Folding connector and bicycle

Abstract

This utility model discloses a folding connecting device and a bicycle. The device includes a first body, a second body, a first connecting arm, a second connecting arm, and a buckle structure. The two ends of the first connecting arm are rotatably connected to the first body and the second body, respectively. One end of the second connecting arm is rotatably connected to the first body, and the other end has a buckle structure that can engage with a buckle groove on the first connecting arm, fixing that end within a buckle groove on the second body. When locked, it restricts all rotation, forming a rigid connection; when unlocked, the second connecting arm can disengage, allowing the second body to fold around the first connecting arm. By providing a locking structure with a torsion spring in the second body and a buckle structure with an elastic element in the second connecting arm, this device achieves a quick and intuitive unlocking operation and a stable locking state, effectively solving the problems of traditional single-axis hinges requiring additional locking mechanisms and being cumbersome to operate.

Description

Technical Field

[0001] This utility model relates to the field of mechanical connection structures, and more particularly to a connection device for foldable products and a bicycle including the device. Background Technology

[0002] With the development of modern industrial design and lifestyle concepts, foldable products have been widely used in consumer electronics, furniture, transportation, and other fields due to their significant advantages in portability, storage, and space utilization efficiency. Especially in the field of personal transportation (such as bicycles and scooters), folding designs have greatly improved the practicality and convenience of the products.

[0003] Among the many key technologies in folding products, the implementation of the connecting device directly determines the folding experience, structural strength, and aesthetic integrity of the product. Currently, most common folding connecting devices adopt a simple single-axis hinge structure. Although the single-axis hinge structure is simple, in order to ensure stability after folding, an additional independent locking mechanism is required, such as a quick-release lever, screw, or additional buckle, which makes the folding and unfolding operation steps cumbersome.

[0004] In view of the shortcomings of the existing technologies, there is an urgent need for a new type of folding connection solution. Utility Model Content

[0005] This invention provides a folding connection device and a bicycle, wherein the buckle structure at the end of the second connecting arm can engage with the buckle groove on the first connecting arm, simultaneously fixing the end within the buckling groove of the second main body. When locked, it restricts all rotation, forming a rigid connection; when unlocked, the second connecting arm can disengage, allowing the second main body to fold around the first connecting arm, achieving rapid folding and stable unfolding. This invention provides a stable and reliable connection, similar to a rigid structure, in the unfolded state, ensuring safe use; simultaneously, when folding is required, it can be quickly unlocked through simple and intuitive operation, achieving smooth folding.

[0006] To achieve the above objectives, embodiments of this utility model provide a first main body, a second main body, a first connecting arm, a second connecting arm, and a snap-fit ​​structure. The first end of the first connecting arm is rotatably connected to the first main body, and the second end of the first connecting arm is rotatably connected to the second main body; the first end of the second connecting arm is rotatably connected to the first main body; a snap-fit ​​structure is disposed at the second end of the second connecting arm, and the first connecting arm is provided with a snap-fit ​​groove adapted to the snap-fit ​​structure, the snap-fit ​​end of the snap-fit ​​structure being movably disposed within the snap-fit ​​groove; a fastening slot is provided on the first side of the second main body, the fastening slot being used to accommodate the second end of the second connecting arm; when the snap-fit ​​structure is connected to the snap-fit ​​groove, the second end of the second connecting arm is fixed within the fastening slot; when the snap-fit ​​structure is in the locked state, the snap-fit ​​structure limits the first connecting arm and the second connecting arm to prevent the first connecting arm and the second connecting arm from rotating relative to the first main body and the second main body; when the snap-fit ​​structure is in the unlocked state, the second end of the second connecting arm disengages from the fastening slot, at which time the second main body can rotate around the first connecting arm, so that the second main body can fold to one side of the first main body.

[0007] Furthermore, as a more preferred embodiment of this utility model, the second body is provided with a receiving groove on the side of the fastening groove near the first body, and a rotatable locking structure is provided in the receiving groove. The locking structure includes a hinge part, and a hinge circular groove adapted to the hinge part is provided in the middle of the second connecting arm. When the buckle structure is in the locking state, the hinge part is embedded in the hinge circular groove, and the direction of the hinge part is towards the fastening groove.

[0008] Furthermore, as a more preferred embodiment of this utility model, a rotating slot is provided on the second side of the second main body, and the rotating slot is connected to the fastening slot so that the fastening end of the buckle structure can pass through and be engaged in the buckle slot of the first connecting arm.

