Baby carriage frame convenient to fold

Abstract

The utility model discloses a baby carriage frame convenient to fold, which comprises a frame main body, the frame main body comprises a front foot stool, a rear foot stool and a seat frame, a joint structure is provided with a first locking mechanism and a second locking mechanism, and the seat frame is further provided with a first switch mechanism. The first switch mechanism is connected with the second locking mechanism through a first inhaul cable so that the first switch mechanism can drive the second locking mechanism to be unlocked, and a first linkage structure capable of driving the first locking mechanism to be unlocked when the second locking mechanism is unlocked is arranged between the second locking mechanism and the first locking mechanism. According to the scheme, the second locking mechanism is unlocked through the first switching mechanism, and the linkage structure capable of driving the first locking mechanism to be unlocked when the second locking mechanism is unlocked is arranged between the second locking mechanism and the first locking mechanism, so that rapid folding and unfolding of the baby carriage are achieved; a user can easily change the state of the baby carriage through the first switch mechanism and the turnover seat frame, so that the baby carriage is convenient to carry and store.

Description

Technical Field

[0001] The utility model relates to the technical field of baby carriages, in particular to a baby carriage frame which is easy to fold. Background Art

[0002] As modern families pay more and more attention to the convenience and safety of children's products, the design and function of baby strollers, as an important tool for infants and young children to travel, are also constantly evolving. Traditional baby stroller frames mostly adopt a fixed structure. Although they have certain advantages in stability, they are not portable and take up a lot of space, which brings many inconveniences to parents when carrying and storing. In recent years, foldable baby strollers have been widely welcomed due to their portability and space-saving characteristics, and have become the mainstream product on the market.

[0003] However, there are still some shortcomings in the existing foldable baby stroller frame designs. First, many folding mechanisms are complex and require multiple steps to operate, which makes the operation process cumbersome and time-consuming for parents who are eager to deal with their children or carry a lot of personal belongings. Therefore, the market is in urgent need of a baby stroller frame that is more user-friendly, easy to operate, and ensures high stability and safety. In particular, how to achieve fast, one-handed folding of baby strollers through innovative joint structures and locking mechanisms has become a technical problem that needs to be solved in the field of baby stroller design.

[0004] The utility model is made based on the above situation. Utility Model Content

[0005] The utility model overcomes the shortcomings of the prior art and provides a baby carriage frame which is easy to fold.

[0006] The utility model is realized through the following technical solutions:

[0007] A baby carriage frame that is easy to fold, includes a frame body, the frame body includes a front leg, a rear leg and a seat frame, the front leg, the rear leg and the seat frame are connected together by a joint structure, the joint structure is provided with a first locking mechanism that can lock the front leg and the rear leg, and a second locking mechanism that can lock the seat frame on the joint structure, the seat frame is also provided with a first switch mechanism, the first switch mechanism is connected to the second locking mechanism by a first cable so that the first switch mechanism can drive the second locking mechanism to unlock, and a first linkage structure is provided between the second locking mechanism and the first locking mechanism, which can drive the first locking mechanism to unlock when the second locking mechanism is unlocked.

[0008] A baby stroller frame that is easy to fold as described above, the baby stroller frame also includes a handle frame, the handle frame is rotatably connected to the joint structure, the handle frame is provided with a third locking mechanism that can lock it to the joint structure, and a second linkage structure that can unlock the third locking mechanism when the first linkage structure unlocks the first locking mechanism is provided between the joint structure and the handle frame. The handle frame is also provided with a second switch mechanism, and the second switch mechanism is connected to the third locking mechanism via a second cable so that the second switch mechanism can drive the third locking mechanism to unlock.

[0009] A baby carriage frame that is easy to fold as described above, the joint structure includes a front foot pivot seat connected to the front foot frame, a rear foot pivot seat connected to the rear foot frame, and a rotating seat connected to the seat frame, the first locking mechanism includes a first rear foot slot provided on the rear foot pivot seat and opening toward the front foot pivot seat, a front foot slot provided on the front foot pivot seat and opposite to the opening of the first rear foot slot, and a first spline partially located in the first rear foot slot and partially located in the front foot slot to limit the relative rotation of the front foot pivot seat and the rear foot pivot seat.

