Reinforced folding bicycle frame

Abstract

The utility model discloses a reinforced folding bicycle frame which comprises a head tube, an upper tube, a lower tube, a middle tube and a five-way joint, the upper tube is formed by connecting a front upper tube and a rear upper tube through an upper folder, the lower tube is formed by connecting a front lower tube and a rear lower tube through a lower folder, and the reinforced folding bicycle frame further comprises a front reinforcing tube and a rear reinforcing tube. The upper end of the front reinforcing tube is connected to the front seat body of the upper folder or / and the front upper tube close to the front seat body of the upper folder, and the lower end of the front reinforcing tube is connected to the front lower tube; the upper end of the rear reinforcing tube is connected to the middle tube, and the lower end of the rear reinforcing tube is connected to a rear seat body of the lower folder or / and a rear lower tube close to the rear seat body of the lower folder. The front reinforcing tube and the rear reinforcing tube are additionally arranged, so that a single front triangular structure of a traditional bicycle frame is changed into a multi-triangular structure, the transverse rigidity and the longitudinal rigidity of the bicycle frame are remarkably improved, and particularly the structural stability of the position of the folder is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of folding bicycle technology, specifically to a reinforced folding bicycle frame. Background Technology

[0002] Folding bicycles are widely used for urban commuting and short-distance travel due to their ease of carrying and storage. Most existing folding bicycle frames achieve folding and storage through a folding mechanism. However, the top and bottom tube folding mechanism, located in the middle of the top and bottom tubes without other support points, makes the frame prone to deformation under stress (such as during riding bumps or steering). In particular, the lateral and longitudinal rigidity at the folding mechanism connection point is insufficient, which can lead to problems such as loosening of the folding mechanism and fatigue deformation of the tubes over time, affecting riding safety and the frame's lifespan.

[0003] To address the issue of insufficient rigidity, existing technologies often employ methods such as thickening the tubing or using high-strength materials. However, this increases the frame weight, contradicting the lightweight design philosophy of folding bicycles. Some solutions also involve adding a single support rod for reinforcement, but this is insufficient to create a comprehensive load-bearing support system, and the targeted reinforcement effect on the folding mechanism is limited. Therefore, how to improve the rigidity of a dual-folding mechanism frame through structural optimization without significantly increasing weight has become a pressing technical problem in this field. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing double-folder folding bicycle frames, such as insufficient rigidity and poor stability of the folder position, and to provide a reinforced folding bicycle frame.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A reinforced folding bicycle frame includes a head tube, top tube, bottom tube, center tube, and bottom bracket. The top tube is formed by connecting a front top tube and a rear top tube through an upper folding mechanism. The bottom tube is formed by connecting a front bottom tube and a rear bottom tube through a lower folding mechanism. It also includes a front reinforcing tube and a rear reinforcing tube. The upper end of the front reinforcing tube is connected to the front seat of the upper folding mechanism or / and the front top tube near the front seat of the upper folding mechanism, and the lower end of the front reinforcing tube is connected to the front bottom tube. The upper end of the rear reinforcing tube is connected to the center tube, and the lower end is connected to the rear seat of the lower folding mechanism or / and the rear bottom tube near the rear seat of the lower folding mechanism.

[0007] Furthermore, the upper end of the front reinforcing tube is connected to the front seat of the upper folding device, and the lower end of the front reinforcing tube is connected to the front lower tube; the upper end of the rear reinforcing tube is connected to the middle tube, and the lower end is connected to the rear seat of the lower folding device.

[0008] Furthermore, the upper end of the front reinforcing tube is connected to both the front seat of the upper folder and the front upper tube near the front seat of the upper folder, and the lower end of the front reinforcing tube is connected to the front lower tube; the upper end of the rear reinforcing tube is connected to the middle tube, and the lower end is connected to both the rear seat of the lower folder and the rear lower tube near the rear seat of the lower folder.

[0009] Furthermore, the lower end of the front reinforcing tube is connected to the bend of the front lower tube.

[0010] Compared with the prior art, this utility model has the following advantages:

[0011] This invention adds front and rear reinforcing tubes, transforming the traditional single front triangle structure of the frame into multiple triangle structures. This significantly improves the lateral and longitudinal rigidity of the frame, especially enhancing the structural stability of the folding mechanism. As a result, the frame not only has a folding function but also greater durability and safety. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 For use Figure 1 A schematic diagram of the frame of a folding bicycle shown.

[0014] Figure 1 The folding handle is not shown in the drawing.

