Folding rotating mechanism and foldable baby carriage

Abstract

The utility model discloses a folding rotating mechanism and a foldable baby carriage. The folding rotating mechanism comprises a base support rod, a first support rod, a second support rod and a connecting rod transmission assembly. The first support rod comprises a body, a first branch and a second branch, wherein the first branch and the second branch extend out of the upper end of the body. The first branch is rotationally connected with the base bracket rod; the second branch is rotationally connected with the second bracket rod, so that the first bracket rod and the second bracket rod are relatively unfolded or relatively folded; one end of the connecting rod transmission assembly is rotationally connected to the first branch, and the other end is connected with the second bracket rod; by the adoption of the technical scheme, two relatively independent rotating connection structures are formed and dispersed to two relatively independent positions, mutual interference is reduced, and balance and stability of the folding rotating mechanism are improved; therefore, when the first support rod and the second support rod are relatively unfolded or folded, a more stable geometric structure can be formed, and the stability of the folding rotating mechanism when bearing external force is improved.

Description

Technical Field

[0001] The present application relates to the technical field of child strollers, and in particular to a folding and rotating mechanism and a foldable child stroller. Background Art

[0002] In the prior art, the design of children's products such as strollers, child seats, and child beds often focuses on portability and versatility to meet the needs of use in different occasions. Therefore, these products generally adopt a folding and rotating design, which uses multiple rods to rotate and connect to each other to achieve relative expansion or folding, making it easier for users to store and carry.

[0003] The folding and rotating mechanism, as a key component connecting the various rods, has a significant impact on the overall user experience and durability of the product. In particular, while the concentric rotation of the three support rods allows for folding and collapsing, all folding-related components, such as the folding lock and universal wheel locking linkage, are concentrated at the concentric rotation point, making the structure of this area extremely complex. This complexity not only increases manufacturing difficulty and cost but also increases the risk of product failure or damage over long-term use. Furthermore, the complex structure also requires increased maintenance. Users must carefully operate and maintain these functional components to avoid damage caused by improper use or negligence. However, most users may not have the expertise and skills to handle this complex maintenance, further increasing the difficulty and cost of product use. Furthermore, the concentric rotation structure may affect product stability and safety. Since all rods rotate around a common center point, loosening or damage to a rod or rotating joint when the product is unfolded can compromise the stability of the entire product and even lead to safety hazards. Utility Model Content

[0004] In view of the above problems, the present application provides a folding and rotating mechanism that is simple in structure, reliable and easy to maintain, which solves the problems of the existing folding and rotating mechanism such as complex structure, high maintenance requirements and potential safety risks.

[0005] To achieve the above-mentioned purpose, the present application provides a folding and rotating mechanism, which includes a base support rod, a first support rod, a second support rod and a connecting rod transmission assembly; the first support rod includes a main body and a first branch and a second branch extending from the upper end of the main body respectively; the first branch is rotatably connected to the base support rod; the second branch is rotatably connected to the second support rod so that the first support rod and the second support rod are relatively unfolded or relatively folded; one end of the connecting rod transmission assembly is rotatably connected to the first branch, and the other end is connected to the second support rod.

[0006] Furthermore, one end of the connecting rod transmission assembly rotates around the rotation center of the first branch and the base support rod.

[0007] Furthermore, the other end of the connecting rod transmission assembly is connected to the rotation connection between the second bracket rod and the second branch.

[0008] Furthermore, the first branch and the second branch respectively extend outwardly from the upper end portion of the main body of the first bracket rod, and the first branch and the second branch are relatively far apart.

[0009] Furthermore, the connecting rod transmission assembly includes a first connecting rod, a second connecting rod and a telescopic member; one end of the first connecting rod is rotatably connected to the first branch, and the other end is connected to one end of the second connecting rod; the other end of the second connecting rod is rotatably connected to the movable end of the telescopic member; the fixed end of the telescopic member is connected to the second support rod and forms an angle with the second support rod.

