Folding device buckled and locked through screws and folding bicycle
Through the screw-buckle locking folding device, a simple and reliable locking structure is achieved using the combination of eccentric and tensioning shaft, which solves the problems of high cost and poor locking stability of the existing folding device, reduces manufacturing costs and improves economic benefits.
Patent Information
- Application Number
- CN202422620620.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-10-29
AI Technical Summary
The core components of existing folding devices are complex in process and are non-standard parts, resulting in high cost and poor locking stability.
A folding device that uses screw buckle locking can achieve a simple and reliable locking structure through the combination of eccentrics, tensioning shafts and screws. The core components use standard part screws to reduce manufacturing costs.
The structure is simple and the locking is reliable, which reduces the manufacturing cost of folding devices and folding vehicles and improves economic benefits.
Smart Images
Figure CN223174254U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of folding devices, in particular to a folding device and a folding vehicle that adopt screw buckling and locking. Background Art
[0002] At present, in order to meet the needs of portability or being able to be placed in the vehicle space, bicycles or electric vehicles usually design the vehicle body as a folding vehicle. To realize the folding of the vehicle body, a folding device is required. The structure of the existing folding device is relatively complex, and almost all of its core components are non-standard parts with complex processes and requiring processing. Therefore, on the one hand, the manufacturing cost of the existing folding device is in a high position, and on the other hand, the locking stability of the folding device is poor. Therefore, it is necessary to improve the existing technology. Summary of the Utility Model
[0003] The utility model provides a folding device and a folding vehicle that adopt screw buckling and locking, mainly solving the technical problems that the folding device of the existing technology has higher costs and poorer locking stability because the core components are all non-standard parts with complex processes and requiring processing.
[0004] To achieve the above object, the utility model provides the following technical solutions:
[0005] A folding device that adopts screw buckling and locking includes a first joint, a second joint and a locking mechanism;
[0006] The first joint is rotatably connected to the second joint on a first side, and the locking mechanism is connected to the first joint on a second side different from the first side. The locking mechanism has a locking state for locking the first joint and the second joint to limit the rotation of the second joint relative to the first joint and an unlocking state for unlocking the second joint to enable the second joint to rotate relative to the first joint;
[0007] The locking mechanism includes an eccentric member, a tensioning shaft and a screw; the eccentric member is rotatably connected to the first joint, the tensioning shaft is threadedly connected to the screw, the tensioning shaft is rotatably connected to an eccentric position of the eccentric member, and the rotation of the eccentric member relative to the first joint is used to pull the tensioning shaft and the screw to move. The second joint is provided with a receiving groove that is open to one side on the second side;
[0008] When the locking mechanism is in the locking state, the screw is inserted into the receiving groove and is clamped with the first joint to clamp the second joint under the action of the eccentric member.
[0009] In one of the technical solutions, the screw includes a screw rod portion and a head integrally connected. The screw rod portion is threadedly connected to the tensioning shaft, and the outer dimension of the head is larger than the width of the receiving groove.
[0010] When the locking mechanism is in the locked state, the screw rod portion is embedded in the receiving groove, and the head is forced by the eccentric member to clamp the second joint together with the first joint.
[0011] In one of the technical solutions, a threaded hole threadedly connected to the screw rod portion is provided on the tensioning shaft. A first locking hole communicating with the threaded hole is further provided on one side of the tensioning shaft. A first locking screw for fixing the tensioning shaft and the screw rod portion is provided in the first locking hole.
[0012] In one of the technical solutions, an eccentric hole is provided in the eccentric member. One end of the tensioning shaft provided with the first locking hole is inserted into the eccentric hole and can rotate in the eccentric hole. An avoidance hole communicating with the eccentric hole is further provided on the end face of the eccentric member located outside. The avoidance hole is used for the first locking screw to be exposed.
[0013] In one of the technical solutions, the locking mechanism further includes a handle. A through hole is provided on the handle. The handle is sleeved on the outer wall of the eccentric member through the through hole and is fixedly connected to the eccentric member. The through hole penetrates through the handle so that the end face of the eccentric member provided with the avoidance hole can be exposed outward.
