Stretching device and sofa

Abstract

The invention provides a stretching device and a sofa. The stretching device can be arranged in a reciprocating and switchable manner among a sitting posture state, a leisure state and a lying posture state; when the stretching device is in the sitting posture state, the foot rest piece is retracted below the seat frame, and the minimum distance between the highest point of the backrest cushion and a preset vertical plane is equal to zero; when the stretching device is in a leisure state, the foot rest piece stretches to the front of the seat frame and inclines relative to the horizontal direction, and the distance between the highest point of the backrest cushion and a preset vertical plane is larger than zero; when the stretching device is in the lying posture state, the minimum distance between the highest point of the backrest cushion and the preset vertical plane is equal to zero, and the height of the highest point of the foot rest piece relative to the horizontal installation base plane is larger than that of the highest point of the backrest piece relative to the horizontal installation base plane. The invention solves the problem that the iron stand floor sofa in the prior art cannot meet the requirements of customers on zero wall-leaning arrangement and zero-gravity comfortable experience of the sofa at the same time.

Description

Technical Field

[0001] This invention 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), which is divided into sections for upholstered components such as backrests, seat frames, and footrests. The functional 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 movable 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, the common iron-framed floor sofas cannot simultaneously meet customers' requirements for a sofa that is placed without being against a wall and for a zero-gravity comfort experience. Summary of the Invention

[0005] The main objective of this invention is to provide an extension device and a sofa to solve the problem that existing iron-framed floor sofas cannot simultaneously meet customers' requirements for a sofa with zero wall support and a zero-gravity comfort experience.

[0006] To achieve the above objectives, according to one aspect of the present invention, an extension device is provided, comprising: a support frame and two extension components, the support frame being disposed on a horizontal mounting base, and the two extension components being disposed on opposite sides of the support frame; each extension component includes: a base plate, a foot support component, and a back support component, the base plate being used to connect to the seat frame of a sofa, the base plate being movably disposed on the support frame, the foot support component and the back support component being movably connected to the base plate, the foot support component including a footrest, and the back support component including a backrest component, the backrest component being used to connect to the backrest cushion of the sofa; the extension device has a sitting posture, a relaxing posture, and a reclining posture, and the base plate of each extension component can be movably disposed so that the extension device is in a sitting posture... The device can be switched between a seated position, a relaxed position, and a reclining position. When the extension device is in a seated position, the footrest is retracted below the seat frame, and the minimum distance between the highest point of the backrest and the preset vertical plane is zero. When the extension device is in a relaxed position, the footrest extends to the front of the seat frame and tilts relative to the horizontal direction, and the distance between the highest point of the backrest and the preset vertical plane is greater than zero. When the extension device is in a reclining position, compared to the relaxed position, the highest point of the backrest is lowered, and the minimum distance between the highest point of the backrest and the preset vertical plane is zero. The height of the highest point of the foot support component relative to the horizontal mounting base is greater than the height of the highest point of the back support component relative to the horizontal mounting base.

[0007] Furthermore, when the extension device is in a reclining position, the angle θ1 between the upper surface of the footrest and the horizontal mounting base is in the range of 10°≤θ1≤12°; when the extension device is in a leisure position, the angle θ1 between the upper surface of the footrest and the horizontal mounting base is in the range of 6°≤θ1≤7°.

[0008] Furthermore, there are two footrests, one of which is the first footrest and the other is the second footrest. The highest point of the second footrest is higher than the highest point of the first footrest. The height of the highest point of the first footrest relative to the horizontal mounting base is greater than the height of the highest point of the backrest relative to the horizontal mounting base. The angle θ1 between the upper surface of the second footrest and the horizontal mounting base ranges from 10° to 12°. When the extension device is in a relaxed state, the angle θ1 between the upper surface of the second footrest and the horizontal mounting base ranges from 6° to 7°.

[0009] Furthermore, when the extension device is in a reclining position, the range of the included angle β1 between the backrest and the horizontal mounting base is: 15°≤β1≤30°; during the process of the extension device switching from a sitting position to a reclining position, the range of the change angle δ1 between the included angle β1 between the backrest and the horizontal mounting base is: 25°≤δ1≤50°; where δ1=β1sitting position-β1reclining position.

[0010] Furthermore, when the extension device is in a reclining position, the angle β2 between the preset axis on the substrate and the horizontal mounting base is in the range of 13°≤β2≤19°; when the extension device is in a sitting position, the angle β2 between the preset axis on the substrate and the horizontal mounting base is in the range of 6°≤β2≤10°; when the extension device is in a leisure position, the angle β2 between the preset axis on the substrate and the horizontal mounting base is in the range of 10°≤β2≤13°; and during the process of the extension device switching from a sitting position to a reclining position, the change angle δ2 of the angle β2 between the preset axis on the substrate and the horizontal mounting base is in the range of 3°≤δ2≤13°.

[0011] Furthermore, the foot support component includes a first foot support and a second foot support. One end of the first foot support and one end of the second foot support are both hinged to the base plate. The other end of the first foot support is hinged to a first footrest, and the other end of the second foot support is hinged to the second footrest. When the extension device is in a lying position and a leisure position, the maximum distance d4 between the first footrest and the second footrest ranges from 200mm ≤ d4 ≤ 220mm. When the extension device is in a lying position, the height d5 of the highest point of the first footrest relative to the horizontal mounting base ranges from 560mm ≤ d5 ≤ 580mm. When the extension device is in a leisure position, the height d5 of the highest point of the first footrest relative to the horizontal mounting base ranges from 450mm ≤ d5 ≤ 470mm.

