Coupling mechanism and seating

Abstract

Coupling mechanism comprising a seat frame (1), a leg rest (8) and a backrest support (7), wherein the coupling mechanism further a sled (4) which is slidably connected to the seat frame (1); a linkage arrangement for the backrest (2) which is connected to the backrest support (7), the seat frame (1) and the slide (4) so ​​that the backrest support (7) is coupled to the slide (4) to move relative to the seat frame (1); a linkage mechanism for the leg rest (3) which is connected to the carriage (4) and the leg rest (8) so that the leg rest (8) can move towards or away from the carriage (4); a coupling arrangement (6) rotatably connected to the slide (4), wherein one end of the coupling arrangement (6) is pivotally connected to the seat frame (1) and the other end of the coupling arrangement (6) is pivotally connected to the linkage mechanism for the leg rest (3); a drive arrangement connected to the carriage (4) to drive the leg rest (8) and the backrest support (7), so that the leg rest (8) and the backrest support (7) move relative to the seat frame (1); includes wherein in operation of the drive arrangement the carriage (4) moves relative to the seat frame (1) and the leg rest (8) and the backrest support (7) move and rotate relative to the seat frame (1), wherein the backrest linkage assembly (2) comprises a first backrest linkage (21), a second backrest linkage (22) and a third backrest linkage (23), wherein one end of the first backrest linkage (21) is pivotally connected to the backrest support (7) and the other end of the first backrest linkage (21) is pivotally connected to the seat frame (1), wherein one end of the second backrest linkage (22) is also pivotally connected to the backrest support (7) and the other end of the second backrest linkage (22) is pivotally connected to the seat frame (1), wherein one end of the third backrest linkage (23) is pivotally connected to the second backrest linkage (22) and the other end of the third backrest linkage (23) is pivotally connected to the slide (4). are, wherein the first linkage is for the backrest (21), the backrest support (7),the second linkage for the backrest (22) and the seat frame (1) are articulated to each other to form a planar quadrilateral joint mechanism.

Description

Technical area

[0001] The application relates to the area of ​​home furnishings, in particular to a coupling mechanism and a piece of seating furniture. State of the art

[0002] As the home furnishing industry evolves, seating furniture faces increasingly higher functional demands. With current adjustable sofas, the synchronous extension and retraction of the backrest and leg rest cannot be achieved using a single drive unit. This is because only one backrest and leg rest can be moved first, followed by the other, making synchronous extension and retraction impossible. To enable synchronous extension and retraction, each backrest and leg rest must have its own dedicated drive unit. Two drive units are controlled by a single switch to achieve this synchronous movement. This necessitates an additional drive unit and increases the sofa's cost.

[0003] US Patent 5,823,614 A discloses a piece of reclining furniture with a reclining mechanism featuring a roller and rail system that significantly reduces the number of connections and has little to no contact with the wall. A movable seat is provided, mounted on rollers that move along angled rail sections. These rollers form the primary connection between the movable seat and the stationary base. At least one of the rails has two angled sections. The first angled section slopes downward from back to front, and the second section slopes upward from back to front. A backrest connection is also provided, allowing the backrest to tilt relative to the seat during the reclining motion.The footrest connection is linked to the front of the mechanism and allows it to be extended and retracted when switching between a fully upright and a reclined television position. Contents of the invention

[0004] To solve the aforementioned technical problems, a coupling mechanism and a seating unit are provided in which the leg rest and backrest support are synchronously driven by a single drive source, extending and retracting synchronously so that the assembly is not complicated and the cost of the product is reduced.

[0005] The first aspect is a coupling mechanism, comprising a seat frame, a leg rest and a backrest support, the coupling mechanism further comprising a slide which is slidably connected to the seat frame; a linkage arrangement for the backrest, which is connected to the backrest support, the seat frame and the slide, so that the backrest support is coupled to the slide to move relative to the seat frame; a linkage mechanism for the leg rest, which is connected to the carriage and the leg rest so that the leg rest can move towards or away from the carriage; a coupling arrangement rotatably connected to the slide, wherein one end of the coupling arrangement is pivotally connected to the seat frame and the other end of the coupling arrangement is pivotally connected to the linkage mechanism for the leg rest; a drive assembly connected to the carriage to drive the leg rest and backrest support so that the leg rest and backrest support move relative to the seat frame; includes in the operation of the drive arrangement the carriage moves relative to the seat frame and the leg rest and backrest bracket move and rotate relative to the seat frame.

