Baby carriage frame

Abstract

According to the technical scheme, a first unlocking piece is arranged between a handle pipe and a first locking assembly, meanwhile, a second unlocking piece is arranged between a handle joint base and a second locking assembly, in the folding process of the frame, the first unlocking piece acts on the first locking assembly, a handle set is unlocked, and the handle set is locked. The rotating handlebar joint seat drives the second unlocking piece, the second unlocking piece acts on the second locking assembly to unlock the supporting foot stand, and then the whole bicycle is folded, the number of parts assembled is small, the failure rate and the production difficulty of the bicycle frame are reduced, and the bicycle has the advantages of being low in maintenance cost and production cost.

Description

Technical Field

[0001] This utility model relates to the field of infant and child product technology, and in particular to a stroller frame. Background Technology

[0002] As an essential tool for infants and toddlers' travel, the lightweight, convenience, and safety of strollers have become core directions for industry development. In recent years, the market demand for foldable strollers has continued to grow due to their ease of carrying and storage. The folding design of the frame directly affects the product's operational convenience and structural reliability, while the complexity of the internal rotating structure of the frame directly determines the overall folding performance, production cost, and failure rate. Currently, optimizing the folding mechanism to reduce the number of parts, improve assembly efficiency, and lower maintenance costs has become a key area for technological improvement in the industry.

[0003] Current stroller frames generally employ a handlebar-linked support leg unlocking design for their folding mechanisms. Specifically, the user folds the handlebar downwards, triggering the transmission mechanism and releasing the locking between the front and rear leg tubes, ultimately folding the stroller. This design typically requires multiple transmission components within the rotating joint, with each component needing precise coordination to transmit force and switch between locked states. However, the complex transmission structure of existing technology relies on the coordinated action of multiple components, making it susceptible to malfunction during long-term use due to the failure of a single component (e.g., fatigue, wear, deformation), leading to abnormal folding function, increased maintenance costs, and safety hazards. Furthermore, the multi-part design requires separate molds and additional assembly processes, raising manufacturing costs and extending production cycles due to high assembly precision requirements, thus impacting product market competitiveness. Therefore, existing stroller frames suffer from high maintenance and production costs. Utility Model Content

[0004] The main purpose of this utility model is to propose a stroller frame that aims to solve the technical problems of high maintenance and production costs of existing stroller frames.

[0005] To achieve the above objectives, this utility model proposes a stroller frame, comprising:

[0006] The handlebar assembly includes a handlebar tube and a handlebar joint seat. The handlebar tube extends into the handlebar joint seat and includes an upper handlebar tube and a lower handlebar tube. The upper handlebar tube can move along the interior of the lower handlebar tube.

[0007] The support leg is rotatably connected to the handle assembly. The support leg includes a front leg tube and a rear leg tube, which are pivotally connected.

[0008] The first locking component is configured to lock the rotation of the handlebar assembly relative to the support legs when the frame is in the unfolded state. Before the frame switches from the unfolded state to the folded state, the locking of the handlebar assembly relative to the support legs is released to allow the handlebar tube to rotate relative to the support legs.

[0009] The first unlocking component is located between the handlebar tube and the first locking component. The first unlocking component is configured to transfer the force of the handlebar tube to the first locking component when the upper handlebar tube falls along the lower handlebar tube, so as to unlock the first locking component.

[0010] The second locking component is configured to lock the rotation between the front and rear leg tubes when the frame is in the unfolded state. Before the frame switches from the unfolded to the folded state, the locking of the front and rear leg tubes is released, allowing for folding rotation between them.

[0011] The second unlocking component is located between the handlebar joint seat and the second locking component. The second unlocking component is configured to transfer the rotational force of the handlebar joint seat to the second locking component when the handlebar assembly rotates relative to the support leg, so as to unlock the second locking component.

[0012] Furthermore, the first locking assembly includes a rotating member, a driving member, a first locking tooth, and a first limiting seat. The rotating member and the driving member are located between the handlebar joint seat and the first locking tooth, while the first locking tooth is located between the handlebar joint seat and the first limiting seat. The rotating member has a twisting part. The first unlocking member causes the rotating member to rotate by contacting the twisting part. When the rotating member rotates, it pushes the driving member, and the first locking tooth disengages from the handlebar joint seat through the action of the driving member, thereby releasing the rotation of the handlebar assembly relative to the support leg.