[0012] Furthermore, the extension device also includes a drive member, and each extension component also includes a drive rod. The drive rod is movably mounted on the base plate, and the drive rod and the foot support component are connected by transmission. The drive member and the drive rod are driven to move the drive rod, so that the drive rod drives the base plate to move, allowing the extension device to switch back and forth between a sitting position, a leisure position, and a reclining position. Specifically, before the base plate moves forward a first preset distance d1, the drive rod is rotatably arranged around its axis and movable in the horizontal direction, so that the drive rod drives the footrest component to move, allowing the extension device to switch from a sitting position to a leisure position. Before the base plate continues to move forward a second preset distance d2, the drive rod is movable in the horizontal direction, so that the base plate and the backrest component move, allowing the extension device to switch from a leisure position to a reclining position.

[0013] Furthermore, each extension component also includes a connecting member, which is movably mounted on the support frame. The connecting member has a first connecting end, a second connecting end, and a third connecting end. The back support component includes a first backrest rod, a second backrest rod, and a third backrest rod. The two ends of the third backrest rod are respectively hinged to the first backrest rod and the second backrest rod. One end of the first backrest rod is hinged to the base plate, and the other end of the first backrest rod is hinged to the backrest member. One end of the second backrest rod is hinged to the third connecting end, and the other end of the second backrest rod is hinged to the backrest member, so that the base plate drives the backrest member to move in a direction toward the support frame via the first backrest rod, and so that the base plate drives the backrest member to move in a direction toward the support frame via the connecting member and the second backrest rod.

[0014] Furthermore, the backrest component includes a first connecting plate segment, a second connecting plate segment, and a third connecting plate segment. The first ends of the first connecting plate segment, the first ends of the second connecting plate segment, and the first ends of the third connecting plate segment are connected to each other. The second connecting plate segment and the third connecting plate segment are respectively disposed on opposite sides of the first connecting plate segment. The second end of the second connecting plate segment is hinged to the first backrest rod, and the second end of the third connecting plate segment is hinged to the second backrest rod. And / or, when the extension device is in a reclining position, the included angle between the side of the second connecting plate segment away from the first connecting plate segment and the side of the first backrest rod close to the first connecting plate segment is α1, and the value range of α1 is 80°≤α1≤88°.

[0015] Furthermore, each extension component also includes a reinforcing component, which includes a reinforcing member, a first reinforcing rod, and a second reinforcing rod. The two ends of the first reinforcing rod are respectively hinged to the first ends of the supporting iron frame and the second reinforcing rod. The middle part of the second reinforcing rod is hinged to the connecting component. The second end of the second reinforcing rod is provided with a reinforcing member. When the extension device is in a lying position, the reinforcing member is used to abut against the horizontal mounting base.

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

[0017] Applying the technical solution of this invention, when the extension device is in a sitting position, the footrest is retracted below the seat frame, and the highest point of the backrest cushion contacts a preset vertical plane. When the extension device is in a relaxed position, relative to the sitting position, the distance between the footrest and the seat frame increases in both the horizontal and vertical directions, causing the footrest to extend to the front of the seat frame and tilt relative to the horizontal direction, and the distance between the highest point of the backrest cushion and the preset vertical plane is greater than zero. When the extension device is in a reclining position, relative to the relaxed position, and with the minimum distance between the highest point of the backrest cushion and the preset vertical plane equal to zero, the height of the highest point of the foot support component relative to the horizontal mounting base is greater than the height of the highest point of the back support component relative to the horizontal mounting base. Therefore, the user's legs can be roughly level with or slightly higher than the heart, achieving a zero-gravity effect. Furthermore, since the minimum distance between the highest point of the backrest and the preset vertical plane is zero when the extension device is in a sitting or lying position, the user does not need to leave any installation gap when installing the sofa. Also, because the backrest does not interfere with the preset vertical plane when the extension device switches between sitting, relaxed, and lying positions, the application allows for a zero-wall-adhesion sofa arrangement. This solves the problem that existing iron-framed floor sofas cannot simultaneously meet customers' requirements for both zero-wall-adhesion and zero-gravity comfort, allowing the sofa to have the advantages of both zero-wall-adhesion and zero-gravity, making placement more convenient and use more comfortable. Attached Figure Description

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

[0019] Figure 1 A schematic diagram of an embodiment of the extension device (with reinforcing components removed) according to the present invention is shown;

[0020] Figure 2 A schematic diagram of an embodiment of the extension device according to the present invention (excluding the driving member, driving rod, slider, guide rail, first transmission rod, second transmission rod and part of the support frame) is shown.

[0021] Figure 3 A schematic diagram of an embodiment of the extension device (with reinforcing components removed) in a seated position according to the present invention and a predetermined vertical plane is shown.

