Multi-posture stretching device and seat

Abstract

The invention discloses a multi-posture stretching device and a seat, the multi-posture stretching device comprises a mounting base, a stretching assembly and a step locking assembly, and the stretching assembly and the step locking assembly are both arranged on the mounting base. The stretching assembly comprises a first linkage assembly and a second linkage assembly which are used for driving the footrest to move and driving the backrest to incline backwards and reset correspondingly, and the device can be driven to achieve adjustment of various postures. The multi-stage locking assembly is in transmission fit with the stretching assembly, multi-stage locking positioning can be achieved for the motion posture of the stretching assembly, the positions of the first linkage assembly and the second linkage assembly are fixed, the device is stably suspended at the needed comfortable angle, and the technical problems that an existing stretching device cannot achieve multi-posture graded locking positioning and is poor in posture keeping stability are solved.

Description

Technical Field

[0001] This invention relates to the field of seating technology, specifically to a multi-posture extension device and seating. Background Technology

[0002] While existing sofas, chairs, and other furniture are equipped with mechanical extension devices that can adjust postures such as extending the footrest and tilting the backrest, they generally cannot achieve stable and reliable tiered locking and positioning in multiple intermediate posture positions after adjustment. The devices can only maintain their state at the extreme positions of fully folded and fully extended, and cannot stably hover in the zero-gravity posture or multiple leisure and rest postures required by the user. During use, it is difficult for users to maintain the device at a comfortable support angle according to their own needs, and posture slippage and unstable support are prone to occur. This not only affects the user experience, but also fails to meet diverse and personalized posture support needs. Summary of the Invention

[0003] The embodiments of the present invention provide a multi-posture extension device and seat, which solves the technical problems of existing extension devices being unable to achieve multi-posture hierarchical locking and positioning and having poor posture stability.

[0004] To address the aforementioned problems, according to one aspect of this application, an embodiment of the present invention provides a multi-posture extension device, including a mounting base, an extension component, and a tiered locking component; both the extension component and the tiered locking component are disposed on the mounting base; the extension component includes a first linkage component and a second linkage component, the first linkage component being used to drive the footrest movement, and the second linkage component being used to drive the backrest to tilt and return to its original position; the tiered locking component cooperates with the extension component to achieve multi-level locking and positioning of the movement posture of the extension component.

[0005] In some embodiments, the multi-posture extension device further includes a footrest opening component; the footrest opening component is driven to cooperate with the first linkage component and the segmented locking component, and the footrest opening component is used to drive the footrest component to complete the unfolding or retracting action, and to provide driving power to the segmented locking component.

[0006] In some embodiments, the footrest opening assembly includes a handle, a drive shaft, a shaft connector, a footrest drive component, an arc-shaped connector, and a tension elastic element; the handle is connected to the drive shaft, the shaft connector is sleeved on the outside of the drive shaft, the footrest drive component and the arc-shaped connector are both fixedly connected to the shaft connector, and the tension elastic element is connected to the arc-shaped connector and the mounting base respectively.

[0007] In some embodiments, the segmented locking assembly includes a locking drive component, a drive transmission unit, a locking execution unit, a segmented gear plate, and a drive fixing component; the locking drive component is fixedly connected to a drive shaft, the drive transmission unit cooperates with the locking drive component, the drive fixing component provides rotational support for the drive transmission unit, and the locking execution unit, driven by the drive transmission unit, engages with the segmented gear plate to achieve multi-level locking.

[0008] In some embodiments, the drive transmission unit includes a first drive rod, a drive elastic element, a second drive rod, and a drive connecting rod; the first drive rod is connected to the second drive rod through the drive elastic element, the middle part of the drive connecting rod is rotatably connected to the drive fixing element, one end of the drive connecting rod is driven in conjunction with the second drive rod, and the other end is driven in conjunction with the locking execution unit.

[0009] In some embodiments, the locking actuation unit includes a locking pin and a positioning pin; the first drive rod is provided with a sliding pin, and the second drive rod is provided with a sliding groove that slides with the sliding pin; the locking pin is provided with a waist-shaped groove, and the positioning pin passes through the waist-shaped groove to limit the movement range of the locking pin; the locking pin is inserted into the dividing tooth plate.

[0010] In some embodiments, the extension assembly further includes an extension base, a seat frame assembly, a footrest assembly, and a backrest assembly; the extension base is a support frame for the extension assembly, and the seat frame assembly, the first linkage assembly, and the second linkage assembly are all assembled on the extension base; the footrest assembly is drivenly connected to the first linkage assembly, and the backrest assembly is drivenly connected to the second linkage assembly.

[0011] In some embodiments, the extension base includes two extension plates, a first connecting pipe, a second connecting pipe, a first crossbeam, and a second crossbeam; the first connecting pipe and the second connecting pipe are respectively connected to the lower parts of the two extension plates, the first crossbeam and the second crossbeam are respectively connected to the upper parts of the two extension plates, and the first crossbeam and the second crossbeam are fixedly engaged with the seat frame assembly.

[0012] In some embodiments, the first linkage component includes a first linkage rod, a support rod, a second linkage rod, and a footrest linkage rod; the first linkage rod, the support rod, the second linkage rod, and the footrest linkage rod are all rotatably connected to the seat frame assembly, and the end of the footrest linkage rod away from the seat frame assembly is drively connected to the footrest assembly.

[0013] In some embodiments, the second linkage component includes a first lifting link, a second lifting link, a first limiting bushing, and a second limiting bushing; one end of the first lifting link is rotatably connected to the support rod, and the other end is rotatably connected to the second lifting link; the second lifting link is fixedly connected to the backrest component; the first limiting bushing and the second limiting bushing are respectively used to limit the movement stroke and reset position of the second linkage component.

[0014] In some embodiments, the footrest assembly includes an extended footrest plate, a footrest bracket, a first leg link, a second leg link, a first footrest connector, a second footrest connector, a third limiting bushing, and a footrest elastic member; the extended footrest plate is rotatably connected to the footrest bracket, the first leg link and the second leg link are rotatably connected to the footrest bracket and the extension plate, respectively, the third limiting bushing is sleeved on the outside of the second footrest connector, and the footrest elastic member is used to provide a restoring force for the footrest assembly.

[0015] In some embodiments, the backrest assembly includes a backrest insert and a backrest support; one end of the backrest insert is rotatably connected to the seat frame assembly, and the other end is fixedly connected to the backrest support; the end of the backrest support away from the backrest insert is fixedly connected to a second lifting link.

[0016] In some embodiments, the extension assembly 1 further includes a reset elastic element, one end of which is connected to the seat frame assembly and the other end of which is connected to the extension base, for providing tension for the reset of the second linkage assembly.

[0017] According to another aspect of this application, an embodiment of the present invention provides a seat, including a seat body and the aforementioned multi-posture extension device, wherein the seat body is connected to the extension component.

