Stroller frame and stroller

Abstract

The application discloses a stroller frame and a child stroller, and relates to the technical field of stroller frames, in particular to a stroller frame and a child stroller. The stroller frame comprises a front support, a rear support, a push rod assembly and a linkage mechanism; two of the front support, the rear support and the push rod assembly are rotationally connected, and the other one is rotationally connected with at least one of the two; the linkage mechanism is connected to the front support, the rear support and the push rod assembly, and the engagement position of the linkage mechanism and the push rod assembly is located on one end of the push rod assembly close to the front support; when the push rod assembly is folded towards the rear support, the push rod assembly drives the front support to move towards the rear support in the direction of first moving away from the rear support and then moving towards the rear support through the linkage mechanism, so that the front support and the push rod assembly are synchronously folded towards the rear support. The technical scheme of the application can improve the folding synchronization of the front support and the push rod assembly of the stroller frame, improve the compactness and stability of the folding of the stroller frame, and improve the use experience of the child stroller for users.

Description

Technical Field

[0001] This invention relates to the field of children's products technology, and in particular to a stroller frame and a stroller using the stroller frame. Background Technology

[0002] In related technologies, to improve the convenience of carrying strollers, more and more strollers are designed with foldable frames. However, when folding and storing these stroller frames, the front support and push rod assembly fold separately, which can easily lead to uneven stress on the stroller frame. This can affect the compactness of the folding and cause abnormal noises, thus impacting the user's stroller experience. Summary of the Invention

[0003] The main objective of this invention is to provide a stroller frame that improves the synchronicity of the folding and closing of the front support and push rod assembly of the stroller frame, thereby improving the compactness and stability of the stroller frame folding and enhancing the user's stroller experience.

[0004] To achieve the above objectives, the trolley frame proposed in this invention includes a front support, a rear support, a push rod assembly, and a linkage mechanism;

[0005] Two of the front bracket, the rear bracket, and the push rod assembly are rotatably connected, and the third component is rotatably connected to at least one of the two components.

[0006] The linkage mechanism is connected to the front bracket, the rear bracket, and the push rod assembly. The engagement position of the linkage mechanism and the push rod assembly is located at one end of the push rod assembly closer to the front bracket.

[0007] When the push rod assembly moves toward the rear support and folds, the push rod assembly drives the front support to move away from the rear support and then toward the rear support through the linkage mechanism, so that the front support and the push rod assembly move toward the rear support synchronously.

[0008] Optionally, the linkage mechanism includes a first connector and a second connector, the first connector being rotatably connected to the front support, and the second connector being rotatably connected to the first connector and the rear support; in the unfolded state, the line connecting the rotation axis of the first connector and the front support and the rotation axis of the second connector and the rear support is defined as the first axis line;

[0009] The rotation axis of the first connector and the second connector is located below the line connecting the first axis; when the push rod assembly is driven, the engagement position of the first connector and the second connector moves upward and drives the first connector and the second connector to move upward and fold together;

[0010] or,

[0011] The rotation axis of the first connector and the second connector is located above the line connecting the first axis; when the push rod assembly is driven, the engagement position of the first connector and the second connector moves downward and drives the first connector and the second connector to fold downward.

[0012] Optionally, in the unfolded state, the engagement position of the first connector and the second connector is located close to the rear bracket;

[0013] And / or, the engagement position of the second connector and the rear bracket is located relative to one end of the rear bracket near the front bracket;

[0014] And / or, the engagement position of the first connector and the front bracket is located at the middle position on the front bracket;

[0015] And / or, when the rotation axis of the first connector and the second connector is located below the line connecting the first axis, the first connector has an arc-shaped structure, and in the unfolded state, the concave arc surface of the first connector faces downward; the end of the second connector near the first connector has an arc-shaped structure, and in the unfolded state, the concave arc surface of the second connector faces upward, the concave arc surface of the first connector and the concave arc surface of the second connector are tangent, and the convex arc surface of the first connector and the convex arc surface of the second connector are tangent.

[0016] Optionally, in the unfolded state, the end of the second connector away from the first connector extends between the rear bracket and the push rod assembly;

[0017] The linkage mechanism further includes a third connector, one end of which is rotatably connected to the end of the second connector away from the first connector, and the other end of which is rotatably connected to the push rod assembly. The engagement position of the third connector and the push rod assembly is located relative to the push rod assembly near the front bracket.

[0018] Optionally, the distance between the rotation axis of the first connector and the second connector and the rotation axis of the second connector and the rear bracket is defined as L5, and the distance between the rotation axis of the second connector and the rear bracket and the rotation axis of the second connector and the third connector is defined as L6, where L6 is greater than L5; wherein, L5 and L6 satisfy the following condition: 0.6≤L5 / L6≤0.8;

[0019] And / or, in the unfolded state, the trolley frame is defined to have a vertical direction, with the opening of the angle formed by the front support and the rear support facing downwards, and the rotation axis of the second connector and the third connector positioned higher than the rotation axis of the second connector and the rear support; the opening of the angle formed by the second connector and the third connector is opposite to the opening of the angle formed by the push rod assembly and the rear support; in the unfolded state, the opening of the angle formed by the third connector and the second connector faces forward; when the push rod assembly moves towards the rear support and folds, the engagement position of the third connector and the second connector moves backwards; the engagement position of the first connector and the second connector moves upwards.

[0020] Optionally, the trolley frame further includes a seat frame rotatably connected to at least one of the front support, the rear support, and the push rod assembly;

[0021] The linkage mechanism also includes a fourth connector, which is rotatably connected to the seat frame and rotatably connected to the second connector. In the folded state, the second connector can drive the seat frame to fold and move closer to the front support through the fourth connector.

[0022] Optionally, one end of the fourth connector is rotatably connected to the second connector at a position close to the first connector; when folded, the engagement position of the fourth connector and the second connector flips with the second connector and moves upward as a whole;

[0023] The other end of the fourth connector is rotatably connected to the rear end of the seat frame. In the folded state, the fourth connector pushes the rear end of the seat frame to flip upward so that the front end of the seat frame flips downward and moves closer to the front support.

[0024] Optionally, one end of the fourth connector is rotatably connected to the second connector;

[0025] The other end of the fourth connector is rotatably connected to the seat frame. In the folded state, the fourth connector pulls the front end of the seat frame downward and flips it close to the front support.

[0026] Optionally, the second connector has a body and a connecting segment extending outward from the body, wherein when folded, the connecting segment rotates rearward with the second connector as a whole; the connecting segment engages with the fourth connector, and the engagement position is located above the engagement position of the first connector and the second connector; the engagement position of the fourth connector and the seat frame is located in front of the engagement position of the seat frame with at least one of the front support, the rear support and the push rod assembly.

[0027] Optionally, the trolley frame further includes a backrest, which is rotatably connected to the seat frame and / or the fourth connector. The end of the fourth connector away from the rotatably connected second connector is rotatably connected to the end of the seat frame near the backrest, so that when the first and second connectors are folded and close together, the end of the seat frame near the backrest can be rotated upwards via the fourth connector, and the end of the backrest away from the seat frame can be rotated downwards under its own weight. The backrest is rotatably connected to the fourth connector, and the rotation axes of the seat frame and the fourth connector are spaced apart from the rotation axes of the fourth connector and the backrest.

