CN116946237A - Baby carriage frame - Google Patents

Abstract

The invention discloses a baby carriage frame, which comprises a front bracket, a rear bracket, a first connecting piece, a second connecting piece, a rider and a third connecting piece, wherein the upper side of the first connecting piece and the front side of the second connecting piece are respectively pivoted at different positions of the front bracket, the lower side of the first connecting piece and the rear side of the second connecting piece are respectively pivoted at different positions of the rear bracket, and the front bracket, the rear bracket, the first connecting piece and the second connecting piece form a four-bar structure; the lower side of the vehicle hand is pivoted with the rear bracket, the front side of the third connecting piece is pivoted with the front bracket or/and the first connecting piece, the rear side of the third connecting piece is pivoted with the vehicle hand, and the pivoted position of the rear side of the third connecting piece and the vehicle hand is positioned at the upper side of the pivoted position of the vehicle hand and the rear bracket. When the baby carriage frame is required to be folded, the rider only needs to be rotated downwards and forwards, other components of the baby carriage frame can be linked until the whole baby carriage frame is completely folded, and no additional operation is needed in the middle, so that the baby carriage frame is simple and convenient to fold; and after being folded, the whole frame is in a relatively flat state, so that the size is small.

Description

Baby carriage frame

Technical Field

The invention relates to the field of infant products, in particular to a baby carriage frame.

Background

For convenience of use, strollers are generally configured to be convertible between an extended state and a collapsed state, such that when use is desired, the stroller is extended for sitting/lying of a child; when the baby carriage is not needed to be used, the baby carriage is folded, and the occupied space of the folded baby carriage is relatively smaller than that of the baby carriage in an unfolded state, so that the baby carriage is convenient to carry and carry, and is suitable to be carried out or placed indoors.

For many parents, one of the performance requirements for a stroller is that the stroller is easy to fold; another requirement is that the volume after folding is as small as possible, because the smaller the volume is, the more convenient it is to carry out (sometimes it is also needed to put in the car when going out, if the volume after folding is still bigger, the more occupied space is needed), and the occupied space can be reduced as much as possible when put in the home.

Strollers generally include a frame and a seat disposed on the frame. Because the stroller is foldable, the frame must also be capable of being changed between an unfolded state and a folded state, and because the frame is the basis of the stroller, parents also respond to the performance requirements of the stroller on the frame, and the structure of the frame is an important factor for determining whether the stroller is folded simply or in a complicated manner, and also for determining the size of the folded stroller.

Disclosure of Invention

The invention aims to provide a baby carriage frame which is simple and convenient to fold and operate and small in size after being folded.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

the baby carriage frame comprises a front support, a rear support, a first connecting piece, a second connecting piece, a rider and a third connecting piece, wherein the upper side of the first connecting piece and the front side of the second connecting piece are respectively pivoted at different positions of the front support, the lower side of the first connecting piece and the rear side of the second connecting piece are respectively pivoted at different positions of the rear support, and the front support, the rear support, the first connecting piece and the second connecting piece are formed into a four-bar structure; the lower side of the rider is pivoted with the rear bracket, the front side of the third connecting piece is pivoted with the front bracket or/and the first connecting piece, the rear side of the third connecting piece is pivoted with the rider, and the pivoting position of the rear side of the third connecting piece and the rider is positioned at the upper side of the pivoting position of the rider and the rear bracket.

When the frame is in a unfolding state, the pivoting position of the lower side of the first connecting piece and the rear bracket is positioned at the rear side of the pivoting position of the rear side of the second connecting piece and the rear bracket; the pivoting position of the upper side of the first connecting piece and the front bracket is positioned on the upper side of the pivoting position of the front side of the second connecting piece and the front bracket.

When the front side of the third connecting piece is pivoted with the front bracket, the pivoting position of the third connecting piece and the front bracket is positioned at the upper side of the pivoting position of the front side of the second connecting piece and the front bracket; or when the front side of the third connecting piece is pivoted with the first connecting piece, the pivoting position of the front side of the third connecting piece and the first connecting piece is positioned at the upper side of the pivoting position of the first connecting piece and the rear bracket.

The rear support comprises a left rear foot and a right rear foot, and the front support comprises a left front foot and a right front foot.

