A children's stroller frame

Abstract

This utility model discloses a stroller frame. The main body of the frame includes a left side frame, a right side frame, and a connecting frame. The left side frame includes a left bottom rod, with a left support rod rotatably connected to its rear end. A first left sliding member is provided on the left bottom rod, and a left linkage rod rotatably connected to both the first left sliding member and the left support rod is located between their middle portions. A left push rod assembly is rotatably connected to the upper end of the left support rod, and a second left sliding member is provided on the left support rod. A left transmission rod rotatably connected to both the second left sliding member and the left push rod assembly is located between their middle portions. The right side frame includes a right bottom rod, with a right support rod rotatably connected to its rear end. A first right sliding member is provided on the right bottom rod, and a right linkage rod rotatably connected to both the first right sliding member and the right support rod is located between their middle portions. A right push rod assembly is rotatably connected to the upper end of the right support rod, and a second right sliding member is provided on the right support rod. A right transmission rod rotatably connected to both the second right sliding member and the right push rod assembly is located between their middle portions. This utility model features flexible folding and a small folded size.

Description

[Technical Field]

[0001] This utility model relates to a children's stroller frame. [Background Technology]

[0002] Strollers are a common product during a child's growth. Most current strollers can be unfolded or folded; when unfolded, they provide a comfortable ride for children, while when folded, they are convenient to carry or store. However, the structures and folding principles of stroller frames on the market vary widely. Therefore, this invention provides a novel stroller frame that differs from existing ones. [Utility Model Content]

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a children's stroller frame that is simple in structure, flexible in folding, and small in size after folding.

[0004] This utility model is achieved through the following technical solution:

[0005] A stroller frame for children, capable of moving from an unfolded state to a folded state after the locking device is unlocked, includes a frame body with front and rear wheels. The frame body includes a left side frame, a right side frame, and a connecting frame laterally connecting the left and right side frames. The left side frame includes a left bottom rod, with a rotatable left support rod at its rear end. A first left sliding member is provided on the left bottom rod, and a left linkage rod rotatably connected to the first left sliding member and the left support rod is located between the middle of the first left sliding member and the left support rod. A left push rod assembly is rotatably connected to the upper end of the left support rod, and a left push rod assembly is provided on the left support rod. The second left sliding member is movable, and a left transmission rod is provided between the second left sliding member and the left push rod assembly, which are rotatably connected to both; the right side frame includes a right bottom rod, and a right support rod that can rotate relative to the rear end of the right bottom rod is provided. A first right sliding member that can slide along the right bottom rod is provided. A right linkage rod that is rotatably connected between the first right sliding member and the middle part of the right support rod is provided. A right push rod assembly is rotatably connected to the upper end of the right support rod. A second right sliding member that can slide along the right support rod is provided. A right transmission rod that is rotatably connected between the second right sliding member and the right push rod assembly is provided.

[0006] The front wheels include a left front wheel located at the front end of the left bottom rod and a right front wheel located at the front end of the right bottom rod. The rear wheels include a left rear wheel located at the rear end of the left bottom rod or the lower end of the left support rod and a right rear wheel located at the rear end of the right bottom rod or the lower end of the right support rod.

[0007] The connecting frame includes a bottom connecting frame and an upper connecting frame. The bottom connecting frame includes a first connecting rod and a second connecting rod that intersect and are rotatably connected at the intersection. A first connecting head is rotatably connected to the first left sliding member. A second connecting head is rotatably connected to the lower end of the left support rod. A third connecting head is rotatably connected to the first right sliding member. A fourth connecting head is rotatably connected to the lower end of the right support rod. The front end of the first connecting rod is rotatably connected to the first connecting head, and the rear end of the first connecting rod is rotatably connected to the fourth connecting head. The front end of the second connecting rod is rotatably connected to the third connecting head, and the rear end of the second connecting rod is rotatably connected to the fourth connecting head. The second connector is rotatably connected; the upper connecting frame includes a third connecting rod and a fourth connecting rod that intersect and are rotatably connected at the intersection position; a fifth connector is rotatably connected to the second left sliding member; a sixth connector is rotatably connected to the upper end of the left support rod; a seventh connector is rotatably connected to the second right sliding member; an eighth connector is rotatably connected to the upper end of the right support rod; the upper end of the third connecting rod is rotatably connected to the eighth connector; the lower end of the third connecting rod is rotatably connected to the fifth connector; the upper end of the fourth connecting rod is rotatably connected to the sixth connector; and the lower end of the fourth connecting rod is rotatably connected to the seventh connector.

[0008] The left side frame also includes a left seat rod, the upper end of which is rotatably connected to a left sliding sleeve that allows the left seat rod to slide inside. The rear end of the left seat rod is provided with a left connecting part, which is rotatably connected to a left transmission rod. The right side frame also includes a right seat rod, the upper end of which is rotatably connected to a right sliding sleeve that allows the right seat rod to slide inside. The rear end of the right seat rod is provided with a right connecting part, which is rotatably connected to a right transmission rod.