[0010] A baby stroller frame that is easy to fold as described above, the seat frame includes a base frame and a back seat frame, the rotating seat includes a connecting seat connected to the front leg pivot seat and a first seat frame pivot seat rotatably connected to the connecting seat, the first seat frame pivot seat is connected to the back seat frame, a second seat frame pivot seat is rotatably connected between the first seat frame pivot seat and the connecting seat, the second locking mechanism includes a seat frame slot arranged on the second seat frame pivot seat and opening toward the connecting seat, a limiting slot arranged on the connecting seat and opposite to the opening of the seat frame slot, and a second spline partially located in the seat frame slot and partially located in the limiting slot to limit the relative rotation of the base frame and the front leg frame.

[0011] As described above, a baby carriage frame that is easy to fold is provided with a first rotating member between the connecting seat and the second spline, and the first rotating member is provided with a first inclined surface that can push the second spline to slide when the first rotating member rotates. The first linkage structure includes a sliding ring that is slidably connected to the front foot pivot seat and can push the first spline out of the front foot slot, and a push block that is arranged on the second spline and can push the sliding ring.

[0012] As described above, in a baby carriage frame that is easy to fold, the first switch mechanism includes a first button arranged on the seat frame, the first cable is connected between the first button and the first rotating member so that when the first button is pressed, the first cable can drive the first rotating member to rotate, and a first return spring that can return the second spline to its original position is also provided in the limit slot.

[0013] The foldable baby stroller frame as described above is characterized in that the handle frame is connected to a handle pivot seat, the third locking mechanism includes a handle slot provided on the handle pivot seat and opening toward the rear foot pivot seat, a second rear foot slot provided on the rear foot pivot seat and facing the handle slot opening, and a third spline partially located in the handle slot and partially located in the second rear foot slot so as to limit the relative rotation of the handle pivot seat and the rear foot pivot seat. A second rotating member is provided in the handle slot, and a third spline is provided between the second rotating member and the third spline which can push the handle when the second rotating member rotates. The second linkage structure includes a push rod which is slidably connected to the rear foot pivot seat and can be pushed by the sliding ring to push the third spline out of the second rear foot slot to complete unlocking.

[0014] The foldable baby carriage frame as described above, wherein the lower parts of the front leg frame and the rear leg frame are rotatably connected to the wheel assembly via a rotating shaft, and an orientation mechanism is provided between the wheel assembly and the frame body, which can orient the wheel assembly after the handle frame changes direction, and the orientation mechanism includes a rotating frame connected to the wheel assembly, and the rotating frame is provided with an orientation hole, the lower part of the front leg frame is slidably connected to a front limit pin which can be inserted into the orientation hole to limit the reversal of the wheel assembly, and the lower part of the rear leg frame is slidably connected to a rear limit pin which can be inserted into the orientation hole to limit the reversal of the wheel assembly, the front leg pivot seat is slidably connected to a first slider, and the rear leg pivot seat is slidably connected to a second slider, and a connection is provided between the first slider and the front limit pin. A third cable is provided between the two, a fourth cable connecting the second slider and the rear limit pin is provided between the two, a rotating ring that can rotate with the handlebar pivot seat is provided between the front foot pivot seat and the rear foot pivot seat, the rotating ring is provided with a third inclined surface that pushes the first slider to slide when the handlebar frame flips forward to release the front limit pin, the rotating ring is provided with a fourth inclined surface that pushes the second slider to slide when the handlebar frame flips backward to release the rear limit pin, a third reset spring is provided between the first slider and the front leg frame, which can reset the first slider and pull the front limit pin out of the directional hole through the third cable, and a fourth reset spring is provided between the second slider and the rear leg frame, which can reset the second slider and pull the rear limit pin out of the directional hole through the fourth cable.

[0015] As described above, a baby carriage frame that is easy to fold is provided with a one-step double-brake structure on both the front leg and the rear leg, which can simultaneously brake the left and right wheel assemblies of the front leg or the left and right wheel assemblies of the rear leg, the one-step double-brake structure includes a brake device connected to the wheel assembly and a driving mechanism that drives the brake device to brake, the brake device includes a brake pin slidably connected to the wheel assembly, a brake slider that pushes the brake pin to insert into the wheel assembly for braking, a claw-shaped slider that pushes the brake slider to drive the brake pin, and a brake reset spring that resets the brake pin, the upper end of the claw-shaped slider is provided with an abutment ring surrounding the outside of the rotating shaft, the driving mechanism includes a top pressure block, a driving structure that drives the top pressure block to extend and push the abutment ring, and a fifth reset spring that resets the top pressure block.

