Joint folding mechanism and stroller

Abstract

The utility model discloses a joint folding mechanism and a baby stroller, which are characterized in that a front foot connecting piece, a rear foot connecting piece, a push rod connecting piece and a linkage piece are correspondingly pivoted to form a four-bar mechanism; the joint locking mechanism locks the joint folding mechanism so that a four-bar mechanism formed by pivoting the front foot connecting piece, the rear foot connecting piece, the push rod connecting piece and the linkage piece can be converted into a stable triangular connecting structure, and therefore the joint folding mechanism and the stroller with the joint folding mechanism have the advantages of being stable and reliable in structure and simple in overall appearance structure. And meanwhile, the operation is convenient.

Description

[Technical field]

[0001] The utility model relates to the technical field of baby carriages, in particular to a joint folding mechanism and a baby carriage. [Background technology]

[0002] When a baby stroller is unfolded, the front and rear legs and the push rod are usually locked to each other, thereby forming a frame capable of carrying and supporting a child passenger. To achieve the purpose of locking the front and rear legs and the push rod, one or more locking mechanisms need to be provided. Common structural designs include the structure disclosed in Chinese Patent No. 201320822748.0, which locks the front bracket assembly and the push rod assembly at the same time by providing a controllable unlocking lock pin on the rear bracket assembly. Since the locking structure of this structure is a single-point snap-in lock, the shearing force on the locking member is large when it is unfolded and used, and it is easy to fatigue and fail, affecting safe use and its life.

[0003] In order to achieve multi-point contact locking of the joints between the front foot rod, the rear foot rod and the push rod, a structure using tooth blocks for meshing and locking is also commonly used in the prior art. The joints using such a structure have a larger appearance and the matching accuracy between the parts is also high, which affects the manufacturing and assembly costs, and also makes the structure of the frame joint part not simple enough.

[0004] For this reason, the present invention is studied and proposed in view of the above-mentioned problems. [Contents of the utility model]

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a joint folding mechanism, which forms a four-bar mechanism by correspondingly pivoting a front foot connecting member, a rear foot connecting member, a push rod connecting member and a linkage member, and is locked and converted into a stable triangular connection structure when in an unfolded state, and has the characteristics of stable and reliable structure and simple overall appearance structure; in addition, only one set of joint locking mechanism and joint unlocking mechanism is needed to lock and release the joint folding mechanism, and it has the characteristics of convenient operation and simple structure, and has better mechanical connection strength.

[0006] The utility model also provides a child stroller. Since the child stroller adopts the joint folding mechanism, the child stroller of the utility model has the characteristics of convenient operation, stable structure, reliability and simplicity.

[0007] The utility model provides a joint folding mechanism, which can be switched between an unfolded state and a folded state, and includes: a rear foot connecting member 2, which is used to be relatively fixedly connected to the upper end of the rear foot rod 120 of the child stroller; a front foot connecting member 1, which is used to be relatively fixedly connected to the upper end of the front foot rod 110 of the child stroller and is rotatably connected to the rear foot connecting member 2 through a pivot axis A; a push rod connecting member 3, which is used to be relatively fixedly connected to the lower end of the hand push rod 130 of the child stroller and is rotatably connected to the rear foot connecting member 2 through a pivot axis B, and the pivot axis B is connected to the pivot axis A is not on the same axis; a linkage member 4, the front part of the linkage member 4 is pivoted to the front foot connecting member 1 through a pivot axis C deviating from the pivot axis A, and the rear part of the linkage member 4 is pivoted to the push rod connecting member 3 through a pivot axis D deviating from the pivot axis B, so that the front foot connecting member 1, the rear foot connecting member 2, the push rod connecting member 3 and the linkage member 4 are pivoted accordingly to form a four-bar mechanism; a joint locking mechanism 5, the joint locking mechanism 5 is configured to lock the joint folding mechanism in the unfolded state; a joint unlocking mechanism 6, the joint unlocking mechanism 6 is configured to link the unlocking action of the joint locking mechanism 5 to release the locked state of the joint folding mechanism.

[0008] In the joint folding mechanism as described above, the joint locking mechanism 5 is located between the rear foot connecting member 2 and the push rod connecting member 3, and when the joint folding mechanism is in the unfolded state, the joint locking mechanism 5 locks the push rod connecting member 3 relative to the rear foot connecting member 2, so that the four-bar mechanism formed by the front foot connecting member 1, the rear foot connecting member 2, the push rod connecting member 3 and the linkage member 4 is converted into a stable triangular connection structure.