[0009] A folding frame is provided between the left and right seat sticks. The folding frame includes a first folding rod and a second folding rod that cross each other and are rotatably connected at the intersection. The front end of the first folding rod is rotatably connected to the front end of the right seat stick. A third folding rod is rotatably connected to the rear end of the first folding rod and the rear end of the left seat stick. The front end of the second folding rod is rotatably connected to the front end of the left seat stick. A fourth folding rod is rotatably connected to the rear end of the second folding rod and the rear end of the right seat stick.

[0010] The left support rod includes a left rod body and a left extension fixed to the middle of the left rod body and extending to one side therefrom, and the upper end of the left linkage rod is rotatably connected to the left extension part; the right support rod includes a right rod body and a right extension fixed to the middle of the right rod body and extending to one side therefrom, and the upper end of the right linkage rod is rotatably connected to the right extension part.

[0011] The left push rod assembly includes a lower left push rod rotatably connected to the upper end of the left support rod, and an upper left push rod is slidably connected inside the lower left push rod; the right push rod assembly includes a lower right push rod rotatably connected to the upper end of the right support rod, and an upper right push rod is slidably connected inside the lower right push rod.

[0012] The lower left push rod is fixedly connected to a left extension block extending to one side, and the upper end of the left transmission rod is rotatably connected to the left extension block; the lower right push rod is fixedly connected to a right extension block extending to one side, and the upper end of the right transmission rod is rotatably connected to the right extension block.

[0013] The locking device includes a left-side locking mechanism, which includes a first left-side locking structure located between the upper left push rod and the lower left push rod, a second left-side locking structure located between the second left sliding member and the left support rod, and a third left-side locking structure located between the first left sliding member and the left bottom rod. The lower part of the lower left push rod is provided with a first linkage unlocking member that can be pushed by the upper left push rod to unlock the second left-side locking structure when the upper left push rod slides down. The second left sliding member is a sliding sleeve sleeved on the left support rod. The left support rod is provided with a second linkage unlocking member that can be pushed by the sliding sleeve to unlock the third left-side locking structure when the sliding sleeve slides down.

[0014] The second left locking mechanism includes a second locking hole on the sliding sleeve. A second locking pin, which can slide within the left support rod and engage or disengage from the second locking hole, is provided inside the left support rod. The first linkage unlocking component includes a first unlocking block, which can slide upwards within the left support rod to disengage the second locking pin from the second locking hole. A first rotating block is rotatably connected to the lower end of the lower left push rod. A second pull rope, which can pull the first unlocking block upwards when the first rotating block rotates, is provided between the first rotating block and the first unlocking block. A sliding rod, which can be pushed and slid by the upper left push rod, is also provided at the lower part of the lower left push rod. A pushing part, which can push the first rotating block to rotate, is provided at the lower end of the sliding rod. A third return spring, which can push the sliding rod back to its original position, is provided between the sliding rod and the lower left push rod. A fourth return spring is provided between the second locking pin and the left support rod to push the second locking pin back to its original position; the third left locking structure includes a locking groove on the first left sliding member, and a locking hook that can engage or disengage from the locking groove is rotatably connected to the left bottom rod; the second linkage unlocking member includes a second rotating block rotatably connected to the left support rod, and an outward protrusion that extends outward from the left support rod and can be pushed into the left support rod by a downward sliding sleeve; a third pull rope is provided between the second rotating block and the locking hook, which can pull the locking hook to disengage from the locking groove when the sliding sleeve pushes the outward protrusion and causes the second rotating block to rotate; a fifth return spring is provided between the locking hook and the left bottom rod to push the locking hook back to its original position, and an inclined surface that can be pushed when the sliding sleeve slides upward.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. When folding, the left push rod assembly rotates backward relative to the left support rod, and the right push rod assembly rotates backward relative to the right support rod. Therefore, the left transmission rod pushes the second left sliding member downward along the left support rod, and the right transmission rod pushes the second right sliding member downward along the right support rod. During this process, the left push rod assembly moves closer to the left support rod, and the right push rod assembly moves closer to the right support rod. Furthermore, the lower end of the left support rod rotates relative to the left bottom rod, and the lower end of the right support rod rotates relative to the right bottom rod. The left linkage rod then pushes the first left sliding member forward along the left bottom rod, and the right linkage rod pushes the first right sliding member forward along the right bottom rod, thus bringing the left support rod closer to the left bottom rod and the right support rod closer to the right bottom rod. The entire folding process is very convenient and quick; simply rotate the left and right push rod assemblies backward. It is flexible to fold, has a small folded size, and is easy to carry or store.

[0017] 2. When this utility model is folded, the upper and lower ends of the left transmission rod rotate relative to the left push rod assembly and the second left sliding member, respectively, pushing the second left sliding member downward. The left transmission rod pulls the left seat rod and rotates relative to the rear end of the left seat rod. The left seat rod slides backward in the left sliding sleeve. The left sliding sleeve rotates relative to the left support rod, so that the left seat rod can also move closer to the left support rod. During this process, the upper and lower ends of the right transmission rod rotate relative to the right push rod assembly and the second right sliding member, respectively, pushing the second right sliding member downward. The right transmission rod pulls the right seat rod and rotates relative to the rear end of the right seat rod. The right seat rod slides backward in the right sliding sleeve. The right sliding sleeve rotates relative to the right support rod, so that the right seat rod can also move closer to the right support rod. This realizes the linkage folding of the left and right seat rods, making the entire stroller frame easy and smooth to fold.

