Front and rear connecting rod synchronous keeping mechanism applied to seat frame deformation adjustment

Abstract

The invention discloses a front and rear connecting rod synchronous keeping mechanism applied to seat frame deformation adjustment, which comprises a base, a seat cushion framework positioned above the base, and a front connecting rod and a rear connecting rod which are arranged between the seat cushion framework and the base, and the upper and lower ends 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 beneficial effects that when the seat cushion framework is overturned forwards, the rear connecting rod is fixedly supported on the base, and meanwhile, in a sitting posture state, movement interference cannot be caused to forward movement adjustment of the seat cushion framework.

Description

Technical Field

[0001] The invention relates to the technical field of automobile seats, and in particular to a front and rear connecting rod synchronization maintaining mechanism used for adjusting the deformation of a seat frame. 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 deploying 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 unfolded 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 the angle adjustment of the backrest in the sitting state, the seat cushion also has the function of moving forward as a whole, so as to leave space for the lower part of the backrest and facilitate the angle adjustment of the backrest. To this end, the applicant intends to respectively set 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 mechanism that is hinged in sequence, and a driving mechanism is provided between the seat cushion and the front link, and a lock is provided at the rear end of the seat cushion, which 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 is in a rotational connection with the upper end of the rear link, the driving mechanism drives the seat cushion to rotate, which can drive the four-bar mechanism to move, and realize the forward movement of the seat cushion; after the seat cushion is released from the connection with the upper end of the rear link, the driving mechanism can drive the seat cushion to flip forward relative to the front link.

[0004] However, in this research and development process, when the seat cushion flips forward relative to the front link, the lower end of the rear link is connected to the base in a rotational manner. At this time, the rear link cannot be fixedly supported on the base and will rotate relative to the base. When the seat cushion rotates from front to back to the sitting position again, the rear end of the seat cushion cannot dock with the upper end of the rear link. Therefore, in the four-link mechanism composed of the seat cushion, front link, base and rear link, there is still a lack of a retaining mechanism that can fix and support the rear link on the base when the seat cushion flips forward, and at the same time, will not cause motion interference to the forward movement adjustment of the seat cushion in the sitting state. Summary of the invention

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

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

[0007] A front and rear link synchronization holding mechanism used for adjusting the deformation of a seat frame, the key of which is: it comprises 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, wherein 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, a second locking assembly is provided 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 mode, the first locking assembly keeps the rear end of the seat frame in rotational connection with the upper end of the rear link, the second locking assembly keeps the lower end of the front link in rotational connection with the base, and the holding assembly allows the rear link to rotate synchronously with the front link. At this time, under the self-locking restriction of the driving mechanism, the front link, the base, the rear link and the seat frame form a stable four-bar linkage, and the seat frame can be stably supported on the base. When the angle of the seat back needs to be adjusted, the driving mechanism drives the seat frame to rotate relative to the front link, which can drive the four-bar linkage to move, thereby realizing the forward movement of the seat frame, exposing the rear space of the seat frame, so as to ensure that in the sitting state, the backrest inclination adjustment is not blocked by the rear end of the seat cushion. The first locking assembly releases the connection between the seat frame and the rear link, and under the driving action of the driving mechanism, the rear end of the seat frame can move upward away from the upper end of the rear link, so that the seat frame can be flipped forward relative to the front link. At the same time, the second locking assembly fixes the lower end of the front connecting rod to the base, and the retaining assembly keeps the rear connecting rod synchronously and stationary with the front connecting rod, ensuring that when the seat cushion frame is flipped backward to a horizontal state again, the first locking assembly can accurately dock with the rear connecting rod.

[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 directional latch is fixedly provided at the upper end of the rear connecting rod, and the first locking assembly can lock 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, a clamping portion adapted to the locking notch is provided at one end of the locking rod, and 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, the rear connecting rod, the first locking assembly and the retaining assembly are each provided with two groups, and correspond one to one, the two groups of the front connecting rods are respectively arranged on both sides of the front end of the seat cushion frame, and the two groups of the 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 present invention has the following beneficial effects:

[0018] 1. The front and rear connecting rod synchronous holding mechanism for adjusting the deformation of the seat frame provided by the present invention is adopted. When the seat frame is flipped forward, the second locking component fixes the front connecting rod. Under the synchronous action of the holding component, the rear connecting rod remains synchronously stationary with the front connecting rod, thereby ensuring that when the seat frame flips backward to a horizontal state again, the first locking component can accurately dock with the rear connecting rod. In the sitting posture mode, the holding component enables the rear connecting rod to rotate synchronously with the front connecting rod, and will not affect the four-link structure composed of the front connecting rod, the base, the rear connecting rod and the seat frame, that is, it can ensure that the front and rear adjustment function of the seat frame is not affected.

[0019] 2. By adopting a front and rear connecting rod synchronization holding mechanism for seat frame deformation adjustment provided by the present invention, there is no need to separately set a locking mechanism between the rear connecting rod and the base. By performing synchronous transmission through the holding component, 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 1 It is the right view of the front and rear connecting rod synchronization holding mechanism;

[0021] Figure 2 It is a structural diagram of the front and rear connecting rod synchronization holding mechanism (the synchronization rod F3 is hidden);

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

[0023] Figure 4 is a structural schematic diagram 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 connecting rod synchronization holding mechanism. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with embodiments and drawings.