[0016] In the foldable baby carriage frame as described above, an elastic member is provided between the front leg frame and the rear leg frame, which can pull the front leg frame and the rear leg frame to fold and close together when the first locking mechanism is unlocked.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. In this case, the second locking mechanism is unlocked by the first switch mechanism, and a linkage structure is provided between the second locking mechanism and the first locking mechanism, which can drive the first locking mechanism to unlock when the second locking mechanism is unlocked, thereby realizing the rapid folding and unfolding of the baby stroller. The user can easily change the state of the baby stroller through the first switch mechanism and the flip seat frame, making the baby stroller easy to carry and store.

[0019] 2. The handle frame is rotatably connected to the joint structure, and a third locking mechanism is provided on the handle frame, which can lock the handle frame on the joint structure, so that the handle frame can be turned over, which is convenient for parents to push the baby carriage to the front or rear side.

[0020] 3. Both the front and rear legs are provided with a one-step double-brake structure that can brake the left and right wheel assemblies of the front leg or the left and right wheel assemblies of the rear leg at the same time. The one-step double-brake structure enables the baby carriage to brake more stably, thereby reducing the shaking during braking. The upper end of the claw-shaped slider is provided with an abutment ring surrounding the outer side of the rotating shaft, that is, no matter what angle the wheel assembly rotates around the rotating shaft, the top pressure block can push the claw-shaped slider to brake.

[0021] 4. An elastic member is provided between the front leg and the rear leg. When the first locking mechanism is unlocked, the front leg and the rear leg can be pulled to fold together by themselves, thereby reducing the difficulty of folding for the user and allowing the user to fold the stroller more easily. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1It is a structural schematic diagram of the utility model;

[0024] Figure 2 It is a structural schematic diagram of the utility model without the seat frame;

[0025] Figure 3 This is a schematic diagram of the joint structure of the utility model. Figure 1 ;

[0026] Figure 4 This is a schematic diagram of the joint structure of the utility model. Figure 2 ;

[0027] Figure 5 It is an exploded schematic diagram of the front tripod of the utility model;

[0028] Figure 6 It is a structural schematic diagram of the rotating ring in the utility model;

[0029] Figure 7 It is a structural schematic diagram of the rotating frame in the utility model. DETAILED DESCRIPTION

[0030] The utility model is further described below in conjunction with the accompanying drawings:

[0031] like Figures 1 to 7 A foldable baby carriage frame is shown, comprising a frame body 1, wherein the frame body 1 comprises a front leg 2, a rear leg 3 and a seat frame 4, wherein the front leg 2, the rear leg 3 and the seat frame 4 are connected together via a joint structure 5, wherein the joint structure 5 is provided with a first locking mechanism 51 capable of locking the front leg 2 and the rear leg 3, and a second locking mechanism 41 capable of locking the seat frame 4 on the joint structure 5, wherein the seat frame 4 is further provided with a first switch mechanism 42, wherein the first switch mechanism 42 is connected to the second locking mechanism 41 via a first cable 43 so that the first switch mechanism 42 can drive the second locking mechanism 41 to unlock, and a linkage structure 44 capable of driving the first locking mechanism 51 to unlock when the second locking mechanism 41 is unlocked is provided between the second locking mechanism 41 and the first locking mechanism 51.

[0032] In this case, the second locking mechanism 41 is unlocked by the first switch mechanism 42, and a linkage structure is provided between the second locking mechanism 41 and the first locking mechanism 51, which can drive the first locking mechanism 51 to unlock when the second locking mechanism 41 is unlocked, thereby realizing the rapid folding and unfolding of the baby stroller. The user can easily change the state of the baby stroller through the first switch mechanism 42 and the flip seat frame 4, making the baby stroller easy to carry and store.

