Mechanical extension device for a functional sofa

Abstract

The application relates to a mechanical stretching device of a functional sofa, which comprises a seat frame and at least two leg stretching mechanisms, the leg stretching mechanism comprises an input unit and an execution unit for executing stretching under the pushing of the input unit, the input unit comprises a first input rod and a second input rod, the first input rod and the second input rod are connected to the seat frame and can swing relative to the seat frame; a first cross rod and a driving part are arranged in the seat frame, the first cross rod is fixed with a first adapter, different parts of the first adapter are respectively connected with the first cross rod and a second cross rod to form a rotating pair, and the driving part can push the first cross rod and can swing relative to the first cross rod. The application has much lower requirements on the performance of the driving part than a traditional stretching device, and the final expansion or contraction state is more stable.

Description

Technical Field

[0001] This application relates to the field of functional sofas, and more particularly to a mechanical extension device for a functional sofa. Background Technology

[0002] Retractable seats or functional sofas are gradually becoming the preferred choice for seats or sofas. Taking functional sofas as an example, such devices usually include mechanical extension devices that can change the user's posture and flexible coverings that wrap around the mechanical extension devices.

[0003] The mechanical extension device, according to its support for the human body, includes at least a seat frame, two back extension mechanisms, and two foot extension mechanisms. One back extension mechanism and one foot extension mechanism constitute an extension unit. The two extension units are respectively installed on two opposite sides of the seat frame and are symmetrically arranged. The back extension mechanism and the foot extension mechanism are often composed of a series of linkage structures that rely on the seat frame and can be linked together. The relative extension units are often fixed by a bridge based on a certain linkage.

[0004] The seat frame contains a power source that directly acts on the bridge, forcing the bridge to rotate so that the back extension mechanism and the foot extension mechanism extend or retract in sequence, thereby achieving the posture adjustment of the functional sofa. The foot extension mechanism changes before the back extension mechanism.

[0005] However, during posture adjustment, the bridge typically needs to rotate approximately 90° or close to 90°. Considering factors such as gradual change and self-locking, an electric cylinder is generally required as the power source. The angle change is achieved by hinged connection between the electric cylinder's push rod and the bridge. In other words, regardless of the leg extension mechanism's posture change configuration, at least one point must be where the bridge's rotation direction and the electric cylinder's extension / retraction direction are nearly perpendicular. This will result in at least one unstable state of the leg extension mechanism's extended or retracted state, or the need for an electric cylinder with extremely high rated thrust to achieve full extension or retraction. Summary of the Invention

[0006] In order to reduce the requirement for the rated thrust of the power source, this application provides a mechanical extension device for a functional sofa.

[0007] The mechanical extension device for a functional sofa provided in this application adopts the following technical solution:

[0008] A mechanical extension device for a functional sofa includes a seat frame and at least two leg extension mechanisms. Each leg extension mechanism includes an input unit and an execution unit that is pushed by the input unit to extend or retract. The input unit includes a first input rod and a second input rod, both of which are connected to the seat frame and can swing relative to the seat frame. A first crossbar and a driving member are provided inside the seat frame. A first adapter is fixed to the first crossbar, and different parts of the first adapter form a rotary joint with the first crossbar and the second crossbar, respectively. The driving member can push the first crossbar and can swing relative to the first crossbar.

[0009] By adopting the above technical solution, the first input rod and the second input rod have two rotation points relative to the first crossbar. These two rotation points can change position with the first crossbar, and the first and second input rods have rotation centers based on the frame. Thus, when the driving member pushes the first crossbar, the horizontal movement of the first crossbar will force the first and second input rods to swing relative to their respective rotation centers. During this process, since the swinging of the first and second input rods is synchronous, the first crossbar and the two rotation points of the first and second input rods also swing synchronously. Therefore, the rotation amplitude of the first crossbar relative to the driving member is extremely small during this process, and if the proportions of the first input rod, the second input rod, the first crossbar, and the driving member are set appropriately, almost no rotation can be achieved. In other words, within this system, the rotation of the first crossbar can be ignored, and it can be considered as only moving. The rotation range of the first and second input rods is close to 180°. Combined with the small swing of the drive component, the drive component can also drive the first and second input rods by a range close to 180°. In reality, the swing range of the first input rod corresponding to the extension and retraction of the leg extension mechanism is generally around 90°. In other words, the force transmission efficiency of the drive component driving the first and second input rods is very high. Correspondingly, the same extension and retraction effect can be achieved by using a drive component with a much smaller rated thrust than that of the drive component in traditional extension devices. The performance requirements of the drive component are much lower than those of traditional extension devices, and the final extension or retraction state is more stable.