[0006] Due to the aforementioned technical solution, the carriage and coupling assembly connect the linkage mechanism for the leg rest and the linkage assembly for the backrest. The linkage mechanism for the leg rest is connected to the leg rest, and the linkage assembly for the backrest is connected to the backrest support, allowing the leg rest and backrest support to be driven by a single drive source, extending and retracting synchronously. This achieves smooth posture adjustment and eliminates the jerky feel of traditional sofa adjustments.

[0007] In connection with the first aspect, a further development provides that the drive arrangement is arranged between the slide and the seat frame, wherein the drive arrangement is designed to drive the slide so that the slide can move relative to the seat frame, wherein, when moving, the slide takes the leg rest and the backrest support along via the linkage mechanism for the leg rest, the coupling arrangement and the linkage arrangement for the backrest, so that the leg rest and the backrest support can move and rotate relative to the seat frame.

[0008] Due to the aforementioned technical solution, the drive assembly is positioned between the carriage and the seat frame. The carriage is driven to move relative to the seat frame, thus synchronizing the movement of the leg rest linkage, the coupling assembly, and the backrest linkage, allowing the leg rest and backrest support to extend and retract synchronously.

[0009] In connection with the first aspect, a further development provides that the drive arrangement is arranged between the slide and the linkage mechanism for the leg rest, wherein the drive arrangement is designed to drive the linkage mechanism for the leg rest so that the linkage mechanism for the leg rest rotates relative to the slide, wherein, when rotating, the linkage mechanism for the leg rest takes the slide, the leg rest and the backrest support with it via the coupling arrangement and the linkage arrangement for the backrest, so that the slide moves relative to the seat frame and moves and rotates the leg rest and the backrest support relative to the seat frame.

[0010] Due to the aforementioned technical solution, the drive assembly is positioned between the carriage and the linkage mechanism for the leg rest. The linkage mechanism for the leg rest is driven to move, which in turn drives the coupling assembly to move, and the coupling assembly, in turn, drives the carriage to move relative to the seat frame, and thus drives the linkage assembly for the backrest to rotate, allowing the leg rest and backrest support to extend and retract synchronously.

[0011] In connection with the first aspect, the embodiment according to the invention provides that the linkage arrangement for the backrest comprises a first linkage for the backrest, a second linkage for the backrest, and a third linkage for the backrest, wherein one end of the first linkage for the backrest is pivotally connected to the backrest support and the other end of the first linkage for the backrest is pivotally connected to the seat frame, wherein one end of the second linkage for the backrest is also pivotally connected to the backrest support and the other end of the second linkage for the backrest is pivotally connected to the seat frame, wherein one end of the third linkage for the backrest is pivotally connected to the second linkage for the backrest and the other end of the third linkage for the backrest is pivotally connected to the slide, wherein the first linkage for the backrest, the backrest support,The second linkage for the backrest and the seat frame are articulated together to form a planar quadrilateral joint mechanism.

[0012] Due to the aforementioned technical solution, the coupling of the second backrest linkage to the slide is achieved via the third backrest linkage. The first backrest linkage, the backrest support, the second backrest linkage, and the seat frame are articulated together to form a double rocker arm of a planar quadrant joint, thereby synchronizing the movement and rotation of the backrest support and the slide.

[0013] In connection with the first aspect, a further development provides that the coupling arrangement comprises a first coupling rod, a second coupling rod and a third coupling rod, wherein the second coupling rod is pivotally connected to the slide and one end of the second coupling rod is pivotally connected to the first coupling rod and the other end of the second coupling rod is pivotally connected to the third coupling rod, wherein an end of the first coupling rod furthest from the second coupling rod is pivotally connected to the linkage arrangement for the backrest, and wherein an end of the third coupling rod furthest from the second coupling rod is pivotally connected to the linkage mechanism for the leg rest.

[0014] Due to the aforementioned technical solution, the articulated connection of the second coupling rod to the slide allows the second coupling rod to rotate relative to the slide while moving with it. The second coupling rod engages the linkage assembly for the backrest via the first coupling rod and the linkage mechanism for the leg rest via the third coupling rod, thus ensuring that the leg rest and backrest support extend and retract synchronously.

[0015] In connection with the first aspect, a further development provides that the linkage mechanism for the leg rest comprises a linkage assembly for the leg rest, a support and a connecting rod, wherein one end of the linkage assembly for the leg rest is pivotally connected to the slide and the other end of the linkage assembly for the leg rest is pivotally connected to the support, wherein the leg rest is pivotally connected to the linkage assembly for the leg rest, and wherein one end of the connecting rod is pivotally connected to the support and the other end of the connecting rod is pivotally connected to the leg rest.

[0016] Due to the aforementioned technical solution, the leg rest linkage can move the leg rest along with it, allowing the leg rest to move synchronously. The support and connecting rod drive the leg rest to rotate relative to the leg rest linkage as it moves with it. In this way, the leg rest can move towards or away from the carriage while rotating relative to the leg rest linkage, thus providing better support for the user's legs.

