Tricycle

Abstract

The utility model discloses a tricycle which comprises a frame, a front wheel connected with the front end of the frame and a handlebar arranged at the front end of the frame and capable of rotating towards the frame, and further comprises a saddle detachably connected to the frame and provided with a plug-in port, and a handle arranged at the front end of the frame and capable of rotating towards the frame. The backrest assembly comprises a backrest body with an insertion end, the insertion end and the insertion opening are in detachable insertion fit, and the backrest body can rotate relative to the frame; the two double-connecting-rod mechanisms are hinged to the frame, and the tail ends of the double-connecting-rod mechanisms are rotationally connected with rear wheels; and the folding push handle is arranged on the frame and is hinged with the double-connecting-rod mechanism. Therefore, the folding and unfolding states can be flexibly switched. And when in a folded state, the whole structure is very compact, the occupied space is greatly reduced, and the storage and the carrying are convenient.

Description

Technical Field

[0001] This utility model relates to the field of children's riding vehicle technology, and in particular to a tricycle. Background Technology

[0002] A children's tricycle is a small ride-on vehicle specifically designed for children. Its typical features include three wheels, a seat for the child to ride on, a push handle for parental assistance, and a frame for core support. The frame is mostly made of a single piece of steel, which gives the tricycle high structural strength, but also results in a relatively simple shape and frame structure, making it impossible to fold and inconvenient to carry and store. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, one objective of this invention is to provide a tricycle with a flexibly switchable folding and unfolding state. When folded, the overall structure is extremely compact, greatly reducing the space occupied and making it convenient to store and carry.

[0005] To achieve the above objectives, this utility model proposes a tricycle, including a frame, a front wheel connected to the front end of the frame, and a handlebar located at the front end of the frame and rotatable toward the frame. It also includes: a saddle detachably connected to the frame, the saddle having a connector; a backrest assembly including a backrest body with a connector end, the connector end forming a detachable connector with the connector, and the backrest body being rotatable relative to the frame; and two double-link mechanisms, respectively hinged to the frame, with the ends of the double-link mechanisms rotatably connected to a rear wheel.

[0006] A folding handlebar is mounted on the frame. The folding handlebar is hinged to the double-link mechanism and can rotate relative to the frame. It can be used to drive the rear wheel to fold synchronously toward the front wheel via the double-link mechanism, forming a folded state, or to drive the rear wheel to unfold synchronously toward the direction away from the front wheel via the double-link mechanism, forming an unfolded state.

[0007] This utility model relates to a tricycle that can be flexibly switched between folded and unfolded states. When folded, the overall structure is extremely compact, greatly reducing the space occupied and making it convenient to store and carry.

[0008] In addition, the tricycle proposed in the application may also have the following additional technical features:

[0009] Specifically, the double-link mechanism includes a first link and a second link, wherein,

[0010] One end of the first link is hinged to the vehicle frame, and the other end of the first link is rotatably connected to the rear wheel;

[0011] One end of the second link is hinged to the first link, and the other end of the second link is hinged to the folding push handle. The folding push handle rotates toward the frame to drive the first link via the second link to synchronously fold the rear wheel toward the front wheel, forming a folded state. The folding push handle rotates toward the direction away from the frame to drive the first link via the second link to synchronously unfold the rear wheel toward the direction away from the front wheel, forming an unfolded state.

[0012] Specifically, the plug-in end includes an extension section extending toward the saddle direction and a fixed section extending toward the backrest body direction, wherein the extension section and the fixed section are integrally formed, and the extension section is detachably connected to the plug-in interface; the backrest body is provided with a first housing with an opening, the fixed section is at least partially located in the first housing, and the first housing is rotatably connected to the fixed section.

[0013] Specifically, the outer contour of the extension segment matches the inner geometric contour of the insertion interface, and a first limiting hole is provided on the inner bottom wall of the insertion interface; a groove is provided on the extension segment, a first elastic cantilever is provided inside the groove, and a first limiting block is provided on the first elastic cantilever; when the extension segment is inserted into the insertion interface, and one end of the extension segment abuts against the inner wall of the insertion interface, the first limiting block is engaged in the first limiting hole.

[0014] Specifically, the backrest assembly further includes: a first plate and a second plate arranged parallel to each other on the backrest body, the first plate and the second plate being fixedly connected to the first housing, and a guide groove being formed between the first plate and the second plate; a pin slidably disposed in the guide groove; the first housing having a first through hole; and the side wall of the fixed section facing the pin having a plurality of second through holes circumferentially arranged, such that when the first housing rotates relative to the fixed section, the first through hole can be coaxially aligned with any of the second through holes; the backrest body has a rotation adjustment state and an angle locking state: when in the angle locking state, the locking end of the pin passes through the first through hole and the corresponding second through hole in sequence to constrain the angle of the backrest body; when in the rotation adjustment state, the locking end of the pin completely disengages from the second through hole to release the angle constraint on the backrest body.