[0018] Compared with the prior art, the multi-posture extension device of the present invention has the following advantages: The multi-posture extension device provided by the present invention includes a mounting base, an extension component, and a locking component; both the extension component and the locking component are disposed on the mounting base; the extension component includes a first linkage component and a second linkage component, the first linkage component is used to drive the footrest movement, and the second linkage component is used to drive the backrest to tilt and return to its original position; the locking component is in transmission cooperation with the extension component to achieve multi-level locking and positioning of the movement posture of the extension component.

[0019] In this invention, the mounting base provides a stable foundation for the entire device, preventing slippage caused by an unstable foundation during posture adjustment and maintenance. The first and second linkage components in the extension assembly are responsible for driving the footrest movement and the backrest tilt reset, respectively, enabling the device to achieve various posture adjustments. This breaks the limitation of existing devices that can only maintain their state at the extreme positions of fully retracted and fully extended, and can meet the user's adjustment needs for zero-gravity posture or multiple leisure and rest postures. The graded locking component works in conjunction with the extension assembly, and can achieve multi-level locking and positioning of the extension assembly's movement posture when the extension assembly drives the device to adjust to the intermediate posture. This fixes the positions of the first and second linkage components, allowing the device to be stably suspended at the user's desired comfortable support angle, effectively preventing posture slippage and unstable support. This solves the technical problem that existing extension devices cannot achieve multi-posture graded locking and positioning and have poor posture maintenance stability.

[0020] The seating provided by this invention is designed based on the above-mentioned multi-posture extension device. Its beneficial effects are described in the beneficial effects of the multi-posture extension device, and will not be repeated here.

[0021] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a multi-posture extension device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a multi-posture extension device from another angle, provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of a multi-posture extension device in a seated position, provided in an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the other side of a multi-posture extension device in a seated position, provided by an embodiment of the present invention. Figure 5 This is a schematic diagram of the structure of a multi-posture stretching device in a leisure posture, provided by an embodiment of the present invention. Figure 6This is a schematic diagram of the structure of a multi-posture stretching device in a leisure posture, provided by an embodiment of the present invention. Figure 7 This is a schematic diagram of the structure of a multi-posture extension device in a lying position according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the other side of a multi-posture extension device in a lying position, provided by an embodiment of the present invention; Figure 9 This is a schematic diagram of one side of a multi-posture extension device in a zero-gravity posture, provided by an embodiment of the present invention. Figure 10 This is a schematic diagram of the structure on the other side of a multi-posture extension device in a zero-gravity posture, provided by an embodiment of the present invention. Figure 11 This is a schematic diagram of the structure of a multi-posture extension device provided in an embodiment of the present invention, showing the cooperation between the segmented locking component and the foot rest opening component. Figure 12 This is a side view of the footrest opening component in a multi-posture extension device provided in an embodiment of the present invention when it is in the first state; Figure 13 This is a side view of the footrest opening component in a multi-posture extension device provided in an embodiment of the present invention when it is in the second state; Figure 14 This is a schematic diagram of the footrest opening component in a multi-posture extension device provided in an embodiment of the present invention; Figure 15 This is a schematic diagram of another angle of the footrest opening component in a multi-posture extension device provided in an embodiment of the present invention; Figure 16 This is a schematic diagram of the structure of a multi-posture extension device when the locking component and the footrest opening component are separated, according to an embodiment of the present invention. Figure 17 This is a schematic diagram of the structure of a multi-posture extension device provided in an embodiment of the present invention, showing the cooperation between the segmented locking component and the foot rest opening component. Figure 18 This is a schematic diagram of the structure of a multi-posture extension device provided in an embodiment of the present invention, showing the engagement of the segmented locking component and the footrest opening component from another angle. Figure label explanation: 1. Extension assembly; 11. First linkage assembly; 12. Second linkage assembly; 13. Extension base; 14. Seat frame assembly; 15. Footrest assembly; 16. Backrest assembly; 17. Reset elastic element; 111. First linkage rod; 112. Support rod; 113. Second linkage rod; 114. Footrest linkage rod; 121. First lifting link; 122. Second lifting link; 123. First limiting bushing; 124. Second limiting bushing; 131. Extension plate; 132. First connecting tube; 133. Second connecting tube; 134. First crossbeam; 151. Extended footrest plate; 152. Footrest bracket; 153. First leg link; 154. Second leg link; 155. First footrest connector; 156. Second footrest 1. Connecting component; 157. Third limiting bushing; 158. Footrest elastic component; 161. Backrest insert; 162. Backrest support component; 2. Separating locking assembly; 21. Locking drive component; 22. Drive transmission unit; 23. Locking execution unit; 24. Separating tooth plate; 25. Drive fixing component; 221. First drive rod; 222. Drive elastic component; 223. Second drive rod; 224. Drive connecting rod; 2211. Sliding pin; 2231. Slide groove; 231. Locking pin; 232. Positioning pin; 2311. Waist-shaped groove; 3. Footrest opening assembly; 31. Handle; 32. Drive shaft; 33. Shaft connector; 34. Footrest drive component; 35. Arc-shaped connector; 36. Tension elastic component; 4. Swing assembly. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0025] In the description of this invention, it should be clearly stated that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," "horizontal," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are merely for the convenience of describing this invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention.

[0026] In the description of this invention, it should be noted that, 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0028] Example 1 This embodiment provides a multi-posture extension device, such as Figures 1-18 As shown, it includes a mounting base, an extension component 1, and a locking component 2; both the extension component 1 and the locking component 2 are disposed on the mounting base; the extension component 1 includes a first linkage component 11 and a second linkage component 12, the first linkage component 11 is used to drive the footrest movement, and the second linkage component 12 is used to drive the backrest to tilt and return to its original position; the locking component 2 is in transmission cooperation with the extension component 1 and is used to achieve multi-level locking and positioning of the movement posture of the extension component 1.

[0029] The mounting base serves as the foundation of the entire multi-posture extension device, providing stable mounting support for the extension component 1 and the locking component 2. The extension component 1 is mounted in the central area of ​​the mounting base, with its bottom forming a solid connection to the mounting base, ensuring that the extension component 1 will not shift during movement. The locking component 2 is mounted on the side of the mounting base near the extension component 1, with its fixed end firmly connected to the mounting base and its movable end forming a transmission engagement with the corresponding part of the extension component 1. The first linkage component 11 and the second linkage component 12 in the extension component 1 are both integrated into the main structure of the extension component 1. They work independently yet collaboratively. The first linkage component 11 is mainly used to receive external driving force and convert it into the power for the footrest movement, realizing the extension and retraction of the footrest. The second linkage component 12 focuses on driving the backrest to tilt and return, meeting the user's needs for adjusting the backrest angle. The core function of the locking component 2 is to precisely control the movement posture of the extension component 1. Through the transmission engagement with the extension component 1, it locks the movement positions of the first linkage component 11 and the second linkage component 12, thereby achieving multi-posture positioning of the entire device.