[0010] Furthermore, the telescopic member includes a sliding rod and a sleeve, the sliding rod is connected to the second support rod and forms an angle with the second support rod; the sleeve is slidably connected to the outside of the sliding rod and is rotatably connected to the other end of the second connecting rod.

[0011] Furthermore, the connecting rod transmission assembly also includes a guide rod, which is rotatably connected to the movable end of the telescopic member, and the first branch is provided with a first guide groove along its extension direction; when the second branch and the second bracket rod rotate relative to each other, the guide rod moves in the first guide groove.

[0012] Furthermore, the first branch is provided with a second guide groove corresponding to the rotation trajectory of the first connecting rod, and the first connecting rod is provided with a limiting protrusion corresponding to the second guide groove; when the second branch and the second bracket rod rotate relative to each other, the limiting protrusion moves in the second guide groove.

[0013] Furthermore, the second guide groove passes through both sides of the first branch.

[0014] Furthermore, when the limiting protrusion rotates to the middle of the second guide groove, the first support rod and the second support rod are in an unfolded state; when the limiting protrusion rotates to both ends of the second guide groove respectively, the first support rod and the second support rod are relatively folded.

[0015] Furthermore, the first guide groove is communicated with the second guide groove.

[0016] On the other hand, the present application also provides a foldable children's stroller, which includes a stroller frame, a front wheel assembly and a rear wheel assembly; the stroller frame includes two folding and rotating mechanisms on the left and right sides, and the folding and rotating mechanisms are the above-mentioned folding and rotating mechanisms; the front wheel assembly is arranged at the bottom of the second support rod; the rear wheel assembly is arranged at the bottom of the first support rod.

[0017] The folding and rotating mechanism of the above technical solution comprises a base support rod, a first support rod, a second support rod and a connecting rod transmission assembly; through the first branch and the second branch respectively extending from the upper end of the first support rod, the base support rod is rotatably connected to the first branch, and the second support rod is rotatably connected to the second branch, so that the base support rod is rotatably connected to the first branch and the second support rod is rotatably connected to the second branch to form two relatively independent rotating connection structures, which are dispersed to two relatively independent positions, reduce mutual interference, avoid the complexity of highly concentrated functional components in the concentric rotation design of the base support rod, the first support rod and the second support rod, simplify the overall structure, and reduce The difficulty and cost of manufacturing and maintenance are reduced, while production efficiency is improved; at the same time, it also avoids excessive concentration of all functional components on one side, thereby improving the balance and stability of the folding and rotating mechanism; the two relatively independent rotating connection structures allow the first support rod and the second support rod to have greater freedom when unfolding or folding, and one end of the connecting rod transmission assembly is rotatably connected to the first branch, and the other end is connected to the second support rod to adjust the angle and relative position between the first support rod and the second support rod, so that the first support rod and the second support rod can form a more stable geometric structure when they are relatively unfolded or folded, thereby improving the stability of the folding and rotating mechanism when subjected to external force, and ensuring reliability under long-term use.

[0018] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of this application. In order to enable ordinary technicians in this field to understand the technical solution of this application more clearly, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purposes and other purposes, features and advantages of this application easier to understand, the following is an explanation in combination with the specific implementation methods and drawings of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present invention and other related contents, and are not to be considered as limiting the present application.

[0020] In the drawings of the specification:

[0021] Figure 1 This is a schematic diagram of the folding and rotating mechanism in the unfolded state according to the specific embodiment;

[0022] Figure 2 This is a schematic diagram of a first folded state of the folding and rotating mechanism described in the specific embodiment;

[0023] Figure 3 This is a schematic diagram of a second folding state of the folding and rotating mechanism described in the specific embodiment;

[0024] Figure 4 This is a schematic diagram of the foldable baby stroller in the unfolded state according to the specific embodiment;

[0025] Figure 5 This is a schematic diagram of a partially folded state of the foldable child stroller according to a specific embodiment;

[0026] Figure 6 This is a schematic diagram of a foldable child stroller in a folded state according to a specific embodiment.

