Synchronous keeping mechanism for front and rear connecting rods

Abstract

The utility model discloses a front connecting rod and rear connecting rod synchronous keeping mechanism which comprises a base, a seat cushion framework located above the base, a front connecting rod and a rear connecting rod, the front connecting rod and the rear connecting rod are arranged between the seat cushion framework and the base, and the upper end and the lower end of the front connecting rod are rotationally connected to the front end of the seat cushion framework and the base respectively. The upper and lower ends of the rear connecting rod are rotationally connected to the rear end of the cushion framework and the base; a first locking assembly is arranged at the position, corresponding to the rotating connection position of the rear connecting rod, of the cushion framework, and a second locking assembly is arranged between the front connecting rod and the base. A driving mechanism is arranged between the cushion framework and the front connecting rod and is used for driving the cushion framework to rotate relative to the front connecting rod; a retaining assembly is arranged on the base and used for enabling the rear connecting rod and the front connecting rod to keep synchronous movement. The seat cushion has the advantages that the rear connecting rod can be fixedly supported on the base when the seat cushion framework is overturned forwards, and meanwhile movement interference cannot be caused to forward movement adjustment of the seat cushion framework in the sitting posture state.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile seats, in particular to a front and rear connecting rod synchronization maintaining mechanism. Background Art

[0002] With the increasing demand for long-distance travel and camping, users have higher and higher requirements for the comfort of resting in the car. Therefore, relevant companies are actively developing technologies that can directly transform seats into beds. The current concept is mainly to set the backrest into a double-layer structure. By flipping the seat cushion forward 180 degrees, the backrest is folded forward as a whole and flush with the flipped seat cushion, and then the upper backrest is flipped backward and expanded 180 degrees, so as to realize the conversion of the seat from sitting mode to lying mode.

[0003] At the same time, in order to achieve backrest angle adjustment in a sitting position, the seat cushion also has an overall forward movement function, thereby leaving space for the lower part of the backrest to facilitate backrest angle adjustment. To this end, the applicant intends to respectively arrange a front link and a rear link between the front and rear ends of the seat cushion and the base, so that the seat cushion, the front link, the base, and the rear link form a four-bar linkage mechanism that is sequentially hinged. A drive mechanism is provided between the seat cushion and the front link, and a lock is provided at the rear end of the seat cushion. The lock can switch the seat cushion between maintaining a rotational connection with the upper end of the rear link and releasing the connection. When the seat cushion maintains a rotational connection with the upper end of the rear link, the drive mechanism drives the seat cushion to rotate, which can drive the four-bar linkage mechanism to move, achieving forward movement of the seat cushion. After the seat cushion is released from the upper end of the rear link, the drive mechanism can drive the seat cushion to flip forward relative to the front link.

[0004] However, in this development process, when the seat cushion flips forward relative to the front link, the lower end of the rear link and the base are pivotally connected. At this point, the rear link is no longer fixedly supported on the base and rotates relative to the base. When the seat cushion rotates back from front to back to the sitting position, the rear end of the seat cushion cannot mate with the upper end of the rear link. Therefore, the four-bar linkage consisting of the seat cushion, front link, base, and rear link lacks a retaining mechanism that can securely support the rear link to the base when the seat cushion flips forward while preventing movement interference with the forward movement of the seat cushion in the sitting position. Summary of the Invention

[0005] In view of this, the present invention provides a front and rear connecting rod synchronization maintaining mechanism to meet the technical requirements proposed in the background technology.

[0006] To achieve the above purpose, the technical solution of this utility model is as follows:

[0007] A front and rear link synchronization maintaining mechanism, the key of which is: it includes a base, a seat cushion frame located above the base, and a front link and a rear link arranged between the seat cushion frame and the base, the upper and lower ends of the front link are respectively rotatably connected to the front end of the seat cushion frame and the base, and the upper and lower ends of the rear link are respectively rotatably connected to the rear end of the seat cushion frame and the base; the seat cushion frame is provided with a first locking assembly at a position corresponding to the rotational connection of the rear link, the first locking assembly is used to switch the seat cushion frame between maintaining a rotational connection with the rear link and releasing the connection, the front link is provided with a second locking assembly between the front link and the base, and the second locking assembly is used to switch the front link between maintaining a rotational connection with the base and a fixed connection; a driving mechanism is provided between the seat cushion frame and the front link, the driving mechanism is used to drive the seat cushion frame to rotate relative to the front link;

[0008] A retaining assembly is provided on the base, and the retaining assembly is used to keep the rear connecting rod and the front connecting rod moving synchronously.