[0030] When the device's posture needs to be adjusted, an external driving force acts on the extension component 1, causing the first linkage component 11 and the second linkage component 12 to move respectively. When the first linkage component 11 moves, it drives the footrest to move, and when the second linkage component 12 moves, it drives the backrest to tilt. During this process, the shift locking component 2 always maintains transmission synchronization with the extension component 1, sensing the movement posture of the extension component 1 in real time. When the extension component 1 drives the device to adjust to the user's desired posture, the shift locking component 2 immediately moves, forming a locking engagement with the extension component 1 to fix the position of the extension component 1, thereby fixing the movement positions of the first linkage component 11 and the second linkage component 12, thus maintaining the posture. When it is necessary to adjust to other postures, the shift locking component 2 releases the lock with the extension component 1, and the extension component 1 can drive the first linkage component 11 and the second linkage component 12 to move again until the new desired posture is reached. Then, the shift locking component 2 locks again, and so on, to achieve multi-posture adjustment and locking.

[0031] To address the technical problems of existing extension devices' inability to achieve multi-posture hierarchical locking and positioning, and poor posture stability, this embodiment effectively solves these problems with a multi-posture extension device. Specifically, the mounting base provides a stable foundation for the entire device, preventing slippage caused by instability during posture adjustment and maintenance. The first linkage component 11 and the second linkage component 12 in the extension assembly 1 are responsible for driving the footrest movement and the backrest tilt reset, respectively, enabling the device to achieve various posture adjustments. This breaks the limitation of existing devices that can only maintain the state at the extreme positions of fully retracted and fully extended, meeting the user's adjustment needs for zero-gravity posture or multiple leisure and rest postures. The graded locking component 2 works in conjunction with the extension assembly 1, enabling multi-level locking and positioning of the extension assembly 1's movement posture when the extension assembly 1 drives the device to adjust to the intermediate posture. This fixes the positions of the first linkage component 11 and the second linkage component 12, allowing the device to be stably suspended at the user's desired comfortable support angle, effectively preventing posture slippage and unstable support. This solves the technical defects of existing extension devices, improves the user experience, and meets diverse and personalized posture support needs.

[0032] In a specific embodiment, the multi-posture extension device further includes a footrest opening component 3; the footrest opening component 3 is in transmission cooperation with the first linkage component 11 and the segmented locking component 2, and the footrest opening component 3 is used to drive the footrest component to complete the unfolding or retracting action, and to provide driving power for the segmented locking component 2.

[0033] The multi-posture extension device also includes a footrest opening component 3, which simultaneously forms a transmission cooperation with the first linkage component 11 and the segmented locking component 2. It not only undertakes the function of driving the footrest component to complete the unfolding or retracting action, but also provides stable driving power for the segmented locking component 2, ensuring that the segmented locking component 2 can normally achieve multi-level locking positioning. When the user needs to adjust the footrest position, the footrest opening component 3 activates, transmitting power to the first linkage component 11 through transmission. The first linkage component 11 then drives the footrest component to unfold or retract, meeting the user's needs for different footrest positions. Simultaneously, the power generated by the footrest opening component 3 during its operation is transmitted to the shift locking component 2, driving it into operation. This allows the shift locking component 2 to respond in real time to changes in the posture of the extension component 1, locking the positions of the first linkage component 11 and the second linkage component 12. This ensures stable maintenance of the device in different postures, guaranteeing both the smoothness of the footrest unfolding and retracting actions and the reliability of the shift locking function. This collaborative mechanism between posture adjustment and locking positioning enhances the stability and convenience of the device, effectively solving the inconvenience caused by the disconnect between posture adjustment and locking in existing devices.

[0034] In a specific embodiment, such as Figures 11-14 As shown, the footrest opening assembly 3 includes a handle 31, a drive shaft 32, a shaft connector 33, a footrest drive component 34, an arc-shaped connector 35, and a tension elastic component 36. The handle 31 is connected to the drive shaft 32, the shaft connector 33 is sleeved on the outside of the drive shaft 32, the footrest drive component 34 and the arc-shaped connector 35 are both fixedly connected to the shaft connector 33, and the tension elastic component 36 is connected to the arc-shaped connector 35 and the mounting base respectively.

[0035] The handle 31 is connected to the drive shaft 32 and serves as a trigger for user operation. By rotating the handle 31, the user can drive the drive shaft 32 to rotate synchronously, providing initial power for the entire footrest opening assembly 3. The shaft connector 33 is sleeved on the outside of the drive shaft 32 and can rotate synchronously with the drive shaft 32. As an intermediate component for power transmission, it transmits the rotational power of the drive shaft 32 to the footrest drive component 34 and the arc-shaped connector 35. Both the footrest drive component 34 and the arc-shaped connector 35 are fixedly connected to the shaft connector 33, enabling them to move synchronously with the shaft connector 33. The footrest drive component 34 is mainly used to cooperate with the first linkage component 11 to convert the power transmitted by the rotating shaft connector 33 into the power to drive the footrest component to move, thereby realizing the unfolding or retraction of the footrest component. The arc-shaped connector 35 is connected to the tension elastic component 36, and the other end of the tension elastic component 36 is connected to the mounting base. It can generate a stretching or contracting elastic force when the arc-shaped connector 35 moves, and always apply a stable tension to the arc-shaped connector 35, so that the arc-shaped connector 35 is always in a taut state during the movement. At the same time, it switches the direction of the elastic force at a specific movement position to assist the rotating shaft 32 in rotating, thereby driving the footrest drive component 34 to automatically complete the unfolding or retraction of the footrest component. The user can easily trigger the entire footrest opening component 3 by turning the handle 31. This ensures the smoothness and stability of the unfolding and retraction of the footrest component, and also enables automatic opening and closing with the assistance of the elastic force of the tension elastic component 36, improving the convenience of operation. At the same time, it ensures that the footrest opening component 3 can stably provide driving power to the first linkage component 11 and simultaneously transmit power to the locking component 2.

[0036] In a specific embodiment, such as Figure 11 As shown, the segmented locking assembly 2 includes a locking drive component 21, a drive transmission unit 22, a locking execution unit 23, a segmented gear plate 24, and a drive fixing component 25. The locking drive component 21 is fixedly connected to the drive shaft 32, the drive transmission unit 22 is driven by the locking drive component 21, the drive fixing component 25 provides rotational support for the drive transmission unit 22, and the locking execution unit 23, driven by the drive transmission unit 22, is inserted into the segmented gear plate 24 to achieve multi-level locking.

