Synchronous holding mechanism of front and rear linkages applied to seat frame deformation adjustment

Abstract

This invention discloses a synchronous holding mechanism for front and rear linkages applied to seat frame deformation adjustment, including a base, a seat cushion frame located above the base, and a front linkage and a rear linkage disposed between the seat cushion frame and the base. The upper and lower ends of the front linkage are rotatably connected to the front end of the seat cushion frame and the base, respectively, and the upper and lower ends of the rear linkage are rotatably connected to the rear end of the seat cushion frame and the base, respectively. The seat cushion frame is provided with a first locking component at the position corresponding to the rotatable connection of the rear linkage, and a second locking component is provided between the front linkage and the base. A driving mechanism is provided between the seat cushion frame and the front linkage, which is used to drive the seat cushion frame to rotate relative to the front linkage. A holding component is provided on the base to keep the rear linkage and the front linkage moving synchronously. The beneficial effect of this invention is that it can fix and support the rear linkage on the base when the seat cushion frame is flipped forward, and at the same time, it will not cause movement interference to the forward movement adjustment of the seat cushion frame in the sitting position.

Description

Technical Field

[0001] This invention relates to the field of automotive seat technology, and more specifically to a front and rear linkage synchronous holding mechanism for adjusting seat frame deformation. Background Technology

[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 to set the backrest as a double-layer structure. By flipping the seat cushion forward 180 degrees, the entire backrest is folded forward and flush with the flipped seat cushion. Then, the upper backrest is flipped backward and unfolded 180 degrees, thereby realizing the conversion of the seat from a sitting position to a lying position.

[0003] Meanwhile, to enable backrest angle adjustment in a seated position, the seat cushion also features an overall forward-moving function, thus creating space under the backrest for angle adjustment. To this end, the applicant proposes to install front and rear links between the seat cushion and the base at both ends, forming a sequentially hinged four-bar linkage. A drive mechanism connects the seat cushion to the front link, and a locking device is located at the rear end of the seat cushion. This locking device allows the seat cushion to switch between being rotatably connected to and disconnected from the upper end of the rear link. When the seat cushion is rotatably connected to the upper end of the rear link, the drive mechanism rotates the seat cushion, causing the four-bar linkage to move and move the seat cushion forward. After the seat cushion is disconnected from the upper end of the rear link, the drive mechanism drives 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 linkage, the lower end of the rear linkage is rotatably connected to the base. At this time, the rear linkage cannot be fixedly supported on the base and will rotate relative to it. When the seat cushion rotates back to the sitting position, the rear end of the seat cushion cannot align with the upper end of the rear linkage. Therefore, in the four-bar linkage consisting of the seat cushion, front linkage, base, and rear linkage, there is a lack of a retaining mechanism that can fix the rear linkage to the base when the seat cushion flips forward, while preventing movement interference with the forward adjustment 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 linkage synchronous holding mechanism for seat frame deformation adjustment to meet the technical requirements proposed in the background art.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A synchronous retaining mechanism for front and rear linkages applied to seat frame deformation adjustment, the key features of which include: a base, a seat cushion frame located above the base, and a front linkage and a rear linkage disposed between the seat cushion frame and the base. The upper and lower ends of the front linkage are rotatably connected to the front end of the seat cushion frame and the base, respectively, and the upper and lower ends of the rear linkage are rotatably connected to the rear end of the seat cushion frame and the base, respectively. The seat cushion frame is provided with a first locking component at the position corresponding to the rotatable connection of the rear linkage. The first locking component is used to switch the seat cushion frame between rotatably connected to the rear linkage and to disengage. A second locking component is provided between the front linkage and the base. The second locking component is used to switch the front linkage between rotatably connected to the base and to be fixedly connected. A driving mechanism is provided between the seat cushion frame and the front linkage, and the driving mechanism is used to drive the seat cushion frame to rotate relative to the front linkage.

[0008] The base is provided with a retaining component, which is used to keep the rear link and the front link moving synchronously.

