Collapsible stroller

Abstract

A collapsible stroller (100), comprising a stroller main frame (10), a first unfolding joint (20), a second unfolding joint (30), a front wheel assembly (40), a rear wheel assembly (50), a backrest frame (60), a first folding joint (70), a second folding joint (80), a handlebar frame (90), and an operation switch (90a). The operation switch (90a) has a locked state and an unlocked state. In the locked state, first unfolding joint members (20a), second unfolding joint members (30a), first folding joint members (70a), and second folding joint members (80a) all remain in an unfolded state, and the collapsible stroller (100) is in an in-use state; and in the unlocked state, the first unfolding joint members (20a), the second unfolding joint members (30a), the first folding joint members (70a), and the second folding joint members (80a) all remain in a folded state, and the collapsible stroller (100) is in a collapsed state. The device is convenient and labor-saving to operate and use, facilitating improving the use experience.

Description

Foldable baby carriage TECHNICAL FIELD

[0001] The present application relates to the technical field of baby products, in particular to a foldable baby carriage. BACKGROUND

[0002] A baby carriage is a tool vehicle designed to facilitate outdoor activities for infants, which can meet various riding needs of infants such as sitting, standing, lying and sleeping, and reduce the burden of parents, and is loved by consumers. In order to facilitate carrying the baby carriage, the baby carriage is usually designed as a foldable and unfoldable structure, that is, when it is not needed to use, the baby carriage can be folded to reduce the volume, and is convenient to carry and store; when it is needed to use, the baby carriage can be unfolded to be normally used.

[0003] However, the structure of the baby carriage in the prior art is complex, and the folding or unfolding operation is cumbersome and inconvenient, which affects the use experience.

[0004] SUMMARY

[0005] Therefore, it is necessary to provide a foldable baby carriage aiming at the problems of complex structure, cumbersome folding or unfolding operation and poor use experience in the prior art.

[0006] The technical scheme is as follows:

[0007] The present application provides a foldable baby carriage, which comprises:

[0008] a main frame of the carriage;

[0009] a first unfolding joint and a second unfolding joint, the first unfolding joint and the second unfolding joint are respectively connected to left and right sides of the main frame of the carriage, the first unfolding joint and the second unfolding joint each comprise a first unfolding joint piece and a second unfolding joint piece which are rotationally connected, the first unfolding joint piece and the second unfolding joint piece have an unfolding state of mutual unfolding and a folding state of mutual folding;

[0010] a front wheel, two ends of the front wheel are respectively connected to the first unfolding joint pieces one by one;

[0011] a rear wheel, the rear wheel is rotationally connected to the main frame of the carriage;

[0012] a backrest frame, the backrest frame is rotationally connected to the rear wheel and the second unfolding joint piece;

[0013] The first folding joint and the second folding joint each comprise a first folding joint member and a second folding joint member connected in rotation, and the first folding joint member and the second folding joint member have an unfolded state of mutual unfolding and a folded state of mutual folding, and the two first folding joint members are respectively connected in one-to-one correspondence with the two ends of the backrest frame;

[0014] The handle frame is connected in one-to-one correspondence with the two second folding joint members at the two ends of the handle frame; and,

[0015] The operation switch is arranged on the first folding joint, the second folding joint, the backrest frame, the first unfolding joint and the second unfolding joint, and the operation switch has a locked state and an unlocked state, in the locked state, the first unfolding joint member and the second unfolding joint member and the first folding joint member and the second folding joint member are kept in the unfolded state, and the foldable stroller is in a use state, and in the unlocked state, the first unfolding joint member and the second unfolding joint member and the first folding joint member and the second folding joint member are kept in the folded state, and the foldable stroller is in a folded state.

