Backrest mechanism, seat bracket and sofa

Abstract

The utility model provides a backrest mechanism, a seat bracket and a sofa. The backrest mechanism comprises a backrest mounting plate and a backrest bracket, the driving structure is hinged to the seat frame mounting part, the driving structure, the front end of the backrest mounting plate and the rear end of the backrest mounting plate form a first four-connecting-rod mechanism, and the backrest mounting plate is provided with a folded position folded relative to the seat frame mounting part and an unfolded position leaning backwards relative to the seat frame mounting part; the driving structure can drive the backrest mounting plate to move between a folding position and an unfolding position; the limiting structure is movably arranged on the seat frame mounting piece, the limiting structure and the seat frame mounting piece form a second four-bar mechanism, and the upper end of the limiting structure is hinged to the backrest mounting plate so as to limit the motion trail of the backrest mounting plate. Through the technical scheme provided by the invention, the problem of low practicability of the backrest of the sofa in the related technology can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture, 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 our daily life, allowing people to adjust their posture according to their needs. A movable sofa usually includes two or three of the following postures: lying, TV, and sitting. Among them, a movable sofa has legs, a seat, and a backrest. By arranging soft padding on the corresponding structures, the sofa's soft seat, soft backrest, and soft footrest structures 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 known as 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 forward movement and backward tilt of the backrest of the existing sofa are controlled by the same four-link group, which greatly limits the size of the backrest structure in actual use, and has low designability and practicality. Utility Model Content

[0004] The utility model provides a backrest mechanism, a seat bracket and a sofa, so as to solve the problem of low practicality of the backrest of the sofa in the related art.

[0005] According to one aspect of the present invention, a backrest mechanism is provided, which includes: a backrest mounting plate; a driving structure, which is hingedly arranged on the seat frame mounting member, the driving structure and the front end and the rear end of the backrest mounting plate form a first four-bar linkage mechanism, the backrest mounting plate has a folded position relative to the seat frame mounting member and a deployed position relative to the seat frame mounting member, and the driving structure can drive the backrest mounting plate to move between the folded position and the deployed position; a limiting structure, which is movably arranged on the seat frame mounting member, the limiting structure and the seat frame mounting member form a second four-bar linkage mechanism, and the upper end of the limiting structure is hinged to the backrest mounting plate to limit the movement trajectory of the backrest mounting plate.

[0006] Furthermore, the backrest mechanism also includes a front backrest link, a rear backrest link and a drive plate. The front end of the front backrest link is hinged to the front end of the backrest mounting plate, the upper end of the rear backrest link is hinged to the rear end of the backrest mounting plate, the rear end of the front backrest link and the lower end of the rear backrest link are respectively hinged to the drive plate, the backrest mounting plate is hinged to the seat frame mounting piece, the drive plate has a limit end, and the backrest mounting plate, the front backrest link, the rear backrest link and the drive plate together form a first four-bar linkage.

[0007] Furthermore, the backrest mechanism also includes a limit rod, the upper end of the limit rod is hinged to the middle part of the front backrest connecting rod, and the lower end of the limit rod is hinged to the seat frame mounting member. The front backrest connecting rod, the drive plate, the seat frame mounting member and the limit rod together form a second four-bar linkage mechanism.

[0008] Furthermore, the front backrest link and the rear backrest link are arranged crosswise, and the rear end of the front backrest link is located behind the lower end of the rear backrest link.

[0009] Furthermore, when the backrest mounting plate is in 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 in the expanded 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 the 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 the second hinge point E, and the lower end of the rear backrest connecting rod and the drive plate are hinged 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, and the angle between the line L1 and the line L2 is the angle α. When the backrest mounting plate is in the expanded position, the angle α is between 40° and 135°.

[0011] Furthermore, a protrusion is provided at the rear end of the backrest mounting plate, the second hinge point E is provided on the protrusion, and the protrusion is provided 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 connecting line of the first hinge point O and the fourth hinge point B is the connecting line L3, the connecting line of the fourth hinge point B and the fifth hinge point D is the connecting line L4, and the angle between the connecting line L3 and the connecting line L4 is the angle β, and the angle β is between 40° and 135°.

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

[0014] Furthermore, when the backrest mounting plate switches from the folded position to the unfolded position, the front end of the backrest mounting plate moves forward and downward.

[0015] Furthermore, when the backrest mounting plate 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 24° and 40°.

[0016] 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 piece movably connected to the mounting base, and the seat frame mounting piece can move relative to the mounting base; a footrest mechanism hinged to the front end of the seat frame mounting piece; and a backrest mechanism, wherein the drive plate of the backrest mechanism is hinged to the mounting base and the seat frame mounting piece respectively, and the backrest mechanism is the backrest mechanism provided above.

[0017] Furthermore, when the seat support switches between a sitting position, a TV position and a lying position, the distance between the backrest mounting plate of the backrest mechanism and the preset vertical plane is greater than or equal to 0.

[0018] 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.

