A seat cushion locking structure for a seat, a seat cushion frame assembly having the seat cushion locking structure, and a seat

Abstract

This invention relates to the field of seating, specifically to a seat cushion locking structure, a seat cushion frame assembly having the seat cushion locking structure, and a seat. The seat cushion locking structure includes a flip support unit, a pulling unit, and a rotating unit. The flip support unit includes a flip rib; the pulling unit includes a pull strap connected to the flip rib; the rotating unit includes a first rotating unit and a second rotating unit. Pulling the pull strap causes the flip rib to rotate around the first rotating unit; the seat cushion frame assembly and the flip rib can rotate relative to each other around the second rotating unit. The seat cushion locking structure disclosed in this invention can replace conventional seat cushion locking mechanisms. It has a simple overall structure and can achieve self-locking with the seat frame assembly. It eliminates the bulky independent locking mechanism, greatly simplifying the structure, reducing the number of parts, and significantly lowering material costs and assembly time.

Description

Technical Field

[0001] This invention relates to the field of seating, specifically to a seat cushion locking structure, a seat cushion frame assembly having the seat cushion locking structure, and a seat. Background Technology

[0002] In addition to their seating function, the front two seats can be folded down to create storage space underneath, making good use of the available space.

[0003] Current automotive front double seat cushions mostly use a seat base with an independent locking mechanism to achieve folding and fixing. This has the following drawbacks:

[0004] Independent lock bodies are bulky, have many parts, are expensive, and take up a lot of storage space under the seat cushion;

[0005] The seat cushion material is thin and lacks rigidity, resulting in poor vibration filtering when the vehicle is moving, and low riding comfort.

[0006] During a collision, the seat frame is prone to tilting and shifting forward, resulting in insufficient safety.

[0007] Metal parts are prone to friction noise when mated.

[0008] Therefore, in order to improve or solve at least one of the above technical problems, it is necessary to optimize the design of existing seats. Summary of the Invention

[0009] The purpose of this invention is to provide a seat cushion locking structure that can replace the traditional seat cushion locking mechanism.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] A seat cushion locking structure for a chair includes a flip support unit, a pulling unit, and a rotating unit;

[0012] The flip support unit is connected to the seat frame in the seat frame assembly;

[0013] The flip support unit includes a flip rib;

[0014] The pulling unit includes a pull strap connected to the flipping rib;

[0015] The rotating unit includes a first rotating unit and a second rotating unit;

[0016] The flip-up rib is connected to the seat frame via the first rotating unit;

[0017] The flip-up rib is connected to the steel mesh in the seat cushion frame assembly via the second rotating unit; the flip-up rib can be rotated around the first rotating unit by pulling the strap; the seat cushion frame assembly and the flip-up rib can rotate relative to each other around the second rotating unit.

[0018] The flipping rib includes a central rib; each of the two ends of the central rib is provided with a lateral rib.

[0019] The lateral stiffeners include secondary stiffeners and tertiary stiffeners; one end of the secondary stiffener is connected to the central stiffener via a secondary connecting rod, and the other end is connected to the tertiary stiffener via a primary connecting rod.

[0020] The central stiffeners, secondary stiffeners, and tertiary stiffeners are distributed in parallel at intervals.

[0021] The central reinforcing bar is connected to the pull strap in the pulling unit; the secondary reinforcing bar is connected to the second rotating unit; and the tertiary reinforcing bar is connected to the first rotating unit.

[0022] A seat cushion frame assembly includes a frame body and a seat cushion locking structure; the frame body includes a seat cushion frame body, and the seat cushion frame body is provided with a steel mesh; the seat cushion locking structure is connected to the steel mesh through a second rotating unit;

[0023] The second rotating unit includes a locking spring connected to the steel mesh; the locking spring has a limiting protrusion on the side near the flipping rib for limiting the flipping rib.

[0024] The seat cushion locking structure is connected to the steel mesh through two second rotating units; the two second rotating units are relatively symmetrically distributed; the two second rotating units are distributed on opposite sides of the flip-up rib.

[0025] The locking spring includes a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate being arranged perpendicularly; the first connecting plate is fixedly connected to the steel mesh.

[0026] The second connecting plate of the locking spring is provided with a limiting protrusion; the limiting protrusion protrudes towards the flipping rib;

[0027] The locking spring is provided with a fixing plate; the fixing plate and the locking spring can be connected in a detachable manner.

[0028] The fixed pressure plate and the locking spring plate can form a rotating inner cavity; the flipping rib is connected in the rotating inner cavity.

[0029] The steel reinforcement mesh includes multiple individual steel bars; adjacent individual steel bars are arranged intersecting or parallel; each individual steel bar includes a steel bar body, and the steel bar body is provided with connecting hooks at both ends; each connecting hook is connected to the steel bar body through a transition link, and the steel bar body and the connecting hook are staggered; the transition link is an arc-shaped structure.

[0030] The seat cushion frame assembly also includes an anti-submersion mechanism, a support unit, and / or a limiting structure; the anti-submersion mechanism includes an anti-submersion frame and an anti-noise pad; the anti-submersion frame is mounted on the frame body and is in the shape of an inverted L.

[0031] The limiting structure includes guide limiting steel bars set on the main frame; the guide limiting steel bars are provided with noise-absorbing felt;

[0032] The seat cushion frame assembly also includes a support unit; the support unit includes a support pad, which is connected to the seat cushion frame body in a detachable manner.

[0033] The seat cushion frame assembly includes two anti-submarine mechanisms and a limiting structure; the two limiting structures are distributed at relative intervals; the flip-up rib is connected to the seat frame through two first rotating units, and the flip-up rib is connected to the steel mesh through two second rotating units; the two first rotating units and the second rotating units are symmetrically distributed at intervals.

[0034] A limiting structure is provided on the extension line of the line connecting the center point of the first rotating unit and the center point of the second rotating unit on the same side as the flipping rib.

[0035] A seat includes a seat frame assembly, the seat frame assembly including a seat frame; the seat frame is provided with the seat cushion frame assembly; the seat frame includes a square tube upper frame; the support pad in the seat cushion frame assembly is in contact with the surface of the square tube upper frame.

[0036] The two second rotating units in the seat cushion frame assembly are respectively connected to two individual steel bars in the grid reinforcement; a flip-stabilizing steel bar is provided between the two individual steel bars connecting the second rotating units; the flip-stabilizing steel bar and the middle steel bar in the flip-stiffening bar are distributed in parallel at intervals; when the seat cushion frame assembly is stably arranged on the seat frame; the height of the central axis of the flip-stabilizing steel bar from the horizontal plane is greater than the height of the middle steel bar from the horizontal plane; the pull strap is arranged on the side of the flip-stabilizing steel bar away from the seat frame.

[0037] The first rotating unit includes a fixed bracket connected to the seat frame, and the fixed bracket and the seat frame can form a first rotating inner hole; the three-stage ribs in the flipping ribs are inserted into the corresponding first rotating inner hole; the limiting structure in the seat frame assembly also includes a limiting sheet metal disposed on the seat frame, the limiting sheet metal including a stepped overlapping plate; the stepped overlapping plate is provided with a connecting bracket; an insertion groove is formed between the connecting bracket and the stepped overlapping plate; the guide limiting steel bar in the limiting structure can be inserted into the insertion groove. The stepped overlapping plate includes a primary overlapping plate, a secondary overlapping plate, and a tertiary overlapping plate. Each of the two ends of the secondary overlapping plate has a primary overlapping plate and a tertiary overlapping plate respectively. The secondary overlapping plate intersects with the primary and tertiary overlapping plates. The stepped overlapping plate can be connected to the seat frame via the primary overlapping plate. The secondary overlapping plate and the primary overlapping plate are arranged on two sides of the square tube upper frame of the seat frame. One end of the connecting bracket is connected to the tertiary overlapping plate, and the other end extends freely. The connecting bracket is also a stepped plate structure.

[0038] The advantages of this invention are:

[0039] This invention discloses a seat cushion locking structure for a seat, a seat cushion frame assembly having the seat cushion locking structure, and a seat.

