Extending device and sofa

Abstract

The utility model provides a kind of stretching device and sofa, stretching device includes: support iron stand and stretching component, stretching component includes base plate, linkage assembly and backrest mechanism, backrest mechanism includes the backrest mounting plate for installing backrest pad, first front backrest connecting rod and first rear backrest connecting rod;Stretching device has sitting posture state, leisure state and lying posture state, base plate is movably arranged, to make stretching device switch between sitting posture state, leisure state and lying posture state;Backrest mechanism further includes third backrest bar and the limiting post being set on first rear backrest connecting rod, two ends of third backrest bar are respectively hinged with first front backrest connecting rod and first rear backrest connecting rod;Wherein, when stretching device is in sitting posture state or leisure state, limiting post is abutted with backrest mounting plate, to limit backrest mounting plate.Equips with the problem of not enough stable support of backrest mounting plate of iron stand floor sofa in prior art.

Description

Technical Field

[0001] This utility model relates to the field of multifunctional sofa technology, and more specifically, to an extension device and a sofa. Background Technology

[0002] A typical movable sofa includes a functional frame (also known as an extension mechanism). The frame is divided into sections based on the upholstered structure, including the backrest, seat frame, and footrest. The frame is equipped with a linear actuator that allows it to shift between sitting, relaxed (also known as TV position), and reclining positions, thus enabling the sofa to switch between these postures. Movable sofas also include floor-standing sofas with internal functional frames that are positioned on the floor.

[0003] Users require retractable sofas with functional or comfort features such as zero gravity and zero wall contact. Zero wall contact means the sofa back can be against a wall, and the sofa's position can be adjusted while maintaining this position without interference between the backrest and the wall. Zero gravity refers to a reclining position that simulates a space capsule, placing the user's legs slightly higher than their heart to reduce pressure on the spine and joints, allowing for a relaxed and stress-free experience.

[0004] However, most floor-standing iron-frame sofas have a limit button on the backrest link. When the sofa is in the sitting or relaxing position, the limit button restricts the backrest link from moving downwards, thereby indirectly restricting the backrest mounting plate from moving downwards. However, due to the hole diameter error of the parts, the indirect limiting effect of the limit button on the backrest mounting plate is not good, resulting in insufficient stability of the backrest mounting plate. Utility Model Content

[0005] The main purpose of this utility model is to provide an extension device and a sofa to solve the problem of insufficient stability of the backrest mounting plate of the existing iron frame floor sofa.

[0006] To achieve the above objectives, according to one aspect of the present invention, an extension device is provided, comprising: a supporting iron frame and an extension assembly. The supporting iron frame is disposed on a horizontal mounting base. The extension assembly includes a base plate, a linkage assembly, and a backrest mechanism. The linkage assembly is hinged to the supporting iron frame, and the base plate is hinged to the linkage assembly. The base plate is used to connect to the seat frame of a sofa. The backrest mechanism includes a backrest mounting plate for mounting a backrest cushion, a first front backrest link, and a first rear backrest link. The lower end of the first front backrest link is connected to the base plate, and the upper end of the first front backrest link is hinged to the front end of the backrest mounting plate. The first rear backrest link... The lower end of the connecting rod is hinged to the linkage assembly, and the upper end of the first rear backrest connecting rod is hinged to the rear end of the backrest mounting plate; the extension device has a sitting position, a leisure position, and a reclining position, and the base plate is movably arranged to allow the extension device to switch between the sitting position, leisure position, and reclining position; the backrest mechanism also includes a third backrest rod and a limiting post disposed on the first rear backrest connecting rod, and the two ends of the third backrest rod are respectively hinged to the first front backrest connecting rod and the first rear backrest connecting rod; wherein, when the extension device is in the sitting position or the leisure position, the limiting post abuts against the backrest mounting plate to limit the backrest mounting plate.

[0007] Furthermore, a limiting groove is provided at one end of the backrest mounting plate facing the first backrest link. The limiting groove has two interconnected limiting recesses, the shape of which is adapted to the limiting post. When the extension device is in a reclining position, the circumferential sidewall of the limiting post abuts against one of the limiting recesses. When the extension device is in a sitting or leisure position, the circumferential sidewall of the limiting post abuts against the other limiting recess.

[0008] Furthermore, when the extension device is in a reclining position, relative to the extension device being in a relaxed position, the included angle θ1 between the first front backrest link and the seat frame mounting surface of the base plate decreases, the highest point of the backrest mounting plate decreases, and the value range of the included angle θ1 between the first front backrest link and the seat frame mounting surface of the base plate is 40°≤θ1≤70°.

[0009] Furthermore, during the process of the extension device switching from a sitting position to a lying position, the horizontal movement distance d1 of the center point O of the hinge between the first front backrest link and the backrest mounting plate ranges from 280mm≤d1≤360mm.

[0010] Furthermore, when the extension device is in a lying position, the distance d2 between the radial center of the limiting column and the lower surface of the supporting iron frame is in the range of 180mm≤d2≤260mm.

