Stroller framework

Abstract

A bottom supporting frame comprises front legs and rear legs rotationally connected with the front legs, wheels are arranged at the lower ends of the front legs and the lower ends of the rear legs, a supporting rod is rotationally connected to the upper end of the bottom supporting frame, and the position, close to the lower end of the hand pushing rod, of the hand pushing rod is rotationally connected with the upper end of the supporting rod. A traction assembly is arranged between the front leg and the rear leg, and the traction assembly can draw the front leg and the rear leg to be close to each other or unfold when the front leg and the rear leg move relative to each other. A linkage rod which is hinged to the transmission rod and the traction assembly and can drive the traction assembly to move when the transmission rod is rotationally folded or unfolded relative to the rear legs is arranged on the transmission rod and between the position, close to the lower end of the transmission rod, and the rear side of the seat frame is rotationally connected with the upper ends of the rear legs. And a connecting rod which is hinged with the seat frame and the traction assembly and can drive the seat frame to close or unfold relative to the front legs when the traction assembly drives the front legs and the rear legs to close or unfold is arranged between the front side of the seat frame and the traction assembly. The folding chair is simple in structure and flexible to fold.

Description

Technical field

[0001] The invention relates to a children's stroller frame. [Background Technology]

[0002] With the development of society, strollers have become an essential travel tool for infants and young children. Beyond the basic requirements of safety and stability, parents increasingly prioritize features such as foldability, compact size, and easy storage. Consequently, strollers currently generally feature foldable features, allowing them to unfold when in use and fold when not in use for easier portability and reduced space requirements. Furthermore, the variety of strollers on the market varies, with varying folding mechanisms.

[0003] The present invention provides a new embodiment that is different from the prior art. [Summary of the invention]

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a child stroller frame with a simple structure and flexible folding.

[0005] The present invention is achieved through the following technical solutions:

[0006] The stroller frame can be moved from the unfolded position to the folded position after the locking device is unlocked, and includes a bottom support frame, the bottom support frame includes front legs and rear legs rotatably connected to the front legs around a first axis, the lower ends of the front legs and the rear legs are provided with wheels, the upper end of the bottom support frame is rotatably connected to the support rod around a second axis, the stroller frame also includes a hand push rod, the hand push rod is rotatably connected to the upper end of the support rod around a third axis near its lower end, a transmission rod is provided between the lower end of the hand push rod and the rear legs, and a transmission rod is provided between the front legs and the rear legs. There is a traction component that can pull the two legs together or unfold when they move relative to each other. A linkage rod is provided on the transmission rod and near its lower end position and between the traction component, which is hinged to the two legs and can drive the traction component to move when the transmission rod rotates relative to the rear legs to fold or unfold. The child stroller frame also includes a seat frame, the rear side of the seat frame is rotatably connected to the upper end of the rear legs around a fourth axis, and a connecting rod is provided between the front side of the seat frame and the traction component, which is hinged to the two legs and can drive the seat frame to move closer to or unfold relative to the front legs when the traction component drives the front legs and rear legs to move closer to or unfold.

[0007] The traction assembly includes a first traction rod and a second traction rod, the front end of the first traction rod is rotatably connected to the front leg around a fifth axis, the rear end of the first traction rod is rotatably connected to the front end of the second traction rod around a sixth axis, the rear end of the second traction rod is rotatably connected to the rear leg around a seventh axis, the upper end of the linkage rod is rotatably connected to the transmission rod around an eighth axis, the lower end of the linkage rod is rotatably connected to the second traction rod around a ninth axis, the upper end of the connecting rod is rotatably connected to the seat frame around a tenth axis, and the lower end of the connecting rod is rotatably connected to the first traction rod around an eleventh axis.

[0008] The hind legs include hind leg rods, the upper ends of the hind leg rods are fixedly connected to a connecting seat, the front legs are rotatably connected to one side of the connecting seat, and the support rods are rotatably connected to the other side of the connecting seat.

[0009] The stroller frame also includes a U-shaped handrail rod, a connecting sleeve is rotatably connected to the support rod around the twelfth axis, the handrail rod is inserted into the connecting sleeve and can slide back and forth, and the rear end of the handrail rod is rotatably connected to the transmission rod around the thirteenth axis.

[0010] The upper end of the transmission rod is hinged to the lower end of the push rod around the fourteenth axis, and the lower end of the transmission rod is hinged to the rear leg around the fifteenth axis.