[0037] The locking drive component 21 is fixedly connected to the drive shaft 32 and rotates synchronously with the drive shaft 32, directly transmitting the power from the drive shaft 32 to the drive transmission unit 22, thus becoming the power input component for the locking action of the locking assembly 2. The drive fixing component 25 provides stable support for the drive transmission unit 22, ensuring that the drive transmission unit 22 maintains its predetermined trajectory during movement and does not deviate. The drive transmission unit 22 moves under the drive of the locking drive component 21, converting the rotational power of the locking drive component 21 into the reciprocating motion power required by the locking execution unit 23, and accurately transmitting it to the locking execution unit 23. The locking execution unit 23 reciprocates under the drive of the drive transmission unit 22. When the device is adjusted to the required posture, the locking execution unit 23 moves towards the dividing tooth plate 24 under the drive of the drive transmission unit 22, and forms a plug-in engagement with the dividing tooth plate 24. Through the corresponding plug-in with different tooth slots of the dividing tooth plate 24, multi-level locking of the movement posture of the extension component 1 is achieved. When the posture needs to be adjusted, the locking drive member 21 rotates in the opposite direction with the drive shaft 32, driving the drive transmission unit 22 to move in the opposite direction, thereby pulling the locking execution unit 23 out of the plug-in engagement with the dividing tooth plate 24, releasing the locking state, so that the extension component 1 can continue to adjust the posture.

[0038] The locking drive component 21 receives and transmits power, the drive fixing component 25 ensures the stability of power transmission, the drive transmission unit 22 completes power conversion and transmission, and the locking execution unit 23 cooperates with the dividing tooth plate 24 to achieve graded locking and unlocking, ultimately achieving stable positioning of the extension component 1 in multiple intermediate postures, avoiding posture slippage, allowing users to flexibly adjust and stably maintain a comfortable posture according to their own needs, while ensuring that the actions of the dividing locking component 2 and the footrest opening component 3 are synchronized, ensuring the smooth and reliable operation of the entire device.

[0039] In a specific embodiment, such as Figure 11 As shown, the drive transmission unit 22 includes a first drive rod 221, a drive elastic element 222, a second drive rod 223, and a drive connecting rod 224; the first drive rod 221 is connected to the second drive rod 223 through the drive elastic element 222, the middle part of the drive connecting rod 224 is rotatably connected to the drive fixing element 25, one end of the drive connecting rod 224 is in transmission cooperation with the second drive rod 223, and the other end is in transmission cooperation with the locking execution unit 23.

[0040] The first drive rod 221 receives the power transmitted by the locking drive component 21. It is linked with the second drive rod 223 through the drive elastic component 222. The drive elastic component 222 provides continuous elastic tension between the two, ensuring buffering and stable linkage during power transmission, and avoiding excessive rigidity in power transmission that could lead to component wear. The second drive rod 223 moves synchronously under the combined action of the first drive rod 221 and the drive elastic component 222, thereby driving one end of the cooperating drive link 224 to swing. The middle part of the drive link 224 rotates stably with the drive fixing component 25 as support, converting the linear motion of the second drive rod 223 into its own rotational motion, and then transmitting the power to the locking execution unit 23 through the other end, achieving precise conversion of power form. All components work in concert. The first drive rod 221 receives and transmits the initial power, the drive elastic element 222 adapts to the power transmission rhythm and provides buffering, the second drive rod 223 realizes the intermediate transmission of power, and the drive linkage 224 completes the conversion of power form with the support of the drive fixing element 25. The power input from the locking drive element 21 is smoothly and accurately transmitted to the locking execution unit 23, ensuring that the locking execution unit 23 can operate smoothly and form a stable connection with the dividing tooth plate 24. This ensures the reliability of the multi-level locking action of the dividing locking assembly 2, and allows the device to maintain a stable intermediate posture after any adjustment, effectively solving the technical problems of posture slippage and unstable support in existing devices.

[0041] In a specific embodiment, such as Figure 11 and Figure 18 As shown, the locking actuation unit 23 includes a locking pin 231 and a positioning pin 232; the first drive rod 221 is provided with a sliding pin 2211, and the second drive rod 223 is provided with a groove 2231 that slides with the sliding pin 2211; the locking pin 231 has a waist-shaped groove 2311, and the positioning pin 232 passes through the waist-shaped groove 2311 to limit the movement range of the locking pin 231; the locking pin 231 is inserted into the dividing tooth plate 24. The locking actuation unit 23 also includes a locking pin support member, which is used to slide the locking pin 231, and the locking pin 231 can slide along the locking pin support member and insert into the dividing tooth plate 24.

[0042] The sliding pin 2211 moves synchronously with the first drive rod 221 and slides directionally along the groove 2231 of the second drive rod 223, adapting to the relative motion state between the first drive rod 221 and the second drive rod 223, ensuring continuous and uninterrupted power transmission. The locking pin 231 receives the driving force transmitted by the drive linkage 224 and slides linearly. The positioning pin 232 passes through the waist-shaped groove 2311 of the locking pin 231, constraining the sliding trajectory and travel of the locking pin 231, preventing the locking pin 231 from deviating or exceeding the reasonable range of motion during movement. Within the defined movement range, it forms an insertion or disengagement engagement with the dividing tooth plate 24. When engaged, it restricts the movement state of the extension component 1, achieving graded locking of the device's posture. When disengaged, it releases the movement restriction on the extension component 1, allowing the device to continue adjusting its posture. The coordinated operation of each structure optimizes the power transmission effect of the drive transmission unit 22 and ensures the precise and stable movement of the locking pin 231. This ensures that the dividing locking component 2 can reliably complete multi-level locking and unlocking operations, allowing the device to remain stable when adjusted to any intermediate posture, effectively preventing posture slippage and improving the stability and smoothness of operation during device use.

[0043] In a specific embodiment, such as Figure 2 and Figure 3 As shown, the extension assembly 1 further includes an extension base 13, a seat frame assembly 14, a footrest assembly 15, and a backrest assembly 16; the extension base 13 is the support frame of the extension assembly 1, and the seat frame assembly 14, the first linkage assembly 11, and the second linkage assembly 12 are all assembled on the extension base 13; the footrest assembly 15 is driven to the first linkage assembly 11, and the backrest assembly 16 is driven to the second linkage assembly 12.

[0044] The extension base 13 serves as the overall frame of the extension assembly 1, neatly integrating the seat frame assembly 14, the first linkage assembly 11, and the second linkage assembly 12 into one unit. This allows all components to operate in an orderly manner on a unified structural basis. The seat frame assembly 14 provides a stable assembly foundation for the first linkage assembly 11 and the second linkage assembly 12, ensuring that the two sets of linkage assemblies maintain a stable relative position during movement. The first linkage assembly 11 and the footrest assembly 15 cooperate to convert the received driving force into the unfolding and retracting action of the footrest assembly 15. The second linkage assembly 12 and the backrest assembly 16 cooperate to complete the tilting and resetting action of the backrest assembly 16. Each component relies on the frame constraint of the extension base 13 to coordinate its actions, allowing the adjustment actions of the footrest assembly 15 and the backrest assembly 16 to be independent yet synchronously coordinated. This not only improves the smoothness and flexibility of the device's posture adjustment but also provides a stable structural carrier for the multi-level posture locking assembly 2 to achieve multi-level posture locking. This enables the device to smoothly complete multiple posture switching from sitting to leisure and reclining positions, while ensuring that the overall structure does not shift during adjustment, further enhancing the stability of the device's posture maintenance.

