Baby carriage frame with linkage locking mechanism

Abstract

The utility model discloses a baby carriage frame with a linkage locking mechanism. The baby carriage frame comprises a frame connecting piece, a front foot rod, a rear foot rod, a push rod, a seat frame and a frame linkage assembly. A static locking part is fixedly arranged below the seat frame and opposite to the frame connecting piece, a movable locking part is arranged on the frame linkage assembly, the movable locking part and the static locking part can be connected in a locking mode, and the static locking part is configured to be separated from the movable locking part under unlocking force in the process that the push rod gets close to and is folded towards the rear foot rod. And the movable locking part moves towards the lower end of the rear foot rod under the traction of the frame linkage assembly, so that the unlocking operation of a user is convenient, time and labor are saved, and the locking is stable and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to a baby carriage technical field, especially a baby carriage frame with linkage locking mechanism. BACKGROUND

[0002] When parents take infants and young children out, they generally take a child stroller. The traditional child stroller is large in size, and the size is still large after folding, so there is a problem of inconvenient carrying. In addition, with the improvement of living standards, people's demand for travel convenience is getting higher and higher. Therefore, the operability of the child stroller when folding and the size of the child stroller after folding have become the focus of consumers. More specifically, as for the folding child stroller, the better the linkage of each component of the child stroller, the easier the folding and unfolding operation, otherwise, it is laborious to operate. As for the size of the child stroller after folding, in order to meet the carrying when taking a car or an airplane, of course, it is desirable that the size of the child stroller after folding is as small as possible; even if it is not used but stored at home, the smaller the folding size, the less the occupied space.

[0003] However, most of the existing child strollers still have the following defects:

[0004] 1. It cannot be fully folded, and the occupied volume of the child stroller after folding is still large, which is not conducive to carrying and transportation.

[0005] 2. The structure is complex, and the production cost is high.

[0006] 3. Multiple locking devices and unlocking devices are needed to perform corresponding locking and unlocking actions, which is time-consuming and laborious to operate.

[0007] 4. In the existing frame, the distance between the two front leg rods is less than the distance between the two rear leg rods before and after folding. This type of child stroller is folded between the two rear leg rods or in front of the two rear leg rods, and the distance between the two rear leg rods determines the width size after folding. This type of child stroller after folding still has the defect of not being compact enough, which also makes the packaging cost higher.

[0008] Therefore, the utility model is proposed to solve the above problems. CONTENT OF THE UTILITY MODEL

[0009] The utility model aims at overcoming the defects of the prior art, providing a baby carriage frame with linkage locking mechanism. The static locking part is separated from the dynamic locking part under the release force during the folding process of the push rod to the rear leg rod, and the dynamic locking part moves to the lower end of the rear leg rod under the traction of the carriage linkage assembly, which is convenient for the user to unlock and saves time and effort, and the locking is reliable.

[0010] The utility model discloses a child's car frame with linkage locking mechanism, child's car frame can use between the unfolded use state and the folding use state switching, including frame connecting piece 1, front leg 2, rear leg 3, push rod 4, seat frame 7 and frame linkage assembly 5, front leg 2, push rod 4 correspond with frame connecting piece 1 rotatable connection, rear leg 3 upper end is connected with frame connecting piece 1, seat frame 7 is movably connected with frame connecting piece 1, frame linkage assembly 5 is arranged between frame connecting piece 1, front leg 2, rear leg 3, push rod 4 and seat frame 7, frame linkage assembly 5 is configured as linkage front leg 2, push rod 4 rearward rear leg 3 and folds to the front and rear, and linkage seat frame 7 is folded relative to frame connecting piece 1, seat frame 7 below and relative frame connecting piece 1 fixedly be equipped with static lock stop portion 624, frame linkage assembly 5 is equipped with dynamic lock stop portion 625, dynamic lock stop portion 625 and static lock stop portion 624 can be mutually locked and connected, and static lock stop portion 624 is configured as in the process of push rod 4 to rear leg 3 and folds to the front and rear, and makes dynamic lock stop portion 625 move towards rear leg 3 lower end under the traction of frame linkage assembly 5.

