Seat

Abstract

The seat comprises a backrest base, a backrest body, a seat surface, a multi-connecting-rod mechanism and a linkage assembly, and the backrest body is located on the upper front side of the backrest base and can move relative to the backrest base; the seat surface is arranged below the backrest body and can move relative to the backrest base; the multi-connecting-rod mechanism is rotationally connected with the backrest base and the backrest body and used for driving at least part of the backrest body to move forwards and downwards or backwards and upwards; the linkage assembly is in linkage with the multi-connecting-rod mechanism and rotationally connected with the seat face, and the linkage assembly is constructed to push the seat face to move forwards when the backrest body moves backwards to exceed the vertical direction. According to the seat disclosed by the invention, the seat surface can slide forwards when a user leans backwards to a semi-lying state, so that the seat can be more fit with the buttocks and legs of the user, and the comfort level of the user is increased.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of seats, and in particular to a seat. Background Art

[0002] In the prior art, the seat surface of the chair is often relatively fixed and cannot be moved. When the user is half-lying, the support for the buttocks and legs is not comfortable enough, which affects the user's experience. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a chair, the seat surface of which can slide forward when the user reclines to a semi-lying state, so as to better fit the user's buttocks and legs and increase the user's comfort.

[0004] According to an embodiment of the present invention, the seat includes a backrest base, a backrest body, a seat surface, a multi-link mechanism and a linkage assembly, wherein the backrest body is located on the upper front side of the backrest base and is movable relative to the backrest base; the seat surface is arranged below the backrest body and is movable relative to the backrest base; the multi-link mechanism is rotationally connected to both the backrest base and the backrest body, and is used to drive at least a portion of the backrest body to move forward and downward or backward and upward; the linkage assembly is linked to the multi-link mechanism and is rotationally connected to the seat surface, and the linkage assembly is configured to push the seat surface to move forward when the backrest body moves backward beyond the vertical direction.

[0005] According to the seat of the embodiment of the present invention, a linkage assembly is provided, and the linkage assembly is linked with the multi-link mechanism and is rotatably connected with the seat surface. When the multi-link assembly drives the backrest body to move forward and downward, the linkage assembly remains stationary, so that the seat depth of the seat is shallower, and the backrest body moves downward, which can better support the waist of small-sized users and fit the spine shape of small-sized users more closely, so that small-sized users have a better sense of use; when the multi-link assembly drives the backrest body to move backward and upward, the seat depth of the seat is deeper, and the backrest body moves upward, which can better support the waist of large-sized users and fit the spine shape of large-sized users more closely, so that large-sized users have a better sense of use; when the multi-link assembly drives the backrest body to move backward beyond the vertical direction, the linkage assembly pushes the seat surface to move forward, and when the user leans back to a semi-lying state, the seat surface can slide forward, which can fit the user's buttocks and legs more closely, increasing the user's comfort.

[0006] In some embodiments of the present invention, the linkage assembly includes a linkage body and a pull rod, the upper end of the linkage body is rotatably connected to the backrest body; the pull rod is arranged between the linkage body and the seat surface, one end of the pull rod in the length direction is rotatably connected to the linkage body, and the other end is rotatably connected to the seat surface.

[0007] In some embodiments of the present invention, the seat further comprises a sliding platform, the sliding platform is fixedly connected to the backrest base, and the seat surface is slidably disposed on the sliding platform along the front-rear direction.

[0008] In some embodiments of the present invention, the multi-link mechanism includes a first link and a second link, the first link including a first section and a second section connected in sequence, one end of the first section is rotatably connected to the backrest base, one end of the second section is rotatably connected to the backrest body, one end of the first section away from the backrest base and one end of the second section away from the backrest body are fixedly connected, the first section and the second section are angled with each other and the second section extends forward relative to the first section, at least a portion of the linkage body abuts against the first section and is spaced apart from a position of the first section rotatably connected to the backrest body, the rotation axis of the linkage body rotatably connected to the backrest body coincides with the rotation axis of the first section rotatably connected to the backrest body; the second link is located below the first link, one end of the second link is rotatably connected to the backrest body, and the other end is rotatably connected to the linkage body.

