CN113734265B - Children's barrow - Google Patents

Abstract

The invention discloses a children's stroller, which comprises a vehicle frame and a seat device arranged on the vehicle frame. The vehicle frame includes a bottom bracket and a push rod frame. On the bracket, the seat device has a forward use state and a backward use state. In the unfolded state, the push rod frame has an open state and a stowed state. The bottom bracket extends upwards and tilts backwards, and the push rod frame is located at the rear of the seat device; in the stowed state, the push rod frame is folded behind the bottom bracket, and the seat device can rotate around the center line of rotation and is in the forward use state and the rear To transition between states of use. When the orientation is changed, the push rod frame does not interfere with the seat device or interfere with the child's legs, and the seat device can be rotated between the forward and backward use states, so that the child can switch directions without getting off the car, and the operation The steps are simple and convenient.

Description

stroller

technical field

The invention relates to a stroller for children.

Background technique

On some existing children's strollers, the seat device can be switched between the forward setting and the rearward setting. However, due to the interference of the push rod frame on the seat device, when changing the orientation of the seat device, it is necessary to first move the seat device from After removing the seat device from the frame, adjusting the direction of the seat device, and then installing the seat device to the frame, it is usually necessary to carry the child out of the car before the operation can be completed, and there are many steps in the reversing operation, which is inconvenient to operate.

Contents of the invention

The object of the present invention is to provide a new type of stroller for children, so that the reversing operation of the seat device can be realized without getting off the stroller.

In order to achieve the above object, the technical solution adopted by the present invention is: a children's stroller, including a vehicle frame in an unfolded state, a seat device arranged on the vehicle frame, the vehicle frame includes a bottom bracket, a lower part and the The bottom bracket is rotatably connected to the push rod frame, and the seat device is rotatably arranged on the bottom bracket around the rotation center line extending in the up-down direction, and the seat device has a forward-facing use state and a rear-facing In the backward use state, the vehicle frame is in the unfolded state, and the push rod frame has an open state and a retracted state. When the push rod frame is in the open state, the push rod frame is upward from the bottom bracket and Extending obliquely backward, and the push rod frame is located at the rear of the seat device; when the push rod frame is in a retracted state, the push rod frame is folded behind the bottom bracket, and the seat device can Rotation about the rotational centerline transitions between the forward in-use configuration and the rearward in-use configuration.

Preferably, the push rod frame includes an upper push rod and a lower push rod that can be folded along the length direction, the lower push rod is rotatably connected with the bottom bracket around a first axis, the lower push rod is connected with the A first locking mechanism for locking the push rod frame in the open state is provided between the bottom brackets, and a first locking mechanism is provided on the frame when the upper push rod is folded relative to the lower push rod The middle linkage makes the first locking mechanism transition from a locked state to an unlocked state.

Further, the first locking mechanism includes a locking piece that can be relatively slidably arranged at the bottom of the lower push rod along the extending direction of the length of the lower push rod, and is arranged on the bottom bracket and can be connected with the locking piece. The matching structure, the locking part has a locking position and an unlocking position on the lower push rod, when the locking part is in the locking position, the locking part cooperates with the matching structure, the The first locking mechanism is in a locked state; when the locking member is in the unlocked position, the locking member is disengaged from the matching structure, the first locking mechanism is in an unlocked state, and the linkage mechanism has at least a linkage In the process of retracting the upper push rod relative to the lower push rod, the linkage member cooperates with the locking member so that the locking member moves from the locking position to the unlocking position.

Further, the locking member includes a slider, and more than one lock bar arranged on the slider, the length extension direction of the lock bar is parallel to the axis line of the first shaft, and the matching structure It includes more than one lock grooves arranged on the bottom bracket, and an arc-shaped groove that communicates with the lock grooves and can provide sliding guidance for the lock rod is also provided on the bottom bracket. The first axis is the center line of rotation. When the locking member is in the locking position, the locking rod is correspondingly inserted into the locking groove; when the locking member is in the unlocking position, the The lock bar is disengaged from the lock slot and is slidably located in the arc-shaped slot.

Further, the locking position is located above the unlocking position, and an elastic member is provided between the bottom bracket and the locking member to provide the force required for the locking member to move toward the locking position.

Further, the locking position is located above the unlocking position, the lower part of the upper push rod is rotationally connected with the upper part of the lower push rod around a second axis, and the linkage can be relatively slidably arranged in the up and down direction. In the lower push rod, the lower part of the upper push rod has a cam surface, and the linkage member abuts between the cam surface and the locking member along the vertical direction.