[0015] Specifically, it also includes a function expansion module, which includes a food tray detachably connected to the backrest body, and the food tray can rotate relative to the backrest body.

[0016] Specifically, the backrest assembly further includes: a second housing with an opening, the second housing being rotatably connected to the first housing, and the second housing having a second limiting hole; the food tray is provided with an insertion end, and the outer contour of the insertion end is adapted to the inner cavity shape of the second housing, the insertion end is provided with a second elastic cantilever, and the second elastic cantilever is provided with a second limiting block, and when the insertion end is fully inserted into the second housing, the second limiting block is engaged in the second limiting hole.

[0017] Specifically, a sleeve is detachably connected to the frame, and the sleeve has a flat mounting base. The folding push handle is rotatably connected to the mounting base. The mounting base is provided with a guide groove, and the folding push handle is provided with a sliding boss that matches the guide groove. The sliding boss is slidably connected in the guide groove. When the folding push handle rotates toward the frame, the sliding boss slides away from the guide groove and can disengage from the guide groove.

[0018] Specifically, it also includes a crossbeam and a locking handle, wherein the crossbeam is mounted and fixed between the two first connecting rods; the locking handle is rotatably connected to the frame, and the free end of the locking handle is provided with a wedge-shaped locking part, which can be locked onto the crossbeam.

[0019] Specifically, the functional expansion module also includes a folding canopy and a footrest. The folding canopy is detachably connected to the backrest body, and the footrest is provided with an arc-shaped groove. The inner wall of the arc-shaped groove abuts against the frame, and the footrest is detachably connected to the saddle. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a tricycle according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of a saddle according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the back-mounted assembly according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of a plug-in terminal according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of a food tray according to an embodiment of the present invention;

[0027] Figure 6 According to this utility model Figure 5 An enlarged structural diagram of region A in the middle;

[0028] Figure 7 This is a schematic diagram of the structure of a tricycle in a folded state according to an embodiment of the present invention;

[0029] Figure 8 According to this utility model Figure 7 An enlarged structural diagram of region B in the middle;

[0030] Figure 9 This is a schematic diagram of the sleeve according to an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the structure of the locking handle being snapped onto the crossbeam according to one embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the structure after the footrest and saddle are separated according to an embodiment of the present invention.

[0033] As shown in the figure:

[0034] 10. Chassis; 100. Sleeve; 1000. Mounting base; 1001. Guide groove;

[0035] 20. Front wheel;

[0036] 30. Handlebars;

[0037] 40. Saddle; 400. Insertion interface; 401. First limiting hole; 402. Insertion port;

[0038] 50. Backing assembly; 501. Backing body; 502. Plug-in end; 503. First housing; 504. First plate; 505. Second plate; 506. Pin; 507. Second housing; 5020. Extension section; 5021. Fixing section; 5022. First elastic cantilever; 5023. First limiting block; 5040. Guide groove; 5070. Second limiting hole; 5071. First protrusion; 5072. Second protrusion; 50200. Groove; 50210. Second through hole;

[0039] 60. Double linkage mechanism; 61. Crossbeam; 62. Locking handle; 601. First link; 602. Second link; 620. Wedge-shaped engagement part;

[0040] 70. Rear wheel;

[0041] 80. Functional expansion module; 800. Meal tray; 801. Folding canopy; 802. Footrest; 8001. Insertion end; 8002. Second elastic cantilever; 8003. Second limiting block; 8004. First limiting groove; 8005. Second limiting groove; 8020. Arc-shaped groove; 8021. Insertion part; 8022. Third elastic cantilever; 8023. Pressing part; 8024. Snap-fit ​​block;

[0042] 90. Folding push handle; 900. Sliding boss. Detailed Implementation

[0043] To better understand the above-mentioned objectives, features, and advantages of this utility model, the solution of this utility model will be further described below. It should be noted that, unless otherwise specified, the embodiments and features of this utility model can be combined with each other.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present invention, and not all embodiments.

[0045] The tricycle of this utility model embodiment will now be described with reference to the accompanying drawings.

