CN110481621A - Children trolley - Google Patents

Abstract

The invention discloses a children's stroller. The stroller frame includes a front support, a rear support and a push rod frame that are rotatably connected to each other, and also includes a strut frame, a front connecting frame, a rear connecting frame, a front connecting rod and a rear connecting rod. The rod, wherein the front bracket includes a front upper bracket and a front lower bracket that are relatively sliding and retractable along the length direction, and the rear bracket includes a rear upper bracket and a rear lower bracket that are relatively sliding and retractable along the length direction. During the folding process of the cart frame , the relative rotation of the front connecting frame and the rear connecting frame is folded, and the front upper bracket and the front lower bracket and the rear upper bracket and the rear lower bracket are respectively retracted along the length direction through the front link and the rear link, so that the front bracket is The length of the rear bracket is reduced, so that the overall height of the folded cart frame is greatly reduced, which further reduces the overall size of the folded cart frame, which brings convenience to the user's daily carrying and storage. .

Description

stroller

technical field

The present invention relates to a children's stroller.

Background technique

Strollers play an important role for users to carry infants and young children in their daily life, and have become one of the indispensable children's products in the process of children's growth. In the prior art, the structure of the stroller is various, the connection relationship of each rod is also different, the folding method and folding principle of the frame are also different, and the folded shape and volume are also different. The stroller frame of a conventional children's stroller includes a front bracket, a rear bracket and a push rod bracket. When the stroller frame is folded, the front bracket, the rear bracket and the push rod bracket are folded against each other, so the lengths of the front bracket and the rear bracket are completely complete. However, if the length of the front bracket and the rear bracket is reduced in order to reduce the height of the folded frame, the height of the seat on the frame will be reduced, which will affect the ride comfort.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a new type of stroller for children.

In order to achieve the above purpose, the technical solution adopted in the present invention is: a child stroller, comprising a stroller frame having an unfolded state and a folded state, a front wheel assembly arranged at the bottom front of the stroller frame, A rear wheel assembly at the bottom rear of the cart frame, and a locking mechanism for locking the cart frame in the deployed state, the cart frame comprising:

A front bracket, including a front upper bracket and a front lower bracket that are relatively sliding and telescopic along the length direction;

The rear bracket includes a rear upper bracket and a rear lower bracket that are relatively sliding and retractable along the length direction;

The push rod frame includes a lower push rod frame, an upper push rod frame rotatably connected to the upper part of the lower push rod frame, the upper part of the front upper frame, the upper part of the rear upper frame and the lower push rod Among the three lower parts of the frame, two of them are rotatably connected and the third is rotatably connected to one of the aforementioned two, or the above-mentioned three are rotatably connected together;

The connecting frame assembly includes a front connecting frame and a rear connecting frame respectively arranged in the front-rear direction, the front connecting frame and the rear connecting frame are rotatably connected to each other, and the front part of the front connecting frame is rotatably connected to the front connecting frame On the upper bracket, the rear part of the rear connecting frame is rotatably connected to the rear upper bracket;

a front link, one end of the front link is rotatably connected to the front lower bracket, and the other end of the front link is rotatably connected to the front of the rear connecting frame;

a rear link, one end of the rear link is rotatably connected to the rear lower bracket, and the other end of the rear link is rotatably connected to the rear of the front connecting frame;

A strut frame, the strut frame is rotatably connected with the rear upper bracket, the upper part of the strut frame is rotatably connected with the lower part of the upper push rod frame, and the lower part of the strut frame can be relatively rotatable and The rear connecting frame can be relatively slidably connected to the rear connecting frame along the extending direction of the length of the rear connecting frame.

Preferably, when the cart frame is in a folded state, the push rod frame and the strut frame are turned over and folded at the rear side of the rear bracket, and the front connecting frame and the rear connecting frame rotate relative to each other When folded, the front bracket and the rear bracket are respectively shortened in length and folded together in the front-rear direction.