[0010] In addition, the first crossbar, the first input rod, and the second input rod together form a quadrilateral structure with the seat frame. When driven, the first input rod and the second input rod are subjected to force simultaneously. Compared with the traditional single-rod drive, the stability is much higher during the entire extension and retraction process.

[0011] Optionally, the first adapter includes a first connecting plate fixed to the side wall of the first crossbar and a first lug located at the end of the first crossbar. The first lug is fixed to the first connecting plate, and the side walls of the first lug near both ends are respectively riveted to the first input rod and the second input rod.

[0012] By adopting the above technical solution, the rotation points of the first crossbar relative to the first input rod and the second input rod can be distributed on both sides of the end of the first crossbar, resulting in better stability during driving; and a small elastic space is also formed between the first lug and the first crossbar, giving the first crossbar a certain offset compensation and vibration damping capability.

[0013] Optionally, the connection point between the first input rod and the rotating joint of the seat frame is designated as connection point one, the connection point between the second input rod and the rotating joint of the seat frame is designated as connection point two, the connection point between the first input rod and the rotating joint of the first adapter is designated as connection point three, and the connection point between the second input rod and the rotating joint of the first adapter is designated as connection point four. The line connecting connection point one and connection point two is parallel to the line connecting connection point three and connection point four.

[0014] By adopting the above technical solution, the extension and retraction process of the leg extension mechanism can be made more stable.

[0015] Optionally, the first input rod includes a first seat rod portion, a first bending portion, and a first connecting rod portion that are integrally formed and connected in sequence. The first seat rod portion is connected to the seat frame, and the first connecting rod portion is connected to the execution unit. The second input rod includes a second base rod portion, a second bending portion, a second seat rod portion, a second bending portion, and a second connecting rod portion that are integrally formed and connected in sequence. The second base rod portion is connected to the seat frame, and the second connecting rod portion is connected to the execution unit. When the leg extension device retracts, the second seat rod portion may partially overlap with the first seat rod portion, and the second connecting rod portion may partially overlap with the first connecting rod portion.

[0016] By adopting the above technical solution, the first and second input rods can overlap to a certain extent during the retraction process, thereby reducing interference, expanding the swing range of the first and second input rods, and making full use of the retraction space. This prevents the sofa user from easily touching the footrest when the leg extension mechanism retracts. Furthermore, it also avoids collisions between the first and second input rods during the retraction process.

[0017] Optionally, a pad is provided at the intersection of the second connecting rod and the first connecting rod, and the second seat rod and the first connecting rod are located on the same plane.

[0018] By adopting the above technical solution, the pad allows the first input rod and the second input rod to be misaligned even when they are connected to the same connecting rod, and also provides a basis for the overall misalignment of the first input rod and the second input rod.

[0019] Optionally, a second crossbar is fixed between the first input rods of the two leg extension mechanisms.

[0020] By adopting the above technical solution, the stability of the leg extension mechanism during the extension and retraction process can be increased.

[0021] Optionally, a second crossbar is provided between the second input rods of the two leg extension mechanisms, and a second adapter is fixed to the end of the second crossbar, which is fixedly connected to the second input rod.

[0022] By adopting the above technical solution, the stability of the leg extension mechanism during the extension and retraction process can be increased.

[0023] Optionally, the execution unit includes a first link, a second link, and a foot rest assembly. Different parts of the first link form revolute joints with the foot rest assembly and the first input rod, respectively. The first link and the second input rod are staggered and form revolute joints at the staggered parts. The staggered point of the first link and the second input rod is located between the foot rest assembly and the first input rod. The part of the second input rod away from the seat frame with the staggered part as a reference point is connected to the second link and forms a revolute joint. The second link is connected to the foot rest assembly and forms a revolute joint.