[0013] Furthermore, the rotating component is provided with a first guide portion, and the driving component is provided with a second guide portion. The first guide portion abuts against the second guide portion. When the rotating component rotates, the first guide portion pushes the second guide portion, causing the driving component to move toward the direction of the first locking tooth.

[0014] Furthermore, the first guide portion includes a first guide ramp and a first guide plane, and correspondingly, the second guide portion includes a second guide ramp and a second guide plane. When the rotating member rotates, a sliding motion is formed between the first guide ramp and the second guide ramp, causing the driving member to move away from the rotating member. After the first guide plane contacts the second guide plane, the moving away motion of the driving member stops.

[0015] Furthermore, the drive component also includes a guide rail, a first guide plane extending into the guide rail, and a second guide portion disposed within the path of the guide rail.

[0016] Furthermore, a first reset component is provided between the first locking tooth and the first limiting seat for resetting the position of the first locking tooth, so that the first locking tooth abuts against the handle joint seat and the first limiting seat.

[0017] Furthermore, the second locking component includes a second locking tooth and a second limiting seat. The second locking tooth is disposed between the first limiting seat and the second limiting seat. The handle joint seat is provided with a third guide portion. The third guide portion abuts against the second unlocking member. When the handle joint seat rotates, the third guide portion pushes the second unlocking member, and the second unlocking member moves toward the direction of the second locking tooth. At the same time, the second unlocking member disengages from the first limiting seat.

[0018] Furthermore, the third guide portion includes a third guide ramp and a third guide plane. Correspondingly, the end of the second unlocking member facing the third guide portion is provided with a fourth guide portion, which includes a fourth guide ramp and a fourth guide plane. When the handle joint seat rotates, a sliding motion is formed between the third guide ramp and the fourth guide ramp, causing the second unlocking member to move away from the handle joint seat. After the third guide plane and the fourth guide plane come into contact, the moving away motion of the second unlocking member stops.

[0019] Furthermore, the end of the second unlocking member facing the second locking tooth is provided with a drive post, which abuts against the second locking tooth.

[0020] Furthermore, a second reset component is provided between the second locking tooth and the second limiting seat for resetting the position of the second locking tooth, so that the second locking tooth abuts against the first limiting seat and the second limiting seat.

[0021] This utility model provides a first unlocking component between the handlebar tube and the first locking assembly, and a second unlocking component between the handlebar joint seat and the second locking assembly. During the folding process of the frame, the first unlocking component acts on the first locking assembly to unlock the handlebar assembly. The rotating handlebar joint seat drives the second unlocking component, which then acts on the second locking assembly to unlock the support legs, thereby achieving full folding of the vehicle. This utility model has fewer parts, reducing the failure rate and production difficulty of the frame. This utility model has the beneficial effects of lower maintenance and production costs. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is an exploded three-dimensional structural view of the present invention;

[0024] Figure 3 Analyzing the three-dimensional structure of the handle joint seat, the first locking component, the first unlocking component, the second locking component, and the second unlocking component. Figure 1 ;

[0025] Figure 4Analyzing the three-dimensional structure of the handle joint seat, the first locking component, the first unlocking component, the second locking component, and the second unlocking component. Figure 2 ;

[0026] Figure 5 A three-dimensional structural diagram of the first unlocking component and the rotating component;

[0027] Figure 6 This is a schematic diagram of the planar structure of the rotating component and the driving component;

[0028] Figure 7 A three-dimensional structural diagram of the rotating and driving components;

[0029] Figure 8 A three-dimensional structural diagram of the handle joint seat and the second unlocking component;

[0030] Figure 9 This is a three-dimensional structural diagram of the first unlocking component and the third reset component.