[0014] In one of the technical solutions, the locking mechanism includes two eccentric members. One end of the tensioning shaft is inserted into the eccentric hole of one of the eccentric members, and the other end of the tensioning shaft is inserted into the eccentric hole of another eccentric member. The screw is located between the two eccentric members. Through holes are provided on both opposite sides of the handle. One of the through holes on the handle is sleeved on the outer wall of one of the eccentric members, and the other through hole on the handle is sleeved on the outer wall of the other eccentric member.
[0015] In one of the technical solutions, the locking mechanism further includes an elastic member. The elastic member is sleeved on the outer wall of the tensioning shaft and is restricted between the two eccentric members. The elastic member abuts against the first joint and the screw respectively. The screw has a tendency to automatically embed into the receiving groove under the elastic force of the elastic member. An arc-shaped curved surface is provided on the head, and a guiding curved surface matching the arc-shaped curved surface is provided at the entrance end of the first receiving groove for the screw to embed.
[0016] In one of the technical solutions, the outer shape of the eccentric member is a non-cylindrical special-shaped structure, the shape of the through hole is adapted to the outer shape of the eccentric member, a second locking hole communicating with the inside of the through hole is provided on the outer wall of the handle, and a second locking screw for locking the handle and the eccentric member is provided in the second locking hole.
[0017] In one of the technical solutions, the locking mechanism further includes a handle, the handle is fixedly connected to the eccentric member, a convex point protrudes from the handle, the screw portion passes through the tensioning shaft, and the convex point is used to push the end of the screw portion away from the head to make the screw disengage from the receiving groove.
[0018] The present application also provides a folding bicycle, which adopts the folding device with screw snap locking described above.
[0019] Compared with the prior art, the folding device with screw snap locking provided by the present utility model has at least the following beneficial effects:
[0020] In this solution, the locking mechanism is designed to mainly include an eccentric member, a tensioning shaft and a screw. When it is necessary to lock the first joint and the second joint, the screw can be pre-embedded into the receiving groove of the second joint, and then the eccentric member is driven to rotate downward. Since the tensioning shaft is connected to the eccentric position of the eccentric member, when the eccentric member rotates downward, the eccentric member will pull the tensioning shaft and the screw to move downward together (during this process, the tensioning shaft will also rotate relative to the eccentric member), so that the screw embedded in the receiving groove can clamp the second joint together with the first joint. At this time, the locking mechanism is in the locked state; when it is necessary to unlock the first joint and the second joint, the eccentric member is driven to rotate in the opposite direction so that the screw no longer clamps the second joint together with the first joint. Then, only need to drive the tensioning shaft to rotate relative to the eccentric member until the screw fixed on the tensioning shaft disengages from the receiving groove of the second joint, and then the second joint can be opened relative to the first joint. At this time, the locking mechanism is in the unlocked state;
[0021] As can be seen from the above paragraph, the folding device of this solution has the advantages of simple structure and reliable locking. Moreover, the core locking components in the folding device of this solution adopt standard screws. Since the screws are standard parts, the procurement cost of the screws is very low, thus the manufacturing cost of the folding device can be greatly reduced, and further the manufacturing cost of the folding bicycle can be reduced. The folding device of this solution has a greater application prospect and can generate better economic benefits. Description of the Drawings
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0023] Figure 1 Schematic diagram of the locking mechanism in a folding device using screw snap locking provided by an embodiment of the present application in an unlocked state;
[0024] Figure 2 For Figure 1 Schematic diagram of the structure of the locking mechanism in the folding device shown switching from the unlocked state to the locked state;
[0025] Figure 3 For <U+ Figure 2 Schematic diagram of the structure of the locking mechanism in the folding device shown further switching to the locked state;
[0026] Figure 4 For Figure 1 Schematic diagram of the structure of the locking mechanism in the folding device shown when it has been switched to the locked state;
[0027] Figure 5 For Figure 1 Exploded view of the structure of the folding device shown;
[0028] Figure 6 Schematic diagram of the tensioning shaft provided by an embodiment of the present application;
[0029] Figure 7 Cross-sectional view of a folding device using screw snap locking provided by an embodiment of the present application when switching from the locked state to the unlocked state.
