Seat stretching device and electric swing chair with same

Abstract

The utility model provides a seat stretching device and an electric swing chair with the seat stretching device. The seat stretching device comprises a supporting seat and a seat body, the swinging assembly is mounted on the supporting seat in a swinging manner; the stretching assembly comprises a bottom frame mounting part, a foot rest part, a leg stretching part and a backrest stretching part, the bottom frame mounting part is rotatably mounted on the swinging assembly, and the leg stretching part and the backrest stretching part are hinged to the two ends of the bottom frame mounting part respectively; the leg stretching part and the backrest stretching part are matched with each other, so that the stretching assembly has a sitting posture position and a lying posture position; the footrest part is positioned at one end, away from the backrest extension part, of the leg extension part; when the stretching assembly is in the lying posture position, the difference value between the highest point of the foot rest piece and the highest point of the backrest stretching component is larger than the preset height difference h. According to the technical scheme, the problem that an electric seat in the prior art is single in function can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of seat mechanisms, and in particular, to a seat stretching device and an electric rocking chair equipped with the same. Background Art

[0002] Currently, with the continuous improvement of users' living standards, users have more pursuits for the comfort of sofas. When choosing an electric sofa, users are no longer limited to a single function.

[0003] However, most electric sofas on the market only have a zero-gravity function and cannot fully meet the usage needs of users. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a seat stretching device and an electric rocking chair equipped with the same, so as to solve the problem of relatively single functions of electric seats in the prior art.

[0005] To achieve the above object, according to one aspect of the utility model, a seat stretching device is provided, including:

[0006] A support seat;

[0007] A swing assembly swingably mounted on the support seat;

[0008] A stretching assembly, the stretching assembly includes a bottom frame mounting member, a footrest member, a leg stretching member and a backrest stretching member. The bottom frame mounting member is rotatably mounted on the swing assembly. The leg stretching member and the backrest stretching member are respectively hinged to two ends of the bottom frame mounting member, so that the leg stretching member and the backrest stretching member cooperate with each other to enable the stretching assembly to have a sitting position and a lying position; the footrest member is located at one end of the leg stretching member away from the backrest stretching member;

[0009] Wherein, when the stretching assembly is in the lying position, the difference between the highest point of the footrest member and the highest point of the backrest stretching member is greater than a predetermined height difference h.

[0010] Further, the value range of the predetermined height difference h is 200mm ≤ h ≤ 400mm.

[0011] Further, the swing assembly includes a swing member, a first swing arm and a second swing arm. The first end of the first swing arm and the first end of the second swing arm are respectively rotatably connected to the support seat. The second end of the first swing arm and the second end of the second swing arm are respectively rotatably connected to the swing member to drive the swing member to swing.

[0012] Further, a first limiting portion is provided on the first swing arm, and a first limiting cooperation portion and a second limiting cooperation portion that are in limiting cooperation with the first limiting portion are provided on the swinging member, so as to limit the swing of the swinging member between the first limiting cooperation portion and the second limiting cooperation portion; and / or,

[0013] A second limiting portion is provided on the second swing arm, and a third limiting cooperation portion and a fourth limiting cooperation portion that are in limiting cooperation with the second limiting portion are provided on the swinging member, so as to limit the swing of the swinging member between the third limiting cooperation portion and the fourth limiting cooperation portion.

[0014] Further, when a first limiting portion is provided on the first swing arm, the first limiting portion is a limiting protrusion, and both the first limiting cooperation portion and the second limiting cooperation portion are limiting grooves; and / or,

[0015] When a second limiting portion is provided on the second swing arm, the second limiting portion is a limiting protrusion, and both the third limiting cooperation portion and the fourth limiting cooperation portion are limiting grooves.

[0016] Further, when a first limiting portion is provided on the first swing arm, the first limiting cooperation portion and the second limiting cooperation portion are spaced apart by a first preset distance, so that the maximum swing angle of the first swing arm is a, 67° ≤ a ≤ 71°; and / or,

[0017] When a second limiting portion is provided on the second swing arm, the third limiting cooperation portion and the fourth limiting cooperation portion are spaced apart by a second preset distance, so that the maximum swing angle of the second swing arm is b, 72° ≤ b ≤ 76°.

