A child's pushchair chassis

Abstract

The present application discloses a child stroller frame, comprising a bottom support frame, a push rod assembly and a seat frame, the bottom support frame comprises a rear leg and a front leg, the push rod assembly is provided with a linkage assembly between the bottom support frame, the seat frame comprises a front frame and a rear frame, the front frame is rotatably connected with the rear frame, the front frame is provided with a front connecting rod between the linkage assembly, the rear frame comprises a support rod, the support rod is provided with an extension rod, the extension rod is rotatably connected with the rear leg, the rear leg is provided with a protruding part at the upper end, the protruding part has a first support surface and a second support surface, when the child stroller frame is in the unfolded state, the support rod is abutted on the first support surface, in the folding process of the child stroller frame, the support rod is slid on the first support surface and gradually moves to the second support surface and is slid on the second support surface, when the child stroller frame is in the folded state, the support rod is abutted on the second support surface, the front frame is further connected with a leg support frame. The present application is comfortable to ride and flexible to fold.

Description

Technical Field

[0001] This invention relates to a stroller frame. Background Technology

[0002] Strollers are common products during a child's growth. Most current strollers can be unfolded or folded; when unfolded, they provide a seat for the child, and when folded, they are easy to carry or store. For child comfort, stroller frames typically include leg supports. After attaching a fabric cover to the frame, it functions as a stroller. The fabric cover usually contains a hollow panel to further extend the leg support, providing greater support for the child's legs. For example, Chinese patent (publication number CN120606885A) discloses a stroller frame that can be unfolded or folded, with a leg support connected to the front of the seat frame. When the stroller frame is folded, the seat frame and the front of the leg support frame move closer to the lower end of the front leg. However, because the rear end of the seat frame is rotatably connected to the rear leg, the front of the leg support frame moves a large distance towards the lower end of the front leg when the stroller frame is folded. Furthermore, because the fabric cover covering the leg support frame has a hollow panel inside, this hollow panel is prone to interfering with the wheel bracket at the lower end of the front leg when folded. To solve this technical problem, the leg support frame of the stroller frame can only be shortened, which sacrifices the comfort of the child when riding.

[0003] Therefore, the present invention was developed based on the above-mentioned shortcomings. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a stroller frame that is comfortable to ride in, flexible and stable to fold, and has a small size when folded.

[0005] This invention is achieved through the following technical solution:

[0006] A stroller frame, capable of transitioning from an unfolded to a folded state after a locking device is unlocked, includes a bottom support frame. The bottom support frame includes rear legs and front legs rotatably connected to the rear legs about a first axis. Wheels are provided at the lower ends of both the front and rear legs. A push rod assembly is rotatably connected to the bottom support frame about a second axis. A linkage component is provided between the push rod assembly and the bottom support frame, which can drive the front legs to rotate towards or unfold towards the rear legs when the push rod assembly rotates towards or unfolds towards the rear legs. The stroller frame also includes a seat frame, comprising a front frame and a rear frame. The rear end of the front frame and the front end of the rear frame are rotatably connected about a third axis. A front connecting rod is provided between the front side of the front frame and the linkage component, which can drive the front frame to rotate and fold towards or unfold towards the rear legs when the front legs rotate towards or unfold towards the rear legs. The rear frame includes… When the stroller frame is unfolded, a support rod is flush with the front frame. The support rod has an extension rod extending downwards. The extension rod is rotatably connected to the rear leg around a fourth axis. The upper end of the rear leg has a protrusion protruding inwards. The protrusion has a first support surface and a second support surface located in front of the first support surface. When the stroller frame is unfolded, the support rod rests against the first support surface. During the folding process of the stroller frame, the support rod slides on the first support surface and gradually moves to the second support surface and slides on the second support surface. When the stroller frame is folded, the support rod rests against the second support surface. A leg support frame is also connected to the front frame. An adjustment mechanism is provided between the leg support frame and the front frame to adjust the position of the leg support frame.

[0007] An inclined third support surface is provided on the protrusion and located between the first support surface and the second support surface. When the stroller frame is in the unfolded state, the extension rod abuts against the third support surface. During the folding process of the stroller frame, the extension rod disengages from the third support surface.

[0008] The stroller frame has a symmetrical plane in the left-right direction, and the projections of the first support surface and the second support surface onto the symmetrical plane form a figure-eight shape.

[0009] The extension bar extends towards the rear and lower part of the stroller frame.

