Stroller frame

Abstract

This invention discloses a stroller frame, relating to the field of stroller technology. Key technical features include two lower folding joints, two upper folding joints, a front wheel mechanism, a rear wheel mechanism, two lower push rods, and an upper push rod. The upper folding joints are unlocked via a folding unlock switch, and then the upper push rods rotate around these joints, folding the upper and lower push rods together. After the upper push rods rotate, the lower folding joints are unlocked via the upper folding joints. The folded upper and lower push rods then rotate around the lower folding joints under gravity, driving the front wheel mechanism to rotate around the lower folding joints, thus achieving folding. This invention utilizes rotation during the folding process to unlock, allowing for simultaneous folding and unlocking, followed by continued folding. This reduces the number of folding linkage structures, shortens the transmission path, facilitates smooth and stable folding, reduces the probability of malfunctions, and optimizes the user experience.

Description

Technical Field

[0001] This invention relates to the field of children's vehicle technology, and more specifically, to a children's vehicle frame. Background Technology

[0002] To facilitate storage and preservation, modern strollers typically feature a foldable design.

[0003] A Chinese patent with authorization announcement number CN217198315U discloses a gravity-folding automatic folding stroller frame. After the upper push rod assembly and the lower push rod assembly are unlocked, due to gravity, the lower push rod assembly rotates downward, causing the upper push rod assembly to rotate. The rotation of the upper push rod assembly causes the push rod support assembly to rotate. The rotation of the push rod support assembly causes the basket frame rod connecting piece to move upward and rotates the connected rear basket frame rod assembly towards the rear support assembly. The rear basket frame rod assembly drives the front basket frame rod assembly and rotates the connected front support assembly towards the rear support assembly. At the same time, the push rod support assembly drives the front armrest assembly and rotates the connected front armrest support assembly towards the rear support assembly. The front armrest support assembly drives the rear seat rod assembly to rotate towards the front seat rod assembly, thereby folding and collapsing all components.

[0004] Although the stroller frame in the aforementioned patent can automatically fold using gravity, its structure is relatively complex and the folding transmission path is relatively long. Since the weight of stroller frames is usually designed to be as small as possible, manual assistance is often required when folding, which affects the user experience. Moreover, the long transmission path is prone to failure. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a stroller frame that utilizes rotation during the folding process to unlock, enabling simultaneous folding and unlocking, followed by continued folding. This reduces the need for folding linkage structures, shortens the transmission path, facilitates smooth and stable folding, lowers the probability of malfunctions, and optimizes the user experience.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A stroller frame includes two lower folding joints, two upper folding joints, a front wheel mechanism connected to the two lower folding joints, a rear wheel mechanism connected to the two lower folding joints, two lower push rods, and an upper push rod connected to the two upper folding joints; one end of each lower push rod is connected to an upper folding joint, and the other end is connected to a lower folding joint. The upper push rod is provided with a folding unlock switch that acts on the upper folding joint, and the upper folding joint is used to unlock the lower folding joint; Specifically, the upper folding joint is unlocked by the folding unlock switch, and then the upper push rod is rotated around the upper folding joint to achieve folding of the upper and lower push rods; after the upper push rod is rotated, the lower folding joint is unlocked by the upper folding joint, and the folded upper and lower push rods rotate around the lower folding joint under the action of gravity, which drives the front wheel mechanism to rotate around the lower folding joint, thereby achieving folding.

[0007] Furthermore, a first unlocking cable is provided between the folding unlocking switch and the upper folding joint.

[0008] Furthermore, a second unlocking cable is provided between the upper folding joint and the lower folding joint.

[0009] Furthermore, the upper folding joint is unlocked by the folding unlock switch, and then the upper push rod is rotated counterclockwise around the upper folding joint to achieve the folding of the upper and lower push rods; after the upper push rod is rotated, the lower folding joint is unlocked by the upper folding joint, and the folded upper and lower push rods rotate clockwise around the lower folding joint under the action of gravity, which drives the front wheel mechanism to rotate counterclockwise around the lower folding joint, thereby achieving folding.

