Seats

Abstract

This utility model relates to a seat, comprising: a rear lifting linkage assembly disposed inside the seat frame assembly; a transmission linkage disposed outside the seat frame assembly, one end of which is hinged to the backrest assembly; and an actuating assembly rotatably disposed on the seat frame assembly, hinged to the other end of the transmission linkage, including a lifting drive end located inside the seat frame assembly, below the rear lifting linkage assembly. When the backrest assembly is rotated rearward for adjustment, the actuating assembly can be rotated relative to the seat frame assembly via the transmission linkage, thereby causing the lifting drive end to contact the rear lifting linkage assembly, and the contact point to move along a direction away from the rotation center of the rear lifting linkage assembly to lift the rear part of the rear lifting linkage assembly upward. The transmission linkage of this utility model is located outside the seat frame assembly; this structural arrangement effectively avoids affecting the foot space of the seat, allowing the lower end of the backrest to be minimized as much as possible, thus providing better foot space.

Description

Technical Field

[0001] This utility model relates to the technical field of seats, and specifically to a type of seat. Background Technology

[0002] When the seat is designed to provide thigh support, the seat cushion is tilted to a certain extent. This results in a height difference between the lower end of the backrest and the rear end of the seat cushion when the seat back is folded down. As a result, when the occupant lies down, their lower back is unsupported and affects comfort.

[0003] To address this technical problem, the applicant has provided a linkage mechanism located on the inner side of the seat cushion side panel. This mechanism drives the rear end of the seat cushion to rise a certain height when the backrest is reclined to provide lumbar support. However, because this linkage mechanism is located on the inner side of the seat cushion side panel, it affects the space available in the lower part of the backrest and the rear of the seat cushion. For seats requiring more legroom, this linkage mechanism cannot be used, thus necessitating a new solution. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the prior art and provide a seat that solves the problem that the existing linkage mechanism is arranged on the inside of the side panel of the seat cushion, thus affecting the leg space.

[0005] The technical solution to achieve the above objectives is:

[0006] This utility model provides a seat, including a backrest assembly, a seat frame assembly, and a seat cushion rear lifting mechanism disposed between the backrest assembly and the seat frame assembly, wherein the seat cushion rear lifting mechanism includes:

[0007] A rear lifting link assembly is provided inside the seat frame assembly, and the front part of the rear lifting link assembly is hinged to the seat frame assembly;

[0008] A transmission link is provided on the outside of the seat frame assembly, and the first connecting end of the transmission link is hinged to the backrest assembly.

[0009] A toggle assembly rotatably mounted on the seat frame assembly is hinged to a second connecting end of the transmission link. The toggle assembly includes a lifting drive end located inside the seat frame assembly, below the rear lifting link assembly, and configured to rotate the toggle assembly relative to the seat frame assembly via the transmission link when the backrest assembly is rotated rearward. This causes the lifting drive end to contact the rear lifting link assembly, and the contact point moves in a direction away from the rotation center of the rear lifting link assembly to lift the rear part of the rear lifting link assembly upward.

[0010] A further improvement of this utility model of the seat is that, when the seat is in the designed position, a gap is formed between the lifting drive end and the rear lifting linkage assembly, the gap being configured such that:

[0011] When the backrest assembly is rotated forward for adjustment, the lifting drive end rotates away from the rear lifting linkage assembly, while the rear lifting linkage assembly remains stationary.

[0012] When the backrest assembly is rotated rearward for adjustment, the lifting drive end rotates toward the rear lifting linkage assembly, and the rear lifting linkage assembly remains stationary before contacting it.

[0013] A further improvement of this utility model of the seat is that the seat frame assembly includes seat frame side plates disposed opposite to each other;

[0014] The actuation assembly includes an actuation shaft rotatably mounted on the corresponding seat frame side plate, a first actuation link fixedly connected to one end of the actuation shaft and located on the outside of the seat frame side plate, and a second actuation link fixedly connected to the other end of the actuation shaft and located on the inside of the seat frame side plate.

[0015] The end of the first actuating link away from the actuating shaft is hinged to the second connecting end of the transmission link;

[0016] The lifting drive end is provided at the end of the second actuating link away from the actuating shaft.

[0017] A further improvement of this utility model of the seat is that a roller is hinged to the end of the second actuating link away from the actuating shaft;

[0018] The roller is the lifting drive end.