[0009] With the above structure, in the sitting position mode, the first locking component keeps the rear end of the seat cushion frame rotatably connected to the upper end of the rear link, and the second locking component keeps the lower end of the front link rotatably connected to the base. The retaining component allows the rear link to rotate synchronously with the front link. At this time, under the self-locking restriction of the drive mechanism, the front link, base, rear link, and seat cushion frame form a stable four-bar linkage, and the seat cushion frame can be stably supported on the base. When it is necessary to adjust the seat back angle, the drive mechanism drives the seat cushion frame to rotate relative to the front link, which in turn drives the four-bar linkage to move, thereby realizing the forward movement of the seat cushion frame and exposing the rear space of the seat cushion frame. This ensures that the backrest tilt angle adjustment is not obstructed or interfered with by the rear end of the seat cushion in the sitting position. The first locking component releases the connection between the seat cushion frame and the rear link. Under the driving action of the drive mechanism, the rear end of the seat cushion frame can move upward away from the upper end of the rear link, so that the seat cushion frame can flip forward and flatten relative to the front link. At the same time, the second locking component fixes the lower end of the front link to the base, and the holding component keeps the rear link stationary with the front link, ensuring that when the seat frame flips back to a horizontal state again, the first locking component can accurately engage 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 that meshes with the first gear, and the lower end of the rear connecting rod is provided with a second arc-shaped tooth that meshes with the second gear. The lower end of the first gear has a first extension extending downward, and the lower end of the second gear has a second extension extending downward. A synchronizing rod is provided between the lower parts of the first extension and the second extension, and the two ends of the synchronizing rod are rotatably connected to the lower parts of the first extension and the second extension, respectively.

[0011] Preferably, the upper end of the rear link is fixed with a directional pin, and the first locking component can engage or release the pin.

[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 connecting the locking frame and the locking rod. The lower end of the front connecting rod is rotatably connected to the locking frame, and the middle part of the locking rod is hinged to the front connecting rod. One end of the locking frame is provided with a locking notch, and one end of the locking rod has a locking portion adapted to the locking notch. The zipper is used to engage the locking portion in the locking notch or to move the locking 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 link, rear link, first locking assembly and retaining assembly are each provided in two sets, and correspond one to one. The two sets of the front link are respectively arranged on both sides of the front end of the seat cushion frame, and the two sets of the rear link 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 drive 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 synchronous retaining mechanism for front and rear linkages used in seat frame deformation adjustment. When the seat cushion frame is flipped forward, the second locking component fixes the front linkage. Under the synchronous action of the retaining component, the rear linkage remains synchronously stationary with the front linkage, thus ensuring that when the seat cushion frame flips backward to a horizontal state, the first locking component can precisely engage the rear linkage. In the sitting posture mode, the retaining component allows the rear linkage to rotate synchronously with the front linkage, without affecting the four-bar linkage structure composed of the front linkage, base, rear linkage, and seat cushion frame, thus ensuring that the seat cushion frame's front-to-back adjustment function remains unaffected.

[0019] 2. The synchronous holding mechanism for the front and rear connecting rods used in seat frame deformation adjustment provided by this invention eliminates the need for a separate locking mechanism between the rear connecting rod and the base. By using the holding assembly for synchronous transmission, the connection state between the rear connecting rod and the base can be kept synchronized with that of 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, this structural design can also reduce the later maintenance cost and has the technical advantages of energy saving and high efficiency. Attached Figure Description

[0020] Figure 1 Right view of the front and rear linkage synchronization mechanism;

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

[0022] Figure 3 The right view of the front and rear linkage synchronous holding mechanism when the seat frame 2 is flipped forward;

[0023] Figure 4 This is a schematic diagram of the structure of the first locking component C;

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

[0025] Figure 6 This is a reference diagram showing the operating state of the front and rear linkage synchronization mechanism. Detailed Implementation

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

[0027] Please refer to Figure 1 A synchronous retaining mechanism for front and rear linkages used in seat frame deformation adjustment includes a base 1 and a seat cushion frame 2 mounted on the base 1. A front linkage 3 and a rear linkage 4 are provided between the seat cushion frame 2 and the base 1. The upper and lower ends of the front linkage 3 are rotatably connected to the front end of the seat cushion frame 2 and the base 1, respectively, while the upper and lower ends of the rear linkage 4 are rotatably connected to the rear end of the seat cushion frame 2 and the base 1, respectively. A first locking component C is provided on the seat cushion frame 2 at the position corresponding to the rotatable connection with the rear linkage 4. This first locking component C allows the seat cushion frame 2 to switch between being rotatably connected to and disconnected from the rear linkage 4. A second locking component D is provided between the front linkage 3 and the base 1. The second locking component D allows the front linkage 3 to switch between being rotatably connected to and fixedly connected to the base 1. A retaining component F is provided on the base 1, which allows the rear linkage 4 to move synchronously with the front linkage 3. Figure 5 As can be seen, a drive mechanism 5 is provided between the seat cushion frame 2 and the front link 3. The drive mechanism 5 is used to drive the seat cushion frame 2 to rotate relative to the front link 3. In this embodiment, the drive mechanism 5 is an electric angle adjuster, which can drive the seat cushion frame 2 to rotate relative to the front link 3 by controlling the electric angle adjuster with a motor.