[0010] Furthermore, the upper folding joint includes an upper joint pivot part connected to the upper push rod, an upper joint base connected to the lower push rod, and a first limiting tooth disposed between the upper joint pivot part and the upper joint base; the upper joint pivot part and the upper joint base are respectively provided with a first tooth groove and a second tooth groove that cooperate with the first limiting tooth. The upper joint pivot is provided with a first rotating push block that contacts the first limiting tooth; one end of the first unlocking cable is connected to the first rotating push block, and the other end is connected to the folding unlocking switch; The first limiting tooth includes a first locking state that is respectively embedded in the first tooth groove and the second tooth groove, and a first unlocking state that is embedded in the second tooth groove; The folding unlock switch drives the first rotating push block to rotate via the first unlocking cable. While rotating, the first rotating push block moves axially and drives the first limiting tooth to move, so that the first limiting tooth switches from the first locked state to the first unlocked state, and the upper joint pivot can rotate.

[0011] Furthermore, a positioning ring is provided inside the upper joint base, and a cable positioning block is provided on the positioning ring extending axially into the first tooth groove. One end of the second unlocking cable is connected to the cable positioning block; a driving boss that cooperates with the cable positioning block is provided in the first tooth groove. The drive boss rotates with the upper joint pivot. When the drive boss rotates to contact the cable positioning block and drives the cable positioning block to rotate, the cable positioning block is unlocked by the second unlocking cable driving the lower folding joint.

[0012] Furthermore, the lower folding joint includes a lower joint base connected to the rear wheel mechanism, a lower joint first pivot part connected to the lower push rod, a lower joint second pivot part connected to the front wheel mechanism, a transmission plate connected between the lower joint first pivot part and the lower joint second pivot part, and a second limiting tooth disposed between the lower joint base and the lower joint first pivot part. The first pivot part of the lower joint and the base of the lower joint are respectively provided with a third tooth groove and a fourth tooth groove that cooperate with the second limiting tooth. The second limiting tooth includes a second locking state that is respectively embedded in the third tooth groove and the fourth tooth groove, and a second unlocking state that is embedded in the fourth tooth groove; The lower joint is provided with a second rotating push block that contacts the second limiting tooth, and the second rotating push block is connected to one end of the second unlocking cable. Wherein, the second unlocking cable drives the second rotating push block to rotate, and the second rotating push block moves axially while rotating, and drives the second limiting tooth to move, so that the second limiting tooth switches from the second locked state to the second unlocked state; then, the first pivot part of the lower joint can rotate around the first axis, and the first pivot part of the lower joint drives the second pivot part of the lower joint to rotate around the second axis through the transmission plate.

[0013] Furthermore, a first limiting groove is provided in the lower joint base, and a limiting block that contacts the second limiting tooth is provided in the first limiting groove. A second limiting groove that cooperates with the limiting block is provided on the second pivot part of the lower joint. The limiting block includes a third locked state, which is respectively embedded in the first limiting groove and the second limiting groove, and a third unlocked state, which is embedded in the first limiting groove. When the second limiting tooth moves, it drives the limiting block to switch from the third locked state to the third unlocked state, so that the second pivot part of the lower joint can rotate around the second axis.

[0014] Furthermore, the stroller frame also includes a seat plate mechanism connected to two lower folding joints respectively, and a foot support bracket hinged to the seat plate mechanism; a seat plate locking assembly is provided between the seat plate mechanism and the lower folding joint; after the seat plate mechanism is unlocked by the seat plate locking assembly, the seat plate mechanism can rotate and fold around the lower folding joint in a clockwise direction.