[0009] With the above structure, in the sitting position, the first locking assembly maintains the rear end of the seat cushion frame in rotational connection with the upper end of the rear link, the second locking assembly maintains the lower end of the front link in rotational connection with the base, and the retaining assembly enables the rear link to rotate synchronously with the front link. At this point, under the self-locking restraint of the drive mechanism, the front link, base, rear link, and seat cushion frame form a stable four-bar linkage, stably supporting the seat cushion frame on the base. When the seat back angle needs to be adjusted, the drive mechanism rotates the seat cushion frame relative to the front link, thereby driving the four-bar linkage, thereby moving the seat cushion frame forward and exposing the space behind the seat cushion frame. This ensures that in the sitting position, the backrest angle adjustment is not obstructed by the rear end of the seat cushion. The first locking assembly releases the connection between the seat cushion frame and the rear link. Driven by the drive mechanism, the rear end of the seat cushion frame moves upward away from the upper end of the rear link, allowing the seat cushion frame to flip forward and flatten relative to the front link. At the same time, the second locking assembly fixes the lower end of the front link to the base, and the retaining assembly keeps the rear link synchronized and stationary with the front link, ensuring that when the seat frame flips backward to a horizontal state again, the first locking assembly can accurately dock with the rear link.

[0010] Preferably: the retaining assembly includes a first gear and a second gear rotatably mounted on the base, the lower end of the front connecting rod is provided with a first arc-shaped tooth portion meshing with the first gear, the lower end of the rear connecting rod is provided with a second arc-shaped tooth portion meshing with the second gear, the lower end of the first gear has a first extension portion extending downward, the lower end of the second gear has a second extension portion extending downward, a synchronization rod is provided between the lower parts of the first extension portion and the second extension portion, and both ends of the synchronization rod are rotatably connected to the lower part of the first extension portion and the lower part of the second extension portion respectively.

[0011] Preferably, a latch is fixedly provided at the upper end of the rear connecting rod, and the first locking assembly can buckle the latch or release the latch.

[0012] Preferably, the second locking assembly includes a locking frame fixed on the base, a locking rod located above the locking frame, and a zipper connected between the locking frame and the locking rod. The lower end of the front connecting rod is rotatably connected to the locking frame, the middle part of the locking rod is hinged to the front connecting rod, a locking notch is provided at one end of the locking frame, and a clamping portion adapted to the locking notch is provided at one end of the locking rod. The zipper is used to clamp the clamping portion in the locking notch, or to move the clamping portion upward away from the locking notch.

[0013] Preferably, the distal end of the zipper is connected to a manual traction mechanism or an electric traction device.

[0014] Preferably, the front connecting rod, rear connecting rod, first locking assembly and retaining assembly are each provided with two groups, and correspond one to one. The two groups of front connecting rods are respectively arranged on both sides of the front end of the seat cushion frame, and the two groups of rear connecting rods are respectively arranged on both sides of the rear end of the seat cushion frame.

[0015] Preferably, a torsion spring is provided between the rear connecting rod and the base.

[0016] Preferably, the driving mechanism is an electric angle adjuster.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The present invention employs a front-to-rear link synchronization retention mechanism. When the seat frame is tilted forward, the second locking assembly secures the front link. Under the synchronizing action of the retention assembly, the rear link remains stationary with the front link, ensuring that the first locking assembly precisely engages the rear link when the seat frame is tilted back to a horizontal position. In the sitting position, the retention assembly allows the rear link to rotate synchronously with the front link without affecting the four-link structure consisting of the front link, base, rear link, and seat frame, thereby ensuring that the fore-and-aft adjustment function of the seat frame is not affected.

[0019] 2. The front and rear connecting rod synchronization holding mechanism provided by the utility model does not need to separately set up a locking mechanism between the rear connecting rod and the base. The synchronous transmission is performed by the holding component, so that the connection state of the rear connecting rod and the base can be synchronized with the front connecting rod. That is, when the front connecting rod is fixedly connected to the base, the rear connecting rod is also fixedly connected to the base. When the front connecting rod rotates relative to the base, the rear connecting rod can also rotate relative to the base. At the same time, such a structural design can also reduce the subsequent maintenance cost, and has the technical advantages of energy saving and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1The right side view of the front and rear link synchronization mechanism;

[0021] Figure 2 This is a schematic diagram of the structure of the front and rear link synchronization maintenance mechanism (the synchronization rod F3 is hidden);

[0022] Figure 3 It is a right side view of the front and rear connecting rod synchronization maintaining mechanism when the seat cushion frame 2 is flipped forward;

