Zero-gravity sofa structure

Abstract

A zero-gravity sofa structure. The zero-gravity sofa structure comprises a base (1), a seat frame (2) slidably arranged on the base (1), legs (4) connected to the seat frame (2), linkage assemblies (6) connected to the base (1) and configured to link the seat frame (2) with the legs (4), and a driving member (5) configured to drive the seat frame (2) to move relative to the base (1) and / or drive the legs (4) to move relative to the seat frame (2). The movement process of the seat frame (2) includes a first stage and a second stage, wherein a driving force for driving the legs (4) to move relative to the seat frame (2) in the first stage is less than that in the second stage; and a driving force for driving the seat frame (2) to move relative to the base (1) in the first stage is greater than that in the second stage.

Description

Zero-gravity sofa structure TECHNICAL FIELD

[0001] The present application relates to the technical field of sofas, in particular to a zero-gravity sofa structure. BACKGROUND

[0002] The zero-gravity sofa is a kind of sofa, when a person lies on the sofa, the knees and heart of the human body can be on the same horizontal line, so that each part of the human body is in the most relaxed state, and the muscle fatigue is reduced.

[0003] Referring to the existing patent application file with application number 202322358339.6 or 202010750528.6, in the late stage of the movement of the sofa in the process of changing into a zero-gravity lying position, the driving part needs to output a larger force to overcome the gravity of the seat frame to drive the front end of the seat frame to be raised. This results in a large load on the driving part in the late stage of the movement, which requires a higher driving part and increases the production cost of the enterprise.

[0004] SUMMARY

[0005] In order to reasonably allocate the power output of the driving part in the whole movement process and improve the problem of excessive load on the driving part in the late stage of the movement, the present application provides a zero-gravity sofa structure.

[0006] In one aspect, the present application provides a zero-gravity sofa structure, which adopts the following technical scheme:

[0007] A zero-gravity sofa structure, comprising a base, a seat frame slidingly arranged on the base, a leg support connected to the seat frame, a linkage assembly connected to the base and used to realize linkage of the seat frame and the leg support, and a driving part used to drive the seat frame to move relative to the base and / or drive the leg support to move relative to the seat frame;

[0008] Wherein, the movement process of the seat frame comprises a first stage and a second stage, the driving force for driving the leg support to move relative to the seat frame in the first stage is smaller than the driving force for driving the leg support to move relative to the seat frame in the second stage; the driving force for driving the seat frame to move relative to the base in the first stage is greater than the driving force for driving the seat frame to move relative to the base in the second stage.

[0009] By adopting the technical scheme, taking the process of converting into zero-gravity state as an example, in the early stage when the leg support needs less power, that is, the first stage, more power of the driving member is supplied to the forward movement of the seat frame and the upward tilting of the front end of the seat frame compared with the rear end; and in the later stage when the leg support needs more power, that is, the first stage, less power of the driving member is supplied to the forward movement of the seat frame and the upward tilting of the front end of the seat frame compared with the rear end; so that the power output of the driving member is reasonably configured in the whole movement process, and the problem of excessive load of the driving member in the later movement stage is improved.

[0010] Optionally, the base is provided with a track, the seat frame is provided with a moving piece, the moving piece is connected to the track and can move along the track; a slope of a line connecting two ends of the moving piece in the first stage is greater than a slope of a line connecting two ends of the moving piece in the second stage.

[0011] Optionally, the track comprises a first track and a second track, the moving piece is provided with two groups, and the two groups of moving pieces are respectively connected to the first track and the second track; a front side of the zero-gravity sofa structure is defined as a front, the first track is located in front of the second track, and the first track comprises a first part and a second part located in front of and above the first part.

[0012] In the first stage, the moving piece on the first track is located in the first part, and in the second stage, the moving piece on the first track is located in the second part.

[0013] Optionally, the first track is arranged in an arc shape.

[0014] Optionally, the track comprises a first track and a second track, the moving piece is provided with two groups, and the two groups of moving pieces are respectively connected to the first track and the second track; a front side of the zero-gravity sofa structure is defined as a front, the first track is located in front of the second track, and the first track comprises a first part and a second part located in front of and below the first part.

[0015] In the first stage, the moving piece on the first track is located in the first part, and in the second stage, the moving piece on the first track is located in the second part.

[0016] Optionally, the first track is arranged in an arc shape.

[0017] Optionally, the leg support comprises at least one main connecting piece, the main connecting piece is rotationally connected to the seat frame, a vertical plane containing a rotation point of the main connecting piece relative to the seat frame is defined as a first reference plane; a rotation angle of the main connecting piece relative to the first reference plane in the first stage is smaller than a rotation angle of the main connecting piece relative to the first reference plane in the second stage.

