Seat extension device and electric swing chair comprising same

Abstract

The present application provides a seat extension device and an electric swing chair comprising same. The seat extension device comprises: a support base; a swing assembly, wherein the swing assembly is swingably mounted on the support base; and an extension assembly, wherein the extension assembly comprises a base frame mounting component, a footrest component, a leg extension component, and a backrest extension component. The base frame mounting component is rotatably mounted on the swing assembly, and the leg extension component and the backrest extension component are hingedly connected to two ends of the base frame mounting component, respectively, so that the leg extension component and the backrest extension component can cooperate with each other to allow the extension assembly to assume a sitting position and a reclining position. The footrest component is located at the end of the leg extension component distant from the backrest extension component. When the extension assembly is in the reclining position, the difference between the highest point of the footrest component and the highest point of the backrest extension component is greater than a predetermined height difference h. By means of the technical solution of the present application, the problem in the prior art of limited functionality of existing electric seats can be solved.

Description

Seat stretching device and electric rocking chair with same

[0001] The present application claims priority to the Chinese patent application No. 202421810706.X, filed on July 29, 2024, and entitled "Seat stretching device and electric rocking chair with same". TECHNICAL FIELD

[0002] The present application relates to the technical field of seat mechanism, in particular to a seat stretching device and an electric rocking chair with the same. BACKGROUND

[0003] At present, with the continuous improvement of the living standards of users, users have more pursuits for the comfort of sofas. When choosing electric sofas, users have not been limited to single functions.

[0004] However, most of the electric sofas on the market only have zero-gravity function, which cannot fully meet the use requirements of users.

[0005] CONTENT OF THE UTILITY MODEL

[0006] The main purpose of the present application is to provide a seat stretching device and an electric rocking chair with the same, so as to solve the problem of single function of the electric seat in the prior art.

[0007] In order to achieve the above purpose, in some embodiments, according to one aspect of the present application, a seat stretching device is provided, comprising:

[0008] a support seat;

[0009] a rocking assembly, which is swingably installed on the support seat;

[0010] a stretching assembly, which comprises a bottom frame mounting part, a foot rest, a leg stretching part and a backrest stretching part, the bottom frame mounting part is rotatably installed on the rocking assembly, the leg stretching part and the backrest stretching part are respectively hinged to two ends of the bottom frame mounting part, so that the leg stretching part and the backrest stretching part cooperate with each other to make the stretching assembly have a sitting position and a lying position; the foot rest is located at one end of the leg stretching part away from the backrest stretching part;

[0011] wherein, when the stretching assembly is in the lying position, the height difference between the highest point of the foot rest and the highest point of the backrest stretching part is greater than a predetermined height difference h.

[0012] In some embodiments, the value range of the predetermined height difference h is 200mm≤h≤400mm.

[0013] In some embodiments, the swinging assembly comprises a swinging piece, a first swinging arm and a second swinging arm, the first end of the first swinging arm and the first end of the second swinging arm are respectively rotationally connected with the support base, the second end of the first swinging arm and the second end of the second swinging arm are respectively rotationally connected with the swinging piece to drive the swinging piece to swing.

[0014] In some embodiments, the first swinging arm is provided with a first limiting part, the swinging piece is provided with a first limiting cooperation part and a second limiting cooperation part which are limited to cooperate with the first limiting part, so as to limit the swing of the swinging piece between the first limiting cooperation part and the second limiting cooperation part; or,

[0015] The second swinging arm is provided with a second limiting part, and the swinging piece is provided with a third limiting cooperation part and a fourth limiting cooperation part which are limited to cooperate with the second limiting part, so as to limit the swing of the swinging piece between the third limiting cooperation part and the fourth limiting cooperation part; or,

[0016] The first swinging arm is provided with a first limiting part, and the swinging piece is provided with a first limiting cooperation part and a second limiting cooperation part which are limited to cooperate with the first limiting part, so as to limit the swing of the swinging piece between the first limiting cooperation part and the second limiting cooperation part; the second swinging arm is provided with a second limiting part, and the swinging piece is provided with a third limiting cooperation part and a fourth limiting cooperation part which are limited to cooperate with the second limiting part, so as to limit the swing of the swinging piece between the third limiting cooperation part and the fourth limiting cooperation part.

