Seat backrest assembly

Abstract

The utility model relates to a seat backrest assembly which comprises a first backrest, a foot margin support, a second backrest and a lock assembly, and the first backrest and the second backrest which are connected in a pivoting mode relative to each other are installed on a vehicle floor through the foot margin support respectively. The lock assembly is disposed between the first backrest and the second backrest to lock the first backrest and the second backrest together and to separate the first backrest and the second backrest from each other after unlocking. According to the seat backrest assembly, linkage between unfolding and folding of the lock pin and overturning of the backrest can be achieved, the lock pin recycling function is achieved, when the seat backrest assembly is overturned forwards, the lock pin is recycled into the inner side of the backrest, 40 / 20 / 40 backrests can be assembled respectively, the weight is light, single-person operation can be achieved, packaging is reduced, and transportation cost is saved.

Description

Technical Field

[0001] The utility model relates to a vehicle seat, and more particularly to a seat backrest assembly. Background Art

[0002] With the development of vehicle technology, the personalized functions of vehicles are constantly evolving and improving. Vehicle seats are an important part of vehicles. To meet various personalized needs and adapt to different application scenarios, the flexibility and rationality of vehicle seats in terms of adjustment are also constantly improving and perfecting.

[0003] In the prior art, for a plurality of side-by-side seat backs, a function of locking and unlocking adjacent two seat backs together through a lock assembly is provided. How the deployment and retraction of the lock pin in the lock assembly are associated with the rotational movement of these two seat backs relative to each other has become an urgent problem to be solved. Summary of the Utility Model

[0004] To solve the problem of the association between the lock assembly and the backrest rotation in the above prior art, the utility model provides a seat backrest assembly.

[0005] The seat backrest assembly according to the utility model includes a first backrest, a floor bracket, a second backrest and a lock assembly. Among them, the first backrest and the second backrest pivotally connected to each other are respectively installed on the vehicle floor through the floor bracket, and the lock assembly is arranged between the first backrest and the second backrest to lock the first backrest and the second backrest together and separate the first backrest and the second backrest from each other after unlocking.

[0006] Preferably, the floor bracket includes a bracket assembly fixedly installed on the vehicle floor, and the bracket assembly is provided by a first bracket and a second bracket which are fixedly connected and spaced apart from each other. Among them, the first backrest is rotatably installed on the first bracket through a first backrest rotating shaft, and the second backrest is rotatably installed on the second bracket through a second backrest rotating shaft coaxially arranged with the first backrest rotating shaft.

[0007] Preferably, the floor bracket further includes a third bracket, and the third bracket is rotatably installed on the second bracket to define an open state and a closed state. In the open state, the second backrest is assembled to the notch area of the second bracket, and the third bracket is fastened to the second bracket to prevent the second backrest from disengaging from the floor bracket in the closed state.

[0008] Preferably, the second bracket is provided with a special-shaped hole, and the second backrest rotating shaft is provided with a flange matching the shape of the special-shaped hole. When the flange is in an aligned state with the special-shaped hole, the second backrest can be assembled to the second bracket, and when the flange is in a misaligned state with the special-shaped hole, it can prevent the second backrest from disengaging from the floor bracket.

[0009] Preferably, the lock assembly includes a cable assembly and a lock assembly that cooperate with each other. Among them, the cable assembly is installed on the first backrest and includes a lock pin that moves between an unfolded state and a folded state. The lock assembly is installed on the second backrest, and the lock pin cooperates with the lock assembly in the unfolded state to define a locked state.

[0010] Preferably, the cable assembly further includes a return torsion spring and a cable. Among them, the return torsion spring applies a biasing force to the lock pin to move it towards the folded state, and the cable applies a force to the lock pin to resist the biasing force applied to the lock pin by the return torsion spring.

[0011] Preferably, the cable assembly further includes a drive turntable rotatably installed on the first backrest rotation shaft. One end of the cable is connected to the drive turntable to wind and unwind on the drive turntable, and the other end of the cable is connected to the lock pin and can drive the lock pin to change from the folded state to the unfolded state.

[0012] Preferably, the second backrest has a stop pin, which cooperates with the drive turntable to overcome the acting force applied by the drive turntable in the first direction, thereby serving as a limiting mechanism for restricting the rotation of the drive turntable in the first direction, where the first direction corresponds to the direction in which the cable is wound onto the drive turntable.

