Patent Description:
In order to make it convenient to carry and store the children stroller in the prior art, the stroller is foldable. There are many types of existing children's strollers, the stroller frame have different numbers of rods, and the connection between the rods are different, so the folding principle and folding method thereof are different, and the folding results are also different. At the same time, the length of the front support or the rear support of the existing stroller after folded is too long, which will result in a larger overall volume of the stroller.

The present invention is aimed to overcome the deficiencies of the conventional art, and provide an improved child stroller with telescopic front or rear support frames to make the folded stroller smaller.

An aspect provides a child stroller comprising a stroller frame having an unfolded state and a first folded state, first wheel assemblies, second wheel assemblies, a lock mechanism for locking the stroller frame in the unfolded state, and a seat rod disposed on the frame, wherein the stroller frame comprises a left support frame on a left side, a right support frame on a right side, and a connection frame connected between the left support frame and the right support frame, and each of the left support frame and the right support frame comprises: a first bottom frame, wherein in the unfolded state of the frame, the first bottom frame extends obliquely from front to rear and upward, the lower end portion of the first bottom frame is connected to the first wheel assemblies, and the first wheel assemblies is a front wheel assemblies; a second bottom frame, wherein in the unfolded state of the frame, the second bottom frame extends obliquely from rear to front and upward, the second bottom frame is a telescopic rod assembly, the second bottom frame comprises an upper rod and a lower rod disposed below the upper rod and slidably connected to the upper rod in the up-down direction, the upper rod is slidably inserted in the lower rod or the lower rod is slidably inserted in the upper rod, a lower end portion of the lower rod is connected to the second wheel assemblies, and the second wheel assemblies is a rear wheel assemblies; a side rod, wherein for an upper end portion of the first bottom frame, an upper end portion of the upper rod and a lower end portion of the side rod, two of the foregoing three portions are rotatably connected, and the third portion is rotatably connected to one of the two portions; a supporting rod rotatably connected to the upper rod via a first shaft; a push rod, a lower portion thereof being respectively connected to an upper end portion of the side rod and an upper end portion of the the supporting rod; a connection rod extending in a front-rear direction when the frame is in the unfolded state, wherein an end portion of the connection rod is rotatably connected to a lower portion of the first bottom frame via a second shaft, the connection rod is further rotatably connected to the supporting rod via a third shaft, and in the unfolded state of the frame, the third shaft is below the first shaft; the child stroller further comprises a driving mechanism for driving the lower rod to slide downward relative to the upper rod when the frame is converted from the first folded state to the unfolded state, and the driving mechanism is an elastic member arranged between the upper rod and the lower rod, the elastic member is used to provide the elastic force required for the lower rod to slide downward relative to the upper rod;
the connection frame comprises: a first transverse rod, wherein an end portion of the first transverse rod is rotatably connected with the first bottom frame of the left support frame via a I-I shaft, and the other end portion of the first transverse rod is rotatably connected with the first bottom frame of the right support frame via a II-I shaft; a second transverse rod, wherein an end portion of the second transverse rod is rotatably connected with the upper rod of the left support frame via a I-II shaft, and the other end portion of the second transverse rod is rotatably connected with the upper rod of the right support frame via a II-II shaft; an upper transverse rod, wherein an end portion of the upper transverse rod is rotatably connected with the push rod of the left support frame via a I-III shaft, and the other end portion of the upper transverse rod is rotatably connected with the push rod of the right support frame via a II-III shaft; a connection-rod transverse rod, wherein an end portion of the connection-rod transverse rod is rotatably connected with the supporting rod of the left support frame via a I-IV shaft, and the other end portion of the connection-rod transverse rod is rotatably connected with the supporting rod of the right support frame via a II-IV shaft; the frame further has a second folded state, when the frame is converted from the first folded state to the second folded state, the left support frame is folded and turned around the I-I shaft, the I-II shaft, and the I-III shaft respectively relative to the connection frame, the right support frame is folded and turned around the II-I shaft, the II-II shaft, and the II-III shaft respectively relative to the connection frame; when the frame is in the second folded state, the axis of the I-I shaft, the axis of the I-II shaft, the axis of the I-III shaft and the axis of the I-IV shaft are parallel or coincident, and the axis of the II-I shaft, the axis of the II-II shaft, the axis of the II-III shaft and the axis of the II-IV shaft are parallel or coincident.