[0018] 3. During the process of the left push rod assembly and left support rod rotating towards the left bottom rod and the right push rod assembly and right support rod rotating towards the right bottom rod, the bottom connecting frame and the upper connecting frame can simultaneously make the left side frame and the right side frame move closer to each other in the lateral direction, thereby reducing the size of the stroller frame in the left and right lateral directions, ensuring that the volume after folding is further reduced, making it easier to carry or store. [Attached Image Description]

[0019] Figure 1 This is one of the three-dimensional views of the unfolded state of this utility model;

[0020] Figure 2 This is the second perspective view of the unfolded state of this utility model;

[0021] Figure 3 This is a side view of the utility model in its unfolded state;

[0022] Figure 4This is one of the perspective views of the folding process of this utility model;

[0023] Figure 5 This is the second perspective view of the folding process of this utility model;

[0024] Figure 6 This is a side view of the present invention during the folding process;

[0025] Figure 7 This is a side view of the folded state of this utility model;

[0026] Figure 8 This is one of the partial sectional views of this utility model;

[0027] Figure 9 yes Figure 8 Enlarged view of point A in the middle;

[0028] Figure 10 yes Figure 8 Enlarged view at point B;

[0029] Figure 11 yes Figure 8 A magnified view at point C;

[0030] Figure 12 yes Figure 8 A magnified view at point D;

[0031] Figure 13 This is the second partial sectional view of this utility model.

Detailed Implementation Methods

[0032] The present invention will be further described below with reference to the accompanying drawings:

[0033] like Figures 1 to 7 As shown, a stroller frame includes a frame body 100, with front and rear wheels mounted on the frame body 100 for movement. The stroller frame can be used for children to ride in when unfolded, and is easy to carry or store when folded. For safety, the stroller frame is locked in the unfolded state by a locking device. Unlocking the locking device allows it to be moved from the unfolded state to the folded state. The locking device can be a conventional locking structure; however, this embodiment also provides a specific locking structure, which will be described in detail later. In this embodiment, the frame body 100 includes a left frame 1, a right frame 2, and a connecting frame 3 that horizontally connects the left frame 1 and the right frame 2. When folded, the left frame 1 and the right frame 2 fold simultaneously for convenient and smooth folding operation.

[0034] like Figures 1 to 7As shown, the left side frame 1 includes a left bottom rod 11, and a left support rod 12 that can rotate relative to the left bottom rod 11 is provided at its rear end. A first left sliding member 13 that can slide along the left bottom rod 11 is provided. A left linkage rod 14 that is rotatably connected to the left support rod 12 is provided between the first left sliding member 13 and the middle of the left support rod 12. A left push rod assembly 15 is rotatably connected to the upper end of the left support rod 12. A second left sliding member 16 that can slide along the left support rod 12 is provided. A left transmission rod 16 that is rotatably connected to the second left sliding member 16 and the left push rod assembly 15 is provided between the second left sliding member 16 and the left push rod assembly 15. 7; The right side frame 2 includes a right bottom rod 21, and a right support rod 22 that can rotate relative to the rear end of the right bottom rod 21. A first right sliding member 23 that can slide along the right bottom rod 21 is provided. A right linkage rod 24 that is rotatably connected to the right support rod 22 is provided between the first right sliding member 23 and the middle of the right support rod 22. A right push rod assembly 25 is rotatably connected to the upper end of the right support rod 22. A second right sliding member 26 that can slide along the right support rod 22 is provided. A right transmission rod 27 that is rotatably connected to the second right sliding member 26 and the right push rod assembly 25 is provided. The front wheels include a left front wheel 18 located at the front end of the left bottom rod 11 and a right front wheel 28 located at the front end of the right bottom rod 21. The rear wheels include a left rear wheel 19 located at the rear end of the left bottom rod 11 and a right rear wheel 29 located at the rear end of the right bottom rod 21. Alternatively, the left rear wheel 19 can be located at the lower end of the left support rod 12, and the right rear wheel 29 can also be located at the lower end of the right support rod 22. During folding, the left push rod assembly 15 rotates backward relative to the left support rod 12 and the right push rod assembly 25 rotates backward relative to the right support rod 22. Therefore, the left transmission rod 17 pushes the second left sliding member 16 to slide downward along the left support rod 12 and the right transmission rod 27 pushes the second right sliding member 26 to slide downward along the right support rod 22. During this process, the left push rod assembly 15 moves closer to the left support rod 12 and the right push rod assembly 25 moves closer to the right support rod 22. The lower end of the left support rod 12 rotates relative to the left bottom rod 11 and the lower end of the right support rod 22 rotates relative to the right bottom rod 21. The left linkage rod 14 pushes the first left sliding member 13 to slide forward along the left bottom rod 11 and the right linkage rod 24 pushes the first right sliding member 23 to slide forward along the right bottom rod 11, so that the left support rod 12 moves closer to the left bottom rod 11 and the right support rod 22 moves closer to the right bottom rod 21. The entire folding process is very convenient and quick; simply rotate the left push rod assembly 15 and the right push rod assembly 25 backward. It folds flexibly and is compact in size when folded, making it easy to carry or store. In this embodiment, the first left sliding member 13 and the first right sliding member 23 are block-shaped sliding blocks. The left bottom rod 11 and the right bottom rod 21 are provided with sliding grooves for the sliding blocks to slide through. Furthermore, the second left sliding member 16 and the second sliding member 26 are sleeve-shaped sliding sleeves that fit over the left support rod 12 and the right support rod 22, ensuring smooth folding of the stroller frame.

