CN219720215U - Seat and linkage device thereof - Google Patents

Abstract

The utility model discloses a seat and a linkage device thereof, which are suitable for the seat with a swinging function, wherein the linkage device comprises a seat frame and further comprises: the swinging assembly is rotationally connected with the seat frame; the linkage mechanism comprises a connecting rod assembly and an extension assembly connected with the connecting rod assembly, and the connecting rod assembly is connected with the swinging assembly; the backrest component is connected with the connecting rod component; the driving mechanism is connected with the swinging assembly and the stretching assembly and is used for driving the stretching assembly to move between a sitting posture and a lying posture; wherein, when the driving mechanism drives the extension assembly to move from the sitting posture to the lying posture to a set stroke, the connecting rod assembly limits the swinging assembly to rotate relative to the seat frame. The seat and the linkage device thereof have simple structures, have the function of swinging in sitting postures, and can also keep the stability of lying postures.

Description

Seat and linkage device thereof

Technical Field

The utility model relates to the technical field of household articles, in particular to a seat and a linkage device thereof.

Background

With the development of society, people are increasingly pursuing quality of life. For the choice of furniture, consumers have not limited to a single function, and more so, it is desired to maximize the utilization of furniture, and there is an increasing demand for functionality and comfort of sofas and seats.

At present, a sofa with adjustable position and posture and a sofa with swinging function are on the market, wherein the generally adjusted postures are a normal sitting posture, a leisure posture in an extended position and a lying posture in a lying position. If the sofa with the position and the posture adjusted is added with the swinging function, when in actual use, the whole gravity center of the sofa can move forward when the sofa is in a lying posture, so that the whole gravity center of the sofa is unstable when swinging back and forth in the state, and potential safety hazards exist in the lying and resting state.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the seat and the linkage device thereof, which have simple structures, have the function of swinging of sitting postures, can also keep the stability of lying postures, improve the comfort of users and ensure the safety.

In a first aspect, the present utility model provides a linkage adapted for use with a seating apparatus having a rocking function, the linkage comprising a mount, further comprising:

the swinging assembly is rotationally connected with the seat frame;

the linkage mechanism comprises a connecting rod assembly and an extension assembly connected with the connecting rod assembly, and the connecting rod assembly is connected with the swinging assembly;

the backrest component is connected with the connecting rod component;

the driving mechanism is connected with the swinging assembly and the stretching assembly and is used for driving the stretching assembly to move between a sitting posture and a lying posture;

wherein, when the driving mechanism drives the extension assembly to move from the sitting posture to the lying posture to a set stroke, the connecting rod assembly limits the swinging assembly to rotate relative to the seat frame.

Through adopting above-mentioned technical scheme, aggregate unit only has two kinds of use postures of position of sitting and lying, compares with traditional thing to sit on, and the structure is simpler, and spare part that adopts is fewer, and manufacturing cost is lower, and production efficiency is higher. The linkage device can realize the conversion function of sitting posture and lying posture, and the swinging component can also realize the swinging function of the rocking chair, so that the functionality is better. When the extension assembly is in a lying state, the connecting rod assembly automatically limits the rotation of the swinging assembly according to the stroke position, so that the lying state is more stable and safer.

With reference to the first aspect, further aspects, the extension assembly moves from the sitting position to the lying position for a total stroke, and the set stroke is between one half and three quarters of the total stroke.

By adopting the technical scheme, when the extension assembly moves to the position of one half to three quarters of travel, the swinging assembly can not swing, so that the body is more stable when the feet of the passengers are lifted off the ground and the bodies are reclined in a half lying state, and the safety feeling of the passengers is higher.

In combination with the first aspect, further aspects, a first limiting mechanism is disposed between the link assembly and the swing assembly, and when the extension assembly moves to the set stroke, the link assembly and the swing assembly are connected by the limiting mechanism so as to limit the swing assembly to rotate relative to the seat frame.

