A bicycle folder

Abstract

This invention provides a bicycle folding mechanism, belonging to the technical field of bicycle folding mechanism technology. It includes a central tube and two folding tubes rotatably connected to both ends of the central tube via connecting components. The two folding tubes and the central tube together form the folding portion of the frame. In the folded state, the two folding tubes are located on both sides of the central tube and are parallel to it. A limiting component is installed on the central tube to simultaneously limit the two folding tubes when they are coaxial or parallel to the central tube. By setting the limiting component, this invention allows for simultaneous limiting of the two rotatable connection points of the frame when the folding tubes are coaxial with the central tube during the bicycle unfolding process. This facilitates stable unfolding of the frame, reduces the difficulty and time required for unfolding, and ensures the stability of the frame in the folded state by simultaneously limiting the two rotatable connection points of the frame when the two folding tubes are parallel to the central tube.

Description

Technical Field

[0001] This invention relates to the field of bicycle folding mechanism technology, and particularly to a bicycle folding mechanism. Background Technology

[0002] Bicycles are mainly divided into two types based on their folding method: horizontal folding and vertical folding. Each type has its advantages and disadvantages. Horizontal folding has a simple structure, but the folded size is not very compact. Vertical folding has a slightly more complex mechanism, but the folded size is more compact, often having an advantage in length, width, and height. However, regardless of whether the bicycle folds horizontally or vertically, the front and rear wheels are not parallel after folding, making it impossible to push the bicycle directly using only two wheels. Most bicycles can only be pushed short distances by lifting one wheel and relying on the other wheel to touch the ground, which is very inconvenient. Therefore, Chinese Patent CN220865572U discloses a folding bicycle. This folding bicycle uses two hinges on the frame, which can be rotated and combined to form parallel folding of the front and rear wheels. This allows for pushing the bicycle using only two wheels after folding, and the front and rear wheels are coaxial after folding. It also minimizes the folded size, makes full use of space, has a simple structure, and is convenient to fold.

[0003] While the aforementioned device achieves parallel folding of the front and rear wheels of a bicycle by setting two hinges, making it easier to push the folded bicycle, it also increases the rotational freedom during the folding and unfolding process. That is, compared to a bicycle whose frame only folds once, using this folding device makes it easier for the folded part of the frame to move relative to the frame during the unfolding or folding process. At the same time, the two folding mechanisms of the frame are separate from each other, which means that during the unfolding process, the two hinge positions need to be fixed one by one. Due to the unevenness of the bicycle's external structure, especially when the bicycle is supported by the tires, the other hinge position is prone to wobbling due to unstable support during the locking of the current hinge position, which is not conducive to the stable unfolding operation of the frame and increases the difficulty and time required for unfolding the frame. Therefore, this application provides a bicycle folding device to meet the needs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a bicycle folding device to solve the problem that when the front and rear wheels of a bicycle are folded in parallel by setting two hinges, it is not conducive to the stable unfolding operation of the frame, which easily increases the difficulty and time of unfolding the frame.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A bicycle folding device includes a middle tube and two folding tubes rotatably connected to both ends of the middle tube via connecting components. The two folding tubes and the middle tube together form the folding part of the frame. In the folded state, the two folding tubes are located on both sides of the middle tube and are parallel to the middle tube. The middle tube is equipped with a limiting component for synchronously limiting the two folding tubes when they are coaxial or parallel to the middle tube.

[0006] Preferably, the connecting component includes two first connecting sleeves installed at both ends of the intermediate tube. The first connecting sleeves are rotatably connected to a second connecting sleeve via connecting lugs and connecting shafts. The second connecting sleeve is installed at the end of the folded tube near the intermediate tube. The connecting lugs and connecting shafts on the two first connecting sleeves are symmetrically arranged about the center of the intermediate tube. The limiting component includes a limiting insert that slides through the first connecting sleeve and is fitted with the inner hole of the second connecting sleeve. The limiting insert slides along the axial direction of the intermediate tube. A fifth guiding slope, symmetrical about the center of the intermediate tube, is provided on the side of the two limiting inserts that are far apart from each other. The side of the limiting insert near the connecting shaft is longer than the side of the limiting insert far from the connecting shaft.

[0007] Preferably, the intermediate tube is provided with two positioning sleeves that penetrate and extend into the intermediate tube. The two positioning sleeves are symmetrical about the center of the intermediate tube. In the folded state, a positioning hole is opened on the side of the folded tube closest to the intermediate tube. The limiting component includes a limiting pin that slides through the positioning sleeve and is adapted to the positioning hole. A connecting plate is installed at the end of each of the two limiting tubes that are close to each other. The two connecting plates are located at the end of each of the two second connecting sleeves that are close to each other. A spring that abuts against the second connecting sleeve is installed on the connecting plate. The spring is sleeved on the limiting tube. A first adjusting plate is installed at the end of the connecting plate away from the limiting tube. The intermediate tube slides... Two second adjusting plates are fitted together and extend into the middle tube. The second adjusting plates have connecting holes that penetrate the second adjusting plates. A threaded sleeve is installed on the middle tube and extends into the middle tube. An adjusting bolt that penetrates the threaded sleeve is fitted inside the threaded sleeve. A stop is fitted outside the adjusting bolt. Adjusting rods are connected to both sides of the stop. The adjusting rods are adapted to the connecting holes and pass through the two connecting holes. An adjusting handle is installed on the top of the adjusting bolt. The bottom of the adjusting bolt is provided with a first limiting thread that is adapted to the internal thread of the threaded sleeve. The top of the adjusting bolt is provided with a second limiting thread that is adapted to the internal thread of the threaded sleeve. There is a gap between the first limiting thread and the second limiting thread.

