Seat frame rear lifting mechanism linked to backrest

Abstract

The present invention discloses a seat frame rear lifting mechanism linked with a backrest, comprising a seat frame and a backrest rotatably mounted at the rear end of the seat frame, a support body is provided at the rear end of the seat frame, a swing arm is connected to the end of the support body, an end of the swing arm away from the support body is rotatably mounted on the seat frame, and the swing arm rotation can drive the support body to move along the height direction of the seat frame; a linkage mechanism is provided between the backrest and the swing arm, and during the backward rotation of the backrest, the linkage mechanism is used to drive the swing arm to rotate relative to the seat frame. The beneficial effects of the present invention are: it can make up for the height difference between the rear end of the seat frame and the backrest, and effectively support the rear side of the occupant's buttocks, so that the occupant can lie completely flat, and the occupant has better comfort in the lying position mode.

Description

Technical Field

[0001] The invention relates to the technical field of automobile seats, and in particular to a seat frame rear side lifting mechanism linked to a backrest. Background Art

[0002] The comfort of seats plays a vital role in the user's driving experience. Nowadays, both automobile manufacturers and consumer terminals have put forward more stringent requirements on the comfort of car seats.

[0003] Most car seats on the market can be reclined, especially those in mid- to high-end models. The main purpose of reclining is to facilitate users to rest in a lying position. However, in existing seat structures, after the backrest is reclined, there is a certain gap between the rear end of the seat frame and the backrest support plane, which will lead to a lack of support for the back of the user's buttocks, or even a significant suspension state, and the user's comfort experience when lying flat is poor. Summary of the invention

[0004] In view of this, the present invention provides a seat frame rear side lifting mechanism linked to a backrest, which can automatically compensate for the height difference between the rear end of the seat frame and the backrest when the backrest is flattened.

[0005] To achieve the above purpose, the technical solution of the present invention is as follows:

[0006] A seat frame rear lifting mechanism linked to a backrest comprises a seat frame and a backrest rotatably mounted at the rear end of the seat frame, the key points of which are: a support body is provided at the rear end of the seat frame, a swing arm is connected to the end of the support body, an end of the swing arm away from the support body is rotatably mounted on the seat frame, and the rotation of the swing arm can drive the support body to move along the height direction of the seat frame; a linkage mechanism is provided between the backrest and the swing arm, and during the backward rotation of the backrest, the linkage mechanism is used to drive the swing arm to rotate relative to the seat frame.

[0007] With the above structure, when the seat back is folded backward, the linkage mechanism drives the support body to lift upward along the height direction of the seat frame, which can make up for the height difference between the rear end of the seat frame and the backrest, and provide effective support for the back of the occupant's buttocks, allowing the occupant to lie completely flat, significantly improving the user's comfort experience when lying flat.

[0008] Preferably, the linkage mechanism includes a traction rope and a first roller, one end of the traction rope is connected to the backrest, and the other end is connected to the swing arm, the first roller is rotatably mounted on the seat frame at a position above the swing arm, and the traction rope is supported on the first roller. With the above structure, when the backrest is tilted backward, the swing arm can be driven to rotate by the movement of the traction rope, thereby achieving the purpose of lifting the support body.

[0009] As a preferred embodiment: one end of the swing arm is hinged to the middle of the seat frame side plate, and the other end is fixed to the end of the support body, the traction rope is connected to the swing arm through an idle stroke component, wherein the traction rope is connected to the upper end of the idle stroke component, the middle of the swing arm is provided with a support shaft extending along the width direction of the seat frame, and the idle stroke component is provided with a strip hole that is slidably sleeved with the support shaft. With the above structure, there is an idle stroke section during the backward rotation of the backrest, that is: the early strip hole slides on the support shaft and does not drive the support body to lift upward, so that it can ensure that when the passenger normally adjusts the backrest inclination, the posture of his buttocks does not change.

[0010] Preferably, a spring is hung on one end of the idle stroke component away from the traction rope, and the other end of the spring is hung on the swing arm. With the above structure, when the lifting mechanism is retracted, all components can be ensured to be in a taut posture to prevent the components from shaking.

[0011] As a preferred embodiment, the backrest is rotatably mounted on the rear end of the seat frame via a rotating shaft, a traction arm extending downward is fixedly provided on the rotating shaft, one end of the traction rope close to the backrest is fixedly connected to the traction arm, a second roller is rotatably mounted on the rotating shaft, a third roller is rotatably mounted at a position below the rotating shaft at the rear end of the seat frame, and the traction rope is supported on the third roller and the second roller in sequence in a direction away from the traction arm. With the above structure, the movement of the traction rope can be controlled by rotating the backrest backward, thereby driving the swing arm at the front end to rotate.

[0012] Preferably, the lower end of the traction arm is provided with a slot that runs through the front and rear sides thereof, and the end of the traction rope is connected to a limiting ball, the diameter of which is larger than the slot width. The above structure is adopted to facilitate the rapid installation of the traction rope.