[0017] In some embodiments, when the first swinging arm is provided with a first limiting part, the first limiting part is a limiting protrusion, and the first limiting cooperation part and the second limiting cooperation part are limiting grooves; or,

[0018] When the second swinging arm is provided with a second limiting part, the second limiting part is a limiting protrusion, and the third limiting cooperation part and the fourth limiting cooperation part are limiting grooves; or,

[0019] When the first swinging arm is provided with a first limiting part, the first limiting part is a limiting protrusion, and the first limiting cooperation part and the second limiting cooperation part are limiting grooves; when the second swinging arm is provided with a second limiting part, the second limiting part is a limiting protrusion, and the third limiting cooperation part and the fourth limiting cooperation part are limiting grooves.

[0020] In some embodiments, when the first swinging arm is provided with a first limiting part, the first limiting cooperation part and the second limiting cooperation part are separated by a first preset distance, so that the maximum swing angle of the first swinging arm is a, 67°≤a≤71°; or,

[0021] When the second swinging arm is provided with a second limiting part, the third limiting cooperation part and the fourth limiting cooperation part are separated by a second preset distance, so that the maximum swing angle of the second swinging arm is b, 72°≤b≤76°; or,

[0022] When the first swing arm is provided with the first limiting part, the first limiting fitting part and the second limiting fitting part are spaced apart by a first preset distance, so that the maximum swing angle of the first swing arm is a, 67°≤a≤71°; when the second swing arm is provided with the second limiting part, the third limiting fitting part and the fourth limiting fitting part are spaced apart by a second preset distance, so that the maximum swing angle of the second swing arm is b, 72°≤b≤76°.

[0023] In some embodiments, the seat stretching device further comprises a swing limiting piece, and the leg stretching component is connected with the swing limiting piece to drive the swing limiting piece to move.

[0024] The first swing arm is provided with a first limiting part, and the swing limiting piece comprises a fifth limiting fitting part for limiting cooperation with the first limiting part to limit the swing of the first swing arm when the leg stretching component is stretched to the lying position; or,

[0025] The second swing arm is provided with a second limiting part, and the swing limiting piece comprises a sixth limiting fitting part for limiting cooperation with the second limiting part to limit the swing of the second swing arm when the leg stretching component is stretched to the lying position; or,

[0026] The first swing arm is provided with a first limiting part, and the swing limiting piece comprises a fifth limiting fitting part for limiting cooperation with the first limiting part to limit the swing of the first swing arm when the leg stretching component is stretched to the lying position; the second swing arm is provided with a second limiting part, and the swing limiting piece comprises a sixth limiting fitting part for limiting cooperation with the second limiting part to limit the swing of the second swing arm when the leg stretching component is stretched to the lying position.

[0027] In some embodiments, the swing limiting piece comprises a transmission rod and a limiting plate, the limiting plate is opposite to and fixedly connected with the transmission rod, and the leg stretching component is connected with the transmission rod to drive the transmission rod to move.

[0028] When the first swing arm is provided with the first limiting part, the first limiting part is a limiting protrusion, the fifth limiting fitting part is a limiting groove, the fifth limiting fitting part is arranged on the limiting plate, the limiting plate further has a first guide surface and a second guide surface, the first guide surface and the second guide surface respectively extend outward along the directions of the two sides of the fifth limiting fitting part to guide the movement of the first limiting part in different directions when the transmission rod moves; or,

[0029] When the second limiting part is arranged on the second swing arm, the second limiting part is a limiting protrusion, the sixth limiting matching part is a limiting groove, the sixth limiting matching part is arranged on the limiting plate, the limiting plate further has a third guide surface and a fourth guide surface, the third guide surface and the fourth guide surface respectively extend outward along the directions of the two sides of the sixth limiting matching part, so as to guide the movement of the second limiting part in different directions when the transmission rod moves; or,

[0030] When the first limiting part is arranged on the first swing arm, the first limiting part is a limiting protrusion, the fifth limiting matching part is a limiting groove, the fifth limiting matching part is arranged on the limiting plate, the limiting plate further has a first guide surface and a second guide surface, the first guide surface and the second guide surface respectively extend outward along the directions of the two sides of the fifth limiting matching part, so as to guide the movement of the first limiting part in different directions when the transmission rod moves; when the second limiting part is arranged on the second swing arm, the second limiting part is a limiting protrusion, the sixth limiting matching part is a limiting groove, the sixth limiting matching part is arranged on the limiting plate, the limiting plate further has a third guide surface and a fourth guide surface, the third guide surface and the fourth guide surface respectively extend outward along the directions of the two sides of the sixth limiting matching part, so as to guide the movement of the second limiting part in different directions when the transmission rod moves.

