Stroller

CN224766804UActive Publication Date: 2026-09-18SHENZHEN YINGPAI TECHNOLOGY CO LTD +1
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Patent Information

Application Number
CN202522433625.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-11-17
Publication Date
2026-09-18
Estimated Expiration
2035-11-17

AI Technical Summary

Technical Problem

[0004]本申请的目的在于解决相关技术中,婴儿推车因采用复杂的多连杆系统而导致的结构冗余、收折后尺寸偏大、以及需要手动拆卸部件才能满足携带或储藏要求等问题

Benefits of technology

[0016] The stroller disclosed in this application includes a handlebar assembly, a front leg assembly, a rear leg assembly, a pivot seat, and a sliding member. The handlebar assembly, front leg assembly, and rear leg assembly converge at the pivot seat and are hinged at the pivot seat to form the main frame of the stroller. The sliding member is located at the pivot seat and extends along the rotation axis of the pivot seat for transmission connection with the handlebar assembly, front leg assembly, and rear leg assembly. By adopting a structure in which a sliding member extending along the rotation axis is provided on the handlebar assembly, front leg assembly, and rear leg assembly that converge at the pivot seat, and is transmissionally connected to all three, the coordinated transmission of a single sliding member at the pivot seat effectively reduces the complex multi-link system in related art strollers, thereby significantly simplifying the frame structure and reducing the number of parts and costs.

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Abstract

The application belongs to the technical field of baby carriers, and particularly relates to a baby stroller, which comprises a handle assembly, a front leg assembly, a rear leg assembly, a pivot joint seat and a sliding piece, the handle assembly, the front leg assembly and the rear leg assembly meet at the pivot joint seat and are hinged at the pivot joint seat to form a main frame of a stroller body; the sliding piece is arranged on the pivot joint seat and extends along a rotation axis of the pivot joint seat to be in transmission connection with the handle assembly, the front leg assembly and the rear leg assembly. The application sets the sliding piece extending along the rotation axis on the handle assembly, the front leg assembly and the rear leg assembly meeting at the pivot joint seat and makes the sliding piece in transmission connection with the three assemblies, utilizes the cooperative transmission of the single sliding piece at the pivot joint seat, effectively reduces the complex multi-link system in the related art baby stroller, and thus significantly simplifies the frame structure and reduces the number and cost of parts.
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Description

Technical Field

[0001] This application belongs to the field of infant vehicle technology, specifically relating to an infant stroller. Background Technology

[0002] Baby strollers are a common mode of transportation for infants and toddlers, widely used for family outings and outdoor activities. They typically consist of a frame, wheels at the bottom of the frame, and a seat mounted on the frame. For ease of storage and portability, most baby strollers on the market are designed with a foldable structure.

[0003] However, foldable strollers in related technologies typically rely on complex multi-link systems to ensure their folding function and stability, resulting in structural redundancy, high costs, and a less streamlined appearance. Furthermore, many products remain quite large when folded, especially in the height direction, often requiring manual disassembly to meet the requirements for air travel or compact storage, causing inconvenience and the risk of parts loss for users. Utility Model Content

[0004] The purpose of this application is to solve the problems in related technologies, such as structural redundancy, large folded size, and the need for manual disassembly of parts to meet carrying or storage requirements caused by the use of complex multi-link systems in baby strollers.

[0005] This application provides a baby stroller, including a handlebar assembly, a front leg assembly, a rear leg assembly, a pivot seat, and a slider. The handlebar assembly, the front leg assembly, and the rear leg assembly converge at the pivot seat and are hinged at the pivot seat to form the main frame of the stroller. The slider is disposed on the pivot seat and extends along the rotation axis of the pivot seat to be drive-connected to the handlebar assembly, the front leg assembly, and the rear leg assembly.

[0006] In one exemplary embodiment of this application, the pivot joint includes a first pivot joint, a second pivot joint, and a third pivot joint. The first pivot joint is connected to the rider assembly, the second pivot joint is connected to the front leg assembly, and the third pivot joint is connected to the rear leg assembly. The first pivot joint, the second pivot joint, and the third pivot joint are stacked and coaxially hinged.