Another aspect provides a child stroller comprising a stroller frame having an unfolded state and a first folded state, first wheel assemblies, second wheel assemblies, a lock mechanism for locking the stroller frame in the unfolded state, and a seat rod disposed on the frame, wherein the stroller frame comprises a left support frame on a left side, a right support frame on a right side, and a connection frame connected between the left support frame and the right support frame, and each of the left support frame and the right support frame comprises: a first bottom frame, wherein in the unfolded state of the frame, the first bottom frame extends obliquely from front to rear and upward, the lower end portion of the first bottom frame is connected to the first wheel assemblies, and the first wheel assemblies is a front wheel assemblies; a second bottom frame, wherein in the unfolded state of the frame, the second bottom frame extends obliquely from rear to front and upward, the second bottom frame is a telescopic rod assembly, the second bottom frame comprises an upper rod and a lower rod disposed below the upper rod and slidably connected to the upper rod in the up-down direction, a lower end portion of the lower rod is connected to the second wheel assemblies, and the second wheel assemblies is a rear wheel assemblies; a side rod, wherein for an upper end portion of the first bottom frame, an upper end portion of the upper rod and a lower end portion of the side rod, two of the foregoing three portions are rotatably connected, and the third portion is rotatably connected to one of the two portions; a supporting rod rotatably connected to the upper rod via a first shaft; a push rod, a lower portion thereof being respectively connected to an upper end portion of the side rod and an upper end portion of the supporting rod; a connection rod extending in a front-rear direction when the frame is in the unfolded state, wherein an end portion of the connection rod is rotatably connected to a lower portion of the first bottom frame via a second shaft, the connection rod is further rotatably connected to the supporting rod via a third shaft, and in the unfolded state of the frame, the third shaft is below the first shaft; the child stroller further comprises a driving mechanism for driving the lower rod to slide upward relative to the upper rod when the frame is converted from the unfolded state to the first folded state and driving the lower rod to slide downward relative to the upper rod when the frame is converted from the first folded state to the unfolded state, the driving mechanism is a driving rod, which extends in the front-rear direction in the unfolded state of the frame, and one end portion of the driving rod is rotatably connected with the lower rod via a sixth shaft, the other end portion of the driving rod is rotatably connected with the connection rod via a fourth shaft, the third shaft is located between the second shaft and the fourth shaft, the upper rod is provided with a guide groove extending in the extension direction of the upper rod, and the sixth shaft is slidably arranged in the guide groove;.

In some embodiments, when the stroller frame is in the unfolded state, the third shaft is below the first shaft.

In some embodiments, when the stroller frame is in the unfolded state, the third shaft is above the first shaft.

In some embodiments, the first wheel assemblies are front wheel assemblies, and the second wheel assemblies are rear wheel assemblies.

In some embodiments, the child stroller further comprises a driving mechanism for driving the lower rod to slide upward relative to the upper rod when the stroller frame is converted from the unfolded state to the first folded state, and/or driving the lower rod to slide downward relative to the upper rod when the stroller frame is converted from the first folded state to the unfolded state.

In some embodiments, the upper rod is slidably inserted in the lower rod or the lower rod is slidably inserted in the upper rod, and the driving mechanism is an elastic member arranged between the upper rod and the lower rod, and the elastic member is used to provide an elastic force required for the lower rod to slide downward relative to the upper rod.

In some embodiments, the driving mechanism is a driving rod extending in the front-rear direction in the unfolded state of the stroller frame, one end portion of the driving rod is rotatably connected with the lower rod via a sixth shaft, an another end portion of the driving rod is rotatably connected with the connection rod via a fourth shaft, and the third shaft is located between the second shaft and the fourth shaft.

In some embodiments, the driving mechanism is a driving rod, one end portion of the driving rod is rotatably connected with the lower rod, an another end portion of the driving rod is rotatably connected with the supporting rod via a fifth shaft, and the fifth shaft is located below the first shaft when the stroller frame is in the unfolded state.

