Trolley frame and trolley with same

Abstract

The invention discloses a stroller frame and a stroller provided with the same, the stroller frame can be switched between an unfolded state and a folded state, the stroller frame comprises a push handle, a front foot, a rear foot, a first connecting piece, a second connecting piece, a supporting piece and a third connecting piece, and the supporting piece is arranged to be connected with a pet basket; the upper sides of the first connecting piece and the second connecting piece are pivoted to different positions of the push handle, and the lower sides are pivoted to different positions of the rear leg; the rear side of the front foot is pivoted with the rear foot or coaxially pivoted with the front side of the rear foot and the lower side of the first connecting piece; the lower side of the third connecting piece is pivoted to the front foot, the upper side of the third connecting piece is pivoted to the supporting piece, and the supporting piece is further pivoted to the second connecting piece. When the frame needs to be folded, the lower side of the push handle is rotated towards the rear lower portion, other assemblies of the frame can be rotated in a linkage mode till the frame is completely folded, and all the assemblies are relatively close to one another. In this way, linkage of other components of the stroller frame is smooth, and the stroller frame is small in overall size after being folded and convenient to carry and store.

Description

Technical Field

[0001] This invention relates to the field of trolley products, and more particularly to a trolley frame and a trolley equipped with the frame. Background Technology

[0002] Strollers are becoming increasingly common in daily life. Some strollers are designed to be paired with child seats, transforming them into children's strollers that parents use to take their children out. Furthermore, with more and more people owning pets, taking pets out in strollers has become a new trend. Pet strollers are simply strollers with a pet basket attached to the frame, allowing the pet to be placed inside while the owner pushes the stroller.

[0003] Whether it's a stroller for children or a stroller for pets, the frame is designed to be foldable to make it more convenient to use. The folded frame is smaller than the unfolded frame, making it easier to carry (e.g., in a car, on a ship, etc.). When not in use, the folded frame takes up less space at home than when unfolded.

[0004] Currently, there are various styles of stroller frame structures on the market, but some stroller frames still have uncoordinated components when folding, making the folding operation complicated and laborious. Moreover, the size of the folded stroller is still not small enough, making it inconvenient to move or carry. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a trolley frame and a trolley equipped with the frame, in which the components move smoothly when folded and the size is small when folded.

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

[0007] A stroller frame is convertible between an unfolded state and a folded state. The frame includes a push handle, a front leg, a rear leg, a first connector, a second connector, a support member, and a third connector. The upper sides of the first and second connectors are pivotally connected to different positions of the push handle, and the lower sides of the first and second connectors are pivotally connected to different positions of the rear leg, thus the push handle, the first connector, the second connector, and the rear leg form a four-bar linkage. The rear side of the front leg is pivotally connected to the rear leg, or to the first connector, or coaxially pivotally connected to the front side of the rear leg and the lower side of the first connector. The lower side of the third connector is pivotally connected to the front leg, and the upper side is pivotally connected to the support member. The support member is also pivotally connected to the second connector.

[0008] The pivot point between the support member and the third connecting member is located behind the pivot point between the support member and the front foot.

[0009] The rear side of the front foot is pivotally connected to the rear foot around the first pivot, or the rear side of the front foot is pivotally connected to the front side of the rear foot and the lower side of the first connector around the first pivot; the lower side of the third connector is pivotally connected to the front foot around the second pivot, and when the frame is in the unfolded state, the first pivot is located behind the second pivot.

[0010] The upper side of the first connector is pivotally connected to the push handle about a third pivot, and the upper side of the second connector is pivotally connected to the push handle about a fourth pivot. When the frame is in the unfolded state, the third pivot is located above the fourth pivot.

[0011] An elastic reset member is provided between any two of the push handle, front foot, rear foot, first connector, second connector, support member, and third connector, and the elastic reset member is in a tensioned state when the frame is in the unfolded state.

