Stroller framework

Abstract

The utility model discloses a child stroller framework which comprises a bottom supporting frame, the bottom supporting frame comprises front legs and rear legs, wheels are arranged at the lower ends of the front legs and the rear legs, the positions, close to the upper ends of the rear legs, of the rear legs are rotatably connected with the front legs around a first axis, and the upper ends of the rear legs are hinged to transmission rods around a second axis. A seat supporting piece is arranged between the transmission rod and the front leg, the front side of the seat supporting piece is hinged to the upper end of the transmission rod around a third axis, the rear side of the seat supporting piece is hinged to the upper end of the front leg around a fourth axis, and the bottom supporting frame is further rotatably connected with a push rod assembly around a fifth axis. When the locking device is unlocked and the upper end of the front leg is lifted up, the push rod assembly rotates to be close to the front leg, and the connecting position of the transmission rod and the rear leg moves to the upper end of the front leg to ensure that the seat supporting piece and the rear leg also rotate to be close to the front leg. The folding chair is simple in structure and convenient to fold.

Description

Technical field

[0001] The utility model relates to a child stroller frame. [Background Technology]

[0002] Strollers are a common accessory for infants and young children as they grow. Current strollers are generally designed to be either unfolded or folded. The unfolded configuration allows children to travel, while the folded configuration allows for easy portability or storage. Strollers currently on the market vary in design, folding mechanisms, and operating principles. Therefore, the present invention provides a novel embodiment that differs from existing stroller designs. [Utility Model Content]

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a child stroller frame which has a simple structure and is easy to fold.

[0004] The utility model is realized through the following technical solutions:

[0005] A child stroller frame can be moved from an unfolded position to a folded position after a locking device is unlocked. It includes a bottom support frame, the bottom support frame including front legs and rear legs, the lower ends of the front legs and rear legs are provided with wheels, the rear legs are rotatably connected to the front legs around a first axis at and near their upper ends, the upper ends of the rear legs are hinged with a transmission rod around a second axis, a seat support is provided between the transmission rod and the front legs, the front side of the seat support is hinged to the upper end of the transmission rod around a third axis, the rear side of the seat support is hinged to the upper end of the front legs around a fourth axis, and the bottom support frame is also rotatably connected to a push rod assembly around a fifth axis. When the locking device is unlocked and the upper end of the front leg is lifted, the push rod assembly rotates and approaches the front leg, and the position where the transmission rod connects with the rear leg moves toward the upper end of the front leg to ensure that the seat support and the rear leg also rotate and approaches the front leg.

[0006] The front leg includes a first section and a second section that is bent relative to the first section and forms an L-shape with the first section. The lower end of the first section is connected to a front wheel bracket, and the front wheel bracket is connected to the wheel. The rear side of the seat support is connected to the upper end of the second section. A protrusion is provided on the first section, and the rear leg is rotatably connected to the protrusion of the front leg around the first axis.

[0007] The protrusion is arranged on the first section and close to the junction of the first section and the second section.

[0008] The seat support includes a seat plate, a lower connecting seat protruding downward is provided at the rear end of the seat plate, the lower connecting seat is rotatably connected to the upper end of the second section, an upper connecting seat protruding upward is also provided at the rear end of the seat plate, a backrest is rotatably connected to the upper connecting seat around a sixth axis, and the upper end of the transmission rod is rotatably connected to the front side of the seat plate.

[0009] The push rod assembly is rotatably connected to the upper end of the rear leg. The positions in which the push rod assembly stays include a forward position in which the stroller can be pushed forward and a reverse position in which the stroller can be pushed backward after rotating relative to the bottom support frame. When the stroller frame is in the unfolded position, a positioning mechanism is provided between the seat support and the push rod assembly to position the push rod assembly in the reverse position or the forward position.

[0010] The positioning mechanism includes a sliding block provided on the push rod assembly and capable of sliding relative to the same, the sliding block is provided with a positioning groove with an open lower end, the front side of the seat support is provided with a reverse positioning pin that can engage with the positioning groove to enable the push rod assembly to stay in the reverse position, and the rear side of the seat support is provided with a forward positioning pin that can engage with the positioning groove to enable the push rod assembly to stay in the forward position. When the push rod assembly stays in the reverse position and the upper end of the front leg is lifted to fold the stroller frame, the reverse positioning pin automatically disengages from the positioning groove, causing the push rod assembly to rotate close to the front leg under its own gravity.