[0009] In some embodiments of the present invention, the length of the line between the second section and the rotation axis of the backrest body and the first section and the rotation axis of the backrest base is L1, the length of the line between the second connecting rod and the rotation axis of the backrest body and the second connecting rod and the rotation axis of the backrest base is L2, and the following conditions are satisfied: L1 <L2。

[0010] In some embodiments of the present invention, the driving device further comprises a driving device, the driving device is disposed on the backrest base, the driving device is connected to the second connecting rod, and is used to drive the second connecting rod to rotate.

[0011] In some embodiments of the present invention, the driving device is a gas rod, one end of which is rotatably connected to the backrest base, and the other end is rotatably connected to the second connecting rod and the connection position is spaced apart from the connection position of the second connecting rod and the backrest base.

[0012] In some embodiments of the present invention, the multi-link mechanism is a plurality of groups arranged in sequence along the left-right direction, and the plurality of groups of the multi-link mechanism are spaced apart.

[0013] In some embodiments of the present invention, at least a portion of a plurality of the first connecting rods are fixedly connected; and / or, at least a portion of a plurality of the second connecting rods are fixedly connected.

[0014] In some embodiments of the present invention, the backrest base includes a first base and a second base, the first base extends in the up-down direction, the second base extends in the front-back direction, the rear end of the second base is connected to the lower end of the first base, the first section is rotatably connected to the upper end of the first base, and when the backrest body moves backward and upward to a vertical position, the length direction of the first section is the same as the length direction of the first base.

[0015] In some embodiments of the present invention, the first section and the second section are a single piece.

[0016] In some embodiments of the present invention, the seat further comprises an elastic member, wherein the elastic member is disposed between the second connecting rod and the backrest base and is used to drive the second connecting rod to rotate forward or backward.

[0017] In some embodiments of the present invention, a connecting member is provided on the rear side of the backrest body, the connecting member extends in the up-down direction, and the second section and the second connecting rod are rotatably connected to the upper and lower ends of the connecting member respectively.

[0018] In some embodiments of the present invention, the seat further comprises a locking member, and the locking member is used to lock the seat surface.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a cross-sectional view of a seat according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0023] Figure 3 is a perspective view of a seat according to an embodiment of the present invention;

[0024] Figure 4 is a three-dimensional diagram of a multi-link mechanism, a linkage assembly and a portion of a backrest body of a seat according to an embodiment of the present invention;

[0025] Figure 5 is a perspective view of a multi-link mechanism and a linkage assembly of a seat according to an embodiment of the present invention;

[0026] Figure 6 is a perspective view of a first link of a seat according to an embodiment of the present invention.

[0027] Reference numerals:

[0028] 100. Seat;

[0029] 1. Backrest base; 11. First base; 12. Second base;

[0030] 2. Backrest body; 21. Connecting parts;

[0031] 3. Seat surface;

[0032] 4. Multi-link mechanism; 41. first link; 411. first section; 412. second section; 42. second link;

[0033] 5. linkage assembly; 51. linkage body; 52. pull rod;

[0034] 6. Sliding platform; 7. Chair legs; 8. Driving device. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Reference below Figure 1-Figure 6 A seat 100 according to an embodiment of the present invention is described.

[0039] like Figure 1 and Figure 2 As shown, the seat 100 according to the embodiment of the present invention includes a backrest base 1, a backrest body 2, a seat surface 3, a multi-link mechanism 4 and a linkage assembly 5.

[0040] Specifically, the backrest base 1 bears the user's weight and various forces in use. The main function of the backrest body 2 is to support the user's back, reduce the pressure on the back and spine, and thus improve the user's comfort.

[0041] Furthermore, the design of the backrest body 2 takes ergonomic principles into consideration to ensure that it can fit the user's back curve and provide the best support effect.

[0042] like Figure 1 and Figure 2 As shown, the backrest body 2 is located on the upper front side of the backrest base 1 and is movable relative to the backrest base 1. The position between the backrest body 2 and the backrest base 1 can be adjusted according to user needs to meet the usage needs of different users.