[0022] Figure 4 A schematic diagram of an embodiment of the extension device (with reinforcing components removed) in a relaxed state according to the present invention and a predetermined vertical plane is shown;

[0023] Figure 5A schematic diagram of an embodiment of the extension device (with reinforcing components removed) in a lying position according to the present invention and a predetermined vertical plane is shown;

[0024] Figure 6 A schematic diagram is shown showing the movement distance of the drive rod when the extension device according to the present invention switches between a sitting position, a leisure position and a lying position.

[0025] The above figures include the following reference numerals:

[0026] 10. Support frame; 20. Extension assembly; 21. Base plate; 22. Foot support component; 221. Foot rest; 2211. First foot rest; 2212. Second foot rest; 222. First foot support component; 223. Second foot support component; 23. Back support component; 231. Backrest component; 232. Backrest cushion; 30. Driving component; 31. Driving rod; 32. Slider; 33. Guide rail; 34. First transmission rod; 35. Second transmission rod; 40. Connecting components; 51. First backrest rod; 52. Second backrest rod; 52. Third backrest rod; 53. First connecting plate segment; 54. Second connecting plate segment; 55. Third connecting plate segment; 56. First connecting end; 57. Second connecting end; 58. Third connecting end; 61. Reinforcing component; 62. First reinforcing rod; 63. Second reinforcing rod; 41. First connecting rod; 42. Second connecting rod; 43. Third connecting rod; 44. Fourth connecting plate; 45. Fifth connecting rod. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Please refer to Figures 1 to 6This invention provides an extension device, comprising: a supporting frame 10 and two extension components 20. The supporting frame 10 is disposed on a horizontal mounting base, and the two extension components 20 are respectively disposed on opposite sides of the supporting frame 10. Each extension component 20 includes: a base plate 21, a foot support component 22, and a back support component 23. The base plate 21 is used to connect to the seat frame of a sofa and is movably disposed on the supporting frame 10. The foot support component 22 and the back support component 23 are both movably connected to the base plate 21. The foot support component 22 includes a footrest 221, and the back support component 23 includes a backrest 231, which is used to connect to the backrest cushion 232 of the sofa. The extension device has a sitting position, a relaxing position, and a reclining position. The base plate 21 of each extension component 20 can be movably disposed to allow the extension device to... The device can be switched between sitting, relaxing, and reclining positions. When the extension device is in the sitting position, the footrest 221 is retracted below the seat frame, and the minimum distance between the highest point of the backrest cushion 232 and the preset vertical plane is zero. When the extension device is in the relaxing position, the footrest 221 extends to the front of the seat frame and tilts relative to the horizontal direction, and the distance between the highest point of the backrest cushion 232 and the preset vertical plane is greater than zero. When the extension device is in the reclining position, the backrest cushion is tilted back, the highest point of the backrest cushion 232 is lowered, and the minimum distance between the highest point of the backrest cushion 232 and the preset vertical plane is zero. The height of the highest point of the foot support component 22 relative to the horizontal mounting base is greater than the height of the highest point of the back support component 23 relative to the horizontal mounting base.

[0031] When the extension device of the present invention is in a seated position, the footrest 221 retracts below the seat frame, and the highest point of the backrest cushion 232 contacts a preset vertical plane. When the extension device is in a relaxed position, the distance between the footrest 221 and the seat frame in both the horizontal and vertical directions increases relative to the seated position, so that the footrest 221 extends to the front of the seat frame and tilts relative to the horizontal direction, and the distance between the highest point of the backrest cushion 232 and the preset vertical plane is greater than zero. When the extension device is in a reclining position, the minimum distance between the highest point of the backrest cushion 232 and the preset vertical plane is equal to zero relative to the relaxed position, and the height of the highest point of the foot support member 22 relative to the horizontal mounting base is greater than the height of the highest point of the back support member 23 relative to the horizontal mounting base. The height of the base surface ensures that the user's legs are roughly level with or slightly higher than their heart, achieving a zero-gravity effect. Furthermore, since the minimum distance between the highest point of the backrest cushion 232 and the preset vertical plane is zero when the extension device is in a sitting or reclining position, the user does not need to leave any installation gap when installing the sofa. Also, because the backrest cushion 232 does not interfere with the preset vertical plane when the extension device switches between sitting, relaxed, and reclining positions, the application allows for a zero-wall-adhesion sofa arrangement. This solves the problem that existing iron-framed floor sofas cannot simultaneously meet customers' requirements for both zero-wall-adhesion and zero-gravity comfort, allowing the sofa to have the advantages of both zero-wall-adhesion and zero-gravity, making placement more convenient and use more comfortable.

[0032] Specifically, the preset vertical plane can be a vertical wall, the horizontal mounting base can be a horizontal ground, and the footrest 221 is used to connect the sofa's footrest, allowing the user's feet and legs to be placed on the footrest.

[0033] In this embodiment, as Figure 4 and Figure 5 As shown, when the extension device is in a lying position, the angle θ1 between the upper surface of the footrest 221 and the horizontal mounting base is in the range of 10°≤θ1≤12°; when the extension device is in a leisure position, the angle θ1 between the upper surface of the footrest 221 and the horizontal mounting base is in the range of 6°≤θ1≤7°.

