Baby carriage with trunk

By designing a suitcase with rollers and an expandable and foldable bracket on the baby stroller, and using a positioning switch and positioning mechanism, the inconvenience of carrying multiple items in the baby stroller is solved, achieving a more convenient user experience and high safety.

CN223407988UActive Publication Date: 2025-10-03PINGHU JAMIE CAT INTELLIGENT EQUIP MFG CO LTD
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Patent Information

Application Number
CN202423104704.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-16
Publication Date
2025-10-03
Estimated Expiration
2034-12-16

AI Technical Summary

Technical Problem

Existing baby strollers are very inconvenient for parents to carry baby items and luggage when traveling long distances, especially when traveling alone with a child.

Method used

A baby stroller with a luggage box is designed. The bottom of the luggage box is provided with rollers. The bracket can be expanded or folded. The stability is ensured by the positioning switch and positioning mechanism. The seat and backrest can be rotated and positioned for easy expansion and folding.

Benefits of technology

The stroller can carry more items while being easy to unfold and fold, with a stable structure and high safety.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a baby carriage with a trunk, which belongs to the field of baby carriages and comprises a box, rollers are arranged at the bottom of the box, a support is rotatably connected onto the box, front wheels are arranged at the bottom end of the support, a telescopic pull rod is arranged on the support, and the support has a folded state and an unfolded state. A first positioning switch for positioning the support in an unfolded state is arranged on the box, a chair seat and a chair back are rotatably arranged on the support, and a second positioning switch for positioning the chair back in a use state after rotation is arranged on the support; and a third positioning mechanism for positioning the chair seat in a use state after rotation is arranged on the bracket. The baby carriage with the trunk can carry more baby articles and is convenient to unfold and fold.
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Description

Technical Field

[0001] The utility model relates to the technical field of baby carriages, in particular to a baby carriage with a luggage box. Background Art

[0002] A stroller is a handcart specially designed for transporting babies, allowing babies to rest in the car, replacing the previous baby carrier or cradle. A stroller can provide a more comfortable and stable environment for babies, and provide a certain amount of space for babies to move around. At the same time, it reduces the inconvenience of carrying babies out for parents. It is an indispensable tool for going out during the baby's growth process.

[0003] However, today's strollers will encounter some problems during travel, especially when traveling long distances. Parents often need to carry a lot of baby-related things, and sometimes even need to push a suitcase, which is very inconvenient for only one parent with a child. Utility Model Content

[0004] In order to carry more baby items, the present application provides a baby stroller with a luggage box.

[0005] The present application provides a baby stroller with a luggage box adopts the following technical solution:

[0006] A baby stroller with a suitcase comprises a suitcase, the bottom of which is provided with rollers, a bracket rotatably connected to the suitcase, a front wheel provided at the bottom end of the bracket, a telescopic pull rod provided on the bracket, the bracket having two states: folded and unfolded, a first positioning switch provided on the suitcase for positioning the bracket in the unfolded state, a seat and a backrest rotatably provided on the bracket, a second positioning switch provided on the bracket for positioning the backrest when in the rotated use state, and a third positioning mechanism provided on the bracket for positioning the seat when in the rotated use state.

[0007] Optionally, the first positioning switch includes a first card block, a first spring and a booster block. The box is provided with a first card slot that is engaged with the first card block when the bracket is in the expanded state. The bracket is provided with a long strip card slot for the first card block to move horizontally. The booster block is pressed against one side of the first card block. One end of the first spring is connected to the other side of the first card block opposite to the booster block, and the other end is connected to the inner wall of the long strip card slot.

[0008] Optionally, a pressing plate is provided on the bracket, a pressing groove for pressing the pressing plate is provided on the bracket, a second spring is provided in the pressing groove, one end of the second spring is connected to the bottom wall of the pressing groove, and the other end is connected to the inner wall of the pressing plate, a first inclined surface is provided on the pressing plate, and a second inclined surface is provided on the booster block which is adapted to the first inclined surface and pushes the booster block to move laterally after being subjected to force.