[0011] Furthermore, when the extension device is in a reclining position, the included angle θ2 between the backrest mounting plate and the lower surface of the support frame ranges from 13 ≤ θ2 ≤ 30°; when the extension device is in a relaxed position, the included angle θ2 between the backrest mounting plate and the lower surface of the support frame ranges from 52° ≤ θ2 ≤ 68°; during the process of the extension device switching from a relaxed position to a reclining position, the included angle β1 between the seat frame mounting surface of the backrest mounting plate and the lower surface of the support frame ranges from 13° ≤ β1 ≤ 20°. When the extension device is in a seated position, the included angle β1 between the mounting surface of the base plate and the lower surface of the support frame is in the range of 6°≤β1≤14°; when the extension device is in a relaxed position, the included angle β1 between the mounting surface of the base plate and the lower surface of the support frame is in the range of 10°≤β1≤17°; during the process of the extension device switching from a seated position to a reclining position, the change angle δ2 of the included angle β1 between the mounting surface of the base plate and the lower surface of the support frame is in the range of 3°≤δ2≤14°.

[0012] Furthermore, the extension assembly also includes a footstool assembly, which is movably connected to the base plate. The footstool assembly includes a footrest for mounting a foot pad, an inner footboard, an outer footboard, a front footboard, and a rear footboard. The rear end of the outer footboard is hinged to the base plate, and the front end of the outer footboard is hinged to the rear end of the rear footboard. The rear end of the inner footboard is hinged to the base plate, and the front end of the inner footboard is hinged to the rear end of the front footboard. The middle portion of the outer footboard is hinged to the middle portion of the front footboard. The front end of the front footboard and the rear footboard... The front end of each part is connected to the footrest; when the extension device is in a seated position, the footrest is retracted below the seat frame; when the extension device is in a relaxed position, the footrest extends to the front of the seat frame, and the angle θ3 between the upper surface of the footrest and the lower surface of the supporting iron frame is in the range of 2°≤θ3≤10°; when the extension device is in a reclining position, the angle θ3 between the upper surface of the footrest and the lower surface of the supporting iron frame is in the range of 6°≤θ3≤14°.

[0013] Furthermore, there is one footrest. When the extension device is in a lying position, the maximum height d6 of the highest point of the footrest relative to the lower surface of the supporting iron frame is in the range of 560mm≤d6≤600mm; when the extension device is in a leisure position, the maximum height d6 of the highest point of the footrest relative to the lower surface of the supporting iron frame is in the range of 450mm≤d6≤500mm.

[0014] Furthermore, there are two footrests: one is a rear footrest, and the other is a front footrest. The front end of the front footrest is hinged to the rear footrest, and the front end of the rear footrest is hinged to the front footrest. The highest point of the rear footrest relative to the lower surface of the supporting frame is greater than the highest point of the backrest mounting plate relative to the lower surface of the supporting frame. When the extension device is in a reclining position, the footrest extends to the front of the seat frame, and the maximum height d6 of the highest point of the footrest relative to the lower surface of the supporting frame is in the range of 580mm≤d6≤630mm. When the extension device is in a relaxed position, the maximum height d6 of the highest point of the footrest relative to the lower surface of the supporting frame is in the range of 470mm≤d6≤520mm.

[0015] Furthermore, the linkage assembly includes a first linkage plate, a second linkage plate, a third linkage plate, a fourth linkage plate, and a fifth linkage plate. The lower end of the first linkage plate is hinged to the supporting iron frame, the upper end of the first linkage plate is hinged to the front end of the second linkage plate, the rear end of the second linkage plate is hinged to the base plate, the front end of the third linkage plate is hinged to the middle of the second linkage plate, the rear end of the third linkage plate is hinged to the front end of the fourth linkage plate, the lower end of the fourth linkage plate is hinged to the lower end of the base plate, the rear end of the fourth linkage plate is hinged to the first backrest connecting rod, the upper end of the fourth linkage plate is hinged to the upper end of the fifth linkage plate, and the lower end of the fifth linkage plate is hinged to the supporting iron frame.

[0016] According to another aspect of the present invention, a sofa is provided, including a seat frame, a footrest, a backrest, and the aforementioned extension device.

[0017] Applying the technical solution of this utility model, the extension device includes a supporting iron frame and an extension component. The extension component includes a base plate, a linkage component, and a backrest mechanism. The backrest mechanism includes a backrest mounting plate for mounting a backrest cushion, a first front backrest link, and a first rear backrest link. When the seat switches from a leisure state to a reclining state, the linkage component and the base plate move relative to the supporting iron frame. The linkage component tilts forward relative to the supporting iron frame, and the base plate moves upward and forward relative to the supporting iron frame and rotates counterclockwise. Since the forward tilting amplitude of the linkage component is greater than the movement amplitude of the base plate, the linkage component drives the lower end of the first rear backrest link to move downward, and the backrest mounting plate moves downward and rotates counterclockwise, causing the backrest mounting plate to tilt backward. When the extension device is in a reclining position, the limiting post abuts against the backrest mounting plate, restricting the backrest mounting plate from moving downwards and rotating counterclockwise, thus achieving better and more stable backrest support in the reclining position. When the extension device is in a sitting or relaxing position, the limiting post abuts against the backrest mounting plate, restricting the backrest mounting plate from moving upwards and rotating clockwise. This allows the limiting post to directly limit the backrest mounting plate, avoiding the indirect limiting effect of the limiting button on the backrest mounting plate due to hole diameter errors in component installation, thus achieving better and more stable backrest support in the sitting or relaxing position and improving the user experience. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of the extension device (with two footrests) in a lying position according to the present invention is shown.