[0027] The reference numerals in the above drawings are described as follows:

[0028] 10. Base support rod;

[0029] 20. First support rod;

[0030] 201. Subject;

[0031] 202, first branch;

[0032] 2021, first guide groove; 2022, second guide groove;

[0033] 203, second branch;

[0034] 30. Second support rod;

[0035] 40. Connecting rod transmission assembly;

[0036] 401, first connecting rod;

[0037] 402, second connecting rod;

[0038] 403, telescopic parts;

[0039] 4031, slide rod; 4032, sleeve; 40321, connection part;

[0040] 404, guide rod;

[0041] 50. Front wheel assembly;

[0042] 60. Rear wheel assembly;

[0043] α, the angle between the central axis of the main body and the central axis of the first branch;

[0044] β, the angle between the central axis of the first branch and the central axis of the second branch. DETAILED DESCRIPTION

[0045] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0046] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0047] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0048] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0049] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0050] Without further limitations, in this application, the words "include", "comprise", "have" or other similar open-ended expressions used in sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product that includes the elements, so that the process, method or product that includes a series of elements may include not only those defined elements, but also other elements that are not explicitly listed, or also include elements inherent to such process, method or product.

[0051] Consistent with the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this manner, such as "multiple groups," "multiple times," etc., unless otherwise specifically defined.

[0052] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present application.

[0053] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a direct connection, or an indirect connection through an intermediate medium; it can be a relationship in which two components are combined together, or an interaction relationship between two components, or a communication between two structures. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0054] Combine Figures 1 to 3 With reference to the embodiment shown, the structure of the folding and rotating mechanism is described in detail below.

[0055] A folding and rotating mechanism includes a base support rod 10, a first support rod 20, a second support rod 30 and a connecting rod transmission assembly 40; the first support rod 20 includes a main body 201 and a first branch 202 and a second branch 203 extending from the upper end of the main body 201 respectively; the first branch 202 is rotatably connected to the base support rod 10; the second branch 203 is rotatably connected to the second support rod 30, so that the first support rod 20 and the second support rod 30 are relatively unfolded or folded; one end of the connecting rod transmission assembly 40 is rotatably connected to the first branch 202, and the other end is connected to the second support rod 30.

[0056] The sizes and lengths of the base support rod 10, first support rod 20, and second support rod 30 can be set according to actual needs, and the shapes of the base support rod 10, first support rod 20, and second support rod 30 are not limited. The cross-sectional shapes of the base support rod 10, first support rod 20, and second support rod 30 can be commonly found in circular, elliptical, polygonal, and other shapes. Similarly, the sizes and lengths of the first branch 202 and second branch 203 are adjusted based on the sizes and lengths of the first support rod 20 and second support rod 30 to meet the size and design requirements of the folding and rotating mechanism. Similarly, the cross-sectional shapes of the first branch 202 and second branch 203 can be set based on the cross-sectional shapes of the base support rod 10 and second support rod 30. In some embodiments, the outer periphery of the rotational connection between the second branch 203 and the second support rod 30 transitions smoothly from the outer periphery of the non-rotational connection between the second support rod 30, avoiding abrupt turns or sharp corners. This ensures that the appearance of the rotational connection between the second branch 203 and the second support rod 30 maintains a smooth line, significantly enhancing the overall aesthetics of the product.

[0057] The first support rod 20 includes a main body 201 and a first branch 202 and a second branch 203 extending from the upper end of the main body 201, so that the base support rod 10 is rotatably connected to the first branch 202 and the second support rod 30 is rotatably connected to the second branch 203, forming two relatively independent rotational connection structures, which are dispersed to two relatively independent positions. That is, there is a gap between the first branch and the second branch 203, and the two can be relatively parallel, relatively close, or relatively far apart. Figures 1 to 3 As shown, in some embodiments, the first branch 202 and the second branch 203 extend outward from the upper end of the main body 201 of the first support rod 20, and the first branch 202 and the second branch 203 are relatively far apart to avoid interference and conflict between the rotational connection between the base support rod 10 and the first branch 202 and the rotational connection between the second support rod 30 and the second branch 203. The angle α between the central axis of the main body and the central axis of the first branch, the angle β between the central axis of the first branch and the central axis of the second branch, and the angle between the central axis of the main body 201 and the central axis of the second branch 203 can be designed according to needs to achieve optimal stability and folding effect. See Figure 2 As shown, in some embodiments, the angle α between the central axis of the main body and the central axis of the first branch and the angle β between the central axis of the first branch and the central axis of the second branch are both obtuse angles, which help to disperse external loads, reduce single-point force, and improve the stability and anti-overturning ability of the entire folding and rotating mechanism.