[0012] The elastic reset member is a tension spring. The push handle is provided with a first connecting part, and the second connecting member is provided with a second connecting part. When the frame is in the unfolded state, one end of the tension spring is connected to the first connecting part, and the other end goes down around the fourth pivot and then up to connect with the second connecting part; or, the second connecting member has an extension protruding on the side facing the push handle, the fourth pivot passes through the extension and is pivotally connected to the push handle, and the other end of the tension spring goes down around the extension and then up to connect with the second connecting part.

[0013] The second connector has a receiving cavity on the side facing the push handle, and the second connecting part is disposed in the receiving cavity; and a guide space is provided in the receiving cavity, and the other end of the tension spring enters the receiving cavity and connects with the second connecting part.

[0014] The rear foot is connected to the lower rear wheel; the frame is configured such that, in the folded state, the rear wheel and the lower end of the push handle or / and the second connector or / and the first connector are supported on the support surface.

[0015] The lower end face of the push handle and / or the upper end face of the first connector and / or the upper end face of the second connector are provided with texture; preferably, the lower end of the push handle and / or the upper end of the first connector and / or the upper end of the second connector are detachably connected to a support portion, and the texture is provided on the upper end face of the support portion.

[0016] A stroller includes the frame described above; preferably, the support member is configured to be connected to a pet basket, a child seat, or a child sleeping box; preferably, the stroller further includes a pet basket attached to the support member; preferably, the pet basket is also configured to be switchable between an unfolded state and a folded state; preferably, the stroller further includes a child seat attached to the support member; preferably, the stroller further includes a child sleeping box attached to the support member.

[0017] Because the present invention adopts the above-described technical solution, it has the following beneficial effects:

[0018] 1. When folded, all components of the frame rotate smoothly in unison, making the folding operation simple and effortless. Moreover, the overall size of the frame is small after folding, making it easy to carry and store.

[0019] 2. The elastic reset component allows the frame to be retracted by its restoring force, which causes the frame components to rotate automatically and thus retract the entire frame. This makes the retraction and retraction of the frame simpler and less strenuous.

[0020] 3. When folded, the second connecting piece and the rear wheel support each other on the ground, so that the frame is upright when folded, which facilitates the handling of the folded frame.

[0021] 4. Because when the frame is folded up, the support for connecting the pet basket folds up together with the other components of the frame, which is equivalent to the pet basket folding up together with the other components of the frame and being relatively close to them, the overall folding operation of the stroller of the present invention is simpler. Attached Figure Description

[0022] Figure 1 This is a plan view of the trolley frame of the present invention in its unfolded state;

[0023] Figure 2 This is a three-dimensional schematic diagram of the trolley frame of the present invention in its unfolded state;

[0024] Figure 3 This is a plan view of the trolley frame of the present invention during the folding process;

[0025] Figure 4 This is a three-dimensional schematic diagram of the trolley frame of the present invention during the folding process;

[0026] Figure 5 This is a plan view of the trolley frame of the present invention after it is folded up;

[0027] Figure 6 This is a three-dimensional schematic diagram of the trolley frame of the present invention after it is folded up;

[0028] Figure 7 According to Figure 2 An enlarged schematic diagram of part A in the middle;

[0029] Figure 8 According to Figure 2 A magnified diagram of the explosion in section A;

[0030] Figure 9 According to Figure 6 Enlarged schematic diagram of part B in the middle;

[0031] Figure 10 This is another installation embodiment of the trolley elastic reset component of the present invention;

[0032] Figure 11 This is a plan view of the stroller frame and pet basket combined according to the present invention;

[0033] Figure 12 This is a three-dimensional schematic diagram of the stroller frame and pet basket combined according to the present invention. Detailed Implementation