[0007] In one exemplary embodiment of this application, the sliding member is disposed on the first pivot joint, the second pivot joint is provided with an elongated groove, the third pivot joint is provided with a first arc-shaped groove corresponding to the elongated groove, and the sliding member passes through the elongated groove and is inserted into the first arc-shaped groove.

[0008] In one exemplary embodiment of this application, the first pivot joint is provided with a second arc-shaped groove, and the sliding member is adjustablely disposed in the second arc-shaped groove.

[0009] In one exemplary embodiment of this application, the second pivot joint has protruding shafts on opposite sides, and the first pivot joint and the third pivot joint have corresponding connecting grooves. The protruding shafts are inserted into the connecting grooves to coaxially hinge the first pivot joint, the second pivot joint, and the third pivot joint.

[0010] In one exemplary embodiment of this application, the pivot seat further includes an outer cover, which is disposed on the side of the first pivot joint and / or the third pivot joint away from the second pivot joint.

[0011] In an exemplary embodiment of this application, the pivot seat further includes a first protrusion, a second protrusion, a first arcuate groove, and a second arcuate groove, wherein the first arcuate groove and the second arcuate groove are respectively disposed on opposite sides of the second pivot joint; the first protrusion is disposed on the rider assembly and received in the first arcuate groove; the second protrusion is disposed on the front leg assembly and received in the second arcuate groove.

[0012] In one exemplary embodiment of this application, the trolley further includes a support member that is hinged to the rider assembly and the rear leg assembly, respectively.

[0013] In one exemplary embodiment of this application, the stroller further includes a seat assembly and an elastic member, the rear end of the seat assembly being connected to the support member, and the front end of the seat assembly being connected to the front leg assembly via the elastic member.

[0014] In one exemplary embodiment of this application, the front leg assembly includes a first front leg, a second front leg, and a connecting rod. The first front leg and the second front leg are spaced apart along the rotation axis of the pivot seat, and the connecting rod is disposed between the first front leg and the second front leg. The elastic element is disposed between the seat assembly and the connecting rod.

[0015] The baby stroller proposed in this application has at least the following beneficial effects:

[0016] The stroller disclosed in this application includes a handlebar assembly, a front leg assembly, a rear leg assembly, a pivot seat, and a sliding member. The handlebar assembly, front leg assembly, and rear leg assembly converge at the pivot seat and are hinged at the pivot seat to form the main frame of the stroller. The sliding member is located at the pivot seat and extends along the rotation axis of the pivot seat for transmission connection with the handlebar assembly, front leg assembly, and rear leg assembly. By adopting a structure in which a sliding member extending along the rotation axis is provided on the handlebar assembly, front leg assembly, and rear leg assembly that converge at the pivot seat, and is transmissionally connected to all three, the coordinated transmission of a single sliding member at the pivot seat effectively reduces the complex multi-link system in related art strollers, thereby significantly simplifying the frame structure and reducing the number of parts and costs.

[0017] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0020] Figure 1 A three-dimensional structural schematic diagram of the baby stroller provided in an embodiment of this application is shown.

[0021] Figure 2 The diagram shows an exploded view of the pivot seat provided in an embodiment of this application.

[0022] Figure 3 An exploded view of the pivot seat provided in an embodiment of this application is shown.

[0023] Figure 4 A cross-sectional structural diagram of the slider inserted into the first arc-shaped groove according to an embodiment of this application is shown.

[0024] Figure 5 This is a cross-sectional exploded view of a slider inserted into a long slot according to an embodiment of this application.