[0013] Preferably, the stop pin is arranged parallel to the second backrest rotation shaft and protrudes towards the first backrest.

[0014] Preferably, the first backrest, the floor foot bracket and the cable assembly are pre-assembled to form a first backrest assembly, and the second backrest and the lock assembly are pre-assembled to form a second backrest assembly.

[0015] According to the seat backrest assembly of the present invention, the unfolding and folding of the lock pin can be linked with the flipping of the backrest, and the lock pin recovery function can be realized. When flipping forward and lying flat, the lock pin is recovered into the inner side of the backrest. According to the seat backrest assembly of the present invention, the 40 / 20 / 40 backrests can be assembled separately, with light weight, can be operated by one person, reduce packaging and save transportation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an exploded view of a seat backrest assembly according to a preferred embodiment of the present invention.

[0017] Figure 2 is an overall assembly schematic diagram of a seat backrest assembly according to a preferred embodiment of the present invention.

[0018] Figure 3 is Figure 1 the assembly schematic diagram of the floor foot bracket.

[0019] Figure 4 shows Figure 3 the closed state and the open state of the floor foot bracket.

[0020] Figure 5 Show Figure 1 Assembly schematic diagram of the cable assembly on the first backrest.

[0021] Figure 6 Show Figure 5 The limit structure of the drive turntable.

[0022] Figure 7 Is Figure 5 Partial exploded view of the cable assembly.

[0023] Figure 8 Show Figure 1 Assembly schematic diagram of the lock assembly on the second backrest.

[0024] Figures 9 - 11 Show Figure 8 The second backrest of Figure 3 Z-direction installation on the floor bracket of

[0025] Figure 12 Show Figure 1 Design state of the seat backrest assembly.

[0026] Figure 13 Show Figure 1 Flattened state of the seat backrest assembly.

[0027] Figure 14 Show Figure 1 Transition state when the stop pin just leaves the drive turntable during the forward flipping of the second backrest of the seat backrest assembly.

[0028] Figure 15 Show Figure 1 Flattened state of the second backrest of the seat backrest assembly.

[0029] Figure 16 Assembly schematic diagram of the floor bracket according to another preferred embodiment of the present invention.

[0030] Figure 17 Assembly schematic diagram of the lock assembly on the second backrest according to another preferred embodiment of the present invention.

[0031] Figures 18 - 20 Show Figure 16 The second backrest of Figure 16 Y-direction installation on the floor bracket of Detailed implementation mode

[0032] The following combines the accompanying drawings to give a preferred embodiment of the present invention and describes it in detail.

[0033] Embodiment 1

[0034] AsFigure 1 As shown, the seat backrest assembly according to this embodiment includes a first backrest 1, a floor bracket 2, a second backrest 3, and a lock assembly 4. Among them, the first backrest 1 and the second backrest 3 pivotally connected to each other are respectively installed on the vehicle floor through the floor bracket 2. The lock assembly 4 is disposed between the first backrest 1 and the second backrest 3 to lock the first backrest 1 and the second backrest 3 together and enable the first backrest 1 and the second backrest 3 to be separated from each other after unlocking. As Figure 2 shown, the seat backrest assembly may further include a third backrest 1'. The first backrest 1 is a 40-backrest, the second backrest 3 is a 20-backrest adjacent to the 40-backrest, and the third backrest 1' is another 40-backrest adjacent to the 20-backrest.

[0035] As Figures 3 - 4 shown, the floor bracket 2 includes a first bracket 21, a second bracket 22, and a third bracket 23. Among them, the first bracket 21 and the second bracket 22 are fixedly connected (such as welded) to each other at intervals to form a bracket assembly. This bracket assembly is fixedly installed on the vehicle floor in an upward-open structure. The first backrest 1 is rotatably installed on the first bracket 21 through a first backrest rotating shaft 1a (see Figure 1 and Figure 5 ), and the second backrest 3 is rotatably installed on the second bracket 22 through a second backrest rotating shaft 3a coaxially arranged with the first backrest rotating shaft 1a (see Figure 1 ). The third bracket 23 is rotatably installed on the second bracket 22 through, for example, a rivet 24 so as to be rotatable above the second bracket 22 in the closed state. In this embodiment, a first bushing 21a is installed on the first bracket 21 to facilitate the insertion of the first backrest rotating shaft 1a therein for cooperation to reduce the rotational friction between the shaft and the hole and reduce noise and vibration. A first half-bushing 22a is installed on the second bracket 22, and a second half-bushing 23a is installed on the third bracket 23. The first half-bushing 22a and the second half-bushing 23a form a second bushing in the closed state to facilitate the insertion of the second backrest rotating shaft 3a therein for cooperation to reduce the rotational friction between the shaft and the hole and reduce noise and vibration.

