Stroller

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 support assembly and a first connecting member. One end of the support assembly is hingedly connected to the handle assembly to form a first hinged position. The other end of the support assembly is hingedly connected to the rear leg assembly to form a second hinged position. One end of the first connecting member is hingedly connected to the support assembly to form a third hinged position. The other end of the first connecting member is hingedly connected to the front leg assembly to form a fourth hinged position. The baby stroller has an unfolded use state and a folded storage state. In the unfolded use state, the second hinged position, the third hinged position and the fourth hinged position are on the same straight line, and the first hinged position is above the second hinged position. In the folded storage state, the first hinged position is below the third hinged position, and the third hinged position is above the second hinged position and the fourth hinged position. The baby stroller has the advantages of simplified structure, light weight and convenient operation.

Description

Technical Field

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

[0002] In real society, with increasingly convenient transportation and well-developed urban facilities, more and more families are willing to bring their infants and toddlers, and correspondingly, strollers have become an essential tool for these families.

[0003] However, to achieve the folding function, most baby strollers in related technologies employ complex multi-link structures. These structures contain too many connecting rods, hinge points, and auxiliary components, resulting in a bulky and heavy overall frame that does not meet the current market demand for lightweight strollers. Furthermore, the numerous components increase the steps involved in the folding operation, affecting ease of use. Utility Model Content

[0004] The purpose of this application is to solve the problems of bulky overall frame structure, excessive weight, and complicated folding operation of baby strollers in related technologies.

[0005] This application provides a baby stroller, including a handle assembly, a front leg assembly, and a rear leg assembly. The handle assembly, the front leg assembly, and the rear leg assembly are hinged to form a main frame. The baby stroller also includes a support assembly and a first linkage. One end of the support assembly is hinged to the handle assembly to form a first hinge position; the other end of the support assembly is hinged to the rear leg assembly to form a second hinge position; one end of the first linkage is hinged to the support assembly to form a third hinge position; the other end of the first linkage is hinged to the front leg assembly to form a fourth hinge position. The baby stroller has an unfolded use state and a folded storage state. In the unfolded use state, the second, third, and fourth hinge positions are on the same straight line, and the first hinge position is located above the second hinge position. In the folded storage state, the first hinge position is located below the third hinge position, and the third hinge position is located above the second and fourth hinge positions.

[0006] In one exemplary embodiment of this application, the hand assembly, the front leg assembly, and the rear leg assembly converge and are hinged at a pivot point of the main frame of the stroller. The stroller also includes a limiting assembly configured to limit the rotation angle of the hand assembly, the front leg assembly, and the rear leg assembly at the pivot point in the unfolded use state.

[0007] In an exemplary embodiment of this application, the limiting component includes a first protrusion, a second protrusion, a first arc-shaped limiting groove, and a second arc-shaped limiting groove. The first arc-shaped limiting groove and the second arc-shaped limiting groove are respectively disposed on opposite sides of the rear leg component. The first protrusion is disposed on the rider component and received in the first arc-shaped limiting groove. The second protrusion is disposed on the front leg component and received in the second arc-shaped limiting groove.

[0008] In one exemplary embodiment of this application, there are two first protrusions and two first arc-shaped limiting grooves. One first protrusion is inserted into one first arc-shaped limiting groove, and the two first arc-shaped limiting grooves are symmetrically arranged at the pivot point. There are two second protrusions and two second arc-shaped limiting grooves. One second protrusion is inserted into one second arc-shaped limiting groove, and the two second arc-shaped limiting grooves are symmetrically arranged at the pivot point.

[0009] In one exemplary embodiment of this application, the support assembly includes a support member and a first connector. One end of the support member is hinged to the rider assembly, and the other end is connected to the first connector. The first connector is hinged to the rear leg assembly, and the end of the first connector away from the support member is hinged to the first linkage member.

[0010] In one exemplary embodiment of this application, the thickness of the first connector is greater than the thickness of the support member; and / or, the first connector and the support member are integrally formed.

