A flexible adjustable seat back frame structure for a vehicle seat

Abstract

This invention discloses a flexible adjustable seat back frame structure for a vehicle seat, including a seat back frame with sliding mechanisms on both sides of its bottom. The seat back frame is connected to the seat base via the sliding mechanisms. Each sliding mechanism includes a first sliding plate and a second sliding plate rotatably connected to each other, with their opposite surfaces meshing. The sliding mechanism also includes an axial elastic element connected to either the first or second sliding plate. When the seat back frame is subjected to a backward tilting force, an axial force is generated between the meshing surfaces of the first and second sliding plates, acting on the axial elastic element to cause axial displacement of the first and second sliding plates, disengaging them and allowing the seat back to tilt. This invention allows the seat back to tilt backward, creating additional space when the occupant is impacted from the front, thus improving safety.

Description

Technical Field

[0001] This invention relates to a seat frame structure, and more particularly to a vehicle seat backrest frame structure with elastic adjustment. Background Technology

[0002] Currently, to enhance driving and riding comfort, automobiles are placing increasingly higher demands on the comfort and safety of car seats. In recent years, safety considerations for seats have primarily focused on providing more space for front-seat occupants in extreme situations. Existing vehicle seats, including car seats and aircraft seats, mostly employ a one-piece, rigid backrest frame design, further enhancing comfort through bolstering and back support. Fixed seats have the backrest fixed to the base, while adjustable seats have the backrest fixed to the base via an adjuster used to adjust the backrest angle. Regardless of whether the seat is fixed or adjustable, in the event of an accident where the front of the occupant is subjected to compression, the seat back and the object pressing against them will continue to compress the occupant. Summary of the Invention

[0003] To address the shortcomings of the prior art, this invention provides a flexible adjustable seat back frame structure for vehicle seats, solving the problem of the seat back being unable to move when the front of the passenger is compressed.

[0004] The technical solution of the present invention is as follows: A flexible adjustable seat back frame structure for a vehicle seat, including a seat back frame, with sliding devices provided at the bottom of both sides of the seat back frame. The seat back frame is connected to the seat base through the sliding devices. The sliding device includes a first sliding plate and a second sliding plate that are rotatably connected to each other. The opposite surfaces of the first sliding plate and the second sliding plate are engaged with each other. The sliding device includes an axial elastic element connected to the first sliding plate or the second sliding plate. When the seat back frame is subjected to a backward tilting force, an axial force is generated between the meshing surfaces of the first sliding plate and the second sliding plate, which acts on the axial elastic element, causing the first sliding plate and the second sliding plate to undergo axial displacement, disengage, and slide.

[0005] Furthermore, the first slide and the second slide are provided with meshing teeth on their meshing surfaces, and one side of the meshing teeth is provided as a slope or a rounded chamfer.

[0006] Furthermore, the axial elastic element is a disc spring, the first slide is provided with a rotating shaft, the second slide is sleeved on the rotating shaft, the inner ring of the disc spring is connected to the rotating shaft of the first slide, and the outer ring of the disc spring presses against the surface of the second slide.

[0007] Furthermore, it includes an angle adjuster, which is fixedly connected to the first slide.

[0008] Furthermore, the chair back frame includes an upper frame and a lower frame, with the swivel mechanism disposed on the lower frame. The upper frame and the lower frame are connected by a longitudinal elastic spring. Utilizing the elastic force of the spring, when the bottom of the chair back frame can no longer rotate, the upper part can be further tilted back to obtain more forward space. The elastic spring also allows the chair back to provide a certain degree of elastic support during normal seating, improving comfort.

[0009] To further improve riding comfort, the elastic springs extend upward and downward to the top of the upper frame and the bottom of the lower frame, respectively, and the elastic springs are configured to conform to the curvature of the human spine.

[0010] Furthermore, the elastic springs extend upward and downward to the top of the upper frame and the bottom of the lower frame, respectively, and an adjustable forward-protruding back support plate is provided on the elastic springs located on the upper frame.