[0033] In some embodiments, the baby carriage frame further comprises a handle frame 6, the handle frame 6 is rotatably connected to the joint structure 5, the handle frame 6 is provided with a third locking mechanism 61 capable of locking it to the joint structure 5, a second linkage structure is further provided between the joint structure 5 and the handle frame 6, and the third locking mechanism 61 is unlocked when the first linkage structure unlocks the first locking mechanism 51, and a second switch mechanism 62 is further provided on the handle frame 6, the second switch mechanism 62 is connected to the third locking mechanism 61 through a second cable 63 so that the second switch mechanism 62 can drive the third locking mechanism 61 to unlock. The third locking mechanism 61 is unlocked by the second switch mechanism 62, so as to realize the front and rear flipping of the handle frame 6, which is convenient for parents to push the baby carriage to the front or rear side. The third locking mechanism 61 is unlocked by the second linkage structure when the first linkage structure unlocks the first locking mechanism 51, that is, when the seat frame 4 is folded, the front leg frame 2, the rear leg frame 3 and the handle frame 6 can be folded in a linked manner, that is, one unlocking structure can fold the entire baby carriage, and the folding is very convenient and quick. The second switch mechanism 62 is a conventional cable switch in a baby carriage and will not be described in detail here.

[0034] In some embodiments, the joint structure 5 includes a front foot pivot seat 52 connected to the front foot frame 2, a rear foot pivot seat 31 connected to the rear foot frame 3, and a rotating seat 45 connected to the seat frame 4. The first locking mechanism 51 includes a first rear foot slot 511 provided on the rear foot pivot seat 31 and opening toward the front foot pivot seat 52, a front foot slot 521 provided on the front foot pivot seat 52 and directly opposite to the opening of the first rear foot slot 511, and a first spline 53 partially located in the first rear foot slot 511 and partially located in the front foot slot 521 to limit the relative rotation of the front foot pivot seat 52 and the rear foot pivot seat 31. The first locking mechanism 51 is unlocked by pushing the first spline 53 out of the front foot slot 521. In one embodiment, a reset spring capable of resetting the first spline 53 is also provided in the first rear foot slot 511.

[0035] The seat frame 4 includes a base frame 46 and a back seat frame 47, the rotating seat 45 includes a connecting seat 451 connected to the front leg pivot seat 52 and a first seat frame pivot seat 452 rotatably connected to the connecting seat 451, the first seat frame pivot seat 452 is connected to the back seat frame 47, a second seat frame pivot seat 471 is rotatably connected between the first seat frame pivot seat 452 and the connecting seat 451, the second locking mechanism 41 includes a seat frame slot 472 arranged on the second seat frame pivot seat 471 and opening toward the connecting seat 451, a limiting slot 473 arranged on the connecting seat 451 and facing the opening of the seat frame slot 472, and a second spline 454 partially located in the seat frame slot 472 and partially located in the limiting slot 473 to limit the relative rotation of the base frame 46 and the front leg frame 2.

[0036] A first rotating member 453 is provided between the connecting seat 451 and the second spline 454. The first rotating member 453 is provided with a first inclined surface 4531 which can push the second spline 454 to slide when the first rotating member 453 rotates. The linkage structure includes a sliding ring 44 which is slidably connected to the front foot pivot seat 52 and can push the first spline 53 out of the front foot slot 521, and a push block 4541 which is arranged on the second spline 454 and can push the sliding ring 44.

[0037] Specifically, the front foot pivot seat 52 is provided with a first plug hole 411, the rotating seat 45 is provided with a second plug hole 412 at a position corresponding to the first plug hole 411, and the sliding ring 44 is provided with a first plug pin 441 that can be inserted into the first plug hole 411 and the second plug hole 412 at the same time. The sliding ring 44 and the first plug pin 441 are integrally formed, and in order to make the structure more stable, two first plug pins 441 are symmetrically provided on the sliding ring. When the second spline 454 moves toward the front foot pivot seat 52, the push block 4541 pushes the first plug pin 441, thereby pushing the first spline 53 out of the front foot slot 521 to complete the unlocking of the first locking mechanism 51.

[0038] The first switch mechanism 42 includes a first button 421 disposed on the seat frame 4, the first cable 43 is connected between the first button 421 and the first rotating member 453 so that when the first button 421 is pressed, the first cable 43 can drive the first rotating member 453 to rotate, and the limiting slot 473 is further provided with a first return spring 474 capable of returning the second spline 454. The first switch mechanism 42 is a conventional cable switch in a baby carriage and will not be described in detail here.