[0040] The seat cushion locking structure disclosed in this invention can replace conventional seat cushion locking mechanisms. Through the ingenious cooperation of the flipping ribs (including the central rib, secondary rib, and tertiary rib) and the first and second rotating units, it completely replaces the traditional independent lock body. The overall structure is simple and can achieve self-locking with the seat frame assembly. The bulky independent lock body mechanism is eliminated, greatly simplifying the structure, reducing the number of parts, and significantly lowering material costs and assembly time. At the same time, it frees up a large amount of space under the seat cushion, which can be used to increase storage capacity.

[0041] The first rotating unit uses a fixed bracket and a seat frame to form a first rotating inner hole, and the second rotating unit uses a locking spring and a fixed pressure plate to form a rotating inner cavity. The structure is simple and reliable, and no additional complex hinge parts are required.

[0042] The flip-up ribs and locking springs are integrated into the steel mesh of the seat cushion frame and the gaps in the seat frame, without any protruding large locking blocks. Compared to traditional independent locking mechanisms, this significantly saves space under the seat cushion, making it easier to place storage boxes or optimize the overall shape of the seat.

[0043] The flip-up rib is connected to the steel mesh via two symmetrically distributed second rotating units and to the seat frame via two first rotating units, forming a stable four-point flip-up locking system. When the pull strap is pulled, the flip-up rib rotates around the first rotating unit, while the seat cushion frame and the flip-up rib rotate relative to each other around the second rotating unit, resulting in a short unlocking stroke and low resistance.

[0044] The locking spring is equipped with a limiting protrusion, which works in conjunction with the flipping rib to achieve reliable limiting and prevent accidental disengagement; the fixing plate and the locking spring are detachably connected for easy maintenance.

[0045] The steel mesh uses individual steel bars with curved transition links and staggered connecting hooks, which are welded or arranged in an alternating pattern to form a high-strength mesh. Compared with traditional thin-plate seat basins, the bending stiffness and torsional stiffness are significantly improved, effectively attenuating road vibrations and improving vibration filtering during vehicle operation; at the same time, the curved transition links have a good anti-submarine effect.

[0046] The stabilizing reinforcing bar is arranged between the two second rotating units, and its height is higher than the middle reinforcing bar of the stabilizing bar. This arrangement allows the stabilizing bar to receive some upward force when the pull strap is pulled, thus preventing the pull force from being directed towards the first rotating unit and hindering the rotation of the stabilizing bar.

[0047] An integrated inverted L-shaped anti-submarine frame is symmetrically arranged on the inner front part of the frame body. In the event of a vehicle collision, the anti-submarine frame directly bears the impact force of the seat cushion tilting forward, effectively preventing the seat cushion frame from shifting forward (submerging or lurching forward), providing reliable passive safety protection for the occupants.

[0048] The noise-reducing pads are attached between the anti-submarine frame and the lower support frame to eliminate friction noise during normal use without affecting daily comfort.

[0049] The guide limit steel bars in the limit structure are pasted with noise-absorbing felt. When they are used in conjunction with the stepped overlapping plate limit sheet metal (insertion groove) on the seat frame, they completely isolate direct metal contact and eliminate friction noise during locking and vibration.

[0050] The guide and limiting steel bars at the rear end of the seat cushion frame and the limiting sheet metal (stepped overlapping plate structure) on the seat frame form an interlocking fit to ensure that the seat cushion can return to the precise position after each folding and reset; at the same time, it prevents the seat cushion frame assembly from detaching from the seat frame without external force.

[0051] A limiting structure is set on the extension line of the line connecting the center point of the first rotating unit and the center point of the second rotating unit on the same side, so that the force is transmitted along the optimal force transmission path when the unit is flipped and locked, thus avoiding off-center loading.

[0052] The support unit uses a detachable support pad to connect with the main body of the seat cushion frame and contacts the upper frame surface of the seat square tube, which facilitates height adjustment and replacement.

[0053] The fixing plate and locking spring are detachably connected, and the pull strap is arranged on the side away from the seat frame of the flip-up stabilizing steel bar, providing ample operating space and eliminating the need to disassemble a large number of parts during maintenance.

[0054] The entire locking and frame structure can use standardized steel bar specifications and welding / clamping processes, making it easy to adapt to the seat frames of different car models. The second rotating unit can be connected to different individual steel bars of the steel bar grid to adapt to different seat cushion widths and load requirements. Attached Figure Description

[0055] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0056] Figure 1 This is a schematic diagram of the seat cushion locking structure in this invention.

[0057] Figure 2 This is a schematic diagram of the seat cushion frame assembly in this invention.

[0058] Figure 3 This is a schematic diagram of the structure of the seat in this invention.

[0059] Figure 4 This is a schematic diagram of the seat cushion frame assembly after it is opened in this invention.

[0060] Figure 5 This is a partial structural diagram of the anti-submarine mechanism on the seat in this invention.

[0061] Figure 6 This is a schematic diagram of the seat cushion locking structure in the locked state of the present invention.

[0062] Figure 7 A schematic diagram of the seat cushion locking structure of the present invention when it is opened.

[0063] The markings in the above figures are all:

[0064] 1. Flip-over rib; 1-1. Seat cushion locking structure; 1-2. Seat cushion frame assembly; 1-31. Seat frame; 1-311. Square tube upper frame; 2. Strap; 3. Fixing bracket; 4. Fixing pressure plate; 5. Locking spring; 51. First connecting plate; 52. Second connecting plate; 53. Limiting protrusion; 6. Support pad; 7. Frame body; 1. Seat cushion frame body; 72. Steel mesh; 701. Individual steel bar; 721. Steel bar body; 72. 2. Connecting hook; 723. Transition link; 8. Limiting structure; 81. Guide limiting steel bar; 82. Noise-proof felt; 83. Limiting sheet metal; 831. Primary lap plate; 832. Secondary lap plate; 833. Tertiary lap plate; 834. Connecting bracket; 9. Tilting stabilizing steel bar; 10. Anti-submersion frame; 101. Noise-proof pad; 11. Central reinforcing bar; 12. Secondary reinforcing bar; 13. Tertiary reinforcing bar; 14. Primary connecting rod; 15. Secondary connecting rod. Detailed Implementation

[0065] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0066] A seat cushion locking structure 1-1 includes a flip support unit, a pulling unit, and a rotating unit. The flip support unit is connected to the seat frame 1-31 in the seat frame 1-31 assembly. The flip support unit includes a flip rib 1. The pulling unit includes a pull strap 2 connected to the flip rib 1. The rotating unit includes a first rotating unit and a second rotating unit. The flip rib 1 is connected to the seat frame 1-31 through the first rotating unit. The flip rib 1 is connected to the steel mesh 72 in the seat cushion frame assembly 1-2 through the second rotating unit. Pulling the pull strap 2 can drive the flip rib 1 to rotate around the first rotating unit. The seat cushion frame assembly 1-2 and the flip rib 1 can rotate relative to each other around the second rotating unit. The flip support unit and the seat frame 1-31 are connected in whole to the seat frame 1-31 of the seat frame 1-31 assembly. The flip support unit contains the flip rib 1 inside. The flip rib 1 is connected to the seat frame 1-31 through the first rotating unit. The flip-up rib 1 can rotate relative to the seat frame 1-31 around the axis of the first rotating unit. The flip-up rib 1 is connected to the steel mesh 72 in the seat cushion frame assembly 1-2 through the second rotating unit. This allows the seat cushion frame assembly 1-2 to rotate relative to the flip-up rib 1 around the axis of the second rotating unit. The pulling unit includes a pull strap 2, which is directly connected to the flip-up rib 1 (usually connected at the position of the middle rib 11). The flip-up support unit (flip-up rib 1) serves as the core force transmission component and rotation hub of the locking structure. One end is supported on the seat frame 1-31 through the first rotating unit, and the other end drives the seat cushion frame through the second rotating unit. Its three-dimensional bending shape (including the middle rib 11, the secondary rib 12, and the tertiary rib 13) corresponds to the connection of the pull strap 2, the second rotating unit, and the first rotating unit, respectively, realizing the force diversion and motion conversion.