[0008] Preferably, the limiting pin has a first and a second sliding groove that are perpendicular to and pass through each other. A second guide slope is formed on one inner wall of the first sliding groove, and a third guide slope is formed on the inner wall of the second sliding groove away from the second guide slope. A first guide slope adapted to the second guide slope is formed on the first adjusting plate, and a fourth guide slope adapted to the third guide slope is formed on the second adjusting plate. The two limiting tubes, the two first adjusting plates, the two limiting pins, and the two second guide slopes are all symmetrically arranged about the center of the middle tube. In the folded state, the spring, through its own elasticity, causes the limiting tube to fully retract into the middle tube. The limiting tube, through the cooperation of the first and second guide slopes on the first adjusting plate, drives one end of the limiting pin to slide outside the middle tube and remain inserted into the positioning hole. During unfolding, the second adjusting plate moves downwards and, through the cooperation of the fourth and third guide slopes, drives the limiting pin to retract into the middle tube. The cooperation of the second and first guide slopes also drives the limiting tube to slide out of the middle tube.

[0009] Preferably, the top of the abutment is provided with several limiting slots evenly distributed around its perimeter, and the bottom of the adjusting handle is provided with one or more limiting blocks that are adapted to the limiting slots.

[0010] Preferably, a stop ring is installed at the bottom of the adjusting handle, and the stop ring abuts against the top of the stop seat.

[0011] Preferably, a relief groove is provided on the side of the first adjusting plate away from the first guide slope, and the two first adjusting plates can be staggered on the same horizontal plane through the relief groove.

[0012] Preferably, the side of the first adjusting plate with the recessed groove is in contact with the vertical side of the second adjusting plate near the first adjusting plate.

[0013] Preferably, the threaded sleeve is located at the top of the intermediate tube, and the axis of the threaded sleeve is perpendicular to and does not intersect with the axis of the positioning sleeve.

[0014] Preferably, a connecting block perpendicular to the axis of the connecting shaft is installed on the side of the first connecting sleeve that abuts against the second connecting sleeve, and a connecting slot adapted to the connecting block is provided on the side of the second connecting sleeve that abuts against the first connecting sleeve.

[0015] Preferably, a separator pad is installed on the side of the second connecting sleeve that abuts against the first connecting sleeve, and the separator pad is located outside the connecting slot.

[0016] Preferably, in the unfolded state, the limiting tube is simultaneously inserted into the first connecting sleeve and the second connecting sleeve, and the inner wall of the limiting tube at the joint of the first connecting sleeve and the second connecting sleeve is thickened and provided with a support wall perpendicular to the axis of the limiting tube.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: In the above solution, by setting a limiting component, when the folding tube and the middle tube are coaxial during the unfolding process of the bicycle, the limiting component can be directly operated to simultaneously limit the two rotating connection positions of the frame, which is conducive to the stable unfolding operation of the frame and reduces the difficulty and time of unfolding the frame. Correspondingly, when the two folding tubes are parallel to the middle tube, the limiting component can be used to simultaneously limit the two rotating connection positions of the frame to ensure the stability of the frame in the folded state.

[0018] By setting up connecting and limiting components, in the unfolded state, the second limiting thread is threadedly connected to the threaded sleeve. The adjusting bolt presses down on the seat through the adjusting handle and drives the two second adjusting plates to press down on the third guide slope through the adjusting rod, causing the limiting pin to retract into the middle tube along the axis of the positioning sleeve. During this process, the second guide slope squeezes the first guide slope, driving the first adjusting plate to move outward along the axis of the middle tube. The two limiting inserts moving outward are respectively inserted into the two first connecting sleeves and the second connecting sleeve, completing the limiting of the middle tube and the folding tube in the unfolded state. When folding the middle tube and the folding tube, the adjusting handle is rotated in the opposite direction. The adjusting handle drives the second limiting thread to rotate through the adjusting bolt. When the second limiting thread disengages from the threaded sleeve, under the elastic force of the spring, the connecting plate drives the limiting pin to rotate. The insertion tube is reset, and the reset limiting insertion tube is retracted into the intermediate tube. At the same time, the limiting insertion tube also drives the connecting plate and the first adjusting plate to move synchronously. The first adjusting plate presses the second guiding inclined surface through the first guiding inclined surface, so that the limiting pin slides out of the intermediate tube along the axis of the positioning sleeve. At this time, the first and second connecting sleeves that are in contact open, and the two folding tubes are rotated to be parallel to the intermediate tube. During this process, the folding tubes gradually approach the limiting pin until they contact and press the limiting pin. The limiting pin is forced to retract into the intermediate tube. When the folding tubes are parallel to the intermediate tube, under the action of the spring force, the limiting pin pops out and locks into the positioning hole, completing the limiting of the folded state of the intermediate tube and the folding tubes, improving the convenience of the folding operation of the intermediate tube and the folding tubes, as well as the stability of the posture after folding.

[0019] When it is necessary to unfold the intermediate tube and the folded tube, press down the adjusting handle until the second limit thread contacts the threaded sleeve and stop. The descending adjusting handle, through the contact drive, causes the adjusting rod connected to the abutment to move the second adjusting plate down. The contact between the fourth and third guide slopes on the second adjusting plate causes the limit pin to retract into the intermediate tube, thereby releasing the insertion relationship between the limit pin and the positioning hole. After releasing the pressure on the adjusting handle, rotate the folded tube until it is coaxial with the intermediate tube. Then, press down the adjusting handle until the second limit thread contacts the threaded sleeve and rotate the adjusting handle to continue descending the adjusting bolt. The descending adjusting handle, through the contact drive, causes the adjusting rod connected to the abutment to move... The second adjusting plate descends, and the fourth and third guide slopes on the second adjusting plate abut against each other, causing the limiting pin to slide along the axis of the positioning sleeve into the middle tube. The sliding limiting pin abuts against the first guide slope through the second guide slope, causing the first adjusting plate to move. The first adjusting plate drives the limiting tube to continue moving out of the middle tube through the connecting plate until the limiting tube is simultaneously inserted into the first and second connecting sleeves, thus completing the unfolding of the middle tube and the folding tube. By having two limiting tubes simultaneously inserted into the two first and second connecting sleeves, the stability of the frame unfolding operation is improved, and the difficulty and time of unfolding the frame are reduced.

[0020] By setting a fifth guide slope, even if the first and second connecting sleeves are not fully aligned during the unfolding process, the fifth guide slope can automatically align the first and second connecting sleeves during the unfolding of the middle tube and folding tube by contacting and guiding the edge of the inner hole of the second connecting sleeve. This improves the fault tolerance of the frame unfolding operation and reduces the difficulty and time consumption of frame unfolding.