[0018] Optionally, the leg support comprises at least one main connecting member, the main connecting member is rotatably connected to the seat frame;

[0019] The driving member is connected to the main connecting member, the main connecting member is subjected to a force F1 from the driving member, an angle a between a momentary rotation direction of the main connecting member relative to a force point of the main connecting member and a direction of the force F1 is greater in the first stage than in the second stage; or the linkage assembly comprises a third connecting member, the third connecting member is connected to the main connecting member, the main connecting member is subjected to a force F2 from the third connecting member, an angle b between a momentary rotation direction of the main connecting member relative to a force point of the third connecting member and a direction of the force F2 is greater in the first stage than in the second stage.

[0020] Optionally, the leg support comprises at least one main connecting member, the main connecting member is rotatably connected to the seat frame, a vertical plane containing a rotation point of the main connecting member relative to the seat frame is defined as a first reference plane; an angle of rotation of the main connecting member relative to the first reference plane in the first stage is smaller than an angle of rotation of the main connecting member relative to the first reference plane in the second stage.

[0021] The driving member is connected to the main connecting member, the main connecting member is subjected to a force F1 from the driving member, an angle a between a momentary rotation direction of the main connecting member relative to a force point of the main connecting member and a direction of the force F1 is greater in the first stage than in the second stage; or the linkage assembly comprises a third connecting member, the third connecting member is connected to the main connecting member, the main connecting member is subjected to a force F2 from the third connecting member, an angle b between a momentary rotation direction of the main connecting member relative to a force point of the third connecting member and a direction of the force F2 is greater in the first stage than in the second stage.

[0022] Optionally, the linkage assembly comprises a first connecting member, a second connecting member and a third connecting member, the second connecting member is rotatably connected to the seat frame; the first connecting member is provided with two connecting points, the two connecting points of the first connecting member are rotatably connected to the base and the second connecting member respectively; the third connecting member is provided with two connecting points, the two connecting points of the third connecting member are rotatably connected to the main connecting member and the second connecting member respectively; a rotation point of the second connecting member relative to the seat frame is located between the connecting points of the first connecting member and the second connecting member and the connecting points of the third connecting member and the second connecting member.

[0023] Optionally, the linkage assembly further comprises a first connecting member and a second connecting member, the second connecting member is rotatably connected to the seat frame; the first connecting member is provided with two connecting points, the two connecting points of the first connecting member are rotatably connected to the base and the second connecting member respectively; the third connecting member is provided with two connecting points, the two connecting points of the third connecting member are rotatably connected to the main connecting member and the second connecting member respectively; the rotation point of the second connecting member relative to the seat frame is located between the connecting points of the first connecting member and the second connecting member and the connecting points of the third connecting member and the second connecting member.

[0024] Optionally, the linkage assembly further comprises a first connecting member and a second connecting member, the second connecting member is rotatably connected to the seat frame; the first connecting member is provided with two connecting points, the two connecting points of the first connecting member are rotatably connected to the base and the second connecting member respectively; the third connecting member is provided with two connecting points, the two connecting points of the third connecting member are rotatably connected to the main connecting member and the second connecting member respectively; the rotation point of the second connecting member relative to the seat frame is located between the connecting points of the first connecting member and the second connecting member and the connecting points of the third connecting member and the second connecting member.

[0025] Optionally, the linkage assembly further comprises a first connecting member and a second connecting member, the second connecting member is rotatably connected to the seat frame; the first connecting member is provided with two connecting points, the two connecting points of the first connecting member are rotatably connected to the base and the second connecting member respectively; the third connecting member is provided with two connecting points, the two connecting points of the third connecting member are rotatably connected to the main connecting member and the second connecting member respectively; the rotation point of the second connecting member relative to the seat frame is located between the connecting points of the first connecting member and the second connecting member and the connecting points of the third connecting member and the second connecting member.

[0026] Optionally, the driving member is provided with two connecting points,

[0027] The two connecting points of the driving member are rotatably connected to the seat frame and the second connecting member respectively, or the two connecting points of the driving member are rotatably connected to the seat frame and the main connecting member respectively, or the two connecting points of the driving member are rotatably connected to the seat frame and the base respectively.

[0028] Optionally, the linkage assembly further comprises a first connecting member and a second connecting member, the second connecting member is rotatably connected to the seat frame; the first connecting member is provided with two connecting points, the two connecting points of the first connecting member are rotatably connected to the base and the second connecting member respectively; the third connecting member is provided with two connecting points, the two connecting points of the third connecting member are rotatably connected to the main connecting member and the second connecting member respectively; the rotation point of the second connecting member relative to the seat frame is located between the connecting points of the first connecting member and the second connecting member and the connecting points of the third connecting member and the second connecting member.

[0029] The two connecting points of the driving member are rotatably connected to the seat frame and the main connecting member respectively, or the two connecting points of the driving member are rotatably connected to the seat frame and the base respectively.