[0045] In a specific embodiment, such as Figure 2 As shown, the extension base 13 includes two extension pieces 131, a first connecting pipe 132, a second connecting pipe 133, a first crossbeam 134, and a second crossbeam; the first connecting pipe 132 and the second connecting pipe 133 are respectively connected to the lower parts of the two extension pieces 131, and the first crossbeam 134 and the second crossbeam are respectively connected to the upper parts of the two extension pieces 131, and both the first crossbeam 134 and the second crossbeam are fixedly engaged with the seat frame assembly 14.

[0046] Two extension plates 131 constitute the main support part of the extension base 13. The first connecting pipe 132 and the second connecting pipe 133 are respectively connected to the lower part of the two extension plates 131, connecting the two extension plates 131 into one, forming a stable structure at the bottom of the extension base 13. The first crossbeam 134 and the second crossbeam are respectively connected to the upper part of the two extension plates 131, further strengthening the structural integrity of the upper part of the extension base 13. The first crossbeam 134 and the second crossbeam are also fixedly engaged with the seat frame assembly 14, which securely sets the seat frame assembly 14 on the extension base 13, so that the extension base 13 forms a complete and sufficiently rigid frame structure, providing a reliable assembly support for the seat frame assembly 14, the first linkage assembly 11 and the second linkage assembly 12, ensuring that the extension base 13 remains stable as a whole during the movement of each linkage assembly, without deformation or relative displacement, ensuring the overall smooth operation of the extension assembly 1, and providing stable structural conditions for the attitude adjustment and subsequent locking positioning of the device.

[0047] In a specific embodiment, such as Figure 3As shown, the first linkage component 11 includes a first linkage rod 111, a support rod 112, a second linkage rod 113, and a footrest linkage rod 114; the first linkage rod 111, the support rod 112, the second linkage rod 113, and the footrest linkage rod 114 are all rotatably connected to the seat frame component 14, and the end of the footrest linkage rod 114 away from the seat frame component 14 is connected to the footrest component 15 in a transmission manner.

[0048] The first linkage rod 111, the support rod 112, the second linkage rod 113, and the footrest linkage rod 114 all rotate around the seat frame assembly 14. When subjected to force, they work together in a coordinated manner. After the external driving force is applied to the extension assembly 1, it will be transmitted to the first linkage rod 111 and the second linkage rod 113 in sequence. The two of them work together with the support rod 112 to stably transmit power, causing the footrest linkage rod 114 to rotate synchronously. The end of the footrest linkage rod 114 away from the seat frame assembly 14 converts the rotational motion into the power to drive the footrest assembly 15 to move, so that the footrest assembly 15 can smoothly complete the unfolding or retracting action. The coordinated rotation of each component ensures that the power transmission is smooth and without any jamming or deviation, so that the movement of the footrest assembly 15 is precisely matched with the power transmission of the first linkage assembly 11, ensuring the stability of the posture adjustment of the extension assembly 1. In coordination with the second linkage assembly 12 and the locking assembly 2, the device can smoothly complete the switching of multiple postures. At the same time, it ensures that the footrest assembly 15 can maintain coordination with the overall structure in any adjustment position, and works with the locking assembly 2 to achieve stable positioning, avoiding disjointed movements or posture slippage.

[0049] In a specific embodiment, such as Figure 3 and Figure 4 As shown, the second linkage component 12 includes a first lifting link 121, a second lifting link 122, a first limiting bushing 123, and a second limiting bushing 124; one end of the first lifting link 121 is rotatably connected to the support rod 112, and the other end is rotatably connected to the second lifting link 122; the second lifting link 122 is fixedly connected to the backrest component 16; the first limiting bushing 123 and the second limiting bushing 124 are respectively used to limit the movement stroke and reset position of the second linkage component 12.

[0050] The first lifting link 121 rotates with the support rod 112, and can synchronously generate a linkage action following the swing of the support rod 112. This smoothly transfers the power transmitted by the first linkage component 11 to the second lifting link 122. While maintaining a rotational engagement with the first lifting link 121, the second lifting link 122 is fixedly connected to the backrest assembly 16. It can completely convert its own swinging motion into the tilting or resetting motion of the backrest assembly 16, achieving continuous adjustment of the backrest angle. During the overall rearward lifting movement of the second linkage component 12, the first limiting bushing 123 constrains the movement amplitude of the second lifting link 122, limiting the maximum tilting angle of the backrest assembly 16 and preventing excessive movement that could cause structural damage. In the event of structural damage, the second limiting bushing 124 precisely limits the return position of the second linkage component 12 during the process of the device resetting from a reclining or leisure posture to a sitting posture, ensuring that the backrest component 16 can stably return to the initial sitting posture. Through continuous rotational coordination and limiting constraints, the angle adjustment process of the backrest component 16 is smooth and controllable, forming a coordinated movement with the footrest component 15 driven by the first linkage component 11 to complete the switching action of the device in multiple postures. At the same time, it provides a stable motion basis for the multi-level locking positioning of the gear locking component 2, ensuring that the device can achieve reliable position fixation in any intermediate adjustment posture, and improving the stability of the overall structural operation and the accuracy of posture adjustment.

[0051] In a specific embodiment, such as Figure 5 and Figure 6 As shown, the footrest assembly 15 includes an extended footrest plate 151, a footrest bracket 152, a first leg connecting rod 153, a second leg connecting rod 154, a first footrest connector 155, a second footrest connector 156, a third limiting bushing 157, and a footrest elastic member 158. The extended footrest plate 151 is rotatably connected to the footrest bracket 152. The first leg connecting rod 153 and the second leg connecting rod 154 are rotatably connected to the footrest bracket 152 and the extension piece 131, respectively. The third limiting bushing 157 is sleeved on the outside of the second footrest connector 156. The footrest elastic member 158 is used to provide a restoring force for the footrest assembly 15.

[0052] The extended footrest 151 and the footrest bracket 152 form a rotatable engagement, allowing for angle adjustment relative to the footrest bracket 152 to accommodate different user leg support needs. The first leg link 153 and the second leg link 154 respectively form a rotatable engagement with the footrest bracket 152 and the extension plate 131, providing stable support for the footrest bracket 152 through their own swinging motion, and driving the footrest bracket 152 to complete the unfolding and retracting actions. The first footrest connector 155 and the second footrest connector 156 connect the transmission structure of the footrest assembly 15, ensuring that the power transmitted by the first linkage component 11 can smoothly act on the footrest assembly 15. The third limiting bushing 157 is sleeved on the outside of the second footrest connector 156, providing support for the second footrest assembly 15. The movement stroke of the footrest connector 156 is constrained, thereby limiting the maximum range of motion of the footrest assembly 15 and preventing excessive movement of the components from causing structural damage. The footrest elastic element 158 ​​continuously provides a stable reset force to the footrest assembly 15, which drives the footrest assembly 15 to smoothly return to its initial state when the device is retracted. Through the coordinated work of rotational cooperation, stroke limit and elastic reset, the components enable the footrest assembly 15 to accurately follow the drive of the first linkage assembly 11 to complete the action. It coordinates with the adjustment process of the backrest assembly 16 to achieve smooth switching of the device's multiple postures. At the same time, it provides a stable motion carrier for the multi-level locking positioning of the gear locking assembly 2, improving the stability of the device's posture adjustment and the reliability of the use process.