[0031] The above figures include the following reference numerals:

[0032] 1. Handle assembly; 11. Handle tube; 111. Upper handle tube; 112. Lower handle tube; 12. Handle joint seat; 121. Third guide part; 1211. Third guide ramp; 1212. Third guide plane; 122. Seat cavity; 2. Support leg; 21. Front leg tube; 22. Rear leg tube; 3. First locking assembly; 31. Rotating component; 311. Torsion part; 312. First guide part; 3121. First guide ramp; 3122. First guide plane; 32. Drive component; 321. Second guide Part; 3211, Second guide slope; 3212, Second guide plane; 322, Guide rail; 33, First locking tooth; 34, First limiting seat; 35, First reset component; 4, First unlocking component; 41, Transmission part; 42, Mounting part; 5, Second locking assembly; 51, Second locking tooth; 52, Second limiting seat; 53, Second reset component; 6, Second unlocking component; 61, Fourth guide part; 611, Fourth guide slope; 612, Fourth guide plane; 62, Drive column; 7, Third reset component. Detailed Implementation

[0033] The technical solutions of the embodiments of this utility model 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 utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0034] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is 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 indication will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are 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, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0036] This utility model proposes a stroller frame.

[0037] In this embodiment of the utility model, such as Figures 1 to 9As shown, the stroller frame includes a handlebar assembly 1 and a support leg 2. A first locking component 3, a first unlocking component 4, a second locking component 5, and a second unlocking component 6 are provided between the handlebar assembly 1 and the support leg 2. The first locking component 3 and the first unlocking component 4 are used to control the rotation of the handlebar assembly 1, while the second locking component 5 and the second unlocking component 6 are used to control the rotation of the support leg 2. Specifically, the handlebar assembly 1 includes a handlebar tube 11 and a handlebar joint seat 12. The handlebar tube 11 extends into the handlebar joint seat 12. The handlebar tube 11 includes an upper handlebar tube 111 and a lower handlebar tube 112. The upper handlebar tube 111 can move along the interior of the lower handlebar tube 112. The support leg 2 is rotatably connected to the handlebar assembly 1. The support leg 2 includes a front leg tube 21 and a rear leg tube 22, which are pivotally connected. The first locking component 3 is configured to lock the rotation of the handlebar assembly 1 relative to the support leg 2 when the frame is in the unfolded state. Before the frame switches from the unfolded state to the folded state, the locking state of the handlebar assembly 1 relative to the support leg 2 is released to allow the handlebar tube 11 to rotate relative to the support leg 2. Correspondingly, the first unlocking component 4 is provided on the handlebar tube 11 and the first locking component 3. Between them, the first unlocking member 4 is configured to transmit the force of the handlebar upper tube 111 to the first locking component 3 when the handlebar upper tube 111 falls along the handlebar lower tube 112, so as to unlock the first locking component 3. The second locking component 5 is configured to lock the rotation between the front leg tube 21 and the rear leg tube 22 when the frame is in the unfolded state. Before the frame switches from the unfolded state to the folded state, the locking of the front leg tube 21 and the rear leg tube 22 is released, so as to realize the folding rotation between the front leg tube 21 and the rear leg tube 22. Correspondingly, the second unlocking member 6 is disposed between the handlebar joint seat 12 and the second locking component 5. The second unlocking member 6 is configured to transmit the rotational force of the handlebar joint seat 12 to the second locking component 5 when the handlebar assembly 1 rotates relative to the support leg 2, so as to unlock the second locking component 5.

[0038] In some embodiments of this utility model, the first locking component 3 includes a rotating member 31, a driving member 32, a first locking tooth 33, and a first limiting seat 34. The rotating member 31 and the driving member 32 are located between the handle joint seat 12 and the first locking tooth 33, while the first locking tooth 33 is located between the handle joint seat 12 and the first limiting seat 34. The function of the rotating member 31 and the driving member 32 is to disengage the first locking tooth 33 from the handle joint seat 12, thereby releasing the limiting of the handle joint seat 12. The rotating member 31 is provided with a twisting part 311. The first unlocking member 4 causes the rotating member 31 to rotate by contacting the twisting part 311. When the rotating member 31 rotates, the rotating member 31 pushes the driving member 32, and the first locking tooth 33 disengages from the handle joint seat 12 by the action of the driving member 32, thereby releasing the rotation of the handle assembly 1 relative to the support leg 2.