[0009] Optionally, a first hook is provided on the pressing plate, a second hook is slidably connected to the box, the second hook moves in the radial direction of the rotation axis of the bracket, a first sliding groove is provided on the box for the second hook to slide, a third spring is provided in the first sliding groove for positioning the second hook, a third inclined surface is provided on the first hook, and a fourth inclined surface is provided on the second hook for matching the third inclined surface and pushing the second hook to move after being subjected to force, when the first hook and the second hook are hooked together, the first clamping block is located outside the first clamping groove.

[0010] Optionally, two first card slots are provided. When the bracket is in a folded state, the first card block is clamped in one of the first card slots. When the bracket is in an expanded state, the first card block is clamped in the other first card slot.

[0011] Optionally, the second positioning switch includes a push plate, a connecting rod, a connecting frame and a second card block, the bracket is provided with a second card slot that engages with the second card block, the connecting rod and the second card block are respectively fixed on the connecting frame, the connecting rod, the connecting frame and the second card block are slidably arranged in the chair back, the chair back is provided with a through hole for the second card block to pass through, the connecting rod extends to the outside of the chair back and is fixedly connected to the push plate, the chair back is provided with a second sliding groove for the connecting rod to slide, and the chair back is provided with a fifth spring for positioning the connecting frame.

[0012] Optionally, the third positioning mechanism includes a third clamping block, and the seat is provided with a third sliding groove for the third clamping block to slide in the radial direction relative to the seat rotation axis, and the third sliding groove is provided with a fourth spring, one end of the fourth spring is connected to the bottom wall of the third sliding groove, and the other end is connected to the inner end of the third clamping block, and the third clamping block extends outside the third sliding groove, and the bracket is provided with a stop block for clamping and limiting the third clamping block.

[0013] Optionally, the third clamping block is provided with a fifth inclined surface, and the chair back is provided with a pressing block that acts on the fifth inclined surface during the rotation process to force the third clamping block to move into the third sliding groove.

[0014] In summary, this application includes at least one of the following beneficial technical effects:

[0015] A suitcase is installed on the stroller, which can carry more baby items. The stroller is convenient to unfold and fold, has a stable structure and is highly safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the embodiment of the present application in the folded state.

[0017] Figure 2 It is a three-dimensional diagram of the embodiment of the present application in the unfolded state.

[0018] Figure 3 This is a structural diagram of the first positioning switch in an embodiment of the present application.

[0019] Figure 4 It is a structural diagram of the pressing plate in an embodiment of the present application.

[0020] Figure 5 This is a structural diagram of the pressing plate between the booster blocks in an embodiment of the present application.

[0021] Figure 6 This is a partial schematic diagram of the first positioning switch in an embodiment of the present application.

[0022] Figure 7 It is a partial schematic diagram of the second hook body in the embodiment of the present application.

[0023] Figure 8 It is a structural diagram of the chair back in an embodiment of the present application.

[0024] Figure 9 It is a structural diagram of the connecting frame in an embodiment of the present application.

[0025] Figure 10 It is a structural diagram of the second positioning switch in an embodiment of the present application.

[0026] Figure 11 It is a structural diagram between the chair back, seat and bracket in the embodiment of the present application.

[0027] Figure 12 It is a structural diagram of the rotating seat in the embodiment of the present application.

[0028] Explanation of reference numerals: 1. roller; 2. front wheel; 3. bracket; 4. box; 41. box body; 42. connecting block; 5. telescopic pull rod; 6. first positioning switch; 61. first clamping block; 62. first spring; 63. boosting block; 64. first clamping slot; 65. long strip clamping slot; 66. slot; 7. seat; 71. seat body; 72. rotating seat; 8. backrest; 9. second positioning switch; 91. push plate; 92. connecting rod; 93. connecting frame; 94. second clamping block; 95. second clamping slot; 96. through hole; 97. second sliding slot; 98. Fifth spring; 10. Third positioning mechanism; 101. Third clamping block; 102. Third sliding groove; 103. Fourth spring; 104. Stop block; 105. Limit rod; 106. Guide groove; 107. Through groove; 11. Pressing plate; 12. Pressing groove; 13. Second spring; 14. First inclined surface; 15. Second inclined surface; 16. First hook body; 17. Second hook body; 18. First sliding groove; 19. Third spring; 20. Third inclined surface; 21. Fourth inclined surface; 22. Fifth inclined surface; 23. Pressing block; 24. Through hole. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-12 This application is described in further detail.