[0053] In a specific embodiment, the backrest assembly 16 includes a backrest insert 161 and a backrest support 162; one end of the backrest insert 161 is rotatably connected to the seat frame assembly 14, and the other end is fixedly connected to the backrest support 162; the end of the backrest support 162 away from the backrest insert 161 is fixedly connected to the second lifting link 122.

[0054] The backrest insert 161 swings around the seat frame assembly 14, providing a stable rotational base for the entire backrest assembly 16. The end of the backrest insert 161 furthest from the seat frame assembly 14 is fixedly connected to the backrest support 162, stably transmitting its swinging motion to the backrest support 162. The end of the backrest support 162 furthest from the backrest insert 161 is fixedly connected to the second lifting linkage 122, directly receiving the power transmitted by the second lifting linkage 122. Synchronously with the movement of the second lifting linkage 122, the backrest insert 161 swings, thus realizing the rotation of the backrest assembly. The backrest assembly 16's tilt adjustment and reset action, through the coordinated cooperation of fixed connection and rotation of each component, allows the power of the second linkage component 12 to be transmitted to the backrest assembly 16 without loss. This ensures that the movement of the backrest assembly 16 is highly synchronized with the movement of the second linkage component 12, and coordinates with the adjustment process of the footrest assembly 15. Together, they complete the multi-position switching of the device from sitting to leisure and reclining positions. At the same time, they provide stable motion coordination for the multi-level locking positioning of the gear locking component 2, ensuring that the backrest assembly 16 can achieve stable positioning synchronously with the overall structure in any intermediate adjustment position of the device.

[0055] In a specific embodiment, the extension component 1 further includes a reset elastic element 17, one end of which is connected to the seat frame component 14 and the other end is connected to the extension base 13, for providing tension for the reset of the second linkage component 12.

[0056] The reset elastic element 17 is connected to the seat frame assembly 14 and the extension base 13 respectively. During the process of the second linkage assembly 12 driving the backrest assembly 16 to tilt backward, the reset elastic element 17 will generate elastic stretch synchronously with the movement of the second linkage assembly 12, continuously accumulating elastic tension. When the user releases the force applied to the backrest assembly 16, the reset elastic element 17 releases the accumulated tension. Through the structural transmission between the seat frame assembly 14 and the extension base 13, it provides a stable and continuous reset driving force for the second linkage assembly 12, driving the second linkage assembly 12 to smoothly return to the initial working position, and then driving the backrest assembly 16 to complete the reset action in an orderly manner. This ensures that the reset process of the second linkage assembly 12 is smooth and controllable, and maintains coordination with the retraction action of the first linkage assembly 11 and the footrest assembly 15. With the unlocking operation of the gear locking assembly 2, it ensures that the device resets from a lying or leisure position to a sitting position in a stable and orderly manner, further improving the smoothness of the overall device's posture adjustment and reset and its reliability.

[0057] In a specific embodiment, the multi-posture extension device further includes a rocking assembly 4, which is fixed to the mounting base. The extension assembly 1 is fixed to the rocking assembly 4, meaning that the extension assembly 1 is indirectly connected to the mounting base through the rocking assembly 4, achieving a stable assembly of the entire extension assembly 1 and other components of the device with the mounting base. The rocking assembly 4 is internally equipped with a spring and a limiting bushing. Its core function is to drive the entire multi-posture extension device to rock back and forth, meeting the user's needs for the rocking function. Specifically, when the device is in a seated position, relying on the structural characteristics of the rocking assembly 4, the entire device can swing back and forth with the pivot on the rocking assembly 4, achieving the effect of a rocking sofa. Meanwhile, the rocking component 4 can also coordinate with the posture adjustment action of the extension component 1. When the user applies pressure to the backrest component 16 through their back and the drive device tilts backward, when the pressure reaches a certain value, the rear spring inside the rocking component 4 will be compressed, causing the extension component 1 and the entire device to tilt backward synchronously until the limiting bushing at the rear of the rocking component 4 contacts the corresponding component to achieve the limit, thus preventing excessive backward tilting of the device and causing structural damage. When the device returns to the sitting position from a reclining or leisure position, the compressed spring inside the rocking component 4 releases its elasticity synchronously, causing the rocking component 4 to return to its initial position. This, in conjunction with the reset elastic component 17, the footrest elastic component 158, and other components, ensures that the entire device returns to its original position smoothly. Working together with the extension component 1, the gear locking component 2, and the footrest opening component 3, it further improves the stability of the device's posture adjustment and the user experience.

[0058] The multi-posture extension device of Example 1 has the following specific transition process between its various postures: In a seated position, such as Figure 3 and Figure 4 As shown, the extension component 1 is fixed to the rocking component 4, and the rocking component 4 is fixed to the mounting base. Thanks to the action of the rocking component 4, the entire device can swing back and forth with the rotating shaft set on the rocking component 4 to achieve the effect of a rocking sofa. At this time, the extension component 1 is in the retracted state, the first linkage component 11 and the second linkage component 12 are both in the initial position, the footrest component 15 is retracted, the backrest component 16 is basically in the vertical state, the partition locking component 2 is in the locked state, the locking drive component 21 is fixedly connected to the drive rotating shaft 32, the locking pin 231 passes through the locking pin support component of the locking execution unit 23, and the front end is inserted into the initial tooth groove of the partition tooth plate 24. The positioning pin 232 passes through the waist-shaped groove 2311 of the locking pin 231 to achieve sliding limit. The drive fixing component 25 fixes and supports the drive connecting rod 224. The first drive pull rod 221, the drive elastic component 222, and the second drive pull rod 223 of the drive transmission unit 22 are all in the initial state, the footrest opening component 3 is in the initial position, and all components are in a stable initial working state.