[0011] A transverse tube is provided at the upper end of the front leg, and the locking device includes a rotating sleeve which is sleeved on the transverse tube and can rotate relative to the transverse tube, and a handle is provided on the rotating sleeve, and a strip hole extending along its axial direction is provided on the transverse tube, and a sliding column which can slide therein is passed through the strip hole, and an inclined hole is provided on the rotating sleeve for the sliding column to pass through and can drive the sliding column to slide in the strip hole when the rotating sleeve rotates, and the sliding column is connected to a first pull rope which is passed through the front leg, and the end of the first pull rope is connected to a locking block which can slide in the front leg, and the rear leg is provided with a locking groove which can engage or disengage with the locking block, and a first reset spring which can push the locking block to reset is also provided between the locking block and the front leg.

[0012] The backrest includes a U-shaped backrest tube and a backrest seat arranged at the lower end of the backrest tube, the backrest seat is rotatably connected to the upper connecting seat, a sliding seat that can slide relative to the backrest seat is provided in the backrest seat, a horizontal protrusion is provided on the sliding seat, and the upper connecting seat is provided with a snapping groove that can engage with the protrusion. The upper connecting seat is also provided with a first arc groove that is communicated with the snapping groove and can allow the protrusion to slide inside after the protrusion withdraws from the snapping groove. A wrench that can rotate relative to the backrest tube is provided at the upper end of the backrest tube, a second pull rope that can pull the sliding seat to slide when the wrench is pulled is provided between the wrench and the sliding seat, and a second return spring that can push the sliding seat to return to its original position is also provided between the sliding seat and the backrest seat.

[0013] The backrest tube is provided with a slider that can slide horizontally therein, the slider is connected to the second pull rope, the slider is provided with a first arc surface, the wrench is provided with a second arc surface that can push the first arc surface to make the slider slide when it rotates, and the backrest tube is also provided with a sliding piece that can slide longitudinally therein, the position where the sliding piece stays includes a locking position and an unlocking position that stops after sliding downward. When the sliding piece stays in the locking position, the sliding piece can prevent the slider from sliding, and when the sliding piece stays in the unlocking position, the sliding piece makes way for the horizontal sliding of the slider, the sliding piece is connected to an operating button exposed to the backrest tube and can push the sliding piece to slide downward when sliding, and the backrest tube is also provided with a third return spring that can push the sliding piece to return to its original position.

[0014] The upper connecting seat can also be rotatably connected to a front armrest, which includes an armrest rod and an armrest seat. The armrest seat is provided with a second arc groove, and the backrest seat is provided with an arc convex strip that is inserted into the second arc groove and can push the front armrest to fold or unfold.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. When the stroller frame of the present invention is folded, the locking device is first unlocked, and then the upper ends of the front legs are lifted upward, and the push rod assembly rotates relative to the bottom support frame and approaches the front legs. Under the action of the gravity of the front legs and the rear legs, the front legs and the rear legs rotate relative to each other and approach each other, and the position where the rear legs are connected to the transmission rod moves toward the upper ends of the front legs, thereby pulling the seat support to rotate and approach the front legs through the transmission rod. At this point, the stroller frame is folded. The folding operation is very convenient and quick, and only the locking device needs to be unlocked and the upper ends of the front legs need to be lifted. In addition, the entire stroller frame structure is relatively simple.

[0017] 2. The push rod assembly of the present invention can rotate relative to the bottom support frame and remain in either a forward or reverse position. When the push rod assembly is in the forward position, the child in the seat support faces forward when an adult pushes the stroller. When the push rod assembly is in the reverse position, the child faces rearward and faces the adult, making it easier for the adult to supervise the child. Therefore, the adult can choose how to supervise the child according to their needs. Furthermore, when the push rod assembly is in the reverse position, the locking device is unlocked and the upper end of the front leg is lifted, and the reverse positioning pin on the seat support automatically disengages from the positioning slot on the push rod assembly, allowing the push rod assembly to rotate and fold under its own weight, making the stroller frame easy and smooth to fold.

[0018] 3. The utility model has a simple structure and is easy to fold and operate. The push rod assembly can be pushed forward and backward, and is suitable for promotion and application.