[0067] In this invention, the pull strap 2 can be manually operated by the occupant (pulled upwards or forwards). The pulling force is directly transmitted to the flip-up rod 1, triggering the unlocking action. The pull strap 2 itself is flexible, making it easy to place under the seat cushion without taking up extra space.

[0068] The first rotating unit defines the rotation axis of the flipping rib 1, causing the flipping rib 1 to rotate around this axis under tension.

[0069] The second rotating unit allows the seat cushion frame to rotate independently relative to the flipping rib 1, so that during the unlocking process, the seat cushion frame can be lifted and its angle adjusted at the same time to avoid interference with the seat frame 1-31. At the same time, it ensures that there is no relative wobbling between the seat cushion frame and the flipping rib 1 in the locked state (usually in conjunction with the limiting protrusion 53 or the locking spring 5 to maintain the locked position).

[0070] This invention uses a single flipping rib 1 in conjunction with two rotating units to replace the traditional complex lock body, resulting in fewer parts and lighter weight. Simultaneously, it utilizes the self-weight of the seat cushion frame assembly 1-2, along with the limiting structure 8 and the limiting protrusion 53, to achieve self-locking of the seat cushion frame assembly 1-2.

[0071] In this invention, the flipping rib 1 includes a central rib 11; each of the two ends of the central rib 11 is provided with a lateral rib; the lateral ribs include secondary ribs 12 and tertiary ribs 13; one end of the secondary rib 12 is connected to the central rib 11 via a secondary connecting rod 15, and the other end is connected to the tertiary rib 13 via a primary connecting rod 14; the central rib 11, secondary rib 12, and tertiary rib 13 are distributed in parallel at intervals; the central rib 11 is connected to the pull strap 2 in the pulling unit, the secondary rib 12 is connected to the second rotating unit, and the tertiary rib 13 is connected to the first rotating unit; in this invention, the central rib 11 is directly connected to the pull strap 2 in the pulling unit. The central rib 11, secondary rib 12, and tertiary rib 13 are parallel to each other and spatially separated, so that the connection points of the pull strap 2, the first rotating unit, and the second rotating unit do not interfere with each other, and no collision or jamming occurs during rotation.

[0072] When the occupant pulls the strap 2, the pulling force acts directly on the central reinforcing bar 11. Since the central reinforcing bar 11 is located in a symmetrical position in the center of the flipping reinforcing bar 1, it ensures that the force on both sides is balanced and avoids the flipping reinforcing bar 1 from twisting and deforming. After being stretched, the central reinforcing bar 11 drives the entire flipping reinforcing bar 1 to rotate around the first rotating unit (the axis of the third-level reinforcing bar 13).

[0073] The secondary rib 12 is connected to the seat cushion frame via a second rotating unit and the steel mesh 72 of the seat cushion frame. In the locked state, the secondary rib 12 is constrained by the second rotating unit (e.g., by a limiting protrusion 53) to prevent accidental disengagement. When the entire flipping rib 1 rotates, the secondary rib 12 drives the second rotating unit and the seat cushion frame to move together, while simultaneously allowing the seat cushion frame to perform additional rotation relative to the flipping rib 1 (the second axis in the dual-rotation axis system).

[0074] The third-level rib 13 is inserted into the first rotating unit (fixed bracket 3) and serves as the main rotation axis for the rotation of the flipping rib 1 relative to the seat frame 1-31. The axis of the third-level rib 13 is the rotation center line of the first rotating unit. The design of "parallel spacing of the central rib 11 + secondary rib 12 + tertiary rib 13 connected by connecting rods" separates the three functional areas of the pull strap 2 drive point, seat cushion connection point, and frame connection point in space and arranges them in parallel. This makes the flipping rib 1 a compact, rationally stressed, and definite motion integrated component, which is the core geometric basis for realizing the dual-rotation axis locking scheme.

[0075] A seat cushion frame assembly 1-2 includes a frame body 7 and a seat cushion locking structure 1-1. The frame body 7 includes a seat cushion frame body 71, on which a steel mesh 72 is provided. The seat cushion locking structure 1-1 is connected to the steel mesh 72 via a second rotating unit. The second rotating unit includes a locking spring 5 connected to the steel mesh 72. The locking spring 5 has a limiting protrusion 53 near the flip rod 1 for limiting the flip rod 1. The limiting protrusion 53 prevents the flip rod 1 (specifically, the secondary connecting rod 15) from reversing upwards in the locked state, thus providing a locking function. When the occupant pulls the strap 2, the flip rod 1 overcomes the blocking force of the limiting protrusion 53 and unlocks. The locking spring 5 can act as a connecting bridge: fixing the second rotating unit (and the entire locking structure) to the steel mesh 72, so that the movement of the flip rod 1 can be transmitted to the seat cushion frame. Provide a mounting base for the limiting protrusion 53, and utilize its own elasticity or rigidity to provide the resistance / blocking surface required for limiting.

[0076] When the seat is in the normal sitting position (locked position), the anti-flip lever 1 is prevented from rotating upward or in the opposite direction, thus preventing the seat from being accidentally unlocked due to vehicle vibration or accidental contact with the pull strap 2.

[0077] To prevent the flipping rod 1 from disengaging from the locked position when not under tension.

[0078] The locking spring 5 and the limiting protrusion 53 together constitute a mechanical locking and retaining mechanism. It eliminates the need for additional springs or complex lock bodies, relying solely on the geometry and elastic deformation (or rigid blocking) of the metal parts to achieve reliable locking. Compared to traditional lock bodies, it features a minimalist structure, low cost, small footprint, and is less prone to jamming or failure.

[0079] In this invention, the seat cushion locking structure 1-1 is connected to the steel mesh 72 through two second rotating units; the two second rotating units are relatively symmetrically distributed; the two second rotating units are distributed on opposite sides of the flipping rib 1; the symmetrical distribution of the two second rotating units in this invention can prevent the seat cushion frame from twisting or jamming due to unilateral force when locking or rotating; and ensure that the flipping rib 1 rotates synchronously on both sides to avoid skewing.

[0080] In this invention, the locking spring 5 includes a first connecting plate 51 and a second connecting plate 52, which are arranged perpendicularly to each other. The first connecting plate 51 serves as a fixed base, firmly attaching the entire second rotating unit to the steel mesh 72. The vertical design facilitates adaptation to the planar structure of the mesh. The second connecting plate 52 is used to support the limiting protrusion 53.

[0081] In this invention, the first connecting plate 51 is fixedly connected to the steel mesh 72; the second connecting plate 52 of the locking spring 5 is provided with a limiting protrusion 53; the limiting protrusion 53 protrudes towards the flipping rib 1; the locking spring 5 is provided with a fixing plate 4; the fixing plate 4 and the locking spring 5 can be connected in a detachable manner; the detachable connection method can be snap-fit, bolt connection, etc.; the fixing plate 4 and the locking spring 5 can form a rotating inner cavity; the flipping rib 1 is connected in the rotating inner cavity; the limiting protrusion 53 is located on the second connecting plate 52; in the normal sitting state of the seat cushion, it prevents the flipping rib 1 (secondary connecting rod 15) from rotating upward / reverse, preventing accidental unlocking.

[0082] The fixing plate 4 and the locking spring 5 together form a rotating inner cavity, which constrains the secondary rib 12 of the flipping rib 1 within the cavity, allowing it to rotate but not disengage. The fixing plate 4 and the locking spring 5 are detachable: this design facilitates assembly, maintenance, or replacement (e.g., when the locking spring 5 or the flipping rib 1 is worn).

[0083] The fixing plate 4 and the locking spring 5 together form a rotating inner cavity, which serves to accommodate and guide the rotation: providing a cylindrical or arc-shaped space concentric with the rotation axis for the secondary stiffener 12 of the flipping stiffener 1, ensuring smooth rotation without excessive clearance. During vehicle vibration or seat cushion flipping, the secondary stiffener 12 is always confined within the inner cavity and will not detach from the second rotating unit.