[0028] Optionally, the push rod assembly includes a lower push rod and an upper push rod, one end of the lower push rod being rotatably connected to the front bracket and / or the rear bracket, and the other end being rotatably connected to the upper push rod;

[0029] The linkage mechanism is connected to the lower push rod. When the push rod assembly is folded, it can drive the front bracket to move under the action of gravity through the linkage mechanism.

[0030] Optionally, the rear support is connected to a rotatable rear moving wheel at the end away from the front support and / or the lower push rod; a rotating joint is formed at the rotatable connection between the lower push rod and the upper push rod, and the rotating joint forms an abutment plane; in the folded state, the trolley frame is supported on the support surface by the rear moving wheel and the abutment plane;

[0031] And / or, define the included angle formed by the front support and the rear support as α, and the included angle formed by the push rod assembly and the rear support as p, satisfying the relationship: 0.7≤α / p≤1.1.

[0032] The present invention also proposes a children's stroller, including the stroller frame as described above.

[0033] In the stroller frame of this invention, during folding, as the push rod assembly folds and approaches the rear support, the push rod assembly can, through a linkage mechanism, drive the front support to move away from the rear support first, and then fold and approach the rear support. This extends the time required for the front support to complete folding and approaching the rear support, thereby reducing the possibility that the angle between the front and rear supports, being smaller than the angle between the rear support and the push rod assembly, might cause the front support to fold and approach the rear support before the push rod assembly. In other words, due to the linkage mechanism, the stroller frame in this solution improves the synchronization of the folding and approaching of the front support and push rod assembly on the rear support, allowing the rear support to be evenly stressed during folding. This facilitates a more compact and quieter folding of the stroller frame, thereby improving the compactness and stability of the stroller frame and enhancing the user's stroller experience. Furthermore, in this design, the engagement point between the stroller frame's linkage mechanism and the push rod assembly is located on the push rod assembly near the front support. This allows the push rod assembly to more effectively transfer its weight to the linkage mechanism during folding, thus improving its driving effect. Simultaneously, it allows for a relatively smaller linkage mechanism and a more compact arrangement of the linkage mechanism, front support, rear support, and push rod assembly, further reducing the overall size of the stroller frame. This enhances the compactness of the stroller frame after folding, thereby improving the user experience. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of a cart frame according to an embodiment of the present invention in an unfolded state;

[0036] Figure 2 for Figure 1 Another perspective view of the trolley frame;

[0037] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0038] Figure 4 for Figure 2 A magnified view of a portion of point A in the middle;

[0039] Figure 5 for Figure 2 A magnified view of a portion of point A in the middle;

[0040] Figure 6 for Figure 1 A schematic diagram of the folding process of the trolley frame;

[0041] Figure 7 for Figure 6 Another folding process diagram of the trolley frame;

[0042] Figure 8 for Figure 7 A schematic diagram of the trolley frame in its folded state;

[0043] Figure 9 This is a schematic diagram of another embodiment of the trolley frame of the present invention in its unfolded state;

[0044] Figure 10 for Figure 9 A magnified view of a portion of point B in the middle;

[0045] Figure 11 for Figure 9 A schematic diagram of the folding process of the trolley frame;

[0046] Figure 12 for Figure 11 Another folding process diagram of the trolley frame;

[0047] Figure 13 for Figure 12 A schematic diagram of the trolley frame in its folded state.

[0048] Explanation of icon numbers:

[0049]

[0050]

[0051] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0053] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0054] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0056] A stroller, also called a baby stroller, is primarily used for children to ride in. With the gradual development of strollers, more and more strollers are designed with a foldable structure for easier carrying and use. A stroller mainly consists of a stroller frame as the main structure and a fabric cover attached to the frame. Therefore, to achieve foldable storage, the stroller frame is designed with a foldable structure.

[0057] Currently, most folding stroller frames mainly consist of a front frame, a rear frame, and a push rod assembly, which are rotatably connected to achieve the folding capability. Furthermore, in actual design, for ease of grip and child seating, the angle between the push rod assembly and the rear frame is usually set relatively large, while the angle between the front and rear frames is relatively small. This means that when folding and storing, the front frame folds before the push rod assembly, and the push rod assembly folds sequentially. This uneven force distribution on the stroller frame affects both the compactness of the folding and the likelihood of creaking noises during the folding process, ultimately impacting the user experience.

[0058] Therefore, based on the above considerations, in order to solve the problem of significant lag in the folding of the push rod assembly when the front support and push rod assembly in the trolley frame are folded together, this application proposes a novel trolley frame. This trolley frame innovatively incorporates a linkage mechanism that connects to the front support, rear support, and push rod assembly. This linkage mechanism allows the push rod assembly to drive the front support away from the rear support first, and then fold towards the rear support, thereby reducing the lag in the push rod assembly's rotational folding and improving the synchronization between the front support and push rod assembly during the folding process. This reduces the front-to-back dimensions of the folded trolley frame and also improves the stability of the folding process, reducing abnormal noises. Furthermore, the engagement point between the linkage mechanism and the push rod assembly is located on the push rod assembly near the front support, allowing the push rod assembly to more fully utilize its own weight during the folding process, effectively driving the linkage mechanism's movement. At the same time, it also allows for a reduction in the size of the linkage mechanism, and a more compact distribution of the linkage mechanism, front support, rear support, and push rod assembly, thus reducing the overall size of the stroller frame. This synergistic effect of reducing the overall size of the stroller frame, the dimensions of the folded stroller frame, and the stability of the folding process significantly improves the compactness and stability of the stroller frame during folding, thereby greatly enhancing the user experience of the children's stroller.

[0059] The structure of the trolley frame proposed in this application will be explained and described below with reference to an embodiment. In one embodiment of this application, please refer to the reference. Figure 1 and Figure 2 ,as well as Figures 6 to 8The trolley frame 100 proposed in this application includes a front support 10, a rear support 20, a push rod assembly 30, and a linkage mechanism 50; two of the three components, namely the front support 10, the rear support 20, and the push rod assembly 30, are rotatably connected, and the third component is rotatably connected to at least one of the two components; the linkage mechanism 50 is connected to the front support 10, the rear support 20, and the push rod assembly 30, and the engagement position of the linkage mechanism 50 and the push rod assembly 30 (wherein, the engagement position is also the rotatable connection position of the two components, or the position of the rotation axis of the two components) is relative to the end of the push rod assembly 30 that is closer to the front support 10; when the push rod assembly 30 moves towards the rear support and folds, the push rod assembly 30 drives the front support 10 to move away from the rear support 20 and then towards the rear support 20 through the linkage mechanism 50, so that the front support 10 and the push rod assembly 30 move towards the rear support 20 simultaneously.

