A five-way rotating coupling folding cart

Abstract

This utility model discloses a five-way rotating coupling folding bicycle, including a front frame, a center tube, a rear frame, a switch lock, a bottom bracket tube, and a rotating shaft. The front frame includes an upper crossbeam, a lower crossbeam, a head tube, a fork tube, a fork, and a front wheel. One end of the upper and lower crossbeams is connected to the side of the head tube, and the other end is connected to the side of the center tube. The fork tube passes through the head tube and has folding devices at both ends that connect to the handlebars and the fork. The fork connects to both sides of the front wheel. The rear frame includes a rear upper fork, a rear lower fork, and a rear wheel. One end of the rear upper fork is connected to the center tube via a switch lock, and one end of the rear lower fork is rotatably connected to the lower crossbeam via the rotating shaft. The other ends of the rear upper and lower forks are connected to each other via rear inserts, which are connected to both sides of the rear wheel. This utility model allows the bicycle to be folded without disassembling the frame, and it does not affect the overall strength of the frame.

Description

Technical Field

[0001] This utility model relates to the technical field of bicycle folding frames, and in particular to a five-way rotating coupling folding bicycle. Background Technology

[0002] The top of the bicycle's bottom tube connects to the saddle, and the bottom connects to the pedal axle. The frame between the bottom tube and the front wheel is called the front frame, and the frame between the bottom tube and the rear wheel is called the rear frame. To facilitate carrying and storing bicycles when not in use, foldable bicycles were developed. Typically, the frame crossbeams can be folded, reducing the bicycle's space-consuming nature. However, by breaking down the frame crossbeams to create a foldable frame, its vertical load-bearing capacity is weakened, resulting in a decrease in the overall strength of the frame for riding. Utility Model Content

[0003] The purpose of this invention is to optimize the existing folding bicycle structure and propose a five-way rotary coupling folding bicycle that can fold the bicycle without breaking the frame, without affecting the overall strength of the frame.

[0004] To achieve the above objectives, this utility model proposes a five-way rotating coupling folding bicycle, including a front frame, a center tube, a rear frame, a switch latch, a five-way tube, and a rotating shaft; the front frame includes an upper crossbeam, a lower crossbeam, a head tube, a fork tube, a fork, and a front wheel. One end of the upper and lower crossbeams is connected to the side of the head tube, and the other end is connected to the side of the center tube. The fork tube passes through the head tube and has folding devices at both ends that connect to the handlebars and the fork, respectively. The fork connects to both sides of the front wheel; the rear frame includes a rear upper fork, a rear lower fork, and a rear wheel. One end of the rear upper fork is connected to the center tube via a switch latch. The rear chainstay is rotatably connected to the lower crossbeam via a rotating shaft. The other ends of the rear upper fork and rear chainstay are connected to each other via rear inserts, which are connected to both sides of the rear wheel. The bottom bracket is fixedly connected to the lower crossbeam or rear chainstay, and the axis of the bottom bracket is perpendicular to the axis of the upper crossbeam. The bottom bracket is connected to the pedal assembly, and the bottom tube is connected to the bicycle seat. The angle between the folding mechanism rotation axis, the rotation axis of the rotating shaft, and the axis of the upper crossbeam along its length is less than or greater than 90°. After rotation, the rear frame and front fork are located on both sides of the upper crossbeam, and the handlebars are located above the front fork.

[0005] In this design, the bottom tube, top crossbeam, bottom crossbeam, and head tube are treated as a single unit without any disassembly or folding structure. The rear frame (including the rear fork and rear wheel) is rotatably connected to the aforementioned unit via a rotating shaft, serving as the folding section. The front fork tube and front wheel are the front section. The front fork tube remains stationary, but the handlebars and front wheel connected to it become rotatable folding sections under the action of the folding mechanism. The folding mechanism consists of two rotatably connected parts. One part is fixedly connected to the front fork tube, and the other part is fixedly connected to the handlebars or front fork. By setting the rotation axis of the folding mechanism and the angle between the rotation axis and the length axis of the top crossbeam, the rear frame is positioned on one side of the top crossbeam after rotation and folding, while the front wheel and handlebars are positioned on the other side. The bottom tube, top crossbeam, bottom crossbeam, and head tube, as a single unit, are the main load-bearing structure. Maintaining their integrity ensures that the overall strength is not affected by folding, while the length of the folded bicycle is greatly reduced, making it easy to carry and store.