[0030] The present application embodiment discloses a baby carriage with a luggage box, referring to Figure 1 and Figure 2 , including a box 4, the box 4 includes a box body 41 and connecting blocks 42 fixedly arranged on the left and right sides of the box body 41, two rollers 1 are provided at the bottom of the box body 41, and a bracket 3 is rotatably connected to the box 4, and two front wheels 2 are provided at the bottom end of the bracket 3, and the front wheels 2 are universal wheels. A telescopic pull rod 5 is provided on the bracket 3, and the telescopic pull rod 5 is a common pull rod on a suitcase and is not elaborated in detail. The bracket 3 has two states of folding and unfolding. When the bracket 3 is in the unfolded state, it is supported on the ground by the two front wheels 2 and the two rollers 1, so that the baby carriage can be pushed stably on the ground. A first positioning switch 6 for positioning the bracket 3 in the unfolded state is provided on the box 4, and a seat 7 and a backrest 8 are rotatably provided on the bracket 3. A second positioning switch 9 for positioning the backrest 8 when it is rotated and used is provided on the bracket 3. A third positioning mechanism 10 for positioning the seat 7 when it is rotated and used is provided on the bracket 3.

[0031] Recombination Figures 3 to 7 As shown, the first positioning switch 6 includes a first card block 61, a first spring 62 and a booster block 63. A first card slot 64 is provided on the connecting block 42, which is engaged with the first card block 61 when the bracket 3 is in the expanded state. A long strip card slot 65 is provided on the bracket 3 for the first card block 61 to move horizontally. A slot 66 is provided on one side of the first card block 61, and the booster block 63 is inserted into the slot 66. One end of the first spring 62 is connected to the other side of the first card block 61 opposite to the booster block 63, and the other end is connected to the inner wall of the long strip card slot 65. The booster block 63 is slidably arranged in the bracket 3, and the sliding direction of the booster block 63 is the same as that of the first card block 61. When the bracket 3 is in the expanded state, the first block 61 can be positioned in the first slot 64 under the action of the first spring 62, so that the bracket 3 is limited by the first block 61, and no rotation occurs between the bracket 3 and the box 4; when the bracket 3 needs to be folded, the booster block 63 can be pushed, and the booster block 63 will move together with the first block 61, and the first block 61 will move in the long slot 65, and the first spring 62 will be compressed. When the first block 61 is moved out of the first slot 64, the bracket 3 and the box 4 can rotate.

[0032] A pressing plate 11 is provided on the bracket 3, and a pressing groove 12 for pressing the pressing plate 11 is provided on the bracket 3. The pressing plate 11 is slidably arranged in the pressing groove 12, and the sliding direction of the pressing plate 11 is the direction of the rotation axis of the bracket 3. A second spring 13 is provided in the pressing groove 12, and one end of the second spring 13 is connected to the bottom wall of the pressing groove 12, and the other end is connected to the inner wall of the pressing plate 11. A first inclined surface 14 is provided on the pressing plate 11, and a second inclined surface 15 suitable for the first inclined surface 14 is provided on the booster block 63. When the pressing plate 11 is pushed hard, the first inclined surface 14 on the pressing plate 11 will contact the second inclined surface 15 of the booster block 63. After continuing to push, the booster block 63 can be pushed to move.

[0033] Two first hooks 16 are fixed on the pressing plate 11, and a second hook 17 is horizontally slidably connected to the connecting block 42. A through hole 24 is provided on the bracket 3 for the first hook 16 to pass through the bracket 3, and the second hook 17 moves in the radial direction of the rotation axis of the bracket 3. A first sliding groove 18 for the second hook 17 to slide is provided on the connecting block 42, and a third spring 19 for positioning the second hook 17 is provided in the first sliding groove 18. A third inclined surface 20 is provided on the first hook 16, and a fourth inclined surface 21 adapted to the third inclined surface 20 is provided on the second hook 17. When the pressing plate 11 is pushed to move, the first hook body 16 will move with the pressing plate 11. When the third inclined surface 20 on the first hook body 16 conflicts with the fourth inclined surface 21 of the second hook body 17, the first hook body 16 will push the second hook body 17 to move horizontally while continuing to move. The second hook body 17 will move in the first sliding groove 18, and the third spring 19 will be compressed. Finally, the first hook body 16 and the second hook body 17 can be hooked together. When the first hook body 16 and the second hook body 17 are hooked together, the pressing plate 11 can be limited. At this time, the first clamping block 61 is also located outside the first clamping groove 64, which makes it very convenient to rotate the bracket 3. There is no need to manually press the pressing plate 11 to rotate the bracket 3, which makes the operation more convenient.