Furthermore, the locking position is located above the unlocking position, the upper push rod is relatively slidably inserted into the lower push rod, and the linkage is fixed at the lower end of the upper push rod or It is integrally formed on the lower end of the upper push rod, and the linkage piece is located above the locking piece.

Further, the lower part of the upper push rod is rotatably connected with the upper part of the lower push rod around the second axis, and the upper part of the upper push rod is provided with a handle for holding. When the push rod frame is in the In the stowed state, the lower push rod and the upper push rod are sequentially folded behind the bottom bracket along the front and rear directions, and the handle is arranged facing upward.

Preferably, the seat device includes a base with a load-bearing surface, the base is supported on the bottom bracket and is rotatably connected with the bottom bracket around the rotation center line, when the push rod frame is in the retracted position In the raised state, the push rod frame is not higher than the bearing surface in the up and down direction.

As a preferred embodiment, the bottom bracket includes a front bracket with a front wheel assembly at the bottom, a rear bracket with a rear wheel assembly at the bottom, a seat frame arranged on the front bracket, and a seat frame connected to the front bracket. , a link assembly between the rear bracket and the seat frame, and a second locking mechanism for locking the bottom bracket in an unfolded state, wherein the upper portion of the front bracket and the upper portion of the rear bracket rotate ground connection, the rear part of the seat frame is rotatably connected to the upper part of the front frame, and the push rod frame is in the process of switching between the open state and the stowed state, and the second locking mechanism remains in the In locked state.

Due to the application of the above-mentioned technical solution, the present invention has the following advantages compared with the prior art: when the seat device is turned towards, the push rod frame on the children's stroller of the present invention is folded behind the bottom bracket, and does not interfere with the seat device , and will not interfere with the legs of children sitting on the seat device, the seat device can be rotated around the rotation center line extending in the up and down direction to switch between the forward use state and the rear use state, so that children can not get down The car can be reversed and operated, and the operation steps are simple and convenient.

Description of drawings

Accompanying drawing 1 is the schematic side view of the children's stroller of the present invention when it is in the forward use state (Embodiment 1);

Accompanying drawing 2 is the longitudinal sectional schematic diagram (Embodiment 1) of the present invention when the children's stroller is in the forward use state;

Accompanying drawing 3 is a partially enlarged schematic diagram of a children's stroller of the present invention corresponding to position A in accompanying drawing 2 (embodiment 1);

Accompanying drawing 4 is the side view schematic diagram 1 (embodiment 1) of the children's stroller in the transition process from the forward use state to the backward use state;

Accompanying drawing 5 is the schematic diagram of the longitudinal section of the children's stroller in the process of transition from the forward use state to the backward use state (Embodiment 1);

Accompanying drawing 6 is the partially enlarged schematic view of the children's stroller of the present invention corresponding to the position B in the accompanying drawing 5;

Accompanying drawing 7 is the side view schematic diagram 2 (Embodiment 1) of the present invention during the transition from the forward use state to the backward use state of the children's stroller;

Accompanying drawing 8 is the side view schematic diagram 3 (Embodiment 1) of the children's stroller in the process of transitioning from the forward use state to the backward use state;

Accompanying drawing 9 is a longitudinal sectional schematic diagram (embodiment 2) of the push rod frame in the opened state in the children's stroller of the present invention, wherein the first locking member is in the locked state;

Accompanying drawing 10 is a longitudinal sectional schematic diagram 1 (embodiment 2) of the push rod frame in the children's stroller in the transition process from the open state to the stowed state (embodiment 2), wherein the first locking member is in the unlocked state;

Accompanying drawing 11 is the longitudinal section schematic diagram II (embodiment 2) of the push rod frame in the children's stroller in the transition process from the open state to the stowed state (embodiment 2), wherein the first locking member is in the unlocked state;

in:

100, vehicle frame; 101, bottom bracket; 102, push rod frame;

1. Front bracket; 2. Rear bracket; 21. Arc groove; 3. Seat frame;

4. Connecting rod assembly; 41. Front connecting rod; 42. Side connecting rod; 43. Sliding sleeve;

51. Up push rod; 52. Down push rod; 53. Grip;

6. The first locking mechanism; 61, the locking piece; 61a, the slider; 61b, the locking lever; 62, the matching structure; 62a, the locking groove;

7. Linkage mechanism; 71. Linkage piece;

200, seat device; 201, base; 201a, bearing surface; 202, backrest; 203, armrest frame;

300, front wheel assembly; 400, rear wheel assembly;

a, centerline of rotation; b, first axis; c, second axis.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Embodiment one

A kind of children's stroller, referring to Fig. 1 and Fig. 2, comprises a vehicle frame 100 in an unfolded state, a seat device 200 arranged on the vehicle frame 100, the vehicle frame 100 includes a bottom bracket 101, and the lower part is rotatably connected with the bottom bracket 101. The connected push rod frame 102 and the seat device 200 are provided on the bottom frame 101 so as to be rotatable around a rotation center line a extending in the vertical direction.