The rear bracket further comprises a first rear cross bar, and the front bracket further comprises a first front cross bar; the left end and the right end of the first rear cross rod are respectively pivoted with the left rear leg and the right rear leg, the rear side of the first connecting piece is fixedly connected or pivoted with the first rear cross rod relatively, or the left end and the right end of the first rear cross rod are respectively fixedly connected with the left rear leg and the right rear leg relatively, and the rear side of the first connecting piece is pivoted with the first rear cross rod; the left end and the right end of the first front cross rod are respectively pivoted with the left front leg and the right front leg, and the front side of the first connecting piece is fixedly connected or pivoted with the first front cross rod relatively; or, the left end and the right end of the first front cross rod are respectively and fixedly connected with the left and the right front feet, and the front side of the first connecting piece is pivoted with the first front cross rod.

The rear bracket further comprises a second rear cross bar, and the front bracket further comprises a second front cross bar; the left end and the right end of the second rear cross rod are respectively pivoted with the left rear leg and the right rear leg, the rear side of the second connecting piece is fixedly connected or pivoted with the second rear cross rod relatively, or the left end and the right end of the second rear cross rod are respectively fixedly connected with the left rear leg and the right rear leg relatively, and the rear side of the second connecting piece is pivoted with the second rear cross rod; the left end and the right end of the second front cross rod are respectively pivoted with the left front leg and the right front leg, and the front side of the second connecting piece is fixedly connected or pivoted with the second front cross rod relatively; or, the left end and the right end of the second front cross rod are respectively and fixedly connected with the left and the right front feet, and the front side of the second connecting piece is pivoted with the second front cross rod.

The second rear cross bar is located on the upper side of the first rear cross bar, and the second front cross bar is located on the lower side of the first front cross bar.

The second rear cross bar is bent forwards at a position corresponding to the first connecting piece to form an arc-shaped part with a backward opening, and the first connecting piece passes through the opening of the arc-shaped part when the baby carriage frame is in a unfolded state.

The baby carriage frame is provided with a left connecting piece and a right connecting piece, the upper sides of the left connecting piece and the right connecting piece are respectively pivoted on the left front foot and the right front foot, and the lower sides of the left connecting piece and the right connecting piece are respectively pivoted on the left rear foot and the right rear foot.

The baby carriage frame is provided with a left connecting piece and a right connecting piece, the front sides of the left connecting piece and the right connecting piece are respectively pivoted on the left front leg and the right front leg, and the rear sides of the left connecting piece and the right connecting piece are respectively pivoted on the left rear leg and the right rear leg.

The pivoting position of the lower side of the rider and the rear bracket is positioned at the front side of the pivoting position of the first connecting piece and the rear bracket.

The baby carriage frame is provided with a left handle and a right handle, and the lower sides of the left handle and the right handle are respectively pivoted to two rear feet.

The baby carriage frame is provided with a left connecting piece and a right connecting piece, the rear sides of the left connecting piece and the right connecting piece are respectively pivoted on two handles, and the front sides of the left connecting piece and the right connecting piece are respectively pivoted on the upper sides of the front feet.

The baby carriage frame also comprises a push handle, wherein the lower side of the push handle is connected with the handle in a vertically movable mode, or the lower side of the push handle is pivoted with the upper side of the handle.

The front lower part of the front support is connected with a front wheel, and the rear lower part of the rear support is connected with a rear wheel.

The baby carriage frame has the following beneficial effects because the technical scheme is adopted:

1. when the baby carriage is folded, only the rider is required to rotate downwards and forwards, other components of the baby carriage frame can be automatically linked to the baby carriage frame to be completely folded, and no additional operation is required in the middle, so that the baby carriage frame disclosed by the invention is simple and convenient to fold;

2. after folding, the whole frame is relatively flat, so that the whole size is small, the carrying and the carrying are convenient, and the carrying is suitable for being carried out or placed indoors.