[0017] In connection with the first aspect, a further development provides that the linkage arrangement for the leg rest comprises a first linkage for the leg rest, a second linkage for the leg rest, a third linkage for the leg rest, and a fourth linkage for the leg rest, wherein a first end of the first linkage for the leg rest is pivotally connected to the slide, while a second end of the first linkage for the leg rest is pivotally connected to the second linkage for the leg rest, wherein an end of the second linkage for the leg rest remote from the first linkage for the leg rest is pivotally connected to an end of the leg rest, wherein an end of the third linkage for the leg rest is pivotally connected to the slide, while another end of the third linkage for the leg rest is pivotally connected to the fourth linkage for the leg rest.wherein an end of the fourth leg support rod, located away from the third leg support rod, is articulated to the support, and the fourth leg support rod is articulated in its middle to a middle of the first leg support rod.

[0018] Due to the aforementioned technical solution, the connecting structure of the first leg support rod, the second leg support rod, the third leg support rod, and the fourth leg support rod allows the leg support to rotate relative to the carriage, even when the leg support is moved towards or away from the carriage, thus enabling the leg support to move away from or towards the carriage and be stowed underneath it.

[0019] In connection with the first aspect, a further development provides that the support is also articulatedly connected to the second linkage for the leg rest at a pivot point, wherein the pivot point is located near the pivot point between the leg rest and the second linkage for the leg rest, wherein a pivot point between the connecting rod and the leg rest is located near the pivot point between the leg rest and the second linkage for the leg rest, and wherein the support, the connecting rod, the leg rest and the second linkage for the leg rest are articulatedly connected to each other to form a planar square joint mechanism.

[0020] Due to the aforementioned technical solution, the support is articulated to the second leg rest and fourth leg rest arms, respectively, allowing the support to rotate relative to the leg rest arm assembly as it moves with the assembly. This rotation assists the leg rest in supporting the user's legs. The pivot point between the support and the second leg rest arm is located close to the pivot point between the leg rest and the second leg rest arm. Similarly, the pivot point between the connecting rod and the leg rest is located close to the pivot point between the leg rest and the second leg rest arm.The support, the connecting rod, the leg rest and the second linkage for the leg rest are articulated to each other to form a planar quadrilateral joint mechanism, whereby, in a state where the linkage assembly for the leg rest is fully extended, the support surfaces of the leg rest and the support can lie essentially in one plane to support the user's legs planarly and increase the comfort of the leg support.

[0021] In connection with the first aspect, a further development provides that the drive arrangement comprises a drive and a drive rod, wherein the drive comprises a fixed end and a drive end, one of which is connected to the carriage, while another of which is eccentrically pivotally connected to the drive rod by the fixed end and the drive end, and wherein the drive rod is rigidly connected to the linkage mechanism for the leg rest.

[0022] Due to the aforementioned technical solution, the drive end of the actuator can move telescopically relative to the fixed end, thus driving the leg rest linkage mechanism. The actuator eccentrically drives the drive rod, allowing it to rotate. This rotation of the drive rod moves the leg rest linkage mechanism, enabling the leg rest and backrest support to extend and retract synchronously.

[0023] In the second aspect, a piece of seating furniture is provided which includes a coupling mechanism according to the first aspect in the embodiment according to the invention.

[0024] Due to the aforementioned technical solution, the synchronized movement and rotation of the leg rest and backrest support is made possible with a single drive source, resulting in a simple design and low costs, and can also reduce the space requirements and weight of the entire seating furniture.

[0025] In summary, at least one of the following advantageous technical effects is achieved: 1. In the coupling mechanism according to the invention, the conventional structure of several drive sources used for the synchronized extension and retraction of the leg rest and the backrest support is modified. According to the invention, the synchronized extension and retraction of the leg rest and the backrest support is achieved by a single drive source, resulting in a simple, compact, and relatively lightweight product. 2. In the seating furniture according to the invention, the synchronized movement and rotation of the leg rest and the backrest support are achieved via a single drive source. This simplifies the driver program and the overall design. Costs are reduced. The space requirement and weight of the entire seating furniture can be decreased. Brief description of the drawings Fig. Figure 1 schematically shows the structure of the coupling mechanism in the seated position according to a first embodiment of the application; Fig. Figure 2 schematically shows the structure of the coupling mechanism in the lying position according to the first embodiment of the application; Fig. Figure 3 schematically shows the structure of the coupling mechanism in the intermediate position according to the first embodiment of the application; Fig. Figure 4 schematically shows the structure of the coupling mechanism in the seated position according to a second embodiment of the application; Fig. Figure 5 schematically shows the structure of the coupling mechanism in the lying position according to the second embodiment of the application; Fig. Figure 6 schematically shows the structure of the coupling mechanism in the intermediate position according to the second embodiment of the application; Fig. Figure 7 schematically shows the structure of the coupling mechanism in the seated position according to a third embodiment of the application; Fig. Figure 8 schematically shows the structure of the coupling mechanism in the lying position according to the third embodiment of the application; Fig. Figure 9 schematically shows the structure of the coupling mechanism in the intermediate position according to the third embodiment of the application; Fig. Figure 10 schematically shows the structure of the coupling mechanism in the seated position according to the fourth embodiment of the application; Fig. Figure 11 schematically shows the structure of the coupling mechanism in the lying position according to the fourth embodiment of the application. Detailed description of the drawings