[0019] A further improvement of this utility model of the seat is that the seat frame assembly includes seat frame side plates arranged opposite to each other, and a limiting frame is provided on the inner side of the seat frame side plates;

[0020] When the seat is in the designed position, the limiting bracket supports the rear of the rear lifting linkage assembly.

[0021] A further improvement of this utility model seat is that an elastic element is provided at the hinge of the front part of the rear lifting link assembly. One end of the elastic element is connected to the seat frame assembly, and the other end of the elastic element is connected to the rear lifting link assembly to apply a restoring elastic force to the rear lifting link assembly.

[0022] A further improvement of the seat of this utility model is that it also includes a front seat basin disposed on the seat frame assembly and a suspension spring connected to the rear end of the front seat basin. The rear end of the suspension spring is hooked to the rear part of the rear lifting linkage assembly, so that the rear end of the suspension spring can be lifted upward together with the rear part of the rear lifting linkage assembly (21).

[0023] A further improvement of this utility model seat is that it also includes a seat basin disposed on the seat frame assembly, the front end of the seat basin being rotatable relative to the seat frame assembly, and the rear end of the seat basin being rotatably connected to the rear part of the rear lifting linkage assembly.

[0024] A further improvement of this utility model seat is that a front lifting mechanism is provided at the front of the seat frame assembly;

[0025] The front end of the basin is rotatably connected to the front lifting mechanism, which can drive the front end of the basin to lift upward.

[0026] A further improvement of the seat of this utility model is that the rear lifting linkage assembly includes a lifting linkage and brackets disposed at both ends of the lifting linkage;

[0027] The front part of the bracket is hinged to the seat frame assembly.

[0028] The beneficial effects of this utility model of seat are as follows:

[0029] The seat cushion rear lifting mechanism of this utility model has a transmission link located on the outside of the seat frame assembly. The transmission link and the actuation component are used to realize the linkage between the rear lifting link assembly and the backrest assembly. This structural arrangement can effectively avoid affecting the foot space of the lower part of the seat back and the rear of the seat cushion, so that the lower part of the backrest is minimized and better foot space is obtained.

[0030] The seat of this utility model has the transmission linkage arranged on the outside of the seat frame side plate. The transmission linkage can be completely covered by a plastic cover, which has no impact on the overall appearance of the seat and is conducive to covering.

[0031] The seat of this utility model has a gap between the toggle component and the rear lifting linkage component. When the backrest assembly is rotated backward for adjustment, the toggle component has a certain free travel before contacting the rear lifting linkage component. This can satisfy the comfort adjustment of the backrest assembly without affecting the seat height. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of the seat frame of this utility model.

[0033] Figure 2 for Figure 1 A schematic diagram of the exploded decomposition structure shown.

[0034] Figure 3 This is a side view of the seat frame of this utility model.

[0035] Figure 4 This is a partially enlarged schematic diagram of the mounting location of the actuation component in the seat of this utility model.

[0036] Figure 5 This is a three-dimensional structural diagram of the actuation component in the seat of this utility model.

[0037] Figure 6 This is a partially enlarged schematic diagram of the mounting location of the limiting frame in the seat of this utility model.

[0038] Figure 7 This is a three-dimensional structural diagram of the seat of this utility model, showing the front seat pan and suspension spring installed on the seat frame assembly.

[0039] Figure 8 This is an exploded exploded view of the hinge structure of the rear lifting linkage assembly of the seat of this utility model.

[0040] Figure 9 This is a side view of the seat of this utility model in the designed position.

[0041] Figure 10 A side view showing the angle at which the backrest of the seat of this utility model is rotated backward.

[0042] Figure 11 This is a side view of the backrest of the seat of this utility model in the reclined position.

[0043] Figure 12 For the seat of this utility model in Figure 9 A simplified diagram illustrating the principle of the seat cushion lifting mechanism at the designed position.

[0044] Figure 13 For the seat of this utility model in Figure 10 A simplified diagram illustrating the principle of the seat cushion lifting mechanism at the indicated position.

[0045] Figure 14 For the seat of this utility model in Figure 11 The diagram shows a simplified schematic of the lifting mechanism behind the seat when it is in the reclined position.

[0046] Figure 15 This is a side view of the seat frame of this utility model in the designed position.

[0047] Figure 16 This is a side view of the backrest assembly of the seat frame of this utility model rotating backward at a set angle.

[0048] Figure 17 This is a side view of the backrest assembly of the seat frame of this utility model in the folded-down position.