Brief Description of the Drawings

[0019] Figure 1It is a three-dimensional diagram of the utility model;

[0020] Figure 2 It is a side view of the push rod assembly of the utility model when it is in the forward position;

[0021] Figure 3 It is a side view of the push rod assembly of the utility model when it is in the reverse position;

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

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

[0024] Figure 6 This is a side view of the utility model in a folded state;

[0025] Figure 7 It is a side view of the components of the utility model;

[0026] Figure 8 This is one of the exploded views of the components of the present utility model;

[0027] Figure 9 It is one of the three-dimensional diagrams of the components of the utility model;

[0028] Figure 10 This is the second exploded view of the components of the present utility model;

[0029] Figure 11 This is the second perspective view of the components of the present utility model;

[0030] Figure 12 This is the third exploded view of the components of the present utility model;

[0031] Figure 13 This is the fourth exploded view of the components of the present utility model;

[0032] Figure 14 This is the third stereogram of the components of the present invention. [Specific implementation method]

[0033] The present invention will be further described below with reference to the accompanying drawings:

[0034] like Figure 1 and Figure 8 The stroller frame has an unfolded state (expanded position) and a folded state (folded position), and can be moved from the unfolded state to the folded state after a locking device is unlocked. In the unfolded state, the stroller is suitable for children to travel, and in the folded state, the stroller is easy to carry or store.

[0035] like Figures 1 to 8As shown, the frame of the child stroller includes a bottom support frame 1, which includes a front leg 11 and a rear leg 12. The lower ends of the front legs 11 and the rear legs 12 are provided with wheels 13. The rear legs 12 are rotatably connected to the front legs 11 around a first axis A near their upper ends. The upper ends of the rear legs 12 are hinged with a transmission rod 14 around a second axis B. A seat support 15 is provided between the transmission rod 14 and the front legs 11. The front side of the seat support 15 is hinged to the upper end of the transmission rod 14 around a third axis C, and the rear side of the seat support 15 is hinged to the upper end of the front legs 11 around a fourth axis D. The bottom support frame 1 is also rotatably connected to a push rod assembly 2 around a fifth axis E. When the locking device is unlocked and the upper end of the front leg 11 is lifted, the push rod assembly 2 rotates close to the front leg 11, and the position where the transmission rod 14 connects with the rear leg 12 moves toward the upper end of the front leg 11 to ensure that the seat support 15 and the rear leg 12 also rotate close to the front leg 11. When folding the stroller frame, the locking device is first unlocked. Then, the upper end of the front leg 11 is lifted upward, causing the push rod assembly 2 to rotate relative to the bottom support frame 1 and approach the front leg 11. Under the action of gravity, the front and rear legs 11, 12, rotate relative to each other and move toward the upper end of the front leg 11. The rear leg 12 rotates relative to the connection point with the transmission rod 14 and moves toward the upper end of the front leg 11. This pulls the seat support 15, pulled by the transmission rod 14, to rotate toward the front leg 11. This completes the folding of the stroller frame. The folding operation is very convenient and quick, requiring only unlocking the locking device and lifting the upper end of the front leg 11. Furthermore, the entire stroller frame structure is relatively simple. The locking device can employ a locking mechanism commonly used in conventional strollers, such as a protruding shaft or hook provided on two components in a relative rotational relationship. However, in this embodiment, a novel locking device is employed to facilitate the folding of the stroller frame. The specific structure is described in detail below.

[0036] like Figures 1 to 5 As shown, the push rod assembly 2 is rotatably connected to the upper end of the rear leg 12. Of course, the push rod assembly 2 can also be connected to the seat support 15. However, compared to directly connecting the push rod assembly 2 to the seat support 15, in this embodiment, connecting the lower end of the push rod assembly 2 below the seat support 15 can make the child stroller more stable and safer to push.

[0037] like Figures 1 to 5As shown, the push rod assembly 2 can be positioned in two positions: a forward position, enabling forward propulsion of the stroller, and a reverse position, enabling rearward propulsion of the stroller after rotation relative to the base support frame 1. When the stroller frame is in the expanded position, a positioning mechanism is provided between the seat support 15 and the push rod assembly 2, capable of positioning the push rod assembly 2 in either the reverse or forward position. When the push rod assembly 2 is in the forward position, the child within the seat support 15 faces forward while an adult pushes the stroller. When the push rod assembly 2 is in the reverse position, the child faces rearward and faces the adult, making it easier for the adult to supervise the child. Therefore, adults can choose how to care for their children based on their needs.