[0013] As a preferred embodiment, the seat frame is provided with a fourth roller and an adapter, and the middle part of the traction rope is supported on the fourth roller and the adapter. The above structure can guide the traction rope and avoid other structures of the seat.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. After the seat back is folded back, the support body rises upward along the height direction of the seat frame, which can make up for the height difference between the rear end of the seat frame and the backrest, and provide effective support for the back of the occupant's buttocks, allowing the occupant to lie completely flat, significantly improving the user's comfort experience when lying flat.

[0016] 2. The backrest linkage is used to drive the support body to lift, which reduces the number of driving mechanisms on the seat. The components of the linkage mechanism and their assembly layout are reasonably designed, with high production and assembly reliability and good market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a car seat;

[0018] Figure 2 for Figure 1 A partial enlarged view of point Ⅰ in the middle;

[0019] Figure 3 It is a schematic diagram of the partial structure of the linkage mechanism connecting the backrest and the swing arm (the backrest and the seat frame are not shown);

[0020] Figure 4 It is a structural schematic diagram of the swing arm;

[0021] Figure 5 It is a schematic diagram of the structure of the empty stroke components. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with embodiments and drawings.

[0023] like Figure 1 , 2 As shown in Figure 3, a car seat comprises a seat frame 1, a backrest A is rotatably and adjustably installed at the rear end of the seat frame 1 through a rotating shaft 5, side panels 1a are fixedly installed on both sides of the seat frame 1, a support body 2 is provided at the rear end of the seat frame 1, the support body 2 is in a strip-shaped structure, and is horizontally arranged along the width direction of the seat frame 1, a swing arm 3 is fixedly connected to the end of the support body 2, the swing arm 3 extends forward relative to the support body 2, and the swing arm 3 is hinged to the middle part of the side panel 1a through the mounting hole b at the front end, and a linkage mechanism 4 is arranged between the backrest A and the swing arm 3. During the process of the backrest A being folded backward around the rotating shaft 5, the linkage mechanism 4 drives the swing arm 3 to rotate, and the rotation of the swing arm 3 drives the support body 2 to be lifted upward along the height direction of the seat frame 1, thereby achieving the purpose of compensating for the height difference between the rear end of the seat frame 1 and the backrest A, so that the seat backrest A can be folded down to a truly flat posture. In this way, after the occupant lies flat on the seat, the back of his or her buttocks can be fully supported by the support body 2, which significantly improves the user's comfort experience of lying flat.

[0024] For example Figure 2 and 3As shown, in this embodiment, the components involved in the linkage mechanism 4 include: a third roller 4f, a second roller 4e, an adapter 4h, a fourth roller 4g, a first roller 4a, an idle stroke component 4c, a spring 4d and a traction rope 4b, wherein the third roller 4f, the adapter 4h, the fourth roller 4g and the first roller 4a are all rotatably mounted on the inner side of the side plate 1a of the seat frame 1, the second roller 4e is rotatably mounted on the rotating shaft 5, and a traction arm 6 extending downward is fixedly mounted on the rotating shaft 5, and one end of the traction rope 4b is fixed on At the lower end of the traction arm 6, the traction rope 4b is supported on the third roller 4f, the second roller 4e, the adapter 4h, the fourth roller 4g and the first roller 4a in sequence in the direction away from the traction arm 6. The traction rope 4b passes through one end of the first roller 4a and is connected to the idle stroke component 4c. In this embodiment, the third roller 4f is located below the second roller 4e. The third roller 4f is located behind the traction arm 6, so when the backrest 1 rotates backward, the lower end of the traction arm 6 will move forward, thereby pulling the traction rope 4b to move.

[0025] For example Figure 4 and 5 As shown, a support shaft 3a extending along the width direction of the seat frame 1 is provided in the middle of the swing arm 3, and a strip hole 4c1 is provided in the middle of the idle stroke component 4c. The strip hole 4c1 is slidably mounted on the support shaft 3a. The two ends of the idle stroke component 4c are respectively connected to the traction rope 4b and the spring 4d, and the other end of the spring 4d is connected to the swing arm 3.

[0026] The movement process of the seat frame rear lifting mechanism linked to the backrest provided in this embodiment is as follows:

[0027] Please refer to Figure 3 , the backrest 1 rotates backward → the rotating shaft 5 rotates → the lower end of the traction arm 6 rotates forward → the traction rope 4b moves → the idle stroke component 4c rotates from inclined to vertical → the strip hole 4c1 of the idle stroke component 4c slides upward relative to the support shaft 3a → the swing arm 3 rotates upward around the mounting hole b → the support body 2 is lifted upward.

[0028] In the above movement process, the idle stroke part 4c rotates from tilt to vertical stage, and the strip hole 4c1 slides upward relative to the support shaft 3a, both belong to the idle stroke, during which the swing arm 3 and the support body 2 do not move. Such a design can ensure that the passenger's buttocks posture does not change when the passenger normally adjusts the backrest inclination.

[0029] like Figure 3As shown, in order to facilitate the installation of the end of the traction rope 4b on the lower end of the traction arm 6, a slot 6a is provided at the lower end of the traction arm 6, which runs through the front and rear sides thereof, and the end of the traction rope 4b is connected to a limiting ball a, the diameter of which is larger than the slot width of the slot 6a. The fourth roller 4g and the adapter 4h installed on the side plate 1a of the seat frame 1 can make the traction rope 4b avoid other structures of the seat, thereby facilitating product assembly.