[0058] One end of the connecting rod transmission assembly 40 is rotatably connected to the first branch 202. This connection is not limited to a specific position on the first branch 202, but can be flexibly selected according to design requirements. Specifically, one end of the connecting rod transmission assembly 40 can be directly connected to a certain point on the first branch 202 to achieve direct force transmission and rotation; in some embodiments, one end of the connecting rod transmission assembly 40 is rotated around the first branch 202 and the rotation center of the base support rod 10, so that the connecting rod transmission assembly 40 can more effectively utilize the mechanical advantages of rotation, more effectively balance and transmit the force generated during folding or unfolding, thereby enhancing the stability and efficiency of the entire folding mechanism and achieving a smoother and more fluid folding and unfolding action; at the same time, the limited space inside the trolley can be more effectively utilized, making the folded trolley more compact and portable.

[0059] The connection method between the other end of the connecting rod transmission assembly 40 and the second support rod 30 is also highly flexible. This connection is not limited to a specific position on the second support rod 30, but can be diversified according to the needs and design concepts of the overall structure. Specifically, the other end of the connecting rod transmission assembly 40 can be directly connected to a certain part of the second support rod 30, achieving coordination of force transmission and movement through direct connection. In some embodiments, the other end of the connecting rod transmission assembly 40 is precisely connected to the rotational connection between the second support rod 30 and the second branch 203, which also effectively utilizes the limited space inside the cart, making the overall structure more compact and simple, and improving the product's aesthetics and portability.

[0060] The second branch 203 is rotatably connected to the second support rod 30 so that the first support rod 20 and the second support rod 30 can be relatively unfolded or folded.

[0061] When the first support rod 20 and the second support rod 30 are relatively unfolded, the second support rod forms an obtuse angle with the main body, thereby having good supporting force.

[0062] When the first support rod 20 and the second support rod 30 are in the folded state, the second support rod 30 and the main body 201 are relatively close to each other, that is, the second support rod 30 will approach the main body 201 along the same direction as the main body 201. At this time, the second support rod 30 and the main body 201 form a small acute angle, so that the two are visually parallel or nearly parallel (see Figure 2 and Figure 3 This helps reduce the volume after folding, making it easier to carry and store.

[0063] Among them, when the first support rod 20 and the second support rod 30 are in a folded state, the positional relationship between the two can include the following situations: one is that the second support rod 30 is outside the first support rod 20, that is, the second support rod 30 and the first support rod 20 are staggered along the direction of their rotation axis; the second is that part of the second support rod 30 is inside the second branch 203, and the second branch has a receiving groove facing the second support rod 30. When the second support rod 30 moves closer to the main body 201, it will be partially or completely embedded in the receiving groove.

[0064] One end of the connecting rod transmission assembly 40 is rotatably connected to the first branch 202, and the other end is connected to the second support rod 30 to adjust the angle and relative position between the first support rod 20 and the second support rod 30, so that the first support rod 20 and the second support rod 30 can form a more stable geometric structure when they are relatively unfolded or folded, thereby improving the stability of the folding and rotating mechanism when subjected to external forces. Figures 1 to 3 As shown, specifically, the connecting rod transmission assembly 40 may include a first connecting rod 401, a second connecting rod 402, and a telescopic member 403; one end of the first connecting rod 401 is rotatably connected to the first branch 202, and the other end is connected to one end of the second connecting rod 402; the other end of the second connecting rod 402 is rotatably connected to the movable end of the telescopic member 403; the fixed end of the telescopic member 403 is connected to the second support rod 30 and forms an angle with the second support rod 30. During the relative expansion or folding of the first support rod 20 and the second support rod 30, one end of the first connecting rod 401 rotates on the first branch 202, and the second connecting rod 402 moves upward or downward. Due to the changes in the relative position and angle between the first connecting rod 401 and the second connecting rod 402, the movable end of the telescopic member 403 moves to provide necessary displacement compensation.

