Seat-backrest linkage mechanism with independent backrest adjusting function

Abstract

The seat-backrest linkage mechanism with the independent backrest adjusting function is characterized in that a backrest framework is rotatably installed at the rear end of a seat frame framework, two linkage rods are symmetrically arranged on the two sides of the seat frame framework, one end of each linkage rod is hinged to the backrest framework, and the other end of each linkage rod is hinged to the rear end of a seat basin; a return spring is arranged between the rear end of the seat basin and the seat frame skeleton, two sliding grooves are formed in the front end of the seat basin in a bilateral symmetry mode, the seat frame skeleton is hinged to the foremost ends of the two sliding grooves in a sliding mode, and a driving piece is arranged on the backrest skeleton. When the backrest framework is overturned backwards from the initial position to the overturning angle limit position after the sitting state, the driving piece can just abut against the linkage rod, at the moment, the backrest framework continues to be overturned backwards, and the driving piece can drive the linkage rod to lift the rear end of the seat basin. According to the utility model, the independent adjustment of the backrest can be realized within the angle range of the sitting state of the backrest, and the lifting adjustment of the seat cushion can be realized when the backrest is laid flat.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile seats, in particular to a seat-back linkage mechanism with a backrest independent adjustment function. Background Art

[0002] The comfort of car seats plays a decisive role in the user's driving experience. Nowadays, both car manufacturers and consumer terminals have put forward more stringent requirements for seat comfort. In order to facilitate passengers to rest or provide more diverse sitting postures, most seats have a flat function, that is, the backrest can be reclined to a horizontal or nearly horizontal position.

[0003] In the existing car seat structure, since the rear end of the seat support plane itself is slightly tilted downward, and the rotation centerline of the backrest adjuster is higher than the seat support plane, there is a height difference between the seat support plane and the backrest support plane after the backrest is flattened. The height difference will cause the rear end of the user's buttocks to lack support, or even be in an obviously suspended state, and the user's comfort experience when lying flat is poor. In response to the above problems, although some seats have realized seat-back linkage to eliminate the height difference between the seat cushion and the backrest, the existing seat-back linkage mechanism is often complex in structure, and the backrest and seat cushion are linked throughout the entire stroke, and the backrest cannot be independently adjusted within a specific stroke. Utility Model Content

[0004] In view of the problems existing in the above-mentioned prior art, the utility model aims to provide a seat-back linkage mechanism with an independent backrest adjustment function, which can not only realize independent adjustment of the backrest within the angle range of the backrest sitting state, avoiding the seat-back linkage affecting the user's riding experience, but also realize the lifting adjustment of the seat cushion when the backrest is laid flat, eliminating the height difference between the seat cushion and the backrest.

[0005] In order to achieve the above-mentioned purpose, the utility model proposes a seat linkage mechanism with an independent backrest adjustment function, comprising a backrest frame, a seat frame frame and a seat basin, the backrest frame is rotatably mounted on the rear end of the seat frame frame, the seat basin is located above the seat frame frame, and also includes two linkage rods symmetrically arranged on both sides of the seat frame frame, one end of the linkage rod is hinged on the backrest frame, and the other end is hinged to the rear end of the seat basin on the corresponding side, and the hinge point of the linkage rod and the backrest frame, and the hinge point of the backrest frame and the seat frame frame are located on the same axis, and a hinge is arranged between the rear end of the seat basin and the seat frame frame. There is a return spring, and two sliding grooves extending front and back are symmetrically arranged at the front end of the seat basin. The seat frame frame is hinged to the front end of the two sliding grooves through two seat basin brackets, and can slide relative to the sliding grooves. The backrest frame is provided with driving parts corresponding to the two linkage rods, and the driving parts are located on the rear side of the linkage rod. When the backrest frame is flipped backward from the initial position to the extreme position of the flipping angle after the sitting state, the driving part can just abut against the corresponding side linkage rod. At this time, the backrest frame continues to flip backward, and the driving part can drive the linkage rod to drive the seat basin to slide forward relative to the seat basin bracket and lift the rear end of the seat basin.

[0006] In the above scheme: the backrest frame flips 20° backward from the initial position to the extreme position of the flip angle in the sitting state, and the backrest frame flips 20° to 50° backward to the lying flat adjustment angle. When the backrest frame flips backward to 50°, the seat basin bracket is located at the rear end of the slide. Specifically: the backrest frame rotates 20 degrees forward and backward to the normal sitting state angle, at which time the seat basin is not linked; the backrest frame rotates 20-50 degrees backward to the lying flat adjustment angle, at which time the seat basin is linked to the backrest frame, and the rear end of the seat basin rises and is flush with the backrest frame.

[0007] In the above scheme: the linkage rod is in an "L" shape or a "V" shape, so that when the backrest frame is flipped backwards by 20° from the initial position, the driving member can just abut against the linkage rod.

[0008] In the above scheme: the rear end of the seat basin is hinged to the linkage rod through two hinge brackets symmetrically arranged on the left and right, and the seat basin and the hinge bracket are fixedly connected, with a simple structure and convenient assembly.