[0015] Furthermore, the lower folding joint includes a third pivot portion of the lower joint connected to the seat plate mechanism, and a lower joint base; the seat plate locking assembly includes a locking pin passing through the third pivot portion of the lower joint, and a locking groove that cooperates with the locking pin is provided on the lower joint base; a third unlocking cable is provided between the foot support bracket and the locking pin; wherein, when the foot support bracket is rotated relative to the seat plate mechanism in a clockwise direction, the foot support bracket drives the locking pin to move to disengage from the locking groove through the third unlocking cable, and the third pivot portion of the lower joint can rotate.

[0016] In summary, the present invention has the following beneficial effects: 1. This invention utilizes rotation during the folding process to unlock, enabling folding and unlocking simultaneously, followed by folding again. This reduces the need for folding linkage structures, shortens the transmission path, facilitates smooth and stable folding, reduces the probability of malfunctions, and optimizes the user experience. 2. Connect the third unlocking cable to the foot support bracket. Use the rotation of the foot support bracket during the folding process to unlock the seat plate mechanism. In this way, the foot support bracket is equivalent to the switch of the seat plate locking component. This arrangement can simplify the structure, eliminate an unlocking operation, and optimize the user experience. 3. The upper joint pivot is used to unlock the lower folding joint by rotating during the folding process, so that the upper joint pivot is equivalent to the unlocking switch of the lower folding joint. This arrangement simplifies the structure, eliminates an unlocking operation, and optimizes the user experience. 4. Setting a limiting block between the second pivot of the lower joint and the base of the lower joint is beneficial to improving the stability of the second pivot of the lower joint and the front wheel mechanism; using the second limiting tooth as the unlocking switch of the limiting block can simplify the structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the stroller frame structure in the embodiment. Figure 1 ; Figure 2 This is a schematic diagram of the stroller frame structure in the embodiment. Figure 2 ; Figure 3 This is a schematic diagram of the stroller frame structure in the embodiment. Figure 3 ; Figure 4 This is a schematic diagram of the foot support bracket, the third unlocking cable, and the lower folding joint in the embodiment. Figure 5 This is a schematic diagram of the locking pin, the third unlocking cable, and the lower folding joint in the embodiment. Figure 6 This is a schematic diagram of the lower folding joint in the embodiment. Figure 1 ; Figure 7This is a schematic diagram of the structure of the third pivot part of the lower joint in the embodiment; Figure 8 This is a schematic diagram of the upper folding joint in the embodiment. Figure 1 ; Figure 9 This is a schematic diagram of the upper folding joint in the embodiment. Figure 2 ; Figure 10 This is a schematic diagram of the positioning ring and cable positioning block in the embodiment; Figure 11 This is a schematic diagram of the lower folding joint in the embodiment. Figure 2 ; Figure 12 This is a schematic diagram of the lower folding joint in the embodiment. Figure 3 ; Figure 13 This is a schematic diagram of the structure of the lower joint base and the limiting block in the embodiment; Figure 14 This is a schematic diagram of the structure of the first pivot part of the lower joint, the second pivot part of the lower joint, and the transmission plate in the embodiment.

[0018] In the diagram: 1. Upper folding joint; 11. Upper joint base; 111. Second tooth groove; 12. Upper joint pivot; 121. First tooth groove; 122. Drive boss; 13. First limiting tooth; 14. First rotating push block; 151. Positioning ring; 152. Cable positioning block; 2. Lower folding joint; 21. Lower joint base; 211. Locking groove; 212. Fourth tooth groove; 213. First limiting groove; 22. Lower joint first pivot; 221. Third tooth groove; 23. Lower joint second pivot Part; 231, Second limiting groove; 24, Second limiting tooth; 25, Second rotating push block; 26, Limiting block; 27, Transmission plate; 28, Third pivot part of lower joint; 291, Fourth pivot part of lower joint; 292, Fifth pivot part of lower joint; 31, Upper push rod; 32, Lower push rod; 33, Folding unlocking switch; 41, Front wheel mechanism; 42, Rear wheel mechanism; 51, Seat plate mechanism; 52, Foot support bracket; 53, Locking pin; 54, Third unlocking cable; 6, Protective bracket; 7, Backrest bracket. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention. Example

