Electric sofa frame body, posture locking mechanism thereof and electric sofa

Abstract

The utility model belongs to electric sofa technical field, concretely relates to a kind of electric sofa frame body and its posture locking mechanism, electric sofa, and the electric sofa frame body includes: base;Base;Frame body side plate, its lower side is hinged on the base by first, second support piece;Connecting rod assembly, including the first connecting rod hinged on the frame body side plate;Transmission rod, one end is hinged on the frame body side plate, the other end is hinged on the first connecting rod;Connecting rod, it is set in the inside of the frame body side plate, one end is hinged on frame body side plate, the other end is hinged on second support piece;The frame body side plate, connecting rod and transmission rod are opened with respectively corresponding sitting posture, TV posture and lying posture Multiple limit notches, and the connecting rod and frame body side plate are correspondingly provided with limit protrusion;When the frame body side plate is respectively in sitting posture, TV posture or lying posture, the limit protrusion is embedded in the limit notch of corresponding posture.

Description

[0001] This application is based on and claims priority to Chinese Patent Application No. 2025219832060, filed on September 15, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This utility model belongs to the field of electric sofa technology, and in particular relates to an electric sofa frame and its posture locking mechanism, and an electric sofa. Background Technology

[0003] Electric sofas are becoming increasingly popular due to their ability to easily adjust the angles of the backrest and footrest, providing users with various comfortable postures such as sitting, watching movies (TV posture), and lying down. Most existing electric sofas use motor-driven linkage mechanisms to achieve posture changes, and their posture locking mainly relies on the self-locking function of the motor transmission system (such as a worm gear mechanism) to maintain it.

[0004] However, this locking method relying on motor self-locking has inherent flaws: when the user is heavy, the heavy frame and load exert a huge impact and stress on the entire transmission system the instant the posture change is completed and the motor stops. At this time, small play in the gear meshing and linkage hinge points of the transmission mechanism is amplified under the load, causing the sofa frame to wobble or "sink" momentarily, only to be barely stabilized by the motor's self-locking force. This wobbling not only greatly affects the comfort and premium feel of use, making the product feel loose and unstable, but also accelerates the wear and tear on the transmission mechanism and motor over time due to repeated impacts, reducing the product's lifespan and reliability.

[0005] Therefore, how to solve the problem of momentary swaying that occurs after a shift in posture due to the heavy load on electric sofas is a technical problem that urgently needs to be solved by those skilled in the art.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0007] This disclosure provides at least one electric sofa frame and its posture locking mechanism, and an electric sofa.

[0008] In a first aspect, embodiments of this disclosure provide an electric sofa frame, comprising: Base; The side panels of the frame are hinged to the base by at least two support members on their lower sides; A linkage assembly, including a first linkage hinged to the side plate of the frame; The transmission rod has one end hinged to the side plate of the frame and the other end hinged to the first connecting rod; A connecting rod is provided on the inner side of the frame side plate, with one end hinged to the frame side plate and the other end hinged to the second support member. The frame side plate, connecting rod and transmission rod are provided with multiple limiting notches corresponding to sitting posture, TV posture and lying posture respectively, and the connecting rod and frame side plate are provided with corresponding limiting protrusions; When the linkage assembly is driven to extend to different degrees to bring the frame side plate into a sitting, TV, or lying position respectively, the limiting protrusion is embedded in the limiting notch of the corresponding position.

[0009] In one optional embodiment, the limiting notch and the limiting protrusion include: The first and second limiting notches and the first limiting protrusion correspond to the sitting posture; The third limiting notch and the second limiting protrusion correspond to the TV posture; The fourth limiting notch and the third limiting protrusion correspond to the lying position.

[0010] In one optional embodiment, the first limiting notch is formed on the upper edge of the transmission rod, the second limiting notch is a groove formed on the lower edge of the frame side plate, and the first limiting protrusion is provided on the outside of the connecting rod; When the sofa is in a seated position, the transmission rod moves towards the side panel of the frame so that the first and second limiting notches abut against the first limiting protrusion to form a seated locking.

[0011] In one optional embodiment, the third limiting notch (212) is a groove formed on the upper edge of the connecting rod, and the second limiting protrusion is provided on the inner side of the frame side plate; When the sofa is in the TV position, the transmission rod extends away from the side panel of the frame, and the second limiting protrusion is embedded in the third limiting notch to form a TV position lock.

[0012] In one optional embodiment, the fourth limiting notch is a groove formed at the lower edge of the connecting rod, and the third limiting protrusion is provided on the inner side of the frame side plate, and the third limiting protrusion is close to the hinge point between the connecting rod and the frame side plate. When the sofa is in a reclining position, the second support member drives the connecting rod to rotate around the hinge point, so that the third limiting protrusion is embedded in the fourth limiting notch to form a reclining lock.