[0018] Further, the seat extension device further includes a swing limiting member, and the leg extension member is connected to the swing limiting member to drive the swing limiting member to move;

[0019] Wherein, a first limiting portion is provided on the first swing arm, and the swing limiting member includes a fifth limiting cooperation portion for limiting cooperation with the first limiting portion to limit the swing of the first swing arm when the leg extension member extends to the lying position; and / or,

[0020] A second limiting portion is provided on the second swing arm, and the swing limiting member includes a sixth limiting cooperation portion for limiting cooperation with the second limiting portion to limit the swing of the second swing arm when the leg extension member extends to the lying position.

[0021] Further, the swing limiting member includes a transmission rod and a limiting plate, the limiting plate is fixedly connected to the transmission rod relatively, and the leg extension member is connected to the transmission rod to drive the transmission rod to move;

[0022] Wherein, when a first limiting part is provided on the first swing arm, the first limiting part is a limiting protrusion, the fifth limiting cooperation part is a limiting groove, the fifth limiting cooperation part is arranged on a limiting plate, and the limiting plate further has a first guiding surface and a second guiding surface, and the first guiding surface and the second guiding surface respectively extend outwards along the two sides of the fifth limiting cooperation part to guide the movement of the first limiting part in different directions when the transmission rod moves; and / or,

[0023] When a second limiting part is provided on the second swing arm, the second limiting part is a limiting protrusion, the sixth limiting cooperation part is a limiting groove, the sixth limiting cooperation part is arranged on the limiting plate, and the limiting plate further has a third guiding surface and a fourth guiding surface, and the third guiding surface and the fourth guiding surface respectively extend outwards along the two sides of the sixth limiting cooperation part to guide the movement of the second limiting part in different directions when the transmission rod moves.

[0024] Furthermore, the seat stretching device further includes a transmission rod, and the leg stretching component is connected to the transmission rod to drive the transmission rod to move; the seat stretching device further includes a backrest transmission assembly, and the backrest transmission assembly includes a first driving rod, a second driving rod and a third driving rod;

[0025] Wherein, the first driving rod is respectively hinged to the backrest stretching component and the transmission rod to drive the backrest stretching component to move when the leg stretching component moves, the first end of the second driving rod and the third driving rod are hinged to each other, the other end of the second driving rod is hinged to the bottom frame mounting component, and the third driving rod is hinged to the swing assembly.

[0026] Furthermore, the bottom frame mounting component is used for mounting a seat cushion. When the stretching assembly is in the lying position,

[0027] the included angle between the bottom surface of the seat cushion and the horizontal plane is c, and 15° ≤ c ≤ 45°; and / or,

[0028] the included angle between the extending direction of the backrest stretching component and the bottom surface of the seat cushion is d, and 122° ≤ d ≤ 148°; and / or,

[0029] The footrest is of a plate-like structure, and the included angle between the extending direction of the footrest and the horizontal plane is e, and 4° ≤ e ≤ 20°.

[0030] According to another aspect of the present invention, there is provided an electric rocking chair, including the seat stretching device mentioned above.

[0031] Applying the technical solution of the present utility model not only has a zero - gravity function, that is, when the extension assembly is in a lying position, there is a certain height difference between the footrest and the backrest extension part, so that the user's feet are higher than the user's heart position, thus forming a zero - gravity experience, but also has a swinging function, that is, when the user needs, the swinging assembly can drive the extension assembly to swing, thereby greatly improving the user's experience. It can be seen that the seat extension device of the present utility model simultaneously has a zero - gravity function and a swinging function, can meet different usage requirements of users, and thus can solve the problem that the functions of electric seats in the prior art are relatively single. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The schematic diagrams in the specification forming a part of this application are used to provide a further understanding of the present utility model. The illustrative embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0033] Figure 1 Fig. 9 shows a partial structural schematic diagram of the seat extension device provided by the embodiment of the present utility model in a sitting position from one perspective;

[0034] Figure 2 Fig. 13 shows a structural schematic diagram of the seat extension device provided by the embodiment of the present utility model in a sitting position from another perspective;

[0035] Figure 3 Fig. 17 shows a partial structural schematic diagram of the seat extension device provided by the embodiment of the present utility model in a lying position from one perspective;

[0036] Figure 4 Fig. 21 shows a structural schematic diagram of the seat extension device provided by the embodiment of the present utility model in a lying position from another perspective;

[0037] Figure 5 Fig. 25 shows a swinging schematic diagram of the first swing arm of the seat extension device provided by the embodiment of the present utility model;

[0038] Figure 6 Fig. 29 shows a swinging schematic diagram of the second swing arm of the seat extension device provided by the embodiment of the present utility model.