[0011] As above, a child's car frame with linkage locking mechanism, rear leg 3 upper end is rotatably connected with frame connecting piece 1, frame linkage assembly 5 is configured as linkage front leg 2, push rod 4 rearward rear leg 3 and folds to the front and rear, and linkage two rear leg 3 lower end is folded to the front and rear.

[0012] As above, a child's car frame with linkage locking mechanism, front leg 2 lower end is connected with front wheel group 20, rear leg 3 lower end is connected with rear wheel group 30, when the child's car frame unfolds, the interval of two front wheel groups 20 is less than the interval of two rear wheel groups 30, frame linkage assembly 5 is configured as linkage two rear leg 3 lower end is folded to the front and rear so that two rear wheel groups 30 are folded between two front wheel groups 20.

[0013] As above, a child's car frame with linkage locking mechanism, the upper end of the front leg 2 is rotatably connected with the frame connecting piece 1 around the pivot shaft A, the upper end of the rear leg 3 is rotatably connected with the frame connecting piece 1 around the pivot shaft B which is perpendicular to the pivot shaft A, and the lower end of the push rod 4 is rotatably connected with the frame connecting piece 1 around the pivot shaft C which is parallel or coaxial with the pivot shaft A.

[0014] A baby carriage frame with linkage locking mechanism as described above, the linkage assembly 5 comprises a first linkage assembly 51 and a second linkage assembly 52; the first linkage assembly 51 is located between the rear leg 3, the push rod 4 and the seat frame 7, and is configured to link the seat frame 7 to be folded correspondingly during the folding process of the push rod 4 to the rear leg 3; the second linkage assembly 52 is located between the front leg 2, the rear leg 3 and the first linkage assembly 51, and is configured to be linked by the first linkage assembly 51 correspondingly during the folding process of the push rod 4 to the rear leg 3, and then link the front leg 2 to the rear leg 3 to be folded correspondingly and link the lower ends of the two rear legs 3 to be folded correspondingly; the dynamic locking part 625 is arranged on the second linkage assembly 52.

[0015] A baby carriage frame with linkage locking mechanism as described above, the push rod 4 comprises a lower push rod 41 and a handlebar rod 42, the lower end of the lower push rod 41 is rotatably connected with the frame connector 1, the upper end of the lower push rod 41 is rotatably connected with the lower part of the handlebar rod 42, and a handlebar locking and unlocking mechanism 61 is arranged between the handlebar rod 42 and the lower push rod 41 for locking and unlocking the handlebar rod 42 relative to the lower push rod 41; the first linkage assembly 51 comprises a first driving rod 511, a first supporting rod 512 and a first linkage rod 513, the upper end of the first driving rod 511 is rotatably connected with the lower end of the handlebar rod 42, the lower end of the first driving rod 511 is rotatably connected with the lower end of the first supporting rod 512 and the rear end of the seat frame 7, the upper end of the first supporting rod 512 is rotatably connected with the lower part of the lower push rod 41, and the lower end of the first linkage rod 513 is rotatably connected with the second linkage assembly 52 directly or indirectly through the lower end of the first driving rod 511.

[0016] A baby carriage frame with linkage locking mechanism as described above, the second linkage assembly 52 comprises a second connecting seat 521, a second linkage front rod 522 and a second linkage rear rod 523, the rear part of the second connecting seat 521 is rotatably connected with the first linkage assembly 51, the front end of the second linkage front rod 522 is rotatably connected with the front leg 2, the rear end of the second linkage front rod 522 is rotatably connected with the front part of the second connecting seat 521, one end of the second linkage rear rod 523 is rotatably connected with the rear leg 3, and the other end of the second linkage rear rod 523 is rotatably connected with the side part of the second connecting seat 521; the dynamic locking part 625 is arranged on the second connecting seat 521.