Through adopting above-mentioned technical scheme, when the extension subassembly moved to the settlement stroke, locking through stop gear between link assembly and the rocking assembly to the restriction rocking assembly sways. The limiting mechanism which is arranged independently can ensure the reliability of the function, and meanwhile, the mounting position can be flexibly adjusted according to different specifications of products, so that the design and the assembly are more flexible, and the after-sales maintenance is also convenient.

In combination with the first aspect, further aspects, the limiting mechanism includes a connecting rod limiting member connected with the connecting rod assembly and a swinging limiting member connected with the swinging assembly, and when the stretching assembly moves to the set stroke, the connecting rod limiting member is connected with the swinging limiting member to limit the swinging assembly to rotate relative to the seat frame.

Through adopting above-mentioned technical scheme, rocking subassembly is provided with sways the locating part, and link assembly is provided with the link locating part, realizes the separation and reunion of the different strokes of extension subassembly through simple structure, simple structure is reliable.

With reference to the first aspect, further aspects, a second limiting mechanism is disposed between the backrest assembly and the link assembly, and the second limiting mechanism limits a rotation range of the backrest assembly when the extension assembly moves between the sitting posture and the lying posture.

Through adopting above-mentioned technical scheme, when extending the subassembly and moving between position of sitting and lying, the back subassembly follows and rotates together, and the rotation scope of back subassembly can be limited to second stop gear, makes the back subassembly more reliable to the support of human back, also can reduce the atress of link assembly, promotes whole device's life.

In combination with the first aspect, further solutions, the link assembly includes a link frame, a slide bar, a limit bar, a first link, a second link, a third link, and a pull bar, one end of the limit bar is pivoted with the swing assembly, the other end is slidingly connected with the slide bar, and the slide bar is pivoted with the swing assembly; the first connecting rod is pivotally connected between the swinging assembly and the connecting rod bracket, and the pull rod is pivotally connected between the backrest assembly and the stretching assembly; one end of the second connecting rod is pivoted with the swinging assembly, the other end of the second connecting rod is pivoted with the third connecting rod, two pivoting shafts of the second connecting rod are pivoted with the connecting rod frame, and one end of the third connecting rod, which is far away from the second connecting rod, is pivoted with the pull rod.

Through adopting above-mentioned technical scheme, link assembly is connected with swaing the subassembly, and through the innovative design to link assembly, link assembly can realize the swing together with swaing the subassembly, can realize the motion between position of sitting and the position of lying again, and can realize the swaing experience of position of sitting before locking between link assembly and swaing the subassembly, can restrict the motion of swaing the subassembly under the position of lying again in order to realize stable lying rest.

In combination with the first aspect, further aspects, the backrest assembly includes a backrest frame and a backrest link pivoted to the backrest frame, the backrest frame is hinged to the link frame, one end of the backrest link away from the backrest frame is hinged to the limit rod and slidably connected to the slide rod, and the pull rod is pivotally connected to the backrest assembly to a pivot shaft pivoted to the backrest frame and the backrest link.

By adopting the technical scheme, the backrest component can cooperatively move with the connecting rod component under the drive of the connecting rod bracket, the pull rod and the limiting rod and the limitation of the sliding rod, so that the angle change of the backrest bracket under different postures is realized.

In combination with the first aspect, the stretching assembly further comprises a first stretching rod, a second stretching rod pivoted with the first stretching rod, a third stretching rod, a fourth stretching rod pivoted with the third stretching rod and a foot rest, wherein one end of the first stretching rod, which is far away from the second stretching rod, is hinged with the connecting rod rest, one end of the second stretching rod, which is far away from the first stretching rod, is hinged with the foot rest, one end of the third stretching rod, which is far away from the fourth stretching rod, is hinged with the connecting rod rest, one end of the fourth stretching rod, which is far away from the third stretching rod, is hinged with the foot rest, the second stretching rod is pivoted with the third stretching rod, the driving mechanism is connected with the third stretching rod, and the pull rod is hinged with the first stretching rod.

