A stroller frame

Abstract

The present application discloses a baby carriage frame, which comprises a front support, a rear support, a first connecting piece, a second connecting piece, a handle, and a third connecting piece. The upper side of the first connecting piece and the front side of the second connecting piece are respectively pivotally connected to different positions of the front support, and the lower side of the first connecting piece and the rear side of the second connecting piece are respectively pivotally connected to different positions of the rear support. The front support, the rear support, the first connecting piece, and the second connecting piece form a four-bar linkage structure. The lower side of the handle is pivotally connected to the rear support, the front side of the third connecting piece is pivotally connected to the front support and / or the first connecting piece, and the rear side of the third connecting piece is pivotally connected to the handle. The pivotally connected position of the rear side of the third connecting piece to the handle is located above the pivotally connected position of the handle to the rear support. When folding, the handle only needs to be rotated downward and forward, and other components of the frame will be linked until the whole is completely folded. No additional operation is required during the process, so that the folding operation of the baby carriage frame is very simple. Moreover, after folding, the whole frame is in a relatively flat state, so that the volume is small.

Description

Technical Field

[0001] This invention relates to the field of infant and toddler products, and more particularly to a stroller frame. Background Technology

[0002] For greater convenience, strollers are generally designed to switch between an unfolded and a folded state. When needed, the stroller can be unfolded for the child to sit or lie down; when not in use, it can be folded up. This is because a folded stroller requires less space than an unfolded stroller, making it easier to carry and transport, and more suitable for both outdoor use and indoor storage.

[0003] For many parents, one of the performance requirements for a stroller is that it should be easy to fold; another requirement is that it should be as small as possible after folding, because the smaller the size, the more convenient it is to carry when going out (sometimes it needs to be placed in the car, and if the stroller is still relatively large after folding, it will take up too much space), and it should also take up as little space as possible when placed at home.

[0004] A stroller generally consists of a frame and a seat mounted on the frame. For a stroller to be foldable, the frame must also be able to switch between an unfolded and folded state. Since the frame is the foundation of the stroller, parents' performance requirements are reflected in the frame. Furthermore, the frame's structure is a crucial factor in determining how easy or cumbersome the stroller is to fold, and also a significant factor in the size of the folded stroller. Summary of the Invention

[0005] The purpose of this invention is to provide a stroller frame that is easy to fold and has a small size when folded.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A stroller frame is available that can be switched between an unfolded state and a folded state. The stroller frame includes a front support, a rear support, a first connector, a second connector, a handlebar, and a third connector. The upper side of the first connector and the front side of the second connector are pivotally connected to different positions of the front support, respectively. The lower side of the first connector and the rear side of the second connector are pivotally connected to different positions of the rear support, respectively. The front support, rear support, first connector, and second connector form a four-bar linkage structure. The lower side of the handlebar is pivotally connected to the rear support. The front side of the third connector is pivotally connected to the front support and / or the first connector, and the rear side is pivotally connected to the handlebar. The pivot point between the rear side of the third connector and the handlebar is located above the pivot point between the handlebar and the rear support.

[0008] When the frame is in the unfolded state, the pivot position of the lower side of the first connector and the rear support is located behind the pivot position of the rear side of the second connector and the rear support; the pivot position of the upper side of the first connector and the front support is located above the pivot position of the front side of the second connector and the front support.

[0009] When the front side of the third connector is pivotally connected to the front bracket, the pivot position of the third connector to the front bracket is located above the pivot position of the front side of the second connector to the front bracket; or, when the front side of the third connector is pivotally connected to the first connector, the pivot position of the front side of the third connector to the first connector is located above the pivot position of the first connector to the rear bracket.

[0010] The rear support includes two rear legs on the left and right, and the front support includes two front legs on the left and right.

