Folding bicycle frame with full-triangle triangular pyramid structure

Abstract

The utility model discloses a folding bicycle frame with a full-triangle triangular pyramid structure, which comprises a left upper fork, a right upper fork, a left grabber, a right grabber, a middle tube, a left lower fork, a right lower fork, a five-way joint, a rear beam tube, a front beam tube and a folding box, the upper ends of the left upper fork and the right upper fork are connected with the middle tube, the lower ends of the left upper fork and the left lower fork are connected with the left grabber, and the lower ends of the right upper fork and the right lower fork are connected with the right grabber. The lower ends of the right upper fork and the right lower fork are connected with the right grabber, the left upper fork, the left lower fork, the left grabber and the middle pipe form a left rear tripod, and the right upper fork, the right lower fork, the right grabber and the middle pipe form a right rear tripod; reinforcing pipes are arranged at the ends, close to the folding box, of the bottom bracket and the rear beam pipe, and the reinforcing beam, the middle pipe and the rear beam pipe form a front tripod. The bicycle frame has the advantages that the strength is high, the stress of the bearing triangular area is uniform, the attractiveness is high, the bicycle frame forms a three-dimensional full-triangular pyramid stress load structure, and the bearing capacity of the bicycle frame is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of bicycle frames, and in particular to the technical field of folding bicycle frames with a full triangular pyramid structure. Background Technology

[0002] Folding bicycles are a type of bicycle. Generally, folding bicycles consist of a folding frame joint and a folding seat tube joint. By folding the frame, the front and rear wheels are folded together, reducing the length by about 45%. Folding bicycles are convenient to carry and use, comfortable, and have a mature manufacturing process. The stress on the bicycle frame is distributed to the front and rear wheels through the front and rear forks. The rear fork connects the bicycle frame to the rear wheel, and its strength requirements are higher than those of the front fork. The bottom tube of a folding bicycle connects to the saddle, which is extendable on the bottom tube. The main frame tube folds in the middle, and from the folding point, it can be divided into the front and rear frames. The rear frame tube has the same diameter as the front frame tube, and one end connects to the bottom tube, which in turn connects to the rear fork. The rear frame tube connects to the bottom bracket and the rear fork only through two thin chainstays. The thickness difference between the rear frame tube, bottom tube, and chainstays is very large, which does not achieve optimal strength in terms of frame structure and load-bearing capacity. Utility Model Content

[0003] The purpose of this invention is to optimize the stress distribution problem of folding bicycle frames in existing technologies. It proposes a full triangular pyramid structure folding bicycle frame, which enables the frame to have a more even and robust load distribution, improves the load-bearing capacity of the bicycle frame, and has high strength, uniform stress distribution, and high aesthetic appeal.

[0004] To achieve the above objectives, this utility model proposes a folding bicycle frame with a full triangular pyramid structure, including a left upper fork, a right upper fork, a left pawl hook, a right pawl hook, a center tube, a left lower fork, a right lower fork, a bottom bracket, a rear beam tube, a front beam tube, and a folding box. The upper ends of the left and right upper forks are connected to the center tube, the lower ends of the left upper and left lower forks are connected to the left pawl hook, and the lower ends of the right upper and right lower forks are connected to the right pawl hook. The left upper fork, left lower fork, left pawl hook, and center tube form a left rear triangle frame. The right upper fork, The right lower fork, right claw hook, and center tube form the right rear triangle. The rear beam tube of the frame is located above the bottom bracket. The center tube is perpendicular to the bottom bracket and its outer circular surface is welded to one side of the bottom bracket. One end of the center tube and the rear beam tube are fixedly connected. The other end of the rear beam tube is connected to the rear side of the folding box. The front side of the folding box is connected to the front beam tube. The left and right lower forks are both fixedly welded to the upper side of the bottom bracket. The bottom bracket and the rear beam tube have a reinforcing tube near the folding box. The reinforcing tube, center tube, and rear beam tube form the front triangle.

[0005] In this design, the frame structure behind the folding position of the folding bicycle has been improved. The front and rear beam tubes are folded and connected to each other. With the center tube as the center, multiple triangular supports are formed in the front and rear directions of the center tube between the center tube and the rear wheel, and between the center tube and the rear beam tube. The triangular supports are combined to form a triangular or multi-sided pyramidal structure. This structure has a more uniform load distribution and is more robust, which can improve the load-bearing capacity of the bicycle frame.