[0034] like Figures 1 to 6 As shown, this invention discloses a stroller frame 100 that can switch between an unfolded state and a folded state. The frame 100 includes a push handle 1, a front leg 2, a rear leg 3, a first connecting member 4, a second connecting member 5, a support member 6, and a third connecting member 7. The upper sides of the first connecting member 4 and the second connecting member 5 are pivotally connected to different positions of the push handle 1, and the lower sides of the first connecting member 4 and the second connecting member 5 are pivotally connected to different positions of the rear leg 3, thereby forming a push handle 1, the first connecting member 4, the second connecting member 5, and the rear leg 3. It forms a four-bar linkage structure; the rear side of the front foot 2 is pivotally connected to the rear foot 3 or to the first connecting member 4, or coaxially pivotally connected to the front side of the rear foot 3 and the lower side of the first connecting member 4; that is, among the front foot 2, the rear side of the front foot 2 can be pivotally connected only to the rear foot 3, or only to the first connecting member 4, or coaxially pivotally connected to the front side of the rear foot 3 and the lower side of the first connecting member 4; the lower side of the third connecting member is pivotally connected to the front foot 2, and the upper side is pivotally connected to the support member 6, and the support member 6 is also pivotally connected to the second connecting member 5.

[0035] The pivot position of the support member 6 and the third connecting member 7 is located behind the pivot position of the support member 6 and the front leg 2.

[0036] The rear side of the front foot 2 is pivotally connected to the rear foot 3 around the first pivot 21, or the rear side of the front foot 2 is pivotally connected to the front side of the rear foot 3 and the lower side of the first connecting member 4 around the first pivot 21; the lower side of the third connecting member 7 is pivotally connected to the front foot 2 around the second pivot 22. When the frame 100 is in the unfolded state, the first pivot 21 is located behind the second pivot 22.

[0037] The upper side of the first connector 4 is pivotally connected to the push handle 1 about the third pivot 11, and the upper side of the second connector 5 is pivotally connected to the push handle 1 about the fourth pivot 12. When the frame 100 is in the unfolded state, the third pivot 11 is located on the upper side of the fourth pivot 12.

[0038] The lower side of the second connector 5 is pivotally connected to the rear foot 3 around the fifth pivot 32, and the lower side of the first connector 4 is pivotally connected to the rear foot 3 around the sixth pivot 31. Alternatively, when the rear side of the front foot 2 is pivotally connected to the front side of the rear foot 3 and the lower side of the first connector 4 around the first pivot 21, the sixth pivot 31 or the first pivot 21 is located in front of the fifth pivot 32 when the frame 100 is in the unfolded state.

[0039] The frame 100 also includes a pivot seat 8. In this embodiment, the pivot seat 8 is fixedly connected to the front side of the rear foot 3. The lower side of the first connecting member 4 and the rear side of the front foot 2 are both pivotally connected to the pivot seat 8. Further, the lower side of the first connecting member 4 and the rear side of the front foot 2 are both pivotally connected to the pivot seat 8 at different positions. Preferably, the pivot position of the lower side of the first connecting member 4 and the pivot seat 8 is located above the pivot position of the front foot 2 and the pivot seat 8; specifically, the lower side of the first connecting member 4 is pivotally connected to the upper side of the pivot seat 8, and the rear side of the front foot 2 is pivotally connected to the lower front side of the pivot seat 8. Because the pivot seat 8 is fixedly connected to the rear foot 3, the rear foot 3 and the pivot seat 8 can be regarded as a whole. The first connecting member 4 is pivotally connected to the pivot seat 8 with the front foot 2, which also achieves the purpose of pivoting with the rear foot 3. In other embodiments, the pivot seat 8 may be fixedly connected to the lower side of the first connecting member 4, with the rear side of the front foot 2 and the front side of the rear foot 3 pivotally connected to the pivot seat 8; alternatively, the pivot seat 8 may be fixedly connected to the rear side of the front foot 2, thus the front foot 2 and the pivot seat 8 are a single unit, which is pivotally connected to the first connecting member 4 and the rear foot 3 as described above. That is to say, of the three components—the lower side of the first connecting member 4, the front side of the rear foot, and the rear side of the front foot—one is fixedly connected to the pivot seat, and the other two are pivotally connected to the pivot seat.

[0040] The front foot 2 is connected to the front lower side of the front wheel 20, and the rear foot 3 is connected to the rear lower side of the rear wheel 30.