[0039] Among them, the above - mentioned drawings include the following reference numerals:

[0040] 100, support base; 101, first connecting rod; 102, second connecting rod;

[0041] 10. Swing assembly; 11. Swing member; 111. First limit mating portion; 112. Second limit mating portion; 12. First swing arm; 121. First limit portion; 13. Second swing arm;

[0042] 20. Extension assembly; 21. Footrest member; 22. Leg extension member; 23. Bottom frame mounting member; 24. Backrest extension member;

[0043] 30. Swing limit member; 31. Transmission rod; 32. Limit plate; 321. Fifth limit mating portion; 322. First guide surface; 323. Second guide surface;

[0044] 40. Backrest transmission assembly; 41. First drive rod; 42. Second drive rod; 43. Third drive rod;

[0045] 50. Drive assembly; 51. Driving member; 52. Drive rod; 53. Guide member. Detailed implementation mode

[0046] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0047] As Figures 1 to 6 shown, Embodiment 1 of the present utility model provides a seat extension device. The seat extension device includes a support seat 100, a swing assembly 10, and an extension assembly 20. The swing assembly 10 is swingably mounted on the support seat 100. The extension assembly 20 includes a bottom frame mounting member 23, a footrest member 21, a leg extension member 22, and a backrest extension member 24. The bottom frame mounting member 23 is rotatably mounted on the swing assembly 10. The leg extension member 22 and the backrest extension member 24 are respectively hinged to both ends of the bottom frame mounting member 23, so that the leg extension member 22 and the backrest extension member 24 cooperate with each other to enable the extension assembly 20 to have a sitting position and a lying position. The footrest member 21 is located at one end of the leg extension member 22 away from the backrest extension member 24. When the extension assembly 20 is in the lying position, the difference between the highest point of the footrest member 21 and the highest point of the backrest extension member 24 is greater than a predetermined height difference h.

[0048] The seat stretching device provided in this embodiment not only has a zero-gravity function, that is, when the stretching assembly 20 is in a lying position, there is a certain height difference between the footrest 21 and the backrest stretching member 24, so that the user's feet are higher than the user's heart position, thus forming a zero-gravity experience, but also has a swinging function, that is, when needed by the user, the stretching assembly 20 can be driven to swing by the swinging assembly 10, thereby greatly improving the user's experience. It can be seen that the seat stretching device provided in this embodiment has both a zero-gravity function and a swinging function, can meet different usage requirements of users, and thus can solve the problem of the relatively single function of the electric seat in the prior art.

[0049] Specifically, the support base 100 includes a first support portion and a second support portion. There are two swinging assemblies 10 and two stretching assemblies 20. The two swinging assemblies 10 and the two stretching assemblies 20 are respectively arranged on the first support portion and the second support portion, and move synchronously through a connecting rod. The first support portion and the second support portion are connected by at least two connecting rods. The first support portion, the second support portion, and the at least two connecting rods form a rectangular space for placing the support bottom plate.

[0050] Specifically, the leg stretching member 22 can be contracted or extended. The footrest 21 is hinged to the leg stretching member 22 and drives the footrest 21 to rotate when the leg stretching member 22 contracts or extends. When the stretching assembly 20 is in the sitting position, the leg stretching member 22 contracts and drives the footrest 21 to be retracted below the bottom frame mounting member 23; during the process of the stretching assembly 20 switching to the lying position, while the backrest stretching member 24 tilts backward, the leg stretching member 22 extends to the front of the bottom frame mounting member 23.

[0051] In this embodiment, the value range of the predetermined height difference h is 200mm ≤ h ≤ 400mm. When h is within this range, the user's feet and legs can be higher than the chest, thereby further improving the user's zero-gravity experience. Specifically, h can be 253mm.

[0052] In this embodiment, the swinging assembly 10 includes a swinging member 11, a first swinging arm 12, and a second swinging arm 13. The first ends of the first swinging arm 12 and the second swinging arm 13 are respectively rotatably connected to the support base 100, and the second ends of the first swinging arm 12 and the second swinging arm 13 are respectively rotatably connected to the swinging member 11 to drive the swinging member 11 to swing. In this way, the swinging member 11 can be driven to swing by the swinging of the first swinging arm 12 and the second swinging arm 13, thereby driving the stretching assembly 20 to swing. Thus, the seat stretching device can realize its swinging function through a simple structure.