[0009] As described above, a joint folding mechanism, the joint locking mechanism 5 includes a push rod locking notch 51 arranged on the rear foot connecting member 2 and a push rod locking link 52 which can be slidably arranged relative to the push rod connecting member 3, and the push rod locking link 52 is provided with a push rod locking block 521 which can be inserted into the push rod locking notch 51 to lock the push rod connecting member 3 relative to the rear foot connecting member 2; the joint locking mechanism 5 also includes a locking link reset member 53 for driving the push rod locking link 52 to elastically reset; the push rod locking link 52 is configured to be unlocked by the joint unlocking mechanism 6.

[0010] As described above, in a joint folding mechanism, the joint unlocking mechanism 6 includes a push rod unlocking block 61 which is provided on the hand push rod 130 and can move relative to the push rod connecting member 3, and the push rod unlocking block 61 is connected to the push rod locking link 52 via a push rod unlocking link 62.

[0011] As described above, a joint folding mechanism also includes a safety locking mechanism 7 for locking the push rod unlocking block 61, wherein the safety locking mechanism 7 includes a safety blocking block for connecting to the hand push rod 130 and for blocking and cooperating with the push rod unlocking block 61 to prevent the push rod unlocking block 61 from sliding accordingly.

[0012] In the joint folding mechanism as described above, a connecting rod guide structure 8 is provided between the push rod locking link 52 and the push rod connecting member 3, and the connecting rod guide structure 8 includes a connecting rod guide groove 81 provided on the push rod connecting member 3 and a connecting rod guide protrusion 82 provided on the push rod locking link 52 and slidably placed in the connecting rod guide groove 81.

[0013] In a joint folding mechanism as described above, a rotation guide structure 9 is provided between the front foot connecting member 1 and the rear foot connecting member 2 for guiding the rotation path of the front foot connecting member 1 and limiting the extension and retraction. The rotation guide structure 9 includes a rotation guide arc groove 91 provided on the front foot connecting member 1 or the rear foot connecting member 2 and a rotation guide rod 92 correspondingly provided on the rear foot connecting member 2 or the front foot connecting member 1 and movable along the rotation guide arc groove 91. When the rotation guide rod 92 moves to the end of the rotation guide arc groove 91, the front foot connecting member 1 is restricted from continuing to rotate relative to the rear foot connecting member 2 and is correspondingly in an expanded state or a folded state.

[0014] As described above, a joint folding mechanism also includes a bite structure 10 for making the push rod connector 3 and the front foot connector 1 interfere with each other when the push rod connector 3 is in an unfolded state relative to the rear foot connector 2. The bite structure 10 includes a bite protrusion 101 and a bite recess 102 which are correspondingly arranged on the push rod connector 3 and the front foot connector 1 and can interfere with each other.

[0015] The utility model also provides a child stroller, which can be switched between an unfolded state and a folded state, and includes a frame 100 and a seat frame connected to the frame 100, the frame 100 includes a front foot rod 110, a rear foot rod 120 and a push rod 130, and a joint folding mechanism as described above is provided between the front foot rod 110, the rear foot rod 120 and the push rod 130.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. The utility model forms a four-bar mechanism by correspondingly pivoting the front foot connecting member, the rear foot connecting member, the push rod connecting member and the linkage member, and when the joint folding mechanism is in the unfolded state, the joint locking mechanism locks the joint folding mechanism so that the four-bar mechanism pivotally formed by the front foot connecting member, the rear foot connecting member, the push rod connecting member and the linkage member is converted into a stable triangular connection structure, and the joint folding mechanism can be locked and unlocked by a group of joint locking mechanisms and joint unlocking mechanisms. Therefore, the adoption of this scheme has the characteristics of convenient operation and simple structure, stable and reliable structure, more optimized mechanical connection strength and force, and simpler overall appearance structure.

[0018] 2. The utility model guides the movement path of the push rod locking link through the connecting rod guide structure, which helps to ensure that the push rod locking block is smoothly and accurately inserted into the push rod locking notch when it is deployed and used, ensuring smooth locking.

[0019] 3. The utility model guides and limits the rotation path of the front foot connecting piece through the rotation guide structure, so that the front foot connecting piece can stably and smoothly rotate along the set direction, thereby improving the folding and unfolding effect; at the same time, when the rotation guide rod moves to the end of the rotation guide arc groove, the front foot connecting piece is restricted from continuing to rotate relative to the rear foot connecting piece, so that the front foot connecting piece is stably in the unfolded state or the folded state.