Through adopting above-mentioned technical scheme, actuating mechanism drive third extension pole rotary motion, third extension pole drive fourth extension pole and second extension pole rotate, and fourth extension pole and second extension pole drive foot rest rotate, and the second extension pole drives first extension pole and rotates, and first extension pole drives the pull rod motion, and the pull rod drives back subassembly and third connecting rod rotation, and the third connecting rod drives the second connecting rod rotation and is close to or keep away from swinging the subassembly motion with driving the connecting rod rest. Through the structural design, synchronous motion of the extension assembly, the backrest assembly and the connecting rod rest can be realized, so that conversion of different postures is realized, and zero gravity experience is realized.

In combination with the first aspect, the swinging assembly comprises a swinging rod, a first swinging rod and a second swinging rod, the first swinging rod and the second swinging rod are rotatably connected between the swinging rod and the seat frame, the limiting rod is pivoted with the swinging rod, the limiting rod is provided with a limiting groove/limiting column, the first swinging rod is provided with a limiting column/limiting groove, and when the stretching assembly moves to the set stroke, the limiting groove is clamped with the limiting column.

By adopting the technical scheme, the swinging rod can swing relative to the seat frame through the first swinging rod and the second swinging rod. When the extension assembly moves to a set stroke, the limiting groove is clamped with the limiting column to limit the relative movement between the limiting rod and the first rocker, so that the rotation of the rocking rod relative to the seat frame is limited, and the structure is simple and reliable.

In a second aspect, the utility model provides a seating furniture comprising the linkage of the first aspect.

With reference to the second aspect, in a further scheme, the connecting rod rest is connected with a seat cushion, the backrest rest is connected with a backrest, and in a lying state, an included angle between the plane of the seat cushion and the horizontal plane is 17 degrees to 50 degrees, and an included angle between the backrest and the seat cushion is 120 degrees to 150 degrees.

By adopting the technical scheme, the seat can realize two use states of swinging function, sitting posture and lying posture, and in the process of converting the two postures, the backrest frame, the extension assembly and the connecting rod frame realize linkage. In the lying state, the included angle between the plane of the seat cushion connected with the connecting rod rest and the horizontal plane is 17-50 degrees, preferably 18.5 degrees, the included angle between the backrest connected with the backrest rest and the seat cushion is 120-150 degrees, preferably 140 degrees, and the seat cushion is the most comfortable state, so that the zero gravity experience of an occupant is realized.

In summary, the utility model has at least one of the following beneficial technical effects:

1. the linkage device has the advantages of simpler structure, fewer adopted parts, lower production cost and higher production efficiency. The design and the assembly are more flexible, and the after-sales maintenance is also convenient.

2. The linkage device not only can realize the conversion function of sitting posture and lying posture, but also can realize the swinging function of the rocking chair by the swinging component, and has better functionality. When the extension assembly is in the lying state, the connecting rod assembly automatically limits the rotation of the swinging assembly according to the stroke position, so that the lying state is more stable and safer

3. The seat disclosed by the utility model not only can realize a swinging function, but also has two use states of sitting posture and lying posture, is more stable in the lying posture, and realizes zero gravity experience of an occupant.

Drawings

FIG. 1 is a schematic perspective view of a linkage of the present utility model in a sitting position;

FIG. 2 is a front view of the linkage of the present utility model in a seated position;

FIG. 3 is a rear view of the linkage of the present utility model in a seated position;

FIG. 4 is a schematic perspective view of the linkage of the present utility model during opening;

FIG. 5 is a front view of the linkage of the present utility model during opening;

FIG. 6 is a rear view of the linkage of the present utility model during opening;

FIG. 7 is an enlarged schematic view of FIG. 6 at A;

FIG. 8 is a schematic perspective view of the linkage of the present utility model in a recumbent position;

FIG. 9 is a front view of the linkage of the present utility model in a recumbent position;

FIG. 10 is a rear view of the linkage of the present utility model in a recumbent position;

fig. 11 is an enlarged schematic view at B in fig. 10.