[0015] The markings in the diagram are: 1. Head tube; 2. Upper tube; 21. Front upper tube; 22. Rear upper tube; 3. Lower tube; 31. Front lower tube; 32. Rear lower tube; 4. Middle tube; 5. Bottom connector; 6. Front reinforcing tube; 7. Rear reinforcing tube; 8. Upper folding device; 9. Lower folding device. Detailed Implementation

[0016] Example 1

[0017] like Figure 1 , Figure 2As shown, this embodiment provides a reinforced folding bicycle frame including a head tube 1, an upper tube 2, a lower tube 3, a middle tube 4, a bottom bracket 5, a front reinforcing tube 6, a rear reinforcing tube 7, an upper folding mechanism 8, and a lower folding mechanism 9. The upper tube 2 is formed by connecting a front upper tube 21 and a rear upper tube 22 via the upper folding mechanism 8. The lower tube 3 is formed by connecting a front lower tube 31 and a rear lower tube 32 via the lower folding mechanism 9. Both the upper folding mechanism 8 and the lower folding mechanism 9 include a front seat, a rear seat, a middle assembly, and a lever. The front end of the front upper tube 21 is connected to the head tube 1, and the rear end is connected to the front seat of the upper folding mechanism 8. The front end of the rear upper tube 22 is connected to the rear seat of the upper folding mechanism 8, and the rear end is connected to the middle tube 4. The front end of the front lower tube 31 is connected to the head tube 1, and the rear end is connected to the front seat of the lower folding mechanism 9. The front end of the rear lower tube 32 is connected to the rear seat of the lower folding mechanism 9, and the rear end is connected to the bottom bracket 5.

[0018] The upper end of the front reinforcing tube 6 is connected to both the front seat of the upper folding unit 8 and the front upper tube 21 near the front seat of the folding unit 8, while the lower end of the front reinforcing tube 6 is connected to the bend of the front lower tube 31. The upper end of the rear reinforcing tube 7 is connected to the middle tube 4, while the lower end is connected to both the rear seat of the lower folding unit 9 and the rear lower tube 32 near the rear seat of the lower folding unit 9. By setting the front reinforcing tube 6 and the rear reinforcing tube 7, the single front triangular structure between the head tube 1 and the middle tube 4 of the frame forms multiple triangular structures, thereby significantly improving the lateral and longitudinal rigidity of the frame and enhancing the structural stability of the folding unit position.

[0019] Example 2

[0020] The structure of the reinforced folding bicycle frame provided in this embodiment is basically the same as that in embodiment 1. The difference is that the upper end of the front reinforcing tube 6 is connected to the front seat of the upper folding device 8, and the lower end is connected to the front lower tube 31. The upper end of the rear reinforcing tube 7 is connected to the middle tube 4, and the lower end is connected to the rear seat of the lower folding device 9.

[0021] Example 3

[0022] The structure of the reinforced folding bicycle frame provided in this embodiment is basically the same as that in embodiment 1. The difference is that the upper end of the front reinforcing tube 6 is connected to the front seat of the upper folding device 8, and the lower end is connected to the front lower tube 31; the upper end of the rear reinforcing tube 7 is connected to the middle tube 4, and the lower end is connected to both the rear seat of the lower folding device 9 and the rear lower tube 32 near the rear seat of the lower folding device 9.

[0023] Example 4

[0024] The structure of the reinforced folding bicycle frame provided in this embodiment is basically the same as that in embodiment 1. The difference is that the upper end of the front reinforcing tube 6 is connected to both the front seat of the upper folding device 8 and the front upper tube 21 near the front seat of the upper folding device 8, and the lower end of the front reinforcing tube 6 is connected to the bend of the front lower tube 31; the upper end of the rear reinforcing tube 7 is connected to the middle tube 4, and the lower end is connected to the rear seat of the lower folding device 9.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any modifications and substitutions based on the technical solutions and inventive concepts provided by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A reinforced folding bicycle frame, comprising a head tube, a top tube, a bottom tube, a center tube, and a bottom bracket, wherein the top tube is formed by connecting a front top tube and a rear top tube via an upper folding mechanism, and the bottom tube is formed by connecting a front bottom tube and a rear bottom tube via a lower folding mechanism, characterized in that: It also includes a front reinforcing tube and a rear reinforcing tube. The upper end of the front reinforcing tube is connected to the front seat of the upper folder and / or the front upper tube near the front seat of the upper folder, and the lower end of the front reinforcing tube is connected to the front lower tube. The upper end of the rear reinforcing tube is connected to the middle tube, and the lower end is connected to the rear seat of the lower folder and / or the rear lower tube near the rear seat of the lower folder.

2. The reinforced folding bicycle frame according to claim 1, characterized in that: The upper end of the front reinforcing tube is connected to the front seat of the upper folding device, and the lower end of the front reinforcing tube is connected to the front lower tube; the upper end of the rear reinforcing tube is connected to the middle tube, and the lower end is connected to the rear seat of the lower folding device.

3. The reinforced folding bicycle frame according to claim 1, characterized in that: The upper end of the front reinforcing tube is connected to both the front seat of the upper folder and the front upper tube near the front seat of the upper folder, and the lower end of the front reinforcing tube is connected to the front lower tube; the upper end of the rear reinforcing tube is connected to the middle tube, and the lower end is connected to both the rear seat of the lower folder and the rear lower tube near the rear seat of the lower folder.

4. The reinforced folding bicycle frame according to claim 2, characterized in that: The lower end of the front reinforcing tube is connected to the bend of the front lower tube.

5. The reinforced folding bicycle frame according to claim 3, characterized in that: The lower end of the front reinforcing tube is connected to the bend of the front lower tube.

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