[0049] Figure 18 For the seat of this utility model in Figure 15 The diagram shows the positional relationship between the roller and the rear lifting linkage assembly at the design position.

[0050] Figure 19 For the seat of this utility model in Figure 16 The diagram shows the positional relationship between the roller and the rear lifting linkage assembly.

[0051] Figure 20 For the seat of this utility model in Figure 17 The diagram shows the positional relationship between the rollers and the rear lifting linkage assembly when the rollers are in the lowered position.

[0052] Figure 21 This is a three-dimensional structural diagram of the seat frame of this utility model at the designed position.

[0053] Figure 22 This is a three-dimensional structural diagram of the backrest assembly of the seat frame of this utility model, showing its rearward rotation at a set angle.

[0054] Figure 23 This is a three-dimensional structural diagram of the backrest assembly of the seat frame of this utility model in the folded-down position.

[0055] Figure 24 For the seat of this utility model in Figure 21 The diagram shown illustrates the position of the toggle component.

[0056] Figure 25 For the seat of this utility model in Figure 22 The position shown is a schematic diagram of the state of the toggle component.

[0057] Figure 26 For the seat of this utility model in Figure 23 The diagram shows the state of the toggle component when it is in the reclined position.

[0058] Figure 27 This is a three-dimensional structural diagram of the toggle assembly of the seat of this utility model in its designed position.

[0059] Figure 28 This is a three-dimensional structural diagram of the toggle assembly of the seat of this utility model in the raised state.

[0060] Figure 29 This is a schematic diagram of the principle of the seat cushion lifting mechanism in the designed position of the second embodiment of the seat of this utility model.

[0061] Figure 30 This is a simplified schematic diagram of the principle of the seat cushion lifting mechanism when the backrest assembly is rotated backward at a set angle, which is the second embodiment of the seat of this utility model.

[0062] Figure 31 This is a simplified schematic diagram of the principle of the seat cushion lifting mechanism in the reclined position, as shown in the second embodiment of the seat of this utility model.

[0063] Figure 32 This is a three-dimensional structural diagram of the frame of the third embodiment of the seat of this utility model.

[0064] Figure 33 This is a three-dimensional structural diagram of the front lifting mechanism in the third embodiment of the seat of this utility model.

[0065] Figure 34 This is an exploded disassembly diagram of the third embodiment of the seat of this utility model.

[0066] Figure 35 This is a three-dimensional structural diagram of the third embodiment of the seat of this utility model at the designed position.

[0067] Figure 36 This is a three-dimensional structural diagram of the backrest assembly of the third embodiment of the seat of this utility model, showing its rearward rotation at a set angle.

[0068] Figure 37 This is a three-dimensional structural diagram of the backrest assembly in the reclined position, according to the third embodiment of the seat of this utility model.

[0069] Figure 38 This is a side view of the third embodiment of the seat of this utility model in the design position.

[0070] Figure 39 This is a side view of the backrest assembly of the third embodiment of the seat of this utility model, showing it rotated backward at a set angle.

[0071] Figure 40 This is a side view of the backrest assembly in the reclined position, according to a third embodiment of the seat of this utility model.

[0072] Figure 41 This is a side view of the seat basin in the designed position of the third embodiment of the seat of this utility model.

[0073] Figure 42 This is a side view of the seat basin in the forward-raised state of the third embodiment of the seat of this utility model.

[0074] Explanation of reference numerals in the attached figures:

[0075] Backrest assembly - 11; Drive linkage - 111; Seat frame assembly - 12; Seat frame side plate - 121; Mounting bracket - 122; Front support tube - 123; Seat cushion - 13;

[0076] Rear lifting linkage assembly - 21; Lifting linkage - 211; Bracket - 212; Hinge - 213; Transmission linkage - 22; Actuating assembly - 23; Actuating shaft - 231; First actuating linkage - 232; Second actuating linkage - 233; Roller - 234; Clearance - 24; Front seat - 251; Suspension spring - 252; Seat - 253; Front connecting seat - 2531; Rear connecting seat - 2532; Limiting bracket - 26; Torsion spring - 27;

[0077] Front link - 311; Lift link - 312. Detailed Implementation

[0078] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0079] See Figure 1 This utility model provides a seat that, by incorporating a seat cushion lifting mechanism between the backrest assembly 11 and the seat frame assembly 12, raises the rear end of the seat cushion upwards during the reclining process of the backrest assembly 11. This solves the problem of discomfort caused to the occupant due to the height difference between the lower end of the backrest assembly 11 and the rear end of the seat cushion in the reclined position. Furthermore, the transmission link 22 of the seat cushion lifting mechanism is arranged on the outer side of the seat frame assembly 12 to minimize the lower end of the backrest assembly 11, thereby providing better legroom. The structure of this utility model seat will be described below with reference to the accompanying drawings.