[0021] By incorporating connecting and limiting components, this device can be easily disassembled during maintenance by simply removing the bolts securing the first and second connecting sleeves using specific tools. Then, sliding the limiting inserts towards both ends of the intermediate tube allows the limiting inserts, connecting plates, springs, and the first adjusting plate to be pulled out of the intermediate tube. Reversing the adjustment handle until the second limiting thread disengages from the threaded sleeve, pulling the adjustment handle upwards, and continuing to reverse the adjustment handle until the adjusting pin can be dislodged from the threaded sleeve allows the second adjusting plate to be removed from the intermediate tube. Sliding the second adjusting plate towards both ends along the axis of the adjusting rod removes the second adjusting plate from the adjusting rod. Finally, rotating the intermediate tube along its axis allows the limiting pin to be emptied under gravity. All parts are designed to be detachable, allowing for the replacement of damaged components, extending the service life of undamaged parts, and reducing the operating cost of the device.

[0022] By setting up connecting components, since the adjustment activities of the first adjusting plate, the limiting pin, and the second adjusting plate are mostly completed inside the intermediate tube, they are not easily affected by the external environment, effectively improving the service life of the connecting components. Furthermore, solid components are fitted onto the opening positions on the intermediate tube to prevent deformation caused by stress at the opening positions and to ensure the structural strength of the intermediate tube.

[0023] When the adjusting handle is rotated to drive the adjusting bolt to rotate and achieve the threaded engagement of the threaded sleeve and the second limiting thread, the two ends of the adjusting handle can be bent to avoid interference between the limiting block and the abutment during the adjustment handle rotation. After the adjusting bolt is adjusted, the bending of the two ends of the adjusting handle can be canceled, and the adjusting handle can be rotated until the limiting block engages with the limiting slot under the elastic force of the adjusting handle itself. This avoids the second limiting thread from loosening due to vibration generated during vehicle riding, ensuring the limiting stability of the middle tube and the folding tube. Furthermore, after the adjusting handle is adjusted, the cup can be placed inside the adjusting handle. In this state, the deformation resistance of the adjusting handle in the length direction is stronger, preventing the position of the adjusting handle where the limiting block is installed from warping upward due to vehicle vibration, and ensuring the engagement stability of the limiting block and the limiting slot. Attached Figure Description

[0024] Figure 1 A three-dimensional structural diagram of a bicycle folding mechanism in its unfolded state; Figure 2 A three-dimensional structural diagram of the assembled intermediate tube and limiting components; Figure 3 A three-dimensional structural diagram of the assembled folded tube and connecting components; Figure 4 A partial cross-sectional three-dimensional structural diagram of the assembled intermediate tube and limiting components; Figure 5 A top view of the structure after the intermediate tube and limiting components have been assembled and the adjusting handle and adjusting bolt have been removed. Figure 6 A schematic diagram of the three-dimensional structure after the adjustment handle and adjustment bolt are assembled; Figure 7 A three-dimensional structural diagram of the limiting component after removing the adjusting handle, adjusting bolt, and adjusting rod; Figure 8 This is a schematic diagram of the three-dimensional structure of the limiting pin.

[0025] Figure Labels 1. Intermediate tube; 2. Folded tube; 3. Connecting component; 4. Limiting component; 5. First connecting sleeve; 6. Second connecting sleeve; 7. Limiting insert; 8. Connecting plate; 9. Spring; 10. First adjusting plate; 11. First guide slope; 12. Relief groove; 13. Positioning sleeve; 14. Limiting pin; 15. First sliding groove; 16. Second sliding groove; 17. Second guide slope; 18. Third guide slope; 19. Second adjusting plate 20. Fourth guide slope; 21. Connecting hole; 22. Threaded sleeve; 23. Adjusting bolt; 24. First limit thread; 25. Second limit thread; 26. Adjusting handle; 27. Abutment; 28. Adjusting rod; 29. ​​Limiting slot; 30. Limiting block; 31. Abutment ring; 32. Connecting block; 33. Connecting slot; 34. Connecting ear; 35. Connecting shaft; 36. Fifth guide slope; 37. Positioning hole; 38. Separator.

[0026] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0027] The bicycle folding device provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0028] like Figure 1 As shown, an embodiment of the present invention provides a bicycle folding device, including a middle tube 1 and two folding tubes 2 rotatably connected to both ends of the middle tube 1 by a connecting component 3. The two folding tubes 2 and the middle tube 1 together form the folding part of the frame. In the folded state, the two folding tubes 2 are located on both sides of the middle tube 1 and are parallel to the middle tube 1. A limiting component 4 is installed on the middle tube 1 for synchronously limiting the two folding tubes 2 when they are coaxial or parallel to the middle tube 1.

[0029] By setting the limiting component 4, when the folding tube 2 and the middle tube 1 are coaxial during the unfolding process of the bicycle, the limiting component 4 can be directly operated to synchronously limit the two rotating connection positions of the frame, which is conducive to the stable unfolding operation of the frame and reduces the difficulty and time of unfolding the frame. Correspondingly, when the two folding tubes 2 are parallel to the middle tube 1, the limiting component 4 can be used to synchronously limit the two rotating connection positions of the frame to ensure the stability of the frame in the folded state.