[0013] In one optional implementation, the limiting notch is a V-shaped groove, an arc-shaped groove, or a U-shaped groove.

[0014] Secondly, embodiments of this disclosure also provide a posture locking mechanism for an electric sofa, comprising: The side panels of the frame are provided with a second limiting protrusion and a third limiting protrusion on their inner sides; A linkage assembly, including a first linkage hinged to the side plate of the frame; The transmission rod has one end hinged to the side plate of the frame and the other end hinged to the first connecting rod; A connecting rod is provided on the inner side of the frame side plate, and one end of the connecting rod is hinged to the frame side plate; The transmission rod has a first limiting notch at its upper edge; the frame side plate has a second limiting notch at its upper edge; and the connecting rod has a third and a fourth limiting notch at its upper and lower edges, respectively. When the sofa is switched to a sitting position, the first and second limiting notches abut against the first limiting protrusion to form a sitting position lock; When the sofa is switched to the TV position, the second limiting protrusion is embedded in the third limiting notch to form a TV position lock; When the sofa is switched to a reclining position, the third limiting protrusion is inserted into the fourth limiting notch to form a reclining position lock.

[0015] In one optional embodiment, the first limiting notch is formed on the upper edge of the transmission rod, the second limiting notch is a groove formed on the lower edge of the frame side plate, and the first limiting protrusion is provided on the outside of the connecting rod.

[0016] In one optional embodiment, the third limiting notch is a groove formed along the upper edge of the connecting rod, and the second limiting protrusion is disposed on the inner side of the frame side plate; and, The fourth limiting notch is a groove formed at the lower edge of the connecting rod, and the third limiting protrusion is located on the inner side of the frame side plate, and the third limiting protrusion is close to the hinge point between the connecting rod and the frame side plate.

[0017] Thirdly, this disclosure also provides an electric sofa, including the electric sofa frame described above.

[0018] The beneficial effect of this utility model is that the electric sofa frame provides solid physical support for the electric sofa in different postures through the rigid mechanical engagement of the limiting protrusion and the limiting notch, solving the problem of frame wobbling that exists in traditional electric sofas due to their reliance on motor self-locking. Even if the user is heavy, the frame can be locked immediately after the posture change is completed, without any sinking or shaking.

[0019] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and drawings.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific 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.

[0022] Figure 1 A side view of an electric sofa frame in a seated position, provided as an embodiment of this disclosure; Figure 2 A perspective view of an electric sofa frame in a seated position, provided as an embodiment of this disclosure; Figure 3 A side view of an electric sofa frame in a TV posture, provided as an embodiment of this disclosure; Figure 4 A perspective view of an electric sofa frame in a TV pose, provided in an embodiment of this disclosure. Figure 5 A side view of an electric sofa frame in a reclining position, provided as an embodiment of this disclosure; Figure 6 This is a perspective view of an electric sofa frame in a reclining position, provided as an embodiment of the present disclosure.

[0023] In the picture: 100. Base; 200. Frame side plate; 210. Connecting rod; 211. First limiting protrusion; 212. Third limiting notch; 213. Fourth limiting notch; 220. First support member; 230. Second support member; 240. Second limiting protrusion; 250. Third limiting protrusion; 260. Second limiting notch; 300. Linkage assembly; 310. Transmission rod; 311. First limiting notch; 320. First connecting rod. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments 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 protection scope of this utility model.

[0025] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0026] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0027] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0028] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0029] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0030] Research has revealed shortcomings in existing technologies: most current electric sofas use motor-driven linkage mechanisms to achieve posture changes, with posture locking primarily relying on the self-locking function of the motor transmission system (such as a worm gear mechanism). However, this self-locking method has inherent flaws: when the user is heavy, the heavy frame and load exert a significant impact and stress on the entire transmission system at the moment the posture change is complete and the motor stops. At this time, minute play in the gear meshing and linkage hinge gaps in the transmission mechanism is amplified under load, causing the sofa frame to momentarily sway or "sink," only to be barely stabilized by the motor's self-locking force. This swaying not only greatly affects comfort and the perceived high-end feel, making the product feel loose and unstable, but also accelerates wear on the transmission mechanism and motor over time due to repeated impacts, reducing the product's lifespan and reliability.

[0031] Based on the above research, this disclosure provides an electric sofa frame. By setting a limiting protrusion and a limiting notch, when the electric sofa enters the sitting, TV, and reclining positions, the limiting protrusion will be embedded in the limiting notch of the corresponding position to prevent the electric sofa from shaking at the moment of completing the posture switch.