[0038] like Figures 2 to 4 as well as Figure 14 As shown, the push rod assembly 2 includes a lower push rod 21 rotatably connected to the upper end of the rear leg 12 and an upper push rod 22 that can be telescoped within the lower push rod 21 .

[0039] like Figure 4 、 Figure 5 、 Figure 12 and Figure 14As shown, the positioning mechanism includes a sliding block 41 provided on the push rod assembly 2 and capable of sliding relative thereto, the sliding block 41 is provided with a positioning groove 42 with an opening at the lower end, the front side of the seat support 15 is provided with a reverse positioning pin 43 which can engage with the positioning groove 42 to allow the push rod assembly 2 to stay in the reverse position, the rear side of the seat support 15 is provided with a forward positioning pin 44 which can engage with the positioning groove 42 to allow the push rod assembly 2 to stay in the forward position, the outer side of the lower push rod 21 is provided with a sliding sleeve 91, and a third pull rope (not shown in the figure) is provided between the sliding sleeve 91 and the sliding block 41 to pull the sliding block 41 to slide. When the position of the push rod assembly 2 needs to be adjusted, the sliding sleeve 91 is simply pulled to slide. The sliding sleeve 91 then slides the sliding block 41 via the third pull rope, causing the positioning groove 42 to disengage from the reverse positioning pin 43 or the forward positioning pin 44. Once disengaged, the position of the push rod assembly 2 can be rotated to adjust. When the desired position is reached, the positioning groove 42 is again engaged with the forward positioning pin 44 or the reverse positioning pin 43. When the push rod assembly 2 is in the forward position and needs to be folded, the sliding sleeve 91 can be pulled to disengage the positioning groove 42 from the forward positioning pin 44, and then the push rod assembly 2 can be rotated. When the push rod assembly 2 is in the reverse position and needs to be folded, since the positioning groove 42 is an open groove with an opening at the lower end, when the locking device is unlocked and the upper end of the front leg 11 is lifted, the seat support 15 rotates relative to the upper end of the front leg 11. At this time, the reverse positioning pin 43 will automatically withdraw from the positioning groove 42, so that the push rod assembly 2 can rotate relative to the rear leg 12 and move closer to the front leg 11 under the action of its own gravity. That is, when the push rod assembly 2 stays in the reverse position and the upper end of the front leg 11 is lifted to fold the child stroller frame, the reverse positioning pin 43 automatically disengages from the positioning groove 42, so that the push rod assembly 2 rotates and moves closer to the front leg 11 under its own gravity. Therefore, when the push rod assembly 2 stays in the reverse position, the child stroller frame can be folded without unlocking the push rod assembly 2 separately, making the folding operation convenient and quick.

[0040] like Figures 2 to 7 As shown, the front leg 11 includes a first section 111 and a second section 112 that bends relative to the first section 111 to form an L-shape with the first section 111. The lower end of the first section 111 is connected to the front wheel bracket 16, to which the wheel 13 is connected. The rear side of the seat support 15 is connected to the upper end of the second section 112. The first section 111 is provided with a protrusion 113. The rear leg 12 is rotatably connected to the protrusion 113 of the front leg 11 about the first axis A. The protrusion 113 is provided on the first section 111 near the junction of the first section 111 and the second section 112. The overall L-shape of the front leg 11 ensures that the seat support 15, the rear leg 12, and the transmission rod 14 are connected at the appropriate points, ensuring a simple and compact structure for the stroller frame and flexible folding and stowing.