[0036] As Figure 1 shown, the lock assembly 4 includes a cable assembly 41 and a lock assembly 42 that cooperate with each other. Among them, the cable assembly 41 is installed on the first backrest 1 through, for example, a mounting bolt (see Figure 5 ), and the lock assembly 42 is installed on the second backrest 3 through, for example, a mounting bolt (see Figure 8 ). It should be understood that the installation positions of the cable assembly 41 and the lock assembly 42 are only exemplary, and the installation positions of the two can be interchanged, that is, the lock assembly 42 can be installed on the first backrest 1, and the cable assembly 41 can be installed on the second backrest 3, as long as the installation positions of the corresponding other parts fixed on the corresponding backrests are also interchanged.

[0037] As shown Figures 5 - 7 in FIG. 1, the cable assembly 41 includes a housing 411, a locking pin 412, a return torsion spring 413, a cable 414, and a driven turntable 415. Among them, the housing 411 is mounted to the first backrest 1 through mounting bolts. The locking pin 412 moves relative to the housing 411 between an extended state and a folded state to cooperate with the locking assembly 42 in the extended state to define a locked state. The two ends of the return torsion spring 413 are respectively connected to the housing 411 and the locking pin 412 to apply a biasing force to the locking pin 412 to make it move towards the folded state. The cable 414 applies a force to the locking pin 412 through the driven turntable 415 to resist the biasing force applied by the return torsion spring 413 to the locking pin 412, thereby driving the locking pin 412 to change from the folded state to the extended state. In this embodiment, the locking pin 412 is rotatably mounted on the housing 411 through a locking pin rotating shaft 412a. The return torsion spring 413 is sleeved on the locking pin rotating shaft 412a. The driven turntable 415 is coaxially and torsionally resistant mounted on the locking pin 412 through a hole portion 415a that is shape-fitted with the locking pin rotating shaft 412a. Specifically, the cable 414 is connected to the driven turntable 415 deviating from the rotation axis of the driven turntable 415, so that the pulling force applied by the cable 414 to the driven turntable 415 can drive the locking pin 412 to rotate towards the extended direction against the biasing force of the return torsion spring 413.

[0038] As shown Figure 5 in FIG. 2, the cable assembly 41 further includes a driving turntable 416 rotatably mounted on the first backrest rotating shaft 1a. The cable 414 is connected to the driving turntable 416 to wind and unwind on the driving turntable 416, so that the winding of the cable 414 on the driving turntable 416 can make the cable 414 tend to tighten and increase the force applied by the cable 414 to the locking pin 412, while the unwinding of the cable 414 on the driving turntable 416 can make the cable 414 tend to relax and decrease the force applied by the cable 414 to the locking pin 412. As shown Figure 6 in FIG. 3, a connecting bracket 1b is fixed on the first backrest 1. It is used to define the initial position of the driving turntable 416 to facilitate the installation of the rotating shaft of the second backrest 3, and is also used to fix the cable joint to facilitate the winding and unwinding of the cable 414 on the driving turntable 416.

[0039] As shown Figure 8 in FIG. 4, the second backrest 3 has a stop pin 31, which is arranged parallel to the second backrest rotating shaft 3a and extends towards the first backrest 1. The stop pin 31 cooperates with the driving turntable 416 to overcome the acting force applied by the driving turntable 416 in the first direction, so as to be used as a limiting mechanism for restricting the rotation of the driving turntable 416 in the first direction, where the first direction corresponds to the direction in which the cable 414 is wound onto the driving turntable 416.

