Expansion frame

Abstract

The utility model relates to the technical field of trailer frames, in particular to an expansion frame which is applied to a trailer frame, the trailer frame comprises a main body frame used for being connected with an external automobile and a double-wheel support used for supporting two bicycles, the main body frame is fixedly connected with the double-wheel support, the main body frame is provided with a connecting column body, and the connecting column body is connected with the double-wheel support. The expansion bicycle frame comprises a support detachably connected with the connecting column body and a bicycle wheel support used for bearing a bicycle, and the support is fixedly connected with the bicycle wheel support. Therefore, according to the expansion frame, the connecting column on the trailer frame is used as the connecting interface to be detachably connected with the trailer frame, so that the flexibility of mounting and dismounting is ensured. The expansion frame is stable in structure and can effectively bear the weight of a bicycle. After the expansion frame is installed on a trailer frame, the number of loaded bicycles of the trailer frame is increased to three from original two, and the actual requirement of a user for transporting three bicycles is met.

Description

Technical Field

[0001] This utility model relates to the field of trailer frame technology, and in particular to an extended trailer frame. Background Technology

[0002] A trailer rack is a frame structure installed at the rear of a car for securing and transporting bicycles. Through its unique structural design, it can securely and firmly fix bicycles to the vehicle, facilitating bicycle transport and meeting the needs of daily commutes and short-distance transportation. However, most commercially available trailer racks typically only accommodate two bicycles at a time, making it difficult to add a third bicycle. Addressing this limitation and increasing the number of bicycles a trailer rack can carry without affecting its original functionality has become a pressing technical challenge. Utility Model Content

[0003] In view of this, the present invention proposes an extended vehicle frame, which aims to solve the problem of the limited number of vehicles that can be carried by existing trailer frames.

[0004] This utility model proposes an extended frame for use in trailer racks. The trailer rack includes a main frame for connecting to an external car and a dual-wheel support for supporting two bicycles. The main frame and the dual-wheel support are fixedly connected. The main frame is provided with a connecting column. The extended frame includes a bracket detachably connected to the connecting column and a single-wheel support for supporting one bicycle. The bracket and the single-wheel support are fixedly connected.

[0005] In one possible implementation, the main frame includes a left rod and a right rod, the connecting column includes a left connecting column and a right connecting column, the left connecting column is connected to the left rod, the right connecting column is connected to the right rod, the bracket includes a left component and a right component, the left component and the right component have the same structure and are arranged symmetrically from left to right, the left component has a left connecting structure, the right component has a right connecting structure, the left connecting structure is detachably connected to the left connecting column, and the right connecting structure is detachably connected to the right connecting column.

[0006] In one possible implementation, the left component is an L-shaped structure, the left connecting structure is disposed on the short side of the L-shaped structure, and the long side of the L-shaped structure is connected to the bicycle wheel support.

[0007] In one possible implementation, the left connecting post includes a first post and a second post that are independently disposed, both of which are located in the middle region of the left rod.

[0008] In one possible implementation, the left connecting structure includes a movable rod and a torsion spring. The side of the short side is provided with a rotating column, a fixed rod, and a first through hole with an opening. The movable rod is connected to the rotating column and can rotate around the rotating column. The torsion spring body is sleeved on the outside of the fixed rod. The first torsion arm of the torsion spring is connected to the short side, and the second torsion arm of the torsion spring is connected to the movable rod. The movable rod is provided with a wedge-shaped structure and a second through hole with an opening. The wedge-shaped structure is located at the bottom end of the movable rod, and the second through hole is located above the wedge-shaped structure and blocks the opening of the first through hole.

[0009] When the first column presses against the wedge structure along the direction of the wedge structure, the movable rod rotates forward around the rotating column to open the opening of the first through hole and cause the torsion spring to deform; when the first column passes through the opening of the first through hole along the direction of the wedge structure, the first column and the wedge structure separate, the torsion spring resets and causes the movable rod to rotate in the opposite direction around the rotating column to block the opening of the first through hole again. At the same time, the first column continues to pass through the opening of the second through hole and extends into the hole formed by the enclosed opening of the first through hole and the second through hole.