Reference numerals:

1. a mounting; 11. a turntable; 12. a base; 13. a chassis; 2. a swing assembly; 21. swinging the rod; 22. a first rocker; 221. a rocker limit column; 23. a second rocker; 24. a support rod; 3. a backrest assembly; 31. a backrest frame; 311. a back frame limit part; 32. a backrest link; 4. a connecting rod assembly; 41. a connecting rod bracket; 411. a rod frame limit column; 412. a back frame limit column; 42. a limit rod; 421. a limit groove; 43. a pull rod; 44. a third link; 45. a second link; 46. a slide bar; 47. a first link; 5. an extension assembly; 51. a first extension bar; 52. a second extension rod; 53. a third extension bar; 54. a fourth extension bar; 55. a foot rest; 6. a driving mechanism; 61. a driving end; 62. a pushing end; 63. a push rod.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the present utility model will be described in further detail with reference to the accompanying drawings. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Some embodiments of the present utility model are described in detail below with reference to the accompanying drawings. Features of the embodiments described below may be combined with each other without conflict.

Example 1

Referring to fig. 1-3, a sitting posture structure of an embodiment of the linkage of the present utility model is shown. The linkage device in the embodiment comprises a seat frame 1, a linkage mechanism connected with the seat frame 1 and a swinging assembly 2 rotatably connected with the seat frame 1. The linkage mechanism comprises a connecting rod assembly 4 and an extension assembly 5 which are connected with the swinging assembly 2, the connecting rod assembly 4 is connected with a backrest assembly 3, a driving mechanism 6 is connected between the swinging assembly 2 and the extension assembly 5, and the driving mechanism 6 drives the extension assembly 5 to move between a sitting posture and a lying posture.

The seat frame 1 comprises a base 12 for contacting with the ground, the base 12 is connected with a turntable 11, the turntable 11 is connected with a bottom frame 13, and the bottom frame 13 can realize 360-degree rotation relative to the base 12 through the turntable 11. The swinging assembly 2 comprises a swinging rod 21, the swinging rod 21 is connected with the underframe 13 through a first swinging rod 22 and a second swinging rod 23 to form a four-rod mechanism, so that the swinging rod 21 can swing relative to the underframe 13, and the swinging rod 21 is fixedly connected with a supporting rod 24. The driving mechanism 6 includes a driving end 61 and a pushing end 62, the driving end 61 is hinged with the strut 24, the pushing end 62 is hinged with a push rod 63, the driving mechanism 6 in this embodiment is an electric push rod 63, the driving end 61 is a motor, the pushing end 62 is a push rod 63, and in practical application, a pneumatic or hydraulic driving mechanism can be adopted as required.

Referring to fig. 1-3, the link assembly 4 includes a link frame 41, a slide bar 46, a limit bar 42, a first link 47, a second link 45, a third link 44 and a pull bar 43, wherein one end of the limit bar 42 is pivoted to the swing assembly 2, the other end is slidably connected to the slide bar 46, and the slide bar 46 is pivoted to the swing assembly 2. The first link 47 is pivotally connected between the swing assembly 2 and the link bracket 41, and the link 43 is pivotally connected between the backrest assembly 3 and the extension assembly 5. One end of the second connecting rod 45 is pivoted with the swinging assembly 2, the other end of the second connecting rod 45 is pivoted with the third connecting rod 44, two pivoting shafts of the second connecting rod 45 are pivoted with the connecting rod rest 41, and one end of the third connecting rod 44 away from the second connecting rod 45 is pivoted with the pull rod 43.

The backrest assembly 3 comprises a backrest frame 31 and a backrest connecting rod 32 pivoted with the backrest frame 31, the backrest frame 31 is hinged with a connecting rod frame 41, one end of the backrest connecting rod 32 away from the backrest frame 31 is hinged with a limit rod 42 and is in sliding connection with a slide rod 46, and the pull rod 43 and the backrest assembly 3 are pivoted with a pivot shaft pivoted with the backrest frame 31 and the backrest connecting rod 32.