[0084] Furthermore, in this invention, the reinforcing mesh 72 comprises multiple individual reinforcing bars 701; adjacent individual reinforcing bars 701 are arranged intersectingly or parallelly; each individual reinforcing bar 701 includes a reinforcing bar body 721, and the two ends of the reinforcing bar body 721 are provided with connecting hooks 722; each connecting hook 722 is connected to the reinforcing bar body 721 through a transition link 723, and the reinforcing bar body 721 and the connecting hook 722 are staggered; the transition link 723 has an arc-shaped structure. The reinforcing mesh 72 (composed of multiple individual reinforcing bars 701) serves as the main load-bearing structure of the seat cushion frame assembly 1-2, supporting the seat cushion foam and occupant load. It can also be welded and fixed to the second rotating unit (locking spring 5) through the individual reinforcing bars 701 to transmit locking force. The intersecting or parallel individual reinforcing bars 701 form a high-density mesh, improving overall rigidity and preventing seat cushion deformation.

[0085] Intersecting arrangement (e.g., transverse and longitudinal reinforcement perpendicularly intersecting): forms a stable planar grid with good bending and torsional resistance. In specific designs, the reinforcement density can be increased in areas requiring reinforcement, or used for connections in edge areas.

[0086] In this invention, the reinforcing bar body 721 bears the vertical load from the seat cushion surface and transfers it to the connecting hooks 722 at both ends and the grid intersections. The connecting hooks 722 are used to hook the individual reinforcing bars 701 onto the edges or specific mounting points of the seat cushion frame body 71, facilitating pre-positioning during assembly. The hook structure provides a clear welding contact surface, improving welding quality. During the use of the seat cushion assembly, the hooks and the frame body 7 form a hook constraint, preventing the reinforcing bars from shifting. The transition link 723 (arc-shaped structure) spatially misaligns the reinforcing bar body 721 with the connecting hooks 722, allowing the hooks to reach different planar positions of the frame body 7 (e.g., bending from the grid plane to the edge hook point). Compared to right-angle bends, the arc shape has a smaller stress concentration factor and a longer fatigue life under repeated loads. In a forward collision, the arc-shaped transition link 723 undergoes elastic deformation upon impact, and its arc shape can "hook" or "block" the downward tendency, effectively preventing the occupant's buttocks from sliding forward and downward (i.e., anti-submersion function).

[0087] Furthermore, the seat cushion frame assembly 1-2 in this invention also includes an anti-submarine mechanism, a support unit, and / or a limiting structure 8; the anti-submarine mechanism includes an anti-submarine frame 10 and an anti-noise pad 101; the anti-submarine frame 10 is mounted on the frame body 7, and the anti-submarine frame 10 is inverted L-shaped; the anti-submarine frame 10 (inverted L-shaped); during a forward collision, the inertial force of the occupant and the seat cushion causes the seat cushion frame to move forward and downward. The vertical part of the inverted L-shaped anti-submarine frame 10 hooks or abuts against the seat frame 1-31 below (such as the inner side or transverse structure of the square tube upper frame 1-311), directly preventing the seat cushion frame from continuing to move forward and preventing the occupant from "submarinating" under the seat belt; the inverted L shape itself has high bending stiffness and can withstand the impact load during a collision without deformation. It is usually located on the inner front part of the seat cushion frame, symmetrically placed on both sides to balance the force. During normal driving, there may be slight gaps or relative vibrations between the anti-submarine frame 10 and the seat frame 1-31. The noise-absorbing pad 101 (such as polyurethane material with adhesive backing) is attached to the contact surface to cushion the contact and prevent direct metal-to-metal friction that could generate noise. It also prevents wear between the anti-submarine frame 10 and the seat frame 1-31 under long-term vibration.

[0088] In this invention, the limiting structure 8 includes a guide limiting steel bar 81 disposed on the frame body 7; the guide limiting steel bar 81 is provided with an anti-noise felt 82; and the limiting structure 8 mainly serves as a locking and limiting mechanism. When the seat cushion frame returns to its original position from the flipped-up state, the guide limiting steel bar 81 first contacts the limiting sheet metal 83 (such as an insert groove) on the seat frame 1-31, guiding the seat cushion frame accurately into the final locking position. After the seat cushion is fully reset, the guide limiting steel bar 81 and the limiting sheet metal 83 form an insert fit, restricting the movement of the seat cushion frame in the front-back and up-down directions, and together with the support pad 6, maintaining the stable position of the seat cushion. Both the guide limiting steel bar 81 and the limiting sheet metal 83 are metal parts, and direct contact will generate friction noise when the vehicle vibrates. The anti-noise felt 82 isolates the direct metal contact, completely eliminating the noise. The anti-noise felt 82 has a certain degree of compressibility, which can adapt to the manufacturing error of the parts and ensure the tightness of the insert fit.

[0089] In this invention, the seat cushion frame assembly 1-2 further includes a support unit; the support unit includes a support pad 6, which is detachably connected to the seat cushion frame body 71. The support pad 6 is located at the four corners of the bottom of the seat cushion frame or at key stress points, forming surface contact with the upper surface of the seat frame 1-31, bearing the vertical load of the seat cushion and the occupant above it, preventing the seat cushion frame from directly pressing against the seat frame 1-31 and generating impact noise; the support pad 6 is typically made of elastic material (such as rubber or polyurethane) to absorb high-frequency vibrations from the road surface, improving riding comfort; the detachable connection (such as screws) facilitates the replacement of pads of different thicknesses according to different vehicle models or wear conditions, or for maintenance. The support unit cooperates with the limiting structure 8 to constrain the seat cushion frame vertically, making the locking mechanism more reasonably stressed and preventing the locking structure from bearing excessive vertical load.

[0090] Furthermore, in this invention, the seat cushion frame assembly 1-2 respectively includes two anti-submarine mechanisms and a limiting structure 8; the two limiting structures 8 are distributed at relative intervals; the flipping rib 1 is connected to the seat frame 1-31 through two first rotating units, and the flipping rib 1 is connected to the steel mesh 72 through two second rotating units; the two first rotating units and the second rotating units are symmetrically distributed at intervals; the two anti-submarine mechanisms are symmetrically arranged left and right to ensure that both sides of the seat cushion frame are blocked simultaneously during a collision, preventing unilateral sinking or twisting. This avoids the collision load being concentrated on one side and improves the overall anti-submarine reliability.

[0091] The symmetrically arranged limiting structures 8 (guide limiting steel bars 81) interlock with the limiting sheet metal 83 on the seat frame 1-31, ensuring that the seat cushion frame remains in the same position after each reset. Symmetrically distributed from both sides, they constrain the rear end of the seat cushion frame to prevent lateral swaying.

[0092] The rotating rib is connected to the seat frame 1-31 through two first rotating units on the left and right, so that the vertical load and the flipping torque are evenly distributed to both sides of the seat frame 1-31, avoiding unilateral overload. This ensures that the rotating rib 1 rotates synchronously around the two coaxial first rotating units without twisting.

[0093] Two second rotating units (symmetrically distributed) are symmetrically connected to the steel mesh 72, enabling the seat cushion frame to move synchronously left and right during locking and unlocking, preventing jamming. In the locked state, the load of the seat cushion frame is symmetrically transferred to the flipping rib 1 through the two second rotating units.

[0094] In this invention, a limiting structure 8 is provided on the extension line of the line connecting the center point of the first rotating unit and the center point of the second rotating unit on the same side as the flipping rib 1; the three are arranged collinearly, which can ensure that when the flipping rib 1 is locked, the resultant force of the flipping rib 1 is downward, and the seat frame assembly will not flip on its own without the action of additional external force.