[0011] The front end of the seat frame is rotatably connected to the leg support frame, and an adjustment structure that can adjust the rest position of the leg support frame is provided between the leg support frame and the seat frame. The adjustment structure includes a plurality of first engaging grooves provided on the seat frame along the circumferential direction, and a plurality of second engaging grooves are provided on the leg support frame along the circumferential direction. A gear that can move laterally therein and can engage with the first engaging groove and the second engaging groove at the same time is provided in the space enclosed by the docking of the seat frame and the leg support frame. An operating component that can pull the gear out of the first engaging groove is provided on the leg support frame, and a first return spring that can push the gear to move and return is also provided between the gear and the leg support frame.

[0012] The leg support frame is provided with a fixed seat, and the operating component includes an operating block provided on the fixed seat and capable of sliding relative to the fixed seat. A first pull rope is provided between the operating block and the gear, which can pull the gear out of the first engaging groove when the operating block slides. A second return spring is provided between the operating block and the fixed seat, which can push the operating block to slide and return to its original position.

[0013] The fixing seat is provided with a guide groove, and the operating block is provided with a guide column inserted into the guide groove.

[0014] The locking device includes a first connecting shell arranged on the hand push rod, a plurality of first slots are provided on the first connecting shell along the circumferential direction, a second connecting shell is provided on the upper end of the support rod, and a plurality of second slots are provided on the second connecting shell along the circumferential direction, a spline is provided in the space enclosed by the first connecting shell and the second connecting shell, which can slide therein and engage with the first slot and the second slot at the same time, a movable block is provided between the spline and the first connecting shell, which can push the spline to disengage from the first slot when rotating, an operating member is provided at the upper end of the hand push rod, a second pull rope is provided between the operating member and the movable block, and a third reset spring is provided between the spline and the second connecting shell, which can push the spline to move and reset.

[0015] The first connecting shell is provided with a plurality of oblique protrusions along the circumferential direction, and the movable block is provided with oblique grooves matched with the oblique protrusions.

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

[0017] 1. When folding, the push rod rotates forward relative to the support rod, causing the lower end of the support rod to rotate relative to the bottom support frame. The lower end of the push rod moves downward and rotates relative to the transmission rod, which in turn rotates relative to the rear legs. During this process, the linkage rod pushes the traction assembly to move, which pulls the front and rear legs toward each other, causing them to rotate relative to each other and move closer. Furthermore, the traction assembly, through the connecting rod, pulls the seat frame relative to the rear legs and toward the front legs, thereby folding the stroller frame. The entire stroller frame has a simple structure, is easy to fold, and is flexible to collapse.

[0018] 2. During the folding process of the present invention, as the transmission rod rotates relative to the rear legs and moves toward them, the transmission rod pushes the linkage rod, which in turn pushes the second traction rod to rotate downward relative to the rear legs. The second traction rod then drives the first traction rod to rotate relative to the front legs, and the connection point between the first and second traction rods moves downward, thereby pulling the front and rear legs together. As the first traction rod rotates downward relative to the front legs, the first traction rod further pulls the connecting rod downward, which in turn pulls the front side of the seat frame, causing the rear side of the seat frame to rotate relative to the rear legs, thereby folding the seat frame. The entire linkage mechanism is cleverly designed, allowing the stroller frame to fold flexibly.

[0019] 3. The support rod of the present invention is rotatably connected to a connecting sleeve, and the handrail rod is inserted into the connecting sleeve and can slide in the connecting sleeve, and the rear end of the handrail rod is rotatably connected to the transmission rod. Therefore, when the transmission rod is rotated and folded relative to the rear leg, the transmission rod pulls the handrail rod to slide in the connecting sleeve and causes the connecting sleeve to rotate relative to the support rod. Finally, the handrail rod moves backward and approaches the support rod, so that when the child stroller frame is in the unfolded state, the handrail rod can extend forward longer for the child to grasp. When the child stroller is folded, the handrail rod moves backward without protruding too far forward, thereby reducing the volume after folding and reducing the occupied space.

[0020] 4. When folding, the present invention rotates the push rod forward, allowing the various components to rotate relative to each other under the action of gravity on the push rod and the support rod, thereby achieving automatic folding. That is, once the unlocking device is unlocked and the push rod is slightly rotated relative to each other, even if the push rod is released, the stroller frame automatically moves to the folded position, which is very convenient and quick. Moreover, in the folded position, the lower end of the push rod and the wheels form a support point on the ground, allowing the folded stroller frame to remain upright for easy storage.