[0026] To clarify the tasks, technical solutions, and advantages of the embodiments of the invention, the invention is described in more detail below with reference to the accompanying drawings. The assembly of the embodiments of the invention described and illustrated in the drawings can normally be arranged and designed in various configurations. Based on the embodiments of the invention, all other embodiments that a person skilled in the art in this field could obtain without creative effort fall within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters in the following drawings represent similar elements. Therefore, if an element is defined in one drawing, no further definition or explanation is required in the subsequent drawings. In describing the invention, it should be noted that the terms "installation," "connection," and "connection" are to be understood in a broad sense unless otherwise clearly specified and defined. For example, it may refer to a fixed connection, a detachable connection, or a one-piece connection. It may be a mechanical connection or an electrical connection. It may be a direct connection or an indirect connection via an intermediate medium. It may be an internal connection between two elements. The specific meanings of the aforementioned terms in the invention are understandable to the person skilled in the art, depending on the context.In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "top", "bottom", "left", "right", etc., refers to the orientation or positional relationship shown in the drawings and serves only to facilitate and simplify the description of the present application, which does not indicate or suggest that the device or element in question must have a specific orientation, be constructed and operated in a particular manner, and therefore cannot be understood as a limitation of the present application.

[0028] Some embodiments of the invention are described in detail below with reference to the accompanying drawings. Features in the embodiments described below can be combined without conflict.

[0029] The coupling mechanism of conventional seating furniture comprises two drives. These two drives each power the frame assembly for the backrest and the frame mechanism for the leg rest, respectively, to move the backrest frame assembly and the leg rest mechanism. Conventional seating furniture is typically sofas or recliners. Adjusting to different seating positions requires two drive mechanisms and control systems. The design is complex, the cost is high, and the adjustment is cumbersome. Example 1

[0030] Fig. 1 to Fig. Figure 3 schematically shows the structure of an exemplary embodiment of the coupling mechanism.

[0031] The coupling mechanism can assume a sitting position and a lying position. Fig. Figure 1 schematically shows the structure of the coupling mechanism in the seated position. The coupling mechanism comprises a seat frame 1, a leg rest 8, a backrest support 7, a slide 4, a linkage assembly for the backrest 2, a linkage mechanism for the leg rest 3, a coupling assembly 6, and a drive assembly. The slide 4 is slidably connected to the seat frame 1. The linkage assembly for the backrest 2 is connected to the backrest support 7, the seat frame 1, and the slide 4, coupling the backrest support 7 to the slide 4 so that it can move relative to the seat frame 1. The linkage mechanism for the leg rest 3 is connected to the slide 4 and the leg rest 8 to move the leg rest 8 towards or away from the slide 4.The coupling assembly 6 is rotatably connected to the slide 4, and two ends of the coupling assembly 6 are each pivotally connected to the seat frame 1 and the linkage mechanism for the leg rest 3. The drive assembly is connected to the slide 4 to drive the leg rest 8 and the backrest support 7 to move relative to the seat frame 1. During operation of the drive assembly, the slide 4 moves relative to the seat frame 1, and the leg rest 8 and the backrest support 7 move and rotate relative to the seat frame 1.

[0032] The drive assembly comprises a drive 5. The drive 5 is arranged between the carriage 4 and the seat frame 1. The drive 5 is designed to drive the carriage 4 so that it moves relative to the seat frame 1. As the carriage 4 moves, the leg rest 8 and backrest support 7 are driven along with it, via the linkage mechanism for the leg rest 3, the coupling assembly 6, and the linkage assembly for the backrest 2, to move and rotate relative to the seat frame 1. Depending on the requirements and functions of the product, the drive 5 can be designed as a linear motor, an electric push rod, or another pneumatic or hydraulic drive mechanism.