[0019] Furthermore, a distance K1 between the lower surface of the armrest mounting plate and the ground is between 11 cm and 17 cm.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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 provided 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 spaced apart 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.

[0024] Furthermore, 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.

[0025] 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°.

[0026] Furthermore, when the backrest mounting plate of the backrest mechanism is located in the expanded position, an angle γ between the mounting surface of the seat frame mounting member and the horizontal plane is between 13° and 30°.

[0027] Furthermore, when the backrest mounting plate of the backrest mechanism is located at the expanded position, an angle δ between the backrest mounting plate and the horizontal plane is between 20° and 30°.

[0028] Furthermore, 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.

[0029] According to another aspect of the present invention, a sofa is provided, comprising the seat bracket provided above.

[0030] According to the technical solution of the present invention, the backrest mechanism includes a backrest mounting plate, a driving structure and a limiting structure. Since the driving structure, the front end of the backrest mounting plate and the rear end of the backrest mounting plate form a first four-bar linkage, the first four-bar linkage can be deformed by utilizing the driving structure, thereby causing the backrest mounting plate to be retracted or expanded relative to the seat frame mounting member. Furthermore, since the limiting structure and the seat frame mounting member form a second four-bar linkage, when the backrest mounting plate moves, the limiting structure can be utilized to limit the movement trajectory of the backrest mounting plate, thereby allowing the backrest mounting plate to have a suitable reclining angle and forward movement distance. Compared to the method in which the forward and backward movement of the backrest are controlled by the same four-bar linkage group, the reclining and forward movement of the backrest mounting plate of this backrest mechanism are controlled by different four-bar linkages, thereby improving both design and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 A schematic structural diagram showing a backrest mounting plate of a backrest mechanism provided in accordance with a first embodiment of the present invention in an expanded position is shown;

[0033] Figure 2 Another structural schematic diagram showing the backrest mounting plate of the backrest mechanism provided in the first embodiment of the present utility model is located in the deployed position;

[0034] Figure 3 Another structural schematic diagram showing the backrest mounting plate of the backrest mechanism provided in the first embodiment of the present utility model is located in the deployed position;

[0035] Figure 4 A schematic structural diagram showing a backrest mounting plate of a backrest mechanism provided in accordance with the first embodiment of the present invention in a retracted position is shown;

[0036] Figure 5 Another structural schematic diagram showing the backrest mounting plate of the backrest mechanism provided in the first embodiment of the present utility model is located in the retracted position;

[0037] Figure 6 It shows a structural schematic diagram of a seat support in a lying position according to the second embodiment of the present invention;

[0038] Figure 7 Another structural schematic diagram of the seat support provided in the second embodiment of the present invention is shown;

[0039] Figure 8 Shown Figure 7 Enlarged view of point G in the middle;

[0040] Figure 9 It shows a structural schematic diagram of the seat support provided in the second embodiment of the present invention in the TV posture state;

[0041] Figure 10 It shows a structural schematic diagram of a seat support provided in a sitting position according to a second embodiment of the present invention;

[0042] Figure 11 Another structural schematic diagram of the seat support provided in the second embodiment of the present invention is shown;

[0043] Figure 12 A comparison diagram of three postures of the seat bracket provided according to the second embodiment of the present utility model is shown;

[0044] Figure 13 It shows a structural schematic diagram of the seat support provided in the third embodiment of the present invention in a lying position;

[0045] Figure 14 Another structural schematic diagram of the seat support provided in the third embodiment of the present invention is shown in a lying position;

[0046] Figure 15 Another structural schematic diagram of the seat support provided in the third embodiment of the present invention is shown in a lying state.

[0047] The above drawings include the following reference numerals:

[0048] 10. Backrest mounting plate; 11. Protrusion;

[0049] 21. Front backrest connecting rod; 22. Rear backrest connecting rod; 23. Drive plate; 24. Limit rod;

[0050] 30. Handrail mounting plate;

[0051] 40. Seat frame mounting parts;

[0052] 50. Footrest mechanism; 51. Footrest drive plate; 52. Inner bench plate; 53. Outer bench plate; 531. Limit button; 54. Rear bench plate; 55. First front bench connecting rod; 56. Second front bench connecting rod; 57. Front bench plate; 58. Front footrest; 59. Rear footrest;

[0053] 60. Backrest mechanism;

[0054] 70. Suspension assembly; 71. Front swing bar; 72. Transition swing bar; 73. Rear swing bar;

[0055] 80. Movable assembly; 81. Slide rail; 83. First connecting rod; 84. Second connecting rod; 85. Third connecting rod;

[0056] 90, front drive pipe; 91, rear drive pipe; 92, front drive rod; 93, rear drive rod;

[0057] 100. Auxiliary swing assembly; 101. Front swing auxiliary rod; 102. Transition swing auxiliary rod; 103. Rear swing auxiliary rod; 104. First swing link; 105. Second swing link; 106. Third swing link; 107. Fixed link. DETAILED DESCRIPTION

[0058] 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 embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way 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 making creative efforts are within the scope of protection of the present invention.

