Cart folding and locking structure
By connecting the upper push rod, lower push rod, front bracket, and rear bracket through a linkage mechanism, the upper push rod and lower push rod can be automatically locked and unlocked, solving the cumbersome problem of individual locking in the existing technology and improving the efficiency of trolley storage and user experience.
Patent Information
- Application Number
- CN202520583237.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-31
AI Technical Summary
In existing trolley designs, the upper and lower push rods need to be locked separately when folding, which is cumbersome, increases folding and unfolding time, and reduces user experience.
The upper push rod, lower push rod, front bracket and rear bracket are connected by a linkage mechanism. The linkage mechanism realizes the automatic locking and unlocking of the upper push rod and lower push rod, simplifying the locking process.
Shorten storage time, improve user experience, simplify locking and unlocking process, and enhance user convenience.
Smart Images
Figure CN223821716U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a trolley technical field, concretely relates to a trolley folding locking structure. BACKGROUND
[0002] In daily life and various scenes, trolleys are widely used as a convenient tool. Common trolley frames are mainly composed of front supports, rear frames, upper push rods and lower push rods. The front supports are located at the front end of the trolley and play a key role in supporting the front weight and providing a mounting base for the front wheel steering mechanism, while the rear frames are responsible for carrying most of the weight of the rear part of the trolley and providing a mounting position for the rear wheels, both of which maintain the overall balance and stability of the trolley.
[0003] The upper push rod and the lower push rod are conventional structures in the trolley structure. In actual use, when the trolley needs to be stored, the upper push rod and the lower push rod need to be rotated to adjust to the appropriate position to reduce the overall space occupied by the trolley.
[0004] In current trolley designs, if the upper push rod and the lower push rod need to be fixed after storage operation, they usually need to be locked separately or simultaneously. Since the locking step is a separate operation step, it not only consumes time, but also the process is complicated. In actual use scenarios, users may need to frequently store and unfold the trolley, and the separate locking step will increase the time of storing and unfolding the trolley, reducing the user experience.
[0005] Therefore, how to solve the above-mentioned problems existing in the prior art has become the research and solution of the utility model. UTILITY MODEL CONTENT
[0006] The utility model aims to provide a trolley folding locking structure.
[0007] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:
[0008] A trolley folding locking structure, comprising an upper push rod, a lower push rod, a front support and a rear support which are rotatably arranged with each other;
[0009] The lower push rod has a first end and a second end along its extension direction; the upper push rod is close to the first end; the front support and the rear support are close to the second end;
[0010] The trolley folding locking structure further comprises a locking assembly, and the locking assembly comprises:
[0011] A docking piece is provided on the upper push rod;
[0012] A docking part is movably provided beside the lower push rod corresponding to the docking piece;
[0013] A linkage mechanism, one end of which is connected to at least one of the front support and the rear support, and the other end of which is connected to the docking portion, as a mechanism for facilitating the docking and separation of the docking piece and the docking portion.
[0014] In the above solution, in order to reduce the occupied space in the non-use stage, the upper push rod, the lower push rod, the front support and the rear support are rotated to realize folding storage. The linkage mechanism is connected to the front support. After rotating the upper push rod and the lower push rod, the front support is rotated. During this period, the linkage mechanism is driven by the front support to move the docking portion relative to the lower push rod to dock with the docking piece. After docking, the upper push rod and the lower push rod are locked with each other. The step of separately locking the upper push rod and the lower push rod is omitted, the storage time is shortened, and the use experience is improved.
[0015] In the process of resetting the front support, the linkage mechanism is driven by the front support to separate the docking portion and the docking piece, realizing automatic unlocking, omitting the step of separate unlocking, and further improving the use experience.
[0016] Further technical solutions, the stroller folding and locking structure has a locking state and an unlocking state:
[0017] In the locking state, at least one of the front support and the rear support promotes the docking portion and the docking piece to dock through the linkage mechanism, so as to limit the relative movement range of the upper push rod and the lower push rod;
[0018] In the unlocking state, at least one of the front support and the rear support promotes the docking portion and the docking piece to separate through the linkage mechanism, so as to expand the relative movement range of the upper push rod and the lower push rod.