[0032] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] See Figure 1 and Figure 2 This disclosure provides an electric sofa frame, including: a base 100, a frame side panel 200 disposed above the base 100, and a plurality of hinge holes disposed on the frame of the base 100. The frame side panel 200 is hinged to the base 100 via a first support member 220 and a second support member 230. A linkage assembly 300 includes a first link 320 hinged to the frame side panel 200. A transmission rod 310 has one end hinged to the frame side panel 200 and the other end hinged to the first link 320. When the frame side panel 200 and the linkage assembly 300 rotate relative to the base 100 around the various hinge points, the electric sofa can switch between different postures. The frame side panel 200, connecting rod 210, and transmission rod 310 are provided with multiple limiting notches corresponding to sitting, TV, and reclining postures, respectively, and the connecting rod 210 and frame side panel 200 are provided with corresponding limiting protrusions. When the connecting rod assembly 300 is driven to extend to different degrees to put the frame side panel 200 into sitting, TV, or reclining postures, the limiting protrusions are engaged with the limiting notches of the corresponding postures to lock the frame side panel 200 and prevent it from shaking. Even if the user is heavy, because the frame side panel 200 is locked immediately upon completion of the posture change, there will be no sinking or shaking, significantly improving the user comfort and high-end feel of the product.

[0036] See also Figure 1 In some embodiments, the limiting notch and limiting protrusion include: a first limiting notch 311, a second limiting notch 260, and a first limiting protrusion 211 corresponding to a sitting posture; a third limiting notch 212 and a second limiting protrusion 240 corresponding to a TV posture; and a fourth limiting notch 213 and a third limiting protrusion 250 corresponding to a lying posture.

[0037] See Figure 1 and Figure 2 In some embodiments, when the electric sofa is in a seated position, the linkage assembly 300 moves to the first position, and the transmission rod 310 moves towards the side panel 200 of the frame. At this time, the first limiting protrusion 211 is precisely clamped by the first limiting notch 311 and the second limiting notch 260. The first limiting notch 311 and the second limiting notch 260 cooperate to form a circumferential constraint on the first limiting protrusion 211, thereby firmly locking the sofa frame in the seated position and ensuring the stability of the user's seated posture.

[0038] See Figure 3 and Figure 4In some embodiments, when the electric sofa switches to the TV position, the linkage assembly 300 continues to drive the frame movement. The transmission rod 310 extends away from the side panel 200 of the frame, the first limiting protrusion 211 slides out from the first limiting notch 311 and the second limiting notch 260, and the second limiting protrusion 240 is embedded in the third limiting notch 212 to limit the frame sway. At this time, the sofa backrest angle increases, the footrest is raised, and the frame is locked in a TV position suitable for watching movies.

[0039] See Figure 5 and Figure 6 In some embodiments, when the electric sofa is switched to a reclining position, the transmission rod 310 continues to extend, and the connecting rod 210 rotates around the hinge point on the inner side of the frame side plate 200 so that the third limiting protrusion 250 is embedded in the fourth limiting notch 213, so that the sofa can maintain extremely high structural stability and safety in the fully reclining position and prevent shaking.

[0040] See Figure 1 and Figure 2 In some embodiments, the first limiting notch 311 is a groove directly formed on the upper edge of the transmission rod 310. When the sofa is in a seated position, the first limiting protrusion 211 fixed to the connecting rod 210 fits precisely into the first limiting notch 311 on the transmission rod 310. The above design utilizes the moving part (transmission rod 310) itself as a limiting structure to achieve a compact mechanical interlock in the seated position.

[0041] See Figure 3 and Figure 4 In some embodiments, the third limiting notch 212 is a groove formed on the upper edge of the connecting rod 210, and the second limiting protrusion 240 is disposed on the inner side of the frame side plate 200; when the sofa is in the TV posture state, the transmission rod 310 extends away from the frame side plate 200, and the second limiting protrusion 240 is embedded in the third limiting notch 212 to form TV posture locking.

[0042] See Figure 5 and Figure 6 In some embodiments, the fourth limiting notch 213 is a groove formed at the lower edge of the connecting rod 210, and the third limiting protrusion 250 is disposed on the inner side of the frame side plate 200, and the third limiting protrusion 250 is close to the hinge point between the connecting rod 210 and the frame side plate 200; when the sofa is in a reclining position, the second support member 230 drives the connecting rod 210 to rotate around the hinge point, so that the third limiting protrusion 250 is embedded in the fourth limiting notch 213 to form a reclining lock.