[0011] In one exemplary embodiment of this application, the support component further includes a second connector, the support component being hinged to the rider component via the second connector.

[0012] In one exemplary embodiment of this application, the stroller further includes a seat assembly and an elastic element, the rear end of the seat assembly being hinged to the support assembly, and the front end of the seat assembly being connected to the front leg assembly via the elastic element.

[0013] In one exemplary embodiment of this application, the stroller further includes a handlebar assembly and a second linkage, the handlebar assembly being hinged to the handlebar assembly, and the suspended tail end of the handlebar assembly being hinged to the support assembly via the second linkage.

[0014] In one exemplary embodiment of this application, the rider assembly includes an articulated upper rider and a lower rider, with one end of the lower rider away from the upper rider hinged to the junction of the front leg assembly and the rear leg assembly; the support assembly is hinged to the inside of the hinge junction of the upper rider and the lower rider.

[0015] The baby stroller proposed in this application has at least the following beneficial effects: The stroller disclosed in this application includes a handlebar assembly, a front leg assembly, a rear leg assembly, a support assembly, and a first linkage. By setting the support assembly and the first linkage, and precisely defining their four hinge positions with the handlebar assembly, front leg assembly, and rear leg assembly, a streamlined and efficient linkage system is constructed. In the unfolded state, the stroller utilizes the three points aligned by the second, third, and fourth hinge positions to form a stable triangular support effect, ensuring sufficient rigidity and stability of the frame for safe use. When transitioning to the folded storage state, the front and rear leg assemblies are driven to move closer together. The first linkage is pulled through the fourth hinge position, and the first linkage then applies a pulling or pushing force to the support assembly through the third hinge position, causing the support assembly to rotate around the first hinge position as its axis of rotation. Simultaneously, the second hinge position at the lower end of the support assembly is pushed by the rear leg assembly, resulting in displacement and thus achieving the folded storage state of the stroller. This design achieves structural simplification, weight reduction, ease of operation, and optimized folding volume with minimal components, reducing the problems of bulky, heavy, and complex operation of baby strollers in related technologies.

[0016] 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.

[0017] 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

[0018] 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.

[0019] Figure 1 A schematic diagram of the baby stroller provided in some embodiments in its unfolded and usable state is shown.

[0020] Figure 2 An exploded view of the limiting component provided in some embodiments is shown.

[0021] Figure 3 An exploded view of the limiting component provided in some embodiments is shown.

[0022] Figure 4 A cross-sectional structural schematic diagram of a first protrusion disposed at the first end of a first arc-shaped limiting groove is shown in some embodiments.

[0023] Figure 5 A cross-sectional structural schematic diagram of the second protrusion provided at the fourth end of the second arc-shaped limiting groove is shown in some embodiments.

[0024] Figure 6 A schematic diagram of the stroller provided in some embodiments in a folded storage state is shown.

[0025] Explanation of reference numerals in the attached figures: 10. Baby stroller; 100. Handler assembly; 110. Getting on handler; 120. Getting off handler; 200. Front leg assembly; 300. Rear leg assembly; 400. Support assembly; 410. Support member; 420. First connector; 430. Second connector; 500. First linkage; 600a. First hinge position; 600b. Second hinge position; 600c. Third hinge position; 600d. Fourth hinge position; 700. Pivot point; 800. Limiting assembly; 810. First protrusion; 820. Second protrusion; 830. First arc-shaped limiting groove; 831. First end; 832. Second end; 840. Second arc-shaped limiting groove; 841. Third end; 842. Fourth end; 900. Seat assembly; 1000. Elastic member; 1100. Armrest assembly; 1200. Second linkage. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] See Figure 1 As shown in the figure, this application embodiment provides a baby stroller 10, which may include a handle assembly 100, a front leg assembly 200, a rear leg assembly 300, a support assembly 400, and a first linkage 500. These components are connected to each other by hinges to form an efficient, stable, and lightweight stroller structure.