In some embodiments, the driving rod is rotatably connected with the lower rod via a sixth shaft, the upper rod is provided with a guide groove extending in an extension direction of the upper rod, and the sixth shaft is slidably arranged in the guide groove.

In some embodiments, the connection frame comprises: a first transverse rod, with an end portion being rotatably connected with the first bottom frame of the left support frame via a I-I shaft, and an another end portion being rotatably connected with the first bottom frame of the right support frame via a II-I shaft; a second transverse rod, with an end portion being rotatably connected with the second bottom frame of the left support frame via a I-II shaft, and an another end portion being rotatably connected with the second bottom frame of the right support frame via a II-II shaft; an upper transverse rod, with an end portion being rotatably connected with the push rod of the left support frame via a I-III shaft, and an another end portion being rotatably connected with the push rod of the right support frame via a II-III shaft; wherein, the stroller frame further has a second folded state, when the frame is converted from the first folded state to the second folded state, the left support frame is folded and turned around the I-I shaft, the I-II shaft, and the I-III shaft respectively relative to the connection frame, and the right support frame is folded and turned around the II-I shaft, the II-II shaft, and the II-III shaft respectively relative to the connection frame. In some embodiments, the end portion of the second transverse rod is rotatably connected with the upper rod of the left support frame via the I-II shaft, and the another end portion of the second transverse rod is rotatably connected with the upper rod of the right support frame via the II-II shaft.

In some embodiments, when the stroller frame is in the second folded state, axes of the I-I shaft, the I-II shaft, and the I-III shaft are parallel to each other, and axes of the II-I shaft, the II-II shaft, and the II-III shaft are parallel to each other; or, axes of the I-I shaft, the I-II shaft, and the I-III shaft are coincident with each other, and axes of the II-I shaft, the II-II shaft, and the II-III shaft are coincident with each other.

In some embodiments, the connection frame further comprises a connection-rod transverse rod, an end portion of the connection-rod transverse rod is rotatably connected with the supporting rod of the left support frame via a I-IV shaft, an another end portion of the connection-rod transverse rod is rotatably connected with the supporting rod of the right support frame via a II-IV shaft, and when the stroller frame is in the second folded state, axes of the I-I shaft, the I-II shaft, the I-III shaft and the I-IV shaft are parallel or coincident with each other, and axes of the II-I shaft, the II-II shaft, the II-III shaft and the II-IV shaft are parallel or coincident with each other.

Due to the use of the above technical solutions, the present invention has the following advantages over the prior art: it is convenient to fold and unfold the child stroller of the present invention, which is convenient for consumers to use, and the folded construction thereof is more compact by configuring the second bottom frame as a telescopic rod assembly.

1a - first wheel assembly; 1b - second wheel assembly; 2a - right support frame; 2b - left support frame; 3a - first transverse rod; 3b - second transverse rod; 3c - upper transverse rod; 3d - connection-rod transverse rod; <NUM>. first bottom frame; 5a - upper rod; 5aa - upper bar body; 5ab - extension rod; 5b - lower rod; <NUM> - side rod; <NUM> - supporting rod; 8aa - upper push rod body; 8ab - grip rod; 8b - lower push rod; <NUM> - connection rod; <NUM> - driving rod; <NUM> - elastic member; <NUM> - guide groove; <NUM> - seat rod; <NUM> - unlock button; <NUM> - first shaft; <NUM> - second shaft ; <NUM> - third shaft; <NUM> - fourth shaft; <NUM> - fifth shaft; <NUM> - sixth shaft; <NUM> - II-I shaft; <NUM> - II-II shaft; <NUM> - II-III shaft; <NUM> - II-IV shaft; <NUM> - I-I shaft; <NUM> - I-II shaft; <NUM> - I-III shaft; <NUM> - I-IV shaft.

In the following, the technical solution of the present invention is further described combining with the accompanying drawings and specific embodiments.