[0095] A seat includes a seat frame assembly, which includes a seat frame 1-31; a seat cushion frame assembly 1-2 is disposed on the seat frame 1-31; the seat frame 1-31 includes a square tube upper frame 1-311; a support pad 6 in the seat cushion frame assembly 1-2 is in contact with the surface of the square tube upper frame 1-311; the seat frame assembly is the main support frame structure of the seat, and the seat frame 1-31 is the lower support structure of the seat frame assembly. The seat cushion frame assembly 1-2 is arranged above the seat frame 1-31, and a rectangular square tube upper frame 1-311 is welded to the seat frame 1-31. The support pad 6 in the seat cushion frame assembly 1-2 is in contact with the surface of the square tube upper frame 1-311. This arrangement can ensure the longitudinal stability support of the seat frame 1-31 for the seat cushion frame assembly 1-2.

[0096] In this invention, the two second rotating units in the seat cushion frame assembly 1-2 are respectively connected to two individual steel bars 701 in the mesh reinforcement; a flip-stabilizing steel bar 9 is provided between the two individual steel bars 701 connecting the second rotating units; the flip-stabilizing steel bar 9 and the middle steel bar 11 in the flip-stiffening rod 1 are distributed parallel to each other at intervals; when the seat cushion frame assembly 1-2 is stably arranged on the seat frame 1-31, the height of the central axis of the flip-stabilizing steel bar 9 from the horizontal plane is greater than the height of the middle steel bar 11 from the horizontal plane; the pull strap 2 is arranged on the side of the flip-stabilizing steel bar 9 away from the seat frame 1-31. The two individual steel bars 701 (connecting the second rotating units) provide a stable mounting point for the second rotating units, enabling the flip-stiffening rod 1 to achieve a rotating connection with the steel mesh 72 (i.e., the seat cushion frame) through the second rotating units. The symmetrical arrangement of the two individual steel bars 701 ensures that the second rotating units are symmetrically distributed from left to right, so that the seat cushion frame is subjected to balanced forces.

[0097] The flip-stabilizing reinforcing bar 9 provides a fixed, higher-positioned bypass point for the pull strap 2. Since the pull strap 2 passes through the flip-stabilizing reinforcing bar 9 before connecting to the central reinforcing bar 11, the tension that might have been directly backward or downward is transformed, guided by the flip-stabilizing reinforcing bar 9, into an upward-diagonal force applied to the central reinforcing bar 11. This upward-diagonal force helps the flip-reinforcing bar 1 rotate around the first rotating unit (located in the third-level reinforcing bar 13), preventing the tension from directly pointing towards the rotation axis and creating a "dead point" or excessive frictional resistance, making the unlocking action easier and the stroke shorter.

[0098] The flipping stabilizing rebar 9 is higher than the central reinforcing bar 11; this is the core geometric condition for achieving the change in the direction of the tensile force. If the two are at the same height or the flipping stabilizing rebar 9 is lower, the pull strap 2 cannot generate an upward tensile force component, and may even generate a downward component force, which would increase the unlocking resistance. This height difference also ensures that the pull strap 2 remains in contact with the flipping stabilizing rebar 9 during the unlocking process, playing a stabilizing and guiding role.

[0099] Furthermore, in this invention, the first rotating unit includes a fixed bracket 3, which is connected to the seat frame 1-31, and the fixed bracket 3 and the seat frame 1-31 can form a first rotating inner hole; the third-level rib 13 in the flipping rib 1 is inserted into the corresponding first rotating inner hole; the first rotating unit realizes the rotatable connection between the flipping rib 1 and the seat frame 1-31.

[0100] Fixed bracket 3: An independent sheet metal or casting component. Fixed bracket 3 is fixedly connected to seat frame 1-31 (e.g., by welding or bolting). Fixed bracket 3 and the surface of the tubular components (or other structures) of seat frame 1-31 together form a first rotating inner hole—that is, fixed bracket 3 itself has an arc-shaped or semi-circular groove, which, after being fastened to the tubular components of seat frame 1-31, forms a closed or semi-closed cylindrical space. The third-level rib 13 of the flip rib 1 is inserted into this first rotating inner hole.

[0101] The fixed bracket 3 and the seat frame 1-31 can form a rotating pair: the three-stage rib 13 can rotate freely in the first rotating inner hole, thereby allowing the entire rotating rib 1 to rotate relative to the seat frame 1-31 about the axis of the hole.

[0102] In this invention, the limiting structure 8 in the seat frame assembly further includes a limiting sheet metal 83 disposed on the seat frame 1-31. The limiting sheet metal 83 includes a stepped lap plate; the stepped lap plate is provided with a connecting bracket 834; an insertion groove is formed between the connecting bracket 834 and the stepped lap plate; the guide limiting steel bar 81 in the limiting structure 8 can be inserted into the insertion groove; the stepped lap plate includes a first-level lap plate 831, a second-level lap plate 832, and a third-level lap plate 833; the second-level lap plate 832 has a first-level lap plate 831 and a third-level lap plate 833 at each end; the second-level lap plate 832... Plate 832 intersects with the first-level overlapping plate 831 and the third-level overlapping plate 833; the stepped overlapping plate can overlap the seat frame 1-31 through the first-level overlapping plate 831; the second-level overlapping plate 832 and the first-level overlapping plate 831 are arranged on the two sides of the square tube upper frame 1-311 of the seat frame 1-31; one end of the connecting bracket 834 is connected to the third-level overlapping plate 833, and the other end extends freely; the connecting bracket 834 is also a stepped plate structure; the limiting sheet metal 83 in the limiting structure 8 is set on the seat frame 1-31 and cooperates with the guide limiting steel bar 81 at the rear end of the seat cushion frame to achieve final limiting. The limiting sheet metal 83 itself is composed of a stepped overlapping plate and a connecting bracket 834, and the stepped overlapping plate includes a first-level overlapping plate 831, a second-level overlapping plate 832, and a third-level overlapping plate 833. The limiting sheet metal 83 is an important component of the limiting structure 8, working in conjunction with the guide limiting steel bars 81 on the seat cushion frame. The primary lap plate 831, secondary lap plate 832, and tertiary lap plate 833 are connected sequentially. Specifically, the two ends of the secondary lap plate 832 are connected to the primary lap plate 831 and the tertiary lap plate 833, respectively. The secondary lap plate 832, primary lap plate 831, and tertiary lap plate 833 are intersecting (usually perpendicular to each other, forming a stepped shape). The overall shape resembles a multi-stage bent sheet metal part in a Z or C shape.

[0103] The primary overlapping plate 831 overlaps the upper surface of the seat frame 1-31 (specifically, the square tube upper frame 1-311) and is fixed by welding or bolts. The secondary overlapping plate 832 is arranged on the side of the square tube upper frame 1-311 (adjacent to the upper surface of the primary plate). Therefore, the primary overlapping plate 831 and the secondary overlapping plate 832 are respectively attached to two adjacent sides of the square tube upper frame 1-311, forming a wrap-around positioning, which improves the installation stability of the limiting sheet metal 83 itself.

[0104] One end of the connecting bracket 834 is connected to the three-stage overlapping plate 833 (which can be welded, integrally bent, or riveted). The other end of the connecting bracket 834 extends freely (not fixed to other components). The connecting bracket 834 itself is also a stepped plate structure (e.g., inverted L-shape or multi-stage bending). A recessed groove is formed between the connecting bracket 834 and the body of the stepped overlapping plate—that is, a recessed space with an opening and a bottom. The guide limiting steel bar 81 at the rear end of the seat frame can be accurately inserted into the recessed groove. When the seat frame is reset downwards, the guide limiting steel bar 81 is inserted into the recessed groove; in the locked state, the steel bar is constrained in the recessed groove and cannot come out upwards.

[0105] Primary overlapping plate 831: Serves as the fixing base for the entire limiting sheet metal 83, firmly attaching the limiting sheet metal 83 to the upper surface of the seat frame 1-31. Secondary overlapping plate 832: Perpendicular to the primary plate, it fits against the side of the square tube upper frame 1-311, preventing the limiting sheet metal 83 from rotating or loosening around the fixing point of the primary plate, and enhancing torsional rigidity.

[0106] The three-stage overlapping plate 833 provides a connection base for the connecting bracket 834. At the same time, when the seat frame is locked, it provides longitudinal support to the rear end of the seat frame (preventing the seat frame from sinking excessively or tilting forward).

