Backrest mechanism, seat bracket and sofa

Abstract

The invention provides a backrest mechanism, a seat bracket and a sofa. The backrest mechanism comprises a backrest mounting plate and a backrest bracket, the driving assembly comprises a front backrest connecting rod, a rear backrest connecting rod and a driving part, the front end of the front backrest connecting rod is hinged to the front end of the backrest mounting plate, the upper end of the rear backrest connecting rod is hinged to the rear end of the backrest mounting plate, and the front backrest connecting rod and the rear backrest connecting rod are hinged to the seat frame mounting part through the driving part; a limiting end capable of receiving external acting force is arranged on the driving part, so that the driving part can rotate relative to the seat frame mounting part; wherein the backrest mounting plate is provided with a folding position which is folded relative to the seat frame mounting piece and an unfolding position which is inclined backwards relative to the seat frame mounting piece, and the driving plate can drive the backrest mounting plate to move between the folding position and the unfolding position through the front backrest connecting rod and the rear backrest connecting rod. According to the technical scheme provided by the invention, the problem that a sofa in the related technology cannot realize a zero wall leaning function can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture, and in particular to a backrest mechanism, a seat bracket and a sofa. Background Art

[0002] A movable sofa is a common piece of furniture in life, which allows people to adjust their posture according to their needs. A movable sofa usually includes two or three of the following postures: lying posture, TV posture and sitting posture. Among them, a movable sofa has legs, a seat and a backrest. By arranging soft padding on the corresponding structure, a soft-padded seat, a soft-padded backrest and a soft-padded footrest of the sofa are formed. In the sitting position, the legs are not opened, the seat is close to a horizontal state, and the backrest is in a nearly upright state. In the TV posture, also called the TV posture, the legs are opened forward and the backrest remains basically unchanged. In the lying position, the backrest tilts back and the legs remain basically unchanged for people to rest.

[0003] However, the backrest mounting plate of the existing sofa is hinged on the seat frame mounting part, so that the position of the backrest soft bag is limited to the seat frame mounting part, and the zero wall-leaning function of the sofa cannot be realized. In addition, in the lying state, as the forward movement distance increases, the angle between the adjacent connecting rods of the backrest is too large, which may affect the bearing capacity, stability and movement smoothness of the backrest and even the entire sofa. Summary of the invention

[0004] The invention provides a backrest mechanism, a seat bracket and a sofa, so as to solve the problem that the sofa in the related art cannot realize the zero-wall leaning function.

[0005] According to one aspect of the present invention, a backrest mechanism is provided, which includes: a backrest mounting plate; a driving assembly, including a front backrest connecting rod, a rear backrest connecting rod and a driving member, wherein the front end of the front backrest connecting rod is hinged to the front end of the backrest mounting plate, the upper end of the rear backrest connecting rod is hinged to the rear end of the backrest mounting plate, the front backrest connecting rod and the rear backrest connecting rod are hinged to the seat frame mounting member through the driving member, and the driving member is provided with a limiting end capable of receiving an external force so that the driving member can rotate relative to the seat frame mounting member; wherein the backrest mounting plate has a folded position folded relative to the seat frame mounting member and an unfolded position reclined relative to the seat frame mounting member, and the driving member can drive the backrest mounting plate to move between the folded position and the unfolded position via the front backrest connecting rod and the rear backrest connecting rod.

[0006] Furthermore, the driving member includes a driving plate and a limit rod, the lower end of the rear backrest connecting rod is hinged to the driving plate, the driving plate is hinged to the seat frame mounting member, the limit end is arranged on the driving plate, the limit rod is hinged to the front backrest connecting rod, one of the front backrest connecting rod and the limit rod is hinged to the seat frame mounting member, and the other of the front backrest connecting rod and the limit rod is hinged to the driving plate.

[0007] Furthermore, the upper end of the limit rod is hinged to the middle part of the front backrest connecting rod, the lower end of the limit rod is hinged to the seat frame mounting component, and the rear end of the front backrest connecting rod is hinged to the driving plate.

[0008] Further, the front backrest connecting rod and the rear backrest connecting rod are cross-arranged, and the rear end of the front backrest connecting rod is located behind the lower end of the rear backrest connecting rod.

[0009] Further, when the backrest mounting plate is located at the folded position, the upper end of the rear backrest connecting rod is located behind its lower end, and when the backrest mounting plate is located at the unfolded position, the upper end of the rear backrest connecting rod is located in front of its lower end.

[0010] Furthermore, the front end of the front backrest connecting rod and the front end of the backrest mounting plate are hinged at a first hinge point O, the upper end of the rear backrest connecting rod and the rear end of the backrest mounting plate are hinged at a second hinge point E, the lower end of the rear backrest connecting rod and the driving plate are hinged at a third hinge point C, the line connecting the first hinge point O and the second hinge point E is the line L1, the line connecting the second hinge point E and the third hinge point C is the line L2, the angle between the line L1 and the line L2 is the angle α, and when the backrest mounting plate is in the expanded position, the angle α is between 40° and 135°.

[0011] Furthermore, a protrusion is arranged at the rear end of the backrest mounting plate, the second hinge point E is arranged at the protrusion, and the protrusion is arranged to be tilted upward.

[0012] Furthermore, the front end of the front backrest connecting rod and the front end of the backrest mounting plate are hinged at the first hinge point O, the rear end of the front backrest connecting rod and the drive plate are hinged at the fourth hinge point B, the limit end of the drive plate is the fifth hinge point D, the line connecting the first hinge point O and the fourth hinge point B is the line L3, the line connecting the fourth hinge point B and the fifth hinge point D is the line L4, and the angle between the line L3 and the line L4 is the angle β. When the backrest mounting plate is in the expanded position, the angle β is between 40° and 135°.

[0013] Furthermore, the lower end of the rear backrest connecting rod is hinged to the driving plate at the third hinge point C, the rear end of the front backrest connecting rod is hinged to the driving plate at the fourth hinge point B, the seat frame mounting piece is hinged to the driving plate at the sixth hinge point A, the line connecting the third hinge point C and the fourth hinge point B is the line L5, the line connecting the fourth hinge point B and the sixth hinge point A is the line L6, and the size of the line L5 is larger than the size of the line L6.

[0014] Furthermore, the ratio of the size of the connection line L5 to the size of the connection line L6 is between 1.71 and 2.55.

[0015] Furthermore, the lower end of the rear backrest connecting rod is hinged to the driving plate at the third hinge point C, the rear end of the front backrest connecting rod is hinged to the driving plate at the fourth hinge point B, the seat frame mounting part is hinged to the driving plate at the sixth hinge point A, the connecting line of the fourth hinge point B and the sixth hinge point A is the connecting line L6, the connecting line of the third hinge point C and the sixth hinge point A is the connecting line L7, and the size of the connecting line L6 is smaller than the size of the connecting line L7.

[0016] Furthermore, the ratio of the size of the connection line L7 to the size of the connection line L6 is between 1.46 and 2.18.

[0017] Further, when the backrest mounting plate is switched from the folded position to the unfolded position, the front end of the backrest mounting plate moves forward and downward.

[0018] Furthermore, when the backrest mounting plate is switched from the folded position to the unfolded position, the rotation angle of the backrest mounting plate relative to the seat frame mounting member is between 24° and 40°.

[0019] Furthermore, when the backrest mounting plate is in the folded position, the hinge point of the seat frame mounting member and the drive plate is located in front of the rear end of the front backrest connecting rod, and when the backrest mounting plate is in the expanded position, the hinge point of the seat frame mounting member and the drive plate is located behind the rear end of the front backrest connecting rod.

[0020] According to another aspect of the present invention, a seat bracket is provided, which includes: a mounting base fixed relative to the ground; a seat frame mounting member movably connected to the mounting base and capable of moving relative to the mounting base; a footrest mechanism hinged to the front end of the seat frame mounting member; and a backrest mechanism, wherein a drive plate of the backrest mechanism is respectively hinged to the mounting base and the seat frame mounting member, and the backrest mechanism is the backrest mechanism provided above.

