Reclining zero-wall extension device and sofa bed

Abstract

The application discloses a zero-wall-relying stretching device and a sofa bed, which comprises a base assembly, a slide rail assembly, a cushion sliding support assembly, a backrest lying flat assembly and a driving assembly. The slide rail assembly is arranged on the base assembly, the cushion sliding support assembly is slidably connected with the slide rail assembly, the backrest lying flat assembly comprises a connecting rod mechanism, the connecting rod mechanism has a first end movably connected with the base assembly, a second end movably connected with the cushion sliding support assembly and a backrest mounting portion for mounting the backrest, and the driving assembly is arranged on the base assembly and is drivingly connected with the cushion sliding support assembly. When the driving assembly drives the cushion sliding support assembly to slide forward along the slide rail assembly, the second end of the cushion sliding support assembly drives the connecting rod mechanism to move and deform, the backrest mounting portion moves downward and is folded backward to a lying flat state, no turning space needs to be reserved at the rear, the zero-wall-relying placement is realized, and the backrest can be completely flushly spliced with the cushion to form a flat supporting surface to be converted into a sofa bed mode.

Description

Technical Field

[0001] This invention relates to the field of smart home technology, and in particular to a reclining, zero-wall-adhesion extendable device and sofa bed. Background Technology

[0002] Existing sofas and sofa beds typically incorporate electric or manual mechanical extension mechanisms to switch between sofa and sofa bed positions. Currently, most solutions achieve this by reclining the backrest. However, this method has several drawbacks: the backrest requires sufficient space to flip back during reclining, preventing the sofa from being placed flush against a wall and wasting interior space; furthermore, a slight angle remains between the backrest and the seat cushion after reclining, affecting user comfort. Therefore, achieving a sofa that can be placed without any wall contact while the backrest is fully reclined has become a pressing technical challenge in this field. Summary of the Invention

[0003] Embodiments of the present invention provide a zero-wall-adhesion extendable device and sofa bed that can be laid flat, aiming to solve the problems of existing sofas that cannot be placed against a wall and whose backrests cannot be completely flush with the seat cushions when lying flat.

[0004] In a first aspect, the present invention provides a reclining, zero-wall-adhesion extension device, comprising: Base assembly; A slide rail assembly is disposed on the base assembly; The seat cushion sliding support assembly is slidably connected to the slide rail assembly and can slide back and forth along the slide rail assembly. A reclining backrest assembly includes a linkage mechanism having a first end movably connected to the base assembly, a second end movably connected to the seat cushion sliding support assembly, and a backrest mounting portion for mounting the backrest; and A drive component is mounted on the base assembly and is drivenly connected to the seat cushion sliding support assembly. When the drive assembly drives the seat cushion sliding support assembly to slide forward along the slide rail assembly, the seat cushion sliding support assembly drives the linkage mechanism to move and deform through the second end, causing the backrest mounting part to move downward and fold backward to a flat state.

[0005] Furthermore, the linkage mechanism is a deformable quadrilateral linkage mechanism; wherein, when the seat cushion sliding support assembly slides backward to its limit position, the quadrilateral linkage mechanism deforms to a folded form, thereby causing the backrest mounting part to be in a generally vertical state; when the seat cushion sliding support assembly slides forward to its limit position, the quadrilateral linkage mechanism deforms to an unfolded form, thereby causing the backrest mounting part to be in a generally horizontal state.

[0006] Furthermore, the quadrilateral linkage mechanism includes a front support rod, a rear support rod, a backrest mounting rod, and a connecting rod; the front support rod constitutes the second end of the linkage mechanism and is hinged to the seat cushion sliding support assembly; the front support rod is also hinged to the connecting rod and the rear support rod respectively; the rear support rod constitutes the first end of the linkage mechanism and is hinged to the base assembly; the rear support rod is also hinged to the front support rod and the backrest mounting rod respectively; the backrest mounting rod constitutes the backrest mounting part and is hinged to the connecting rod and the rear support rod respectively; the connecting rod is hinged to the front support rod and the backrest mounting rod respectively; the front support rod, the connecting rod, the backrest mounting rod, and the rear support rod are sequentially hinged to form a quadrilateral structure.

[0007] Furthermore, one end of the front support rod is hinged to the rear end of the seat cushion sliding support assembly; the rod body of the front support rod is hinged to one end of the connecting rod; and the other end of the front support rod is hinged to the rear support rod. One end of the rear support rod is hinged to the base assembly; the rod body of the rear support rod is hinged to the other end of the front support rod; and the other end of the rear support rod is hinged to the backrest mounting rod. One end of the backrest mounting rod is hinged to the other end of the connecting rod; the rod body of the backrest mounting rod is hinged to the other end of the rear support rod. One end of the connecting rod is hinged to the rod body of the front support rod; and the other end of the connecting rod is hinged to one end of the backrest mounting rod. The segment between the rod body and the other end of the front support rod, the connecting rod, the backrest mounting rod, and the segment between the rod body and the other end of the rear support rod constitute the quadrilateral structure.

[0008] Furthermore, a first limiting member is fixedly provided at the rear end of the base assembly, and a first support body is provided on the first limiting member; a second limiting member is fixedly provided at the rear end of the seat cushion sliding support assembly, and a second support body is provided on the second limiting member; wherein, when the quadrilateral linkage mechanism is deformed to the unfolded form, the lower end of the rear support rod abuts against the first support body, and the lower end of the front support rod abuts against the second support body.

[0009] Furthermore, the reclining zero-wall extension device also includes a footrest assembly and a landing gear assembly. The footrest assembly is located at the front end of the seat cushion sliding support assembly, and the landing gear assembly is connected to the footrest assembly to support the footrest assembly as it unfolds and changes to a vertical state. The drive assembly is connected to the footrest assembly for driving the footrest assembly to retract and extend, and for driving the seat cushion sliding support assembly to slide back and forth on the slide rail assembly.

[0010] Furthermore, the drive assembly includes an electric push rod, a rotating connector, and a drive rod. The electric push rod is fixedly mounted on the base assembly. The drive end of the electric push rod is rotatably connected to one end of the rotating connector, and the other end of the rotating connector is fixedly connected to the shaft of the drive rod. The shaft end of the drive rod is connected to the foot rest assembly. The electric push rod is used to push or pull one end of the rotating connector along the seat depth direction to drive the rotating connector to rotate, thereby causing the drive rod to rotate around its axis, and thus causing the foot rest assembly to unfold or retract.

[0011] Furthermore, the footrest assembly includes a linkage assembly, a first connector for connecting to the front end of the seat cushion sliding support assembly, a second connector for connecting to the shaft end of the drive rod, a third connector for connecting to the footrest plate, and an elastic element. The two ends of the linkage assembly are respectively connected to the first connector and the third connector, and the linkage assembly is also connected to the second connector. The landing gear assembly is rotatably connected to the first connector and the linkage assembly. The two ends of the elastic element are respectively connected to the linkage assembly and the landing gear assembly. The elastic element is used to provide elastic tension to tighten the footrest assembly so that it maintains a folded-in tendency.

[0012] Furthermore, the base assembly has a front column and a support pulley at its front end. The support pulley is rotatably mounted on the front column. The seat cushion sliding support assembly includes a rear column and a seat cushion support beam. The rear column is vertically connected to the slide rail assembly. The rear end of the seat cushion support beam is fixedly connected to the top of the rear column. The bottom of the front end of the seat cushion support beam rests on the support pulley. The footrest assembly is located at the front end of the seat cushion support beam.

[0013] Furthermore, a pin is provided on the front column, and a sliding groove is provided on the seat support beam. The sliding groove extends from the front end of the seat support beam in the front-to-back direction toward the rear end. The pin passes through the sliding groove in the left-to-right direction. The front end and rear end of the sliding groove are respectively provided with a front stop and a rear stop for blocking the pin.

[0014] Secondly, embodiments of the present invention also provide a sofa, including the aforementioned reclining zero-wall extension device.