[0017] A baby carriage frame with linkage locking mechanism as described above, further comprising a handrail rod 8, which is connected with the first linkage assembly 51 and is configured to be folded correspondingly during the folding process of the push rod 4 to the rear leg 3.

[0018] The child stroller frame with the linkage locking mechanism, the push rod 4 comprises a lower push rod 41 and a handle rod 42, the lower push rod 41 is rotatably connected with the frame connecting piece 1 at the lower end, the lower push rod 41 is rotatably connected with the lower part of the handle rod 42 at the upper end, and the handle rod locking and unlocking mechanism 61 for locking the handle rod 42 relative to the lower push rod 41 is arranged between the handle rod 42 and the lower push rod 41; the static locking part 624 is arranged to be separated from the dynamic locking part 625 under the releasing force in the folding process when the handle rod locking and unlocking mechanism 61 releases the locking state of the lower push rod 41 and the handle rod 42.

[0019] The child stroller frame with the linkage locking mechanism, the two frame connecting pieces 1 are connected through the frame cross rod 11; the static locking part 624 is arranged on the frame cross rod 11; the second locking clamping hook 621 is arranged on the dynamic locking part 625, the locking clamping hole 6241 is arranged on the static locking part 624, the second locking block 622 for locking the second locking clamping hook 621 inserted into the locking clamping hole 6241 is arranged on the side of the locking clamping hole 6241, and the second locking block 622 is arranged to be released in linkage in the folding process of the push rod 4 to the rear foot rod 3.

[0020] The child stroller frame with the linkage locking mechanism, the seat frame 7 is rotatably and slidably connected with the frame connecting piece 1, and the frame linkage assembly 5 is arranged to slide and overturn the seat frame 7 rearward in linkage in the folding process of the push rod 4 to the rear foot rod 3, so that the front part of the seat frame 7 is not protruded on the upper surface of the frame connecting piece 1.

[0021] Compared with the prior art, the child stroller frame with the linkage locking mechanism has the following advantages:

[0022] 1. In the folding process, the handle rod locking and unlocking mechanism is only needed to be operated to release the locking state of the handle rod relative to the lower push rod, then the handle rod is operated to be folded to the preset position or the preset angle relative to the lower push rod to release the locking state between the dynamic locking part and the static locking part, and the child stroller frame can be folded correspondingly, so that the child stroller frame with the linkage locking mechanism only needs to be manually operated to release the locking state of the handle rod locking and unlocking mechanism, and the user can conveniently release the locking state, and time and labor are saved.

[0023] 2. In order to further make the overall structure of the folded child stroller frame more compact, the two rear wheel groups are arranged between the inner sides of the two front wheel groups after the child stroller frame is folded, so that the thickness size of the packaging box is reduced.

[0024] 3、The lower push rod, the handlebar rod, the first driving rod and the first supporting rod are connected to form a four-bar linkage mechanism, the lower push rod, the frame connecting piece, the seat frame and the first supporting rod are connected to form a four-bar linkage mechanism, the first supporting rod is used as a common side of the two four-bar linkage mechanisms, so that the other four-bar linkage mechanism is locked and unlocked correspondingly by controlling the four-bar linkage mechanism of the handlebar rod, and the structure design is reasonable and the linkage is smooth.

[0025] 4、The linkage seat frame slides and overturns to fold in the folding process of the push rod to the rear foot rod, so that the front part of the seat frame is not protruded on the upper surface of the frame connecting piece, which is beneficial to make the height direction of the folded child bicycle more compact, and is beneficial to reduce the height size of the packaging box. BRIEF DESCRIPTION OF DRAWINGS

[0026] The specific embodiments of the utility model will be further described in detail below in combination with the drawings, wherein:

[0027] Figure 1 It is one of the three-dimensional structure schematic diagrams of the utility model in the unfolded use state.