The stretching assembly 5 comprises a first stretching rod 51, a second stretching rod 52 pivoted with the first stretching rod 51, a third stretching rod 53, a fourth stretching rod 54 pivoted with the third stretching rod 53 and a foot rest 55; one end of the first stretching rod 51 far away from the second stretching rod 52 is hinged with the connecting rod bracket 41, one end of the second stretching rod 52 far away from the first stretching rod 51 is hinged with the foot rest 55, one end of the third stretching rod 53 far away from the fourth stretching rod 54 is hinged with the connecting rod bracket 41, one end of the fourth stretching rod 54 far away from the third stretching rod 53 is hinged with the foot rest 55, two pivot shafts of the second stretching rod 52 and two pivot shafts of the third stretching rod 53 are in pivot connection, a push rod 63 is fixedly connected with the third stretching rod 53, the driving mechanism 6 is connected with the third stretching rod 53 through the push rod 63, the push rod 63 is a hollow tube with a rectangular cross section, and the pull rod 43 is hinged with the first stretching rod 51.

Referring to fig. 1, a rod rest limiting post 411 is fixed on a connecting rod rest 41, in a sitting posture state, the rod rest limiting post 411 abuts against a second connecting rod 45 to limit the second connecting rod 45 to continue rotating towards the rod rest limiting post 411, so that the auxiliary driving mechanism 6 realizes stable and reasonable stress in the sitting posture state, and is also helpful to realize reasonable movement track between the connecting rod rest 41 and a swinging rod 21 when the sitting posture state is converted into a lying posture state, and the connecting rod rest 41 can move close to or far away from the swinging rod 21 relatively to achieve an optimal posture of zero gravity experience.

Referring to fig. 2, a limiting mechanism is disposed between the backrest module 3 and the link module 4, and limits the rotation range of the backrest module 3 when the extension module 5 moves between the sitting and lying postures. In this embodiment, this is achieved by: the connecting rod rest 41 is fixed with a back rest limiting column 412, the back rest 31 is provided with a back rest limiting part 311, the back rest limiting part 311 is a groove with a set curve, the groove is abutted with the back rest limiting column 412 and slides in the process of converting the sitting posture into the lying posture, the groove is abutted with the back rest limiting column 412 in the sitting posture state to limit the back rest 31 to rotate forwards, and the groove is abutted with the back rest limiting column 412 in the lying posture state to limit the back rest 31 to rotate backwards.

In the sitting position, the extension assembly 5 is retracted toward the seat frame 1 by the building, the driving mechanism 6, the rod frame limiting column 411 and the back frame limiting column 412 limit the movement of the linkage mechanism, and the foot rest 55 is approximately vertically downward, at this time, the legs of the occupant can naturally droop.

Referring to fig. 4-7, an intermediate state structure of an embodiment of the linkage of the present utility model is shown.

Referring to fig. 4-6, the driving mechanism 6 pushes the push rod 63 to move away from the driving end 61, the push rod 63 drives the third extension rod 53 to rotate, the third extension rod 53 drives the fourth extension rod 54 and the second extension rod 52 to rotate, the second extension rod 52 drives the first extension rod 51 to rotate, the first extension rod 51 drives the pull rod 43 to move, the pull rod 43 drives the backrest assembly 3 and the third link 44 to rotate, and the third link 44 drives the second link 45 to rotate to drive the link frame 41 to move away from the swinging assembly 2. The foot rest 55 is rotated under the pushing of the second extension rod 52 and the fourth extension rod 54 to form an angle with the ground, and the angle is continuously reduced along with the rotation. The link frame 41 moves away from the swing assembly 2 and simultaneously moves in the direction of the foot rest 55, and the back rest 31 rotates backward, thereby realizing the linkage of the whole device and converting the sitting posture into the lying posture in the most comfortable way.