[0021] A type of stroller frame, as shown in the reference Figures 1 to 14 It includes two lower folding joints 2, two upper folding joints 1, a front wheel mechanism 41 connected to the two lower folding joints 2, a rear wheel mechanism 42 connected to the two lower folding joints 2, two lower push rods 32, an upper push rod 31 connected to the two upper folding joints 1, a seat plate mechanism 51 connected to the two lower folding joints 2, a foot support bracket 52 hinged to the seat plate mechanism 51, a protective bracket 6 connected to the two lower folding joints 2, and a backrest bracket 7 connected to the two lower folding joints 2; one end of the lower push rod 32 is connected to the upper folding joint 1, and the other end is connected to the lower folding joint 2; a seat plate locking assembly is provided between the seat plate mechanism 51 and the lower folding joint 2; a folding unlocking switch 33 acting on the upper push rod 31 is provided, while the upper folding joint 1 is used to unlock the lower folding joint 2.

[0022] Reference Figures 1 to 14 In this embodiment, the stroller frame can be folded and includes two folding operations. The first folding operation is used to fold the seat plate mechanism 51, the foot support bracket 52, and the protective bracket 6. The second folding operation is used to fold the upper push rod 31, the lower push rod 32, the front wheel mechanism 41, and the rear wheel mechanism 42. In order to achieve the overall folding of the stroller frame, the first folding operation is usually performed first, and then the second folding operation is performed. This can optimize the structure, shorten the transmission path, facilitate smooth and stable folding, reduce the probability of failure, and optimize the user experience.

[0023] Reference Figures 1 to 14 In this embodiment, the lower folding joint 2 includes a lower joint base 21 connected to the rear wheel mechanism 42, a lower joint third pivot 28 connected to the seat plate mechanism 51, a lower joint fourth pivot 291 connected to the protective bracket 6, and a lower joint fifth pivot 292 connected to the backrest bracket 7. The lower joint third pivot 28, lower joint fifth pivot 292, lower joint fourth pivot 291 and lower joint base 21 are arranged sequentially along the axial direction, and the lower joint third pivot 28, lower joint fifth pivot 292 and lower joint fourth pivot 291 can rotate relative to the lower joint base 21 around a first axis. The lower joint fourth pivot 291 is provided with an axial extension ring at its end, and the lower joint fifth pivot 292 is rotatably sleeved on the axial extension ring. In this embodiment, there is no circumferential limit between the lower joint fifth pivot 292 and the axial extension ring.

[0024] Reference Figures 1 to 14A seat locking assembly is provided between the seat plate mechanism 51 and the lower folding joint 2. Specifically, in this embodiment, the seat locking assembly includes a locking pin 53 that passes through the third pivot part 28 of the lower joint, and a locking groove 211 that cooperates with the locking pin 53 is provided on the lower joint base 21. A third unlocking cable 54 is provided between the foot support bracket 52 and the locking pin 53. When the stroller frame is in the unfolded state, the foot support bracket 52 is located below the seat plate mechanism 51, and the angle of the foot support bracket 52 can be adjusted.

[0025] Reference Figures 1 to 14 During the first folding operation, the foot support bracket 52 is rotated clockwise relative to the seat plate mechanism 51, that is, the foot support bracket 52 is rotated upward. When the foot support bracket 52 rotates, it applies tension to the third unlocking cable 54, which in turn causes the locking pin 53 to move until it disengages from the locking groove 211, thereby unlocking the seat plate mechanism 51. Then, the foot support bracket 52 drives the seat plate mechanism 51 to continue rotating clockwise. After the third pivot part 28 of the lower joint contacts the fourth pivot part 291 of the lower joint, it drives the fourth pivot part 291 of the lower joint to rotate, thereby driving the protective bracket 6 to fold. Therefore, the first folding operation realizes the folding of the foot support bracket 52, the seat plate mechanism 51, and the protective bracket 6.