[0015] This invention provides a reclining, zero-wall-adhesion extendable device and sofa bed. A slide rail assembly is installed on the base assembly, and a seat cushion sliding support assembly is slidably connected to the slide rail assembly, allowing the seat cushion sliding support assembly to slide back and forth along the slide rail assembly. A backrest reclining assembly is also provided, with its linkage mechanism having a first end movably connected to the base assembly as a fulcrum and a second end movably connected to the seat cushion sliding support assembly. When the drive assembly drives the seat cushion sliding support assembly to slide forward along the slide rail assembly, the seat cushion sliding support assembly, through its second end, causes the linkage mechanism to move and deform, causing the backrest mounting part to move downwards and fold backwards to a reclining state. Due to the backrest's... The reclining mechanism achieves its effect by deforming the linkage to move the backrest mounting part downwards and fold it backwards, rather than the traditional method where the entire backrest flips backwards. Therefore, there is no need to reserve space behind the backrest for flipping during the reclining process, allowing the sofa to be placed against the wall, achieving zero-wall placement. At the same time, after the backrest mounting part moves downwards and folds backwards to the reclining state, the backrest and seat cushion are on the same horizontal plane without any angle, achieving a completely flush reclining of the backrest and seat cushion, transforming it into a sofa bed. This solves the problems of existing sofas not being able to be placed against a wall and the backrest not being able to lie completely flush with the seat cushion, achieving the effect of saving space and improving reclining comfort. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram illustrating the initial state of the reclining zero-wall-adhesion extension device according to an embodiment of the present invention is shown; Figure 2 A schematic diagram showing the extended seat cushion of the reclining zero-wall extension device according to an embodiment of the present invention is displayed. Figure 3a A side view showing the initial state of the reclining zero-wall extension device according to an embodiment of the present invention; Figure 3b A side view showing the initial state of the sofa bed according to an embodiment of the present invention; Figure 4a A side view of the seat cushion of the reclining zero-wall extension device according to an embodiment of the present invention is shown in the extended state. Figure 4b A side view showing the sofa bed of an embodiment of the present invention with the seat cushion extended; Figure 5 A schematic diagram showing the backrest reclining component of the zero-wall-adhesion extendable device according to an embodiment of the present invention is in a generally vertical state. Figure 6A schematic diagram showing the backrest lying flat assembly of the zero-wall-adhesion extendable device according to an embodiment of the present invention is in a generally horizontal state. Figure 7 A schematic diagram showing the open state of the footrest of the reclining zero-wall extension device according to an embodiment of the present invention; Figure 8a A side view of the footrest of the reclining zero-wall extension device according to an embodiment of the present invention is shown in the open state; Figure 8b A side view of the sofa bed according to an embodiment of the present invention with the footrest open is shown. Figure 9 Showing Figure 7 Enlarged view of part D; Figure 10 Showing Figure 3a Enlarged view of part C; Figure 11 Showing Figure 8b Enlarged view of part F; Figure 12 Showing Figure 7 Enlarged view of part E; Figure 13 Showing Figure 1 Enlarged view of part A; Figure 14 Showing Figure 2 Enlarged view of part B; Figure 15 A schematic diagram illustrating the initial state of the sofa bed according to an embodiment of the present invention is shown; Figure 16 A schematic diagram showing the sofa bed with its footrest open according to an embodiment of the present invention is provided. Figure label: 1. Base assembly; 11. Front column; 12. Support pulley; 13. Pin; 14. First limiting component; 15. First support body; 2. Slide rail assembly; 3. Seat cushion sliding support assembly; 31. Rear column; 32. Seat cushion support beam; 321. Slide groove; 322. Front stop; 323. Rear stop; 33. Second limiting component; 34. Second support body; 4. Drive assembly; 41. Electric push rod; 42. Rotating connector; 43. Drive rod; 5. Footrest assembly; 51. Linkage assembly; 52. First connector; 53. Second connector; 54. Third connector; 55. Elastic component; 6. Landing gear assembly; 7. Backrest reclining assembly; 71. Front support rod; 72. Rear support rod; 73. Backrest mounting rod; 74. Connecting rod; 100. Seat cushion; 200. Backrest; 300. Footrest. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrating and understanding this invention, and not for limiting it. Furthermore, in the drawings, structures that are similar or identical are indicated by the same reference numerals.

[0020] Features described in the context of different aspects and embodiments of the invention may be used together and / or interchanged. Similarly, features described in the context of a single embodiment may be provided individually or in any suitable sub-combination.

[0021] As people's demands for quality of home life continue to rise, sofa beds, as a type of furniture that combines sitting and reclining functions, have been widely used in home spaces, especially in small and medium-sized apartments. Sofa beds can switch between various usage scenarios within limited space, meeting users' needs for daily leisure and temporary rest. However, in actual use, users often want the sofa bed to be placed against a wall to maximize the use of indoor space, while also hoping to have a flat experience like a bed when lying down. This requires the sofa bed's backrest to be completely flat and flush with the seat when switching to a reclining position. However, existing sofa bed products struggle to balance space occupation and reclining comfort, generally having the problem of not being able to be placed against a wall and the backrest not being completely flat with the seat.

[0022] To address this, embodiments of the present invention provide a zero-wall-adhesion extendable device and sofa bed that can be laid flat. By driving the seat cushion sliding support assembly to slide forward along the slide rail assembly, the linkage mechanism of the backrest lying flat assembly is moved and deformed, causing the backrest mounting part to move downward and fold backward to a lying flat state, thereby realizing the zero-wall placement of the sofa and the backrest lying completely flat, thus improving the comfort of lying flat and saving space.

[0023] To better understand the above technical solution, a detailed description of the technical solution will be provided below in conjunction with the accompanying drawings and specific implementation methods. For ease of description, in this document, the area in front of a person sitting in a typical seated position on a sofa is defined as "front," the area behind is defined as "back," the left hand is defined as "left," and the right hand is defined as "right." It should be understood that these directional terms used for ease of description should not be construed as a specific limitation.

[0024] Please see Figures 1-16 This invention provides a reclining, zero-wall-leaning extension device, comprising: a base assembly 1, a slide rail assembly 2, a seat cushion sliding support assembly 3, a backrest reclining assembly 7, and a drive assembly 4. The slide rail assembly 2 is mounted on the base assembly 1. The seat cushion sliding support assembly 3 is slidably connected to the slide rail assembly 2 and can slide back and forth along the slide rail assembly 2. The backrest reclining assembly 7 includes a linkage mechanism, which has a first end movably connected to the base assembly 1, a second end movably connected to the seat cushion sliding support assembly 3, and a backrest mounting portion for mounting a backrest 200. The drive assembly 4 is mounted on the base assembly 1 and is drivenly connected to the seat cushion sliding support assembly 3. When the drive assembly 4 drives the seat cushion sliding support assembly 3 to slide forward along the slide rail assembly 2, the seat cushion sliding support assembly 3 drives the linkage mechanism to move and deform through the second end, causing the backrest mounting portion to move downward and fold backward to a reclining state.

[0025] Specifically, refer to Figure 1 and Figure 2 The base assembly 1 is the fundamental support structure of the entire extension device. Its shape can be a rectangular frame, a U-shaped frame, or other suitable frame shapes. Structurally, the base assembly 1 can be welded from metal tubing, assembled from profiles connected by bolts, formed by bending stamped steel plates, or a combination of a wooden frame and metal components. The function of the base assembly 1 is to support and install other functional components, providing stable bottom support for the entire extension device. The base assembly 1 is located at the very bottom of the entire device, placed on the ground or the base frame of a sofa. The slide rail assembly 2 is mounted on the base assembly 1, the first end of the backrest reclining assembly 7 is movably connected to the base assembly 1, and the drive assembly 4 is mounted on the base assembly 1.

[0026] The slide rail assembly 2 is a functional component that provides front-to-back sliding guidance, and its shape is an elongated strip extending in the front-to-back direction. Structurally, the slide rail assembly 2 can be a ball bearing slide rail, a roller slide rail, a sliding friction guide rail, or a linear guide rail or other structural forms that can provide linear sliding guidance. The function of the slide rail assembly 2 is to provide guidance and constraint for the front-to-back sliding of the seat cushion sliding support assembly 3, ensuring a smooth and stable sliding process. The slide rail assembly 2 is mounted on the base assembly 1 and extends in the front-to-back direction, usually with one set on each of the left and right sides. The fixed part of the slide rail assembly 2 is fixedly connected to the base assembly 1, and the sliding part of the slide rail assembly 2 is connected to the seat cushion sliding support assembly 3. The seat cushion sliding support assembly 3 achieves front-to-back sliding relative to the base assembly 1 through the slide rail assembly 2.

[0027] The seat cushion sliding support assembly 3 is a functional component used to support the seat cushion 100 and drive the seat cushion 100 to move back and forth. Its shape is a beam or frame extending in the front-to-back direction. The seat cushion sliding support assembly 3 can be a frame structure welded from metal tubing, a beam structure spliced ​​from profiles, or a plate beam structure formed by bending stamped steel plates. The function of the seat cushion sliding support assembly 3 is to support the seat cushion 100 and, driven by the drive assembly 4, slide back and forth along the slide rail assembly 2, realizing the front-to-back translational extension of the seat surface. The seat cushion sliding support assembly 3 is located above the base assembly 1 and is vertically opposite to the base assembly 1 via the slide rail assembly 2. The seat cushion sliding support assembly 3 is slidably connected to the slide rail assembly 2 and can slide back and forth along the slide rail assembly 2; the rear part of the seat cushion sliding support assembly 3 is movably connected to the second end of the backrest reclining assembly 7, and when the seat cushion sliding support assembly 3 slides back and forth, it can drive the backrest reclining assembly 7 to move through the second end; the seat cushion sliding support assembly 3 is also driven by the drive assembly 4, which provides the power for the back-to-back sliding.