[0006] In a preferred embodiment of this utility model, the upper ends of the left and right lower forks are connected to the middle tube and then extend towards the rear beam tube near the folding box as reinforcing tubes. The upper ends of the left and right lower forks intersect and are welded and fixed to the lower side of one end of the rear beam tube and the rear side of the folding box. The left and right lower forks are welded to both sides of the middle tube, and both are angled. The upper right and upper left forks are symmetrically welded to the middle tube. In this embodiment, the left and right lower forks are connected to the middle tube and then extend towards the connection point between the rear and front beam tubes. The connection point between the rear and middle tubes is at the top. With the middle tube and rear beam tube connected by the left and right lower forks, two triangular supports are formed between the middle tube and the rear beam tube.

[0007] In a preferred embodiment of this utility model, a hollow tube is provided as a single reinforcing tube between the bottom bracket and the rear beam tube near the end of the folding box. In this embodiment, the bottom bracket serves as a foot pedal connecting tube. The bottom bracket intersects perpendicularly with the middle tube and is welded to each other. The hollow tube connects the bottom bracket and the rear beam tube, which is equivalent to connecting the middle tube and the rear beam tube to each other. Thus, the middle tube, the rear beam tube, and the single reinforcing tube form a triangular support in front of the middle tube.

[0008] In a preferred embodiment of this invention, the positions of the left and right claw hooks are aligned with each other. The left and right claw hooks are connected to both sides of the rear wheel, so when the rear wheel is upright, the positions of the left and right claw hooks are aligned with each other.

[0009] In a preferred embodiment of this invention, the lower left and lower right forks are connected by a reinforcing plate, forming a bottom triangular area between the lower left and lower right forks and the center tube. The upper right and upper left forks are connected by an arc-shaped reinforcing plate, forming a top triangular area between the upper right and upper left forks and the center tube. The left and right rear tripods, the bottom and top triangular areas, and the left and right rear tripods combine to form a triangular pyramid structure. In this embodiment, the original left and right rear tripods are connected by a reinforcing plate to the lower left and lower right forks, and by an arc-shaped reinforcing plate to the upper right and upper left forks. This further forms a triangular or multi-faceted pyramid structure with interconnected top, bottom, left, and right rear tripods. The shape is relatively regular, and the force is transmitted more evenly when under stress, making the frame structure behind the center tube more stable and further enhancing its load-bearing capacity.

[0010] As a preferred embodiment of this utility model, the rear beam tube, left lower fork, right lower fork, and center tube of the frame are made of tubing with similar circumferences. "Similar circumferences" in this embodiment means that the diameter difference between these components is within 5 millimeters, and their circumferences are relatively close to or equal. Under such circumstances, the force that each component can bear and transmit is basically the same, and there are no weak points.

[0011] The beneficial effects of this utility model are as follows: By welding the upper ends of the left and right upper forks to the center tube, and connecting the lower ends of the left and right upper forks to their corresponding left and right claw hooks, the upper ends of the left and right lower forks intersect and are welded to the lower side of one end of the rear beam tube and the rear side of the folding box. The front side of the folding box is connected to the front beam tube. The lower ends of the left and right lower forks are connected to their corresponding left and right claw hooks. The bottom corners of the left and right lower forks are welded to the upper side of the bottom bracket. The left and right lower forks are welded to both sides of the center tube. This creates a triangular pyramid or multi-faceted pyramid structure between the rear beam tube, center tube, left lower fork, and right lower fork. Furthermore, the use of tubing with similar circumferences for the rear beam tube, left lower fork, right lower fork, and center tube ensures more even stress distribution in the load-bearing triangular area of ​​the frame. This results in a more robust and stronger overall frame that will not loosen under external force, providing good safety and relatively even stress distribution.

[0012] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 yes Figure 1 Side view of the structure.

[0015] Figure 3 This is a schematic diagram of a connection structure between a five-way connector and a rear beam pipe according to this utility model.

[0016] Figure 4 This is another three-dimensional structural schematic diagram of the present invention.

[0017] Figure 5 yes Figure 4 Side view of the structure.

[0018] Figure 6 This is a schematic diagram of another connection structure between the five-way connector and the rear beam pipe of this utility model.