[0020] Figure 2 A schematic diagram of the structure of the extension device (with two footrests) in a leisure state according to the present invention is shown;

[0021] Figure 3 A schematic diagram of the structure of the extension device (with one footrest) in a lying position according to the present invention is shown.

[0022] Figure 4 A schematic diagram of the structure of the extension device (with two footrests) in a seated position according to the present invention is shown.

[0023] Figure 5 A schematic diagram of the structure of the extension device (with one footrest) in a seated position according to the present invention is shown.

[0024] Figure 6A schematic diagram of the structure of the extension device (with one footrest) in a leisure state according to the present invention is shown;

[0025] Figure 7 The diagram illustrates the process of switching from a sitting to a lying position using the extension device (with two footrests) according to the present invention.

[0026] The above figures include the following reference numerals:

[0027] 10. Supporting iron frame; 21. Base plate; 221. First linkage plate; 222. Second linkage plate; 224. Fourth linkage plate; 225. Fifth linkage plate; 40. Backrest mechanism; 41. Backrest mounting plate; 42. First front backrest connecting rod; 43. First rear backrest connecting rod; 44. Third backrest rod; 45. Limiting post; 451. Limiting recess; 50. Footrest; 51. Inner bench; 52. Outer bench; 53. Front bench; 54. Rear bench; 55. Front footrest; 56. Rear footrest; 57. First transmission component; 58. Second transmission component; 571. Third transmission component; 1. Drive rod; 2. First transmission rod; 3. Second transmission rod. Detailed Implementation

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0030] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0031] Please refer to Figures 1 to 7 This utility model provides an extension device, including: a supporting iron frame 10 and an extension assembly. The supporting iron frame 10 is disposed on a horizontal mounting base. The extension assembly includes a base plate 21, a linkage assembly, and a backrest mechanism 40. The linkage assembly is hinged to the supporting iron frame 10, and the base plate 21 is hinged to the linkage assembly. The base plate 21 is used to connect the seat frame of the sofa. The backrest mechanism 40 includes a backrest mounting plate 41 for mounting a backrest cushion, a first front backrest link 42, and a first rear backrest link 43. The lower end of the first front backrest link 42 is connected to the base plate 21, and the upper end of the first front backrest link 42 is hinged to the front end of the backrest mounting plate 41. The lower end of the first rear backrest link 43 is hinged to the base plate 21. The upper end of the first rear backrest link 43 is hinged to the rear end of the backrest mounting plate 41 in connection with the linkage component; the extension device has a sitting state, a leisure state, and a reclining state, and the base plate 21 is movably arranged to allow the extension device to switch between the sitting state, the leisure state, and the reclining state; the backrest mechanism 40 also includes a third backrest rod 44 and a limiting post 45 disposed on the first rear backrest link 43, the two ends of the third backrest rod 44 being hinged to the first front backrest link 42 and the first rear backrest link 43 respectively; wherein, when the extension device is in the sitting state or the leisure state, the limiting post 45 abuts against the backrest mounting plate 41 to limit the backrest mounting plate 41.

[0032] The extension device of this utility model includes a supporting iron frame 10 and an extension assembly. The extension assembly includes a base plate 21, a linkage assembly, and a backrest mechanism 40. The backrest mechanism 40 includes a backrest mounting plate 41 for mounting a backrest cushion, a first front backrest link 42, and a first rear backrest link 43. When the seat switches from a leisure state to a reclining state, the linkage assembly and the base plate 21 move relative to the supporting iron frame 10. The linkage assembly tilts forward relative to the supporting iron frame 10, and the base plate 21 moves upward and forward relative to the supporting iron frame 10 and rotates counterclockwise. Since the forward tilting amplitude of the linkage assembly is greater than the movement amplitude of the base plate 21, the linkage assembly drives the lower end of the first rear backrest link 43 to move downward, and the backrest mounting plate 41 moves downward and rotates counterclockwise, causing the backrest mounting plate 41 to tilt backward. When the extension device is in a reclining position, the limiting post 45 abuts against the backrest mounting plate 41, restricting the backrest mounting plate 41 from moving downwards and rotating counterclockwise, thus achieving better and more stable backrest support in the reclining position. When the extension device is in a sitting or relaxing position, the limiting post 45 abuts against the backrest mounting plate 41, restricting the backrest mounting plate 41 from moving upwards and rotating clockwise, allowing the limiting post 45 to directly limit the backrest mounting plate 41. This avoids the indirect limiting effect of the limiting post on the backrest mounting plate due to hole diameter errors in component installation, thus achieving better and more stable backrest support in the sitting or relaxing position and improving the user experience.

[0033] Specifically, with Figure 1 The directions shown are defined as clockwise and counterclockwise.