[0028] The reclining backrest assembly 7 is the core functional component for enabling the posture transformation of the backrest 200, and it includes a linkage mechanism. The linkage mechanism has a first end, a second end, and a backrest mounting part. The first end is movably connected to the base assembly 1, the second end is movably connected to the seat cushion sliding support assembly 3, and the backrest mounting part is used to mount the backrest 200. The linkage mechanism can be composed of multiple links connected by hinges. The number of links can be three, four, five, or more, and the hinges between the links can be pin hinges, bolt hinges, riveting, or other rotatable connection methods. The function of the linkage mechanism is to transform the forward and backward sliding of the seat cushion sliding support assembly 3 into a posture transformation of the backrest mounting part through its own motion deformation, thus enabling the backrest 200 to switch between an upright sitting position and a horizontal reclining position. The reclining backrest assembly 7 is located at the rear upper part of the base assembly 1, and the backrest mounting part is located at the upper part of the linkage mechanism. The first end of the linkage mechanism is movably connected to the base assembly 1, serving as a fixed fulcrum when the linkage mechanism deforms; the second end of the linkage mechanism is movably connected to the seat cushion sliding support assembly 3, serving as the driving input end for the seat cushion sliding support assembly 3 to drive the linkage mechanism to deform; when the seat cushion sliding support assembly 3 slides forward, it pulls the linkage mechanism through the second end, causing the linkage mechanism to move and deform, and the backrest mounting part moves downward and folds backward accordingly.

[0029] The drive assembly 4 is a functional component that provides power to the entire extension device. The drive assembly 4 can use an electric push rod 41 as a power source, a manual push rod, a gas spring drive, or other drive forms capable of outputting linear reciprocating motion, such as a motor with a rack and pinion mechanism or a motor with a lead screw and nut mechanism. The function of the drive assembly 4 is to drive the seat cushion sliding support assembly 3 to slide back and forth along the slide rail assembly 2, thereby causing the backrest reclining assembly 7 to move and deform. The drive assembly 4 is mounted on the base assembly 1 and arranged in the front-to-back direction. One end of the drive assembly 4 is fixedly connected to the base assembly 1, and the other end is drivenly connected to the seat cushion sliding support assembly 3. When the drive assembly 4 extends, it pushes the seat cushion sliding support assembly 3 forward; when the drive assembly 4 retracts, it pulls the seat cushion sliding support assembly 3 backward.

[0030] Specifically, in order to solve the problem that existing sofas cannot be placed against a wall and the backrest 200 cannot be completely flush with the seat cushion 100, this solution uses the first end of the linkage mechanism of the backrest lying component 7 as a fixed fulcrum, which is movably connected to the base component 1, and the second end as a drive input end, which is movably connected to the seat cushion sliding support component 3. When the drive component 4 drives the seat cushion sliding support component 3 to slide forward along the slide rail component 2, the seat cushion sliding support component 3 drives the linkage mechanism to move and deform through the second end, so that the backrest mounting part moves downward and folds backward to the lying flat state. Understandably, since the reclining of the backrest 200 is achieved by the deformation of the linkage mechanism, which causes the backrest mounting part to move downward and fold backward, rather than the traditional solution where the backrest 200 flips backward as a whole, there is no need to reserve space behind the backrest 200 for flipping during the reclining process, and the sofa can be placed against the wall. At the same time, after the backrest mounting part moves downward and folds backward to the reclining state, the backrest 200 and the seat cushion 100 are on the same horizontal plane without any angle. Therefore, it achieves zero wall placement and a completely flush reclining with the backrest 200, thus achieving the effect of saving space and improving the comfort of reclining.

[0031] Reference Figures 3a-4b In one embodiment, the linkage mechanism is a deformable quadrilateral linkage mechanism; wherein, when the seat cushion sliding support assembly 3 slides backward to its limit position, the quadrilateral linkage mechanism deforms to a folded form, thereby causing the backrest mounting part to be in a generally vertical state; when the seat cushion sliding support assembly 3 slides forward to its limit position, the quadrilateral linkage mechanism deforms to an unfolded form, thereby causing the backrest mounting part to be in a generally horizontal state.

[0032] Specifically, the quadrilateral linkage mechanism is a preferred implementation of linkage mechanisms, consisting of four links sequentially hinged to form a deformable quadrilateral structure. The four links of the quadrilateral linkage mechanism can all be straight, or may include bent or curved links, and the length ratio of each link can be designed and adjusted according to the actual required motion trajectory. The function of the quadrilateral linkage mechanism is to transform the forward and backward linear sliding of the seat cushion sliding support assembly 3 into the posture switching of the backrest mounting part between vertical and horizontal by deforming the quadrilateral configuration. The quadrilateral linkage mechanism inherits the connection relationship of the first end being movably connected to the base assembly 1 and the second end being movably connected to the seat cushion sliding support assembly 3. Simultaneously, the sequential hinged connection of the four links to form a closed quadrilateral structure ensures that the movements of each link are interconnected and constrained.

[0033] When the seat cushion sliding support assembly 3 slides backward along the slide rail assembly 2 to the limit of its travel, the included angle between adjacent rods of the quadrilateral linkage mechanism decreases, and the overall structure retracts and compresses inward, thereby driving the backrest mounting part to move upward, so that the backrest mounting part ultimately maintains a roughly vertical state, corresponding to the normal sitting posture of the sofa. At this time, the quadrilateral linkage mechanism is in a stable retracted and locked state, which can provide stable support for the vertical backrest 200.

[0034] When the seat cushion sliding support assembly 3 slides forward along the slide rail assembly 2 to its travel limit, the included angle between adjacent rods of the quadrilateral linkage mechanism increases, and the overall structure stretches outward, thereby causing the backrest mounting part to move downward and fold backward, so that the backrest mounting part ultimately maintains a roughly horizontal state. Corresponding to the scenario of the sofa being fully reclined, at this time the quadrilateral linkage mechanism is in a stable unfolded support state, which can provide uniform support force for the horizontal backrest 200 and prevent the backrest 200 from sagging or wobbling.

[0035] Specifically, to ensure more stable and reliable posture switching between sitting and reclining positions for the backrest 200, this design uses a deformable quadrilateral linkage mechanism. Utilizing the stable deformation of the quadrilateral structure between its folded and unfolded forms, the backrest mounting section can precisely switch between a roughly vertical and a roughly horizontal state. Thus, the two extreme forms of the quadrilateral linkage mechanism—folded and unfolded—correspond to the sitting and reclining positions of the backrest 200, respectively. This ensures stable structural support for the backrest 200 in both extreme positions, guaranteeing the reliability of posture switching and the accuracy of positioning. This significantly improves the support stability of the backrest 200 in different postures and effectively optimizes the reliability of the device.

[0036] Reference Figure 3a and Figure 4aIn this embodiment, the quadrilateral linkage mechanism includes a front support rod 71, a rear support rod 72, a backrest mounting rod 73, and a connecting rod 74. The front support rod 71 forms the second end of the linkage mechanism and is hinged to the seat cushion sliding support assembly 3. The front support rod 71 is also hinged to the connecting rod 74 and the rear support rod 72. The rear support rod 72 forms the first end of the linkage mechanism and is hinged to the base assembly 1. The rear support rod 72 is also hinged to the front support rod 71 and the backrest mounting rod 73. The backrest mounting rod 73 forms the backrest mounting part and is hinged to the connecting rod 74 and the rear support rod 72. The connecting rod 74 is hinged to the front support rod 71 and the backrest mounting rod 73. The front support rod 71, the connecting rod 74, the backrest mounting rod 73, and the rear support rod 72 are sequentially hinged to form a quadrilateral structure.

[0037] Specifically, the front support rod 71 is a member of the quadrilateral linkage mechanism. It is long and slender, and can be either straight or bent. The front support rod 71 forms the second end of the linkage mechanism. Its function is to act as a transmission connector between the seat cushion sliding support assembly 3 and the quadrilateral linkage mechanism, transmitting the forward and backward sliding motion of the seat cushion sliding support assembly 3 to the quadrilateral linkage mechanism, driving its deformation. The front support rod 71 is hinged to the seat cushion sliding support assembly 3, and also hinged to the connecting rod 74 and the rear support rod 72. The front support rod 71 establishes motional connections with the seat cushion sliding support assembly 3, the connecting rod 74, and the rear support rod 72 through these three hinge points.

[0038] The rear support rod 72 is another member in the quadrilateral linkage mechanism. It is also slender and can be a straight rod or a rod with bends. The rear support rod 72 forms the first end of the linkage mechanism, serving as a fixed fulcrum between the quadrilateral linkage mechanism and the base assembly 1, providing rotational support during the deformation of the linkage mechanism. The rear support rod 72 is hinged to the base assembly 1, and also hinged to the front support rod 71 and the backrest mounting rod 73. The rear support rod 72 establishes kinematic connections with the base assembly 1, the front support rod 71, and the backrest mounting rod 73 through these three hinge points.