[0011] The rear support also includes a first rear crossbar, and the front support also includes a first front crossbar; the left and right ends of the first rear crossbar are respectively pivotally connected to the left and right rear feet, and the rear side of the first connector is fixedly connected or pivotally connected to the first rear crossbar; or, the left and right ends of the first rear crossbar are respectively fixedly connected to the left and right rear feet, and the rear side of the first connector is pivotally connected to the first rear crossbar; the left and right ends of the first front crossbar are respectively pivotally connected to the left and right front feet, and the front side of the first connector is fixedly connected or pivotally connected to the first front crossbar; or, the left and right ends of the first front crossbar are respectively fixedly connected to the left and right front feet, and the front side of the first connector is pivotally connected to the first front crossbar.

[0012] The rear support also includes a second rear crossbar, and the front support also includes a second front crossbar; the left and right ends of the second rear crossbar are respectively pivotally connected to the left and right rear feet, and the rear side of the second connector is fixedly connected or pivotally connected to the second rear crossbar; or, the left and right ends of the second rear crossbar are respectively fixedly connected to the left and right rear feet, and the rear side of the second connector is pivotally connected to the second rear crossbar; the left and right ends of the second front crossbar are respectively pivotally connected to the left and right front feet, and the front side of the second connector is fixedly connected or pivotally connected to the second front crossbar; or, the left and right ends of the second front crossbar are respectively fixedly connected to the left and right front feet, and the front side of the second connector is pivotally connected to the second front crossbar.

[0013] The second rear crossbar is located above the first rear crossbar, and the second front crossbar is located below the first front crossbar.

[0014] The second rear crossbar bends forward at the position corresponding to the first connector to form an arc-shaped portion that opens backward. When the stroller frame is in the unfolded state, the first connector passes through the opening of the arc-shaped portion.

[0015] The stroller frame is provided with two first connecting parts on the left and right. The upper sides of the two first connecting parts on the left and right are respectively pivotally connected to the left and right front feet, and the lower sides of the two first connecting parts on the left and right are respectively pivotally connected to the left and right rear feet.

[0016] The stroller frame is provided with two second connecting members on the left and right sides. The front sides of the two second connecting members on the left and right sides are respectively pivotally connected to the left and right front feet, and the rear sides of the two second connecting members on the left and right sides are respectively pivotally connected to the left and right rear feet.

[0017] The pivot point between the rider's lower side and the rear support is located in front of the pivot point between the first connector and the rear support.

[0018] The stroller frame is equipped with two handlebars, one on the left and one on the right, with the lower sides of the two handlebars pivotally connected to the two rear feet respectively.

[0019] The stroller frame is provided with two third connecting members on the left and right sides. The rear sides of the two third connecting members are pivotally connected to the two handrails, and the front sides are pivotally connected to the upper side of the front feet.

[0020] The stroller frame also includes a push handle, the lower side of which is movably connected to the handlebar, or the lower side of which is pivotally connected to the upper side of the handlebar.

[0021] The front lower part of the front bracket is connected to the front wheel, and the rear lower part of the rear bracket is connected to the rear wheel.

[0022] The stroller frame of the present invention, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0023] 1. When folding, simply rotate the rider downwards and forwards, and all other components of the frame will automatically fold completely without any additional operation. Thus, the folding operation of the stroller frame of this invention is simple.

[0024] 2. When folded, the frame is relatively flat, resulting in a small overall size that makes it easy to lift and carry, suitable for both outdoor use and indoor storage. Attached Figure Description

[0025] Figure 1 This is a plan view of the stroller frame of the present invention in its unfolded state;

[0026] Figure 2 This is a three-dimensional schematic diagram of the stroller frame of the present invention in its unfolded state;

[0027] Figure 3 This is a plan view of the stroller frame of the present invention in the process of being folded. Figure 1 ;

[0028] Figure 4 This is a three-dimensional schematic diagram of the stroller frame of the present invention in the process of being folded up. Figure 1;

[0029] Figure 5 This is a plan view of the stroller frame of the present invention in the process of further folding;

[0030] Figure 6 This is a three-dimensional schematic diagram of the stroller frame of the present invention in the process of further folding;

[0031] Figure 7 This is a plan view of the stroller frame of the present invention in the folded state;

[0032] Figure 8 This is a three-dimensional schematic diagram of the stroller frame of the present invention in a folded state at one angle;