[0059] like Figures 1 to 5 As shown, an embodiment of the present invention provides a backrest mechanism 60, including a backrest mounting plate 10, a driving structure and a limiting structure. The driving structure is hingedly arranged on the seat frame mounting member 40, and the driving structure and the front end of the backrest mounting plate 10 and the rear end of the backrest mounting plate 10 form a first four-bar linkage mechanism. The backrest mounting plate 10 has a folded position relative to the seat frame mounting member 40 and a deployed position leaning back relative to the seat frame mounting member 40. The driving structure can drive the backrest mounting plate 10 to move between the folded position and the deployed position; the limiting structure is movably arranged on the seat frame mounting member 40, and the limiting structure and the seat frame mounting member 40 form a second four-bar linkage mechanism. The upper end of the limiting structure is hinged to the backrest mounting plate 10 to limit the movement trajectory of the backrest mounting plate 10.

[0060] Applying the technical solution of the present invention, the backrest mechanism includes a backrest mounting plate 10, a driving structure, and a limiting structure. Since the driving structure, the front end of the backrest mounting plate 10, and the rear end of the backrest mounting plate 10 form a first four-bar linkage, the first four-bar linkage can be deformed by utilizing the driving structure, thereby causing the backrest mounting plate 10 to be retracted or expanded relative to the seat frame mounting member 40. Furthermore, since the limiting structure and the seat frame mounting member 40 form a second four-bar linkage, when the backrest mounting plate 10 moves, the limiting structure can be utilized to limit the movement trajectory of the backrest mounting plate 10, thereby allowing the backrest mounting plate 10 to have a suitable reclining angle and forward movement distance. Compared to a method in which the forward and backward movement of the backrest are controlled by the same four-bar linkage, the reclining and forward movement of the backrest mounting plate 10 of this backrest mechanism are controlled by different four-bar linkages, thereby improving both design and practicality.

[0061] The upper end of the limiting mechanism may be hinged to the front end of the backrest mounting plate 10 to limit the movement trajectory of the front end of the backrest mounting plate 10. Alternatively, the upper end of the limiting mechanism may be hinged to the rear end of the backrest mounting plate 10 to limit the movement trajectory of the rear end of the backrest mounting plate 10.

[0062] like Figure 1 and Figure 2 As shown, the backrest mechanism 60 also includes a front backrest link 21, a rear backrest link 22 and a drive plate 23. The front end of the front backrest link 21 is hinged to the front end of the backrest mounting plate 10, the upper end of the rear backrest link 22 is hinged to the rear end of the backrest mounting plate 10, the rear end of the front backrest link 21 and the lower end of the rear backrest link 22 are respectively hinged to the drive plate 23, the backrest mounting plate 10 is hinged to the seat frame mounting part 40, the drive plate 23 has a limiting end, and the backrest mounting plate 10, the front backrest link 21, the rear backrest link 22 and the drive plate 23 together form a first four-bar linkage. By adopting the above-mentioned first four-bar linkage, by applying an external force to the drive plate 23, the drive plate 23 can be rotated relative to the seat frame mounting member 40, thereby driving the front backrest link 21 and the rear backrest link 22 to move, and the backrest mounting plate 10 can be tilted back or folded through the front backrest link 21 and the rear backrest link 22.

[0063] In this embodiment, the limiting end of the driving plate 23 refers to a part that can be used to hinge the driving plate 23 to the mounting base when the backrest mechanism 60 is applied to the seat frame, thereby limiting the movement trajectory of the driving plate 23 and allowing the driving plate 23 to rotate relative to the seat frame mounting member 40. Specifically, it can be set as a hinge hole.

[0064] like Figure 1As shown, the backrest mechanism 60 further includes a limiting rod 24, the upper end of which is hinged to the middle portion of the front backrest link 21, and the lower end of which is hinged to the seat frame mounting member 40. The front backrest link 21, the drive plate 23, the seat frame mounting member 40, and the limiting rod 24 together form a second four-bar linkage. This second four-bar linkage can limit the motion trajectory of the front backrest link 21, thereby limiting the motion trajectory of the front end of the backrest mounting plate 10.

[0065] It should be noted that the front and back in this embodiment correspond to Figure 7 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 1 Only a partial structure of the seat frame mounting member 40 is shown.

[0067] Furthermore, by adopting the above-mentioned backrest mechanism 60, since two sets of four-link mechanisms are provided, the backrest mounting plate 10 moves forward a greater distance while the backrest tilts backward at a greater angle, so that the backrest mechanism 60 can provide the user with a better zero-wall-leaning experience and zero-gravity experience when used on a sofa.

[0068] like Figure 3 As shown, the front backrest connecting rod 21 and the rear backrest connecting rod 22 are cross-arranged, and the rear end of the front backrest connecting rod 21 is located behind the lower end of the rear backrest connecting rod 22. Adopting the above structure, the motion track of the backrest mounting plate 10 can be made more flexible.

[0069] In this embodiment, the front backrest link 21 and the rear backrest link 22 do not have a direct connection structure, but are only staggered in the spatial structure.