[0060] The front support 10 may have a rotatable front wheel 11 connected to one end, and the other end rotatably connected to at least one of the rear support 20 and the push rod assembly 30. The front support 10 may be a linear rod structure, an arc-shaped rod structure, or a combination of linear and arc-shaped rods. Furthermore, the cross-section of the front support 10 may be circular, elliptical, square, or rectangular. Therefore, this application does not limit the structural type or shape of the front support 10. Moreover, in the use state of the stroller, that is, when the stroller is unfolded and placed normally on the ground, the front support 10 may be tilted or vertically positioned. Therefore, this application does not limit the orientation of the front support 10.

[0061] The rear support 20 may have a rotatable rear caster 21 connected to one end, and the other end rotatably connected to at least one of the front support 10 and the push rod assembly 30. The rear support 20 can be a linear rod structure, an arc-shaped rod structure, or a combination of linear and arc-shaped rods. Furthermore, the cross-section of the rear support 20 can be circular, elliptical, square, or rectangular. Therefore, this application does not limit the structural type or shape of the rear support 20. In the unfolded state, the rear support 20 can be tilted or vertically positioned; thus, this application does not limit the orientation of the rear support 20. However, it should be noted that the rear support 20 and the front support 10 need to form a downward-facing angle to ensure the stroller can be placed stably on the ground for use.

[0062] The push rod assembly 30 provides a gripping position for convenient user handling. The push rod assembly 30 includes a lower push rod 31 and an upper push rod 33. One end of the lower push rod 31 is rotatably connected to at least one of the front support 10 and the rear support 20, and the other end is rotatably connected to one end of the upper push rod 33. A linkage mechanism 50 is connected to the lower push rod 31, and the engagement position of the linkage mechanism 50 and the lower push rod 31 is relative to the end of the lower push rod 31 closest to the front support 10. In this case, the lower push rod 31 can raise the height of the upper push rod 33, ensuring convenient user handling even when the length of the upper push rod 33 is relatively short. Simultaneously, the lower push rod 31 and the upper push rod 33 can be folded together to reduce the vertical dimension of the folded trolley frame 100. On the other hand, when the lower push rod 31 and the upper push rod 33 are folded and close together with the rear support 20, the folded lower push rod 31 and upper push rod 33 can also drive the front support 10 through the linkage mechanism 50. The lower push rod 31 can be a linear rod structure, an arc-shaped rod structure, or a combination of linear and arc-shaped rods. The cross-section of the lower push rod 31 can be circular, elliptical, square, or rectangular. Therefore, this application does not limit the structural type and shape of the lower push rod 31. Furthermore, when in the unfolded state, the included angle formed by the lower push rod 31 and the rear support 20 can be acute, right, or obtuse. This application does not limit the size of the included angle formed by the lower push rod 31 and the rear support 20. Similarly, the upper push rod 33 can be a linear rod structure, an arc-shaped rod structure, or a combination of linear and arc-shaped rods. The cross-section of the upper push rod 33 can be circular, elliptical, square, or rectangular. Therefore, this application does not limit the structural type or shape of the upper push rod 33. Furthermore, when in the unfolded state, the upper push rod 33 and the lower push rod 31 can be arranged at an angle or parallel to each other. When the upper push rod 33 and the lower push rod 31 are parallel, this can include cases where their center lines coincide or cases where their center lines are parallel and spaced apart. It should also be noted that the rotatable connection between the front support 10, the rear support 20, and the lower push rod 31, as well as the rotatable connection between the upper push rod 33 and the lower push rod 31, can be achieved through a hinge or by a connecting shaft. This application does not limit the connection method of the rotatable connection between the front support 10, the rear support 20, and the lower push rod 31, or the rotatable connection between the upper push rod 33 and the lower push rod 31.Furthermore, it should be noted that the limiting and locking of the front support 10, rear support 20, lower push rod 31, and upper push rod 33 in the unfolded state can be achieved by a limiting method in which the limiting pins are driven into the corresponding limiting holes by elastic elements after the trolley frame 100 has been rotated and unfolded to the correct position; alternatively, it can be achieved by a limiting method in which two magnetic elements attract each other after the trolley frame has been rotated and unfolded to the correct position. Therefore, this application does not limit the limiting method for the trolley frame 100 in the unfolded state.

[0063] The linkage mechanism 50 can drive the front support 10 to rotate when the upper push rod 33 and the lower push rod 31 fold together and approach the rear support 20. Specifically, the linkage mechanism 50 can drive the front support 10 to rotate first away from the rear support 20, and then towards the rear support 20, thus ensuring that the front support 10 folds and approaches the rear support 20 synchronously with the push rod assembly 30. The linkage mechanism 50 can include the first connecting member 51 and the second connecting member 52, as described below. Alternatively, the linkage mechanism 50 can include an angle sensor, a controller, and a motor. In this case, the angle sensor can detect the rotation angle of the upper push rod 33 and the lower push rod 31 when folding and approaching the rear support 20, and transmit this information to the controller. The controller can then control the motor to drive the front support 10 to first move away from the rear support 20, and then fold and approach the rear support 20, based on the rotation of the lower push rod 31. Therefore, this application does not limit the specific structure of the linkage mechanism 50. Additionally, it should be noted that the combination of upper push rod 33 and lower push rod 31 can be driven by the weight of the combination itself or manually by the user during the folding and closing process with the rear support 20.

[0064] Furthermore, to improve the overall structural stability of the trolley frame 100, the front support 10, rear support 20, lower push rod 31, upper push rod 33, and linkage mechanism 50 can constitute a set of side supports. In a direction parallel to the rotation axis of the front support 10, the trolley frame 100 can include two sets of spaced-apart side supports. Further, the trolley frame 100 can also include a connecting frame 80. The number of connecting frames 80 can be one, connecting two front supports 10, two rear supports 20, or two upper push rods 33. Alternatively, the number of connecting frames 80 can be at least two, connecting at least two of the two front supports 10, two rear supports 20, or two upper push rods 33.

[0065] In the trolley frame 100 of this application, during folding, the upper push rod 33 can first fold and approach the lower push rod 31. Then, during the process of the upper push rod 33 and lower push rod 31 combining, that is, the push rod assembly 30 folding and approaching the rear support 20, the push rod assembly 30 can drive the front support 10 away from the rear support 20 through the linkage mechanism 50, and then fold and approach the rear support 20. At this time, the time required for the front support 10 to complete folding and approaching the rear support 20 is extended, thereby reducing the possibility that the angle between the front support 10 and the rear support 20 is smaller than the angle between the rear support 20 and the push rod assembly 30, causing the front support 10 to complete folding and approaching the rear support 20 before the push rod assembly 30. In other words, due to the linkage mechanism 50, the stroller frame 100 in this solution improves the synchronization of the folding and closing of the front support 10 and the push rod assembly 30 on the rear support 20. This allows the rear support 20 to bear force evenly when the stroller frame 100 is folded, making it easier and quieter for the stroller frame 100 to fold. Consequently, it improves the compactness and stability of the stroller frame 100 during folding, thus enhancing the user's stroller experience. Moreover, in this solution, the engagement position of the linkage mechanism 50 and the push rod assembly 30 on the push rod assembly 30 is located at the end of the push rod assembly 30 closer to the front support 10. This allows the push rod assembly 30 to more fully exert its weight on the linkage mechanism 50 during the folding and closing process, thereby improving the driving effect on the linkage mechanism 30. At the same time, it also allows the linkage mechanism 30 to be set to a relatively small size, and the linkage mechanism 50, the front support 10, the rear support 20 and the push rod assembly 30 to be distributed more compactly, thereby reducing the overall size of the stroller frame 100. This further improves the compactness of the stroller frame 100 after folding, thereby further enhancing the user's experience of using the stroller.