[0034] In this embodiment, as Figure 4 and Figure 5As shown, there are two footrests 221. One of the two footrests 221 is the first footrest 2211, and the other footrest 221 is the second footrest 2212. The highest point of the second footrest 2212 is higher than the highest point of the first footrest 2211. The height of the highest point of the first footrest 2211 relative to the horizontal mounting base is greater than the height of the highest point of the backrest 231 relative to the horizontal mounting base. The angle θ1 between the upper surface of the second footrest 2212 and the horizontal mounting base ranges from 10°≤θ1≤12°. When the extension device is in the leisure state, the angle θ1 between the upper surface of the second footrest 2212 and the horizontal mounting base ranges from 6°≤θ1≤7°.

[0035] Specifically, the highest point of the first footrest 2211 is higher than the height of the highest point of the backrest 231 relative to the horizontal mounting base. This arrangement ensures that the user's legs are roughly level with or slightly higher than the heart, achieving a zero-gravity effect.

[0036] Preferably, when the extension device is in a reclining position, the angle θ1 between the upper surface of the second footrest 2212 and the horizontal mounting base is equal to 12°; when the extension device is in a relaxed position, the angle θ1 between the upper surface of the second footrest 2212 and the horizontal mounting base is equal to 7°. This setting makes the angle of the second footrest 2212 more gradual, and the position of the user's lower leg or foot is more gradual when using it, which can improve the user's comfort.

[0037] In this embodiment, as Figures 3 to 5 As shown, when the extension device is in a reclining position, the included angle β1 between the backrest 231 and the horizontal mounting base ranges from 15° to 30°; when the extension device is in a sitting position, the included angle β1 between the backrest 231 and the horizontal mounting base ranges from 55° to 65°; when the extension device is in a relaxing position, the included angle β1 between the backrest 231 and the horizontal mounting base ranges from 58° to 60°; during the process of the extension device switching from a sitting to a reclining position, the change angle δ1 of the included angle β1 between the backrest 231 and the horizontal mounting base ranges from 25° to 50°; where δ1 = β1 坐姿 -β1 躺姿 .

[0038] Preferably, when the extension device is in a reclining position, the included angle β1 between the backrest 231 and the horizontal mounting base is 24°; when the extension device is in a sitting position, the included angle β1 between the backrest 231 and the horizontal mounting base is 62°; and when the extension device is in a leisure position, the included angle β1 between the backrest 231 and the horizontal mounting base is 59°.

[0039] Specifically, this design ensures that the reclining angle of the backrest 231 is moderate and conforms well to the user's body structure, thereby improving the user's comfort.

[0040] In this embodiment, as Figures 3 to 5 As shown, when the extension device is in a reclining position, the angle β2 between the preset axis on the substrate 21 and the horizontal mounting base is in the range of 13°≤β2≤19°; when the extension device is in a sitting position, the angle β2 between the preset axis on the substrate 21 and the horizontal mounting base is in the range of 6°≤β2≤10°; when the extension device is in a leisure position, the angle β2 between the preset axis on the substrate 21 and the horizontal mounting base is in the range of 10°≤β2≤13°; during the process of the extension device switching from a sitting position to a reclining position, the change angle δ2 of the angle β2 between the preset axis on the substrate 21 and the horizontal mounting base is in the range of 3°≤δ2≤13°.

[0041] Specifically, when the extension device is in a lying position, the angle β2 between the preset axis on the substrate 21 and the horizontal mounting base is equal to 16°; when the extension device is in a sitting position, the angle β2 between the preset axis on the substrate 21 and the horizontal mounting base is equal to 8°; and when the extension device is in a leisure position, the angle β2 between the preset axis on the substrate 21 and the horizontal mounting base is equal to 12°.

[0042] Specifically, this design allows for a more relaxed seat angle, preventing the user's body from rising too much and thus improving user comfort.

[0043] In this embodiment, as Figure 5As shown, the foot support component 22 includes a first foot support 222 and a second foot support 223. One end of the first foot support 222 and one end of the second foot support 223 are both hinged to the base plate 21. The other end of the first foot support 222 is hinged to the first footrest 2211, and the other end of the second foot support 223 is hinged to the second footrest 2212. When the extension device is in a lying position and a leisure position, the maximum distance d4 between the first footrest 2211 and the second footrest 2212 ranges from 2. 00mm≤d4≤220mm; the height d6 of the highest point of the second footrest 2212 relative to the horizontal mounting base is 505mm and 623mm respectively; when the extension device is in the lying position, the height d5 of the highest point of the first footrest 2211 relative to the horizontal mounting base is 560mm≤d5≤580mm; when the extension device is in the leisure position, the height d5 of the highest point of the first footrest 2211 relative to the horizontal mounting base is 450mm≤d5≤470mm.

[0044] Specifically, the foot pad is fitted onto two foot rest pieces 221. By setting the maximum distance d4 between the first foot rest piece 2211 and the second foot rest piece 2212 to a range of 200mm≤d4≤220mm, the distance between the first foot rest piece 2211 and the second foot rest piece 2212 when unfolded is greater than the distance between the first foot rest piece 2211 and the second foot rest piece 2212 when folded. This increases the overall area of ​​the foot pad and meets the needs of users with longer legs.