[0031] Please continue to see Figure 1 As shown, the rider assembly 100, the front leg assembly 200 and the rear leg assembly 300 are hinged to each other, and the components can work together to form the main frame of the stroller 10.

[0032] In some embodiments, with the direction of propulsion of the stroller 10 as the front and rear sides, the support assembly 400 may be located on the rear side of the main frame of the stroller. Please continue to see Figure 1 As shown, one end of the support component 400 is hinged to the rider component 100 to form a first hinge position 600a, and the other end is hinged to the rear leg component 300 to form a second hinge position 600b. This connection method allows the support component 400 to effectively transfer loads in the unfolded state, transmitting the pressure borne by the rider component 100 to the rear leg component 300 through a reasonable force distribution, ensuring the stability of the overall stroller structure. Simultaneously, the support component 400 also plays a crucial role in guiding and coordinating the movement of various components during the folding process.

[0033] In some embodiments, please continue to see Figure 1 As shown, one end of the first linkage 500 is hinged to the support assembly 400 to form a third hinge position 600c, and the other end is hinged to the front leg assembly 200 to form a fourth hinge position 600d. This design allows the first linkage 500 to accurately transmit the movement of the front leg assembly 200 to the support assembly 400 during the trolley state transition, thereby driving the entire frame to complete the folding or unfolding action.

[0034] Understandably, the specific positional relationship of the four hinge points constitutes the geometric constraints of the trolley's movement, ensuring that the movement trajectory of each component is clear and reliable.

[0035] The baby stroller 10 has an unfolded use state and a folded storage state, which are achieved through the coordinated operation of various components.

[0036] Please continue reading Figure 1 As shown, in the unfolded state, the second hinge point 600b, the third hinge point 600c, and the fourth hinge point 600d are aligned on a straight line. This three-point alignment forms a stable triangular support structure, ensuring that the frame has sufficient rigidity and stability to guarantee safe use. At this time, the first hinge point 600a is located above the second hinge point 600b, and the support assembly 400 is in an inclined extended state, providing the main support force for the frame.

[0037] In the folded storage state, when the front leg assembly 200 and the rear leg assembly 300 are driven to move closer together, the first linkage 500 is pulled through the fourth hinge position 600d. The first linkage 500 then applies a pulling or pushing force to the support assembly 400 through the third hinge position 600c, so that the support assembly 400 rotates around the first hinge position 600a as the rotation axis. At the same time, the second hinge position 600b at the lower end of the support assembly 400 is pushed by the rear leg assembly 300 and thus displaced.

[0038] Understandably, the relative positions of the hinges change when the bike is folded and stowed. The first hinge 600a moves below the third hinge 600c, while the third hinge 600c is above the second hinge 600b and the fourth hinge 600d. This arrangement of hinges causes the rider assembly 100 to sink downwards into the frame space formed by the folded front and rear leg assemblies 300. Through the three-dimensional interlocking of the components, rather than simple side-by-side arrangement, extreme compression of the stowed volume is achieved. Simultaneously, this positional relationship concentrates the center of gravity of each component in the vertical direction, forming a stable, low-center-of-gravity binding structure to prevent loosening. Furthermore, the positional relationship of the hinges optimizes the rotation trajectory of the support assembly 400 and the pulling motion of the first linkage 500, ensuring that the components fold sequentially and reducing motion interference and component collisions.

[0039] In some embodiments, see Figure 1 , Figure 2 or Figure 3 As shown, the rider assembly 100, the front leg assembly 200, and the rear leg assembly 300 converge and hinge at the pivot point 700 of the main frame of the vehicle. This design allows the three assemblies to rotate in a coordinated manner around the pivot point 700, forming the main moving skeleton of the trolley.