[0025] Figure 6 This is a cross-sectional exploded view of the slider inserted into the second arc-shaped groove according to an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures: 100. Baby stroller; 110. Handler assembly; 120. Front leg assembly; 121. First front leg; 122. Second front leg; 123. Linkage; 130. Rear leg assembly; 140. Pivot seat; 141. First pivot joint; 1410. Second arc-shaped groove; 1411. First end of the second arc-shaped groove; 1412. Second end of the second arc-shaped groove; 142. Second pivot joint; 1420. Long groove; 1421. First end of the long groove; 1422. Second end of the long groove; 143. Third pivot joint; 1430. First arc-shaped groove; 1431, First end of the first arc-shaped groove; 1432, Second end of the first arc-shaped groove; 144, First protrusion; 145, Second protrusion; 146, First arc-shaped groove; 1460, First end of the first arc-shaped groove; 1461, Second end of the first arc-shaped groove; 147, Second arc-shaped groove; 1470, First end of the second arc-shaped groove; 1471, Second end of the second arc-shaped groove; 148, Outer cover; 150, Sliding member; 160, Support member; 170, Seat assembly; 180, Elastic member; O, Pivot point. Detailed Implementation

[0027] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0028] In this application, 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" means two or more, unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0031] In related technologies, baby strollers typically use complex multi-link systems to achieve the folding function, resulting in structural redundancy and numerous parts, which not only increases manufacturing costs but also affects the stroller's portability and aesthetics.

[0032] To address the aforementioned issues, this application provides a baby stroller 100, which effectively simplifies the structure and significantly improves folding efficiency through a sliding member 150.

[0033] The stroller 100 may include a handlebar assembly 110, a front leg assembly 120, a rear leg assembly 130, a pivot seat 140, and a slider 150. The handlebar assembly 110, front leg assembly 120, and rear leg assembly 130 meet and hinge at the pivot seat 140, forming a stable main frame. The slider 150 is disposed inside the pivot seat 140 and extends along the rotation axis of the pivot seat 140, forming a transmission connection with all three components. This design allows a single slider 150 to coordinate and control the folding action of the entire frame, effectively replacing the complex linkage network commonly found in strollers 100 in related technologies, significantly simplifying the frame structure and reducing the number of parts and cost.

[0034] In some embodiments, the pivot 140 may have a layered structure, comprising a first pivot 141, a second pivot 142, and a third pivot 143. The first pivot 141 is fixedly connected to the rider assembly 110, the second pivot 142 is fixedly connected to the front leg assembly 120, and the third pivot 143 is fixedly connected to the rear leg assembly 130. These three pivots are arranged in a stacked manner and form a compact rotational pivot through coaxial hinge.

[0035] In some embodiments, the slider 150 may be disposed on the first pivot joint 141, which may be a cylindrical structure and extend axially along the pivot joint. The second pivot joint 142 is machined with a long groove 1420 of a specific length, which extends radially and has opposing first ends 1421 and second ends 1422, wherein the first end 1421 is closer to the common pivot point O than the second end 1422. The third pivot joint 143 is provided with a cooperating first arcuate groove 1430, which is bent downwards and has opposing first ends 1431 and second ends 1432, wherein the first end 1431 of the first arcuate groove 1430 is further away from the common pivot point O than the second end 1432. The slider 150 passes through the long groove 1420 and is inserted into the first arcuate groove 1430. The sliding path of the slider 150 within the first arc-shaped groove 1430 and the long groove 1420 provides precise guidance for the relative movement of the front leg assembly 120 and the rider assembly 110, ensuring that each assembly moves along a predetermined trajectory. Furthermore, when the slider 150 moves to the end positions of the first arc-shaped groove 1430 and the long groove 1420, it effectively acts as a mechanical limiter, preventing excessive rotation of the components and ensuring that the trolley is stably locked in both the unfolded and folded states.

[0036] It should be noted that the common pivot point O is located at the rotation axis of the pivot seat 140, specifically manifested as the central pin or rivet point that runs through the first pivot joint 141, the second pivot joint 142 and the third pivot joint 143. This pivot point O is the rotation center of the entire vehicle body main frame, and all components rotate relative to this pivot point.

[0037] In addition, the center of the first arc-shaped groove 1430 is located below the common pivot point O, causing its arc-shaped convex side to bend downwards toward the trolley. This bending direction matches the downward rotation trajectory of the front leg assembly 120 when folded.

[0038] It is understandable that the positions of the sliding member 150 in each channel have a clear correspondence in different states of the trolley: when the trolley is fully unfolded and in use, the sliding member 150 is simultaneously located at the first end 1431 of the first arc-shaped channel 1430 and the second end 1422 of the long channel 1420; when the trolley is fully folded, the sliding member 150 moves to the second end 1432 of the first arc-shaped channel 1430 and the first end 1421 of the long channel 1420. This precise positional correspondence ensures the coordination of the movement of each component and the accuracy of the final position during the folding process.