[0031] In some embodiments, the seat stretching device further comprises a transmission rod, the leg stretching component is connected with the transmission rod to drive the transmission rod to move; the seat stretching device further comprises a backrest transmission assembly, the backrest transmission assembly comprises a first driving rod, a second driving rod and a third driving rod;

[0032] The first driving rod is hingedly connected with the backrest stretching component and the transmission rod respectively 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 hingedly connected with each other, the other end of the second driving rod is hingedly connected with the bottom frame mounting component, and the third driving rod is hingedly connected with the swing assembly.

[0033] In some embodiments, the bottom frame mounting component is used for mounting the seat cushion, when the stretching assembly is in the lying position,

[0034] The included angle between the bottom surface of the seat cushion and the horizontal plane is c, and 15°≤c≤45°; or,

[0035] The included angle between the extension direction of the backrest stretching component and the bottom surface of the seat cushion is d, and 122°≤d≤148°; or,

[0036] The footrest is a plate-shaped structure, the included angle between the extension direction of the footrest and the horizontal plane is e, and 4°≤e≤20°; or,

[0037] An angle between the bottom surface of the cushion and a horizontal plane is c, 15°≤c≤45°; an angle between the extension direction of the backrest extension component and the bottom surface of the cushion is d, 122°≤d≤148°; or,

[0038] An angle between the bottom surface of the cushion and a horizontal plane is c, 15°≤c≤45°; the footrest is a plate-shaped structure, an angle between the extension direction of the footrest and the horizontal plane is e, 4°≤e≤20°; or,

[0039] An angle between the extension direction of the backrest extension component and the bottom surface of the cushion is d, 122°≤d≤148°; the footrest is a plate-shaped structure, an angle between the extension direction of the footrest and the horizontal plane is e, 4°≤e≤20°; or,

[0040] An angle between the bottom surface of the cushion and a horizontal plane is c, 15°≤c≤45°; an angle between the extension direction of the backrest extension component and the bottom surface of the cushion is d, 122°≤d≤148°; the footrest is a plate-shaped structure, an angle between the extension direction of the footrest and the horizontal plane is e, 4°≤e≤20°.

[0041] In some embodiments, according to another aspect of the present application, there is provided an electrically-powered rocking chair comprising the above-mentioned seat extension device.

[0042] By applying the technical solution of the present application, not only does the zero-gravity function, i.e., a certain height difference between the footrest and the backrest extension component when the extension assembly is in a lying position, is provided to make the user's feet higher than the user's heart, thereby forming a zero-gravity experience, but also a rocking function, i.e., the extension assembly can be rocked by the rocking assembly when the user needs it, thereby greatly improving the user's experience. As can be seen, the seat extension device of the present application simultaneously has the zero-gravity function and the rocking function, and can meet different use requirements of the user, thereby solving the problem of single function of the electrically-powered seat in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0043] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification of the present application explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0044] Fig. 1 shows a partial structure schematic view of a seat extension device provided according to an embodiment of the present application in a sitting position from one perspective;

[0045] Fig. 2 shows a structure schematic view of a seat extension device provided according to an embodiment of the present application in a sitting position from another perspective;

[0046] Fig. 3 shows a partial structural schematic view of the seat stretching device in a lying position from one perspective according to an embodiment of the present application;

[0047] Fig. 4 shows a structural schematic view of the seat stretching device in a lying position from another perspective according to an embodiment of the present application;

[0048] Fig. 5 shows a swinging schematic view of a first swinging arm of the seat stretching device according to an embodiment of the present application;

[0049] Fig. 6 shows a swinging schematic view of a second swinging arm of the seat stretching device according to an embodiment of the present application.

[0050] Wherein, the above-mentioned figures include the following reference signs: 100, support seat; 101, first connecting rod; 102, second connecting rod; 10, swinging assembly; 11, swinging piece; 111, first limiting cooperation part; 112, second limiting cooperation part; 12, first swinging arm; 121, first limiting part; 13, second swinging arm; 20, stretching assembly; 21, foot rest piece; 22, leg stretching part; 23, bottom frame mounting part; 24, backrest stretching part; 30, swinging limiting piece; 31, transmission rod; 32, limiting plate; 321, fifth limiting cooperation part; 322, first guide surface; 323, second guide surface; 40, backrest transmission assembly; 41, first driving rod; 42, second driving rod; 43, third driving rod; 50, driving assembly; 51, driving piece; 52, driving rod; 53, guide piece. DETAILED DESCRIPTION