[0010] In one possible implementation, the left connecting structure is located at the rear end of the short side, and the front end of the short side is provided with a third through hole with an opening. The radial dimension of the third through hole is slightly larger than the radial dimension of the second column. When the second column passes through the opening of the third through hole and extends into the third through hole, the first column squeezes the wedge structure and extends into the hole along the direction of the wedge structure.

[0011] In one possible implementation, the wheel holder of the single wheel is a plastic wheel holder.

[0012] In one possible implementation, at least one reinforcing rod is provided between the left member and the right member, with one end of the reinforcing rod connected to the left member and the other end connected to the right member.

[0013] In one possible implementation, one end of the connecting column is connected to the main frame, and the other end of the connecting column is also connected to a limiting block, the radial dimension of which is greater than the radial dimension of the connecting column.

[0014] In one possible implementation, the bicycle wheel support includes a support rod for supporting the bicycle, a left cable tie for connecting the left wheel of the bicycle, and a right cable tie for connecting the right wheel of the bicycle. The left cable tie and the right cable tie are both connected to the support rod and are arranged symmetrically on both sides.

[0015] Compared with existing technologies, the advantages of this utility model are as follows: An extended bicycle frame, applied to a trailer rack, includes a main frame for connecting to an external car and dual wheel supports for supporting two bicycles. The main frame and the dual wheel supports are fixedly connected. The main frame is provided with a connecting column. The extended bicycle frame includes a bracket detachably connected to the connecting column and a single wheel support for supporting one bicycle. The bracket and the single wheel support are fixedly connected. It is evident that this extended bicycle frame utilizes the connecting column on the trailer rack as a connection interface, establishing a detachable connection with the trailer rack, ensuring flexibility in installation and disassembly. The extended bicycle frame itself has a stable structure and can effectively support the weight of one bicycle. After installing this extended bicycle frame on the trailer rack, the number of bicycles the trailer rack can carry increases from two to three, improving the transportation capacity of traditional trailer racks and meeting the user's actual need to transport three bicycles. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the extended frame provided in an embodiment of the present utility model;

[0017] Figure 2 This is a structural diagram of the left component and the left connecting structure provided in an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of a first structure for mounting an extended vehicle frame to a trailer frame, provided as an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of a second structure for mounting an extended vehicle frame to a trailer frame, provided as an embodiment of the present invention.

[0020] Figure 5 A schematic diagram of the disassembly structure of the extended vehicle frame and trailer frame provided in the embodiments of this utility model;

[0021] Figure 6 This is a schematic diagram of the trailer frame provided in an embodiment of the present utility model.

[0022] The annotations in the attached figures are explained as follows:

[0023] 10. Trailer frame; 11. Left rod; 111. First column; 112. Second column; 12. Limiting block; 21. Left piece; 211. Rotating column; 22. Movable rod; 221. Wedge structure; 23. Torsion spring; 24. Hole; 25. Third through hole; 26. Reinforcing rod; 271. Support rod; 272. Left cable tie; 273. Right cable tie. Detailed Implementation

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

[0025] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and sliding situation between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] Please refer to Figure 1-6 As shown, this utility model proposes an extended frame for use in a trailer rack 10. The trailer rack 10 includes a main frame for connecting to an external car and a dual-wheel support for supporting two bicycles. The main frame and the dual-wheel support are fixedly connected. The main frame is provided with a connecting column. The extended frame includes a bracket detachably connected to the connecting column and a single-wheel support for supporting one bicycle. The bracket and the single-wheel support are fixedly connected.