[0065] During the movement of the connecting rod transmission assembly 40, the telescopic member 403 generates a certain amount of displacement due to changes in the relative position and angle between the first connecting rod 401 and the second connecting rod 402. Through its telescopic function, the telescopic member 403 can flexibly provide this necessary displacement compensation, ensuring smooth and coordinated movement of the connecting rod transmission assembly 40. The telescopic member 403 can be a pneumatic cylinder, an electric push rod, a hydraulic cylinder, a linear motor, an elastic telescopic structure, a slide rail telescopic structure, a sleeve telescopic structure, etc.

[0066] The following further describes the present invention using a telescopic sleeve structure. The telescopic member 403 includes a slide bar 4031 and a sleeve 4032. The slide bar 4031 is connected to the second support rod 30 and forms an angle with the second support rod 30. The sleeve 4032 is slidably connected to the outside of the slide bar 4031 and is rotatably connected to the other end of the second connecting rod 402. The first connecting rod 401 rotates on the first branch 202, driving the second connecting rod 402 to move upward or downward. The sleeve 4032 moves on the slide bar 4031 to provide the necessary displacement compensation, thereby enabling the first support rod 20 and the second support rod 30 to be relatively unfolded or folded. The telescopic sleeve 4032 structure has the advantages of simple structure, easy manufacturing and maintenance.

[0067] The sleeve 4032 is rotatably connected to the other end of the second connecting rod 402. Figure 3 As shown, in some embodiments, a connecting portion 40321 may be protrudingly provided on the side of the sleeve 4032, and the other end of the second connecting rod 402 is rotatably connected to the connecting portion 40321. The protruding connecting portion 40321 provides an interface for rotatably connecting with the other end of the second connecting rod 402, making the installation process simpler and faster, and also facilitating subsequent maintenance and replacement. The provision of the connecting portion 40321 also increases the connection area between the sleeve 4032 and the second connecting rod 402, thereby improving the stability of the connection.

[0068] The connecting rod transmission assembly 40 is further improved to ensure that the connecting rod transmission assembly 40 has higher precision and stability during movement. Figure 2 and Figure 3 As shown, in some embodiments, the connecting rod transmission assembly 40 may further include a guide rod 404, which is rotatably connected to the movable end of the telescopic member 403. The first branch 202 is provided with a first guide groove 2021 along its extension direction; when the second branch 203 and the second support rod 30 rotate relative to each other, the guide rod 404 moves within the first guide groove 2021. During the relative expansion or folding of the first support rod 20 and the second support rod 30, the movement of the guide rod 404 within the first guide groove 2021 guides the movable ends of the second connecting rod 402 and the telescopic member 403 to move along a predetermined trajectory, limiting the range of movement of the second connecting rod 402 and the telescopic member 403, ensuring that the connecting rod transmission assembly 40 does not exceed the predetermined limit during movement, thereby enabling the first support rod 20 and the second support rod 30 to form a more stable geometric structure when they are relatively expanded or folded.