[0019] This part supplements the specific process of locking and unlocking the upper push rod and the lower push rod. The linkage mechanism realizes the linkage of the front support or the rear support and the docking portion, avoids the need to separately operate the docking portion, and reduces the time required for storing the present application.
[0020] Further technical solutions, the upper push rod is provided with a groove, and the groove constitutes at least part of the docking piece;
[0021] The docking portion includes an insertion plate corresponding to the groove.
[0022] This part proposes a specific implementation mode of locking the upper push rod and the lower push rod. This mode realizes efficient locking, which is simple and fast.
[0023] Further technical solutions, the groove is provided in a plurality of forms; each groove is distributed in a circle.
[0024] The multiple groove structure allows for multi-position locking, and the distance or angle (such as the angle along the length) between the upper and lower push rods after locking can be adjusted to meet more needs.
[0025] In a further technical solution, a portion of the surface of the insert plate is provided with protrusions to form a protrusion structure corresponding to the groove.
[0026] This section is more suitable for cases with smaller groove sizes.
[0027] The insert plate is divided into a connecting part and a raised part. Compared with the raised part, the connecting part is larger and easier to connect with the elastic element or connector below. The smaller raised part is adapted to the size of the groove. The smaller groove can reduce the degree of modification to the upper push rod and also make it easier to set more grooves on the upper push rod.
[0028] In a further technical solution, the linkage mechanism includes a rotating disk, a protrusion, and a connecting member;
[0029] The rotating disk is rotatably mounted on the lower push rod; the rotating disk is provided with a docking hole corresponding to the protrusion;
[0030] The protrusion is connected to at least one of the front bracket and the rear bracket;
[0031] The two ends of the connector are respectively connected to the rotating disk and the docking part.
[0032] This section describes the protrusions connecting to the front bracket.
[0033] When the front bracket rotates, it drives the protrusion to rotate. Since the protrusion engages with the docking hole, the protrusion drives the rotating disk to rotate. The rotating disk drives the connecting piece to move, and the connecting piece drives the docking part to move, thus realizing the docking and separation of the docking part and the docking piece.
[0034] The structures in this section work together to stably link the front support and the docking part. The structure is simple, efficient, and occupies little space.
[0035] In a further technical solution, the linkage mechanism also includes an elastic element, one end of which acts on the lower push rod and the other end of which acts on the docking portion.
[0036] This section applies to situations where the connector is a flexible structure, such as a steel wire rope.
[0037] When an elastic element is used, the working principle of the above-mentioned linkage mechanism can be changed: before locking, the connecting part is in a taut state and the elastic element is in a compressed state. When the current bracket rotates, it causes the rotating disk to rotate through the protrusion. At this time, the connecting part gradually relaxes. Under the action of gravity and the elastic element, the docking part moves down and docks with the docking part; during the reset process, the connecting part pulls the docking part to squeeze the elastic element.
[0038] In a further technical solution, the lower push rod is provided with a first groove and a second groove that are connected to each other;
[0039] The first groove is at least used to accommodate the rotating disk;
[0040] The second groove is at least used to accommodate the connector.
[0041] The arrangement of the first and second grooves transforms the rotating disk and connecting parts from an exposed structure to an internal structure, protecting both while improving the aesthetics of this application and facilitating its structural layout.
[0042] In a further technical solution, the rotating disk can move relative to the lower push rod along its own axis;
[0043] The opening of the first groove is provided with a pressure cap for restricting the rotation of the rotating disk along its own axial direction.
[0044] In this section, the rotating disk can be separated from the lower push rod, making it easy to replace the rotating disk.
[0045] The pressure cap design ensures that the rotating disk can only rotate around its own axis during operation, preventing it from separating from the protrusion due to the rotating disk moving along its own axis, thus ensuring the stable operation of the aforementioned processes such as driving the docking part.
[0046] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.
[0047] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.
[0048] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.
[0049] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.
[0050] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.