[0033] Figure 9 This is a three-dimensional schematic diagram of the stroller frame of the present invention in its folded state from another angle. Detailed Implementation

[0034] like Figures 1 to 9 As shown, the present invention discloses a stroller frame that can be switched between an unfolded state and a folded state. The stroller frame includes a front support 1, a rear support 2, a first connector 3, a second connector 4, a handlebar 7, and a third connector 8. The upper side of the first connector 3 and the front side of the second connector 4 are respectively pivotally connected to different positions of the front support 1. The lower side of the first connector 3 and the rear side of the second connector 4 are respectively pivotally connected to different positions of the rear support 2. The front support 1, the rear support 2, the first connector 3, and the second connector 4 form a four-bar linkage structure. The lower side of the handlebar 7 is pivotally connected to the rear support 2. The front side of the third connector 8 is pivotally connected to the front support 1 and / or the first connector 3, and the rear side is pivotally connected to the handlebar 7. The pivot position of the rear side of the third connector 8 and the handlebar 7 is located above the pivot position of the handlebar 7 and the rear support 2.

[0035] In this embodiment, when the frame is in the unfolded state, the pivot position between the lower side of the first connector 3 and the rear support 2 is located behind the pivot position between the rear side of the second connector 4 and the rear support 2. The pivot position between the upper side of the first connector 3 and the front support 1 is located above the pivot position between the front side of the second connector 4 and the front support 1.

[0036] The front support 1 is connected to the front wheel 5 at its lower front, and the rear support 2 is connected to the rear wheel 6 at its lower rear rear.

[0037] The rear support 2 includes two rear legs 21 on the left and right, and the front support 1 includes two front legs 11 on the left and right. The rear support 2 also includes a first rear crossbar 22 whose left and right ends are respectively connected to the left and right rear legs 21; the front support 1 also includes a first front crossbar 12 whose left and right ends are respectively connected to the left and right front legs 11; the left and right ends of the first rear crossbar 22 are respectively pivotally connected to the left and right rear legs 21, and the rear side of the first connecting piece 3 is relatively fixedly connected or pivotally connected to the first rear crossbar 22; or, the left and right ends of the first rear crossbar 22 are respectively fixedly connected to the left and right rear legs 21, and the rear side of the first connecting piece 3 is pivotally connected to the first rear crossbar 22; the left and right ends of the first front crossbar 12 are respectively pivotally connected to the left and right front legs 1, and the front side of the first connecting piece 3 is relatively fixedly connected or pivotally connected to the first front crossbar 12; or, the left and right ends of the first front crossbar 12 are respectively fixedly connected to the left and right front legs 1, and the front side of the first connecting piece 3 is pivotally connected to the first front crossbar 12.

[0038] 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 pivotally connected to the middle of the first front crossbar 12, and the lower side is pivotally connected to the middle of the first rear crossbar 22, thereby making the force on the frame more even. In other embodiments, the stroller frame of the present invention may be provided with two spaced-apart first connecting members 3, and the upper sides of both the left and right first connecting members 3 are pivotally connected to the first front crossbar 12, and the rear sides are both pivotally connected to the first rear crossbar 22.

[0039] The rear support 2 further includes a second rear crossbar 23 connected to the left and right rear feet 21 at its left and right ends respectively; the front support 1 further includes a second front crossbar 13 connected to the left and right front feet 11 at its left and right ends respectively; the left and right ends of the second rear crossbar 23 are pivotally connected to the left and right rear feet 21 respectively, and the rear side of the second connecting piece 4 is fixedly connected or pivotally connected to the second rear crossbar 23, or the left and right ends of the second rear crossbar 23 are fixedly connected to the left and right rear feet 21 respectively, and the rear side of the second connecting piece 4 is pivotally connected to the second rear crossbar 23; the left and right ends of the second front crossbar 13 are pivotally connected to the left and right front feet 1 respectively, and the front side of the second connecting piece 4 is fixedly connected or pivotally connected to the second front crossbar 13; or the left and right ends of the second front crossbar 13 are fixedly connected to the left and right front feet 1 respectively, and the front side of the second connecting piece 4 is pivotally connected to the second front crossbar 13.