[0034] In specific implementation, when the first rear backrest link 43 moves downward, its upper end moves downward and approaches the base plate 21, thereby deforming the four-bar linkage formed by the first front backrest link 42, the backrest mounting plate 41, the first rear backrest link 43, and the third backrest link 44. This causes the third backrest link 44 to tilt, simultaneously causing the backrest mounting plate 41 to tilt backward. Furthermore, during the downward movement of the first rear backrest link 43, the third backrest link 44 is also moved downward, and the third backrest link 44 causes the first front backrest link 42 to rotate relative to it, resulting in a fold between the two.

[0035] Specifically, the extension device also includes a drive mechanism, which includes a linear actuator (not shown in the figure), a drive rod 1, a first transmission rod 2 fixed to the drive rod 1, and a second transmission rod 3 hinged to the first transmission rod 2. The other end of the second transmission rod 3 is hinged to the inner bench 51. The drive rod 1 is drivenly connected to the base plate 21. When the extension device switches from a sitting position to a relaxed position, the linear actuator can drive the drive rod 1 to rotate around its axis and move the drive rod 1 forward and upward. When the drive rod 1 rotates, it can drive the first transmission rod 2 and the second transmission rod 3 to extend, thereby driving the inner bench 51 to unfold, thus realizing the extension of the footrest assembly, so that the footrest 50 extends to the front of the seat frame. When the extension device switches from a relaxed position to a reclining position, the linear actuator continues to drive the drive rod 1 to move forward and upward until the footrest assembly reaches the fully extended state. Then the linear actuator continues to drive the drive rod 1 to move forward and upward, so that the drive rod 1 drives the base plate 21 to move forward and upward. The base plate 21 drives the backrest mechanism 40 to deform through the linkage assembly, so as to realize the backrest mounting plate 41 tilting backward.

[0036] In this embodiment, a limiting groove is provided at one end of the backrest mounting plate 41 facing the first backrest connecting rod 43. The limiting groove has two interconnected limiting recesses 451, the shape of which is adapted to the limiting post 45. When the extension device is in a reclining position, the circumferential sidewall of the limiting post 45 abuts against one limiting recess 451. When the extension device is in a sitting or leisure position, the circumferential sidewall of the limiting post 45 abuts against the other limiting recess 451.

[0037] Specifically, since the shape of the limiting recess 451 is adapted to the limiting post 45, when the extension device is in a reclining position, the circumferential sidewall of the limiting post 45 abuts against one of the limiting recesses 451, so that the limiting post 45 can effectively restrict the backrest mounting plate 41 from moving downward and rotating counterclockwise, avoiding relative sliding between the limiting post 45 and the backrest mounting plate 41, resulting in a poor limiting effect of the limiting post 45; when the extension device is in a sitting or leisure position, the circumferential sidewall of the limiting post 45 abuts against another limiting recess 451, so that the limiting post 45 can effectively move upward and rotate clockwise, avoiding relative sliding between the limiting post 45 and the backrest mounting plate 41, resulting in a poor limiting effect of the limiting post 45, thereby strengthening the support stability of the backrest mounting plate 41.

[0038] In this embodiment, when the extension device is in a reclining position, relative to the extension device being in a relaxed position, the included angle θ1 between the first front backrest link 42 and the seat frame mounting surface of the base plate 21 decreases, the highest point of the backrest mounting plate 41 is lowered, and the value range of the included angle θ1 between the first front backrest link 42 and the seat frame mounting surface of the base plate 21 is 40°≤θ1≤70°.

[0039] Specifically, by setting the included angle θ1 between the first front backrest link 42 and the seat frame mounting surface of the base plate 21 to a range of 40°≤θ1≤70°, it is possible to ensure that an acute angle is formed between the first front backrest link 42 and the seat frame mounting surface of the base plate 21, thereby reducing the height of the front end of the backrest mounting plate 41 in the vertical direction and making the highest point of the backrest mounting plate 41 lower, which helps to enhance the zero-gravity experience; at the same time, it can reduce the gap between the backrest mounting plate 41 and the base plate 21 when the extension device is in a reclining position, reducing the risk of the user being pinched.

[0040] Specifically, the included angle θ1 between the first front backrest link 42 and the seat frame mounting surface of the base plate 21 can be any value between 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, and 40° to 70°.

[0041] It should be noted that when the included angle θ1 between the first front backrest link 42 and the seat frame mounting surface of the base plate 21 is between 54° and 58°, the height of the backrest can be lower, and the zero-gravity experience of the seat is stronger.

[0042] In this embodiment, an L-shaped support plate is provided on the side of the substrate 21 to form a seat frame mounting surface. The first front backrest link 42 has one side of angle θ1 formed by the line connecting the centers of its two hinge points, and the other side forms the seat frame mounting surface of the substrate 21. Figure 1 The projection in the side view shown.

[0043] In this embodiment, as Figure 7 As shown, during the process of the extension device switching from a sitting position to a lying position, the horizontal movement distance d1 of the center point O of the hinge between the first front backrest link 42 and the backrest mounting plate 41 ranges from 280mm≤d1≤360mm.