[0024] By adopting the above technical solution, the rotating pairs between the components mutually restrict each other, and when the first input rod and the second input rod swing, the execution unit retracts or expands relative to the input unit.

[0025] Optionally, the second adapter includes an integrally formed second connecting plate and a second ear plate. The second connecting plate is fixed to the second crossbar. The middle part of the second ear plate is hollow. The two sides of the hollow part of the second ear plate are respectively fixedly connected to the second input rod. The rotating joint of the first connecting rod and the second input rod is formed by a movable riveting method. The riveting part corresponding to the movable riveting is located in the hollow part of the second ear plate.

[0026] By adopting the above technical solution, on the one hand, a small elastic space is formed between the second ear plate and the second crossbar, giving the second crossbar a certain degree of offset compensation and vibration damping capability. On the other hand, it protects the riveting points of the first connecting rod and the second input rod. Furthermore, the connection point between the second ear plate and the second input rod is located on both sides of the riveting joint of the first connecting rod and the second input rod, making it less likely for the force applied by the second crossbar to interfere with the swing of the second input rod.

[0027] Optionally, the foot support assembly includes a front foot support plate, a connecting plate, and a rear foot support plate that are sequentially and movably riveted to each other. The front foot support plate is movably riveted to a second connecting rod, and the end of the rear foot support plate away from the connecting plate is movably riveted to a first connecting rod. The middle part of the rear foot support plate protrudes in a direction away from the line connecting the two ends of the rear foot support plate, and the protruding part is movably riveted to the second connecting rod.

[0028] By adopting the above technical solution, the front and rear footrests can deflect themselves while swinging with the first and second links, thus achieving the switching between vertical and horizontal states.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. When the driving component pushes the first crossbar, the horizontal movement of the first crossbar forces the first and second input rods to swing relative to their respective rotation centers. During this process, since the swinging of the first and second input rods is synchronous, the two rotation points of the first crossbar and the first and second input rods also swing synchronously. Therefore, the rotation amplitude of the first crossbar relative to the driving component is extremely small during this process, and it can even achieve almost no rotation if the proportions between the first and second input rods, the first crossbar, and the driving component are set appropriately. In other words, within this system, the rotation of the first crossbar can be ignored, and it can be considered as only moving. The rotation range of the first and second input rods is close to 180°. Combined with the small swing of the drive component, the drive component can also drive the first and second input rods by a range close to 180°. In fact, the swing range of the first input rod corresponding to the extension and retraction of the leg extension mechanism is generally around 90°. That is to say, the force transmission efficiency of the drive component driving the first and second input rods is very high. Accordingly, the same extension and retraction effect can be achieved by using a drive component with a rated thrust much smaller than that of the drive component of the traditional extension device. The performance requirements of the drive component are much lower than those of the traditional extension device, and the final extension or retraction state is more stable.

[0031] 2. The first crossbar, the first input rod, and the second input rod together form a quadrilateral structure with the seat frame. When driven, the first input rod and the second input rod are subjected to force simultaneously. Compared with the traditional single-rod drive, the stability is much higher during the entire extension and retraction process.

[0032] 3. The rotation points of the first crossbar relative to the first input rod and the second input rod can be distributed on both sides of the end of the first crossbar, resulting in better stability during driving; and a small elastic space is formed between the first lug and the first crossbar, giving the first crossbar a certain offset compensation and vibration damping capability. Attached Figure Description

[0033] Figure 1 This is an overall structural diagram of the mechanical extension device in this embodiment.

[0034] Figure 2 This is a structural diagram of the leg extension mechanism in the unfolded state of this embodiment.

[0035] Figure 3 This is a structural diagram of the leg extension mechanism from a side-flipping perspective in this embodiment.

[0036] Figure 4 This is a structural diagram of the leg extension mechanism in the retracted state in this embodiment.