[0033] In the seated position, the linkage mechanism for the leg rest 3 is located under the seat frame 1 and the slide 4, while the linkage arrangement for the backrest 2 is folded so that it is essentially perpendicular to the seat frame 1.

[0034] In relation to Fig. 2 and Fig. The linkage assembly for the backrest 2 comprises a first linkage for the backrest 21, a second linkage for the backrest 22, and a third linkage for the backrest 23. Two ends of the first linkage for the backrest 21 are each pivotally connected to the backrest support 7 and the seat frame 1, while two ends of the second linkage for the backrest 22 are also each pivotally connected to the backrest support 7 and the seat frame 1. Two ends of the third linkage for the backrest 23 are each pivotally connected to the second linkage for the backrest 22 and the slide 4. The first linkage for the backrest 21, the backrest support 7, the second linkage for the backrest 22, and the seat frame 1 are pivotally connected to each other to form a planar quadrilateral joint.The pivot point between the third linkage for the backrest 23 and the second linkage for the backrest 22 is located in the middle of the second linkage for the backrest 22 and near the pivot point between the second linkage for the backrest 22 and the backrest support 7.

[0035] The coupling arrangement 6 comprises a first coupling rod 61, a second coupling rod 62, and a third coupling rod 63. The second coupling rod 62 is pivotally connected to the slide 4 at its midpoint, with two ends of the second coupling rod 62 pivotally connected to the first coupling rod 61 and the third coupling rod 63, respectively. The end of the first coupling rod 61 furthest from the second coupling rod 62 is pivotally connected to the seat frame 1. The end of the third coupling rod 63 furthest from the second coupling rod 62 is pivotally connected to the third leg rest linkage 33 of the leg rest linkage mechanism 3, the pivot point of which is located near the pivot point between the third leg rest linkage 33 and the slide 4.

[0036] The linkage mechanism for the leg rest 3 comprises a leg rest linkage assembly, a support 35, and a connecting rod 36. The leg rest linkage assembly includes a first leg rest linkage 31, a second leg rest linkage 32, a third leg rest linkage 33, and a fourth leg rest linkage 34. One end of the first leg rest linkage 31 is pivotally connected to the slide 4, while the other end of the first leg rest linkage is pivotally connected to the second leg rest linkage 32. The end of the second leg rest linkage 32 furthest from the first leg rest linkage 31 is pivotally connected to one end of the leg rest 8. One end of the third linkage for the leg rest 33 is articulated to the slide 4, while the other end of the third linkage for the leg rest is articulated to the fourth linkage for the leg rest 34.The end of the fourth linkage for the leg rest 34 furthest from the third linkage for the leg rest 33 is pivotally connected to the support 35. The midpoint of the fourth linkage for the leg rest 34 is pivotally connected to the midpoint of the first linkage for the leg rest 31. The support 35 is also pivotally connected to the second linkage for the leg rest 32, the pivot point of which is located near the pivot point of the leg rest 8 with the second linkage for the leg rest 32. The pivot point of the connecting rod 36 with the leg rest linkage is located near the pivot point of the leg rest 8 with the second linkage for the leg rest 32. The support 35, the connecting rod 36, the leg rest 8, and the second linkage for the leg rest 32 are pivotally connected to each other to form a planar square-joint mechanism.

[0037] During the transition between the sitting and reclining positions, the drive 5 propels the carriage 4 to move relative to the seat frame 1. As the second coupling rod 62 moves through the carriage 4, the first coupling rod 61 pulls the second coupling rod 62 to rotate. The second coupling rod 62 pushes the third coupling rod 63 to move. The third coupling rod 63 pushes the leg rest linkage 3 to rotate from its position below the seat frame 1 upwards and outwards. As the leg rest linkage 3 moves, the support 35 is engaged by the third leg rest linkage 33 and the second leg rest linkage 32, causing it to rotate as well. At the same time, the leg rest 8 rotates relative to the second linkage for the leg rest 32 under the combined action of the second linkage for the leg rest 32, the support 35 and the connecting rod.