[0066] Please refer to the reference. Figure 1 and Figure 2 ,as well as Figure 6 and Figure 7 In one embodiment of this application, the linkage mechanism 50 includes a first connector 51 and a second connector 52. The first connector 51 is rotatably connected to the front support 10, and the second connector 52 is rotatably connected to the first connector 51 and the rear support 20. When the lower push rod 31 is in the folded and close-to-the-rear-support-20 state, it can drive the first connector 51 and the second connector 52 to fold and close together, so as to drive the front support 10 to move away from the rear support 20 first, and then fold and close to the rear support 20.

[0067] In this embodiment, the linkage mechanism 50 is configured as a linkage structure including a first connecting member 51 and a second connecting member 52 that are rotatably connected. This allows the linkage mechanism 50 to be a mechanical physical structure, without involving circuits or pneumatic circuits, thereby simplifying the structure of the linkage mechanism 50 and improving the convenience of its installation. Furthermore, the linkage mechanism 50 can be folded, ensuring that it does not occupy excessive space when the trolley frame 100 is in a folded state, thus further improving the compactness of the folded trolley frame 100. The first connecting member 51 and the second connecting member 52 can be plate structures or rod structures; this application does not limit the structural shape of the first connecting member 51 and the second connecting member 52.

[0068] Please refer to the reference. Figure 2 and Figure 3 In one embodiment of this application, in the unfolded state, the line connecting the rotation axis of the first connector 51 and the front bracket 10 with the rotation axis of the second connector 52 and the rear bracket 20 is defined as the first axis line 51a; the rotation axis of the first connector 51 and the second connector 52 is located below the first axis line 51a; when the push rod assembly 30 is driven, the engagement position of the first connector 51 and the second connector 52 moves upward and drives the first connector 51 and the second connector 52 to fold upward;

[0069] In this embodiment, the engagement position of the first connector 51 and the second connector 52 is configured to be rotated upwards by the push rod assembly 30, and the rotation axis of the first connector 51 and the second connector 52 is located below the first axis line 51a. This allows the rotation axis of the first connector 51 and the second connector 52 to first move to the first axis line 51a, and then move to the upper side of the first axis line 51a, as the push rod assembly 30 moves the engagement position of the first connector 51 and the second connector 52 upwards. During this process, the first connector 51 and the second connector 52 can be pulled apart. During this process, the first connector 51 and the second connector 52 can be folded. At this time, the push rod assembly 30 drives the first connecting piece 51 and the second connecting piece 52 to first open and then fold, thereby driving the front support 10 to first move away from the rear support 20 and then fold towards the rear support 20. Moreover, by setting the rotation axis of the first connecting piece 51 and the second connecting piece 52 and the line 51a connecting the first axis in this way, the first connecting piece 51 and the second connecting piece 52 can be driven by the push rod assembly 30 to rotate in a single direction, thereby simplifying the movement of the first connecting piece 51 and the second connecting piece 52, simplifying the structure of the linkage mechanism 50 and making it easier for the push rod assembly 30 to drive the linkage mechanism 50. At the same time, since the rotation axis of the first connecting piece 51 and the second connecting piece 52 is located below the line 51a connecting the first axis, when the push rod assembly 30 rotates downwards, it can drive the end of the second connecting piece 52 away from the first connecting piece 51 to rotate downwards, thereby achieving the upward folding of the first connecting piece 51 and the second connecting piece 52. That is, at this time, the rotation directions of the push rod assembly 30 and the ends of the second connecting member 52 away from the first connecting member 51 are the same, which further improves the convenience of the push rod assembly 30 in driving the linkage mechanism 50, and further simplifies the connection between the linkage mechanism 50 and the push rod assembly 30. Of course, in other embodiments, it is also possible for the rotation axis of the first connecting member 51 and the second connecting member 52 to be located above the first axis line 51a. In this case, when the push rod assembly 30 is driven, the engagement position of the first connecting member 51 and the second connecting member 52 moves downward and drives the first connecting member 51 and the second connecting member 52 to move downward and fold together.

[0070] Please refer to reference 2 and... Figure 3 In one embodiment of this application, the length of the first axis connecting line 51a is defined as L1, and the distance between the rotation axis of the first connector 51 and the second connector 52 and the first axis connecting line 51a is defined as L2, satisfying the relationship: L2 / L1≤0.1.

[0071] In this embodiment, setting the ratio of L2 to L1 to less than or equal to 0.1 ensures that the distance between the rotation axes of the first connecting member 51 and the second connecting member 52 and the line 51a connecting the first axis is not too large. This allows the first connecting member 51 and the second connecting member 52 to extend the time for the front support 10 to fold towards the rear support 20 during the folding process without affecting the overall folding efficiency of the trolley frame 100. Simultaneously, it allows the first connecting member 51 and the second connecting member 52 to be distributed more compactly, reducing the volume of the linkage mechanism 50 and improving the compactness of subsequent folding. Therefore, this setting of the ratio range of L2 to L1 effectively balances the synchronicity of the folding and approaching of the front support 10 with the combination of the upper push rod 33 and the lower push rod 31, the overall folding efficiency of the trolley frame 100, and the compactness of the trolley frame 100 after folding. The ratio of L2 to L1 can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, or 0.1, or any value within the above range. This application does not limit the specific value of the ratio of L2 to L1.

[0072] To achieve a better balance between the synchronous folding of the front support 10, the upper push rod 33, and the lower push rod 31, the overall folding efficiency of the trolley frame 100, and the compactness of the trolley frame 100 after folding, please refer to Reference 2 and... Figure 4 In one embodiment of this application, the line connecting the rotation axis of the first connector 51 and the front bracket 10 with the rotation axis of the first connector 51 and the second connector 52 is defined as the second axis line 51b, and the line connecting the rotation axis of the first connector 51 and the second connector 52 with the rotation axis of the second connector 52 and the rear bracket 20 is defined as the third axis line 51c; the included angle formed by the front bracket 10 and the rear bracket 20 is α, and the included angle formed by the second axis line 51b and the third axis line 51c is β, satisfying the relationship: β / α≤2.5. The ratio of β to α can be 0.5, 1, 1.5, 2, or 2.5, or any value within the above range. This application does not limit the specific value of the ratio of β to α.

[0073] Please refer to Figure 2 and Figure 3 In the unfolded state, the engagement position of the first connector 51 and the second connector 52 is located close to the rear bracket 20.