[0040] The second rear crossbar 23 is located above the first rear crossbar 22, and the second front crossbar 13 is located below the first front crossbar 12.

[0041] In this embodiment, the stroller frame is provided with two mutually spaced-apart second connecting members 4. When the stroller frame is provided with a first connecting member 3, the two second connecting members 4 are located on the left and right sides of the first connecting member 3, respectively. In other embodiments, the stroller frame of the present invention may only be provided with one second connecting member 4, which is pivotally connected to the middle of the second front crossbar 13 on its front side and connected to the middle of the second rear crossbar 23 on its rear side.

[0042] When the left and right front legs 11 are fixedly connected to the second front crossbar 13, the left and right front legs 11 and the second front crossbar 13 can be formed as a whole or can be three components assembled together. Similarly, when the left and right ends of the second rear crossbar 23 are fixedly connected to the left and right rear legs 21 respectively, the left and right rear legs 21 and the second rear crossbar 23 can be formed as a whole or can be three components assembled together.

[0043] In this embodiment, the left and right ends of the second front crossbar 13 are respectively connected to the lower ends of the left and right front feet 11, and the front wheels 5 are connected to the second front crossbar 13. Two sets or one set of the front wheels 5 can be connected to the second front crossbar 13. The lower rear ends of the two rear feet 21 extend beyond the lower sides of the left and right ends of the first rear crossbar 22, and the lower front ends of both rear feet 21 are connected to the rear wheels 6. In other embodiments, the lower front ends of the left and right front feet 11 may extend beyond the lower sides of the left and right ends of the second front crossbar 13, and the lower front ends of the two front feet 11 may be connected to the front wheels 5; or / and, the left and right ends of the first rear crossbar 22 are respectively connected to the lower ends of the left and right rear feet 21, and the rear wheels 6 are connected to the first rear crossbar 22. Two sets or one set of the rear wheels 6 can be connected to the first rear crossbar 22. When the lower front ends of the left and right front feet 11 extend beyond the lower sides of the left and right ends of the second front crossbar 13, the left and right ends of the second front crossbar 13 can be pivotally connected to the left and right front feet 11 or fixedly connected to the left and right front feet 11. Furthermore, when the left and right ends of the second front crossbar 13 can be pivotally connected to the left and right front feet 11, the front side of the second connecting piece 4 can be pivotally connected to the second front crossbar 13 or fixedly connected to the second front crossbar 13; when the left and right ends of the second front crossbar 13 are fixedly connected to the left and right front feet 11, the front side of the second connecting piece 4 can only be pivotally connected to the second front crossbar 13.

[0044] In another embodiment, regardless of whether the first front crossbar 12 and the first rear crossbar 22 are provided, and regardless of the above-described 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 being pivotally connected to the left and right front legs 11 respectively, and the lower sides of the two left and right first connecting members 3 being pivotally connected to the left and right rear legs 21 respectively. Similarly, regardless of whether the second front crossbar 13 and the second rear crossbar 23 are provided, and regardless of the above-described 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 being pivotally connected to the left and right front legs 11 respectively, and the rear sides of the two left and right second connecting members 4 being pivotally connected to the left and right rear legs 21 respectively.

[0045] The front side of the third connecting member 8 can be pivotally connected only to the front support 1, only to the first connecting member 3, or coaxially pivotally connected to both the front support 1 and the first connecting member 3. When the front side of the third connecting member 8 is pivotally connected to the front support 1, the pivot position of the third connecting member 8 to the front support 1 is located above the pivot position of the front side of the second connecting member 4 to the front support 1. When the front side of the third connecting member 8 is pivotally connected to the first connecting member 3, the pivot position of the front side of the third connecting member 8 to the first connecting member 3 is located above the pivot position of the first connecting member 3 to the rear support 2. When the front side of the third connecting member 8 is pivotally connected to the first connecting member 3 or coaxially pivotally connected to both the front support 1 and the first connecting member 3, the driver 7, the rear support 2, the first connecting member 3, and the third connecting member 8 also form a four-bar linkage structure.

