearance notch; 320. Abutting component; 330. Positioning hole;

[0058] 400. Drive mechanism; 401. First control point; 402. Second control point;

[0059] 900. Forward and backward direction; 910. Containment space. Detailed Implementation

[0060] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0063] Reference Appendix Figure 1 To be continued Figure 2 As shown, this application discloses an anti-tipping seat frame, which includes a base 100 defining a support surface; a folding mechanism 200 movably mounted on the base 100; and an anti-tipping support leg 300 fixed to one component of the folding mechanism 200. Compared to existing technologies where the anti-tipping support leg 300 requires a follow-up mechanism, the solution in this application uses the spatial state of corresponding components of the seat frame in different postures to drive the state change of the anti-tipping support leg 300. Specifically, the seat frame adopts a deformable structure to switch between a first posture (see attached diagram). Figure 1 and attached Figure 2 (as shown) and second posture (see attached) Figure 5 and attached Figure 6 As shown), the folding mechanism 200 is a multi-link mechanism, with one link serving as a mounting rod for securing the anti-tipping support leg 300. The seat frame has a relative fore-and-aft angle of 90°, and in each posture, the components engage as follows:

[0064] With the seat frame in its first position, the folding mechanism 200 provides a storage space 910, and the anti-tipping support leg 300 is located within the storage space 910.

[0065] As the seat frame moves from the first posture to the second posture, the anti-tipping support leg 300 moves with the fixed rod to extend forward into the receiving space 910.

[0066] When the seat frame is in the second position, the anti-tipping support foot 300 abuts against the support surface and the abutment position is located in front of the base 100. The anti-tipping support foot 300 works with the base 100 to expand the support range, ensuring that the center of gravity of the passenger and the overall seat frame is always within the support range, so as to achieve the technical effect of preventing forward tipping.

[0067] Therefore, the effectiveness of the anti-tipping support 300 is directly related to the specific posture of the components in the folding mechanism 200. The multiple links of the folding mechanism 200 cooperate with each other to achieve spatial posture switching. The multiple links of the folding mechanism 200 can be grouped according to different functions, as shown in the attached diagram. Figure 3 and attached Figure 4 In the illustrated embodiment, the folding mechanism 200 includes:

[0068] The seating assembly 210 is movably connected to the base 100 via the first link assembly 211, and one of the links in the first link assembly 211 serves as a mounting rod.

[0069] Leg assembly 220 is movably connected to seat assembly 210;

[0070] The backrest assembly 230 is movably connected to the seat assembly 210 via the second link assembly 231;

[0071] The components can move relative to each other to achieve posture changes of the seat frame. Specifically, in the first posture, the leg assembly 220 and the backrest assembly 230 are brought closer together to the seat assembly 210 to provide a sitting posture;

[0072] With the seat frame in the second position, the leg assembly 220 and backrest assembly 230 are moved away from the seating assembly 210 to provide a reclining position.

[0073] In this embodiment, the receiving space 910 is a relatively enclosed space formed by the rods of the folding mechanism 200. Specifically, the receiving space 910 is the space enclosed by the seating assembly 210 and the base 100. When the leg assembly 220 approaches the seating assembly 210, the opening of the receiving space 910 facing the front is closed. The anti-tipping support foot 300 is blocked by the leg assembly 220, especially by the foot shelf of the leg assembly 220. The anti-tipping support foot 300 is located behind the foot shelf.

[0074] Furthermore, in one embodiment, the seat frame also includes a third posture between the first posture and the second posture (see attached diagram). Figure 3 and attached Figure 4 (as shown);

[0075] During the process of the seat frame moving from the first posture to the third posture, the leg assembly 220 moves away from the seat assembly 210, while the backrest assembly 230 maintains a preset state relative to the seat assembly 210.

[0076] During the process of the seat frame moving from the third posture to the second posture, the backrest assembly 230 moves away from the seating assembly 210, while the leg assembly 220 maintains a preset state relative to the seating assembly 210.