[0074] In this embodiment, the rotation axes of the first connector 51 and the second connector 52 are positioned relatively close to the rear support 20. This allows for easier application of force to the second connector 52 when the push rod assembly 30 rotates downwards, thus enabling the second connector 52 to be driven. In other words, in the direction parallel to the line 51a connecting the first axes, the projected length between the rotation axes of the first connector 51 and the front support 10 and the rotation axes of the first connector 51 and the second connector 52 is defined as L3, and the projected length between the rotation axes of the first connector 51 and the second connector 52 and the rotation axis of the second connector 52 and the rear support 20 is defined as L4, satisfying the relationship: L4 < L3. Furthermore, in some embodiments, L4 and L3 can also satisfy the relationship: L4 / L3 ≤ 0.6, to further improve the driving effect of the push rod assembly 30 on the second connector 52. The ratio of L4 to L3 can be 0.1, 0.2, 0.3, 0.4, 0.5 or 0.6, or any value within the above range. This application does not limit the specific value of the ratio of L4 to L3.

[0075] Please refer to reference 2 and... Figure 3 In one embodiment of this application, the rotation axis of the first connector 51 and the front bracket 10 is positioned lower than the rotation axis of the second connector 52 and the rear bracket 20.

[0076] In this embodiment, the rotation axis of the first connector 51 and the front support 10 is positioned lower than that of the second connector 52 and the rear support 20. This allows the second connector 52 and the push rod assembly 30 to be closer together, facilitating their connection and reducing the size of the second connector 52, thus improving the compactness of the folding of the trolley frame 100. Furthermore, this arrangement creates a certain distance between the rotation axes of the first connector 51 and the front support 10, the rear support 20, and the push rod assembly 30, facilitating the movement of the first connector 51 and the second connector 52 on the front support 10 during folding. Specifically, the engagement position (i.e., the rotation axis position) of the second connector 52 and the rear support 20 is located on the rear support 20 near the front support 10, while the engagement position (i.e., the rotation axis position) of the first connector 51 and the front support 10 is located in the middle of the front support 10. Of course, in other embodiments, the rotation axis of the first connector 51 and the front bracket 10 may be at the same height as the rotation axis of the second connector 52 and the rear bracket 20, or the rotation axis of the first connector 51 and the front bracket 10 may be higher than the rotation axis of the second connector 52 and the rear bracket 20.

[0077] Please refer to reference 2 and... Figure 4In one embodiment of this application, the included angle formed by the front support 10 and the rear support 20 is defined as α, and the included angle formed by the first axis line 51a and the horizontal direction is defined as γ, satisfying the relationship: γ / α≤0.1.

[0078] In this embodiment, setting the ratio of γ to α to be less than or equal to 0.1 prevents the linkage mechanism 50 from becoming too large, thereby improving the compactness of the trolley frame 100 after folding. Simultaneously, it prevents the second connector 52 from being too close to the rotation axes of the front support 10, rear support 20, and push rod assembly 30, reducing the possibility of interference between the second connector 52 and the structure at the rotation axis during rotation. Therefore, this setting of the γ to α ratio range effectively balances the compactness of the trolley frame 100 after folding and the safety during the folding process. The value of the γ to α ratio can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, or 0.1, or any value within the above range. This application does not limit the specific value of the γ to α ratio.

[0079] Please refer to Figure 2 In one embodiment of this application, the first connector 51 is an arc-shaped structure, and in the unfolded state, the concave arc surface of the first connector 51 is disposed downward.

[0080] In this embodiment, the first connector 51 is designed as an arc-shaped structure, which allows it to meet the angle requirements of the front support 10 and the rear support 20 when unfolded with a relatively small volume. At the same time, this design also makes the shape of the first connector 51 more novel, which can improve the user's visual perception and further enhance the user experience.

[0081] To achieve the same effect, in one embodiment of this application, the end of the second connector 52 near the first connector 51 can also be configured as an arc-shaped structure, with the concave arc surface of the second connector 52 facing upwards in the unfolded state. Furthermore, to ensure that the first connector 51 and the second connector 52 can be folded more compactly after unfolding, in one embodiment of this application, in the unfolded state, the concave arc surface of the first connector 51 and the concave arc surface of the second connector 52 are tangent to each other, and the convex arc surface of the first connector 51 and the convex arc surface of the second connector 52 are tangent to each other.

[0082] Please refer to Figure 2 In one embodiment of this application, the end of the second connector 52 away from the first connector 51 extends between the rear bracket 20 and the lower push rod 31 of the push rod assembly 30, and is rotatably connected to the lower push rod 31.

[0083] In this embodiment, extending the end of the second connector 52 away from the first connector 51 to the side of the rear bracket 20 opposite to the front bracket 10 facilitates the connection between the second connector 52 and the lower push rod 31. Furthermore, configuring the second connector 52 and the lower push rod 31 as a rotatable connection ensures a constant connection between them, thereby improving the stability of the lower push rod 31's movement of the second connector 52. The second connector 52 and the lower push rod 31 can be indirectly rotatably connected via the third connector 53 described below. Of course, in other embodiments, the second connector 52 and the lower push rod 31 can also be directly rotatably connected. In addition, in some embodiments, the lower push rod 31 can also abut against and drive the second connector 52.

[0084] Please refer to the reference. Figure 1 and Figure 2 In one embodiment of this application, the linkage mechanism 50 further includes a third connector 53. One end of the third connector 53 is rotatably connected to the end of the second connector 52 away from the first connector 51, and the other end of the third connector 53 is rotatably connected to the lower push rod 31 of the push rod assembly 30. The engagement position of the third connector 53 and the lower push rod 31 is located relative to the position of the push rod assembly 30 near the front bracket 10.

[0085] In this embodiment, by providing a third connecting member 53, the length of the second connecting member 52 does not need to be excessive, thus reducing its volume. Furthermore, the lower push rod 31 of the push rod assembly 30, driven by the fourth connecting member 54, allows the third connecting member 53 to rotate a relatively large distance, enabling the front support 10 and the rear support 20 to come closer together after folding. This reduction in the volume of the second connecting member 52 and the closer folding of the front support 10 and the rear support 20 further improves the compactness of the trolley frame 100 after folding. The third connecting member 53 can be a plate structure or a rod structure; this application does not limit the structural shape of the third connecting member 53.

[0086] Please refer to the reference. Figure 2 and Figure 5 In one embodiment of this application, the distance between the rotation axis of the first connector 51 and the rotation axis of the second connector 52 and the rotation axis of the rear bracket 20 is defined as L5, and the distance between the rotation axis of the second connector 52 and the rear bracket 20 and the rotation axis of the second connector 52 and the third connector 53 is defined as L6. L6 is greater than L5, and the relationship 0.6≤L5 / L6≤0.8 can also be satisfied.

[0087] In this embodiment, the ratio of L5 to L6 is set to between 0.6 and 0.8. This ensures that the ratio is not too small, which would result in an excessively small radius of rotation for the end of the second connector 52 closest to the first connector 51, affecting the compactness of the folding between the front support 10 and the rear support 20. Conversely, it also ensures that the ratio is not too large, which would increase the resistance of the lower push rod 31 to the second connector 52. Therefore, this range of L5 and L6 effectively balances the compactness and smoothness of the trolley frame 100 during folding.