[0010] The push rod assembly includes a lower support rod and an upper push rod. The upper push rod is rotatably connected to the upper end of the lower support rod about the fifth axis near its lower end. The linkage assembly includes a first connecting rod. The upper end of the first connecting rod is rotatably connected to the lower end of the upper push rod about the sixth axis. The lower end of the first connecting rod is rotatably connected to the rear leg about the seventh axis. A second connecting rod and a third connecting rod are provided between the front leg and the rear leg. The rear end of the second connecting rod is rotatably connected to the front end of the third connecting rod about the eighth axis. The front end of the second connecting rod is rotatably connected to the front leg about the ninth axis. The rear end of the third connecting rod is rotatably connected to the rear leg about the tenth axis. A fourth connecting rod is provided between the first connecting rod and the third connecting rod. The upper end of the fourth connecting rod is rotatably connected to the first connecting rod about the eleventh axis. The lower end of the fourth connecting rod is rotatably connected to the third connecting rod about the twelfth axis. The upper end of the front connecting rod is rotatably connected to the front frame about the thirteenth axis. The lower end of the front connecting rod is rotatably connected to the second connecting rod about the fourteenth axis.

[0011] The second link has an upward-facing limiting groove at its rear end. When the stroller frame is in the unfolded state, the front side of the third link rests against the limiting groove.

[0012] A sliding sleeve is rotatably connected to the lower support rod around the fifteenth axis. A handrail rod that can slide inside the sliding sleeve is inserted therein. The rear end of the handrail rod is rotatably connected to the first connecting rod around the sixteenth axis. A U-shaped handrail is connected to the front end of the handrail rod.

[0013] The adjustment mechanism includes multiple slots located on the front side of the front frame. A locking rod that can engage or disengage from the slots is slidably provided inside the leg support frame. A pull rope that can pull the locking rod is connected to the locking rod. An operating block connected to the pull rope is provided on the leg support frame. A return spring that can push the locking rod to reset is also provided between the leg support frame and the locking rod.

[0014] The locking device is located between the lower support rod and the upper push rod, and the upper push rod is also connected to a canopy bracket that can be opened or closed.

[0015] The lower end of the lower support rod is rotatably connected to the upper end of the rear leg around the second axis.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The seat frame of this invention includes a front frame and a rear frame rotatably connected to the front frame. The front frame is connected to a linkage assembly via a front connecting rod, and the rear frame is rotatably connected to the rear legs via an extension rod on a support rod. Therefore, the seat frame has a two-section structure. When the stroller frame is folded, the front frame and its leg support frame move closer to the lower end of the front legs, while the rear frame rotates relative to the front frame. The rear frame extends in the thickness direction of the stroller frame in the folded state, meaning it does not move to the lower end of the front legs. In this case, the length of the leg support frame can be made longer. After a fabric cover is placed on the leg support frame, there will be no interference from the hollow board inside the fabric cover when the stroller is folded. Extending the length of the leg support frame provides better support for the child's legs. Moreover, when the stroller frame is unfolded, the front frame and the rear frame are flush with each other to form a seat support. Therefore, this invention can both extend the length of the leg support frame to ensure the child's riding comfort and allow for smooth folding, making it suitable for widespread application.

[0018] 2. In this invention, during folding, the push rod assembly rotates towards the rear leg, simultaneously causing the front leg to rotate towards the rear leg, achieving a linked folding of the bottom support frame. Simultaneously, the front connecting rod connects the front frame to the linkage assembly, allowing the front frame of the seat frame to further rotate and fold towards the front leg during the folding of the front leg. The rear frame of the seat frame is rotatably connected to the rear leg via an extension rod, and a first support surface and a second support surface are provided on the protruding part of the rear leg. During folding, the support rod smoothly transitions from the first support surface and slides to the second support surface. This design provides precise guidance and support for the rotational folding of the rear frame, ensuring a stable and reliable movement trajectory of the seat frame during folding and effectively avoiding folding jamming caused by component interference. When the stroller is in the unfolded state, the support rod of the seat frame abuts against the first support surface of the protruding part, forming a stable support structure capable of reliably supporting the weight of the child. Furthermore, the design of the front and rear frames being flush when unfolded ensures the overall strength and riding comfort of the seat frame in the unfolded state. Through a special rotating connection structure of the linkage components, front link, and rear frame, the rear legs, front legs, push rod assembly, front frame, and rear frame can all be tightly folded together. In particular, the design of the support rod abutting against the second support surface after folding further optimizes the positional relationship of each component after folding, so that the front frame and rear frame form a certain angle, reducing the thickness of the stroller frame in the folded state and ensuring that the overall size of the stroller is smaller after folding, making it easier for users to store and carry. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 This is a side view of the invention in its unfolded state;