[0043] See also Figure 1 and Figure 2In some embodiments, the limiting notch is a V-shaped groove, an arc-shaped groove, or a U-shaped groove. When the limiting notch adopts a V-shaped groove design, the inclined structure of the V-shape has a good guiding and corrective effect on the embedding process of the limiting protrusion. Even with minor assembly errors or deformations, it can ensure that the limiting protrusion slides smoothly into the bottom of the groove. More importantly, the V-shaped structure can generate a certain self-locking effect. When subjected to lateral force, the limiting protrusion tends to be locked in the bottom of the groove, thereby greatly enhancing the stability of the locking and effectively suppressing shaking.

[0044] Optionally, when the limiting notch adopts an arc-shaped groove design, the arc surface and the cylindrical limiting protrusion have a very high degree of shape matching, and the two are in surface contact, resulting in uniform force distribution. This makes the movement of the limiting protrusion during the insertion and removal process very smooth and fluid, with low impact force, effectively reducing operating noise and wear on the limiting protrusion and the groove itself, and extending service life.

[0045] Optionally, when the limiting notch adopts a U-shaped groove design, the U-shaped groove combines the guiding properties of a V-shaped groove with the high load-bearing capacity of a square groove. Its flat bottom provides a stable support plane, with a large contact area with the limiting protrusion and low pressure, making it particularly suitable for working conditions with high load requirements (such as locking in a lying position), ensuring extremely high structural reliability and stability even under heavy loads.

[0046] See Figure 1 and Figure 2 Some embodiments also provide a posture locking mechanism for an electric sofa, including: a frame side plate 200, on the inner side of which a second limiting protrusion 240 and a third limiting protrusion 250 are provided; a linkage assembly 300, including a first link 320 hinged to the frame side plate 200; a transmission rod 31, one end of which is hinged to the frame side plate 200 and the other end of which is hinged to the first link 320; a connecting rod 210, disposed on the inner side of the frame side plate 200, and one end of the connecting rod 210 is hinged to the frame side plate 200; a first limiting notch 311 is provided on the upper edge of the transmission rod 310; The upper edge of the frame side panel 200 is provided with a second limiting notch 260, and the upper and lower edges of the connecting rod 210 are respectively provided with a third limiting notch 212 and a fourth limiting notch 213. When the sofa is switched to a sitting position, the first limiting notch 311 and the second limiting notch 260 abut against the first limiting protrusion 211 to form a sitting position lock. When the sofa is switched to a TV position, the second limiting protrusion 240 is embedded in the third limiting notch 212 to form a TV position lock. When the sofa is switched to a reclining position, the third limiting protrusion 250 is embedded in the fourth limiting notch 213 to form a reclining position lock.

[0047] See also Figure 1 and Figure 2In some embodiments, the first limiting notch 311 is formed on the upper edge of the transmission rod 310, the second limiting notch 260 is a groove formed on the lower edge of the frame side plate 200; and the first limiting protrusion 211 is provided on the outside of the connecting rod 210.

[0048] See Figure 3 and Figure 4 In some embodiments, the third limiting notch 212 is a groove formed on the upper edge of the connecting rod 210, and the second limiting protrusion 240 is disposed on the inner side of the frame side plate 200.

[0049] See Figure 5 and Figure 6 In some embodiments, the fourth limiting notch 21 is a groove formed at the lower edge of the connecting rod 210, and the third limiting protrusion 250 is disposed on the inner side of the frame side plate 200, and the third limiting protrusion 250 is close to the hinge point between the connecting rod 210 and the frame side plate 200.

[0050] Some embodiments also provide an electric sofa, including the electric sofa frame described in the above embodiments.

[0051] In summary, the frame of this electric sofa provides robust physical support for the sofa in different postures through the rigid mechanical engagement of the limiting protrusions and limiting notches, completely solving the frame wobbling problem of traditional electric sofas that rely on motor self-locking. Even for users with greater weight, the frame locks immediately upon changing posture, without any sinking or shaking, significantly improving the product's comfort and premium feel.

[0052] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0053] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0054] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature and another element or feature illustrated in the figures. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0055] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0056] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An electric sofa frame, characterized in that, include: Base (100); The frame side panel (200) is hinged to the base (100) on its lower side by a first support member (220) and a second support member (230); The linkage assembly (300) includes a first link (320) hinged to the frame side plate (200). The transmission rod (310) has one end hinged to the side plate (200) of the frame and the other end hinged to the first connecting rod (320); A connecting rod (210) is provided on the inner side of the frame side plate (200), with one end hinged to the frame side plate (200) and the other end hinged to the second support member (230). The frame side plate (200), connecting rod (210) and transmission rod (310) are provided with limiting notches corresponding to sitting posture, TV posture and lying posture respectively, and the connecting rod (210) and frame side plate (200) are provided with limiting protrusions respectively. When the linkage assembly (300) is driven to extend, so as to drive the frame side plate (200) to be in a sitting, TV or lying position respectively, the limiting protrusion is embedded in the limiting notch of the corresponding position.