[0034] There are two first slots 64. When the bracket 3 is in the folded state, the first block 61 is engaged with one of the first slots 64; when the bracket 3 is in the expanded state, the first block 61 is engaged with the other first slot 64. This allows the bracket 3 to be limited in position even in the folded state, allowing it to be used as a suitcase, and the bracket 3 is unlikely to unfold during use. There are four second hooks 17. When the bracket 3 is in the folded state, pushing the pressing plate 11 allows the two first hooks 16 to hook with the corresponding two second hooks 17; when the bracket 3 is in the expanded state, pushing the pressing plate 11 allows the two first hooks 16 to hook with the other two corresponding second hooks 17. When the first clamping block 61 is outside the first clamping slot 64, the bracket 3 rotates, and the first clamping block 61 and the pressing plate 11 will also rotate with the bracket 3, and the first hook 16 and the second hook 17 will also rotate relative to each other, and the first hook 16 will be disengaged from the second hook 17. The first hook 16 and the pressing plate 11 move outward under the action of the second spring 13, and the first hook 16 will be hooked onto the bracket 3. When the first clamping block 61 rotates to correspond to the other first clamping slot 64, the first clamping block 61 is clamped into the first clamping slot 64 under the action of the first spring 62, and the first hook 16 also moves to the position corresponding to the other pair of second hooks 17.

[0035] Reference Figure 1 、 Figures 8 to 11 As shown, the second positioning switch 9 includes a push plate 91, a connecting rod 92, a connecting frame 93 and a second clamping block 94. A second clamping groove 95 that is engaged with the second clamping block 94 is provided on the bracket 3. The connecting rod 92 and the second clamping block 94 are respectively fixed on the connecting frame 93. The connecting rod 92, the connecting frame 93 and the second clamping block 94 are arranged in the chair back 8 for sliding up and down. A through hole 96 for the second clamping block 94 to pass through is provided on the chair back 8. The connecting rod 92 extends to the outside of the chair back 8 and is fixedly connected to the push plate 91. A second sliding groove 97 for the connecting rod 92 to slide is provided on the chair back 8. A fifth spring 98 is provided in the chair back 8 for positioning the connecting frame 93. The second clamping block 94 can be stably engaged in the second clamping groove 95 through the elastic force of the fifth spring 98, so that the chair back 8 is not easy to rotate.

[0036] There are three second latching slots 95, corresponding to the folded state of the seat back 8, the extended state of the seat back 8, and the state after the seat back 8 is further rotated backward after being extended. When the seat back 8 needs to be extended from the folded state, it is only necessary to pull the push plate 91 to move the connecting rod 92, the connecting frame 93, and the second latching block 94 together. The fifth spring 98 is compressed, and the second latching block 94 can be disengaged from the second latching slot 95, so that the seat back 8 can be rotated to a desired angle.

[0037] Reference Figure 6 、 Figure 11 and Figure 12 The third positioning mechanism 10 includes a third clamping block 101, the seat 7 includes a seat body 71 and two rotating seats 72 fixedly connected to the seat body 71. The two rotating seats 72 are respectively rotatably connected to the connecting block 42. A third sliding groove 102 is provided on the rotating seat 72 for the third clamping block 101 to slide in the radial direction of the rotation axis of the rotating seat 72. A fourth spring 103 is provided in the third sliding groove 102. One end of the fourth spring 103 is connected to the bottom wall of the third sliding groove 102, and the other end is connected to the inner end of the third clamping block 101. The third clamping block 101 extends outside the third sliding groove 102. A stop block 104 is provided on the bracket 3 to clamp and limit the third clamping block 101. When the seat 7 is in the unfolded state, the third clamping block 101 is limited by the stop block 104, so that the seat 7 cannot continue to rotate downward and can be used for people to sit.