[0043] Furthermore, if Figure 1 and Figure 3 As shown, the seat surface 3 is arranged below the backrest body 2 and is movable relative to the backrest base 1. The seat surface 3 supports the user's buttocks and thighs to improve the user's comfort.

[0044] like Figure 1 and Figure 2 As shown, the multi-link mechanism 4 is rotatably connected to the backrest base 1 and the backrest body 2, and is used to drive at least a portion of the backrest body 2 to move forward and downward or backward and upward, wherein the front-to-back direction and the up-down direction are as shown in FIG. Figure 1As shown. It can be understood that when the user is small, the multi-link mechanism 4 can drive the backrest body 2 to move forward and downward, so that the seat depth of the seat 100 is shallow, and the backrest body 2 moves downward, which can better support the waist of the small-sized user and fit the spine shape of the small-sized user better, so that the small-sized user has a better feeling when using it; when the user is large, the multi-link mechanism 4 can drive the backrest body 2 to move backward and upward, so that the seat depth of the seat 100 is deep, and the backrest body 2 moves upward, which can better support the waist of the large-sized user and fit the spine shape of the large-sized user better, so that the large-sized user has a better feeling when using it.

[0045] Therefore, the backrest body 2 can be adapted to users of different body shapes and meet the usage needs of users of different body shapes.

[0046] The linkage assembly 5 is linked with the multi-link mechanism 4 and is rotatably connected with the seat surface 3. The linkage assembly 5 is configured to move backward beyond the vertical direction (such as Figure 1 When the user leans back to a semi-lying state, the seat 3 can slide forward to better fit the user's buttocks and legs, thereby increasing the user's comfort.

[0047] According to the chair 100 of the embodiment of the present invention, a linkage assembly 5 is provided, and the linkage assembly 5 is linked with the multi-link mechanism 4 and is rotatably connected with the seat surface 3. When the multi-link assembly drives the backrest body 2 to move forward and downward, the linkage assembly 5 remains stationary, so that the seat depth of the chair 100 is shallow, and the backrest body 2 moves downward, which can better support the waist of a small-sized user and fit the spine shape of the small-sized user better, so that the small-sized user has a better sense of use; when the multi-link assembly drives the backrest body 2 to move backward and upward, the seat depth of the chair 100 is deep, and the backrest body 2 moves upward, which can better support the waist of a large-sized user and fit the spine shape of the large-sized user better, so that the large-sized user has a better sense of use; when the multi-link assembly drives the backrest body 2 to move backward beyond the vertical direction, the linkage assembly 5 pushes the seat surface 3 to move forward, and when the user leans back to a semi-lying state, the seat surface 3 can slide forward, which can fit the user's buttocks and legs better, increasing the user's comfort.

[0048] In some embodiments of the present invention, Figure 1 and Figure 2As shown, the linkage assembly 5 includes a linkage body 51 and a pull rod 52. The upper end of the linkage body 51 is rotatably connected to the backrest body 2. The pull rod 52 is arranged between the linkage body 51 and the seat surface 3. One end of the pull rod 52 in the length direction is rotatably connected to the linkage body 51, and the other end is rotatably connected to the seat surface 3. When the multi-link assembly drives the backrest body 2 to move backward beyond the vertical direction, the upper end of the linkage body 51 rotates relative to the backrest body 2, and the lower end of the linkage body 51 rotates forward, driving the pull rod 52 to push the seat surface 3 forward to slide. The driving structure of the linkage assembly 5 that drives the seat surface 3 to slide forward is relatively simple and reliable.

[0049] In some embodiments of the present invention, Figure 1 As shown, the seat 100 also includes a sliding platform 6, which is fixedly connected to the backrest base 1, and the seat surface 3 is arranged along the front-to-back direction (such as Figure 1 The front and rear directions shown in the figure are slidably arranged on the sliding platform 6. The sliding platform 6 can provide support for the backrest base 1, so that the sliding of the seat surface 3 can be simpler and more reliable.

[0050] In addition, the chair 100 further includes chair legs 7, which are used to provide support for other components of the chair 100 such as the seat surface 3, etc., so that the structure of the sliding platform 6 is more reliable.