[0030] Reference numerals:
[0031] 1. First joint; 11. Limiting rod; 12. Rotating hole;
[0032] 2. Second joint; 21. Receiving groove; 22. Guiding curved surface;
[0033] 3. Locking mechanism; 31. Eccentric member; 311. Eccentric hole; 312. Avoidance hole; 32. Tensioning shaft; 321. Threaded hole; 322. First locking hole; 33. Screw; 331. Screw rod part; 332. Head; 3321. Arc-shaped curved surface; 34. Handle; 341. Convex point; 342. Through hole; 343. Second locking hole; 35. Elastic member; 36. Movable screw; 37. First locking screw; 38. Second locking screw;
[0034] 4. Rotating shaft; 5. Fixing screw. Detailed implementation manners
[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, the following further details this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.
[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0037] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to this application.
[0038] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.
[0039] In order to make the purpose, technical solution and advantages of this utility model clearer and more understandable, the following further details this utility model in combination with the accompanying drawings and embodiments.
[0040] Please refer to Figures 1 to 4 , an embodiment of this utility model provides a folding device using screw snap locking, including a first joint 1, a second joint 2 and a locking mechanism 3. Among them, the first joint 1 and the second joint 2 are rotatably connected through a rotating shaft 4 located on the first side, and the locking mechanism 3 is connected to the first joint 1 on the second side different from the first side. The locking mechanism 3 has a locking state for locking the first joint 1 and the second joint 2 to limit the rotation of the second joint 2 relative to the first joint 1, and the locking mechanism 3 also has an unlocking state for unlocking the second joint 2 to enable the second joint 2 to rotate relative to the first joint 1 around the rotating shaft 4. Figure 1 The locking mechanism 3 shown in Figure 2 is in the unlocking state, Figure 3The locking mechanism 3 shown is in Figure 2 a schematic diagram of further switching to the locked state in the shown state, Figure 4 and the locking mechanism shown in is a schematic diagram in a fully locked state. In addition, the first side and the second side in this embodiment are preferably arranged oppositely to ensure that the second joint 2 can be locked more reliably when the locking mechanism 3 is in the locked state.
[0041] Please refer to Figures 1 to 6 together. The locking mechanism 3 specifically includes an eccentric member 31, a tension shaft 32, and a screw 33. The eccentric member 31 is rotatably connected to the first joint 1. The tension shaft 32 is threadedly connected to the screw 33. The tension shaft 32 is rotatably connected to the eccentric position of the eccentric member 31. The rotation of the eccentric member 31 relative to the first joint 1 is used to pull the tension shaft 32 and the screw 33 to move downward together. The second joint 2 is provided with a receiving groove 21 that opens to one side on the second side. This receiving groove 21 is used for the screw 33 to be inserted. Specifically, when it is necessary to lock the first joint 1 and the second joint 2, the screw 33 can be pre-inserted into the receiving groove 21 of the second joint 2 as shown in Figure 3 . Then, the eccentric member 31 is driven to rotate downward manually. Since the tension shaft 32 is connected to the eccentric position of the eccentric member 31, when the eccentric member 31 rotates downward, the eccentric member 31 will pull the tension shaft 32 and the screw 33 to move downward together (during this process, the tension shaft 32 will also rotate relative to the eccentric member 31), so that the screw 33 already inserted into the receiving groove 21 can clamp the second joint 2 together with the first joint 1. At this time, the second joint 2 cannot rotate relative to the first joint 1, that is, at this time, the locking mechanism 3 is in the locked state. When it is necessary to unlock the first joint 1 and the second joint 2, the eccentric member 31 can be driven to rotate in the opposite direction manually, so that the screw 33 no longer clamps the second joint 2 together with the first joint 1. Then, only by driving the tension shaft 32 to rotate relative to the eccentric member 31 until the screw 33 fixed on the tension shaft 32 disengages from the receiving groove 21 of the second joint 2, the second joint 2 can be opened relative to the first joint 1. At this time, the locking mechanism 3 is in the unlocked state.