[0045] Optionally, when the extension device is in a reclining position, the height d5 of the highest point of the first footrest 2211 relative to the horizontal mounting base is 578 mm, and the height d6 of the highest point of the second footrest 2212 relative to the horizontal mounting base is 623 mm; when the extension device is in the leisure position, the height d5 of the highest point of the first footrest 2211 relative to the horizontal mounting base is 461 mm, and the height d6 of the highest point of the second footrest 2212 relative to the horizontal mounting base is 505 mm.

[0046] In this embodiment, as Figure 6As shown, the extension device also includes a drive member 30, and each extension component 20 includes a drive rod 31. The drive rod 31 is movably mounted on the base plate 21. The drive rod 31 and the footrest 221 are connected in a transmission manner. The drive member 30 and the drive rod 31 are driven to move the drive rod 31, so that the drive rod 31 drives the base plate 21 to move, thereby allowing the extension device to switch back and forth between a sitting state, a leisure state, and a reclining state. Specifically, before the base plate 21 moves forward a first preset distance d1, the drive rod 31 is rotatably arranged around its axis and movable in the horizontal direction, so that the drive rod 31 drives the footrest 221 to move, thereby switching the extension device from a sitting state to a leisure state. Before the base plate 21 continues to move forward a second preset distance d2, the drive rod 31 is movable in the horizontal direction, so that the base plate 21 and the backrest 231 move, thereby switching the extension device from a leisure state to a reclining state.

[0047] Specifically, the driving member 30 drives the driving rod 31 to move, and the driving rod 31 drives the footrest 221 and the base plate 21 to move, so that the extension device can smoothly switch between a sitting state, a leisure state, and a reclining state. The driving member 30 drives the driving rod 31 to rotate around its axis and move in the horizontal direction, so that the driving rod 31 drives the footrest 221 to move. At the same time, the driving rod 31 drives the base plate 21 forward a first preset distance d1. At this time, the extension device switches from a sitting state to a leisure state. Then the driving rod 31 can no longer rotate. The driving rod 31 can only drive the base plate 21 to continue to move forward in the horizontal direction a second preset distance d2. At this time, the extension device switches from a leisure state to a reclining state.

[0048] Specifically, the cross-section of the drive rod 31 along the direction perpendicular to the axial direction of the drive rod 31 is rectangular or polygonal. For example... Figure 6 As shown in the figure, point A indicates the position of the drive rod 31 when the extension device is in a sitting position, point B indicates the position of the drive rod 31 when the extension device is in a leisure position, and point C indicates the position of the drive rod 31 when the extension device is in a lying position. The first preset distance d1 is 117.04 mm, and the second preset distance d2 is 155.82 mm.

[0049] In this embodiment, as Figure 1 As shown, the extension device also includes a slider 32 and a guide rail 33. The guide rail 33 is mounted on the support frame 10 and extends horizontally. The slider 32 is movably mounted on the guide rail 33. The driving member 30 and the slider 32 are drivenly connected, and the slider 32 and the driving rod 31 are connected in a transmission manner so that the slider 32 drives the driving rod 31 to move.

[0050] Specifically, such as Figure 1As shown, each extension component 20 also includes a first transmission rod 34 and a second transmission rod 35. One end of the first transmission rod 34 is connected to the slider 32, and the other end of the first transmission rod 34 is hinged to one end of the second transmission rod 35. The other end of the second transmission rod 35 is hinged to the drive rod 31 so that the drive rod 31 can be moved by the movement of the slider 32.

[0051] In this embodiment, as Figure 2 and Figure 3 As shown, each extension component 20 also includes a connecting component 40, which is movably mounted on the support frame 10. The connecting component 40 has a first connecting end 56, a second connecting end 57, and a third connecting end 58. The back support component 23 includes a first backrest rod 51, a second backrest rod 52, and a third backrest rod 521. The two ends of the third backrest rod 521 are respectively hinged to the first backrest rod 51 and the second backrest rod 52. One end of the first backrest rod 51 is hinged to the base plate 21, and the other end of the first backrest rod 51 is hinged to the backrest member 231. One end of the second backrest rod 52 is hinged to the third connecting end 58, and the other end of the second backrest rod 52 is hinged to the backrest member 231, so that the base plate 21 drives the backrest member 231 to move in a direction toward the support frame 10 via the first backrest rod 51, and so that the base plate 21 drives the backrest member 231 to move in a direction toward the support frame 10 via the connecting component 40 and the second backrest rod 52.

[0052] Specifically, the first backrest rod 51 is used to drive the base plate 21 and the backrest member 231, so that the base plate 21 can drive the backrest member 231 to move; the second backrest rod 52 is used to drive the backrest member 231 and the connecting component 40, so that the connecting component 40 can drive the backrest member 231 to move, thereby enabling the base plate 21 to drive the backrest member 231 to move; the first backrest rod 51 and the second backrest rod 52 together ensure the reliability of the transmission connection between the base plate 21 and the backrest member 231, ensuring that the extension device can smoothly switch from a leisure state to a reclining state.