[0088] Please refer to Figure 2 In one embodiment of this application, in the unfolded state, the trolley frame 100 is defined to have a vertical direction, the opening of the angle formed by the front support 10 and the rear support 20 is set downward, and the rotation axis of the second connector 52 and the third connector 53 is higher than the rotation axis of the second connector 52 and the rear support 20.

[0089] In this embodiment, the rotation axes of the second connector 52 and the third connector 53 are set higher than the rotation axes of the second connector 52 and the rear support 20. On the one hand, this reduces the distance between the second connector 52 and the lower push rod 31, so that the length of the third connector 53 does not need to be relatively long, thus helping to reduce the size of the linkage mechanism 50. On the other hand, it also facilitates meeting the required rotational stroke of the second connector 52. Thus, through these two effects, the compactness of the trolley frame 100 after folding is further improved.

[0090] Please refer to Figure 2 In one embodiment of this application, the opening of the angle formed by the second connector 52 and the third connector 53 is opposite to the opening of the angle formed by the lower push rod 31 and the rear bracket 20.

[0091] In this embodiment, the second connector 52 and the third connector 53 are arranged at an angle, with the opening of the angle facing the opening of the angle formed by the lower push rod 31 and the rear support 20. This improves the compactness of the distribution of the second connector 52 and the third connector 53, further reducing the size of the linkage mechanism 50. On the other hand, it also facilitates the third connector 53 to apply force to the second connector 52, improving the convenience of the lower push rod 31 in driving the second connector 52. Specifically, in the unfolded state, the opening of the angle formed by the third connector 53 and the second connector 52 faces forward; when the push rod assembly 30 moves towards the rear support 20 and folds, the engagement position of the third connector 53 and the second connector 52 moves backward; and the engagement position of the first connector 51 and the second connector 52 moves upward.

[0092] Please refer to reference 2 and... Figure 4In one embodiment of this application, the included angle formed by the lower push rod 31 and the rear bracket 20 is defined as p, and the included angle formed by the second connector 52 and the third connector 53 is defined as m, satisfying the relationship: m / p≤1.5.

[0093] In this embodiment, setting the ratio of m to p to less than or equal to 1.5 ensures that the volume of the linkage mechanism 50 is not excessive, thereby improving the compactness of the trolley frame 100 after folding. Simultaneously, it facilitates the third connector 53 applying force to the second connector 52, thereby driving the second connector 52 to rotate. The ratio of m to p can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, or 0.15, or any value within the above range. This application does not limit the specific value of the ratio of m to p.

[0094] Please refer to the reference. Figure 1 and Figure 2 ,as well as Figures 6 to 8 In one embodiment of this application, the trolley frame 100 further includes a seat frame 60, which is rotatably connected to at least one of the front support 10, the rear support 20, and the lower push rod 31 in the push rod assembly 30; the linkage mechanism 50 further includes a fourth connector 54, which is rotatably connected to the seat frame 60 and rotatably connected to the second connector 52. In the folded state, the second connector 52 can drive the seat frame 60 to fold and close to the front support 10 through the fourth connector 54.

[0095] The seat frame 60 can be used for children to ride in. The seat frame 60 can be a U-shaped rod structure to improve its lightweight effect. Of course, the seat frame 60 can also be a plate structure; this application does not limit the structural shape of the seat frame 60.

[0096] In this embodiment, the fourth connector 54 enhances the linkage function of the linkage mechanism 50, so that when the push rod assembly 30 drives the front support 10 to fold through the linkage mechanism 50, it can also drive the seat frame 60 to fold, thereby further improving the compactness of the trolley frame 100 after folding.

[0097] Please refer to the reference. Figure 1 and Figure 2 ,as well as Figures 6 to 8In one embodiment of this application, one end of the fourth connector 54 is rotatably connected to the second connector 52 at a position close to the first connector 51; when folded, the engagement position of the fourth connector 54 and the second connector 52 (that is, the position of the rotation axis) is flipped with the second connector 52 and moves upward as a whole; the other end of the fourth connector 54 is rotatably connected to the rear end of the seat frame 60. In the folded state, the fourth connector 54 pushes the rear end of the seat frame 60 to flip upward, so that the front end of the seat frame 60 flips downward and approaches the front support 10.

[0098] In this embodiment, by rotatably connecting one end of the fourth connector 54 to the rear end of the seat frame 60, the first connector 51 and the second connector 52 can directly push the fourth connector 54 upward when folded together. In turn, the fourth connector 54 pushes the rear end of the seat frame 60 to rotate upward to achieve the folding and closing of the seat frame 60. At this time, the structures of the fourth connector 54 and the second connector 52 can be set to be relatively simple, which is conducive to simplifying the structural setting of the linkage mechanism 50 and improving the manufacturing convenience.

[0099] Please refer to the reference. Figure 1 and Figure 2 ,as well as Figures 6 to 8 In one embodiment of this application, the stroller frame 100 further includes a backrest 70, which is rotatably connected to the seat frame 60 and / or a fourth connector 54. The end of the fourth connector 54 away from the rotatably connected second connector 52 is rotatably connected to the end of the seat frame 60 near the backrest 70, so that when the first connector 51 and the second connector 52 are folded and close together, the end of the seat frame 60 near the backrest 70 can be driven to rotate upward through the fourth connector 54, and the end of the backrest 70 away from the seat frame 60 can rotate downward under the weight of the backrest 70 itself.

[0100] The backrest 70 can be used for children to lean against, further improving the stability of children while riding. The backrest 70 can be a U-shaped rod structure to improve its lightweight effect. Of course, the backrest 70 can also be a plate structure; this application does not limit the structural shape of the backrest 70. Furthermore, the backrest 70 can be rotatably connected to the seat frame 60, or rotatably connected to the fourth connector 54, or connected to both the seat frame 60 and the fourth connector 54. It should also be noted that the end of the backrest 70 away from the seat frame 60 can be connected to the lower push rod 31 and / or the upper push rod 33 via a fabric sleeve.

[0101] In this embodiment, the fourth connector 54 is further rotatably connected to the backrest 70, so that when the fourth connector 54 drives the end of the seat frame 60 near the backrest 70 to rotate upwards, the end of the backrest 70 near the seat frame 60 can be lifted accordingly. At this time, due to the lifting effect of the seat frame 60, the backrest 70 will not hit the ground during the folding process of the trolley frame 100. This allows the folding of the trolley frame 100 to be achieved without the backrest 70 being modified, thereby simplifying the structure of the trolley frame 100. The interrupted design means that it needs to be cut into at least two parts to accommodate the folding of the trolley frame 100.

[0102] The above describes how the rear end of the seat frame 60 is rotated upwards by the fourth connector 54 to achieve folding of the seat frame 60. In one embodiment of this application, the front end of the seat frame 60 can also be rotated downwards by the fourth connector 54 to achieve folding of the seat frame 60. Please refer to the references. Figure 9 and Figure 10 One end of the fourth connector 54 is rotatably connected to the second connector 52; the other end of the fourth connector 52 is rotatably connected to the seat frame 60. In the folded state, the fourth connector 54 pulls the front end of the seat frame 60 to flip downward and close to the front support 10.