[0021] Furthermore, the mounting base is an armrest mounting plate, and the seat bracket also includes a suspension component and a movable component. The suspension component is swingably arranged on the seat frame mounting piece, and the front and rear ends of the suspension component are movably connected to the armrest mounting plate through the movable component respectively.

[0022] Furthermore, a distance K1 between the lower surface of the handrail mounting plate and the ground is between 11 cm and 17 cm.

[0023] Furthermore, the suspension assembly includes a front swing arm, a transition swing arm and a rear swing arm. The upper end of the front swing arm and the upper end of the rear swing arm are respectively hinged to the seat frame mounting member, the lower end of the front swing arm and the lower end of the rear swing arm are respectively hinged to the transition swing arm, and the front end and the rear end of the transition swing arm are respectively movably connected to the armrest mounting plate through movable components.

[0024] Furthermore, the movable component includes a slide rail and a pulley slidably arranged in the slide rail, one of the pulley and the slide rail is arranged on the suspension component, and the other of the pulley and the slide rail is arranged on the armrest mounting plate.

[0025] Furthermore, the movable component includes a first link, a second link and a third link, the lower end of the first link and the lower end of the second link are respectively hinged to the armrest mounting plate, the upper end of the first link is hinged to the middle part of the third link, the upper end of the second link is hinged to the rear end of the third link, and the front end of the third link is hinged to the suspension component.

[0026] Furthermore, the seat bracket also includes a front drive rod and a rear drive rod, the front end of the front drive rod is hinged to the footrest mechanism, the rear end of the front drive rod is hinged to the suspension assembly, the upper end of the rear drive rod is hinged to the limiting end of the drive plate, and the lower end of the rear drive rod is hinged to the armrest mounting plate; the footrest mechanism includes a footrest drive plate, an inner bench plate, an outer bench plate, a rear bench plate, a first front bench connecting rod, a second front bench connecting rod, a front bench plate, a front footrest and a rear footrest, the rear end of the footrest drive plate is hinged to the front end of the front drive rod, the middle part of the footrest drive plate is hinged to the seat frame mounting part, the front end of the footrest drive plate is hinged to the rear end of the outer bench plate, the middle part of the outer bench plate is hinged to the middle part of the inner bench plate, the front end of the outer bench plate is hinged to the rear end of the first front bench connecting rod, the middle part of the first front bench connecting rod is hinged to the middle part of the rear bench plate, the front end of the first front bench connecting rod It is hinged to the rear end of the second front bench connecting rod, the middle part of the second front bench connecting rod is hinged to the middle part of the rear footstool, the front end of the second front bench connecting rod is hinged to the rear end of the front footstool, the rear end of the front bench board is hinged to the front end of the rear footstool, the front end of the front bench board is hinged to the front end of the front footstool, the front end of the rear bench board is hinged to the rear end of the rear footstool, the rear end of the rear bench board is hinged to the front end of the inner bench board, and the rear end of the inner bench board is hinged to the seat frame mounting part, wherein a limit button is arranged on the outer bench board, and after the footstool mechanism is unfolded, the limit button is fitted with the inner bench board; the seat bracket also includes a linear drive, a front drive tube and a rear drive tube, the front drive tube and the rear drive tube are arranged at intervals in the front and rear directions, the front drive tube is connected to the footstool mechanism, the rear drive tube is connected to the rear end of the armrest mounting plate, and the linear drive is hinged between the front drive tube and the rear drive tube.

[0027] Further, when the backrest mounting plate of the backrest mechanism switches from the folded position to the unfolded position, the front end of the backrest mounting plate first moves downward and then moves upward.

[0028] Furthermore, when the backrest mounting plate of the backrest mechanism switches from the folded position to the unfolded position, the rotation angle of the backrest mounting plate relative to the seat frame mounting member is between 25° and 38°.

[0029] Further, when the backrest mounting plate of the backrest mechanism is located at the unfolded position, an angle γ between the mounting surface of the seat frame mounting member and the horizontal plane is between 13° and 30°.

[0030] Further, when the backrest mounting plate of the backrest mechanism is located at the unfolded position, an angle δ between the backrest mounting plate and the horizontal plane is between 20° and 30°.

[0031] Further, when the backrest mounting plate of the backrest mechanism is located at the unfolded position, a vertical distance K2 between the highest point of the footrest mechanism and the highest point of the backrest mounting plate is between 260 mm and 380 mm.

[0032] According to yet another aspect of the present invention, a sofa is provided. The sofa comprises the seat bracket provided above.

[0033] By applying the technical solution of the present invention, the backrest mechanism includes a backrest mounting plate and a driving assembly, and the driving assembly can be rotated relative to the seat frame mounting assembly by applying an external force to the limiting end of the driving assembly. Since the front backrest connecting rod and the rear backrest connecting rod are hinged to the seat frame mounting assembly through the driving assembly, the driving assembly can drive the front backrest connecting rod and the rear backrest connecting rod to move. The front end of the front backrest connecting rod drives the front end of the backrest mounting plate to move, and the upper end of the rear backrest connecting rod drives the rear end of the backrest mounting plate to move, thereby enabling the backrest mounting plate to move relative to the seat frame mounting assembly, making the relative position of the backrest mounting plate and the seat frame mounting assembly more flexible. When the backrest mounting plate is switched from the folded position to the expanded position, the backrest mounting plate can move forward a greater distance relative to the seat frame mounting assembly, thereby solving the interference problem between the backrest and the wall and realizing the zero wall-leaning function of the sofa. Furthermore, since the front backrest connecting rod and the rear backrest connecting rod are both hinged on the driving member, the linkage performance between the connecting rods is enhanced during the movement of the backrest mounting plate, thereby enhancing the bearing capacity, stability and movement smoothness of the sofa. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1 It shows a structural schematic diagram of a backrest mounting plate of a backrest mechanism provided in Embodiment 1 of the present invention being in a folded position;

[0036] Figure 2 Another structural schematic diagram showing a backrest mounting plate of a backrest mechanism provided in accordance with the first embodiment of the present invention being in a folded position;

[0037] Figure 3 It shows a schematic structural diagram of a backrest mounting plate of a backrest mechanism provided in Embodiment 1 of the present invention being in an unfolded position;

[0038] Figure 4Another structural schematic diagram showing a backrest mounting plate of a backrest mechanism provided in accordance with the first embodiment of the present invention being in an unfolded position;

[0039] Figure 5 Another structural schematic diagram showing a backrest mounting plate of a backrest mechanism provided in Embodiment 1 of the present invention being located in an unfolded position;

[0040] Figure 6 It shows a structural schematic diagram of a seat support in a lying state according to a second embodiment of the present invention;

[0041] Figure 7 Shows Figure 6 Enlarged view of G in the middle;

[0042] Figure 8 Another structural schematic diagram showing a seat support in a lying position according to the second embodiment of the present invention;

[0043] Fig. 9 Another structural schematic diagram showing a seat support in a lying position according to the second embodiment of the present invention is shown;

[0044] Fig.10 It shows a structural schematic diagram of a seat support in a TV posture state according to a second embodiment of the present invention;

[0045] Fig.11 It shows a structural schematic diagram of a seat support in a sitting position according to a second embodiment of the present invention;

[0046] Fig.12 A comparison diagram of three postures of a seat bracket provided according to the second embodiment of the present invention is shown;

[0047] Fig.13 It shows a structural schematic diagram of a seat support in a lying position according to a third embodiment of the present invention;

[0048] Fig.14 Another structural schematic diagram of a seat support in a lying position according to the third embodiment of the present invention is shown;

[0049] Fig.15 Another structural schematic diagram of a seat support in a lying state provided in accordance with the third embodiment of the present invention is shown.