[0042] More specifically, the screw 33 includes a screw rod portion 331 and a head portion 332 that are integrally connected. The screw rod portion 331 is threadedly connected to the tension shaft 32. When the locking mechanism 3 is in the locked state as shown in Figure 4 , the screw rod portion 331 will be inserted into the receiving groove 21, and the head portion 332 is subjected to the acting force of the eccentric member 31 and clamps the second joint 2 together with the first joint 1. Of course, the outer dimension of the head portion 332 needs to be greater than the width of the receiving groove 21 so that the head portion 332 can clamp the second joint 2 together with the first joint 1.
[0043] As can be seen from the above two paragraphs, the folding device of this solution has the advantages of simple structure and reliable locking. Moreover, the core locking component in the folding device of this solution uses a standard screw 33. Since the screw 33 is a standard part, the procurement cost of the screw 33 is very low, thus greatly reducing the manufacturing cost of the folding device, and further reducing the manufacturing cost of the folding bicycle. The folding device of this solution has a greater application prospect and can generate better economic benefits.
[0044] Preferably, in this embodiment, as Figures 1 to 5 and Figure 7 shown, the locking mechanism 3 further includes a handle 34. The handle 34 is fixedly connected to the eccentric member 31. By providing the handle 34 fixedly connected to the eccentric member 31, it plays a role in extending the eccentric member 31, making it easier for the user to drive the eccentric member 31 to rotate relative to the first joint 1. In addition, please refer to Figure 4 、 Figure 5 and Figure 7 together. A bump 341 is also provided on the handle 34, and the screw part 331 is designed to pass through the entire tensioning shaft 32. The bump 341 is used to push the end of the screw part 331 away from the head 332 to disengage the screw 33 from the receiving groove 21 of the second joint 2. Thus, it can be seen that in addition to facilitating the rotation of the eccentric member 31, the handle 34 also plays a role in pushing the screw 33 out of the receiving groove 21 to unlock the second joint 2. In other embodiments, the locking mechanism 3 may not be provided with the handle 23, and the eccentric member 31 can be formed with an integral handle part during processing, and this handle part is equivalent to the handle 34 separately connected to the eccentric member 31 above.
[0045] Preferably, in this embodiment, please refer to Figures 1 to 5 and Figure 7 together. The locking mechanism 3 further includes an elastic member 35. The elastic member 35 abuts against the first joint 1 and the screw 33 respectively. The screw 33 has a tendency to automatically embed into the receiving groove 21 of the second joint 2 under the elastic force of the elastic member 35. By providing this elastic member 35, when the user moves the second joint 2 closer to the first joint 1, the second joint 2 will push the screw 33 to move against the elastic force of the elastic member 35 as Figure 2 shown. When the second joint 2 is as Figure 3After the ones shown are completely close to each other with the first joint 1, the screw 33 will automatically be embedded into the receiving groove 21 of the second joint 2. In other words, by providing this elastic member 35, during the process of the second joint 2 approaching the first joint 1, the user no longer needs to manually move the screw 33 away, and when the second joint 2 is completely close to the first joint 1 and the second joint 2 needs to be locked, the user also does not need to manually rotate the screw 33 into the receiving groove 21 of the second joint 2, thus simplifying the process of the user locking the second joint 2, and having the advantage of being more convenient for the user to operate. Preferably, in order to ensure the smoothness of the screw 33 automatically being embedded into the receiving groove 21 of the second joint 2 under the elastic force of the elastic member 35 when the second joint 2 approaches the first joint 1, in this embodiment, the head 332 of the screw 33 is preferably designed with an arc-shaped curved surface 3321. In addition, in this embodiment, a guiding curved surface 22 that matches the arc-shaped curved surface 3321 is provided at the entrance end of the receiving groove 21 for the screw 33 to be embedded. Among them, as a standard part, the screw 33 can be a round head screw or a ball head screw having an arc-shaped curved surface 3321.