Preferably, when the cart frame is folded, the front connecting frame and the rear connecting frame rotate relative to each other and are folded in the front-rear direction, wherein the rear part of the front connecting frame and the front connecting frame of the rear connecting frame The parts move upwards.

Preferably, the front connecting frame and the rear connecting frame are rotatably connected through a first shaft, the front connecting rod and the rear connecting frame are rotatably connected through a second shaft, and the rear connecting rod and the front connecting frame are rotatably connected. The connecting frame is rotatably connected through a third shaft, and the first shaft is located between the second shaft and the third shaft along the front-rear direction when the cart frame is in a deployed state.

Preferably, the strut frame is rotatably connected to the rear upper bracket through a fourth axis, the rear part of the rear connecting bracket is rotatably connected to the rear upper bracket through a fifth axis, and the fourth axis An axle is located above the fifth axle on the rear upper bracket.

Preferably, the upper part of the upper push rod frame is rotatably connected to the lower push rod frame through a sixth shaft, and the upper part of the support rod frame is rotatably connected to the lower part of the lower push rod frame through a seventh shaft , the sixth axis and the seventh axis are two axes whose axis lines are parallel to each other.

Preferably, the cart frame further comprises a seat frame arranged in the front-rear direction, the rear part of the seat frame is rotatably connected to the strut frame, and the front part of the seat frame can be opposed to each other along its own length direction It is slidably connected with the lower push rod frame.

Preferably, the upper part of the front upper bracket, the upper part of the rear upper bracket and the lower part of the lower push rod frame are rotatably connected together around the same rotation center line, and the locking mechanism comprises a set on the front upper bracket Between the upper part of the upper part of the rear upper bracket and the lower part of the lower push rod frame, the main locking joint used to lock the three relative to each other is arranged between the upper push rod frame and the lower push rod frame for A push rod locking joint for locking the two relative to each other, the main locking joint and the push rod locking joint are linked and unlocked, and the push rod frame is also provided with an unlocking device for unlocking the push rod locking joint operating part.

Preferably, the front wheel assembly is arranged at the bottom of the front lower bracket, and the rear wheel assembly is arranged at the bottom of the rear lower bracket. When the cart frame is in a folded state, the front wheel assembly is connected to the bottom of the front lower bracket. The rear wheel assemblies are jointly supported on the ground, and the upper end of the upper push rod frame is not higher than the top ends of the front bracket and the rear bracket.

Further, the cart frame includes two sets of side brackets arranged on the left and right sides, and the side brackets on each side include the front bracket, the rear bracket, the push rod frame and the strut frame. The front connecting frame, the rear connecting frame, the front connecting rod and the rear connecting rod are arranged between the two sets of side brackets.

Further, the front connecting frame has two front side rods which are arranged on the left and right sides and both extend in the front and rear directions, and the rear connecting frame has two rear side rods which are arranged on the left and right sides and both extend in the front and rear directions. On the left and right sides of the cart frame, the front side rod is rotatably connected to the rear side rod, and the front part of the front side rod is rotatably connected to the front upper bracket on the same side , the rear part of the rear side rod is rotatably connected to the rear upper bracket on the same side.

Further, the front connecting rod and the rear connecting rod have two groups respectively arranged on the left and right sides, and the front connecting rod is rotatably connected to the front connecting rod on the left and right sides of the cart frame. Between the lower bracket and the front part of the rear side rod, the rear link is rotatably connected between the rear lower bracket and the rear part of the front side rod.

Further, the front connecting frame also has a front connecting rod extending in the left-right direction and located between the rear parts of the two front side rods, and the rear connecting frame also has a front connecting rod extending in the left-right direction and located on the two rear sides. A rear connecting rod between the front parts of the rod, a front cross rod is arranged between the front and lower brackets on both sides, a rear cross rod is arranged between the rear and lower brackets on both sides, and the front link is rotatably arranged Between the front crossbar and the rear connecting rod, the rear connecting rod is rotatably disposed between the rear crossbar and the front connecting rod.