[0050] The above drawings include the following reference numerals:

[0051] 10. Backrest mounting plate; 11. Protrusion;

[0052] 20. Drive assembly; 21. Front backrest connecting rod; 22. Rear backrest connecting rod; 23. Drive plate; 24. Limit rod;

[0053] 30. Handrail mounting plate;

[0054] 40. Seat frame mounting parts;

[0055] 50. footstool mechanism; 51. footstool drive plate; 52. inner stool plate; 53. outer stool plate; 531. limit button; 54. rear stool plate; 55. first front stool connecting rod; 56. second front stool connecting rod; 57. front stool plate; 58. front footstool; 59. rear footstool;

[0056] 60. Backrest mechanism;

[0057] 70. Suspension assembly; 71. Front swing bar; 72. Transition swing bar; 73. Rear swing bar;

[0058] 80. movable assembly; 81. slide rail; 83. first connecting rod; 84. second connecting rod; 85. third connecting rod;

[0059] 90, front drive pipe; 91, rear drive pipe; 92, front drive rod; 93, rear drive rod;

[0060] 100. Auxiliary swing assembly; 101. Front swing auxiliary rod; 102. Transition swing auxiliary rod; 103. Rear swing auxiliary rod; 104. First swing connecting rod; 105. Second swing connecting rod; 106. Third swing connecting rod; 107. Fixed connecting rod. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] like Figures 1 to 5As shown, a backrest mechanism is provided in the first embodiment of the present invention. The backrest mechanism 60 includes a backrest mounting plate 10 and a driving assembly 20. The driving assembly 20 includes a front backrest link 21, a rear backrest link 22 and a driving member. The front end of the front backrest link 21 is hinged to the front end of the backrest mounting plate 10, and the upper end of the rear backrest link 22 is hinged to the rear end of the backrest mounting plate 10. The front backrest link 21 and the rear backrest link 22 are hinged to the seat frame mounting member 40 through the driving member. The driving member is provided with a limiting end capable of receiving an external force so that the driving member can rotate relative to the seat frame mounting member 40; wherein the backrest mounting plate 10 has a folded position folded relative to the seat frame mounting member 40 and an unfolded position reclined relative to the seat frame mounting member 40, and the driving member can drive the backrest mounting plate 10 to move between the folded position and the unfolded position through the front backrest link 21 and the rear backrest link 22.

[0063] By applying the technical solution of the present invention, the backrest mechanism includes a backrest mounting plate 10 and a driving assembly 20. By applying an external force to the limiting end of the driving member, the driving member can rotate relative to the seat frame mounting member 40. Since the front backrest connecting rod 21 and the rear backrest connecting rod 22 are hinged to the seat frame mounting member 40 through the driving member, the driving member can drive the front backrest connecting rod 21 and the rear backrest connecting rod 22 to move. The front end of the front backrest connecting rod 21 drives the front end of the backrest mounting plate 10 to move, and the upper end of the rear backrest connecting rod 22 drives the rear end of the backrest mounting plate 10 to move, thereby enabling the backrest mounting plate 10 to move relative to the seat frame mounting member 40, making the relative position of the backrest mounting plate 10 and the seat frame mounting member 40 more flexible. When the backrest mounting plate 10 is switched from the folded position to the unfolded position, the backrest mounting plate 10 can move forward a greater distance relative to the seat frame mounting member 40, thereby solving the interference problem between the backrest and the wall and realizing the zero wall-leaning function of the sofa. Furthermore, since the front backrest connecting rod 21 and the rear backrest connecting rod 22 are both hinged on the driving member, the linkage performance between the connecting rods is enhanced during the movement of the backrest mounting plate 10, thereby enhancing the bearing capacity, stability and movement smoothness of the sofa.

[0064] Among them, the front backrest link 21 and the rear backrest link 22 are hinged to the seat frame mounting member 40 through a driving member, which means that the front backrest link 21 and the rear backrest link 22 are hinged to the driving member, and the driving member is hinged to the seat frame mounting member 40. When the limiting end of the driving member is subjected to an external force, the driving member rotates relative to the seat frame mounting member 40 and drives the front backrest link 21 and the rear backrest link 22 to move.

[0065] It should be noted that the front and rear in this embodiment correspond to Figure 6 As shown in the middle perspective, the footrest mechanism 50 is unfolded in the forward direction, and the backrest mechanism 60 is reclined in the backward direction.

[0066] in, Figure 1Only a partial structure of the seat frame mounting member 40 is shown.

[0067] like Figure 1 and Figure 3 As shown, the driving member includes a driving plate 23 and a limiting rod 24, the lower end of the rear backrest link 22 is hinged to the driving plate 23, the driving plate 23 is hinged to the seat frame mounting member 40, the limiting end is arranged on the driving plate 23, the limiting rod 24 is hinged to the front backrest link 21, one of the front backrest link 21 and the limiting rod 24 is hinged to the seat frame mounting member 40, and the other of the front backrest link 21 and the limiting rod 24 is hinged to the driving plate 23. With the above-mentioned limiting member, the driving plate 23 can play a driving role to drive the front backrest link 21 and the rear backrest link 22 to move, and the limiting rod 24 can play a limiting role to limit the movement trajectory of the front backrest link 21, and then limit the movement trajectory of the backrest mounting plate 10 through the front backrest link 21.

[0068] In other embodiments, the movement trajectory of the backrest mounting plate 10 may also be restricted by restricting the movement trajectory of the rear backrest connecting rod 22 .

[0069] In this embodiment, the limiting end of the driving plate 23 means that when the backrest mechanism 60 is applied to the seat frame, the driving plate 23 can be hingedly connected to the mounting base through parts to limit the movement trajectory of the driving plate 23 so that the driving plate 23 can rotate relative to the seat frame mounting member 40. Specifically, it can be set as a hinge hole.

[0070] like Figure 3 As shown, the upper end of the limit rod 24 is hinged to the middle of the front backrest connecting rod 21, the lower end of the limit rod 24 is hinged to the seat frame mounting member 40, and the rear end of the front backrest connecting rod 21 is hinged to the driving plate 23. The above arrangement makes the connection structure simple and the movement more reliable.

[0071] In this embodiment, the backrest mounting plate 10, the front backrest connecting rod 21, the rear backrest connecting rod 22 and the driving plate 23 together form a first four-bar linkage. Through the deformation of the first four-bar linkage, the backrest mounting plate 10 can be tilted back. The front backrest connecting rod 21, the driving plate 23, the seat frame mounting member 40 and the limiting rod 24 together form a second four-bar linkage. Through the deformation of the second four-bar linkage, the backrest mounting plate 10 can be moved forward.

[0072] like Figure 1 As shown, the front backrest connecting rod 21 and the rear backrest connecting rod 22 are arranged crosswise, and the rear end of the front backrest connecting rod 21 is located behind the lower end of the rear backrest connecting rod 22. With the above structure, the movement track of the backrest mounting plate 10 can be made more flexible.

[0073] In this embodiment, the front backrest connecting rod 21 and the rear backrest connecting rod 22 do not have a direct connection structure, but are only staggered in the spatial structure.

[0074] like Figure 1 and Figure 3 As shown, when the backrest mounting plate 10 is in the folded position, the upper end of the rear backrest connecting rod 22 is located behind its lower end, and when the backrest mounting plate 10 is in the unfolded position, the upper end of the rear backrest connecting rod 22 is located in front of its lower end. Through the above-mentioned change in the movement trajectory of the rear backrest connecting rod 22, it can not only adapt to the distance generated by the forward movement of the backrest mounting plate 10 driven by the second four-bar linkage, but also drive the backrest mounting plate 10 to recline at a suitable reclining angle.

[0075] like Figure 4 As shown, the front end of the front backrest connecting rod 21 is hinged to the front end of the backrest mounting plate 10 at the first hinge point O, the upper end of the rear backrest connecting rod 22 is hinged to the rear end of the backrest mounting plate 10 at the second hinge point E, the lower end of the rear backrest connecting rod 22 is hinged to the driving plate 23 at the third hinge point C, the line connecting the first hinge point O and the second hinge point E is the line L1, the line connecting the second hinge point E and the third hinge point C is the line L2, the angle between the lines L1 and L2 is the angle α, when the backrest mounting plate 10 is in the unfolded position, the angle α is between 40° and 135°. The above range of values ​​can make the angle more reasonable, not too large or too small, the force between adjacent connecting rods is better and more reasonable, which helps to improve the support performance and bearing capacity, and also helps to improve the running smoothness of the seat bracket.

[0076] Preferably, the angle α is between 68° and 128°.

[0077] like Figure 1 As shown, the rear end of the backrest mounting plate 10 is provided with a protrusion 11, and the second hinge point E is provided on the protrusion 11, and the protrusion 11 is set upward. With the above arrangement, the second hinge point E can be set upward by a certain distance, so that the angle α is not too large and is within a reasonable range.