[0021] Figure 3 This is a cross-sectional view of the invention in its unfolded state;

[0022] Figure 4 yes Figure 3 A magnified view at point W in the middle;

[0023] Figure 5 This is one of the side views during the folding process of this invention;

[0024] Figure 6 This is one of the cross-sectional views during the folding process of this invention;

[0025] Figure 7 yes Figure 6 A magnified view at point X;

[0026] Figure 8 This is the second side view during the folding process of the present invention;

[0027] Figure 9 This is the second cross-sectional view during the folding process of the present invention;

[0028] Figure 10 This is a side view of the folded state of the present invention;

[0029] Figure 11 This is a cross-sectional view of the folded state of the present invention;

[0030] Figure 12 yes Figure 11 A magnified view at point Y in the middle;

[0031] Figure 13 This is an exploded view of the present invention;

[0032] Figure 14 yes Figure 13 A magnified view at point Z;

[0033] Figure 15 This is an exploded view of the components of the present invention;

[0034] Figure 16 This is a top view of the present invention. Detailed Implementation

[0035] The present invention will now be further described with reference to the accompanying drawings:

[0036] like Figures 1 to 10As shown, the stroller frame of this embodiment can be converted from an unfolded state to a folded state after the locking device is unlocked. It includes a bottom support frame 1. The bottom support frame 1 includes a rear leg 11 and a front leg 12 rotatably connected to the rear leg 11 about a first axis A. Both the front leg 12 and the rear leg 11 are provided with wheels 13 at their lower ends. A push rod assembly 2 is rotatably connected to the bottom support frame 1 about a second axis B. A linkage assembly 3 is provided between the push rod assembly 2 and the bottom support frame 1. When the push rod assembly 2 rotates towards or unfolds the rear leg 11, it simultaneously drives the front leg 12 to rotate towards or unfold the rear leg 11, realizing the linkage between the push rod assembly 2 and the bottom support frame 1, simplifying the user's folding operation.

[0037] like Figures 1 to 11 As shown, the stroller frame also includes a seat frame 4, which comprises a front frame 41 and a rear frame 42. The rear end of the front frame 41 and the front end of the rear frame 42 are rotatably connected around a third axis C. This foldable seat structure allows the seat portion to be further folded after the entire stroller is folded, improving the compactness of the folding mechanism. A leg support frame 44 is also connected to the front frame 41, and an adjustment mechanism 45 is provided between the leg support frame 44 and the front frame 41 to adjust the position of the leg support frame 44. In this embodiment, the seat frame 4 has a two-section structure. When the stroller frame is folded, the front frame 41 and its leg support frame 44 move closer to the lower end of the front leg 12, while the rear frame 42 rotates relative to the front frame 41. The rear frame 42 does not move to the lower end of the front leg 12. In this case, the length of the leg support frame 44 can be made longer. After the fabric cover is put on the leg support frame 44, there will be no interference from the hollow board inside the fabric cover when the stroller is folded, allowing the stroller to fold smoothly. Moreover, the length of the leg support frame 44 is extended, which can provide better support for the child's legs. In addition, when the stroller frame is unfolded, the front frame 41 and the rear frame 42 are flush with each other to form a seat support with sufficient length. Therefore, the stroller frame in this embodiment can both extend the length of the leg support frame 44 to ensure the child's comfort and fold smoothly, which is a clever design.

[0038] like Figures 1 to 11As shown, a front connecting rod 43 is provided between the front side of the front frame 41 and the linkage assembly 3. This front connecting rod 43 can drive the front frame 41 to rotate and fold or unfold towards the front leg 12 when the front leg 12 rotates towards or unfolds towards the rear leg 11, thus achieving the coordinated folding of the front frame 41 and the bottom support frame 1 without additional operation, further improving ease of operation. The rear frame 42 includes a support rod 421 that is flush with the front frame 41 when the stroller frame is unfolded, providing a flat seating support surface and improving the comfort of the child. An extension rod 422 extends downwards from the support rod 421 and is rotatably connected to the rear leg 11 around the fourth axis D. The rear frame 42 is rotatably connected to the rear leg 11 via the extension rod 422. When the stroller frame is folded, the front frame 41 and the rear frame 42 rotate relative to each other, and the rear frame 42 also rotates relative to the rear leg 11, allowing the seat frame 4 to fold accordingly, achieving linkage, and resulting in a very compact folded structure.