[0011] Furthermore, several strip-shaped elastic elements are connected between the back support plate and the two sides of the upper frame.

[0012] Furthermore, the upper frame includes a left side, a middle side, and a right side, with the left side and the right side connected to the middle side via transverse springs. This allows the left and right sides of the upper frame to be flipped forward and backward at a certain angle, better conforming to the movement of the human back.

[0013] Furthermore, a headrest connection hole is provided at the top of the middle section.

[0014] The advantages of the technical solution provided by this invention are as follows:

[0015] The design utilizes a sliding mechanism that rotates under significant torque while maintaining engagement under normal conditions. This allows the seat back to recline and increase interior space when the occupant is subjected to forward impact or pressure, thus improving safety. The structure is simple. Furthermore, the use of elastic springs to segment the upper and lower sections of the seat back enhances its flexibility. Combined with lateral springs for left and right segmentation, this improves comfort and allows the seat back to recline further, increasing safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the elastically adjustable seat back frame structure of a vehicle seat in an embodiment.

[0017] Figure 2 This is a front view schematic diagram of the elastically adjustable seat back frame structure of the vehicle seat in the embodiment.

[0018] Figure 3 This is a schematic diagram of the axial explosion structure of the slide.

[0019] Figure 4This is a schematic diagram of the meshing surfaces of the first and second slide plates of the rotary mechanism.

[0020] Figure 5 This is a schematic diagram of the upper frame structure of the chair back frame.

[0021] Figure 6 This is a schematic diagram of the lower frame structure of the chair back frame.

[0022] Figure 7 This is a schematic diagram of the back support driver. Detailed Implementation

[0023] The present invention will be further described below with reference to embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading this description, any modifications of this description in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0024] Please refer to Figures 1 to 4 As shown, the vehicle seat elastically adjustable backrest frame structure involved in this embodiment includes a backrest frame 1 mainly made of metal tubing. The bottom of the backrest frame 1 is connected to the seat base to form a complete seat frame. A soft covering material is wrapped around the seat frame to form the seat. Generally, in order to achieve adjustable backrest angle, a manual or electric angle adjuster 2 is installed between the backrest frame 1 and the seat base.

[0025] In this embodiment, the angle adjuster 2 is installed between the chair back frame 1 as follows: Figure 3 The slide mechanism 3 is shown. Specifically, the slide mechanism 3 is installed on both sides of the bottom of the chair back frame 1. The slide mechanism 3 consists of a first slide plate 301, a second slide plate 302, and an axial elastic element, which is a disc spring 303. Both the first slide plate 301 and the second slide plate 302 are disc-shaped, and their opposing surfaces are meshing surfaces. That is, meshing teeth 304 are provided on the meshing surfaces of the first slide plate 301 and the second slide plate 302, and these meshing teeth 304 are arranged circumferentially. A flange shaft 301a is provided in the middle of the first slide plate 301, and the second slide plate 302 is sleeved on the flange shaft 301a. The flange shaft 301a is provided with a groove 301b, and the inner ring of the disc spring 303 is engaged in the groove 301b of the flange shaft 301a. The back of the second slide plate 302 (the side opposite to the meshing surface) is provided with a circular groove 302a, and the outer ring of the disc spring 303 presses against the bottom of the circular groove 302a. During installation, the first slide plate 301 is connected to the adjuster 2, and the second slide plate 302 is connected to the chair back frame 1. A gap is left along the axial direction of the flange pivot 301a between the first slide plate 301 and the adjuster 2 or between the second slide plate 302 and the chair back frame 1 so that the first slide plate 301 and the second slide plate 302 can produce axial displacement.