[0046] like Figures 1-10 As shown, the tricycle of this utility model embodiment may include a frame 10, a front wheel 20 connected to the front end of the frame 10, and a handlebar 30 disposed at the front end of the frame 10 and capable of rotating in the direction of the frame 10. (See attached diagram.) Figure 1The frame 10 consists of a sleeve, a front fork arm, and a support frame for mounting the seat 40. The front fork arm is rotatably connected to the sleeve, serving not only to connect the front wheel 20 but also to provide a basic mounting structure for the handlebars 30. The front wheel 20 is rotatably mounted in the front fork arm to enable the tricycle to move forward and backward. The handlebars 30 are rotatably connected to the front fork arm towards the support frame, allowing the user to rotate the handlebars 30 for folding and adjustment according to actual needs. This is prior art and will not be elaborated further. As an innovation of this technical solution, the tricycle of this utility model embodiment also includes a seat 40, a backrest assembly 50, two double-link mechanisms 60, a rear wheel 70, a function expansion module 80, and a folding push handle 90.

[0047] The saddle 40 is detachably connected to the frame 10 and has a connector 400. The backrest assembly 50 includes a backrest body 501 with a connector 502. The connector 502 and the connector 400 form a detachable connector, so the backrest assembly 50 can be installed or not according to actual needs. For example, installing the backrest assembly 50 can provide lumbar and back support for young children while riding, reducing fatigue. If the backrest assembly 50 is removed, the riding and activity area can be expanded, providing more space for older children to move their limbs. The number of connectors 400 and connectors 502 can be two.

[0048] The backrest 501 can rotate relative to the frame 10. Firstly, this allows for flexible adjustment of the backrest 501's lumbar support angle, fully adapting to the riding needs of children of different sizes and providing a more comfortable and supportive experience. Secondly, the rotation of the backrest 501 relative to the frame 10 facilitates easy folding. This folding function greatly simplifies the subsequent folding and storage of the tricycle, making the folded tricycle structure more compact and effectively saving storage space.

[0049] Two double-link mechanisms 60 are respectively hinged to the frame 10. Specifically, the double-link mechanisms 60 are hinged to the cantilever that supports the frame and extends away from the sleeve.

[0050] The rear wheel 70 is rotatably connected to the end of the double linkage mechanism 60, and the folding push handle 90 is mounted on the frame 10.

[0051] It should be noted that the folding push handle 90 includes a U-shaped push rod, two extension rods, and a rotating joint with a self-locking function. The two extension rods are rotatably connected to the U-shaped push rod through the rotating joint. The U-shaped push rod can be rotatably connected relative to the extension rod, and the extension rod can be rotatably connected relative to the frame 10.

[0052] As a possible alternative, the folding handle 90 may also be equipped with a cup holder for placing baby bottles or water cups.

[0053] The folding handle 90 is hinged to the double-link mechanism 60, and the folding handle 90 can rotate relative to the frame 10. This allows the rear wheel 70 to be driven by the double-link mechanism 60 to simultaneously fold towards the front wheel 20, forming a folded state; or, the rear wheel 70 to be driven by the double-link mechanism 60 to simultaneously unfold away from the front wheel 20, forming an unfolded state. The user only needs to rotate the folding handle 90 to drive the rear wheel 70 to fold synchronously through the linkage of the double-link mechanism 60. This design simplifies the complex folding action into a simple handle rotation, reducing the steps and difficulty of the folding process. For users, there is no need to spend a lot of time and energy studying complex folding methods; even those with less strength or less operating experience can easily complete the folding operation. For example, parents can quickly fold up the tricycle after taking their children out, saving time and energy.

[0054] It should be noted that, further, one can refer to Figure 7 When the tricycle needs to be folded, first adjust the handlebar 30 towards the seat 40, then rotate the backrest 501 towards the seat 40, and then rotate the folding handle 90. During this process, the double linkage mechanism 60 will generate a linkage effect, thereby driving the rear wheel 70 to fold synchronously, and finally making the tricycle fully folded.

[0055] Conversely, to unfold the tricycle, the operation steps are the reverse of the folding process; simply rotate the folding handle 90 in the opposite direction. Under the coordinated linkage mechanism of the double-link mechanism 60, the rear wheels 70 will unfold simultaneously. After completing this step, adjust the backrest 501 to rotate away from the seat 40, and finally adjust the handlebars 30 to rotate back to the initial position away from the seat 40. The tricycle has now successfully unfolded.

[0056] Specifically, the tricycle designed in this invention has the advantage of being able to flexibly switch between folding and unfolding states compared to existing technologies. When in folded mode, the overall structure is extremely compact, greatly reducing the space occupied and making it convenient to store and carry.

[0057] Meanwhile, by setting up a detachable backrest component 50, users can freely choose to install or remove the backrest component 50 according to the diverse activity needs of children of different ages, fully meeting the needs of children at different growth stages and in different activity scenarios, and greatly improving the practicality and applicability of the product.