[0019] In the diagram: 1-Left upper fork, 2-Right upper fork, 3-Left claw hook, 4-Right claw hook, 5-Side tube, 6-Left lower fork, 7-Right lower fork, 8-Bottom tube, 9-Rear frame tube, 10-Front crossbeam, 11-Folding box, 12-Reinforcing tube, 13-Single reinforcing tube, 14-Reinforcing plate, 15-Arc-shaped reinforcing plate. Detailed Implementation

[0020] See Figures 1-6 This utility model provides the following technical solution:

[0021] A folding bicycle frame with a full triangular pyramid structure includes a left upper fork 1, a right upper fork 2, a left pawl hook 3, a right pawl hook 4, a center tube 5, a left lower fork 6, a right lower fork 7, a bottom bracket 8, a rear beam tube 9, a front beam tube 10, and a folding box 11. The upper ends of the left upper fork 1 and the right upper fork 2 are connected to the center tube 5. The lower ends of the left upper fork 1 and the left lower fork 6 are connected to the left pawl hook 3. The lower ends of the right upper fork 2 and the right lower fork 7 are connected to the right pawl hook 4. The left upper fork 1, the left lower fork 6, the left pawl hook 3, and the center tube 5 form the left rear triangle. The right upper fork 2, the right lower fork 7, and the right pawl hook... 4. The middle tube 5 forms the right rear triangle. The rear beam tube 9 of the frame is located above the bottom bracket 8. The middle tube 5 is perpendicular to the bottom bracket 8 and the outer surface of the middle tube 5 is welded to one side of the bottom bracket 8. One end of the middle tube 5 and the rear beam tube 9 are fixedly connected. The other end of the rear beam tube 9 is connected to the rear side of the folding box 11. The front side of the folding box 11 is connected to the front beam tube 10. The left lower fork 6 and the right lower fork 7 are both fixedly welded to the upper side of the bottom bracket 8. The bottom bracket 8 and the rear beam tube 9 are provided with a reinforcing tube 12 near the end of the folding box 11. The reinforcing tube 12, the middle tube 5, and the rear beam tube 9 form the front triangle.

[0022] In one case, such as Figures 1-3 The upper ends of the left lower fork 6 and the right lower fork 7 are connected to the middle tube 5 and then extend towards the rear beam tube 9 near the folding box 11 as a reinforcing tube 12. The upper ends of the left lower fork 6 and the right lower fork 7 intersect and are welded and fixed to the lower side of one end of the rear beam tube 9 and the rear side of the folding box 11. The left lower fork 6 and the right lower fork 7 are welded to both sides of the middle tube 5. The left lower fork 6 and the right lower fork 7 are both corner-shaped. The right upper fork 2 and the left upper fork 1 are symmetrically welded to the middle tube 5.

[0023] In another case, such as Figures 4-6 A hollow tube is provided between the bottom bracket 8 and the rear beam tube 9 near the end of the folding box 11 as a single reinforcing tube 13.

[0024] The positions of the left claw hook 3 and the right claw hook 4 are aligned.

[0025] The lower left fork 6 and the lower right fork 7 are connected by a reinforcing plate. The lower left fork 6, the lower right fork 7 and the middle tube 5 form a bottom triangular area. The upper right fork 2 and the upper left fork 1 are connected by an arc-shaped reinforcing plate. The upper right fork 2, the upper left fork 1 and the middle tube 5 form a top triangular area. The left rear tripod, the right rear tripod, the bottom triangular area and the top triangular area are combined to form a triangular pyramid structure.

[0026] The rear beam tube 9, left bottom fork 6, right bottom fork 7, and center tube 5 of the frame are made of tubing with similar circumferences.

[0027] The working process of this utility model:

[0028] In operation, the fully triangular pyramidal structure of this utility model of a folding bicycle frame allows for the distribution of vertical loads on the left side by the left triangular area formed between the rear beam tube, left lower fork, and center tube when the frame is under stress. The right triangular area formed between the rear beam tube, right lower fork, and center tube can distribute the vertical loads on the right side. The bottom triangular area formed between the left lower fork, right lower fork, and center tube, combined with the left, right, and bottom triangular areas, forms a three-dimensional triangular pyramidal structure. This pyramidal structure enables multi-point stress distribution, effectively handling the load of the entire frame.