Brief Description of the Drawings

[0021] Figure 1 It is a stereogram of the present invention;

[0022] Figure 2 This is a side view of the present invention in an expanded state;

[0023] Figure 3 This is one of the side views of the present invention during the folding process;

[0024] Figure 4 This is the second side view of the present invention during the folding process;

[0025] Figure 5 This is the third side view of the present invention during the folding process;

[0026] Figure 6 This is a side view of the present invention in a folded state;

[0027] Figure 7 It is one of the exploded views of the present invention;

[0028] Figure 8 This is the second exploded view of the components of the present invention;

[0029] Figure 9 It is the third exploded view of the components of the present invention. [Specific implementation method]

[0030] The present invention will be further described below in conjunction with the accompanying drawings:

[0031] like Figures 1 to 6As shown, the stroller frame can be moved from an expanded position to a folded position after the locking device is unlocked. In the expanded position, the stroller frame can be used for riding, while in the folded position, it is convenient for storage or carrying. The stroller frame has a multi-link folding structure, and the coordinated movement of various components enables rapid folding, significantly reducing the storage volume.

[0032] like Figures 1 to 6 As shown, the stroller frame of this embodiment includes a bottom support frame 1, which includes a front leg 11 and a rear leg 12 rotatably connected to the front leg 11 around a first axis A, and the lower ends of the front leg 11 and the rear leg 12 are provided with wheels 13, and the upper end of the bottom support frame 1 is rotatably connected to the support rod 2 around a second axis B, and the stroller frame also includes a hand push rod 3, which is rotatably connected to the upper end of the support rod 2 around a third axis C on the hand push rod 3 and near its lower end, and a transmission rod 4 hinged to the two is provided between the lower end of the hand push rod 3 and the rear leg 12, and a traction assembly 5 is provided between the front leg 11 and the rear leg 12, which can pull the two together or unfold when the two move relative to each other, and a linkage rod 6 is provided on the transmission rod 4 and near its lower end and between the traction assembly 5, which can drive the traction assembly 5 to move when the transmission rod 4 rotates, folds or unfolds relative to the rear leg 12. When folding, the push rod 3 rotates forward relative to the strut 2, causing the lower end of the strut 2 to rotate relative to the bottom support frame 1. Under the gravity of the strut 2 and the push rod 3, the lower end of the push rod 3 moves downward and rotates relative to the transmission rod 4, which in turn rotates relative to the rear leg 12. During this process, the linkage rod 6 pushes the traction assembly 5 to move, which in turn pulls the front leg 11 and the rear leg 12 to rotate relative to each other and move closer. The push rod 3, strut 2, and transmission rod 4 also rotate and move closer to the rear leg 12, achieving a coordinated movement. Similarly, when the stroller frame is unfolded, a coordinated movement can be achieved.

[0033] like Figures 1 to 6As shown, the stroller frame also includes a seat frame 7, which supports a seat for a child. The rear side of the seat frame 7 is rotatably connected to the upper ends of the rear legs 12 about a fourth axis D. A connecting rod 8 is hingedly connected between the front side of the seat frame 7 and the traction assembly 5. This connecting rod 8 can move the seat frame 7 relative to the front legs 11 or extend when the traction assembly 5 moves the front legs 11 and rear legs 12 toward or away from each other. As the traction assembly 5 moves the front legs 11 and rear legs 12 toward or away from each other, the traction assembly 5 moves the connecting rod 8, which in turn moves the front side of the seat frame 7, thereby rotating the seat frame 7 relative to the rear legs 12, allowing the seat frame 7 to move toward or extend relative to the front legs 11, thereby achieving a coordinated movement of the seat frame 7. To fold, the entire stroller frame automatically folds simply by unlocking the locking mechanism and rotating the push rod 3 forward relative to the support rod 2, making the folding operation extremely convenient, fast, and flexible.