[0035] like Figure 3 , Figure 4 as well as Figure 12 As shown, the left support rod 12 includes a left rod body 121 and a left extension 122 fixed to the middle of the left rod body 121 and extending to one side. The upper end of the left linkage rod 14 is rotatably connected to the left extension 122. The right support rod 22 includes a right rod body 221 and a right extension 222 fixed to the middle of the right rod body 221 and extending to one side. The upper end of the right linkage rod 24 is rotatably connected to the right extension 222. By setting the left extension 122 and the right extension 222, the movable connection positions of the upper ends of the left linkage rod 14 and the right linkage rod 24 are reasonably set, so that the stroller frame can be smoothly and flexibly folded. The left extension 122 and the right extension 222 can be fixed to the corresponding left support rod 12 and right support rod 22 using L-shaped iron plates.

[0036] like Figures 1 to 7 As shown, the left side frame 1 also includes a left seat rod 101, and the upper end of the left support rod 12 is rotatably connected to a left sliding sleeve 102 that allows the left seat rod 101 to slide inside. The rear end of the left seat rod 101 is provided with a left connecting part 103, and the left connecting part 103 is rotatably connected to the left transmission rod 17. The right side frame 2 also includes a right seat rod 201, and the upper end of the right support rod 22 is rotatably connected to a right sliding sleeve 202 that allows the right seat rod 201 to slide inside. The rear end of the right seat rod 201 is provided with a right connecting part 203, and the right connecting part 203 is rotatably connected to the right transmission rod 27. When the stroller frame is folded, the upper and lower ends of the left drive rod 17 rotate relative to the left push rod assembly 15 and the second left sliding member 16, respectively, pushing the second left sliding member 16 downward. The left drive rod 17 pulls the left seat rod 101 and rotates relative to its rear end. The left seat rod 101 slides backward within the left sliding sleeve 102. The left sliding sleeve 102 rotates relative to the left support rod 12, so that the left seat rod 101 can eventually come close to the left support rod 12. During this process, the upper and lower ends of the right drive rod 27 rotate relative to the right push rod assembly 15 and the second left sliding member 16, respectively. The push rod assembly 25 rotates relative to the second right sliding member 26, pushing the second right sliding member 26 to slide downward. The right transmission rod 27 pulls the right seat rod 201 and rotates relative to the rear end of the right seat rod 201. The right seat rod 201 slides backward in the right sliding sleeve 202. The right sliding sleeve 202 rotates relative to the right support rod 22, so that the right seat rod 201 can also come close to the right support rod 22. This realizes the linkage folding of the left seat rod 101 and the right seat rod 201, making the entire stroller frame easy and smooth to fold.

[0037] like Figures 1 to 5As shown, the connecting frame 3 includes a bottom connecting frame 31 and an upper connecting frame 32. The bottom connecting frame 31 includes a first connecting rod 315 and a second connecting rod 316 that intersect and are rotatably connected at the intersection. A first connecting head 311 is rotatably connected to the first left sliding member 13. A second connecting head 312 is rotatably connected to the lower end of the left support rod 12. A third connecting head 313 is rotatably connected to the first right sliding member 23. A fourth connecting head 314 is rotatably connected to the lower end of the right support rod 22. The front end of the first connecting rod 315 is rotatably connected to the first connecting head 311, and the rear end of the first connecting rod 315 is rotatably connected to the fourth connecting head 314. The front end of the second connecting rod 316 is rotatably connected to the third connecting head 313, and the rear end of the second connecting rod 316 is rotatably connected to the third connecting head 313. The upper connecting frame 32 includes a third connecting rod 323 and a fourth connecting rod 324 that are intersecting and rotatably connected at the intersection position. A fifth connecting rod 325 is rotatably connected to the second left sliding member 16. A sixth connecting rod 326 is rotatably connected to the upper end of the left support rod 12. A seventh connecting rod 327 is rotatably connected to the second right sliding member 26. An eighth connecting rod 328 is rotatably connected to the upper end of the right support rod 22. The upper end of the third connecting rod 323 is rotatably connected to the eighth connecting rod 328. The lower end of the third connecting rod 323 is rotatably connected to the fifth connecting rod 325. The upper end of the fourth connecting rod 324 is rotatably connected to the sixth connecting rod 326. The lower end of the fourth connecting rod 324 is rotatably connected to the seventh connecting rod 327. When the stroller frame is folded, the first left sliding member 13 pulls the first connecting rod 315 forward and the first right sliding member 23 pulls the second connecting rod 316 forward, causing the first connecting rod 315 and the second connecting rod 316, which were originally at a large opening angle, to close together. During this process, the second left sliding member 26 pulls the third connecting rod 323 downward and the second right sliding member 26 pulls the fourth connecting rod 324 downward, causing the third connecting rod 323 and the fourth connecting rod 324, which were originally at a large opening angle, to close together. This causes the left frame 1 and the right frame 2 to also close together in the left and right lateral directions, further reducing the volume of the stroller frame after folding.