[0080] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0081] See Figure 1 This shows a three-dimensional structural diagram of the seat frame of this utility model. (See attached diagram.) Figure 2 It shows Figure 1 The diagram shows the exploded decomposition structure of the illustrated structure. The following is a related explanation. Figure 1 and Figure 2 The structure of the seat of this utility model will be described.

[0082] like Figure 1 and Figure 2As shown, the seat of this utility model includes a backrest assembly 11, a seat frame assembly 12, and a seat cushion rear lifting mechanism disposed between the backrest assembly 11 and the seat frame assembly 12. The seat cushion rear lifting mechanism includes a rear lifting linkage assembly 21, a transmission linkage 22, and a toggle assembly 23. The rear lifting linkage assembly 21 is disposed inside the seat frame assembly 12, and its front part is hinged to the seat frame assembly 12, allowing the rear part of the rear lifting linkage assembly 21 to rotate around the hinge point at the front. Preferably, the rear part of the rear lifting linkage assembly 22 is disposed close to the backrest assembly 11. The transmission linkage 22 is disposed outside the seat frame assembly 12 and includes a first connecting end and a second connecting end. The first connecting end of the lever 22 is hinged to the backrest assembly 11; the actuating assembly 23 is rotatably mounted on the seat frame assembly 12, and the actuating assembly 23 is hinged to the second connecting end of the transmission link 22. The actuating assembly 23 includes a lifting drive end located inside the seat frame assembly 12, which is located below the rear lifting link assembly 21. When the backrest assembly 11 is rotated backward for adjustment, the actuating assembly 23 can be driven to rotate relative to the seat frame assembly 12 via the transmission link 22, thereby causing the lifting drive end to contact the rear lifting link assembly 21 and the contact point to move in a direction away from the rotation center of the rear lifting link assembly 21 (i.e., the front hinge) so that the rear part of the rear lifting link assembly 21 is lifted upward.

[0083] In this invention, during the rearward rotation of the backrest assembly 11, the transmission link 22 drives the actuation component 23 to rotate, allowing the lifting drive end of the actuation component 23 to contact the rear lifting link assembly 21. The rotation of the actuation component 23 moves the lifting drive end away from the front hinge of the lifting link assembly 21, causing the rear part of the rear lifting link assembly 21 to rise. This upward lifting of the rear part of the rear lifting link assembly 21 pushes against the rear part of the seat cushion mounted on it, raising it upwards together and improving the comfort of the occupant when lying down. In this invention, the transmission link 22 is located on the outer side of the seat frame assembly 12, see reference. Figure 1 As shown, only the rear cross tube of the seat frame assembly 12 is provided at the lower end of the backrest assembly 11, without any other additional mechanisms, so that the lower end of the backrest assembly 11 can be narrowed as much as possible to obtain better foot space (allowing rear passengers to put their feet under the front seats).

[0084] Furthermore, combined Figure 3 , Figure 4 , Figure 15 and Figure 18As shown, at the designed position, a gap 24 is formed between the lifting drive end and the rear lifting linkage assembly 21; when the backrest assembly 11 is rotated forward for adjustment, the lifting drive end rotates away from the rear lifting linkage assembly 21, and the rear lifting linkage assembly 21 remains stationary; when the backrest assembly 11 is rotated backward for adjustment, the lifting drive end rotates towards the rear lifting linkage assembly 21, and the rear lifting linkage assembly 21 remains stationary before contacting it.

[0085] Because of the gap 24, combined Figure 16 and Figure 19 As shown, during the rearward rotation of the backrest assembly 11 to a set angle, the lifting drive end of the actuating component 23 rotates a short distance towards the rear lifting linkage assembly 21 before contacting it. This short distance provides space for comfort adjustment of the backrest assembly 11, ensuring that the backrest assembly 11 does not interact with the rear lifting linkage assembly 21 during comfort adjustment. Furthermore, combined with... Figure 17 and Figure 20 As shown, when the lifting drive end contacts the rear lifting linkage assembly 21, the backrest assembly 11 continues to rotate backward to the reclining position, and the lifting drive end rotates upward, thereby pushing the rear lifting linkage assembly 21 to rotate upward around the front hinge, thus realizing the upward lifting of the rear part of the rear lifting linkage assembly 21.