[0069] The connecting rod transmission assembly 40 is further improved to ensure that the connecting rod transmission assembly 40 has higher precision and stability during movement. Figures 1 to 3As shown, in some embodiments, the first branch 202 is provided with a second guide groove 2022 corresponding to the rotation trajectory of the first connecting rod 401, and the first connecting rod 401 is provided with a limiting protrusion (not shown) corresponding to the second guide groove 2022; when the second branch 203 and the second support rod 30 rotate relative to each other, the limiting protrusion moves within the second guide groove 2022. During the relative expansion or folding of the first support rod 20 and the second support rod 30, the movement of the limiting protrusion within the second guide groove 2022 ensures that the connecting rod transmission assembly 40 moves along a predetermined path, thereby ensuring that the connecting rod transmission assembly 40 is more stable during movement. The second guide groove 2022 is provided corresponding to the rotation trajectory of the first connecting rod 401, that is, the second guide groove 2022 is arc-shaped. In some embodiments, the second guide groove 2022 does not pass through both sides of the first branch 202; that is, on the first branch 202, according to the rotation trajectory of the first connecting rod 401 and the shape of the limiting protrusion, the second guide groove 2022 that does not pass through both sides of the first branch 202 is precisely machined; during the relative expansion or folding of the first support rod 20 and the second support rod 30, the movement of the limiting protrusion within the second guide groove 2022 can accurately limit the rotation range of the first connecting rod 401, ensuring that the connecting rod transmission assembly 40 moves along the predetermined path, thereby ensuring that the connecting rod transmission assembly 40 does not exceed the predetermined limit during movement. Figure 2 and Figure 3 As shown, in some embodiments, the second guide groove 2022 runs through both sides of the first branch 202; that is, on the first branch 202, according to the rotation trajectory of the first connecting rod 401 and the shape of the limiting protrusion, the second guide groove 2022 running through both sides is precisely processed; during the relative expansion or folding of the first support rod 20 and the second support rod 30, the limiting protrusion can move outside the two ends of the second guide groove 2022 (on both sides of the first branch 202), thereby increasing the flexibility of the connecting rod transmission assembly 40 and being able to better adapt to various complex motion trajectories and angle changes.

[0070] During the relative unfolding or folding of the first support rod 20 and the second support rod 30 , the limiting protrusion moves in the second guide groove 2022 , and the relative position change between the limiting protrusion and the second guide groove determines the relative state of the first support rod 20 and the second support rod 30 . In the embodiment not shown, the end points of the second guide groove respectively define the expanded state and the folded state of the first bracket rod 20 and the second bracket rod 30, that is, during the relative expansion of the first bracket rod 20 and the second bracket rod 30, the first connecting rod 401 will drive the limiting protrusion to move along the predetermined trajectory of the second guide groove 2022. During this process, the limiting protrusion will gradually move toward one side of the first branch 202 until it reaches the end point of one end of the second guide groove 2022, and the first bracket rod 20 and the second bracket rod 30 are in the expanded state; on the contrary, during the relative folding of the first bracket rod 20 and the second bracket rod 30, the limiting protrusion will move in the second guide groove 2022 in the opposite direction of the expansion process. During this process, the limiting protrusion will gradually move toward the other end of the second guide groove 2022 until it reaches the end point of the other end of the second guide groove 2022, and the first bracket rod 20 and the second bracket rod 30 are in the relatively folded state.

[0071] See also Figures 1 to 3 As shown, in other embodiments, the middle portion of the second guide slot defines the unfolded state of the first support rod 20 and the second support rod 30, and the end points of the second guide slot define the folded state of the first support rod 20 and the second support rod 30. Specifically, as Figure 1 As shown, during the relative expansion of the first support rod 20 and the second support rod 30, the first connecting rod 401 drives the limiting protrusion to move along the predetermined trajectory of the second guide groove 2022. During this process, the limiting protrusion gradually moves toward the middle of the second guide groove 2022 until it reaches the middle of the second guide groove 2022. The first support rod 20 and the second support rod 30 are in the expanded state; see Figure 2 and Figure 3As shown, conversely, during the relative folding process of the first support rod 20 and the second support rod 30, the limiting protrusion moves within the second guide slot 2022 in a direction opposite to that during the unfolding process. During this process, the limiting protrusion gradually moves toward one end of the second guide slot 2022 until it reaches the endpoint of one end of the second guide slot 2022, at which point the first support rod 20 and the second support rod 30 are in a relatively folded state. Specifically, when the limiting protrusion rotates to the middle of the second guide slot 2022, the first support rod 20 and the second support rod 30 are in an unfolded state. When the limiting protrusion rotates to each end of the second guide slot 2022, the first support rod 20 and the second support rod 30 are folded relative to each other. In other words, when the first and second support rods are in the unfolded state, no matter which direction the limiting link is rotated, that is, no matter which end of the second guide slot the limiting protrusion moves to, the first and second support rods will fold relative to each other, thereby enhancing user flexibility.