[0038] like Figures 1 to 5As shown, a folding frame is provided between the left seat stick 101 and the right seat stick 201. The folding frame includes a first folding rod 41 and a second folding rod 42 that cross each other and are rotatably connected at the intersection. The front end of the first folding rod 41 is rotatably connected to the front end of the right seat stick 201. A third folding rod 43 is provided between the rear end of the first folding rod 41 and the rear end of the left seat stick 101 and is rotatably connected to both. The front end of the second folding rod 42 is rotatably connected to the front end of the left seat stick 101. A fourth folding rod 44 is provided between the rear end of the second folding rod 42 and the rear end of the right seat stick 201 and is rotatably connected to both. As the left seat post 101 slides within the left sliding sleeve 102 and the right seat post 201 slides within the right sliding sleeve 202, the rear end of the left seat post 101 pulls the third folding rod 43 and the rear end of the right seat post 201 pulls the fourth folding rod 44. Combined with the bottom connecting frame 31 and the upper connecting frame 32, this causes the left frame 1 and the right frame 2 to fold laterally. Therefore, the first folding rod 41 and the second folding rod 42, which were originally at a large opening angle, also close laterally. The folding frame design enhances the mechanical strength of the stroller frame, providing the capacity to support a child, and also allows the stroller frame to fold laterally, making the stroller frame flexible to close.

[0039] like Figures 1 to 5 As shown, the left push rod assembly 15 includes a lower left push rod 151 rotatably connected to the upper end of the left support rod 12, and an upper left push rod 152 is slidably connected inside the lower left push rod 151; the right push rod assembly 25 includes a lower right push rod 251 rotatably connected to the upper end of the right support rod 22, and an upper right push rod 252 is slidably connected inside the lower right push rod 251. A left extension block 153 extending to one side is fixedly connected to the lower left push rod 151. The upper end of the left transmission rod 17 is rotatably connected to the left extension block 153. A right extension block 253 extending to one side is fixedly connected to the lower right push rod 251. The upper end of the right transmission rod 27 is rotatably connected to the right extension block 253. A horizontally foldable push handle is provided between the upper left push rod 152 and the upper right push rod 252. The push handle includes a left push handle 301 and a right push handle 302. The inner ends of the left push handle 301 and the right push handle 302 are rotatably connected to each other, and a locking component 303 is provided at the rotatable connection position. The outer end of the left push handle 301 is rotatably connected to the upper left push rod 152, and the outer end of the right push handle 302 is rotatably connected to the upper right push rod 252. The push handle is designed for easy pushing of the stroller. To avoid interference when the stroller frame is folded laterally, the push handle is designed to be foldable. Specifically, when the stroller frame needs to be folded, first unlock the locking assembly 303, then push down the left push handle 301 and the right push handle 302, and rotate the upper left push rod 152 and the upper right push rod 252 (as shown). Figure 4At this point, further folding operations can continue. The locking component 303 can adopt a traditional press-type locking structure, which will not be described in detail here.

[0040] The locking device of this embodiment is described in detail below, such as... Figures 8 to 13 As shown, the locking device includes a left locking mechanism, which includes a first left locking structure 5 located between the upper left push rod 152 and the lower left push rod 151, a second left locking structure 6 located between the second left sliding member 16 and the left support rod 12, and a third left locking structure 7 located between the first left sliding member 13 and the left bottom rod 11. The lower part of the lower left push rod 151 is provided with a first linkage unlocking member 8 that can be pushed by the upper left push rod 152 when the upper left push rod 152 slides down, thereby unlocking the second left locking structure 6. The left support rod 12 is provided with a second linkage unlocking member 9 that can be pushed by the sliding sleeve when the sliding sleeve slides down, thereby unlocking the third left locking structure 7. During the specific unlocking operation, the first left locking structure 5 is unlocked first. Then, the upper left push rod 152 and the upper right push rod 252 are retracted downwards. The upper left push rod 152 pushes the first linkage unlocking component 8, thereby unlocking the second left locking structure 6. At this time, the left push rod assembly 15 and the right push rod assembly 25 can be rotated. The second left sliding component 16 and the second right sliding component 26 are pushed downwards by the left transmission rod 17 and the right transmission rod 27. During the sliding process, the second left sliding component 16 pushes the second linkage unlocking component 9, thereby unlocking the third left locking structure 7. This ensures that the first left sliding component 13 and the second right sliding component 23 can slide forward to achieve the overall folding of the stroller frame. The entire unlocking process only requires unlocking the first left locking structure 5 to unlock the second left locking structure 6 and the third left locking structure 7 in sequence, achieving linkage and making the folding operation of the stroller frame convenient and quick. For a secure lock, the locking device also includes a right locking mechanism on the right side frame 2, whose structure can be the same as the left locking mechanism.