[0027] Please refer to Figure 1 , a front and rear link synchronization holding mechanism used for seat frame deformation adjustment, 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 rotatably connected to the front end of the seat cushion frame 2 and the base 1 respectively, and the upper and lower ends of the rear link 4 are rotatably connected to the rear end of the seat cushion frame 2 and the base 1 respectively. 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 used for seat frame deformation adjustment 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-bar linkage, and the seat cushion frame 2 can be stably supported on the base 1. When the seat back angle needs to be adjusted, the driving mechanism 5 drives the seat cushion frame 2 to rotate relative to the front link 3, which can drive the four-bar linkage 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 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 cushion frame 2 and the rear link 4. Under the driving action of the driving mechanism 5, the rear end of the cushion frame 2 can move upward away from the upper end of the rear link 4, so that the cushion frame 2 can flip forward around the front link 3 and lie flat. At the same time, the second locking assembly D makes the lower end of the front link 3 fixedly connected to the base 1, thereby providing strong support for the flipping of the cushion frame 2. The holding assembly F makes the rear link 4 keep synchronous and stationary with the front link 3, ensuring that when the cushion frame 2 flips backward to a horizontal state again, the first locking assembly C can accurately dock with the rear link 4, ensuring the feasibility of the seat switching back and forth between the sitting state and the lying state.

[0029] Further, refer to Figure 1 and 2 The holding assembly F includes a first gear F1 and a second gear F2 which are rotatably mounted on the base 1 respectively. The lower end of the front link 3 is provided with a first arc-shaped tooth portion a which meshes with the first gear F1, and the lower end of the rear link 4 is provided with a second arc-shaped tooth portion b which 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 rotatably connected with the lower parts of the first extension portion F11 and the second extension portion F21 respectively.

[0030] With such a design, when the cushion frame 2 needs to be flipped forward, the second locking assembly D makes the lower end of the front link 3 fixedly connected to the base 1, that is, the first arc-shaped tooth portion a at the lower end of the front link 3 is fixedly engaged with the first gear F1, and under the synchronous action of the synchronization rod F3, the second arc-shaped tooth portion 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 makes the lower end of the front link 3 remain rotationally connected to the base 1, and the driving mechanism 5 drives the 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, and under the synchronous transmission action of the synchronization rod F3, the second gear F2 and the lower end of the rear link 4 are driven to rotate in turn, thereby realizing the forward movement function of the 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 be kept stationary, 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, the base 1, the rear link 4 and the seat cushion frame 2, thereby ensuring that the seat cushion frame 2 can achieve 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 fixedly arranged at the upper end of the rear link 4, and the latch 6 is perpendicular to the rear link 4 and extends in the direction of the first locking assembly C. The first locking assembly C can be engaged with or released from the latch 6. When the first locking assembly C is engaged with the latch 6, the latch 6 and the first locking assembly C are kept in rotational connection, that is, the upper end of the rear link 4 is kept in rotational connection with the rear end of the cushion frame 2; when the first locking assembly C releases the latch 6, the connection between the first locking assembly C and the latch 6 can be released, that is, the connection between the rear end of the 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 adopts a ground lock structure, which includes a base C3 fixedly arranged at the rear end of the cushion frame 2, on which a lock hook C1 and an unlocking component C2 for controlling the rotation of the lock hook C1 are rotatably arranged. In the locked state, the lock hook C1 is locked with the latch 6 so that the latch 6 is kept in rotational connection with the rear end of the cushion frame 2; when unlocking, the unlocking component C2 pulls the lock hook C1 to rotate, and the lock hook C1 releases the latch 6, so that the rear end of the cushion frame 2 can move upward away from the latch 6. In the field of automobile seat technology, ground locks are mature technologies 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 connected between the locking frame D1 and the locking rod D2, wherein the locking frame D1 is fixedly assembled 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. A locking notch a is provided at one end of the locking frame D1, and a clamping portion b extending downward is provided at one end of the locking rod D2, and the clamping portion b 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 downward on the locking notch a, at which 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 clamping portion b can move upward away from the locking notch a, at which time, the lower end of the front connecting rod 3 can maintain a rotatable connection with the base 1. In this embodiment, a manual traction mechanism or an electric traction device is connected to the far end of the zipper D3, and the lock rod D2 can be manually or electrically controlled to rotate around the first connecting rod B1 through the manual traction mechanism or the electric traction device.

[0036] refer to Figure 6 In the present 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, and such changes all fall within the scope of protection of the present invention.

Claims

1. A front and rear connecting rod synchronization holding mechanism used for seat frame deformation adjustment, characterized in that: The invention comprises a base (1), a seat cushion frame (2) located above the base (1), and a front connecting rod (3) and a rear connecting rod (4) arranged between the seat cushion 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 cushion 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 cushion frame (2) and the base (1); the seat cushion frame (2) is provided with a first locking assembly (C) at a position corresponding to the rotatable connection of the rear connecting rod (4), 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); The base (1) is provided with a retaining assembly (F), which 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 for adjusting seat frame deformation according to claim 1, characterized in that: The retaining assembly (F) comprises 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 parts 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 parts of the first extension portion (F11) and the second extension portion (F21), respectively.

3. The front and rear connecting rod synchronization maintaining mechanism for adjusting seat frame deformation according to claim 1, characterized in that: A directional latch (6) is fixedly provided at the upper end of the rear connecting rod (4), and the first locking component (C) can lock the latch (6) or release the latch (6).

4. The front and rear connecting rod synchronization maintaining mechanism for adjusting seat frame deformation 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 for adjusting seat frame deformation according to claim 4, characterized in that: The far 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 for adjusting seat frame deformation 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 for adjusting seat frame deformation 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 for adjusting seat frame deformation according to claim 1, characterized in that: The driving mechanism (5) is an electric angle adjuster.

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