[0016] When the foldable stroller is in a use state, the operation switch is in a locked state, so that the first unfolding joint member and the second unfolding joint member (i.e. the first unfolding joint and the second unfolding joint) and the first folding joint member and the second folding joint member (i.e. the first folding joint and the second folding joint) are kept in the unfolded state, at this time, the backrest frame is erected above the main frame, the handle frame is erected above the backrest frame, and the front wheel and the rear wheel are respectively supported in front of and behind the main frame, so that the infant can sit or lie in the foldable stroller; when the foldable stroller is in a non-use state and needs to be folded, the operation switch is pressed, and the operation switch is switched from the locked state to the unlocked state, at this time, the first unfolding joint member and the second unfolding joint member (i.e. the first unfolding joint and the second unfolding joint) and the first folding joint member and the second folding joint member (i.e. the first folding joint and the second folding joint) are unlocked to obtain a rotational freedom, at this time, the first unfolding joint member, the front wheel and the rear wheel are all turned and folded towards the lower side of the main frame, the backrest frame is turned and folded towards the front of the foldable stroller to the upper side of the main frame, and the handle frame is turned and folded towards the rear of the foldable stroller to the upper side of the backrest frame, so that the foldable stroller can be folded, the folding structure is compact, the space occupied is small, and the operation is convenient and labor-saving; when the foldable stroller needs to be unfolded and used again, the handle frame is pulled upwards, the backrest frame, the front wheel, the first unfolding joint and other components will be automatically rotated and unfolded under the action of gravity, the operation switch is switched to the locked state, and the foldable stroller can be used normally, the operation and use are convenient and labor-saving, and the experience is improved.

[0017] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0018] To better describe and illustrate embodiments and / or examples of the present application, reference can be made to one or more drawings. Additional details or examples used to describe the drawings should not be considered limiting to the scope of the disclosed application, the presently described embodiments and / or examples, and any of the best modes of these applications presently understood.

[0019] Fig. 1 is a structural schematic view of a foldable stroller in an unfolded state according to an embodiment of the present application.

[0020] Fig. 2 is a structural schematic view of the foldable stroller in a folded state.

[0021] Fig. 3 is an exploded structural schematic view of the foldable stroller.

[0022] Fig. 4 is a partial enlarged structural view of A in Fig. 3.

[0023] Fig. 5 is an exploded structural view of a second folding joint.

[0024] Fig. 6 is a partial enlarged structural view of B in Fig. 5.

[0025] Fig. 7 is an exploded structural view of a second unfolding joint.

[0026] BRIEF DESCRIPTION OF DRAWINGS 100: foldable stroller; 10: stroller main frame; 20: first unfolding joint; 30: second unfolding joint; 20a: first unfolding joint member; 30a: second unfolding joint member; 40: front stroller leg; 50: rear stroller leg; 60: backrest frame; 70: first folding joint; 80: second folding joint; 70a: first folding joint member; 71a: first tooth groove; 80a: second folding joint member; 81a: second tooth groove; 90: handlebar frame; 90a: operation switch; 91a: locking gear; 92a: operation button; 93a: folding pulling rope; 94a: clamping tongue; 95a: second elastic reset member; 96a: elastic torsion member; 100a: flexible connecting member. DETAILED DESCRIPTION

[0027] For the purpose of promoting an understanding of the present application, the present application will be described in greater detail below with reference to the drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and should not be considered limited to the embodiments described herein. It should be understood that the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0028] In addition, the terms "first", "second", etc. are used only for descriptive purposes and do not connote or imply relative importance or a quantity or order in which the features are to be implemented. Thus, a feature defined with "first" or "second" can include at least one of the feature explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0030] Referring to FIGS. 1-7, a foldable stroller 100 according to an embodiment of the present application includes a main frame 10, a first unfolding joint 20, a second unfolding joint 30, a front leg 40, a rear leg 50, a backrest frame 60, a first folding joint 70, a second folding joint 80, a handle frame 90, and an operation switch 90a.