[0030] like Figures 1-8As shown, in this embodiment, the connecting component 3 includes two first connecting sleeves 5 installed at both ends of the intermediate tube 1. The first connecting sleeves 5 are rotatably connected to a second connecting sleeve 6 via connecting lugs 34 and connecting shafts 35. The first connecting sleeves 5 and the second connecting sleeve 6 can be detachably connected to the intermediate tube 1 and the folded tube 2 respectively by bolts. The second connecting sleeve 6 is installed at the end of the folded tube 2 near the intermediate tube 1. The connecting lugs 34 and connecting shafts 35 on the two first connecting sleeves 5 are symmetrically arranged about the center of the intermediate tube 1. The limiting component 4 includes a limiting insert 7 that slides through the first connecting sleeves 5 and is fitted into the first connecting sleeves 5. The limiting insert 7 is adapted to the inner hole of the second connecting sleeve 6. The limiting insertion tube 7 slides axially along the intermediate tube 1. A fifth guide slope 36, symmetrical about the center of the middle tube 1, is provided on the side of the two limiting insertion tubes 7 that are far apart from each other. The side of the limiting insertion tube 7 near the connecting shaft 35 is longer than the side of the limiting insertion tube 7 far from the connecting shaft 35. Two positioning sleeves 13 are provided on the intermediate tube 1, penetrating and extending into the intermediate tube 1. The two positioning sleeves 13 are symmetrical about the center of the middle tube 1. In the folded state, a positioning hole 37 is provided on the side of the folded tube 2 near the intermediate tube 1. The limiting component 4 includes a limiting pin 14 that slides and penetrates the positioning sleeve 13. The limiting pin 14 is adapted to the positioning hole 37. The two limiting insertion tubes... 7. Connecting plates 8 are installed at the ends of the two second connecting sleeves 6 that are close to each other. The two connecting plates 8 are located at the ends of the two second connecting sleeves 6 that are close to each other. A spring 9 is installed on the connecting plate 8 that abuts against the second connecting sleeve 6. The spring 9 is sleeved on the limiting insertion tube 7. A first adjusting plate 10 is installed at the end of the connecting plate 8 that is away from the limiting insertion tube 7. Two second adjusting plates 19 are slidably sleeved on the intermediate tube 1 and extend into the intermediate tube 1. A connecting hole 21 is opened on the second adjusting plate 19. A threaded sleeve 22 is installed on the intermediate tube 1 and extends into the intermediate tube 1. An adjusting bolt 23 is sleeved inside the threaded sleeve 22 and extends through the threaded sleeve 22. An abutting bolt 23 is sleeved on the outside of the adjusting bolt 23. The seat 27 has adjusting rods 28 connected to both sides. The adjusting rods 28 are adapted to the connecting holes 21 and pass through the two connecting holes 21. The top of the adjusting bolt 23 is equipped with an adjusting handle 26. The cross-section of the adjusting handle 26 is I-shaped. The four ends of the adjusting handle 26 are bent upward into an arc shape. The arc shape is the dominant arc with respect to the central angle. The advantage of this design is that the adjusting handle 26 can be used as a cup holder, which improves the utilization rate of the adjusting handle 26. The bottom of the adjusting bolt 23 is provided with a first limiting thread 24 that is adapted to the internal thread of the threaded sleeve 22. The top of the adjusting bolt 23 is provided with a second limiting thread 25 that is adapted to the internal thread of the threaded sleeve 22. The first limiting thread 24 and the second limiting thread 25 are not connected.The limiting pin 14 has a first groove 15 and a second groove 16 that are perpendicular to and pass through each other. A second guide slope 17 is formed on one inner wall of the first groove 15, and a third guide slope 18 is formed on the inner wall of the second groove 16 away from the second guide slope 17. A first guide slope 11 that matches the second guide slope 17 is formed on the first adjusting plate 10, and a fourth guide slope 20 that matches the third guide slope 18 is formed on the second adjusting plate 19. The two limiting tubes 7, the two first adjusting plates 10, the two limiting pins 14, and the two second guide slopes 17 are all located at the middle of the intermediate tube 1. The device is centrally symmetrically arranged. In the folded state, the spring 9, through its own elastic force, causes the limiting insertion tube 7 to fully retract into the middle tube 1. The limiting insertion tube 7, through the cooperation of the first guide slope 11 and the second guide slope 17 on the first adjusting plate 10, drives one end of the limiting pin 14 to slide outside the middle tube 1 and remain inserted into the positioning hole 37. During the unfolding process, the second adjusting plate 19 moves downward and, through the cooperation of the fourth guide slope 20 and the third guide slope 18, drives the limiting pin 14 to retract into the middle tube 1. Furthermore, through the cooperation of the second guide slope 17 and the first guide slope 11, it drives the limiting insertion tube 7 to slide out of the middle tube 1.

[0031] By setting the connecting component 3 and the limiting component 4, in the unfolded state, the second limiting thread 25 is threadedly connected to the threaded sleeve 22. The adjusting bolt 23 presses down on the seat 27 through the adjusting handle 26 and drives the two second adjusting plates 19 to press down on the third guide slope 18 through the adjusting rod 28, so that the limiting pin 14 retracts into the middle tube 1 along the axis of the positioning sleeve 13. During this process, the second guide slope 17 squeezes the first guide slope 11, driving the first adjusting plate 10 to move outward along the axis of the middle tube 1. The two limiting inserts 7 moving outward of the middle tube 1 are respectively inserted into the two first connecting sleeves 5 and the second connecting sleeve 6, completing the limiting of the middle tube 1 and the folding tube 2 in the unfolded state. When the middle tube 1 and the folding tube 2 are folded, the adjusting handle 26 is rotated in the opposite direction. The adjusting handle 26 drives the second limiting thread 25 to rotate through the adjusting bolt 23. When the second limiting thread 25 disengages from the threaded sleeve 22, under the elastic force of the spring 9, the connecting plate 8 drives the limiting tube 7 to reset, and the reset limiting tube 7 is retracted into the intermediate tube 1. At the same time, the limiting tube 7 also drives the connecting plate 8 and the first adjusting plate 10 to move synchronously. The first adjusting plate 10 presses the second guiding inclined surface 17 through the first guiding inclined surface 11, so that the limiting pin 14 slides outward along the axis of the positioning sleeve 13 towards the intermediate tube 1. At this time, the first connecting sleeve 5 and the second connecting sleeve 6 that are in contact are opened, and the two folding tubes 2 are rotated to be parallel to the intermediate tube 1. During this process, the folding tube 2 gradually approaches the limiting pin 14 until it contacts and presses the limiting pin 14. The limiting pin 14 is forced to retract into the intermediate tube 1. When the folding tube 2 is parallel to the intermediate tube 1, under the elastic force of the spring 9, the limiting pin 14 pops out and is locked into the positioning hole 37, completing the limiting of the folded state of the intermediate tube 1 and the folding tube 2, improving the convenience of the folding operation of the intermediate tube 1 and the folding tube 2, as well as the stability of the posture after folding.