Further, a sliding piece is rotatably connected to the lower part of the strut frame on each side, and the sliding piece is slidably arranged on the rear side rod along the lengthwise extending direction of the rear side rod, and The sliding member is located behind the rotational connection position of the front side rod and the rear side rod on the rear side rod.

Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: the stroller of the present invention has a simple frame structure, simple folding operation, and the front bracket and the rear bracket can be folded along their respective The length direction shrinks synchronously to reduce the length, so that the overall height of the folded cart frame is greatly reduced, which further reduces the overall size of the folded cart frame, which brings convenience to the user's daily carrying and storage. convenient.

Description of drawings

Accompanying drawing 1 is the perspective view of the child stroller of Embodiment 1 in the unfolded state;

Accompanying drawing 2 is the side view under the unfolded state of the stroller of embodiment 1;

Accompanying drawing 3 is the side view of the stroller of embodiment 1 under the half-folded state;

Accompanying drawing 4 is the side view under the folding state of the stroller of embodiment 1;

Accompanying drawing 5 is the perspective view under the unfolded state of the stroller of embodiment 2;

6 is a side view of the child stroller of Embodiment 2 in an unfolded state;

7 is a side view of the stroller of Embodiment 2 in a half-folded state;

8 is a side view of the stroller of Embodiment 2 in a folded state;

Among them: 1. Front bracket; 11. Front upper bracket; 12. Front lower bracket; 100. Front crossbar;

2, rear bracket; 21, rear upper bracket; 22, rear lower bracket; 200, rear cross bar;

3. Push rod frame; 31. Upper push rod frame; 311, Upper push rod; 312, Push handle rod; 32, Lower push rod frame;

4, strut frame; 5, front connecting frame; 51, front connecting rod; 52, front side rod; 6, rear connecting frame; 61, rear connecting rod; 62, rear side rod; 7, front connecting rod; 8, Rear link; 9. Sliding member; 10. Seat frame; 20. Sliding sleeve; 201. Sliding sleeve crossbar; 30. Push rod locking joint; 40. Main locking joint; 50. Unlocking operating member; 60. Front wheel assembly ; 70, rear wheel assembly; a, first axis; b, second axis; c, third axis; d, fourth axis; e, fifth axis; f, sixth axis; g, seventh axis.

Detailed ways

The technical solutions of the present invention will be further elaborated below with reference to the accompanying drawings and specific embodiments.

Example 1

Referring to the child stroller shown in FIGS. 1 to 4 , it includes a stroller frame having an unfolded state and a folded state, a front wheel assembly 60 provided at the bottom front of the stroller frame, and a bottom rear part of the stroller frame. The rear wheel assembly 70, and a locking mechanism for locking the cart frame in the deployed state.

The cart frame includes side brackets arranged on the left and right sides. The side brackets on each side include a front bracket 1, a rear bracket 2, a push rod frame 3, and a strut frame 4. There are also arranged between the side brackets on both sides. Connecting frame assembly, front link 7 and rear link 8.

Wherein, on the left and right sides of the stroller frame, the front bracket 1 gradually extends upwards from front to rear in the unfolded state of the stroller frame, and includes a front upper bracket 11 and a front lower bracket 12 that are relatively sliding and retractable along the length direction, The front wheel assembly 60 is arranged at the bottom of the front and lower brackets 12; the rear bracket 2 is gradually inclined upward and extends from the rear to the front in the unfolded state of the cart frame, and includes a rear upper bracket 21 and a rear lower bracket that are relatively sliding and telescopic along the length direction. 22. The rear wheel assembly 70 is arranged at the bottom of the rear lower bracket 22; the push rod frame 3 includes a lower push rod frame 32 and an upper push rod frame 31 whose lower part is rotatably connected to the upper part of the lower push rod frame 32. The upper push rod frame 31 includes an upper push rod 311 and a push handle rod 312 that are relatively sliding and telescopic, and the push handle rods 312 on both sides are integrally arranged to form a U-shaped rod. On the left and right sides of the cart frame, the upper part of the front upper bracket 11, the upper part of the rear upper bracket 21, and the lower part of the lower push rod bracket 32, among which the two are rotatably connected, and the third one is connected with the above two. One of them is rotationally connected, or the above-mentioned three are rotationally connected together. In this embodiment, it is specifically: the upper part of the front upper bracket 11, the upper part of the rear upper bracket 21 and the lower part of the lower push rod frame 32 are wound around The same rotational center line is rotationally connected together.