[0039] An elastic member 9 is provided between the front leg 2 and the rear leg 3, which can pull the front leg 2 and the rear leg 3 to fold and close together when the first locking mechanism 51 is unlocked. When the first locking mechanism 51 is unlocked, the elastic member 9 can pull the front leg 2 and the rear leg 3 to fold and close together by themselves, thereby reducing the difficulty of folding the baby stroller for the user, allowing the user to fold the baby stroller more easily. The elastic member 9 can be an elastic belt or other elastic structure.

[0040] The handle frame 6 is connected to a handle pivot seat 64, and the third locking mechanism 61 includes a handle slot 641 provided on the handle pivot seat 64 and opening toward the rear foot pivot seat 31, a second rear foot slot 32 provided on the rear foot pivot seat 31 and facing the opening of the handle slot 641, and a third spline 33 partially located in the handle slot 641 and partially located in the second rear foot slot 32 to limit the relative rotation of the handle pivot seat 64 and the rear foot pivot seat 31, and a second rotating member 35 is provided in the handle slot 641, and a third spline 33 is provided between the second rotating member 35 and the third spline 33 to push the third spline 33 to slide when the second rotating member 35 rotates. The second inclined surface 351 of the second rear foot slot 32 is formed, and the second reset spring 34 capable of resetting the third spline 33 is also arranged in the handlebar slot 641. The second switch mechanism 62 includes a second button arranged on the handlebar frame 6. The second cable 63 is connected between the second button and the second rotating member 35 so that when the second button is pressed, the second cable 63 can drive the second rotating member 35 to rotate and push the third spline 33 out of the second rear foot slot 32. The second linkage structure includes a push rod 65 which is slidably connected to the rear foot pivot seat 31 and can be pushed by the sliding ring 44 to push the third spline 33 out of the second rear foot slot 32 to complete unlocking. When the second spline 454 moves toward the front foot pivot seat 52, the push block 4541 pushes the sliding ring 44 to push the first spline 53 out of the front foot slot 521 to complete unlocking of the first locking mechanism 51. At the same time, the sliding ring 44 pushes the push rod 65 to push the third spline 33 out of the second rear foot slot 32 to complete unlocking of the third locking mechanism 61.

[0041] In one embodiment, the lower parts of the front tripod 2 and the rear tripod 3 are both rotatably connected to the wheel assembly 7 through a rotating shaft 70, and an orientation mechanism is provided between the wheel assembly 7 and the frame body 1, which can orient the wheel assembly 7 after the handle frame 6 changes direction. The orientation mechanism includes a rotating frame 71 connected to the wheel assembly 7, and the wheel is rotatably connected to the rotating frame 71. The rotating frame 71 is provided with an orientation hole 711, and the lower part of the front tripod 2 is slidably connected to a front limit pin 72 that can be inserted into the orientation hole 711 to limit the reversal of the wheel assembly 7, and the lower part of the rear tripod 3 is slidably connected to a rear limit pin 73 that can be inserted into the orientation hole 711 to limit the reversal of the wheel assembly 7, the front foot pivot seat 52 is slidably connected to a first slider 74, and the rear foot pivot seat 31 is slidably connected to a second slider 75, and a third pull pin connecting the first slider 74 and the front limit pin 72 is provided between the first slider 74 and the front limit pin 72. Cable 76, a fourth cable connecting the second slider 75 and the rear limit pin 73 is provided between the two, a rotating ring 79 that can rotate with the handlebar pivot seat 64 is provided between the front foot pivot seat 52 and the rear foot pivot seat 31, the rotating ring 79 is provided with a third inclined surface 791 that pushes the first slider 74 to slide when the handlebar frame 6 is flipped forward to release the front limit pin 72, and the rotating ring 79 is provided with a fourth inclined surface 792 that pushes the second slider 75 to slide when the handlebar frame 6 is flipped backward to release the rear limit pin 73, a third reset spring 77 that can reset the first slider 74 and the front leg frame 2 is provided between the first slider 74 and the front leg frame 2, thereby pulling the front limit pin 72 out of the directional hole 711 through the third cable 76, and a fourth reset spring 78 that can reset the second slider 75 and the rear leg frame 3 is provided between the second slider 75 and the rear leg frame 3.