[0032] When it is necessary to unfold the intermediate tube 1 and the folded tube 2, the adjustment handle 26 is pressed down until the second limit thread 25 contacts the threaded sleeve 22 and stops. The descending adjustment handle 26 drives the adjustment rod 28 connected to the abutment 27 to descend, thereby lowering the second adjustment plate 19. The fourth guide slope 20 and the third guide slope 18 on the second adjustment plate 19 drive the limit pin 14 to retract into the intermediate tube 1, thereby releasing the insertion relationship between the limit pin 14 and the positioning hole 37. After releasing the pressure on the adjustment handle 26, the folded tube 2 is rotated to be coaxial with the intermediate tube 1. Then, the adjustment handle 26 is pressed down until the second limit thread 25 contacts the threaded sleeve 22 and the adjustment handle 26 is rotated to make the adjustment bolt 23 continue to descend. The descending adjustment handle 26 drives the adjustment rod 28 connected to the abutment 27 to descend. The adjusting rod 28 drives the second adjusting plate 19 to descend, and the fourth guide slope 20 and the third guide slope 18 on the second adjusting plate 19 abut against each other, causing the limiting pin 14 to slide along the axis of the positioning sleeve 13 into the middle tube 1. The sliding limiting pin 14 abuts against the first guide slope 11 through the second guide slope 17, causing the first adjusting plate 10 to move. The first adjusting plate 10 drives the limiting tube 7 to continue moving out of the middle tube 1 through the connecting plate 8, until the limiting tube 7 is simultaneously inserted with the first connecting sleeve 5 and the second connecting sleeve 6, thus completing the unfolding of the middle tube 1 and the folding tube 2. By having two limiting tubes 7 simultaneously inserted with two first connecting sleeves 5 and two second connecting sleeves 6, the stability of the frame unfolding operation is improved, and the difficulty and time of unfolding the frame are reduced.

[0033] Furthermore, by setting a fifth guide slope 36, even if the first connecting sleeve 5 and the second connecting sleeve 6 are not fully aligned during the unfolding process, the fifth guide slope 36 can still drive the first connecting sleeve 5 and the second connecting sleeve 6 to automatically align during the unfolding of the intermediate tube 1 and the folding tube 2 by contacting and guiding the edge of the inner hole of the second connecting sleeve 6. This improves the fault tolerance rate of the frame unfolding operation and reduces the difficulty and time consumption of the frame unfolding.

[0034] By setting up connecting component 3 and limiting component 4, during maintenance, this device can be disassembled simply by removing the bolts used to fix the first connecting sleeve 5 and the second connecting sleeve 6 with a specific tool. Then, the limiting insert 7 can be slid to both ends of the intermediate tube 1 to pull out the limiting insert 7, connecting plate 8, spring 9 and first adjusting plate 10 from the intermediate tube 1. After rotating the adjusting handle 26 in the opposite direction until the second limiting thread 25 disengages from the threaded sleeve 22, pull up the adjusting handle 26 and continue to reverse the adjusting handle 26 until the adjusting bolt 23 can be disengaged from the threaded sleeve 22. Then, the second adjusting plate 19 can be removed from the intermediate tube 1. Then, the second adjusting plate 19 can be removed from the adjusting rod 28 by sliding it to both ends along the axis of the adjusting rod 28. Finally, rotating the intermediate tube 1 along the axis of the intermediate tube 1 will allow the limiting pin 14 to be emptied out under the action of gravity. All parts are designed to be detachable, and damaged parts can be replaced accordingly, which improves the service life of undamaged parts and reduces the operating cost of this device.

[0035] By setting the connecting component 3, since the adjustment activities of the first adjusting plate 10, the limiting pin 14, and the second adjusting plate 19 are mostly completed inside the intermediate tube 1, it is not easily affected by the external environment, which effectively improves the service life of the connecting component 3. Furthermore, the opening positions on the intermediate tube 1 are all fitted with solid components to avoid deformation caused by force at the opening positions and to ensure the structural strength of the intermediate tube 1.

[0036] like Figure 5 and Figure 6 As shown, in this embodiment, the top of the abutment 27 is evenly provided with several limiting slots 29 around its circumference. One or more limiting blocks 30, adapted to the limiting slots 29, are installed at the bottom of the adjusting handle 26. Preferably, there are two limiting blocks 30 symmetrically arranged about the axis of the adjusting bolt 23. The advantage of this arrangement is that when the adjusting handle 26 is rotated to drive the adjusting bolt 23 to rotate and achieve the threaded engagement of the threaded sleeve 22 and the second limiting thread 25, the two ends of the adjusting handle 26 can be bent to avoid interference between the limiting blocks 30 and the abutment 27 during the rotation of the adjusting handle 26. After the adjustment of the adjusting bolt 23 is completed, the adjustment of the adjusting handle can be cancelled. The adjustment handle 26 is bent at both ends and rotated until the limiting block 30 engages with the limiting slot 29 under the elastic force of the adjustment handle 26 itself. This prevents the second limiting thread 25 from loosening due to vibrations generated during vehicle riding, ensuring the limiting stability of the middle tube 1 and the folding tube 2. Furthermore, after adjusting the adjustment handle 26, a cup can be placed inside the adjustment handle 26. In this state, the deformation resistance of the adjustment handle 26 in the length direction is stronger, preventing the position of the adjustment handle 26 where the limiting block 30 is installed from warping upwards due to vehicle vibrations, and ensuring the engagement stability of the limiting block 30 and the limiting slot 29.

[0037] like Figure 5 and Figure 6 As shown, in this embodiment, a retaining ring 31 is installed at the bottom of the adjusting handle 26, and the retaining ring 31 abuts against the top of the retaining seat 27. The advantage of this setting is that when the second limiting thread 25 is threadedly connected to the threaded sleeve 22 through the contact between the retaining ring 31 and the retaining seat 27, the adjusting handle 26 can stably abut against the top of the retaining seat 27 through the contact between the retaining ring 31 and the retaining seat 27, and drive the second adjusting plate 19 to move in a direction perpendicular to the first adjusting plate 10 through the retaining seat 27 and the adjusting rod 28. This avoids the adjusting handle 26 from directly abutting against the retaining seat 27 at the abutting bending position and breaking due to excessive shear force caused by the excessive concentration of the force area, thus ensuring the service life of the adjusting handle 26.