2. The electric sofa frame as described in claim 1, characterized in that, The limiting notch and limiting protrusion include: The first limiting notch (311), the second limiting notch (260), and the first limiting protrusion (211) are corresponding to the sitting posture. The third limiting notch (212) and the second limiting protrusion (240) corresponding to the TV posture; and The fourth limiting notch (213) and the third limiting protrusion (250) correspond to the lying position.

3. The electric sofa frame as described in claim 2, characterized in that, The first limiting notch (311) is opened on the upper edge of the transmission rod (310), the second limiting notch (260) is opened on the lower edge of the frame side plate (200), and the first limiting protrusion (211) is provided on the outside of the connecting rod (210); When the sofa is in a sitting position, the transmission rod (310) moves toward the side plate (200) of the frame so that the first limiting notch (311) and the second limiting notch (260) close together to abut against the first limiting protrusion (211) to form a sitting position lock.

4. The electric sofa frame as described in claim 2, characterized in that, The third limiting notch (212) is opened on the upper edge of the connecting rod (210), and the second limiting protrusion (240) is located on the inner side of the frame side plate (200); When the sofa is in the TV position, the transmission rod (310) extends away from the side panel (200) of the frame, and the second limiting protrusion (240) is embedded in the third limiting notch (212) to form a TV position lock.

5. The electric sofa frame as described in claim 2, characterized in that, The fourth limiting notch (213) is opened at the lower edge of the connecting rod (210), and the third limiting protrusion (250) is located on the inner side of the frame side plate (200), and the third limiting protrusion (250) is close to the hinge point between the connecting rod (210) and the frame side plate (200). When the sofa is in a reclining position, the second support member (230) drives the connecting rod (210) to rotate around the hinge point, so that the third limiting protrusion (250) is embedded in the fourth limiting notch (213) to form a reclining lock.

6. The electric sofa frame as described in claim 1, characterized in that, The limiting notch is a V-shaped groove, an arc-shaped groove, or a U-shaped groove.

7. A posture locking mechanism for an electric sofa, characterized in that, include: The frame side plate (200) has a second limiting protrusion (240) and a third limiting protrusion (250) on its inner side; The linkage assembly (300) includes a first link (320) hinged to the frame side plate (200). The transmission rod (310) has one end hinged to the side plate (200) of the frame and the other end hinged to the first connecting rod (320); A connecting rod (210) is provided on the inner side of the frame side plate (200), and one end of the connecting rod (210) is hinged to the frame side plate (200); The transmission rod (310) has a first limiting notch (311) on its upper edge; the frame side plate (200) has a second limiting notch (260) on its upper edge; and the connecting rod (210) has a third limiting notch (212) and a fourth limiting notch (213) on its upper and lower edges, respectively. When the sofa is switched to a sitting position, the first limiting notch (311), the second limiting notch (260), and the first limiting protrusion (211) abut against each other to form a sitting position lock; When the sofa is switched to the TV position, the second limiting protrusion (240) is embedded in the third limiting notch (212) to form a TV position lock; When the sofa is switched to a reclining position, the third limiting protrusion (250) is inserted into the fourth limiting notch (213) to form a reclining position lock.

8. The posture locking mechanism of the electric sofa as described in claim 7, characterized in that, The first limiting notch (311) is opened on the upper edge of the transmission rod (310), the second limiting notch (260) is opened on the lower edge of the frame side plate (200); and the first limiting protrusion (211) is provided on the outside of the connecting rod (210); When the sofa is in a sitting position, the transmission rod (310) moves toward the side plate (200) of the frame so that the first limiting notch (311) and the second limiting notch (260) close together to abut against the first limiting protrusion (211) to form a sitting position lock.

9. The posture locking mechanism of the electric sofa as described in claim 7, characterized in that, The third limiting notch (212) is formed on the upper edge of the connecting rod (210), and the second limiting protrusion (240) is provided on the inner side of the frame side plate (200); and, The fourth limiting notch (213) is opened at the lower edge of the connecting rod (210), and the third limiting protrusion (250) is located on the inner side of the frame side plate (200), and the third limiting protrusion (250) is close to the hinge point between the connecting rod (210) and the frame side plate (200).

10. An electric sofa, comprising an electric sofa frame as described in any one of claims 1-6.

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