[0037] Explanation of reference numerals in the attached drawings: 1. Seat frame; 11. First crossbar; 12. Drive unit; 13. First adapter; 131. First connecting plate; 132. First ear plate; 14. Second crossbar; 15. Second adapter; 151. Second connecting plate; 152. Second ear plate; 2. Input unit; 21. First input rod; 211. First seat rod part; 212. First turning part; 213. First connecting rod part; 22. Second input rod; 221. Second base rod part; 222. Second bending part; 223. Second seat rod part; 224. Second turning part; 225. Second connecting rod part; 23. Pad; 3. Execution unit; 31. First connecting rod; 32. Second connecting rod; 33. Footrest assembly; 331. Front footrest plate; 332. Connecting plate; 333. Rear footrest plate; 101. Back extension mechanism; 102. Leg extension mechanism. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0039] This application discloses a mechanical extension device for a functional sofa.

[0040] Example 1:

[0041] Reference Figure 1 A mechanical extension device for a functional sofa includes a seat frame 1, two leg extension mechanisms 102, and two back extension mechanisms 101. Each leg extension mechanism 102 and each back extension mechanism 101 form a set, with the two sets respectively installed on opposite sides of the seat frame 1. The leg extension mechanisms 102 control the flipping and lifting of the footrests, while the back extension mechanisms 101 control the flipping of the backrest. This allows for three posture changes: sitting, TV-like, and reclining. The back extension mechanism 101 of this application is adaptable to any type of back extension mechanism 101 with three posture changes. Our company has also disclosed various prior art related to back extension mechanisms 101, and this application will not elaborate further on the back extension mechanism 101.

[0042] The leg extension mechanism 102 includes an input unit 2 and an execution unit 3, wherein the input unit 2 is connected to the seat frame 1, and the execution unit 3 is used to install the foot pad. The execution unit 3 is pushed by the input unit 2 to perform extension and retraction.

[0043] Reference Figure 1 and Figure 2 The input unit 2 includes a first input rod 21 and a second input rod 22. The first input rod 21 is movably riveted to the seat frame 1 at one end. The second input rod 22 is movably riveted to the seat frame 1 at a position near its end, and the corresponding end is movably riveted to the input end of the back extension mechanism 101.

[0044] Reference Figure 2 and Figure 3 The first input rod 21 includes a first seat rod portion 211, a first turning portion 212 and a first connecting rod portion 213 that are integrally formed and connected in sequence. The first seat rod portion 211 is connected to the seat frame 1 and the first connecting rod portion 213 is connected to the execution unit 3.

[0045] The second input rod 22 includes a second base rod portion 221, a second bent portion 222, a second seat rod portion 223, a second turning portion 224, and a second connecting rod portion 225, all integrally formed and connected in sequence. The second base rod portion 221 is connected to the seat frame 1. A pad 23 is provided on the side wall of the second connecting rod portion 225, and the second connecting rod portion 225 is connected to the execution unit 3 through the pad 23. The second seat rod portion 223 and the first connecting rod portion 213 are located on the same plane.

[0046] Reference Figure 2 and Figure 4 When the leg extension mechanism 102 retracts to its final state, the second seat post 223 partially overlaps with the first seat post 211, and the second connecting post 225 partially overlaps with the first connecting post 213. The second turning part 224 partially overlaps with the first turning part 212. This avoids impact during retraction and reduces the volume occupied after retraction.

[0047] Reference Figure 1 and Figure 2 The seat frame 1 contains a first crossbar 11 and a driving component 12. In this embodiment, the driving component 12 is an electric cylinder, wherein the telescopic rod of the electric cylinder is hinged to the side wall of the first crossbar 11, and the cylinder body of the electric cylinder is hinged to the frame. The first crossbar 11 is located between the two leg extension mechanisms 102 and has a first adapter 13 fixed at both ends. The first adapter 13 includes a first connecting plate 131 fixed to the side wall of the first crossbar 11 and a first ear piece 132 located at the end of the first crossbar 11. The first ear piece 132 is fixed to the first connecting plate 131, and the side walls of the first ear piece 132 near both ends are movably riveted to the first input rod 21 and the second input rod 22, respectively. When the leg extension mechanism 102 retracts to its final state, the first ear piece 132 partially falls between the first input rod 21 and the second input rod 22.