[0038] like Figure 7 As shown, in this embodiment, a relief groove 12 is provided on the side of the first adjusting plate 10 away from the first guide slope 11. The two first adjusting plates 10 can be staggered on the same horizontal plane through the relief groove 12. The advantage of this arrangement is that after the two limiting inserts 7 are retracted into the intermediate tube 1, the two first adjusting plates 10 can be staggered on the same horizontal plane through the relief groove 12, which further improves the structural compactness of the device and improves the space utilization rate in the intermediate tube 1.

[0039] like Figure 7 As shown, in this embodiment, the side of the first adjusting plate 10 with the relief groove 12 is in contact with the vertical side of the second adjusting plate 19 near the first adjusting plate 10. The advantage of this arrangement is that when the limiting pin 14 pushes the first guiding inclined surface 11 through the second guiding inclined surface 17 to drive the first adjusting plate 10 to slide the limiting insertion tube 7 outwards from the middle tube 1, the vertical side of the first adjusting plate 10 supports the side of the first adjusting plate 10 with the relief groove 12, preventing the end of the relief groove 12 away from the connecting plate 8 from being bent by force, thus ensuring the stability of the first adjusting plate 10 in use.

[0040] like Figure 4 As shown, in this embodiment, the threaded sleeve 22 is located at the top of the intermediate tube 1. The axis of the threaded sleeve 22 is perpendicular to and does not intersect with the axis of the positioning sleeve 13. The advantage of this arrangement is that when the frame is folded and unfolded, the adjustment handle 26 is located at the top of the intermediate tube 1, which makes it easy to operate the adjustment bolt 23 through the adjustment handle 26, thereby improving the convenience of the frame unfolding and folding operation.

[0041] like Figure 3 and Figure 4As shown, in this embodiment, a connecting block 32 perpendicular to the axis of the connecting shaft 35 is installed on the side of the first connecting sleeve 5 that abuts against the second connecting sleeve 6. A connecting groove 33 adapted to the connecting block 32 is provided on the side of the second connecting sleeve 6 that abuts against the first connecting sleeve 5. By setting the connecting block 32 and the connecting groove 33 that can be snapped together, the connection strength at the connection position of the first connecting sleeve 5 and the second connecting sleeve 6 is improved, and the shearing force generated by the uneven force at the connection position of the first connecting sleeve 5 and the second connecting sleeve 6 due to the uneven force on the connection position of the folded tube 2 and the intermediate tube 1 is prevented from acting directly on the limiting insertion tube 7, thus ensuring the service life of the limiting insertion tube 7.

[0042] like Figure 3 As shown, in this embodiment, a separator 38 is installed on the side of the second connecting sleeve 6 that abuts against the first connecting sleeve 5. The separator 38 is located outside the connecting slot 33. By setting the separator 38, the contact position of the first connecting sleeve 5 and the second connecting sleeve 6 is isolated, so as to avoid the first connecting sleeve 5 and the second connecting sleeve 6 from directly contacting each other and causing impact or noise, thus ensuring the service life of the first connecting sleeve 5 and the second connecting sleeve 6 and the riding experience of the rider.

[0043] In this embodiment, in the unfolded state, the limiting tube 7 is simultaneously inserted with the first connecting sleeve 5 and the second connecting sleeve 6. The inner wall of the limiting tube 7 at the joint of the first connecting sleeve 5 and the second connecting sleeve 6 is thickened and a support wall perpendicular to the axis of the limiting tube 7 is provided. The advantage of this setting is to improve the structural strength of the limiting tube 7 at the joint of the first connecting sleeve 5 and the second connecting sleeve 6, and to prevent the limiting tube 7 from bending or deforming under the force of the first connecting sleeve 5 and the second connecting sleeve 6, thus ensuring the limiting stability of the intermediate tube 1 and the folding tube 2 in the coaxial state.

[0044] The technical solution provided by this invention, by setting a connecting component 3 and a limiting component 4, in the unfolded state, the second limiting thread 25 is threadedly connected to the threaded sleeve 22. The adjusting bolt 23 presses down on the seat 27 through the adjusting handle 26 and drives the two second adjusting plates 19 to press down on the third guide slope 18 through the adjusting rod 28, so that the limiting pin 14 retracts into the middle tube 1 along the axis of the positioning sleeve 13. During this process, the second guide slope 17 squeezes the first guide slope 11, driving the first adjusting plate 10 to move outward along the axis of the middle tube 1. The two limiting inserts 7 moving outward of the middle tube 1 are respectively inserted into the two first connecting sleeves 5 and the second connecting sleeve 6, completing the limiting of the middle tube 1 and the folding tube 2 in the unfolded state. When the middle tube 1 and the folding tube 2 are folded, the adjusting handle 26 is rotated in the opposite direction. The adjusting handle 26 drives the second limiting thread 25 to rotate through the adjusting bolt 23. When the second limiting thread 25 disengages from the threaded sleeve 22, the elastic force of the spring 9 acts... When the connecting plate 8 is used, it drives the limiting tube 7 to reset. The reset limiting tube 7 is retracted into the intermediate tube 1. At the same time, the limiting tube 7 also drives the connecting plate 8 and the first adjusting plate 10 to move synchronously. The first adjusting plate 10 presses the second guiding inclined surface 17 through the first guiding inclined surface 11, so that the limiting pin 14 slides out of the intermediate tube 1 along the axis of the positioning sleeve 13. At this time, the first connecting sleeve 5 and the second connecting sleeve 6 that are in contact are opened. The two folding tubes 2 are rotated to be parallel to the intermediate tube 1. During this process, the folding tube 2 gradually approaches the limiting pin 14 until it contacts and presses the limiting pin 14. The limiting pin 14 is forced to retract into the intermediate tube 1. When the folding tube 2 is parallel to the intermediate tube 1, under the elastic force of the spring 9, the limiting pin 14 pops out and is locked into the positioning hole 37, completing the limiting of the folded state of the intermediate tube 1 and the folding tube 2, improving the convenience of the folding operation of the intermediate tube 1 and the folding tube 2, as well as the stability of the posture after folding.