[0040] In some embodiments, see Figure 1 , Figure 2 or Figure 3As shown, the stroller 10 may also include a limiting component 800. This limiting component 800 is configured to restrict the rotation angle of the rider assembly 100, front leg assembly 200, and rear leg assembly 300 at the pivot point 700 when the stroller is in the unfolded state. By simultaneously locking the positions of the three main components in the unfolded state through a single limiting mechanism, the overall rigid support and stable load-bearing capacity of the stroller frame are achieved with the most streamlined structure.

[0041] In some embodiments, see Figures 2 to 5 As shown, the limiting component 800 may include a first protrusion 810, a second protrusion 820, a first arc-shaped limiting groove 830, and a second arc-shaped limiting groove 840. The first arc-shaped limiting groove 830 and the second arc-shaped limiting groove 840 are respectively located on opposite sides of the rear leg component 300. The first protrusion 810 is located on the rider component 100, and the second protrusion 820 is located on the front leg component 200. The first protrusion 810 is received within the first arc-shaped limiting groove 830, and the second protrusion 820 is received within the second arc-shaped limiting groove 840.

[0042] Understandably, by providing a first arc-shaped limiting groove 830 and a second arc-shaped limiting groove 840 on opposite sides of the rear leg assembly 300, and having them slide into contact with the first protrusion 810 on the rider assembly 100 and the second protrusion 820 on the front leg assembly 200 respectively, an automatic locking mechanism based on geometric constraints is constructed. When the trolley is unfolded, the two protrusions can slide along their respective arc-shaped grooves, forming a stable couple-type lock at the pivot point 700 using the arc-shaped groove and protrusion structure. This simple and reliable structure synchronously restricts the rotation of the three major components in the unfolded state, ensuring the overall rigidity and load-bearing safety of the frame while reducing the introduction of additional complex locking mechanisms, achieving a balance between lightweight and high stability. It also limits the over-unfolding of the body assembly, front leg assembly 200, and rear leg assembly 300, improving stress distribution and enhancing frame stability.

[0043] In some embodiments, see Figures 2 to 5 As shown, the first arc-shaped limiting groove 830 has a first end 831 and a second end 832 distributed along its arc trajectory, and the second arc-shaped limiting groove 840 has a third end 841 and a fourth end 842 distributed along its arc trajectory. The first end 831 and the third end 841 correspond to each other on the same side of the rear leg assembly 300, while the second end 832 and the fourth end 842 correspond to each other on the other side. Furthermore, the first end 831 of the first arc-shaped limiting groove 830 and the fourth end 842 of the second arc-shaped limiting groove 840 are located at the farthest points on opposite sides of the rear leg assembly 300.

[0044] It should be noted that, please refer to Figure 4 and Figure 5As shown, when the trolley is unfolded into its working state, the first protrusion 810 is precisely engaged with the first end 831 of the first arc-shaped limiting groove 830, while the second protrusion 820 is engaged with the fourth end 842 of the second arc-shaped limiting groove 840. At this time, the two protrusions are symmetrically distributed in space on both sides of the rear leg assembly 300.

[0045] Understandably, the symmetrical locking points formed by the first protrusion 810 and the second protrusion 820 on both sides of the rear leg assembly 300 construct a torque action mechanism centered on the pivot point 700. When the frame bears a load, the force acting on the rider assembly 100 and the front leg assembly 200 is transmitted through the two protrusions to the first end 831 of the first arc-shaped limiting groove 830 and the fourth end 842 of the second arc-shaped limiting groove 840, respectively. The reaction forces at these two endpoints form a pair of torques of equal magnitude and opposite direction, effectively resisting the torque that causes the frame to fold. This torque-type locking not only greatly enhances the stability of the frame in the unfolded state, but also avoids stress concentration on one side through symmetrically distributed force points, significantly improving the trolley's load-bearing capacity and safety, while ensuring the reliability and durability of the locked state.

[0046] It is worth mentioning that the limiting component 800 is not limited to the above-mentioned cooperation method of the protrusion and the arc-shaped limiting groove. In other embodiments of this application, the limiting component 800 may also adopt a cooperation structure of a retractable spring pin and a positioning hole.