[0039] In some embodiments, to enhance the adaptability and adjustability of the product, a second arcuate groove 1410 is further provided on the first pivot joint 141. This second arcuate groove 1410 has opposing first ends 1411 and second ends 1412, wherein the first end 1411 is closer to the common pivot point than the second end 1412. A slider 150 is slidably inserted into the second arcuate groove 1410 and can be selectively locked at different positions within the second arcuate groove 1410. The center of the second arcuate groove 1410 is located above the common pivot point O, causing its arcuate convex side to curve upwards toward the trolley, a curvature that matches the upward rotation trajectory of the handlebar assembly 110 during folding.

[0040] It is understandable that the slider 150, positioned within the second arc-shaped groove 1410, also serves a dual function of path guidance and limiting. That is, it provides an accurate trajectory for the rotation of the rider assembly 110 and achieves precise control of the rotation angle through locking at different positions. When the trolley is unfolded into its usable state, the slider 150 is located at the second end 1412 of the second arc-shaped groove 1410; when the trolley is fully folded, the slider 150 moves to the first end 1411 of the second arc-shaped groove 1410. By adjusting the fixed position of the slider 150 within the second arc-shaped groove 1410, the relative rotation angle range between the rider assembly 110 and the pivot seat 140 can be changed, thus allowing the same pivot seat 140 to be adapted to different trolley models.

[0041] In some alternative embodiments, the second pivot joint 142 has symmetrically arranged convex shafts on both sides, while the first pivot joint 141 and the third pivot joint 143 have corresponding connecting grooves machined on them. Through the precise insertion and engagement of the convex shafts and connecting grooves, the three pivot joints achieve a stable coaxial connection. This connection method effectively ensures the positional accuracy of the common pivot point, allowing each component to maintain the correct relative positional relationship during rotation.

[0042] It should be noted that the components of the pivot seat 140 can be made of different material combinations. For example, the first pivot joint 141, the second pivot joint 142, and the third pivot joint 143 can be made of high-strength engineering plastics, while the sliding member 150 and the cam shaft can be made of metal to improve wear resistance and service life. The surfaces of each arc groove and connecting groove can be specially treated, such as by adding a lubricating coating or a wear-resistant layer, to reduce frictional resistance and extend service life.

[0043] In addition, the pivot 140 is equipped with a specially designed outer cover 148, which is installed on the outside of the first pivot joint 141 and / or the third pivot joint 143. The cover 148 is fixed by snaps or screws, which can effectively prevent dust, moisture and other foreign objects from entering the interior of the pivot 140 and affecting the normal operation of the moving mechanism, and also give the trolley a cleaner and more beautiful appearance.

[0044] In some optional embodiments, the pivot 140 further includes a first protrusion 144, a second protrusion 145, and corresponding first arcuate grooves 146 and second arcuate grooves 147. The first arcuate grooves 146 and 147 are respectively disposed on opposite sides of the second pivot 142, while the first protrusions 144 and 145 are correspondingly disposed on the rider assembly 110 and the front leg assembly 120. The first arcuate groove 146 has opposite first ends 1460 and 1461, and the second arcuate groove 147 also has opposite first ends 1460 and 1471.

[0045] It should be noted that the first arc-shaped groove 146 and the second arc-shaped groove 147 have the same structure, and the center of both coincides with the common pivot point O, forming a symmetrical arc trajectory centered on the pivot point O. This concentric design ensures that the movement trajectory of the first protrusion 144 within the first arc-shaped groove 146 is completely synchronized with the rotation of the rider assembly 110, and the movement trajectory of the second protrusion 145 within the second arc-shaped groove 147 is completely matched with the rotation of the front leg assembly 120.