[0072] At this time, if the first guide groove 2021 is set at the same time, that is, the first guide groove 2021 and the second guide groove 2022 can jointly guide the connecting rod transmission assembly 40 to move according to the predetermined trajectory, there is a possibility that the first guide groove 2021 and the second guide groove 2022 are connected, and when connected, the two are in a "T" shape (such as Figure 2 and Figure 3 As shown in FIG, during the relative expansion of the first bracket rod 20 and the second bracket rod 30, the first connecting rod 401 drives the limiting protrusion to move along the predetermined trajectory of the second guide groove 2022. During this process, the limiting protrusion gradually moves toward the middle of the second guide groove 2022. At the same time, the guide rod 404 gradually moves toward the bottom of the first guide groove 2021 in the first guide groove 2021 until the limiting protrusion reaches the middle of the second guide groove 2022 and the guide rod 404 reaches the bottom of the first guide groove 2021. The first bracket rod 20 and the second bracket rod 30 are in the expanded state. On the contrary, the first bracket rod 20 and the second bracket rod 30 are folded relative to each other. During the folding process, the limiting protrusion will move in the second guide groove 2022 in the opposite direction to the unfolding process. During this process, the limiting protrusion will gradually move toward one end of the second guide groove 2022. At the same time, the guide rod 404 gradually moves in the first guide groove 2021 toward the top of the first guide groove 2021 until it reaches the end point of one end of the second guide groove 2022 and the guide rod 404 reaches the top of the first guide groove 2021. The first bracket rod 20 and the second bracket rod 30 are in a relatively folded state, and the limiting protrusion and the guide rod 404 do not interfere with each other in the moving trajectories connecting the first guide groove 2021 and the second guide groove 2022.

[0073] One end of the first connecting rod 401 is rotatably connected to the first branch 202. Specifically, when one end of the first connecting rod 401 rotates around the first branch 202 and the rotation center of the base support rod 10, Figures 1 to 3 As shown, the middle portion of the first connecting rod 401 can be rotatably connected to the rotation center of the first branch 202 and the base bracket, so that the first connecting rod 401 rotates around the rotation center of the first branch 202 and the base bracket.

[0074] See also Figure 4-Figure 6 As shown, the present invention also provides a foldable child stroller, which includes a stroller frame, a front wheel assembly 50 and a rear wheel assembly 60; the stroller frame includes two folding and rotating mechanisms on the left and right sides, and the folding and rotating mechanisms are the folding and rotating mechanisms mentioned above; the front wheel assembly 50 is arranged at the bottom of the second support rod 30; the rear wheel assembly 60 is arranged at the bottom of the first support rod 20.

[0075] In the two folding and rotating mechanisms on the left and right sides, the two second support rods 30 on the left and right sides are part of the front support of the stroller frame, the two first support rods 20 on the left and right sides are part of the rear support of the stroller frame, and the two base support rods 10 on the left and right sides and the crossbar connecting the two base support rods 10 constitute the push rod frame of the stroller frame. When the two folding and rotating mechanisms are unfolded, that is, when the front support and the rear support are unfolded, the child stroller is unfolded as shown in FIG. Figure 4 When the two folding rotating mechanism of the first support rod 20 and the second support rod 30 are folded, that is, the front support and the rear support are folded, the child stroller is folded as shown Figure 5 When the two folding rotating mechanism of the base support rod 10, the first support rod 20 and the second support rod 30 are folded, that is, the front support and the rear support are folded, the push rod frame is folded toward the rear support, and the child stroller is folded as shown Figure 6 shown.