[0047] For example, a spring pin can be provided on the rear leg assembly 300, and corresponding positioning holes can be provided on the handlebar assembly 100 and the front leg assembly 200. When the trolley is unfolded into the use state, the spring pin automatically pops out under the action of spring force and simultaneously engages with the positioning holes on the handlebar assembly 100 and the front leg assembly 200. This radial pin-type locking mechanism directly restricts the relative rotation of the three major components at the pivot point 700.

[0048] In some embodiments, see Figure 2 and Figure 3 As shown, there are two first protrusions 810 and two first arc-shaped limiting grooves 830. One first protrusion 810 is inserted into one first arc-shaped limiting groove 830, and the two first arc-shaped limiting grooves 830 are symmetrically arranged at the pivot point 700. Similarly, there are two second protrusions 820 and two second arc-shaped limiting grooves 840. One second protrusion 820 is inserted into one second arc-shaped limiting groove 840, and the two second arc-shaped limiting grooves 840 are symmetrically arranged at the pivot point 700. This double symmetrical design allows the trolley to withstand a greater load when unfolded, further enhancing the structural stability and force balance, and ensuring safe use.

[0049] In some embodiments, the limiting component 800 may further include an outer cover. The outer cover is securely attached to the outside of the front leg assembly 200 by a snap-fit ​​connection or screws. Furthermore, the outer cover may be a streamlined housing that matches the outer contour of the front leg assembly 200. The outer cover covering the outside of the front leg assembly 200 enhances the overall bending stiffness of that area. Moreover, the streamlined design of the outer cover makes the stroller appear more complete and aesthetically pleasing.

[0050] In some embodiments, see Figure 1 As shown, the support assembly 400 includes a support member 410 and a first connector 420. The support member 410 can be a slender straight rod or a slightly curved rod. One end of the support member 410 is hinged to the rider assembly 100, and the other end is connected to the first connector 420. The first connector 420 can be an L-shaped rod structure. The first connector 420 is hinged to the rear leg assembly 300, and the end of the first connector 420 away from the support member 410 is hinged to the first linkage 500. By designing the support member 410 and the first connector 420 in segments, structural optimization is achieved. At the same time, the first connector 420 integrates the three moving parts—the support member 410, the rear leg assembly 300, and the first linkage 500—allowing the support assembly 400 to efficiently coordinate the movement of each part during the transition between the pushcart and other states.

[0051] Understandably, when the stroller 10 is folded, the front leg assembly 200 pulls the first connecting member 420 via the first linkage 500. The first connecting member 420 then drives the support member 410 to rotate around its hinge point with the handlebar assembly 100, thus orderly transmitting the folding action to the entire frame. In the unfolded state, the load from the handlebar assembly 100 is transmitted to the first connecting member 420 via the support member 410, and then distributed to the rear leg assembly 300 and the first linkage 500, forming a stable triangular force system. This scientific force distribution significantly improves the overall rigidity and stability of the frame, making the stroller deform less when carrying loads and easier to push.

[0052] In some embodiments, the first connector 420 serves as the main power transmission hub, and its thickness can be greater than that of the support member 410. As the core node in the support assembly 400 that simultaneously connects the support member 410, the rear leg assembly 300, and the first linkage member 500, the thickened structural design of the first connector 420 enables it to withstand composite stresses from multiple directions, effectively reducing fatigue failure caused by stress concentration. Simultaneously, the support member 410 can maintain a relatively thin and lightweight design, achieving an optimized material distribution where thicker areas are thicker and thinner areas are thinner.

[0053] In some embodiments, the first connector 420 and the support member 410 can be integrally formed. By employing an integral forming process, the first connector 420 and the support member 410 reduce the use of bolts, rivets, and other connecting parts found in traditional connection methods. This not only reduces the overall weight but, more importantly, reduces movement play caused by connection gaps, ensuring the accuracy of the trolley's movement trajectory during folding and unfolding. Furthermore, the integrally formed structure allows for more continuous and smooth force transmission. The load transmitted from the support member 410 can be smoothly distributed to the rear leg assembly 300 and the first linkage member 500, significantly improving the rigidity and stability of the entire support system.