Drawings

FIG. 1 is a schematic plan view of a stroller frame according to the present invention in a deployed state;

FIG. 2 is a perspective view of the stroller frame of the present invention in a deployed state;

FIG. 3 is a schematic plan view of a stroller frame according to the present invention during folding;

FIG. 4 is a schematic perspective view of a stroller frame according to the present invention during folding;

FIG. 5 is a schematic plan view of the stroller frame of the present invention during further collapsing;

FIG. 6 is a perspective view of the stroller frame of the present invention during further collapsing;

FIG. 7 is a schematic plan view of the stroller frame of the present invention in a collapsed condition;

FIG. 8 is a perspective view of a stroller frame according to the present invention in a collapsed position;

fig. 9 is a perspective view of the stroller frame according to another aspect of the present invention in a folded state.

Detailed Description

As shown in fig. 1 to 9, the present invention discloses a stroller frame, which can be switched between an unfolded state and a folded state, wherein the stroller frame comprises a front bracket 1, a rear bracket 2, a first connecting piece 3, a second connecting piece 4, a handlebar 7 and a third connecting piece 8, the upper side of the first connecting piece 3 and the front side of the second connecting piece 4 are respectively pivoted at different positions of the front bracket 1, the lower side of the first connecting piece 3 and the rear side of the second connecting piece 4 are respectively pivoted at different positions of the rear bracket 2, and the front bracket 1, the rear bracket 2, the first connecting piece 3 and the second connecting piece 4 are formed into a four-bar structure; the lower side of the handle 7 is pivoted with the rear bracket 2, the front side of the third connecting piece 8 is pivoted with the front bracket 1 or/and the first connecting piece 3, the rear side of the third connecting piece 8 is pivoted with the handle 7, and the pivoting position of the rear side of the third connecting piece 8 and the handle 7 is positioned at the upper side of the pivoting position of the handle 7 and the rear bracket 2.

In this embodiment, when the frame is in the unfolded state, the pivot position between the lower side of the first connecting member 3 and the rear bracket 2 is located at the rear side of the pivot position between the rear side of the second connecting member 4 and the rear bracket 2. The pivoting position of the upper side of the first connecting piece 3 and the front bracket 1 is positioned on the upper side of the pivoting position of the front side of the second connecting piece 4 and the front bracket 1.

The front lower part of the front bracket 1 is connected with a front wheel 5, and the rear lower part of the rear bracket 2 is connected with a rear wheel 6.

The rear bracket 2 comprises a left rear foot 21 and a right rear foot 21, and the front bracket 1 comprises a left front foot 11 and a right front foot 11. The rear bracket 2 further comprises a first rear cross bar 22 with left and right ends respectively connected with the left and right rear legs 21; the front bracket 1 further comprises a first front cross bar 12, the left end and the right end of which are respectively connected with the left front leg 11 and the right front leg 11; the left and right ends of the first rear cross bar 22 are respectively pivoted with the left and right rear legs 21, the rear side of the first connecting piece 3 is fixedly connected or pivoted with the first rear cross bar 22 relatively, or the left and right ends of the first rear cross bar 22 are respectively fixedly connected with the left and right rear legs 21 relatively, and the rear side of the first connecting piece 3 is pivoted with the first rear cross bar 22; the left and right ends of the first front cross rod 12 are respectively pivoted with the left and right front legs 1, and the front side of the first connecting piece 3 is fixedly connected or pivoted with the first front cross rod 12 relatively; or, the left and right ends of the first front cross bar 12 are respectively and fixedly connected with the left and right front feet 1, and the front side of the first connecting piece 3 is pivoted with the first front cross bar 12.

In this embodiment, the stroller frame is provided with a first connecting member 3, and the upper side of the first connecting member 3 is pivoted to the middle of the first front rail 12, and the lower side of the first connecting member is pivoted to the middle of the first rear rail 22, so that the stress of the stroller frame is more uniform. In other embodiments, the stroller frame of the present invention may be provided with left and right first connecting members 3 spaced apart, wherein the upper sides of the left and right first connecting members 3 are pivotally connected to the first front rail 12, and the rear sides are pivotally connected to the first rear rail 22.