[0076] In the child stroller, the folding and rotating mechanism is utilized to form two relatively independent rotating connection structures by rotating the front support and the rear support, and by rotating the push rod frame and the rear support, which are dispersed to two relatively independent positions, thereby reducing interference between them and avoiding the complexity of highly concentrated functional components in the concentric rotation design of the front support, the rear support, and the push rod frame. This simplifies the overall structure, reduces the difficulty and cost of manufacturing and maintenance, and improves production efficiency. At the same time, it also avoids excessive concentration of all functional components (functional components related to folding, such as the folding locking device, the universal wheel locking linkage device, etc.) on one side, thereby improving the balance and stability of the child stroller. In addition, the folding and rotating mechanism greatly reduces the size of the child stroller, making it easier to store and carry.

[0077] The folding and rotating mechanism can be used not only in child strollers, but also in other scenarios with similar needs, such as wheelchairs, foldable shopping bags, foldable shopping carts, etc.

[0078] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A folding and rotating mechanism, characterized in that: It includes a base support rod, a first support rod, a second support rod and a connecting rod transmission assembly; the first support rod includes a main body and a first branch and a second branch extending from the upper end of the main body respectively; the first branch is rotatably connected to the base support rod; the second branch is rotatably connected to the second support rod so that the first support rod and the second support rod can be relatively unfolded or folded; one end of the connecting rod transmission assembly is rotatably connected to the first branch, and the other end is connected to the second support rod.

2. The folding and rotating mechanism according to claim 1, characterized in that: One end of the connecting rod transmission assembly rotates around the first branch and the rotation center of the base support rod.

3. The folding and rotating mechanism according to claim 1, characterized in that: The other end of the connecting rod transmission assembly is connected to the rotation connection between the second bracket rod and the second branch.

4. The folding and rotating mechanism according to claim 1, wherein: The first branch and the second branch respectively extend outwardly from the upper end portion of the main body of the first bracket rod, and the first branch and the second branch are relatively far apart.

5. The folding and rotating mechanism according to claim 1, characterized in that: The connecting rod transmission assembly includes a first connecting rod, a second connecting rod and a telescopic member; one end of the first connecting rod is rotatably connected to the first branch, and the other end is connected to one end of the second connecting rod; the other end of the second connecting rod is rotatably connected to the movable end of the telescopic member; the fixed end of the telescopic member is connected to the second support rod and forms an angle with the second support rod.

6. The folding and rotating mechanism according to claim 5, characterized in that: The telescopic member includes a sliding rod and a sleeve. The sliding rod is connected to the second bracket rod and forms an angle with the second bracket rod. The sleeve is slidably connected to the outside of the sliding rod and is rotatably connected to the other end of the second connecting rod.

7. The folding and rotating mechanism according to claim 5, characterized in that: The connecting rod transmission assembly also includes a guide rod, which is rotatably connected to the movable end of the telescopic member. The first branch is provided with a first guide groove along its extension direction; when the second branch and the second bracket rod rotate relative to each other, the guide rod moves in the first guide groove.

8. The folding and rotating mechanism according to claim 7, characterized in that: The first branch is provided with a second guide groove corresponding to the rotation track of the first connecting rod, and the first connecting rod is provided with a limiting protrusion corresponding to the second guide groove; when the second branch and the second bracket rod rotate relative to each other, the limiting protrusion moves in the second guide groove.

9. The folding and rotating mechanism according to claim 8, characterized in that: The second guide groove passes through both sides of the first branch.

10. The folding and rotating mechanism according to claim 9, characterized in that: When the limiting protrusion rotates to the middle of the second guide groove, the first support rod and the second support rod are in an unfolded state; when the limiting protrusion rotates to both ends of the second guide groove respectively, the first support rod and the second support rod are relatively folded.

11. The folding and rotating mechanism according to claim 9, characterized in that: The first guide groove is communicated with the second guide groove.

12. A foldable baby stroller, characterized in that: It includes a cart frame, a front wheel assembly and a rear wheel assembly; the cart frame includes two folding and rotating mechanisms on the left and right sides, and the folding and rotating mechanisms are the folding and rotating mechanisms described in any one of claims 1-11; the front wheel assembly is arranged at the bottom of the second bracket rod; the rear wheel assembly is arranged at the bottom of the first bracket rod.

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