[0058] Furthermore, such as Figure 1As shown, the double linkage 60 includes a first link 601 and a second link 602.

[0059] In this design, one end of the first link 601 is hinged to the frame 10, and the other end of the first link 601 is rotatably connected to the rear wheel 70. One end of the second link 602 is hinged to the first link 601, and the other end of the second link 602 is hinged to the folding handle 90. The folding handle 90 rotates toward the frame 10 to drive the first link 601 via the second link 602 to synchronously fold the rear wheel 70 toward the front wheel 20, forming a folded state. The folding handle 90 rotates toward a direction away from the frame 10 to drive the first link 601 via the second link 602 to synchronously unfold the rear wheel 70 toward a direction away from the front wheel 20, forming an unfolded state.

[0060] In the above scheme, the double-link mechanism 60 consists of a first link 601 and a second link 602, and its structure is relatively simple. Compared with complex mechanical transmission structures, it has fewer parts and the manufacturing process is also simpler.

[0061] Specifically, when the folding handle 90 rotates relative to the frame 10, the second link 602 transmits power to the first link 601, causing the first link 601 to rotate around its hinge point with the frame 10, thereby driving the rear wheel 70 to move. This direct transmission between the links ensures the smoothness of the folding action. Simultaneously, during folding, the rear wheel 70 can accurately and synchronously fold towards the front wheel 20. When unfolding, by rotating the folding handle 90 away from the frame 10, the rotation of the folding handle 90 simultaneously pulls the rear wheel 70 out via the second link 602 in conjunction with the first link 601. This operation avoids situations where some parts move first, some parts move later, or the movements are inconsistent, making the folding process smoother and more efficient, thus improving the user experience.

[0062] Furthermore, the double-link mechanism 60 forms a relatively stable mechanical structure during folding. When the rear wheel 70 is folded towards the front wheel 20, the relative positions of the first link 601 and the second link 602 are fixed, capable of withstanding certain external forces without deformation or loosening. It will not unfold on its own due to slight collisions or shaking, making it convenient for users to carry and store. For example, when transporting the folded tricycle, there is no need to worry about it suddenly unfolding, ensuring safety and convenience during transport. Simultaneously, the length of the double-link mechanism 60 and the position of its hinge points can be adjusted according to actual needs. By changing the lengths of the first link 601 and the second link 602, or adjusting their hinge point positions with the frame 10, the rear wheel 70, and the folding handle 90, the folding ratio and the folded size of the tricycle can be altered.

[0063] In one embodiment of this utility model, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the plug-in end 502 includes an extension section 5020 extending toward the saddle 40 and a fixing section 5021 extending toward the back of the body 501.

[0064] The extension section 5020 and the fixed section 5021 are integrally formed, which enables the plug-in end 502 to form a stable overall frame, significantly improving the overall structural strength of the plug-in end 502. When the plug-in end 502 is inserted into the plug interface 400 and subjected to external forces, the integrally formed structure can evenly distribute the force, avoid local stress concentration, and thus ensure that the plug-in end 502 remains stable under stress, effectively enhancing its ability to resist external damage and thus improving the service life of the plug-in end 502.

[0065] The extension section 5020 is detachably connected to the plug-in interface 400. A first housing 503 with an opening is provided on the back of the main body 501. The fixed section 5021 is at least partially located in the first housing 503, and the first housing 503 is rotatably connected to the fixed section 5021.

[0066] In the above scheme, by connecting the extension section 5020 to the plug interface 400, the backrest body 501 can be installed on the saddle 40, and the first housing 503 is rotatably connected to the fixed section 5021, so that the backrest body 501 can rotate relative to the frame 10.

[0067] Furthermore, such as Figure 2 , Figure 3 and Figure 4 As shown, the outer contour of the extension section 5020 matches the inner geometric contour of the interface 400. When the extension section 5020 is inserted into the interface 400, a tight contact is formed between the extension section 5020 and the interface 400, which effectively restricts the relative movement of the two in all directions and reduces the risk of connection failure due to loosening or shaking. At the same time, the extension section 5020 can be directly inserted into the interface 400 without the need for directional or angular adjustments, which reduces the difficulty of installation.

[0068] A first limiting hole 401 is provided on the inner bottom wall of the plug-in interface 400, and a groove 50200 is provided on the extension section 5020. A first elastic cantilever 5022 is provided inside the groove 50200, and a first limiting block 5023 is provided on the first elastic cantilever 5022. When the extension section 5020 is inserted into the plug-in interface 400, and one end of the extension section 5020 abuts against the inner wall of the plug-in interface 400, the first limiting block 5023 is engaged in the first limiting hole 401.