[0030] In another aspect, the application provides a zero-gravity sofa structure, which adopts the following technical scheme:

[0031] A zero-gravity sofa structure comprises a base, a seat frame slidingly arranged on the base, a leg frame connected to the seat frame, a linkage assembly connected to the base and used to realize linkage of the seat frame and the leg frame, and a driving member used to drive the seat frame to move relative to the base and / or drive the leg frame to move relative to the seat frame;

[0032] The base is provided with a track, and the seat frame is provided with a moving member connected to the track and capable of moving along the track; the track comprises a first portion and a second portion, and a slope of a line connecting two ends of a track movement path of the moving member in the first portion is greater than a slope of a line connecting two ends of a track movement path of the moving member in the second portion.

[0033] Optionally, the track comprises a first track and a second track, two groups of the moving members are arranged, and the two groups of the moving members are respectively connected to the first track and the second track; a front side of the zero-gravity sofa structure is defined as a front direction, the first track is located in front of the second track; the first portion and the second portion are included in the first track, and the second portion is located in front of and above the first portion.

[0034] Optionally, the track comprises a first track and a second track, two groups of the moving members are arranged, and the two groups of the moving members are respectively connected to the first track and the second track; a front side of the zero-gravity sofa structure is defined as a front direction, the first track is located in front of the second track; the first portion and the second portion are included in the first track, and the second portion is located in front of and above the first portion.

[0035] In summary, the present application has at least one of the following beneficial technical effects.

[0036] The present application reasonably configures the power output of the driving member during the entire movement process, and improves the problem of excessive load of the driving member in the later stage of movement; mainly by adjusting the curvature or slope of the track, the upwarping speed of the front end relative to the rear end of the seat frame in the forward direction can be different in the first stage and the second stage, mainly the upwarping speed in the first stage is faster, so that the seat frame uses more force in the first stage to save the force requirement amount of the seat frame in the second stage.

[0037] The specific forms of the track curvature or slope mainly include two forms. First, no matter which form, the track comprises a first track and a second track, the first form is that the track at the front position extends forward and upward, and the slope becomes smaller as it extends forward; the second form is that the track at the rear position extends forward and downward, and the slope becomes smaller as it extends forward.

[0038] The installation position of the driving member can be various, such as the driving member is installed between the base and the seat frame, used to directly push the seat frame to move relative to the base, indirectly drive the leg frame to move through the linkage assembly; or the driving member is installed between the seat frame and the main connecting member of the leg frame, used to directly drive the leg frame to move, and indirectly drive the seat frame to move relative to the base through the linkage assembly; or the driving member is installed between the seat frame and the second connecting rod of the linkage assembly, used to drive the linkage assembly to move, thereby indirectly drive the leg frame to move, and indirectly drive the seat frame to move relative to the base. BRIEF DESCRIPTION OF DRAWINGS

[0039] Fig. 1 is a structural schematic diagram of a zero-gravity sofa according to an embodiment of the present application;

[0040] Fig. 2 is an enlarged schematic diagram of part A of Fig. 1 according to an embodiment of the present application;

[0041] Fig. 3 is a structural schematic diagram of a leg frame according to an embodiment of the present application;

[0042] Fig. 4 is a force schematic diagram of a leg frame according to an embodiment of the present application;

[0043] Fig. 5 is a schematic diagram for showing a first track position according to an embodiment of the present application;

[0044] Fig. 6 is a schematic diagram for showing an installation position of a driving member according to an embodiment of the present application;

[0045] Fig. 7 is a force schematic diagram of a leg frame according to an embodiment of the present application;

[0046] Fig. 8 is a schematic diagram for showing an installation position of a driving member according to an embodiment of the present application;

[0047] Fig. 9 is a schematic diagram for showing an installation position of a driving member according to an embodiment of the present application.

[0048] In the drawings, 1 is a base; 11 is a first track; 111 is a first part; 112 is a second part; 12 is a second track; 2 is a seat frame; 21 is a moving member; 4 is a leg frame; 41 is a first leg connecting rod; 42 is a second leg connecting rod; 43 is a third leg connecting rod; 44 is a leg bracket; 45 is a fifth leg connecting rod; 46 is a fourth leg connecting rod; 47 is a sixth leg connecting rod; 48 is a foot bracket; 49 is a second driving rod; 491 is a second extension rod; 5 is a driving member; 51 is a first power member; 52 is a second power member; 6 is a linkage assembly; 61 is a first connecting member; 62 is a second connecting member; 63 is a third connecting member; 64 is a first driving rod; 65 is a first extension rod; and 7 is a first reference surface. DETAILED DESCRIPTION

[0049] The application will be further described below in conjunction with the accompanying drawings. The following description relates to the drawings, in which the same or similar elements are denoted by the same reference numerals unless otherwise indicated.