[0041] like Figure 4 、 Figure 8 and Figure 12 As shown, a transverse tube 17 is provided at the upper end of the front leg 11, and the locking device includes a rotating sleeve 51 which is sleeved on the transverse tube 17 and can rotate relative to it, and a handle 52 is provided on the rotating sleeve 51, and a bar-shaped hole 53 extending along its axial direction is provided on the transverse tube 17, and a sliding column 54 which can slide therein is passed through the bar-shaped hole 53, and an inclined hole 55 is provided on the rotating sleeve 51 for the sliding column 54 to penetrate and drive the sliding column 54 to slide in the bar hole 53 when the rotating sleeve 51 rotates, and the sliding column 54 is connected to a first pull rope 56 which is passed through the front leg 11, and the end of the first pull rope 56 is connected to a locking block 57 which can slide in the front leg 11, and the rear leg 12 is provided with a locking groove 58 which can engage or disengage with the locking block 57, and a first return spring 59 which can push the locking block 57 to return to its original position is also provided between the locking block 57 and the front leg 11. Simply grip the handle 52 and lift it, and the rotating sleeve 51 rotates. The inclined hole 55 on the rotating sleeve 51 pushes the sliding post 54 to slide within the strip hole 53. The sliding post 54 then pulls the first pull rope 56, thereby disengaging the locking block 57 from the locking groove 58. Once disengaged, the locking device is unlocked. Therefore, in this embodiment, the locking device is unlocked simultaneously with lifting the upper end of the front leg 11. The locking device is unlocked during the lifting process, making the stroller frame more convenient and quick to fold.

[0042] like Figures 1 to 7 As shown, the seat support 15 includes a seat plate 151, and a lower connecting seat 152 protruding downward is provided at the rear end of the seat plate 151. The lower connecting seat 152 is rotatably connected to the upper end of the second section 112. The rear end of the seat plate 151 is also provided with an upper connecting seat 153 protruding upward. The upper connecting seat 153 is rotatably connected to the backrest 3 around the sixth axis F, and the upper end of the transmission rod 14 is rotatably connected to the front side of the seat plate 151.

[0043] like Figures 8 to 12As shown, the backrest 3 includes a U-shaped backrest tube 31 and a backrest seat 32 provided at the lower end of the backrest tube 31, the backrest seat 32 is rotatably connected to the upper connecting seat 153, and a sliding seat 61 is provided in the backrest seat 32 that can slide relative to it, and a horizontal protrusion 62 is provided on the sliding seat 61, and the upper connecting seat 153 is provided with a snap-fitting groove 63 that can engage with the protrusion 62, and the upper connecting seat 153 is also provided with a first arc groove 64 that communicates with the snap-fitting groove 63 and can allow the protrusion 62 to slide inside after the protrusion 62 withdraws from the snap-fitting groove 63, and the upper end of the backrest tube 31 is provided with a wrench 65 that can rotate relative to it, and a second pull rope 66 is provided between the wrench 65 and the sliding seat 61, which can pull the sliding seat 61 to slide when the wrench 65 is pulled, and a second return spring 67 that can push the sliding seat 61 to return to its original position is also provided between the sliding seat 61 and the backrest seat 32. By turning the lever 65, the second pull cord 66 is pulled, and the second pull cord 66 pulls the sliding seat 61, causing the protrusion 62 on the sliding seat 61 to exit the engaging groove 63 and enter the first arcuate groove 65. At this time, the backrest 3 can be rotated and folded relative to the seat plate 151. To fold the stroller frame, the push rod assembly 2 can be rotated to the reverse position and the upper push rod 22 can be retracted. Then, the backrest 3 can be folded onto the seat support 15, and the upper end of the front leg 11 can be lifted upward.

[0044] like Figures 8 to 11As shown, the backrest tube 31 is provided with a slider 68 that can slide horizontally therein, and the slider 68 is connected to the second pull rope 66. The slider 68 is provided with a first arc surface 69, and the wrench 65 is provided with a second arc surface 60 that can push the first arc surface 69 to slide the slider 68 when it rotates. The backrest tube 31 is also provided with a sliding piece 71 that can slide longitudinally therein, and the position where the sliding piece 71 stays includes a locking position and an unlocking position where it stays after sliding downward. When the sliding piece 71 stays in the locking position, the sliding piece 71 can block the sliding of the slider 68. When the sliding piece 71 stays in the unlocking position, the sliding piece 71 makes way for the horizontal sliding of the slider 68. The sliding piece 71 is connected to an operating button 72 exposed to the backrest tube 31 and can push the sliding piece 71 to slide downward when sliding. The backrest tube 31 is also provided with a third return spring 73 that can push the sliding piece 71 to return to its original position. The sliding piece 71 acts as a double lock. When the sliding piece 71 is in the locked position, the slider 68 cannot slide or the sliding stroke is insufficient to pull the protrusion 62 out of the engaging groove 63 due to the obstruction of the sliding piece 71. Therefore, even if the wrench 65 is turned, the backrest 3 cannot be folded, preventing misoperation and ensuring safety. When the operating button 72 is pushed, the operating button 72 pushes the sliding piece 71 to the unlocked position. At this time, the sliding piece 71 makes room for the slider 68. At this time, when the wrench 65 is pulled, the second curved surface 60 pushes the first curved surface 69, and the sliding seat 61 is pulled by the slider 68 to slide, and the protrusion 62 is disengaged from the engaging groove 63.