[0086] Preferably, the size of the gap 24 can be set according to the required comfort adjustment angle of the backrest assembly 11.

[0087] Furthermore, such as Figure 2 and Figure 3 As shown, a drive link 111 is provided on the outer side of the backrest assembly 11. The drive link 111 can be fixedly connected to the backrest assembly 11 or integrally formed with the backrest assembly 11. The end of the drive link 111 is hinged to the first connecting end of the transmission link 22.

[0088] In one specific embodiment of this utility model, such as Figure 2 , Figure 4 and Figure 5 As shown, the seat frame assembly 12 includes a seat frame side plate 121 disposed opposite to each other; the actuation assembly 23 includes an actuation shaft 231 rotatably disposed on the corresponding seat frame side plate 121, a first actuation link 232 fixedly connected to one end of the actuation shaft 231 and located outside the seat frame side plate 121, and a second actuation link 233 fixedly connected to the other end of the actuation shaft 231 and located inside the seat frame side plate 121; the end of the first actuation link 232 away from the actuation shaft 231 is hinged to the second connecting end of the transmission link 22; the end of the second actuation link 233 away from the actuation shaft 231 is provided with a lifting drive end.

[0089] Thus, the actuating shaft 231 can rotate relative to the seat frame side plate 121. When rotating, the actuating shaft 231 can drive the first actuating link 232 and the second actuating link 233 at both ends to rotate together. Through the structural arrangement of this actuating assembly 23, the first actuating link 232 can be pulled to rotate by the transmission link 22, thereby causing the actuating shaft 231 and the second actuating link 233 to rotate together, so that the lifting drive end rotates towards the rear lifting link assembly 21.

[0090] Furthermore, a roller 234 is hinged to the end of the second actuating link 233 away from the actuating shaft 231; this roller 234 serves as the lifting drive end. By using the rotatable roller 234 as the lifting drive end, during the upward lifting of the rear lifting link assembly 21, the roller 234 reduces friction with the rear lifting link assembly 21 through rotation, and also reduces noise generated by contact between the mechanisms. Of course, theoretically, the roller could also be fixedly connected to the end of the second actuating link 233 away from the actuating shaft 231, but this would generate greater friction, causing abnormal noise and other problems.

[0091] In one specific embodiment of this utility model, such as Figure 2 , Figure 7 , Figures 18 to 20 As shown, the seat frame assembly 12 includes a seat frame side plate 121 disposed opposite to each other; the inner limiting frame 26 of the seat frame side plate 121 supports the rear of the rear lifting linkage assembly 21 when the seat is in the designed position.

[0092] A limiting bracket 26 is provided on the inner side of the seat frame side plate 121 to support the rear lifting linkage assembly 21. In this way, at the designed position, the rear lifting linkage assembly 21 is placed on the limiting bracket 26. When the passenger sits on the rear of the seat cushion, the rear lifting linkage assembly 21 can be maintained in a fixed position under the support of the limiting bracket 26 and will not rotate downward around the front hinge, thus improving the passenger's riding experience.

[0093] Furthermore, the top of the limiting frame 26 is provided with a locking protrusion, and the rear lifting link assembly 21 is provided with a corresponding locking groove. When the rear lifting link assembly 21 is placed on the limiting frame 26, the locking protrusion is locked in the locking groove.

[0094] Furthermore, such as Figure 7 and Figure 8 As shown, an elastic element is provided at the hinge of the front part of the rear lifting link assembly 21. One end of the elastic element is connected to the seat frame assembly 12, and the other end of the elastic element is connected to the rear lifting link assembly 21 to apply a restoring elastic force to the rear lifting link assembly 21.

[0095] The elastic element is a torsion spring 27. The torsion spring 27 is installed at the hinge of the rear lifting linkage assembly 21. When the rear lifting linkage assembly 21 rotates around the hinge, causing its rear part to lift upwards, the torsion spring 27 stores energy. When the lifting drive end of the actuating assembly 23 rotates away from the rear lifting linkage assembly 21, the rear part of the lifting linkage assembly 21 can rotate downwards under the action of the torsion spring 27, thus placing it on the limiting bracket 26. The elastic element can also be a spring or other structure.

