Foldable four-wheeler frame

Abstract

The utility model discloses a foldable four-wheeler frame which comprises a keel, at least one first folding piece is arranged on the keel, a second folding piece is arranged on each first folding piece, a third folding piece is arranged on each second folding piece, and the first folding piece and the second folding piece are arranged on the keel. The first folding piece, the second folding piece and the third folding piece are rotatably connected, and a pull handle for limiting the second folding piece is arranged at the connecting end of the first folding piece and the second folding piece. According to the foldable four-wheeler frame, the flexible and compact folding effect is achieved through a multi-direction rotating folding structure, stable load bearing during unfolding is guaranteed through cooperation with a linkage type locking mechanism, and tight folding is achieved after folding. The unique pull handle control assembly can synchronously trigger the multiple limiting buckles, and one-key unlocking and rapid folding operation are achieved.

Description

Technical Field

[0001] This utility model relates to the field of folding four-wheeled vehicle technology, specifically a foldable four-wheeled vehicle frame. Background Technology

[0002] Existing four-wheeled vehicle frames generally suffer from problems such as complex operation, loose structure, and insufficient portability in their folding designs. Traditional folding solutions mostly use a single-direction folding structure, resulting in limited reduction in volume after folding, which is insufficient to meet the needs of urban commuting or storage in confined spaces. At the same time, the locking mechanism mostly relies on individual buckles or bolts for fixation, requiring users to manually operate each one, which is cumbersome and carries the risk of accidental locking or incomplete unlocking, affecting efficiency and safety. In addition, the folded frame lacks stable support points, making it prone to tilting and falling apart when towed, resulting in a poor carrying experience. Although some products have attempted to optimize the folding structure, insufficient component linkage often leads to a decrease in rigidity after unfolding, or problems such as joint jamming and uneven stress during folding. To address these pain points, there is an urgent need for an integrated frame design solution that combines quick folding, stable locking, compact storage, and convenient movement. Utility Model Content

[0003] The purpose of this invention is to provide a foldable four-wheeled vehicle frame to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a foldable four-wheeled vehicle frame, comprising:

[0005] keel;

[0006] The keel is provided with at least one first folding member, each first folding member is provided with a second folding member, and the second folding member is provided with a third folding member;

[0007] The first folding member, the second folding member, and the third folding member are all rotatably connected.

[0008] The connecting end of the first folding member and the second folding member is provided with a pull handle for limiting the second folding member.

[0009] Preferably, the handle is connected to the transmission component, the input end of the transmission component is located on the snap-fit ​​component, the output end of the transmission component is located on the support plate, the output end of the transmission component is provided with a limiting component, and the limiting component is connected with a telescopic buckle.

[0010] Preferably, the transmission element includes at least one of the output terminals.

[0011] Preferably, the second folding member is provided with a connector, and the connecting end of the connector is provided with a slider. One end of the slider is connected to a sliding lock, and the slider can slide horizontally.

[0012] Preferably, the support frame has a sliding groove, and the sliding member and the sliding lock are disposed in the sliding groove.

[0013] Preferably, the second folding member is provided with a connecting block, which connects to the third folding member.

[0014] Preferably, all the first folding pieces are provided with the support frame, all the support frames are connected by a crossbeam, and the crossbeam is connected to the pull handle.

[0015] Preferably, the keel is connected to a handle and a lifting wheel, the handle being used to lift one end of the keel, and the lifting wheel being used to support the lifted keel.

[0016] Preferably, the keel is also provided with a control lever, and the control lever is provided with a latch for folding the control lever.

[0017] Compared with existing technologies, the advantages of this utility model are as follows: This foldable four-wheeled vehicle frame achieves a flexible and compact folding effect through a multi-directional rotating folding structure. Combined with a linkage locking mechanism, it ensures stable load-bearing when unfolded and tight folding when closed. A unique pull handle control component can simultaneously trigger multiple limit latches, enabling one-button unlocking and quick folding operations, simplifying the traditional multi-step folding process. During folding, each connecting component smoothly retracts along a preset slide rail, avoiding misalignment and jamming. Simultaneously, the bottom lifting wheel and flip-up handle form a lever support, allowing users to easily drag the folded frame with one hand. The overall design, while maintaining structural strength, significantly improves portability and storage efficiency through optimized force transmission paths and modular folding units, making it particularly suitable for transportation and storage needs in confined space scenarios. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall front structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the overall structure of the rear of this utility model;

[0020] Figure 3 This is a partial bottom view of the structure of this utility model;

[0021] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A;

[0022] Figure 5 This is a schematic diagram of the folding component structure of this utility model.