The connecting frame assembly includes a front connecting frame 5 and a rear connecting frame 6 respectively arranged in the front and rear directions, the front connecting frame 5 and the rear connecting frame 6 are rotatably connected to each other, and the front part of the front connecting frame 5 is rotatably connected to the front upper bracket 11. , the rear part of the rear connecting frame 6 is rotatably connected to the rear upper bracket 21; ; One end of the rear link 8 is rotatably connected to the rear lower bracket 22, and the other end is rotatably connected to the rear of the front connecting frame 5. The front connecting frame 5 and the rear connecting frame 6 are rotatably connected through the first axis a, the front connecting rod 7 and the rear connecting frame 6 are rotatably connected through the second shaft b, and the rear connecting rod 8 and the front connecting frame 5 are rotatably connected through the third shaft b. The shaft c is rotatably connected, and the first shaft a is located between the second shaft b and the third shaft c along the front-rear direction when the cart frame is in the unfolded state.

On the left and right sides of the cart frame, the strut frame 4 and the rear upper bracket 21 are rotatably connected by a fourth axis d, which is located on the rear upper bracket 21 behind the rear upper bracket 21 and the rear connecting frame 6 . The upper part of the strut frame 4 and the lower part of the upper push rod frame 31 are rotatably connected through the seventh shaft g, the seventh shaft g and the upper push rod frame 31 and the lower push rod The sixth axis f of the rotating connecting shaft between the racks 32 is two axes whose axis lines are parallel to each other. Here, the sixth axis f is located above the seventh axis g on the upper push rod rack 31; The lower part is connected to the rear connecting frame 6 so as to be relatively rotatable and relatively slidable along the lengthwise extending direction of the rear connecting frame 6 .

Specifically, in this embodiment, a front cross bar 100 is arranged between the front and lower brackets 12 on both sides, and a rear cross bar 200 is arranged between the rear lower brackets 22 on both sides; Two front side rods 52 extending in the front-rear direction, and a front connecting rod 51 located between the two front side rods 52 and extending in the left-right direction. The U-shaped rod facing forward; the rear connecting frame 6 has two rear side rods 62 located on the left and right sides and extending in the front-rear direction, and a rear connecting rod 61 located between the two rear side rods 62 and extending in the left-right direction. . On the left and right sides of the cart frame, the front side rod 52 and the rear side rod 62 are rotatably connected around the first axis a, the front part of the front side rod 52 is rotatably connected to the front upper bracket 11 on the same side, and the rear side The rear portion of the rod 62 is rotatably connected to the rear upper bracket 21 on the same side. A sliding member 9 is rotatably connected to the lower part of the strut frame 4 on each side. Here, the sliding member 9 is a sliding sleeve. And the sliding sleeve 9 is located behind the first shaft a on the rear side rod 62 .

The front link 7 is rotatably arranged between the front crossbar 100 and the rear connecting rod 61 , and the rear link 8 is rotatably arranged between the rear crossbar 200 and the front connecting rod 51 . Here, both ends of the front link 7 Each part is provided with an annular sleeve part, so that it is rotatably sleeved on the front cross bar 100 and the rear connecting rod 61 and directly rotates around the axis line of the front cross bar 100 or the axis line of the rear connecting rod 61; Similarly, the two ends of the rear link 8 are also respectively provided with annular sleeves, so that they are respectively rotatably sleeved on the rear crossbar 200 and the front connecting rod 51 and directly around the axis line of the rear crossbar 200 or The axis of the front connecting rod 51 rotates.