[0039] The backrest mounting rod 73 is a member in the quadrilateral linkage mechanism used to mount the backrest 200. It is slender and can be straight or bent. The backrest mounting rod 73 constitutes the backrest mounting part of the linkage mechanism. Its function is to support the backrest 200 and drive the backrest 200 to change posture when the quadrilateral linkage mechanism deforms. The backrest mounting rod 73 is hinged to both the connecting rod 74 and the rear support rod 72. Through these two hinge points, a kinematic relationship is established between the backrest mounting rod 73 and the connecting rod 74 and the rear support rod 72. When the quadrilateral linkage mechanism deforms, the backrest mounting rod 73 moves downward and folds backward under the combined action of the connecting rod 74 and the rear support rod 72.

[0040] The connecting rod 74 is a member in the quadrilateral linkage mechanism that plays a role in transmission and configuration maintenance. It is slender and can be a straight rod or a rod with bends. The function of the connecting rod 74 is to transmit motion and force between the front support rod 71 and the backrest mounting rod 73, while maintaining the configurational stability of the quadrilateral structure. The connecting rod 74 is hinged to both the front support rod 71 and the backrest mounting rod 73. Through these two hinge points, the motion of the front support rod 71 is transmitted to the backrest mounting rod 73, while maintaining the closed nature of the quadrilateral structure.

[0041] The front support rod 71, connecting rod 74, backrest mounting rod 73 and rear support rod 72 are hinged in sequence to form a quadrilateral structure. This quadrilateral structure is the core configuration of the quadrilateral linkage mechanism. The hinge relationship between each rod allows the quadrilateral structure to undergo controllable deformation under the drive of the seat cushion sliding support assembly 3, thereby realizing the posture change of the backrest mounting rod 73.

[0042] Specifically, to ensure the motion accuracy and structural stability of the quadrilateral linkage mechanism and achieve precise control of the motion trajectory of the backrest mounting rod 73, a closed-loop quadrilateral structure is formed by sequentially hinged four rods: the front support rod 71, the rear support rod 72, the backrest mounting rod 73, and the connecting rod 74. The front support rod 71 receives the power from the seat cushion sliding support assembly 3, acting as the active rod to drive the deformation of the entire structure. Simultaneously, the hinge point between the rear support rod 72 and the base assembly 1 serves as a fixed fulcrum, providing a stable motion reference for the entire structure. The motion is then transmitted between the front support rod 71 and the backrest mounting rod 73 via the connecting rod 74, thus creating a coordinated linkage system among the four rods. This addresses the issue of the backrest 2... The problem of uncontrollable movement trajectory and inability to precisely fold to be flush with the seat cushion 100 can be solved by matching the length of the four rods with the hinge points. This precisely limits the movement trajectory of the backrest mounting rod 73, ensuring that it only completes a downward and backward folding motion during structural deformation, without generating additional displacement behind the device. Therefore, there is no need to reserve space for flipping behind the sofa. At the same time, it ensures that the backrest mounting rod 73 eventually reaches a completely flush horizontal state with the seat cushion 100. It can be seen that through the coordinated hinge of the four rods, the precise linkage between the posture of the backrest 200 and the sliding motion of the seat cushion 100 is achieved, and the stability and reliability of the linkage mechanism during the movement process are greatly improved, further optimizing the use effect of the device.

[0043] Reference Figure 5 and Figure 6 In a specific implementation, one end of the front support rod 71 is hinged to the rear end of the seat cushion sliding support assembly 3; the rod body of the front support rod 71 is hinged to one end of the connecting rod 74; and the other end of the front support rod 71 is hinged to the rear support rod 72. One end of the rear support rod 72 is hinged to the base assembly 1; the rod body of the rear support rod 72 is hinged to the other end of the front support rod 71; and the other end of the rear support rod 72 is hinged to the backrest mounting rod 73. One end of the backrest mounting rod 73 is hinged to the other end of the connecting rod 74, and the body of the backrest mounting rod 73 is hinged to the other end of the rear support rod 72; one end of the connecting rod 74 is hinged to the body of the front support rod 71, and the other end of the connecting rod 74 is hinged to one end of the backrest mounting rod 73; wherein, the segment between the body of the front support rod 71 and its other end, the connecting rod 74, the backrest mounting rod 73, and the segment between the body of the rear support rod 72 and its other end constitute the quadrilateral structure.

[0044] Specifically, the front support rod 71 has three hinge points, namely A1, A2, and A3. Hinge point A1 is located at one end of the front support rod 71 and is hinged to the rear end of the seat cushion sliding support assembly 3. This hinge point allows the front support rod 71 to rotate around the hinge point as the seat cushion sliding support assembly 3 slides back and forth. Hinge point A2 is located on the body of the front support rod 71 and is hinged to one end of the connecting rod 74. This hinge point transmits the movement of the front support rod 71 to the connecting rod 74. Hinge point A3 is located at the other end of the front support rod 71 and is hinged to the rear support rod 72. This hinge point movably connects the front support rod 71 and the rear support rod 72, allowing them to rotate relative to each other.

[0045] The rear support rod 72 has three hinge points, namely B1, B2, and B3. Hinge point B1 is located at one end of the rear support rod 72 and is hinged to the base assembly 1. This hinge point serves as a fixed fulcrum for the rear support rod 72, allowing the rear support rod 72 to rotate around this hinge point. Hinge point B2 is located on the body of the rear support rod 72 and is hinged to hinge point A3 of the front support rod 71. This hinge point allows the other end of the front support rod 71 to be movably connected to the body of the rear support rod 72. When the front support rod 71 is pulled forward, the rear support rod 72 can be rotated around hinge point B1 through this hinge point. Hinge point B3 is located at the other end of the rear support rod 72 and is hinged to the backrest mounting rod 73. This hinge point transmits the movement of the rear support rod 72 to the backrest mounting rod 73.

[0046] The backrest mounting rod 73 has two hinge points, C1 and C2. Hinge point C1 is located at one end of the backrest mounting rod 73 and is hinged to the other end of the connecting rod 74. This hinge point allows the connecting rod 74 to transmit motion to the backrest mounting rod 73. Hinge point C2 is located on the body of the backrest mounting rod 73 and is hinged to hinge point B3 of the rear support rod 72. This hinge point allows the rear support rod 72 to directly drive the backrest mounting rod 73 to move.

[0047] The connecting rod 74 has two hinge points, D1 and D2. Hinge point D1 is located at one end of the connecting rod 74 and is hinged to hinge point A2 of the front support rod 71, which allows the connecting rod 74 to receive movement from the front support rod 71; hinge point D2 is located at the other end of the connecting rod 74 and is hinged to hinge point C1 of the backrest mounting rod 73, which allows the connecting rod 74 to transmit movement to the backrest mounting rod 73.

[0048] It should be noted that the segment between hinge points A2 and A3 of the front support rod 71, the connecting rod 74, the backrest mounting rod 73, and the segment between hinge points B2 and B3 of the rear support rod 72 form a quadrilateral structure, that is, the four hinge points (A2, D1), (A3, B2), (B3, C2), and (C1, D2) enclose this quadrilateral structure. Both the front support rod 71 and the rear support rod 72 are rods with three hinge points. The hinge points on their rods divide the entire rod into two segments. The segments between hinge points A2 and A3 and between hinge points B2 and B3 participate in forming the quadrilateral structure, while the segments between hinge points A1 and A2 and between hinge points B1 and B2 are used to connect to the seat cushion sliding support assembly 3 and the base assembly 1, respectively. This design makes the deformation movement of the quadrilateral structure and its external connection relationship independent yet coordinated.

[0049] Specifically, to make the deformation motion of the quadrilateral linkage mechanism more precise and controllable, this scheme further clarifies the specific positional relationships of the hinge points on each link. Hinge point A1 of the front support rod 71 is hinged to the seat cushion sliding support assembly 3 to receive driving force; hinge point A2 is hinged to the connecting rod 74 to transmit motion; and hinge point A3 is hinged to the rear support rod 72 to establish inter-rod connection. Hinge point B1 of the rear support rod 72 is hinged to the base assembly 1 to provide a fixed fulcrum; hinge point B2 is hinged to hinge point A3 of the front support rod 71 to receive tension from the front support rod 71; and hinge point B3 is hinged to the backrest mounting rod 73. The backrest mounting rod 73 is driven to move. The hinge point C1 of the backrest mounting rod 73 is hinged to the connecting rod 74, and the hinge point C2 is hinged to the rear support rod 72. Thus, the backrest mounting rod 73 can move precisely downward and fold backward under the joint constraint of the connecting rod 74 and the rear support rod 72. The hinge point D1 of the connecting rod 74 is hinged to the front support rod 71, and the hinge point D2 is hinged to the backrest mounting rod 73, transmitting motion between the front support rod 71 and the backrest mounting rod 73. Specifically, a quadrilateral structure is formed by the rod segment between hinge points A2 and A3 of the front support rod 71, the connecting rod 74, the backrest mounting rod 73, and the rod segment between hinge points B2 and B3 of the rear support rod 72. This quadrilateral structure is deformed by sliding back and forth of the seat cushion sliding support assembly 3, thus realizing the precise attitude switching of the backrest mounting rod 73 between vertical and horizontal, ensuring the positioning accuracy and movement stability of the backrest 200 when lying flat.