[0026] Reference Figures 1 to 14 Preferably, an elastic element is provided between the third pivot part 28 of the lower joint and the locking pin 53, and the elastic force of the elastic element makes the locking pin 53 tend to be embedded into the locking groove 211; in this embodiment, the third unlocking cable 54 is arranged at the bottom of the seat plate mechanism 51, and one end of the third unlocking cable 54 is fixedly connected to the locking pin 53, and the other end is fixedly connected to the foot support bracket 522.

[0027] Reference Figures 1 to 14 In this embodiment, the third unlocking cable 54 is connected to the foot support bracket 52. The foot support bracket 52 is used to unlock the seat plate mechanism 51 by rotating during the folding process, so that the foot support bracket 52 is equivalent to the switch of the seat plate locking component while folding. This arrangement simplifies the structure, eliminates an unlocking operation, and optimizes the user experience.

[0028] Reference Figures 1 to 14 In this embodiment, a first unlocking cable is provided between the folding unlocking switch 33 and the upper folding joint 1, and a second unlocking cable is provided between the upper folding joint 1 and the lower folding joint 2; the first unlocking cable is threaded through the upper push rod 31, and the second unlocking cable is threaded through the lower push rod 32.

[0029] Reference Figures 1 to 14During the second folding operation, the folding unlocking switch 33 applies tension to the first unlocking cable, which unlocks the upper folding joint 1. Then, the upper push rod 31 rotates counterclockwise around the upper folding joint 1, which means rotating the upper push rod 31 downwards, thus folding the upper push rod 31 and the lower push rod 32. After the upper push rod 31 rotates, the upper folding joint 1 applies tension to the second unlocking cable, which unlocks the lower folding joint 2. Next, the folded upper push rod 31 and lower push rod 32 rotate clockwise around the lower folding joint 2 under the action of gravity, which means rotating downwards and towards the rear wheel mechanism 42. Through the lower folding joint 2, the front wheel mechanism 41 is driven to rotate clockwise around the lower folding joint 2, so that the front wheel mechanism 41 moves closer to the rear wheel mechanism 42, thereby achieving folding.

[0030] Reference Figures 1 to 14 The upper push rod 31 rotates downward around the upper folding joint 1 until it contacts the folded seat plate mechanism 51. Then, the folded upper push rod 31, foot support bracket 52, seat plate mechanism 51, protective bracket 6, backrest bracket 7 and lower push rod 32 rotate around the lower folding joint 2 in the clockwise direction under the action of gravity, thereby realizing the folding of the entire frame.

[0031] Reference Figures 1 to 14 Specifically, in this embodiment, the upper folding joint 1 includes an upper joint pivot 12 connected to the upper push rod 31, an upper joint base 11 connected to the lower push rod 32, and a first limiting tooth 13 disposed between the upper joint pivot 12 and the upper joint base 11; the upper joint pivot 12 and the upper joint base 11 are respectively provided with a first tooth groove 121 and a second tooth groove 111 that cooperate with the first limiting tooth 13; the first limiting tooth 13 is axially movable and includes a first locked state that is respectively embedded in the first tooth groove 121 and the second tooth groove 111, and a first unlocked state that is embedded in the second tooth groove 111; an elastic member is disposed between the first limiting tooth 13 and the upper joint base 11, and the elastic force of the elastic member makes the first limiting tooth 13 tend to move to the first locked state.

[0032] Reference Figures 1 to 14 The upper joint pivot 12 is provided with a first rotating push block 14 that contacts the first limiting tooth 13. A guide slope is provided between the first rotating push block 14 and the upper joint pivot 12. Through the guide slope, the first rotating push block 14 moves axially relative to the upper joint pivot 12 while rotating. One end of the first unlocking cable is connected to the first rotating push block 14, and the other end is connected to the folding unlocking switch 33. The folding unlocking switch 33 is used to apply tension to the first unlocking cable. It can adopt various structures in the prior art, which will not be described in detail here.