[0046] The design of the first arc-shaped groove 146 and the second arc-shaped groove 147 being concentric with the common pivot point O ensures that the moving parts of the trolley maintain precise synchronization during unfolding and folding. The sliding trajectory of the first protrusion 144 within the first arc-shaped groove 146 is completely consistent with the rotation trajectory of the handlebar assembly 110, and the sliding trajectory of the second protrusion 145 within the second arc-shaped groove 147 is completely consistent with the rotation trajectory of the front leg assembly 120. This precise motion coordination not only provides accurate motion guidance but also significantly improves the structural stability of the trolley in the unfolded state.

[0047] In another alternative embodiment, the first arc-shaped groove 146 and the second arc-shaped groove 147 may be designed with different center positions. For example, the center of the first arc-shaped groove 146 may be slightly higher than the common pivot point, and the center of the second arc-shaped groove 147 may be slightly lower than the common pivot point O. This asymmetrical design can optimize the movement trajectory of each component during the folding process, achieving a more compact folding effect.

[0048] In another alternative embodiment, the arc angles of the first arc-shaped groove 146 and the second arc-shaped groove 147 can be adjusted as needed. For example, the arc angles can be set to different values ​​within the range of 90° to 120° to accommodate the folding requirements of different trolley models. This adjustable arc angle design enhances the versatility and adaptability of the pivot 140.

[0049] It should be noted that the various groove structures described above can be used individually or in combination as needed. For example, a concentric groove design can be used to ensure synchronized movement, while the folding space can be optimized by adjusting the arc angle. The surfaces of each groove can be specially treated, such as by adding a self-lubricating coating or a wear-resistant layer, to reduce frictional resistance and extend service life.

[0050] Furthermore, when the trolley is unfolded into its usable state, the first protrusion 144 is tightly engaged with the first end 1460 of the first arc-shaped groove 146, and the second protrusion 145 is simultaneously engaged with the second end 1471 of the second arc-shaped groove 147, forming a stable limiting system. During the folding process, each protrusion slides smoothly within its corresponding arc-shaped groove. Finally, in the fully folded state, the first protrusion 144 moves to the second end 1461 of the first arc-shaped groove 146, and the second protrusion 145 moves to the first end 1470 of the second arc-shaped groove 147. This precise end-point correspondence not only ensures structural stability in the usable state but also provides reliable guidance and limiting for the folding process.

[0051] In some embodiments, two of each of the first protrusion 144, the second protrusion 145, the first arc-shaped groove 146, and the second arc-shaped groove 147 are used and symmetrically arranged around a common pivot point to form a completely symmetrical limiting structure. The symmetrically distributed protrusions and grooves enable uniform load distribution, effectively preventing localized wear caused by uneven loading and significantly improving service life. Furthermore, the double-protrusion and double-groove structure provides dual limiting protection; even if one side malfunctions, the other side can still maintain normal function, greatly enhancing the system's reliability. Moreover, the symmetrical layout ensures force balance among components during movement, effectively avoiding jamming and making the folding action smoother and more stable.

[0052] In some embodiments, to achieve coordinated movement between the rider assembly 110 and the rear leg assembly 130, the trolley is also provided with a support member 160. The two ends of the support member 160 are hinged to the rider assembly 110 and the rear leg assembly 130, respectively. During folding, the support member 160 not only transmits movement but also effectively maintains the structural stability of the frame.

[0053] In some embodiments, the stroller 100 further includes a seat assembly 170 and an elastic element 180. The rear end of the seat assembly 170 is connected to the support member 160, and the front end is connected to the front leg assembly 120 via the elastic element 180. The elastic element 180 may be made of high-carbon steel support wire, which has good elasticity and fatigue strength. When the stroller 100 travels on uneven surfaces, the elastic element 180 can provide effective cushioning to the seat assembly 170 through its own elastic deformation, significantly improving riding comfort.

[0054] In some embodiments, the front leg assembly 120 may include a first front leg 121, a second front leg 122, and a connecting rod 123 connecting the two. The two front legs are spaced apart in a direction perpendicular to the trolley's direction of travel, forming a stable support base. The connecting rod 123 is laterally connected between the two front legs, effectively enhancing the structural rigidity of the front leg assembly 120 and preventing deformation or swaying during use. The bottom end of the elastic element 180 is directly connected to the connecting rod 123. This connection method not only improves the reliability of the connection but also allows the elastic support force to be evenly distributed throughout the entire front leg system.