The rear bracket 2 further comprises a second rear cross bar 23, the left and right ends of which are respectively connected with the left and right rear legs 21; the front bracket 1 further comprises a second front cross bar 13, the left end and the right end of which are respectively connected with the left front leg 11 and the right front leg 11; the left and right ends of the second rear cross bar 23 are respectively pivoted with the left and right rear legs 21, the rear side of the second connecting piece 4 is fixedly connected or pivoted with the second rear cross bar 23 relatively, or the left and right ends of the second rear cross bar 23 are respectively fixedly connected with the left and right rear legs 21 relatively, and the rear side of the second connecting piece 4 is pivoted with the second rear cross bar 23; the left end and the right end of the second front cross rod 13 are respectively pivoted with the left and the right front feet 1, and the front side of the second connecting piece 4 is fixedly connected or pivoted with the second front cross rod 13 relatively; or, the left and right ends of the second front cross bar 13 are respectively and fixedly connected with the left and right front feet 1, and the front side of the second connecting piece 4 is pivoted with the second front cross bar 13.

The second rear cross bar 23 is located on the upper side of the first rear cross bar 22 and the second front cross bar 13 is located on the lower side of the first front cross bar 12.

In this embodiment, the stroller frame is provided with two left and right second connecting members 4 spaced apart from each other, and when the stroller frame is provided with one first connecting member 3, the two left and right second connecting members 4 are respectively located at left and right sides of the one first connecting member 3. In other embodiments, the stroller frame of the present invention may be provided with only one second connecting member 4, and the front side of the second connecting member 4 is pivotally connected to the middle of the second front rail 13, and the rear side is connected to the middle of the second rear rail 23.

When the left and right front legs 11 are fixedly connected with the second front rail 13, the left and right front legs 11 and the second front rail 13 may be integrally formed or may be three components assembled together. Similarly, when the left and right ends of the second rear cross bar 23 are fixedly connected with the left and right rear legs 21, the left and right rear legs 21 and the second rear cross bar 23 may be integrally formed or may be three components fixedly assembled together.

In this embodiment, the left and right ends of the second front rail 13 are respectively connected to the lower ends of the left and right front legs 11, the front wheels 5 are connected to the second front rail 13, and two or one group of front wheels 5 may be connected to the second front rail 13. The rear lower ends of the two rear legs 21 respectively extend out of the lower sides of the left and right ends of the first rear cross bar 22, and the front lower ends of the two rear legs 21 are connected with the rear wheels 6. In other embodiments, the front lower ends of the left and right front legs 11 extend out of the lower sides of the left and right ends of the second front cross bar 13, and the front lower ends of the two front legs 11 are connected with front wheels 5; or/and, the left and right ends of the first rear cross bar 22 are respectively connected to the lower ends of the left and right rear legs 21, the rear wheels 6 are connected to the first rear cross bar 22, and two or one group of rear wheels 6 may be connected to the first rear cross bar 22. When the front lower ends of the left and right front legs 11 extend out of the lower sides of the left and right ends of the second front cross bar 13, the left and right ends of the second front cross bar 13 may be pivotally connected to the left and right front legs 11 or may be fixedly connected to the left and right front legs 11. And when the left and right ends of the second front cross bar 13 may be pivotally connected to the left and right front legs 11, the front side of the second connecting member 4 may be pivotally connected to the second front cross bar 13, or may be fixedly connected to the second front cross bar 13; when the left and right ends of the second front cross bar 13 are fixedly connected to the left and right front legs 11, the front side of the second connecting member 4 can only be pivotally connected to the second front cross bar 13.

In still another embodiment, regardless of whether the first front rail 12 and the first rear rail 22 are provided or not, and regardless of the arrangement of the second connecting member 4, the stroller frame may be provided with two left and right first connecting members 3, the upper sides of the two left and right first connecting members 3 are respectively pivoted to the two left and right front legs 11, and the lower sides of the two left and right first connecting members 3 are respectively pivoted to the two left and right rear legs 21. Similarly, regardless of whether the second front rail 13 and the second rear rail 23 are provided or not, and regardless of the arrangement of the first connecting member 3, the stroller frame may be provided with two left and right second connecting members 4, the front sides of the two left and right second connecting members 4 are respectively pivoted to the two left and right front legs 11, and the rear sides of the two left and right second connecting members 4 are respectively pivoted to the two left and right rear legs 21.