[0041] like Figure 9 and Figure 10As shown, the first left locking structure 5 includes a first locking hole 51 on the lower left push rod 151. The upper left push rod 152 contains a first locking pin 52 that can move laterally to engage or disengage from the first locking hole 51. The upper left push rod 152 also contains a first driving block 53 that can move longitudinally within it and, when moving upwards, drives the first locking pin 52 to disengage from the first locking hole 51. The first driving block 53 and the first locking pin 52 can be in inclined contact, allowing the longitudinal movement of the first driving block 53 to be converted into the lateral movement of the first locking pin 52. This is prior art and will not be elaborated further. The upper end of the upper left push rod 152 has an exposed operating block 54 that can rotate relative to it. Between the operating block 54 and the first driving block 53 is a first pull rope 55 that can pull the first driving block 53 upwards when the operating block 54 rotates. Between the operating block 54 and the upper left push rod 152 is a first return spring 56, and between the first locking pin 52 and the upper left push rod 152 is a second return spring 57. The specific unlocking operation is as follows: Press the operation block 54. When the operation block 54 rotates, it pulls the first pull rope 55. The first pull rope 55 pulls the first drive block 53 to move upward. The first drive block 53 drives the first locking pin 52 to disengage from the first locking hole 51. At this time, the upper left push rod 152 can be retracted downward.

[0042] like Figure 11 and Figure 12As shown, the second left locking mechanism 6 includes a second locking hole 61 on the sliding sleeve, and a second locking pin 62 that can slide inside the left support rod 12 and engage or disengage with the second locking hole 61. The first linkage unlocking component 8 includes a first unlocking block 81 that can slide upward inside the left support rod 12 to disengage the second locking pin 62 from the second locking hole 61. The lower end of the left lower push rod 151 is rotatably connected to a first rotating block 82, and a first rotating block 82 is provided between the first rotating block 82 and the first unlocking block 81. When block 82 rotates, it pulls the second pull rope 83, which moves the first unlocking block 81 upward. The lower part of the lower left push rod 151 is also provided with a sliding rod 84, which can be pushed and slid by the upper left push rod 152. The lower end of the sliding rod 84 is provided with a pushing part 85, which can push the first rotating block 82 to rotate. A third return spring 86, which can push the sliding rod 84 back to its original position, is provided between the sliding rod 84 and the lower left push rod 151. A fourth return spring 63, which can push the second locking pin 62 back to its original position, is provided between the second locking pin 62 and the left support rod 12. When the upper left push rod 152 retracts downward, the lower end of the upper left push rod 152 pushes the sliding rod 84, which in turn pushes the first rotating block 82 to rotate. The first rotating block 82 then pulls the second pull rope 83, which in turn pulls the first unlocking block 81 to move. The first unlocking block 81 then causes the second locking pin 62 to disengage from the second locking hole 61, at which point the second left sliding member 16 can slide downward. The first unlocking block 81 and the second locking pin 62 can also be fitted with inclined surfaces so that the first unlocking block 81 can drive the second locking pin 62 to move.

[0043] like Figure 12 and Figure 13As shown, the third left locking structure 7 includes a locking groove 71 provided on the first left sliding member 13. A locking hook 72 that can engage or disengage from the locking groove 71 is rotatably connected to the left bottom rod 11. The second linkage unlocking member 9 includes a second rotating block 91 rotatably connected to the left support rod 12. The second rotating block 91 is provided with an outward protrusion 93 that extends outward from the left support rod 12 and can be pushed into the left support rod 12 by a downward sliding sleeve. A third pull rope 94 is provided between the second rotating block 91 and the locking hook 72, which can pull the locking hook 72 to disengage from the locking groove 71 when the sliding sleeve pushes the outward protrusion 93 to rotate the second rotating block 91. A fifth return spring 73 that can push the locking hook 72 back to its original position is provided between the locking hook 72 and the left bottom rod 11. An inclined surface 95 that can be pushed when the sliding sleeve slides upward is provided on the outward protrusion 93. When the sliding sleeve (i.e., the second left sliding member 16) slides downward, it pushes against the outward protrusion 93, causing the second rotating block 91 to rotate. During the rotation, the second rotating block 91 pulls the locking hook 72 via the third pull rope 94, causing the locking hook 72 to disengage from the locking groove 71, thus unlocking the third left locking structure 7. When the sliding sleeve slides downward, it pushes the exposed outward protrusion 93 into the left support rod 12, causing the second rotating block 91 to rotate. This allows the sliding sleeve to pass through the position on the left support rod 12 corresponding to the second rotating block 91 and reach the lower end of the left support rod 12. When the stroller frame is unfolded, the sliding sleeve slides upward and pushes against the inclined surface 95 on the second rotating block 91, causing the second rotating block 91 to rotate again. The outward protrusion 93 is then pushed into the left support rod 12, allowing the sliding sleeve to slide to the position required for the stroller frame to unfold.