[0051] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the multi-link mechanism 4 includes a first link 41 and a second link 42. Figure 6 As shown, the first connecting rod 41 includes a first section 411 and a second section 412 connected in sequence, one end of the first section 411 is rotatably connected to the backrest base 1, and one end of the second section 412 is rotatably connected to the backrest body 2, thereby realizing a preliminary connection between the backrest body 2 and the seat 100. One end of the first section 411 away from the backrest base 1 and one end of the second section 412 away from the backrest body 2 are fixedly connected, the first section 411 and the second section 412 are at an angle to each other, and the second section 412 extends forward relative to the first section 411, so that the first connecting rod 41 is conveniently connected to the backrest body 2 located at the front upper side of the backrest base 1, and the backrest body 2 can be closer to the back and waist curve of the user, and the support effect on the back and waist of the user is better.

[0052] like Figure 2 and Figure 5As shown, at least a part of the linkage body 51 abuts against the first section 411 and is spaced apart from the position where the first section 411 is rotatably connected to the backrest body 2. When the first section 411 continuously rotates backward beyond the vertical direction, it can drive the linkage body 51 to rotate. The rotation axis of the linkage body 51 where it is rotatably connected to the backrest body 2 coincides with the rotation axis of the first section 411 where it is rotatably connected to the backrest body 2, so that the linkage body 51 rotates synchronously with the first link 41. The rotation of the linkage body 51 is relatively reliable, and the connection positions of the first link 41, the linkage body 51, and the backrest base 1 are arranged at the same place, which can reduce the processing holes on the backrest base 1 and reduce the processing cost of the backrest base 1.

[0053] The second link 42 is located below the first link 41. One end of the second link 42 is rotatably connected to the backrest body 2, and the other end is rotatably connected to the linkage body 51. There are two connection positions between the backrest body 2 and the backrest base 1, which can prevent the backrest body 2 from rotating when the multi-link mechanism 4 drives the backrest body 2 to move forward and downward or drives the backrest body 2 to move backward and upward, making the forward and downward movement or backward and upward movement of the backrest body 2 relatively stable and reliable.

[0054] Further, as Figure 1 and Figure 2 shown, the length of the connecting line between the rotation axis of the second section 412 and the backrest body 2 and the rotation axis of the first section 411 and the backrest base 1 is L1, and the length of the connecting line between the rotation axis of the second link 42 and the backrest body 2 and the rotation axis of the second link 42 and the backrest base 1 is L2, and it satisfies: L1 < L2. At this time, when the multi-link mechanism 4 drives the backrest body 2 to move forward and downward, the forward movement distance of the lower end position connected by the second link 42 is relatively large, so that the lumbar support component located at the lower end of the backrest body 2 can better support the user's waist, making the user's experience better.

[0055] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, the seat 100 further includes a driving device 8. The driving device 8 is arranged on the backrest base 1 and is connected to the second link 42 for driving the second link 42 to rotate. When the second link 42 rotates, it drives the backrest body 2 to move forward and downward or drives the backrest body 2 to move backward and upward, and the first link 41 rotates accordingly, realizing the driving of the backrest body 2 by the multi-link mechanism 4, and the driving method is relatively simple.

[0056] Furthermore, the driving device 8 is a gas rod, one end of which is rotatably connected to the backrest base 1, and the other end is rotatably connected to the second connecting rod 42, and the connection position is spaced apart from the connection position of the second connecting rod 42 and the backrest base 1. The gas rod drives the second connecting rod 42 through air pressure changes. When the gas rod needs to be extended, high-pressure gas is released through a valve to push the piston outward, thereby extending the gas rod and pushing the second connecting rod 42 away. Conversely, when the gas rod needs to be retracted, the valve can be used to control the reflux of gas to move the piston inward, retract the gas rod, and pull the second connecting rod 42 closer. The gas rod is easy to adjust, the supporting force is uniform, and the gas rod is durable.