[0020] 4. The utility model can make the push rod connector and the front foot connector in the unfolded state bite and contact with each other through the bite structure, ensuring the stability of the joint folding mechanism structure in the unfolded state, avoiding shaking due to the presence of a void, and improving the user experience.

Brief Description of the Drawings

[0021] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is one of the three-dimensional views of the child stroller in the utility model when it is in the unfolded state.

[0023] Figure 2 This is the second stereoscopic view of the child stroller in the utility model when it is in the unfolded state.

[0024] Figure 3 This is the third stereoscopic view of the child stroller in the utility model when it is in the unfolded state.

[0025] Figure 4 It is a three-dimensional schematic diagram of the child stroller in the utility model during the folding process.

[0026] Figure 5 This is one of the three-dimensional views of the joint folding mechanism of the utility model when it is in the unfolded state.

[0027] Figure 6 This is the second stereoscopic view of the joint folding mechanism of the present invention in the unfolded state.

[0028] Figure 7 It is a three-dimensional schematic diagram of the joint folding mechanism of the utility model during the folding process.

[0029] Figure 8 It is an exploded view of the joint folding mechanism of the utility model.

[0030] Fig. 9 It is an exploded view of the push rod unlocking mechanism in the utility model.

[0031] Fig.10 It is a structural schematic diagram of the safety locking mechanism and the push rod unlocking mechanism in the utility model. [Specific implementation method]

[0032] The implementation modes of the present utility model are described in detail below in conjunction with the accompanying drawings.

[0033] like Figure 1-10 As shown, the utility model provides a joint folding mechanism, which can be switched between an unfolded state and a folded state, and includes: a rear foot connecting member 2, a front foot connecting member 1, a push rod connecting member 3, a linkage member 4, a joint locking mechanism 5 and a joint unlocking mechanism 6. The rear foot connecting member 2 is used to be relatively fixedly connected to the upper end of the rear foot rod 120 of the child stroller; the front foot connecting member 1 is used to be relatively fixedly connected to the upper end of the front foot rod 110 of the child stroller and is rotatably connected to the rear foot connecting member 2 through a pivot axis A; the push rod connecting member 3 is used to be relatively fixedly connected to the lower end of the hand push rod 130 of the child stroller and is rotatably connected to the rear foot connecting member 2 through a pivot axis B, and the pivot axis B and the pivot axis A are not on the same axis; the front part of the linkage member 4 is pivotally connected to the front foot connecting member 1 through a pivot axis C deviating from the pivot axis A, and the rear part of the linkage member 4 is pivotally connected to the push rod connecting member 3 through a pivot axis D deviating from the pivot axis B, so that the front foot connecting member 1, the rear foot connecting member 2, the push rod connecting member 3 and the linkage member 4 are correspondingly pivoted to form a four-bar mechanism; the joint locking mechanism 5 is configured to lock the joint folding mechanism in the unfolded state; the joint unlocking mechanism 6 is configured to link the unlocking action of the joint locking mechanism 5 to release the locked state of the joint folding mechanism.

[0034] When the utility model is folded, the user only needs to operate the joint unlocking mechanism 6 to link the unlocking action of the joint locking mechanism 5 to release the locked state of the joint folding mechanism; then the push rod connecting piece is rotated and folded relative to the rear foot connecting piece so that the push rod connecting piece is moved closer to the side of the rear foot connecting piece, and at the same time, during the rotation and folding process of the above-mentioned push rod connecting piece, the push rod connecting piece is linked to the front foot connecting piece to rotate and fold relative to the rear foot connecting piece through the linkage piece so that the front foot connecting piece is moved closer to the side of the rear foot connecting piece until the folding operation of the joint folding mechanism is completed.

[0035] In addition, the utility model forms a four-bar mechanism by correspondingly pivoting the front foot connecting piece, the rear foot connecting piece, the push rod connecting piece and the linkage piece. Only one set of joint locking mechanism and joint unlocking mechanism is needed to lock and release the joint folding mechanism. When the utility model is in the unfolded state, the joint locking mechanism locks the joint folding mechanism so that the four-bar mechanism pivotally formed by the front foot connecting piece, the rear foot connecting piece, the push rod connecting piece and the linkage piece is converted into a stable triangular connection structure. Therefore, in the unfolded state, its locking is stable and reliable, and it has better mechanical connection strength and can withstand greater external force. Furthermore, the joint adopting this scheme has a simpler overall appearance structure.