[0051] The working principle and advantages of this utility model are as follows: To reduce space occupation during non-use periods, the upper push rod, lower push rod, front bracket, and rear bracket are rotated to achieve folding and storage. A linkage mechanism connected to the front bracket is used for explanation. Rotating the upper and lower push rods rotates the front bracket. During this process, the linkage mechanism is driven by the front bracket, causing the docking part to move relative to the lower push rod to mate with the docking component. After docking, the upper and lower push rods lock together, eliminating the need for separate locking of the upper and lower push rods, shortening storage time, and improving the user experience. During the resetting of the front bracket, the linkage mechanism is driven by the front bracket, causing the docking part to separate from the docking component, achieving automatic unlocking, eliminating the need for separate unlocking, and further improving the user experience. Attached Figure Description
[0052] Figure 1 This is a schematic diagram of the folding and locking structure of the trolley according to an embodiment of the present invention;
[0053] Figure 2 This is one of the exploded views of a partial structure of the folding and locking structure of the trolley according to an embodiment of this utility model;
[0054] Figure 3 This is the second exploded view of a partial structure of the folding and locking structure of the trolley in this embodiment of the present invention;
[0055] Figure 4 This is a schematic diagram of the push rod structure in an embodiment of the present invention;
[0056] Figure 5 This is a structural diagram of the front support, rear support, and their surrounding structures in an embodiment of the present invention.
[0057] In the above attached figures: 1. Upper push rod; 11. Groove; 2. Lower push rod; 21. First end; 22. Second end; 23. First groove; 24. Second groove; 3. Front bracket; 4. Rear bracket; 51. Connecting piece; 52. Connecting part; 521. Insert plate; 5211. Protruding structure; 53. Linkage mechanism; 531. Rotating disk; 5311. Connecting hole; 532. Protruding part; 533. Connecting part; 534. Elastic part; 6. Pressure cap. Detailed Implementation
[0058] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0059] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.
[0060] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.
[0061] See Figures 1-5 A folding and locking structure for a trolley includes an upper push rod 1, a lower push rod 2, a front bracket 3, and a rear bracket 4 that are rotatably arranged with each other.
[0062] The lower push rod 2 has a first end 21 and a second end 22 along its own extension direction; the upper push rod 1 is close to the first end 21; the front bracket 3 and the rear bracket 4 are close to the second end 22;
[0063] The folding and locking structure of the trolley further includes a locking component, which includes:
[0064] The docking component 51 is disposed on the upper push rod 1;
[0065] The docking part 52 is movably disposed beside the lower push rod 2, corresponding to the docking part 51;
[0066] The linkage mechanism 53 is connected at one end to at least one of the front support 3 and the rear support 4, and at the other end to the docking part 52, serving as a mechanism for causing the docking member 51 and the docking part 52 to dock and separate.
[0067] This application can be used in the field of children's vehicles.
[0068] To minimize space occupation during non-use periods, the upper push rod 1, lower push rod 2, front bracket 3, and rear bracket 4 are rotated to achieve folding and storage. The linkage mechanism 53 is connected to the front bracket 3 for explanation. After rotating the upper push rod 1 and lower push rod 2, the front bracket 3 is rotated. During this process, the linkage mechanism 53 is driven by the front bracket 3, causing the docking part 52 to move relative to the lower push rod 2 to dock with the docking part 51. After docking, the upper push rod 1 and lower push rod 2 are locked together. The step of separately locking the upper push rod 1 and lower push rod 2 is omitted, which shortens the storage time and improves the user experience.
[0069] During the process of resetting the front bracket 3, the linkage mechanism 53 is driven by the front bracket 3 to cause the docking part 52 to separate from the docking piece 51, thereby achieving automatic unlocking and eliminating the need for separate unlocking steps, further improving the user experience.
[0070] The front bracket 3 and the rear bracket 4 are equipped with casters. The locking targets of this application are the upper push rod 1 and the lower push rod 2, which are prone to relative movement.
[0071] It should be noted that the upper push rod 1, lower push rod 2, front bracket 3, and rear bracket 4 are the components of the stroller frame. The structure itself is an existing design and is known to those skilled in the art. The connection between them is a conventional design. For example, both the front bracket 3 and the rear bracket 4 can be rotatably connected to the lower push rod 2. The specific implementation method is an existing design, such as through a pivot. These details are known to those skilled in the art and will not be elaborated in this application. For reference, you can refer to the relevant designs in existing children's strollers.