[0096] Furthermore, the rear lifting linkage assembly 21 is hinged to the seat frame side plate 121 via a hinge 213. A torsion spring 27 is sleeved on the hinge 213, with one end of the torsion spring 27 fixedly connected to the rear lifting linkage assembly 21 and the other end of the torsion spring 27 fixedly connected to the seat frame side plate 121. The hinge 213 is preferably a stepped bolt.

[0097] Furthermore, a mounting bracket 122 is provided on the seat frame side plate 121 corresponding to the hinge 121. The mounting bracket 122 can be welded and fixed to the seat frame side plate 121, or it can be integrally formed with the seat frame side plate 121. The mounting bracket 122 is provided with a hinge hole corresponding to the hinge 213, and one end of the hinge 213 is rotatably disposed in the hinge hole.

[0098] Furthermore, such as Figure 7 and Figure 8 As shown, the rear lifting linkage assembly 21 includes a lifting linkage 211 and brackets 212 located at both ends of the lifting linkage 211. The front part of the brackets 212 is hinged to the seat frame assembly 12. In the lifted state, the lifting linkage 211 of the rear lifting linkage assembly 21 is lifted upward to a certain height under the rotation of the brackets 212.

[0099] Accordingly, the transmission linkage 22 and the actuation assembly 23 are located on both sides of the seat frame assembly 12 to mate with the corresponding brackets 212. In the designed position, such as... Figure 2 As shown, the rear lifting drive end is located below the bracket 212 and has a gap 24 between it and the bracket 212.

[0100] The rear lifting linkage assembly 21 can also be a tubular component, such as a U-shaped tubular component. The U-shaped tubular component can be provided with a structural surface that mates with the roller 234 to improve the stability of the lifting process.

[0101] like Figures 1 to 7 As shown, in the first embodiment, the seat also includes a front seat basin 251 disposed on the seat frame assembly 12 and a suspension spring 252 connected to the rear end of the front seat basin 251. The rear end of the suspension spring 252 is hooked to the rear part of the rear lifting link assembly 21, so that the rear end of the suspension spring 252 can be lifted upward together with the rear part of the rear lifting link assembly 21.

[0102] The front end of the suspension spring 252 is attached to the rear end of the front seat 25, and the rear end of the suspension spring 252 can rotate upward around the front end. Furthermore, the rear end of the suspension spring 252 is attached to the lifting link 211.

[0103] The principle of the seat cushion lifting mechanism of this utility model will be explained below with reference to the accompanying drawings.

[0104] like Figures 9 to 11 As shown, foam is provided on the front seat 251 and suspension spring 252 to form a seat cushion 13, and the seat cushion 13 is covered with a cover. Figure 9 The backrest assembly 11 is shown in its designed position, combined with Figure 12 , Figure 15 , Figure 18 , Figure 21 , Figure 24 and Figure 27 As shown, at the designed position, roller 234 is located below the rear lifting linkage assembly 21, with a gap 24 between roller 234 and the rear lifting linkage assembly 21, allowing the rear lifting linkage assembly 21 to rotate around the front hinge point A; combined with Figure 10 and Figure 13 , Figure 16 and Figure 19 , Figure 22 and Figure 25 As shown, the backrest assembly 11 rotates rearward relative to the seat cushion 13 to a set angle. The backrest assembly 11 pulls the first actuating link 232 to rotate via the transmission link 22. The rotation of the first actuating link 232 drives the actuating shaft 231 and the second actuating link 233 to rotate, thereby causing the roller 234 to rotate around the rotation center of the actuating shaft 231, passing through a free travel segment formed by the gap 24, and then contacting the rear lifting link assembly 21; then combined with... Figure 11 and Figure 14 , Figure 17 and Figure 20 , Figure 23 , Figure 26 and Figure 28 As shown, the backrest assembly 11 rotates rearward relative to the seat cushion 13 to a reclined position. The backrest assembly 11 continues to pull the first actuating linkage 232 via the transmission linkage 22, causing the actuating shaft 231 and the second actuating linkage 233 to rotate together. This causes the roller 234 to continue rotating upward around the rotation center of the actuating shaft 231. During this process, the contact point between the roller 234 and the rear lifting linkage assembly 21 moves away from the rotation center of the rear lifting linkage assembly, pushing the rear lifting linkage assembly 21 upward. This causes the rear lifting linkage assembly 21 to rotate around the front hinge point A, achieving the upward lifting of the rear of the rear lifting linkage assembly 21. Figures 12 to 14 As shown, the position of the front seat 251 remains unchanged during the rear lifting process.