[0042] When the handle frame 6 is flipped to the front side, the first slider 74 is pushed to slide to release the front limit pin 72. When the wheel assembly 7 has not rotated to the specified direction, the front limit pin 72 first abuts against the upper surface of the rotating frame 71. As the baby carriage is pushed, the wheel assembly 7 and the rotating frame 71 will gradually rotate around the rotating shaft 70 to make the direction of the wheel assembly 7 consistent with the direction of travel. When the direction of the wheel assembly 7 is consistent with the direction of travel, the front limit pin 72 is inserted into the directional hole 711 to complete the orientation. When the handle frame 6 is flipped to the rear side, The first slider 74 is reset and the front limit pin 72 is pulled out. The fourth inclined surface 792 pushes the second slider 75 to slide and release the rear limit pin 73. When the wheel assembly 7 has not rotated to the specified position, the rear limit pin 73 first abuts against the upper surface of the rotating frame 71. As the baby carriage is pushed, the wheel assembly 7 and the rotating frame 71 will gradually rotate around the rotating shaft 70 to make the direction of the wheel assembly 7 consistent with the direction of travel. When the direction of the wheel assembly 7 is consistent with the direction of travel, the rear limit pin 73 is inserted into the directional hole 711 to complete the orientation.

[0043] In some embodiments, the front leg 2 and the rear leg 3 are both provided with a one-step dual-brake structure 8 that can simultaneously brake the left and right wheel assemblies 7 of the front leg 2 or the left and right wheel assemblies 7 of the rear leg 3, the one-step dual-brake structure 8 includes a brake device connected to the wheel assembly 7 and a driving mechanism for driving the brake device to brake, the brake device includes a brake pin 714 slidably connected to the wheel assembly 7, a brake slider 713 that pushes the brake pin 714 to insert into the wheel assembly 7 for braking, a claw-shaped slider 712 that pushes the brake slider 713 to drive the brake pin 714, and a brake reset spring 715 for resetting the brake pin 714, the upper end of the claw-shaped slider 712 is provided with an abutment ring 7121 surrounding the outer side of the rotating shaft 70, the driving mechanism includes a top pressure block 81, a driving structure that drives the top pressure block 81 to extend and push the abutment ring 7121, and a fifth reset spring 82 for resetting the top pressure block 81. The driving mechanism is the same as or similar to the driving device for one-step double brakes of patent publication number CN112849249A, and the patent name is a driving device for one-step double brakes of a baby carriage. When the top pressure block 81 is extended, it pushes the claw-shaped slider 712 to move downward, and the claw-shaped slider 712 drives the brake slider 713 to move downward. The brake slider 713 pushes the brake pin 714 to insert into the slot on the wheel or abut against the wheel through the push-up inclined surface, thereby achieving a braking effect. When the top pressure block 81 is reset, the brake reset spring 715 drives the claw-shaped slider 712, the brake slider 713, and the brake pin 714 to reset, so that the wheel assembly 7 can be unlocked.

[0044] By stepping on both brakes, the baby carriage can brake more stably, thereby reducing the shaking during braking. The upper end of the claw-shaped slider 712 is provided with an abutment ring 7121 surrounding the outer side of the rotating shaft 70, that is, no matter to which angle the wheel assembly 7 rotates around the rotating shaft 70, the top pressure block 81 can push the claw-shaped slider 712 to brake.

Claims

1. A foldable baby carriage frame, characterized in that: The invention comprises a frame body (1), wherein the frame body (1) comprises a front leg frame (2), a rear leg frame (3) and a seat frame (4), wherein the front leg frame (2), the rear leg frame (3) and the seat frame (4) are connected together via a joint structure (5), wherein the joint structure (5) is provided with a first locking mechanism (51) capable of locking the front leg frame (2) and the rear leg frame (3), and a second locking mechanism (41) capable of locking the seat frame (4) on the joint structure (5), wherein the seat frame (4) is further provided with a first switch mechanism (42), wherein the first switch mechanism (42) is connected to the second locking mechanism (41) via a first cable (43) so that the first switch mechanism (42) can drive the second locking mechanism (41) to be unlocked, and wherein a first linkage structure capable of driving the first locking mechanism (51) to be unlocked when the second locking mechanism (41) is unlocked is provided between the second locking mechanism (41) and the first locking mechanism (51).