Specifically, the bottom bracket 101 includes a front bracket 1 with a front wheel assembly 300 at the bottom, a rear bracket 2 with a rear wheel assembly 400 at the bottom, a seat frame 3 arranged on the front bracket 1, connected to the front bracket 1, and a rear bracket. 2 and the link assembly 4 between the seat frame 3, wherein the front bracket 1 extends obliquely from front to back, the rear bracket 2 extends obliquely from back to front, and the upper part of the front bracket 1 and the upper part of the rear bracket 2 rotate ground connection, the rear portion of the seat frame 3 is rotationally connected to the top of the front support 1. The connecting rod assembly 4 includes a front connecting rod 41 extending in the vertical direction, a side connecting rod 42 extending in the front-rear direction, and a sliding sleeve 43 slidably sleeved on the front support 1 along the length extension direction of the front strut 1 . The front link 41 is rotatably connected between the seat frame 3 and the sliding sleeve 43, the side link 42 is rotatably connected between the sliding sleeve 43 and the rear bracket 2, and the bottom of the front link 41 is connected to the front of the side link 42. The parts are connected to the sliding sleeve 43 so as to rotate around the same rotation center line. The rotational connection between the front link 41 and the seat frame 3 is located in front of the rotational connection between the seat frame 3 and the front bracket 1 in the length direction of the seat frame 3 . The seat device 200 is provided on the seat frame 3 so as to be rotatable about a rotation center line a extending in the vertical direction. In this embodiment, the lower part of the push rod frame 102, the upper part of the front bracket 1, and the upper part of the rear bracket 2 are rotatably connected together around the first axis b.

The push rod frame 102 has an open state and a retracted state. When the push rod frame 102 is in the open state, the push rod frame 102 extends upward and backward from the bottom bracket 101, and the push rod frame 102 is located behind the seat device 200; When the push rod frame 102 is in a retracted state, the push rod frame 102 is folded behind the bottom bracket 101 . Specifically, the push rod frame 102 includes an upper push rod 51 and a lower push rod 52 that can be folded along the length direction, and a handle 53 provided on the upper part of the upper push rod 51 for gripping. Wherein, the bottom of the upper push rod 51 is rotationally connected with the upper second axis c of the lower push rod 52, and the bottom of the lower push rod 52, the upper part of the front bracket 1, and the upper part of the rear bracket 2 rotate around the first axis b ground connection. When the push rod frame 102 is in an open state, as shown in FIG. 1 and FIG. 2 , both the upper push rod 51 and the lower push rod 52 extend obliquely upward from front to back, and both extend substantially along the same length direction. When the push rod holder 102 is converted from the open state to the retracted state, as shown in Fig. 4 and Fig. 5, the upper push rod 51 rotates counterclockwise around the second axis c, and the upper push rod 51 is opposite to the lower push rod 52 When retracted, the lower push rod 52 rotates clockwise downward around the first axis b.

Referring to Figures 1 to 6, a first locking mechanism 6 for locking the push rod frame 102 in an open state is provided between the lower push rod 52 and the bottom bracket 101, and the upper push rod is also provided on the vehicle frame 100. 51 is the linkage mechanism 7 that is linked to make the first locking mechanism 6 change from the locked state to the unlocked state during the process of folding relative to the lower push rod 52 .