[0070] like Figure 3 and Figure 4 As shown, when the backrest mounting plate 10 is in the folded position, the upper end of the rear backrest link 22 is located behind its lower end. When the backrest mounting plate 10 is in the extended position, the upper end of the rear backrest link 22 is located in front of its lower end. By changing the motion trajectory of the rear backrest link 22, it can adapt to the distance moved forward by the backrest mounting plate 10 driven by the second four-bar linkage, while also driving the backrest mounting plate 10 to recline at a suitable reclining angle.

[0071] like Figure 2As shown, the front end of the front backrest link 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 link 22 is hinged to the rear end of the backrest mounting plate 10 at a second hinge point E, and the lower end of the rear backrest link 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 line L1, and the line connecting the second hinge point E and the third hinge point C is line L2. The angle between lines L1 and L2 is angle α. When the backrest mounting plate 10 is in the expanded position, angle α is between 40° and 135°. Using the above range of values ​​can make the angle more reasonable, neither too large nor too small, and the force between adjacent links is better and more reasonable, which helps to improve support performance and load-bearing capacity, and also helps to improve the smooth operation of the seat frame.

[0072] Preferably, the angle α is between 68° and 128°.

[0073] like Figure 5 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 provided upward. With this arrangement, the second hinge point E can be set a certain distance upward, thereby making the angle α not too large and within a reasonable range.

[0074] 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.

[0075] like Figure 2 As shown, the front end of the front backrest link 21 is hinged to the front end of the backrest mounting plate 10 at a first hinge point O, the rear end of the front backrest link 21 is hinged to the drive plate 23 at a fourth hinge point B, the limiting 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 line L3, the line connecting the fourth hinge point B and the fifth hinge point D is line L4, and the angle between line L3 and line L4 is angle β. When the backrest mounting plate 10 is in the deployed position, angle β is between 40° and 135°. Using the above range of values ​​can make the angle more reasonable, neither too large nor too small, and the force between adjacent links is better and more reasonable, which helps to improve support performance and load-bearing capacity, and also helps to improve the smooth operation of the seat frame.

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

[0077] By ensuring that the included angle α and the included angle β are within a reasonable range, when the backrest mounting plate 10 is located in the expanded position, the forces between the connecting rods supporting the front and rear ends of the backrest mounting plate 10 are more reasonable.

[0078] like Figure 3As shown, the seat frame mounting member 40 is hingedly connected to the drive plate 23 at the sixth hinge point A. The line connecting the third hinge point C and the fourth hinge point B is line L5, and the line connecting the fourth hinge point B and the sixth hinge point A is line L6. Line L5 is larger than line L6. This dimensioning ensures an appropriate distance between the rear end of the front backrest link 21 and the lower end of the rear backrest link 22, allowing the front and rear backrest links 21, 22 to have an appropriate range of motion during movement of the drive plate 23.

[0079] 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.

[0080] The ratio of the size of the line L5 to the size of the line L6 may be 1.71, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.55, or any value between 1.71 and 2.55.

[0081] like Figure 3 As shown, the line connecting the fourth hinge point B and the sixth hinge point A is line L6, and the line connecting the third hinge point C and the sixth hinge point A is line L7. Line L6 is smaller than line L7. The above dimensions ensure that the rear end of the front backrest link 21 and the lower end of the rear backrest link 22 are both appropriately spaced from the rotation center, allowing the front backrest link 21 and the rear backrest link 22 to have an appropriate range of motion during movement of the drive plate 23.

[0082] The ratio of the dimension of the connecting line L7 to the dimension 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.

[0083] The ratio of the size of the line L7 to the size of the line L6 may be 1.46, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.18, or any value between 1.46 and 2.18.

[0084] In the first embodiment, when the backrest mounting plate 10 switches from the stowed position to the extended position, the front end of the backrest mounting plate 10 moves forward and downward. This motion allows the front end of the backrest mounting plate 10 to move forward relative to the seat frame mounting assembly, enabling a sofa with this backrest to achieve zero wall support. This downward movement also lowers the backrest when the sofa is in a reclining position, lowering it to the ground and improving the user's comfort.

[0085] When the seat frame switches between the sitting, TV, and reclining positions, the distance between the backrest mounting plate 10 of the backrest mechanism 60 and a predetermined vertical plane is greater than or equal to zero. Specifically, when the seat frame is in the sitting position, the distance between the backrest mounting plate 10 and the predetermined vertical plane is equal to zero. When the seat frame is in the TV position, the distance between the backrest mounting plate 10 and the predetermined vertical plane is greater than zero. When the seat frame is in the reclining position, the distance between the backrest mounting plate 10 and the predetermined vertical plane is equal to zero. This prevents interference between the backrest and the wall, achieving the sofa's zero-wall-rest function.

[0086] When the backrest mounting plate 10 is switched to the expanded position from the folded position, the rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 is between 24° and 40°. Adopting the above-mentioned angle range, the backrest mounting plate 10 can have a suitable reclining angle.