[0045] When it is necessary to unfold the intermediate tube 1 and the folded tube 2, the adjustment handle 26 is pressed down until the second limit thread 25 contacts the threaded sleeve 22 and stops. The descending adjustment handle 26 drives the adjustment rod 28 connected to the abutment 27 to descend, thereby lowering the second adjustment plate 19. The fourth guide slope 20 and the third guide slope 18 on the second adjustment plate 19 drive the limit pin 14 to retract into the intermediate tube 1, thereby releasing the insertion relationship between the limit pin 14 and the positioning hole 37. After releasing the pressure on the adjustment handle 26, the folded tube 2 is rotated to be coaxial with the intermediate tube 1. Then, the adjustment handle 26 is pressed down until the second limit thread 25 contacts the threaded sleeve 22 and the adjustment handle 26 is rotated to make the adjustment bolt 23 continue to descend. The descending adjustment handle 26 drives the adjustment rod 28 connected to the abutment 27 to descend. The adjusting rod 28 drives the second adjusting plate 19 to descend, and the fourth guide slope 20 and the third guide slope 18 on the second adjusting plate 19 abut against each other, causing the limiting pin 14 to slide along the axis of the positioning sleeve 13 into the middle tube 1. The sliding limiting pin 14 abuts against the first guide slope 11 through the second guide slope 17, causing the first adjusting plate 10 to move. The first adjusting plate 10 drives the limiting tube 7 to continue moving out of the middle tube 1 through the connecting plate 8, until the limiting tube 7 is simultaneously inserted with the first connecting sleeve 5 and the second connecting sleeve 6, thus completing the unfolding of the middle tube 1 and the folding tube 2. By having two limiting tubes 7 simultaneously inserted with two first connecting sleeves 5 and two second connecting sleeves 6, the stability of the frame unfolding operation is improved, and the difficulty and time of unfolding the frame are reduced.

[0046] Furthermore, by setting a fifth guide slope 36, even if the first connecting sleeve 5 and the second connecting sleeve 6 are not fully aligned during the unfolding process, the fifth guide slope 36 can still drive the first connecting sleeve 5 and the second connecting sleeve 6 to automatically align during the unfolding of the intermediate tube 1 and the folding tube 2 by contacting and guiding the edge of the inner hole of the second connecting sleeve 6. This improves the fault tolerance rate of the frame unfolding operation and reduces the difficulty and time consumption of the frame unfolding.

[0047] By setting up connecting component 3 and limiting component 4, during maintenance, this device can be disassembled simply by removing the bolts used to fix the first connecting sleeve 5 and the second connecting sleeve 6 with a specific tool. Then, the limiting insert 7 can be slid to both ends of the intermediate tube 1 to pull out the limiting insert 7, connecting plate 8, spring 9 and first adjusting plate 10 from the intermediate tube 1. After rotating the adjusting handle 26 in the opposite direction until the second limiting thread 25 disengages from the threaded sleeve 22, pull up the adjusting handle 26 and continue to reverse the adjusting handle 26 until the adjusting bolt 23 can be disengaged from the threaded sleeve 22. Then, the second adjusting plate 19 can be removed from the intermediate tube 1. Then, the second adjusting plate 19 can be removed from the adjusting rod 28 by sliding it to both ends along the axis of the adjusting rod 28. Finally, rotating the intermediate tube 1 along the axis of the intermediate tube 1 will allow the limiting pin 14 to be emptied out under the action of gravity. All parts are designed to be detachable, and damaged parts can be replaced accordingly, which improves the service life of undamaged parts and reduces the operating cost of this device.

[0048] By setting the connecting component 3, since the adjustment activities of the first adjusting plate 10, the limiting pin 14, and the second adjusting plate 19 are mostly completed inside the intermediate tube 1, it is not easily affected by the external environment, which effectively improves the service life of the connecting component 3. Furthermore, the opening positions on the intermediate tube 1 are all fitted with solid components to avoid deformation caused by force at the opening positions and to ensure the structural strength of the intermediate tube 1.

[0049] When the adjusting handle 26 is rotated to drive the adjusting bolt 23 to rotate and achieve the threaded engagement of the threaded sleeve 22 and the second limiting thread 25, the two ends of the adjusting handle 26 can be bent to avoid interference between the limiting block 30 and the abutment 27 during the rotation of the adjusting handle 26. After the adjusting bolt 23 is adjusted, the bending of the two ends of the adjusting handle 26 can be canceled, and the adjusting handle 26 is rotated until the limiting block 30 is engaged with the limiting groove 29 under the elastic force of the adjusting handle 26 itself. This avoids the second limiting thread 25 from loosening due to vibration generated during vehicle riding, and ensures the limiting stability of the intermediate tube 1 and the folding tube 2. Furthermore, after the adjusting handle 26 is adjusted, the cup can be placed inside the adjusting handle 26. In this state, the deformation resistance of the adjusting handle 26 in the length direction is stronger, and it avoids the upward warping of the position where the adjusting handle 26 is installed due to vehicle vibration, and ensures the engagement stability of the limiting block 30 and the limiting groove 29.