[0053] In this embodiment, a first connecting rod 101 is arranged between two leg stretching members 22, and a second connecting rod 102 is arranged between two swinging members 11. The seat stretching device further includes a driving assembly 50, and the driving assembly 50 includes a driving member 51, a driving rod 52 and a guiding member 53. The driving member 51 is hinged to the first connecting rod 101, the guiding member 53 is hinged to the second connecting rod 102, the driving rod 52 can slide along the guiding member 53, and the driving rod 52 is drivingly connected to the driving member 51 to move along the guiding member 53 under the drive of the driving member 51, so as to control the extension or contraction of the leg stretching members 22. Specifically, when the driving rod 52 drives the first connecting rod 101 to move away from the second connecting rod 102, the leg stretching members 22 extend; when the driving rod 52 drives the first connecting rod 101 to move closer to the second connecting rod 102, the leg stretching members 22 contract.

[0054] Specifically, the first connecting rod 101 is fixedly connected between two leg stretching members 22, the second connecting rod 102 is fixedly connected between two swinging members 11, and the driving assembly 50 is a slider motor driving device; in other embodiments, the driving assembly 50 can be a push rod motor driving device.

[0055] In this embodiment, a first limiting portion 121 is arranged on the first swinging arm 12, and a first limiting cooperation portion 111 and a second limiting cooperation portion 112 which are in limiting cooperation with the first limiting portion 121 are arranged on the swinging member 11 to limit the swing of the swinging member 11 between the first limiting cooperation portion 111 and the second limiting cooperation portion 112. In this way, during the swinging of the first swinging arm 12, the first limiting portion 121 swings along with the first swinging arm 12. When it swings to the position where the first limiting cooperation portion 111 or the second limiting cooperation portion 112 is located, its swing will be restricted, so as to prevent the seat stretching device from causing the user to fall due to excessive swing amplitude, thereby ensuring the safety of the user during the use of the seat stretching device.

[0056] In this embodiment, the first limiting portion 121 is a limiting protrusion, and both the first limiting cooperation portion 111 and the second limiting cooperation portion 112 are limiting grooves. In this way, the limitation of the swing can be cleverly realized through a simple structure, and the production cost of the seat stretching device can be reduced, and the production efficiency of the seat stretching device can be improved.

[0057] Specifically, the first limiting portion 121 can be a limiting post or a limiting pin, and no more restrictions will be made here.

[0058] In this embodiment, the first limiting and mating part 111 and the second limiting and mating part 112 are spaced apart by a first preset distance, so that the maximum swing angle of the first swing arm 12 is a, where 67° ≤ a ≤ 71°. At this time, the maximum swing angle of the second swing arm 13 is b, where 72° ≤ b ≤ 76°. Limiting a and b within this range can not only ensure that the swing member 11 has a sufficient swing amplitude to guarantee the user's swinging experience, but also prevent the swing amplitude of the swing member 11 from being too large, which may affect the safety of the user. Moreover, since the positions of the first swing arm 12 and the second swing arm 13 are different, their swing amplitudes during the swinging process are also different. Setting a and b to different values can meet the structural requirements of the seat extension device.

[0059] Preferably, a = 69° and b = 74°.

[0060] In this embodiment, the seat extension device further includes a swing limiting member 30. The leg extension member 22 is connected to the swing limiting member 30 to drive the swing limiting member 30 to move. The swing limiting member 30 includes a fifth limiting and mating part 321 for limiting and mating with the first limiting part 121 to limit the swing of the first swing arm 12 when the leg extension member 22 extends to the lying position. In this way, when the leg extension member 22 extends to the lying position, the extension assembly 20 cannot swing, thereby preventing the user from falling due to the swing of the extension assembly 20 when in the lying position, thus ensuring the safety of the seat extension device during use.

[0061] In this embodiment, the swing limiting member 30 includes a transmission rod 31 and a limiting plate 32. The limiting plate 32 is fixedly connected to the transmission rod 31 relatively. The leg extension member 22 is connected to the transmission rod 31 to drive the transmission rod 31 to move. Specifically, the first limiting part 121 is a limiting protrusion, the fifth limiting and mating part 321 is a limiting groove and the fifth limiting and mating part 321 is arranged on the limiting plate 32. The limiting plate 32 also has a first guiding surface 322 and a second guiding surface 323. The first guiding surface 322 and the second guiding surface 323 extend outward along the directions on both sides of the fifth limiting and mating part 321 respectively to guide the movement of the first limiting part 121 in different directions when the transmission rod 31 moves.