[0041] In this embodiment, the stroller frame 100 of the present invention includes connecting left and right side brackets. Each side bracket includes the push handle 1, front leg 2, rear leg 3, first connector 4, second connector 5 and third connector 7. The support member 6 is connected between the two sides, that is, the left and right sides of the support member 6 are respectively pivotally connected to the upper side of the third connector 7 and the second connector 5 on the same side.

[0042] In this embodiment, two front wheels 20 are spaced apart on the left and right sides, and two rear wheels 30 are spaced apart on the left and right sides at the rear, thus forming a four-wheeled cart frame. In other embodiments, the lower sides of the front legs 2 of the two side supports can be connected by a front transverse connector 23, with the two front wheels 20 spaced apart and connected to the front transverse connector 23; or, one front wheel 20 can be connected to the middle of the front transverse connector, thus forming a tricycle with one front wheel 20 in the front and two rear wheels 30 in the rear. In yet another embodiment, the lower sides of the rear legs 3 of the two side supports can be connected by a rear transverse connector, with the two rear wheels 30 spaced apart and connected to the rear transverse connector; or, one rear wheel 30 can be connected to the middle of the rear transverse connector, thus forming a tricycle with two front wheels 20 in the front and one rear wheel 30 in the rear. That is to say, the number and arrangement of the front wheels 20 and rear wheels 30 can be adjusted as needed.

[0043] When the frame 100 is to be folded up, as follows Figure 3 , 4 As shown, the push handle 1 rotates downwards and backwards, causing the first connecting piece 4 and the second connecting piece 5 to rotate downwards and backwards, moving closer to the rear foot 3. The downward rotation of the second connecting piece 5 pulls the rear side of the support piece 6 to rotate downwards and backwards, also moving closer to the rear foot 3. This rotation of the support piece 6 then pulls the upper side of the third connecting piece 7 to rotate downwards and backwards, pulling the front foot 2 to rotate downwards and backwards, moving closer to the rear foot 3. In this way, all components rotate in unison until they can no longer rotate relative to each other, at which point the frame 100 retracts. In the retracted state, the push handle 1, front foot 2, rear foot 3, first connecting piece 4, second connecting piece 5, support piece 6, and third connecting piece 7 are all relatively close together (e.g., ...). Figure 5 , 6 As shown in the figure, the frame 100 has a small volume when folded, making it easy to carry and store.

[0044] Preferably, an elastic reset member 9 is provided between any two of the push handle 1, front foot 2, rear foot 3, first connecting member 4, second connecting member 5, support member 6, and third connecting member 7, and the elastic reset member 9 is in a tensioned state when the frame 100 is in the unfolded state. With this configuration, when the frame 100 is folded up, the restoring force of the elastic reset member 9 will cause the various components of the frame to rotate automatically in linkage, thereby folding up the entire frame 100, making the folding up and folding operation of the frame 100 more convenient and effortless.

[0045] In one embodiment, combined with Figures 7 to 9As shown, the elastic reset member 9 is configured as a tension spring 9, with its two ends connected to the push handle 1 and the second connecting member 5, respectively. Specifically, the push handle 1 is provided with a first connecting part 13, and the second connecting member 5 is provided with a second connecting part 51. When the frame 100 is in the unfolded state, one end of the tension spring 9 is connected to the first connecting part 13, and the other end extends downward around the fourth pivot 12 and then upward to connect with the second connecting part 51; or, the second connecting member 5 has an extension part 52 protruding on the side facing the push handle 1, the fourth pivot 12 passes through the extension part 52 and is pivotally connected to the push handle 1, and the other end of the tension spring 9 extends downward around the extension part 52 and then upward to connect with the second connecting part 51, thereby the tension spring 9 is pulled open and is in a tensioned state. During the closing process, the second connector 5 rotates relative to the push handle 1 around the fourth pivot 12, and the part of the second connector 5 with the second connecting part 51 rotates backward and downward. As a result, the distance between the first connecting part 13 and the second connecting part 51 in the extension direction of the tension spring 9 becomes shorter. Thus, even if no force is applied to any component of the frame 100, the tension spring 9 will cause the push handle 1 and the first connector 4 to rotate automatically relative to each other due to its restoring force, thereby driving other components to close the frame 100.