[0051] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0052] As shown in Figs. 1 to 6, some embodiments of the present application provide a seat stretching device, which comprises a support seat 100, a swinging assembly 10 and a stretching assembly 20. The swinging assembly 10 is swingably installed on the support seat 100. The stretching assembly 20 comprises a bottom frame mounting part 23, a foot rest piece 21, a leg stretching part 22 and a backrest stretching part 24. The bottom frame mounting part 23 is rotatably installed on the swinging assembly 10. The leg stretching part 22 and the backrest stretching part 24 are respectively hinged to two ends of the bottom frame mounting part 23, so that the leg stretching part 22 and the backrest stretching part 24 cooperate with each other to make the stretching assembly 20 have a sitting position and a lying position. The foot rest piece 21 is located at an end of the leg stretching part 22 away from the backrest stretching part 24. When the stretching assembly 20 is in the lying position, the height difference between the highest point of the foot rest piece 21 and the highest point of the backrest stretching part 24 is greater than a predetermined height difference h.

[0053] The seat stretching device provided by the embodiment not only has a zero-gravity function, that is, a certain height difference between the foot rest 21 and the backrest stretching part 24 when the stretching assembly 20 is in a lying position, so that the user's feet are higher than the user's heart, thereby forming a zero-gravity experience, but also has a swinging function, that is, the stretching assembly 20 can be swung by the swinging assembly 10 when the user needs, thereby greatly improving the user's experience. As can be seen, the seat stretching device provided by the embodiment has both zero-gravity function and swinging function, and can meet different use requirements of users, thereby solving the problem of single function of the electric seat in the prior art.

[0054] In some embodiments, the support seat 100 includes a first support part and a second support part, and the swinging assembly 10 and the stretching assembly 20 are both two, and the two swinging assemblies 10 and the two stretching assemblies 20 are respectively arranged on the first support part and the second support part and synchronously move through the connecting rods. The first support part and the second support part are connected through at least two connecting rods, and the first support part, the second support part and the at least two connecting rods form a rectangular space for placing the support bottom plate.

[0055] In some embodiments, the leg stretching part 22 can be retracted or stretched, the foot rest 21 is hinged to the leg stretching part 22 and rotates when the leg stretching part 22 is retracted or stretched, and when the stretching assembly 20 is in a sitting position, the leg stretching part 22 is retracted and the foot rest 21 is retracted below the bottom frame mounting part 23; in the process of switching the stretching assembly 20 to a lying position, the leg stretching part 22 is stretched to the front of the bottom frame mounting part 23 while the backrest stretching part 24 is inclined backward.

[0056] In some embodiments, the predetermined height difference h is in the range of 200mm≤h≤400mm. When h is in this range, the user's feet and legs are higher than the chest, thereby further improving the user's zero-gravity experience. In some embodiments, h is 253mm.

[0057] In some embodiments, the swinging assembly 10 includes a swinging part 11, a first swinging arm 12 and a second swinging arm 13, the first end of the first swinging arm 12 and the first end of the second swinging arm 13 are respectively rotatably connected to the support seat 100, and the second end of the first swinging arm 12 and the second end of the second swinging arm 13 are respectively rotatably connected to the swinging part 11 to drive the swinging part 11 to swing. In this way, the swinging part 11 can be swung by the swinging of the first swinging arm 12 and the second swinging arm 13, thereby driving the stretching assembly 20 to swing. Therefore, the seat stretching device can realize its swinging function through a simple structure.

[0058] In some embodiments, a first connecting rod 101 is arranged between the two leg stretching components 22, and a second connecting rod 102 is arranged between the two swing members 11. The seat stretching device further comprises a driving assembly 50, which comprises a driving member 51, a driving rod 52 and a guide member 53. The driving member 51 is hingedly connected to the first connecting rod 101, the guide member 53 is hingedly connected to the second connecting rod 102, and the driving rod 52 is slidable along the guide member 53. The driving rod 52 is drivingly connected to the driving member 51, so as to be movable along the guide member 53 under the driving of the driving member 51, thereby controlling the stretching or contraction of the leg stretching components 22. In some embodiments, when the driving rod 52 drives the first connecting rod 101 to move away from the second connecting rod 102, the leg stretching components 22 are stretched; when the driving rod 52 drives the first connecting rod 101 to move towards the second connecting rod 102, the leg stretching components 22 are contracted.

[0059] In some embodiments, the first connecting rod 101 is fixedly connected between the two leg stretching components 22, the second connecting rod 102 is fixedly connected between the two swing 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.