[0028] Figure 2 It is the second three-dimensional structure schematic diagram of the utility model in the unfolded use state.

[0029] Figure 3 It is the third three-dimensional structure schematic diagram of the utility model in the unfolded use state.

[0030] Figure 4 It is the side view structure schematic diagram of the utility model in the unfolded use state.

[0031] Figure 5 It is one of the three-dimensional structure schematic diagrams of the utility model in the folding process.

[0032] Figure 6 It is the second three-dimensional structure schematic diagram of the utility model in the folding process.

[0033] Figure 7 It is the side view structure schematic diagram of the utility model in the folding process.

[0034] Figure 8 It is the side view structure schematic diagram of the utility model in the folded use state.

[0035] Figure 9 It is the sectional view structure schematic diagram of the utility model.

[0036] Figure 10 It is one of the exploded structure schematic diagrams of the utility model.

[0037] Figure 11 It is the second exploded structure schematic diagram of the utility model.

[0038] Figure 12 This is the third schematic diagram of the exploded structure of this utility model.

[0039] Figure 13 This is the fourth schematic diagram of the exploded structure of this utility model.

Detailed Implementation Methods

[0040] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0041] like Figures 1-13 As shown, this utility model discloses a stroller frame with a linkage locking mechanism. The stroller frame can be switched between an unfolded and folded use state. It includes a frame connector 1, front leg rods 2, rear leg rods 3, push rods 4, a seat frame 7, and a frame linkage assembly 5. The front leg rods 2 and push rods 4 are rotatably connected to the frame connector 1, the upper end of the rear leg rod 3 is connected to the frame connector 1, and the seat frame 7 is movably connected to the frame connector 1. The frame linkage assembly 5 is disposed between the frame connector 1, the front leg rods 2, the rear leg rods 3, the push rods 4, and the seat frame 7. The frame linkage assembly 5 is equipped with... The front leg bar 2 and push rod 4 are folded together and moved towards the rear leg bar 3, and the seat frame 7 is folded relative to the frame connector 1. A static locking part 624 is fixedly provided below the seat frame 7 and relative to the frame connector 1. A dynamic locking part 625 is provided on the frame linkage assembly 5. The dynamic locking part 625 and the static locking part 624 can be locked together. The static locking part 624 is configured to be released by a release force during the process of the push rod 4 folding towards the rear leg bar 3, and the dynamic locking part 625 moves towards the lower end of the rear leg bar 3 under the traction of the frame linkage assembly 5. In the folding process, this invention only requires operating the handlebar locking and unlocking mechanism to release the locking state of the handlebar relative to the downward push rod. Then, operating the handlebar relative to the downward push rod to fold to a preset position or preset angle will trigger the unlocking action between the static locking part and the dynamic locking part, thereby releasing the locking state between the dynamic locking part and the static locking part. At this time, the stroller frame can be folded accordingly. Therefore, this invention only requires manual operation of one set of handlebar locking and unlocking mechanisms, which is convenient for users to unlock, saves time and effort, and ensures stable and reliable locking.

[0042] like Figure 10 As shown, in order to make the overall structure of the stroller frame more compact after folding, the upper end of the rear leg bar 3 is rotatably connected to the frame connector 1, and the frame linkage assembly 5 is configured to link the front leg bar 2 and the push rod 4 to fold towards the rear leg bar 3, and to link the lower ends of the two rear leg bars 3 to move towards each other.

[0043] like Figure 10As shown, the front leg rod 2 lower end is connected with front wheel set 20, the rear leg rod 3 lower end is connected with rear wheel set 30, the stroller frame is unfolded, and the distance between the two front wheel sets 20 is less than the distance between the two rear wheel sets 30, and the frame linkage assembly 5 is configured to link the lower ends of the two rear leg rods 3 to move towards each other so that the two rear wheel sets 30 are folded between the two front wheel sets 20, thereby facilitating the reduction of the thickness size of the packaging box.