[0009] In the above scheme: the return spring is connected between the hinge bracket and the seat frame frame, and each of the two hinge brackets is connected with a return spring, which has a simple structure and is easy to arrange.

[0010] In the above scheme: two slide brackets are welded symmetrically on the left and right sides of the front end of the basin, and the slide groove is opened on the slide bracket, which has a simple structure and is easy to process.

[0011] In the above scheme: the surface of the slide bracket and the slide groove is provided with a plastic coating layer, which not only protects the slide bracket, but also reduces the noise when the slide bracket slides relative to the bidet bracket.

[0012] In the above scheme: the seat basin bracket is welded and fixed on the front transverse tube of the seat frame frame, and the seat basin bracket is hinged in the slide groove through step bolts and nuts, which has a simple structure and is easy to assemble.

[0013] The beneficial effects of the utility model are:

[0014] 1. When the backrest frame flips forward, or flips between the initial position and the extreme position of the flip angle after the sitting state, the driving member does not contact the linkage rod, and the backrest frame can be adjusted independently; that is, when the backrest frame is adjusting the angle of the sitting state, the seat basin does not move, avoiding that the height of the seat cushion of the backrest frame changes at the sitting state angle, thereby affecting the user's riding comfort. 2. When the backrest frame flips backward to a position exceeding the extreme position of the flip angle after the sitting state, that is, it enters the lying flat angle, when the backrest frame adjusts the lying flat angle, the driving member abuts against the linkage rod and drives the linkage rod to drive the seat basin to slide forward relative to the seat basin bracket, and lift the rear end of the seat basin to achieve zero height difference between the seat cushion and the backrest frame. In short, the utility model has a simple structure and is easy to operate. It can not only realize the lifting adjustment of the seat cushion when the backrest is laid flat, eliminating the height difference between the seat cushion and the backrest; it can also realize independent adjustment of the backrest within the angle range of the backrest in the sitting state, avoiding the linkage between the seat and the backrest affecting the user's riding experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the utility model when the backrest frame is flipped to the flip angle limit position before the sitting state.

[0016] Figure 2 It is a schematic diagram of the utility model when the backrest frame is located at the initial position.

[0017] Figure 3 It is a schematic diagram of the utility model when the backrest frame is flipped to the extreme flipping angle position after being flipped to the sitting state.

[0018] Figure 4 It is a schematic diagram of the utility model when the backrest frame is flipped to a lying angle position.

[0019] Figure 5 This is a schematic diagram of the installation of the return spring.

[0020] Figure 6 This is a schematic diagram of the installation of the guide bracket. DETAILED DESCRIPTION

[0021] like Figure 1 As shown in FIG. 6 , a seat-back linkage mechanism with independent backrest adjustment function is mainly composed of a backrest frame 1, a seat frame frame 5, a seat pot 4, and two linkage rods 3 symmetrically arranged on both sides of the seat frame frame 5. The backrest frame 1 is rotatably mounted on the rear end of the seat frame frame 5, and the seat pot 4 is located above the seat frame frame 5.

[0022] One end of the linkage rod 3 is hinged to the backrest frame 1, and the other end is hinged to the rear end of the corresponding side seat basin 4, and the hinge point between the linkage rod 3 and the backrest frame 1 and the hinge point between the backrest frame 1 and the seat frame frame 5 are located on the same axis.

[0023] A return spring 8 is provided between the rear end of the seat basin 4 and the seat frame frame 5. Two slide grooves 61 extending forward and backward are symmetrically provided at the front end of the seat basin 4. The seat frame frame 5 is hinged to the front ends of the two slide grooves 61 through two seat basin brackets 51 and can slide relative to the slide grooves 61. A driving member 2 is provided on the backrest frame 1 corresponding to the two linkage rods 3. The driving member 2 is located at the rear side of the linkage rod 3.

[0024] When the backrest frame 1 is flipped backward from the initial position to the extreme flipping angle position after the sitting state, the driving member 2 can just abut against the corresponding side linkage rod 3. At this time, the backrest frame 1 continues to be flipped backward. The driving member 2 can drive the linkage rod 3 to drive the seat basin 4 to slide forward relative to the seat basin bracket 51, and lift the rear end of the seat basin 4 to achieve zero height difference between the seat cushion and the backrest frame 1; and when the rear end of the seat basin 4 is lifted, the return spring 8 is subjected to tension. When the backrest frame 1 is flipped back to the normal use angle range, the rear end of the seat basin 4 can be reset under the tension of the return spring 8.

[0025] The seat is divided into a sitting state and a lying state. According to the riding needs of different people, the backrest frame 1 can adjust the angle between the initial position and the extreme position of the flip angle after the sitting state, and the seat basin 4 keeps the angle unchanged; when the backrest frame 1 continues to flip backward, the rear end of the seat basin 4 starts to lift upward to realize the conversion from the sitting state to the lying state. Preferably, the backrest frame 1 flips backward 20° from the initial position to the extreme position of the flip angle after the sitting state, and the backrest frame 1 flips backward 20°~50° to the lying adjustment angle. When the backrest frame 1 flips backward to 50°, the seat basin bracket 51 is located at the rear end of the slide 61. Specifically: the backrest frame 1 rotates 20 degrees forward and backward from the initial position to the normal sitting state use angle, and the seat basin 4 is not linked; the backrest frame 1 rotates backward 20-50 degrees to the lying adjustment angle, and the seat basin 4 is linked with the backrest frame 1, and the rear end of the seat basin 4 rises and is flush with the backrest frame 1.