[0023] In the diagram: 1. Keel; 2. Handle; 3. First folding piece; 4. Second folding piece; 41. Connector; 411. Sliding piece; 412. Sliding lock; 413. Slide groove; 5. Third folding piece; 51. Connecting block; 6. Support frame; 7. Control lever; 71. Lock; 8. Crossbeam; 9. Lifting wheel; 10. Pull handle; 101. Snap-fit ​​piece; 102. Transmission piece; 1021. Limiting piece; 1022. Telescopic buckle; 103. Bearing plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5 This utility model provides a technical solution: a foldable four-wheeled vehicle frame, comprising: a keel 1, which serves as the main load-bearing body of the frame and is used to connect the remaining structures; at least one first folding member 3 is provided on the keel 1, which is used to support the support frame 6 and the crossbeam 8, serving as the seat support structure of the four-wheeled vehicle; a second folding member 4 is provided on each first folding member 3, which serves as the lumbar support on the four-wheeled vehicle seat; a third folding member 5 is provided on the second folding member 4, which serves as the handle frame on the four-wheeled vehicle seat; the first folding member 3, the second folding member 4, and the third folding member 5 are all rotatably connected, allowing for rotational folding during folding; a pull handle 10 is provided at the connection end of the first folding member 3 and the second folding member 4 for limiting the second folding member 4, and the pull handle 10 is used to control the locking control mechanism between the first folding member 3 and the second folding member 4.

[0026] The pull handle 10 is connected to the transmission component 102, which can be used as the wire-threading structure of a bicycle. It contains a built-in metal wire connected to the pull handle 10. The input end of the transmission component 102 is located on the locking member 101, which limits the transmission component 102 to prevent the outer casing of the transmission component 102 from moving along with it when the pull handle 10 is operated to pull the built-in metal wire, thus rendering the transmission component 102 ineffective. The output end of the transmission component 102 is located on the support plate 103, which limits the other end of the transmission component 102. A limiting member 1021 is provided on the output end of the transmission component 102, which engages with the support plate 103 to ensure that the telescopic buckle 1022 does not detach from the support plate. The control of 103 includes a telescopic buckle 1022 connected to the limiting member 1021. The telescopic buckle 1022 is used to engage with the sliding lock 412 to limit the engagement of the sliding lock 412, thereby ensuring control of the second folding member 4 and preventing the sliding lock 412 from suddenly shifting on the slide groove 413 during use, causing it to change into a folded state and thus causing an accident. The transmission member 102 includes at least one output end. Since there are two first folding members 3, two second folding members 4 and three third folding members 5, which are arranged in opposite mirror images on both sides of the keel 1, this design can better support the support frame 6 and the crossbeam 8. Therefore, the two output ends of the transmission member 102 can simultaneously control the first folding members 3 and the second folding members 4 on both sides.

[0027] The second folding piece 4 is provided with a connector 41, which can stabilize the connection between the first folding piece 3 and the second folding piece 4. The connecting end of the connector 41 is provided with a slider 411. The slider 411 is used to drive the sliding lock 412 and the connector 41 to slide in the slide groove 413, thereby ensuring that the second folding piece 4 and the first folding piece 3 can be folded. One end of the slider 411 is connected to the sliding lock 412. The shape of the sliding lock 412 matches the shape of the telescopic buckle 1022. The slider 411 can slide horizontally. The support frame 6 is provided with a slide groove 413. The slider 411 and the sliding lock 412 are located in the slide groove 413. The second folding piece 4 is provided with a connecting block 51, which connects to the third folding piece 5.