[0060] In some embodiments, the first swing arm 12 is provided with a first limiting portion 121, and the swing member 11 is provided with a first limiting cooperation portion 111 and a second limiting cooperation portion 112 which are in limiting cooperation with the first limiting portion 121, 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. In this way, during the swing of the first swing arm 12, the first limiting portion 121 swings with the first swing arm 12, and when the first swing arm 12 swings to the position of the first limiting cooperation portion 111 or the second limiting cooperation portion 112, the swing is limited, thereby preventing the user from falling due to the excessive swing of the seat stretching device, and ensuring the safety of the user during the use of the seat stretching device.

[0061] In some embodiments, the first limiting portion 121 is a limiting protrusion, and the first limiting cooperation portion 111 and the second limiting cooperation portion 112 are limiting grooves. In this way, the swing can be limited by 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.

[0062] In some embodiments, the first limiting portion 121 can be a limiting column or a limiting pin, which is not limited here.

[0063] In some embodiments, the first limiting fitting part 111 and the second limiting fitting 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°. At this time, the maximum swing angle of the second swing arm 13 is b, 72°≤b≤76°. By limiting a and b within this range, it can not only ensure that the swing piece 11 has sufficient swing amplitude to ensure the swing experience of the user, but also prevent the swing amplitude of the swing piece 11 from being too large to 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 in the swing process are also different. By setting a and b to different values, the structural requirements of the seat stretching device can be met.

[0064] In some embodiments, a=69° and b=74°.

[0065] In some embodiments, the seat stretching device further comprises a swing limiting piece 30, and the leg stretching component 22 is connected with the swing limiting piece 30 to drive the swing limiting piece 30 to move. The swing limiting piece 30 comprises a fifth limiting fitting part 321 for limiting fitting with the first limiting part 121, so as to limit the swing of the first swing arm 12 when the leg stretching component 22 is stretched to the lying position. In this way, when the leg stretching component 22 is stretched to the lying position, the stretching assembly 20 cannot swing, thereby preventing the user from falling down due to the swing of the stretching assembly 20 when in the lying position, thereby ensuring the safety of the seat stretching device during use.

[0066] In some embodiments, the swing limiting piece 30 comprises a transmission rod 31 and a limiting plate 32, the limiting plate 32 is fixedly connected with the transmission rod 31 in opposition, and the leg stretching component 22 is connected with 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 fitting part 321 is a limiting groove, and the fifth limiting fitting part 321 is arranged on the limiting plate 32. The limiting plate 32 further has a first guide surface 322 and a second guide surface 323, which respectively extend outward along the directions of the two sides of the fifth limiting fitting part 321, so as to guide the movement of the first limiting part 121 in different directions when the transmission rod 31 moves.

[0067] With such an arrangement, when the leg stretching component 22 is stretched or retracted, the limiting plate 32 can be moved by the transmission rod 31, so that the first limiting portion 121 and the fifth limiting cooperating portion 321 move to a position where they are in limiting cooperation or a position where they are not in limiting cooperation, i.e., the swinging can be limited or cancelled according to the movement of the stretching assembly 20. Moreover, when the first limiting portion 121 moves, the first guide surface 322 and the second guide surface 323 can guide the movement of the first limiting portion 121, so as to ensure that the first limiting portion 121 can enter or exit the fifth limiting cooperating portion 321. In some embodiments, at least part of the time when the first limiting portion 121 moves to the position where it cooperates with the fifth limiting cooperating portion 321, the first limiting portion 121 enters the fifth limiting cooperating portion 321 along the first guide surface 322; at least part of the time when the first limiting portion 121 moves away from the position where it cooperates with the fifth limiting cooperating portion 321, the first limiting portion 121 exits the fifth limiting cooperating portion 321 along the second guide surface 323.

[0068] In some embodiments, the seat stretching device further comprises a transmission rod 31, and the leg stretching component 22 is connected to the transmission rod 31 to move the transmission rod 31. The seat stretching device further comprises a backrest transmission assembly 40, which comprises a first drive rod 41, a second drive rod 42, and a third drive rod 43. The first drive rod 41 is hingedly connected to the leg stretching component 22 and the transmission rod 31, respectively, to move the backrest stretching component 24 when the leg stretching component 22 moves. The second drive rod 42 is hingedly connected to the bottom frame mounting component 23 at one end, and the third drive rod 43 is hingedly connected to the second drive rod 42 at the other end. In some embodiments, the third drive rod 43 is hingedly connected to the swinging component 11. In this way, when the leg stretching component 22 is stretched, the backrest stretching component 24 can be moved simultaneously by the transmission rod 31 and the first drive rod 41, so as to change the extension direction of the backrest stretching component 24 synchronously, so as to meet the use requirements in different positions. Moreover, during the movement of the backrest stretching component 24, the bottom frame mounting component 23 moves synchronously, and the second drive rod 42 and the third drive rod 43 are arranged to improve the stability of the movement of the bottom frame mounting component 23.