Referring to the drawings, the cart frame further includes a seat frame 10 arranged in the front-rear direction. On the left and right sides of the cart frame, the rear part of the seat frame 10 is rotatably connected to the strut frame 4, and the seat The front part of the frame 10 can be relatively slidably connected to the lower push rod frame 32 along its own length. Here, the front part of the seat frame 10 is slidably sleeved with a sliding sleeve 20 which is fixedly connected to the lower push rod frame 32 on.

On the cart frame of this embodiment, the locking mechanism includes a main locking joint 40 arranged between the upper part of the front upper bracket 11 , the upper part of the rear upper bracket 21 and the lower part of the lower push rod bracket 32 for locking the three relative to each other. , and a push rod locking joint 30 arranged between the upper push rod frame 31 and the lower push rod frame 32 for locking the two relative to each other. The above-mentioned main locking joint 40 and the push rod locking joint 30 are linked and unlocked. The lever frame 3 is also provided with an unlocking operation member 50 for unlocking the push rod locking joint 30 . Here, the unlocking operation member 50 is arranged on the top of the push rod frame 3 .

When the cart frame is locked in the unfolded state, as shown in FIG. 1 and FIG. 2 , the front bracket 1 , the rear bracket 2 and the push rod bracket 3 are relatively unfolded, and the front upper bracket 11 and the front lower bracket 12 are relatively elongated. state; the rear upper bracket 21 and the rear lower bracket 22 are in a relatively elongated state, the front connecting frame 5 and the rear connecting frame 6 are supported between the front bracket 1 and the rear bracket 2 in the front-rear direction, and the height of the seat frame 10 is relatively high. High position to meet the requirements of use. The structure of the cart frame is simple, stable, and has good bearing capacity.

When the cart frame needs to be folded up, as shown in FIG. 3 , the unlocking operation member 50 is operated to unlock the push rod locking joint 30 , and the main locking joint 40 is driven to be unlocked in linkage, and the upper push rod frame 31 shortens its length and The lower push rod frame 32 is turned over, and the entire push rod frame 30 is turned backward, so that the support rod frame 4 is also turned backward relative to the rear upper bracket 21 around the fourth axis d, so that the lower part of the support rod frame 4 is forward and Move upward, so that the front connecting frame 5 and the rear connecting frame 6 rotate around the first axis a and gradually close in the front-rear direction, wherein the rear part of the front connecting frame 5 and the front part of the rear connecting frame 6 move upward respectively, driving the front connecting frame The rod 7 and the rear link 8 move upward; then, under the action of the front link 7 and the rear link 8, the front upper bracket 11 and the front lower bracket 12, the rear upper bracket 21 and the rear lower bracket 22 are respectively contracted along the length direction , so that the length of the front bracket 1 and the rear bracket 2 are shortened synchronously, and the front bracket 1 and the rear bracket 2 are gradually approached in the front-rear direction.

The cart frame is finally folded as shown in Figure 4, the front bracket 1, the rear bracket 2, the strut frame 4, the lower push rod frame 32 and the upper push rod frame 31 move closer to each other in the front-rear direction, and the front connecting frame 5 and the rear connecting frame are connected to each other. The frame 6 , the front link 7 and the rear link 8 are folded between the front bracket 1 and the rear bracket 2 , and the seat frame 10 is also folded between the strut frame 4 and the lower push rod frame 32 . The rods are close together, so that the structure of the frame of the cart in the folded state is very compact. In this folded state, the front wheel assembly 60 and the rear wheel assembly 70 are jointly supported on the ground, the upper end of the upper push rod frame 31 is not higher than the top ends of the front bracket 1 and the rear bracket 2, and the overall height dimension after folding is very small. Easy to carry and store.