[0077] In this embodiment, the anti-tipping support leg 300 is fixed to one of the links of the first link assembly 211 of the seating assembly 210. Specifically, the seating assembly 210 includes the first link assembly 211 mentioned above and a support rod 212, which is used to support the occupant. For example, in one embodiment, the support rod 212 is provided with a mounting seat 2121 for mounting a frame. The frame is equipped with cushioning material and a covering element covering the cushioning material. The frame, cushioning material, and covering element are used to form a sofa structure for actual seating. In different postures of the seat frame, the seating assembly 210 itself will also move relative to the base 100, see Appendix Figure 1 To be continued Figure 6 As shown, during the transition from the first posture to the second posture of the seat frame, the support rod 212 moves forward relative to the base 100. In an embodiment with a third posture, the movement of the support rod 212 can be broken down as follows:

[0078] During the transition of the seat frame from the first posture to the third posture, the support rod 212 moves forward relative to the base 100 while moving downward toward the base 100.

[0079] During the transition from the third posture to the second posture, the support rod 212 moves upward away from the base 100 while simultaneously moving forward relative to the base 100.

[0080] The specific movement of the support rod 212 is constrained by the first link assembly 211. The first link assembly 211 is hinged between the support rod 212 and the base 100. Specifically, the first link assembly 211 includes:

[0081] The front support member 2111 and the rear support member 2112 are respectively hinged to the support rod 212 and the base 100 at both ends;

[0082] Multiple linkage rods are hinged between the support rod 212, the front support member 2111, and the rear support member 2112 to constrain the movement relationship of each rod. One of the linkage rods serves as a mounting rod. The mounting rod must meet certain motion posture conditions. For example, in the first posture, the linkage rod extends in the front-rear direction 90° to drive the anti-tipping support leg 300 away from the support surface; in the second posture, the linkage rod intersects in the front-rear direction 90° to drive the anti-tipping support leg 300 against the support surface. (See attached reference.) Figure 7 In the illustrated embodiment, the multiple linkages specifically include:

[0083] The first linkage rod 2113 is hinged to the support rod 212 in the middle;

[0084] The second linkage rod 2114 is hinged at one end to the first linkage rod 2113 and at the other end to the leg assembly 220;

[0085] The third linkage 2115 has one end hinged to the first linkage 2113 at a non-axial position relative to the second linkage 2114, and the other end hinged to the front support member 2111.

[0086] In this embodiment, the third linkage 2115 satisfies the motion posture conditions mentioned above, therefore the third linkage 2115 serves as the mounting rod. In other embodiments, other linkages that satisfy the motion posture conditions mentioned above can also be used as mounting rods. For example, see attached... Figure 7 The fourth linkage 2116 shown can also satisfy the motion posture conditions mentioned above. Therefore, in other embodiments, the fourth linkage 2116 is included among the multiple linkages. One end of the fourth linkage 2116 is hinged to the support rod 212, and the other end is hinged to the front support member 2111. The fourth linkage 2116 serves as a mounting rod.

[0087] The anti-tipping support leg 300 can be either a one-piece structure or a separate structure. (See attached reference.) Figure 8 In the illustrated embodiment, the anti-tipping support leg 300 includes a separable connecting portion 310 and abutment member 320. The abutment member 320 abuts against the supporting surface and can be adjusted to meet different needs in different scenarios. For example, see attached... Figure 8 As shown, the abutment 320 is a resilient buffer block that provides stable support against the support surface. For example, see attached... Figure 9 As shown, the abutment 320 is a roller that can rotate relative to the connecting part 310, so that it smoothly abuts against the support surface during the movement of the anti-tipping support leg 300. For the specific structure of the connecting part 310, please refer to the attached drawing. Figure 7 and attached Figure 8 As shown, one end of the connecting portion 310 is a fixed end 311 connected to the mounting rod, and the other end is an abutting end 312 extending away from the fixed end 311; the abutting member 320 is installed on the abutting end 312. The extension trend of the connecting portion 310 itself can be adjusted according to the relative positional relationship between the anti-tipping support leg 300 and the surrounding rods. For example, in one embodiment, the connecting portion 310 of the anti-tipping support leg 300 extends in a straight line. Another example is shown in the attached figure. Figure 8 As shown, the connecting portion 310 also has a bent end 313 in the middle. The fixed end 311 and the bent end 313 extend in a straight line in a first direction, and the abutting end 312 and the bent end 313 extend in a straight line in a second direction. The first and second directions intersect. The connecting portion 310 with the bend can better adapt to the structure of the seat frame and avoid related components. Furthermore, the connecting portion 310 can also be provided with a clearance notch 314 for avoiding other components (such as the base 100).