[0050] Continue to refer to Figure 6Furthermore, a first limiting member 14 is fixedly provided at the rear end of the base assembly 1, and a first support body 15 is provided on the first limiting member 14; a second limiting member 33 is fixedly provided at the rear end of the seat cushion sliding support assembly 3, and a second support body 34 is provided on the second limiting member 33; wherein, when the quadrilateral linkage mechanism is deformed to the unfolded form, the lower end of the rear support rod 72 abuts against the first support body 15, and the lower end of the front support rod 71 abuts against the second support body 34.

[0051] Specifically, the first limiting member 14 is a limiting structure located at the rear end of the base assembly 1, and its shape can be block-shaped, plate-shaped, or column-shaped, or other suitable structural forms. The first limiting member 14 is fixedly installed at the rear end of the base assembly 1, and its function is to provide limiting support for the unfolding deformation of the quadrilateral linkage mechanism. The first limiting member 14 is provided with a first support body 15, which protrudes from the first limiting member 14 and is column-shaped, and can be a cylinder, square column, or other column with a cross-sectional shape. The function of the first support body 15 is to abut against the lower end of the rear support rod 72 when the quadrilateral linkage mechanism is unfolded to its limit position, preventing the rear support rod 72 from continuing to rotate, thereby limiting the unfolded shape of the quadrilateral linkage mechanism.

[0052] The second limiting member 33 is a limiting structure located at the rear end of the seat cushion sliding support assembly 3. Its shape can be block-shaped, plate-shaped, or column-shaped, or other suitable structural forms. The second limiting member 33 is fixedly installed at the rear end of the seat cushion sliding support assembly 3 and slides back and forth with it. A second support body 34 is provided on the second limiting member 33. The second support body 34 protrudes from the second limiting member 33 and is column-shaped, such as a cylinder, square column, or other column with a different cross-sectional shape. The function of the second support body 34 is to abut against the lower end of the front support rod 71 when the quadrilateral linkage mechanism is extended to its limit position, preventing the front support rod 71 from continuing to rotate forward, thereby limiting the extended shape of the quadrilateral linkage mechanism.

[0053] When the quadrilateral linkage mechanism is deformed into the unfolded state, the lower end of the rear support rod 72 abuts against the first support body 15, and the lower end of the front support rod 71 abuts against the second support body 34. Through the simultaneous action of the two abutments, the quadrilateral linkage mechanism is locked in the unfolded state, so that the backrest mounting rod 73 is stably kept in a completely flat state.

[0054] Specifically, to address the issue of uncertain reclining position and lack of support stability in the quadrilateral linkage mechanism when it is deployed, thus affecting the comfort and safety of the reclining position, this solution includes a first limiting member 14 and a first support body 15 at the rear end of the base assembly 1, and a second limiting member 33 and a second support body 34 at the rear end of the seat cushion sliding support assembly 3. When the quadrilateral linkage mechanism is deformed into its deployed state, the lower end of the rear support rod 72 abuts against the first support body 15, and the lower end of the front support rod 71 abuts against the second support body 34. Thus, the quadrilateral linkage mechanism is precisely locked in the fully reclining position of the backrest 200 through these two abutment limiting points. Simultaneously, the first support body 15 and the second support body 34 provide rigid support for the rear support rod 72 and the front support rod 71, transferring the load from the backrest 200 to the base assembly 1 and the seat cushion sliding support assembly 3 through the support bodies. This ensures the positioning accuracy and load-bearing stability of the backrest 200 in the reclining state, improving the user's sense of security and comfort when reclining.

[0055] Reference Figure 1 and Figure 2 as well as Figure 7 In one embodiment, the reclining zero-wall extension device further includes a footrest assembly 5 and a landing gear assembly 6. The footrest assembly 5 is located at the front end of the seat cushion sliding support assembly 3, and the landing gear assembly 6 is connected to the footrest assembly 5 and is used to change to a vertical state as the footrest assembly 5 unfolds to support the footrest assembly 5. The drive assembly 4 is kinetically connected to the footrest assembly 5 and is used to drive the footrest assembly 5 to retract and extend and drive the seat cushion sliding support assembly 3 to slide back and forth on the slide rail assembly 2.

[0056] Specifically, the footrest assembly 5 is a functional component used to support the user's legs. When folded, it fits snugly against the front end of the seat cushion sliding support assembly 3; when unfolded, it extends forward and upward to form a leg support surface. The footrest assembly 5 can be a folding footrest mechanism hinged by multiple connecting rods, a telescopic footrest mechanism, or a flip-up footrest mechanism, or other footrest structures capable of folding and unfolding. The function of the footrest assembly 5 is to provide leg support for the user when unfolded and to fold away for storage to save space when folded. The footrest assembly 5 is located at the front end of the seat cushion sliding support assembly 3 and slides back and forth with it. The footrest assembly 5 is connected to the drive assembly 4, which provides the power for its folding and unfolding.

[0057] The landing gear assembly 6 is a support assembly used in conjunction with the footrest assembly 5. It includes a support for the landing gear and rollers located at the rear end of the support. Structurally, the support for the landing gear can be a single-arm member, a double-arm member, or a triangular frame structure, or any other structure that provides stable support. The function of the landing gear assembly 6 is to provide downward support to the footrest assembly 5 as it extends to a vertical position, preventing the footrest assembly 5 from falling due to its front end being suspended in the air when extended, and also preventing the entire device from tilting forward. The landing gear assembly 6 is connected to the footrest assembly 5. When the footrest assembly 5 extends forward and upward, the landing gear assembly 6 rotates and opens accordingly, supporting itself on the ground; when the footrest assembly 5 retracts, the landing gear assembly 6 rotates and retracts accordingly.

[0058] The drive assembly 4 is connected to the footrest assembly 5, which not only drives the footrest assembly 5 to retract and extend, but also drives the seat cushion sliding support assembly 3 to slide back and forth on the slide rail assembly 2. The retraction and extension of the footrest assembly 5 and the sliding of the seat cushion sliding support assembly 3 are powered by the same drive assembly 4, realizing the linkage between the two.

[0059] Specifically, to achieve a fully reclined backrest (200°) without leaning against a wall while providing comfortable leg support and addressing the safety hazard of the device tilting forward when the footrest is extended, this solution adds a footrest assembly 5 to the front of the seat cushion sliding support assembly 3. A landing gear assembly 6 connected to the footrest assembly 5 is also added, and the footrest assembly 5 is connected to the drive assembly 4. The drive assembly 4 simultaneously drives the footrest assembly 5 to extend and retract, and the seat cushion sliding support assembly 3 to slide back and forth. Thus, a single drive assembly 4 can achieve coordinated control of the three actions: the seat cushion 100 moving forward, the backrest 200 reclining, and the footrest extending and retracting, eliminating the need for a separate power source. This simplifies the overall structure of the device and reduces costs. Simultaneously, the landing gear assembly 6 transforms into a vertical position as the footrest assembly 5 extends, providing reliable downward support and effectively counteracting the downward tendency caused by the front end being suspended in the air. This prevents the device from tilting forward and improves safety and stability during use.

[0060] Continue to refer to Figure 7 In one embodiment, the drive assembly 4 includes an electric push rod 41, a rotating connector 42, and a drive rod 43. The electric push rod 41 is fixedly mounted on the base assembly 1. The drive end of the electric push rod 41 is rotatably connected to one end of the rotating connector 42, and the other end of the rotating connector 42 is fixedly connected to the rod body of the drive rod 43. The shaft end of the drive rod 43 is connected to the foot rest assembly 5. The electric push rod 41 is used to push or pull one end of the rotating connector 42 along the seat depth direction to drive the rotating connector 42 to rotate, thereby causing the drive rod 43 to rotate around its axis, and thus causing the foot rest assembly 5 to unfold or retract.

[0061] Specifically, the electric actuator 41 can be of various types, such as DC electric actuator 41, AC electric actuator 41, or servo electric actuator 41. Its core function is to provide stable and controllable linear power output for the attitude transformation of the entire device, and to achieve precise extension and retraction stroke control, ensuring smooth and stable operation of the device. Its body is firmly fixed to the crossbeam of the base assembly 1 and arranged along the front and rear direction of the device. The extendable drive end faces the front end of the device and forms a rotational connection with the rotating connector 42. It can drive the rotating connector 42 to complete the rotation through its own extension and retraction.

[0062] The rotating connector 42 can be a crank-type connector, a swing-arm type connector, or an adapter plate with a hinge hole. Its core function is to convert the linear telescopic power output by the electric push rod 41 into rotational power and transmit it to the drive rod 43, thereby driving the drive rod 43 to complete the fixed-axis rotation. One end of the rotating connector 42 is rotatably connected to the drive end of the electric push rod 41, and the other end is firmly fixed to the rod body of the drive rod 43. It can rotate around the axis of the drive rod 43 as a circle with the telescopic movement of the electric push rod 41, thereby driving the drive rod 43 to complete the fixed-axis rotation synchronously.