[0087] Among them, the rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 can be 24°, 25°, 28°, 30°, 32°, 35°, 38°, 40° and any value between 24° and 40°.

[0088] 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°.

[0089] like Figure 3 and Figure 4 As shown, when the backrest mounting plate 10 is in the retracted 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 link 21. When the backrest mounting plate 10 is in the extended 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 link 21. With this arrangement, the hinge point of the drive plate 23 swings from back to front in a fan-shaped path, which enables the front backrest link 21 to have a suitable motion trajectory, thereby causing the backrest mounting plate 10 to move forward.

[0090] In the first embodiment, an external force is applied to the limiting end of the drive plate 23, causing the drive plate 23 to rotate relative to the seat frame mounting member 40. This in turn causes the front backrest link 21 to move upward and the rear backrest link 22 to move downward via a first four-bar linkage formed by the backrest mounting plate 10, the front backrest link 21, the rear backrest link 22, and the drive plate 23. This causes the front end of the backrest mounting plate 10 to move upward and the rear end to move downward, thereby reclining the backrest mounting plate 10. Furthermore, a second four-bar linkage formed by the front backrest link 21, the drive plate 23, the seat frame mounting member 40, and the limiting rod 24 causes the front backrest link 21 to move forward, thereby driving the backrest mounting plate 10 forward.

[0091] like Figures 6 to 12As 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 drive 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 link 21 and the rear backrest link 22 are hinged to the seat frame mounting member 40 through the driving member, the driving member can drive the front backrest link 21 and the rear backrest link 22 to move. The front end of the front backrest link 21 drives the front end of the backrest mounting plate 10 to move, and the upper end of the rear backrest link 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 expanded position, the backrest mounting plate 10 can move forward a greater distance relative to the seat frame mounting member 40, solving the interference problem between the backrest and the wall and realizing the zero wall-leaning function of the sofa. Moreover, 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.

[0092] 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 retracted 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 retracted position.

[0093] It should be noted that the mounting base may be a floor-standing bracket structure.

[0094] 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 provided on the seat frame. The driving plate 23 and the limiting rod 24 are respectively hingedly connected 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.

[0095] In the second embodiment, the mounting base is an armrest mounting plate 30, and the seat frame further includes a suspension assembly 70 and a movable assembly 80. The suspension assembly 70 is swingably mounted on the seat frame mounting member 40, and the front and rear ends of the suspension assembly 70 are movably connected to the armrest mounting plate 30 via the movable assembly 80. With this structure, the suspension assembly 70 and the movable assembly 80 enable relative movement between the seat frame mounting member 40 and the armrest mounting plate 30.

[0096] like Figure 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.

[0097] The distance K1 between the lower surface of the armrest 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. Preferably, K1 is between 12 cm and 14 cm.

[0098] like Figure 7 and Figure 9 As shown, the suspension assembly 70 includes a front swing link 71, a transition swing link 72, and a rear swing link 73. The upper ends of the front swing link 71 and the upper ends of the rear swing link 73 are respectively hinged to the seat frame mounting member 40, and the lower ends of the front swing link 71 and the lower ends of the rear swing link 73 are respectively hinged to the transition swing link 72. The front and rear ends of the transition swing link 72 are respectively movably connected to the armrest mounting plate 30 via movable assemblies 80. With the above-mentioned suspension assembly 70, the relative swing between the seat frame mounting member 40 and the transition swing link 72 can be achieved through the swinging of the front swing link 71 and the rear swing link 73, and the relative swing between the transition swing link 72 and the armrest mounting plate 30 can be achieved through the movable assembly 80.

[0099] like Figure 7 As shown, the movable assembly 80 includes a slide rail 81 and a pulley slidably disposed within 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 described above, the relative movement of the suspension assembly 70 and the armrest mounting plate 30 can be achieved by sliding the pulley within the slide rail 81, thereby achieving relative movement of the seat frame mounting member 40 and the armrest mounting plate 30.

[0100] 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 .

[0101] like Figure 8As shown, the movable assembly 80 includes a first link 83, a second link 84, and a third link 85. The lower ends of the first link 83 and 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 portion 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 movable assembly 80 described above, the first link 83 and the second link 84 can rotate relative to the armrest mounting plate 30, driving the third link 85 to move relative to the armrest mounting plate 30, thereby achieving relative movement between the suspension assembly 70 and the armrest mounting plate 30, thereby achieving relative movement between the seat frame mounting member 40 and the armrest mounting plate 30.

[0102] In this embodiment, the third connecting rod 85 is hinged to the rear end of the transition swing rod 72 .

[0103] In the second embodiment, the front end of the suspension assembly 70 is movably connected to the armrest mounting plate 30 via a movable assembly 80 having a pulley and rail structure, while the rear end of the suspension assembly 70 is movably connected to the armrest mounting plate 30 via a movable assembly 80 having a connecting rod structure. This makes the front end structure of the seat frame more compact, helping to reduce the overall thickness of the seat frame. This allows for more space below the armrest mounting plate 30 while maintaining the same height of the seat frame mounting member 40, thus facilitating the implementation of true high legs.