[0069] It should be noted that the shape of the first limiting hole 401 is adapted to that of the first limiting block 5023. For example, if the first limiting hole 401 is circular, then the shape of the first limiting block 5023 is also circular. If the first limiting hole 401 is square, then the shape of the first limiting block 5023 is also square. No limitation is made here.

[0070] In the above scheme, the extension section 5020 is inserted into the insertion interface 400, and the first limiting block 5023 slides in the insertion interface 400, forcing the first elastic cantilever 5022 to be compressed and deformed. If one end of the extension section 5020 abuts against the inner wall of the insertion interface 400, the first limiting block 5023 is just above the first limiting hole 401. Then, the elastic potential energy generated after the first elastic cantilever 5022 is released from the compression constraint can push the first limiting block 5023 to lock in the first limiting hole 401, fixing the position of the insertion end 502. If it is necessary to remove the insertion end 502, it is only necessary to push the first limiting block 5023 upward so that the first limiting block 5023 is disengaged from the first limiting hole 401, and at the same time, pull the insertion end 502 out to disengage. The overall operation is simple and convenient. The first elastic cantilever 5022 can be made of plastic or copper.

[0071] In one embodiment of this utility model, such as Figure 3 As shown, the backrest assembly 50 may further include: a first plate 504 and a second plate 505 arranged parallel to each other on the backrest body 501. The first plate 504 and the second plate 505 are respectively fixedly connected to the first housing 503, and a guide groove 5040 is formed between the first plate 504 and the second plate 505. A pin 506 is slidably disposed in the guide groove 5040. The first housing 503 has a first through hole (not shown in the figure). The side wall of the fixed section 5021 facing the pin 506 has a plurality of second through holes 50210 arranged circumferentially. When the first housing 503 rotates relative to the fixed section 5021, the first through hole can form a coaxial alignment relationship with any of the second through holes 50210.

[0072] It is understood that by inserting the pin 506 into the second through hole 50210 at different positions through the first through hole, the rotation angle of the backrest body 501 can be locked, thereby fully adapting to the riding needs of children of different sizes and providing children with a more fitting and comfortable support experience.

[0073] The backrest body 501 has a rotation adjustment state and an angle locking state: When in the angle locking state, the locking end of the pin 506 passes through the first through hole and the corresponding second through hole 50210 in sequence to constrain the angle of the backrest body 501, which can prevent accidental rotation due to external force during the child's riding and ensure the stability of the backrest angle. When in the rotation adjustment state, the locking end of the pin 506 is completely disengaged from the second through hole 50210 to release the angle constraint on the backrest body 501.

[0074] In the above solution, children of different body types have different needs for backrest angle when riding. By inserting the pin 506 through the first through hole into the second through hole 50210 at different positions, the rotation angle of the backrest body 501 can be flexibly adjusted and locked. For example, a heavier child may need a more reclined backrest angle for more comfortable support, while a thinner child may be more suitable for a relatively straight backrest angle. This multi-angle adjustment function can fully adapt to the riding needs of children of different body types, providing children with a more fitting and comfortable support experience, reducing discomfort or fatigue caused by an unsuitable backrest angle, and helping to improve the comfort and safety of children riding.

[0075] When adjusting the angle of the backrest body 501, simply disengage the locking end of the pin 506 completely from the second through hole 50210, putting the backrest body 501 in a rotation adjustment state. Then, rotate the backrest body 501 to the desired angle and insert the pin 506 into the corresponding second through hole 50210 to lock the angle. The backrest body 501 switches quickly between the rotation adjustment state and the angle locking state, and the entire operation is simple and intuitive, requiring no complicated tools or professional skills.

[0076] As a possible alternative, the pin 506 may also be provided with an operating handle, which extends outward in a direction away from the back of the body 501 to provide a point of leverage for the user to operate and pull the pin 506. In addition, in order to ensure the stability of the pin 506 fixed in the first through hole and the second through hole 50210, an elastic reset member (e.g., a spring) is provided between the pin 506 and the guide groove 5040. The elastic reset member is configured to make the pin 506 always tend to move toward the second through hole 50210.