[0023] Figure 4 Schematic diagram of the structure of the first locking assembly C;

[0024] Figure 5 A schematic diagram showing the connection relationship between the second locking assembly D, the base 1 and the front connecting rod 3;

[0025] Figure 6 This is a reference diagram of the usage status of the front and rear link synchronization maintenance mechanism. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0027] Please refer to Figure 1 , a front and rear link synchronization maintaining mechanism, which includes a base 1 and a seat cushion frame 2 arranged above the base 1, a front link 3 and a rear link 4 are provided between the seat cushion frame 2 and the base 1, wherein the upper and lower ends of the front link 3 are respectively rotatably connected to the front end of the seat cushion frame 2 and the base 1, and the upper and lower ends of the rear link 4 are respectively rotatably connected to the rear end of the seat cushion frame 2 and the base 1. The seat cushion frame 2 is provided with a first locking component C at a position corresponding to the rotational connection of the rear link 4, and the first locking component C can switch the seat cushion frame 2 between maintaining a rotational connection with the rear link 4 and releasing the connection. A second locking component D is provided between the front link 3 and the base 1, and the second locking component D can switch the front link 3 between maintaining a rotational connection with the base 1 and a fixed connection. A holding component F is provided on the base 1, and the holding component F can keep the rear link 4 and the front link 3 in synchronous movement. By Figure 5 It can be seen that a driving mechanism 5 is provided between the seat frame 2 and the front connecting rod 3, and the driving mechanism 5 is used to drive the seat frame 2 to rotate relative to the front connecting rod 3. In this embodiment, the driving mechanism 5 is an electric recliner, which can drive the seat frame 2 to rotate relative to the front connecting rod 3 by controlling the electric recliner through a motor.

[0028] Based on the above structural design, the front and rear link synchronization holding mechanism is applied to the seat that can be transformed into a bed. In the sitting mode, the first locking component C keeps the rear end of the seat cushion frame 2 in rotational connection with the upper end of the rear link 4, and the second locking component D keeps the lower end of the front link 3 in rotational connection with the base 1. The holding component F enables the rear link 4 to rotate synchronously with the front link 3. At this time, under the self-locking restriction of the driving mechanism 5, the front link 3, the base 1, the rear link 4 and the seat cushion frame 2 form a stable four-link mechanism, and the seat cushion frame 2 can be stably supported on the base 1. When it is necessary to adjust the angle of the seat back, the driving mechanism 5 drives the seat cushion frame 2 to rotate relative to the front link 3, which can drive the four-link mechanism to move, thereby realizing the forward movement of the seat cushion frame 2 and exposing the rear space of the seat cushion frame 2 to ensure that in the sitting state, the backrest inclination adjustment is not blocked or interfered with by the rear end of the seat cushion. When the seat needs to be transformed into a bed, refer to Figure 3 The first locking assembly C releases the connection between the seat cushion frame 2 and the rear link 4. Driven by the driving mechanism 5, the rear end of the seat cushion frame 2 can move upward and away from the upper end of the rear link 4, allowing the seat cushion frame 2 to flip forward and flat around the front link 3. At the same time, the second locking assembly D securely connects the lower end of the front link 3 to the base 1, providing strong support for the flipping of the seat cushion frame 2. The retaining assembly F keeps the rear link 4 synchronously stationary with the front link 3, ensuring that when the seat cushion frame 2 flips back to a horizontal position again, the first locking assembly C can accurately engage the rear link 4, ensuring the feasibility of switching back and forth between the sitting position and the lying position.

[0029] Further, refer to Figure 1 and 2 The holding assembly F includes a first gear F1 and a second gear F2 that are respectively rotatably mounted on the base 1. The lower end of the front connecting rod 3 is provided with a first arc-shaped tooth portion a that meshes with the first gear F1, and the lower end of the rear connecting rod 4 is provided with a second arc-shaped tooth portion b that meshes with the second gear F2. The lower end of the first gear F1 has a first extension portion F11 extending downward, and the lower end of the second gear F2 has a second extension portion F21 extending downward. A synchronization rod F3 is provided between the lower parts of the first extension portion F11 and the second extension portion F21, and the two ends of the synchronization rod F3 are respectively rotatably connected to the lower parts of the first extension portion F11 and the second extension portion F21.