[0062] With such a setting, when the leg extension member 22 extends or contracts, the transmission rod 31 can drive the limit plate 32 to move, so that the first limit portion 121 and the fifth limit cooperation portion 321 move relative to each other to the position where they are in limit cooperation or the non-limited position, that is, the swing can be restricted or the restriction can be cancelled as the extension assembly 20 moves. Moreover, when the first limit portion 121 moves, the first guide surface 322 and the second guide surface 323 can guide the movement of the first limit portion 121 to ensure that the first limit portion 121 can enter or leave the fifth limit cooperation portion 321. Specifically, in at least part of the process when the first limit portion 121 moves to the position where it cooperates with the fifth limit cooperation portion 321, the first limit portion 121 enters the fifth limit cooperation portion 321 along the first guide surface 322; in at least part of the process when the first limit portion 121 moves away from the position where it is in limit cooperation with the fifth limit cooperation portion 321, the first limit portion 121 leaves the fifth limit cooperation portion 321 along the second guide surface 323.

[0063] In this embodiment, the seat extension device further includes a transmission rod 31, and the leg extension member 22 is connected to the transmission rod 31 to drive the transmission rod 31 to move. The seat extension device further includes a backrest transmission assembly 40. The backrest transmission assembly 40 includes a first drive rod 41, a second drive rod 42, and a third drive rod 43. The first drive rod 41 is respectively hinged to the backrest extension member 24 and the transmission rod 31 to drive the backrest extension member 24 to move when the leg extension member 22 moves. The first end of the second drive rod 42 and the third drive rod 43 are hinged to each other. The other end of the second drive rod 42 is hinged to the bottom frame mounting member 23. The third drive rod 43 is hinged to the swing assembly 10. Specifically, the third drive rod 43 is hinged to the swing member 11. In this way, when the leg extension member 22 extends, the backrest extension member 24 can be driven to move simultaneously through the transmission rod 31 and the first drive rod 41 to synchronously change the extension direction of the backrest extension member 24 to meet the usage requirements in different positions. Moreover, during the movement of the backrest extension member 24, the bottom frame mounting member 23 moves synchronously, and the stability of the movement of the bottom frame mounting member 23 is improved by arranging the second drive rod 42 and the third drive rod 43.

[0064] Specifically, the part of the bottom frame mounting member 23 close to the backrest extension member 24 is for the user to lean on.

[0065] In this embodiment, the bottom frame mounting component 23 is used to mount the seat cushion. When the stretching component 20 is in the lying position, the angle between the bottom surface of the seat cushion and the horizontal plane is c, where 15° ≤ c ≤ 45°; the angle between the extending direction of the backrest stretching component 24 and the bottom surface of the seat cushion is d, where 122° ≤ d ≤ 148°; the footrest 21 is in a plate-like structure and the angle between the extending direction of the footrest 21 and the horizontal plane is e, where 4° ≤ e ≤ 20°. With such dimensional settings, it can be ensured that when the stretching component 20 is in the lying position, the user's legs are at least higher than their chest, thereby further improving the user's comfort level.

[0066] Specifically, c = 22°, d = 136°, and e = 6°.

[0067] Specifically, when the stretching component 20 is in the sitting position, the angle between the extending direction of the backrest stretching component 24 and the bottom surface of the seat cushion is between 100° and 120°. Preferably, d = 111°.

[0068] Embodiment 2 of the present utility model also provides a seat stretching device. Different from the seat stretching device in Embodiment 1 above, the first swing arm 12 of the seat stretching device in this embodiment is not provided with a first limiting portion 121, nor are there other components adapted to the first limiting portion 121.

[0069] In this embodiment, a second limiting portion is provided on the second swing arm 13, and a third limiting and cooperating portion and a fourth limiting and cooperating portion for limiting cooperation with the second limiting portion are provided on the swinging member 11, so as to limit the swing of the swinging member 11 between the third limiting and cooperating portion and the fourth limiting and cooperating portion.

[0070] In this embodiment, the second limiting portion is a limiting protrusion, and both the third limiting and cooperating portion and the fourth limiting and cooperating portion are limiting grooves.