[0053] In this embodiment, as Figure 1 and Figure 2As shown, the backrest component 231 includes a first connecting plate segment 53, a second connecting plate segment 54, and a third connecting plate segment 55. The first ends of the first connecting plate segment 53, the second connecting plate segment 54, and the third connecting plate segment 55 are connected to each other. The second connecting plate segment 54 and the third connecting plate segment 55 are respectively disposed on opposite sides of the first connecting plate segment 53. The second end of the second connecting plate segment 54 is hinged to the first backrest rod 51, and the second end of the third connecting plate segment 55 is hinged to the second backrest rod 52. And / or, when the extension device is in a reclining position, the included angle between the side of the second connecting plate segment 54 away from the first connecting plate segment 53 and the side of the first backrest rod 51 close to the first connecting plate segment 53 is α1, and the value range of α1 is 80°≤α1≤88°.

[0054] Specifically, the value range of α1 is 80°≤α1≤88°. This setting can avoid the backrest 231 needing to rotate a large angle to flip over smoothly, thereby avoiding the long time required for the extension device to switch from a leisure state to a reclining state. This helps to ensure the smooth operation of the extension device of this application and improve the user's comfort.

[0055] In this embodiment, as Figure 2 As shown, each extension component 20 also includes a reinforcing component, which includes a reinforcing member 61, a first reinforcing rod 62 and a second reinforcing rod 63. The two ends of the first reinforcing rod 62 are respectively hinged to the first ends of the supporting iron frame 10 and the second reinforcing rod 63. The middle part of the second reinforcing rod 63 is hinged to the connecting component 40. The second end of the second reinforcing rod 63 is provided with a reinforcing member 61. When the extension device is in a lying position, the reinforcing member 61 is used to abut against the horizontal mounting base.

[0056] Specifically, such as Figure 2 As shown, the connecting component 40 includes a first connecting rod 41, a second connecting rod 42, a third connecting rod 43, a fourth connecting plate 44, and a fifth connecting rod 45. The fourth connecting plate 44 has an irregular structure and four different connecting ends. One end of the first connecting rod 41 is hinged to the supporting iron frame 10, and the other end of the first connecting rod 41 is hinged to one end of the second connecting rod 42, with the other end of the second connecting rod 42 forming a first connecting end 56. One end of the third connecting rod 43 is hinged to the middle of the second connecting rod 42, and the other end of the third connecting rod 43 is hinged to one connecting end of the fourth connecting plate 44. The two connecting ends of the fourth connecting plate 44 respectively form a second connecting end 57 and a third connecting end 58. One connecting end of the fourth connecting plate 44 is hinged to one end of the fifth connecting rod 45, and the other end of the fifth connecting rod 45 is hinged to the supporting iron frame 10.

[0057] Specifically, the base plate 21 drives the connecting component 40 to move, and the connecting component 40 drives the second reinforcing rod 63 and the first reinforcing rod 62 to move and unfold. This causes the reinforcing component 61 to move away from the preset vertical plane until it abuts against the horizontal mounting base to support the extension device of this application. This effectively increases the support range of the support frame 10, reducing the risk of forward tilting caused by the forward shift of gravity of the extension device in a reclining position, and helping to prevent the extension device from tipping over. When the extension device is in a sitting position, the first reinforcing rod 62 and the second reinforcing rod 63 are retracted under the seat frame, and the reinforcing component 61 is also retracted under the seat frame, preventing the reinforcing component 61, the first reinforcing rod 62, and the second reinforcing rod 63 from being exposed, thus ensuring the aesthetics of the sofa.

[0058] Specifically, the middle part of the second reinforcing rod 63 is hinged to the middle part of the first connecting rod 41; the reinforcing part 61 is a support wheel.

[0059] The present invention also provides a sofa, including a seat frame, a footrest, a backrest cushion 232, and the aforementioned extension device.

[0060] In specific implementation, when the extension device is in a seated position, the angle θ2 between the backrest 231 and the preset axis on the base plate 21 is 109°, and the distance h1 between the highest point of the backrest cushion 232 and the horizontal mounting base is 915mm; when the extension device is in a relaxed position, the angle θ2 between the backrest 231 and the preset axis on the base plate 21 is 109°, the lifting height d6 between the highest point of the second footrest 2212 and the horizontal mounting base is 505mm, and the distance h1 between the highest point of the second footrest 2212 and the base plate 21 is 915mm. The minimum horizontal distance d7 between the plate 21 and the substrate 21 is 504 mm. When the extension device is in a reclining position, the angle θ2 between the backrest 231 and the preset axis on the substrate 21 is 140°. The lifting height d6 between the highest point of the second footrest 2212 and the horizontal mounting base is 623 mm. The distance h1 between the highest point of the backrest cushion 232 and the horizontal mounting base is 624 mm. The minimum horizontal distance d7 between the highest point of the second footrest 2212 and the substrate 21 is 485 mm.

[0061] Specifically, by limiting the range of the angle between the backrest 231 and the preset axis on the base plate 21, the proximity of the user's back and legs can be limited, preventing the user's back and legs from being too close, which would cause the user's body to bend excessively and affect the user experience. At the same time, it can also prevent the user's leg elevation angle from being too small, which would affect the user's zero-gravity experience. By limiting the elevation height between the highest point of the second footrest 2212 and the horizontal mounting base, it can be ensured that the user's legs are only slightly higher than the heart, satisfying the user's zero-gravity experience while avoiding discomfort caused by the legs being inverted. By limiting the distance between the highest point of the backrest cushion 232 and the horizontal mounting base, it can be prevented that the user's heart height is too high or too low, thus ensuring that the user's legs are only slightly higher than the heart, thereby ensuring the user's comfort.