Example 2

Referring to the child stroller shown in FIGS. 5 to 8 , the main difference between the stroller frame and the first embodiment is that in this embodiment, the front connecting frame 5 has two left and right sides respectively extending in the front and rear directions. The front side rods 52 and the rear connecting frame 6 have two groups of rear side rods 62 which are respectively arranged on the left and right sides and both extend in the front and rear directions. On the left and right sides of the cart frame, the front side rod 52 is rotatably connected to the middle of the rear side rod 62 , the front part of the front side rod 52 is rotatably connected to the front upper bracket 11 on the same side, and the rear side of the rear side rod 62 is rotatably connected to the front upper bracket 11 on the same side. The part is rotatably connected to the rear upper bracket 21 on the same side. The sliding member 9 at the lower part of the strut frame 4 is slidably arranged on the rear side rod 62 . The front link 7 is rotatably connected between the front lower bracket 12 and the front part of the rear side rod 62 , and the rear link 8 is rotatably connected between the rear lower bracket 22 and the rear part of the front side rod 52 . In this embodiment, a sliding sleeve cross bar 201 is also fixedly disposed between the sliding sleeves 20 on both sides to provide lateral auxiliary support for the seat frame 10 .

The folding principle of the cart frame is similar to the folding principle of the cart frame in Embodiment 1, and will not be repeated here. The folded cart frame is shown in FIG. 8 , and its size is also very small.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the art to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims (14)