[0026] Preferably, the linkage rod 3 is in an "L" shape or a "V" shape, so that when the backrest frame 1 is flipped backwards by 20° from the initial position, the driving member 2 can just abut against the linkage rod 3.

[0027] Preferably, the rear end of the basin 4 is hinged to the linkage rod 3 via two hinge brackets 7 symmetrically arranged on the left and right sides, and the basin 4 and the hinge brackets 7 are fixedly connected, with a simple structure and convenient assembly.

[0028] Preferably, the return spring 8 is connected between the hinge bracket 7 and the seat frame 5, and each of the two hinge brackets 7 is connected with a return spring 8, which has a simple structure and is easy to arrange.

[0029] Preferably, two slide brackets 6 are welded symmetrically at the front end of the basin 4, and the slide groove 61 is provided on the slide bracket 6, which has a simple structure and is easy to process.

[0030] Preferably, the surface of the slide bracket 6 and the slide groove 61 is provided with a plastic coating, which not only protects the slide bracket 6 but also reduces the noise when the slide bracket 6 slides relative to the bidet bracket 51.

[0031] Preferably, the seat basin bracket 51 is welded and fixed to the front transverse tube of the seat frame skeleton 5, and the seat basin bracket 51 is hinged in the slide groove 61 through step bolts and nuts, which has a simple structure and is easy to assemble.

Claims

1. A seat-back linkage mechanism with independent backrest adjustment function, comprising a backrest frame (1), a seat frame frame (5) and a seat basin (4), characterized in that: The invention also comprises two linkage rods (3) symmetrically arranged on both sides of the seat frame frame (5), one end of the linkage rod (3) is hinged on the backrest frame (1), and the other end is hinged on the rear end of the seat pan (4) on the corresponding side, and the hinge point between the linkage rod (3) and the backrest frame (1) and the hinge point between the backrest frame (1) and the seat frame frame (5) are located on the same axis, a return spring (8) is provided between the rear end of the seat pan (4) and the seat frame frame (5), and two slide grooves (61) extending forward and backward are symmetrically provided at the front end of the seat pan (4), and the seat frame frame (5) is hinged one by one to the two seat pan brackets (51). The front end of the slide groove (61) can slide relative to the slide groove (61). The backrest frame (1) is provided with a driving member (2) corresponding to the two linkage rods (3). The driving member (2) is located at the rear side of the linkage rod (3). When the backrest frame (1) is flipped backward from the initial position to the rear flipping angle limit position of the sitting state, the driving member (2) can just abut against the corresponding side linkage rod (3). At this time, the backrest frame (1) continues to flip backward. The driving member (2) can drive the linkage rod (3) to drive the seat pot (4) to slide forward relative to the seat pot bracket (51) and lift the rear end of the seat pot (4).

2. The seat-back linkage mechanism with independent backrest adjustment function according to claim 1, characterized in that: The backrest frame (1) is flipped backwards 20° from the initial position to reach the extreme flipping angle position in the sitting state, and the backrest frame (1) is flipped backwards 20° to 50° to reach the lying flat adjustment angle. When the backrest frame (1) is flipped backwards to 50°, the seat basin bracket (51) is located at the rearmost end of the slide groove (61).

3. The seat-back linkage mechanism with independent backrest adjustment function according to claim 1, characterized in that: The linkage rod (3) is in an "L" shape or a "V" shape.

4. The seat-back linkage mechanism with independent backrest adjustment function according to claim 1, characterized in that: The rear end of the seat basin (4) is hinged to the linkage rod (3) via two hinge brackets (7) symmetrically arranged on the left and right, and the seat basin (4) and the hinge brackets (7) are fixedly connected.

5. The seat-back linkage mechanism with independent backrest adjustment function according to claim 4, characterized in that: The return spring (8) is connected between the hinge bracket (7) and the seat frame skeleton (5), and each of the two hinge brackets (7) is connected to a return spring (8).

6. The seat-back linkage mechanism with independent backrest adjustment function according to claim 1, characterized in that: Two slide brackets (6) are welded symmetrically to the front end of the basin (4), and the slide groove (61) is provided on the slide bracket (6).

7. The seat-back linkage mechanism with independent backrest adjustment function according to claim 6, characterized in that: The surfaces of the slideway bracket (6) and the slide groove (61) are provided with a plastic coating layer.

8. The seat-back linkage mechanism with independent backrest adjustment function according to claim 1, characterized in that: The seat basin bracket (51) is welded and fixed on the front transverse tube of the seat frame framework (5), and the seat basin bracket (51) is hinged in the slide groove (61) through step bolts and nuts.

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