[0063] The drive rod 43 can be a solid rotating shaft, a hollow tubular rotating shaft, or a transmission rod with a connecting end. Its core function is to receive the rotational power transmitted by the rotating connector 42 and transmit the rotational power synchronously to the foot rest assemblies 5 on the left and right sides of the device, so as to drive the foot rest assemblies 5 on both sides to complete the extension and retraction actions synchronously, ensuring the consistency and synchronicity of the actions of the foot rests on both sides. It is arranged laterally along the left and right direction of the device, and the shaft ends at both ends are connected to the foot rest assemblies 5 on the left and right sides respectively. The rod body is firmly fixed to the rotating connector 42 and can rotate around its own axis as the rotating connector 42 swings, thereby driving the foot rest assemblies 5 on both sides to complete the posture change synchronously.

[0064] When the electric push rod 41 extends forward along the seat depth direction, it pushes the end of the rotating connector 42 to move forward, causing the rotating connector 42 to rotate counterclockwise around the axis of the drive rod 43, which in turn drives the drive rod 43 to rotate counterclockwise around its own axis, ultimately causing the foot rest assembly 5 to complete the forward and upward extension and opening action; when the electric push rod 41 retracts backward along the front-back direction, it pulls the end of the rotating connector 42 to move backward, causing the rotating connector 42 to rotate clockwise around the axis of the drive rod 43, which in turn drives the drive rod 43 to rotate clockwise around its own axis, ultimately causing the foot rest assembly 5 to complete the backward folding action.

[0065] Specifically, to address the issues of unstable power transmission, asynchronous extension of the footrests on both sides, frequent jamming and abnormal noises during movement, and inaccurate stroke control in existing sofa drive structures, a three-stage transmission drive structure is adopted, consisting of an electric push rod 41, a rotating connector 42, and a drive rod 43. The electric push rod 41 provides stable and controllable linear power, which is then converted into rotational power through the rotating connector 42. Finally, the rotational power is synchronously transmitted to the footrest components 5 on both sides through the horizontally arranged drive rod 43. The horizontal drive rod 43 ensures that the footrest components 5 on both sides move completely synchronously, avoiding problems such as jamming on one side or inconsistent extension. At the same time, the precise stroke control of the electric push rod 41 enables precise regulation of the device's movements, ensuring smooth and stable posture transitions. Ultimately, this achieves the technical effects of stable power transmission, synchronized and consistent movements, and smooth, jam-free operation, significantly improving the device's operational reliability and user experience.

[0066] Reference Figures 8a-11 In one embodiment, the footrest assembly 5 includes a linkage assembly 51, a first connector 52 for connecting to the front end of the seat cushion sliding support assembly 3, a second connector 53 for connecting to the shaft end of the drive rod 43, a third connector 54 for connecting to the footrest plate 300, and an elastic member 55. The two ends of the linkage assembly 51 are respectively connected to the first connector 52 and the third connector 54, and the linkage assembly 51 is also connected to the second connector 53. The landing gear assembly 6 is rotatably connected to the first connector 52 and the linkage assembly 51. The two ends of the elastic member 55 are respectively connected to the linkage assembly 51 and the landing gear assembly 6, and the elastic member 55 is used to provide elastic tension to tighten the footrest assembly 5 so that it maintains a folded tendency.

[0067] Specifically, the first connector 52 is used to connect the link assembly 51 to the front end of the seat cushion sliding support assembly 3, serving as the connection base between the footrest assembly 5 and the seat cushion sliding support assembly 3. The first connector 52 can be a plate-like structure, a block-like structure, or a frame structure, and its shape is designed according to the connection position and installation space. The first connector 52 and the seat cushion sliding support assembly 3 can be fixedly connected by welding, screw connection, riveting, or snap-fit, and the connection method must ensure that it will not loosen or fall off during use. The first connector 52 can be provided with multiple mounting holes or connecting lugs for hinged connection with the link assembly 51, landing gear assembly 6, etc.

[0068] The second connecting member 53 is used to connect the shaft end of the drive rod 43 to the connecting rod assembly 51, receiving the power transmitted from the drive assembly 4 and transmitting it to the connecting rod assembly 51. The second connecting member 53 can be a rod, rocker arm, or other structure, and its shape is designed according to the connection requirements with the drive rod 43 and the connecting rod assembly 51. The second connecting member 53 can be fixedly connected to the shaft end of the drive rod 43 by means of key connection, spline connection, interference fit, or screw fastening, and can be rotatedly connected to the connecting rod assembly 51 by means of pin hinge or bearing connection, thereby converting the rotational torque into the driving force of the connecting rod assembly 51, driving the connecting rod assembly 51 to complete the attitude change.

[0069] The third connector 54 is used to connect with the footrest 300, providing a direct support surface for the user's legs. The third connector 54 can be a plate structure, frame structure, or box structure, and its shape is designed according to the size of the footrest 300 and the installation method requirements. The third connector 54 and the footrest 300 can be fixedly connected by welding, screw connection, riveting, or snap connection. The third connector 54 is hinged to the linkage assembly 51, allowing the footrest 300 to unfold or retract with the movement of the linkage assembly 51, while providing stable load-bearing for the footrest 300 throughout its entire stroke, ensuring the stability of the footrest 300 during unfolding and retracting.

[0070] The linkage assembly 51 is the core transmission and attitude control component of the footrest assembly 5. It can adopt a multi-link linkage structure such as a planar four-bar linkage or a six-bar linkage, and is composed of multiple sets of hinged metal linkages. Bushings and rolling bearings can be set at the hinges to reduce frictional resistance. It has the characteristics of controllable motion trajectory, smooth transmission, and uniform load. Its core function is to achieve stable power transmission and precise control of the extension and retraction trajectory of the footrest assembly 5 through the linkage of multiple linkages. Its two ends are respectively hinged to the first connecting member 52 and the third connecting member 54, and at the same time, it forms a transmission connection with the second connecting member 53. It can receive the power transmitted by the second connecting member 53. Through the relative rotation of its own linkages, it drives the third connecting member 54 to complete the extension and retraction action changes along the preset trajectory.

[0071] The elastic element 55 is an energy storage element that provides preload and reset force for the foot rest assembly 5. It can be made of various forms such as tension springs, torsion springs, and high-elasticity rubber parts, and is made of spring steel and high-elasticity alloys. It has stable elastic deformation capability and fatigue life. Its core function is to provide continuous elastic preload tension to keep the foot rest assembly 5 in a retracting tendency. At the same time, it controls the action priority of power transmission during the operation of the device to ensure the controllability of the action sequence. Its two ends are fixedly connected to the connecting rod assembly 51 and the landing gear assembly 6, respectively. It can continuously provide elastic tension during the entire stroke of the device, so that the foot rest assembly 5 maintains a retracting tendency when there is no sufficient external force to drive it. At the same time, it controls the priority of power transmission through elastic preload to ensure the stability and controllability of the action sequence of the device.

[0072] The landing gear assembly 6 is rotatably connected to the first connecting member 52 and the linkage assembly 51, and can rotate open and fold in sync with the movement of the linkage assembly 51. The tension of the elastic member 55 acts on both the linkage assembly 51 and the landing gear assembly 6, which can ensure the synchronicity of their movements and the reliability of their reset.

[0073] Specifically, to address the technical challenge of ensuring the smooth unfolding and retraction of the footrest assembly 5 while maintaining its retraction trend, a first connector 52 provides a stable installation base, a second connector 53 precisely receives and transmits the power of the drive assembly 4, a third connector 54 provides a robust load-bearing structure for the footrest 300, a linkage assembly 51 achieves precise control over the footrest's unfolding and retraction trajectory, and an elastic element 55 provides continuous pre-tension to maintain the retraction trend of the footrest assembly 5. This achieves smooth transmission, reliable reset, and precise control of the timing of the footrest assembly 5's movements. The elastic element... The elastic preload of 55 keeps the footrest assembly 5 in a folded state and prevents it from unfolding during the initial start-up of the drive assembly 4. Power is first transmitted to the seat cushion sliding support assembly 3 to move it forward. After the seat cushion 100 slides into place and the backrest 200 is fully flat, the driving force of the drive assembly 4 overcomes the elastic tension and then drives the footrest assembly 5 to unfold smoothly. Therefore, it not only ensures the orderly and controllable timing of the device's actions and avoids action interference, but also solves the problems of unreliable reset and unstable folded state of the footrest assembly 5. Ultimately, it achieves the effects of smooth transmission, reliable reset, controllable action, and safe use.