[0044] Specifically, the horizontal movement distance d1 of the center point O of the hinge portion between the first front backrest link 42 and the backrest mounting plate 41 consists of two parts. One part is the distance that the base plate 21 moves forward (in the horizontal direction away from the wall) relative to the supporting iron frame 10 during the process of the extension device switching from a sitting position to a reclining position. The other part is the distance that the first front backrest link 42 moves forward relative to the base plate 21 during the process of the extension device switching from a sitting position to a reclining position. This makes point O move a greater distance relative to the wall, effectively preventing the backrest pad on the backrest mounting plate 41 from interfering with the wall, thereby helping to achieve a zero-wall arrangement of the sofa.

[0045] In this embodiment, when the extension device is in a lying position, the distance d2 between the radial center of the limiting post 45 and the lower surface of the supporting iron frame 10 is in the range of 180mm≤d2≤260mm.

[0046] Specifically, by limiting the distance d2 between the radial center of the limiting post 45 and the lower surface of the supporting iron frame 10 to a range of 180mm≤d2≤260mm, the height of the limiting post 45 is lower, and the height of the backrest mounting plate 41 under the limiting effect can also be lower, which helps to enhance the zero-gravity experience of the sofa.

[0047] In this embodiment, when the stretching device is in a reclining position, the included angle θ2 between the backrest mounting plate 41 and the lower surface of the support frame 10 ranges from 13 ≤ θ2 ≤ 30°; when the stretching device is in a leisure position, the included angle θ2 between the backrest mounting plate 41 and the lower surface of the support frame 10 ranges from 52° ≤ θ2 ≤ 68°; during the process of the stretching device switching from a leisure position to a reclining position, the change angle δ1 of the included angle θ2 between the backrest mounting plate 41 and the lower surface of the support frame 10 ranges from 22° ≤ δ1 ≤ 55°.

[0048] Specifically, this design ensures that the reclining angle of the backrest mounting plate 41 is moderate and conforms better to the user's body structure, thereby improving the user's comfort.

[0049] Specifically, the included angle θ2 between the backrest mounting plate 41 and the lower surface of the support frame 10 refers to the included angle between the center line of the backrest mounting plate 41 in the longitudinal direction (the line connecting the center points of the two through holes on the backrest mounting plate 41) and the lower surface of the support frame 10.

[0050] In this embodiment, when the extension device is in a reclining position, the angle β1 between the mounting surface of the base plate 21 and the lower surface of the support frame 10 ranges from 13° to 20°; when the extension device is in a sitting position, the angle β1 between the mounting surface of the base plate 21 and the lower surface of the support frame 10 ranges from 6° to 14°; when the extension device is in a leisure position, the angle β1 between the mounting surface of the base plate 21 and the lower surface of the support frame 10 ranges from 10° to 17°; and during the process of the extension device switching from a sitting position to a reclining position, the change angle δ2 of the angle β1 between the mounting surface of the base plate 21 and the lower surface of the support frame 10 ranges from 3° to 14°.

[0051] Specifically, this design allows for a more relaxed seat angle, preventing the user's body from rising too much and thus improving user comfort.

[0052] In this embodiment, the extension assembly further includes a footstool assembly, which is movably connected to the base plate 21. The footstool assembly includes a footrest 50 for mounting a foot pad, an inner footrest 51, an outer footrest 52, a front footrest 53, and a rear footrest 54. The rear end of the outer footrest 52 is hinged to the base plate 21, and the front end of the outer footrest 52 is hinged to the rear end of the rear footrest 54. The rear end of the inner footrest 51 is hinged to the base plate 21, and the front end of the inner footrest 51 is hinged to the rear end of the front footrest 53. The middle portion of the outer footrest 52 is hinged to the middle portion of the front footrest 53. The front end of the board 53 and the front end of the back bench 54 are both connected to the footrest 50; when the extension device is in a sitting position, the footrest 50 is retracted below the seat frame; when the extension device is in a relaxed position, the footrest 50 extends to the front of the seat frame, and the angle θ3 between the upper surface of the footrest 50 and the lower surface of the supporting iron frame 10 is in the range of 2°≤θ3≤10°; when the extension device is in a reclining position, the angle θ3 between the upper surface of the footrest 50 and the lower surface of the supporting iron frame 10 is in the range of 6°≤θ3≤14°.

[0053] Specifically, this design makes the angle of the footrest 50 more gradual, resulting in a more relaxed position for the user's lower legs or feet, thus improving user comfort. When there are two footrests 50, one is the rear footrest 56, and the other is the front footrest 55. When the extension device is in a relaxed state, the angle θ3 between the upper surface of the front footrest 55 and the lower surface of the supporting frame 10 ranges from 2° to 10°; when the extension device is in a reclining state, the angle θ3 between the upper surface of the front footrest 55 and the lower surface of the supporting frame 10 ranges from 6° to 14°.

[0054] In this embodiment, as Figure 3 As shown, there is one footrest 50. When the extension device is in a lying position, the maximum height d6 of the highest point of the footrest 50 relative to the lower surface of the supporting iron frame 10 is in the range of 560mm≤d6≤600mm. When the extension device is in a leisure position, the maximum height d6 of the highest point of the footrest 50 relative to the lower surface of the supporting iron frame 10 is in the range of 450mm≤d6≤500mm.