[0029] This utility model relates to a folding bicycle frame with a full triangular pyramid structure. The upper ends of the left upper fork 1 and the right upper fork 2 are welded to the center tube. The lower ends of the left upper fork 1 and the right upper fork 2 are respectively connected to the corresponding left claw hook 3 and right claw hook 4. The upper ends of the left lower fork 1 and right lower fork 2 intersect and are welded to the lower side of one end of the rear beam tube 9 and the rear side of the folding box 11. The front side of the folding box 11 is connected to the front beam tube 10. The lower ends of the left lower fork 6 and right lower fork 7 are respectively connected to the corresponding left claw hook 3 and right claw hook 4. The bottom corners of the left lower fork 6 and right lower fork 7 are welded to the upper side of the bottom bracket 8. The left lower fork 6 and right lower fork 7 are welded to both sides of the center tube 5, so that the rear beam tube 9, center tube 5, left lower fork 6, and right lower fork 7 form a triangular pyramid structure or a multi-faceted pyramid structure. Furthermore, the rear beam tube 9, left lower fork 0, right lower fork 1, and center tube 5 use tubes with similar circumferences to ensure that the stress in the load-bearing triangular area of ​​the frame is more even, ensuring the overall frame is robust and strong. The frame will not loosen under external force, has good safety, and the stress is relatively even.

[0030] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A full triangulated pyramid structure folding bicycle frame, characterized by: Includes an upper left fork (1), an upper right fork (2), a left claw hook (3), a right claw hook (4), a middle tube (5), a lower left fork (6), a lower right fork (7), a bottom bracket (8), a rear beam tube (9), a front beam tube (10), and a folding box (11). The upper ends of the upper left fork (1) and the upper right fork (2) are connected to the middle tube (5). The lower ends of the upper left fork (1) and the lower left fork (6) are connected to the left claw hook (3). The lower ends of the upper right fork (2) and the lower right fork (7) are connected to the right claw hook (4). The upper left fork (1), the lower left fork (6), the left claw hook (3), and the middle tube (5) form a left rear triangle. The upper right fork (2), the lower right fork (7), the right claw hook (4), and the middle tube (5) form a... The right rear triangle is formed. The rear beam tube (9) of the frame is located above the bottom bracket (8). The middle tube (5) is perpendicular to the bottom bracket (8) and the outer surface of the middle tube (5) is welded to one side of the bottom bracket (8). One end of the middle tube (5) and the rear beam tube (9) are fixedly connected. The other end of the rear beam tube (9) is connected to the rear side of the folding box (11). The front side of the folding box (11) is connected to the front beam tube (10). The left lower fork (6) and the right lower fork (7) are both fixedly welded to the upper side of the bottom bracket (8). The bottom bracket (8) and the rear beam tube (9) are provided with a reinforcing tube (12) near the end of the folding box (11). The reinforcing tube (12), the middle tube (5), and the rear beam tube (9) form the front triangle.

2. A full triangle, triangular pyramid structure folding bicycle frame according to claim 1, characterized in that: The upper ends of the left lower fork (6) and the right lower fork (7) are connected to the middle tube (5) and extend towards the rear beam tube (9) near the folding box (11) as a reinforcing tube (12). The upper ends of the left lower fork (6) and the right lower fork (7) intersect and are welded and fixed to the lower side of one end of the rear beam tube (9) and the rear side of the folding box (11). The left lower fork (6) and the right lower fork (7) are welded to both sides of the middle tube (5). The left lower fork (6) and the right lower fork (7) are both corner-shaped. The right upper fork (2) and the left upper fork (1) are symmetrically welded to the middle tube (5).

3. The folding bicycle frame with a full triangular pyramid structure as described in claim 1, characterized in that: A hollow tube is provided between the five-way connector (8) and the rear beam tube (9) near the end of the folding box (11) as a single reinforcing tube (13).

4. A full triangulated triangular pyramid structure folding bicycle frame as claimed in claim 1, wherein: The positions of the left claw hook (3) and the right claw hook (4) are aligned with each other.

5. A full triangulated triangular pyramid structure folding bicycle frame as claimed in claim 1, wherein: The lower left fork (6) and the lower right fork (7) are connected by a reinforcing plate. The lower left fork (6), the lower right fork (7) and the middle tube (5) form a bottom triangular area. The upper right fork (2) and the upper left fork (1) are connected by an arc-shaped reinforcing plate. The upper right fork (2), the upper left fork (1) and the middle tube (5) form a top triangular area. The left rear tripod, the right rear tripod, the bottom triangular area and the top triangular area are combined to form a triangular pyramid structure.

6. A full triangulated triangular pyramid structure folding bicycle frame as defined in claim 1, characterized in that: The rear beam tube (9), left lower fork (6), right lower fork (7) and center tube (5) of the frame are made of tubing with similar circumferences.

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