[0039] like Figure 3 , Figure 4 , Figure 7 , Figure 12 and Figure 14 As shown, the upper end of the rear leg 11 has a protrusion 14 extending inward. The protrusion 14 has a first support surface 141 and a second support surface 142 located in front of the first support surface 141. When the stroller frame is in the unfolded state, the support rod 421 abuts against the first support surface 141, providing a stable and reliable support point for the seat frame 4 and ensuring the stability of the unfolded state. During the folding process of the stroller frame, the support rod 421 slides on the first support surface 141 and gradually moves to the second support surface 142 and slides on the second support surface 142; when the stroller frame is in the folded state, the support rod 421 abuts against the second support surface 142. This continuous sliding support provided by the protrusion 14 ensures that the rear frame 42 is effectively supported as the angle changes during the folding process relative to the rear leg 11 and the front frame 41. This guides and supports the folding movement of the rear frame 42, ensuring a smooth transition during the folding process. It also ensures that the seat frame 4 folds smoothly and smoothly during the folding of the stroller frame, and that the entire stroller folds smoothly and without jamming.

[0040] like Figure 3 , Figure 4 , Figure 7 , Figure 12 and Figure 14As shown, further, an inclined third support surface 143 is provided on the protrusion 14 and located between the first support surface 141 and the second support surface 142. When the stroller frame is in the unfolded state, the extension rod 422 abuts against the third support surface 143, and the support rod 421 abuts against the first support surface 141, forming a stable multi-faceted support structure, which improves the load-bearing rigidity of the seat frame 4 in the unfolded state and avoids swaying during riding. During the folding process of the stroller frame, the extension rod 422 disengages from the third support surface 143, thereby releasing the rotational freedom of the rear frame 42 and allowing the folding action to proceed smoothly.

[0041] like Figure 12 , Figure 14 and Figure 16 As shown, the stroller frame has a symmetrical plane SP in the left-right direction. The projections of the first support surface 141 and the second support surface 142 onto the symmetrical plane SP form a figure-eight shape. That is, when the stroller frame is unfolded, the support rod 421 abuts against the first support surface 141 and disengages from the second support surface 142. During the folding process of the stroller frame, the support rod 421 gradually moves from the first support surface 141 to the second support surface 142, thereby disengaging from the first support surface 141. This ensures that the rear frame 42 is always guided and supported as its angle changes during rotation, ensuring that the stroller frame folds smoothly and stably. In addition, the extension rod 422 extends towards the rear and lower part of the stroller frame. This inclination direction ensures that the extension rod 422 abuts against the third support surface 143 when the stroller frame is unfolded, and also ensures that the extension rod 422 is hidden inside the rear leg 11, ensuring the compactness of the stroller structure.

[0042] Regarding the specific connection method of push rod assembly 2 and linkage assembly 3, as follows: Figures 1 to 10As shown, the push rod assembly 2 includes a lower support rod 23 and an upper push rod 24. The upper push rod 24, near its lower end, is rotatably connected to the upper end of the lower support rod 23 about the fifth axis E. The lower end of the lower support rod 23 is rotatably connected to the upper end of the rear leg 11 about the second axis B. The linkage assembly 3 includes a first connecting rod 31. The upper end of the first connecting rod 31 is rotatably connected to the lower end of the upper push rod 24 about the sixth axis F, and the lower end of the first connecting rod 31 is rotatably connected to the rear leg 11 about the seventh axis G. A second connecting rod 32 and a third connecting rod 33 are provided between the front leg 12 and the rear leg 11. The rear end of the second connecting rod 32 is rotatably connected to the front end of the third connecting rod 33 about the eighth axis H, the front end of the second connecting rod 32 is rotatably connected to the front leg 12 about the ninth axis I, and the rear end of the third connecting rod 33 is rotatably connected to the rear leg 11 about the tenth axis J. A fourth link 34 is provided between the first link 31 and the third link 33. The upper end of the fourth link 34 is rotatably connected to the first link 31 around the eleventh axis K, and the lower end of the fourth link 34 is rotatably connected to the third link 33 around the twelfth axis L. The aforementioned multi-link mechanism forms a stable linkage system. When the upper push rod 24 is rotated, it folds relative to the lower support rod 23. The lower end of the upper push rod 24 drives the upper end of the first link 31 to move towards the lower end of the rear leg 11. The lower end of the first link 31 rotates relative to the rear leg 11. During this process, the first link 31 applies a downward force to the fourth link 34, which in turn pushes the third link 33 to rotate. The third link 33 then rotates and moves closer to the second link 32, causing the front leg 12 to move closer to the rear leg 11. Ultimately, the front leg 12, upper push rod 24, lower support rod 23, and first link 33 all move closer to the rear leg 11, achieving the folding of the stroller frame. The entire linkage process is smooth and flexible, ensuring the reliability of the folding operation and resulting in a compact size after folding. The upper end of the front link 43 is rotatably connected to the front frame 41 around the thirteenth axis M, and the lower end of the front link 43 is rotatably connected to the second link 32 around the fourteenth axis N. By connecting the front link 43 to the second link 32, the seat frame 4 and the front leg 12 are able to follow each other.