[0006] In a preferred embodiment of this invention, a center tube connecting tube is provided at the connection between the center tube and the rear frame, and a rear frame connecting tube is provided at the connection between the rear frame and the center tube. The center tube connecting tube and the rear frame connecting tube are connected by a switch lock. In this embodiment, the rear frame rotates around a pivot axis located at the bottom of the rear frame, while the connection between the center tube and the rear frame is located at the top of the rear frame. The center tube connecting tube and the rear frame connecting tube can be sleeve-type tubes, allowing them to separate when the rear frame rotates and then be fixed back together using a switch lock. Although this connection strength may be somewhat affected, the impact on the overall strength of the bicycle is relatively small.

[0007] In a preferred embodiment of this invention, the rotating shaft includes a shaft sleeve, shaft lugs, and a pin. A shaft lug is provided on each of the two lower sides of the rear frame. The shaft sleeve is connected to the lower crossbeam, and the two shaft lugs are respectively close to both sides of the shaft sleeve and rotatably connected to the shaft sleeve via the pin. This design utilizes the pin as the rotating shaft, enabling a rotatable connection between the shaft lugs and the shaft sleeve.

[0008] In a preferred embodiment of this invention, the rotating shaft includes a shaft sleeve, shaft lugs, and a set of locking screws. A shaft lug is located on each of the two lower sides of the rear frame. The shaft sleeve is connected to the lower crossbeam. The two shaft lugs are respectively fitted against both sides of the shaft sleeve and rotatably connected to the shaft sleeve via the locking screws. The locking screws include a first connecting sleeve, a second connecting sleeve, and a fixing bolt. The first and second connecting sleeves pass through the shaft lugs from both sides and extend into the shaft sleeve. The fixing bolt passes through the first or second connecting sleeve and is threadedly fixed to the other connecting sleeve. This design utilizes a set of locking screws as the rotating shaft, with the first and second connecting sleeves rotatably connected to the shaft lugs on both sides.

[0009] In a preferred embodiment of this invention, the bottom bracket is fixedly connected to the lower crossbeam, the rotating shaft is fixedly connected to the center tube and the bottom bracket, and the rotating shaft is rotatably connected to the rear lower fork. In this design, the bottom bracket does not rotate when the rear frame rotates.

[0010] In a preferred embodiment of this invention, the bottom bracket is fixedly connected to the rear chainstay, the rotating shaft is fixedly connected to the lower crossbeam, and the rear chainstay is rotatably connected to the rotating shaft. In this design, the bottom bracket rotates together with the rear frame when the rear frame rotates.

[0011] The beneficial effects of this utility model are: the bicycle can be folded without changing the frame, and the overall strength of the frame is not affected.

[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 schematic diagram of the overall structure of a vehicle frame according to this utility model.

[0014] Figure 2 yes Figure 1 A schematic diagram of a folded frame structure.

[0015] Figure 3 yes Figure 1 An exploded view of a vehicle frame structure.

[0016] Figure 4 Is adopted Figure 1 A schematic diagram of a folding bicycle frame.

[0017] Figure 5 yes Figure 4 A schematic diagram of the folded structure of a folding bicycle.

[0018] Figure 6 This is a schematic diagram of another overall frame structure of this utility model.

[0019] Figure 7 yes Figure 6 An exploded view of a vehicle frame structure.

[0020] Figure 8 Is adopted Figure 6 A schematic diagram of the folded structure of a folding bicycle frame.