2. The easily foldable baby carriage frame according to claim 1, characterized in that: The baby carriage frame also includes a handle frame (6), the handle frame (6) is rotatably connected to the joint structure (5), the handle frame (6) is provided with a third locking mechanism (61) capable of locking the handle frame on the joint structure (5), a second linkage structure is also provided between the joint structure (5) and the handle frame (6), and when the first linkage structure unlocks the first locking mechanism (51), the third locking mechanism (61) is unlocked in a linkage manner, and a second switch mechanism (62) is also provided on the handle frame (6), and the second switch mechanism (62) is connected to the third locking mechanism (61) via a second pull cable (63) so that the second switch mechanism (62) can drive the third locking mechanism (61) to unlock.

3. The easily foldable baby carriage frame according to claim 2, characterized in that: The joint structure (5) comprises a front foot pivot seat (52) connected to the front foot frame (2), a rear foot pivot seat (31) connected to the rear foot frame (3), and a rotating seat (45) connected to the seat frame (4); the first locking mechanism (51) comprises a first rear foot slot (511) provided on the rear foot pivot seat (31) and opening toward the front foot pivot seat (52), a front foot slot (521) provided on the front foot pivot seat (52) and facing the opening of the first rear foot slot (511), and a first spline (53) partially located in the first rear foot slot (511) and partially located in the front foot slot (521) so as to limit the relative rotation of the front foot pivot seat (52) and the rear foot pivot seat (31).

4. The easily foldable baby carriage frame according to claim 3, characterized in that: The seat frame (4) comprises a base frame (46) and a back seat frame (47); the rotating seat (45) comprises a connecting seat (451) connected to the front foot pivot seat (52) and a first seat frame pivot seat (452) rotatably connected to the connecting seat (451); the first seat frame pivot seat (452) is connected to the back seat frame (47); a second seat frame pivot seat (471) is rotatably connected between the first seat frame pivot seat (452) and the connecting seat (451); The second locking mechanism (41) comprises a seat frame slot (472) arranged on the second seat frame pivot seat (471) and opening toward the connecting seat (451), a limit slot (473) arranged on the connecting seat (451) and facing the opening of the seat frame slot (472), and a second spline (454) partially located in the seat frame slot (472) and partially located in the limit slot (473) to limit the relative rotation of the base frame (46) and the front leg frame (2).

5. The easily foldable baby carriage frame according to claim 4, characterized in that: A first rotating member (453) is provided between the connecting seat (451) and the second spline (454); the first rotating member (453) is provided with a first inclined surface (4531) capable of pushing the second spline (454) to slide when the first rotating member (453) rotates; the first linkage structure comprises a sliding ring (44) slidably connected to the front foot pivot seat (52) and capable of pushing the first spline (53) out of the front foot slot (521); and a pushing block (4541) provided on the second spline (454) and capable of pushing the sliding ring (44).

6. The easily foldable baby carriage frame according to claim 5, characterized in that: The first switch mechanism (42) comprises a first button (421) arranged on the seat frame (4); the first cable (43) is connected between the first button (421) and the first rotating member (453) so that when the first button (421) is pressed, the first cable (43) can drive the first rotating member (453) to rotate; and a first return spring (474) capable of returning the second spline (454) is also arranged in the limit slot (473).

7. The easily foldable baby carriage frame according to claim 6, characterized in that: The handle frame (6) is connected to a handle pivot seat (64), and the third locking mechanism (61) comprises a handle slot (641) provided on the handle pivot seat (64) and opening toward the rear foot pivot seat (31), a second rear foot slot (32) provided on the rear foot pivot seat (31) and facing the opening of the handle slot (641), and a third spline (33) partially located in the handle slot (641) and partially located in the second rear foot slot (32) so as to limit the relative rotation of the handle pivot seat (64) and the rear foot pivot seat (31), a second rotating member (35) is provided in the handle slot (641), and a locking member (33) is provided between the second rotating member (35) and the third spline (33) so as to push the third spline (33) when the second rotating member (35) rotates. 3) sliding out of the second inclined surface (351) of the second rear foot slot (32), a second reset spring (34) capable of resetting the third spline (33) is also provided in the handle slot (641), the second switch mechanism (62) comprises a second button arranged on the handle frame (6), the second cable (63) is connected between the second button and the second rotating member (35) so that when the second button is pressed, the second cable (63) can drive the second rotating member (35) to rotate and push the third spline (33) out of the second rear foot slot (32), and the second linkage structure comprises a push rod (65) which is slidably connected to the rear foot pivot seat (31) and can be pushed by the sliding ring (44) to push the third spline (33) out of the second rear foot slot (32) to complete unlocking.