As shown in <FIG>, the child stroller in this embodiment comprises a stroller frame having an unfolded state and a first folded state, first wheel assemblies 1a, second wheel assemblies 1b, a lock mechanism (not shown) for locking the stroller frame in the unfolded state, and a seat rod <NUM> disposed on the stroller frame, wherein the stroller frame comprises a left support frame 2b on a left side, a right support frame 2a on a right side, and a connection frame connected between the left support frame 2b and the right support frame 2a, and each of the left support frame 2b and the right support frame 2a comprises: a first bottom frame <NUM>, with a lower end portion being connected to one of the first wheel assemblies 1a; a second bottom frame, being a telescopic rod assembly, and comprising an upper rod 5a and a lower rod 5b disposed below the upper rod 5a and slidably connected to the upper rod 5a in an up-down direction, wherein, the upper rod 5a is slidably inserted in the lower rod 5b or the lower rod 5b is slidably inserted in the upper rod 5a, and a lower end portion of the lower rod 5b is connected to one of the second wheel assemblies 1b; in this embodiment, the first bottom frame <NUM> is inclined upward from front to rear when the stroller frame is in the unfolded state, and the second bottom frame is inclined upward from rear to front when the stroller frame is in the unfolded state, and the second wheel assemblies 1b are rear wheel assemblies;.

The child stroller further comprises a driving mechanism for driving the lower rod 5b to slide upward relative to the upper rod 5a when the stroller frame is converted from the unfolded state to the first folded state, and/or driving the lower rod 5b to slide downward relative to the upper rod 5a when the stroller frame is converted from the first folded state to the unfolded state. In this embodiment, the driving mechanism is an elastic member <NUM> arranged between the upper rod 5a and the lower rod 5b, the elastic member <NUM> is used to provide an elastic force required for the lower rod 5b to slide downward relative to the upper rod 5a, and when the stroller frame is in the unfolded state, the length of the second bottom frame is longer than that of the second bottom frame when the stroller frame is in the first folded state, specifically, a locking means (not shown) is disposed between the upper rod 5a and the lower rod 5b for relatively locking the position between the upper rod 5a and the lower rod 5b, that is, the locking means relatively locks the second bottom frame in an extended state in the unfolded state of the stroller frame and in a shortened state in the first folded state of the stroller frame.

As shown in <FIG>, when the stroller frame is in the second folded state, the axis of the I-I shaft <NUM>, the axis of the I-II shaft <NUM>, and the axis of the I-III shaft <NUM> are parallel to each other, and the axis of the II-I shaft <NUM>, the axis of the II-II shaft <NUM>, and the axis of the II-III shaft <NUM> are parallel to each other; preferably, the axis of the I-I shaft <NUM>, the axis of the I-II shaft <NUM>, and the axis of the I-III shaft <NUM> are coincident with each other, and the axis of the II-I shaft <NUM>, the axis of the II-II shaft <NUM>, and the axis of the II-III shaft <NUM> are coincident with each other, so that in the second folded state of the stroller frame, the left support frame 2b and the right support frame 2a could be more close to each other relative to the connection frame.

In order to make the stroller frame more stable in the unfolded state, preferably, the connection frame further comprises a connection-rod transverse rod 3d, wherein an end portion of the connection-rod transverse rod 3d is rotatably connected with the supporting rod <NUM> of the left support frame 2b via a I-IV shaft <NUM>, an another end portion of the connection-rod transverse rod 3d is rotatably connected with the supporting rod <NUM> of the right support frame 2a via a II-IV shaft <NUM>. As shown in <FIG>, when the stroller frame is in the second folded state, the axis of the I-I shaft <NUM>, the axis of the I-II shaft <NUM>, the axis of the I-III shaft <NUM> and the axis of the I-IV shaft <NUM> are parallel or coincident with each other, and the axis of the II-I shaft <NUM>, the axis of the II-II shaft <NUM>, the axis of the II-III shaft <NUM> and the axis of the II-IV shaft <NUM> are parallel or coincident with each other.

On the premise of not increasing the length of the first bottom frame <NUM>, the second bottom frame is provided as a telescopic rod assembly, so that in the unfolded state of the stroller frame, the length of the second bottom frame is elongated, which is conducive to place a basket for placing sundries at the bottom of the stroller frame, and the height of the seat rod <NUM> on the stroller frame from the horizontal plane where the stroller is placed is also correspondingly increased, as shown in <FIG>, an angle α is formed between the first bottom frame <NUM> and the side rod <NUM>, and the angle range of the angle α is <NUM> degrees -<NUM> degrees, the preferred angle of the angle α is <NUM> degrees.