[0040] As shown Figure 5As shown, the first backrest 1, the floor bracket 2 and the cable assembly 41 are pre-assembled to form the first backrest assembly. As Figure 8 shown, the second backrest 3 and the lock assembly 42 are pre-assembled to form the second backrest assembly, thereby enabling separate supply, transportation and assembly of the 40 / 20 / 40 backrest. As Figure 9 and Figure 10 shown, during assembly, the third bracket 23 of the floor bracket 2 is turned over so that it can rotate freely around the rivet 24. After the second backrest shaft 3a of the second backrest 3 is directly inserted into the notch area 22b of the second bracket 22 from top to bottom, as Figure 11 shown, then the third bracket 23 is closed and the mounting bolt 23b is tightened to complete the assembly of the backrest assembly.

[0041] As Figure 12 shown, the first backrest 1 and the second backrest 3 are in the designed state. In this designed state, the locking pin 412 is in the deployed state, and the first backrest 1 and the second backrest 3 can be locked together through the locking pin 412. Since the force applied by the cable 414 to the locking pin 412 resists the biasing force applied by the return torsion spring 413 to the locking pin 412, the cable 414 is in a taut state. The stop pin 31 and the drive turntable 416 are in contact with each other, and since the cable 414 is in a taut state, the drive turntable 416 applies a force to the stop pin 31, and the stop pin 31 prevents the drive turntable 416 from rotating in the direction that causes the cable 414 to unwind, so that the cable 414 can be kept in a taut state to hold the locking pin 412 in the deployed position.

[0042] From Figure 12 the designed state, the first backrest 1 is flipped forward through the first backrest shaft 1a, and at the same time the second backrest 3 is flipped forward through the second backrest shaft 3a, and can be flipped to Figure 13 the flattened state shown. In this flattened state, the locking pin 412 is in the deployed state, and the first backrest 1 and the second backrest 3 can be locked together through the locking pin 412. The return torsion spring 413, the cable 414, the drive turntable 416 and the stop pin 31 are all the same as those in Figure 12 the designed state.

[0043] From Figure 12 the designed state, the first backrest 1 remains fixed relative to the designed state, and the second backrest 3 is flipped forward relative to the first backrest 1, as Figure 14It is shown more clearly that as the second backrest 3 rotates forward relative to the first backrest 1, the stop pin 31 on the second backrest 3 rotates clockwise around the second backrest rotating shaft 3a together with the second backrest 3. During this process, the stop pin 31 has a tendency to move away from the driving turntable 416, while the cable 414 has a tendency to unwind from the driving turntable 416 due to the acting force of the return torsion spring 413, so that the driving turntable 416 has a tendency to rotate clockwise. This causes the driving turntable 416 to rotate following the stop pin 31 and maintain a state of contact with the stop pin 31 until the locking pin 412 reaches the folding position and the return torsion spring 413 no longer applies a biasing force to the driving turntable 416 via the cable 414. Therefore, the state where the locking pin 412 reaches the folding position can correspond to the transitional state where the first backrest 1 and the second backrest 3 reach as shown in Figure 14 or can also correspond to the state where the driving turntable 416 no longer applies a force to the stop pin 31. On this basis, when the second backrest 3 is further rotated forward, the return torsion spring 413 no longer applies a biasing force to the locking pin 412. The locking pin 412 maintains the folded state and no longer provides a force to make the cable 414 taut to the cable 414. The driving turntable 416 no longer rotates following the stop pin 31, so that it can gradually separate from the stop pin 31 until the second backrest 3 reaches the flat state as shown in Figure 15 .

[0044] Embodiment 2

[0045] Parts that are the same as those in Embodiment 1 will not be described herein again. Different from Embodiment 1, as shown in Figure 16 , the floor bracket 2 includes a first bracket 21 and a second bracket 22, and does not include a third bracket. An irregular hole 22b' is provided on the second bracket 22. As shown in Figure 17 , a flange 3b matching the shape of the irregular hole 22b' is provided on the second backrest rotating shaft 3a' of the second backrest 3. During assembly, as shown in Figure 18 , the second backrest 3 is first rotated forward to a specific angle range. After roughly aligning the flange 3b with the irregular hole 22b', as shown in Figure 19 , it is inserted into the floor bracket 2 in the Y direction. As shown in Figure 20 , the second backrest 3 is turned up to the designed position to stagger the flange 3b from the irregular hole 22b' by a certain angle to prevent the flange 3b from disengaging from the irregular hole 22b', thus completing the assembly of the backrest assembly.