[0046] Preferably, the second connector 5 has a receiving cavity 54 on the side facing the push handle 1. The second connecting part 51 and the extension part 52 are both disposed within the receiving cavity 54. If the extension part 52 is not provided, part of the fourth rotating shaft 12 will be located within the receiving cavity 54. The other end of the tension spring 9 enters the receiving cavity 54, passes around the fourth rotating shaft 12 or the extension part 52, and connects to the second connecting part 51. With this arrangement, the tension spring 9 is not exposed in the unfolded state, thereby avoiding affecting its function of automatically linking and retracting the components of the frame 100.

[0047] In other embodiments, the tension spring can also be connected between any other rotatable parts of the frame using a similar principle. For example... Figure 10 As shown, one end of the tension spring 9' is connected to the pivot seat 8, and the other end is connected to the third connecting member 7. Specifically, the other end of the tension spring 9' is connected to the lower side of the third connecting member 7. Similarly, when the frame is in the unfolded state, the tension spring 9' is in a tensioned state. Thus, during the folding and closing of the frame, the tension spring 9' can also assist the frame in automatically folding and closing.

[0048] Alternatively, the elastic reset element 9 can also be a torsion spring, with its two ends connected to either pivotally connected to the frame. Similarly, when the frame is unfolded, the torsion spring is in a torsional tension state. The elastic reset element can also be other feasible elastic elements, connected to either pivotally rotatable element of the frame, as long as the aforementioned function can be achieved.

[0049] Preferably, the frame 100 is configured such that, in the folded state, the rear wheel 30 and the lower end of the handlebar 1, and / or the second connecting member 5, and / or the first connecting member 4, are supported on a support surface. The support surface generally refers to the location of the frame when folded. If the frame is folded on the road, the ground is the support surface, and the rear wheel 30 and the lower end of the handlebar 1, and / or the second connecting member 5, and / or the first connecting member 4, are supported on the ground. If the frame 100 is folded and placed at home, the floor of the house is the support surface. If the frame 100 is folded on a table, the table is the support surface. And so on, without further enumeration. That is, when the frame 100 is in the folded state, the rear wheel 30 is supported on the support surface along with any one of the following: the lower end of the push handle 1, the lower end of the first connecting member 4 (in the folded state, the lower end of the first connecting member 4 becomes the upper end of the first connecting member 4 in the unfolded state), and the lower end of the second connecting member 5 (in the folded state, the lower end of the second connecting member 5 becomes the upper end of the second connecting member 5 in the unfolded state). Alternatively, the rear wheel 30 can be supported on the support surface along with two of the three, or the rear wheel 30 can be supported on the support surface along with all three. This arrangement ensures that the frame 100 is in a standing position when folded, rather than lying flat on the ground, thus facilitating movement after folding.

[0050] The lower end face of the push handle 1 and / or the upper end face of the first connecting member 4 and / or the upper end face of the second connecting member 5 are provided with textures. So when the frame 100 is folded up, and the lower end of the push handle 1 and / or the upper end of the first connecting member 4 and / or the upper end of the second connecting member 5 rotates backward and downward to be supported on the support surface together with the rear wheel 30, the textures will increase the friction between the second connecting member 5 and the support surface, so that the frame 100 is less likely to slip after being folded up, making it easier to operate.

[0051] Preferably, a support portion 55 is detachably connected to the lower end of the push handle 1 and / or the upper end of the first connecting member 4 and / or the upper end of the second connecting member 5, and the texture is provided on the upper surface of the support portion 55. Thus, even if the support portion 55 wears out due to contact with the ground after prolonged use, only the new support portion 55 needs to be replaced, without needing to replace the entire lower end of the push handle 1 and / or the upper end of the first connecting member 4 and / or the second connecting member 5.