[0077] In one embodiment of this utility model, such as Figure 1As shown, this utility model tricycle also includes a function expansion module 80, which includes a food tray 800 detachably connected to the backrest body 501. The food tray 800 provides a stable eating platform for children. When children are traveling in the tricycle, food, utensils, etc., can be placed on the food tray 800 for convenient eating. This is especially important for families who need to travel for long periods of time, preventing children from having to interrupt their journey to find a suitable place to eat due to the lack of a suitable eating platform, thus improving the convenience and comfort of travel. At the same time, the food tray 800, as part of the function expansion module 80, adds additional functions and value to the tricycle product. It meets the diverse needs of parents and children during travel. For example, if users feel that the food tray 800 is not needed in certain scenarios (such as short trips or when eating is not required), they can choose not to install it, thereby reducing the overall weight and making it easier for children to ride; while when eating is needed, the food tray 800 can be easily installed to meet diverse usage scenarios.

[0078] The food tray 800 can rotate relative to the backrest 501, allowing for quick adjustment of its position after the child finishes eating by simply rotating it gently towards the backrest 501. This ensures the child's subsequent riding experience is not affected, fully meeting their riding needs, and eliminates the need for cumbersome detachment of the food tray 800 from the backrest 501, saving time and effort and making operation convenient and efficient.

[0079] It should be noted that the food tray 800 needs to be removed before folding the tricycle of this utility model in order to avoid restricting the folding of the tricycle.

[0080] As a possible scenario, in practical use, to further enhance the stability of the food tray 800 during children's eating, two symmetrically distributed arc-shaped buckles can be installed at the bottom of the food tray 800. When a child needs to eat, simply flip the food tray 800 over, causing the two arc-shaped buckles to engage with the corresponding handle positions. This engagement method significantly enhances the stability of the food tray 800, keeping it stable while children eat and preventing shaking from affecting their eating experience.

[0081] Furthermore, such as Figure 1 , Figure 5 and Figure 6As shown, the backing assembly 50 also includes a second housing 507 with an opening. The second housing 507 is rotatably connected to the first housing 503. Specifically, the rotatable connection between the second housing 507 and the first housing 503 can be achieved by providing a damping shaft between the second housing 507 and the first housing 503, or by providing a shaft between the second housing 507 and the first housing 503, with the first housing 503 and the second housing 507 abutting against each other and friction occurring during rotation. The above solutions can ensure that the second housing 507 can only rotate relative to the first housing 503 when it is subjected to an external force.

[0082] The second housing 507 has a second limiting hole 5070, and the food tray 800 is provided with an insertion end 8001. The outer contour of the insertion end 8001 is adapted to the inner cavity shape of the second housing 507. The insertion end 8001 is provided with a second elastic cantilever 8002, and the second elastic cantilever 8002 is provided with a second limiting block 8003. When the insertion end 8001 is fully inserted into the second housing 507, the second limiting block 8003 is engaged in the second limiting hole 5070. The number of insertion ends 8001 and the second housing 507 can be two, thereby improving the stability of the food tray 800 during installation.

[0083] Specifically, when it is necessary to install the food tray 800, simply insert the insertion end 8001 into the second housing 507 through the opening, and make the second limiting block 8003 engage in the second limiting hole 5070 to complete the installation of the food tray 800. If it is necessary to remove the food tray 800, simply press down on the second limiting block 8003 to disengage it from the second limiting hole 5070, and at the same time pull out the support arm of the food tray 800 to complete the disassembly of the food tray 800. The operation is simple and convenient.

[0084] Furthermore, the second housing 507 may also be provided with a first protrusion 5071 and a second protrusion 5072, while the insertion end 8001 is provided with a first limiting groove 8004 and a second limiting groove 8005. When the second limiting block 8003 is engaged in the second limiting hole 5070, the first protrusion 5071 is engaged in the first limiting groove 8004, and the second protrusion 5072 is engaged in the second limiting groove 8005. The first limiting groove 8004 and the first protrusion 5071, the second protrusion 5072 are connected in a series of steps. The shape of the body 5072 is adapted to the shape of the second limiting groove 8005. In the above scheme, the first protrusion 5071 cooperates with the first limiting groove 8004, and the second protrusion 5072 cooperates with the second limiting groove 8005. When the insertion end 8001 rotates, the contact point between the insertion end 8001 and the second housing 507 can be increased, and the force on the second limiting block 8003 can be shared, thereby improving the service life of the second elastic cantilever 8002 and the second limiting block 8003.

[0085] In one embodiment of this utility model, such as Figure 7 , Figure 8 and Figure 9 As shown, a sleeve 100 is detachably connected to the frame 10. The sleeve 100 has a flat mounting base 1000. A folding push handle 90 is rotatably connected to the mounting base 1000. The mounting base 1000 is provided with a guide groove 1001. The folding push handle 90 is provided with a sliding boss 900 that matches the guide groove 1001. The sliding boss 900 is slidably connected in the guide groove 1001. When the folding push handle 90 rotates toward the frame 10, the sliding boss 900 slides away from the guide groove 1001 and can disengage from the guide groove 1001.