[0043] like Figure 1 , Figure 13 As shown, preferably, the rear end of the second link 32 is provided with an upward-facing limiting groove 35. When the stroller frame is in the unfolded state, the front side of the third link 33 abuts against the limiting groove 35. This limiting groove 35 can effectively limit the excessive rotation of the third link 33 in the unfolded state, providing a stable unfolded positioning for the front legs 12, preventing the bottom support frame 1 from accidentally folding due to accidental contact during use, and improving the safety of use.

[0044] like Figures 1 to 10As shown, the stroller frame of this embodiment also includes a handrail structure. A sliding sleeve 51 is rotatably connected to the lower support rod 23 around the fifteenth axis P. A handrail rod 52, capable of sliding within the sliding sleeve 51, is inserted inside. The rear end of the handrail rod 52 is rotatably connected to the first connecting rod 31 around the sixteenth axis Q. A U-shaped handrail 53 is connected to the front end of the handrail rod 52. During folding, as the first connecting rod 31 rotates, the handrail rod 52 can slide within the sliding sleeve 51 and fold accordingly, eliminating the need for manual disassembly and further improving the convenience of folding. Simultaneously, because the handrail rod 52 is linked to the first connecting rod 31, it can automatically position itself to a suitable height when unfolded, providing stable support for the child.

[0045] The adjustment mechanism 45 includes multiple slots 451 located on the front side of the front frame 41. A locking rod 452, capable of engaging or disengaging from the slots 451, is slidably mounted within the leg support frame 44. A pull cord 453 is connected to the locking rod 452, allowing it to slide. An operating block 454 connected to the pull cord 453 is located on the leg support frame 44. A return spring 455, capable of pushing the locking rod 452 back to its original position, is also provided between the leg support frame 44 and the locking rod 452. By operating the operating block 454, the user can pull the pull cord 453 with one hand to disengage the locking rod 452 from the slots 451, thereby adjusting the angle of the leg support frame 44 as needed. After release, the locking rod 452 automatically engages with another slot 451 under the action of the return spring 455, achieving multi-level stepless adjustment to meet the leg support needs of children of different ages. The adjustment process is simple and effortless. Of course, the adjustment mechanism 45 can also adopt a traditional adjustment structure, which will not be elaborated upon here.

[0046] In this embodiment, a locking device is located between the lower support rod 23 and the upper push rod 24. The locking device can adopt a conventional locking structure, which will not be described in detail here. An expandable or retractable canopy bracket 6 is also connected to the upper push rod 24 for installing a sunshade to provide sun protection or wind protection for children.

[0047] 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 stroller frame that can be converted from an unfolded state to a folded state after the locking device is unlocked, characterized in that: The bottom support frame (1) includes a rear leg (11) and a front leg (12) rotatably connected to the rear leg (11) about a first axis (A). Wheels (13) are provided at the lower ends of both the front leg (12) and the rear leg (11). A push rod assembly (2) is rotatably connected to the bottom support frame (1) about a second axis (B). A linkage assembly is provided between the push rod assembly (2) and the bottom support frame (1) to drive the front leg (12) to rotate towards or extend from the rear leg (11) when the push rod assembly (2) rotates towards or extends from the rear leg (11). 3) The stroller frame also includes a seat frame (4), which includes a front frame (41) and a rear frame (42). The rear end of the front frame (41) and the front end of the rear frame (42) are rotatably connected around a third axis (C). A front connecting rod (43) is provided between the front side of the front frame (41) and the linkage assembly (3) so that the front frame (41) can rotate and fold or unfold towards the front leg (12) when the front leg (12) rotates and moves closer to the rear leg (11). The rear frame (42) includes a connecting rod that can connect with the front frame when the stroller frame is unfolded. (41) A flat support rod (421) is provided with an extension rod (422) extending downwards from the support rod (421). The extension rod (422) is rotatably connected to the rear leg (11) around the fourth axis (D). The upper end of the rear leg (11) is provided with a protrusion (14) protruding inwards. The protrusion (14) has a first support surface (141) and a second support surface (142) located in front of the first support surface (141). When the stroller frame is in the unfolded state, the support rod (421) abuts against the first support surface (142). 1) During the folding process of the stroller frame, the support rod (421) slides on the first support surface (141) and gradually moves to the second support surface (142) and slides on the second support surface (142). When the stroller frame is in the folded state, the support rod (421) abuts against the second support surface (142). The front frame (41) is also connected to the leg support frame (44). An adjustment mechanism (45) that can adjust the position of the leg support frame (44) is provided between the leg support frame (44) and the front frame (41).