The front side of the third connecting piece 8 can be pivoted with the front bracket 1 only, can be pivoted with the first connecting piece 3 only, and can also be coaxially pivoted with the front bracket 1 and the first connecting piece 3. When the front side of the third connecting piece 8 is pivoted with the front bracket 1, the pivot position of the third connecting piece 8 and the front bracket 1 is positioned on the upper side of the pivot position of the front side of the second connecting piece 4 and the front bracket 1. When the front side of the third connecting piece 8 is pivoted with the first connecting piece 3, the pivot position of the front side of the third connecting piece 8 and the first connecting piece 3 is positioned at the upper side of the pivot position of the first connecting piece 3 and the rear bracket 2. When the front side of the third connecting piece 8 is pivoted with the first connecting piece 3 or the front side of the third connecting piece 8 is coaxially pivoted with the front bracket 1 and the first connecting piece 3, the rider 7, the rear bracket 2, the first connecting piece 3 and the third connecting piece 8 are also formed into a four-bar structure.

Preferably, the pivotal connection position between the lower side of the handlebar 7 and the rear bracket 2 is located at the front side of the pivotal connection position between the first connecting piece 3 and the rear bracket 2.

In this embodiment, the stroller frame is provided with two left and right handles 7, and the undersides of the two left and right handles 7 are respectively pivoted to two rear legs 21. The stroller frame is provided with a left third connecting piece 8 and a right third connecting piece 8, the rear sides of the left third connecting piece 8 and the right third connecting piece 8 are respectively pivoted on the two handles 7, and the front sides of the left third connecting piece and the right third connecting piece are respectively pivoted on the upper sides of the front feet 11.

Because the stroller frame is designed as above, when the stroller frame is to be folded, as shown in fig. 3 to 6, the handle 7 is rotated downwards and forwards, the rear side of the second connecting piece 4 and the front side of the rear bracket 2 are driven to also rotate downwards and forwards, and because the front bracket 1, the rear bracket 2, the first connecting piece 3 and the second connecting piece 4 are formed into a four-bar structure, the lower side of the first connecting piece 3 also rotates downwards and forwards, and the rear side of the rear bracket 2 and the rear wheel 6 are rotated upwards and forwards; and in the process of the turning movement of the rider 7, the rear side of the third connecting piece 8 is also linked to rotate and move downwards and forwards to lean against the front bracket 1; until the components of the stroller frame are not able to move in relative rotation (as shown in fig. 7-9), the stroller frame is in a collapsed condition. In other words, when the baby carriage is folded, only the rider is required to be rotated downwards and forwards, other components of the baby carriage frame can be automatically linked to the frame to be completely folded, and no additional operation is needed in the middle, so that the baby carriage frame is simple and convenient to fold. And when under the folded condition, the contained angle between first connecting piece 3 and the front bracket 1 is minimum relatively, and the rear side rotary motion of second connecting piece 4 is in the biggest angle with the relative being in of front bracket 1 below, and the contained angle between second connecting piece 4 and front bracket 1, the contained angle between rear bracket 2 and first connecting piece 3, second connecting piece 4 is minimum, third connecting piece 8 is close to with front bracket 1 relatively, and handle 7 is also close to with third connecting piece 8 relatively, thereby baby carriage frame wholly is in a relatively flat state, and whole volume is less.

Preferably, the second rear cross bar 23 is bent forward at a position corresponding to the first connecting member 3 to form an arc portion 231 opened backward, so that the first connecting member 3 passes through the opening of the arc portion 231 in the unfolded state of the stroller frame of the present invention, that is, the arc portion 231 can form an avoidance space for the first connecting member 3. The first connecting piece 3 can be arranged relatively forwards and can not interfere with the second rear cross bar 23, namely, in the unfolded state of the frame, the first connecting piece 3 can be positioned at the front side of the rear bracket 2, so that the whole frame can be flatter after the frame is folded; in the folding process, the first connecting piece 3 and the second rear cross bar 23 are relatively far away from each other up and down (as shown in fig. 4), so that the second rear cross bar 23 and the first connecting piece 3 cannot interfere with each other to influence the folding of the whole stroller frame.