[0050] When a person lies on the sofa, the upper body and the upper leg are about 128 degrees apart, and the upper leg and the lower leg are about 133 degrees apart. The zero-gravity sofa mainly comprises a seat frame, a backrest assembly connected to the rear side of the seat frame, a leg support (leg assembly) connected to the front side of the seat frame, and a driving member connected to the seat frame for driving the backrest assembly and the leg assembly to move. During the process of changing into a zero-gravity lying position, the seat frame moves forward and its front end is tilted upward, the backrest assembly can be flipped backward and downward relative to the seat frame, and the leg assembly can be flipped forward and upward relative to the seat frame and unfolded, and the unfolding process is that the footrest inside the leg assembly for supporting the user's lower leg moves away from the seat frame. Among them, a leg connecting rod for rotating connection on the seat frame is arranged in the leg assembly, and the driving member applies force to the leg connecting rod, thereby driving the leg assembly to unfold or fold; in the early stage of the process of changing into a zero-gravity lying position, the driving member applies a pushing force to the leg connecting rod, and the angle between the direction of the pushing force and the instantaneous rotation direction of the leg connecting rod is small, so that the driving member can push the leg assembly to unfold with less effort; in the later stage of the process of changing into a zero-gravity lying position, the driving member applies a pushing force to the leg connecting rod, and the angle between the direction of the pushing force and the instantaneous rotation direction of the leg connecting rod is large, so that the driving member needs to push the leg assembly to unfold with more effort. In the later stage of the process of changing into a zero-gravity lying position, the driving member also needs to output a larger force to overcome the gravity of the seat frame.

[0051] In order to reasonably allocate the power output of the driving member during the entire movement process and improve the problem of excessive load of the driving member in the later stage of movement, the application discloses a zero-gravity sofa structure.

[0052] Embodiment A, as shown in FIG. 1, comprises a base 1, a seat frame 2 slidingly arranged on the base 1, a leg support 4 connected to the seat frame 2, and a driving member 5 for driving the seat frame 2 to move relative to the base 1 and / or driving the leg support 4 to move relative to the seat frame 2. The base 1 is arranged horizontally and is a frame structure, and the seat frame 2 is arranged in a rectangular frame and is arranged above the base 1 and can move relative to the base 1, thereby converting the state.

[0053] In the embodiment, at least two states are included, which are initial state and zero-gravity state respectively. The front side of the sofa is regarded as the front direction. The initial state is the state before the conversion is started. The zero-gravity state is that the leg frame is flipped and unfolded forward, and the seat frame is moved forward and the front end is tilted upward compared with the rear end. Finally, when the user lies on the sofa of the embodiment, the height of the user's leg and knee can be substantially equal to the height of the heart, and the blood circulation of the human body can be relatively smooth. Of course, in other embodiments, the present scheme can not be limited to only including two states, and can also be the three states of the functional sofa more common: sitting posture, TV posture and lying posture. The lying posture is the zero-gravity state. The TV posture is between the sitting posture and the lying posture, that is, the leg frame is unfolded, and the backrest is not unfolded or unfolded at a small angle to realize that the user watches TV on the sofa. It can also include four or more states.

[0054] The movement process of the seat frame 2 includes a first stage and a second stage. The driving force received by the leg frame 4 in the first stage is less than the driving force received by the leg frame 4 in the second stage. The driving force received by the seat frame 2 in the first stage is greater than the driving force received by the seat frame 2 in the second stage. Therefore, the present scheme can reasonably configure the power output of the driving member 5 in the entire movement process, and improve the problem of excessive load of the driving member 5 in the later movement.

[0055] The driving force received by the seat frame 2 in the first stage is greater than the driving force received by the seat frame 2 in the second stage.

[0056] A set of tracks is arranged on the left and right side walls of the base 1, and each set of tracks includes a first track 11 and a second track 12. In the embodiment, the first track 11 is located in front of the second track 12. The first track 11 extends forward and upward, and the slope becomes smaller as it extends forward. The first track 11 includes a first part 111 and a second part 112. The slope of the line connecting the two ends of the first part 111 is greater than the slope of the line connecting the two ends of the second part 112. The second track 12 is arranged horizontally.

[0057] A set of moving members 21 is arranged on the left and right side walls of the seat frame 2, and each set of moving members 21 includes two moving members 21 connected to the first track 11 and the second track 12 respectively. Under the cooperation of the moving members 21 and the tracks, the seat frame 2 can move along a specific track. In the embodiment, the moving members 21 can be selected as rollers rotatably connected to the seat frame 2. In other embodiments, the moving members 21 can also be selected as sliding blocks fixed to the seat frame 2 and resistant to wear.

[0058] The slope of the line connecting the first end and the last end of the movement of the moving part 21 in the first track 11 in the first stage is greater than the slope of the line connecting the first end and the last end of the movement of the moving part 21 in the first track 11 in the second stage. In the first stage, the front end of the seat frame 2 is raised to a greater extent than the rear end when the seat frame 2 moves forward by the same distance, that is, the seat frame 2 is raised more quickly in the first stage. In order to support the seat frame 2 to be raised more quickly, a greater force is required to support the seat frame 2 to overcome gravity in the first stage than in the second stage, so that the driving force acting on the seat frame 2 in the first stage is greater than the driving force acting on the seat frame 2 in the second stage.