[0059] From sitting posture to relaxed posture (such as...) Figure 5 and Figure 6 The movement of the (shown) component is mainly controlled by the first linkage component 11, while the locking component 2 works in conjunction to unlock and lock throughout the process. Pulling the handle 31 causes the drive shaft 32 to rotate, and the locking drive component 21, which is fixedly connected to the drive shaft 32, rotates clockwise in sync. The locking drive component 21 drives the first drive rod 221 to move forward. The sliding pin 2211 on the first drive rod 221 slides forward in the groove 2231 of the second drive rod 223, while simultaneously stretching the drive elastic component 222. As the tension of the drive elastic component 222 increases, the second drive rod 223 moves forward along with the first drive rod 221. The forward movement causes the drive linkage 224 to rotate around the drive fixing member 25. The lower end of the drive linkage 224 pushes the locking pin 231 of the locking actuator 23 to slide backward within the locking pin support, causing the locking pin 231 to disengage from the initial tooth groove of the dividing tooth plate 24. The dividing locking assembly 2 is then released from locking. At the same time, the rotating shaft connector 33, which is fixedly connected to the drive shaft 32, rotates synchronously. The rotating shaft connector 33 has a U-shaped structure, with one end connected to the arc-shaped connector 35 and the other end connected to the foot rest drive member 34. A tension elastic member 36 is connected between the rear end of the arc-shaped connector 35 and the mounting base, allowing the arc-shaped connector 35 to rotate backward. During rotation, the footrest drive component 34 remains taut. Driven forward and upward by the pivot connector 33, it pushes the second footrest connector 156 to rotate upward, thereby opening the entire footrest assembly 15 upward. During this process, the connection point between the arc-shaped connector 35 and the pivot connector 33 is always on the same straight line as the axis of the tension elastic component 36. When this straight line rotates upward past the axis of the drive pivot 32, the elastic force direction of the tension elastic component 36 switches to the upper end of the drive pivot 32, and the tension is consistent with the rotation direction. The tension elastic component 36 pulls the drive pivot 32 to rotate, thereby automatically opening the footrest assembly 15. When the third limit bushing 15... After contact with the limiting surface of the second foot rest connector 156, the foot rest assembly 15 opens to its maximum position. At this time, the human body releases the handle 31, the driving elastic element 222 releases the tension, and drives the first driving rod 221, the second driving rod 223 and the driving connecting rod 224 to reset, pushing the locking pin 231 to slide forward and re-insert into the corresponding tooth groove of the dividing tooth plate 24. The dividing locking assembly 2 completes the locking, fixing the device in a leisure posture. The extension plate 131 is connected by the driving shaft 32. The foot rest opening assembly 3 is symmetrically arranged on both sides of the extension plate 131 so that one handle 31 can control the opening of both sides of the extension plate 131 at the same time.

[0060] From relaxed posture to lying down posture (such as) Figure 7 and Figure 8The movement (as shown) is mainly controlled by the second linkage component 12. The step-locking component 2 achieves step-by-step locking to achieve any position of suspension and zero-gravity posture. The human body applies pressure to the backrest insert 161 through the backrest backrest support 162, causing the support rod 112 to be lifted upwards by lever. The lifting height is controlled by the first lifting link 121, the second lifting link 122, and the first limiting bushing 123. During the lifting process, the second lifting link 122 and the first limiting bushing 123 first disengage, then become tangent, and the maximum lifting height is reached after they become tangent again. At the same time, the connection between the first lifting link 121 and the second lifting link 122 prevents the front end of the extension component 1 from swinging left and right. The reset elastic element 17 is connected in the middle of the seat frame component 14 and the extension base 13. During the lifting process, the reset elastic element 17 stretches as the lifting height increases, and the force of the human body leaning backward needs to be gradually increased. As the force increases, the dividing tooth plate 24 moves downward with the extension assembly 1. The tooth grooves of the dividing tooth plate 24 push the locking pin 231 forward, disengaging it from the current tooth groove. Since the driving elastic element 222 always applies a backward pushing force to the locking pin 231, the locking pin 231 will immediately insert into the next tooth groove of the dividing tooth plate 24, achieving step-by-step locking. The human body can control the downward pressure and the elastic force of the reset elastic element 17 to make the device hover at any angle. When the force applied by the human body increases to a certain value, the rocking assembly 4 begins to compress the internal rear spring, and the rocking assembly 4 begins to tilt backward until the limiting bushing at the rear end of the rocking assembly 4 stops. At this time, the extension assembly 1 reaches the maximum lifting angle, the footrest assembly 15 is fully opened, the backrest assembly 16 tilts backward at the maximum angle, and the dividing locking assembly 2 inserts the locking pin 231 into the lowest tooth groove of the dividing tooth plate 24, achieving a zero-gravity posture (such as...). Figure 9 and Figure 10 The locking mechanism (as shown) provides comfortable zero-gravity support for the human body.

[0061] During the transition from a reclining to a relaxed posture, the body reduces the force exerted on the backrest insert 161 by the backrest, and with the support of the backrest support 162, the extension component 1 is gradually pulled back by the reset elastic element 17. At this time, the dividing tooth plate 24 moves upward with the extension component 1. Since the dividing tooth plate 24 is a one-way locking structure, it will not push the locking pin 231 out of the tooth groove when moving upward. The dividing locking component 2 maintains the locked state, ensuring that the extension component 1 will not shake randomly during the reset process, until the bottom limiting surface on the support rod 112 contacts the second limiting bushing 124. At this time, the extension component 1 returns to the relaxed posture, the footrest component 15 remains open, the locking pin 231 is still inserted into the corresponding tooth groove of the dividing tooth plate 24, and the dividing locking component 2 continues to maintain the lock, ensuring the stability of the relaxed posture.

[0062] During the transition from a relaxed to a seated posture, the body applies force to the footrest bracket 152 by pressing down with the legs, while simultaneously rising and retracting the back force to bring the footrest assembly 15 back together. At the same time, the footrest linkage rod 114 moves downward, pulling the seat frame assembly 14 forward. During this process, the second footrest connector 156 rotates downward, thereby driving the footrest drive member 34 to move backward. The footrest drive member 34 drives the rotating shaft connector 33 to rotate, which in turn drives the arc-shaped connector 35 to move forward and downward, simultaneously driving the rotating shaft 32 to rotate counterclockwise, causing the locking drive member 21 to rotate counterclockwise in sync. The locking drive member 21 pushes the first drive lever 221 backward. At this time, the drive elastic member 222 is still in a stretched state, and the stop block at the rear end of the locking pin 231 is still engaged with the tooth groove of the dividing tooth plate 24, until the sliding pin 2211 at the rear end of the first drive lever 221 abuts against the sliding groove 2231 of the second drive lever 223. The second drive lever 223 then moves with the first drive lever 221. Together they move backward, thereby driving the drive linkage 224 to rotate. The tail of the drive linkage 224 pulls the locking pin 231 forward, causing the locking pin 231 to slide forward and disengage from the tooth groove of the dividing tooth plate 24. The dividing locking assembly 2 is then released. During this process, the connection point of the arc-shaped connector 35 and the rotating shaft connector 33 is always on the same straight line as the axis of the tension elastic member 36. When this straight line rotates downward past the axis of the drive rotating shaft 32, the elastic force direction of the tension elastic member 36 switches to the drive shaft. At the lower end of the rotating shaft 32, the tension is in the same direction as the rotation. The stretching elastic element 36 pulls the driving rotating shaft 32 to rotate, thereby automatically tightening the foot rest assembly 15 until the third limiting bushing 157 is tangent to the upper limiting surface of the first foot rest connector 155. At this time, the device returns to the sitting position, and all components return to their initial state. The locking drive component 21 drives the drive transmission unit 22 to reset, and the locking pin 231 is re-inserted into the initial tooth groove of the dividing tooth plate 24. The dividing locking assembly 2 returns to the locked state.