[0054] In other embodiments, the first connector 420 and the support 410 can also be formed separately. For example, the first connector 420 has a connecting hole that matches the outer diameter of the support 410, allowing it to be tightly fitted onto the outer side of the lower end of the support 410. By employing a separate forming process, the support 410 and the first connector 420 can be manufactured separately and then assembled, reducing processing difficulty and production costs. During use, if partial damage occurs, only the corresponding component needs to be replaced, greatly simplifying the maintenance process.

[0055] In some embodiments, see Figure 1 As shown, the support assembly 400 also includes a second connector 430. The second connector 430 adopts an S-shaped curve structure, with its upper end connected to the rider assembly 100 via a hinge shaft, and its lower end connected to the top of the support assembly 410 via rivets, screws, or a pivot shaft. The second connector 430 ensures a reliable connection between the support assembly 400 and the rider assembly 100, guaranteeing the structural stability of the trolley in its unfolded state. Furthermore, the modular connection allows for independent adjustment of the angle and position of the support assembly 400, providing greater design freedom. In addition, the second connector 430 ensures both strength and flexibility in folding movements, making the movement of each component more coordinated and smooth during state transitions.

[0056] Understandably, during the folding and unfolding of the stroller, the S-shaped curve structure of the second connector 430 effectively reduces interference in the movement trajectory between the support component 400 and the rider component 100, front leg component 200, etc., ensuring smooth and unobstructed movement. Furthermore, the S-shaped curve structure of the second connector 430 allows the force exerted by the rider component 100 to be transmitted to the support component 410 at a more optimal angle and lever arm, thereby improving the efficiency of force transmission and enhancing the structural rigidity of the stroller in its unfolded state.

[0057] In some embodiments, see Figure 1As shown, the stroller 10 also includes a seat assembly 900 and an elastic element 1000. The combined design of the seat assembly 900 and the elastic element 1000 provides a comfortable riding experience for the stroller. The hinged connection between the rear end of the seat assembly 900 and the support assembly 400, and the connection between the front end of the seat assembly 900 and the front leg assembly 200 via the elastic element 1000, allow the seat to automatically move when the stroller is switched between different positions. Simultaneously, the deformation of the elastic element 1000 absorbs vibrations during pushing, providing excellent cushioning. This design ensures functional integrity without increasing operational complexity.

[0058] In some embodiments, the elastic element 1000 may be made of wire or a structure such as a helical spring or a torsion spring.

[0059] In some embodiments, see Figure 1 As shown, the stroller 10 also includes a handlebar assembly 1100 and a second linkage 1200, which further enhance the stroller's ease of use. The bottom of the handlebar assembly 1100 is connected to the rider assembly 100 via a hinge shaft, allowing them to rotate relative to each other; the suspended, movable end of the handlebar assembly 1100 is hinged to the upper middle part of the support assembly 400 via the second linkage 1200. This structural design constitutes a complete four-bar linkage, in which the rider assembly 100, support assembly 400, second linkage 1200, and handlebar assembly 1100 together form a closed kinematic chain.

[0060] Understandably, when the stroller is folded or unfolded, the movement of the support assembly 400 is precisely transmitted to the armrest assembly 1100 via the second linkage 1200, causing the armrest assembly 1100 to automatically fold or unfold synchronously with the main frame. Users do not need to perform any additional operations on the armrest, greatly improving ease of use. Furthermore, the second linkage 1200 establishes an additional structural connection between the armrest assembly 1100 and the support assembly 400, transforming the armrest assembly 1100 from a purely decorative or load-bearing component into a structural member participating in the overall load-bearing process. This enhances the lateral stability of the top of the frame, making the overall structure more robust.