[0107] The connecting bracket 834 and the stepped lap plate together form a groove with a guide surface and a limiting bottom. When the seat frame is pressed back down from the flipped-up state, the guide limiting steel bar 81 first contacts the free end inclined surface or opening of the connecting bracket 834 and is guided into the depth of the groove. After the guide limiting steel bar 81 is fully inserted into the insertion groove, the side walls and bottom of the insertion groove restrict the upward displacement of the steel bar, thereby achieving precise positioning of the seat frame in the vertical direction.

[0108] The inverted L-shaped or stepped plate shape of the connecting bracket 834 causes the guide limiting steel bar 81 to form a "barb"-like constraint after insertion, so that the steel bar will not slide out of the sinkhole on its own even if the vehicle vibrates or the occupants shake.

[0109] Example 1:

[0110] This invention provides a seat cushion locking structure 1-1, a seat cushion frame assembly 1-2 with the locking structure, and a seat. The core of this technical solution lies in the use of an integrated steel wire flip-locking system, which completely replaces the traditional bulky and multi-part independent seat cushion lock body. At the same time, through the synergistic effect of multiple steel wire structures, it achieves stable locking, smooth unlocking, precise limiting, collision anti-submarine, and excellent NVH performance of the seat cushion.

[0111] In this invention, the seat cushion locking structure 1-1 mainly includes a flip support unit, a pulling unit, and a rotating unit. The flip support unit is integrally connected to the seat frame 1-31 of the seat frame assembly, and its core component is the flip rib 1. The core of the pulling unit is a pull strap 2, which is directly connected to the flip rib 1. The rotating unit is further divided into a first rotating unit and a second rotating unit.

[0112] The flipping rib 1 is designed as a rod with a specific three-dimensional shape, and its specific structure is as follows: It mainly includes a central rib 11 located in the middle position, and a lateral rib is symmetrically arranged at both ends of the central rib 11. Each lateral rib is not a single rod, but includes a secondary rib 12 and a tertiary rib 13; one end of the secondary rib 12 is fixedly connected to the end of the central rib 11 through a secondary connecting rod 15, and the other end of the secondary rib 12 is fixedly connected to the tertiary rib 13 through a primary connecting rod 14. From the above design, it can be seen that the lateral rib is a multi-segment rod structure. The purpose of this design is mainly to facilitate the connection between multiple positions and the rotating unit.

[0113] In this invention, the central rib 11, the secondary rib 12, and the tertiary rib 13 are spatially distributed in a spaced-apart and parallel manner. The central rib 11 is directly connected to the pull strap 2 of the pulling unit, the secondary rib 12 is connected to the second rotating unit, and the tertiary rib 13 is connected to the first rotating unit.

[0114] In terms of assembly, the flip-up rib 1 is rotatably connected to the seat frame 1-31 via a first rotating unit. Simultaneously, the flip-up rib 1 is rotatably connected to the steel mesh 72 in the seat cushion frame assembly 1-2 via a second rotating unit. During operation, the occupant pulls the strap 2, which causes the flip-up rib 1 to rotate around the axis of the first rotating unit. At the same time, because the flip-up rib 1 is connected to the seat cushion frame via the second rotating unit, the seat cushion frame itself can also rotate relative to the flip-up rib 1 around the axis of the second rotating unit. This dual-rotation-axis design makes the unlocking action easy, with a short stroke and a clear movement trajectory.

[0115] The seat cushion frame assembly 1-2 mainly includes the frame body 7 and the aforementioned seat cushion locking structure 1-1. The frame body 7 has a seat cushion frame body 71, on which a steel mesh 72 is arranged. The aforementioned seat cushion locking structure 1-1 is connected to the steel mesh 72 through a second rotating unit.

[0116] The second rotating unit mainly includes a locking spring 5, which is fixedly connected to the steel mesh 72. Specifically, the corresponding individual steel bars 701 in the steel mesh 72 are arranged on the corresponding locking spring 5, and the two are connected by welding. On the side of the locking spring 5 near the flipping rod 1, a limiting protrusion 53 is provided. The limiting protrusion 53 is used to limit the initial position of the flipping rod 1 and prevent it from accidentally disengaging without external force.

[0117] In this invention, to improve the stability and uniformity of locking, the seat cushion locking structure 1-1 typically employs two second rotating units connected to the reinforcing mesh 72. These two second rotating units are symmetrically distributed, located on opposite sides (i.e., left and right sides) of the flip-up rib 1. Each locking spring 5 is specifically constructed as follows: it includes a first connecting plate 51 and a second connecting plate 52, which are perpendicular to each other. The first connecting plate 51 is used for fixed connection (e.g., by welding) to the surface of the reinforcing mesh 72. The second connecting plate 52 extends upwards or laterally perpendicular to the first connecting plate 51, and the aforementioned limiting protrusion 53 is disposed on this second connecting plate 52, protruding towards the flip-up rib 1.

[0118] In addition, each second rotating unit also includes a fixing plate 4. The fixing plate 4 and the locking spring 5 are fixed to each other by a detachable connection method (e.g., by bolts and / or snap-fit ​​connections). After the fixing plate 4 is installed on the locking spring 5, because the fixing plate 4 has an arc-shaped plate area, the fixing plate 4 and the locking spring 5 together form a rotating inner cavity in this arc-shaped plate area. The flipping rib 1 (specifically its secondary rib 12 part) is connected in this rotating inner cavity. This arrangement can realize the rotating connection between the frame body 7 and the seat cushion locking structure 1-1. In this invention, the fixing plate 4 and the locking spring 5 adopt a detachable connection method, which facilitates disassembly between the two during subsequent use and maintenance.

[0119] The reinforcing mesh 72 itself comprises multiple individual reinforcing bars 701. Adjacent individual reinforcing bars 701 can be arranged intersectingly or parallelly, forming a high-density mesh. Individual reinforcing bars 701 are generally referred to as transverse reinforcing bars and longitudinal reinforcing bars due to their different distribution directions; multiple transverse and longitudinal reinforcing bars are distributed perpendicularly to each other to form a mesh structure. The structural characteristics of each individual reinforcing bar 701 are: it includes a straight-extending reinforcing bar body 721, with a connecting hook 722 at each end of the reinforcing bar body 721. Each connecting hook 722 is not on the same plane as the reinforcing bar body 721, but is connected to the reinforcing bar body 721 through a transition link 723, causing the reinforcing bar body 721 and the connecting hook 722 to be spatially staggered. More importantly, the transition link 723 is designed as an arc-shaped structure. This arc-shaped transition link 723 not only facilitates the lap welding between different steel reinforcement layers, but its arc shape itself can also generate a certain degree of elastic deformation and blocking effect when subjected to impact, providing excellent anti-submarine slippage effect. It also improves the overall toughness and fatigue life of the mesh. The rod design of the connecting hook 722 also facilitates the hanging and positioning of the individual steel reinforcement 701 on the seat cushion frame body 71. In this invention, the seat cushion frame assembly 1-2 also includes an anti-submarine slippage mechanism, a support unit, and a limiting structure 8.

[0120] The anti-submarine mechanism includes an anti-submarine frame 10 and noise-absorbing pads 101. The anti-submarine frame 10 is fixedly mounted on the frame body 7, specifically located on the inner side of the front part of the seat cushion frame, with one symmetrically positioned on each of the left and right sides. The anti-submarine frame 10 is manufactured in an inverted L-shape, with its horizontal portion welded to the frame body 7 and its vertical portion extending downwards into the inner side of the seat frame 1-31. The noise-absorbing pads 101 are mounted on the inner wall of the seat frame 1-31. In the event of a collision, the inverted L-shaped anti-submarine frame 10 can directly hook or abut against the lower seat frame 1-31, effectively preventing the seat cushion frame from tilting forward and submerging due to inertia, providing passive safety protection for the occupants. The noise-absorbing pads 101 are made of polyurethane material with adhesive backing and are adhered to the contact surface between the anti-submarine frame 10 and the lower seat frame 1-31 to eliminate frictional noise that may be generated due to gaps or vibrations during normal use.