[0069] In some embodiments, the part of the bottom frame mounting component 23 close to the backrest stretching component 24 is used for the user to lean against.

[0070] In some embodiments, the bottom frame mounting component 23 is used to mount a seat cushion, when the stretching assembly 20 is in the lying position, the included angle between the bottom surface of the seat cushion and the horizontal plane is c, 15°≤c≤45°; the included angle between the extension direction of the backrest stretching component 24 and the bottom surface of the seat cushion is d, 122°≤d≤148°; the footrest 21 is a plate structure and the included angle between the extension direction of the footrest 21 and the horizontal plane is e, 4°≤e≤20°. Through such size setting, it can be ensured that when the stretching assembly 20 is in the lying position, the user's legs are at least higher than his chest, thereby further improving the comfort of the user.

[0071] In some embodiments, c=22°, d=136°, and e=6°.

[0072] In some embodiments, when the stretching assembly 20 is in the sitting position, the included angle between the extension direction of the backrest stretching component 24 and the bottom surface of the seat cushion is between 100° and 120°. In some embodiments, d=111°.

[0073] Some embodiments of the present application also provide a seat stretching device, which is different from the seat stretching device in the above embodiments in that the first swing arm 12 in the seat stretching device of the some embodiments is not provided with a first limiting part 121, nor is it provided with other components matched with the first limiting part 121.

[0074] In some embodiments, the second swing arm 13 is provided with a second limiting part, and the swing piece 11 is provided with a third limiting cooperation part and a fourth limiting cooperation part matched with the second limiting part for limiting the swing of the swing piece 11 between the third limiting cooperation part and the fourth limiting cooperation part.

[0075] In some embodiments, the second limiting part is a limiting protrusion, and the third limiting cooperation part and the fourth limiting cooperation part are limiting grooves.

[0076] In some embodiments, the third limiting cooperation part and the fourth limiting cooperation part are separated by a second preset distance, so that the maximum swing angle of the second swing arm 13 is b, 72°≤b≤76°.

[0077] In some embodiments, the swing limiting piece 30 further comprises a sixth limiting cooperation part for limiting cooperation with the second limiting part, so as to limit the swing of the second swing arm 13 when the leg stretching component 22 is stretched to the lying position.

[0078] In some embodiments, the sixth limiting cooperation part is a limiting groove, and the sixth limiting cooperation part is arranged on the limiting plate 32. The limiting plate 32 further has a third guide surface and a fourth guide surface, which respectively extend outward along the directions of the two sides of the sixth limiting cooperation part, so as to guide the movement of the second limiting part in different directions when the transmission rod 31 moves.

[0079] Some embodiments of the present application provide a seat stretching device, which is different from the seat stretching device in the above embodiments in that the first swing arm 12 in the seat stretching device is provided with a first limiting part 121, the second swing arm 13 is provided with a second limiting part, and other components are provided which are matched with the first limiting part 121 and the second limiting part. By limiting the swing of the seat stretching device through the first limiting part 121 and the second limiting part at the same time, the stability of the limiting can be further improved.

[0080] Some embodiments of the present application provide an electrically-powered rocking chair, which comprises any one of the seat stretching devices in the above embodiments.

[0081] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects: the seat stretching device has both zero-gravity function and swing function, which can meet different use requirements of users, thereby greatly improving the use experience of users. In addition, the leg stretching part and the backrest stretching part can be linked with each other, and the operation is smooth. In addition, the structure of the seat stretching device is simple, and it is also relatively convenient when installing the electrically-powered rocking chair.

[0082] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0083] Unless specifically stated otherwise, the relative arrangements of the components and steps illustrated in these embodiments and the numerical expressions and values set forth herein are not limiting. It should be understood that the various parts shown in the drawings are not necessarily drawn to scale in proportion. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but should be considered as part of the specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0084] In the description of the present application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0085] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0086] In addition, it should be noted that the use of "first", "second" and the like words to define parts only facilitates the differentiation of corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0087] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A seat extension device, characterized in that, The seat stretching device comprises: a support base (100); a swing assembly (10) swingably mounted on the support base (100); a stretching assembly (20) comprising a bottom frame mounting part (23), a foot rest (21), a leg stretching part (22) and a back stretching part (24), the bottom frame mounting part (23) being rotatably mounted on the swing assembly (10), the leg stretching part (22) and the back stretching part (24) being respectively hinged to two ends of the bottom frame mounting part (23) to make the leg stretching part (22) and the back stretching part (24) cooperate to make the stretching assembly (20) have a sitting position and a lying position, the foot rest (21) being located at an end of the leg stretching part (22) away from the back stretching part (24); wherein, when the stretching assembly (20) is in the lying position, a height difference between a highest point of the foot rest (21) and a highest point of the back stretching part (24) is greater than a predetermined height difference h.