[0061] In some embodiments, see Figure 1 As shown, the rider assembly 100 may include an articulated upper rider arm 110 and a lower rider arm 120. The upper rider arm 110 and the lower rider arm 120 are connected to each other via a hinge shaft. The end of the lower rider arm 120 away from the upper rider arm 110 is hinged to the junction of the front leg assembly 200 and the rear leg assembly 300, forming a stable main triangular support structure. The upper end of the support assembly 400 is hinged to the inner side of the hinge point between the upper rider arm 110 and the lower rider arm 120 via a second connector 430.

[0062] By hinged the support assembly 400 to the inner side of the hinge joint between the upper handlebar 110 and the lower handlebar 120, the bending moment and torque generated by the frame during pushing are effectively decomposed. The upper handlebar 110 and the lower handlebar 120 can bear loads in different directions, greatly improving the frame's load-bearing capacity and torsional stiffness. The three-section hinge design allows the upper handlebar 110 to fold at an additional angle relative to the lower handlebar 120 during folding. Combined with the compact layout of the support assembly 400 hinged on the inner side, a smaller storage form is achieved. The design of the lower handlebar 120 directly connecting to the front and rear leg assemblies 300 allows the control force during pushing to be directly transmitted to the entire frame, avoiding force loss in the middle and providing a more precise and stable handling experience.

[0063] The stroller 10 transitions from its unfolded state to its folded state as follows: The user drives the front leg assembly 200 and rear leg assembly 300 to rotate relative to each other at the pivot point 700, bringing them closer together. The movement of the front leg assembly 200 pulls the first linkage 500 through the fourth hinge point 600d. The first linkage 500 then applies a pulling force to the support assembly 400 through the third hinge point 600c, causing the support assembly 400 to rotate and fold around the first hinge point 600a as an axis, while simultaneously causing the handrail assembly 100 to move downwards. During this process, the seat assembly 900, hinged to the support assembly 400, folds downwards synchronously, and the armrest assembly 1100, connected to the support assembly 400 through the second linkage 1200, is also pulled to rotate inwards and fold around its hinge point. The first protrusion 810, located on the rider assembly 100, slides along the first arc-shaped limiting groove 830 from the first end 831 to the second end 832, while the second protrusion 820, located on the front leg assembly 200, slides along the second arc-shaped limiting groove 840 from the fourth end 842 to the third end 841. The movement of the protrusions within the grooves is smooth and stable, without any jamming. Guided by the linkage mechanism, each component moves in a coordinated manner, ultimately achieving a folded and stowed state, such as... Figure 6 As shown.

[0064] The process of transforming the stroller from a folded storage state to an unfolded use state is the reverse of the above process: the user applies an unfolding force to the frame, causing the front leg assembly 200 and the rear leg assembly 300 to move away from each other. This pushes the first linkage 500 through the fourth hinge 600d, and the first linkage 500 applies a pushing force to the support assembly 400 through the third hinge 600c, causing the support assembly 400 to rotate in the opposite direction around the first hinge 600a as an axis, while simultaneously pushing the hand assembly 100 upward. During this process, the seat assembly 900 rises synchronously to a horizontal use position as the support assembly 400 unfolds, and the armrest assembly 1100 also automatically rotates back to a horizontal state under the push of the second linkage 1200. The first protrusion 810 slides along the first arc-shaped limiting groove 830 from the second end 832 to the first end 831, and the second protrusion 820 slides along the second arc-shaped limiting groove 840 from the third end 841 to the fourth end 842. When the trolley is fully extended, all hinge points return to their original positions for use, forming a stable support structure, such as... Figure 1 As shown.