[0052] In this embodiment, in the folded state, the rear wheel 30 and the second connecting member 5 are supported on the support surface, and the support part 55 is connected to the upper end of the second connecting member 5.

[0053] Furthermore, a connecting seat 50 is fixedly connected to the upper side of the second connecting member 5. The second connecting member 5 is pivotally connected to the push handle 1 through the connecting seat 50, thereby achieving the purpose of pivoting the second connecting member 5 to the push handle 1. The second connecting part 51, the receiving cavity 54, and the extension part 52 are disposed on the connecting seat 50, and the support part 55 is also connected to the connecting seat 50.

[0054] The frame 100 is also provided with a frame 100 locking mechanism to lock it in the unfolded state. The frame 100 locking mechanism can be located between any two of the following pivotally connected components: push handle 1, front leg 2, rear leg 3, first connecting member 4, second connecting member 5, support member 6, and third connecting member 7. After unlocking, the frame 100 can be folded or unfolded. The specific structure and unlocking operation of the frame 100 locking mechanism can be any known and feasible structure, and since it is not the inventive point of this invention, it will not be described in detail here.

[0055] In this embodiment, the front wheel 20 is configured to rotate 360 ​​degrees relative to the front foot 2 around a vertical axis, and a directional mechanism is provided between the front foot 2 and the front wheel 20. When the stroller frame is in the unfolded state, the directional mechanism can be used to lock the front wheel 20 in a state where it cannot rotate 360 ​​degrees relative to the front foot 2 around the vertical axis, or the directional mechanism can be unlocked to allow the front wheel 20 to rotate 360 ​​degrees relative to the front foot 2 around the vertical axis. In the folded state, the directional mechanism can be unlocked, allowing the front wheel 20 to rotate to a suitable angle relative to the front foot 2, thereby bringing the front foot 2 and the front wheel 20 closer to the rear foot 3, resulting in a smaller overall volume of the folded frame 100. The directional mechanism of the front wheel 20 can be any known and feasible structure, and it is not an inventive point of this invention, so it will not be described in detail here.

[0056] The present invention also discloses a stroller, the stroller including the frame described above, wherein the support member 6 is configured to be connected to a pet basket, a child seat, or a child sleeping box.

[0057] like Figure 11 , 12 As shown, the stroller of the present invention also includes a pet basket 200, which is attached to the support member 6.

[0058] The pet basket 200 is also configured to switch between an unfolded state and a folded state. When folding the pet stroller of the present invention, the pet basket 200 can be folded first, bringing it closer to the support member 6, and then the frame 100 can be folded. In this way, the folded pet basket 200 will not interfere with the push handle 1. Moreover, because the support member 6, which is used to connect the pet basket 200, folds together with the other components of the frame 100 when the frame 100 is folded, it is equivalent to the pet basket folding together with the frame 100 and being relatively close to the other components of the frame 100 when the frame 100 is folded, thus making the overall folding operation of the stroller of the present invention simpler.

[0059] The specific structure of the pet basket, the method of its installation, and the specific connection method between the pet basket and the support member 6 can be any known and feasible structure, and are not the inventive point of this invention, so they will not be described in detail here.

[0060] In other embodiments, the stroller of the present invention further includes a child seat connected to the support member; or, the stroller of the present invention further includes a child sleeping box connected to the support member. Furthermore, the pet basket, child seat, child sleeping box, and support member 6 are detachably connected. The connection method between the child seat, child sleeping box, and support member 6 can be any known and feasible structure.

[0061] Those skilled in the art should understand that the terms "upper," "lower," "left," "right," "front," "back," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. When the visual observation changes, the above orientation or positional relationship will also change accordingly, and therefore should not be construed as a limitation of the present invention.

