Mechanism for quickly returning backrest and preventing secondary injury in zero-gravity posture of automobile seat

Abstract

The utility model discloses a zero-gravity posture backrest quick return and secondary damage prevention mechanism of an automobile seat, which is characterized in that a backrest framework is rotatably connected to a cushion framework through angle adjusters on two sides, and a backrest energy absorption lock comprises a backrest energy absorption friction disc, a toothed plate, a locking cam and a backrest connecting plate fixed on the backrest framework, the backrest energy-absorbing friction disc comprises an inner disc and an outer disc which can rotate relatively, the inner disc is fixedly connected to the backrest connecting plate, the outer disc is fixedly connected to the angle adjuster, a ratchet wheel is arranged on the outer disc, ratchets are arranged at the front end of the toothed plate, the toothed plate and the middle of the locking cam are rotationally connected to the backrest connecting plate, and the upper end of the toothed plate is connected with the upper end of the locking cam through a tension spring. The lower end of the locking cam abuts against the toothed plate under the elastic action of the tension spring to limit rotation of the inner disc relative to the outer disc. When an automobile is collided, the power device can drive the locking cam to rotate and unlock, so that the backrest framework can overturn forwards. According to the utility model, the backrest can return quickly during collision, and secondary injury caused by rebounding of the backrest can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile seats, in particular to a zero-gravity posture backrest quick return and secondary injury prevention mechanism for an automobile seat. Background Art

[0002] The zero-gravity seat is an innovative seat that will be widely used in future driving scenarios. When using a zero-gravity seat, the person is in a lying position and the adjustment range of the seat belt is limited. In an emergency, the seat belt's restraint on the body is not as strong as in a normal sitting position, posing a safety hazard. Although high-end vehicles now have a pre-collision mode that automatically returns the backrest of the zero-gravity seat, there is still a problem of untimely return, resulting in the seat belt being unable to function. Moreover, after the backrest returns to the designed position, it is easy to rebound and cause secondary injury. Utility Model Content

[0003] In response to the problems existing in the above-mentioned prior art, the present utility model aims to provide a car seat zero-gravity posture backrest with a quick return and secondary injury prevention mechanism. When the vehicle collides, the zero-gravity posture backrest can quickly return to the designed position, allowing the safety system to play a protective role and reduce the damage to the human body during the collision. It can also ensure that after the backrest returns to the designed position, it will not rebound and cause secondary injury.

[0004] In order to achieve the above-mentioned purpose, the utility model proposes a zero-gravity posture backrest of a car seat with rapid return and anti-secondary injury mechanism, including a backrest frame and an angle adjuster, the backrest frame is rotatably connected to the seat cushion frame through the angle adjusters on both sides, and also includes a backrest energy-absorbing lock arranged between the backrest frame and the angle adjuster, the backrest energy-absorbing lock includes a backrest energy-absorbing friction disk, a tooth plate, a locking cam and a backrest connecting plate fixed to the backrest frame, the backrest energy-absorbing friction disk includes an inner disk and an outer disk which can rotate relative to each other, the inner disk is fixedly connected to the backrest connecting plate, the outer disk is fixedly connected to the angle adjuster, a ratchet is provided on the outer disk, a ratchet is provided at the front end of the tooth plate, the middle part of the tooth plate is rotatably connected to the backrest connecting plate, and the upper end of the tooth plate is connected to the The upper ends of the locking cams are connected by a tension spring, and the tension spring has an elastic force that drives the ratchet teeth of the toothed plate to engage with the ratchet wheel. The middle part of the locking cam is rotatably connected to the backrest connecting plate, and the lower end of the locking cam abuts against the toothed plate under the elastic force of the tension spring, so that the toothed plate and the ratchet wheel are engaged and locked, thereby limiting the rotation of the inner plate relative to the outer plate; the upper end of the locking cam is connected to a power device, and when the car collides, the power device can drive the locking cam to rotate to achieve the separation of the locking cam and the toothed plate, so that the toothed plate can rotate forward relative to the ratchet wheel, thereby allowing the backrest frame to flip forward; the front end of the ratchet wheel is provided with an extreme position stop point, and when the backrest frame returns forward to the designed position, the toothed plate is limited at the extreme position stop point.

[0005] In the above scheme: the power device is a detonator, which is connected to the locking cams on both sides through two pull wires. When the car collides, the detonator receives a signal and detonates, while tightening the pull wires on the left and right sides and keeping the pull wires taut.

[0006] In the above solution, a rotating shaft is coaxially provided on the inner plate of the backrest energy-absorbing friction plate, and the lower end of the backrest connecting plate is sleeved and welded on the rotating shaft to achieve fixed connection with the inner plate, which has a simple structure and is easy to assemble.