[0036] like Figure 6 As shown, the pivot axis C and the pivot axis D in the unfolded state are located between the pivot axis A and the pivot axis B, and the pivot axis C is located below the pivot axis D. Figure 7 As shown, the push rod connecting member can drive the front foot connecting member to move toward the rear foot connecting member through the linkage member and fold.

[0037] In order to facilitate the folding and unfolding of the utility model and to make the structure in the unfolded state more reliable, the joint locking mechanism 5 is located between the rear foot connecting member 2 and the push rod connecting member 3, and when the joint folding mechanism is in the unfolded state, the joint locking mechanism 5 locks the push rod connecting member 3 relative to the rear foot connecting member 2, so that the four-bar mechanism formed by the front foot connecting member 1, the rear foot connecting member 2, the push rod connecting member 3 and the linkage member 4 is converted into a stable triangular connection structure. Specifically, the joint locking mechanism 5 includes a push rod locking notch 51 provided on the rear foot connecting member 2 and a push rod locking link 52 which can be slidably arranged relative to the push rod connecting member 3, the push rod locking notch 51 is a U-shaped notch, and the push rod locking link 52 is provided with a push rod locking block 521 which can be inserted into the push rod locking notch 51 to lock the push rod connecting member 3 relative to the rear foot connecting member 2; the joint locking mechanism 5 also includes a locking link reset member 53 for driving the push rod locking link 52 to elastically reset; the push rod locking link 52 is configured to be unlocked in conjunction with the joint unlocking mechanism 6, and in order to achieve the effect of automatic reset, the locking link reset member 53 can be an elastic member such as a compression spring or a tension spring.

[0038] like Fig. 9, 10 As shown, in order to facilitate the unlocking and efficient, the joint unlocking mechanism 6 includes a push rod unlocking block 61 which is arranged on the hand push rod 130 and can move relative to the push rod connecting member 3, and the push rod unlocking block 61 is connected to the push rod locking link 52 through the push rod unlocking link 62. In this embodiment, the push rod unlocking block 61 and the push rod unlocking link 62 are both rigid components. The push rod unlocking block 61 can timely drive the push rod locking link 52 to unlock in a corresponding manner through the push rod unlocking link 62, thereby improving the unlocking response speed. In order to facilitate the use with the safety blocking block, the push rod unlocking block 61 is configured to slide horizontally relative to the hand push rod 130 and the push rod unlocking link 62, and is also configured to slide up and down relative to the hand push rod 130 in conjunction with the push rod unlocking link 62. The joint unlocking mechanism 6 also includes a lateral reset elastic member 63 for driving the push rod unlocking block 61 to slide horizontally and reset.

[0039] like Figure 2 , 10 As shown, in order to avoid the situation of unlocking by mistake and to improve the safety of use, the joint unlocking mechanism 6 also includes a safety locking mechanism 7 for locking the push rod unlocking block 61, and the safety locking mechanism 7 includes a safety blocking block for connecting to the hand push rod 130 and for blocking and cooperating with the push rod unlocking block 61 to prevent the push rod unlocking block 61 from sliding accordingly.

[0040] like Figure 7 , 8 As shown, a connecting rod guide structure 8 is provided between the push rod locking link 52 and the push rod connecting member 3. The connecting rod guide structure 8 includes a connecting rod guide groove 81 provided on the push rod connecting member 3 and a connecting rod guide protrusion 82 provided on the push rod locking link 52 and slidably placed in the connecting rod guide groove 81. When unfolded into place, it is helpful to ensure that the push rod locking block is smoothly and accurately inserted into the push rod locking notch, thereby ensuring reliable locking action.

[0041] like Figure 6-8As shown, a rotation guide structure 9 for guiding the rotation path of the front foot connection member 1 and limiting the extension and retraction of the front foot connection member 1 is provided between the front foot connection member 1 and the rear foot connection member 2. The rotation guide structure 9 includes a rotation guide arc groove 91 provided on the front foot connection member 1 or the rear foot connection member 2 and a rotation guide rod 92 correspondingly provided on the rear foot connection member 2 or the front foot connection member 1 and movable along the rotation guide arc groove 91. When the rotation guide rod 92 moves to the end of the rotation guide arc groove 91, the front foot connection member 1 is restricted from continuing to rotate relative to the rear foot connection member 2 and is correspondingly in an expanded state or a folded state. This embodiment uses a rotating guide structure to guide and limit the rotation path of the front foot connecting piece, so that the front foot connecting piece can rotate stably and smoothly along the set direction, thereby improving the folding and unfolding effect; at the same time, when the rotating guide rod moves to the end of the rotating guide arc groove, the front foot connecting piece is restricted from continuing to rotate relative to the rear foot connecting piece, so that the front foot connecting piece is stably in the unfolded state or the folded state, and can also play an auxiliary role in the card-jointing cooperation between the push rod locking block and the push rod locking notch, ensuring that the locking end of the push rod locking block is aligned with the mouth of the push rod locking notch.