[0039] Specifically, the twisting part 311 is constructed as a cylinder protruding from the end face of the rotating member 31. When the first unlocking member 4 collides with the twisting part 311, it drives the twisting part 311 to move in the direction of the impact force, and the rotating member 31 rotates accordingly. In some preferred embodiments of the present invention, the twisting part 311 is defined as a cylinder. Compared with other shapes, the cylinder is easier to be hit when the first unlocking member 4 impacts, and the cylinder suffers less wear during the impact.

[0040] In some embodiments of this utility model, in order to effectively push the driving member 32 horizontally after the rotating member 31 rotates, the rotating member 31 is provided with a first guide portion 312, and the driving member 32 is provided with a second guide portion 321. The first guide portion 312 abuts against the second guide portion 321. When the rotating member 31 rotates, the first guide portion 312 pushes the second guide portion 321, causing the driving member 32 to move toward the direction of the first locking tooth 33.

[0041] Specifically, the first guide portion 312 includes a first guide slope 3121 and a first guide plane 3122. Correspondingly, the second guide portion 321 includes a second guide slope 3211 and a second guide plane 3212. When the rotating member 31 rotates, a sliding motion is formed between the first guide slope 3121 and the second guide slope 3211, causing the driving member 32 to move away from the rotating member 31. After the first guide plane 3122 contacts the second guide plane 3212, the moving away motion of the driving member 32 stops.

[0042] More specifically, multiple first guide portions 312 and second guide portions 321 are respectively provided on the end faces of the rotating member 31 and the driving member 32. The specific arrangement of the first guide portions 312 and second guide portions 321 is to surround the rotating member 31 or the driving member 32 in a circle. Taking the first guide portion 312 as an example, when there are two, the two first guide portions 312 are respectively located on opposite sides; when there are three, the three first guide portions 312 surround the center of the rotating member 31 and are evenly spaced. Please refer to [example missing]. Figures 3 to 7 The content shown, Figures 3 to 7 The content describes the case when the first guide part 312 and the second guide part 321 are set to three. Compared with setting more first guide parts 312 and second guide parts 321, setting three can save mold costs while achieving stable rotation and pushing action. That is, the cost is lower under the condition of the same effect.

[0043] Specifically, when the first guide portion 312 contacts the second guide portion 321 and rotates, the rotational connection may not be tight, thus affecting the pushing effect of the drive member 32. To solve the problem of rotational stability between the rotating member 31 and the drive member 32, the drive member 32 also includes a guide rail 322. The first guide plane 3122 extends into the guide rail 322, and the second guide portion 321 is disposed within the path of the guide rail 322. When the first guide portion 312 contacts the second guide portion 321 and rotates, since the first guide portion 312 falls within the guide rail 322, a tight rotational connection is formed between the rotating member 31 and the drive member 32, thereby enhancing the rotational stability.

[0044] In some embodiments of this utility model, a first reset component 35 is provided between the first locking tooth 33 and the first limiting seat 34 for resetting the position of the first locking tooth 33, so that the first locking tooth 33 abuts against the handle joint seat 12 and the first limiting seat 34. There are two switching states of the first locking tooth 33. One is that when it abuts against the handle joint seat 12 and the first limiting seat 34, it limits the handle joint seat 12; the other is that when it is trapped in the first limiting seat 34, it releases the limitation on the handle joint seat 12. The function of the first reset component 35 is to restore the two states to one state.

[0045] Specifically, to understand the first reset component 35, the following implementation is provided for explanation: the first reset component 35 is constructed as a spring, which is disposed between the first locking tooth 33 and the first limiting seat 34. The spring can release elastic potential energy to the first locking tooth 33 to restore the first locking tooth 33 from the aforementioned two states to its original form. In some other embodiments of this utility model, the first reset component 35 can also be constructed as a component with elastic properties such as rubber, sponge, or elastic fiber. For more elastic components, please refer to the prior art section, which will not be elaborated here.