[0057] In some embodiments of the present invention, Figure 4-Figure 6 As shown, the multi-link mechanism 4 is along the left and right directions (such as Figure 4 The multiple groups of multi-link mechanisms 4 are arranged in sequence in the left and right directions as shown, and the multiple groups of multi-link mechanisms 4 are separated. The backrest body 2 can be driven at multiple locations in the left and right directions, so that the movement of the backrest body 2 is more stable, avoiding vibration of the backrest body 2 and affecting the user's experience.

[0058] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, at least a portion of the multiple first connecting rods 41 are fixedly connected, so that the multiple first connecting rods 41 can be connected as a whole, which can disperse the pressure received by the first connecting rods 41 and increase the strength of the first connecting rods 41.

[0059] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, at least a portion of the plurality of second connecting rods 42 are fixedly connected, so that the plurality of second connecting rods 42 can be connected as a whole, which can disperse the pressure received by the second connecting rods 42 and increase the strength of the second connecting rods 42 .

[0060] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the backrest base 1 includes a first base 11 and a second base 12, the first base 11 extends in the up-down direction, and the second base 12 extends in the front-back direction (such as Figure 1 The rear end of the second base 12 is connected to the lower end of the first base 11, so as to facilitate the connection between the backrest base 1 and the seat surface 3 of the seat 100. The first section 411 is rotatably connected to the upper end of the first base 11. When the backrest body 2 moves backward and upward to the maximum position, the length direction of the first section 411 is the same as the length direction of the first base 11, so that when the backrest body 2 moves backward and upward to the maximum position, the first section 411 and the first base 11 are both in the up-down direction (as shown). Figure 1The backrest body 2 extends in the up and down direction, which can better support the user's back and waist as a whole when the user sits upright, thereby enhancing the user's usage experience.

[0061] Meanwhile, the front side of the first base 11 is hollow, and at least a portion of the second connecting rod 42 is disposed in the hollow area of ​​the first base 11 , so as to facilitate the assembly of the second connecting rod 42 .

[0062] In some embodiments of the present invention, the first section 411 and the second section 412 are an integral piece, which can simplify the processing and manufacturing process of the first connecting rod 41 and facilitate the assembly of the first connecting rod 41 with the backrest body 2 and the backrest base 1, thereby reducing the cost of the seat 100.

[0063] In some embodiments of the present invention, the seat 100 further includes an elastic member, which is disposed between the second connecting rod 42 and the backrest base 1, and is used to drive the second connecting rod 42 to rotate forward or backward, and can increase the driving force on the second connecting rod 42 when the gas rod drives the second connecting rod 42 to rotate, so as to facilitate the movement of the backrest body 2. For example, the elastic member is used to drive the second connecting rod 42 to rotate forward, and when the backrest body 2 moves backward and upward to the maximum position, the elastic member is stretched, and when the external force applied by the gas rod to the second connecting rod 42 to rotate backward disappears, the elastic member can drive the second connecting rod 42 to rotate forward; the elastic member is used to drive the second connecting rod 42 to rotate backward, and when the backrest body 2 moves forward and downward to the maximum position, the elastic member is compressed, and when the external force applied by the gas rod to the second connecting rod 42 to rotate forward disappears, the elastic member can drive the second connecting rod 42 to rotate backward.

[0064] In some embodiments of the present invention, Figure 1 and Figure 4 As shown, a connecting member 21 is provided at the rear side of the backrest body 2, and the connecting member 21 extends in the up-down direction, and the second section 412 and the second connecting rod 42 are rotatably connected to the upper and lower ends of the connecting member 21, respectively. The process in which the second section 412 and the second connecting rod 42 drive the backrest body 2 to move is buffered by the connecting member 21, so that the backrest body 2 is not damaged when the second section 412 and the second connecting rod 42 apply force to the backrest body 2, thereby increasing the reliability of the backrest body 2. In addition, the connecting member 21 can serve as the skeleton of the backrest body 2, and other parts of the backrest body 2 can be elastic members, which can increase the comfort of the user when leaning on the backrest body 2.

[0065] In some embodiments of the present invention, the seat 100 also includes a locking member, which is used to lock the seat surface 3. The locking member can be used according to the user's usage requirements. After the user reaches the required lying angle, the seat surface 3 is locked to meet the user's different usage requirements.