[0030] With this design, when the seat cushion frame 2 needs to be flipped forward, the second locking assembly D securely connects the lower end of the front link 3 to the base 1, i.e., the first arcuate tooth portion a at the lower end of the front link 3 remains fixedly engaged with the first gear F1. Under the synchronous action of the synchronization rod F3, the second arcuate tooth portion b at the lower end of the rear link 4 also remains fixedly engaged with the second gear F2, thereby locking the rear link 4 relative to the base 1. On the other hand, when the seat is in the sitting position, the second locking assembly D maintains a rotational connection between the lower end of the front link 3 and the base 1. The drive mechanism 5 drives the seat cushion frame 2 to rotate relative to the front link 3, which in turn drives the lower end of the front link 3 to rotate. This rotation drives the first gear F1 to rotate about the base 1. Under the synchronous transmission action of the synchronization rod F3, this in turn drives the second gear F2 and the lower end of the rear link 4 to rotate, thereby achieving the forward movement function of the seat cushion frame 2.

[0031] In the above structural design, the functions of the retaining component F are: 1. After the first locking component C is unlocked, the seat cushion frame 2 flips forward. Under the action of the retaining component F, the rear link 4 can remain motionless, ensuring that when the seat cushion frame 2 flips backward to a horizontal state again, the first locking component C can accurately dock with the upper end of the rear link 4; 2. In the sitting mode, when the driving mechanism 5 drives the seat cushion frame 2 to move forward for adjustment, the retaining component F adopts the above transmission structure, and will not affect the four-bar structure composed of the front link 3, base 1, rear link 4 and seat cushion frame 2, thereby ensuring that the seat cushion frame 2 can realize the front and rear adjustment function; 3. Through the meshing self-locking effect between the gears, in the locked state, the stability of the fixed support of the front link 3 and the rear link 4 can be improved; in the unlocked state, through gear transmission, it has the technical advantages of high transmission efficiency and high movement accuracy.

[0032] refer to Figure 1 In this embodiment, a torsion spring 7 is provided between the lower end of the rear link 4 and the base 1. The torsion spring 7 can eliminate the gap between the lower end of the rear link 4 and the base 1, thereby improving the stability of the overall structure.

[0033] like Figure 1 and Figure 3 As shown, a latch 6 is fixed to the upper end of the rear link 4. The latch 6 is perpendicular to the rear link 4 and extends toward the first locking assembly C. The first locking assembly C can engage or release the latch 6. When the first locking assembly C engages the latch 6, the latch 6 and the first locking assembly C maintain a rotational connection, that is, the upper end of the rear link 4 and the rear end of the seat cushion frame 2 maintain a rotational connection. When the first locking assembly C releases the latch 6, the connection between the first locking assembly C and the latch 6 is released, that is, the connection between the rear end of the seat cushion frame 2 and the upper end of the rear link 4 is released.

[0034] For example Figure 4As shown, in this embodiment, the first locking assembly C utilizes a floor lock structure, comprising a base C3 fixedly mounted at the rear end of the seat cushion frame 2. A locking hook C1 and an unlocking component C2, which controls the rotation of the locking hook C1, are rotatably mounted on the base C3. In the locked state, the locking hook C1 engages with the latch 6, maintaining a rotational connection with the rear end of the seat cushion frame 2. To unlock, the unlocking component C2 pulls the locking hook C1, rotating it and releasing the latch 6, allowing the rear end of the seat cushion frame 2 to move upward away from the latch 6. Floor locks are a mature technology in automotive seat technology and will not be discussed in detail here.

[0035] Please refer to Figure 5 The second locking assembly D includes a locking frame D1, a locking rod D2 located above the locking frame D1, and a zipper D3 connected between the locking frame D1 and the locking rod D2. The locking frame D1 is fixedly assembled on the base 1, the lower end of the front link 3 is rotatably connected to the locking frame D1, and the middle portion of the locking rod D2 is hinged to the front link 3. A locking notch a is provided at one end of the locking frame D1, and a downwardly extending clamping portion b is provided at one end of the locking rod D2, which is adapted to the locking notch a. When the second locking assembly D is locked, the clamping portion b of the locking rod D2 is clamped downwardly on the locking notch a. At this time, the locking frame D1, the locking rod D2, and the front link 3 form a stable triangular structure, and the front link 3 can be fixedly supported on the base 1. When unlocking, the locking rod D2 is pulled downward by the zipper D3, and the clamping portion b can be moved upward away from the locking notch a. At this time, the lower end of the front link 3 can maintain a rotatable connection with the base 1. In this embodiment, the distal end of the zipper D3 is connected to a manual traction mechanism or an electric traction device, through which the lock rod D2 can be manually or electrically controlled to rotate around the first connecting rod B1.