[0078] The protrusion 11 is tilted upward, which means that there is a certain angle between the outer wall of the protrusion 11 and the outer wall of the backrest mounting plate 10, and the outer wall of the protrusion 11 extends upward.

[0079] like Figure 4As shown, the front end of the front backrest connecting rod 21 is hinged to the front end of the backrest mounting plate 10 at the first hinge point O, the rear end of the front backrest connecting rod 21 is hinged to the drive plate 23 at the fourth hinge point B, the limit end of the drive plate 23 is the fifth hinge point D, the line connecting the first hinge point O and the fourth hinge point B is the line L3, the line connecting the fourth hinge point B and the fifth hinge point D is the line L4, the angle between the line L3 and the line L4 is the angle β, and when the backrest mounting plate 10 is in the unfolded position, the angle β is between 40° and 135°. The above range of values ​​can make the angle more reasonable, not too large or too small, and the force between adjacent connecting rods is better and more reasonable, which helps to improve the support performance and bearing capacity, and also helps to improve the running smoothness of the seat bracket.

[0080] Preferably, the angle β is between 68° and 128°.

[0081] By making the angle α and the angle β both within a reasonable range, when the backrest mounting plate 10 is located at the unfolded position, the forces between the connecting rods supporting the front end and the rear end of the backrest mounting plate 10 are more reasonable.

[0082] like Figure 5 As shown, the seat frame mounting member 40 is hinged to the driving plate 23 at the sixth hinge point A, the line connecting the third hinge point C and the fourth hinge point B is the line L5, the line connecting the fourth hinge point B and the sixth hinge point A is the line L6, and the size of the line L5 is greater than the size of the line L6. With the above-mentioned size setting, the rear end of the front backrest link 21 and the lower end of the rear backrest link 22 have a suitable distance, and during the movement of the driving plate 23, the front backrest link 21 and the rear backrest link 22 can have a suitable movement stroke.

[0083] The ratio of the size of the connecting line L5 to the size of the connecting line L6 is between 1.71 and 2.55. The above ratio range is adopted to make the rear end of the front backrest connecting rod 21 and the lower end of the rear backrest connecting rod 22 have a suitable distance.

[0084] Among them, the ratio of the size of the connection line L5 to the size of the connection line L6 can be 1.71, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.55 and any value between 1.71 and 2.55.

[0085] like Figure 5 As shown, the line connecting the fourth hinge point B and the sixth hinge point A is the line L6, the line connecting the third hinge point C and the sixth hinge point A is the line L7, and the size of the line L6 is smaller than the size of the line L7. With the above-mentioned size setting, the rear end of the front backrest link 21 and the lower end of the rear backrest link 22 are both at a suitable distance from the rotation center, and during the movement of the driving plate 23, the front backrest link 21 and the rear backrest link 22 can have a suitable movement stroke.

[0086] The ratio of the size of the connecting line L7 to the size of the connecting line L6 is between 1.46 and 2.18. With the above ratio range, the rear end of the front backrest connecting rod 21 and the lower end of the rear backrest connecting rod 22 are both at a suitable distance from the rotation center.

[0087] Among them, the ratio of the size of the connection line L7 to the size of the connection line L6 can be 1.46, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.18 and any value between 1.46 and 2.18.

[0088] In the first embodiment, when the backrest mounting plate 10 is switched from the folded position to the unfolded position, the front end of the backrest mounting plate 10 moves forward and downward. Through the above-mentioned motion trajectory, the front end of the backrest mounting plate 10 can move forward relative to the seat frame mounting member, so that the sofa with such a backrest can achieve the zero wall-rest function. At the same time, the downward movement reduces the height of the backrest when the sofa is in a lying position, and is lower from the ground, which can improve the comfort of the user when lying.

[0089] When the seat support is switched between the sitting position, the TV position and the lying position, the distance between the backrest mounting plate 10 of the backrest mechanism 60 and the preset vertical plane is greater than or equal to 0. Specifically, when the seat support is in the sitting position, the distance between the backrest mounting plate 10 and the preset vertical plane is equal to 0. When the seat support is in the TV position, the distance between the backrest mounting plate 10 and the preset vertical plane is greater than 0. When the seat support is in the lying position, the distance between the backrest mounting plate 10 and the preset vertical plane is equal to 0. Avoid interference between the backrest and the wall to achieve the zero wall-leaning function of the sofa.

[0090] When the backrest mounting plate 10 is switched from the folded position to the unfolded position, the rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 is between 24° and 40°. The above angle range enables the backrest mounting plate 10 to have a suitable reclining angle.

[0091] Among them, the rotation angle of the backrest mounting plate 10 relative to the seat frame mounting component 40 can be 24°, 25°, 28°, 30°, 32°, 35°, 38°, 40° and any value between 24° and 40°.

[0092] When the rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 is between 25° and 35°, the reclining angle of the backrest mounting plate 10 makes the user feel more comfortable, preferably 32°.

[0093] like Figure 1 and Figure 3As shown, when the backrest mounting plate 10 is in the folded position, the hinge point of the seat frame mounting member 40 and the drive plate 23 is located in front of the rear end of the front backrest connecting rod 21, and when the backrest mounting plate 10 is in the unfolded position, the hinge point of the seat frame mounting member 40 and the drive plate 23 is located behind the rear end of the front backrest connecting rod 21. Through the above arrangement, the hinge point of the drive plate 23 swings from the back to the front in a fan-shaped path, which can make the front backrest connecting rod 21 have a suitable motion trajectory, thereby moving the backrest mounting plate 10 forward.

[0094] In the first embodiment, an external force is applied to the limiting end of the driving plate 23, so that the driving plate 23 rotates relative to the seat frame mounting member 40, and then the front backrest connecting rod 21 moves up and the rear backrest connecting rod 22 moves down through the first four-bar linkage formed by the backrest mounting plate 10, the front backrest connecting rod 21, the rear backrest connecting rod 22 and the driving plate 23, so that the front end of the backrest mounting plate 10 moves up and the rear end moves down, so as to realize the reclining of the backrest mounting plate 10. And the front backrest connecting rod 21 moves forward through the second four-bar linkage formed by the front backrest connecting rod 21, the driving plate 23, the seat frame mounting member 40 and the limiting rod 24, so as to drive the backrest mounting plate 10 to move forward.

[0095] like Figures 6 to 12 As shown, embodiment 2 of the present invention provides a seat bracket, which includes a mounting base fixed relative to the ground, a seat frame mounting component 40, a footrest mechanism 50 and a backrest mechanism 60, the seat frame mounting component 40 is movably connected to the mounting base, and the seat frame mounting component 40 can move relative to the mounting base; the footrest mechanism 50 is hinged to the front end of the seat frame mounting component 40; the driving plate 23 of the backrest mechanism 60 is hinged to the mounting base and the seat frame mounting component 40, respectively, and the backrest mechanism 60 is the backrest mechanism 60 provided above. By adopting the above-mentioned seat bracket, an external force is applied to the limiting end of the driving member, so that the driving member can rotate relative to the seat frame mounting member 40. Since the front backrest connecting rod 21 and the rear backrest connecting rod 22 are hinged to the seat frame mounting member 40 through the driving member, the driving member can drive the front backrest connecting rod 21 and the rear backrest connecting rod 22 to move. The front end of the front backrest connecting rod 21 drives the front end of the backrest mounting plate 10 to move, and the upper end of the rear backrest connecting rod 22 drives the rear end of the backrest mounting plate 10 to move, thereby enabling the backrest mounting plate 10 to move relative to the seat frame mounting member 40, making the relative position of the backrest mounting plate 10 and the seat frame mounting member 40 more flexible. When the backrest mounting plate 10 switches from the folded position to the unfolded position, the backrest mounting plate 10 can move forward a greater distance relative to the seat frame mounting member 40, thereby solving the interference problem between the backrest and the wall and realizing the zero wall-leaning function of the sofa. Furthermore, since the front backrest connecting rod 21 and the rear backrest connecting rod 22 are both hinged on the driving member, the linkage performance between the connecting rods is enhanced during the movement of the backrest mounting plate 10, thereby enhancing the bearing capacity, stability and movement smoothness of the sofa.