[0072] It should be emphasized that the number of the above structures can be adjusted according to the actual situation. For example, the docking part 51, the docking section 52, and the linkage mechanism 53 can all be set to two. The two linkage mechanisms 53 can both be connected to the front bracket 3, or both can be connected to the rear bracket 4, or they can be connected to the front bracket 3 and the rear bracket 4 one to one. Based on this, it should also be noted that the docking part 51 can include two of the following grooves 11, and the linkage mechanism 53 can be set to two in all the structures included below, or the linkage mechanism 53 can include two substructures in all the structures included below (such as the connector 533 including two connecting sub-parts). For ease of understanding, these structures are described as a single one in this application unless otherwise emphasized, and can be adjusted according to the actual situation.
[0073] Two points need to be emphasized here: First, the front support 3 is used as an example, and the rear support 4 and other structures are described in the same way. The front support 3 should not be considered as a structure with only a single support. It may include structures such as the rollers shown in the attached drawings. The front support 3 can be understood as a front support assembly. Second, the innovation of this application is to achieve rapid locking and unlocking through structural linkage, omitting the separate locking and unlocking steps. The objects targeted for locking and unlocking are the upper push rod 1 and the lower push rod 2. Locking of structures such as the front support 3 is not considered, nor is locking of structures such as the upper push rod 1 during the unfolding stage.
[0074] In this embodiment, the trolley folding locking structure has a locked state and an unlocked state:
[0075] See Figure 1 In the locked state, at least one of the front bracket 3 and the rear bracket 4 causes the docking part 52 to dock with the docking piece 51 through the linkage mechanism 53, so as to limit the relative movement range of the upper push rod 1 and the lower push rod 2.
[0076] In the unlocked state, at least one of the front bracket 3 and the rear bracket 4 causes the docking part 52 to separate from the docking member 51 through the linkage mechanism 53, so as to expand the relative movement range of the upper push rod 1 and the lower push rod 2.
[0077] In some embodiments, the groove 11 and the insert plate 521 are described below. The groove 11 and the insert plate 521 are sized to fit each other. In the locked state, the upper push rod 1 and the lower push rod 2 are fixed in relative position. In the unlocked state, the upper push rod 1 and the lower push rod 2 can move relative to each other.
[0078] In some embodiments, the groove 11 and the insert plate 521 are described below. The size of the groove 11 is larger than the size of the insert plate 521. In the locked state, the upper push rod 1 and the lower push rod 2 can move relative to each other within a small range. In the unlocked state, the upper push rod 1 and the lower push rod 2 can move within a larger range.
[0079] This embodiment supplements the specific process of locking and unlocking the upper push rod 1 and the lower push rod 2. The linkage mechanism 53 realizes the linkage between the front bracket 3 or the rear bracket 4 and the docking part 52, avoiding the need to operate the docking part 52 separately and reducing the time required to store this application.
[0080] See Figures 2-4 In this embodiment, the upper push rod 1 is provided with a groove 11, and the groove 11 constitutes at least a portion of the docking member 51;
[0081] The docking portion 52 includes an insert plate 521 corresponding to the groove 11.
[0082] In some embodiments, the groove 11 forms the mating member 51.
[0083] In some embodiments, the groove 11 is disposed at the end of the upper push rod 1 near the lower push rod 2. This is used as an example for illustration. The positions of at least some structures in this application can be adjusted according to actual needs, and no specific limitations are made in this application.
[0084] In the locked state, the insert plate 521 is inserted into the groove 11; in the unlocked state, the insert plate 521 is separated from the groove 11.
[0085] This embodiment proposes a specific method for locking the upper push rod 1 and the lower push rod 2. This method achieves efficient locking and is simple and quick.
[0086] In this embodiment, the grooves 11 are provided in multiple ways; each groove 11 is circumferentially distributed.
[0087] In some embodiments, the end of the upper push rod 1 near the lower push rod 2 has a circular structure, and the grooves 11 are evenly distributed around this circular structure.
[0088] The multiple grooves 11 structure can achieve multi-position locking, and adjust the distance or angle (such as the angle in the length direction) between the upper push rod 1 and the lower push rod 2 after locking to meet more needs. For example, by realizing different opening angles of the upper push rod 1 and the lower push rod 2, the gripping needs of users of different heights can be met.
[0089] See Figure 2 In this embodiment, a portion of the surface of the insert plate 521 is provided with protrusions to form a protrusion structure 5211 corresponding to the groove 11.
[0090] This embodiment is more suitable for cases where the groove 11 is smaller.