[0038] A fifth inclined surface 22 is provided on the third clamping block 101, and a pressing block 23 is provided on the seat back 8, which acts on the fifth inclined surface 22 during the rotation process to force the third clamping block 101 to move into the third sliding groove 102. When the seat back 8 and the seat 7 need to be folded, during the process of rotating the seat back 8, the pressing block 23 will come into contact with the fifth inclined surface 22 of the third clamping block 101, and after continuing to rotate, the third clamping block 101 can be urged to gradually move into the third sliding groove 102 until the third clamping block 101 and the stop block 104 are disengaged from each other, so that the seat back 8 and the seat 7 can be rotated together, and there is no need to manually press the third clamping block 101, making the folding of the baby stroller more convenient and quick; when the seat 7 is in the folded state, the stop block 104 is located at the third Outside the sliding groove 102, the third clamping block 101 is limited in the third sliding groove 102 by the stop block 104, and the third clamping block 101 abuts against the stop block 104. When the seat 7 needs to be unfolded, during the process of rotating the seat 7, the third clamping block 101 and the stop block 104 will also move relative to each other until the third clamping block 101 and the stop block 104 are misaligned with each other. Under the action of the fourth spring 103, the third clamping block 101 protrudes out of the third sliding groove 102 and engages with the stop block 104, so that the seat 7 is restricted and can be used for sitting. When the seat 7 is in the folded state, the seat 7 is located between the box 4 and the seat back 8, and the box 4 and the seat back 8 can limit the seat 7.

[0039] Two limiting rods 105 are provided on the third clamping block 101. A through slot 107 is provided on the third clamping block 101 for the limiting rods 105 to pass through. The limiting rods 105 are parallel to the rotation axis of the rotating seat 72. A guide slot 106 is provided on the rotating seat 72 for the limiting rods 105 to slide. The sliding direction of the limiting rods 105 is the same as that of the third clamping block 101. The guide slot 106 extends through the third clamping block 101 along the axial direction of the limiting rods 105. The provision of the limiting rods 105 and the guide slot 106 provides a more elastic limit for the third clamping block 101, ensuring that the elastic force of the fourth spring 103 always acts on the third clamping block 101. When the third clamping block 101 slides out of the third sliding slot 102, the limiting rods 105, the fourth spring 103, and the rotating seat 72 work together to stabilize the third clamping block 101, thereby making the entire seat 7 more stable and secure.

[0040] The implementation principle of the baby stroller with luggage in the embodiment of the present application is as follows: when the bracket 3, the seat 7 and the backrest 8 are all in the folded state, it can be used as a regular luggage; when the baby needs to ride, the pressing plates 11 on the left and right sides can be pressed to open the first positioning switch 6, and then the bracket 3 can be rotated to unfold the bracket 3, and the first positioning switch 6 will limit the bracket 3 in the unfolded state, and then the push plate 91 can be pulled to open the second positioning switch 9, and then the backrest 8 and the seat 7 can be rotated to make the backrest 8 and the seat 7 in the unfolded state for people to ride, and the second positioning switch 9 can limit the backrest 8. The third positioning mechanism 10 can limit the seat 7, and the unfolded seat 7 and backrest 8 can be used for the baby to sit (a seat belt can also be installed for safety); when the stroller needs to be folded, it is only necessary to pull the push plate 91 to turn on the second positioning switch 9, and then rotate the backrest 8. During the rotation of the backrest 8, the pressing block 23 on the backrest 8 will automatically press the third block 101 into the third sliding groove 102, so that the seat 7 can rotate with the backrest 8, and then press the pressing plates 11 on both sides of the right to turn on the first positioning switch 6, and finally rotate the bracket 3 to fold the bracket 3.

[0041] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A baby stroller with a luggage compartment, characterized by: The invention comprises a box (4), wherein a roller (1) is provided at the bottom of the box (4), a bracket (3) is rotatably connected to the box (4), a front wheel (2) is provided at the bottom end of the bracket (3), a telescopic pull rod (5) is provided on the bracket (3), and the bracket (3) has two states: folded and unfolded. A first positioning switch (6) is provided on the box (4) for positioning the bracket (3) in the unfolded state. A seat (7) and a backrest (8) are rotatably provided on the bracket (3), a second positioning switch (9) is provided on the bracket (3) for positioning the backrest (8) in the use state after rotation, and a third positioning mechanism (10) is provided on the bracket (3) for positioning the seat (7) in the use state after rotation.