[0034] like Figures 1 to 6 As shown, the traction assembly 5 includes a first traction rod 51 and a second traction rod 52, the front end of the first traction rod 51 is rotatably connected to the front leg 11 around the fifth axis E, the rear end of the first traction rod 51 is rotatably connected to the front end of the second traction rod 52 around the sixth axis F, the rear end of the second traction rod 52 is rotatably connected to the rear leg 12 around the seventh axis G, the upper end of the linkage rod 6 is rotatably connected to the transmission rod 4 around the eighth axis H, the lower end of the linkage rod 6 is rotatably connected to the second traction rod 52 around the ninth axis I, the upper end of the connecting rod 8 is rotatably connected to the seat frame 7 around the tenth axis J, and the lower end of the connecting rod 8 is rotatably connected to the first traction rod 51 around the eleventh axis K. During the folding process, as the transmission rod 4 rotates relative to the rear leg 12 and moves closer to the rear leg 12, the transmission rod 4 pushes the linkage rod 6, which in turn pushes the second traction rod 52 to rotate downward relative to the rear leg 12. The second traction rod 52 then drives the first traction rod 51 to rotate relative to the front leg 11, and the connection point between the first and second traction rods 51, 52 moves downward, thereby pulling the front and rear legs 11, 12 closer together. As the first traction rod 51 rotates downward relative to the front leg 11, the first traction rod 511 pulls the connecting rod 8 downward, which in turn pulls the front side of the seat frame 7, causing the rear side of the seat frame 7 to rotate relative to the rear leg 12, thereby folding the seat frame 7. The entire linkage mechanism is cleverly designed, allowing the stroller frame to fold flexibly.

[0035] like Figure 1 and Figure 2As shown, the rear leg 12 includes a rear leg rod 121, the upper end of the rear leg rod 121 is fixedly connected to a connecting seat 122, the front leg 11 can be rotatably connected to one side of the connecting seat 122, and the support rod 2 can be rotatably connected to the other side of the connecting seat 122, so that the child stroller frame can be flexibly expanded or folded, and the structure is simple and compact.

[0036] like Figures 1 to 5 As shown, the stroller frame also includes a U-shaped handle bar 91. A connecting sleeve 92 is rotatably connected to the support rod 2 about a twelfth axis L. The handle bar 91 is inserted into the connecting sleeve 92 and can slide forward and backward. The rear end of the handle bar 91 is rotatably connected to the transmission rod 4 about a thirteenth axis M. When the transmission rod 4 rotates and folds relative to the rear leg 12, the transmission rod 4 pulls the handle bar 91 to slide within the connecting sleeve 92, causing the connecting sleeve 92 to rotate relative to the support rod 2. Ultimately, the handle bar 91 moves rearward and closes onto the support rod 2. This allows the handle bar 91 to extend forward longer when the stroller frame is deployed for the child to grasp. When the stroller frame is folded, the handle bar 91 moves rearward without protruding excessively forward, thereby reducing the folded volume and occupying less space.

[0037] like Figures 1 to 5 As shown, the upper end of the transmission rod 4 is hinged to the lower end of the push rod 3 around the fourteenth axis N, and the lower end of the transmission rod 4 is hinged to the rear leg 12 around the fifteenth axis P.

[0038] like Figure 1 and Figure 9As shown, the front end of the seat frame 7 is rotatably connected to a leg support frame 10, which can support the legs of the child so that the child can sit comfortably. Between the leg support frame 10 and the seat frame 7 is an adjustment structure that can adjust the rest position of the leg support frame 10, so that the leg support frame 10 can be adjusted to a suitable position to make the child feel comfortable. The adjustment structure includes a plurality of first engaging grooves 101 arranged on the seat frame 7 along the circumferential direction, and a plurality of second engaging grooves (not shown in the figure) are arranged on the leg support frame 10 along the circumferential direction. The space enclosed by the seat frame 7 and the leg support frame 10 is provided with a gear 102 that can move laterally therein and can engage with the first engaging groove 101 and the second engaging groove at the same time. The leg support frame 10 is provided with an operating component 103 that can pull the gear 102 out of the first engaging groove 101, and the gear 102 and the leg support frame are connected. 10 is also provided with a first return spring 104 that can push the gear 102 to move and reset. A fixed seat 105 is provided on the leg support frame 10. The operating component includes an operating block 106 that is provided on the fixed seat 105 and can slide relative to it. A first pull rope 107 that can pull the gear 102 out of the first engaging groove 101 when the operating block 106 slides is provided between the operating block 106 and the gear 102. A second return spring 108 that can push the operating block 106 to slide and reset is provided between the operating block 106 and the fixed seat 105. When the position of the leg support frame 10 needs to be adjusted, the operating block 106 is slid, thereby pulling the gear 102 out of the first engaging groove 101 through the first pull rope 107. At this time, the leg support frame 10 can be rotated. When it is adjusted to the appropriate position, the operating block 106 is released, and the second return spring 108 pushes the operating block 106 to reset, and the first return spring 104 pushes the gear 102 to reset, so that the gear 102 is engaged with the first engaging groove 101 and the second engaging groove at the same time to lock the position of the leg support frame 10.