[0086] In the above solution, when the sliding boss 900 slides against the guide groove 1001, it can limit the direction and angle of rotation of the folding push handle 90 away from the frame 10, thereby improving the stability when the user pushes the folding push handle 90. At the same time, when the folding push handle 90 rotates towards the frame 10, the sliding boss 900 slides away from the guide groove 1001, which can disengage from the guide groove 1001 and will not affect the rotation of the folding push handle 90.

[0087] In one embodiment of this utility model, such as Figure 7 and Figure 10 As shown, the tricycle of this utility model also includes a crossbeam 61 and a locking handle 62. The crossbeam 61 is mounted and fixed between two first connecting rods 601. The locking handle 62 is rotatably connected to the frame 10, and the free end of the locking handle 62 is provided with a wedge-shaped locking part 620, which can be locked onto the crossbeam 61.

[0088] In the above scheme, by rotating the locking handle 62 toward the crossbeam 61, the wedge-shaped locking part 620 can be locked onto the crossbeam 61, which at this time constrains the rotation angle of the first link 601, thereby ensuring the stability of the tricycle in the unfolded state. By rotating the locking handle 62 away from the crossbeam 61, the wedge-shaped locking part 620 can be disengaged from the crossbeam 61, which releases the constraint on the angle of the first link 601, allowing the first link 601 to rotate.

[0089] In one embodiment of this utility model, such as Figure 1As shown, the functional expansion module 80 also includes a folding canopy 801, which is detachably connected to the backrest body 501. The folding canopy 801 can be fixed to the backrest body 501 by fasteners or by plugging it in. For example, the backrest body 501 is provided with a plugging groove, and the folding canopy 801 has a mounting end that matches the plugging groove. The folding canopy 801 can be installed by inserting the mounting end into the plugging groove.

[0090] In the above solution, by installing a folding canopy 801, when the sun is strong, the folding canopy 801 can be installed on the backrest of the main body 501 to shield the children from the sun and prevent ultraviolet rays from harming their skin. In light rain, the folding canopy 801 can also provide some rain protection, ensuring the comfort of children during travel. When the weather is sunny and no protection is needed, the folding canopy 801 can be removed to reduce the weight of the vehicle and make operation easier.

[0091] In one embodiment of this utility model, such as Figure 1 and Figure 11 As shown, the functional expansion module 80 also includes a footrest 802, which has an arc-shaped groove 8020. The inner wall of the arc-shaped groove 8020 abuts against the frame 10, and the footrest 802 is detachably connected to the saddle 40. It can be understood that the inner wall of the arc-shaped groove 8020 abuts against the frame 10, which means that the frame 10 provides support for the footrest 802. At the same time, the design of the arc-shaped groove 8020 increases the contact area with the frame 10, making the arc-shaped groove 8020 semi-enclose the frame 10, so that the frame 10 also provides a limiting function for the footrest 802, thereby improving the stability of the footrest 802 after installation.

[0092] In the above solution, the footrest 802 provides support for the child's feet, reducing fatigue caused by the child's legs being suspended in the air for a long time.

[0093] Furthermore, to enable the footrest 802 to be detachably connected to the saddle 40, it can be fixed by fasteners, or as described above. Figure 11The footrest 802 is provided with a plug-in portion 8021, and a third elastic cantilever 8022 is provided on the plug-in portion 8021. The third elastic cantilever 8022 extends towards the footrest 802 and onto the footrest 802. The portion of the third elastic cantilever 8022 extending onto the footrest 802 is a pressing portion 8023. The third elastic cantilever 8022 is provided with a locking block 8024. The saddle 40 is provided with a fitting part on the side facing the footrest 802 that is compatible with the plug-in portion 8021 for insertion. When the insertion part 8021 is inserted into the insertion port 402, the locking block 8024 is locked onto the inner wall of the insertion port 402, and the pressing part 8023 is arranged outside the insertion port 402. By pressing the pressing part 8023, the third elastic cantilever 8022 can drive the locking block 8024 away from the inner wall of the insertion port 402. At this time, the insertion part 8021 can be pulled out of the insertion port 402, so that the footrest 802 can be connected to the saddle 40. The operation is simple and convenient.