[0021] In the diagram: 1-Front frame, 2-Side tube, 3-Rear frame, 4-Switch lock, 5-Bottom tube, 6-Swivel shaft, 7-Upper crossbeam, 8-Lower crossbeam, 9-Head tube, 10-Front fork tube, 11-Front fork, 12-Front wheel, 13-Folding mechanism, 14-Handlebar, 15-Rear top fork, 16-Rear bottom fork, 17-Rear wheel, 18-Rear insert, 19-Side tube connecting tube, 20-Rear frame connecting tube, 61-Shaft sleeve, 62-Shaft lug, 63-Pin, 64-First connecting sleeve, 65-Second connecting sleeve, 66-Fixing bolt. Detailed Implementation

[0022] See Figures 1-8 This utility model provides the following technical solution:

[0023] A five-way swivel coupling folding bicycle includes a front frame 1, a center tube 2, a rear frame 3, a switch lock 4, a five-way tube 5, and a swivel shaft 6. The front frame 1 includes an upper crossbeam 7, a lower crossbeam 8, a head tube 9, a front fork tube 10, a front fork 11, and a front wheel 12. One end of the upper crossbeam 7 and the lower crossbeam 8 is connected to the side of the head tube 9, and the other end is connected to the side of the center tube 2. The front fork tube 10 passes through the head tube 9 and has folding devices 13 at both ends that connect to the handlebars 14 and the front fork 11, respectively. The front fork 11 is connected to both sides of the front wheel 12. The rear frame 3 includes a rear upper fork 15, a rear lower fork 16, and a rear wheel 17. One end of the rear upper fork 15 is connected to the center tube 2 via a switch lock. The rear lower fork 16 is connected to the lower crossbeam 8 via a rotating shaft 6 at one end. The other ends of the rear upper fork 15 and the rear lower fork 16 are connected to each other via a rear insert 18, which is connected to both sides of the rear wheel 17. The bottom bracket 5 is fixedly connected to the lower crossbeam 8 or the rear lower fork 16. The axis of the bottom bracket 5 is perpendicular to the axis of the upper crossbeam 7. The bottom bracket 5 is connected to the pedal assembly. The middle tube 2 is connected to the bicycle seat. The rotation axis of the folding device 13 and the rotation axis of the rotating shaft 6 are at an angle less than or greater than 90° with the length axis of the upper crossbeam 7. After rotation, the rear frame 3 and the front fork 11 are located on both sides of the upper crossbeam 7, and the handlebars 14 are located above the front fork 11 after rotation.

[0024] A middle tube connecting pipe 19 is provided at the connection between the middle tube 2 and the rear frame 3, and a rear frame connecting pipe 20 is provided at the connection between the rear frame 3 and the middle tube 2. The middle tube connecting pipe 19 and the rear frame connecting pipe 20 are connected by a switch latch 4.

[0025] like Figure 7 As shown, the rotating shaft 6 includes a shaft cylinder 61, a shaft lug 62, and a pin 63. A shaft lug 62 is provided on each of the two lower sides of the rear frame 3. The shaft cylinder 61 is connected to the lower crossbeam 8. The two shaft lugs 62 are respectively close to both sides of the shaft cylinder 61 and are rotatably connected to the shaft cylinder 61 through the pin 63.

[0026] like Figure 3As shown, the rotating shaft 6 includes a shaft sleeve 61, a shaft lug 62, and a set of male and female locking screws. A shaft lug 62 is provided on each of the two sides of the lower side of the rear frame 3. The shaft sleeve 61 is connected to the lower crossbeam 8. The two shaft lugs 62 are respectively close to both sides of the shaft sleeve 61 and are rotatably connected to the shaft sleeve 61 by the male and female locking screws. The male and female locking screws include a first connecting sleeve 64, a second connecting sleeve 65, and a fixing bolt 66. The first connecting sleeve 64 and the second connecting sleeve 65 pass through the shaft lug 62 from both sides and extend into the shaft sleeve 61. The fixing bolt 66 passes through the first connecting sleeve 64 or the second connecting sleeve 65 and is threadedly fixed to the other connecting sleeve.

[0027] like Figure 6 , Figure 7 As shown, the five-way pipe 5 is connected and fixed to the lower crossbeam 8, the rotating shaft 6 is connected and fixed to the middle pipe 2 and the five-way pipe 5, and the rotating shaft 6 is rotatably connected to the rear lower fork 16.

[0028] like Figure 1 , Figure 2 , Figure 3 As shown, the bottom bracket 5 is connected and fixed to the rear lower fork 16, the rotating shaft 6 is connected and fixed to the lower crossbeam 8, and the rear lower fork 16 is rotatably connected to the rotating shaft 6.