[0031] The main frame 10 is a main body structure of the foldable stroller 100, mainly serving the purpose of bearing weight and loading other components. The main frame 10 is a U-shaped member, and the first unfolding joint 20 and the second unfolding joint 30 are respectively connected to the left and right sides of the main frame 10, specifically installed at the two ends of the short side of the U-shaped member. The first unfolding joint 20 and the second unfolding joint 30 each include a first unfolding joint member 20a and a second unfolding joint member 30a rotatably connected to each other, and the first unfolding joint member 20a and the second unfolding joint member 30a have an unfolded state of being unfolded relative to each other and a folded state of being folded relative to each other.

[0032] The front leg 40 is connected to the two first unfolding joint members 20a one by one at both ends thereof, and the rear leg 50 is rotatably connected to the main frame 10. The front leg 40 and the rear leg 50 mainly serve to support the ground when the stroller body is in the unfolded state, thereby supporting the entire stroller body.

[0033] It can be understood that the front leg 40 and the rear leg 50 are each provided with a wheel. Thus, the foldable stroller 100 is facilitated to move. For example, the wheel installed on the front leg 40 is specifically a universal wheel, facilitating the change of the direction of travel. The wheel installed on the rear leg 50 has a brake, facilitating the fixation of the foldable stroller 100.

[0034] The second unfolding joint 30a is provided in an arc shape rising towards the direction away from the main frame 10. On one hand, when the foldable baby carriage 100 is in the unfolded use state, the second unfolding joint 30a rising upwards in an arc shape can serve as a handle, facilitating the baby sitting in the carriage to hold it and ensuring stable sitting posture. On the other hand, when the foldable baby carriage 100 is in the folded state, the user can conveniently hold the two second unfolding joints 30a on both sides to move and carry the whole carriage.

[0035] Further, the backrest frame 60 is rotationally connected with the rear legs 50 and the second unfolding joint 30a. The first folding joint 70 and the second folding joint 80 each include a first folding joint 70a and a second folding joint 80a rotationally connected, the first folding joint 70a and the second folding joint 80a having an unfolded state of mutual unfolding and a folded state of mutual folding, the two first folding joints 70a being respectively and correspondingly connected with the two ends of the backrest frame 60. The two ends of the handle frame 90 are respectively and correspondingly connected with the two second folding joints 80a.

[0036] The operation switch 90a is installed on the first folding joint 70, the second folding joint 80, the backrest frame 60, the first unfolding joint 20 and the second unfolding joint 30. The operation switch 90a has a locked state and an unlocked state. In the locked state, the first unfolding joint 20a and the second unfolding joint 30a and the first folding joint 70a and the second folding joint 80a are kept in the unfolded state, i.e. cannot rotate relatively. At this time, the foldable baby carriage 100 is in the use state and can ensure stable structure. In the unlocked state, i.e. the first unfolding joint 20a and the second unfolding joint 30a and the first folding joint 70a and the second folding joint 80a are kept in the folded state by being in the locked state and can rotate and switch. The foldable baby carriage 100 is in the folded state.