[0059] In the present embodiment, the movement range of the moving part 21 in the first track 11 in the first stage is equal to the first part 111, and the movement range of the moving part 21 in the first track 11 in the second stage is equal to the second part 112. In other embodiments, the movement range of the moving part 21 in the first track 11 in the first stage can not be equal to the first part 111, and the movement range of the moving part 21 in the first track 11 in the second stage can not be equal to the second part 112, that is, the two sections of the first track 11 corresponding to the first stage and the second stage can not be a fixed value, as long as the driving force acting on the seat frame 2 in the first stage is greater than the driving force acting on the seat frame 2 in the second stage. In one example, as long as the slope of the line connecting the first end and the last end of the section of the first track 11 corresponding to the first stage is greater than the slope of the line connecting the first end and the last end of the section of the first track 11 corresponding to the second stage.

[0060] The specific force exertion mode of the driving part 5 will be described below.

[0061] The base 1 is connected with a linkage assembly 6, which is used to realize linkage between the seat frame 2 and the leg support 4. In the present embodiment, the driving part 5 can be an electric push rod, the tail end of which is rotatably connected to the rear frame of the seat frame 2, and the front end, that is, the output end, is rotatably connected to the linkage assembly 6. When the driving part 5 moves, it can directly drive the linkage assembly 6 to move, and indirectly drive the leg support 4 to move, and indirectly drive the seat frame 2 to move relative to the base 1.

[0062] The linkage assembly 6 comprises a first connecting part 61, a second connecting part 62, and a third connecting part 63. The second connecting part 62 is rotatably connected to the seat frame 2. The first connecting part 61 is provided with two connecting points, and the two connecting points of the first connecting part 61 are rotatably connected to the base 1 and the second connecting part 62, respectively. The third connecting part 63 is provided with two connecting points, and the two connecting points of the third connecting part 63 are rotatably connected to the leg support 4 and the second connecting part 62, respectively. The rotation point of the second connecting part 62 relative to the seat frame 2 is located between the connecting points of the first connecting part 61 and the second connecting part 62 and the connecting points of the third connecting part 63 and the second connecting part 62.

[0063] The linkage assembly 6 is provided with two groups, and is arranged on the left and right sides of the seat frame 2 respectively. The first driving rod 64 is arranged between the two groups of linkage assemblies 6, and the two ends of the first driving rod 64 are fixed on the second connecting pieces 62 of the two groups of linkage assemblies 6 respectively. The middle part of the first driving rod 64 is fixed with the first extension rod 65, and the output end of the driving member 5 is rotatably connected to the first extension rod 65, so as to drive the first driving rod 64 and the second connecting piece 62 to move.

[0064] When the output end of the driving member 5 is retracted, the second connecting piece 62 is driven to rotate clockwise (with reference to FIG. 1), and the second connecting piece 62 will apply a force to the first connecting piece 61. However, the first connecting piece 61 is connected to the base 1, and the first connecting piece 61 cannot be pushed backward, so that the force of the second connecting piece 62 is generated in the opposite direction, and the seat frame 2 connected to the second connecting piece 62 moves forward relative to the base 1.

[0065] The driving force on the leg support 4 in the first stage is less than the driving force on the leg support 4 in the second stage.

[0066] As shown in FIGS. 1 and 2, the leg support 4 includes at least one main connecting piece rotatably connected to the seat frame 2. In this embodiment, two main connecting pieces are provided, which are a first leg connecting rod 41 and a second leg connecting rod 42. The upper ends of the first leg connecting rod 41 and the second leg connecting rod 42 are rotatably connected to the seat frame 2. The leg support 4 further includes a third leg connecting rod 43, a fourth leg connecting rod 46, and a leg bracket 44. One end of the third leg connecting rod 43 is rotatably connected to the lower end of the first leg connecting rod 41, and the other end is rotatably connected to the leg bracket 44. One end of the fourth leg connecting rod 46 is rotatably connected to the lower end of the second leg connecting rod 42, and the other end is rotatably connected to the leg bracket 44. The swing of one of the main connecting pieces can drive the leg bracket 44 to move closer or farther away.

[0067] The end of the fourth leg connecting rod 46 away from the second leg connecting rod 42 is provided with an extension section, and the rotation point of the fourth leg connecting rod 46 and the leg bracket 44 is located between the extension section and the end of the second leg connecting rod 42 close to the second leg connecting rod 42. The leg support 4 further includes a fifth leg connecting rod 45 and a sixth leg connecting rod 47. One end of the sixth leg connecting rod 47 is rotatably connected to the end of the extension section, and the other end is fixed with a foot bracket 48. One end of the fifth leg connecting rod 45 is rotatably connected to the fifth leg connecting rod 45, and the other end is rotatably connected to the sixth leg connecting rod 47.