The stroller frame of the present invention further comprises a push handle 9, and in this embodiment, the lower side of the push handle 9 is connected to the handlebar 7 in a vertically movable manner. When the frame is in an unfolding state, the whole length of the handlebar 7 and the push handle 9 is more suitable for a child carer to push, and when the baby stroller frame needs to be folded, the push handle 9 can be moved downwards until the baby stroller frame can not be moved any more, so that the whole length of the handlebar 7 and the push handle 9 can be reduced, namely the whole height of the baby stroller frame after the baby stroller frame is folded is reduced. Preferably, the lower side of the push handle 9 is connected in the handlebar 7 in a manner of up-and-down moving, that is, the push handle 9 is formed to be telescopic relative to the handlebar 7, and after being folded, the handlebar 7 and the push handle 9 together occupy smaller space.

In other embodiments, the lower side of the push handle 9 may be pivotally connected to the upper side of the rider 7. Therefore, when the frame is in an unfolding state, the whole length of the handlebar 7 and the push handle 9 is more suitable for a child carer to push, and when the frame needs to be folded, the push handle 9 can be rotated downwards to be close to the handlebar 7, so that the whole height of the baby carriage frame after being folded can be reduced.

In this embodiment, preferably, the underside of the rider 7 is pivoted to a different position of the rear bracket 2 than the rear side of the second connecting member 4, so that the folded frame is thinner and smaller. Further, the lower end of the rider 7 and the rear end of the second connecting piece 4 are respectively pivoted to different positions of the front end of the rear bracket 2, so that the lower end of the rider 7 is approximately at the same horizontal position as the front end of the original rear bracket 2 and the rear end of the original second connecting piece 4 when the bicycle is in a folded state. Further, the stroller frame of the present invention is further configured such that, in the folded state, the upper end of the push handle 9 is located at a substantially same horizontal position as the upper end of the front bracket 1 and the upper end of the third connecting member 8, and the upper end of the rear wheel 6 is not higher than the upper end of the push handle 9, and the lower end of the front wheel 5 does not go down beyond the lower end of the rider 7. Therefore, the whole height of the folded baby carriage frame is also relatively at a lowest position, and if the push handle 9 is not arranged, the upper end of the handle 7, the front end of the original rear bracket 2 and the rear end of the original second connecting piece 4 can be positioned at the same horizontal position. With this arrangement, the folded stroller frame is still small.

In the above description of the relative orientation, the rider 7 is positioned above, the front wheels 5 and the rear wheels 6 are positioned below, the front wheels 5 are positioned in front, the rear wheels 6 are positioned behind, and the two front feet 11 are positioned on the left and right sides. It will be appreciated that the relative orientation will change as the viewing angle changes.

Claims (12)

1. A stroller frame that is transitionable between an unfolded state and a folded state, characterized in that: the baby carriage frame comprises a front support, a rear support, a first connecting piece, a second connecting piece, a rider and a third connecting piece, wherein the upper side of the first connecting piece and the front side of the second connecting piece are respectively pivoted at different positions of the front support, the lower side of the first connecting piece and the rear side of the second connecting piece are respectively pivoted at different positions of the rear support, and the front support, the rear support, the first connecting piece and the second connecting piece form a four-bar structure; the lower side of the rider is pivoted with the rear bracket, the front side of the third connecting piece is pivoted with the front bracket or/and the first connecting piece, the rear side of the third connecting piece is pivoted with the rider, and the pivoting position of the rear side of the third connecting piece and the rider is positioned at the upper side of the pivoting position of the rider and the rear bracket.

2. The stroller frame according to claim 1, wherein: when the frame is in a unfolding state, the pivoting position of the lower side of the first connecting piece and the rear bracket is positioned at the rear side of the pivoting position of the rear side of the second connecting piece and the rear bracket; the pivoting position of the upper side of the first connecting piece and the front bracket is positioned on the upper side of the pivoting position of the front side of the second connecting piece and the front bracket.

3. The stroller frame according to claim 2, wherein: when the front side of the third connecting piece is pivoted with the front bracket, the pivoting position of the third connecting piece and the front bracket is positioned at the upper side of the pivoting position of the front side of the second connecting piece and the front bracket; or when the front side of the third connecting piece is pivoted with the first connecting piece, the pivoting position of the front side of the third connecting piece and the first connecting piece is positioned at the upper side of the pivoting position of the first connecting piece and the rear bracket.