[0045] like Figure 1 and Figure 12 、 Figure 13 As shown, the upper connecting seat 153 is also rotatably connected to the front armrest 8. The front armrest 8 includes an armrest rod 81 and an armrest seat 82. The armrest seat 82 is provided with a second arcuate groove 83. The backrest seat 32 is provided with an arcuate protrusion 84 that inserts into the second arcuate groove 83 and can push the front armrest 8 to fold or unfold. When the backrest seat 32 rotates, the arcuate protrusion 84 can push the end of the second arcuate groove 83, thereby realizing that when the backrest 3 rotates to unfold or fold, it also pushes the front armrest 8 to unfold or fold, realizing linkage.

[0046] The embodiment is described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiment. Various changes can be made within the knowledge of ordinary technicians in the technical field without departing from the present invention.

Claims

1. A child stroller frame capable of moving from an unfolded position to a folded position after a locking device is unlocked, characterized in that: The invention comprises a bottom support frame (1), wherein the bottom support frame (1) comprises a front leg (11) and a rear leg (12), wherein wheels (13) are provided at the lower ends of the front leg (11) and the rear leg (12), wherein the rear leg (12) is rotatably connected to the front leg (11) around a first axis (A) at a position close to the upper end thereof, wherein the upper end of the rear leg (12) is hinged with a transmission rod (14) around a second axis (B), wherein a seat support member (15) is provided between the transmission rod (14) and the front leg (11), wherein the front side of the seat support member (15) is connected to the upper end of the transmission rod (14), wherein the seat support member (15) is connected to the upper end of the transmission rod (14) and the seat support member (15). The end is hinged around a third axis (C), the rear side of the seat support (15) is hinged to the upper end of the front leg (11) around a fourth axis (D), and the bottom support frame (1) is also rotatably connected to a push rod assembly (2) around a fifth axis (E). When the locking device is unlocked and the upper end of the front leg (11) is lifted, the push rod assembly (2) rotates and approaches the front leg (11), and the transmission rod (14) moves from the connection position with the rear leg (12) to the upper end of the front leg (11) to ensure that the seat support (15) and the rear leg (12) also rotate and approach the front leg (11).

2. The stroller frame according to claim 1, characterized in that: The front leg (11) includes a first section (111) and a second section (112) bent relative to the first section (111) to form an L-shape with the first section (111); the lower end of the first section (111) is connected to a front wheel bracket (16); the front wheel bracket (16) is connected to the wheel (13); the rear side of the seat support (15) is connected to the upper end of the second section (112); the first section (111) is provided with a protrusion (113); the rear leg (12) is rotatably connected to the protrusion (113) of the front leg (11) around the first axis (A).

3. The stroller frame according to claim 2, characterized in that: The protruding portion (113) is arranged on the first section (111) and close to the junction of the first section (111) and the second section (112).

4. The stroller frame according to claim 2, characterized in that: The seat support member (15) includes a seat plate (151), a lower connecting seat (152) protruding downward is provided at the rear end of the seat plate (151), and the lower connecting seat (152) is rotatably connected to the upper end of the second section (112). The rear end of the seat plate (151) is also provided with an upper connecting seat (153) protruding upward, and the upper connecting seat (153) is rotatably connected to a backrest (3) around a sixth axis (F). The upper end of the transmission rod (14) is rotatably connected to the front side of the seat plate (151).

5. The stroller frame according to claim 2, characterized in that: The push rod assembly (2) is rotatably connected to the upper end of the rear leg (12). The positions where the push rod assembly (2) stays include a forward position capable of pushing the stroller forward and a reverse position capable of pushing the stroller backward after rotating relative to the bottom support frame (1). When the stroller frame is in the unfolded position, a positioning mechanism is provided between the seat support (15) and the push rod assembly (2) that can position the push rod assembly (2) in the reverse position or the forward position.