[0009] Furthermore, as a more preferred embodiment of this utility model, movable slots are respectively provided on both sides of the end of the first main body, and a rotating shaft is installed in the movable slot. One end of the first connecting arm and the second connecting arm are rotatably connected to the rotating shafts on both sides of the first main body, and when the buckle structure is in the locking state, the outer surfaces of the first connecting arm and the second connecting arm are approximately flush with the outer surface of the first main body.

[0010] Furthermore, as a more preferred embodiment of this utility model, an unfastening groove is provided inside the other end of the second connecting arm. The unfastening groove is adapted to the buckle structure. The buckle structure is disposed in the unfastening groove and can slide along the unfastening groove. The displacement direction of the buckle structure is consistent with the direction in which the buckle end disengages from the buckle groove.

[0011] Furthermore, as a more preferred embodiment of this utility model, the locking structure includes: a locking pin, which is rotatably connected to the receiving slot; a push rod, which is vertically disposed on the locking pin, and the end of the push rod is provided with the hinge portion; and a torsion spring, which is sleeved on the locking pin, with one end inserted into the inner wall of the second body and the other end connected to the push rod; the elastic force of the torsion spring can drive the other end of the second connecting arm away from the fastening slot.

[0012] Furthermore, as a more preferred embodiment of this utility model, the buckle structure includes: a buckle body disposed within the buckling groove, one end of the buckle body having a buckling end extending to the opening of the buckling groove; a buckle member connected to the buckle body, the end of the buckle member forming the buckling end and extending into the second connecting arm; a fixing pin, the middle portion of the buckle body having a movable through groove, the fixing pin being disposed within the buckling groove and passing through the movable through groove; and an elastic member disposed within the movable through groove, one end connected to the bottom of the fixing pin and the other end connected to the bottom inner wall of the movable through groove; the elastic force of the elastic member enables the buckling end of the buckle body to remain extended to the opening of the buckling groove when no external force is applied.

[0013] Furthermore, as a more preferred embodiment of this utility model, the opening of the unfastening groove is provided at the bottom of the second connecting arm, and the bottom of the second connecting arm is provided with a toggle handle. The toggle handle is located on the side of the opening of the unfastening groove away from the second main body, so that the user can push the unfastening end to release the locking state of the buckle structure and the buckle groove, and drive the other end of the second connecting arm away from the second main body through the toggle handle.

[0014] Furthermore, as a more preferred embodiment of this utility model, a positioning protrusion is provided at the middle of the end of the first main body, and a positioning groove adapted to the positioning protrusion is provided at the adjacent end of the second main body. In the locked state, the end of the first main body abuts against the adjacent end of the second main body, and one side of the positioning protrusion moves against one side wall of the positioning groove.

[0015] Based on the same inventive concept, this utility model also provides a bicycle, including: a folding connecting device as described above; a frame bracket, the frame bracket being connected to a first main body of the folding connecting device; a head unit, the head unit being connected to a second main body of the folding connecting device; and, in the unfastened state of the folding connecting device, the head unit can be folded to one side of the frame bracket. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0017] Figure 1 This is an exploded view of the overall structure of the folding connecting device in the embodiment;

[0018] Figure 2 This is another schematic diagram of the overall structure of the folding connecting device in the embodiment in an exploded state;

[0019] Figure 3 This is a schematic diagram of the connection state after the folding connecting device in the embodiment is unfolded;

[0020] Figure 4 This is a schematic diagram of the connection state of the folding connecting device after folding in the embodiment.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1-First main body, 11-Modible slot, 2-Second main body, 21a-First side of the second main body, 21b-Second side of the second main body, 21-Snap-fit ​​slot, 22-Accommodation slot, 23-Pin slot, 24-Rotation slot, 25-Positioning slot, 3-First connecting arm, 31a-First end of the first connecting arm, 31b-Second end of the first connecting arm, 31-Snap-fit ​​slot, 4-Second connecting arm, 41a-First end of the second connecting arm, 41b-Second end of the second connecting arm End, 41-Hinged circular groove, 42-Unlocking groove, 43-Actuating handle, 5-Snap-on structure, 51-Snap-on body, 511-Unlocking end, 512-Modible through groove, 52-Snap-on component, 521-Snap-on end, 53-Fixing pin, 54-Elastic component, 6-Locking structure, 61-Locking pin, 611-Ring groove, 62-Top rod, 621-Hinged part, 63-Torsion spring component, 7-Rotating shaft, 8-Screw, 9-Positioning protrusion, 91-Sloping surface, 100-Folding connecting device. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0027] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0028] Example