Referring to fig. 6, the slide bar 46 is provided with a slide groove, the pivot shafts of the limit bar 42 and the backrest link 32 are slidably disposed in the slide groove, and the limit bar 42 and the backrest link 32 rotate while sliding relative to the slide bar 46.

Referring to fig. 6 and 7, a limiting mechanism is disposed between the link assembly 4 and the swing assembly 2, and when the extension assembly 5 moves to a set stroke, the link assembly 4 and the swing assembly 2 are connected by the limiting mechanism to limit the swing assembly 2 to rotate relative to the seat frame 1. The manner adopted in this embodiment is as follows: the first rocker 22 is provided with a rocker limit post 221, and the limit rod 42 is provided with a limit groove 421. When the extension assembly 5 moves to a set position between one half and three quarters of the total stroke from the sitting posture to the lying posture, the rocker limiting post 221 slides into the limiting groove 421, the first rocker 22 and the limiting rod 42 are connected through the rocker limiting post 221 and the limiting groove 421, and the rocking rod 21 and the first rocker 22 cannot rotate relatively, so that the rocking assembly 2 is limited to rotate relative to the seat frame 1, and stability and safety of the lying posture state are ensured. In specific applications, a limit groove may be provided on the first rocker 22, and a limit post may be provided on the limit rod 42, or the same function may be implemented through other combined structures, such as a link mechanism, a gear mechanism, or a ratchet-pawl mechanism.

Referring to fig. 8-11, a recumbent state structure of an embodiment of the linkage of the present utility model is shown. The drive mechanism 6 continues to drive the extension assembly 5 in a direction away from the seat frame 1, the extension assembly 5 is fully extended, the support surface of the foot rest 55 is approximately parallel to the ground, and the back rest 31 is rotated back to a maximum angle. The backrest link 32, the first link 47 and the second link 45 are rotated to be approximately vertical, and in this state, the link frame 41 is farthest from the swing link 21, that is, the seat is lifted.

Referring to fig. 11, in this state, the rocker limiting post 221 slides completely into the limiting groove 421, and the swing assembly 2 cannot rotate relative to the seat frame 1.

When the lying posture is converted into the sitting posture, the driving mechanism 6 drives the push rod 63 to move towards the driving end 61, and the push rod 63 drives the stretching assembly 5 to move towards the driving end 61 to the sitting posture state.

Example two

The present embodiment provides a seat, in particular a seat or a sofa, including the linkage device in the first embodiment, the connecting rod frame 41 of the linkage device is fixedly connected with the seat cushion of the seat, the backrest is fixedly connected with the backrest frame 31, the foot rest 55 is connected with a foot rest board, the base 12 is contacted with the ground, and the seat can rotate relative to the base 12 through the turntable 11.

The seat of the embodiment can realize the swinging function and two use states of sitting posture and lying posture, and the backrest, the seat cushion and the foot support plates are linked in the two posture conversion processes. In the lying state, the included angle between the supporting plane of the seat cushion and the horizontal plane is 17-50 degrees, preferably 18.5 degrees, the included angle between the backrest and the seat cushion is 120-150 degrees, preferably 140 degrees, and the seat cushion is the most comfortable state, so that the zero gravity experience of an occupant is realized.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the embodiments and descriptions described herein are merely illustrative of the principles of the present utility model, and various changes, modifications, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model, which are to be defined by the appended claims.

Claims (10)

1. A linkage suitable for a seat with rocking function, the linkage comprising a seat frame (1), characterized in that it further comprises:

the swinging assembly (2) is rotationally connected with the seat frame (1);

the linkage mechanism comprises a connecting rod assembly (4) and an extension assembly (5) connected with the connecting rod assembly (4), and the connecting rod assembly (4) is connected with the swinging assembly (2);

a backrest assembly (3) connected to the link assembly (4);

a driving mechanism (6) connected with the swinging assembly (2) and the stretching assembly (5) and used for driving the stretching assembly (5) to move between sitting and lying postures;

wherein, when the driving mechanism (6) drives the extension assembly (5) to move from the sitting posture to the lying posture to a set stroke, the connecting rod assembly (4) limits the swinging assembly (2) to rotate relative to the seat frame (1).