[0038] Fig. Figure 2 schematically shows the structure of the coupling mechanism according to the invention in the reclining position. In the reclining position, the linkage mechanism for the leg rest 3 rotates relative to the slide 4 to move forward and upward away from the slide 4. The leg rest 8 rotates upward relative to the second linkage for the leg rest 32 until it lies approximately in the same plane as the support 35. The linkage assembly for the backrest 2 rotates relative to the seat frame 1, taking the slide 4 with it. The backrest support 7 rotates from a state in which it is approximately perpendicular to the seat frame 1 to a state in which it is inclined at an angle to the seat frame 1. The drive assembly includes a drive 5. In the present embodiment, the drive 5 is an electric pushrod. Depending on the design requirements, the electric element can be a linear motor, a pneumatic drive 5, or a hydraulic drive 5.The drive 5 comprises a fixed end 51 and a drive end 52. The fixed end 51 is equipped with a drive motor that can drive the drive end 52 so that it moves linearly relative to the fixed end 51. In the present embodiment, the fixed end 51 is connected to the seat frame 1, with the drive end 52 being rotatably, and in particular pivotably, connected to the slide 4. Depending on the structural requirements, the fixed end 51 can be rigidly connected to the seat frame 1 or pivotally connected to the seat frame 1. In the present embodiment, a pivot connection is used.

[0039] In relation to Fig. There is an intermediate position between the sitting and reclining positions. In this state, the leg rest linkage 3 is rotated upwards and forwards at a certain angle relative to the seat frame 1, but is not fully extended. The leg rest 8 does not rotate relative to the second leg rest linkage 32, and both the leg rest 8 and the second leg rest linkage 32 are in a folded position. When the backrest linkage 2 is rotated at an angle relative to the seat frame 1, the backrest support 7 is also rotated at an angle relative to the seat frame 1 by the backrest linkage 2. The first coupling rod 61, the second coupling rod 62, and the third coupling rod 63 of the coupling assembly 6 are articulated together in a small Z-shape. Example 2

[0040] Fig. 4 to Fig. Figure 6 shows by way of example the structure of the coupling mechanism according to the second embodiment of the application, which differs from the first embodiment in that the first coupling rod 61 is a long rod.

[0041] Fig. Figure 4 schematically shows the structure of the coupling mechanism according to the invention in the seated position. In the seated position, the linkage mechanism for the leg rest 3 is located under the seat frame 1 and the slide 4. The linkage assembly for the backrest 2 is folded so that it is approximately perpendicular to the seat frame 1.

[0042] Fig. Figure 5 schematically shows the structure of the coupling mechanism of the registration in the reclining position. In the reclining position, the linkage mechanism for the leg rest 3 is rotated relative to the slide 4 to move forward and upward away from the slide 4, and the leg rest 8 is rotated upward relative to the second linkage for the leg rest 32 so that it lies approximately in the same plane as the support 35. The linkage assembly for the backrest 2 rotates relative to the seat frame 1, taking the slide 4 with it, so that the backrest support 7 rotates from a state in which it is approximately perpendicular to the seat frame 1 to a state in which it is inclined at an angle to the seat frame 1.

[0043] In relation to Fig. In this intermediate position, there is an intermediate position between the sitting and reclining positions. In this intermediate position, the leg rest mechanism 3 is rotated upwards and forwards at an angle relative to the seat frame 1, but is not fully extended. The leg rest 8 is not yet rotated and is in a folded state relative to the second leg rest linkage 32. When the backrest linkage 2 is rotated at an angle relative to the seat frame 1, the backrest support 7 is also rotated at an angle relative to the seat frame 1, taking the backrest linkage 2 with it. The first coupling rod 61, the second coupling rod 62, and the third coupling rod 63 of the coupling assembly 6 are articulated together to form a large Z-shape.

[0044] In relation to Fig. 5 and Fig. The linkage mechanism for the leg rest 3 also comprises a first linkage for the leg rest 31, a second linkage for the leg rest 32, a third linkage for the leg rest 33, a fourth linkage for the leg rest 34, a support 35, and a connecting rod 36, as in the first embodiment, wherein the construction and connection of the linkage mechanism for the leg rest 3, the leg rest 8, and the slide 4 are also identical to those in the first embodiment. The coupling arrangement 6 also comprises a first coupling rod 61, a second coupling rod 62, and a third coupling rod 63, wherein the connecting structures are also approximately the same.The linkage assembly for the backrest 2 also includes a first linkage for the backrest 21, a second linkage for the backrest 22, and a third linkage for the backrest 23, wherein the structures and connection methods of the linkage assembly for the backrest 2, the backrest support 7, and the seat frame 1 are also identical. The drive 5 is also arranged between the seat frame 1 and the slide 4.