[0066] Other structures and operations of the seat 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0068] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A seat, characterized in that: include: Backrest base; A backrest body, the backrest body is located at the front upper side of the backrest base and is movable relative to the backrest base; A seat surface, the seat surface is arranged below the backrest body and is movable relative to the backrest base; a multi-link mechanism, the multi-link mechanism being rotatably connected to both the backrest base and the backrest body, and being used to drive at least a portion of the backrest body to move forward and downward or backward and upward; A linkage assembly is linked with the multi-link mechanism and is rotationally connected with the seat surface. The linkage assembly is configured to push the seat surface to move forward when the backrest body moves backward beyond the vertical direction.

2. The seat according to claim 1, characterized in that: The linkage components include: A linkage body, the upper end of which is rotatably connected to the backrest body; A pull rod is arranged between the linkage body and the seat surface, one end of the pull rod in the length direction is rotatably connected to the linkage body, and the other end is rotatably connected to the seat surface.

3. The seat according to claim 1, characterized in that: Also includes: A sliding platform is fixedly connected to the backrest base, and the seat surface is slidably arranged on the sliding platform along the front-back direction.

4. The seat according to claim 2, characterized in that: The multi-link mechanism comprises: a first connecting rod, the first connecting rod comprising a first section and a second section connected in sequence, one end of the first section being rotatably connected to the backrest base, one end of the second section being rotatably connected to the backrest body, one end of the first section away from the backrest base and one end of the second section away from the backrest body being fixedly connected, the first section and the second section being angled with each other and the second section extending forward relative to the first section, at least a portion of the linkage body abutting against the first section and spaced apart from a position of the first section rotatably connected to the backrest body, and a rotation axis of the linkage body rotatably connected to the backrest body coincides with a rotation axis of the first section rotatably connected to the backrest body; A second connecting rod, wherein the second connecting rod is located below the first connecting rod, one end of the second connecting rod is rotatably connected to the backrest body, and the other end of the second connecting rod is rotatably connected to the linkage body.

5. The seat according to claim 4, characterized in that: The length of the line between the second section and the rotation axis of the backrest body and the first section and the rotation axis of the backrest base is L1, the length of the line between the second connecting rod and the rotation axis of the backrest body and the rotation axis of the second connecting rod and the backrest base is L2, and it satisfies: L1 <L2。 6. The seat according to claim 4, characterized in that: Also includes: A driving device is disposed on the backrest base and connected to the second connecting rod to drive the second connecting rod to rotate.

7. The seat according to claim 6, characterized in that The driving device is a gas rod, one end of which is rotatably connected to the backrest base, and the other end of which is rotatably connected to the second connecting rod, and the connection position is spaced apart from the connection position of the second connecting rod and the backrest base.

8. The seat according to claim 4, characterized in that: The multi-link mechanism is a plurality of groups arranged in sequence along the left-right direction, and the plurality of groups of the multi-link mechanism are spaced apart.

9. The seat according to claim 8, characterized in that At least some of the first connecting rods are fixedly connected; And / or, at least parts of a plurality of the second connecting rods are fixedly connected.

10. The seat according to claim 4, characterized in that The backrest base includes a first base and a second base, the first base extends in the up-down direction, the second base extends in the front-back direction, the rear end of the second base is connected to the lower end of the first base, the first section is rotatably connected to the upper end of the first base, and when the backrest body moves backward and upward to a vertical position, the length direction of the first section is the same as the length direction of the first base.

11. The seat according to claim 4, characterized in that The first section and the second section are a single piece.

12. The seat according to claim 4, characterized in that Also includes: An elastic member is disposed between the second connecting rod and the backrest base, and is used for driving the second connecting rod to rotate forward or backward.

13. The seat according to claim 4, characterized in that A connecting piece is provided on the rear side of the backrest body, and the connecting piece extends in the up-down direction. The second section and the second connecting rod are rotatably connected to the upper and lower ends of the connecting piece respectively.

14. The seat according to claim 1, characterized in that Also includes: A locking member is used to lock the seat surface.

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