[0063] Example 2 This embodiment provides a seat, including a seat body and the multi-posture extension device described in Embodiment 1, wherein the seat body is connected to the extension component 1.

[0064] The main body of the seat is fixedly assembled with the extension component 1. As the direct support component for the human body, the bottom of the main body is connected to the seat frame component 14 of the extension component 1, ensuring that the main body of the seat can switch postures synchronously with the movement of the extension component 1. When the first linkage component 11 and the second linkage component 12 of the extension component 1 move, the main body of the seat switches to a sitting posture, a leisure posture, or a zero-gravity reclining posture in sync with the folding and extension of the extension component 1. When the footrest component 15 of the extension component 1 opens, the leg support part of the main body of the seat can provide leg support. When the backrest component 16 moves, the back support part of the main body of the seat adjusts the tilt angle synchronously to adapt to the support needs of the human body in different postures. By relying on the rocking component 4 connected to the extension component 1, the main body of the seat can rock back and forth with the swing of the rocking component 4, improving the comfort of use. When the position locking component 2 of the extension component 1 locks the posture, the main body of the seat can be stably maintained in the current posture, avoiding accidental posture deviation. The entire assembly structure can ensure smooth power transmission between the main body of the seat and the extension component 1, ensuring the stability and reliability of the seat in multiple posture conversions, while simplifying the overall structure of the seat and improving the ease of assembly.

[0065] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-posture extension device, characterized in that, It includes a mounting base, an extension component, and a locking component; both the extension component and the locking component are located on the mounting base; the extension component includes a first linkage component and a second linkage component, the first linkage component is used to drive the footrest movement, and the second linkage component is used to drive the backrest to tilt and return to its original position; the locking component cooperates with the extension component to achieve multi-level locking and positioning of the movement posture of the extension component.

2. The multi-posture extension device according to claim 1, characterized in that, The multi-posture extension device also includes a footrest opening component; the footrest opening component is in transmission cooperation with the first linkage component and the segmented locking component, the footrest opening component is used to drive the footrest component to complete the unfolding or retracting action, and to provide driving power for the segmented locking component.

3. The multi-posture extension device according to claim 2, characterized in that, The footrest opening assembly includes a handle, a drive shaft, a shaft connector, a footrest drive component, an arc-shaped connector, and a tension elastic component. The handle is connected to the drive shaft, the shaft connector is sleeved on the outside of the drive shaft, the footrest drive component and the arc-shaped connector are both fixedly connected to the shaft connector, and the tension elastic component is connected to the arc-shaped connector and the mounting base, respectively.

4. The multi-posture extension device according to claim 3, characterized in that, The segmented locking assembly includes a locking drive component, a drive transmission unit, a locking execution unit, a segmented gear plate, and a drive fixing component. The locking drive component is fixedly connected to the drive shaft, the drive transmission unit cooperates with the locking drive component, the drive fixing component provides rotational support for the drive transmission unit, and the locking execution unit, driven by the drive transmission unit, engages with the segmented gear plate to achieve multi-level locking.

5. The multi-posture extension device according to claim 4, characterized in that, The drive transmission unit includes a first drive rod, a drive elastic element, a second drive rod, and a drive connecting rod; the first drive rod is connected to the second drive rod through the drive elastic element, the middle part of the drive connecting rod is rotatably connected to the drive fixing element, one end of the drive connecting rod is in drive engagement with the second drive rod, and the other end is in drive engagement with the locking execution unit.

6. The multi-posture extension device according to claim 5, characterized in that, The locking actuator includes a locking pin and a positioning pin; the first drive rod is provided with a sliding pin, and the second drive rod is provided with a sliding groove that slides with the sliding pin; the locking pin is provided with a waist-shaped groove, and the positioning pin passes through the waist-shaped groove to limit the movement range of the locking pin; the locking pin is inserted into the dividing tooth plate.

7. The multi-posture extension device according to claim 1, characterized in that, The extension assembly further includes an extension base, a seat frame assembly, a footrest assembly, and a backrest assembly; the extension base is the support frame of the extension assembly, and the seat frame assembly, the first linkage assembly, and the second linkage assembly are all assembled on the extension base; the footrest assembly is driven to the first linkage assembly, and the backrest assembly is driven to the second linkage assembly.

8. The multi-posture extension device according to claim 7, characterized in that, The extension base includes two extension plates, a first connecting pipe, a second connecting pipe, a first crossbeam, and a second crossbeam; the first connecting pipe and the second connecting pipe are respectively connected to the lower part of the two extension plates, and the first crossbeam and the second crossbeam are respectively connected to the upper part of the two extension plates, and the first crossbeam and the second crossbeam are fixedly engaged with the seat frame assembly.

9. The multi-posture extension device according to claim 7, characterized in that, The first linkage component includes a first linkage rod, a support rod, a second linkage rod, and a footrest linkage rod; the first linkage rod, the support rod, the second linkage rod, and the footrest linkage rod are all rotatably connected to the seat frame assembly, and the end of the footrest linkage rod away from the seat frame assembly is drively connected to the footrest assembly.

10. The multi-posture extension device according to claim 9, characterized in that, The second linkage component includes a first lifting link, a second lifting link, a first limiting bushing, and a second limiting bushing; one end of the first lifting link is rotatably connected to the support rod, and the other end is rotatably connected to the second lifting link; the second lifting link is fixedly connected to the backrest assembly; the first limiting bushing and the second limiting bushing are used to limit the movement stroke and reset position of the second linkage component, respectively.

11. The multi-posture extension device according to claim 7, characterized in that, The footrest assembly includes an extended footrest plate, a footrest bracket, a first leg link, a second leg link, a first footrest connector, a second footrest connector, a third limiting bushing, and a footrest elastic element. The extended footrest plate is rotatably connected to the footrest bracket, the first leg link and the second leg link are rotatably connected to the footrest bracket and the extension plate, respectively, the third limiting bushing is sleeved on the outside of the second footrest connector, and the footrest elastic element is used to provide a restoring force for the footrest assembly.

12. The multi-posture extension device according to claim 10, characterized in that, The backrest assembly includes a backrest insert and a backrest support; one end of the backrest insert is rotatably connected to the seat frame assembly, and the other end is fixedly connected to the backrest support; the end of the backrest support away from the backrest insert is fixedly connected to the second lifting link.

13. The multi-posture extension device according to claim 7, characterized in that, The extension assembly 1 also includes a reset elastic element, one end of which is connected to the seat frame assembly and the other end of which is connected to the extension base, for providing tension for the reset of the second linkage assembly.

14. A seating arrangement, characterized in that, It includes a seating body and a multi-posture extension device as described in any one of claims 1-13, wherein the seating body is connected to the extension assembly.

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