[0028] Based on the above structural design, the front and rear linkage synchronous holding mechanism used for seat frame deformation adjustment is applied to the seat of the convertible bed. In the sitting posture mode, the first locking component C keeps the rear end of the seat cushion frame 2 rotatably connected to the upper end of the rear linkage 4, the second locking component D keeps the lower end of the front linkage 3 rotatably connected to the base 1, and the holding component F allows the rear linkage 4 to rotate synchronously with the front linkage 3. At this time, under the self-locking restriction of the drive mechanism 5, the front linkage 3, the base 1, the rear linkage 4, and the seat cushion frame 2 form a stable four-bar linkage 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 drive mechanism 5 drives the seat cushion frame 2 to rotate relative to the front linkage 3, which in turn drives the four-bar linkage 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, so as to ensure that the backrest tilt angle adjustment is not obstructed or interfered with by the rear end of the seat cushion in the sitting posture. When the seat needs to be converted into a bed, refer to Figure 3 The first locking component C disconnects the seat cushion frame 2 from the rear link 4. Under the driving action of the drive mechanism 5, the rear end of the seat cushion frame 2 can move upward away from the upper end of the rear link 4, so that the seat cushion frame 2 can flip forward and flatten around the front link 3. At the same time, the second locking component D fixes the lower end of the front link 3 to the base 1, thereby providing strong support for the flipping of the seat cushion frame 2. The holding component F keeps the rear link 4 synchronously stationary with the front link 3, ensuring that when the seat cushion frame 2 flips backward to a horizontal state again, the first locking component C can accurately engage the rear link 4, ensuring the feasibility of switching between the sitting and reclining positions of the seat.

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

[0030] With this design, when the seat cushion frame 2 needs to be flipped forward, the second locking assembly D fixes the lower end of the front link 3 to the base 1. That is, the first arc-shaped tooth a at the lower end of the front link 3 is fixedly engaged with the first gear F1. Under the synchronous action of the synchronizing rod F3, the second arc-shaped tooth b at the lower end of the rear link 4 is also fixedly engaged with the second gear F2, so that the rear link 4 can be locked relative to the base 1. On the other hand, when the seat is in a sitting position, the second locking assembly D keeps the lower end of the front link 3 rotatably connected to the base 1. The drive mechanism 5 drives the seat cushion frame 2 to rotate relative to the front link 3, which can drive the lower end of the front link 3 to rotate. The rotation of the lower end of the front link 3 can drive the first gear F1 to rotate around the base 1. Under the synchronous transmission action of the synchronizing rod F3, the second gear F2 and the lower end of the rear link 4 are driven to rotate in sequence, thereby realizing the function of moving the seat cushion frame 2 forward.

[0031] In the above structural design, the function of the retaining component F is as follows: 1. After the first locking component C is unlocked, the seat frame 2 flips forward. Under the action of the retaining component F, the rear link 4 can remain stationary, ensuring that when the seat frame 2 flips backward to a horizontal state again, the first locking component C can accurately engage with the upper end of the rear link 4; 2. In the sitting posture mode, when the drive mechanism 5 drives the seat frame 2 to move forward for adjustment, the retaining component F adopts the above transmission structure and will not affect the four-bar linkage composed of the front link 3, the base 1, the rear link 4, and the seat frame 2, thereby ensuring that the seat frame 2 can achieve the front and rear adjustment function; 3. Through the meshing self-locking action between 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 motion precision.

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

[0033] like Figure 1 and Figure 3 As shown, a pin 6 is fixedly provided at the upper end of the rear link 4. The pin 6 is perpendicular to the rear link 4 and extends towards the first locking component C. The first locking component C can engage or release the pin 6. When the first locking component C engages the pin 6, the pin 6 is rotatably connected to the first locking component C, that is, the upper end of the rear link 4 is rotatably connected to the rear end of the seat frame 2. When the first locking component C releases the pin 6, the connection between the first locking component C and the pin 6 is released, that is, the connection between the rear end of the seat 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 component C adopts a floor lock structure, which includes a base C3 fixedly mounted at the rear end of the seat cushion frame 2. A locking hook C1 and an unlocking component C2 for controlling 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 pin 6, so that the pin 6 remains rotatably connected to the rear end of the seat cushion frame 2. When unlocking, the unlocking component C2 pulls the locking hook C1 to rotate, the locking hook C1 releases the pin 6, and the rear end of the seat cushion frame 2 can move upward away from the pin 6. Floor locks are a mature technology in the field of automotive seat technology, and will not be described 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 connecting the locking frame D1 and the locking rod D2. The locking frame D1 is fixedly mounted on the base 1, the lower end of the front connecting rod 3 is rotatably connected to the locking frame D1, and the middle part of the locking rod D2 is hinged to the front connecting rod 3. One end of the locking frame D1 has a locking notch a, and one end of the locking rod D2 has a downwardly extending latching part b, which adapts to the locking notch a. When the second locking assembly D is locked, the latching part b of the locking rod D2 latches downward onto the locking notch a. At this time, the locking frame D1, the locking rod D2, and the front connecting rod 3 form a stable triangular frame, and the front connecting rod 3 can be fixedly supported on the base 1. When unlocking, the locking rod D2 is pulled downward by the zipper D3, and the latching part b can move upward away from the locking notch a. At this time, the lower end of the front connecting rod 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 the manual traction mechanism or the electric traction device, the locking 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 component C and the retaining component F are each provided in two sets, and they correspond one to one. The two sets of front links 3 are respectively arranged on both sides of the front end of the seat frame 2, and the two sets of rear links 4 are respectively arranged on both sides of the rear end of the seat frame 2. The second locking component D is arranged inside one of the sets of front links 3.