[0028] Each of the first folding parts 3 is equipped with a support frame 6, which serves as the skeleton of the frame and seat. All support frames 6 are connected by a crossbeam 8, which supports the handle 10. The crossbeam 8 and the handle 10 are connected. The keel 1 is connected to a handle 2 and a lifting wheel 9. After the first folding parts 3, the second folding parts 4, the third folding parts 5, and the control lever 7 are folded, the folded four-wheeled vehicle can be lifted by the handle 2. The other end of the handle 2 is supported by the lifting wheel 9. The handle 2 is used to lift one end of the keel 1, and the lifting wheel 9 is used to support the lifted keel 1.

[0029] The keel 1 is also equipped with a control lever 7, and the control lever 7 is equipped with a latch 71 for folding the control lever 7.

[0030] When using the foldable four-wheeled vehicle frame, operating the handle 10 synchronously pulls the telescopic buckles 1022 on both sides to disengage from the sliding lock 412 via the metal wire in the transmission component 102, releasing the horizontal limit on the sliding component 411; at this time, the sliding component 411 of the second folding component 4 moves along the slide groove 413 of the support frame 6, linking the first folding component 3 and the second folding component 4 to rotate and fold around the connecting shaft, and the connecting component 41 strengthens the support effect of the first folding component 3 and the second folding component 4, while the third folding component 5 folds in sync with the connecting block 51; in the unfolded state, the handle 10 resets so that the telescopic buckles 1022 are embedded in the sliding lock 412, and a double lock is formed with the bearing plate 103 through the limiting component 1021 to ensure the rigid connection between the support frame 6 and the crossbeam 8; during the folding process, the handle 2 and the lifting wheel 9 form a lever fulcrum, which retracts synchronously with the lock 71 of the control lever 7, making the whole frame compactly folded.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foldable four-wheeled vehicle frame, characterized in that, include: Keel (1); The keel (1) is provided with at least one first folding member (3), each first folding member (3) is provided with a second folding member (4), and the second folding member (4) is provided with a third folding member (5); The first folding member (3), the second folding member (4), and the third folding member (5) are all rotatably connected; The connecting end of the first folding member (3) and the second folding member (4) is provided with a pull handle (10) for limiting the second folding member (4).

2. The foldable four-wheeled vehicle frame according to claim 1, characterized in that: The pull handle (10) is connected to the transmission component (102). The input end of the transmission component (102) is located on the snap-fit ​​component (101), and the output end of the transmission component (102) is located on the support plate (103). A limiting component (1021) is provided on the output end of the transmission component (102), and a telescopic buckle (1022) is connected to the limiting component (1021).

3. A foldable four-wheeled vehicle frame according to claim 2, characterized in that: The transmission element (102) includes at least one of the output terminals.

4. A foldable four-wheeled vehicle frame according to claim 2, characterized in that: The second folding member (4) is provided with a connector (41), and a slider (411) is provided on the connecting end of the connector (41). One end of the slider (411) is connected to a sliding lock (412), and the slider (411) can slide horizontally.

5. A foldable four-wheeled vehicle frame according to claim 4, characterized in that: The support frame (6) is provided with a sliding groove (413), and the sliding member (411) and the sliding latch (412) are provided in the sliding groove (413).

6. A foldable four-wheeled vehicle frame according to any one of claims 1-5, characterized in that: The second folding member (4) is provided with a connecting block (51), which connects to the third folding member (5).

7. A foldable four-wheeled vehicle frame according to claim 5, characterized in that: All of the first folding pieces (3) are provided with the support frame (6), and all the support frames (6) are connected by the crossbeam (8), which is connected to the pull handle (10).

8. A foldable four-wheeled vehicle frame according to claim 1, characterized in that: The keel (1) is connected to a handle (2) and a lifting wheel (9). The handle (2) is used to lift one end of the keel (1), and the lifting wheel (9) is used to support the lifted keel (1).

9. A foldable four-wheeled vehicle frame according to claim 1, characterized in that: The keel (1) is also provided with a control lever (7), and the control lever (7) is provided with a latch (71) for folding the control lever (7).

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