[0037] Please continue to refer to FIG. 1 and FIG. 2, in summary, the implementation of the technical scheme of the embodiment will have the following beneficial effects: when the foldable stroller 100 is in a use state, the operation switch 90a is in a locked state, so that the first unfolding joint 20a and the second unfolding joint 30a (i.e. the first unfolding joint 20 and the second unfolding joint 30) and the first folding joint 70a and the second folding joint 80a (i.e. the first folding joint 70 and the second folding joint 80) are kept in an unfolded state, at this time, the backrest frame 60 is erected above the main frame 10, the handle frame 90 is erected above the backrest frame 60, the front legs 40 and the rear legs 50 are respectively supported in front of and behind the main frame 10, facilitating the infant to sit or lie in the foldable stroller 100; when the foldable stroller 100 is in a non-use state and needs to be folded, press the operation switch 90a, the operation switch 90a is switched from the locked state to the unlocked state, at this time, the first unfolding joint 20a and the second unfolding joint 30a (i.e. the first unfolding joint 20 and the second unfolding joint 30) and the first folding joint 70a and the second folding joint 80a (i.e. the first folding joint 70 and the second folding joint 80) are unlocked to obtain a rotational freedom degree, at this time, the first unfolding joint 20a, the front legs 40 and the rear legs 50 are all folded towards the lower side of the main frame 10, the backrest frame 60 is folded towards the front of the foldable stroller 100 to the upper side of the main frame 10, and the handle frame 90 is folded towards the rear of the foldable stroller 100 to the upper side of the backrest frame 60, so that the foldable stroller 100 can be folded and stored, the folding structure is compact, occupies small space, and is convenient and labor-saving to operate; when the foldable stroller 100 needs to be unfolded and used again, the handle frame 90 is pulled upward, the backrest frame 60, the front legs 40, the first unfolding joint 20 and other components will automatically rotate and unfold under the action of gravity, the operation switch 90a is switched to the locked state, and the foldable stroller 100 can be used normally, which is convenient and labor-saving to operate and helps to improve the experience.

[0038] In the present application, when the foldable stroller 100 is switched from a use state to a folding state, the first unfolding joint 20a, the front legs 40 and the rear legs 50 are all folded towards the lower side of the main frame 10, the backrest frame 60 is folded towards the front of the foldable stroller 100 to the upper side of the main frame 10, and the handle frame 90 is folded towards the rear of the foldable stroller 100 to the upper side of the backrest frame 60.

[0039] In other words, when the foldable stroller 100 is switched into the folded state, the front legs 40, the first unfolding joint 20a and the rear legs 50 are all folded towards the lower side of the main frame 10, and the backrest frame 60 and the handle frame 90 are stacked in a Z-shaped structure to the upper side of the main frame 10, so that all the stroller components can be stacked compactly in the height direction of the main frame 10, thereby greatly reducing the transverse size of the folded stroller body and the storage space occupied.

[0040] It should be noted that the width of the front legs 40 is greater than the width of the rear legs 50, so that after being folded to the lower side of the main frame 10, they can partially overlap, thereby further helping to reduce the stacking thickness.

[0041] Please continue to refer to FIGS. 3 to 6. In an embodiment, the first stowing joint 70a is recessed with a first tooth groove 71a on the side facing the second stowing joint 80a, the second stowing joint 80a is recessed with a second tooth groove 81a on the side facing the first stowing joint 70a, the operation switch 90a includes a locking gear 91a and an operation button 92a, the locking gear 91a is movably arranged in the first tooth groove 71a and the second tooth groove 81a, and the operation button 92a is movably arranged on the side of the second stowing joint 80a away from the first stowing joint 70a.

[0042] In the locked state, part of the locking gear 91a is clamped in the first tooth groove 71a, and the rest of the locking gear 91a is clamped in the second tooth groove 81a, so that the first stowing joint 70a and the second stowing joint 80a cannot rotate; in the unlocked state, the operation button 92a is pressed to push the locking gear 91a out of the second tooth groove 81a and completely into the first tooth groove 71a, so that the first stowing joint 70a and the second stowing joint 80a can rotate relative to each other.

[0043] Specifically, the locking gear 91a can move linearly along its own axis direction. The first tooth groove 71a, the second tooth groove 81a and the locking gear 91a are all designed as a flower tooth structure, which can form multiple circumferential bites to make the first stowing joint 70 and the second stowing joint 80 have stronger locking strength, preventing the handle frame 90 from accidentally rotating when the foldable stroller 100 is in normal use.

[0044] When it is needed to fold the foldable baby carriage 100, the user only needs to press the two operation buttons 92a on both sides at the same time, the operation buttons 92a push the locking gear 91a to move axially and completely enter the first tooth groove 71a, so as to realize the unlocking of the first folding joint 70a and the second folding joint 80a, and the rotating freedom of the handle frame 90 relative to the back frame 60 is obtained, so as to rotate and fold.