[0033] Reference Figures 1 to 14The folding unlock switch 33 drives the first rotating push block 14 to rotate via the first unlocking cable. While rotating, the first rotating push block 14 moves axially and drives the first limiting tooth 13 to move. When the first limiting tooth 13 moves to disengage from the first tooth groove 121 and is embedded in the second tooth groove 111, the first limiting tooth 13 switches from the first locked state to the first unlocked state, and the upper joint pivot part 12 can rotate.

[0034] Reference Figures 1 to 14 In this embodiment, a positioning ring 151 is provided in the upper joint base 11, and a cable positioning block 152 extending axially into the first tooth groove 121 is provided on the positioning ring 151. One end of the second unlocking cable is connected to the cable positioning block 152. A driving boss 122 that cooperates with the cable positioning block 152 is provided in the first tooth groove 121. When the upper joint pivot 12 rotates, the driving boss 122 rotates with the upper joint pivot 12. The driving boss 122 rotates until it contacts the cable positioning block 152 and drives the cable positioning block 152 to rotate. The rotated cable positioning block 152 applies a pulling force to the second unlocking cable, thereby driving the lower folding joint 2 to unlock through the second unlocking cable.

[0035] Reference Figures 1 to 14 In this embodiment, the upper joint pivot 12 is used to unlock the lower folding joint 2 by rotating during the folding process, so that the upper joint pivot 12 is equivalent to the unlocking switch of the lower folding joint 2 while folding. This arrangement simplifies the structure, eliminates an unlocking operation, and optimizes the user experience.

[0036] Reference Figures 1 to 14 In this embodiment, the lower folding joint 2 further includes a first pivot part 22 of the lower joint connected to the lower push rod 32, a second pivot part 23 of the lower joint connected to the front wheel mechanism 41, a transmission plate 27 connecting the first pivot part 22 of the lower joint and the second pivot part 23 of the lower joint, and a second limiting tooth 24 disposed between the lower joint base 21 and the first pivot part 22 of the lower joint; the first pivot part 22 of the lower joint and the lower joint base 21 are respectively provided with a third tooth groove 221 and a fourth tooth groove 212 that cooperate with the second limiting tooth 24; the second limiting tooth 24 can move axially and includes teeth respectively embedded in the third tooth groove 221. The second locking state within the fourth tooth groove 212 and the second unlocking state embedded within the fourth tooth groove 212; a second rotating push block 25 is provided in the first pivot part 22 of the lower joint, which contacts the second limiting tooth 24, and the second rotating push block 25 is connected to one end of the second unlocking cable; that is, one end of the second unlocking cable is connected to the cable positioning block 152, and the other end is connected to the second rotating push block 25; a guide slope is provided between the second rotating push block 25 and the first pivot part 22 of the lower joint, and through the guide slope, the second rotating push block 25 moves axially relative to the first pivot part 22 of the lower joint while rotating.

[0037] Reference Figures 1 to 14 After the cable positioning block 152 rotates, it applies tension to the second unlocking cable. The second unlocking cable then drives the second rotating push block 25 to rotate. While rotating, the second rotating push block 25 moves axially and drives the second limiting tooth 24 to move. The second limiting tooth 24 moves until it disengages from the third tooth groove 221 and is embedded in the fourth tooth groove 212. Then, the second limiting tooth 24 switches from the second locked state to the second unlocked state. An elastic element is provided between the second limiting tooth 24 and the lower joint base 21. The elastic force of the elastic element makes the second limiting tooth 24 tend to move to the second locked state.