[0042] like Figure 6-8 As shown, in order to ensure the stability of the joint folding mechanism structure in the unfolded state and avoid the occurrence of virtual position and shaking, the utility model also includes a bite structure 10. When the push rod connector 3 is in the unfolded state relative to the rear foot connector 2, the bite structure 10 is used to make the push rod connector 3 and the front foot connector 1 mutually contact and bite. Specifically, the bite structure 10 includes a bite protrusion 101 and a bite recess 102 respectively arranged on the push rod connector 3 and the front foot connector 1 and can mutually contact and bite. In the unfolded state, the push rod connector 3 and the front foot connector 1 are mutually engaged through the bite protrusion 101 and the bite recess 102, so as to avoid shaking due to a large gap between the opposite ends of the push rod connector 3 and the front foot connector 1, thereby affecting the comfort and life of the joint. Moreover, the bite structure 10 is mutually connected in the unfolded state, which can also play an auxiliary role in the clamping cooperation between the push rod locking block and the push rod locking notch, ensuring that the locking end of the push rod locking block is aligned with the mouth of the push rod locking notch.

[0043] like Figure 1-10As shown, the utility model provides a child stroller, which can be switched between an unfolded state and a folded state, and includes a frame 100 and a seat frame connected to the frame 100, the frame 100 includes a front foot rod 110, a rear foot rod 120 and a push rod 130, and a joint folding mechanism as described above is arranged between the front foot rod 110, the rear foot rod 120 and the push rod 130. When the frame 100 is unfolded, the rear foot connecting member 2, the front foot connecting member 1, the push rod connecting member 3, the linkage member 4, and the joint locking mechanism 5 are correspondingly hidden on the inner sides of the front foot rod 110, the rear foot rod 120 and the push rod 130, so that the connection parts of the front foot rod 110, the rear foot rod 120 and the push rod 130 have a neat and simple transition, and the frame has the characteristics of stable and reliable locking when unfolded.

[0044] About the folding principle of a child stroller of the utility model:

[0045] First, the user causes the push rod unlocking block 61 to slide laterally relative to the hand push rod 130 so that the blocking end of the push rod unlocking block 61 is misaligned with the safety lock block, such as Fig.10 As shown;

[0046] Next, the push rod unlocking block 61 is operated to slide upward relative to the hand push rod 130, and the push rod unlocking block 61 drives the push rod locking link 52 to slide upward relative to the push rod connecting member 3 of the hand push rod 130 through the push rod unlocking link 62, so that the locking end of the push rod locking block exits the push rod locking notch, thereby releasing the locking state of the push rod connecting member 3 relative to the rear foot connecting member 1. Figure 7 As shown, the locking state of the push rod 130 relative to the rear foot rod 120 is released;

[0047] Afterwards, the push rod connecting member 3 is flipped downward relative to the rear foot connecting member 1 so that the hand push rod 130 and the rear foot rod 120 are brought together and folded. At the same time, during the rotation and folding process of the above-mentioned push rod connecting member, the push rod connecting member links the front foot connecting member with the rear foot connecting member through the linkage member to rotate and fold accordingly, so that the front foot rod 110 is brought together and folded toward the side of the rear foot rod 120.

Claims

1. A joint folding mechanism, which can be switched between an unfolded state and a folded state, characterized in that include: A rear foot connecting piece (2), the rear foot connecting piece (2) being used for being relatively fixedly connected to the upper end of the rear foot rod (120) of the child stroller; A front foot connecting member (1), the front foot connecting member (1) being used to be relatively fixedly connected to the upper end of the front foot rod (110) of the child stroller and rotatably connected to the rear foot connecting member (2) via a pivot axis A; A push rod connecting member (3), the push rod connecting member (3) being fixedly connected to the lower end of the push rod (130) of the child stroller and rotatably connected to the rear leg connecting member (2) via a pivot axis B, wherein the pivot axis B and the pivot axis A are not on the same axis; A linkage member (4), wherein the front portion of the linkage member (4) is pivotally connected to the front foot connection member (1) via a pivot axis C that deviates from the pivot axis A, and the rear portion of the linkage member (4) is pivotally connected to the push rod connection member (3) via a pivot axis D that deviates from the pivot axis B, so that the front foot connection member (1), the rear foot connection member (2), the push rod connection member (3) and the linkage member (4) are pivotally connected to form a four-bar mechanism; A joint locking mechanism (5), the joint locking mechanism (5) being configured to lock the joint folding mechanism in an unfolded state; A joint unlocking mechanism (6) is configured to be used to link the unlocking action of the joint locking mechanism (5) to release the locked state of the joint folding mechanism.