[0026] Please combine Figure 4 As shown, the meshing tooth 304 has an approximately fan-shaped shape and two tooth surfaces along the radial direction of the first slide plate 301 and the second slide plate 302. The first tooth surface 304a is perpendicular to the surfaces of the first slide plate 301 and the second slide plate 302, while the second tooth surface 304b is machined into an inclined slope or chamfered. The first tooth surface 304a is the surface on which the first slide plate 301 and the second slide plate 302 contact when the chair back tilts forward, and the second tooth surface 304b is the surface on which the first slide plate 301 and the second slide plate 302 contact when the chair back tilts backward. Therefore, when the chair back is subjected to a large impact force and tilts backward, the action of the second tooth surface 304a will generate an axial component force on the first slide plate 301 and the second slide plate 302, which will act on the disc spring 303 to deform it, and then the first slide plate 301 and the second slide plate 302 will produce axial displacement and relative rotation. When the chair back is tilted forward, no axial force is generated by the action of the first tooth side 304a, or under normal use, the axial force generated by the action of the second tooth side 304b cannot overcome the elastic force of the disc spring 303, so the first slide plate 301 and the second slide plate 302 rotate together.

[0027] To improve seat comfort, the backrest frame 1 in this embodiment is structured as follows: Figure 5 , Figure 6 As shown, it includes an upper frame 101 and a lower frame 102, which are connected by a longitudinal elastic spring 4. The elastic spring 4 forms a certain curvature to fit the curve of the human spine. The upper frame 101 is divided into a left side part 101a, a middle part, and a right side part 101b. The middle part includes an upper crossbeam 101c and a lower crossbeam spring plate 101d. The upper crossbeam 101c, the left side part 101a, and the right side part 101b can be made of lightweight metal round tubes that are bent or flattened. The two headrest insertion tubes 101e are welded and fixed to the upper crossbeam 101c to form headrest connection holes. The upper parts of the left side part 101a and the right side part 101b are rigidly connected to the two ends of the upper crossbeam 101c through a transverse spring plate 101f. The lower parts of the left side part 101a and the right side part 101b are rigidly connected to the two ends of the lower crossbeam spring plate 101d. The transverse spring plate 101f and the lower crossbeam spring plate 101d have the same angle and the spring surfaces are parallel.

[0028] The lower frame 102 is rigidly connected in sequence by a left side plate 102a, a bottom beam 102b, a right side plate 102c, and a top beam 102d. The aforementioned swivel mechanism 3 and angle adjuster 2 are sequentially installed on the outer sides of the left side plate 102a and the right side plate 102c, respectively. The angle adjuster 2 is fixedly connected to the first slide plate 301 of the swivel mechanism 3, and the left side plate 102a and the right side plate 102c are connected to the second slide plate 302 of the swivel mechanism 3. A gap is provided between the left side plate 102a and the corresponding second slide plate 302 of the swivel mechanism 3, and between the right side plate 102c and the corresponding second slide plate 302 of the swivel mechanism 3, to allow for axial displacement of the second slide plate 302. Other functional components of the seat can be installed on the left side plate 102a and the right side plate 102c as needed. An angle adjuster drive motor 6 can be installed on the inner side of the left side plate 102a or the right side plate 102c, and the drive motor 6 drives the angle adjuster 2 through the shaft of the angle adjuster 2.