[0074] Reference Figure 7 and Figure 12In one embodiment, the front end of the base assembly 1 is provided with a front column 11 and a support pulley 12. The support pulley 12 is rotatably mounted on the front column 11. The seat cushion sliding support assembly 3 includes a rear column 31 and a seat cushion support beam 32. The rear column 31 is vertically connected to the slide rail assembly 2. The rear end of the seat cushion support beam 32 is fixedly connected to the top of the rear column 31. The bottom of the front end of the seat cushion support beam 32 rests on the support pulley 12. The footrest assembly 5 is located at the front end of the seat cushion support beam 32.

[0075] The front column 11 can be a welded column fitting, a sheet metal bent column bracket, or a cast-in-place column structure. Its function is to provide a fixed installation base for the support pulley 12 and provide stable vertical support for the front end of the seat support beam 32. It is vertically fixed on the left and right sides of the front end of the base assembly 1, forming a firm rigid connection with the base assembly 1, and providing a stable installation reference for the support pulley 12.

[0076] The support pulley 12 can be made of nylon, rubber or metal bearing. Its function is to provide rolling support for the front end of the seat support beam 32, convert the sliding friction between the seat support beam 32 and the base assembly 1 into rolling friction, greatly reduce sliding resistance and ensure smooth sliding action. It is rotatably mounted on the top of the front column 11 with the wheel surface facing upwards and directly opposite the bottom of the seat support beam 32. It can rotate synchronously with the back and forth sliding of the seat support beam 32 without jamming or abnormal noise.

[0077] The rear column 31 can be a welded column fitting, a sheet metal bent column bracket, or an integrally formed column structure. Its function is to connect the slide rail assembly 2 and the seat support beam 32, provide stable vertical support for the rear end of the seat support beam 32, and simultaneously transmit the sliding power of the slide rail assembly 2 to the seat support beam 32, causing the seat support beam 32 to slide back and forth synchronously. It is vertically fixed on the sliding part of the slide rail assembly 2 and can slide back and forth synchronously with the sliding part. The top is firmly fixed to the rear end of the seat support beam 32, providing stable vertical support for the rear end of the seat support beam 32.

[0078] The cushion support beam 32 can be a beam frame structure formed by welding pipe fittings, a support beam spliced ​​from profiles, or a support frame formed by bending sheet metal. It is the direct load-bearing structure of the sofa cushion 100. Its function is to provide stable support for the sofa cushion 100 throughout the entire range. At the same time, it connects the rear column 31, the support pulley 12 and the footrest assembly 5 to realize the linkage and cooperation of each component. It extends along the front and rear direction of the device. The rear end is firmly fixed to the top of the rear column 31, and the front end extends forward to the front part of the device. The bottom is attached to the wheel surface of the support pulley 12, which provides rolling support throughout the entire process. The front part is provided with the mounting point of the footrest assembly 5 for fixing and installing the footrest assembly 5.

[0079] The rear end of the seat support beam 32 is fixedly connected to the sliding part of the slide rail assembly 2 via the rear end column 31, and the front end is supported on the front end column 11 of the base assembly 1 via the support pulley 12, forming a stable support structure with two points at the front and rear. When the sliding part of the slide rail assembly 2 slides in the front and rear direction, the rear end column 31 can drive the seat support beam 32 to slide back and forth synchronously. During the sliding process, the support pulley 12 rotates synchronously with the movement of the seat support beam 32, converting sliding friction into rolling friction, which greatly reduces sliding resistance. At the same time, the two-point support structure at the front and rear can ensure that the seat support beam 32 has a stable support point throughout the entire sliding stroke, avoiding the problems of shaking or bending deformation.

[0080] Specifically, to address the issues of slippage and noise, front-end wobbling and deformation, poor load-bearing stability, and insufficient support during sliding in the existing seat cushion 100 support structure, the sliding power of the slide rail assembly 2 is synchronously transmitted to the seat cushion support beam 32 via the rear column 31. This ensures that the seat cushion support beam 32 and the slide rail assembly 2 move in complete synchronization. The front column 11 and support pulley 12 provide full-range rolling support for the front end of the seat cushion support beam 32, forming a stable support structure with two points at the front and rear. The support pulley 12 converts sliding friction into rolling friction, significantly reducing sliding resistance and preventing slippage and noise. At the same time, the two-point support ensures that the seat cushion support beam 32 has stable support points throughout the entire sliding stroke, thus effectively preventing the seat cushion support beam 32 from wobbling, bending, and deforming. This significantly improves the load-bearing stability and smoothness of the sliding motion of the seat cushion 100, ultimately achieving smooth sliding, stable support, and strong load-bearing capacity.

[0081] Reference Figures 12-14 In one embodiment, the front column 11 is provided with a pin 13, and the seat support beam 32 is provided with a sliding groove 321. The sliding groove 321 extends from the front end of the seat support beam 32 towards the rear end in the front-rear direction. The pin 13 passes through the sliding groove 321 in the left-right direction. The front end and rear end of the sliding groove 321 are respectively provided with a front stop 322 and a rear stop 323 for blocking the pin 13.

[0082] Specifically, the pin 13 is a cylindrical shaft on the front column 11, extending in the left-right direction. The pin 13 is fixed to the front column 11 and does not move with the sliding of the seat support beam 32. Its function is to serve as a sliding guide and limiting fit for the slide groove 321.

[0083] The slide groove 321 is a long, narrow channel formed on the seat support beam 32, extending from the front end of the seat support beam 32 towards the rear end. The function of the slide groove 321 is to provide sliding space for the pin 13, while simultaneously forming limiting stops through its closed ends. The pin 13 passes through the slide groove 321 in the left-right direction. Since the front upright 11 is fixed while the seat support beam 32 slides back and forth, the pin 13 slides relative to it within the slide groove 321, guiding the back-and-forth movement of the seat support beam 32. The front and rear ends of the slide groove 321 respectively form a front stop 322 and a rear stop 323. These front and rear stops 322 and 323 are closed solid structures at both ends of the slide groove 321, and their function is to block the pin 13. When the seat support beam 32 slides forward to its limit position, the pin 13 contacts and is blocked by the front stop 322 of the slide groove 321, restricting the seat support beam 32 from continuing to slide forward; when the seat support beam 32 slides backward to its limit position, the pin 13 contacts and is blocked by the rear stop 323 of the slide groove 321, restricting the seat support beam 32 from continuing to slide backward.

[0084] Specifically, to address the issues of uncontrollable forward and backward sliding stroke, easy disengagement, or excessive sliding leading to jamming and damage to the seat cushion sliding support assembly 3, this solution incorporates a pin 13 on the front column 11 and a groove 321 extending from the front to the rear on the seat cushion support beam 32. The pin 13 passes through the groove 321 in a left-right direction, and front and rear stops 322 and 323 are formed at the front and rear ends of the groove 321, respectively, to block the pin 13. Thus, when the seat cushion support beam 32 slides forward and backward, the pin 13 slides relative to it within the groove 321, providing guidance. When the sliding reaches its limit, the front stop 322 or rear stop 323 physically blocks the pin 13, precisely limiting the sliding stroke of the seat cushion support beam 32. This prevents excessive sliding or disengagement, ensuring precise control of the sliding stroke and the safe and reliable operation of the mechanism.

[0085] The aforementioned components, through specific connections and cooperation, together form a coordinated and interconnected overall system. The opening and closing process of the reclining, zero-wall-adhesion extendable device of this embodiment will be described in detail below, taking into account the movement relationships of each component.

[0086] like Figure 3a and Figure 3bWhen the device needs to be switched from a sitting to a reclining position, the electric push rod 41 is activated and pushes the rotating connector 42 forward along the seat depth direction. The rotating connector 42 drives the drive rod 43 to rotate around its own axis, and the drive rod 43 transmits power to the footrest assembly 5. In the initial stage of operation, because the elastic element 55 provides tension to keep the footrest assembly 5 in a closed tendency, the footrest assembly 5 will not immediately unfold. The power first pushes the seat cushion sliding support assembly 3 to slide forward along the slide rail assembly 2. While the seat cushion sliding support assembly 3 slides forward, it pulls the front support rod 71 forward. Since one end of the rear support rod 72 is hinged to the base assembly 1 as a fixed fulcrum, the distance between the front support rod 71 and the rear support rod 72 gradually increases, so that the quadrilateral linkage mechanism composed of the front support rod 71, connecting rod 74, backrest mounting rod 73 and rear support rod 72 is gradually stretched and unfolded. The backrest mounting rod 73 moves downward and folds backward, and the backrest 200 gradually flattens out. Figure 4a and Figure 4b When the lower end of the rear support rod 72 abuts against the first support body 15 and the lower end of the front support rod 71 abuts against the second support body 34, the backrest mounting rod 73 reaches a fully flat state and is rigidly supported; simultaneously, the seat cushion support beam 32 slides to the front limit position with the seat cushion sliding support assembly 3, and the pin 13 contacts and limits the contact with the front stop 322 of the slide groove 321. Figure 8a and Figure 8b Subsequently, the electric push rod 41 continues to apply forward thrust, and the footrest assembly 5 overcomes the tension of the elastic element 55 and begins to extend forward and upward to open. The linkage assembly 51 drives the third connecting element 54 and the footrest 300 to unfold. At the same time, the landing gear assembly 6 rotates counterclockwise to open as the footrest assembly 5 unfolds. Its tail end roller supports the ground, providing downward support for the footrest assembly 5, preventing the footrest from falling and the device from tilting forward, thus completing the entire opening process.