[0046] In some embodiments of this utility model, the second locking component 5 includes a second locking tooth 51 and a second limiting seat 52. The second locking tooth 51 is disposed between the first limiting seat 34 and the second limiting seat 52. The handle joint seat 12 is provided with a third guide portion 121. The third guide portion 121 abuts against the second unlocking member 6. When the handle joint seat 12 rotates, the third guide portion 121 pushes the second unlocking member 6, and the second unlocking member 6 moves toward the direction of the second locking tooth 51. At the same time, the second unlocking member 6 disengages from the first limiting seat 34.

[0047] Specifically, the third guide portion 121 includes a third guide slope 1211 and a third guide plane 1212. Correspondingly, the end of the second unlocking member 6 facing the third guide portion 121 is provided with a fourth guide portion 61. The fourth guide portion 61 includes a fourth guide slope 611 and a fourth guide plane 612. When the handle joint seat 12 rotates, a sliding motion is formed between the third guide slope 1211 and the fourth guide slope 611, causing the second unlocking member 6 to move away from the handle joint seat 12. After the third guide plane 1212 and the fourth guide plane 612 come into contact, the moving away motion of the second unlocking member 6 stops.

[0048] It is worth noting that the working principle of the third guide part 121 and the fourth guide part 61 is actually the same as that of the first guide part 312 and the second guide part 321, but there are also some differences. Since the third guide part 121 is located on the handle joint seat 12, the space occupied by the third guide part 121 is smaller. The first guide part 312 and the second guide part 321 do not have to worry about space occupation in their arrangement and can be arranged around the entire end face of the rotating member 31 and the driving member 32. In the case of occupying less space, preferably, there are two third guide parts 121 and the fourth guide part 61. At the same time, the corresponding and different third guide parts 121 and the fourth guide part 61 are arranged on opposite sides. Under this arrangement, the handle joint seat 12 and the second unlocking member 6 can form a tight connection when rotating, thereby achieving a better pushing effect on the second locking tooth 51. In addition, in order to improve the linkage effect of rotation and pushing, the inclined portion of the first guide portion 312, the second guide portion 321, the third guide portion 121 and the fourth guide portion 61 is wider than the planar portion. It can be understood that in the linkage process of rotation and pushing, the movement of the inclined surface is the main working part. The fact that the width of the inclined surface portion is greater than that of the planar portion can reduce assembly costs while better achieving the working purpose of rotation and pushing.

[0049] Specifically, in order to solve the problem of the pushing performance between the second unlocking member 6 and the second locking tooth 51, the end of the second unlocking member 6 facing the second locking tooth 51 is provided with a driving post 62. The driving post 62 abuts against the second locking tooth 51. After the second unlocking member 6 forms a push through the rotation between the third guide part 121 and the fourth guide part 61, the driving post 62 can be used to form a stronger push on the second locking tooth 51, so that the second locking tooth 51 can smoothly enter the second limiting seat 52.

[0050] Specifically, the arrangement of the drive column 62 is similar to that of the first guide portion 312 and the second guide portion 321. The drive column 62 is arranged around the end face of the second unlocking member 6. For details, refer to the arrangement of the first guide portion 312 and the second guide portion 321; further details will not be elaborated here. Figure 3 and Figure 4 as well as Figure 8As shown in the content, the drive column 62 is specifically set to three. When set to two or three, it can save mold costs while achieving a more stable pushing effect.

[0051] Specifically, regarding the accurate understanding of the second unlocking component 6, the second unlocking component 6 is divided into two parts: the fourth guide portion 61 and the drive post 62, which correspond to the rotation of the handle joint seat 12 and the pushing of the second locking tooth 51, respectively. Preferably, the fourth guide portion 61 and the drive post 62 are integrally formed on the second unlocking component 6. The advantage of integral forming is that it saves assembly costs and enhances stability. In some other embodiments, the second unlocking component 6 can be split into two separate parts, with the fourth guide portion 61 and the drive post 62 located in the separate parts.