[0028] Specifically, the extension frame, as an accessory to the trailer frame 10, is detachably connected to the trailer frame 10. During use, it is securely integrated with the trailer frame 10; when not in use, it can be quickly disassembled, restoring the trailer frame 10 to its original state and ensuring its original functions remain unaffected. The extension frame's bracket and single-wheel holder are fixedly connected to ensure the overall stability and load-bearing capacity of the extension section, stably and securely supporting the weight of a bicycle. It should be noted that the structural design of the extension frame must be highly compatible with the original trailer frame 10 to avoid physical interference with its components (such as dual wheel holders, frame interfaces, etc.), ensuring smooth installation and preventing friction, collisions, or damage during use.

[0029] Compared with existing technologies, the extended frame proposed in this embodiment utilizes the connecting column on the trailer frame 10 as a connection interface to establish a detachable connection with the trailer frame 10, ensuring flexibility in installation and disassembly. The extended frame itself has a stable structure and can effectively support the weight of a bicycle. After installing the extended frame on the trailer frame 10, the number of bicycles that the trailer frame 10 can carry increases from two to three, improving the transportation capacity of the traditional trailer frame 10 and meeting the user's actual need to transport three bicycles.

[0030] In some embodiments of this application, the main frame includes a left rod 11 and a right rod, the connecting column includes a left connecting column and a right connecting column, the left connecting column is connected to the left rod 11, the right connecting column is connected to the right rod, the bracket includes a left piece 21 and a right piece, the left piece 21 and the right piece have the same structure and are symmetrically arranged, the left piece 21 is provided with a left connecting structure, the right piece is provided with a right connecting structure, the left connecting structure is detachably connected to the left connecting column, and the right connecting structure is detachably connected to the right connecting column.

[0031] Specifically, the main frame of the traditional trailer frame 10 generally adopts a left-right symmetrical design, and the support of the extension frame also follows this symmetrical layout to meet the balance requirements of the mechanical structure, achieve uniform load distribution, and thus improve the overall stability after installation.

[0032] In some embodiments of this application, the left component 21 is an L-shaped structure, the left connecting structure is disposed on the short side of the L-shaped structure, and the long side of the L-shaped structure is connected to the wheel hub of the single wheel.

[0033] Specifically, the L-shaped structure resembles the letter "L" in shape, with distinct short and long sides. The short side serves as the connecting area, while the long side serves as the load-bearing area; both are integrally formed, maximizing space utilization and efficient force transmission. The left connecting structure is located on the short side for easy and accurate alignment with the left connecting post, enabling quick installation and disassembly. The long side connects to the bicycle wheel holder, bearing the weight of the bicycle transmitted by it. It should be noted that the height of the short side and the length of the long side should be rationally designed to avoid interference with the components of the existing trailer frame 10, ensuring smooth installation and not affecting the normal use of the original structure.

[0034] In some embodiments of this application, the left connecting post includes a first post 111 and a second post 112 that are independently disposed, both of which are located in the middle region of the left rod 11.

[0035] Specifically, the middle area of ​​the left rod 11 is more open than the two ends, facilitating the arrangement of various components. Therefore, the first column 111 and the second column 112 are positioned in the middle area of ​​the left rod 11 to achieve a more rational structural layout. The first column 111, as a connector, is primarily responsible for bearing the weight of the extension frame and securing it, making it a key component ensuring a stable connection between the extension frame and the trailer frame 10. The second column 112, as a positioning element, ensures that the extension frame is quickly and accurately positioned in the correct location during assembly, thereby simplifying the installation process and improving installation efficiency. Simultaneously, the second column 112 also shares some of the load, further enhancing the overall structural stability.

[0036] In some embodiments of this application, the left connecting structure includes a movable rod 22 and a torsion spring 23. A rotating column 211, a fixed rod, and a first through hole with an opening are provided on the side of the short side. The movable rod 22 is connected to the rotating column 211 and can rotate around the rotating column 211. The torsion spring body of the torsion spring 23 is sleeved on the outside of the fixed rod. The first torsion arm of the torsion spring 23 is connected to the short side, and the second torsion arm of the torsion spring 23 is connected to the movable rod 22. The movable rod 22 is provided with a wedge-shaped structure 221 and a second through hole with an opening. The wedge-shaped structure 221 is located at the bottom end of the movable rod 22, and the second through hole is located above the wedge-shaped structure 221 and blocks the opening of the first through hole.