[0071] In this embodiment, the third limiting and cooperating portion and the fourth limiting and cooperating portion are spaced apart by a second preset distance, so that the maximum swing angle of the second swing arm 13 is b, where 72° ≤ b ≤ 76°.

[0072] In this embodiment, the swing limiting member 30 further includes a sixth limiting and cooperating portion for limiting cooperation with the second limiting portion, so as to limit the swing of the second swing arm 13 when the leg stretching component 22 extends to the lying position.

[0073] In this embodiment, the sixth limiting and cooperating portion is a limiting groove, the sixth limiting and cooperating portion is provided on the limiting plate 32, and the limiting plate 32 further has a third guiding surface and a fourth guiding surface, and the third guiding surface and the fourth guiding surface extend outward along the directions on both sides of the sixth limiting and cooperating portion respectively, so as to guide the movement of the second limiting portion in different directions when the transmission rod 31 moves.

[0074] Embodiment 3 of the present utility model also provides a seat stretching device. Different from the seat stretching devices in Embodiment 1 and Embodiment 2 above, a first limiting portion 121 is provided on the first swing arm 12 of the seat stretching device in this embodiment, a second limiting portion is provided on the second swing arm 13, and other components adapted to the first limiting portion 121 and the second limiting portion are provided. By simultaneously limiting the swing of the seat stretching device through the first limiting portion 121 and the second limiting portion, the stability of the limit can be further improved.

[0075] Embodiment 4 of the present utility model provides an electric rocking chair, including any one of the seat stretching devices in Embodiments 1, 2, and 3 above.

[0076] From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects: The seat stretching device simultaneously has a zero-gravity function and a swing function, can meet different usage needs of users, and thus can greatly improve the user experience. Moreover, the leg stretching component and the backrest stretching component can be linked with each other and operate smoothly. In addition, the structure of the seat stretching device is simple and it is also convenient to install the electric rocking chair.

[0077] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or their combinations.

[0078] Unless otherwise specifically stated, the relative arrangements of the components and steps set forth in these embodiments, numerical expressions, and numerical values do not limit the scope of the present application. At the same time, it should be understood that, for the sake of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: Similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0079] In the description of the present application, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, top, bottom, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0080] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation other than the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0081] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional statement, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present application.

[0082] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A seat extension device, characterized in that, Comprising: A support base (100); A swing assembly (10), which is swingably mounted on the support base (100); An extension assembly (20), the extension assembly (20) includes a bottom frame mounting member (23), a footrest member (21), a leg extension member (22) and a backrest extension member (24), the bottom frame mounting member (23) is rotatably mounted on the swing assembly (10), the leg extension member (22) and the backrest extension member (24) are respectively hinged to both ends of the bottom frame mounting member (23), so that the leg extension member (22) and the backrest extension member (24) cooperate with each other to enable the extension assembly (20) to have a sitting position and a lying position; the footrest member (21) is located at one end of the leg extension member (22) away from the backrest extension member (24); Wherein, when the extension assembly (20) is in the lying position, the difference between the highest point of the footrest member (21) and the highest point of the backrest extension member (24) is greater than a predetermined height difference h.

2. The seat extension device according to claim 1, wherein The value range of the predetermined height difference h is 200mm ≤ h ≤ 400mm.

3. The seat extension device according to claim 1, characterized in that, The swing assembly includes a swing member (11), a first swing arm (12) and a second swing arm (13), the first end of the first swing arm (12) and the first end of the second swing arm (13) are respectively rotatably connected to the support base (100), the second end of the first swing arm (12) and the second end of the second swing arm (13) are respectively rotatably connected to the swing member (11) to drive the swing member (11) to swing.

4. The seat extension device according to claim 3, characterized in that A first limiting portion (121) is provided on the first swing arm (12), and a first limiting cooperation portion (111) and a second limiting cooperation portion (112) which are in limiting cooperation with the first limiting portion (121) are provided on the swing member (11), so as to limit the swing of the swing member (11) between the first limiting cooperation portion (111) and the second limiting cooperation portion (112); and / or, A second limiting portion is provided on the second swing arm (13), and a third limiting cooperation portion and a fourth limiting cooperation portion which are in limiting cooperation with the second limiting portion are provided on the swing member (11), so as to limit the swing of the swing member (11) between the third limiting cooperation portion and the fourth limiting cooperation portion.