[0105] like Figures 29 to 31 As shown, in the second embodiment, the seat also includes a seat basin 253 disposed on the seat frame assembly 12. The front end of the seat basin 253 is rotatable relative to the seat frame assembly 12, and the rear end of the seat basin 253 is rotatably connected to the rear part of the rear lifting linkage assembly 21.

[0106] Thus, as the backrest assembly 11 rotates backward, the roller 234 rotates until it contacts the rear lifting linkage assembly 21, thereby pushing the rear lifting linkage assembly 21 to rotate upward around the front hinge point A. The lifting of the rear lifting linkage assembly 21 causes the rear end of the seat basin 253 to rotate upward around the front end.

[0107] The difference between this second embodiment and the first embodiment is that the seat 235 is a full-basin structure, while the front seat 251 of the first embodiment is a half-basin structure.

[0108] Furthermore, in the second embodiment, the seat basin 253 can be fitted onto the front connecting rod of the seat frame assembly 12 via a front hinge seat, and the size of the socket provided on the front hinge seat is larger than the size of the front connecting rod, so that the front end of the seat basin 253 can have a certain amount of horizontal displacement during the upward lifting process. The rear end of the seat basin 253 is fitted onto the lifting connecting rod 211 of the rear lifting connecting rod assembly 21 via a rear hinge seat.

[0109] like Figures 32 to 34 As shown, in the third embodiment, the front end of the seat 253 is connected to the front lifting mechanism via the front connecting seat 2531, and the rear end of the seat 253 is connected to the rear lifting linkage assembly 21 via the rear connecting seat 2532. The rear connecting seat 2532 is sleeved on the lifting linkage 211 of the rear lifting linkage assembly 21, and there can be a certain amount of play between the rear connecting seat 2532 and the lifting linkage 211.

[0110] The front lifting mechanism is located at the front of the seat frame assembly 12, and the front lifting mechanism can drive the front end of the seat basin 253 to lift upward.

[0111] The seat frame assembly 12 includes a pair of seat frame side plates 121 arranged opposite to each other. The front of the pair of seat frame side plates 121 is supported and connected to a front support tube 123. The two ends of the front support tube 123 are provided with connecting rod brackets. The front lifting mechanism includes a front connecting rod 311 and a lifting connecting rod 312. The two ends of the lifting connecting rod 312 are rotatably mounted on the corresponding connecting rod brackets of the front support tube 123. The two ends of the lifting connecting rod 312 are provided with lifting connecting pieces. The two ends of the front connecting rod 311 are provided with front connecting pieces. The front connecting pieces are rotatably connected to the corresponding lifting connecting pieces. The front connecting seat 2531 of the seat basin 253 is sleeved on the front connecting rod 311. There can be a certain amount of play between the front connecting seat 2531 and the front connecting rod 311. Play is provided at one of the positions between the front connecting seat 2531 and the front connecting rod 311 and between the rear connecting seat 2532 and the lifting connecting rod 211. The drive mechanism is mounted on the front support tube 123. The drive mechanism is telescopic and adjustable, and its telescopic drive end is connected to the lifting link 312. Figure 41 and Figure 42 As shown, when the drive mechanism extends forward, it pushes the lifting link 312 connected to it, causing the lifting link 312 to rotate upward around the connection between the lifting connecting piece and the link bracket. This, in turn, causes the front link 311 to rotate upward as well. The front link 311 pushes the front part of the seat basin 253 upward, achieving an upward lifting effect. Conversely, the drive mechanism can drive the front part of the seat basin 253 to rotate downward to return to the designed state. Preferably, the drive mechanism has a self-locking function, which allows the seat basin 253 to remain in the corresponding state, improving the stability of the seat cushion. The drive mechanism preferably includes a motor and a lead screw. The motor can be adjusted for extension and retraction by rotating the lead screw. The end of the lead screw is connected to the lifting link 312. During installation, the motor is mounted on an inner carrier that can rotate relative to the outer shell. The rotation of the inner carrier relative to the outer shell allows the lead screw to swing to a certain extent during the extension and retraction adjustment process, thereby driving the lifting link 311 to rotate upward.

[0112] like Figures 35 to 40 As shown, during the process of the backrest assembly 11 rotating backward from the designed position to the reclining position, the transmission link 22 drives the actuation component 23 to push the rear lifting link assembly 21 upward, thereby lifting the rear part of the seat basin 253 upward.