[0037] When the first column 111 presses against the wedge structure 221 along the direction of the wedge structure 221, the movable rod 22 rotates forward around the rotating column 211 to open the opening of the first through hole and cause the torsion spring 23 to deform; when the first column 111 passes through the opening of the first through hole along the direction of the wedge structure 221, the first column 111 and the wedge structure 221 separate, the torsion spring 23 resets and causes the movable rod 22 to rotate in the opposite direction around the rotating column 211 to block the opening of the first through hole again. At the same time, the first column 111 continues to pass through the opening of the second through hole and extends into the hole 24 formed by the first through hole and the second through hole.

[0038] Specifically, please refer to Figure 2As shown, the left connecting structure, through the cooperation of the movable rod 22 and the torsion spring 23, achieves locking and releasing of the first column 111. The movable rod 22 rotates around the rotating column 211, and its wedge-shaped structure 221, designed with the first and second through holes, allows the first column 111 to smoothly extend into the hole 24 and be securely locked, while also allowing it to easily disengage from the hole 24 for easy disassembly. The torsion spring 23, being elastic, assists in opening and closing the opening of the first through hole, ensuring both the stability of the locking and ease of release. When disassembling the extended frame, the user moves the movable rod 22 to rotate it clockwise around the rotating column 211 to open the opening of the first through hole, while the torsion spring 23 deforms. The user then applies further force to gradually disengage the first column 111 from the hole 24. After the first column 111 is completely disengaged from the hole 24, the user releases the movable rod 22. At this time, the torsion spring 23 returns to its original position, causing the movable rod 22 to rotate in the opposite direction around the rotating column 211, blocking the opening of the first through hole again and returning to the initial state. At this point, the connection between the extension frame and the trailer frame 10 is released, completing the disassembly. This left connection structure is simple in structure and easy to operate, ensuring both the firmness of the connection and enabling quick assembly and disassembly, making it highly feasible. It should be noted that the opening direction of the first through hole is downward, and the opening direction of the second through hole is backward, so that the hole 24 formed by the first and second through holes can be better closed, reducing gaps and further enhancing the locking effect.

[0039] In some embodiments of this application, the left connecting structure is located at the rear end of the short side, and the front end of the short side is also provided with a third through hole 25 with an opening. The radial dimension of the third through hole 25 is slightly larger than the radial dimension of the second column 112. When the second column 112 passes through the opening of the third through hole 25 and extends into the third through hole 25, the first column 111 squeezes the wedge structure 221 and extends into the hole 24 along the direction of the wedge structure 221.

[0040] Specifically, when installing the extension frame onto the trailer frame 10, the user first guides the second column 112 through the opening of the third through hole 25 and into the third through hole 25, achieving initial alignment and positioning of the extension frame and the trailer frame 10. At this point, the cooperation between the second column 112 and the third through hole 25 ensures the accurate relative position of the two structures, avoiding misalignment or deviation during installation. Subsequently, the user continues to apply force, causing the first column 111 to press against the wedge-shaped structure 221 on the movable rod 22. The design of the wedge-shaped structure 221 allows the first column 111 to gradually approach the first through hole along the direction of the wedge-shaped structure 221 and finally extend into the hole 24 formed by the first and second through holes, achieving a locking connection and ensuring a stable and reliable connection. This operation process of positioning first and then locking is clear and simple, easy for users to master, and particularly suitable for assembly environments where space is limited and visibility is restricted. Users only need to complete the two steps of alignment and locking in sequence, without the need for complex tools, to quickly complete the assembly, significantly improving the convenience and efficiency of on-site installation. It should be noted that the opening of the third through hole 25 faces forward, allowing the user to easily fit the second post 112 directly into the third through hole 25 from the rear. This design conforms to the actual installation environment of the extended frame and the user's operating habits, further improving the convenience and efficiency of assembly. It should also be noted that the right connection structure and the left connection structure have the same structure, which will not be described in detail here.