[0029] This embodiment aims to address the problem that many existing folding connection devices employ simple single-axis hinge structures. While simple, single-axis hinge structures require additional locking mechanisms, such as quick-release levers, screws, or additional clips, to ensure stability after folding, making the folding and unfolding operations cumbersome. Therefore, referring to... Figure 1-4As shown, this embodiment provides a folding connection device and a bicycle. The latching structure 5 at the end of the second connecting arm 4 can engage with the latching groove 31 on the first connecting arm 3, simultaneously fixing the end within the latching groove 21 of the second body 2. When latched, it restricts all rotation, forming a rigid connection; when unlocked, the second connecting arm 4 can disengage, allowing the second body 2 to fold around the first connecting arm 3, achieving rapid folding and stable unfolding. This invention provides a stable and reliable connection, similar to a rigid structure, in the unfolded state, ensuring safe use; simultaneously, when folding is required, it can be quickly unlocked through simple and intuitive operation, achieving smooth folding.

[0030] Reference Figure 1-4 As shown, a folding connecting device 100 includes a first body 1, a second body 2, a first connecting arm 3, a second connecting arm 4, and a snap-fit ​​structure 5.

[0031] The first end 31a of the first connecting arm 3 is rotatably connected to the first main body 1, and the second end 31b of the first connecting arm 3 is rotatably connected to the second main body 2. The first connecting arm 3 provides a flexible rotatable connection between the two main bodies. For example, one end is connected to the first main body 1 via a pivot 7, ensuring that the first connecting arm 3 can rotate smoothly and steadily relative to the first main body 1 during folding and unfolding. The other end is also rotatably connected to the second main body 2, ensuring that the second main body 2 can rotate as necessary relative to the first connecting arm 3, and also making the entire folding connection device 100 more flexible and adaptable in operation.

[0032] The first end 41a of the second connecting arm 4 is rotatably connected to the first main body 1. The snap-fit ​​structure 5 is provided at the second end 41b of the second connecting arm 4. The first connecting arm 3 is provided with a snap-fit ​​groove 31 that is adapted to the snap-fit ​​structure 5. The snap-fit ​​end 521 of the snap-fit ​​structure 5 can be movably disposed in the snap-fit ​​groove 31.

[0033] The first side 21a of the second main body 2 is provided with a snap-fit ​​groove 21, which is used to accommodate the second end 41b of the second connecting arm 4. When the snap-fit ​​structure 5 is connected to the snap-fit ​​groove 31, the second end 41b of the second connecting arm 4 is fixed in the snap-fit ​​groove 21.

[0034] When the latching structure 5 is in the latching state, the latching structure 5 limits the first connecting arm 3 and the second connecting arm 4 to prevent the first connecting arm 3 and the second connecting arm 4 from rotating relative to the first body 1 and the second body 2.

[0035] When the latching structure 5 is in the unlocked state, the second end 41b of the second connecting arm 4 can disengage from the latching slot 21, and the second body 2 can rotate around the first connecting arm 3, allowing the second body 2 to fold to one side of the first body 1. Understandably, in the locked state, the cooperation between the latching structure 5 and the latching slot 31 ensures a stable connection between the first connecting arm 3 and the second connecting arm 4 on their respective bodies, preventing wobbling or misalignment, thus guaranteeing the rigidity and safety of the entire device. When folding is required, the user simply operates the latching structure 5 to unlock it, allowing the second connecting arm 4 to easily disengage from the latching slot 21, and the second body 2 to rotate flexibly around the first connecting arm 3, achieving a quick and smooth folding process.

[0036] Reference Figure 1 As shown, in some embodiments, the second body 2 has a receiving slot 22 on the side of the fastening slot 21 near the first body 1. A rotatable locking structure 6 is provided within the receiving slot 22. The locking structure 6 includes a hinge portion 621, and a hinge circular groove 41 adapted to the hinge portion 621 is provided in the middle of the second connecting arm 4. When the latching structure 5 is in the locked state, the hinge portion 621 is embedded in the hinge circular groove 41, and the direction of the hinge portion 621 faces the fastening slot 21. The locking structure 6 further enhances the stability of the latch. The hinge portion 621 facilitates the connection between the locking structure 6 and the second connecting arm 4, and also provides additional fixing force during locking, preventing unlocking due to vibration or external forces. Furthermore, the design of the hinge portion 621 facing the fastening slot 21 ensures that the locking structure 6 and the fastening slot 21 form a double lock in the locked state, maintaining a stable locking state even if the latching structure 5 is subjected to accidental impact, ensuring safe use.