[0104] 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 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 rail structure.

[0105] In the second embodiment, the movable assembly 80 of the three-link structure can be basically hidden within the projected area of ​​the backrest mechanism, thereby reducing the pressure and interference on the soft bag installed on the seat frame mounting member.

[0106] like Figure 7 and Figure 8As shown, the seat frame further includes a front drive rod 92 and a rear drive rod 93. The front end of the front drive rod 92 is hingedly connected to the footrest mechanism 50, and the rear end of the front drive rod 92 is hingedly connected to the suspension assembly 70. The upper end of the rear drive rod 93 is hingedly connected to the limiting end of the drive plate 23, and the lower end of the rear drive rod 93 is hingedly connected to the armrest mounting plate 30. The front drive rod 92 enables the suspension assembly 70 to be linked to the footrest mechanism 50, and the rear drive rod 93 enables the drive plate 23 to be movably connected to the armrest mounting plate 30, thereby restricting the drive plate 23 and allowing it to rotate relative to the seat frame mounting member 40.

[0107] In this embodiment, the rear end of the front drive rod 92 is hingedly connected to the middle portion of the rear swing rod 73 .

[0108] like Figure 7 As shown, the footrest mechanism 50 includes a footrest 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 footrest 58 and a rear footrest 59. The rear end of the footrest drive plate 51 is hinged to the front end of the front drive rod 92, the middle part of the footrest drive plate 51 is hinged to the seat frame mounting member 40, the front end of the footrest drive 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.

[0109] In the second embodiment, the footrest mechanism 50 comprises multiple four-bar linkages. The footrest drive plate 51, the seat frame mounting member 40, the inner bench plate 52, and the outer bench plate 53 form a four-bar linkage; the inner bench plate 52, the outer bench plate 53, the rear bench plate 54, and the first front bench link 55 form a four-bar linkage; the rear bench plate 54, the first front bench link 55, the second front bench link 56, and the rear footrest 59 form a four-bar linkage; and the second front bench link 56, the front bench plate 57, the front footrest 58, and the rear footrest 59 form a four-bar linkage. By actuating one of the components of the footrest mechanism 50, the multiple four-bar linkages can be deformed, thereby causing the footrest mechanism 50 to be deployed or retracted.

[0110] Among them, the footrest 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 footrest mechanism in the vertical space becomes smaller when it is in the retracted state, and it also helps to reduce the overall thickness of the iron frame, which helps to realize true high legs.

[0111] In other embodiments, the limit button 531 can be set at other positions, can be set to abut against the connecting rod of the suspension assembly 70, or can be set at both positions, which can also achieve the purpose of limiting the over-extension of the footrest mechanism 50.

[0112] like Figure 11 As shown, the seat frame further includes a linear actuator, a front drive tube 90, and a rear drive tube 91. The front drive tube 90 and the rear drive tube 91 are spaced apart in the front-to-back direction. The front drive tube 90 is connected to the footrest mechanism 50, and the rear drive tube 91 is connected to the rear end of the armrest mounting plate 30. The linear actuator is hingedly disposed between the front drive tube 90 and the rear drive tube 91. The linear actuator can change the distance between the front drive tube 90 and the rear drive tube 91, causing them to rotate relative to each other, thereby achieving the deployment of the footrest mechanism 50. The front drive rod 92, the suspension assembly 70, the movable assembly 80, and the rear drive rod 93 cooperate to achieve the reclining of the backrest mounting plate 10.

[0113] Among them, the front driving pipe 90 is connected to the inner bench plate 52.

[0114] Specifically, in the second embodiment, the linear actuator increases the distance between the front drive tube 90 and the rear drive tube 91, causing the front drive tube 90 to rotate, which in turn drives the inner seat plate 52 to rotate relative to the seat frame mounting assembly. This, in turn, causes the front and rear footrests 58 and 59 to deploy via the multiple four-bar linkages formed by the footrest mechanism 50. After the footrest mechanism 50 is fully deployed, the limit button 531 engages the inner seat plate 52, limiting further movement of the footrest mechanism 50. Next, due to the drive of the linear actuator, the distance between the front drive tube 90 and the rear drive tube 91 continues to increase. The footrest mechanism 50 drives the seat frame mounting member 40 forward via its footrest drive plate 51 and inner seat plate 52. Simultaneously, the seat frame mounting member 40 drives the rear swing link 73 forward via the front drive rod 92. The rear swing link 73 drives the transition swing link 72 forward. The pulley of the transition swing link 72 slides within the slide rail 81, sliding from the lower end of the slide rail 81 to its upper end. The rear end of the transition swing link 72 drives the third link 85 forward. Furthermore, the slide rail 81 is tilted upward, causing the angle of the seat frame mounting member 40 to change slightly. At the same time, as the seat frame mounting member 40 moves forward, it drives the drive plate 23 forward. During this process, the drive plate 23 rotates relative to the seat frame mounting member 40 due to the restriction of the rear drive rod 93. This, in turn, causes the front backrest link 21 to move upward and the rear backrest link 22 to move downward via the first four-bar linkage formed by the backrest mounting plate 10, the front backrest link 21, the rear backrest link 22, and the drive plate 23. This causes the front end of the backrest mounting plate 10 to move upward and the rear end to move downward, thereby reclining the backrest mounting plate 10. Furthermore, the second four-bar linkage formed by the front backrest link 21, the drive plate 23, the seat frame mounting member 40, and the limiting rod 24 causes the front backrest link 21 to move forward, driving the backrest mounting plate 10 forward. This prevents interference between the backrest and the wall, thus achieving the sofa's zero-wall-rest function.