[0045] Further, the second folding joint 80a is provided with a clamping hole, the operation button 92a is provided with a clamping hook, the clamping hook is arranged in the clamping hole and can abut against the bottom wall of the second tooth groove 81a to limit. Specifically, when the operation button 92a moves to the limit position towards the outside of the second folding joint 80a, the clamping hook abuts against the bottom wall of the second tooth groove 81a to form a limiting effect, so as to prevent the operation button 92a from falling off the second folding joint 80a.

[0046] When the operation button 92a is pressed, the clamping hook abuts against and pushes the locking gear 91a to move from the second tooth groove 81a to the first tooth groove 71a. Since the clamping hook is designed to have a certain length, only a small stroke of the operation button 92a needs to be pressed, and the locking gear 91a can be pushed into the first tooth groove 71a by the clamping hook, thereby improving the unlocking operation efficiency.

[0047] Further, the operation switch 90a further comprises a first elastic reset member, which abuts between the operation button 92a and the second folding joint 80a. When the operation button 92a is pressed to unlock the first folding joint 70 and the second folding joint 80, the first elastic reset member is in a compressed state; during the process that the handle frame 90 is rotated and unfolded relative to the back frame 60, the second folding joint 80a is also simultaneously rotated and unfolded relative to the first folding joint 70a, and when the two are rotated to a preset position, the first elastic reset member pushes the operation button 92a to automatically reset, thereby facilitating the pressing operation next time.

[0048] Further, the locking gear 91a and the bottom wall of the first tooth groove 71a are also provided with an elastic body, which can push the locking gear 91a to automatically move towards the second tooth groove 81a, so as to realize the automatic resetting of the locking gear 91a and the simultaneous engagement of the first tooth groove 71a and the second tooth groove 81a again, and realize the automatic locking of the first folding joint 70 and the second folding joint 80.

[0049] Please continue to refer to FIGS. 5 and 7, in addition, on the basis of any of the above embodiments, the operation switch 90a further comprises a folding pull rope 93a and a switch assembly, one end of the folding pull rope 93a is connected and fixed with the second folding joint 80a, when the second folding joint 80a is rotated and folded with the handle frame 90, the second folding joint 80a generates a pulling action on the folding pull rope 93a.

[0050] The switch assembly is arranged in the second unfolding joint 30a and can be locked or unlocked with the first unfolding joint 20a. The switch assembly is connected with the other end of the folding rope 93a. When the folding rope 93a pulls the switch assembly, the switch assembly is switched from the locked state to the unlocked state, so that the first unfolding joint 20a and the second unfolding joint 30a can rotate relative to each other.

[0051] It is easy to understand that when the first folding joint 70 and the second folding joint 80 are unlocked by pressing the operation button 92a, the folding handlebar 90 is also pulled by the folding rope 93a while being rotated downward, so that the first unfolding joint 20a and the second unfolding joint 30a can be rotated relative to each other by pulling the switch assembly through the folding rope 93a to switch to the unlocked state, thereby facilitating the synchronous rotation of the front wheel 40 and the first unfolding joint 20a to be folded to the lower side of the main frame 10; the backrest frame 60 and the first folding joint 70a are rotated and folded to the upper side of the main frame 10, so that the rear wheel 50 can also be rotated and folded to the lower side of the main frame 10. That is, only one press of the operation button 92a can simultaneously unlock the first folding joint 70, the second folding joint 80, the first unfolding joint 20 and the second unfolding joint 30, greatly improving the folding efficiency of the foldable stroller 100, saving time and effort, and improving the use experience.