[0055] Specifically, the maximum height d6 of the highest point of the footrest 50 relative to the lower surface of the support frame 10 is greater than the height of the highest point of the backrest mounting plate 41 relative to the lower surface of the support frame 10. By setting the range of d6, it can be better ensured that the user's legs are roughly level with or slightly higher than the heart, achieving the technical effect of zero gravity.

[0056] Preferably, the footrest 50 is a single piece, with d6 being 580mm when the extension device is in a lying position and 488mm when the extension device is in a relaxed position.

[0057] In this embodiment, there are two footrests 50. One of the two footrests 50 is a rear footstool 56, and the other footrest 50 is a front footstool 55. The front end of the front footstool 53 is hinged to the rear footstool 56, and the front end of the rear footstool 54 is hinged to the front footstool 55. The height of the highest point of the rear footstool 56 relative to the lower surface of the supporting frame 10 is greater than the height of the highest point of the backrest mounting plate 41 relative to the lower surface of the supporting frame 10. When the extension device is in a reclining position, the footrests 50 extend to the front of the seat frame. The maximum height d6 of the highest point of the footrest 50 relative to the lower surface of the supporting frame 10 is in the range of 580mm≤d6≤630mm. When the extension device is in a relaxed position, the maximum height d6 of the highest point of the footrest 50 relative to the lower surface of the supporting frame 10 is in the range of 470mm≤d6≤520mm.

[0058] Specifically, the maximum height d6 of the highest point of the footrest 50 relative to the lower surface of the support frame 10 refers to the height of the highest point of the front footrest 55 relative to the lower surface of the support frame 10. By setting the range of values ​​for d6, it is possible to better ensure that the user's legs are roughly level with or slightly higher than the heart, achieving the technical effect of zero gravity.

[0059] Preferably, there are two footrests 50. When the extension device is in a reclining position, the highest point of the front footrest 55 is 625mm above the lower surface of the supporting iron frame 10, and the highest point of the rear footrest 56 is 585mm above the lower surface of the supporting iron frame 10. When the extension device is in a relaxing position, the highest point of the front footrest 55 is 507mm above the lower surface of the supporting iron frame 10, and the highest point of the rear footrest 56 is 481mm above the lower surface of the supporting iron frame 10.

[0060] Specifically, there are two footrests 50. The footstool assembly also includes a first transmission member 57, a second transmission member 58, and a third transmission member 571. The front end of the first transmission member 57 is hinged to the front footstool 53, the middle part of the first transmission member 57 is hinged to the rear footstool 54, the rear end of the first transmission member 57 is hinged to the lower end of the second transmission member 58, the upper end of the second transmission member 58 is hinged to the middle part of the front footstool 55, the lower end of the third transmission member 571 is hinged to the middle part of the second transmission member 58, and the upper end of the third transmission member 571 is hinged to the rear footstool 56.

[0061] In this embodiment, the linkage assembly includes a first linkage plate 221, a second linkage plate 222, a third linkage plate, a fourth linkage plate 224, and a fifth linkage plate 225. The lower end of the first linkage plate 221 is hinged to the supporting iron frame 10, the upper end of the first linkage plate 221 is hinged to the front end of the second linkage plate 222, the rear end of the second linkage plate 222 is hinged to the base plate 21, the front end of the third linkage plate is hinged to the middle part of the second linkage plate 222, the rear end of the third linkage plate is hinged to the front end of the fourth linkage plate 224, the lower end of the fourth linkage plate 224 is hinged to the lower end of the base plate 21, the rear end of the fourth linkage plate 224 is hinged to the first backrest connecting rod 43, the upper end of the fourth linkage plate 224 is hinged to the upper end of the fifth linkage plate 225, and the lower end of the fifth linkage plate 225 is hinged to the supporting iron frame 10.

[0062] Specifically, this arrangement ensures that the linkage component is hinged to the support frame 10, and the base plate 21 is hinged to the linkage component.

[0063] This utility model provides a sofa, including a seat frame, a footrest, a backrest, and the aforementioned extension device.

[0064] The sofa of this utility model includes a seat frame, a footrest, a backrest cushion, and the aforementioned extension device. The extension device includes a supporting iron frame 10 and an extension assembly. The extension assembly includes a base plate 21, a linkage assembly, and a backrest mechanism 40. The backrest mechanism 40 includes a backrest mounting plate 41 for mounting the backrest cushion, a first front backrest link 42, and a first rear backrest link 43. When the seat switches from a relaxed state to a reclining state, the linkage assembly and the base plate 21 move relative to the supporting iron frame 10. The linkage assembly tilts forward relative to the supporting iron frame 10, and the base plate 21 moves upward and forward relative to the supporting iron frame 10 and rotates counterclockwise. Since the forward tilting amplitude of the linkage assembly is greater than the movement amplitude of the base plate 21, the linkage assembly drives the lower end of the first rear backrest link 43 to move downward, and the backrest mounting plate 41 moves downward and rotates counterclockwise, causing the backrest mounting plate 41 to tilt backward. When the extension device is in a reclining position, the limiting post 45 abuts against the backrest mounting plate 41, restricting the backrest mounting plate 41 from moving downwards and rotating counterclockwise, thus achieving better and more stable backrest support in the reclining position. When the extension device is in a sitting or relaxing position, the limiting post 45 abuts against the backrest mounting plate 41, restricting the backrest mounting plate 41 from moving upwards and rotating clockwise, allowing the limiting post 45 to directly limit the backrest mounting plate 41. This avoids the indirect limiting effect of the limiting post on the backrest mounting plate due to hole diameter errors in component installation, thus achieving better and more stable backrest support in the sitting or relaxing position and improving the user experience.