[0046] Preferably, the pivot position between the lower side of the rider 7 and the rear support 2 is located in front of the pivot position between the first connector 3 and the rear support 2.

[0047] In this embodiment, the stroller frame is provided with two left and right handlebars 7, the lower sides of which are pivotally connected to the two rear feet 21 respectively. The stroller frame is provided with two left and right third connecting members 8, the rear sides of which are pivotally connected to the two handlebars 7 respectively, and the front sides of which are pivotally connected to the upper side of the front feet 11 respectively.

[0048] Because the stroller frame of this invention adopts the above design, when the stroller frame of this invention needs to be folded, as... Figures 3 to 6 As shown, when the rider 7 rotates downwards and forwards, the rear side of the second connecting piece 4 and the front side of the rear support 2 will also rotate downwards and forwards. Because the front support 1, rear support 2, first connecting piece 3, and second connecting piece 4 form a four-bar linkage, the lower side of the first connecting piece 3 will also rotate downwards and forwards, and the rear side of the rear support 2 and the rear wheel 6 will rotate upwards and forwards. During this rotational movement of the rider 7, the rear side of the third connecting piece 8 is also linked and rotates downwards and forwards, moving closer to the front support 1. This continues until the components of the stroller frame can no longer rotate relative to each other (e.g., ...). Figures 7 to 9 As shown, the stroller frame is in a folded state. That is, when folding, simply rotate the handrail downwards and forwards, and all other components of the frame will automatically fold completely without any additional operation, making the stroller frame folding operation of this invention simple. Furthermore, in the folded state, the angle between the first connecting member 3 and the front support 1 is relatively small; the second connecting member 4 rotates and moves rearwards below the front support 1, and the angle between the second connecting member 4 and the front support 1 is relatively large; the angle between the rear support 2 and the first connecting member 3 and the second connecting member 4 is small; the third connecting member 8 is relatively close to the front support 1; and the handrail 7 is also relatively close to the third connecting member 8. Therefore, the stroller frame is in a relatively flat state, and the overall volume is relatively small.

[0049] Preferably, the second rear crossbar 23 bends forward at the position corresponding to the first connecting member 3 to form a rearwardly opening arc-shaped portion 231. Thus, when the stroller frame of the present invention is in the unfolded state, the first connecting member 3 passes through the opening of the arc-shaped portion 231, meaning the arc-shaped portion 231 can provide clearance for the first connecting member 3. With this arrangement, the first connecting member 3 can be positioned relatively forward without interfering with the second rear crossbar 23. That is, in the unfolded state, the first connecting member 3 can be located in front of the rear support 2. Therefore, when the frame is folded, the overall frame can be flatter; and during folding, the first connecting member 3 and the second rear crossbar 23 move away vertically from each other (e.g., ...). Figure 4 As shown in the figure, the second rear crossbar 23 and the first connecting piece 3 will not interfere with each other and affect the folding of the entire stroller frame.

[0050] The stroller frame of the present invention also includes a push handle 9. In this embodiment, the lower side of the push handle 9 is movably connected to the handlebar 7. When the frame is unfolded, the overall length of the handlebar 7 and the push handle 9 is more suitable for a child caregiver to push. When folding is required, the push handle 9 can be moved downwards until it can no longer be moved, thereby reducing the overall length of the handlebar 7 plus the push handle 9, that is, reducing the overall height of the stroller frame after folding. Preferably, the lower side of the push handle 9 is movably connected to the interior of the handlebar 7, that is, relative to the handlebar 7, it forms a telescopic push handle 9. After folding, the space required by the handlebar 7 and the push handle 9 together is smaller.

[0051] In other embodiments, the lower side of the push handle 9 may also be pivotally connected to the upper side of the handlebar 7. Thus, when the frame is in the unfolded state, the overall length of the handlebar 7 and the push handle 9 is more suitable for the child caregiver to push. When folding is required, the push handle 9 can be rotated downwards to bring it closer to the handlebar 7, thereby reducing the overall height of the stroller frame after folding.