[0045] Unlike the first embodiment, the first coupling rod 61 is designed as a long rod. During the transition from the sitting position to the reclining position, the rotational speed at which the linkage mechanism for the leg rest 3 rotates forward and upward from its position below the seat frame 1 can vary. Depending on the design requirements, different structural solutions for the first coupling rod 61 can be selected. Example 3

[0046] With reference to Fig. 7 to Fig. 9. The difference between the present embodiment and the first embodiment is that the drive 5 is arranged between the slide 4 and the linkage mechanism for the leg rest 3. The drive 5 is connected to the linkage mechanism for the leg rest 3 via the drive rod 53. In the present embodiment, the drive rod 53 is fixedly connected to the first linkage for the leg rest 31, with the drive end 52 of the drive 5 being pivotably connected to the drive rod 53 eccentrically. The drive 5 moves the coupling assembly 6 by driving the linkage mechanism for the leg rest 3. The movement of the coupling assembly 6 causes the slide 4 to move relative to the seat frame 1, thus rotating the linkage assembly for the backrest 2, so that the leg rest 8 and the backrest support 7 can extend and retract synchronously.

[0047] Fig. Figure 7 schematically shows the structure of the coupling mechanism according to the invention in the seated position. Fig. Figure 8 schematically shows the structure of the coupling mechanism according to the invention in the lying position. Fig. Figure 9 schematically shows the structure of the coupling mechanism according to the invention in the intermediate position. These are identical to those in the first embodiment and are not described again. Example 4

[0048] With reference to Fig. 10 and Fig. 11. The difference from the second embodiment is that the drive 5 is arranged between the slide 4 and the linkage mechanism for the leg rest 3. The difference from the third embodiment is that the first coupling rod 61 in the coupling arrangement 6 is a long coupling rod.

[0049] Fig. Figure 10 schematically shows the structure of the coupling mechanism according to the invention in the seated position. Fig. Figure 11 schematically shows the structure of the coupling mechanism according to the invention in the lying position. The sitting position, the lying position, and the intermediate position of the coupling mechanism of the present embodiment are identical to those in the third embodiment and are not described again. Example 5

[0050] In this exemplary embodiment, a piece of seating furniture is specified, in particular a seat or a sofa, which incorporates the coupling mechanism according to one of the exemplary embodiments described above. The basic principles, main features, and advantages of the invention have been presented and described above. It should be clear to those skilled in the art that the present invention is not limited to the exemplary embodiments described above. The exemplary embodiments and descriptions above merely illustrate the principles of the invention. Various changes, modifications, substitutions, and variations are also possible that fall within the scope of the claimed invention without departing from the spirit and scope of the invention. Reference symbol list 1 seat frame 2. Backrest frame assembly 21 First linkage for the backrest 22 second linkage for the backrest 23 third linkage for the backrest 3. Leg rest frame mechanism 31 First linkage for the leg rest 32 second linkage for the leg rest 33 Third linkage for the leg rest 34 fourth linkage for the leg rest 35 carriers 36 Connecting rod 4 sleds 5 Drive 51 Festival End 52 Drive end 53 Drive rod 6 Coupling arrangement 61 first coupling rod 62 second coupling rod 63 third coupling rod 7 Backrest bracket 8 Leg rest