[0037] Reference Figure 1 and 2As shown, in some embodiments, the locking structure 6 includes a locking pin 61, a push rod 62, and a torsion spring 63. The locking pin 61 is rotatably connected to the receiving slot 22. The push rod 62 is vertically disposed on the locking pin 61, and a hinge portion 621 is provided at the end of the push rod 62. The torsion spring 63 is sleeved on the locking pin 61, with one end inserted into the inner wall of the second body 2 and the other end connected to the push rod 62. The elastic force of the torsion spring 63 can drive the other end of the second connecting arm 4 away from the locking slot 21. The rotatable connection design between the locking pin 61 and the receiving slot 22 not only facilitates the operation of the locking structure 6 but also adapts to locking requirements at different angles. The push rod 62 is vertically disposed on the locking pin 61, ensuring accurate alignment of the hinge portion 621 and the hinge groove 41, thereby improving locking efficiency. The torsion spring 63 cleverly utilizes the principle of elastic force to achieve automatic locking and unlocking of the latch structure 6 without the need for additional external force, making operation simpler. Furthermore, one end of the torsion spring 63 is inserted into the inner wall of the second main body 2, and the other end is connected to the top rod 62. This structural design allows the elastic force of the torsion spring 63 to be evenly transmitted to the latch pin 61 and the top rod 62, further enhancing the stability and durability of the latch structure 6.

[0038] Reference Figure 1 and 2 As shown, it should be added that the second body 2 is provided with a pin groove 23 adapted to the locking pin 61. Both ends of the locking pin 61 are inserted into the pin groove 23 and can rotate along the pin groove 23. The top of the locking pin 61 is provided with an annular groove 611. A screw 8 passes through one side of the annular groove 611 in the second body 2, so that the top or bottom of the locking pin 61 is fixed in a pin groove 23. Through the fixing action of the screw 8, the transition of the locking pin 61 between the locked and unlocked states is more stable, effectively preventing it from falling off due to rotation. Furthermore, the design of the annular groove 611 not only facilitates the insertion of the screw 8 but also provides a certain guiding effect when the locking pin 61 rotates, ensuring that the locking pin 61 can rotate along the pin groove 23.

[0039] Reference Figure 1 and 2 As shown, in some embodiments, the second side 21b of the second main body 2 is provided with a rotating slot 24, which is connected to the fastening slot 21, so that the fastening end 521 of the fastening structure 5 can pass through and engage with the fastening slot 31 of the first connecting arm 3. The connection between the rotating slot 24 and the fastening slot 21 allows the fastening end 521 to move flexibly between the two slots, ensuring the smooth operation of the fastening structure 5.

[0040] Reference Figure 1 and 2As shown, in some embodiments, movable slots 11 are respectively provided on both sides of the end of the first main body 1. A rotating shaft 7 is installed within the movable slot 11. One end of the first connecting arm 3 and the second connecting arm 4 are rotatably connected to the rotating shafts 7 on both sides of the first main body 1. When the latching structure 5 is in the locked state, the outer surfaces of the first connecting arm 3 and the second connecting arm 4 are approximately flush with the outer surface of the first main body 1. This not only makes the entire device more aesthetically pleasing but also avoids inconvenience caused by protruding parts when holding or storing it. It can be understood that after the other end of the first connecting arm 3 and the second connecting arm 4 is connected to the rotating slot 24 and the latching slot 31, in the locked state, it is approximately flush with the outer surface of the second main body 2. This not only ensures a tight structural connection but also maintains smooth lines and visual appeal. Simultaneously, in the locked state, the first connecting arm 3 and the second connecting arm 4 are flush with the outer surfaces of the first main body 1 and the second main body 2, avoiding possible snagging or collisions during use and improving the user experience.

[0041] Reference Figure 1 and 2 As shown, in some embodiments, the other end of the second connecting arm 4 is provided with an unfastening groove 42, which is adapted to the buckling structure 5. The buckling structure 5 is disposed in the unfastening groove 42 and can slide along the unfastening groove 42. The displacement direction of the buckling structure 5 is consistent with the direction in which the buckling end 521 disengages from the buckling groove 31.