[0062] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0063] The sofa of this invention combines the three elements of a ground-mounted iron frame, zero gravity, and zero wall contact, allowing the sofa to simultaneously possess the advantages of zero wall contact and zero gravity, making it more convenient to place and more comfortable to use; the extension device of this application has a simple structure and lower production cost; the extension device of this application operates smoothly.

[0064] When the extension device of the present invention is in a seated position, the footrest 221 retracts below the seat frame, and the highest point of the backrest cushion 232 contacts a preset vertical plane. When the extension device is in a relaxed position, the distance between the footrest 221 and the seat frame in both the horizontal and vertical directions increases relative to the seated position, so that the footrest 221 extends to the front of the seat frame and tilts relative to the horizontal direction, and the distance between the highest point of the backrest cushion 232 and the preset vertical plane is greater than zero. When the extension device is in a reclining position, the minimum distance between the highest point of the backrest cushion 232 and the preset vertical plane is equal to zero relative to the relaxed position, and the height of the highest point of the foot support member 22 relative to the horizontal mounting base is greater than the height of the highest point of the back support member 23 relative to the horizontal mounting base. The height of the base surface ensures that the user's legs are roughly level with or slightly higher than their heart, achieving a zero-gravity effect. Furthermore, since the minimum distance between the highest point of the backrest cushion 232 and the preset vertical plane is zero when the extension device is in a sitting or reclining position, the user does not need to leave any installation gap when installing the sofa. Also, because the backrest cushion 232 does not interfere with the preset vertical plane when the extension device switches between sitting, relaxed, and reclining positions, the application allows for a zero-wall-adhesion sofa arrangement. This solves the problem that existing iron-framed floor sofas cannot simultaneously meet customers' requirements for both zero-wall-adhesion and zero-gravity comfort, allowing the sofa to have the advantages of both zero-wall-adhesion and zero-gravity, making placement more convenient and use more comfortable.

[0065] 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.

[0066] 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.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stretching device, characterized by The utility model relates to a sofa stretching device, which comprises a support frame (10) and two stretching assemblies (20), the support frame (10) is arranged on a horizontal installation base surface, and the two stretching assemblies (20) are arranged on opposite sides of the support frame (10) respectively. Each stretching assembly (20) comprises a base plate (21) for connecting a seat frame of a sofa, a foot support component (22) and a back support component (23), the base plate (21) is movably arranged on the support frame (10), the foot support component (22) and the back support component (23) are movably connected with the base plate (21), the foot support component (22) comprises a foot rest (221), and the back support component (23) comprises a back rest (231) for connecting a back cushion (232) of the sofa. The stretching device has a sitting state, a leisure state and a lying state, and the base plate (21) of each stretching assembly (20) is movably arranged to enable the stretching device to be reciprocally and switchably arranged between the sitting state, the leisure state and the lying state. When the stretching device is in the sitting state, the foot rest (221) is retracted below the seat frame, the minimum distance between the highest point of the back cushion (232) and a preset vertical plane is equal to zero; when the stretching device is in the leisure state, the foot rest (221) is extended to the front of the seat frame and is inclined relative to the horizontal direction, the distance between the highest point of the back cushion (232) and the preset vertical plane is greater than zero; when the stretching device is in the lying state, the highest point of the back cushion (232) is lowered relative to the case where the stretching device is in the leisure state, and the minimum distance between the highest point of the back cushion (232) and the preset vertical plane is equal to zero. The height of the highest point of the foot support component (22) relative to the horizontal installation base surface is greater than the height of the highest point of the back support component (23) relative to the horizontal installation base surface. When the stretching device is in the lying state, the included angle θ1 between the upper surface of the foot rest (221) and the horizontal installation base surface is in the range of 10°≤θ1≤12°; when the stretching device is in the leisure state, the included angle θ1 between the upper surface of the foot rest (221) and the horizontal installation base surface is in the range of 6°≤θ1≤7°.

2. The stretching apparatus of claim 1, wherein ​ 3. The stretching apparatus of claim 2, wherein The foot rest pieces (221) are two, one of the two foot rest pieces (221) is a first foot rest piece (2211), the other of the two foot rest pieces (221) is a second foot rest piece (2212), the highest point of the second foot rest piece (2212) is higher than that of the first foot rest piece (2211), the height of the highest point of the first foot rest piece (2211) relative to the horizontal installation base is greater than that of the highest point of the back rest piece (231) relative to the horizontal installation base; the included angle θ1 between the upper surface of the second foot rest piece (2212) and the horizontal installation base ranges from 10° to 12°; when the stretching device is in the leisure state, the included angle θ1 between the upper surface of the second foot rest piece (2212) and the horizontal installation base ranges from 6° to 7°.

4. The stretching apparatus of claim 1, wherein An included angle β1 between the backrest piece (231) and the horizontal installation base surface ranges from 15° to 30° when the stretching device is in the lying state; a variation angle δ1 of the included angle β1 between the backrest piece (231) and the horizontal installation base surface ranges from 25° to 50° during the process that the stretching device switches from the sitting state to the lying state; wherein δ1 = β1 坐姿 -β1 躺姿 .