[0096] Among them, the footrest mechanism 50 has an extended position extended relative to the seat frame mounting member 40 and a retracted position retracted relative to the seat frame mounting member 40. The lying posture of the seat frame corresponds to the footrest mechanism 50 being in the extended position and the backrest mounting plate 10 being in the expanded position, the TV posture of the seat frame corresponds to the footrest mechanism 50 being in the extended position and the backrest mounting plate 10 being in the folded position, and the sitting posture of the seat frame corresponds to the footrest mechanism 50 being in the retracted position and the backrest mounting plate 10 being in the folded position.

[0097] It should be noted that the installation base can be a floor-standing bracket structure.

[0098] Specifically, the seat frame mounting member 40 includes a seat frame and a seat frame connecting plate connected to the rear end of the seat frame, the mounting surface of the seat frame mounting member 40 is arranged on the seat frame, and the driving plate 23 and the limiting rod 24 are respectively hinged to the seat frame connecting plate. The seat frame connecting plate can be integrally formed with the seat frame, or connected by bolts or rivets.

[0099] In the second embodiment, the mounting base is the armrest mounting plate 30, and the seat bracket further includes a suspension assembly 70 and a movable assembly 80. The suspension assembly 70 is swingably arranged on the seat frame mounting member 40, and the front end and the rear end of the suspension assembly 70 are movably connected to the armrest mounting plate 30 through the movable assembly 80. With the above structure, the relative movement of the seat frame mounting member 40 and the armrest mounting plate 30 can be achieved by using the suspension assembly 70 and the movable assembly 80.

[0100] like Fig.12 As shown, the distance K1 between the lower surface of the armrest mounting plate 30 and the ground is between 11 cm and 17 cm. With the above dimensions, a certain space can be left between the armrest mounting plate 30 and the ground, thereby realizing the high leg function of the seat support.

[0101] The distance K1 between the lower surface of the handrail mounting plate 30 and the ground can be 11 cm, 12 cm, 13 cm, 14 cm, 15 cm, 16 cm, 17 cm, or any value between 11 cm and 17 cm. K1 is preferably 12 cm to 14 cm.

[0102] like Figure 6 and Fig.10As shown, the suspension assembly 70 includes a front swing rod 71, a transition swing rod 72 and a rear swing rod 73. The upper end of the front swing rod 71 and the upper end of the rear swing rod 73 are respectively hinged to the seat frame mounting member 40, the lower end of the front swing rod 71 and the lower end of the rear swing rod 73 are respectively hinged to the transition swing rod 72, and the front end and the rear end of the transition swing rod 72 are respectively movably connected to the armrest mounting plate 30 through the movable assembly 80. With the above-mentioned suspension assembly 70, the relative swing of the seat frame mounting member 40 and the transition swing rod 72 can be achieved through the swing of the front swing rod 71 and the rear swing rod 73, and the relative swing of the transition swing rod 72 and the armrest mounting plate 30 can be achieved through the movable assembly 80.

[0103] like Figure 6 As shown, the movable assembly 80 includes a slide rail 81 and a pulley slidably disposed in the slide rail 81, one of the pulley and the slide rail 81 is disposed on the suspension assembly 70, and the other of the pulley and the slide rail 81 is disposed on the armrest mounting plate 30. With the movable assembly 80, the relative movement of the suspension assembly 70 and the armrest mounting plate 30 can be achieved through the sliding of the pulley in the slide rail 81, so as to achieve the relative movement of the seat frame mounting member 40 and the armrest mounting plate 30.

[0104] In this embodiment, the pulley is arranged on the transition swing rod 72 , and the slide rail 81 is fixedly arranged on the armrest mounting plate 30 .

[0105] like Figure 7 As shown, the movable assembly 80 includes a first link 83, a second link 84 and a third link 85, the lower end of the first link 83 and the lower end of the second link 84 are respectively hinged to the armrest mounting plate 30, the upper end of the first link 83 is hinged to the middle of the third link 85, the upper end of the second link 84 is hinged to the rear end of the third link 85, and the front end of the third link 85 is hinged to the suspension assembly 70. With the above movable assembly 80, the first link 83 and the second link 84 can rotate relative to the armrest mounting plate 30, drive the third link 85 to move relative to the armrest mounting plate 30, realize the relative movement of the suspension assembly 70 and the armrest mounting plate 30, and realize the relative movement of the seat frame mounting member 40 and the armrest mounting plate 30.

[0106] In this embodiment, the third connecting rod 85 is hinged to the rear end of the transition swing rod 72 .

[0107] In the second embodiment, the front end of the suspension assembly 70 is movably connected to the armrest mounting plate 30 through the movable assembly 80 of the pulley rail structure, and the rear end of the suspension assembly 70 is movably connected to the armrest mounting plate 30 through the movable assembly 80 of the connecting rod structure. This makes the front end structure of the seat bracket more compact, which helps to reduce the overall thickness of the seat bracket, thereby achieving a larger space under the armrest mounting plate 30 when the height of the seat frame mounting member 40 remains unchanged, which helps to achieve true high feet.

[0108] It should be noted that the front end and the rear end of the suspension component 70 can be movably connected to the armrest mounting plate 30 through the movable component 80 of the pulley and slide rail structure at the same time; or, the front end and the rear end of the suspension component 70 can be movably connected to the armrest mounting plate 30 through the movable component 80 of the connecting rod structure at the same time; or, the front end of the suspension component 70 is movably connected to the armrest mounting plate 30 through the movable component 80 of the connecting rod structure, and the rear end of the suspension component 70 is movably connected to the armrest mounting plate 30 through the movable component 80 of the pulley and slide rail structure.

[0109] In the second embodiment, the movable assembly 80 of the three-link structure can be basically hidden in the projection area of ​​the backrest mechanism, thereby reducing the pressure and interference on the soft bag installed on the seat frame mounting member.

[0110] like Figure 6 and Figure 7 As shown, the seat support further includes a front drive rod 92 and a rear drive rod 93, the front end of the front drive rod 92 is hinged to the footrest mechanism 50, the rear end of the front drive rod 92 is hinged to the suspension assembly 70, the upper end of the rear drive rod 93 is hinged to the limiting end of the drive plate 23, and the lower end of the rear drive rod 93 is hinged to the armrest mounting plate 30. The front drive rod 92 can make the suspension assembly 70 and the footrest mechanism 50 form a linkage, and the rear drive rod 93 can flexibly connect the drive plate 23 and the armrest mounting plate 30 to limit the drive plate 23 so that it can rotate relative to the seat frame mounting member 40.

[0111] In this embodiment, the rear end of the front driving rod 92 is hingedly connected to the middle part of the rear swing rod 73.

[0112] like Figure 6As shown, the footrest mechanism 50 includes a footrest driving plate 51, an inner bench plate 52, an outer bench plate 53, a rear bench plate 54, a first front bench connecting rod 55, a second front bench connecting rod 56, a front bench plate 57, a front footrest 58 and a rear footrest 59. The rear end of the footrest driving plate 51 is hinged to the front end of the front driving rod 92, the middle part of the footrest driving plate 51 is hinged to the seat frame mounting member 40, the front end of the footrest driving plate 51 is hinged to the rear end of the outer bench plate 53, the middle part of the outer bench plate 53 is hinged to the middle part of the inner bench plate 52, the front end of the outer bench plate 53 is hinged to the rear end of the first front bench connecting rod 55, the middle part of the first front bench connecting rod 55 is hinged to the middle part of the rear bench plate 54, and the first front bench connecting rod The front end of 55 is hinged to the rear end of the second front stool connecting rod 56, the middle part of the second front stool connecting rod 56 is hinged to the middle part of the rear footstool 59, the front end of the second front stool connecting rod 56 is hinged to the rear end of the front footstool 58, the rear end of the front stool board 57 is hinged to the front end of the rear footstool 59, the front end of the front stool board 57 is hinged to the front end of the front footstool 58, the front end of the rear stool board 54 is hinged to the rear end of the rear footstool 59, the rear end of the rear stool board 54 is hinged to the front end of the inner stool board 52, and the rear end of the inner stool board 52 is hinged to the seat frame mounting part 40, wherein a limit button 531 is provided on the outer stool board 53, and after the footstool mechanism 50 is unfolded, the limit button 531 fits with the inner stool board 52.