[0088] The anti-tipping support leg 300 and the mounting rod can be an integral structure for fixed connection, such as an integral structure obtained by molding, welding, or bonding. For ease of assembly, maintenance, and adaptability, the anti-tipping support leg 300 and the mounting rod can also be separate components for easy connection and separation. In one embodiment, the mounting rod is provided with an adapter structure for connecting the fixed end 311. The adapter structure is located at the end of the mounting rod near the base 100 in the second posture. The adapter structure provides multiple constraint positions to limit the three-dimensional spatial position of the mounting rod and the anti-tipping support leg 300. The adapter structure can have various specific configurations, such as including a positioning groove on the mounting rod, into which the anti-tipping support leg 300 is inserted and positioned; another example is... Figure 7 As shown, the adapter structure includes multiple positioning holes 330 with different axes and connecting parts that penetrate the positioning holes 330. The anti-tipping support foot 300 and the mounting rod are both plate parts that are close to each other. A stable connection is achieved through the cooperation of the connecting parts and the positioning holes 330.

[0089] In the actual product, the seat frame is a three-dimensional structure to change posture in three-dimensional space. The seat frame has two corresponding side frames and a crossbar positioned between them. During the various posture changes of the seat frame mentioned above, the corresponding movements of the two side frames are synchronized through the crossbar. The seat frame also includes rods not mentioned above to constrain the motion of each component. (See attached reference.) Figure 10In the illustrated embodiment, the hinge relationships of the components are configured as follows: the front support member 2111 is hinged to the base 100 via hinge point A, and its other end is hinged to the fourth linkage rod 2116 via hinge point C. The other end of the fourth linkage rod 2116 is connected to the support rod 212 via hinge point E. The rear side of the support rod 212 is connected to the fifth linkage rod 2117 via hinge point I. The fifth linkage rod 2117 is hinged to the rear support member 2112 via hinge point L, and the rear support member 2112 is hinged to the base 100 via hinge point K. The fifth linkage rod 2117 is provided with hinge points J and M, where hinge point J is used to link the backrest assembly, and hinge point M is used to link the sixth linkage rod 2118. The other end of the sixth linkage rod 2118 is hinged to the fourth linkage rod 2116 via hinge point D. The support rod 212 also has a hinge point G between hinge point E and hinge point I. The middle part of the first linkage rod 2113 is hinged to hinge point G. One end of the first linkage rod 2113 is hinged to the third linkage rod 2115 through hinge point F, and the other end is hinged to the second linkage rod 2114 through hinge point H. The other end of the third linkage rod 2115 is hinged to the front support member 2111 through hinge point B. The anti-tipping support foot 300 is connected to the third linkage rod 2115 between hinge points B and hinge point F. The above-mentioned rod configuration is exemplary and does not limit the configuration of the folding mechanism in this application. Those skilled in the art can adjust the above-mentioned rod configuration in combination with the prior art. For example, Chinese patent documents with publication numbers CN108851724A, CN113842000B, CN216494457U, and CN222675781U all disclose feasible seat frame rod configurations, which will not be repeated here.

[0090] In conjunction with the above, one embodiment of this application also discloses a multi-posture seat, including the anti-tipping seat frame described in the above technical solution and a drive mechanism 400 for driving the seat frame to change its posture. The drive mechanism 400 is coupled to the base 100 through a first control point 401 and to the seat frame through a second control point 402. The drive mechanism 400 has various configuration forms, as detailed below. Figure 1 To be continued Figure 6 An exemplary feasible implementation is provided. The drive mechanism 400 includes a motor fixed to the base, a slide rail, and a slider slidably mounted on the slider and controlled by the motor. The slider serves as a first control point 401, with a drive rod hinged to it. The other end of the drive rod is hinged to a second control point 402 on the seat frame. During the process of the seat frame moving from a first posture to a second posture, the first control point 401 and the second control point 402 move relative to each other. The movement process of the seat frame is described in detail above.