[0007] In the above solution, the outer disc of the backrest energy-absorbing friction disc is fixedly connected to the recliner via the inner connecting plate, which has a simple structure and is easy to assemble.

[0008] In the above embodiment, the locking cam is positioned above and in front of the toothed plate. The tension spring exerts a force to drive the toothed plate clockwise, thereby engaging the toothed plate ratchet teeth with the ratchet wheel. The tension spring also exerts a force to drive the locking cam counterclockwise, thereby causing the lower end of the locking cam to abut against the toothed plate. The tension spring is connected between the locking cam and the toothed plate, exerting a force to rotate both the toothed plate and the locking cam, resulting in a simple structure and an ingenious design.

[0009] The beneficial effects of the utility model are:

[0010] 1. After a collision, the backrest in zero-gravity position (adjusted to a larger angle) can quickly return to the designed position, allowing the safety system to play its protective role and reduce the damage to the human body caused by the collision;

[0011] 2. The energy-absorbing friction disc of the backrest can absorb the rotational energy transmitted to the backrest during collision, reducing the damage value;

[0012] 3. The tooth plate rotates relative to the ratchet wheel in a one-way adjustment structure, and the backrest can only move forward. When the backrest returns to the designed position, the tooth plate ratchet hits the limit position stop point, and the backrest cannot move forward any further, maintaining the front and rear bidirectional locking, thereby preventing the backrest from rebounding and causing secondary injury;

[0013] 4. It does not affect the normal adjustment of the backrest, and the regular backrest flip adjustment can be performed by driving the angle adjuster with a motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] Figure 1 This is a schematic diagram of the seat in zero gravity state.

[0016] Figure 2 This is a diagram of the seat backrest status when it returns to the designed position.

[0017] Figure 3This is a schematic diagram of the backrest frame.

[0018] Figure 4 This is a schematic diagram of the left side backrest energy absorption lock.

[0019] Figure 5 This is a schematic diagram of the left side backrest energy absorption lock in normal use.

[0020] Figure 6 This is a schematic diagram of the state of the left side backrest energy absorption lock after a collision.

[0021] Figure 7 This is a diagram of the ratchet teeth of the gear plate jumping open when the left side backrest energy absorption lock rotates forward after a collision.

[0022] Figure 8 This is a schematic diagram of the left side backrest energy absorption lock returning to the designed position after a collision. DETAILED DESCRIPTION

[0023] like Figure 1 As shown in FIG8 , a zero-gravity posture backrest of a car seat can quickly return to its original position and prevent secondary injuries, which mainly consists of a backrest frame 1, a recliner 2 and a backrest energy-absorbing lock.

[0024] The backrest frame 1 is rotatably connected to the seat cushion frame via recliners 2 on either side. A backrest energy-absorbing lock is located between the backrest frame 1 and the recliners 2. The lock comprises a backrest energy-absorbing friction disc 3, a toothed plate 4, a locking cam 5, and a backrest connecting plate 6 fixed to the backrest frame 1. The backrest energy-absorbing friction disc 3 comprises an inner disc and an outer disc that can rotate relative to each other. The inner disc is fixed to the backrest connecting plate 6, while the outer disc is fixed to the recliner 2. A ratchet 31 is mounted on the outer disc. A ratchet is provided at the front end of the tooth plate 4, and the middle part of the tooth plate 4 is rotatably connected to the backrest connecting plate 6. The upper end of the tooth plate 4 and the upper end of the locking cam 5 are connected by a tension spring 7. The tension spring 7 has an elastic force that drives the ratchet of the tooth plate 4 to engage with the ratchet wheel 31. The middle part of the locking cam 5 is rotatably connected to the backrest connecting plate 6, and the lower end of the locking cam 5 abuts against the tooth plate 4 under the action of the elastic force of the tension spring 7, so that the tooth plate 4 and the ratchet wheel 31 are engaged and locked, thereby limiting the rotation of the inner disk relative to the outer disk.

[0025] The upper end of the locking cam 5 is connected to a power device. When the car collides, the power device can drive the locking cam 5 to rotate to separate the locking cam 5 from the tooth plate 4, so that the tooth plate 4 can rotate forward relative to the ratchet 31, thereby allowing the backrest frame 1 to flip forward.

[0026] An extreme position stop point 311 is provided at the front end of the ratchet 31. When the backrest frame 1 returns forward from the zero gravity position (or adjusted backward at a larger angle) to the designed position, the tooth plate 4 is limited at the extreme position stop point 311. The designed position is the normal leaning position of the seat back.