[0065] Specifically, the base plate 21 is used to connect the seat frame of the sofa, the backrest mounting plate 41 is used to install the backrest cushion, and the footrest 50 is used to connect the footrest cushion, so that the user's feet and legs can be placed on the footrest cushion.

[0066] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0067] The extension device of this utility model includes a supporting iron frame 10 and an extension assembly. The extension assembly includes a base plate 21, a linkage assembly, and a backrest mechanism 40. The backrest mechanism 40 includes a backrest mounting plate 41 for mounting a backrest cushion, a first front backrest link 42, and a first rear backrest link 43. When the seat switches from a leisure state to a reclining state, the linkage assembly and the base plate 21 move relative to the supporting iron frame 10. The linkage assembly tilts forward relative to the supporting iron frame 10, and the base plate 21 moves upward and forward relative to the supporting iron frame 10 and rotates counterclockwise. Since the forward tilting amplitude of the linkage assembly is greater than the movement amplitude of the base plate 21, the linkage assembly drives the lower end of the first rear backrest link 43 to move downward, and the backrest mounting plate 41 moves downward and rotates counterclockwise, causing the backrest mounting plate 41 to tilt backward. When the extension device is in a reclining position, the limiting post 45 abuts against the backrest mounting plate 41, restricting the backrest mounting plate 41 from moving downwards and rotating counterclockwise, thus achieving better and more stable backrest support in the reclining position. When the extension device is in a sitting or relaxing position, the limiting post 45 abuts against the backrest mounting plate 41, restricting the backrest mounting plate 41 from moving upwards and rotating clockwise, allowing the limiting post 45 to directly limit the backrest mounting plate 41. This avoids the indirect limiting effect of the limiting post on the backrest mounting plate due to hole diameter errors in component installation, thus achieving better and more stable backrest support in the sitting or relaxing position and improving the user experience.

[0068] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0069] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0070] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stretching device, characterized in that, include: Support frame (10) and extension assembly, the support frame (10) is set on a horizontal mounting base, the extension assembly includes a base plate (21), a linkage assembly and a backrest mechanism (40), the linkage assembly is hinged to the support frame (10), the base plate (21) is hinged on the linkage assembly, and the base plate (21) is used to connect the seat frame of the sofa. The backrest mechanism (40) includes a backrest mounting plate (41) for mounting a backrest cushion, a first front backrest link (42) and a first rear backrest link (43). The lower end of the first front backrest link (42) is connected to the base plate (21), the upper end of the first front backrest link (42) is hinged to the front end of the backrest mounting plate (41), the lower end of the first rear backrest link (43) is hinged to the linkage assembly, and the upper end of the first rear backrest link (43) is hinged to the rear end of the backrest mounting plate (41). The extension device has a sitting position, a leisure position and a lying position, and the base plate (21) is movable to allow the extension device to switch between the sitting position, the leisure position and the lying position. The backrest mechanism (40) further includes a third backrest rod (44) and a limiting post (45) disposed on the first rear backrest link (43). The two ends of the third backrest rod (44) are respectively hinged to the first front backrest link (42) and the first rear backrest link (43). When the extension device is in the sitting posture or the leisure posture, the limiting post (45) abuts against the backrest mounting plate (41) to limit the backrest mounting plate (41).

2. The extension device according to claim 1, characterized in that, The backrest mounting plate (41) has a limiting groove at one end facing the first backrest connecting rod (43). The limiting groove has two interconnected limiting recesses (451). The shape of the limiting recesses (451) is adapted to the limiting post (45). When the extension device is in the lying position, the circumferential sidewall of the limiting post (45) abuts against one of the limiting recesses (451). When the extension device is in the sitting position or the leisure position, the circumferential sidewall of the limiting post (45) abuts against the other limiting recess (451).

3. The extension device according to claim 1, characterized in that, When the extension device is in the reclining position, relative to the extension device being in the leisure position, the included angle θ1 between the first front backrest link (42) and the seat frame mounting surface of the base plate (21) decreases, the highest point of the backrest mounting plate (41) decreases, and the value range of the included angle θ1 between the first front backrest link (42) and the seat frame mounting surface of the base plate (21) is 40°≤θ1≤70°.

4. The extension device according to claim 1, characterized in that, During the process of the extension device switching from the sitting position to the lying position, the horizontal movement distance d1 of the center point O of the hinge between the first front backrest link (42) and the backrest mounting plate (41) is 280mm≤d1≤360mm.

5. The extension device according to claim 2, characterized in that, When the extension device is in the lying position, the distance d2 between the radial center of the limiting post (45) and the lower surface of the supporting iron frame (10) is in the range of 180mm≤d2≤260mm.