[0046] Based on the situation where the elastic member 35 is provided, when the user unlocks the second joint 2 by operating the handle 34 as Figure 7 shown, the user actually needs to overcome the elastic force of the elastic member 35. When the second joint 2 is opened and the handle 34 is released, the screw 33 will return to the Figure 1 initial position shown in Figure 1 under the elastic force of the elastic member 35. Preferably, a limiting rod 11 is provided on the first joint 1. When the locking mechanism 3 is in the unlocked state as Figure 1 shown, the screw 33 will abut against the limiting rod 11 under the elastic force of the elastic member 35 to limit the initial position of the screw 33.
[0047] Please refer to Figure 1 and Figure 5 . This supplementary description is that when the locking mechanism 3 is in the locked state, in order to prevent the eccentric member 31 from rotating automatically under the reaction force of the screw 33 and resulting in unstable locking, a method of limiting the position of the eccentric member 31 can be adopted, a method of limiting the position of the handle 34 can also be adopted, or a method of designing the reaction force of the screw 33 on the eccentric member 31 to point to the axis of the eccentric member 31 can be adopted (at this time, since the force received by the eccentric member 31 points to the axis, there is no tendency to rotate automatically). Preferably, a fixing screw 5 is provided on the second joint 2, and a movable screw 36 is provided on the handle 34. When the locking mechanism 3 is in the locked state, the fixing screw 5 and the movable screw 36 are engaged with each other to ensure that the position of the handle 34 will not change under external force or vibration, so as to ensure that the eccentric member 31 fixedly connected to the handle 34 can maintain the position of pulling the screw 33 downward, thereby improving the reliability of the locking mechanism 3 locking the second joint 2.
[0048] As Figure 6 shown, actually, a threaded hole 321 threadedly connected to the screw portion 331 is provided on the tensioning shaft 32. Preferably, a first locking hole 322 communicating with the threaded hole 321 is further provided on the outer wall of the tensioning shaft 32. A first locking screw 37 is provided in the first locking hole 322. The first locking screw 37 is used to fix the tensioning shaft 32 and the screw portion 331 of the screw 33. After loosening the first locking screw 37, the depth of the screw 33 screwed into the threaded hole 321 of the tensioning shaft 32 can be adjusted, which is beneficial to adjusting to the optimal position so that the head 332 of the screw 33 can reliably clamp the second joint 2 together with the first joint 1.
[0049] Please refer to again together with Figures 1 to 7, preferably, a through rotation hole 12 is provided on the first joint 1, and the eccentric member 31 is inserted into the rotation hole 12 to achieve the rotational connection between the eccentric member 31 and the first joint 1. Further preferably, the central axis of the rotation hole 12 and the axis of the rotating shaft 4 are parallel to each other. The rotation of the tensioning shaft 32 connected to the eccentric position of the eccentric member 31 can be specifically understood as that the rotation axis of the tensioning shaft 32 relative to the eccentric member 31 and the central axis of the rotation hole 12 are parallel to each other but do not coincide. Preferably, an eccentric hole 311 is provided on the eccentric member 31, and the central axis of the eccentric hole 311 and the central axis of the rotation hole 12 are parallel to each other but do not coincide. One end of the tensioning shaft 32 provided with the first locking hole 322 is inserted into the eccentric hole 311 to achieve the rotational connection between the tensioning shaft 32 and the eccentric member 31. In addition, an avoidance hole 312 communicating with the eccentric hole 311 is provided on the outer end face of the eccentric member 31. By providing this avoidance hole 312, the first locking screw 37 located in the tensioning shaft 32 can be exposed, enabling the operator to use a tool to pass through the avoidance hole 312 to screw the first locking screw 37, making the structure of the folding device more compact and