In this embodiment, in the unfolded state of the stroller frame, the distance of the first wheel assemblies 1a in a left-right direction is smaller than the distance of the second wheel assemblies 1b in the left-right direction, and each of the first wheel assemblies 1a and the second wheel assemblies 1b is provided as a single wheel, as shown in <FIG>, when the stroller frame is in the first folded state, the first wheel assemblies 1a are folded inside the second wheel assemblies 1b, and if each of the first wheel assemblies 1a and the second wheel assemblies 1b is provided as double-wheels, it will increase the folded volume of the stroller in the first folded state, and the arrangement of the single wheel makes the folded volume of the stroller in the first folded state smaller, which is also conducive to further folding into the second folded state.

The locking mechanism in this embodiment comprises a locking mechanism for locking the upper push rod and the lower push rod 8b relative to each other, an another locking mechanism for locking the push rod and the supporting rod <NUM> relative to each other, and a yet another locking mechanism for locking the upper rod 5a and the lower rod 5b relative to each other.

When the stroller frame of the child stroller is converted from the unfolded state to the first folded state, the unlock button <NUM> on the grip rod 8ab is pressed to release the relative locking relationship between the upper push rod and the lower push rod 8b, and then the upper push rod slides downward relative to the lower push rod 8b, and the upper push rod hits the unlock button arranged between the push rod and the supporting rod <NUM> to unlock the relative rotational relationship between the push rod and the supporting rod <NUM>, the push rod drives the side rod <NUM> to turn rearward and downward around the rotating connection point with the upper end portion of the upper rod 5a, the push rod drives the supporting rod <NUM> to rotate rearward and downward around the first shaft <NUM>, and moves closer to the second bottom frame, and the supporting rod <NUM> drives the connection rod <NUM>, and under the action of the connection rod <NUM>, the first bottom frame <NUM> is moved closer to the second bottom frame, and then the locking means between the upper rod 5a and the lower rod 5b is unlocked (not shown), and the lower rod 5b is pushed to slide upward relative to the upper rod 5a, then the second bottom frame is locked in the shortened state, as shown in <FIG>, the first folded state is achieved, at which time each of the first wheel assemblies 1a is folded between the second wheel assemblies 1b on the left and right sides, and the axis of the axle of each of the second wheel assemblies 1b extends along the left-right direction, in this embodiment, the grip rods 8ab of the left support frame 2b and the right support frame 2a extend horizontally along the front-rear direction respectively and are folded close on the left and right outermost sides of the entire stroller frame, the frontmost end of the grip rod 8ab does not exceed the frontmost end of the extension rod 5ab, and the lengths of the first transverse rod 3a, the second transverse rod 3b, the upper transverse rod 3c, and the connection-rod transverse rod 3d are equal in the left and right direction, twice the length of the entire stroller frame in the front-rear direction is less than or equal to the length of the first transverse rod 3a, the second transverse rod 3b, the upper transverse rod 3c, or the connection-rod transverse rod 3d; when the stroller frame is converted from the first folded state to the second folded state, the left support frame 2b and the right support frame 2a are turned inward by <NUM> degrees relative to the connection frame, as shown in <FIG>, to reach the second folded state, and at this time, the axis of the axle of each of the second wheel assemblies 1b extends in the front-rear direction, and the rearmost end of each of the first wheel assemblies 1a does not exceed the rearmost ends of four rods, namely the first transverse rod 3a, the second transverse rod 3b, the upper transverse rod 3c, or the connection-rod transverse rod 3d, and the foremost end of each of the second wheel assemblies 1b does not exceed the foremost end of the grip rod 8ab at this time.

Inversely, when the stroller frame is converted from the first folded state to the unfolded state, the locking mechanism for locking the upper rod 5a and the lower rod 5b is unlocked, and the elastic member <NUM> drives the lower rod 5b to slide downward relative to the upper rod 5a, so that the length of the second bottom frame is extended to reach the extended state of the second bottom frame, and then the second bottom frame is locked in the extended state.

As shown in <FIG>, a main difference between this embodiment and Embodiment <NUM> mainly is the driving mechanism, and due to the different driving mechanism in this embodiment, this embodiment no longer comprises a locking mechanism for locking the upper rod 5a and the lower rod 5b relative to each other.