[0044] In the utility model, the frame linkage assembly cooperates with the corresponding folding actions of the front leg rod, the seat frame and the two rear leg rods during the folding process of the lower push rod towards the rear leg rod 3, realizes the function of one-key folding of the stroller, and simultaneously cooperates with the corresponding unfolding actions of the front leg rod, the seat frame and the two rear leg rods during the unfolding process of the lower push rod rotating away from the rear leg rod 3, and the unfolding is convenient and efficient.

[0045] As shown in Figures 1-8 In order to fold efficiently and stably and realize folding in multiple directions, the upper end of the front leg rod 2 is rotatably connected with the frame connecting piece 1 around the pivot shaft A, the upper end of the rear leg rod 3 is rotatably connected with the frame connecting piece 1 around the pivot shaft B perpendicular to the pivot shaft A, and the lower end of the push rod 4 is rotatably connected with the frame connecting piece 1 around the pivot shaft C parallel or coaxial with the pivot shaft A.

[0046] As shown in Figures 1-8 , 11, 13, in order to link conveniently and efficiently, the frame linkage assembly 5 includes a first linkage assembly 51 and a second linkage assembly 52, the first linkage assembly 51 is located between the rear leg rod 3, the push rod 4 and the seat frame 7, the first linkage assembly 51 is configured to link the corresponding folding of the seat frame 7 during the folding process of the push rod 4 towards the rear leg rod 3, the second linkage assembly 52 is located between the front leg rod 2, the rear leg rod 3 and the first linkage assembly 51, the second linkage assembly 52 is configured to be linked by the first linkage assembly 51 during the folding process of the push rod 4 towards the rear leg rod 3, and then link the folding of the front leg rod 2 towards the rear leg rod 3 and the folding of the lower ends of the two rear leg rods 3 towards each other, and the movable locking part 625 is arranged on the second linkage assembly 52.

[0047] As shown in Figures 1-8,11,13, in order to linkage reliable, the first linkage assembly 51 includes first drive rod 511, first support rod 512 and first linkage rod 513, the first drive rod 511 upper end and handlebar 42 lower end rotatable connection, the first drive rod 511 lower end and first support rod 512 lower end and seat frame 7 rear end rotatable connection, the first support rod 512 upper end and push rod 41 lower part rotatable connection, the first linkage rod 513 upper end directly or indirectly with the first drive rod 511 lower end rotatable connection, the first linkage rod 513 lower end and second linkage assembly 52 rotatable connection, the push rod 41, handlebar 42, first drive rod 511 and first support rod 512 between connection constitutes four connecting rod mechanism, the push rod 41, frame connecting piece 1, seat frame 7 and first support rod 512 between connection constitutes four connecting rod mechanism; First support rod 512 is the public side of two four connecting rod mechanism, so when the handlebar 42 four connecting rod mechanism is locked, the folding of the stroller frame in the front and rear direction is limited. As Figure 1 、 11 ,13, the first drive rod 511 lower end and linkage cross rod 510 rotatable connection, first support rod 512 lower end and first linkage rod 513 upper end are opposite fixed connection with linkage cross rod 510, seat frame 7 rear end and linkage cross rod 510 rotatable connection.

[0048] As Figures 1-8 ,11,13, in order to linkage reliable, the second linkage assembly 52 includes second connecting seat 521, second linkage front rod 522 and second linkage rear rod 523, the second connecting seat 521 rear part and first linkage assembly 51 rotatable connection, the second linkage front rod 522 front end and front leg rod 2 rotatable connection, the second linkage front rod 522 rear end and second connecting seat 521 front rotatable connection, the second linkage rear rod 523 one end and rear leg rod 3 rotatable connection, the second linkage rear rod 523 the other end and second connecting seat 521 side rotatable connection; The dynamic locking portion 625 is arranged on the second connecting seat 521.