Specifically, the first locking mechanism 6 includes a locking member 61 that is relatively slidably disposed on the bottom of the lower push rod 52 along the length extension direction of the lower push rod 52 , and a locking member 61 that is arranged on the bottom bracket 101 and can cooperate with the locking member 61 . structure62. The locking member 61 includes a sliding block 61a, and more than one locking bar 61b arranged on the sliding block 61a, and the length extension direction of each locking bar 61b is parallel to the axis line of the first shaft b. The matching structure 62 includes more than one locking groove 62a disposed on the bottom bracket 101 . In this embodiment, there are two locking bars 61b and they are both arranged at the lower part of the sliding block 61a. There are two locking slots 62a and the two locking slots 62a correspond to the positions of the two locking bars 61b one by one. The upper part of the rear bracket 2 is also provided with an arc-shaped groove 21 that communicates with the lock groove 62a and can provide a sliding guide for the lock rod 61b. The arc-shaped groove 21 takes the first axis b as the center line of rotation. The outer side of the groove 21. The locking member 61 has a locking position and an unlocking position on the lower push rod 52. When the locking member 61 is in the locking position, the two locking rods 61b are inserted into the locking groove 62a in a one-to-one correspondence. At this time, the first locking mechanism 6 It is in the locked state; when the locking member 61 is in the unlocked position, the locking bar 61b breaks away from the lock groove 62a and is slidably located in the arc groove 21 , at this moment, the first locking mechanism 6 is in the unlocked state.

The linkage mechanism 7 has at least a linkage piece 71 , and when the upper push rod 51 is retracted relative to the lower push rod 52 , the linkage piece 71 cooperates with the locking piece 61 so that the locking piece 61 moves from the locking position to the unlocking position. Specifically in this embodiment, the locking position of the locking member 61 is located above the unlocking position, and the linkage member 71 is arranged in the rod chamber of the lower push rod 52 so as to be relatively slidable in the up and down direction, and the lower part of the upper push rod 51 has a cam surface 51a , the linkage piece 71 abuts against between the cam surface 51 a and the locking piece 61 in the up-down direction. When the upper push rod 51 is folded relative to the lower push rod 52, the upper push rod 51 rotates counterclockwise around the second axis c, and the upper push rod 51 drives the cam surface 51a to rotate, and the cam surface 51a further pushes the linkage 71 Sliding downward along the length extension direction of the lower push rod 52 , the sliding block 61 a is driven to slide downward, and the locking rod 61 b disposed at the lower part of the sliding block 61 a gradually slides from the locking groove 62 a into the arc groove 21 .

An elastic member (not shown in the figure) is provided between the bottom bracket 101 and the slider 61a to provide the required force for the slider 61a to move toward the locked position. In this embodiment, when the push rod frame 102 is converted from the stowed state to the open state, when the lock bar 61b slides to the junction of the arc groove 21 and the lock groove 62a, the elastic member (not shown in the figure) is released. The elastic force drives the locking bar 61b to move upward, and the locking bar 61b is disengaged from the arc-shaped slot 21 and fitted into the locking slot 62a.

In this embodiment, the seat device 200 includes a base 201 with a bearing surface 201 a , a backrest 202 arranged at the rear of the base 201 , and an armrest frame 203 arranged on the backrest 202 . The base 201 is supported on the bottom bracket 101 and is rotatably connected with the bottom bracket 101 around the rotation center line a. When the push rod frame 102 is in the retracted state, the push rod frame 102 is not higher than the bearing surface 201a in the vertical direction. The above arrangement makes the push rod frame 102 in the retracted state not interfere with the rotation of the seat device 200 , and at the same time, it will not interfere with the legs of the child sitting on the seat device 200 .

In this embodiment, the bottom bracket 101 also includes a second locking mechanism (not shown in the figure) that locks the bottom bracket 101 in the unfolded state. A locking mechanism (not shown) remains locked.

The seat device 200 has a forward use state and a rearward use state. In this embodiment, there is also a device between the seat frame 3 and the base 201 for locking the base 201 in the forward use state or the rear use state. To the third locking mechanism (not shown in the figure) under the use state.

The following exemplifies the way of switching between the forward-facing use state and the rear-facing use state of the seat device on the stroller.

When the stroller is in the forward-facing state, as shown in Figures 1 to 3, and the push rod frame 102 is in the open state, the upper push rod 51 and the lower push rod 52 extend obliquely upward from front to back, and both are roughly along the Extending in the same length direction, the handle 53 is set upward, the first locking mechanism is in the locked state, the locking bar 61b is matedly inserted into the locking groove 62a, and the seat device 200 is set forward and is in the forward use state.