[0041] In some embodiments of this application, the wheel holder of the unicycle is a plastic wheel holder.

[0042] Specifically, plastic wheel supports are made of lightweight and durable plastic materials, which are less expensive and have good corrosion resistance compared to traditional metal materials, thus achieving an effective balance between economy and durability while ensuring support performance.

[0043] In some embodiments of this application, at least one reinforcing rod 26 is provided between the left member 21 and the right member, with one end of the reinforcing rod 26 connected to the left member 21 and the other end of the reinforcing rod 26 connected to the right member.

[0044] Specifically, the reinforcement bar 26 installed between the left component 21 and the right component effectively enhances the connection strength between them, preventing deformation and loosening of the extended frame and improving the durability and safety of the structure. Of course, in practical applications, the number and distribution of the reinforcement bars 26 can be flexibly adjusted according to structural requirements (such as installing two parallel reinforcement bars 26 between the left component 21 and the right component) to adapt to different design requirements and usage environments.

[0045] In some embodiments of this application, one end of the connecting column is connected to the main frame, and the other end of the connecting column is also connected to a limiting block 12, wherein the radial dimension of the limiting block 12 is greater than the radial dimension of the connecting column.

[0046] Specifically, limiting blocks 12 are provided at the outer ends of the first column 111 and the second column 112. These limiting blocks 12, with their large radial dimensions, effectively restrict the axial movement of the hole 24 along the first column 111 and the third through hole 25 along the second column 112. When a vehicle is in motion, road bumps generate vibrations and impacts, potentially causing axial movement of the extended frame (i.e., axial displacement of the hole 24 along the first column 111 and axial displacement of the third through hole 25 along the second column 112). Without the limiting blocks 12, the extended frame might eventually detach from the trailer frame 10, significantly reducing the overall structural stability and safety. By providing the limiting blocks 12 with their large radial dimensions, a physical barrier is formed between the connecting column and the extended frame, preventing axial movement of the extended frame and significantly improving the connection's strength and seismic resistance. It should be noted that the combination structure of connecting columns with uniform radial dimensions and limiting blocks 12 with larger radial dimensions is more convenient for installation and disassembly, and the manufacturing process is simpler, compared to directly using connecting columns whose radial dimensions gradually increase from the end closer to the main frame to the end farther away from the main frame. Because the radial dimensions of the connecting columns gradually increase, the manufacturing difficulty increases accordingly, the manufacturing cost is higher, and they are prone to jamming the extension frame during assembly and disassembly, leading to inconvenience.

[0047] In some embodiments of this application, the bicycle wheel support includes a support rod 271 for supporting the bicycle, a left cable tie 272 for connecting the left wheel of the bicycle, and a right cable tie 273 for connecting the right wheel of the bicycle. The left cable tie 272 and the right cable tie 273 are both connected to the support rod 271 and are arranged symmetrically on the left and right sides.

[0048] Specifically, to more securely hold the bicycle in place, the extended frame, in addition to the key load-bearing component support rod 271, also includes left and right cable ties 272 and 273 to further secure the bicycle wheels. These auxiliary devices effectively prevent the bicycle from wobbling or slipping during transport, further enhancing its safety. Of course, to further stabilize the bicycle, connecting devices for attaching to the bicycle frame can also be provided; examples will not be elaborated here.

[0049] The extended frame structure provided by this utility model is compact and features a detachable connection design with the trailer frame 10, making installation and disassembly convenient and quick. The connecting column, through its coordinated action with the connecting structure, not only enables rapid locking of the extended frame and trailer frame 10 but also ensures accurate and secure connection. Furthermore, the limiting block 12 further prevents loosening of the connection, significantly improving the overall structural stability and safety, and demonstrating strong feasibility.