4. A stroller frame according to claim 1 or 2 or 3, characterized in that: the rear support comprises a left rear foot and a right rear foot, and the front support comprises a left front foot and a right front foot.

5. The stroller frame according to claim 4, wherein: the rear bracket further comprises a first rear cross bar, and the front bracket further comprises a first front cross bar; the left end and the right end of the first rear cross rod are respectively pivoted with the left rear leg and the right rear leg, the rear side of the first connecting piece is fixedly connected or pivoted with the first rear cross rod relatively, or the left end and the right end of the first rear cross rod are respectively fixedly connected with the left rear leg and the right rear leg relatively, and the rear side of the first connecting piece is pivoted with the first rear cross rod; the left end and the right end of the first front cross rod are respectively pivoted with the left front leg and the right front leg, and the front side of the first connecting piece is fixedly connected or pivoted with the first front cross rod relatively; or, the left end and the right end of the first front cross rod are respectively and fixedly connected with the left and the right front feet, and the front side of the first connecting piece is pivoted with the first front cross rod.

6. A stroller frame according to claim 4 or 5, characterized in that: the rear bracket further comprises a second rear cross bar, and the front bracket further comprises a second front cross bar; the left end and the right end of the second rear cross rod are respectively pivoted with the left rear leg and the right rear leg, the rear side of the second connecting piece is fixedly connected or pivoted with the second rear cross rod relatively, or the left end and the right end of the second rear cross rod are respectively fixedly connected with the left rear leg and the right rear leg relatively, and the rear side of the second connecting piece is pivoted with the second rear cross rod; the left end and the right end of the second front cross rod are respectively pivoted with the left front leg and the right front leg, and the front side of the second connecting piece is fixedly connected or pivoted with the second front cross rod relatively; or, the left end and the right end of the second front cross rod are respectively and fixedly connected with the left and the right front feet, and the front side of the second connecting piece is pivoted with the second front cross rod.

7. The stroller frame according to claim 6, wherein: the second rear cross bar is positioned on the upper side of the first rear cross bar, and the second front cross bar is positioned on the lower side of the first front cross bar; preferably, the second rear cross bar is bent forward at a position corresponding to the first connecting piece to form an arc-shaped portion with a backward opening, and the first connecting piece passes through the opening of the arc-shaped portion when the stroller frame is in a unfolded state.

8. A stroller frame according to claim 4 or 6, characterized in that: the baby carriage frame is provided with a left connecting piece and a right connecting piece, the upper sides of the left connecting piece and the right connecting piece are respectively pivoted on the left front foot and the right front foot, and the lower sides of the left connecting piece and the right connecting piece are respectively pivoted on the left rear foot and the right rear foot.

9. A stroller frame according to claim 4 or 5 or 8, wherein: the baby carriage frame is provided with a left connecting piece and a right connecting piece, the front sides of the left connecting piece and the right connecting piece are respectively pivoted on the left front leg and the right front leg, and the rear sides of the left connecting piece and the right connecting piece are respectively pivoted on the left rear leg and the right rear leg.

10. The stroller frame according to any one of claims 1 to 9, wherein: the pivoting position of the lower side of the rider and the rear bracket is positioned at the front side of the pivoting position of the first connecting piece and the rear bracket; preferably, the stroller frame is provided with a left rider and a right rider, and the lower sides of the left rider and the right rider are respectively pivoted to two rear feet; preferably, the stroller frame is provided with a left third connecting piece and a right third connecting piece, the rear sides of the left third connecting piece and the right third connecting piece are respectively pivoted to two handles, and the front sides of the left third connecting piece and the right third connecting piece are respectively pivoted to the upper sides of the front feet.

11. The stroller frame according to any one of claims 1 to 10, wherein: the bicycle further comprises a push handle, wherein the lower side of the push handle is connected with the handlebar in a vertically movable mode, or the lower side of the push handle is pivoted with the upper side of the handlebar.

12. The stroller frame according to any one of claims 1 to 11, wherein: the front lower part of the front support is connected with a front wheel, and the rear lower part of the rear support is connected with a rear wheel.