[0121] The limiting structure 8 mainly includes a guide limiting steel bar 81 and an anti-noise felt 82. The guide limiting steel bar 81 is located at the rear end of the seat cushion frame body 71 and is fixedly connected to the seat cushion frame body 71 by welding. The anti-noise felt 82 is pasted on the outer surface of the guide limiting steel bar 81. When the seat cushion is folded back to its original position, the guide limiting steel bar 81 will form an interlocking engagement with the limiting sheet metal 83 structure on the seat frame 1-31, playing a role in precise guidance and final limiting. The pasted anti-noise felt 82 isolates the steel bar from direct metal contact with the sheet metal, completely eliminating the possibility of friction noise caused by vehicle vibration.

[0122] The support unit mainly includes support pads 6. These support pads 6 are detachably connected to the seat cushion frame body 71 (e.g., via screws). The support pads 6 are typically located at the four corners or key stress points at the bottom of the seat cushion frame, forming surface contact with the upper surface of the seat frame 1-31 to provide vertical support and damping. The detachable design allows for easy replacement or adjustment based on different vehicle heights or wear conditions.

[0123] At the same time, the support pad 6 forms a surface contact with the upper surface of the seat frame 1-31, ensuring the stability of the contact area between the two, and also playing a good role in assisting restraint and limiting; it can work with the limiting structure 8 to better ensure the stability of the seat cushion frame assembly 1-2 on the seat frame 1-31.

[0124] In this invention, the seat frame assembly 1-2 preferably includes two anti-submersion mechanisms and two limiting structures 8, both of which are symmetrically distributed and spaced apart. The flip-up rib 1 is connected to the seat frame 1-31 via two first rotating units and to the steel mesh 72 via two second rotating units, both of which are symmetrically distributed at intervals. An important geometric coordination is that on the same side of the flip-up rib 1, on the extension line connecting the center point of the first rotating unit and the center point of the second rotating unit, a limiting structure 8 (i.e., the aforementioned guide limiting steel bar 81) is precisely positioned. This arrangement allows the force under locked conditions to be transmitted to the limiting point along the most direct force transmission path, avoiding eccentric loading and improving the structural stability during long-term use.

[0125] The present invention also provides a seat comprising the aforementioned seat cushion frame assembly 1-2. The seat includes a seat frame assembly, which includes a seat frame 1-31. The aforementioned seat cushion frame assembly 1-2 is mounted on the seat frame 1-31. Specifically, the seat frame 1-31 includes a square tube upper frame 1-311, and the support pad 6 in the seat cushion frame assembly 1-2 forms a stable surface contact with the upper surface of the square tube upper frame 1-311, providing vertical support.

[0126] In a further optimized design, the two second rotating units in the seat cushion frame assembly 1-2 are not arbitrarily connected to the steel mesh 72, but are respectively connected to two specific individual steel bars 701 within the mesh. Furthermore, an additional tilting stabilizing steel bar 9 is provided between these two individual steel bars 701 connected to the second rotating units. This tilting stabilizing steel bar 9 is distributed parallel to the central reinforcing bar 11 of the tilting reinforcing bar 1 at intervals. When the seat cushion frame assembly 1-2 is stably positioned on the seat frame 1-31 (i.e., in the normal seat locking state), the height of the central axis of the tilting stabilizing steel bar 9 from the horizontal plane is greater than the height of the central reinforcing bar 11 from the horizontal plane. In other words, the tilting stabilizing steel bar 9 is positioned higher than the central reinforcing bar 11. Simultaneously, the pull strap 2 is positioned on the side of the tilting stabilizing steel bar 9 away from the seat frame 1-31 (i.e., above it). This height difference setting has an important synergistic effect: when the occupant pulls the strap 2 upwards, because the strap 2 bypasses the higher-positioned flipping stabilizing steel bar 9 before connecting to the central reinforcing bar 11, the direction of the pulling force is forced to deflect, forming an upward-sloping rather than horizontal pulling force component. This upward-sloping pulling force helps the flipping reinforcing bar 1 rotate smoothly around the first rotating unit, avoiding the situation where the pulling force direction is directly pointing towards the axis of the first rotating unit, thus preventing the creation of a "dead point" or increased resistance.

[0127] The first rotating unit mainly includes a fixed bracket 3. The fixed bracket 3 is fixedly connected to the seat frame 1-31 (e.g., by welding or bolting). The fixed bracket 3 and the tubular surface of the seat frame 1-31 together form a closed or semi-closed first rotating inner hole. The third-level rib 13 in the flip rib 1 is inserted into this first rotating inner hole to achieve a rotating connection.

[0128] The limiting structure 8 includes a limiting sheet metal 83 disposed on the seat frame 1-31, and the limiting sheet metal 83 includes a stepped overlapping plate. A connecting bracket 834 is provided on the stepped overlapping plate, and an insertion groove is formed between the connecting bracket 834 and the body of the stepped overlapping plate. The guide limiting steel bar 81 in the aforementioned limiting structure 8 can be accurately inserted into the insertion groove to achieve limiting. The stepped overlapping plate itself further includes a primary overlapping plate 831, a secondary overlapping plate 832, and a tertiary overlapping plate 833. The two ends of the secondary overlapping plate 832 are respectively connected to the primary overlapping plate 831 and the tertiary overlapping plate 833, and the secondary overlapping plate 832 is intersecting with the primary overlapping plate 831 and the tertiary overlapping plate 833 (e.g., perpendicular to each other). During installation, the stepped overlapping plate overlaps and is fixed to the upper surface of the seat frame 1-31 through its primary overlapping plate 831. The secondary overlapping plate 832 is arranged on the side of the square tube upper frame 1-311. This design allows the secondary overlapping plate 832 and the primary overlapping plate 831 to be arranged on two adjacent sides of the square tube upper frame 1-311 of the seat frame 1-31, forming a wrapping positioning. One end of the connecting bracket 834 is connected to the tertiary overlapping plate 833, while the other end extends freely. The connecting bracket 834 is also designed as a stepped plate structure. This multi-step stepped limiting sheet metal design 83 not only provides precise insertion guidance but also adapts to manufacturing tolerances. In this invention, the tertiary overlapping plate 833 in the stepped overlapping plate also plays a good longitudinal support role, realizing longitudinal support and limiting of the seat cushion frame assembly 1-2. The connecting bracket 834 of this invention has an overall inverted L-shaped structure, which is equivalent to hanging on the seat cushion frame assembly 1-2 during installation, thereby realizing the locking and limiting of the seat cushion frame assembly 1-2.

[0129] Locked State (Normal Riding): The seat cushion frame assembly 1-2 is folded down into place. At this time, the third-level rib 13 of the flipping rib 1 is in a stable rotation limit position in the first rotating inner hole of the fixed bracket 3. At the same time, the guide limiting steel bar 81 at the rear end of the seat cushion frame is inserted into the insertion groove of the upper limit sheet metal 83 of the seat frame 1-31, and precise limiting is achieved by relying on the stepped overlapping plate. The anti-noise felt 82 eliminates gaps and friction. The second-level rib 12 of the flipping rib 1 is located in the rotating inner cavity formed by the locking spring 5 and the fixed pressure plate 4. The second-level connecting rod 15 in the flipping rib 1 is blocked by the upper limit protrusion 53 of the locking spring 5 to prevent upward reversal. Combined with the weight of the seat cushion frame assembly 1-2, multiple forces are downward, thereby ensuring the stable placement of the seat cushion frame assembly 1-2 on the seat frame 1-31. In the locked state, the weight of the entire seat cushion is transferred to the square tube upper frame 1-311 through the support pad 6.

[0130] Unlocking Process (Front-Flipping Seat Cushion): The occupant pulls the strap 2. Because the strap 2 is guided by the higher-positioned flipping stabilizing steel bar 9, the pulling force is angled upwards. This force acts directly on the middle rib 11 of the flipping rib 1. The flipping rib 1 first overcomes the resistance of the upper limit protrusion 53 of the locking spring 5. After the flipping rib 1 passes the limit protrusion 53, the self-locking of the seat cushion locking structure 1-1 is basically released. The seat cushion locking structure 1-1 can rotate around the first rotating unit, and the frame body 7 can rotate around the second rotating unit. As the flipping rib 1 rotates, its geometric relationship with the seat cushion frame assembly 1-2 changes, and the seat cushion frame assembly 1-2 is gradually lifted. Continuing to pull the strap 2, the seat cushion frame can be flipped forward as a whole.