[0113] In the second embodiment, the footrest mechanism 50 has a plurality of four-bar linkages, wherein the footrest driving plate 51, the seat frame mounting member 40, the inner bench plate 52 and the outer bench plate 53 constitute a four-bar linkage, the inner bench plate 52, the outer bench plate 53, the rear bench plate 54 and the first front bench connecting rod 55 constitute a four-bar linkage, the rear bench plate 54, the first front bench connecting rod 55, the second front bench connecting rod 56 and the rear footrest 59 constitute a four-bar linkage, and the second front bench connecting rod 56, the front bench plate 57, the front footrest 58 and the rear footrest 59 constitute a four-bar linkage. By driving one of the components of the footrest mechanism 50 to move, the plurality of four-bar linkages can be deformed so that the footrest mechanism 50 can be deployed or retracted.

[0114] Among them, the footstool mechanism 50 of the present application is composed of six connecting rods. Compared with the four connecting rods in the prior art, the setting of six connecting rods can shorten the length of each connecting rod itself accordingly, so that the thickness of the footstool mechanism in the vertical space is reduced when it is in the retracted state, which also helps to reduce the overall thickness of the iron frame and help to achieve true high feet.

[0115] In other embodiments, the limit button 531 may be set at other positions, may be set to abut against the connecting rod of the suspension assembly 70, or may be set at both positions, which can also achieve the goal of limiting the over-extension of the footrest mechanism 50.

[0116] like Fig. 9As shown, the seat support also includes a linear drive, a front drive tube 90 and a rear drive tube 91, the front drive tube 90 and the rear drive tube 91 are arranged at intervals in the front-to-back direction, the front drive tube 90 is connected to the footrest mechanism 50, the rear drive tube 91 is connected to the rear end of the armrest mounting plate 30, and the linear drive is hingedly arranged between the front drive tube 90 and the rear drive tube 91. The linear drive can change the distance between the front drive tube 90 and the rear drive tube 91 and rotate relative to each other, thereby realizing the deployment of the footrest mechanism 50, and then through the cooperation of the front drive rod 92, the suspension assembly 70, the movable assembly 80 and the rear drive rod 93, the backrest mounting plate 10 is reclined.

[0117] Among them, the front driving pipe 90 is connected to the inner bench plate 52.

[0118] Specifically, in the second embodiment, under the drive of the linear actuator, the distance between the front drive tube 90 and the rear drive tube 91 increases, and the front drive tube 90 rotates, and the front drive tube 90 drives the inner bench plate 52 to rotate relative to the seat frame mounting member, and then drives the front footrest 58 and the rear footrest 59 to unfold through the multiple four-bar linkages formed by the footrest mechanism 50. After the footrest mechanism 50 is fully unfolded, the limit button 531 fits with the inner bench plate 52 to limit the further movement of the footrest mechanism 50. Then, due to the driving of the linear actuator, the distance between the front driving tube 90 and the rear driving tube 91 continues to increase, and the footrest mechanism 50 drives the seat frame mounting member 40 forward through its footrest driving plate 51 and the inner seat plate 52. At the same time, the seat frame mounting member 40 drives the rear swing rod 73 forward through the front driving rod 92, and the rear swing rod 73 drives the transition swing rod 72 forward. The pulley of the transition swing rod 72 slides in the slide rail 81 and slides from the lower end of the slide rail 81 to its upper end, and the rear end of the transition swing rod 72 drives the third connecting rod 85 forward. In addition, the slide rail 81 is tilted upward, and the angle of the seat frame mounting member 40 changes slightly. At the same time, during the forward movement of the seat frame mounting member 40, the seat frame mounting member 40 drives the driving plate 23 to move forward. During the forward movement of the driving plate 23, due to the restriction of the rear driving rod 93, the driving plate 23 rotates relative to the seat frame mounting member 40, and then the front backrest connecting rod 21 moves up and the rear backrest connecting rod 22 moves down through the first four-bar linkage formed by the backrest mounting plate 10, the front backrest connecting rod 21, the rear backrest connecting rod 22 and the driving plate 23, so that the front end of the backrest mounting plate 10 moves up and the rear end moves down, so that the backrest mounting plate 10 can be reclined. And through the second four-bar linkage formed by the front backrest connecting rod 21, the driving plate 23, the seat frame mounting member 40 and the limit rod 24, the front backrest connecting rod 21 moves forward to drive the backrest mounting plate 10 to move forward. Avoid interference between the backrest and the wall, and realize the zero wall-leaning function of the sofa.

[0119] In the second embodiment, when the sofa is switched between the lying position, the TV position and the sitting position, the distance between the upper end of the backrest and the wall is between 0 and 4.6 cm. When the sofa is in the sitting position, the distance between the upper end of the backrest and the wall is 0, when the sofa is in the TV position, the distance between the upper end of the backrest and the wall is switched from 0 to 4.6 cm, and when the sofa is in the lying position, the distance between the upper end of the backrest and the wall is switched from 4.6 cm to 0.

[0120] When the backrest mounting plate 10 of the backrest mechanism 60 is switched from the folded position to the unfolded position, the front end of the backrest mounting plate 10 first moves downward and then moves upward.

[0121] In the second embodiment, the motor end of the linear actuator is located on a side close to the front driving tube 90, thereby reducing the interference of the motor end of the linear actuator with the space below the armrest mounting plate during operation.

[0122] In the second embodiment, when the backrest mounting plate 10 of the backrest mechanism 60 is switched from the folded position to the unfolded position, the rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 is between 25° and 38°. With the above angle range, the backrest mechanism 60 has a suitable reclining angle.

[0123] The rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 can be 25°, 28°, 30°, 33°, 36° and any value between 25° and 38°.

[0124] like Figures 13 to 15 As shown, the third embodiment of the present invention provides a seat bracket, and the seat bracket of the third embodiment is different from the second embodiment in that, in the third embodiment, the suspension assembly 70 is movably connected to the armrest mounting plate 30 through the auxiliary swing assembly 100. The auxiliary swing assembly 100 includes a front swing sub-rod 101, a transition swing sub-rod 102, and a rear swing sub-rod 103. The upper end of the front swing sub-rod 101 is hinged to the middle of the transition swing rod, the lower end of the front swing sub-rod 101 is hinged to the front end of the armrest mounting plate, the front end of the transition swing sub-rod 102 is hinged to the middle of the front swing sub-rod 101, the rear end of the transition swing sub-rod 102 is hinged to the upper end of the rear swing sub-rod 103, the middle of the rear swing sub-rod 103 is hinged to the rear end of the transition swing rod, and the lower end of the rear swing sub-rod 103 is hinged to the rear end of the armrest mounting plate. By adopting the above-mentioned auxiliary swing assembly 100, when the seat frame mounting member 40 moves forward, the transition swing rod 72 can be driven forward through the front drive rod 92, and the transition swing rod 72 moves relative to the armrest mounting plate 30 through the front swing sub-rod 101 and the rear swing sub-rod 103.

[0125] In the third embodiment, the rear end of the front driving rod 92 is hinged to the middle part of the transition swing rod 72 .

[0126] In the third embodiment, since the seat bracket also applies the backrest mechanism in the first embodiment, when the backrest mounting plate 10 is switched from the folded position to the unfolded position, the backrest mounting plate 10 can move forward a greater distance relative to the seat frame mounting member 40, thereby solving the interference problem between the backrest and the wall and realizing the zero wall-leaning function of the sofa.

[0127] like Fig.14 and Fig.15 As shown, the auxiliary swing assembly 100 also includes a first swing link 104 and a second swing link 105, the front end of the first swing link 104 is hinged to the front end of the transition swing link, the rear end of the first swing link 104 is hinged to the middle of the front swing sub-rod 101, the front end of the second swing link 105 is hinged to the upper end of the front swing sub-rod 101, and the rear end of the second swing link 105 is hinged to the middle of the transition swing link. The first swing link 104 and the second swing link 105 can limit the movement trajectory of the front swing sub-rod 101, thereby limiting the movement size of the seat frame mounting member 40 relative to the armrest mounting plate 30.