[0052] In this embodiment, preferably, the lower side of the handlebar 7 and the rear side of the second connecting member 4 are pivotally connected to different positions on the rear support 2, resulting in a thinner and smaller folded frame. Further, the lower end of the handlebar 7 and the rear end of the second connecting member 4 are pivotally connected to different positions on the front end of the rear support 2, so that in the folded state, the lower end of the handlebar 7 is approximately at the same horizontal level as the original front end of the rear support 2 and the original rear end of the second connecting member 4. Even further, the stroller frame of the present invention is also configured such that, in the folded state, the upper end of the push handle 9 is approximately at the same horizontal level as the upper end of the front support 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 extend below the lower end of the handlebar 7. This ensures that the overall height of the folded stroller frame is at a relatively minimum position. Without the push handle 9, the upper end of the handlebar 7 can be at the same horizontal level as the original front end of the rear support 2 and the original rear end of the second connecting member 4. Even with this design, the stroller frame remains small when folded.

[0053] In the above description of relative positions, the position of driver 7 is above, the position of front wheel 5 and rear wheel 6 is below, the position of front wheel 5 is in front, the position of rear wheel 6 is behind, and the positions of the two front feet 11 are to the left and right. It should be noted that the above relative positions will change as the viewing angle changes.

Claims

1. A stroller frame that can be switched between an unfolded state and a folded state, characterized in that: The stroller frame includes a front frame, a rear frame, a first connector, a second connector, a handlebar, and a third connector. The upper side of the first connector and the front side of the second connector are pivotally connected to the front frame, respectively. The lower side of the first connector and the rear side of the second connector are pivotally connected to the rear frame, respectively. When the frame is in the unfolded state, the pivot position of the lower side of the first connector to the rear frame is located behind the pivot position of the rear side of the second connector to the rear frame; the pivot position of the upper side of the first connector to the front frame is located above the pivot position of the front side of the second connector to the front frame. Furthermore, the front frame, rear frame, first connector, second connector, and third connector are all connected together. The connecting member is formed as a four-bar linkage; the lower side of the rider is pivotally connected to the rear support, the front side of the third connecting member is pivotally connected to the front support and / or the first connecting member, and the rear side is pivotally connected to the rider, and the pivot position of the rear side of the third connecting member to the rider is located above the pivot position of the rider and the rear support; when the front side of the third connecting member is pivotally connected to the front support, the pivot position of the third connecting member to the front support is located above the pivot position of the front side of the second connecting member to the front support; or, when the front side of the third connecting member is pivotally connected to the first connecting member, the pivot position of the front side of the third connecting member to the first connecting member is located above the pivot position of the first connecting member to the rear support.

2. The stroller frame according to claim 1, characterized in that: The rear support includes two rear legs on the left and right, and the front support includes two front legs on the left and right.

3. The stroller frame according to claim 2, characterized in that: The rear support also includes a first rear crossbar, and the front support also includes a first front crossbar; the left and right ends of the first rear crossbar are respectively pivotally connected to the left and right rear feet, and the rear side of the first connector is fixedly connected or pivotally connected to the first rear crossbar; or, the left and right ends of the first rear crossbar are respectively fixedly connected to the left and right rear feet, and the rear side of the first connector is pivotally connected to the first rear crossbar; the left and right ends of the first front crossbar are respectively pivotally connected to the left and right front feet, and the front side of the first connector is fixedly connected or pivotally connected to the first front crossbar; or, the left and right ends of the first front crossbar are respectively fixedly connected to the left and right front feet, and the front side of the first connector is pivotally connected to the first front crossbar.

4. The stroller frame according to claim 2, characterized in that: The rear support also includes a second rear crossbar, and the front support also includes a second front crossbar; the left and right ends of the second rear crossbar are respectively pivotally connected to the left and right rear feet, and the rear side of the second connector is fixedly connected or pivotally connected to the second rear crossbar; or, the left and right ends of the second rear crossbar are respectively fixedly connected to the left and right rear feet, and the rear side of the second connector is pivotally connected to the second rear crossbar; the left and right ends of the second front crossbar are respectively pivotally connected to the left and right front feet, and the front side of the second connector is fixedly connected or pivotally connected to the second front crossbar; or, the left and right ends of the second front crossbar are respectively fixedly connected to the left and right front feet, and the front side of the second connector is pivotally connected to the second front crossbar.