2. The stroller frame according to claim 1, characterized in that: An inclined third support surface (143) is provided on the protrusion (14) and located between the first support surface (141) and the second support surface (142). When the stroller frame is in the unfolded state, the extension rod (422) abuts against the third support surface (143). During the folding process of the stroller frame, the extension rod (422) disengages from the third support surface (143).

3. The stroller frame according to claim 1, characterized in that: The stroller frame has a symmetrical plane (SP) in the left-right direction, and the projections of the first support surface (141) and the second support surface (142) on the symmetrical plane (SP) form a figure-eight shape.

4. The stroller frame according to claim 1, characterized in that: The extension bar (422) extends toward the rear and lower part of the stroller frame.

5. The stroller frame according to any one of claims 1 to 4, characterized in that: The push rod assembly (2) includes a lower support rod (23) and an upper push rod (24). The upper push rod (24) is rotatably connected to the upper end of the lower support rod (23) around the fifth axis (E) at a position close to its lower end. The linkage assembly (3) includes a first connecting rod (31). The upper end of the first connecting rod (31) is rotatably connected to the lower end of the upper push rod (24) around the sixth axis (F). The lower end of the first connecting rod (31) is rotatably connected to the rear leg (11) around the seventh axis (G). A second connecting rod (32) and a third connecting rod (33) are provided between the front leg (12) and the rear leg (11). The rear end of the second connecting rod (32) is rotatably connected to the front end of the third connecting rod (33) around the eighth axis (H). The front end of the connecting rod (32) is rotatably connected to the front leg (12) around the ninth axis (I), the rear end of the third connecting rod (33) is rotatably connected to the rear leg (11) around the tenth axis (J), a fourth connecting rod (34) is provided between the first connecting rod (31) and the third connecting rod (33), the upper end of the fourth connecting rod (34) is rotatably connected to the first connecting rod (31) around the eleventh axis (K), the lower end of the fourth connecting rod (34) is rotatably connected to the third connecting rod (33) around the twelfth axis (L), the upper end of the front connecting rod (43) is rotatably connected to the front frame (41) around the thirteenth axis (M), and the lower end of the front connecting rod (43) is rotatably connected to the second connecting rod (32) around the fourteenth axis (N).

6. The stroller frame according to claim 5, characterized in that: The second link (32) has an upward-facing limiting groove (35) at its rear end. When the stroller frame is in the unfolded state, the front side of the third link (33) abuts against the limiting groove (35).

7. The stroller frame according to claim 5, characterized in that: A sliding sleeve (51) is rotatably connected to the lower support rod (23) around the fifteenth axis (P). A handrail (52) that can slide inside the sliding sleeve (51) is provided. The rear end of the handrail (52) is rotatably connected to the first connecting rod (31) around the sixteenth axis (Q). A U-shaped handrail (53) is connected to the front end of the handrail (52).

8. The stroller frame according to claim 1, characterized in that: The adjustment mechanism (45) includes multiple slots (451) located on the front side of the front frame (41). A locking rod (452) that can engage or disengage from the slots (451) is slidably provided in the leg support frame (44). A pull rope (453) that can pull the locking rod (452) is connected to the locking rod (452). An operating block (454) connected to the pull rope (453) is provided on the leg support frame (44). A reset spring (455) that can push the locking rod (452) to reset is also provided between the leg support frame (44) and the locking rod (452).

9. The stroller frame according to claim 5, characterized in that: The locking device is located between the lower support rod (23) and the upper push rod (24), and the upper push rod (24) is also connected to a canopy bracket (6) that can be unfolded or retracted.

10. The stroller frame according to claim 5, characterized in that: The lower end of the lower support rod (23) is rotatably connected to the upper end of the rear leg (11) around the second axis (B).

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