In this embodiment, the driving mechanism comprises a driving rod <NUM>, and the driving rod <NUM> is inclined downward from front to rear in the unfolded state of the stroller frame, a rear end portion of the driving rod <NUM> is rotatably connected to the lower rod 5b, and a front end portion of the driving rod <NUM> is rotatably connected with the supporting rod <NUM> via a fifth shaft <NUM>, and in the unfolded state of the stroller frame, the fifth shaft <NUM> is located below the first shaft <NUM>, specifically the axis of the rotating connection point between the rear end portion of the driving rod <NUM> and the lower rod 5b is coaxial with the axis of each of the second wheel assemblies 1b, the supporting rod <NUM> comprises a body rod and an extension rod extending in the up-down direction in the unfolded state of the stroller frame, an upper end portion of the extension rod is fixedly connected with the body rod, and a lower end portion of the extension rod is rotatably connected to the driving rod <NUM> via the fifth shaft <NUM>, and the fifth shaft <NUM> is located below and rearward of the third shaft <NUM> in the unfolded state of the stroller frame.

When the stroller frame of the child stroller is converted from the unfolded state to the first folded state, the push rod is pressed downward, the push rod drives the side rod <NUM> to turn rearward and downward around the rotating connection point with the upper end portion of the upper rod 5a, the push rod drives the supporting rod <NUM> to rotate rearward and downward around the first shaft <NUM>, and moves closer to the second bottom frame, and the supporting rod <NUM> drives the connection rod <NUM> and the driving rod <NUM>, and under the action of the connection rod <NUM>, the first bottom frame <NUM> is moved closer to the second bottom frame, the driving rod <NUM> drives the lower rod 5b to slide upward relative to the upper rod 5a, then the second bottom frame is shortened to the shortened state, and the first folded state is achieved; when the stroller frame is converted from the first folded state to the second folded state, the left support frame 2b and the right support frame 2a are turned inward by <NUM> degrees relative to the connection frame, to reach the second folded state.

Inversely, when the stroller frame is converted from the first folded state to the unfolded state, the driving rod <NUM> drives the lower rod 5b to slide downward relative to the upper rod 5a, so that the length of the second bottom frame is extended to reach the extended state of the second bottom frame.

As shown in <FIG>, a main difference between this embodiment and Embodiment <NUM> is the driving mechanism.

In this embodiment, the driving mechanism comprises a driving rod <NUM>, and the driving rod <NUM> extends in the front-rear direction in the unfolded state of the stroller frame, a rear end portion of the driving rod <NUM> is rotatably connected to the lower rod 5b, a front end portion of the driving rod <NUM> is rotatably connected to the connection rod <NUM> via a fourth shaft <NUM>, and the third shaft <NUM> is located between the second shaft <NUM> and the fourth shaft <NUM>. Specifically, the driving rod <NUM> is rotatably connected to the upper portion of the lower rod 5b via a sixth shaft <NUM>, the upper rod 5a is provided with a guide groove <NUM> extending in an extension direction of the upper rod 5a, and the sixth shaft <NUM> is slidably arranged in the guide groove <NUM>.

When the stroller frame of the child stroller is converted from the unfolded state to the first folded state, the push rod is pressed downward, the push rod drives the side rod <NUM> to turn rearward and downward around the rotating connection point with the upper end portion of the upper rod 5a, the push rod drives the supporting rod <NUM> to rotate rearward and downward around the first shaft <NUM>, and moves closer to the second bottom frame, and the supporting rod <NUM> drives the connection rod <NUM>, and under the action of the connection rod <NUM>, the first bottom frame <NUM> is moved closer to the second bottom frame, the connection rod <NUM> drives the driving rod <NUM>, the sixth shaft <NUM> slides in the guide groove <NUM> of the upper rod 5a from bottom to top, so that the lower rod 5b slides upward relative to the upper rod 5a, so that the second bottom frame is shortened to the shortened state, and the first folded state is achieved; when the stroller frame is converted from the first folded state to the second folded state, the left support frame 2b and the right support frame 2a are turned inward by <NUM> degrees relative to the connection frame, to reach the second folded state.