[0103] In this embodiment, the fourth connector 54 pulls the front end of the seat frame 60 downwards to gradually fold and close the seat frame 60. This makes the folding and closing process of the seat frame 60 smoother and reduces the possibility of abnormal noises and large collisions. The folding process can be referenced from... Figures 11 to 13 , Figure 13 This is a schematic diagram of the stroller frame after it has been folded 100%.

[0104] Please refer to the reference. Figure 9 and Figure 10 In one embodiment of this application, the second connector 52 has a body 521 and a connecting segment 523 extending outward from the body 521. When folded, the connecting segment 523 rotates backward as a whole with the second connector 52. The connecting segment 523 engages with the fourth connector 54, and the engagement position is located above the engagement position of the first connector 51 and the second connector 52. The engagement position of the fourth connector 54 and the seat 60 is located in front of the engagement position of the seat 60 with at least one of the front support 10, the rear support 20, and the push rod assembly 30.

[0105] In this embodiment, the second connector 52 is configured to have a body 521 and a connecting segment 523. The connecting segment 523 is rotatably connected to the fourth connector 54, so that when the first connector 51 and the second connector 52 are folded together, the joint between the connecting segment 523 and the fourth connector 54 can be easily rotated. Thus, the folding and closing of the connecting segment 523 and the fourth connector 54 achieves smooth driving of the front end of the seat frame 60.

[0106] Please refer to the reference. Figure 9 and Figure 10 In one embodiment of this application, both the connecting segment 523 and the fourth connecting member 54 can be configured as arc-shaped structures. When the trolley frame 100 is in its normally unfolded state, the concave arc surface of the connecting segment 523 can face downwards and forwards, and the concave arc surface of the fourth connecting member 54 can face upwards and backwards, so that the structure is more compact and the seat frame 60 can be more stably close to the side support after folding and closing. Of course, in other embodiments, the connecting segment 523 and the fourth connecting member 54 can also be configured as linear structures. This application does not limit the shape and structure of the connecting segment 523 and the fourth connecting member 54.

[0107] Please refer to the reference. Figure 1 and Figure 6 In one embodiment of this application, the backrest 70 is rotatably connected to the fourth connector 54, and the rotation axes of the seat frame 60 and the fourth connector 54 are spaced apart from the rotation axes of the fourth connector 54 and the backrest 70.

[0108] In this embodiment, the backrest 70 and seat frame 60 are rotatably connected to different positions of the fourth connector 54. This facilitates the connection structure and improves the ease of rotatable connection between them. Furthermore, the extension of the fourth connector 54 can also extend the seat frame 60, reducing the size of the backrest 70 and seat frame 60 and thus minimizing their protrusion at the folded top, further improving the compactness of the trolley frame 100 when folded. The fourth connector 54 can be configured as two segments angled together. One end of one segment is rotatably connected to the second connector 52, and both ends of the other segment are rotatably connected to the backrest 70 and seat frame 60, respectively. This design allows the fourth connector 54 to provide convenient connection points while simplifying its structure and reducing its volume, thereby improving the compactness of the trolley frame 100.

[0109] In one embodiment of this application, the push rod assembly 30 can, under the action of gravity, drive the front support 10 away from the rear support 20 through the linkage mechanism 50, and then fold and move closer to the rear support 20.

[0110] In this embodiment, the push rod assembly 30 is configured to drive the front support 10 to move under the action of gravity via the linkage mechanism 50, which can improve the convenience of using the trolley frame 100 and further enhance the user experience. Specifically, when the push rod assembly 30 includes a lower push rod 31 and an upper push rod 33 as described above, the folded lower push rod 31 and upper push rod 33, combined, can drive the front support 10 to move under the action of gravity via the linkage mechanism 50.

[0111] Please refer to the reference. Figure 1 , Figure 4 as well as Figure 6 In one embodiment of this application, the included angle formed by the front support 10 and the rear support 20 is defined as α, and the included angle formed by the lower push rod 31 in the push rod assembly 30 and the rear support 20 is defined as p, satisfying the relationship: 0.7≤α / p≤1.1.

[0112] In this embodiment, the ratio of α to p is set to 0.7 to 1.1, which can better balance the stability of the stroller on the ground and the comfort of the user's grip posture. At the same time, with the linkage mechanism 50, the synchronization of the combination of the lower push rod 31 and the upper push rod 33 with the folding of the front support 10 and the rear support 20 can be further improved.

[0113] Please refer to Figure 2 In one embodiment of this application, the lower push rod 31 and the upper push rod 33 in the push rod assembly 30 are arranged in parallel.

[0114] In this embodiment, the lower push rod 31 and the upper push rod 33 are set to be parallel, which allows the user to have a more comfortable grip on the upper push rod 33, thereby further improving the user experience of the stroller. At the same time, it also facilitates the docking of the lower push rod 31 and the upper push rod 33 without having to consider the installation angle, thus improving the convenience of connecting the two.

[0115] Please refer to the reference. Figure 2 ,as well as Figures 6 to 8 In one embodiment of this application, the rear support 20 is connected to a rotatable rear moving wheel 21 at the end away from the front support 10 and / or the lower push rod 31; in the folded state, the trolley frame 100 is supported on a support surface (which can also be said to be the ground) through the rotatable connection between the rear moving wheel 21 and the lower push rod 31 and the upper push rod 33.

[0116] In this embodiment, after folding, the stroller frame 100 can be supported on the support surface by the rotatable connection between the rear movable wheel 21 and the lower push rod 31 and the upper push rod 33. This allows the stroller frame 100 to stand stably and automatically after folding, thereby further improving the convenience of using the stroller and enhancing the user experience. To further improve the stability of the stroller frame 100 when standing upright after folding, in one embodiment of this application, a rotating joint 311 is formed at the rotatable connection between the lower push rod 31 and the upper push rod 33, and the rotating joint 311 forms an abutment plane 311a; in the folded state, the stroller frame 100 is supported on the support surface by the rear movable wheel 21 and the abutment plane 311a.

[0117] Please refer to the reference. Figure 2 ,as well as Figures 6 to 8 In one embodiment of this application, the folding process of the trolley frame 100 proposed in this application can be as follows: First, the upper push rod 33 in the push rod assembly 30 is folded and brought closer to the lower push rod 31; then, the combination of the upper push rod 33 and the lower push rod 31 can rotate downwards and fold under its own weight; at the same time, the lower push rod 31 can drive the front support 10 away from the rear support 20 through the linkage mechanism 50, and then fold and bring closer to the rear support 20. The lower push rod 31 can also drive the seat frame 60 and the backrest 70 to rotate upwards through the linkage mechanism 50, so that the seat frame 60 is folded and brought closer to the rear support 20, and the backrest 70 is also folded and brought closer to the rear support 20 under the action of its own weight, thereby completing the folding of the trolley frame 100, and after folding, it stands stably on the support surface through the rear moving wheel 21 and the contact plane 311.