[0036] refer to Figure 6 In this embodiment, the front link 3, the rear link 4, the first locking assembly C and the retaining assembly F are each provided with two groups, and correspond one to one. The two groups of front links 3 are respectively arranged on both sides of the front end of the seat cushion frame 2, and the two groups of rear links 4 are respectively arranged on both sides of the rear end of the seat cushion frame 2. The second locking assembly D is arranged on the inner side of one of the groups of front links 3.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention. Such changes fall within the scope of protection of the present invention.

Claims

1. A front and rear connecting rod synchronization maintaining mechanism, characterized by: The invention comprises a base (1), a seat frame (2) located above the base (1), and a front connecting rod (3) and a rear connecting rod (4) arranged between the seat frame (2) and the base (1), wherein the upper and lower ends of the front connecting rod (3) are respectively rotatably connected to the front end of the seat frame (2) and the base (1), and the upper and lower ends of the rear connecting rod (4) are respectively rotatably connected to the rear end of the seat frame (2) and the base (1); the seat frame (2) is provided with a first locking assembly (C) at a position corresponding to the rotatable connection of the rear connecting rod (4), and the seat frame (2) is provided with a first locking assembly (C). The first locking assembly (C) is used to switch the seat cushion frame (2) between maintaining a rotational connection with the rear connecting rod (4) and releasing the connection; a second locking assembly (D) is provided between the front connecting rod (3) and the base (1); the second locking assembly (D) is used to switch the front connecting rod (3) between maintaining a rotational connection with the base (1) and a fixed connection; a driving mechanism (5) is provided between the seat cushion frame (2) and the front connecting rod (3); the driving mechanism (5) is used to drive the seat cushion frame (2) to rotate relative to the front connecting rod (3); A retaining assembly (F) is provided on the base (1), and the retaining assembly (F) is used to keep the rear connecting rod (4) and the front connecting rod (3) in synchronous motion.

2. The front and rear connecting rod synchronization maintaining mechanism according to claim 1, characterized in that: The retaining assembly (F) includes a first gear (F1) and a second gear (F2) rotatably mounted on the base (1); the lower end of the front connecting rod (3) is provided with a first arc-shaped tooth portion (a) meshing with the first gear (F1); the lower end of the rear connecting rod (4) is provided with a second arc-shaped tooth portion (b) meshing with the second gear (F2); the lower end of the first gear (F1) has a first extension portion (F11) extending downward; the lower end of the second gear (F2) has a second extension portion (F21) extending downward; a synchronization rod (F3) is provided between the lower portions of the first extension portion (F11) and the second extension portion (F21); and the two ends of the synchronization rod (F3) are rotatably connected to the lower portions of the first extension portion (F11) and the second extension portion (F21), respectively.

3. The front and rear connecting rod synchronization maintaining mechanism according to claim 1, characterized in that: A latch (6) is fixedly provided at the upper end of the rear connecting rod (4), and the first locking assembly (C) is capable of locking the latch (6) or releasing the latch (6).

4. The front and rear connecting rod synchronization maintaining mechanism according to claim 1, characterized in that: The second locking assembly (D) comprises a locking frame (D1) fixed on the base (1), a locking rod (D2) located above the locking frame (D1), and a zipper (D3) connected between the locking frame (D1) and the locking rod (D2); the lower end of the front connecting rod (3) is rotatably connected to the locking frame (D1); the middle part of the locking rod (D2) is hinged to the front connecting rod (3); one end of the locking frame (D1) is provided with a locking notch (a); one end of the locking rod (D2) has a clamping portion (b) adapted to the locking notch (a); the zipper (D3) is used to clamp the clamping portion (b) in the locking notch (a), or to move the clamping portion (b) upward away from the locking notch (a).

5. The front and rear connecting rod synchronization maintaining mechanism according to claim 4, characterized in that: The distal end of the zipper (D3) is connected to a manual traction mechanism or an electric traction device.

6. The front and rear connecting rod synchronization maintaining mechanism according to claim 1, characterized in that: The front connecting rod (3), the rear connecting rod (4), the first locking assembly (C) and the retaining assembly (F) are each provided with two groups and correspond one to one. The two groups of the front connecting rods (3) are respectively arranged on both sides of the front end of the seat cushion frame (2), and the two groups of the rear connecting rods (4) are respectively arranged on both sides of the rear end of the seat cushion frame (2).

7. The front and rear connecting rod synchronization maintaining mechanism according to claim 1, characterized in that: A torsion spring (7) is provided between the rear connecting rod (4) and the base (1).

8. The front and rear connecting rod synchronization maintaining mechanism according to claim 1, characterized in that: The driving mechanism (5) is an electric angle adjuster.

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