[0091] Similarly, for multi-posture seats not described in detail above, they can be implemented using existing technologies, and will not be elaborated further here.

[0092] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0093] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A seat frame designed to prevent forward tipping, characterized in that, The seat frame employs a deformable structure to switch between a first posture and a second posture, and the seat frame has a relative fore-and-aft direction and includes: A base, the bottom of which defines a supporting surface; A folding mechanism is movably mounted on the base. The folding mechanism is a multi-link mechanism, with one link serving as a mounting rod. Anti-tipping support feet are fixedly connected to the mounting rod; When the seat frame is in the first posture, the folding mechanism provides a storage space, and the anti-tipping support leg is located within the storage space; As the seat frame moves from the first posture to the second posture, the anti-tipping support leg moves with the fixed rod to extend forward out of the receiving space; When the seat frame is in the second posture, the anti-tipping support foot abuts against the support surface and the abutment position is located on the front side of the base.

2. The anti-tipping seat frame according to claim 1, characterized in that, The folding mechanism includes: The seating assembly is movably connected to the base via a first linkage assembly, wherein one of the linkages in the first linkage assembly serves as the mounting rod. The leg assembly is movably connected to the seating assembly; The backrest assembly is movably connected to the seating assembly via a second linkage assembly; When the seat frame is in the first posture, the leg assembly and the backrest assembly are close together to the seat assembly to provide a sitting posture; In the second posture, the leg assembly and the backrest assembly are positioned away from the seating assembly to provide a reclining position.

3. The anti-tipping seat frame according to claim 2, characterized in that, The seating assembly includes: The support rod is used to support the passenger. During the transition of the seat frame from the first posture to the second posture, the support rod moves forward relative to the base. The first link assembly is hinged between the support rod and the base.

4. The anti-tipping seat frame according to claim 3, characterized in that, The first link assembly includes: The front support and the rear support are respectively hinged at both ends to the support rod and the base; Multiple linkage rods are hinged between the supporting rod, the front support member, and the rear support member to constrain the movement relationship of each rod, and one of the multiple linkage rods serves as the mounting rod.

5. The anti-tipping seat frame according to claim 4, characterized in that, The multiple linkages specifically include: The first linkage rod is hinged to the supporting rod at the middle; The second linkage rod is hinged at one end to the first linkage rod and at the other end to the leg assembly; The third linkage rod has one end hinged to the first linkage rod at a non-axial position, and the other end hinged to the front support member; The third linkage rod serves as the mounting rod.

6. The anti-tipping seat frame according to claim 5, characterized in that, When the seat frame is in the first posture, the third linkage rod extends in the front-rear direction to drive the anti-tipping support foot away from the support surface; When the seat frame is in the second posture, the third linkage rod intersects in the front-rear direction to drive the anti-tipping support foot to abut against the support surface.

7. The anti-tipping seat frame according to claim 1, characterized in that, The anti-tipping support foot includes: The connecting part has a fixed end that is connected to the mounting rod at one end and a stop end that extends away from the fixed end at the other end. A stopper is installed on the stopper end and is used to abut against the support surface.

8. The anti-tipping seat frame according to claim 7, characterized in that, The mounting rod is provided with an adapter structure for connecting the fixed end, and the adapter structure is located at the end of the mounting rod near the base in the second posture; The adapter structure provides multiple constraint positions to limit the three-dimensional spatial position of the mounting rod and the anti-tipping support foot.

9. The anti-tipping seat frame according to claim 2, characterized in that, The seat frame also includes a third posture between the first posture and the second posture; During the process of the seat frame moving from the first posture to the third posture, the leg assembly moves away from the seat assembly, and the backrest assembly maintains a preset state relative to the seat assembly; As the seat frame moves from the third posture to the second posture, the backrest assembly moves away from the seating assembly, and the leg assembly maintains a preset state relative to the seating assembly.

10. A multi-posture seat, characterized in that, The invention includes an anti-tipping seat frame according to any one of claims 1 to 9 and a drive mechanism for driving the seat frame to change its posture, wherein the drive mechanism is coupled to the base through a first control point and to the seat frame through a second control point, and the first control point and the second control point move relative to each other as the seat frame moves from the first posture to the second posture.

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