2. The seat extension device of claim 1, wherein, The predetermined height difference h is in a range of 200mm≤h≤400mm.

3. The seat extension device of claim 1, wherein, The swing assembly comprises a swing part (11), a first swing arm (12) and a second swing arm (13), a first end of the first swing arm (12) and a first end of the second swing arm (13) being respectively rotatably connected with the support base (100), a second end of the first swing arm (12) and a second end of the second swing arm (13) being respectively rotatably connected with the swing part (11) to drive the swing part (11) to swing.

4. The seat stretching device according to claim 3, wherein a first limiting part (121) is arranged on the first swing arm (12), and a first limiting cooperation part (111) and a second limiting cooperation part (112) are arranged on the swing part (11) to limit the swing of the swing part (11) between the first limiting cooperation part (111) and the second limiting cooperation part (112); or a second limiting part is arranged on the second swing arm (13), and a third limiting cooperation part and a fourth limiting cooperation part are arranged on the swing part (11) to limit the swing of the swing part (11) between the third limiting cooperation part and the fourth limiting cooperation part; or The first swing arm (12) is provided with a first limiting portion (121), the swing piece (11) is provided with a first limiting cooperation portion (111) and a second limiting cooperation portion (112) which limit cooperation with the first limiting portion (121), so as to limit the swing of the swing piece (11) between the first limiting cooperation portion (111) and the second limiting cooperation portion (112); the second swing arm (13) is provided with a second limiting portion, and the swing piece (11) is provided with a third limiting cooperation portion and a fourth limiting cooperation portion which limit cooperation with the second limiting portion, so as to limit the swing of the swing piece (11) between the third limiting cooperation portion and the fourth limiting cooperation portion.

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

6. The seat stretching device according to claim 4, characterized in that, when the first swing arm (12) is provided with a first limiting portion (121), the first limiting cooperation portion (111) and the second limiting cooperation portion (112) are spaced apart by a first preset distance, so that the maximum swing angle of the first swing arm (12) is a, and 67°≤a≤71°; or, when the second swing arm (13) is provided with a second limiting portion, 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 (13) is b, and 72°≤b≤76°; or, when the first swing arm (12) is provided with a first limiting portion (121), the first limiting cooperation portion (111) and the second limiting cooperation portion (112) are spaced apart by a first preset distance, so that the maximum swing angle of the first swing arm (12) is a, and 67°≤a≤71°; when the second swing arm (13) is provided with a second limiting portion, 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 (13) is b, and 72°≤b≤76°.

7. The seat extension device of claim 3, wherein The seat stretching device further comprises a swing limiting piece (30), the leg stretching component (22) is connected with the swing limiting piece (30) to drive the swing limiting piece (30) to move; The first swing arm (12) is provided with a first limiting part (121), the swing limiting piece (30) comprises a fifth limiting part (321) for limiting cooperation with the first limiting part (121), so as to limit the swing of the first swing arm (12) when the leg stretching component (22) is stretched to the lying position; or, The second swing arm (13) is provided with a second limiting part, the swing limiting piece (30) comprises a sixth limiting part for limiting cooperation with the second limiting part, so as to limit the swing of the second swing arm (13) when the leg stretching component (22) is stretched to the lying position; or, The first swing arm (12) is provided with a first limiting part (121), the swing limiting piece (30) comprises a fifth limiting part (321) for limiting cooperation with the first limiting part (121), so as to limit the swing of the first swing arm (12) when the leg stretching component (22) is stretched to the lying position; The second swing arm (13) is provided with a second limiting part, the swing limiting piece (30) comprises a sixth limiting part for limiting cooperation with the second limiting part, so as to limit the swing of the second swing arm (13) when the leg stretching component (22) is stretched to the lying position.