[0050] It should be noted that the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0051] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. An extension frame for use in a trailer rack, the trailer rack comprising a main frame for connecting an external vehicle and dual wheel supports for supporting two bicycles, the main frame and the dual wheel supports being fixedly connected, characterized in that, The main frame is provided with a connecting column, and the extended frame includes a bracket detachably connected to the connecting column and a single wheel holder for supporting a bicycle. The bracket and the single wheel holder are fixedly connected.

2. The extended frame according to claim 1, characterized in that, The main frame includes a left rod and a right rod, and the connecting column includes a left connecting column and a right connecting column. The left connecting column is connected to the left rod, and the right connecting column is connected to the right rod. The bracket includes a left component and a right component. The left component and the right component have the same structure and are arranged symmetrically from left to right. The left component has a left connecting structure, and the right component has a right connecting structure. The left connecting structure is detachably connected to the left connecting column, and the right connecting structure is detachably connected to the right connecting column.

3. An extended frame according to claim 2, characterized in that, The left component has an L-shaped structure, and the left connecting structure is disposed on the short side of the L-shaped structure. The long side of the L-shaped structure is connected to the wheel holder of the single wheel.

4. An extended frame according to claim 3, characterized in that, The left connecting post includes a first post and a second post that are set independently, and both the first post and the second post are located in the middle area of ​​the left rod.

5. An extended frame according to claim 4, characterized in that, The left connecting structure includes a movable rod and a torsion spring. The side of the short side is provided with a rotating column, a fixed rod, and a first through hole with an opening. The movable rod is connected to the rotating column and can rotate around the rotating column. The torsion spring body is sleeved on the outside of the fixed rod. The first torsion arm of the torsion spring is connected to the short side, and the second torsion arm of the torsion spring is connected to the movable rod. The movable rod is provided with a wedge-shaped structure and a second through hole with an opening. The wedge-shaped structure is located at the bottom end of the movable rod, and the second through hole is located above the wedge-shaped structure and blocks the opening of the first through hole. When the first column presses against the wedge structure along the direction of the wedge structure, the movable rod rotates forward around the rotating column to open the opening of the first through hole and cause the torsion spring to deform; when the first column passes through the opening of the first through hole along the direction of the wedge structure, the first column and the wedge structure separate, the torsion spring resets and causes the movable rod to rotate in the opposite direction around the rotating column to block the opening of the first through hole again. At the same time, the first column continues to pass through the opening of the second through hole and extends into the hole formed by the enclosed opening of the first through hole and the second through hole.

6. An extended frame according to claim 5, characterized in that, The left connecting structure is located at the rear end of the short side, and the front end of the short side is also provided with a third through hole with an opening. The radial dimension of the third through hole is slightly larger than the radial dimension of the second column. When the second column passes through the opening of the third through hole and extends into the third through hole, the first column squeezes the wedge structure and extends into the hole along the direction of the wedge structure.

7. An extended frame according to claim 1, characterized in that, The wheel holder of the single wheel is a plastic wheel holder.

8. An extended frame according to claim 2, characterized in that, At least one reinforcing rod is provided between the left component and the right component, with one end of the reinforcing rod connected to the left component and the other end connected to the right component.

9. An extended frame according to claim 1, characterized in that, One end of the connecting column is connected to the main frame, and the other end of the connecting column is also connected to a limiting block. The radial dimension of the limiting block is larger than the radial dimension of the connecting column.

10. An extended frame according to claim 1, characterized in that, The bicycle wheel support includes a support rod for supporting the bicycle, a left cable tie for connecting the left wheel of the bicycle, and a right cable tie for connecting the right wheel of the bicycle. The left cable tie and the right cable tie are both connected to the support rod and are arranged symmetrically on the left and right sides.

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