[0049] In order to collect and expand conveniently, it also includes handrail 8, the handrail 8 and first linkage assembly 51 are connected and configured to be cooperatively linked in the process of push rod 4 to rear leg rod 3 close folding. As Figure 1 The first support rod 512 upper end extends upward and forms a handrail connecting portion for connecting with the handrail 8.

[0050] In order to make the stroller frame structure more compact after folding, the push rod 4 comprises a lower push rod 41 and a handlebar rod 42, the lower end of the lower push rod 41 is rotatably connected with the frame connecting piece 1, the upper end of the lower push rod 41 is rotatably connected with the lower part of the handlebar rod 42, and a handlebar rod locking and unlocking mechanism 61 is arranged between the handlebar rod 42 and the lower push rod 41 for locking the handlebar rod 42 relative to the lower push rod 41; the static locking part 624 is configured to be released by the unlocking force during the folding process when the handlebar rod locking and unlocking mechanism 61 releases the locking state of the lower push rod 41 and the handlebar rod 42, so that the static locking part 624 and the dynamic locking part 625 are separated from each other. The handlebar rod locking and unlocking mechanism 61 can also lock and unlock the push rod 4 relative to the frame connecting piece 1 in some embodiments.

[0051] As shown in Figure 1 , 2 , the handlebar rod locking and unlocking mechanism 61 comprises a handlebar rod locking mechanism arranged between the handlebar rod 42 and the lower push rod 41 for locking the handlebar rod 42 relative to the lower push rod 41, and a handlebar rod unlocking mechanism arranged on the handlebar rod 42 for linkage with the unlocking action of the handlebar rod locking mechanism. The structure of the handlebar rod locking mechanism and the handlebar rod unlocking mechanism in this embodiment can adopt the stroller frame and the stroller of application No. 201921212228.1 and the locking and unlocking mechanism of the stroller of application No. 201921479323.8, which will not be described here.

[0052] As shown in Figure 9 , 10 , in order to lock reliably, the two frame connecting pieces 1 are connected by a frame cross rod 11; the static locking part 624 is arranged on the frame cross rod 11; the dynamic locking part 625 is provided with a second locking hook 621, the static locking part 624 is provided with a locking eye 6241, the side of the locking eye 6241 is provided with a second locking block 622 for locking the second locking hook 621 inserted into the locking eye 6241, the second locking block 622 is configured to be linked and released during the folding process of the push rod 4 moving towards the rear leg 3, and the static locking part 624 is provided with a second elastic reset member 623 for driving the elastic reset of the second locking block 622. In this embodiment, the second locking block 622 and the lower end of the handlebar rod 42 are connected by an unlocking pull rope, the lower end of the unlocking pull rope is connected with the second locking block 622, and the upper end of the unlocking pull rope is connected with the lower end of the handlebar rod 42.

[0053] As shown in Figure 8 , the seat frame 7 is rotatably and slidably connected with the frame connecting piece 1, and the frame linkage assembly 5 links the rearward sliding and folding of the seat frame 7 during the folding process of the push rod 4 moving towards the rear leg 3, so that the front part of the seat frame 7 does not protrude from the upper surface of the frame connecting piece 1, which is beneficial to make the height direction of the stroller frame more compact after folding, and is beneficial to reduce the height size of the packaging box.

[0054] As Figure 1 , 2 shown, a guiding sliding mechanism is provided between the side of the seat part 7 and the frame connecting part 1, which includes a guiding sliding groove 71 provided on the side of the seat part 7 and extending along the front and back direction of the seat part 7, and a guiding pivot 12 provided on the frame connecting part 1 and placed in the guiding sliding groove 61. Figure 1 As