[0044] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.

Claims

1. A child stroller frame capable of moving from an unfolded state to a folded state after a locking device is unlocked, comprising a frame body (100) having front wheels and rear wheels, said frame body (100) comprising a left side frame (1), a right side frame (2) and a connecting frame (3) connecting the left side frame (1) and the right side frame (2) transversely, characterized in that: The left side frame (1) includes a left bottom rod (11), and a left support rod (12) that can rotate relative to the left bottom rod (11) is provided at the rear end of the left bottom rod (11). A first left sliding member (13) that can slide along the left bottom rod (11) is provided on the left bottom rod (11). A left linkage rod (14) that is rotatably connected to the left support rod (12) is provided between the first left sliding member (13) and the middle of the left support rod (12). A left push rod assembly (15) is rotatably connected to the upper end of the left support rod (12). A second left sliding member (16) that can slide along the left support rod (12) is provided on the left support rod (12). A left transmission rod (17) that is rotatably connected to the second left sliding member (16) and the left push rod assembly (15) is provided between the second left sliding member (16) and the left push rod assembly (15). The right side frame (2) includes a right bottom rod (21), and a right support rod (22) that can rotate relative to the rear end of the right bottom rod (21). A first right sliding member (23) that can slide along the right bottom rod (21) is provided on the right bottom rod (21). A right linkage rod (24) that is rotatably connected to the right support rod (22) is provided between the first right sliding member (23) and the middle part of the right support rod (22). A right push rod assembly (25) is rotatably connected to the upper end of the right support rod (22). A second right sliding member (26) that can slide along the right support rod (22) is provided on the right support rod (22). A right transmission rod (27) that is rotatably connected to the second right sliding member (26) and the right push rod assembly (25) is provided between the second right sliding member (26) and the right push rod assembly (25).

2. The child's pushchair frame of claim 1, wherein: The front wheels include a left front wheel (18) located at the front end of the left bottom rod (11) and a right front wheel (28) located at the front end of the right bottom rod (21). The rear wheels include a left rear wheel (19) located at the rear end of the left bottom rod (11) or the lower end of the left support rod (12) and a right rear wheel (29) located at the rear end of the right bottom rod (21) or the lower end of the right support rod (22).

3. The child's buggy frame of claim 1, wherein: The connecting frame (3) includes a bottom connecting frame (31) and an upper connecting frame (32). The bottom connecting frame (31) includes a first connecting rod (315) and a second connecting rod (316) that intersect and are rotatably connected at the intersection. A first connecting head (311) is rotatably connected to the first left sliding member (13). A second connecting head (312) is rotatably connected to the lower end of the left support rod (12). A third connecting head (313) is rotatably connected to the first right sliding member (23). A fourth connecting head (314) is rotatably connected to the lower end of the right support rod (22). The front end of the first connecting rod (315) is rotatably connected to the first connecting head (311), and the rear end of the first connecting rod (315) is rotatably connected to the fourth connecting head (314). The front end of the second connecting rod (316) is rotatably connected to the third connecting head (313), and the rear end of the second connecting rod (316) is rotatably connected to the third connecting head (313). The upper connecting frame (32) is rotatably connected to the second connecting head (312); the upper connecting frame (32) includes a third connecting rod (323) and a fourth connecting rod (324) that cross each other and are rotatably connected at the cross position; a fifth connecting head (325) is rotatably connected to the second left sliding member (16); a sixth connecting head (326) is rotatably connected to the upper end of the left support rod (12); a seventh connecting head (327) is rotatably connected to the second right sliding member (26); an eighth connecting head (328) is rotatably connected to the upper end of the right support rod (22); the upper end of the third connecting rod (323) is rotatably connected to the eighth connecting head (328); the lower end of the third connecting rod (323) is rotatably connected to the fifth connecting head (325); the upper end of the fourth connecting rod (324) is rotatably connected to the sixth connecting head (326); and the lower end of the fourth connecting rod (324) is rotatably connected to the seventh connecting head (327).

4. The stroller frame according to claim 1, characterized in that: The left side frame (1) also includes a left seat rod (101), and the upper end of the left support rod (12) is rotatably connected to a left sliding sleeve (102) that allows the left seat rod (101) to slide inside. The rear end of the left seat rod (101) is provided with a left connecting part (103), and the left connecting part (103) is rotatably connected to the left transmission rod (17). The right side frame (2) also includes a right seat rod (201), and the upper end of the right support rod (22) is rotatably connected to a right sliding sleeve (202) that allows the right seat rod (201) to slide inside. The rear end of the right seat rod (201) is provided with a right connecting part (203), and the right connecting part (203) is rotatably connected to the right transmission rod (27).