[0038] Reference Figures 1 to 14 The lower joint base 21 is provided with a first limiting groove 213, and a limiting block 26 that contacts the second limiting tooth 24 is provided in the first limiting groove 213. The second pivot part 23 of the lower joint is provided with a second limiting groove 231 that cooperates with the limiting block 26. The limiting block 26 can move axially and includes a third locking state that is respectively embedded in the first limiting groove 213 and the second limiting groove 231, and a third unlocking state that is embedded in the first limiting groove 213. An elastic member is provided between the lower joint base 21 and the limiting block 26. The elastic force of the elastic member makes the limiting block 26 tend to move to the third locking state.

[0039] Reference Figures 1 to 14 In this embodiment, when the second limiting tooth 24 contacts the limiting block 26, the second limiting tooth 24 drives the limiting block 26 to move until it disengages from the second limiting groove 231 and is embedded in the first limiting groove 213, that is, the limiting block 26 switches from the third locked state to the third unlocked state.

[0040] Reference Figures 1 to 14 After the second limiting tooth 24 switches to the second unlocked state, the first pivot part 22 of the lower joint can rotate around the first axis; after the limiting block 26 switches to the third unlocked state, the second pivot part 23 of the lower joint can rotate around the second axis; wherein, the first axis is parallel to the second axis; a transmission plate 27 is hinged between the first pivot part 22 and the second pivot part 23 of the lower joint, so that when the first pivot part 22 of the lower joint rotates, it drives the second pivot part 23 of the lower joint to rotate through the transmission plate 27, thereby realizing the automatic folding of the front wheel mechanism 41.

[0041] Reference Figures 1 to 14 In this embodiment, a limiting block 26 is provided between the second pivot part 23 of the lower joint and the base 21 of the lower joint, which is beneficial to improve the stability of the second pivot part 23 of the lower joint and the front wheel mechanism 41; the second limiting tooth 24 is used as the unlocking switch of the limiting block 26, which simplifies the structure.

Claims

1. A stroller frame, characterized in that: It includes two lower folding joints, two upper folding joints, a front wheel mechanism connected to the two lower folding joints, a rear wheel mechanism connected to the two lower folding joints, two lower push rods, and upper push rods connected to the two upper folding joints. One end of the lower push rod is connected to the upper folding joint, and the other end is connected to the lower folding joint; The upper push rod is provided with a folding unlock switch that acts on the upper folding joint, and the upper folding joint is used to unlock the lower folding joint; Specifically, the upper folding joint is unlocked by the folding unlock switch, and then the upper push rod is rotated around the upper folding joint to achieve the folding of the upper push rod and the lower push rod; After the upper push rod rotates, it unlocks the lower folding joint through the upper folding joint. Then, the folded upper and lower push rods rotate around the lower folding joint under the action of gravity, and drive the front wheel mechanism to rotate around the lower folding joint, thereby realizing folding.

2. The stroller frame according to claim 1, characterized in that: A first unlocking cable is provided between the folding unlocking switch and the upper folding joint.

3. The stroller frame according to claim 2, characterized in that: A second unlocking cable is provided between the upper folding joint and the lower folding joint.

4. The stroller frame according to claim 1, characterized in that: Unlock the upper folding joint by using the folding unlock switch, and then rotate the upper push rod around the upper folding joint in a counterclockwise direction to achieve the folding of the upper push rod and the lower push rod. After the upper push rod rotates, it unlocks the lower folding joint through the upper folding joint. Then, the folded upper and lower push rods rotate clockwise around the lower folding joint under the action of gravity, and drive the front wheel mechanism to rotate counterclockwise around the lower folding joint, thereby realizing folding.