[0055] As Figures 1-8 shown, when folding, the unlocking action of the handlebar lever unlocking mechanism is operated to unlock the handlebar lever locking mechanism to release the locked state of the handlebar lever 42 relative to the push lever 41, and then the handlebar lever 42 is turned forward relative to the push lever 41 to fold towards the side of the push lever 41. During the above-mentioned folding of the handlebar lever 42, the handlebar lever 41 is unlocked by the unlocking action of the second locking block 622 through the unlocking cable to separate the second locking block 622 from the second locking catch 621 to release the locked state between the static locking part 624 and the dynamic locking part 625, and further release the locked state of the second linkage assembly 52 relative to the frame connecting part 1. Then the push lever 41 is folded towards the side of the rear leg 2, the seat part 7 is slid and turned backwards relative to the frame connecting part 1 through the first driving lever 511, the first supporting lever 512, and the first linkage lever 513 drives the second connecting seat 521 to move the rear end of the second linkage front lever 522 and one end of the two second linkage rear levers 523 downwards, so that the front leg 1 is turned backwards to fold towards the side of the rear leg, and the two rear legs 2 are folded towards each other, until the folding of the whole stroller frame is completed, as Figure 8 shown.

Claims

1. A stroller frame having a linked locking mechanism, the stroller frame being switchable between an unfolded, in-use condition and a folded, in-use condition, characterised in that The child bicycle frame comprises a frame connecting piece (1), a front leg rod (2), a rear leg rod (3), a push rod (4), a seat frame (7) and a frame linkage assembly (5); The front leg rod (2) and the push rod (4) are rotatably connected with the frame connecting piece (1), the upper end of the rear leg rod (3) is connected with the frame connecting piece (1), and the seat frame (7) is movably connected with the frame connecting piece (1); The frame linkage assembly (5) is arranged between the frame connecting piece (1), the front leg rod (2), the rear leg rod (3), the push rod (4) and the seat frame (7), and is configured to fold the front leg rod (2) and the push rod (4) towards the rear leg rod (3) and fold the seat frame (7) relative to the frame connecting piece (1); A static locking part (624) is fixedly arranged below the seat frame (7) and relative to the frame connecting piece (1), a dynamic locking part (625) is arranged on the frame linkage assembly (5), the dynamic locking part (625) and the static locking part (624) are lockingly connected with each other, and the static locking part (624) is configured to be separated from the dynamic locking part (625) under the release force during the folding of the push rod (4) towards the rear leg rod (3), and the dynamic locking part (625) is moved towards the lower end of the rear leg rod (3) under the traction of the frame linkage assembly (5).

2. The stroller frame with interlocking locking mechanism of claim 1, wherein The upper end of the rear leg rod (3) is rotatably connected with the frame connecting piece (1), and the frame linkage assembly (5) is configured to fold the front leg rod (2) and the push rod (4) towards the rear leg rod (3) and fold the lower ends of the two rear leg rods (3) towards each other.

3. The stroller frame with interlocking locking mechanism of claim 2, wherein The lower end of the front leg rod (2) is connected with a front wheel set (20), the lower end of the rear leg rod (3) is connected with a rear wheel set (30), the distance between the two front wheel sets (20) is smaller than the distance between the two rear wheel sets (30) when the child bicycle frame is unfolded, and the frame linkage assembly (5) is configured to fold the two rear wheel sets (30) between the two front wheel sets (20) by folding the lower ends of the two rear leg rods (3) towards each other.

4. The stroller frame with interlocking locking mechanism of claim 2, wherein The frame linkage assembly (5) comprises a first linkage assembly (51) and a second linkage assembly (52); The first linkage assembly (51) is arranged between the rear leg rod (3), the push rod (4) and the seat frame (7), and is configured to fold the seat frame (7) during the folding of the push rod (4) towards the rear leg rod (3); The second linkage assembly (52) is arranged between the front leg rod (2), the rear leg rod (3) and the first linkage assembly (51), and is configured to be folded by the first linkage assembly (51) during the folding of the push rod (4) towards the rear leg rod (3), so as to fold the front leg rod (2) towards the rear leg rod (3) and fold the lower ends of the two rear leg rods (3) towards each other; The dynamic locking part (625) is arranged on the second linkage assembly (52).