[0062] The embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A stroller frame that can be switched between an unfolded state and a folded state, characterized in that: The frame includes a push handle, a front foot, a rear foot, a first connector, a second connector, a support member, and a third connector. The upper sides of the first and second connectors are pivotally connected to different positions on the push handle, and the lower sides of the first and second connectors are pivotally connected to different positions on the rear foot, thus the push handle, the first connector, the second connector, and the rear foot form a four-bar linkage structure. The rear side of the front foot is pivotally connected to the rear foot, or to the first connector, or coaxially pivotally connected to the front side of the rear foot and the lower side of the first connector. The lower side of the third connector is pivotally connected to the front foot, and the upper side is pivotally connected to the support member. The support member is also pivotally connected to the second connector.

2. The trolley frame according to claim 1, characterized in that: The pivot point between the support member and the third connecting member is located behind the pivot point between the support member and the front foot.

3. The trolley frame according to claim 2, characterized in that: The rear side of the front foot is pivotally connected to the rear foot around the first pivot, or the rear side of the front foot is pivotally connected to the front side of the rear foot and the lower side of the first connector around the first pivot; the lower side of the third connector is pivotally connected to the front foot around the second pivot, and when the frame is in the unfolded state, the first pivot is located behind the second pivot.

4. The trolley frame according to claim 1, 2, or 3, characterized in that: The upper side of the first connector is pivotally connected to the push handle about a third pivot, and the upper side of the second connector is pivotally connected to the push handle about a fourth pivot. When the frame is in the unfolded state, the third pivot is located above the fourth pivot.

5. The stroller frame according to any one of claims 1 to 4, characterized in that: The frame also includes a pivot seat. Of the three components—the lower side of the first connector, the front side of the rear foot, and the rear side of the front foot—one is fixedly connected to the pivot seat, and the other two are pivotally connected to the pivot seat. Preferably, the pivot seat is fixedly connected to the front side of the rear foot, the lower side of the first connector is pivotally connected to the upper side of the pivot seat, and the rear side of the front foot is pivotally connected to the lower front side of the pivot seat.

6. The stroller frame according to any one of claims 1 to 5, characterized in that: An elastic reset member is provided between any two of the push handle, front foot, rear foot, first connecting member, second connecting member, support member, and third connecting member, and the elastic reset member is in a tensioned state when the frame is in the unfolded state; preferably, the elastic reset member is a tension spring, one end of which is connected to the pivot seat and the other end is connected to the third connecting member; preferably, the other end of the tension spring is connected to the lower side of the third connecting member; or, the elastic reset member is a tension spring, the push handle is provided with a first connecting part, and the second connecting member is provided with a second connecting part. When the frame is in the unfolded state, one end of the tension spring is connected to the first connecting part, and the other end extends downward around the fourth pivot and then upward to connect with the second connecting part; or, the second connecting member has an extension protruding on the side facing the push handle, the fourth pivot passes through the extension and is pivotally connected to the push handle, and the other end of the tension spring extends downward around the extension and then upward to connect with the second connecting part.

7. The trolley frame according to claim 6, characterized in that: The second connector has a receiving cavity on the side facing the push handle, and the second connecting part is disposed in the receiving cavity; and a guide space is provided in the receiving cavity, and the other end of the tension spring enters the receiving cavity and connects with the second connecting part.

8. The stroller frame according to any one of claims 1 to 7, characterized in that: The lower end face of the push handle and / or the upper end face of the first connector and / or the upper end face of the second connector are provided with texture; preferably, the lower end of the push handle and / or the upper end of the first connector and / or the upper end of the second connector are detachably connected to a support portion, and the texture is provided on the upper end face of the support portion.

9. The stroller frame according to any one of claims 1 to 8, characterized in that: The rear foot is connected to the lower rear wheel; the frame is configured such that, in the folded state, the rear wheel and the lower end of the push handle or / and the second connector or / and the first connector are supported on the support surface.

10. A trolley, characterized in that: The stroller includes a frame as described in any one of claims 1 to 9; preferably, the support member is configured to be connected to a pet basket, a child seat, or a child sleeping box; preferably, the stroller further includes a pet basket attached to the support member; preferably, the pet basket is also configured to be switchable between an unfolded state and a folded state; preferably, the stroller further includes a child seat attached to the support member; preferably, the stroller further includes a child sleeping box attached to the support member.

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