[0042] Reference Figure 1 and 2 As shown, in some embodiments, the snap-fit ​​structure 5 includes a snap-fit ​​body 51, a snap-fit ​​member 52, a fixing pin 53, and an elastic member 54. The snap-fit ​​body 51 is disposed in the snap-fit ​​groove 42, and one end of the snap-fit ​​body 51 is provided with a snap-fit ​​end 511, which extends to the opening of the snap-fit ​​groove 42; the snap-fit ​​member 52 is connected to the snap-fit ​​body 51, and the end of the snap-fit ​​member 52 forms the snap-fit ​​end 521, extending out a second connecting arm 4; a movable through groove 512 is provided in the middle of the snap-fit ​​body 51, and a fixing pin 53 is disposed in the snap-fit ​​groove 42, with the fixing pin 53 passing through the movable through groove 512; the elastic member 54 is disposed in the movable through groove 512, and one end is connected to the snap-fit ​​body 512. The bottom of the fixing pin 53 is connected, and the other end is connected to the bottom inner wall of the movable through groove 512. The elastic force of the elastic element 54 allows the unlocking end 511 of the buckle body 51 to remain extended to the opening of the unlocking groove 42 when no external force is applied. At the same time, when an external force is applied to the unlocking end 511, the unlocking end 511 can overcome the elastic force of the elastic element 54 and move into the unlocking groove 42, thereby driving the buckle body 51 and the buckle element 52 to move, causing the buckle end 521 to disengage from the buckle groove 31, thus unlocking. This design makes the operation of the buckle structure 5 simpler, and users can unlock it with a simple pressing action, improving the convenience of use.

[0043] Reference Figure 1 and 2 As shown, in some embodiments, the opening of the release groove 42 is located at the bottom of the second connecting arm 4, and the bottom of the second connecting arm 4 is provided with a toggle handle 43. The toggle handle 43 is located on the side of the release groove 42 away from the second body 2, so that the user can push the release end 511 to release the locking state between the latching structure 5 and the latching groove 31, and drive the other end of the second connecting arm 4 away from the second body 2 by toggle the handle 43. The user can easily release the locking state by simply pushing the release end 511 with his fingertip. At the same time, the setting of the toggle handle 43 provides the user with a convenient point of force, so that the user can drive the second connecting arm 4 by toggle the handle 43, thereby driving the connected part to move.

[0044] Reference Figure 1 and 2 As shown, in some embodiments, a positioning protrusion 9 is provided at the middle of the end of the first body 1, and a positioning groove 25 adapted to the positioning protrusion 9 is provided at the adjacent end of the second body 2. In the locked state, the end of the first body 1 abuts against the adjacent end of the second body 2, and one side of the positioning protrusion 9 moves against one side wall of the positioning groove 25. A certain movable gap is formed between the other side of the positioning protrusion 9 and the other side wall of the positioning groove 25, and the other side wall of the positioning protrusion 9 is a slope surface 91. While enhancing the stability of the first body 1 and the second body 2 in the locked state, the design of the slope surface 91 allows the positioning protrusion 9 to smoothly slide into or out of the positioning groove 25 during folding or unfolding, reducing resistance and inconvenience during operation and improving the user experience.

[0045] Reference Figure 1-4 As shown, this embodiment also provides a bicycle, including the folding connecting device 100, frame bracket and headstock as described above.

[0046] The bicycle frame is connected to the first main body 1 of the folding connecting device 100; the front body is connected to the second main body 2 of the folding connecting device 100; when the folding connecting device 100 is in the unlocked state, the front body can be folded to one side of the frame frame. This implementation not only makes the bicycle more convenient to carry and store, saving space, but also ensures safety and stability during riding through the secure locking state of the folding connecting device 100. After unlocking the folding connecting device 100, the front body can be smoothly folded to one side of the frame frame. The whole process is simple to operate, requiring no complicated steps, greatly improving user convenience and user experience.