Inversely, when the stroller frame is converted from the first folded state to the unfolded state, the driving rod <NUM> drives the sixth shaft <NUM> to slide in the guide groove <NUM> from top to bottom, so that the lower rod 5b slides downward relative to the upper rod 5a, so that the length of the second bottom frame is extended to reach the extended state of the second bottom frame.

As shown in <FIG>, a main difference between this embodiment and Embodiment <NUM> is that: in this embodiment, each first bottom frame is inclined upward from rear to front in the unfolded state of the stroller frame, and each second bottom frame is inclined upward from front to rear in the unfolded state of the stroller frame, each first wheel assembly 1a is a rear wheel assembly, and each second wheel assembly 1b is a front wheel assembly. Specifically, in the unfolded state of the stroller frame, each push rod is inclined upward from front to rear.

Accordingly, a rear end portion of each connection rod <NUM> is rotatably connected to a lower portion of the first bottom frame <NUM> via a second shaft <NUM>, and a front end portion of each connection rod <NUM> is rotatably connected to a lower portion of the supporting rod <NUM> via a third shaft <NUM>.

When the stroller frame of the child stroller is converted from the unfolded state to the first folded state, the push rod is pressed downward, the push rod drives the side rod <NUM> to turn forward and downward around the rotating connection point with the upper end portion of the upper rod 5a, the push rod drives the supporting rod <NUM> to rotate forward and downward around the first shaft <NUM>, and moves closer to the second bottom frame, and the supporting rod <NUM> drives the connection rod <NUM>, under the action of the connection rod <NUM>, the first bottom frame <NUM> is moved closer to the second bottom frame, the locking means between the upper rod 5a and the lower rod 5b is unlocked to push the lower rod 5b, so that the lower rod 5b slides upward relative to the upper rod 5a, the second bottom frame is locked in the shortened state, and the first folded state is achieved.

As shown in <FIG>, a main difference between this embodiment and Embodiment <NUM> is that in the unfolded state of the stroller frame, the third shaft <NUM> at the rotating connection point between the connection rod <NUM> and the supporting rod <NUM> is arranged above the first shaft <NUM> at the rotating connection point between the supporting rod <NUM> and the upper rod 5a, of course, in the unfolded state of the stroller frame, the third shaft <NUM> can also be arranged on the same horizontal plane as the first shaft <NUM>.

Claim 1:
A child stroller comprising a stroller frame having an unfolded state and a first folded state, first wheel assemblies (1a), second wheel assemblies (1b), a lock mechanism for locking the stroller frame in the unfolded state, and a seat rod (<NUM>) disposed on the stroller frame, wherein the stroller frame comprises a left support frame (2b) on a left side, a right support frame (2a) on a right side, and a connection frame connected between the left support frame (2b) and the right support frame (2a), wherein, each of the left support frame (2b) and the right support frame (2a) comprises:
a first bottom frame (<NUM>), with a lower end portion connected to one of the first wheel assemblies (1a);
a second bottom frame, being a telescopic rod assembly, and comprising an upper rod (5a) with a lower end portion connected to one of the second wheel assemblies (1b) and a lower rod (5b) disposed below the upper rod (5a) and slidably connected to the upper rod (5a) in an up-down direction;
a side rod (<NUM>), with a lower end portion, and two of an upper end portion of the first bottom frame (<NUM>), an upper end portion of the upper rod (5a) and the lower end portion of the side rod (<NUM>) are rotatably connected, and the third thereof is rotatably connected to one of the two;
a supporting rod (<NUM>), rotatably connected to the upper rod (5a) via a first shaft (<NUM>);
a push rod , with a lower portion being connected to an upper end portion of the side rod (<NUM>); and
a connection rod (<NUM>), extending in a front-rear direction when the stroller frame is in the unfolded state, and with an end portion rotatably connected to a lower portion of the first bottom frame (<NUM>) via a second shaft (<NUM>);
when the stroller frame is in the unfolded state, one of the first bottom frame (<NUM>) and the second bottom frame is inclined upward from front to rear, and the other one is inclined upward from rear to front;
characterized in that:
the push rod is further connected to an upper end portion of the supporting rod (<NUM>), and
the connection rod (<NUM>) is rotatably connected to the supporting rod (<NUM>) via a third shaft (<NUM>).