6. The extension device according to claim 1, characterized in that, When the stretching device is in the reclining position, the included angle θ2 between the backrest mounting plate (41) and the lower surface of the support frame (10) is in the range of 13 ≤ θ2 ≤ 30°; when the stretching device is in the leisure position, the included angle θ2 between the backrest mounting plate (41) and the lower surface of the support frame (10) is in the range of 52° ≤ θ2 ≤ 68°; during the process of the stretching device switching from the leisure position to the reclining position, the change angle δ1 of the included angle θ2 between the backrest mounting plate (41) and the lower surface of the support frame (10) is in the range of 22° ≤ δ1 ≤ 55°.

7. The extension device according to claim 1, characterized in that, When the extension device is in the reclining position, the angle β1 between the seat frame mounting surface of the base plate (21) and the lower surface of the support frame (10) ranges from 13°≤β1≤20°; when the extension device is in the sitting position, the angle β1 between the seat frame mounting surface of the base plate (21) and the lower surface of the support frame (10) ranges from 6°≤β1≤14°; when the extension device is in the leisure position, the angle β1 between the seat frame mounting surface of the base plate (21) and the lower surface of the support frame (10) ranges from 10°≤β1≤17°; during the process of the extension device switching from the sitting position to the reclining position, the change angle δ2 of the angle β1 between the seat frame mounting surface of the base plate (21) and the lower surface of the support frame (10) ranges from 3°≤δ2≤14°.

8. The extension device according to claim 1, characterized in that, The extension assembly also includes a footstool assembly, which is movably connected to the base plate (21). The footstool assembly includes a footrest (50) for mounting a foot pad, an inner seat plate (51), an outer seat plate (52), a front seat plate (53), and a rear seat plate (54). The rear end of the outer seat plate (52) is hinged to the base plate (21), and the front end of the outer seat plate (52) is hinged to the rear end of the rear seat plate (54). The rear end of the inner seat plate (51) is hinged to the base plate (21), and the front end of the inner seat plate (51) is hinged to the rear end of the front seat plate (53). The middle part of the outer seat plate (52) is hinged to the middle part of the front seat plate (53). The front ends of the front seat plate (53) and the front ends of the rear seat plate (54) are both connected to the footrest (50). When the extension device is in the sitting position, the footrest (50) retracts below the seat frame. When the extension device is in the leisure state, the footrest (50) extends to the front of the seat frame, and the angle θ3 between the upper surface of the footrest (50) and the lower surface of the support frame (10) is in the range of 2°≤θ3≤10°; when the extension device is in the reclining state, the angle θ3 between the upper surface of the footrest (50) and the lower surface of the support frame (10) is in the range of 6°≤θ3≤14°.

9. The extension device according to claim 8, characterized in that, The footrest (50) is one piece. When the extension device is in the lying position, the maximum height d6 of the highest point of the footrest (50) relative to the lower surface of the support frame (10) is in the range of 560mm≤d6≤600mm. When the extension device is in the leisure position, the maximum height d6 of the highest point of the footrest (50) relative to the lower surface of the support frame (10) is in the range of 450mm≤d6≤500mm.

10. The extension device according to claim 8, characterized in that, There are two footrests (50), one of which is a rear footrest (56) and the other is a front footrest (55). The front end of the front footrest board (53) is hinged to the rear footrest (56), and the front end of the rear footrest board (54) is hinged to the front footrest (55). The height of the highest point of the rear footrest (56) relative to the lower surface of the supporting iron frame (10) is greater than the height of the highest point of the backrest mounting plate (41) relative to the lower surface of the supporting iron frame (10). When the extension device is in the reclining position, the footrest (50) extends to the front of the seat frame, and the maximum height d6 of the highest point of the footrest (50) relative to the lower surface of the support frame (10) is in the range of 580mm≤d6≤630mm; when the extension device is in the leisure position, the maximum height d6 of the highest point of the footrest (50) relative to the lower surface of the support frame (10) is in the range of 470mm≤d6≤520mm.

11. The extension device according to claim 1, characterized in that, The linkage assembly includes a first linkage plate (221), a second linkage plate (222), a third linkage plate, a fourth linkage plate (224), and a fifth linkage plate (225). The lower end of the first linkage plate (221) is hinged to the supporting iron frame (10), the upper end of the first linkage plate (221) is hinged to the front end of the second linkage plate (222), the rear end of the second linkage plate (222) is hinged to the base plate (21), and the front end of the third linkage plate is hinged to the second linkage plate. The middle part of (222) is hinged together, the rear end of the third linkage plate is hinged together with the front end of the fourth linkage plate (224), the lower end of the fourth linkage plate (224) is hinged together with the lower end of the base plate (21), the rear end of the fourth linkage plate (224) is hinged together with the first backrest connecting rod (43), the upper end of the fourth linkage plate (224) is hinged together with the upper end of the fifth linkage plate (225), and the lower end of the fifth linkage plate (225) is hinged together with the support iron frame (10).

12. A sofa, characterized in that, It includes a seat frame, a footrest, a backrest, and an extension device as described in any one of claims 1 to 11.

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