2. Linkage according to claim 1, characterized in that the movement of the extension assembly (5) from the sitting to the lying position is a total stroke, the set stroke being between one half and three quarters of the total stroke.

3. Linkage according to claim 1, characterized in that a first limiting mechanism is provided between the link assembly (4) and the rocking assembly (2), the link assembly (4) and the rocking assembly (2) being connected by the limiting mechanism to limit the rotation of the rocking assembly (2) relative to the seat frame (1) when the extension assembly (5) is moved to the set stroke.

4. A linkage according to claim 3, wherein the limit mechanism comprises a link limit connected to the link assembly (4) and a sway limit connected to the sway assembly (2), the link limit and sway limit being connected to limit rotation of the sway assembly (2) relative to the mount (1) when the extension assembly (5) is moved to the set stroke.

5. Linkage according to claim 1, characterized in that a second limiting mechanism is provided between the backrest assembly (3) and the link assembly (4), which limits the range of rotation of the backrest assembly (3) when the extension assembly (5) is moved between sitting and lying positions.

6. The linkage according to any one of claims 1-5, wherein the linkage assembly (4) comprises a linkage frame (41), a slide bar (46), a limit bar (42), a first link (47), a second link (45), a third link (44) and a pull bar (43), one end of the limit bar (42) being pivoted to the swing assembly (2) and the other end being slidingly connected to the slide bar (46), the slide bar (46) being pivoted to the swing assembly (2); the first connecting rod (47) is pivotally connected between the swinging assembly (2) and the connecting rod bracket (41), and the pull rod (43) is pivotally connected between the backrest assembly (3) and the extension assembly (5); one end of the second connecting rod (45) is pivoted with the swinging assembly (2), the other end of the second connecting rod is pivoted with the third connecting rod (44), two pivoting shafts of the second connecting rod (45) are pivoted with the connecting rod bracket (41), and one end of the third connecting rod (44) away from the second connecting rod (45) is pivoted with the pull rod (43).

7. Linkage according to claim 6, characterized in that the backrest assembly (3) comprises a backrest frame (31) and a backrest link (32) pivoted to the backrest frame (31), the backrest frame (31) being hinged to the link frame (41), the end of the backrest link (32) remote from the backrest frame (31) being hinged to the limit lever (42) and being in sliding connection with the slide bar (46), the pull lever (43) being pivotally connected to the backrest assembly (3) to a pivot axis of the backrest frame (31) pivoted to the backrest link (32).

8. The linkage according to claim 6, characterized in that the stretching assembly (5) comprises a first stretching rod (51), a second stretching rod (52) pivoted to the first stretching rod (51), a third stretching rod (53), a fourth stretching rod (54) pivoted to the third stretching rod (53) and a foot rest (55); the first stretching rod (51) is far away from one end of the second stretching rod (52) and hinged to the connecting rod bracket (41), one end of the second stretching rod (52) far away from the first stretching rod (51) is hinged to the foot support (55), one end of the third stretching rod (53) far away from the fourth stretching rod (54) is hinged to the connecting rod bracket (41), one end of the fourth stretching rod (54) far away from the third stretching rod (53) is hinged to the foot support (55), the second stretching rod (52) and the third stretching rod (53) are in pivot connection, the driving mechanism (6) is connected with the third stretching rod (53), and the pull rod (43) is hinged to the first stretching rod (51).

9. A seating furniture comprising a linkage as claimed in any one of claims 1 to 8.

10. A seating arrangement according to claim 9, wherein the link frame (41) is connected to a seat cushion and the back frame (31) is connected to a back rest, the seat cushion plane being at an angle of 17 ° to 50 ° to the horizontal and the back rest being at an angle of 120 ° to 150 ° to the seat cushion in the reclined position.