Claims

[1] Coupling mechanism comprising a seat frame (1), a leg rest (8) and a backrest support (7), the coupling mechanism further comprising a carriage (4) slidably connected to the seat frame (1); a linkage arrangement for the backrest (2) connected to the backrest bracket (7), the seat frame (1) and the carriage (4) so ​​that the backrest bracket (7) is coupled to the carriage (4) to move relative to the seat frame (1); a linkage mechanism for the leg rest (3) connected to the carriage (4) and the leg rest (8) to allow the leg rest (8) to move toward or away from the carriage (4); a coupling arrangement (6) rotatably connected to the carriage (4), one end of the coupling arrangement (6) being pivotally connected to the seat frame (1) and the other end of the coupling arrangement (6) being pivotally connected to the linkage mechanism for the leg rest (3); a drive arrangement connected to the carriage (4) for driving the leg rest (8) and the backrest support (7) so that the leg rest (8) and the backrest support (7) move relative to the seat frame (1); includes, wherein during operation of the drive arrangement the carriage (4) moves relative to the seat frame (1) and the leg rest (8) and the backrest holder (7) move and rotate relative to the seat frame (1), wherein the rod arrangement for the backrest (2) comprises a first rod for the backrest (21), a second rod for the backrest (22) and a third rod for the backrest (23), wherein one end of the first rod for the backrest (21) is pivotally connected to the backrest holder (7) and the other end of the first rod for the backrest (21) is pivotally connected to the seat frame (1), wherein one end of the second rod for the backrest (22) is also pivotally connected to the backrest holder (7) and the other end of the second rod for the backrest (22) is pivotally connected to the seat frame (1), wherein one end of the third rod for the backrest (23) is pivotally connected to the second rod for the backrest (22) and the other end of the third rod for the backrest (23) is pivotally connected to the slide (4) are connected in an articulated manner, the first rod for the backrest (21), the backrest support (7),the second linkage for the backrest (22) and the seat frame (1) are articulated together to form a planar quadrilateral linkage. [2] Coupling mechanism according to claim 1, characterized by that the drive arrangement is arranged between the carriage (4) and the seat frame (1), wherein the drive arrangement is designed to drive the carriage (4) so ​​that the carriage (4) can move relative to the seat frame (1), wherein the carriage (4) moves the leg rest (8) and the backrest holder (7) via the linkage mechanism for the leg rest (3), the coupling arrangement (6) and the linkage arrangement for the backrest (2) so that the leg rest (8) and the backrest holder (7) move and rotate relative to the seat frame (1). [3] Coupling mechanism according to claim 1, characterized byin that the drive arrangement is arranged between the carriage (4) and the linkage mechanism for the leg rest (3), wherein the drive arrangement is designed to drive the linkage mechanism for the leg rest (3) so that the linkage mechanism for the leg rest (3) rotates relative to the carriage (4), wherein the linkage mechanism for the leg rest (3) entrains the carriage (4) as well as the leg rest (8) and the backrest holder (7) via the coupling arrangement (6) and the linkage arrangement for the backrest (2) so that the carriage (4) moves relative to the seat frame (1) and the leg rest (8) and the backrest holder (7) move and rotate relative to the seat frame (1). [4] Coupling mechanism according to one of claims 1 to 3, characterized byin that the coupling arrangement (6) comprises a first coupling rod (61), a second coupling rod (62) and a third coupling rod (63), wherein the second coupling rod (62) is pivotally connected to the carriage (4) and one end of the second coupling rod (62) is pivotally connected to the first coupling rod (61) and the other end of the second coupling rod (62) is pivotally connected to the third coupling rod (63), wherein an end of the first coupling rod (61) remote from the second coupling rod (62) is pivotally connected to the seat frame (1), and wherein an end of the third coupling rod (63) remote from the second coupling rod (62) is pivotally connected to the linkage mechanism for the leg rest (3). [5] Coupling mechanism according to one of claims 1 to 3, characterized byin that the linkage mechanism for the leg rest (3) comprises a linkage arrangement for the leg rest (31, 32, 33, 34), a support (35) and a connecting rod (36), wherein two ends of the linkage arrangement for the leg rest (31, 32, 33, 34) are each pivotally connected to the carriage (4) and the support (35), wherein the leg rest (8) is pivotally connected to the linkage arrangement for the leg rest (31, 32, 33, 34), and wherein one end of the connecting rod (36) is pivotally connected to the support (35) and the other end of the connecting rod (36) is pivotally connected to the leg rest (8). [6] Coupling mechanism according to claim 5, characterized bythat the rod arrangement for the leg rest (31, 32, 33, 34) comprises a first rod for the leg rest (31), a second rod for the leg rest (32), a third rod for the leg rest (33) and a fourth rod for the leg rest (34), wherein a first end of the first rod for the leg rest (31) is pivotally connected to the carriage (4), while a second end of the first rod for the leg rest (31) is pivotally connected to the second rod for the leg rest (32), wherein an end of the second rod for the leg rest (32) remote from the first rod for the leg rest (31) is pivotally connected to an end of the leg rest (8) at a first pivot point, wherein a first end of the third rod for the leg rest (33) is pivotally connected to the carriage (4) while a second end of the third leg rest rod (33) is pivotally connected to the fourth leg rest rod (34),wherein an end of the fourth leg rest rod (34) remote from the third leg rest rod (33) is pivotally connected to the support (35), and the fourth leg rest rod (34) is pivotally connected at its center to a center of the first leg rest rod (31). [7] Coupling mechanism according to claim 6, characterized byin that the support (35) is also pivotally connected to the second linkage for the leg rest (32) at a second pivot point, the second pivot point being located near the first pivot point between the leg rest (8) and the second linkage for the leg rest (32), a third pivot point between the connecting rod (36) and the leg rest (8) being located near the first pivot point between the leg rest (8) and the second linkage for the leg rest (32), and the support (35), the connecting rod (36), the leg rest (8) and the second linkage for the leg rest (32) being pivotally connected to one another to form a planar four-bar linkage. [8] Coupling mechanism according to claim 3, characterized byin that the drive arrangement comprises a drive (5) and a drive rod (53), wherein the drive (5) comprises a fixed end (51) and a drive end (52), wherein one of the fixed end (51) and the drive end (52) is connected to the carriage (4), while another of the fixed end (51) and the drive end (52) is eccentrically hinged to the drive rod (53), and wherein the drive rod (53) is fixedly connected to the linkage mechanism for the leg rest (3). [9] Seating furniture, characterized by that the seating furniture comprises a coupling mechanism according to one of claims 1 to 8.

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