[0055] In addition to the embodiments described above, those skilled in the art can make various modifications and improvements based on the concept of this application. For example, the sliding member 150 can adopt a non-circular cross-section, such as an ellipse or polygon, to enhance its fitting accuracy with the channel; the stacked structure of the pivot seat 140 can use different numbers of pivot joints to adapt to more complex vehicle model requirements; the elastic member 180 can also use other elastic elements such as helical springs or gas springs to replace the support wire; furthermore, the specific shape and size of each channel can be optimized and adjusted according to different folding requirements. These modifications are all within the protection scope of this application.

[0056] In summary, this application successfully simplifies the structure of the stroller 100 and optimizes its folding performance by employing a pivot seat 140 transmission system centered on the slider 150. By precisely defining the positional changes of the slider 150 between the endpoints of each channel and the movement trajectory of the protrusion between the endpoints of the arc-shaped groove, a reliable unfolding locking mechanism and folding guide system are established. This design not only significantly reduces the number of parts and lowers production costs, but also makes the stroller smaller when folded, greatly improving the product's portability and ease of use.

[0057] In the description of this specification, references to terms such as "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. A stroller, characterized in that, The vehicle includes a rider assembly, a front leg assembly, a rear leg assembly, a pivot seat, and a sliding member. The rider assembly, the front leg assembly, and the rear leg assembly converge at the pivot seat and are hinged at the pivot seat to form the main frame of the vehicle body. The sliding member is disposed on the pivot seat and extends along the rotation axis of the pivot seat to be drive-connected to the rider assembly, the front leg assembly, and the rear leg assembly.

2. The stroller of claim 1, wherein, The pivot joint includes a first pivot joint, a second pivot joint, and a third pivot joint. The first pivot joint is connected to the rider assembly, the second pivot joint is connected to the front leg assembly, and the third pivot joint is connected to the rear leg assembly. The first pivot joint, the second pivot joint, and the third pivot joint are stacked and coaxially hinged.

3. The stroller of claim 2, wherein, The sliding member is disposed on the first pivot joint, the second pivot joint is provided with a long groove, and the third pivot joint is provided with a first arc-shaped groove corresponding to the long groove. The sliding member passes through the long groove and is inserted into the first arc-shaped groove.

4. The stroller of claim 3, wherein, The first pivot joint is provided with a second arc-shaped groove, and the sliding member is adjustablely disposed in the second arc-shaped groove.

5. The stroller of claim 2, wherein, The second pivot joint has protruding shafts on both sides, and the first pivot joint and the third pivot joint have corresponding connecting grooves. The protruding shafts are inserted into the connecting grooves to coaxially hinge the first pivot joint, the second pivot joint and the third pivot joint.

6. The stroller of any one of claims 2 to 5, wherein, The pivot joint also includes an outer cover, which is located on the side of the first pivot joint and / or the third pivot joint away from the second pivot joint.

7. The stroller of any one of claims 2 to 5, wherein, The pivot seat further includes a first protrusion, a second protrusion, a first arc-shaped groove, and a second arc-shaped groove. The first arc-shaped groove and the second arc-shaped groove are respectively disposed on opposite sides of the second pivot joint. The first protrusion is disposed on the rider assembly and is received in the first arc-shaped groove. The second protrusion is disposed on the front leg assembly and is received in the second arc-shaped groove.

8. The stroller of claim 1, wherein, The trolley also includes a support member that is hinged to the rider assembly and the rear leg assembly.

9. The stroller of claim 8, wherein, The stroller also includes a seat assembly and an elastic element. The rear end of the seat assembly is connected to the support element, and the front end of the seat assembly is connected to the front leg assembly via the elastic element.

10. The stroller of claim 9, wherein, The front leg assembly includes a first front leg, a second front leg, and a connecting rod. The first front leg and the second front leg are spaced apart along the rotation axis of the pivot seat, and the connecting rod is located between the first front leg and the second front leg. The elastic element is located between the seat assembly and the connecting rod.