[0052] Specifically, in one embodiment, the switch assembly includes a latch 94a and a second elastic reset member 95a. The first unfolding joint 20a is provided with a lock hole near one end close to the second unfolding joint 30a. The latch 94a is movably arranged in the second unfolding joint 30a and connected with the other end of the folding rope 93a. The second elastic reset member 95a abuts between the latch 94a and the inner wall of the second unfolding joint 30a. In the locked state, part of the latch 94a is clamped into the lock hole. In the unlocked state, the folding rope 93a pulls the latch 94a to drive the latch 94a to exit from the lock hole. The switch assembly adopts the above-mentioned conventional mechanical lock structure, which is simple in structure and working principle and high in working reliability. When the first unfolding joint 20a and the second unfolding joint 30a are rotated again from the folded state to the unfolded state, so that the retracted latch 94a is aligned with the lock hole again, the second elastic reset member 95a in the compressed state automatically pushes the latch 94a to extend and clamp into the lock hole, so as to lock the first unfolding joint 20 and the second unfolding joint 30 again, ensuring that the foldable stroller 100 is stable and has strong carrying capacity in the unfolded use state.

[0053] In yet another embodiment, the switch assembly further comprises a resilient torsion member 96a arranged in the first unfolding joint member 20a and abutting against the second unfolding joint member 30a. When the foldable stroller 100 is switched from the folded state to the unfolded state, the resilient torsion member 96a simultaneously applies torsion to the first unfolding joint member 20a and the second unfolding joint member 30a, so as to make the front leg 40 and the first unfolding joint member 20a rotate and unfold more rapidly in cooperation with the action of gravity, thereby improving the unfolding efficiency of the foldable stroller 100.

[0054] Optionally, the first resilient return member and the second resilient return member 95a are both springs.

[0055] In addition, in yet another embodiment, the foldable stroller 100 further comprises a flexible connecting member 100a, one end of which is connected to the front leg 40 and the other end of which is connected to the backrest frame 60. When the front leg 40 is flipped and unfolded to the limit position from the folded state towards the front of the stroller body, the flexible connecting member 100a is pulled taut by the front leg 40 and the backrest frame 60 at both ends, thereby limiting the front leg 40. At this time, it can be ensured that the catch 94a in the folded state is aligned with the lock hole, so as to facilitate the automatic insertion of the catch 94a into the lock hole.

[0056] Optionally, the flexible connecting member 100a can be any one of an elastic cloth, an elastic rope, etc.

[0057] It is also necessary to point out that, compared to the case where the flexible connecting member 100a is not installed and the foldable stroller needs to be folded, since the backrest frame 60 is connected to the front leg 40 through the flexible connecting member 100a, when the backrest frame 60 is rotated and folded towards the upper side of the main frame 10, it will pull the front leg 40 through the flexible connecting member 100a, so that the front leg 40 can be automatically rotated and folded towards the lower side of the main frame 10 without manual operation by the user, thereby saving the folding operation steps of the foldable stroller 100, improving the folding automation, and improving the user experience.

[0058] It is also necessary to point out that, since the flexible connecting member 100a is made of a material with elasticity, when the foldable stroller 100 in the unfolded state encounters uneven road surfaces or obstacles during travel and the stroller body vibrates, the flexible connecting member 100a can have a certain buffering effect, reducing the vibration transmitted to the infant, improving the shock absorption performance and stability of the foldable stroller 100, protecting the safety of the infant, and improving the riding comfort of the infant.

[0059] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application encompasses all such possible combinations.

[0060] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims, and the description and drawings can be used to explain the content of the claims.

Claims

1. A foldable stroller, comprising: a main frame; first and second unfolding joints, each connected to a left and right side of the main frame, each of the first and second unfolding joints comprising a first and second unfolding joint member rotatably connected, the first and second unfolding joint members having an unfolded state in which they are unfolded from each other and a folded state in which they are folded to each other; front legs, each of the front legs connected to a corresponding one of the first unfolding joint members; rear legs, each of the rear legs rotatably connected to the main frame; a back frame, the back frame rotatably connected to the rear legs and the second unfolding joint members; first and second folding joints, each of the first and second folding joints comprising a first and second folding joint member rotatably connected, the first and second folding joint members having an unfolded state in which they are unfolded from each other and a folded state in which they are folded to each other, each of the first folding joint members connected to a corresponding one of the ends of the back frame; handle frames, each of the handle frames connected to a corresponding one of the second folding joint members; and an operation switch, the operation switch installed on the first and second folding joints, the back frame, the first and second unfolding joints, the operation switch having a locked state in which the first and second unfolding joint members and the first and second folding joint members are kept in the unfolded state and an unlocked state in which the first and second unfolding joint members and the first and second folding joint members are kept in the folded state.