[0091] The insert plate 521 is divided into a connecting part and a protruding part. Compared with the protruding part, the connecting part is larger in size and is easier to connect with the elastic element 534 or the connecting element 533 described below. The smaller protruding part is adapted to the size of the groove 11. The smaller groove 11 can reduce the degree of modification to the upper push rod 1 and also facilitate the setting of more grooves 11 on the upper push rod 1.
[0092] See Figures 1-3 In this embodiment, the linkage mechanism 53 includes a rotating disk 531, a protrusion 532, and a connecting member 533;
[0093] The rotating disk 531 is rotatably mounted on the lower push rod 2; the rotating disk 531 is provided with a docking hole 5311 corresponding to the protrusion 532;
[0094] The protrusion 532 is connected to at least one of the front bracket 3 and the rear bracket 4;
[0095] The two ends of the connector 533 are respectively connected to the rotating disk 531 and the docking part 52.
[0096] This embodiment is illustrated by showing the protrusion 532 connected to the front bracket 3.
[0097] This embodiment presents one specific form of the linkage mechanism 53. In other embodiments, the linkage mechanism 53 may take other specific forms.
[0098] In some embodiments, the mating holes 5311 and the protrusions 532 are two or more and the number is equal.
[0099] In some embodiments, the connector 533 is a rod-shaped structure.
[0100] In some embodiments, the connector 533 is elastic, such as using a carbon fiber elastic link.
[0101] In some embodiments, the protrusion 532 is configured as a boss.
[0102] When the front bracket 3 rotates, it drives the protrusion 532 to rotate. Since the protrusion 532 is engaged with the docking hole 5311, the protrusion 532 drives the rotating disk 531 to rotate. The rotating disk 531 drives the connecting piece 533 to move. The connecting piece 533 drives the docking part 52 to move, thereby realizing the docking and separation of the docking part 52 and the docking piece 51.
[0103] The structures in this embodiment cooperate with each other to stably realize the linkage between the front support 3 and the docking part 52. The structure is simple and efficient and occupies little space.
[0104] See Figures 2-3 In this embodiment, the linkage mechanism 53 further includes an elastic element 534, one end of which acts on the lower push rod 2 and the other end of which acts on the docking part 52.
[0105] In some embodiments, the elastic element 534 is configured as a spring structure, such as a compression spring.
[0106] This embodiment applies to cases where the connector 533 is a flexible structure, such as a steel wire rope.
[0107] When the elastic element 534 is used, the working principle of the aforementioned linkage mechanism 53 can be changed. The changed principle is as follows: Before locking, the connecting member 533 is in a taut state, and the elastic element 534 is in a compressed state. When the current support 3 rotates, it causes the rotating disk 531 to rotate through the protrusion 532. At this time, the connecting member 533 gradually relaxes. Under the action of gravity and the elastic element 534, the docking part 52 moves down and docks with the docking part 51. During the reset process, the connecting member 533 pulls the docking part 52 to squeeze the elastic element 534. After the change, the accuracy of the movement of the docking part 52 can be improved, and the space occupied by the connecting member 533 can also be appropriately reduced.
[0108] See Figures 1-2 In this embodiment, the lower push rod 2 is provided with a first groove 23 and a second groove 24 that are connected to each other;
[0109] The first groove 23 is at least used to accommodate the rotating disk 531;
[0110] The second groove 24 is at least used to accommodate the connector 533.
[0111] The first groove 23 can also accommodate part of the front support 3 or the rear support 4, and the second groove 24 can also accommodate the elastic element 534, without specific limitations.
[0112] The arrangement of the first groove 23 and the second groove 24 transforms the rotating disk 531 and the connector 533 from an exposed structure to an internal structure, which protects both of them, improves the aesthetics of this application, and is also beneficial to the structural layout of this application.
[0113] Regarding the second groove 24, it is added here: In some embodiments, the lower push rod 2 has a main body housing, which encloses to form the second groove 24. The second groove 24 has two openings, one of which faces the front bracket 3 and the other faces downward.
[0114] In some embodiments, the connector 533 extends from the end of the lower push rod 2 near the upper push rod 1.
[0115] See Figures 1-3 In this embodiment, the rotating disk 531 can move relative to the lower push rod 2 along its own axis;
[0116] The opening of the first groove 23 is provided with a pressure cover 6 for restricting the rotation disk 531 from moving along its own axis.