[0128] like Fig.14 and Fig.15 As shown, the secondary swing assembly 100 further includes a third swing link 106 and a fixed link 107, the lower end of the third swing link 106 is hinged to the rear end of the transition swing link, the upper end of the third swing link 106 is hinged to the middle of the rear swing sub-rod 103, the upper end of the fixed link 107 is fixedly connected to the armrest mounting plate 30, and the lower end of the fixed link 107 is hinged to the lower end of the rear swing sub-rod 103. The third swing link 106 and the fixed link 107 can limit the movement trajectory of the rear swing sub-rod 103, thereby limiting the movement size of the seat frame mounting member 40 relative to the armrest mounting plate 30.

[0129] In the third embodiment, when the backrest mounting plate 10 of the backrest mechanism 60 is in the unfolded position, the angle γ between the mounting surface of the seat frame mounting member 40 and the horizontal plane is between 13° and 30°. The above angle range enables the seat frame mounting member 40 to have a larger lifting angle.

[0130] Among them, the angle γ between the mounting surface of the seat frame mounting member 40 and the horizontal plane can be 13°, 15°, 18°, 20°, 23°, 26°, 28°, 30° and any value between 13° and 30°.

[0131] In the third embodiment, when the backrest mounting plate 10 of the backrest mechanism 60 is in the unfolded position, the angle δ between the backrest mounting plate 10 and the horizontal plane is between 20° and 30°. The above angle range enables the backrest mounting plate 10 to have a larger reclining angle.

[0132] The angle δ between the backrest mounting plate 10 and the horizontal plane may be 20°, 23°, 25°, 28°, 30°, or any value between 20° and 30°.

[0133] The angle between the backrest mounting plate 10 and the horizontal plane refers to the angle between the center line of the backrest mounting plate 10 and the horizontal plane.

[0134] like Fig.13 As shown, when the backrest mounting plate 10 of the backrest mechanism 60 is in the unfolded position, the vertical distance K2 between the highest point of the footrest mechanism 50 and the highest point of the backrest mounting plate 10 is between 260 mm and 380 mm. With the above size range, the seat frame can be in a lying state, and the user's knees and chest are almost flush when using it, so as to achieve a zero-gravity experience.

[0135] Among them, the vertical distance K2 between the highest point of the footrest mechanism 50 and the highest point of the backrest mounting plate 10 can be 260mm, 280mm, 300mm, 310mm, 330mm, 350mm, 380mm and any value between 260mm and 380mm.

[0136] Embodiment 4 of the present invention provides a sofa, which includes the seat bracket provided above. By applying an external force to the limiting end of the driving member, the driving member can rotate relative to the seat frame mounting member 40. Since the front backrest connecting rod 21 and the rear backrest connecting rod 22 are hinged to the seat frame mounting member 40 through the driving member, the driving member can drive the front backrest connecting rod 21 and the rear backrest connecting rod 22 to move. The front end of the front backrest connecting rod 21 drives the front end of the backrest mounting plate 10 to move, and the upper end of the rear backrest connecting rod 22 drives the rear end of the backrest mounting plate 10 to move, so that the backrest mounting plate 10 can move relative to the seat frame mounting member 40, making the relative position of the backrest mounting plate 10 and the seat frame mounting member 40 more flexible. When the backrest mounting plate 10 switches from the folded position to the unfolded position, the backrest mounting plate 10 can move forward a greater distance relative to the seat frame mounting member 40, thereby solving the interference problem between the backrest and the wall and realizing the zero wall-leaning function of the sofa. Furthermore, since the front backrest connecting rod 21 and the rear backrest connecting rod 22 are both hinged on the driving member, the linkage performance between the connecting rods is enhanced during the movement of the backrest mounting plate 10, thereby enhancing the bearing capacity, stability and movement smoothness of the sofa.

[0137] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0138] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0139] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0140] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0141] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0142] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A backrest mechanism, characterized in that: The backrest mechanism (60) comprises: Backrest mounting plate (10); A driving assembly (20) comprises a front backrest connecting rod (21), a rear backrest connecting rod (22) and a driving member, wherein the front end of the front backrest connecting rod (21) is hinged to the front end of the backrest mounting plate (10), the upper end of the rear backrest connecting rod (22) is hinged to the rear end of the backrest mounting plate (10), the front backrest connecting rod (21) and the rear backrest connecting rod (22) are hinged to the seat frame mounting member (40) through the driving member, and the driving member is provided with a limit end capable of receiving an external force so that the driving member can rotate relative to the seat frame mounting member (40); The backrest mounting plate (10) has a folded position relative to the seat frame mounting member (40) and an extended position relative to the seat frame mounting member (40), and the driving member can drive the backrest mounting plate (10) to move between the folded position and the extended position via the front backrest connecting rod (21) and the rear backrest connecting rod (22).

2. The backrest mechanism according to claim 1, characterized in that: The driving member comprises a driving plate (23) and a limiting rod (24); the lower end of the rear backrest connecting rod (22) is hinged to the driving plate (23); the driving plate (23) is hinged to the seat frame mounting member (40); the limiting end is arranged on the driving plate (23); the limiting rod (24) is hinged to the front backrest connecting rod (21); one of the front backrest connecting rod (21) and the limiting rod (24) is hinged to the seat frame mounting member (40); the other of the front backrest connecting rod (21) and the limiting rod (24) is hinged to the driving plate (23).

3. The backrest mechanism according to claim 2, characterized in that: The upper end of the limit rod (24) is hinged to the middle part of the front backrest connecting rod (21), the lower end of the limit rod (24) is hinged to the seat frame mounting component (40), and the rear end of the front backrest connecting rod (21) is hinged to the driving plate (23).

4. The backrest mechanism according to claim 1, characterized in that: The front backrest connecting rod (21) and the rear backrest connecting rod (22) are arranged crosswise, and the rear end of the front backrest connecting rod (21) is located behind the lower end of the rear backrest connecting rod (22).

5. The backrest mechanism according to claim 1, characterized in that: When the backrest mounting plate (10) is located in the folded position, the upper end of the rear backrest connecting rod (22) is located behind its lower end, and when the backrest mounting plate (10) is located in the unfolded position, the upper end of the rear backrest connecting rod (22) is located in front of its lower end.

6. The backrest mechanism according to claim 3, characterized in that: The front end of the front backrest connecting rod (21) is hinged to the front end of the backrest mounting plate (10) at a first hinge point O, the upper end of the rear backrest connecting rod (22) is hinged to the rear end of the backrest mounting plate (10) at a second hinge point E, the lower end of the rear backrest connecting rod (22) is hinged to the drive plate (23) at a third hinge point C, the line connecting the first hinge point O and the second hinge point E is the line L1, the line connecting the second hinge point E and the third hinge point C is the line L2, the angle between the line L1 and the line L2 is the angle α, and when the backrest mounting plate (10) is in the unfolded position, the angle α is between 40° and 135°.

7. The backrest mechanism according to claim 6, characterized in that: A protruding portion (11) is arranged at the rear end of the backrest mounting plate (10), the second hinge point E is arranged at the protruding portion (11), and the protruding portion (11) is arranged to be tilted upwards.

8. The backrest mechanism according to claim 3, characterized in that: The front end of the front backrest connecting rod (21) and the front end of the backrest mounting plate (10) are hinged at a first hinge point O, the rear end of the front backrest connecting rod (21) and the drive plate (23) are hinged at a fourth hinge point B, the limit end of the drive plate (23) is a fifth hinge point D, the line connecting the first hinge point O and the fourth hinge point B is a line L3, the line connecting the fourth hinge point B and the fifth hinge point D is a line L4, the angle between the line L3 and the line L4 is an angle β, and when the backrest mounting plate (10) is in the unfolded position, the angle β is between 40° and 135°.

9. The backrest mechanism according to claim 3, characterized in that: The lower end of the rear backrest connecting rod (22) is hinged to the driving plate (23) at a third hinge point C, the rear end of the front backrest connecting rod (21) is hinged to the driving plate (23) at a fourth hinge point B, the seat frame mounting member (40) is hinged to the driving plate (23) at a sixth hinge point A, the line connecting the third hinge point C and the fourth hinge point B is line L5, the line connecting the fourth hinge point B and the sixth hinge point A is line L6, and the size of line L5 is larger than the size of line L6.