5. The stroller frame according to claim 3, characterized in that: The rear support also includes a second rear crossbar, and the front support also includes a second front crossbar; the left and right ends of the second rear crossbar are respectively pivotally connected to the left and right rear feet, and the rear side of the second connector is fixedly connected or pivotally connected to the second rear crossbar; or, the left and right ends of the second rear crossbar are respectively fixedly connected to the left and right rear feet, and the rear side of the second connector is pivotally connected to the second rear crossbar; the left and right ends of the second front crossbar are respectively pivotally connected to the left and right front feet, and the front side of the second connector is fixedly connected or pivotally connected to the second front crossbar; or, the left and right ends of the second front crossbar are respectively fixedly connected to the left and right front feet, and the front side of the second connector is pivotally connected to the second front crossbar.

6. The stroller frame according to claim 5, characterized in that: The second rear crossbar is located above the first rear crossbar, and the second front crossbar is located below the first front crossbar.

7. The stroller frame according to claim 6, characterized in that: The second rear crossbar bends forward at the position corresponding to the first connector to form an arc-shaped portion that opens backward. When the stroller frame is in the unfolded state, the first connector passes through the opening of the arc-shaped portion.

8. The stroller frame according to claim 2, characterized in that: The stroller frame is provided with two first connecting parts on the left and right. The upper sides of the two first connecting parts on the left and right are respectively pivotally connected to the left and right front feet, and the lower sides of the two first connecting parts on the left and right are respectively pivotally connected to the left and right rear feet.

9. The stroller frame according to claim 4, characterized in that: The stroller frame is provided with two first connecting parts on the left and right. The upper sides of the two first connecting parts on the left and right are respectively pivotally connected to the left and right front feet, and the lower sides of the two first connecting parts on the left and right are respectively pivotally connected to the left and right rear feet.

10. The stroller frame according to claim 2, 3, or 8, characterized in that: The stroller frame is provided with two second connecting members on the left and right sides. The front sides of the two second connecting members on the left and right sides are respectively pivotally connected to the left and right front feet, and the rear sides of the two second connecting members on the left and right sides are respectively pivotally connected to the left and right rear feet.

11. The stroller frame according to any one of claims 1 to 9, characterized in that: The pivot point between the rider's lower side and the rear support is located in front of the pivot point between the first connector and the rear support.

12. The stroller frame according to claim 11, characterized in that: The stroller frame is equipped with two handlebars, one on the left and one on the right, with the lower sides of the two handlebars pivotally connected to the two rear feet respectively.

13. The stroller frame according to claim 12, characterized in that: The stroller frame is provided with two third connecting members on the left and right sides. The rear sides of the two third connecting members are pivotally connected to the two handrails, and the front sides are pivotally connected to the upper side of the front feet.

14. The stroller frame according to claim 10, characterized in that: The pivot point between the rider's lower side and the rear support is located in front of the pivot point between the first connector and the rear support.

15. The stroller frame according to claim 14, characterized in that: The stroller frame is equipped with two handlebars, one on the left and one on the right, with the lower sides of the two handlebars pivotally connected to the two rear feet respectively.

16. The stroller frame according to claim 15, characterized in that: The stroller frame is provided with two third connecting members on the left and right sides. The rear sides of the two third connecting members are pivotally connected to the two handrails, and the front sides are pivotally connected to the upper side of the front feet.

17. The stroller frame according to any one of claims 1 to 9, 12 to 16, characterized in that: It also includes a push handle, the lower side of which is movably connected to the rider, or the lower side of which is pivotally connected to the upper side of the rider.

18. The stroller frame according to claim 11, characterized in that: It also includes a push handle, the lower side of which is movably connected to the rider, or the lower side of which is pivotally connected to the upper side of the rider.

19. The stroller frame according to any one of claims 1 to 9, 12 to 16, and 18, characterized in that: The front lower part of the front bracket is connected to the front wheel, and the rear lower part of the rear bracket is connected to the rear wheel.

Images