[0117] In some embodiments, the first groove 23 has a columnar structure belonging to the lower push rod 2, and the rotating disk 531 is sleeved on the outside of the columnar structure. This is used as an example for illustration. The structural connection method is conventional, including fixed connection and rotational connection. Specific implementation methods can refer to existing methods.
[0118] In this embodiment, the rotating disk 531 can be separated from the lower push rod 2, making it convenient to replace the rotating disk 531.
[0119] In some embodiments, the pressure cap 6 is threadedly connected to the lower push rod 2.
[0120] The pressure cap 6 ensures that the rotating disk 531 can only rotate around its own axis during operation, preventing the rotating disk 531 from separating from the protrusion 532 due to its own axial movement, thus ensuring the stable operation of the aforementioned processes such as driving the docking part 52.
[0121] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A folding and locking structure for a trolley, characterized in that: It includes an upper push rod (1), a lower push rod (2), a front bracket (3), and a rear bracket (4) that are rotatably arranged with each other; The lower push rod (2) has a first end (21) and a second end (22) along its own extension direction; the upper push rod (1) is close to the first end (21); the front bracket (3) and the rear bracket (4) are close to the second end (22); The folding and locking structure of the trolley further includes a locking component, which includes: A connecting piece (51) is provided on the upper push rod (1); The docking part (52) is movably disposed on the side of the lower push rod (2) corresponding to the docking part (51); The linkage mechanism (53) is connected at one end to at least one of the front support (3) and the rear support (4), and at the other end to the docking part (52), serving as a mechanism for causing the docking member (51) and the docking part (52) to dock and separate.
2. The folding and locking structure for a trolley according to claim 1, characterized in that: The folding locking structure of the trolley has a locked state and an unlocked state: In the locked state, at least one of the front bracket (3) and the rear bracket (4) causes the docking part (52) to dock with the docking piece (51) through the linkage mechanism (53) to limit the relative movement range of the upper push rod (1) and the lower push rod (2); In the unlocked state, at least one of the front bracket (3) and the rear bracket (4) causes the docking part (52) to separate from the docking piece (51) through the linkage mechanism (53) to expand the relative movement range of the upper push rod (1) and the lower push rod (2).
3. The folding and locking structure for a trolley according to claim 1, characterized in that: The upper push rod (1) is provided with a groove (11), and the groove (11) constitutes at least a portion of the docking member (51); The docking part (52) includes an insert plate (521) corresponding to the groove (11).
4. The folding and locking structure for a trolley according to claim 3, characterized in that: The grooves (11) are provided in multiple ways; each groove (11) is circumferentially distributed.
5. A folding and locking structure for a trolley according to claim 3, characterized in that: The surface of the insert (521) is partially raised to form a raised structure (5211) corresponding to the groove (11).
6. A folding and locking structure for a trolley according to any one of claims 1-5, characterized in that: The linkage mechanism (53) includes a rotating disk (531), a protrusion (532), and a connecting member (533). The rotating disk (531) is rotatably mounted on the lower push rod (2); the rotating disk (531) is provided with a docking hole (5311) corresponding to the protrusion (532). The protrusion (532) is connected to at least one of the front bracket (3) and the rear bracket (4); The two ends of the connector (533) are respectively connected to the rotating disk (531) and the docking part (52).
7. A folding and locking structure for a trolley according to claim 6, characterized in that: The linkage mechanism (53) also includes an elastic element (534), one end of which acts on the lower push rod (2) and the other end of which acts on the docking part (52).
8. A folding and locking structure for a trolley according to claim 6, characterized in that: The lower push rod (2) is provided with a first groove (23) and a second groove (24) that are connected to each other. The first groove (23) is at least used to accommodate the rotating disk (531); The second groove (24) is at least used to accommodate the connector (533).
9. A folding and locking structure for a trolley according to claim 8, characterized in that: The rotating disk (531) can move relative to the lower push rod (2) along its own axis; The opening of the first groove (23) is provided with a pressure cap (6) for restricting the rotation disk (531) from moving along its own axis.
10. A folding and locking structure for a trolley according to claim 7, characterized in that: The connector (533) is a steel wire rope; the elastic element (534) is a compression spring.