6. The stroller frame according to claim 5, characterized in that: The positioning mechanism includes a sliding block (41) provided on the push rod assembly (2) and capable of sliding relative thereto, a positioning groove (42) with an opening at the lower end provided on the sliding block (41), a reverse positioning pin (43) capable of engaging with the positioning groove (42) to allow the push rod assembly (2) to stay in the reverse position on the front side of the seat support (15), and a forward positioning pin (44) capable of engaging with the positioning groove (42) to allow the push rod assembly (2) to stay in the forward position on the rear side of the seat support (15). When the push rod assembly (2) stays in the reverse position and the upper end of the front leg (11) is lifted to fold the child stroller frame, the reverse positioning pin (43) automatically disengages from the positioning groove (42) so that the push rod assembly (2) rotates close to the front leg (11) under its own weight.

7. The child stroller frame according to any one of claims 1 to 5, characterized in that: The upper end of the front leg (11) is provided with a transverse tube (17), the locking device includes a rotating sleeve (51) which is sleeved on the transverse tube (17) and can rotate relative to the transverse tube, the rotating sleeve (51) is provided with a handle (52), the transverse tube (17) is provided with a strip hole (53) extending along its axial direction, the strip hole (53) is penetrated by a sliding column (54) which can slide therein, the rotating sleeve (51) is provided with a sliding column (54) for the sliding column (54) to penetrate and can drive the sliding column when the rotating sleeve (51) rotates. (54) An inclined hole (55) sliding in the bar hole (53), the sliding column (54) is connected to a first pull rope (56) passing through the front leg (11), the end of the first pull rope (56) is connected to a locking block (57) that can slide in the front leg (11), the rear leg (12) is provided with a locking groove (58) that can engage with or disengage from the locking block (57), and a first reset spring (59) that can push the locking block (57) to reset is also provided between the locking block (57) and the front leg (11).

8. The stroller frame according to claim 4, characterized in that: The backrest (3) comprises a U-shaped backrest tube (31) and a backrest seat (32) provided at the lower end of the backrest tube (31), the backrest seat (32) is rotatably connected to the upper connecting seat (153), a sliding seat (61) is provided in the backrest seat (32) and can slide relative to the backrest seat, the sliding seat (61) is provided with a transverse protrusion (62), the upper connecting seat (153) is provided with a snap-fitting groove (63) that can snap-fit ​​with the protrusion (62), and the upper connecting seat (153) is also provided with a snap-fitting groove (63) that can snap-fit ​​with the protrusion (62). 3) a first arc-shaped groove (64) which is in communication with the backrest tube (31) and can allow the protrusion (62) to slide therein after the protrusion (62) withdraws from the engaging groove (63); a wrench (65) which can rotate relative to the backrest tube (31) is provided at the upper end; a second pull rope (66) which can pull the sliding seat (61) to slide when the wrench (65) is turned is provided between the sliding seat (61); and a second return spring (67) which can push the sliding seat (61) to return to its original position is also provided between the sliding seat (61) and the backrest seat (32).

9. The stroller frame according to claim 8, characterized in that: The backrest tube (31) is provided with a slider (68) capable of sliding transversely therein, the slider (68) is connected to the second pull rope (66), the slider (68) is provided with a first arc surface (69), the wrench (65) is provided with a second arc surface (60) capable of pushing the first arc surface (69) to slide the slider (68) when the wrench (65) rotates, and the backrest tube (31) is also provided with a sliding piece (71) capable of sliding longitudinally therein, and the position where the sliding piece (71) stays includes a locking position and a stop position after sliding downward. When the sliding piece (71) stays in the locked position, the sliding piece (71) can prevent the slider (68) from sliding. When the sliding piece (71) stays in the unlocked position, the sliding piece (71) is a position for the slider (68) to slide laterally. The sliding piece (71) is connected to an operating button (72) exposed on the backrest tube (31) and capable of pushing the sliding piece (71) to slide downward when sliding. A third reset spring (73) capable of pushing the sliding piece (71) to return to its original position is also provided in the backrest tube (31).

10. The stroller frame according to claim 8, characterized in that: The upper connecting seat (153) can also be rotatably connected to a front armrest (8), the front armrest (8) comprising an armrest rod (81) and an armrest seat (82), the armrest seat (82) being provided with a second arcuate groove (83), and the backrest seat (32) being provided with an arcuate ridge (84) which is inserted into the second arcuate groove (83) and can push the front armrest (8) to fold or unfold.

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