When it is necessary to convert the seat device 200 of the stroller to the backward use state, as shown in FIGS. , the upper push rod 51 and the lower push rod 52 are relatively retracted; the forward rotation of the upper push rod 51 drives the cam surface 51a to rotate, and the cam surface 51a pushes the linkage 71 to slide downward along the length extension direction of the lower push rod 52, and the linkage 71 The sliding block 61a is driven to slide downwards, and the locking bar 61b disengages from the locking slot 62a and is slidably located in the arc-shaped slot 21 , at this moment, the first locking mechanism 6 is unlocked. Thereafter, the handle 53 is pushed downward, and the lower push rod 52 rotates clockwise downward around the first axis b until the lower push rod 52 and the upper push rod 51 are sequentially gathered behind the bottom bracket 101 along the front and rear directions. At this time, The grip 53 is arranged facing upward. Synchronously, the locking bar 61 b slides downward along the length extending direction of the arc slot 21 .

Thereafter, the third locking mechanism (not shown in the figure) locks the base 201 and the seat frame 3, and pushes the seat device 200, so that the seat device 200 rotates around the rotation center line a toward the rear, so that the seat device 200 is converted For backward use state.

Subsequently, the handle 53 is pulled upwards, the upper push rod 51 rotates clockwise backward around the second axis c, and the lower push rod 52 rotates upwards counterclockwise around the first axis b, and the upper push rod 51 is opposite to the lower push rod 52 Open, the lower push rod 52 is relatively far away from the rear bracket 2, and the push rod frame 102 is converted from the stowed state to the open state; at the same time, the lock bar 61b slides upward along the length extension direction of the arc groove 21 until the lock bar 61b slides to the arc. At the junction of the shaped groove 21 and the lock groove 62a, the elastic member (not shown in the figure) releases the elastic force to drive the lock bar 61b to move upwards, and the lock bar 61b is disengaged from the arc-shaped groove 21 and inserted into the lock groove 62a At this time, the first locking mechanism 6 is in the locked state again, and the push rod frame 102 is re-deployed relative to the bottom bracket 101 to be in an open state.

Embodiment two

Referring to Fig. 9 to Fig. 11, the difference between this embodiment and the first embodiment mainly lies in that in this embodiment, the upper push rod 51 is relatively slidably inserted in the lower push rod 52, and the linkage 71 is fixed on the upper push rod 51 The lower end of the upper push rod 51 or integrally formed on the lower end of the upper push rod 51 , the link 71 is located above the locking member 6 .

Specifically, when the push rod frame 102 is in an open state, both the upper push rod 51 and the lower push rod 52 extend obliquely upward from front to back, and both extend substantially along the same length direction, and the handle 53 is arranged upward.

During the transition of the push rod frame 102 from the open state to the stowed state, the handle 53 is pushed downward, and the upper push rod 51 slides downward along the length extension direction of the lower push rod 52, and drives the lower end of the upper push rod 51 The linkage piece 71 on the top slides downward until the linkage piece 71 abuts against the slider 61a; continue to push the handle 53 downward, the linkage piece 71 pushes the slider 61a to slide down along the length direction of the lower push rod 52, and the lock bar 61b It is located in the arc-shaped groove 21 so as to disengage from and cooperate with the lock groove 62a, and at this time, the lock of the first locking mechanism 6 is released. The lower push rod 52 rotates clockwise downward around the first axis c until the lower push rod 52 and the upper push rod 51 are gathered behind the bottom bracket 101 along the front and rear direction, and the handle 53 is set facing downward. The pole frame 102 is in a retracted state.

Compared with Embodiment 2, in Embodiment 1, the handle 53 is set upward when the push rod frame 102 is in the open state and the retracted state, so that the user can reach the handle 53 without squatting down when performing operations. , which is conducive to improving the experience of using the stroller.

To sum up, through the demonstration of the above two embodiments, when the orientation of the seat device 200 is changed, the push rod frame 102 on the stroller of the present invention is folded behind the bottom bracket 2 without interfering with the seat device 200 . It will not interfere with the legs of the child sitting on the seat device 200, and the seat device 200 can rotate around the rotation center line a extending in the up and down direction to switch between the forward use state and the backward use state, realizing Children can change directions without getting out of the car, and the operation steps are simple and convenient.

The above-mentioned embodiments are only to illustrate the technical conception and characteristics of the present invention. Substantial equivalent changes or modifications shall fall within the protection scope of the present invention.