[0037] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention. Those skilled in the art, under the guidance of the present invention, can make various similar representations without departing from the spirit and claims of the present invention, and such modifications all fall within the protection scope of the present invention.

Claims

1. A synchronous retaining mechanism for front and rear connecting rods applied to seat frame deformation adjustment, characterized in that: The system includes a base (1), a seat frame (2) located above the base (1), and a front connecting rod (3) and a rear connecting rod (4) disposed between the seat frame (2) and the base (1). The upper and lower ends of the front connecting rod (3) are rotatably connected to the front end of the seat frame (2) and the base (1), respectively. The upper and lower ends of the rear connecting rod (4) are rotatably connected to the rear end of the seat frame (2) and the base (1), respectively. The seat frame (2) is provided with a first locking component (C) at the position corresponding to the rotatable connection of the rear connecting rod (4). The first locking assembly (C) is used to switch the seat frame (2) between being rotatably connected to the rear link (4) and being disconnected. A second locking assembly (D) is provided between the front link (3) and the base (1). The second locking assembly (D) is used to switch the front link (3) between being rotatably connected to the base (1) and being fixedly connected. A drive mechanism (5) is provided between the seat frame (2) and the front link (3). The drive mechanism (5) is used to drive the seat frame (2) to rotate relative to the front link (3). The base (1) is provided with a retaining component (F), which is used to keep the rear link (4) and the front link (3) moving synchronously.

2. The synchronous holding mechanism for front and rear connecting rods applied to seat frame deformation adjustment 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 (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 (b) that meshes with the second gear (F2). The lower end of the first gear (F1) has a downwardly extending first extension (F11), and the lower end of the second gear (F2) has a downwardly extending second extension (F21). A synchronizing rod (F3) is provided between the lower parts of the first extension (F11) and the second extension (F21). The two ends of the synchronizing rod (F3) are rotatably connected to the lower parts of the first extension (F11) and the second extension (F21), respectively.

3. The synchronous holding mechanism for front and rear connecting rods applied to seat frame deformation adjustment according to claim 1, characterized in that: The upper end of the rear link (4) is fixed with a directional pin (6), and the first locking component (C) can engage or release the pin (6).

4. The synchronous holding mechanism for front and rear connecting rods applied to seat frame deformation adjustment according to claim 1, characterized in that: The second locking assembly (D) includes a locking frame (D1) fixed on the base (1), a locking rod (D2) located above the locking frame (D1), and a zipper (D3) connecting 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), and 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), and one end of the locking rod (D2) has a latching part (b) adapted to the locking notch (a). The zipper (D3) is used to latch the latching part (b) into the locking notch (a) or to move the latching part (b) upward away from the locking notch (a).

5. The synchronous holding mechanism for front and rear connecting rods applied to seat frame deformation adjustment according to claim 4, characterized in that: The zipper (D3) is connected at its distal end to a manual traction mechanism or an electric traction device.

6. The synchronous holding mechanism for front and rear connecting rods applied to seat frame deformation adjustment according to claim 1, characterized in that: The front link (3), rear link (4), first locking assembly (C) and retaining assembly (F) are each provided in two sets, and they correspond one to one. The two sets of the front link (3) are respectively arranged on both sides of the front end of the seat frame (2), and the two sets of the rear link (4) are respectively arranged on both sides of the rear end of the seat frame (2).

7. The synchronous holding mechanism for front and rear connecting rods applied to seat frame deformation adjustment 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 synchronous holding mechanism for front and rear connecting rods applied to seat frame deformation adjustment according to claim 1, characterized in that: The drive mechanism (5) is an electric angle adjuster.

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