5. The stroller frame according to claim 3, characterized in that: The upper folding joint includes an upper joint pivot part connected to the upper push rod, an upper joint base connected to the lower push rod, and a first limiting tooth disposed between the upper joint pivot part and the upper joint base; the upper joint pivot part and the upper joint base are respectively provided with a first tooth groove and a second tooth groove that cooperate with the first limiting tooth. The upper joint pivot is provided with a first rotating push block that contacts the first limiting tooth; one end of the first unlocking cable is connected to the first rotating push block, and the other end is connected to the folding unlocking switch; The first limiting tooth includes a first locking state that is respectively embedded in the first tooth groove and the second tooth groove, and a first unlocking state that is embedded in the second tooth groove; The folding unlock switch drives the first rotating push block to rotate via the first unlocking cable. While rotating, the first rotating push block moves axially and drives the first limiting tooth to move, so that the first limiting tooth switches from the first locked state to the first unlocked state, and the upper joint pivot can rotate.

6. The stroller frame according to claim 5, characterized in that: A positioning ring is provided inside the upper joint base, and a cable positioning block is provided on the positioning ring, extending axially into the first tooth groove. One end of the second unlocking cable is connected to the cable positioning block. A driving boss that cooperates with the cable positioning block is provided in the first tooth groove. The drive boss rotates with the upper joint pivot. When the drive boss rotates to contact the cable positioning block and drives the cable positioning block to rotate, the cable positioning block is unlocked by the second unlocking cable driving the lower folding joint.

7. The stroller frame according to claim 3, characterized in that: The lower folding joint includes a lower joint base connected to the rear wheel mechanism, a lower joint first pivot part connected to the lower push rod, a lower joint second pivot part connected to the front wheel mechanism, a transmission plate connected between the lower joint first pivot part and the lower joint second pivot part, and a second limiting tooth disposed between the lower joint base and the lower joint first pivot part. The first pivot part of the lower joint and the base of the lower joint are respectively provided with a third tooth groove and a fourth tooth groove that cooperate with the second limiting tooth. The second limiting tooth includes a second locking state that is respectively embedded in the third tooth groove and the fourth tooth groove, and a second unlocking state that is embedded in the fourth tooth groove; The lower joint is provided with a second rotating push block that contacts the second limiting tooth, and the second rotating push block is connected to one end of the second unlocking cable. Wherein, the second unlocking cable drives the second rotating push block to rotate, and the second rotating push block moves axially while rotating, and drives the second limiting tooth to move, so that the second limiting tooth switches from the second locked state to the second unlocked state; then, the first pivot part of the lower joint can rotate around the first axis, and the first pivot part of the lower joint drives the second pivot part of the lower joint to rotate around the second axis through the transmission plate.

8. The stroller frame according to claim 7, characterized in that: The lower joint base is provided with a first limiting groove, and a limiting block that contacts the second limiting tooth is provided in the first limiting groove. The second pivot part of the lower joint is provided with a second limiting groove that cooperates with the limiting block. The limiting block includes a third locked state, which is respectively embedded in the first limiting groove and the second limiting groove, and a third unlocked state, which is embedded in the first limiting groove. When the second limiting tooth moves, it drives the limiting block to switch from the third locked state to the third unlocked state, so that the second pivot part of the lower joint can rotate around the second axis.

9. The stroller frame according to claim 1, characterized in that: The stroller frame also includes a seat plate mechanism connected to two lower folding joints respectively, and a foot support bracket hinged to the seat plate mechanism; a seat plate locking assembly is provided between the seat plate mechanism and the lower folding joints; After the seat plate mechanism is unlocked by the seat plate locking assembly, the seat plate mechanism can rotate and fold around the lower folding joint in the clockwise direction.

10. The stroller frame according to claim 9, characterized in that: The lower folding joint includes a third pivot portion of the lower joint connected to the seat plate mechanism, and a lower joint base; the seat plate locking assembly includes a locking pin passing through the third pivot portion of the lower joint, and a locking groove that cooperates with the locking pin is provided on the lower joint base; a third unlocking cable is provided between the foot support bracket and the locking pin; wherein, when the foot support bracket is rotated relative to the seat plate mechanism in a clockwise direction, the foot support bracket drives the locking pin to move to disengage from the locking groove through the third unlocking cable, and the third pivot portion of the lower joint can rotate.

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