[0050] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A bicycle folding device, characterized in that, include: The middle tube (1) and two folding tubes (2) are rotatably connected to both ends of the middle tube (1) through the connecting component (3). The two folding tubes (2) and the middle tube (1) together form the folding part of the frame. In the folded state, the two folding tubes (2) are located on both sides of the middle tube (1) and are parallel to the middle tube (1). The middle tube (1) is equipped with a limiting component (4) for synchronously limiting the two folding tubes (2) when the two folding tubes (2) are coaxial or parallel to the middle tube (1). The connecting component (3) includes two first connecting sleeves (5) installed at both ends of the intermediate tube (1). The first connecting sleeves (5) are rotatably connected to a second connecting sleeve (6) via connecting lugs (34) and connecting shafts (35). The second connecting sleeve (6) is installed at one end of the folded tube (2) near the intermediate tube (1). The connecting lugs (34) and connecting shafts (35) on the two first connecting sleeves (5) are symmetrically arranged about the center of the middle part of the intermediate tube (1). The limiting component (4) includes a limiting tube (7) that is slidably sleeved with and passes through the first connecting sleeve (5). The limiting tube (7) is adapted to the inner hole of the second connecting sleeve (6). The limiting tube (7) slides along the axial direction of the intermediate tube (1). A fifth guide slope (36) that is symmetrical about the center of the middle part of the intermediate tube (1) is provided on the side of the two limiting tubes (7) that are far away from each other. The side of the limiting tube (7) near the connecting shaft (35) is longer than the side of the limiting tube (7) away from the connecting shaft (35). Two positioning sleeves (13) are provided on the intermediate tube (1) and extend into the intermediate tube (1). The two positioning sleeves (13) are symmetrical about the center of the intermediate tube (1). In the folded state, the folded tube (2) has a positioning hole (37) on the side close to the intermediate tube (1). The limiting component (4) includes a limiting pin (14) that slides through the positioning sleeve (13) and is adapted to the positioning hole (37).

2. The bicycle folding device according to claim 1, characterized in that, A connecting plate (8) is installed at one end of each of the two limiting insertion tubes (7) that are close to each other. The two connecting plates (8) are located at the one end of each of the two second connecting sleeves (6) that are close to each other. A spring (9) that abuts against the second connecting sleeve (6) is installed on the connecting plate (8). The spring (9) is sleeved on the limiting insertion tube (7). A first adjusting plate (10) is installed at the end of the connecting plate (8) that is away from the limiting insertion tube (7). Two second adjusting plates (19) that penetrate and extend into the middle tube (1) are slidably sleeved on the middle tube (1). A connecting hole (21) that penetrates the second adjusting plate (19) is opened on the second adjusting plate (19). A threaded sleeve that penetrates and extends into the middle tube (1) is installed on the middle tube (1). The sleeve (22) is fitted with an adjusting bolt (23) that penetrates the threaded sleeve (22). The adjusting bolt (23) is fitted with a stop (27). The stop (27) is connected to two adjusting rods (28). The adjusting rods (28) are adapted to the connecting holes (21) and penetrate the two connecting holes (21). The top of the adjusting bolt (23) is fitted with an adjusting handle (26). The bottom of the adjusting bolt (23) is provided with a first limiting thread (24) that is adapted to the internal thread of the threaded sleeve (22). The top of the adjusting bolt (23) is provided with a second limiting thread (25) that is adapted to the internal thread of the threaded sleeve (22). The first limiting thread (24) and the second limiting thread (25) are not connected. The limiting pin (14) is provided with a first sliding groove (15) and a second sliding groove (16) that are perpendicular to each other and pass through each other. A second guide slope (17) is provided on one side of the inner wall of the first sliding groove (15). A third guide slope (18) is provided on the inner wall of the second sliding groove (16) away from the second guide slope (17). A first guide slope (11) adapted to the second guide slope (17) is provided on the first adjusting plate (10). A fourth guide slope (20) adapted to the third guide slope (18) is provided on the second adjusting plate (19). The two limiting tubes (7), the two first adjusting plates (10), the two limiting pins (14), and the two second guide slopes (17) are all symmetrically arranged about the center of the middle tube (1). In the folded state, the spring (9) causes the limiting tube (7) to fully retract into the middle tube (1) through its own elastic force. The limiting tube (7) is driven by the cooperation of the first guide slope (11) and the second guide slope (17) on the first adjustment plate (10) to slide one end of the limiting pin (14) to the outside of the middle tube (1) and keep it inserted into the positioning hole (37). During the unfolding process, the second adjustment plate (19) moves downward and is driven by the cooperation of the fourth guide slope (20) and the third guide slope (18) to retract the limiting pin (14) into the middle tube (1). The limiting tube (7) is driven by the cooperation of the second guide slope (17) and the first guide slope (11) to slide out of the middle tube (1).

3. The bicycle folding device according to claim 2, characterized in that, The top of the abutment (27) is evenly provided with several limiting slots (29) around its perimeter, and the bottom of the adjustment handle (26) is provided with one or more limiting blocks (30) that are adapted to the limiting slots (29).

4. The bicycle folding device according to claim 2, characterized in that, The bottom of the adjustment handle (26) is fitted with a stop ring (31), which abuts against the top of the stop seat (27).

5. The bicycle folding device according to claim 2, characterized in that, The first adjusting plate (10) has a relief groove (12) on the side away from the first guide slope (11), and the two first adjusting plates (10) can be staggered on the same horizontal plane through the relief groove (12).

6. The bicycle folding device according to claim 2, characterized in that, The side of the first adjusting plate (10) with the relief groove (12) is in contact with the vertical side of the second adjusting plate (19) near the first adjusting plate (10).

7. The bicycle folding device according to claim 2, characterized in that, The threaded sleeve (22) is located at the top of the intermediate tube (1), and the axis of the threaded sleeve (22) is perpendicular to and does not intersect with the axis of the positioning sleeve (13).

8. The bicycle folding device according to claim 2, characterized in that, A connecting block (32) perpendicular to the axis of the connecting shaft (35) is installed on the side of the first connecting sleeve (5) that abuts against the second connecting sleeve (6). A connecting slot (33) adapted to the connecting block (32) is provided on the side of the second connecting sleeve (6) that abuts against the first connecting sleeve (5).

9. The bicycle folding device according to claim 8, characterized in that, A separator (38) is installed on the side of the second connecting sleeve (6) that abuts against the first connecting sleeve (5), and the separator (38) is located outside the connecting slot (33).

10. The bicycle folding device according to claim 2, characterized in that, In the unfolded state, the limiting tube (7) is simultaneously inserted into the first connecting sleeve (5) and the second connecting sleeve (6). The inner wall of the limiting tube (7) at the joint between the first connecting sleeve (5) and the second connecting sleeve (6) is thickened and a support wall perpendicular to the axis of the limiting tube (7) is provided.

Images