8. The seat extension device of claim 7, wherein, The swing limiting piece (30) comprises a transmission rod (31) and a limiting plate (32), the limiting plate (32) is opposite to and fixedly connected with the transmission rod (31), the leg stretching component (22) is connected with the transmission rod (31) to drive the transmission rod (31) to move; When the first swing arm (12) is provided with a first limiting part (121), the first limiting part (121) is a limiting protrusion, the fifth limiting part (321) is a limiting groove, the fifth limiting part (321) is arranged on the limiting plate (32), the limiting plate (32) further has a first guide surface (322) and a second guide surface (323), the first guide surface (322) and the second guide surface (323) respectively extend outward along the directions of the two sides of the fifth limiting part (321), so as to guide the movement of the first limiting part (121) in different directions when the transmission rod (31) moves; or, When the second swing arm (13) is provided with a second limiting part, the second limiting part is a limiting protrusion, the sixth limiting matching part is a limiting groove, the sixth limiting matching part is arranged on the limiting plate (32), the limiting plate (32) further has a third guide surface and a fourth guide surface, the third guide surface and the fourth guide surface respectively extend outward along the directions of the two sides of the sixth limiting matching part, so as to guide the movement of the second limiting part in different directions when the transmission rod (31) moves; or, When the first swing arm (12) is provided with a first limiting part (121), the first limiting part (121) is a limiting protrusion, the fifth limiting matching part (321) is a limiting groove, the fifth limiting matching part (321) is arranged on the limiting plate (32), the limiting plate (32) further has a first guide surface (322) and a second guide surface (323), the first guide surface (322) and the second guide surface (323) respectively extend outward along the directions of the two sides of the fifth limiting matching part (321), so as to guide the movement of the first limiting part (121) in different directions when the transmission rod (31) moves; when the second swing arm (13) is provided with a second limiting part, the second limiting part is a limiting protrusion, the sixth limiting matching part is a limiting groove, the sixth limiting matching part is arranged on the limiting plate (32), the limiting plate (32) further has a third guide surface and a fourth guide surface, the third guide surface and the fourth guide surface respectively extend outward along the directions of the two sides of the sixth limiting matching part, so as to guide the movement of the second limiting part in different directions when the transmission rod (31) moves.

9. The seat extension device of claim 1, wherein, The seat stretching device further comprises a transmission rod (31), the leg stretching component (22) is connected with the transmission rod (31) to drive the transmission rod (31) to move; the seat stretching device further comprises a backrest transmission assembly (40), the backrest transmission assembly (40) comprises a first driving rod (41), a second driving rod (42) and a third driving rod (43); The first driving rod (41) is respectively hinged with the backrest stretching component (24) and the transmission rod (31) to drive the backrest stretching component (24) to move when the leg stretching component (22) moves, the first end of the second driving rod (42) and the third driving rod (43) are hinged with each other, the other end of the second driving rod (42) is hinged with the bottom frame mounting component (23), and the third driving rod (43) is hinged with 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 component (23) is used for mounting a seat cushion, when the stretching 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°; or, The included angle between the extension direction of the backrest stretching component (24) and the bottom surface of the seat cushion is d, and 122°≤d≤148°; or, The included angle between the extension direction of the backrest stretching component (24) and the bottom surface of the seat cushion is d, and 122°≤d≤148°; or, The foot rest (21) is a plate structure, and an angle between an extension direction of the foot rest (21) and a horizontal plane is e, 4°≤e≤20°; or, An angle between a bottom surface of the seat cushion and a horizontal plane is c, 15°≤c≤45°; an angle between an extension direction of the back rest extension component (24) and the bottom surface of the seat cushion is d, 122°≤d≤148°; or, An angle between a bottom surface of the seat cushion and a horizontal plane is c, 15°≤c≤45°; the foot rest (21) is a plate structure, and an angle between an extension direction of the foot rest (21) and a horizontal plane is e, 4°≤e≤20°; or, An angle between an extension direction of the back rest extension component (24) and the bottom surface of the seat cushion is d, 122°≤d≤148°; the foot rest (21) is a plate structure, and an angle between an extension direction of the foot rest (21) and a horizontal plane is e, 4°≤e≤20°; or, An angle between a bottom surface of the seat cushion and a horizontal plane is c, 15°≤c≤45°; an angle between an extension direction of the back rest extension component (24) and the bottom surface of the seat cushion is d, 122°≤d≤148°; the foot rest (21) is a plate structure, and an angle between an extension direction of the foot rest (21) and a horizontal plane is e, 4°≤e≤20°.

11. An electrically powered rocking chair, characterized in that The seat extension device comprises the seat extension device according to any one of claims 1 to 10.

Images