[0115] In Example 2, when the sofa switches between a reclining position, a TV position, and a sitting position, the distance between the upper end of the backrest and the wall ranges from 0 to 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 switches from 0 to 4.6 cm. When the sofa is in the reclining position, the distance between the upper end of the backrest and the wall switches from 4.6 cm to 0.

[0116] 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.

[0117] 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.

[0118] In the second embodiment, when the backrest mounting plate 10 of the backrest mechanism 60 switches from the folded position to the extended position, the rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 is between 25° and 38°. Using this angle range, the backrest mechanism 60 has a suitable reclining angle.

[0119] The rotation angle of the backrest mounting plate 10 relative to the seat frame mounting member 40 can be 25°, 28°, 30°, 33°, 36°, or any value between 25° and 38°.

[0120] like Figures 13 to 15 As shown, the third embodiment of the present invention provides a seat bracket. The seat bracket of the third embodiment differs from the second embodiment in that, in the third embodiment, the suspension assembly 70 is movably connected to the armrest mounting plate 30 via a secondary swing assembly 100. The secondary 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.

[0121] In the third embodiment, the rear end of the front driving rod 92 is hinged to the middle portion of the transition swing rod 72 .

[0122] In embodiment three, since the seat bracket also applies the backrest mechanism in embodiment one, 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 part 40, thereby solving the interference problem between the backrest and the wall and realizing the zero wall-leaning function of the sofa.

[0123] like Figure 14 and Figure 15As shown, the auxiliary swing assembly 100 further 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, and the rear end of the first swing link 104 is hinged to the middle portion of the front swing sub-link 101. The front end of the second swing link 105 is hinged to the upper end of the front swing sub-link 101, and the rear end of the second swing link 105 is hinged to the middle portion of the transition swing link. The first swing link 104 and the second swing link 105 can limit the motion trajectory of the front swing sub-link 101, thereby limiting the movement of the seat frame mounting member 40 relative to the armrest mounting plate 30.

[0124] like Figure 14 and Figure 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, and the upper end of the third swing link 106 is hinged to the middle portion of the rear swing sub-link 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-link 103. The third swing link 106 and the fixed link 107 can limit the motion trajectory of the rear swing sub-link 103, thereby limiting the movement of the seat frame mounting member 40 relative to the armrest mounting plate 30.

[0125] In the third embodiment, when the backrest mounting plate 10 of the backrest mechanism 60 is in the extended position, the angle γ between the mounting surface of the seat frame mounting member 40 and the horizontal plane is between 13° and 30°. Using this angle range allows the seat frame mounting member 40 to have a larger lifting angle.

[0126] The angle γ between the mounting surface of the seat frame mounting member 40 and the horizontal plane can be 18°, 20°, 23°, 26°, 28° and any value between 13° and 30°.

[0127] In the third embodiment, when the backrest mounting plate 10 of the backrest mechanism 60 is in the deployed position, the angle δ between the backrest mounting plate 10 and the horizontal plane is between 20° and 30°. The above angle range allows the backrest mounting plate 10 to have a larger reclining angle.

[0128] The included 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°.

[0129] 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.

[0130] like Figure 13As shown, when the backrest mounting plate 10 of the backrest mechanism 60 is in the deployed 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. This dimension range allows the seat frame to be positioned in a reclining position with the user's knees nearly flush with their chest, achieving a zero-gravity experience.

[0131] 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.

[0132] A fourth embodiment of the present invention provides a sofa, comprising the seat bracket provided above. By applying an external force to a limiting end of a driving member, the driving member is enabled to rotate relative to a seat frame mounting member 40. Since the front backrest link 21 and the rear backrest link 22 are hingedly connected to the seat frame mounting member 40 via the driving member, the driving member can drive the front backrest link 21 and the rear backrest link 22 to move. The front end of the front backrest link 21 drives the front end of the backrest mounting plate 10, while the upper end of the rear backrest link 22 drives the rear end of the backrest mounting plate 10. This allows 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 a retracted position to an extended position, the backrest mounting plate 10 can move forward a greater distance relative to the seat frame mounting member 40, thereby resolving the problem of interference between the backrest and the wall and achieving the zero-wall-rest function of the sofa. Moreover, 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.

[0133] 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 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, they indicate the presence of features, steps, operations, devices, structures and / or combinations thereof.