5. The stroller frame with interlocking locking mechanism of claim 4, wherein The push rod (4) comprises a lower push rod (41) and a handlebar rod (42), the lower end of the lower push rod (41) is rotatably connected with the frame connector (1), the upper end of the lower push rod (41) is rotatably connected with the lower part of the handlebar rod (42), and a handlebar rod locking and unlocking mechanism (61) for locking the handlebar rod (42) relative to the lower push rod (41) is arranged between the handlebar rod (42) and the lower push rod (41); the first linkage assembly (51) comprises a first driving rod (511), a first supporting rod (512) and a first linkage rod (513), the upper end of the first driving rod (511) is rotatably connected with the lower end of the handlebar rod (42), the lower end of the first driving rod (511) is rotatably connected with the lower end of the first supporting rod (512) and the rear end of the seat frame (7), the upper end of the first supporting rod (512) is rotatably connected with the lower part of the lower push rod (41), and the upper end of the first linkage rod (513) is directly or indirectly rotatably connected with the lower end of the first driving rod (511), and the lower end of the first linkage rod (513) is rotatably connected with the second linkage assembly (52).

6. The stroller frame with interlocking locking mechanism of claim 4, wherein The second linkage assembly (52) comprises a second connecting seat (521), a second linkage front rod (522) and a second linkage rear rod (523), the rear part of the second connecting seat (521) is rotatably connected with the first linkage assembly (51), the front end of the second linkage front rod (522) is rotatably connected with the front leg rod (2), the rear end of the second linkage front rod (522) is rotatably connected with the front part of the second connecting seat (521), one end of the second linkage rear rod (523) is rotatably connected with the rear leg rod (3), and the other end of the second linkage rear rod (523) is rotatably connected with the side part of the second connecting seat (521); the dynamic locking part (625) is arranged on the second connecting seat (521).

7. The stroller frame with interlocking locking mechanism of claim 4, wherein The handrail rod (8) is connected with the first linkage assembly (51) and is configured to be cooperatively folded during the folding of the push rod (4) to the rear leg rod (3).

8. The stroller frame with interlocking mechanism of any of claims 1-7, wherein The push rod (4) comprises a lower push rod (41) and a handlebar rod (42), the lower end of the lower push rod (41) is rotatably connected with the frame connector (1), the upper end of the lower push rod (41) is rotatably connected with the lower part of the handlebar rod (42), and a handlebar rod locking and unlocking mechanism (61) for locking the handlebar rod (42) relative to the lower push rod (41) is arranged between the handlebar rod (42) and the lower push rod (41); the static locking part (624) is configured to be released by the release force during the unlocking of the handlebar rod locking and unlocking mechanism (61) and the folding of the lower push rod (41) and the handlebar rod (42), so that the static locking part (624) and the dynamic locking part (625) are separated from each other.

9. The stroller frame with interlocking locking mechanism of claim 1, wherein Two said frame connectors (1) are connected by a frame cross bar (11); the static locking part (624) is arranged on the frame cross bar (11); the dynamic locking part (625) is provided with a second locking hook (621), and the static locking part (624) is provided with a locking socket (6241); the side of the locking socket (6241) is provided with a second locking block (622) for locking the second locking hook (621) inserted into the locking socket (6241); and the second locking block (622) is configured to be unlocked in linkage during the folding process of the push rod (4) to the rear foot rod (3).

10. The stroller frame with interlocking locking mechanism of claim 1, wherein The seat frame (7) is rotatably and slidably connected with the frame connector (1), and the frame linkage assembly (5) links the seat frame (7) to slide and overturn and fold backward during the folding process of the push rod (4) to the rear foot rod (3), so that the front part of the seat frame (7) does not protrude from the upper surface of the frame connector (1).

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