[0046] Obviously, the locking pin 412 of the locking component 4 of the seat backrest component according to the present utility model folds as the first backrest 1 and the second backrest 3 rotate and separate relative to each other, and unfolds as the first backrest 1 and the second backrest 3 rotate and approach relative to each other. Thus, it can not only achieve the locking function when the first backrest 1 and the second backrest 3 approach, but also avoid colliding with objects such as occupants and luggage due to protruding from the seat backrest when the first backrest 1 and the second backrest 3 separate, affecting the riding experience. In particular, the seat backrest component according to the present utility model is directed to a seat structure type with a separate seat and backrest, applicable to a locking backrest, and is supplied in the form of 40 / 20 / 40, avoiding damage to the shaft-hole fit during transportation and reducing transportation costs at the same time.

[0047] The above are only the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various changes can be made to the above embodiments of the present utility model. That is, all simple, equivalent changes and modifications made according to the claims and the content of the specification of the present utility model application fall within the scope of the claims of the present utility model patent. Those not described in detail in the present utility model are all conventional technical contents.

Claims

1. A seat back assembly, characterized in that, The seat back assembly includes a first backrest, a floor bracket, a second backrest, and a locking assembly. Among them, the first backrest and the second backrest pivotally connected to each other are respectively mounted on the vehicle floor through the floor bracket. The locking assembly is disposed between the first backrest and the second backrest to lock the first backrest and the second backrest together and to separate the first backrest and the second backrest from each other after unlocking.

2. The seat back assembly according to claim 1, wherein, The floor bracket includes a bracket assembly fixedly mounted on the vehicle floor, and the bracket assembly is provided by a first bracket and a second bracket which are fixedly connected and spaced apart from each other. Among them, the first backrest is rotatably mounted on the first bracket through a first backrest rotating shaft, and the second backrest is rotatably mounted on the second bracket through a second backrest rotating shaft coaxially arranged with the first backrest rotating shaft.

3. The seat back assembly according to claim 2, wherein, The floor bracket further includes a third bracket, and the third bracket is rotatably mounted on the second bracket to define an open state and a closed state. In the open state, the second backrest is assembled to the notch area of the second bracket, and the third bracket is fastened to the second bracket to prevent the second backrest from disengaging from the floor bracket in the closed state.

4. The seat back assembly according to claim 2, characterized in that, The second bracket is provided with a special-shaped hole, and the second backrest rotating shaft is provided with a flange matching the shape of the special-shaped hole. When the flange is in an aligned state with the special-shaped hole, the second backrest can be assembled to the second bracket. When the flange is in a misaligned state with the special-shaped hole, it can prevent the second backrest from disengaging from the floor bracket.

5. The seat back assembly according to claim 1, characterized in that, The locking assembly includes a cable assembly and a lock assembly that cooperate with each other. Among them, the cable assembly is mounted on the first backrest and includes a lock pin that moves between an extended state and a retracted state. The lock assembly is mounted on the second backrest, and the lock pin cooperates with the lock assembly in the extended state to define a locked state.

6. The seat back assembly according to claim 5, characterized in that, The cable assembly further includes a return torsion spring and a cable. Among them, the return torsion spring applies a biasing force to the lock pin to make it move towards the retracted state, and the cable applies a force to the lock pin to resist the biasing force applied to the lock pin by the return torsion spring.

7. The seat back assembly according to claim 6, characterized in that, The cable assembly further includes a driving turntable rotatably mounted on the first backrest rotating shaft. One end of the cable is connected to the driving turntable to wind and unwind on the driving turntable, and the other end of the cable is connected to the lock pin and can drive the lock pin to change from the retracted state to the extended state.

8. The seat back assembly according to claim 7, characterized in that, The second backrest has a stop pin, and the stop pin cooperates with the driving turntable to overcome the acting force applied by the driving turntable in the first direction, so as to be used as a limiting mechanism for restricting the driving turntable from rotating in the first direction. Among them, the first direction corresponds to the direction in which the cable is wound onto the driving turntable.

9. The seat back assembly according to claim 8, wherein The stop pin is arranged parallel to the second backrest rotating shaft and extends towards the first backrest.

10. The seat back assembly according to claim 5, characterized in that, The first backrest, the floor bracket, and the cable assembly are pre-assembled to form a first backrest assembly, and the second backrest and the lock assembly are pre-assembled to form a second backrest assembly.

Images