[0068] As shown in Figs. 2 and 3, a vertical plane containing the rotation point of the main connecting member relative to the seat frame 2 is defined as the first reference plane 7; the rotation angle a of the main connecting member relative to the first reference plane 7 in the first stage is smaller than the rotation angle a of the main connecting member relative to the first reference plane 7 in the second stage. Therefore, in the first stage, the force for pushing the main connecting member to swing is relatively small, while in the second stage, a larger force is required.

[0069] As shown in Fig. 4, the driving member 5 transmits force to the main connecting member through the third connecting member 63, the force F2 acting on the main connecting member by the driving member 5, the angle c between the instantaneous rotation direction of the main connecting member relative to the force point of the driving member 5 and the direction of F2, the angle c in the first stage is larger than the angle c in the second stage. Therefore, in the first stage, the force for pushing the main connecting member to swing is relatively small, while in the second stage, a larger force is required.

[0070] Therefore, it is also achieved that the driving force acting on the leg support 4 in the first stage is smaller than the driving force acting on the leg support 4 in the second stage.

[0071] Embodiment B, as shown in Fig. 5, is different from embodiment A in that the first track 11 is located behind the second track 12, the first track 11 is arranged in an arc shape, and the front end thereof extends forward and downward, the first track 11 comprises a first portion 111 and a second portion 112 located in front of the first portion 111, the slope of the line connecting the two ends of the first portion 111 is larger than the slope of the line connecting the two ends of the second portion 112. The second track 12 is arranged horizontally.

[0072] The slope of the line connecting the two ends of the movement member 21 in the first track 11 in the first stage is larger than the slope of the line connecting the two ends of the movement member 21 in the second stage, then in the first stage, the upward angle of the front end of the seat frame 2 relative to the rear end is larger than the upward angle of the front end of the seat frame 2 relative to the rear end in the second stage, that is, the rear end of the seat frame 2 is raised faster in the first stage, and in order to support the seat frame 2 to be raised faster, a larger force is required to support the downward movement of the seat frame 2 in the first stage than in the second stage, which achieves that the driving force acting on the seat frame 2 in the first stage is larger than the driving force acting on the seat frame 2 in the second stage.

[0073] In the embodiment, the moving range of the moving member 21 in the first track 11 in the first stage is equal to the first part 111, and the moving range of the moving member 21 in the first track 11 in the second stage is equal to the second part 112. In other embodiments, the moving range of the moving member 21 in the first track 11 in the first stage can not be equal to the first part 111, and the moving range of the moving member 21 in the first track 11 in the second stage can not be equal to the second part 112, that is, the two sections of the first track 11 corresponding to the first stage and the second stage can not be a fixed value, as long as the driving force received by the seat frame 2 in the first stage is greater than the driving force received by the seat frame 2 in the second stage. In an example, as long as the slope of the line connecting the two ends of the section of the first track 11 corresponding to the first stage is greater than the slope of the line connecting the two ends of the section of the first track 11 corresponding to the second stage.

[0074] Embodiment C, as shown in FIGS. 6 and 7, differs from embodiment A in that a second driving rod 49 is fixedly connected between the two main connecting members on the left and right sides. In the embodiment, the second driving rod 49 is connected between the two second leg links 42, and a second extension rod 491 is fixed to the middle of the second driving rod 49. The output end of the driving member 5 is not connected to the second connecting member 62, but is rotatably connected to the second extension rod 491.

[0075] The force F1 received by the main connecting member from the driving member 5, the angle b between the instantaneous rotation direction of the main connecting member relative to the force point of the driving member 5 and the direction of F1, the angle b in the first stage is greater than the angle b in the second stage. Therefore, in the first stage, the force for pushing the main connecting member to swing is relatively small, and in the second stage, the force required is relatively large.

[0076] Embodiment D, as shown in FIG. 8, differs from embodiment A in that the output end of the driving member 5 is not connected to the rear frame of the seat frame 2, but is rotatably connected to the rear frame of the base 1; and the tail end of the driving member 5 is not connected to the rear frame of the seat frame 2, but is rotatably connected to the rear frame of the base 1.

[0077] Embodiment E, as shown in FIG. 9, differs from embodiment C in that the driving member 5 includes a first power member 51 and a second power member 52. The tail end of the first power member 51 is rotatably connected to the rear frame of the base 1, and the output end of the first power member 51 is rotatably connected to the rear frame of the seat frame 2. The tail end of the second power member 52 is rotatably connected to the rear frame of the seat frame 2, and the output end of the second power member 52 is rotatably connected to the second extension rod 491.