reasonable. Preferably, a through hole 342 is provided on the handle 34, and the handle 34 is sleeved on the outer wall of the eccentric member 31 through the through hole 342 and fixedly connected to the eccentric member 31. The through hole 342 penetrates the handle 34, so that the end face of the eccentric member 31 provided with the avoidance hole 312 can be exposed outward. That is, through such a design, while achieving the fixed connection between the handle 34 and the eccentric member 31, the avoidance hole 312 at the end face of the eccentric member 31 can also be exposed, so as to achieve the purpose that the operator can use a tool to pass through the avoidance hole 312 to screw the first locking screw 37. In addition, in order to improve the firmness of the connection between the handle 34 and the eccentric member 31, the outer shape of the eccentric member 31 is designed as a non-cylindrical special-shaped structure. Correspondingly, the shape of the through hole 342 on the handle 34 is also designed as a non-cylindrical structure adapted to the eccentric member 31 to prevent the phenomenon of the handle 34 slipping relative to the eccentric member 31. In order to further improve the firmness of the connection between the handle 34 and the eccentric member 31, a second locking hole 343 communicating with the through hole is provided on the outer wall of the handle 34 in this embodiment, and a second locking screw 38 is provided in the second locking hole 343. By providing the second locking screw 38, the handle 34 and the eccentric member 31 can be firmly fixed together.
[0050] Please refer to again together Figures 1 to 7The locking mechanism 3 specifically includes two eccentric members 31, both of which are rotatably connected to the first joint 1. One end of the tensioning shaft 32 is inserted into the eccentric hole 311 of one of the eccentric members 31, and the other end of the tensioning shaft 32 is inserted into the eccentric hole 311 of the other eccentric member 31. The screw 33 is equivalently located between the two eccentric members 31. The elastic member 35 is preferably sleeved on the outer wall of the tensioning shaft 32 and is also located between the two eccentric members 31. The two eccentric members 31 can prevent the elastic member 35 from separating from the tensioning shaft 32. By adopting this design, both ends of the tensioning shaft 32 can rotate relative to the eccentric members 31, and the tensioning shaft 32 is subjected to more uniform force when rotating relative to the eccentric members 31, making the locking mechanism 3 more reliable. Based on this structural design, the above-mentioned through holes 342 are provided on both opposite sides of the handle 34. One of the through holes 342 on the handle 34 is sleeved on the outer wall of one of the eccentric pieces 31, and the other through hole 342 on the handle 34 is sleeved on the outer wall of the other eccentric piece 31, so that the handle 34 can drive the two eccentric pieces 31 to rotate at the same time, and the two eccentric pieces 31 pull the tensioning shaft 32 and the screw 33 downward by rotating at the same time.
[0051] This embodiment also provides a folding bicycle that utilizes the aforementioned screw-engaging locking folding device. For example, when the folding bicycle can only be folded into two halves, the folding bicycle is equivalent to comprising a first body and a second body. The first body is fixedly connected to a first joint 1, and the second body is fixedly connected to a second joint 2, to achieve folding between the first body and the second body. When the locking mechanism 3 within the folding device is in the locked state, the first body and the second body will unfold to form a complete bicycle. In other embodiments, the folding bicycle can also be folded into three or more bodies, and the aforementioned folding device can be applied between two adjacent bodies.
[0052] The above is merely a preferred embodiment of the present invention and only specifically describes the technical principles of the present invention. These descriptions are intended only to explain the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be imagined by those skilled in the art without inventive effort, shall be included within the scope of protection of the present invention.