[0134] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, 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 actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as 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 the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0135] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, 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 device or element 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 outline of each component itself.

[0136] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0137] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0138] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A backrest mechanism, characterized in that: The backrest mechanism (60) comprises: Backrest mounting plate (10); A driving structure is hingedly arranged on the seat frame mounting member (40), the driving structure and the front end of the backrest mounting plate (10) and the rear end of the backrest mounting plate (10) form a first four-bar linkage mechanism, the backrest mounting plate (10) has a folded position relative to the seat frame mounting member (40) and an unfolded position relative to the seat frame mounting member (40), and the driving structure can drive the backrest mounting plate (10) to move between the folded position and the unfolded position; A limiting structure is movably arranged on the seat frame mounting member (40), the limiting structure and the seat frame mounting member (40) form a second four-bar linkage mechanism, and the upper end of the limiting structure is hinged to the backrest mounting plate (10) to limit the movement trajectory of the backrest mounting plate (10).

2. The backrest mechanism according to claim 1, characterized in that: The backrest mechanism (60) further includes a front backrest link (21), a rear backrest link (22) and a drive plate (23), wherein the front end of the front backrest link (21) is hinged to the front end of the backrest mounting plate (10), the upper end of the rear backrest link (22) is hinged to the rear end of the backrest mounting plate (10), the rear end of the front backrest link (21) and the lower end of the rear backrest link (22) are respectively hinged to the drive plate (23), the backrest mounting plate (10) is hinged to the seat frame mounting member (40), the drive plate (23) has a limit end, and the backrest mounting plate (10), the front backrest link (21), the rear backrest link (22) and the drive plate (23) together form the first four-link mechanism.

3. The backrest mechanism according to claim 1, characterized in that: The backrest mechanism (60) further includes a front backrest connecting rod (21), a drive plate (23) and a limit rod (24), wherein the upper end of the limit rod (24) is hinged to the middle part of the front backrest connecting rod (21), and the lower end of the limit rod (24) is hinged to the seat frame mounting member (40), and the front backrest connecting rod (21), the drive plate (23), the seat frame mounting member (40) and the limit rod (24) together form the second four-link mechanism.

4. The backrest mechanism according to claim 2, 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 4, 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; 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 2, 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, and 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, and 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. When the backrest mounting plate (10) is in the expanded 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 provided at the rear end of the backrest mounting plate (10), the second hinge point E is provided at the protruding portion (11), and the protruding portion (11) is provided to be tilted upward.

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 driving plate (23) are hinged at a fourth hinge point B, the limiting end of the driving plate (23) is a fifth hinge point D, the connecting line between the first hinge point O and the fourth hinge point B is a connecting line L3, the connecting line between the fourth hinge point B and the fifth hinge point D is a connecting line L4, the angle between the connecting line L3 and the connecting line L4 is an angle β, and the angle β is between 40° and 135°.

9. The backrest mechanism according to claim 2, characterized in that: The lower end of the rear backrest connecting rod (22) is hinged to the drive plate (23) at a third hinge point C, the rear end of the front backrest connecting rod (21) is hinged to the drive plate (23) at a fourth hinge point B, the seat frame mounting member (40) is hinged to the drive 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 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.

11. The backrest mechanism according to claim 1, wherein: 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 member (40) is between 24° and 40°.

12. A seat bracket, 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) hingedly connected 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 11.

13. The seat support according to claim 12, wherein: When the seat support is switched between a sitting position, a TV position and a lying position, the distance between the backrest mounting plate (10) of the backrest mechanism (60) and a preset vertical plane is greater than or equal to 0.

14. The seat support according to claim 12, wherein: The mounting base is an armrest mounting plate (30), and the seat bracket further includes 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) through the movable component (80).

15. The seat support according to claim 14, 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.

16. The seat support according to claim 14, 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), 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).

17. The seat support according to claim 14, characterized in that The movable assembly (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 assembly (70), and the other of the pulley and the slide rail (81) is arranged on the armrest mounting plate (30).

18. The seat support according to claim 14, wherein: The movable assembly (80) includes a first connecting rod (83), a second connecting rod (84) and a third connecting rod (85), wherein the lower end of the first connecting rod (83) and the lower end of 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 assembly (70).

19. The seat support according to claim 14, wherein: 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) 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 footrest mechanism (50) comprises a footrest 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 footrest (58) and a rear footrest (59), wherein the rear end of the footrest drive plate (51) is hinged to the front end of the front drive rod (92), and the middle part of the footrest drive plate (51) is hinged to the seat frame. 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 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), 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 includes 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 spaced apart in the front-to-back direction, the front drive tube (90) is connected to the footrest mechanism (50), and 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).

20. The seat support according to claim 12, wherein: 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.

21. The seat support according to claim 12, wherein: 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°.

22. The seat support according to claim 12, wherein: 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°.

23. The seat support according to claim 12, wherein: 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°.

24. The seat support according to claim 12, wherein: 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.

25. A sofa, characterized in that: The sofa comprises the seat frame according to any one of claims 12 to 24.

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