[0047] The electronic devices provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A folding connection device, characterized in that include: First subject; Second subject; A first connecting arm, wherein a first end of the first connecting arm is rotatably connected to the first main body, and a second end of the first connecting arm is rotatably connected to the second main body; The second connecting arm has a first end that is rotatably connected to the first body. A snap-fit ​​structure is provided at the second end of the second connecting arm. The first connecting arm is provided with a snap-fit ​​groove that is adapted to the snap-fit ​​structure. The snap-fit ​​end of the snap-fit ​​structure can be movably disposed in the snap-fit ​​groove. The second main body has a snap-fit ​​groove on its first side, which is used to accommodate the second end of the second connecting arm; the snap-fit ​​structure is connected to the snap-fit ​​groove, so that the second end of the second connecting arm is fixed in the snap-fit ​​groove. When the latching structure is in the latching state, the latching structure limits the first connecting arm and the second connecting arm to prevent the first connecting arm and the second connecting arm from rotating relative to the first body and the second body; When the buckle structure is in the unbuckled state, the second end of the second connecting arm disengages from the buckle slot. At this time, the second body can rotate around the first connecting arm so that the second body can be folded to one side of the first body.

2. The folding connection device of claim 1, wherein The second main body has a receiving groove on the side of the fastening groove near the first main body. A rotatable locking structure is provided in the receiving groove. The locking structure includes a hinge part. The middle part of the second connecting arm is provided with a hinge circular groove that matches the hinge part. When the buckle structure is in the locking state, the hinge part is embedded in the hinge circular groove, and the direction of the hinge part is towards the fastening groove.

3. The folding connection device of claim 1, wherein The second body has a rotating slot on its second side, which is connected to the snap-fit ​​slot so that the snap-fit ​​end of the snap-fit ​​structure can pass through and snap into the snap-fit ​​slot of the first connecting arm.

4. The folding connection device of claim 1, wherein Movable slots are provided on both sides of the end of the first main body. A rotating shaft is installed in the movable slot. One end of the first connecting arm and the second connecting arm are rotatably connected to the rotating shafts on both sides of the first main body. When the buckle structure is in the locking state, the outer surfaces of the first connecting arm and the second connecting arm are approximately flush with the outer surface of the first main body.

5. The folding connection device of claim 1, wherein, The other end of the second connecting arm is provided with an unfastening groove, which is adapted to the buckle structure. The buckle structure is disposed in the unfastening groove and can slide along the unfastening groove. The displacement direction of the buckle structure is consistent with the direction in which the buckle end disengages from the buckle groove.

6. The folding connection device of claim 2, wherein, The locking structure includes: A locking pin, wherein the locking pin is rotatably connected to the receiving slot; A push rod, which is vertically mounted on the locking pin, and the end of the push rod is provided with the hinge portion; A torsion spring is sleeved on the locking pin, with one end inserted into the inner wall of the second body and the other end connected to the top rod; the elastic force of the torsion spring can drive the other end of the second connecting arm away from the fastening slot.

7. The folding connection device of claim 5, wherein, The snap-fit ​​structure includes: The buckle body is disposed in the buckle release groove, and one end of the buckle body is provided with a buckle release end, which extends to the opening of the buckle release groove; A fastener, which is connected to the fastener body, wherein the end of the fastener forms the fastener end and extends out to form the second connecting arm; A fixing pin is provided in the middle of the buckle body, and the fixing pin is provided in the buckle release groove, and the fixing pin passes through the movable groove. An elastic element is disposed in the movable through groove, with one end connected to the bottom of the fixed pin and the other end connected to the bottom inner wall of the movable through groove; the elastic force of the elastic element enables the unhooking end of the buckle body to remain extended to the opening of the unhooking groove when no external force is applied.

8. The folding connection device of claim 7, wherein, The opening of the release groove is located at the bottom of the second connecting arm, and the bottom of the second connecting arm is provided with a toggle handle. The toggle handle is located on the side of the release groove away from the second main body, so that the user can push the release end to release the locking state of the buckle structure and the buckle groove, and drive the other end of the second connecting arm away from the second main body through the toggle handle.

9. The folding connection device according to claim 1 or 4, characterized in that The first main body has a positioning protrusion in the middle of its end, and the adjacent end of the second main body has a positioning groove that matches the positioning protrusion. In the locked state, the end of the first main body abuts against the adjacent end of the second main body, and one side of the positioning protrusion moves against one side wall of the positioning groove.

10. A bicycle characterized in that, include: The folding connecting device as described in any one of claims 1-9; A vehicle body bracket, wherein the vehicle body bracket is connected to the first main body of the folding connecting device; The front body of the vehicle is connected to the second body of the folding connecting device; When the folding connection device is unfastened, the main body of the vehicle can be folded to one side of the vehicle body support.

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