[0039] like Figure 9 As shown, the fixing seat 105 is provided with a guide groove 100, and the operating block 106 is provided with a guide column 109 inserted into the guide groove 100 so that the operating block 106 can slide smoothly.

[0040] like Figure 7 and Figure 8As shown, the locking device includes a first connecting shell 31 provided on the hand push rod 3, a plurality of first card grooves 201 are provided on the first connecting shell 31 along the circumferential direction, a second connecting shell 22 is provided on the upper end of the support rod 2, a plurality of second card grooves 202 are provided on the second connecting shell 22 along the circumferential direction, and a spline 203 that can slide therein and can engage with the first card groove 201 and the second card groove 202 at the same time is provided in the space enclosed by the first connecting shell 31 and the second connecting shell 22, and a spline 203 is provided between the spline 203 and the first connecting shell 31. The movable block 204 can push the spline 203 to disengage from the first slot 201 when rotated. The upper end of the hand push rod 3 is provided with an operating member 205. A second pull rope 206 that can pull the movable block 204 to rotate is provided between the operating member 205 and the movable block 204. A third return spring 207 that can push the spline 203 to move and reset is provided between the spline 203 and the second connecting shell 22. A plurality of oblique protrusions 208 are provided on the first connecting shell 31 along the circumferential direction, and an oblique groove 209 that cooperates with the oblique protrusion 208 is provided on the movable block 204. To unlock, by pressing the operating member 205, the operating member 205 rotates the movable block 204 via the second pull cord 206. The inclined slot 209 on the movable block 204 slides relative to the inclined protrusion 208 on the first connecting shell 31. The inclined protrusion 208 pushes the movable block 204 to move laterally. The movable block 204 pushes the spline 203 to disengage from the first engaging slot 201. The locking device is now unlocked, allowing the stroller frame to be folded. Of course, the locking device can also adopt a conventional latch and socket locking structure, which will not be described in detail here.

[0041] When the stroller frame of the present invention is folded, once the locking device is unlocked and the push rod 3 is rotated forward, the stroller can be automatically folded. The folding is very convenient and quick, and the stroller can stand on the ground after folding. The folded volume is also very small, which is convenient for storage or carrying.

[0042] 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 scope of knowledge possessed by ordinary technicians in the technical field without departing from the present invention.

Claims

1. A 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) rotatably connected to the front leg (11) around a first axis (A), the lower ends of the front leg (11) and the rear leg (12) are both provided with wheels (13), the upper end of the bottom support frame (1) is rotatably connected to a support rod (2) around a second axis (B), the frame of the child stroller further comprises a push rod (3), the push rod (3) is rotatably connected to the upper end of the support rod (2) around a third axis (C) near its lower end, a transmission rod (4) is provided between the lower end of the push rod (3) and the rear leg (12), and a transmission rod (4) is provided between the front leg (11) and the rear leg (12) when the front leg (11) and the rear leg (12) are relatively movable. A traction assembly (5) capable of pulling the two together or unfolding, a linkage rod (6) is provided on the transmission rod (4) and near its lower end position and between the traction assembly (5), which is hinged to the two and can drive the traction assembly (5) to move when the transmission rod (4) rotates, folds or unfolds relative to the rear legs (12), the frame of the child stroller also includes a seat frame (7), the rear side of the seat frame (7) is rotatably connected to the upper end of the rear legs (12) around a fourth axis (D), and a connecting rod (8) is provided between the front side of the seat frame (7) and the traction assembly (5), which is hinged to the two and can drive the seat frame (7) to move relative to the front legs (11) when the traction assembly (5) drives the front legs (11) and the rear legs (12) to move together or unfold.