[0094] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0095] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tricycle, comprising a frame, a front wheel connected to the front end of the frame, and a handlebar disposed at the front end of the frame and rotatable toward the frame, characterized in that, Also includes: The saddle is detachably connected to the frame and has a connector. A backrest assembly includes a backrest body having a plug-in end that forms a detachable plug-in engagement with the plug interface, and the backrest body being rotatable relative to the vehicle frame. Two double-link mechanisms are respectively hinged to the frame, and the ends of the double-link mechanisms are rotatably connected to the rear wheels; A folding handlebar is mounted on the frame. The folding handlebar is hinged to the double-link mechanism and can rotate relative to the frame. It can be used to drive the rear wheel to fold synchronously toward the front wheel via the double-link mechanism, forming a folded state, or to drive the rear wheel to unfold synchronously toward the direction away from the front wheel via the double-link mechanism, forming an unfolded state.

2. The tricycle according to claim 1, characterized in that, The double-link mechanism includes a first link and a second link, wherein... One end of the first link is hinged to the vehicle frame, and the other end of the first link is rotatably connected to the rear wheel; One end of the second link is hinged to the first link, and the other end of the second link is hinged to the folding push handle. The folding push handle rotates toward the frame to drive the first link via the second link to synchronously fold the rear wheel toward the front wheel, forming a folded state. The folding push handle rotates toward the direction away from the frame to drive the first link via the second link to synchronously unfold the rear wheel toward the direction away from the front wheel, forming an unfolded state.

3. The tricycle according to claim 1, characterized in that, The plug-in end includes an extension section extending toward the saddle direction and a fixing section extending toward the backrest body direction, wherein, The extension section is integrally formed with the fixed section, and the extension section is detachably connected to the insertion interface; The backrest body is provided with a first housing with an opening, the fixed section is at least partially located in the first housing, and the first housing is rotatably connected to the fixed section.

4. The tricycle according to claim 3, characterized in that, The outer contour of the extension section matches the inner geometric contour of the insertion interface, and a first limiting hole is provided on the inner bottom wall of the insertion interface; The extension section is provided with a groove, and a first elastic cantilever is provided inside the groove. A first limiting block is provided on the first elastic cantilever. The extension section is inserted into the insertion interface, and when one end of the extension section abuts against the inner wall of the insertion interface, the first limiting block is engaged in the first limiting hole.

5. The tricycle according to claim 3, characterized in that, The back-mounted component also includes: A first plate and a second plate are arranged parallel to each other on the back body. The first plate and the second plate are respectively fixedly connected to the first shell, and a guide groove is formed between the first plate and the second plate. A pin is slidably disposed in the guide groove. The first housing has a first through hole, and the side wall of the fixed section facing the pin has a plurality of second through holes circumferentially. When the first housing rotates relative to the fixed section, the first through hole can be coaxially aligned with any of the second through holes. The backrest body has a rotation adjustment state and an angle locking state: When in the angle-locked state, the locking end of the pin passes through the first through hole and the corresponding second through hole in sequence to constrain the angle of the back against the body. When in the rotation adjustment state, the locking end of the pin is completely disengaged from the second through hole to release the angular constraint on the back body.

6. The tricycle according to claim 3, characterized in that, It also includes a function expansion module, which includes a food tray detachably connected to the backrest body, and the food tray can rotate relative to the backrest body.

7. The tricycle according to claim 6, characterized in that, The back-mounted component also includes: A second housing with an opening is rotatably connected to the first housing, and a second limiting hole is provided on the second housing; The food tray is provided with an insertion end, and the outer contour of the insertion end is adapted to the inner cavity shape of the second housing. The insertion end is provided with a second elastic cantilever, and the second elastic cantilever is provided with a second limiting block. When the insertion end is fully inserted into the second housing, the second limiting block is engaged in the second limiting hole.

8. The tricycle according to claim 1, characterized in that, A sleeve is detachably connected to the frame, and the sleeve has a flat mounting base. The folding push handle is rotatably connected to the mounting base. The mounting base is provided with a guide groove, and the folding push handle is provided with a sliding boss that matches the guide groove. The sliding boss is slidably connected in the guide groove. When the folding push handle rotates toward the frame, the sliding boss slides away from the guide groove and can disengage from the guide groove.

9. The tricycle according to claim 2, characterized in that, It also includes a crossbeam and a locking handle, wherein the crossbeam is mounted and fixed between the two first connecting rods; The locking handle is rotatably connected to the frame, and the free end of the locking handle is provided with a wedge-shaped locking part, which can be locked onto the crossbeam.

10. The tricycle according to claim 6, characterized in that, The functional expansion module also includes a folding canopy and a footrest. The folding canopy is detachably connected to the backrest body, and the footrest is provided with an arc-shaped groove. The inner wall of the arc-shaped groove abuts against the frame, and the footrest is detachably connected to the saddle.

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