5. The seat extension device according to claim 4, characterized in that When a first limiting portion (121) is provided on the first swing arm (12), the first limiting portion (121) is a limiting protrusion, and both the first limiting cooperation portion (111) and the second limiting cooperation portion (112) are limiting grooves; and / or, When a second limiting portion is provided on the second swing arm (13), the second limiting portion is a limiting protrusion, and both the third limiting cooperation portion and the fourth limiting cooperation portion are limiting grooves.

6. The seat extension device according to claim 4, characterized in that When a first limiting part (121) is provided on the first swing arm (12), the first limiting and mating part (111) and the second limiting and mating part (112) are spaced apart by a first preset distance, so that the maximum swing angle of the first swing arm (12) is a, 67° ≤ a ≤ 71°; and / or, When a second limiting part is provided on the second swing arm (13), the third limiting and mating part and the fourth limiting and mating part are spaced apart by a second preset distance, so that the maximum swing angle of the second swing arm (13) is b, 72° ≤ b ≤ 76°.

7. The seat extension device according to claim 3, characterized in that, The seat extension device further includes a swing limiting member (30), and the leg extension member (22) is connected to the swing limiting member (30) to drive the swing limiting member (30) to move; Wherein, a first limiting part (121) is provided on the first swing arm (12), and the swing limiting member (30) includes a fifth limiting and mating part (321) for limiting and mating with the first limiting part (121) to limit the swing of the first swing arm (12) when the leg extension member (22) extends to the lying position; and / or, A second limiting part is provided on the second swing arm (13), and the swing limiting member (30) includes a sixth limiting and mating part for limiting and mating with the second limiting part to limit the swing of the second swing arm (13) when the leg extension member (22) extends to the lying position.

8. The seat extension device according to claim 7, wherein The swing limiting member (30) includes a transmission rod (31) and a limiting plate (32), the limiting plate (32) is fixedly connected to the transmission rod (31) relatively, and the leg extension member (22) is connected to the transmission rod (31) to drive the transmission rod (31) to move; Wherein, when a first limiting part (121) is provided on the first swing arm (12), the first limiting part (121) is a limiting protrusion, the fifth limiting and mating part (321) is a limiting groove, the fifth limiting and mating part (321) is provided on the limiting plate (32), and the limiting plate (32) further has a first guiding surface (322) and a second guiding surface (323), the first guiding surface (322) and the second guiding surface (323) extend outward along the directions on both sides of the fifth limiting and mating part (321) respectively to guide the movement of the first limiting part (121) in different directions when the transmission rod (31) moves; and / or, When a second limiting part is provided on the second swing arm (13), the second limiting part is a limiting protrusion, the sixth limiting and mating part is a limiting groove, the sixth limiting and mating part is provided on the limiting plate (32), and the limiting plate (32) further has a third guiding surface and a fourth guiding surface, the third guiding surface and the fourth guiding surface extend outward along the directions on both sides of the sixth limiting and mating part respectively to guide the movement of the second limiting part in different directions when the transmission rod (31) moves.

9. The seat extension device according to claim 1, wherein The seat extension device further includes a transmission rod (31), and the leg extension member (22) is connected to the transmission rod (31) to drive the transmission rod (31) to move; the seat extension device further includes a backrest transmission assembly (40), and the backrest transmission assembly (40) includes a first driving rod (41), a second driving rod (42) and a third driving rod (43); Wherein, the first driving rod (41) is respectively hinged to the backrest extension member (24) and the transmission rod (31) to drive the backrest extension member (24) to move when the leg extension member (22) moves. The first end of the second driving rod (42) and the third driving rod (43) are hinged to each other. The other end of the second driving rod (42) is hinged to the bottom frame mounting member (23), and the third driving rod (43) is hinged to the swing assembly (10).

10. The seat extension device according to any one of claims 1 to 9, characterized in that, The bottom frame mounting member (23) is used for mounting a seat cushion. When the extension assembly (20) is in the lying position, the included angle between the bottom surface of the seat cushion and the horizontal plane is c, and 15° ≤ c ≤ 45°; and / or, the included angle between the extending direction of the backrest extension member (24) and the bottom surface of the seat cushion is d, and 122° ≤ d ≤ 148°; and / or, the footrest member (21) is in a plate-like structure, and the included angle between the extending direction of the footrest member (21) and the horizontal plane is e, and 4° ≤ e ≤ 20°.

11. An electric rocking chair, characterized in that, Comprising the seat extension device according to any one of claims 1 to 10.

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