[0113] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A seat comprising a backrest assembly (11), a seat pan assembly (12) and a seat cushion rear lift mechanism provided between the backrest assembly (11) and the seat pan assembly (12), characterized in that, The seat cushion lifting mechanism includes: A rear lifting link assembly (21) is provided inside the seat frame assembly (12), and the front part of the rear lifting link assembly (21) is hinged to the seat frame assembly (12); A transmission link (22) is provided on the outside of the seat frame assembly (12), and the first connecting end of the transmission link (22) is hinged to the backrest assembly (11); A toggle assembly (23) is rotatably mounted on the seat frame assembly (12). The toggle assembly (23) is hinged to the second connecting end of the transmission link (22). The toggle assembly (23) includes a lifting drive end located inside the seat frame assembly (12). The lifting drive end is located below the rear lifting link assembly (21) and is configured to drive the toggle assembly (23) to rotate relative to the seat frame assembly (12) via the transmission link (22) when the backrest assembly (11) is rotated rearward for adjustment. This causes the lifting drive end to contact the rear lifting link assembly (21), and the contact point moves in a direction away from the rotation center of the rear lifting link assembly to lift the rear part of the rear lifting link assembly (21) upward.

2. The seat of claim 1, wherein When the seat is in the designed position, a gap (24) is formed between the lifting drive end and the rear lifting linkage assembly (21), the gap being configured such that: When the backrest assembly (11) is rotated forward for adjustment, the lifting drive end rotates away from the rear lifting linkage assembly (21), while the rear lifting linkage assembly (21) remains stationary. When the backrest assembly (11) is rotated backward for adjustment, the lifting drive end rotates toward the rear lifting linkage assembly (21), and the rear lifting linkage assembly (21) remains stationary before contacting the rear lifting linkage assembly (21).

3. The seat as described in claim 1 or 2, characterized in that, The seat frame assembly (12) includes seat frame side plates (121) disposed opposite to each other; The actuation assembly (23) includes an actuation shaft (231) rotatably mounted on the corresponding seat frame side plate (121), a first actuation link (232) fixedly connected to one end of the actuation shaft (231) and located outside the seat frame side plate (121), and a second actuation link (233) fixedly connected to the other end of the actuation shaft (231) and located inside the seat frame side plate (121); The end of the first actuating link (232) away from the actuating shaft (231) is hinged to the second connecting end of the transmission link (22); The lifting drive end is provided at the end of the second actuating link (233) away from the actuating shaft (231).

4. The seat as described in claim 3, characterized in that, A roller (234) is hinged to the end of the second actuating link (233) away from the actuating shaft (231); The roller (234) is the lifting drive end.

5. The seat of claim 1, wherein The seat frame assembly (12) includes a seat frame side plate (121) disposed opposite to each other, and a limiting frame (26) is provided on the inner side of the seat frame side plate (121); When the seat is in the designed position, the limiting bracket supports the rear of the rear lifting linkage assembly (21).

6. The seat of claim 5, wherein An elastic element is provided at the hinge of the front part of the rear lifting link assembly (21). One end of the elastic element is connected to the seat frame assembly, and the other end of the elastic element is connected to the rear lifting link assembly to apply a restoring elastic force to the rear lifting link assembly (21).

7. The seat of claim 1, wherein It also includes a front seat (251) disposed on the seat frame assembly (12) and a suspension spring (252) connected to the rear end of the front seat (251). The rear end of the suspension spring (252) is hooked to the rear part of the rear lift linkage assembly (21), so that the rear end of the suspension spring (252) can be lifted upward together with the rear part of the rear lift linkage assembly (21).

8. The seat of claim 1, wherein It also includes a seat basin (253) disposed on the seat frame assembly (12), the front end of the seat basin (253) being rotatable relative to the seat frame assembly (12), and the rear end of the seat basin (253) being rotatably connected to the rear part of the rear lifting linkage assembly (21).

9. The seat of claim 8, wherein, The front of the seat frame assembly (12) is provided with a front lifting mechanism; The front end of the basin (253) is rotatably connected to the front lifting mechanism, which can drive the front end of the basin (253) to lift upward.

10. The seat as claimed in claim 1, characterized in that, The rear lifting link assembly (21) includes a lifting link (211) and brackets (212) disposed at both ends of the lifting link (211); The front part of the bracket (212) is hinged to the seat frame assembly (12).

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