[0048] Reference Figure 2 and Figure 3 The connection point between the first input rod 21 and the rotating joint of the seat frame 1 is designated as connection point one, the connection point between the second input rod 22 and the rotating joint of the seat frame 1 is designated as connection point two, the connection point between the first input rod 21 and the rotating joint of the first adapter 13 is designated as connection point three, and the connection point between the second input rod 22 and the rotating joint of the first adapter 13 is designated as connection point four. The lines connecting connection points one, two, three and four form a parallelogram.

[0049] Reference Figure 2 and Figure 3 The execution unit 3 includes a first connecting rod 31, a second connecting rod 32, and a foot rest assembly 33. Both ends of the first connecting rod 31 are movably riveted to the foot rest assembly 33 and the first input rod 21, respectively. The first connecting rod 31 and the second input rod 22 are staggered and movably riveted at the staggered points, which are separated by a spacer 23. The staggered point of the first connecting rod 31 and the second input rod 22 is located between the foot rest assembly 33 and the first input rod 21. The end of the second input rod 22 away from the seat frame 1 is movably riveted to the second connecting rod 32, and the end of the second connecting rod 32 away from the second input rod 22 is connected to the foot rest assembly 33, forming a rotating pair.

[0050] Reference Figure 1 and Figure 2 The footrest assembly 33 includes a front footrest 331, a connecting plate 332, and a rear footrest 333 that are riveted together in sequence. The front footrest 331 is riveted to the second connecting rod 32. The end of the rear footrest 333 away from the connecting plate 332 is riveted to the first connecting rod 31. The middle part of the rear footrest 333 protrudes in a direction away from the line connecting the two ends of the rear footrest 333, and the protruding part is riveted to the second connecting rod 32.

[0051] Reference Figure 1 and Figure 3 To further enhance the stability of the leg extension mechanism 102, a second crossbar 14 is provided between the second input rods 22 of the two leg extension mechanisms 102. This second crossbar 14 can be directly connected to the leg extension mechanism 102 or connected to it via a second adapter 15. Furthermore, the second crossbar 14 can connect to any rod in the leg extension mechanism 102 without interference. This embodiment uses the addition of the second adapter 15 and connection to the second input rod as an example. The second adapter 15 is fixed to both ends of the second crossbar 14. The second adapter 15 includes an integrally formed second connecting plate 151 and a second ear plate 152. The second connecting plate 151 is fixed to the second crossbar 14. The second ear plate 152 has a hollow center, and the portions on both sides of the hollow portion are fixedly connected to the second input rods 22. The riveting components corresponding to the movable riveting of the first connecting rod 31 and the second input rod 22 are located in the hollow portion of the second ear plate 152.

[0052] The implementation principle of this embodiment is as follows:

[0053] When unfolded:

[0054] The driving component 12 pushes the first crossbar 11 to move. The horizontal movement of the first crossbar 11 forces the first input rod 21 and the second input rod 22 to swing relative to their respective rotation centers. During this process, the swinging of the first input rod 21 and the second input rod 22 is synchronized. During this process, the first crossbar 11 rotates slightly or not at all relative to the driving component 12. The swinging of the first input rod 21 and the second input rod 22 causes the first connecting rod 31 and the second connecting rod 32 to unfold and lift. Correspondingly, the surfaces of the front footrest 331 and the rear footrest 333 gradually flip to a near-horizontal state.

[0055] During contraction:

[0056] The drive component 12 pulls back the first crossbar 11, and the other components move in opposite directions when they are unfolded.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mechanical extension device for a functional sofa, characterized by: The device comprises a seat frame (1) and at least two leg stretching mechanisms (102), the leg stretching mechanism (102) comprising an input unit (2) and an execution unit (3) for stretching executed by the input unit (2), the input unit (2) comprising a first input rod (21) and a second input rod (22), the first input rod (21) and the second input rod (22) are connected to the seat frame (1) and can swing relative to the seat frame (1); the seat frame (1) is provided with a first cross rod (11) and a driving member (12), the first cross rod (11) is fixed with a first adapter (13), different parts of the first adapter (13) respectively form a rotating pair with the first input rod (21) and the second input rod (22), and the driving member (12) can push the first cross rod (11) and can swing relative to the first cross rod (11). The first adapter (13) comprises a first connecting plate (131) fixed to the side wall of the first cross rod (11) and a first ear piece (132) located at the end of the first cross rod (11), the first ear piece (132) is fixed with the first connecting plate (131), and the side walls close to the two ends of the first ear piece (132) are respectively movably riveted with the first input rod (21) and the second input rod (22).