[0065] This application replaces the complex multi-link mechanism used in related trolleys with two core components: the support assembly 400 and the first linkage 500, achieving a significant reduction in the number of components and overall weight. Furthermore, the arc-shaped limiting grooves on both sides of the rear leg assembly 300, in conjunction with corresponding protrusions, form a stable torque-type locking mechanism during unfolding, ensuring the rigidity and load-bearing safety of the frame. In addition, by directly hinged the seat assembly 900 to the support assembly 400 and using the second linkage 1200 to link the armrest assembly 1100 with the support assembly 400, the seat and armrests can automatically and synchronously move with the main frame during folding and unfolding, requiring no additional operation and greatly improving ease of use and compactness after folding. In other words, this application achieves multiple advantages simultaneously with a minimalist mechanical structure, including ease of operation, small storage volume, structural stability and reliability, and lightweight design.

[0066] 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.

[0067] 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 baby stroller, comprising a handlebar assembly, a front leg assembly, and a rear leg assembly, wherein the handlebar assembly, the front leg assembly, and the rear leg assembly are hinged to form a main frame, characterized in that, The stroller also includes a support assembly and a first linkage. One end of the support assembly is hinged to the handle assembly to form a first hinge position; the other end of the support assembly is hinged to the rear leg assembly to form a second hinge position; one end of the first linkage is hinged to the support assembly to form a third hinge position; and the other end of the first linkage is hinged to the front leg assembly to form a fourth hinge position. The stroller has an unfolded use state and a folded storage state. In the unfolded use state, the second hinge, the third hinge, and the fourth hinge are on the same straight line, and the first hinge is located above the second hinge. In the folded storage state, the first hinge is located below the third hinge, and the third hinge is located above the second and fourth hinges.

2. The baby stroller according to claim 1, characterized in that, The rider assembly, the front leg assembly, and the rear leg assembly meet and hinge at the pivot point of the main frame of the stroller. The stroller also includes a limiting assembly configured to restrict the rotation angle of the rider assembly, the front leg assembly, and the rear leg assembly at the pivot point in the unfolded use state.

3. The stroller of claim 2, wherein, The limiting component includes a first protrusion, a second protrusion, a first arc-shaped limiting groove, and a second arc-shaped limiting groove. The first arc-shaped limiting groove and the second arc-shaped limiting groove are respectively disposed on opposite sides of the rear leg component. The first protrusion is disposed on the rider component and is received in the first arc-shaped limiting groove. The second protrusion is disposed on the front leg component and is received in the second arc-shaped limiting groove.

4. The stroller of claim 3, wherein, Two first protrusions and two first arc-shaped limiting grooves are provided. One first protrusion is inserted into one first arc-shaped limiting groove, and the two first arc-shaped limiting grooves are symmetrically arranged at the pivot point. Two second protrusions and two second arc-shaped limiting grooves are provided. One second protrusion is inserted into one second arc-shaped limiting groove, and the two second arc-shaped limiting grooves are symmetrically arranged at the pivot point.

5. The baby stroller according to claim 1, characterized in that, The support assembly includes a support member and a first connector. One end of the support member is hinged to the rider assembly, and the other end is connected to the first connector. The first connector is hinged to the rear leg assembly, and the end of the first connector away from the support member is hinged to the first linkage member.

6. The stroller of claim 5, wherein, The thickness of the first connector is greater than the thickness of the support member; and / or, The first connector and the support are integrally formed.

7. The baby stroller according to claim 5, characterized in that, The support assembly further includes a second connector, through which the support assembly is hinged to the rider assembly.

8. The baby stroller according to claim 1, characterized in that, The stroller also includes a seat assembly and an elastic element, the rear end of which is hinged to the support assembly, and the front end of which is connected to the front leg assembly via the elastic element.

9. The baby stroller according to claim 1, characterized in that, The stroller also includes a handlebar assembly and a second linkage. The handlebar assembly is hinged to the handlebar assembly, and the suspended end of the handlebar assembly is hinged to the support assembly via the second linkage.

10. The baby stroller according to claim 1, characterized in that, The rider assembly includes an articulated upper rider and a lower rider, with the end of the lower rider away from the upper rider hinged to the junction of the front leg assembly and the rear leg assembly; the support assembly is hinged to the inside of the hinge junction of the upper rider and the lower rider.

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