2. The foldable stroller of claim 1, wherein, When the foldable stroller is switched from a use state to a folded state, the first unfolding joint members, the front legs and the rear legs are all folded by being flipped towards a lower side of the main frame, the back frame is folded by being flipped towards a front side of the foldable stroller to an upper side of the main frame, and the handle frames are folded by being flipped towards a rear side of the foldable stroller to an upper side of the back frame.

3. The foldable stroller of claim 1, wherein, The first folding joint member has a first tooth groove recessed on a side thereof facing the second folding joint member, the second folding joint member has a second tooth groove recessed on a side thereof facing the first folding joint member, the operation switch comprises a locking gear and an operation button, the locking gear is movably installed in the first and second tooth grooves, and the operation button is movably installed on a side of the second folding joint member away from the first folding joint member. In the locking state, a part of the locking gear is clamped in the first gear slot, the rest of the locking gear is clamped in the second gear slot, and the first folding joint and the second folding joint are not rotatable; in the unlocking state, the operation button is pressed to push the locking gear out of the second gear slot and fully into the first gear slot, and the first folding joint and the second folding joint are rotatable relative to each other.

4. The foldable stroller of claim 3, wherein, The second folding joint is provided with a clamping hole, the operation button is provided with a clamping hook, the clamping hook is clamped in the clamping hole and can abut against the bottom wall of the second gear slot to limit the movement of the clamping hook; When the operation button is pressed, the clamping hook abuts against and pushes the locking gear to move from the second gear slot to the first gear slot.

5. The foldable stroller of claim 3, wherein, The operation switch further comprises a first elastic reset member, which abuts between the operation button and the second folding joint.

6. The foldable stroller of claim 3, wherein, The operation switch further comprises a folding rope and a switch assembly, one end of the folding rope is fixedly connected with the second folding joint, and when the second folding joint is rotated to fold along with the handle frame, the second folding joint pulls the folding rope; The switch assembly is arranged in the second unfolding joint and can be locked or unlocked with the first unfolding joint, the switch assembly is connected with the other end of the folding rope, and when the folding rope pulls the switch assembly, the switch assembly is switched from the locked state to the unlocked state, so that the first unfolding joint and the second unfolding joint can rotate relative to each other. The switch assembly comprises a clamping tongue and a second elastic reset member, one end of the first unfolding joint close to the second unfolding joint is provided with a lock hole, the clamping tongue is movably arranged in the second unfolding joint and connected with the other end of the folding rope, and the second elastic reset member abuts between the clamping tongue and the inner wall of the second unfolding joint; in the locked state, part of the clamping tongue is clamped in the lock hole; in the unlocked state, the folding rope pulls the clamping tongue to drive the clamping tongue to exit from the lock hole.

7. The foldable stroller of claim 6, wherein, The switch assembly further comprises an elastic torsion member, which is arranged in the first unfolding joint and abuts against the second unfolding joint.

8. The foldable stroller of claim 7, wherein, The front wheel and the rear wheel are both provided with a wheel; the second unfolding joint is provided in an arc structure rising away from the main frame.

9. The foldable stroller of claim 1, wherein, The foldable stroller further comprises a flexible connecting member, one end of the flexible connecting member is connected with the front wheel, and the other end of the flexible connecting member is connected with the backrest frame.

10. The foldable stroller of claim 1, wherein, ​

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