[0052] Specifically, a second reset component 53 is provided between the second locking tooth 51 and the second limiting seat 52 for resetting the position of the second locking tooth 51 so that the second locking tooth 51 abuts against the first limiting seat 34 and the second limiting seat 52. Since the principle and function are the same, the setting of the second reset component 53 refers to the content of the first reset component 35, and will not be described again here.

[0053] In some embodiments of this utility model, in order to solve the problem of the first unlocking member 4 resetting after the driving rotating member 31, a third reset member 7 is provided in conjunction with the first unlocking member 4. The third reset member 7 is constructed as a component with elastic properties. The setting of the third reset member 7 is the same as that of the first reset member 35, and will not be described in detail here. Figure 9 As shown, the first unlocking member 4 includes a transmission part 41 that acts on the rotating member 31 and a mounting part 42 for assembling the third reset member 7. The mounting part 42 is inside the handle joint seat 12, while the transmission part 41 extends out from the inside of the handle joint seat 12 and into the seat cavity 122 of the handle joint seat 12. It can be understood that in order to limit the range of motion of the third reset member 7, the handle joint seat 12 is provided with a receiving groove (not shown) for placing the third reset member 7. The size of the receiving groove should be adapted to the third reset member 7 so that the third reset member 7 can fully release its elastic potential energy when it rebounds.

[0054] In some embodiments of this utility model, the following intuitive connection relationship of the support legs 2 is proposed: the front leg tube 21 extends into the first limiting seat 34, and the rear leg tube 22 extends into the second limiting seat 52. When the second locking tooth 51 is released, the front leg tube 21 folds towards the rear leg tube 22 to fold up the frame. In some other embodiments of this utility model, the rear leg tube 22 may extend into the second limiting seat 52 and the rear leg tube 22 may extend into the first limiting seat 34. It should be noted that the former moves the front leg tube 21 first when folding up the frame, so the former is more intuitive to use.

[0055] The following content explains the working principle of this utility model, along with some supplementary explanations:

[0056] After the upper handle tube 111 is unlocked, it falls along the lower handle tube 112. At this time, the first unlocking member 4 follows the upper handle tube 111 and abuts against it, driving the first unlocking member 4 to move. Of course, it can be understood that the first unlocking member 4 can also be directly driven by the upper handle tube 111 to generate movement. The former requires the first unlocking member 4 to be located inside the upper handle tube 111, while the latter places the upper handle tube 111 on its falling trajectory. After the first unlocking member 4 moves, it drives the twisting part 311 to cause the rotating part 31 to rotate. It can be understood that, in order to enhance the correlation between the movement of the first unlocking member 4 and the rotating part 31, the twisting part 311 and the first guide part 312 can be integrally formed. The configuration is as follows: after the rotating member 31 rotates, the driving member 32 pushes the first locking tooth 33 out of the handlebar joint seat 12 through the action of the first guide part 312 and the second guide part 321. After the handlebar joint seat 12 is unlocked, it is folded and closed. Then, the third guide part 121 and the fourth guide part 61 act to make the second unlocking member 6 push the second locking tooth 51 out of the first limiting seat 34. After the first limiting seat 34 is unlocked, it is folded and closed. It can be understood that as the basic parts of the stroller, the seat part and the footrest part will fold and close with the folding and closing of the handlebar joint seat 12, and the support frame 2 part will fold and close with the folding and closing of the first limiting seat 34, thereby completing the folding of the entire frame. When lifting and storing, the rear rod of the seat part is grabbed and moved.