[0029] The lower end of the longitudinal elastic spring 4 is fixedly connected to the bottom beam 102b of the lower frame 102. The middle part of the longitudinal elastic spring 4 is fixedly connected to the top beam 102d of the lower frame 102 and the lower crossbeam spring 101d of the upper frame 101. The top of the longitudinal elastic spring 4 is fixedly connected to the upper crossbeam 101c in the middle of the upper frame 101. Please refer to... Figure 1 , Figure 2 As shown, a back support plate 5 is also provided on the portion of the longitudinal elastic spring 4 located on the upper frame 101. A longitudinal groove 501 is formed on the back support plate 5, and a sliding pin on the elastic spring 4 engages with the groove 501. A back support driver 7 is provided on the back side of the elastic spring 4 to adjust the forward protrusion of the back support plate 5. Figure 7As shown, the backrest drive 7 consists of a turbine cam 701, a backrest drive bracket 702, a worm gear 703, and a motor 704. The backrest drive bracket 702 is fixedly connected to the elastic spring 4, and the worm gear 703 is rigidly connected to the motor 704 and installed in the backrest drive bracket 702. The turbine cam 701 is installed in the backrest drive bracket 702. The turbine part of the turbine cam 701 cooperates with the worm gear 703. The turbine of the turbine cam 701 rotates in both directions from 0 to 90 degrees. The backrest plate 5 can be pushed forward by the turbine cam 701 or pressed against the elastic spring 4 as needed to improve comfort. Several connecting holes 502 are opened on both sides of the backrest plate 5. Elastic wires (not shown in the figure) are connected in the connecting holes, and the other end of the elastic wires are connected to the left side part 101a and the right side part 101b respectively. In the above embodiment, the horizontal spring 101f of the upper frame 101 and the lower crossbeam spring 101d allow the left side 101a and right side 101b to independently rotate back and forth to fit different back postures. At the same time, the longitudinal elastic spring 4 connects the upper frame 101 and the lower frame 102 to further increase the comfort of the chair back. In addition, when subjected to a large impact force from the front, in addition to the rotation of the slide 3, the upper frame 101 can also tilt back further to obtain more front space and improve safety.

Claims

1. A flexible adjustable seat back frame structure for a vehicle seat, characterized in that, The chair back frame includes a backrest frame with sliding mechanisms at the bottom of both sides. The backrest frame is connected to the seat base via the sliding mechanisms. Each sliding mechanism includes a first sliding plate and a second sliding plate that are rotatably connected to each other. The opposite surfaces of the first and second sliding plates mesh with each other. The sliding mechanism includes an axial elastic element connected to either the first or second sliding plate. When the backrest frame is subjected to a backward tilting force, an axial force is generated between the meshing surfaces of the first and second sliding plates, which acts on the axial elastic element, causing the first and second sliding plates to disengage axially and slide. The backrest frame includes an upper frame and a lower frame. The sliding mechanism is disposed on the lower frame. The upper frame and the lower frame are connected by a longitudinal elastic spring.

2. The vehicle seat elastically adjustable backrest frame structure according to claim 1, characterized in that, The first slide and the second slide have meshing teeth on their meshing surfaces, and one side of the meshing teeth is a slope or a rounded chamfer.

3. The vehicle seat elastically adjustable backrest frame structure according to claim 1, characterized in that, The axial elastic element is a disc spring. The first slide is provided with a rotating shaft, and the second slide is sleeved on the rotating shaft. The inner ring of the disc spring is connected to the rotating shaft of the first slide, and the outer ring of the disc spring presses against the surface of the second slide.

4. The vehicle seat elastically adjustable backrest frame structure according to claim 3, characterized in that, It includes an angle adjuster, which is fixedly connected to the first slide.

5. The vehicle seat elastically adjustable backrest frame structure according to claim 1, characterized in that, The elastic springs extend upward and downward to the top of the upper frame and the bottom of the lower frame, respectively, and the elastic springs are configured to conform to the curvature of the human spine.

6. The vehicle seat elastically adjustable backrest frame structure according to claim 1, characterized in that, The elastic springs extend upward and downward to the top of the upper frame and the bottom of the lower frame, respectively, and an adjustable forward-protruding back support plate is provided on the elastic springs located on the upper frame.

7. The vehicle seat elastically adjustable backrest frame structure according to claim 6, characterized in that, Several strip-shaped elastic elements are connected between the back support plate and the two sides of the upper frame.

8. The vehicle seat elastically adjustable backrest frame structure according to claim 1, characterized in that, The upper frame includes a left side, a middle side, and a right side. The left side and the right side are connected to the middle side by transverse springs, allowing the left and right sides of the upper frame to be flipped forward and backward at a certain angle, which better conforms to the movement of the human back.

9. The vehicle seat elastically adjustable backrest frame structure according to claim 8, characterized in that, The top of the middle section is provided with a headrest connection hole.

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