[0030] like Figure 2 As shown, when the user sits normally on the seat frame 1, in order to ensure the supporting strength of the support body 2 for the buttocks, a bearing component 7 is provided at the rear end of the seat frame 1 corresponding to the position below the support body 2, that is, the support body 2 is supported on the bearing component 7 in a folded state.

[0031] For example Figure 1 , 2 As shown, the rear end of the seat spring 1b of the seat frame 1 is connected to the support body 2. After the support body 2 is lifted upward, the seat spring 1b is deformed accordingly, which can ensure a smooth transition between the support body 2 and the seat frame 1 and avoid the discomfort caused by the obvious upward protrusion of the support body 2.

[0032] In order to ensure the stability of the linkage movement between the support body 2 and the backrest 1 , swing arms 3 and linkage mechanisms 4 are installed at both ends of the support body 2 .

[0033] The traction rope 4b may also be connected to the backrest 1 without passing through the second roller 4e, the third roller 4f and the traction arm 6, but may be directly fixedly connected to any position of the backrest 1, as long as the backrest 1 can be rotated backward to pull the traction rope 4b to move.

[0034] 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 seat frame rear lifting mechanism linked to a backrest, comprising a seat frame (1) and a backrest (A) rotatably mounted on the rear end of the seat frame (1), characterized in that: A support body (2) is provided at the rear end of the seat frame (1); an end of the support body (2) is connected to a swing arm (3); an end of the swing arm (3) away from the support body (2) is rotatably mounted on the seat frame (1); the rotation of the swing arm (3) can drive the support body (2) to move along the height direction of the seat frame (1); a linkage mechanism (4) is provided between the backrest (A) and the swing arm (3); during the process of the backrest (A) rotating backward, the linkage mechanism (4) is used to drive the swing arm (3) to rotate relative to the seat frame (1); The linkage mechanism (4) comprises a traction rope (4b), one end of which is connected to the backrest (A) and the other end of which is connected to the swing arm (3). When the backrest (A) tilts backward, the swing arm (3) can be driven to rotate by the movement of the traction rope (4b); one end of the swing arm (3) is hinged to the middle of the side plate (1a) of the seat frame (1), and the other end is fixed to the end of the support body (2); the traction rope (4b) and the swing arm (3) are connected via an idle stroke component (4c), wherein the traction rope (4b) is connected to the upper end of the idle stroke component (4c); a support shaft (3a) extending along the width direction of the seat frame (1) is provided in the middle of the swing arm (3); and a strip hole (4c1) slidably sleeved with the support shaft (3a) is provided on the idle stroke component (4c).

2. The seat frame rear lifting mechanism linked to the backrest according to claim 1, characterized in that: A spring (4d) is hung on one end of the idle stroke component (4c) away from the traction rope (4b), and the other end of the spring (4d) is hung on the swing arm (3).

3. The seat frame rear lifting mechanism linked to the backrest according to claim 1, characterized in that: The seat frame (1) is rotatably mounted with a first roller (4a) at a position above the swing arm (3), and the traction rope (4b) is supported on the first roller (4a); The backrest (A) is rotatably mounted on the rear end of the seat frame (1) via a rotating shaft (5); a traction arm (6) extending downward is fixedly provided on the rotating shaft (5); one end of the traction rope (4b) close to the backrest (A) is fixedly connected to the traction arm (6); a second roller (4e) is rotatably mounted on the rotating shaft (5); a third roller (4f) is rotatably mounted at a position below the rear end of the seat frame (1) corresponding to the rotating shaft (5); and the traction rope (4b) is supported on the third roller (4f) and the second roller (4e) in sequence in a direction away from the traction arm (6).

4. The seat frame rear side lifting mechanism linked with the backrest according to claim 3, characterized in that: The lower end of the traction arm (6) is provided with a slot (6a) penetrating the front and rear sides thereof, and the end of the traction rope (4b) is connected to a limiting ball (a), the diameter of the limiting ball (a) being greater than the slot width of the slot (6a).

5. The seat frame rear side lifting mechanism linked with the backrest according to claim 3, characterized in that: The seat frame (1) is provided with a fourth roller (4g) and an adapter (4h), and the middle part of the traction rope (4b) is supported on the fourth roller (4g) and the adapter (4h).

6. The seat frame rear side lifting mechanism linked with the backrest according to claim 1, characterized in that: The support body (2) is constructed as a strip-shaped structure disposed transversely along the width direction of the seat frame (1), and the rear end of the seat spring (1b) of the seat frame (1) is connected to the support body (2).

7. The seat frame rear lifting mechanism linked to the backrest according to claim 1, characterized in that: A bearing component (7) is provided at the rear end of the seat frame (1) at a position corresponding to the bottom of the support body (2).

8. The seat frame rear lifting mechanism linked to the backrest according to claim 1, characterized in that: Both ends of the support body (2) are provided with swing arms (3) and linkage mechanisms (4).

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