Claims (8)

1. A stroller comprising a frame having an expanded configuration, a seating arrangement disposed on the frame, characterized in that: the frame comprises a bottom bracket and a push rod frame with the lower part rotationally connected with the bottom bracket, the seat device can be rotationally arranged on the bottom bracket around a rotation center line extending along the vertical direction, the seat device has a forward using state facing forwards and a backward using state facing backwards, the frame is in a unfolding state, the push rod frame has an unfolding state and a folding state, when the push rod frame is in the unfolding state, the push rod frame extends upwards and backwards from the bottom bracket, and is positioned behind the seat device; when the push rod frame is in a folding state, the push rod frame is folded at the rear part of the bottom bracket, the seat device can rotate around the rotation central line to be switched between the forward use state and the backward use state,

the push rod frame comprises an upper push rod and a lower push rod which can be folded along the length direction, the lower push rod is connected with the bottom support in a rotating mode around a first shaft, the lower portion of the upper push rod is connected with the upper portion of the lower push rod in a rotating mode around a second shaft, a handle for holding is arranged on the upper portion of the upper push rod, when the push rod frame is in the folded state, the lower push rod and the upper push rod are sequentially folded behind the bottom support along the front-back direction, the handle is arranged upwards, a first locking mechanism used for locking the push rod frame in the opened state is arranged between the lower push rod and the bottom support, and a linkage mechanism which enables the first locking mechanism to be converted from the locked state to the unlocked state through linkage in the folding process of the upper push rod relative to the lower push rod is further arranged on the frame.

2. The stroller of claim 1, wherein: the first locking mechanism comprises a locking piece and a matching structure, the locking piece can be arranged at the bottom of the lower push rod in a relatively sliding mode along the length extension direction of the lower push rod, the matching structure is arranged on the bottom support and can be matched with the locking piece, the locking piece is provided with a locking position and an unlocking position on the lower push rod, when the locking piece is located at the locking position, the locking piece is matched with the matching structure, and the first locking mechanism is located in a locking state; when the locking piece is positioned at the unlocking position, the locking piece is separated from the matching structure, the first locking mechanism is in an unlocking state, the linkage mechanism at least comprises a linkage piece, and in the process that the upper push rod is folded relative to the lower push rod, the linkage piece and the locking piece are mutually matched to enable the locking piece to move from the locking position to the unlocking position.

3. The stroller of claim 2, wherein: the locking piece comprises a sliding block and more than one locking rod arranged on the sliding block, the length extension direction of the locking rod is parallel to the axial lead of the first shaft, the matching structure comprises more than one locking groove arranged on the bottom bracket, the bottom bracket is also provided with an arc-shaped groove which is communicated with the locking groove and can provide sliding guide for the locking rod, the arc-shaped groove takes the first shaft as a rotating central line, and when the locking piece is in the locking position, the locking rod is correspondingly inserted in the locking groove in a matching manner; when the locking piece is in the unlocking position, the locking rod is separated from the locking groove and is positioned in the arc-shaped groove in a sliding fit mode.

4. The stroller of claim 2, wherein: the locking position is located the top of unblock position, bottom bracket with still be equipped with between the locking piece provides the locking piece moves required effort towards the locking position.

5. The stroller of claim 2, wherein: the locking position is located above the unlocking position, the lower portion of the upper push rod is connected with the upper portion of the lower push rod in a rotating mode around the second shaft, the linkage piece can be arranged in the lower push rod in a vertically sliding mode, the lower portion of the upper push rod is provided with a cam surface, and the linkage piece abuts between the cam surface and the locking piece in the vertically sliding mode.

6. The stroller of claim 2, wherein: the locking position is located above the unlocking position, the upper push rod is inserted into the lower push rod in a relatively sliding manner, the linkage piece is fixedly arranged at the lower end part of the upper push rod or integrally formed at the lower end part of the upper push rod, and the linkage piece is located above the locking piece.

7. The stroller of claim 1, wherein: the seat device comprises a base with a bearing surface, the base is supported on the bottom support and is rotationally connected with the bottom support around the rotating central line, and when the push rod frame is in the folded state, the push rod frame is not higher than the bearing surface along the up-down direction.

8. Child stroller according to any of claims 1 to 7, characterized in that: the bottom bracket comprises a front bracket, a rear bracket and a second locking mechanism, wherein the bottom of the front bracket is provided with a front wheel assembly, the bottom of the rear bracket is provided with a rear wheel assembly, the seat frame is arranged on the front bracket, the connecting rod assembly is connected between the front bracket and the rear bracket and between the seat frames, the second locking mechanism is used for locking the bottom bracket in a spreading state, the upper portion of the front bracket is rotationally connected with the upper portion of the rear bracket, the rear portion of the seat frame is rotationally connected with the upper portion of the front bracket, the push rod frame is in the process of converting the opening state and the folding state, and the second locking mechanism is kept in a locking state.

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