5. The stretching apparatus of claim 1 wherein, When the stretching device is in the lying state, the included angle β2 between the preset axis on the base plate (21) and the horizontal installation base ranges from 13° to 19°; when the stretching device is in the sitting state, the included angle β2 between the preset axis on the base plate (21) and the horizontal installation base ranges from 6° to 10°; when the stretching device is in the leisure state, the included angle β2 between the preset axis on the base plate (21) and the horizontal installation base ranges from 10° to 13°; during the switching of the stretching device from the sitting state to the lying state, the change angle δ2 of the included angle β2 between the preset axis on the base plate (21) and the horizontal installation base ranges from 3° to 13°.

6. The stretching apparatus of claim 3 wherein, The foot support component (22) comprises a first foot support piece (222) and a second foot support piece (223), one end of the first foot support piece (222) and one end of the second foot support piece (223) are hinged to the base plate (21), the other end of the first foot support piece (222) is hinged to the first foot rest piece (2211), and the other end of the second foot support piece (223) is hinged to the second foot rest piece (2212); wherein, when the stretching device is in the lying state and the leisure state respectively, the maximum distance d4 between the first foot rest piece (2211) and the second foot rest piece (2212) ranges from 200mm to 220mm; when the stretching device is in the lying state, the height d5 of the highest point of the first foot rest piece (2211) relative to the horizontal installation base ranges from 560mm to 580mm; when the stretching device is in the leisure state, the height d5 of the highest point of the first foot rest piece (2211) relative to the horizontal installation base ranges from 450mm to 470mm.

7. The stretching apparatus of claim 1 wherein, The stretching device further comprises a driving member (30), each of the stretching assemblies (20) further comprises a driving rod (31) movably penetrating the base plate (21), the driving rod (31) is in transmission connection with the foot supporting part (22), the driving member (30) is in driving connection with the driving rod (31) to drive the movement of the driving rod (31) to drive the base plate (21) to move, so as to switch the stretching device between the sitting state, the leisure state and the lying state; wherein, before the base plate (21) moves forward by a first preset distance d1, the driving rod (31) is rotatably arranged around its axis and movably arranged along the horizontal direction, so as to drive the movement of the foot rest (221) to switch the stretching device from the sitting state to the leisure state; before the base plate (21) continues to move forward by a second preset distance d2, the driving rod (31) is movably arranged along the horizontal direction to drive the movement of the base plate (21) and the back rest (231) to switch the stretching device from the leisure state to the lying state.

8. The stretching apparatus of claim 1 wherein, Each of the stretching assemblies (20) further comprises a connecting part (40) movably arranged on the supporting iron stand (10), the connecting part (40) has a first connecting end (56), a second connecting end (57) and a third connecting end (58); the back supporting part (23) comprises a first back rest rod (51), a second back rest rod (52) and a third back rest rod (521), both ends of the third back rest rod (521) are hingedly connected with the first back rest rod (51) and the second back rest rod (52) respectively; one end of the first back rest rod (51) is hingedly connected with the base plate (21), the other end of the first back rest rod (51) is hingedly connected with the back rest (231), one end of the second back rest rod (52) is hingedly connected with the third connecting end (58), the other end of the second back rest rod (52) is hingedly connected with the back rest (231), so that the base plate (21) drives the movement of the back rest (231) along the direction of approaching the supporting iron stand (10) through the first back rest rod (51), and the base plate (21) drives the movement of the back rest (231) along the direction of approaching the supporting iron stand (10) through the connecting part (40) and the second back rest rod (52).

9. The stretching apparatus of claim 8, wherein, The backrest piece (231) comprises a first connecting plate segment (53), a second connecting plate segment (54) and a third connecting plate segment (55), a first end of the first connecting plate segment (53), a first end of the second connecting plate segment (54) and a first end of the third connecting plate segment (55) are connected to each other, the second connecting plate segment (54) and the third connecting plate segment (55) are respectively arranged on opposite sides of the first connecting plate segment (53), a second end of the second connecting plate segment (54) is hinged to the first backrest rod (51), and a second end of the third connecting plate segment (55) is hinged to the second backrest rod (52); and / or When the stretching device is in the lying state, an included angle between an edge of the second connecting plate segment (54) away from the first connecting plate segment (53) and an edge of the first backrest rod (51) close to the first connecting plate segment (53) is α1, and α1 is in a range of 80°≤α1≤88°.

10. The stretching apparatus of claim 8, wherein, Each of the stretching assemblies (20) further comprises a reinforcing component, the reinforcing component comprises a reinforcing piece (61), a first reinforcing rod (62) and a second reinforcing rod (63), two ends of the first reinforcing rod (62) are respectively connected to the support iron stand (10) and a first end of the second reinforcing rod (63), a middle part of the second reinforcing rod (63) is hinged to the connecting component (40), a second end of the second reinforcing rod (63) is provided with the reinforcing piece (61), and the reinforcing piece (61) is used for abutting against the horizontal installation base surface when the stretching device is in the lying state.

11. A sofa, characterized in that The stretching device comprises a seat frame, a foot pad, a backrest pad (232) and any one of the stretching devices according to claims 1 to 10.

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