[0131] Locking Reset (Resumption of Seating): The occupant is required to control the seat cushion frame assembly 1-2, ensuring that the guide limiting steel bar 81 in its limiting structure 8 first inserts into the corresponding insertion groove of the limiting sheet metal 83; then, the flipped-up seat cushion is pressed down. As the pressure continues, the flipping rib 1 passes the limiting protrusion 53, finally emitting a clear "click" sound, indicating that the locking is in place; the final limiting is achieved. The support pad 6 re-contacts the surface of the square tube upper frame 1-311, completing a reliable locking reset.

[0132] Collision scenario: When a vehicle is involved in a forward collision, the enormous inertial force of the occupants and seat cushion foam will cause the seat cushion frame assembly 1-2 to move forward and flip downward. At this time, the inverted L-shaped anti-submarine frame 10 integrated on the inner front part of the seat cushion frame will quickly contact and hook with the seat support frame below, directly preventing the seat cushion frame from continuing to move forward, effectively preventing the occupants from "submarinating" and greatly improving passive safety.

[0133] In summary, this invention, through the organic synergy between multiple steel wire or sheet metal components such as the carefully designed flipping rib 1, locking spring 5, guide limiting steel bar 81, anti-submersion frame 10, and steel mesh 72 with arc-shaped transition connecting rod 723, solves multiple technical problems of traditional seat cushion locking mechanisms, such as large space occupation, high cost, poor vibration filtering, insufficient safety, and abnormal noise, with a highly integrated and compact solution, achieving significant comprehensive benefits.

[0134] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A seat cushion locking structure for a chair, characterized in that, It includes a flipping support unit, a pulling unit, and a rotating unit; The flip support unit is connected to the seat frame in the seat frame assembly; The flip support unit includes a flip rib; The pulling unit includes a pull strap connected to the flipping rib; The rotating unit includes a first rotating unit and a second rotating unit; The flip-up rib is connected to the seat frame via the first rotating unit; The flip-up rib is connected to the steel mesh in the seat cushion frame assembly via the second rotating unit; the flip-up rib can be rotated around the first rotating unit by pulling the strap; the seat cushion frame assembly and the flip-up rib can rotate relative to each other around the second rotating unit.

2. The seat cushion locking structure according to claim 1, characterized in that, The flipping rib includes a central rib; each of the two ends of the central rib is provided with a lateral rib. The lateral stiffeners include secondary stiffeners and tertiary stiffeners; one end of the secondary stiffener is connected to the central stiffener via a secondary connecting rod, and the other end is connected to the tertiary stiffener via a primary connecting rod. The central stiffeners, secondary stiffeners, and tertiary stiffeners are distributed in parallel at intervals. The central reinforcing bar is connected to the pull strap in the pulling unit; the secondary reinforcing bar is connected to the second rotating unit; and the tertiary reinforcing bar is connected to the first rotating unit.

3. A seat cushion frame assembly, characterized in that, The system includes a frame body and a seat cushion locking structure as described in any one of claims 1-2; the frame body includes a seat cushion frame body, on which a steel mesh is provided; the seat cushion locking structure is connected to the steel mesh via a second rotating unit; The second rotating unit includes a locking spring connected to the steel mesh; the locking spring has a limiting protrusion on the side near the flipping rib for limiting the flipping rib.

4. A seat cushion frame assembly according to claim 3, characterized in that, The seat cushion locking structure is connected to the steel mesh through two second rotating units; the two second rotating units are relatively symmetrically distributed; the two second rotating units are distributed on opposite sides of the flip-up rib. The locking spring includes a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate being arranged perpendicularly; the first connecting plate is fixedly connected to the steel mesh. The second connecting plate of the locking spring is provided with a limiting protrusion; the limiting protrusion protrudes towards the flipping rib; The locking spring is provided with a fixing plate; the fixing plate and the locking spring can be connected in a detachable manner. The fixed pressure plate and the locking spring plate can form a rotating inner cavity; the flipping rib is connected in the rotating inner cavity.

5. A seat cushion frame assembly according to claim 3, characterized in that, The steel reinforcement mesh includes multiple individual steel bars; adjacent individual steel bars are arranged intersecting or parallel; each individual steel bar includes a steel bar body, and the steel bar body is provided with connecting hooks at both ends; each connecting hook is connected to the steel bar body through a transition link, and the steel bar body and the connecting hook are staggered; the transition link is an arc-shaped structure.

6. A seat cushion frame assembly according to claim 3, characterized in that, The seat cushion frame assembly also includes an anti-submersion mechanism, a support unit, and / or a limiting structure; the anti-submersion mechanism includes an anti-submersion frame and an anti-noise pad; the anti-submersion frame is mounted on the frame body and is in the shape of an inverted L. The limiting structure includes guide limiting steel bars set on the main frame; the guide limiting steel bars are provided with noise-absorbing felt; The seat cushion frame assembly also includes a support unit; the support unit includes a support pad, which is connected to the seat cushion frame body in a detachable manner.

7. A seat cushion frame assembly according to claim 6, characterized in that, The seat cushion frame assembly includes two anti-submarine mechanisms and a limiting structure; the two limiting structures are distributed at relative intervals; the flip-up rib is connected to the seat frame through two first rotating units, and the flip-up rib is connected to the steel mesh through two second rotating units; the two first rotating units and the second rotating units are symmetrically distributed at intervals. A limiting structure is provided on the extension line of the line connecting the center point of the first rotating unit and the center point of the second rotating unit on the same side as the flipping rib.

8. A type of seat, characterized in that, The system includes a seat frame assembly, which includes a seat frame; the seat frame is provided with a seat cushion frame assembly as described in any one of claims 3-7; the seat frame includes a square tube upper frame; and the support pad in the seat cushion frame assembly is in contact with the surface of the square tube upper frame.

9. A seat according to claim 8, characterized in that, The two second rotating units in the seat cushion frame assembly are respectively connected to two individual steel bars in the grid reinforcement; a flip-stabilizing steel bar is provided between the two individual steel bars connecting the second rotating units; the flip-stabilizing steel bar and the middle steel bar in the flip-stiffening bar are distributed in parallel at intervals; when the seat cushion frame assembly is stably arranged on the seat frame; the height of the central axis of the flip-stabilizing steel bar from the horizontal plane is greater than the height of the middle steel bar from the horizontal plane; the pull strap is arranged on the side of the flip-stabilizing steel bar away from the seat frame.

10. A seat according to claim 8, characterized in that, The first rotating unit includes a fixed bracket connected to the seat frame, and the fixed bracket and the seat frame can form a first rotating inner hole; the three-stage ribs in the flipping ribs are inserted into the corresponding first rotating inner hole; the limiting structure in the seat frame assembly also includes a limiting sheet metal disposed on the seat frame, the limiting sheet metal including a stepped overlapping plate; the stepped overlapping plate is provided with a connecting bracket; an insertion groove is formed between the connecting bracket and the stepped overlapping plate; the guide limiting steel bar in the limiting structure can be inserted into the insertion groove. The stepped overlapping plate includes a primary overlapping plate, a secondary overlapping plate, and a tertiary overlapping plate. Each of the two ends of the secondary overlapping plate has a primary overlapping plate and a tertiary overlapping plate respectively. The secondary overlapping plate intersects with the primary and tertiary overlapping plates. The stepped overlapping plate can be connected to the seat frame via the primary overlapping plate. The secondary overlapping plate and the primary overlapping plate are arranged on two sides of the square tube upper frame of the seat frame. One end of the connecting bracket is connected to the tertiary overlapping plate, and the other end extends freely. The connecting bracket is also a stepped plate structure.

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