[0078] The embodiments of the present application are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, and thus: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A zero-gravity sofa structure, comprising: a base (1); a seat frame (2) slidingly arranged on the base (1); a leg frame (4) connected to the seat frame (2); a linkage assembly (6) connected to the base (1) and used to realize linkage of the seat frame (2) and the leg frame (4); and a driving member (5) used to drive movement of the seat frame (2) relative to the base (1) and / or movement of the leg frame (4) relative to the seat frame (2); wherein movement of the seat frame (2) comprises a first stage and a second stage, a driving force for driving movement of the leg frame (4) relative to the seat frame (2) is smaller in the first stage than in the second stage; a driving force for driving movement of the seat frame (2) relative to the base (1) is greater in the first stage than in the second stage.

2. The zero-gravity sofa structure of claim 1, wherein: The base (1) is provided with a track, and the seat frame (2) is provided with a moving member (21) connected to the track and capable of moving along the track; a slope of a line connecting two ends of movement of the moving member (21) along the track in the first stage is greater than a slope of a line connecting two ends of movement of the moving member (21) along the track in the second stage.

3. The zero-gravity sofa structure of claim 2, wherein: The track comprises a first track (11) and a second track (12), and the moving member (21) is provided in two groups, and the two groups of moving members (21) are respectively connected to the first track (11) and the second track (12); a front side of the zero-gravity sofa structure is defined as a front, the first track (11) is located in front of the second track (12), and the first track (11) comprises a first part (111) and a second part (112) located in front of and above the first part (111); in the first stage, the moving member (21) on the first track (11) is located in the first part (111), in the second stage, the moving member (21) on the first track (11) is located in the second part (112).

4. The zero-gravity sofa structure of claim 3, wherein: The first track (11) is arranged in an arc shape.

5. The zero-gravity sofa structure of claim 2, wherein: The track comprises a first track (11) and a second track (12), and the moving member (21) is provided in two groups, and the two groups of moving members (21) are respectively connected to the first track (11) and the second track (12); a front side of the zero-gravity sofa structure is defined as a front, the first track (11) is located in front of the second track (12), and the first track (11) comprises a first part (111) and a second part (112) located in front of and below the first part (111); in the first stage, the moving member (21) on the first track (11) is located in the first part (111), In the second stage, the moving element (21) on the first track (11) is located in the second part (112).

6. The zero-gravity sofa structure of claim 5, wherein: The first track (11) is arranged in an arc shape.

7. The zero-gravity sofa structure according to any one of claims 1-6, characterized in that: The leg support (4) comprises at least one main connecting element which is rotationally connected to the seat frame (2), and a vertical plane containing the rotation point of the main connecting element relative to the seat frame (2) is defined as a first reference plane (7); The rotation angle a of the main connecting element relative to the first reference plane (7) in the first stage is smaller than the rotation angle a of the main connecting element relative to the first reference plane (7) in the second stage.

8. The zero-gravity sofa structure according to any one of claims 1-6, characterized in that: The leg support (4) comprises at least one main connecting element which is rotationally connected to the seat frame (2); The driving element (5) is connected to the main connecting element, the main connecting element is subjected to a force F1 of the driving element (5), the instantaneous rotation direction of the main connecting element relative to the force point of the driving element (5) and the direction of the F1 form an angle b, the angle b in the first stage is greater than the angle b in the second stage; or the linkage assembly (6) comprises a third connecting element (63), the third connecting element (63) is connected to the main connecting element, the main connecting element is subjected to a force F2 of the third connecting element (63), the instantaneous rotation direction of the main connecting element relative to the force point of the third connecting element (63) and the direction of the F2 form an angle c, the angle c in the first stage is greater than the angle c in the second stage.

9. The zero-gravity sofa structure of claim 7, wherein: The driving element (5) is connected to the main connecting element, the main connecting element is subjected to a force F1 of the driving element (5), the instantaneous rotation direction of the main connecting element relative to the force point of the driving element (5) and the direction of the F1 form an angle b, the angle b in the first stage is greater than the angle b in the second stage; or the linkage assembly (6) comprises a third connecting element (63), the third connecting element (63) is connected to the main connecting element, the main connecting element is subjected to a force F2 of the third connecting element (63), the instantaneous rotation direction of the main connecting element relative to the force point of the third connecting element (63) and the direction of the F2 form an angle c, the angle c in the first stage is greater than the angle c in the second stage. The linkage assembly (6) comprises a first connecting element (61), a second connecting element (62) and a third connecting element (63), and the second connecting element (62) is rotationally connected to the seat frame (2); 10. The zero-gravity sofa structure of claim 7, wherein: The first connecting element (61) is provided with two connecting points, and the two connecting points of the first connecting element (61) are rotationally connected to the base (1) and the second connecting element (62) respectively; The third connecting element (63) is provided with two connecting points, and the two connecting points of the third connecting element (63) are rotationally connected to the main connecting element and the second connecting element (62) respectively; ​ The rotation point of the second connecting piece (62) relative to the seat frame (2) is between the connecting point of the first connecting piece (61) and the second connecting piece (62) and the connecting point of the third connecting piece (63) and the second connecting piece (62).