[0027] Preferably, the power device is a detonator 8, which is connected to the locking cams 5 on both sides through two pull wires 9. When the car collides, the detonator 8 receives a signal and detonates, while tightening the pull wires 9 on the left and right sides and keeping the pull wires 9 in a taut state.

[0028] Preferably, a rotating shaft is coaxially provided on the inner plate of the backrest energy-absorbing friction plate 3, and the lower end of the backrest connecting plate 6 is sleeved and welded on the rotating shaft to achieve fixed connection with the inner plate, which has a simple structure and is easy to assemble.

[0029] Preferably, the outer disc of the backrest energy-absorbing friction disc 3 is fixedly connected to the recliner 2 via the inner connecting plate 10, which has a simple structure and is easy to assemble.

[0030] Preferably, the locking cam 5 is disposed above and in front of the toothed plate 4, and the tension spring 7 has a force that drives the toothed plate 4 to rotate clockwise so that the ratchet teeth of the toothed plate 4 engage with the ratchet wheel 31. The tension spring 7 also has a force that drives the locking cam 5 to rotate counterclockwise so that the lower end of the locking cam 5 abuts against the toothed plate 4. The tension spring 7 is connected between the locking cam 5 and the toothed plate 4 and has a force that drives both the toothed plate 4 and the locking cam 5 to rotate, resulting in a simple structure and an ingenious design.

Claims

1. A zero-gravity posture backrest quick return and secondary injury prevention mechanism for a car seat, comprising a backrest frame (1) and a recliner (2), wherein the backrest frame (1) is rotatably connected to a seat cushion frame via the recliners (2) on both sides, and is characterized in that: The utility model also includes a backrest energy absorption lock arranged between the backrest frame (1) and the angle adjuster (2), the backrest energy absorption lock including a backrest energy absorption friction disc (3), a tooth plate (4), a locking cam (5) and a backrest connecting plate (6) fixed on the backrest frame (1), the backrest energy absorption friction disc (3) including an inner disc and an outer disc which can rotate relative to each other, the inner disc being fixed on the backrest connecting plate (6), the outer disc being fixed on the angle adjuster (2), the outer disc being provided with a ratchet (31), the front end of the tooth plate (4) being provided with ratchet teeth, the middle part of the tooth plate (4) being rotatably connected to the backrest connecting plate (6), the upper end of the tooth plate (4) and the upper end of the locking cam (5) being connected via a tension spring (7), the tension spring (7) having an elastic force for driving the ratchet teeth of the tooth plate (4) to engage with the ratchet (31), and the locking cam (5) being provided with a ratchet. The middle part of the cam (5) is rotatably connected to the backrest connecting plate (6), and the lower end of the locking cam (5) abuts against the tooth plate (4) under the elastic force of the tension spring (7), so that the tooth plate (4) and the ratchet (31) are engaged and locked, thereby limiting the rotation of the inner plate relative to the outer plate; the upper end of the locking cam (5) is connected to a power device, and when the car collides, the power device can drive the locking cam (5) to rotate to achieve the separation of the locking cam (5) and the tooth plate (4), thereby allowing the tooth plate (4) to rotate forward relative to the ratchet (31), thereby allowing the backrest frame (1) to flip forward; the front end of the ratchet (31) is provided with an extreme position stop point (311), and when the backrest frame (1) returns forward to the designed position, the tooth plate (4) is limited at the extreme position stop point (311).

2. The zero-gravity posture quick return and secondary injury prevention mechanism for a car seat according to claim 1, characterized in that: The power device is a detonator (8), and the detonator (8) is connected to the locking cams (5) on both sides through two pull wires (9).

3. The zero-gravity posture quick return and secondary injury prevention mechanism for a car seat according to claim 1, characterized in that: A rotating shaft is coaxially provided on the inner disc of the backrest energy-absorbing friction disc (3), and the lower end of the backrest connecting plate (6) is sleeved and welded on the rotating shaft to achieve fixed connection with the inner disc.

4. The zero-gravity posture quick return and secondary injury prevention mechanism for a car seat according to claim 1, characterized in that: The outer disc of the backrest energy-absorbing friction disc (3) is fixedly connected to the angle adjuster (2) via an inner connecting plate (10).

5. The zero-gravity posture quick return and secondary injury prevention mechanism for a car seat according to claim 1, characterized in that: The locking cam (5) is arranged in the upper front of the tooth plate (4); the tension spring (7) has an elastic force driving the tooth plate (4) to rotate clockwise so that the ratchet teeth of the tooth plate (4) engage with the ratchet wheel (31); the tension spring (7) also has an elastic force driving the locking cam (5) to rotate counterclockwise so that the lower end of the locking cam (5) abuts against the tooth plate (4).

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