2. The baby stroller with a luggage box according to claim 1, characterized in that: The first positioning switch (6) comprises a first card block (61), a first spring (62) and a boosting block (63); the box (4) is provided with a first card slot (64) which is engaged with the first card block (61) when the bracket (3) is in the unfolded state; the bracket (3) is provided with a long strip card slot (65) for the first card block (61) to move laterally; the boosting block (63) abuts against one side of the first card block (61); one end of the first spring (62) is connected to the other side of the first card block (61) relative to the boosting block (63), and the other end is connected to the inner wall of the long strip card slot (65); the boosting block (63) is slidably arranged in the bracket (3); and the sliding direction of the boosting block (63) is the same as that of the first card block (61).

3. The baby stroller with a luggage box according to claim 2, characterized in that: The bracket (3) is provided with a pressing plate (11), the bracket (3) is provided with a pressing groove (12) for the pressing plate (11) to press, a second spring (13) is provided in the pressing groove (12), one end of the second spring (13) is connected to the bottom wall of the pressing groove (12), and the other end is connected to the inner wall of the pressing plate (11), the pressing plate (11) is provided with a first inclined surface (14), and the boosting block (63) is provided with a second inclined surface (15) adapted to the first inclined surface (14) and pushed to move the boosting block (63) laterally after receiving force.

4. The baby stroller with a luggage box according to claim 3, characterized in that: The pressing plate (11) is provided with a first hook (16), and the box (4) is slidably connected with a second hook (17), and the second hook (17) moves in the radial direction of the rotation axis of the bracket (3). The box (4) is provided with a first sliding groove (18) for the second hook (17) to slide, and a third spring (19) is provided in the first sliding groove (18) for positioning the second hook (17). The first hook (16) is provided with a third inclined surface (20), and the second hook (17) is provided with a fourth inclined surface (21) that matches the third inclined surface (20) and pushes the second hook (17) to move after receiving force. When the first hook (16) and the second hook (17) are hooked together, the first clamping block (61) is located outside the first clamping groove (64).

5. The baby stroller with a luggage box according to claim 4, characterized in that: Two first card slots (64) are provided. When the bracket (3) is in a folded state, the first card block (61) is clamped in one of the first card slots (64). When the bracket (3) is in an expanded state, the first card block (61) is clamped in the other first card slot (64).

6. The baby stroller with a luggage box according to claim 1, characterized in that: The second positioning switch (9) includes a push plate (91), a connecting rod (92), a connecting frame (93) and a second card block (94); the bracket (3) is provided with a second card slot (95) for engaging with the second card block (94); the connecting rod (92) and the second card block (94) are respectively fixed on the connecting frame (93); the connecting rod (92), the connecting frame (93) and the second card block (94) are arranged in the chair back (8) in a sliding manner; the chair back (8) is provided with a through hole (96) for the second card block (94) to pass through; the connecting rod (92) extends to the outside of the chair back (8) and is fixedly connected to the push plate (91); the chair back (8) is provided with a second sliding groove (97) for the connecting rod (92) to slide; and the chair back (8) is provided with a fifth spring (98) for positioning the connecting frame (93).

7. The baby stroller with a luggage box according to claim 1, characterized in that: The third positioning mechanism (10) includes a third clamping block (101), a third sliding groove (102) is provided on the seat (7) for the third clamping block (101) to slide in the radial direction relative to the rotation axis of the seat (7), a fourth spring (103) is provided in the third sliding groove (102), one end of the fourth spring (103) is connected to the bottom wall of the third sliding groove (102), and the other end is connected to the inner end of the third clamping block (101), the third clamping block (101) extends outside the third sliding groove (102), and the bracket (3) is provided with a stop block (104) for clamping and limiting the third clamping block (101).

8. The baby stroller with a luggage box according to claim 7, characterized in that: The third clamping block (101) is provided with a fifth inclined surface (22), and the chair back (8) is provided with a pressing block (23) which acts on the fifth inclined surface (22) during the rotation process to force the third clamping block (101) to move into the third sliding groove (102).