[0087] When the device needs to be switched from a reclining position to a sitting position, the electric push rod 41 retracts and pulls the rotating connector 42 backward along the seat depth direction. The rotating connector 42 drives the drive rod 43 to rotate in the opposite direction around its own axis. Under the pulling force of the elastic element 55, the footrest assembly 5 moves before the seat cushion sliding support assembly 3. The footrest assembly 5 retracts and folds backward under the drive rod 43. The linkage assembly 51 drives the third connector 54 and the footrest plate 300 to retract. At the same time, the landing gear assembly 6 retracts clockwise as the footrest assembly 5 retracts, and the rollers leave the support surface. After the footrest assembly 5 is retracted into place, the electric push rod 41 continues to pull backward. The seat cushion sliding support assembly 3 slides backward along the moving rail of the slide rail assembly 2, and at the same time pushes the front support rod 71 to move backward. The distance between the front support rod 71 and the rear support rod 72 gradually decreases. The quadrilateral linkage mechanism is gradually compressed and retracted. The backrest mounting rod 73 moves upward and retracts forward. The backrest 200 gradually returns to the upright sitting position. When the seat support beam 32 slides to the rear limit position and the pin 13 contacts the rear stop 323 of the slide groove 321, the seat sliding support assembly 3 returns to the initial position, and the entire device is fully restored to the sitting posture, completing the folding process.

[0088] Reference Figures 1-16 This invention also provides a sofa bed, including the reclining, zero-wall-adhesion extension device described in the above embodiments. The sofa cushion 100 is laid on the cushion sliding support assembly 3, the backrest 200 is mounted on the backrest mounting part, and the footrest 300 is mounted on the footrest assembly 5. Figure 15 and Figure 16 Because the sofa employs the aforementioned extension mechanism, when the drive assembly 4 extends the extension mechanism, the seat cushion 100 slides forward, the backrest 200 moves downward and folds backward until it is completely flush with the seat cushion 100. Simultaneously, the footrest assembly 5 extends forward, and the backrest 200, seat cushion 100, and footrest 300 together form a continuous and flat support surface, allowing the sofa to be smoothly converted into a sofa bed. Therefore, during the conversion of the sofa into a sofa bed, the backrest 200 does not need to fold backward, achieving zero-wall placement, and the backrest 200 and seat cushion 100 are flush without any angle, providing a comfortable lying experience like a real bed, effectively saving indoor space and improving the quality of rest.

[0089] 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 reclining, zero-wall-adhesion extension device, characterized in that, include: Base assembly; A slide rail assembly is disposed on the base assembly; The seat cushion sliding support assembly is slidably connected to the slide rail assembly and can slide back and forth along the slide rail assembly. A backrest reclining assembly includes a linkage mechanism having a first end movably connected to the base assembly, a second end movably connected to the seat cushion sliding support assembly, and a backrest mounting portion for mounting the backrest. as well as A drive component is mounted on the base assembly and is drivenly connected to the seat cushion sliding support assembly. When the drive assembly drives the seat cushion sliding support assembly to slide forward along the slide rail assembly, the seat cushion sliding support assembly drives the linkage mechanism to move and deform through the second end, causing the backrest mounting part to move downward and fold backward to a flat state.

2. The reclining, zero-wall-adhesion extension device according to claim 1, characterized in that, The linkage mechanism is a deformable quadrilateral linkage mechanism; When the seat cushion sliding support assembly slides backward to its limit position, the quadrilateral linkage mechanism deforms into a folded shape, thereby driving the backrest mounting part to a roughly vertical state. When the seat cushion sliding support assembly slides forward to its limit position, the quadrilateral linkage mechanism deforms into an unfolded form, thereby bringing the backrest mounting part to a roughly horizontal state.

3. The reclining, zero-wall-adhesion extension device according to claim 2, characterized in that, The quadrilateral linkage mechanism includes a front support rod, a rear support rod, a backrest mounting rod, and a connecting rod. The front support rod forms the second end of the linkage mechanism and is hinged to the seat cushion sliding support assembly. The front support rod is also hinged to the connecting rod and the rear support rod. The rear support rod forms the first end of the linkage mechanism and is hinged to the base assembly. The rear support rod is also hinged to the front support rod and the backrest mounting rod. The backrest mounting rod forms the backrest mounting part and is hinged to the connecting rod and the rear support rod. The connecting rod is hinged to the front support rod and the backrest mounting rod. The front support rod, the connecting rod, the backrest mounting rod, and the rear support rod are sequentially hinged to form a quadrilateral structure.

4. The reclining, zero-wall-adhesion extension device according to claim 3, characterized in that, One end of the front support rod is hinged to the rear end of the seat cushion sliding support assembly, the rod body of the front support rod is hinged to one end of the connecting rod, and the other end of the front support rod is hinged to the rear support rod. One end of the rear support rod is hinged to the base assembly, the body of the rear support rod is hinged to the other end of the front support rod, and the other end of the rear support rod is hinged to the backrest mounting rod. One end of the backrest mounting rod is hinged to the other end of the connecting rod, and the body of the backrest mounting rod is hinged to the other end of the rear support rod. One end of the connecting rod is hinged to the body of the front support rod, and the other end of the connecting rod is hinged to one end of the backrest mounting rod; The quadrilateral structure is formed by the segment between the front support rod and its other end, the connecting rod, the backrest mounting rod, and the segment between the rear support rod and its other end.

5. The reclining, zero-wall-adhesion extension device according to claim 3, characterized in that, The rear end of the base assembly is fixedly provided with a first limiting member, and the first limiting member is provided with a first support body; the rear end of the seat cushion sliding support assembly is fixedly provided with a second limiting member, and the second limiting member is provided with a second support body. When the quadrilateral linkage mechanism is deformed into its unfolded form, the lower end of the rear support rod abuts against the first support body, and the lower end of the front support rod abuts against the second support body.

6. The reclining, zero-wall-adhesion extension device according to claim 1, characterized in that, It also includes a footrest assembly and a landing gear assembly. The footrest assembly is located at the front end of the seat cushion sliding support assembly. The landing gear assembly is connected to the footrest assembly and is used to change to a vertical state as the footrest assembly unfolds to support the footrest assembly. The drive assembly is kinetically connected to the footrest assembly and is used to drive the footrest assembly to retract and extend, and to drive the seat cushion sliding support assembly to slide back and forth on the slide rail assembly.

7. The reclining, zero-wall-adhesion extension device according to claim 6, characterized in that, The drive assembly includes an electric push rod, a rotating connector, and a drive rod. The electric push rod is fixed to the base assembly. The drive end of the electric push rod is rotatably connected to one end of the rotating connector, and the other end of the rotating connector is fixedly connected to the rod body of the drive rod. The shaft end of the drive rod is connected to the foot rest assembly. The electric push rod is used to push or pull one end of the rotating connector along the seat depth direction to drive the rotating connector to rotate, thereby causing the drive rod to rotate around its axis, and thus causing the foot rest assembly to unfold or retract.

8. The reclining, zero-wall-adhesion extension device according to claim 6, characterized in that, The footrest assembly includes a linkage assembly, a first connector for connecting to the front end of the seat cushion sliding support assembly, a second connector for connecting to the shaft end of the drive rod, a third connector for connecting to the footrest plate, and an elastic element. The two ends of the linkage assembly are respectively connected to the first connector and the third connector, and the linkage assembly is also connected to the second connector. The landing gear assembly is rotatably connected to the first connector and the linkage assembly. The two ends of the elastic element are respectively connected to the linkage assembly and the landing gear assembly. The elastic element is used to provide elastic tension to tighten the footrest assembly so that it maintains a folded-in tendency.

9. The reclining, zero-wall-adhesion extension device according to claim 6, characterized in that, The base assembly has a front column and a support pulley at its front end. The support pulley is rotatably mounted on the front column. The seat cushion sliding support assembly includes a rear column and a seat cushion support beam. The rear column is vertically connected to the slide rail assembly. The rear end of the seat cushion support beam is fixedly connected to the top of the rear column. The bottom of the front end of the seat cushion support beam rests on the support pulley. The footrest assembly is located at the front end of the seat cushion support beam.

10. The reclining, zero-wall-adhesion extension device according to claim 9, characterized in that, The front column is provided with a pin, and the seat support beam is provided with a sliding groove. The sliding groove extends from the front end of the seat support beam in the front-to-back direction to the rear end. The pin passes through the sliding groove in the left-to-right direction. The front end and rear end of the sliding groove are respectively provided with a front stop and a rear stop for blocking the pin.

11. A sofa bed, characterized in that, Includes the reclining zero-wall extension device as described in any one of claims 1-10.

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