1. A children's stroller, comprising a stroller frame having an unfolded state and a folded state, a front wheel assembly arranged at the bottom front of the stroller frame, and a rear wheel set at the bottom rear of the stroller frame. A wheel assembly, and a locking mechanism for locking the cart frame in a deployed state, wherein the cart frame includes: A front bracket, including a front upper bracket and a front lower bracket that are relatively sliding and telescopic along the length direction; The rear bracket includes a rear upper bracket and a rear lower bracket that are relatively sliding and retractable along the length direction; The push rod frame includes a lower push rod frame, an upper push rod frame rotatably connected to the upper part of the lower push rod frame, the upper part of the front upper frame, the upper part of the rear upper frame and the lower push rod Among the three lower parts of the frame, two of them are rotatably connected and the third is rotatably connected to one of the aforementioned two, or the above-mentioned three are rotatably connected together; The connecting frame assembly includes a front connecting frame and a rear connecting frame respectively arranged in the front-rear direction, the front connecting frame and the rear connecting frame are rotatably connected to each other, and the front part of the front connecting frame is rotatably connected to the front connecting frame On the upper bracket, the rear part of the rear connecting frame is rotatably connected to the rear upper bracket; a front link, one end of the front link is rotatably connected to the front lower bracket, and the other end of the front link is rotatably connected to the front of the rear connecting frame; a rear link, one end of the rear link is rotatably connected to the rear lower bracket, and the other end of the rear link is rotatably connected to the rear of the front connecting frame; A strut frame, the strut frame is rotatably connected with the rear upper bracket, the upper part of the strut frame is rotatably connected with the lower part of the upper push rod frame, and the lower part of the strut frame can be relatively rotatable and The rear connecting frame can be relatively slidably connected to the rear connecting frame along the extending direction of the length of the rear connecting frame. 2 . The stroller according to claim 1 , wherein when the stroller frame is in a folded state, the push rod frame and the strut frame are turned over and folded on the rear side of the rear bracket. 3 . The front connecting frame and the rear connecting frame are rotated and folded relative to each other, and the front support and the rear support are respectively shortened in length and mutually folded in the front-rear direction. 3 . The stroller according to claim 1 , wherein when the stroller frame is folded, the front connecting frame and the rear connecting frame rotate relative to each other and are folded in the front-rear direction, wherein the The rear part of the front connecting frame and the front part of the rear connecting frame move upward respectively. 4 . The stroller according to claim 1 , wherein the front connecting frame and the rear connecting frame are rotatably connected through a first shaft, and the front link and the rear connecting frame are connected by a second shaft. 5 . The shaft is rotatably connected, and the rear link and the front connecting frame are rotatably connected through a third shaft. When the cart frame is in an unfolded state, the first shaft is located between the second shaft and the second shaft in the front-rear direction. between the third axis. 5 . The stroller according to claim 1 , wherein the strut frame is rotatably connected to the rear upper bracket through a fourth axis, and the rear part of the rear connecting frame is rotated through a fifth axis. 6 . connected to the rear upper bracket, the fourth shaft is located above the fifth shaft on the rear upper bracket. 6 . The stroller according to claim 1 , wherein the upper part of the upper push rod frame is rotatably connected to the lower push rod frame through a sixth axis, and the upper part of the support rod frame is rotatably connected to the lower push rod frame through a sixth axis. 7 . Seven shafts are rotatably connected with the lower part of the lower push rod frame, and the sixth shaft and the seventh shaft are two shafts whose axis lines are parallel to each other. 7 . The stroller according to claim 1 , wherein the stroller frame further comprises a seat frame arranged in the front-rear direction, and the rear part of the seat frame is rotatably connected to the strut frame. 8 . , the front part of the seat frame can be relatively slidably connected with the lower push rod frame along its own length direction. 8 . The stroller according to claim 1 , wherein the upper part of the front upper bracket, the upper part of the rear upper bracket and the lower part of the lower push rod frame are rotatably connected to each other around the same rotation center line. 9 . At the same time, the locking mechanism includes a main locking joint arranged between the upper part of the front upper bracket, the upper part of the rear upper bracket and the lower part of the lower push rod bracket for locking the three relative A push rod locking joint between the upper push rod frame and the lower push rod frame is used to lock the two relative to each other. The main locking joint and the push rod locking joint are linked and unlocked. An unlocking operation member for unlocking the push rod locking joint is also provided. 9 . The stroller according to claim 1 , wherein the front wheel assembly is arranged at the bottom of the front lower bracket, the rear wheel assembly is arranged at the bottom of the rear lower bracket, and the pusher When the vehicle frame is in a folded state, the front wheel assembly and the rear wheel assembly are jointly supported on the ground, and the upper end of the upper push rod frame is not higher than the top ends of the front bracket and the rear bracket. 10. The stroller according to any one of claims 1 to 9, wherein the stroller frame includes two sets of side brackets arranged on the left and right sides, and the side brackets on each side include all the side brackets. The front bracket, the rear bracket, the push rod bracket and the strut bracket, the front connecting bracket, the rear connecting bracket, the front connecting rod and the rear connecting rod are arranged between the two sets of side brackets. 11 . The stroller according to claim 10 , wherein the front connecting frame has two front side rods that are arranged on the left and right sides and both extend in the front-rear direction, and the rear connecting frame has two side bars that are respectively arranged on the left and right sides. Two rear side rods on both sides and extending in the front and rear directions, on the left and right sides of the cart frame, the front side rods are rotatably connected with the rear side rods, and the front side of the front side rods It is rotatably connected to the front upper bracket on the same side, and the rear part of the rear side rod is rotatably connected to the rear upper bracket on the same side. 12 . The stroller according to claim 11 , wherein the front connecting rod and the rear connecting rod have two groups respectively arranged on the left and right sides, and the left and right sides of the stroller frame are on the left and right sides. 13 . , the front link is rotatably connected between the front lower bracket and the front part of the rear side rod, and the rear link is rotatably connected between the rear lower bracket and the rear part of the front side rod between. 13. The stroller according to claim 11, wherein the front connecting frame further has a front connecting rod extending in the left-right direction and located between the rear parts of the two front side rods, the rear connecting frame There is also a rear connecting rod extending in the left and right direction and located between the front parts of the two rear side rods, a front cross rod is arranged between the front and lower brackets on both sides, and a front lower bracket is arranged between the rear lower brackets on both sides. a rear crossbar, the front link is rotatably arranged between the front crossbar and the rear connecting rod, and the rear link is rotatably arranged between the rear crossbar and the front connecting rod . 14. The stroller of claim 11, wherein the lower part of the strut frame on each side is rotatably connected to a sliding member, the sliding member can extend along the length of the rear side rod The direction sliding is provided on the rear side rod, and the sliding member is located behind the rotational connection position of the front side rod and the rear side rod on the rear side rod.