Claims
1. A folding device using a screw snap lock, comprising a first joint, a second joint and a locking mechanism; The first joint is rotatably connected to the second joint on a first side, and the locking mechanism is connected to the first joint on a second side different from the first side. The locking mechanism has a locking state for locking the first joint and the second joint to limit the rotation of the second joint relative to the first joint, and an unlocking state for unlocking the second joint so that the second joint can rotate relative to the first joint. It is characterized in that: The locking mechanism includes an eccentric member, a tensioning shaft and a screw; the eccentric member is rotatably connected to the first joint, the tensioning shaft is threadedly connected to the screw, the tensioning shaft is rotatably connected to an eccentric position of the eccentric member, and the rotation of the eccentric member relative to the first joint is used to pull the tensioning shaft and the screw to move. The second joint is provided with a receiving groove that is open to one side on the second side; When the locking mechanism is in the locking state, the screw is inserted into the receiving groove and is clamped with the first joint to clamp the second joint under the action of the eccentric member.
2. The folding device using screw snap locking as claimed in claim 1, wherein The screw includes a screw rod portion and a head that are integrally connected. The screw rod portion is threadedly connected to the tensioning shaft, and the outer dimension of the head is larger than the width of the receiving groove; When the locking mechanism is in the locking state, the screw rod portion is inserted into the receiving groove, and the head is clamped with the first joint to clamp the second joint under the action of the eccentric member.
3. The folding device with screw snap locking as claimed in claim 2, wherein A threaded hole threadedly connected to the screw rod portion is provided on the tensioning shaft, and a first locking hole communicating with the threaded hole is further provided on one side of the tensioning shaft. A first locking screw for fixing the tensioning shaft and the screw rod portion is provided in the first locking hole.
4. The folding device with screw snap locking as claimed in claim 3, wherein, An eccentric hole is provided in the eccentric member. One end of the tensioning shaft provided with the first locking hole is inserted into the eccentric hole and can rotate in the eccentric hole. An avoidance hole communicating with the eccentric hole is further provided on the end face of the eccentric member located outside. The avoidance hole is used for the first locking screw to expose.
5. The folding device using screw snap locking as claimed in claim 4, wherein, The locking mechanism further includes a handle. A through hole is provided on the handle. The handle is sleeved on the outer wall of the eccentric member through the through hole and is fixedly connected to the eccentric member. The through hole penetrates the handle so that the end face of the eccentric member provided with the avoidance hole can be exposed outward.
6. The folding device using screw snap locking as claimed in claim 5, characterized in that, The locking mechanism includes two eccentric members. One end of the tensioning shaft is inserted into the eccentric hole of one of the eccentric members, and the other end of the tensioning shaft is inserted into the eccentric hole of the other eccentric member. The screw is located between the two eccentric members. Through holes are provided on both opposite sides of the handle. One of the through holes on the handle is sleeved on the outer wall of one of the eccentric members, and the other through hole on the handle is sleeved on the outer wall of the other eccentric member.
7. The folding device using screw snap locking as described in claim 6, characterized in that, The locking mechanism further includes an elastic member, which is sleeved on the outer wall of the tensioning shaft and restricted between the two eccentric members. The elastic member abuts against the first joint and the screw respectively. The screw has a tendency to automatically embed into the receiving groove under the elastic force of the elastic member. The head is provided with an arc-shaped curved surface, and the inlet end of the receiving groove for the screw to embed is provided with a guiding curved surface that matches the arc-shaped curved surface.
8. The folding device using screw snap locking according to any one of claims 5 to 7, characterized in that, The outer shape of the eccentric member is a non-cylindrical special-shaped structure. The shape of the through hole is adapted to the outer shape of the eccentric member. A second locking hole communicating with the inside of the through hole is provided on the outer wall of the handle, and a second locking screw for locking the handle and the eccentric member is provided in the second locking hole.
9. The folding device with screw snap locking as claimed in claim 2, wherein, The locking mechanism further includes a handle, which is fixedly connected to the eccentric member. A convex point is protruded on the handle. The screw rod portion passes through the tensioning shaft, and the convex point is used to push the end of the screw rod portion away from the head to make the screw disengage from the receiving groove.
10. A folding bicycle, characterized in that, A folding device using screw snap locking according to any one of claims 1 to 9 is adopted.