2. A joint folding mechanism according to claim 1, characterized in that The joint locking mechanism (5) is located between the rear foot connecting member (2) and the push rod connecting member (3), and when the joint folding mechanism is in an unfolded state, the joint locking mechanism (5) locks the push rod connecting member (3) relative to the rear foot connecting member (2), so that the four-bar mechanism formed by the front foot connecting member (1), the rear foot connecting member (2), the push rod connecting member (3) and the linkage member (4) is transformed into a stable triangular connection structure.

3. A joint folding mechanism according to claim 2, characterized in that The joint locking mechanism (5) comprises a push rod locking notch (51) provided on the rear foot connecting member (2) and a push rod locking link (52) slidably arranged relative to the push rod connecting member (3); the push rod locking link (52) is provided with a push rod locking block (521) that can be inserted into the push rod locking notch (51) to lock the push rod connecting member (3) relative to the rear foot connecting member (2); the joint locking mechanism (5) also comprises a locking link reset member (53) for driving the push rod locking link (52) to elastically reset; the push rod locking link (52) is configured to be unlocked by the joint unlocking mechanism (6).

4. A joint folding mechanism according to claim 3, characterized in that The joint unlocking mechanism (6) comprises a push rod unlocking block (61) which is arranged on the hand push rod (130) and can move relative to the push rod connecting member (3); the push rod unlocking block (61) is connected to the push rod locking link (52) via a push rod unlocking link (62).

5. A joint folding mechanism according to claim 4, characterized in that It also includes a safety locking mechanism (7) for locking the push rod unlocking block (61), wherein the safety locking mechanism (7) includes a safety blocking block for connecting to the hand push rod (130) and for blocking and cooperating with the push rod unlocking block (61) to prevent the push rod unlocking block (61) from sliding accordingly.

6. A joint folding mechanism according to claim 3, characterized in that A connecting rod guide structure (8) is provided between the push rod locking connecting rod (52) and the push rod connecting member (3), and the connecting rod guide structure (8) comprises a connecting rod guide groove (81) provided on the push rod connecting member (3) and a connecting rod guide protrusion (82) provided on the push rod locking connecting rod (52) and slidably disposed in the connecting rod guide groove (81).

7. A joint folding mechanism according to any one of claims 1 to 6, characterized in that A rotation guide structure (9) for guiding the rotation path of the front foot connecting member (1) and limiting the extension and retraction is provided between the front foot connecting member (1) and the rear foot connecting member (2).

8. A joint folding mechanism according to claim 7, characterized in that The rotation guide structure (9) comprises a rotation guide arc groove (91) provided on the front foot connecting member (1) or the rear foot connecting member (2) and a rotation guide rod (92) provided on the rear foot connecting member (2) or the front foot connecting member (1) and movable along the rotation guide arc groove (91); when the rotation guide rod (92) moves to the end of the rotation guide arc groove (91), the front foot connecting member (1) is restricted from continuing to rotate relative to the rear foot connecting member (2) and is in an unfolded state or a folded state respectively.

9. A joint folding mechanism according to any one of claims 1 to 6, characterized in that It also includes a bite structure (10) for causing the push rod connecting member (3) and the front foot connecting member (1) to engage with each other when the push rod connecting member (3) is in an expanded state relative to the rear foot connecting member (2). The bite structure (10) includes a bite protrusion (101) and a bite recess (102) which are respectively arranged on the push rod connecting member (3) and the front foot connecting member (1) and can engage with each other.

10. A child stroller, which can be switched between an unfolded state and a folded state, characterized in that The invention comprises a frame (100) and a seat frame connected to the frame (100); the frame (100) comprises a front foot rod (110), a rear foot rod (120) and a push rod (130); a joint folding mechanism as claimed in any one of claims 1 to 9 is arranged between the front foot rod (110), the rear foot rod (120) and the push rod (130).

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