5. The stroller frame according to claim 4, characterized in that: A folding frame is provided between the left seat stick (101) and the right seat stick (201). The folding frame includes a first folding rod (41) and a second folding rod (42) that cross each other and are rotatably connected at the intersection. The front end of the first folding rod (41) is rotatably connected to the front end of the right seat stick (201). A third folding rod (43) is provided between the rear end of the first folding rod (41) and the rear end of the left seat stick (101) and is rotatably connected to both. The front end of the second folding rod (42) is rotatably connected to the front end of the left seat stick (101). A fourth folding rod (44) is provided between the rear end of the second folding rod (42) and the rear end of the right seat stick (201) and is rotatably connected to both.

6. The stroller frame according to claim 1, characterized in that: The left support rod (12) includes a left rod body (121) and a left extension (122) fixed in the middle of the left rod body (121) and extending to one side thereon. The upper end of the left linkage rod (14) is rotatably connected to the left extension (122). The right support rod (22) includes a right rod body (221) and a right extension (222) fixed in the middle of the right rod body (221) and extending to one side thereon thereon. The upper end of the right linkage rod (24) is rotatably connected to the right extension (222).

7. The stroller frame according to claim 1, characterized in that: The left push rod assembly (15) includes a lower left push rod (151) rotatably connected to the upper end of the left support rod (12), and a higher left push rod (152) is slidably connected inside the lower left push rod (151); the right push rod assembly (25) includes a lower right push rod (251) rotatably connected to the upper end of the right support rod (22), and a higher right push rod (252) is slidably connected inside the lower right push rod (251).

8. The stroller frame according to claim 7, characterized in that: The lower left push rod (151) is fixedly connected to a left extension block (153) extending to one side, and the upper end of the left transmission rod (17) is rotatably connected to the left extension block (153); the lower right push rod (251) is fixedly connected to a right extension block (253) extending to one side, and the upper end of the right transmission rod (27) is rotatably connected to the right extension block (253).

9. The stroller frame according to claim 7, characterized in that: The locking device includes a left locking mechanism, which includes a first left locking structure (5) between the upper left push rod (152) and the lower left push rod (151), a second left locking structure (6) between the second left sliding member (16) and the left support rod (12), and a third left locking structure (7) between the first left sliding member (13) and the left bottom rod (11). The lower left push rod (151) is provided with a first linkage unlocking member (8) that can be pushed by the upper left push rod (152) to unlock the second left locking structure (6) when the upper left push rod (152) slides down. The second left sliding member (16) is a sliding sleeve sleeved on the left support rod (12). The left support rod (12) is provided with a second linkage unlocking member (9) that can be pushed by the sliding sleeve to unlock the third left locking structure (7) when the sliding sleeve slides down.

10. The stroller frame according to claim 9, characterized in that: The second left locking structure (6) includes a second locking hole (61) on the sliding sleeve. The left support rod (12) has a second locking pin (62) that can slide inside and engage or disengage from the second locking hole (61). The first linkage unlocking component (8) includes a first unlocking block (81) that can slide upward inside the left support rod (12) to disengage the second locking pin (62) from the second locking hole (61). The lower end of the left lower push rod (151) is rotatably connected to a first rotating block (82). The first rotating block (82) and the first... A second pull rope (83) is provided between the unlocking blocks (81) so that the first unlocking block (81) can be pulled upward when the first rotating block (82) rotates. The lower part of the left lower push rod (151) is also provided with a sliding rod (84) that can be pushed and slid by the left upper push rod (152). The lower end of the sliding rod (84) is provided with a pushing part (85) that can push the first rotating block (82) to rotate. A third return spring (86) is provided between the sliding rod (84) and the left lower push rod (151) so as to push the sliding rod (84) to return to its original position. The second locking pin (62) A fourth return spring (63) is provided between the left support rod (12) and the second locking pin (62) to push the second locking pin (62) back to its original position; the third left locking structure (7) includes a locking groove (71) provided on the first left sliding member (13), and a locking hook (72) rotatably connected to the left bottom rod (11) to engage or disengage with the locking groove (71); the second linkage unlocking member (9) includes a second rotating block (91) rotatably connected to the left support rod (12), and the second rotating block (91) is provided with a part extending outward from the left support rod (12) and capable of being pushed to its original position. The sliding sleeve pushes against the outer protrusion (93) inside the left support rod (12). A third pull rope (94) is provided between the second rotating block (91) and the locking hook (72) so that the locking hook (72) can be pulled away from the locking groove (71) when the sliding sleeve pushes against the outer protrusion (93) and the second rotating block (91) rotates. A fifth return spring (73) is provided between the locking hook (72) and the left bottom rod (11) so that the locking hook (72) can be pushed back to its original position. An inclined surface (95) is provided on the outer protrusion (93) so that it can be pushed when the sliding sleeve slides upward.

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