[0057] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A stroller frame, characterized by, The utility model relates to a folding bicycle, comprising: a handle group, the handle group comprising a handle pipe and a handle joint seat, the handle pipe extending into the handle joint seat, the handle pipe comprising an upper handle pipe and a lower handle pipe, the upper handle pipe being movable along the inside of the lower handle pipe; a support frame, the support frame being rotatably connected to the handle group, the support frame comprising a front pipe and a rear pipe, the front pipe and the rear pipe being pivotally connected; a first locking assembly, the first locking assembly being configured to lock the handle group relative to the support frame when the bicycle is in an unfolded state, the first locking assembly being configured to unlock the handle group relative to the support frame before the bicycle is switched from the unfolded state to a folded state, so as to realize the rotation of the handle pipe relative to the support frame; a first unlocking member, the first unlocking member being arranged between the handle pipe and the first locking assembly, the first unlocking member being configured to transmit the force of the upper handle pipe to the first locking assembly when the upper handle pipe falls along the lower handle pipe, so as to realize the unlocking of the first locking assembly; a second locking assembly, the second locking assembly being configured to lock the rotation between the front pipe and the rear pipe when the bicycle is in the unfolded state, the second locking assembly being configured to unlock the front pipe and the rear pipe before the bicycle is switched from the unfolded state to the folded state, so as to realize the folding rotation between the front pipe and the rear pipe; and a second unlocking member, the second unlocking member being arranged between the handle joint seat and the second locking assembly, the second unlocking member being configured to transmit the force of the rotation of the handle joint seat to the second locking assembly when the handle group rotates relative to the support frame, so as to realize the unlocking of the second locking assembly. The first locking assembly comprises a rotating member, a driving member, a first clamping tooth, and a first limiting seat, wherein the rotating member and the driving member are arranged between the handle joint seat and the first clamping tooth, the first clamping tooth is arranged between the handle joint seat and the first limiting seat, the rotating member is provided with a twisting part, the first unlocking member makes the rotating member rotate by contacting the twisting part, when the rotating member rotates, the rotating member pushes the driving member, the first clamping tooth is separated from the handle joint seat by the action of the driving member, and then the rotation of the handle group relative to the support frame is released.

2. The stroller frame of claim 1, wherein: The rotating member is provided with a first guide part, the driving member is provided with a second guide part in cooperation, the first guide part abuts against the second guide part, when the rotating member rotates, the first guide part pushes the second guide part, so that the driving member moves towards the direction of the first clamping tooth.

3. The stroller frame of claim 2, wherein: The first guide part comprises a first guide slope and a first guide plane, correspondingly, the second guide part comprises a second guide slope and a second guide plane, when the rotating member rotates, the first guide slope and the second guide slope form sliding between them, so that the driving member moves away from the rotating member, after the first guide plane and the second guide plane contact, the moving away action of the driving member stops.

4. The stroller frame of claim 3, wherein: The driving member further comprises a guide track, the first guide plane extends into the guide track, and the second guide part is arranged in the path of the guide track.

5. The stroller frame of claim 4, wherein: A first reset component for resetting the position of the first clamping tooth is arranged between the first clamping tooth and the first limiting seat, so that the first clamping tooth abuts against the handle joint seat and the first limiting seat.

6. A pushchair frame as claimed in any of Claims 2 to 5, wherein: ​ 7. The stroller frame of claim 2, wherein: The second locking assembly comprises a second clamping tooth and a second limiting seat, the second clamping tooth is arranged between the first limiting seat and the second limiting seat, the handle joint seat is provided with a third guide part, the third guide part abuts against the second unlocking part, when the handle joint seat rotates, the third guide part pushes the second unlocking part, the second unlocking part moves towards the direction of the second clamping tooth, and meanwhile the second unlocking part is separated from the first limiting seat.

8. A pushchair frame as claimed in claim 7, characterised in that: The third guide part comprises a third guide inclined surface and a third guide flat surface, correspondingly, the end of the second unlocking part towards the third guide part is provided with a fourth guide part, the fourth guide part comprises a fourth guide inclined surface and a fourth guide flat surface, when the handle joint seat rotates, the second unlocking part moves away from the handle joint seat through the sliding between the third guide inclined surface and the fourth guide inclined surface, and after the third guide flat surface and the fourth guide flat surface are contacted, the moving away action of the second unlocking part stops.

9. The stroller frame of claim 7, wherein: The end of the second unlocking part towards the second clamping tooth is provided with a driving column, the driving column abuts against the second clamping tooth.

10. A pushchair frame as claimed in any of Claims 7 to 9, wherein: A second reset part for resetting the position of the second clamping tooth is arranged between the second clamping tooth and the second limiting seat, so that the second clamping tooth abuts against the first limiting seat and the second limiting seat.

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