2. A mechanical extender device for a functional sofa according to claim 1, characterized in that: The connecting point of the first input rod (21) and the rotating pair of the seat frame (1) is set as connecting point one, the connecting point of the second input rod (22) and the rotating pair of the seat frame (1) is set as connecting point two, the connecting point of the first input rod (21) and the rotating pair of the first adapter (13) is set as connecting point three, and the connecting point of the second input rod (22) and the rotating pair of the first adapter (13) is set as connecting point four, the line connecting connecting point one and connecting point two is parallel to the line connecting connecting point three and connecting point four.

3. A mechanical extender device for a sofa according to claim 1, characterized in that: The first input rod (21) comprises a first seat rod part (211), a first turning part (212) and a first connecting rod part (213) integrally formed and connected in sequence, the first seat rod part (211) is connected with the seat frame (1), and the first connecting rod part (213) is connected with the execution unit (3); the second input rod (22) comprises a second base rod part (221), a second bending part (222), a second seat rod part (223), a second turning part (224) and a second connecting rod part (225) integrally formed and connected in sequence, the second base rod part (221) is connected with the seat frame (1), and the second connecting rod part (225) is connected with the execution unit (3); when the leg stretching device is contracted, the second seat rod part (223) can partially overlap with the first seat rod part (211), and the second connecting rod part (225) can partially overlap with the first connecting rod part (213).

4. A mechanical extender device for a sofa according to claim 3, wherein: The staggered part of the second connecting rod part (225) and the first connecting rod (31) is provided with a pad (23) located between the second connecting rod part (225) and the first connecting rod (31), and the second seat rod part (223) and the first connecting rod part (213) are located in the same plane.

5. A mechanical extender device for a sofa according to claim 1, characterized in that: The first input rod (21) of the two leg stretching mechanisms (102) is fixed with a second cross rod (14).

6. A mechanical extender device for a sofa according to claim 1, characterized in that: Second crossbar (14) is arranged between the second input rods (22) of the two leg stretching mechanisms (102), and the end of the second crossbar (14) is fixed with a second adapter (15) which is fixedly connected with the second input rod (22).

7. A mechanical extender device for a sofa according to claim 6, wherein: The execution unit (3) comprises a first connecting rod (31), a second connecting rod (32) and a foot rest assembly (33), different parts of the first connecting rod (31) are respectively connected with the foot rest assembly (33) and the first input rod (21) to form a rotating pair, the first connecting rod (31) is staggered with the second input rod (22) and forms a rotating pair at the staggered part, the staggered point of the first connecting rod (31) and the second input rod (22) is located between the foot rest assembly (33) and the first input rod (21), the part of the second input rod (22) away from the seat frame (1) is connected with the second connecting rod (32) at the staggered part as a reference point to form a rotating pair, and the second connecting rod (32) is connected with the foot rest assembly (33) to form a rotating pair.

8. A mechanical extender device for a sofa according to claim 7, characterized in that: The second adapter (15) comprises an integrally formed second connecting plate (151) and a second ear plate (152), the second connecting plate (151) is fixed with the second crossbar (14), the middle part of the second ear plate (152) is hollow, and the parts on both sides of the hollow part of the second ear plate (152) are fixedly connected with the second input rod (22); the rotating pair of the first connecting rod (31) and the second input rod (22) is formed by movable riveting, and the corresponding riveting part of the movable riveting is located in the hollow part of the second ear plate (152).

9. A mechanical extender device for a sofa according to claim 7, characterized in that: The foot rest assembly (33) comprises a front foot rest plate (331), a connecting plate (332) and a rear foot rest plate (333) which are sequentially movably riveted, the front foot rest plate (331) is movably riveted with the second connecting rod (32), one end of the rear foot rest plate (333) away from the connecting plate (332) is movably riveted with the first connecting rod (31), and the middle part of the rear foot rest plate (333) is protrusively arranged away from the connecting line of both ends of the rear foot rest plate (333), and the protruding part is movably riveted with the second connecting rod (32).

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