8. A foldable baby carriage frame according to any one of claims 3 to 7, characterized in that: The lower parts of the front tripod (2) and the rear tripod (3) are both rotatably connected to a wheel assembly (7) via a rotating shaft (70); an orientation mechanism is provided between the wheel assembly (7) and the frame body (1) and can orient the wheel assembly (7) after the handlebar frame (6) is changed in direction; the orientation mechanism comprises a rotating frame (71) connected to the wheel assembly (7); the rotating frame (71) is provided with an orientation hole (711); the lower part of the front tripod (2) is slidably connected to a wheel assembly (711) which can be inserted into the orientation hole (711) so as to A front stop pin (72) for limiting the reversal of the wheel assembly (7); a rear stop pin (73) which can be inserted into a directional hole (711) and thus limit the reversal of the wheel assembly (7) is slidably connected to the lower part of the rear foot frame (3); a first slider (74) is slidably connected to the front foot pivot seat (52); a second slider (75) is slidably connected to the rear foot pivot seat (31); a third cable (76) connecting the first slider (74) and the front stop pin (72) is provided between the first slider (74) and the front stop pin (72); and the second slider (75) is slidably connected to the front foot pivot seat (52). ) and the rear limit pin (73) are connected thereto, a fourth cable is provided between the front foot pivot seat (52) and the rear foot pivot seat (31) and a rotating ring (79) is provided which can rotate along with the handlebar pivot seat (64), the rotating ring (79) is provided with a third inclined surface (791) which pushes the first slider (74) to slide when the handlebar frame (6) is turned forward so as to release the front limit pin (72), and the rotating ring (79) is provided with a second slider (75) to slide when the handlebar frame (6) is turned backward so as to release the front limit pin (72). A fourth inclined surface (792) of the rear limit pin (73), a third return spring (77) is provided between the first slider (74) and the front leg frame (2) and is capable of resetting the first slider (74) so ​​as to pull the front limit pin (72) out of the directional hole (711) through a third cable (76), and a fourth return spring (78) is provided between the second slider (75) and the rear leg frame (3) and is capable of resetting the second slider (75) so as to pull the rear limit pin (73) out of the directional hole (711) through a fourth cable.

9. The easily foldable baby carriage frame according to claim 8, characterized in that: The front leg (2) and the rear leg (3) are both provided with a one-step double brake structure (8) capable of simultaneously braking the left and right wheel assemblies (7) of the front leg (2) or the left and right wheel assemblies (7) of the rear leg (3), the one-step double brake structure (8) comprising a brake device connected to the wheel assembly (7) and a driving mechanism for driving the brake device to brake, the brake device comprising a brake pin (714) slidably connected to the wheel assembly (7), a brake pin (714) pushed to be inserted into the wheel assembly (7) to brake The invention relates to a brake slider (713), a claw-shaped slider (712) for pushing the brake slider (713) to drive the brake pin (714), and a brake reset spring (715) for resetting the brake pin (714). The upper end of the claw-shaped slider (712) is provided with an abutment ring (7121) surrounding the outer side of the rotating shaft (70). The driving mechanism includes a top pressure block (81), a driving structure for driving the top pressure block (81) to extend and push the abutment ring (7121), and a fifth reset spring (82) for resetting the top pressure block (81).

10. The easily foldable baby carriage frame according to claim 1, characterized in that: An elastic member (9) is provided between the front leg frame (2) and the rear leg frame (3) and is capable of pulling the front leg frame (2) and the rear leg frame (3) to fold and close together when the first locking mechanism (51) is unlocked.

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