11. The zero-gravity sofa structure of claim 8, wherein: The linkage assembly (6) further comprises a first connecting piece (61) and a second connecting piece (62), and the second connecting piece (62) is rotationally connected to the seat frame (2); The first connecting piece (61) is provided with two connecting points, and the two connecting points of the first connecting piece (61) are rotationally connected to the base (1) and the second connecting piece (62) respectively; The third connecting piece (63) is provided with two connecting points, and the two connecting points of the third connecting piece (63) are rotationally connected to the main connecting piece and the second connecting piece (62) respectively; The rotation point of the second connecting piece (62) relative to the seat frame (2) is between the connecting point of the first connecting piece (61) and the second connecting piece (62) and the connecting point of the third connecting piece (63) and the second connecting piece (62).

12. The zero-gravity sofa structure of claim 9, wherein: The linkage assembly (6) further comprises a first connecting piece (61) and a second connecting piece (62), and the second connecting piece (62) is rotationally connected to the seat frame (2); The first connecting piece (61) is provided with two connecting points, and the two connecting points of the first connecting piece (61) are rotationally connected to the base (1) and the second connecting piece (62) respectively; The third connecting piece (63) is provided with two connecting points, and the two connecting points of the third connecting piece (63) are rotationally connected to the main connecting piece and the second connecting piece (62) respectively; The rotation point of the second connecting piece (62) relative to the seat frame (2) is between the connecting point of the first connecting piece (61) and the second connecting piece (62) and the connecting point of the third connecting piece (63) and the second connecting piece (62).

13. The zero-gravity sofa structure according to any one of claims 1-6, characterized in that: The leg support (4) comprises at least one main connecting piece rotationally connected to the seat frame (2); the linkage assembly (6) comprises a first connecting piece (61), a second connecting piece (62) and a third connecting piece (63), and the second connecting piece (62) is rotationally connected to the seat frame (2); The first connecting piece (61) is provided with two connecting points, and the two connecting points of the first connecting piece (61) are rotationally connected to the base (1) and the second connecting piece (62) respectively; The third connecting piece (63) is provided with two connecting points, and the two connecting points of the third connecting piece (63) are rotationally connected to the main connecting piece and the second connecting piece (62) respectively; The rotation point of the second connecting piece (62) relative to the seat frame (2) is between the connecting point of the first connecting piece (61) and the second connecting piece (62) and the connecting point of the third connecting piece (63) and the second connecting piece (62).

14. The zero-gravity sofa structure of claim 13, wherein: The driving member (5) is provided with two connecting points, The two connecting points of the driving member (5) are respectively rotatably connected to the seat frame (2) and the second connecting member (62); or the two connecting points of the driving member (5) are respectively rotatably connected to the seat frame (2) and the main connecting member; or the two connecting points of the driving member (5) are respectively rotatably connected to the seat frame (2) and the base (1).

15. The zero-gravity sofa structure according to any one of claims 1-6, characterized in that: The leg support (4) comprises at least one main connecting member rotatably connected to the seat frame (2); the driving member (5) is provided with two connecting points, The two connecting points of the driving member (5) are respectively rotatably connected to the seat frame (2) and the main connecting member; or the two connecting points of the driving member (5) are respectively rotatably connected to the seat frame (2) and the base (1).

16. A zero-gravity sofa structure comprising: a base (1); a seat frame (2) slidably arranged on the base (1); a leg support (4) connected to the seat frame (2); a linkage assembly (6) connected to the base (1) and used to realize linkage between the seat frame (2) and the leg support (4); and a driving member (5) used to drive the seat frame (2) to move relative to the base (1) and / or drive the leg support (4) to move relative to the seat frame (2); wherein the base (1) is provided with a track, and the seat frame (2) is provided with a moving member (21) connected to the track and capable of moving along the track; The track comprises a first portion (111) and a second portion (112), and the slope of the line connecting the two ends of the track along which the moving member (21) moves in the first portion (111) is greater than the slope of the line connecting the two ends of the track along which the moving member (21) moves in the second portion (112).

17. The zero-gravity sofa structure of claim 16, wherein: The track comprises a first track (11) and a second track (12), and the moving member (21) is provided with two groups, and the two groups of moving members (21) are respectively connected to the first track (11) and the second track (12); The front side of the zero-gravity sofa structure is defined as the front, and the first track (11) is located in front of the second track (12); The first portion (111) and the second portion (112) are included in the first track (11), and the second portion (112) is located in front of and above the first portion (111).

18. The zero-gravity sofa structure of claim 16, wherein: The track comprises a first track (11) and a second track (12), and the moving member (21) is provided with two groups, and the two groups of moving members (21) are respectively connected to the first track (11) and the second track (12); The front side of the zero-gravity sofa structure is defined as the front, and the first track (11) is located in front of the second track (12); The first portion (111) and the second portion (112) are included in the first track (11), and the second portion (112) is located in front of and above the first portion (111).

Images