[0118] This application also proposes a stroller, which includes a stroller frame 100. The specific structure of the stroller frame 100 is as described in the above embodiments. Since this stroller adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0119] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A stroller frame, characterized in that, Includes front bracket, rear bracket, push rod assembly, and linkage mechanism; Two of the front bracket, the rear bracket, and the push rod assembly are rotatably connected, and the third component is rotatably connected to at least one of the two components. The linkage mechanism is connected to the front bracket, the rear bracket, and the push rod assembly. The engagement position of the linkage mechanism and the push rod assembly is located at one end of the push rod assembly closer to the front bracket. When the push rod assembly moves toward the rear support and folds, the push rod assembly drives the front support to move away from the rear support and then toward the rear support through the linkage mechanism, so that the front support and the push rod assembly move toward the rear support synchronously. The linkage mechanism includes a first connector and a second connector. The first connector is rotatably connected to the front support, and the second connector is rotatably connected to the first connector and the rear support. In the unfolded state, the line connecting the rotation axis of the first connector and the front support and the rotation axis of the second connector and the rear support is defined as the first axis line. The rotation axis of the first connector and the second connector is located on one side of the first axis line. The trolley frame also includes a seat frame, which is rotatably connected to at least one of the front support, the rear support, and the push rod assembly; the linkage mechanism also includes a fourth connector, which is rotatably connected to the seat frame and rotatably connected to the second connector. In the folded state, the second connector can drive the seat frame to fold and close to the front support through the fourth connector.

2. The cart frame as described in claim 1, characterized in that, The rotation axis of the first connector and the second connector is located below the line connecting the first axis; when the push rod assembly is driven, the engagement position of the first connector and the second connector moves upward and drives the first connector and the second connector to move upward and fold together; or, The rotation axis of the first connector and the second connector is located above the line connecting the first axis; when the push rod assembly is driven, the engagement position of the first connector and the second connector moves downward and drives the first connector and the second connector to fold downward.

3. The cart frame as described in claim 2, characterized in that, In the unfolded state, the engagement position of the first connector and the second connector is located close to the rear bracket; And / or, the engagement position of the second connector and the rear bracket is located relative to one end of the rear bracket near the front bracket; And / or, the engagement position of the first connector and the front bracket is located at the middle position on the front bracket; And / or, when the rotation axis of the first connector and the second connector is located below the line connecting the first axis, the first connector has an arc-shaped structure, and in the unfolded state, the concave arc surface of the first connector faces downward; the end of the second connector near the first connector has an arc-shaped structure, and in the unfolded state, the concave arc surface of the second connector faces upward; in the unfolded state, the concave arc surface of the first connector and the convex arc surface of the second connector are tangent, and the convex arc surface of the first connector and the concave arc surface of the second connector are tangent.

4. The cart frame as described in claim 2, characterized in that, In the unfolded state, the end of the second connector away from the first connector extends between the rear bracket and the push rod assembly; The linkage mechanism further includes a third connector, one end of which is rotatably connected to the end of the second connector away from the first connector, and the other end of which is rotatably connected to the push rod assembly. The engagement position of the third connector and the push rod assembly is located relative to the push rod assembly near the front bracket.

5. The trolley frame as described in claim 4, characterized in that, The distance between the rotation axis of the first connector and the second connector and the rotation axis of the second connector and the rear bracket is defined as L5, and the distance between the rotation axis of the second connector and the rear bracket and the rotation axis of the second connector and the third connector is defined as L6, where L6 is greater than L5; wherein, L5 and L6 satisfy the following condition: 0.6≤L5 / L6≤0.8; And / or, in the unfolded state, the trolley frame is defined to have a vertical direction, with the opening of the angle formed by the front support and the rear support facing downwards, and the rotation axis of the second connector and the third connector positioned higher than the rotation axis of the second connector and the rear support; the opening of the angle formed by the second connector and the third connector is opposite to the opening of the angle formed by the push rod assembly and the rear support; in the unfolded state, the opening of the angle formed by the third connector and the second connector faces forward; when the push rod assembly moves towards the rear support and folds, the engagement position of the third connector and the second connector moves backwards; the engagement position of the first connector and the second connector moves upwards.

6. The cart frame as described in claim 1, characterized in that, One end of the fourth connector is rotatably connected to the second connector at a position close to the first connector; when folded, the engagement position of the fourth connector and the second connector flips with the second connector and moves upward as a whole; The other end of the fourth connector is rotatably connected to the rear end of the seat frame. In the folded state, the fourth connector pushes the rear end of the seat frame to flip upward so that the front end of the seat frame flips downward and moves closer to the front support.

7. The cart frame as described in claim 1, characterized in that, One end of the fourth connector is rotatably connected to the second connector; The other end of the fourth connector is rotatably connected to the seat frame. In the folded state, the fourth connector pulls the front end of the seat frame downward and flips it close to the front support.

8. The trolley frame as described in claim 7, characterized in that, The second connector has a body and a connecting segment extending outward from the body. When folded, the connecting segment rotates rearward as a whole with the second connector. The connecting segment engages with the fourth connector, and the engagement position is located above the engagement position of the first connector and the second connector. The engagement position of the fourth connector and the seat frame is located in front of the engagement position of the seat frame with at least one of the front support, the rear support, and the push rod assembly.

9. The cart frame as described in claim 1, characterized in that, The trolley frame also includes a backrest, which is rotatably connected to the seat frame and / or the fourth connector. The end of the fourth connector away from the rotatably connected second connector is rotatably connected to the end of the seat frame near the backrest, so that when the first and second connectors are folded and close together, the end of the seat frame near the backrest can be rotated upwards via the fourth connector, and the end of the backrest away from the seat frame can be rotated downwards under its own weight. The backrest is rotatably connected to the fourth connector, and the rotation axes of the seat frame and the fourth connector are spaced apart from the rotation axes of the fourth connector and the backrest.

10. The stroller frame as described in any one of claims 1 to 9, characterized in that, The push rod assembly includes a lower push rod and an upper push rod, one end of the lower push rod being rotatably connected to the front bracket and / or the rear bracket, and the other end being rotatably connected to the upper push rod; The linkage mechanism is connected to the lower push rod. When the push rod assembly is folded, it can drive the front bracket to move under the action of gravity through the linkage mechanism.

11. The trolley frame as described in claim 10, characterized in that, The rear support is connected to a rotatable rear moving wheel at the end away from the front support and / or the lower push rod; a rotating joint is formed at the rotatable connection between the lower push rod and the upper push rod, and the rotating joint forms an abutting plane; in the folded state, the trolley frame is supported on the support surface by the rear moving wheel and the abutting plane; And / or, define the included angle formed by the front support and the rear support as α, and the included angle formed by the push rod assembly and the rear support as p, satisfying the relationship: 0.7≤α / p≤1.

1.

12. A children's stroller, characterized in that, Includes the trolley frame as described in any one of claims 1 to 11.

Images