[0029] The working process of this utility model:

[0030] The middle tube 2, upper crossbeam 7, lower crossbeam 8, and head tube 9 are considered as a whole, without any disassembly or folding structure. The rear frame 3, as the rear part of the vehicle, is rotatably connected to the aforementioned whole via a rotating shaft 6 as a folding part. The front fork tube 10 and the front wheel 12 are the front part of the vehicle. The front fork tube 10 remains stationary, but the handlebars 14 and the front wheel 12 connected to the front fork tube 10 are rotatably folding parts. By setting the angle between the rotation axis of the folding device 13, the rotation axis of the rotating shaft 6, and the length axis of the upper crossbeam 7, the rear frame 3 is located on one side of the upper crossbeam 7 after being rotated and folded, while the front wheel 12 and the handlebars 14 are located on the other side of the upper crossbeam 7 after being rotated and folded.

[0031] 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 five-way rotary coupling folding cart, characterized in that: Includes front frame, center tube, rear frame, switch latches, bottom bracket, and swivel shaft; The front frame includes an upper crossbeam, a lower crossbeam, a head tube, a fork tube, a fork, and a front wheel. One end of the upper crossbeam and the lower crossbeam are connected to the side of the head tube, and the other end is connected to the side of the center tube. The fork tube passes through the head tube and has folding devices at both ends that connect to the handlebars and the fork, respectively. The fork connects to both sides of the front wheel. The rear frame includes a rear upper fork, a rear lower fork, and a rear wheel. One end of the rear upper fork is connected to the center tube via a switch lock, and one end of the rear lower fork is rotatably connected to the lower crossbeam via a rotating shaft. The other ends of the rear upper fork and the rear lower fork are connected to each other via rear inserts, and the rear inserts are connected to both sides of the rear wheel. The bottom bracket is connected and fixed to the lower crossbeam or rear lower fork, the axis of the bottom bracket is perpendicular to the axis of the upper crossbeam, the bottom bracket is connected to the pedal device, and the middle tube is connected to the bicycle seat. The angle between the rotation axis of the folding device, the rotation axis of the rotating shaft and the axis of the upper crossbeam is less than or greater than 90°. After rotation, the rear frame and the front fork are located on both sides of the upper crossbeam, and the handlebars are located above the front fork.

2. The five-way rotary coupling folding cart as described in claim 1, characterized in that: The connection between the center tube and the rear frame is provided with a center tube connecting pipe, and the connection between the rear frame and the center tube is provided with a rear frame connecting pipe. The center tube connecting pipe and the rear frame connecting pipe are connected by a switch and latch.

3. A five-way rotary coupling folding cart as described in claim 1, characterized in that: The rotating shaft includes a shaft cylinder, shaft lugs, and pins. A shaft lug is provided on each of the two lower sides of the rear frame. The shaft cylinder is connected to the lower crossbeam. The two shaft lugs are respectively close to both sides of the shaft cylinder and are rotatably connected to the shaft cylinder through pins.

4. A five-way rotary coupling folding cart as described in claim 1, characterized in that: The rotating shaft includes a shaft sleeve, shaft lugs, and a set of male and female locking screws. A shaft lug is provided on each of the two lower sides of the rear frame. The shaft sleeve is connected to the lower crossbeam. The two shaft lugs are respectively close to both sides of the shaft sleeve and are rotatably connected to the shaft sleeve by the male and female locking screws. The male and female locking screws include a first connecting sleeve, a second connecting sleeve, and a fixing bolt. The first connecting sleeve and the second connecting sleeve pass through the shaft lugs from both sides and extend into the shaft sleeve. The fixing bolt passes through the first connecting sleeve or the second connecting sleeve and is threadedly fixed to the other connecting sleeve.

5. A five-way rotary coupling folding cart as described in claim 1, characterized in that: The five-way pipe is fixedly connected to the lower crossbeam, the rotating shaft is fixedly connected to the middle pipe and the five-way pipe, and the rotating shaft is rotatably connected to the rear lower fork.

6. A five-way rotary coupling folding cart as described in claim 1, characterized in that: The five-way pipe is fixedly connected to the rear lower fork, the rotating shaft is fixedly connected to the lower crossbeam, and the rear lower fork is rotatably connected to the rotating shaft.

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