2. The stroller frame according to claim 1, characterized in that: The traction assembly (5) includes a first traction rod (51) and a second traction rod (52), wherein the front end of the first traction rod (51) is rotatably connected to the front leg (11) around a fifth axis (E), the rear end of the first traction rod (51) is rotatably connected to the front end of the second traction rod (52) around a sixth axis (F), the rear end of the second traction rod (52) is rotatably connected to the rear leg (12) around a seventh axis (G), the upper end of the linkage rod (6) is rotatably connected to the transmission rod (4) around an eighth axis (H), the lower end of the linkage rod (6) is rotatably connected to the second traction rod (52) around a ninth axis (I), the upper end of the connecting rod (8) is rotatably connected to the seat frame (7) around a tenth axis (J), and the lower end of the connecting rod (8) is rotatably connected to the first traction rod (51) around an eleventh axis (K).

3. The stroller frame according to claim 1, characterized in that: The hind leg (12) includes a hind leg rod (121), the upper end of the hind leg rod (121) is fixedly connected to a connecting seat (122), the front leg (11) is rotatably connected to one side of the connecting seat (122), and the support rod (2) is rotatably connected to the other side of the connecting seat (122).

4. The stroller frame according to claim 1, characterized in that: The stroller frame further comprises a U-shaped handrail (91), a connecting sleeve (92) is rotatably connected to the support rod (2) around a twelfth axis (L), the handrail (91) is inserted into the connecting sleeve (92) and can slide back and forth, and a rear end of the handrail (91) is rotatably connected to a transmission rod (4) around a thirteenth axis (M).

5. The stroller frame according to claim 1, characterized in that: The upper end of the transmission rod (4) is hinged to the lower end of the push rod (3) around the fourteenth axis (N), and the lower end of the transmission rod (4) is hinged to the rear leg (12) around the fifteenth axis (P).

6. The stroller frame according to claim 1, characterized in that: The front end of the seat frame (7) is rotatably connected to the leg support frame (10), and an adjustment structure capable of adjusting the rest position of the leg support frame (10) is provided between the leg support frame (10) and the seat frame (7). The adjustment structure comprises a plurality of first engaging grooves (101) provided on the seat frame (7) along the circumferential direction, and a plurality of second engaging grooves are provided on the leg support frame (10) along the circumferential direction. A gear (102) capable of moving laterally therein and engaging with the first engaging groove (101) and the second engaging groove at the same time is provided in the space enclosed by the docking of the seat frame (7) and the leg support frame (10). The leg support frame (10) is provided with an operating component (103) capable of pulling the gear (102) out of the first engaging groove (101), and a first reset spring (104) capable of pushing the gear (102) to move and reset is also provided between the gear (102) and the leg support frame (10).

7. The stroller frame according to claim 6, characterized in that: The leg support frame (10) is provided with a fixed seat (105), and the operating component (103) includes an operating block (106) provided on the fixed seat (105) and capable of sliding relative thereto. A first pull rope (107) is provided between the operating block (106) and the gear (102) and can pull the gear (102) out of the first engaging groove (101) when the operating block (106) slides. A second return spring (108) is provided between the operating block (106) and the fixed seat (105) and can push the operating block (106) to slide and return to its original position.

8. The stroller frame according to claim 7, characterized in that: The fixing seat (105) is provided with a guide groove (100), and the operating block (106) is provided with a guide column (109) inserted into the guide groove (100).

9. The child stroller frame according to any one of claims 1 to 8, characterized in that: The locking device comprises a first connecting shell (31) provided on the hand push rod (3), a plurality of first card slots (201) are provided on the first connecting shell (31) along the circumferential direction, a second connecting shell (22) is provided on the upper end of the support rod (2), a plurality of second card slots (202) are provided on the second connecting shell (22) along the circumferential direction, and a spline (202) is provided in the space enclosed by the first connecting shell (31) and the second connecting shell (22) that can slide therein and can engage with the first card slot (201) and the second card slot (202) at the same time. 3), a movable block (204) is provided between the spline (203) and the first connecting shell (31) and can push the spline (203) to disengage from the first slot (201) when rotating, an operating member (205) is provided at the upper end of the hand push rod (3), a second pull rope (206) is provided between the operating member (205) and the movable block (204) and can pull the movable block (204) to rotate, and a third reset spring (207) is provided between the spline (203) and the second connecting shell (22) and can push the spline (203) to move and reset.

10. The stroller frame according to claim 9, characterized in that: The first connecting shell (31) is provided with a plurality of oblique protrusions (208) along the circumferential direction, and the movable block (204) is provided with an oblique groove (209) matched with the oblique protrusions (208).

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