10. The backrest mechanism according to claim 9, characterized in that: The ratio of the size of the connecting line L5 to the size of the connecting line L6 is between 1.71 and 2.

55.

11. The backrest mechanism according to claim 3, characterized in that: The lower end of the rear backrest connecting rod (22) is hinged to the driving plate (23) at a third hinge point C, the rear end of the front backrest connecting rod (21) is hinged to the driving plate (23) at a fourth hinge point B, the seat frame mounting member (40) is hinged to the driving plate (23) at a sixth hinge point A, the line connecting the fourth hinge point B and the sixth hinge point A is line L6, the line connecting the third hinge point C and the sixth hinge point A is line L7, and the size of line L6 is smaller than the size of line L7.

12. The backrest mechanism according to claim 11, characterized in that: The ratio of the size of the connecting line L7 to the size of the connecting line L6 is between 1.46 and 2.

18.

13. The backrest mechanism according to claim 1, characterized in that: When the backrest mounting plate (10) switches from the folded position to the unfolded position, the front end of the backrest mounting plate (10) moves forward and downward.

14. The backrest mechanism according to claim 1, characterized in that: When the backrest mounting plate (10) switches from the folded position to the unfolded position, the rotation angle of the backrest mounting plate (10) relative to the seat frame mounting component (40) is between 24° and 40°.

15. The backrest mechanism according to claim 3, characterized in that: When the backrest mounting plate (10) is located in the folded position, the hinge point between the seat frame mounting member (40) and the drive plate (23) is located in front of the rear end of the front backrest connecting rod (21); when the backrest mounting plate (10) is located in the unfolded position, the hinge point between the seat frame mounting member (40) and the drive plate (23) is located behind the rear end of the front backrest connecting rod (21).

16. A seat support, characterized in that: The seat support comprises: a mounting base fixed relative to the ground; A seat frame mounting member (40) is movably connected to the mounting base, and the seat frame mounting member (40) is movable relative to the mounting base; A footrest mechanism (50) is hinged to the front end of the seat frame mounting member (40); A backrest mechanism (60), wherein a drive plate (23) of the backrest mechanism (60) is hinged to the mounting base and the seat frame mounting member (40) respectively, and the backrest mechanism (60) is the backrest mechanism (60) described in any one of claims 1 to 15.

17. The seat support according to claim 16, characterized in that The mounting base is an armrest mounting plate (30), and the seat bracket further comprises a suspension component (70) and a movable component (80). The suspension component (70) is swingably arranged on the seat frame mounting member (40), and the front end and the rear end of the suspension component (70) are movably connected to the armrest mounting plate (30) via the movable component (80), respectively.

18. The seat support according to claim 17, characterized in that The distance K1 between the lower surface of the handrail mounting plate (30) and the ground is between 11 cm and 17 cm.

19. The seat support according to claim 17, characterized in that: The suspension assembly (70) includes a front swing rod (71), a transition swing rod (72) and a rear swing rod (73); the upper end of the front swing rod (71) and the upper end of the rear swing rod (73) are respectively hinged to the seat frame mounting member (40); the lower end of the front swing rod (71) and the lower end of the rear swing rod (73) are respectively hinged to the transition swing rod (72); the front end and the rear end of the transition swing rod (72) are respectively movably connected to the armrest mounting plate (30) through the movable assembly (80).

20. The seat support according to claim 17, characterized in that The movable component (80) includes a slide rail (81) and a pulley slidably arranged in the slide rail (81), one of the pulley and the slide rail (81) is arranged on the suspension component (70), and the other of the pulley and the slide rail (81) is arranged on the armrest mounting plate (30).

21. The seat support according to claim 17, characterized in that The movable component (80) includes a first connecting rod (83), a second connecting rod (84) and a third connecting rod (85), the lower ends of the first connecting rod (83) and the second connecting rod (84) are respectively hinged to the armrest mounting plate (30), the upper end of the first connecting rod (83) is hinged to the middle part of the third connecting rod (85), the upper end of the second connecting rod (84) is hinged to the rear end of the third connecting rod (85), and the front end of the third connecting rod (85) is hinged to the suspension component (70).

22. The seat support according to claim 17, characterized in that The seat support further comprises a front drive rod (92) and a rear drive rod (93), the front end of the front drive rod (92) being hinged to the footrest mechanism (50), the rear end of the front drive rod (92) being hinged to the suspension assembly (70), the upper end of the rear drive rod (93) being hinged to the limiting end of the drive plate (23), and the lower end of the rear drive rod (93) being hinged to the armrest mounting plate (30); The footstool mechanism (50) comprises a footstool drive plate (51), an inner bench plate (52), an outer bench plate (53), a rear bench plate (54), a first front bench connecting rod (55), a second front bench connecting rod (56), a front bench plate (57), a front footstool (58) and a rear footstool (59), the rear end of the footstool drive plate (51) being hinged to the front end of the front drive rod (92), the middle part of the footstool drive plate (51) being hinged to the seat frame mounting plate The front end of the footrest driving plate (51) is hinged to the rear end of the outer bench plate (53), the middle part of the outer bench plate (53) is hinged to the middle part of the inner bench plate (52), the front end of the outer bench plate (53) is hinged to the rear end of the first front bench connecting rod (55), the middle part of the first front bench connecting rod (55) is hinged to the middle part of the rear bench plate (54), and the front end of the first front bench connecting rod (55) is hinged to the rear end of the first front bench connecting rod (55). The end of the front stool plate (57) is hinged to the rear end of the second front stool connecting rod (56), the middle part of the second front stool connecting rod (56) is hinged to the middle part of the rear footstool (59), the front end of the second front stool connecting rod (56) is hinged to the rear end of the front footstool (58), the rear end of the front stool plate (57) is hinged to the front end of the rear footstool (59), the front end of the front stool plate (57) is hinged to the front end of the front footstool (58), and the rear The front end of the bench board (54) is hinged to the rear end of the rear footrest (59), the rear end of the rear bench board (54) is hinged to the front end of the inner bench board (52), and the rear end of the inner bench board (52) is hinged to the seat frame mounting member (40), wherein a limit button (531) is provided on the outer bench board (53), and when the footrest mechanism (50) is unfolded, the limit button (531) is in contact with the inner bench board (52); The seat support further comprises a linear drive, a front drive tube (90) and a rear drive tube (91), wherein the front drive tube (90) and the rear drive tube (91) are arranged at intervals in the front-to-back direction, the front drive tube (90) is connected to the footrest mechanism (50), the rear drive tube (91) is connected to the rear end of the armrest mounting plate (30), and the linear drive is hingedly arranged between the front drive tube (90) and the rear drive tube (91).

23. The seat support according to claim 16, characterized in that When the backrest mounting plate (10) of the backrest mechanism (60) switches from the folded position to the unfolded position, the front end of the backrest mounting plate (10) first moves downward and then moves upward.

24. The seat support according to claim 17, characterized in that When the backrest mounting plate (10) of the backrest mechanism (60) switches from the folded position to the unfolded position, the rotation angle of the backrest mounting plate (10) relative to the seat frame mounting member (40) is between 25° and 38°.

25. The seat support according to claim 16, characterized in that When the backrest mounting plate (10) of the backrest mechanism (60) is located at the unfolded position, the angle γ between the mounting surface of the seat frame mounting member (40) and the horizontal plane is between 13° and 30°.

26. The seat support according to claim 16, characterized in that When the backrest mounting plate (10) of the backrest mechanism (60) is located at the unfolded position, an angle δ between the backrest mounting plate (10) and a horizontal plane is between 20° and 30°.

27. The seat support according to claim 16, characterized in that When the backrest mounting plate (10) of the backrest mechanism (60) is located at the unfolded position, a vertical distance K2 between the highest point of the footrest mechanism (50) and the highest point of the backrest mounting plate (10) is between 260 mm and 380 mm.

28. A sofa, characterized in that: The sofa comprises the seat frame according to any one of claims 16 to 27.

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