Flat folding cart frame and cart

Abstract

The utility model relates to the technical field of carts, in particular to a flat folding cart frame and a cart, the flat folding cart frame comprises two vertical frames which are oppositely arranged, the bottoms of the vertical frames are provided with idler wheels, a folding bottom frame is arranged between the two vertical frames, the bottom frame comprises two bottom frames with one ends hinged, the other ends of the two bottom frames are hinged to the two vertical frames respectively, and when the cart frame is in an unfolded state, the two vertical frames are folded. The hinged ends of the two bottom frames interact to achieve lower limiting, at least one side of the vertical frame is provided with a supporting frame, the supporting frame comprises two connecting rods and two connecting rod assemblies, one ends of the two connecting rods are hinged, and the other ends of the two connecting rods are hinged to the two bottom frames respectively to form a V-shaped connecting rod structure; one ends of the two connecting rod assemblies are hinged to the V-shaped connecting rod structure, the other ends of the two connecting rod assemblies are connected to the two vertical frames respectively to form movable ends, and the movable ends can rotate relative to the vertical frames and can slide in the length direction of the vertical rods; the whole frame has good stability in the unfolded state and is not prone to shaking in the using process.

Description

Technical Field

[0001] The utility model relates to the technical field of carts, in particular to a flat-folding cart frame and a cart. Background Art

[0002] A cart, as a transport tool, is widely used in daily life. The cart mainly includes a frame and a flexible bag. In related technologies, in order to facilitate carrying or packaging of the cart, the cart is usually designed to be a foldable structure, for example, the frame is designed to be a flat-foldable structure.

[0003] In addition, the frames of some carts are designed to be frameless structures, that is, the side frames of the carts only include vertical frames on the front and rear sides, and there is almost no frame structure on the left and right sides. For example, the simple hand-pull folding cart disclosed in the patent document with application number 202222858521.3, although this folding cart can be folded, it still has shortcomings in practical applications. For example, its stability in use is poor. Specifically, it mainly adopts a symmetrically arranged and vertically parallel support structure to achieve the support of the front and rear vertical frames. This vertically parallel structure is still a four-bar linkage in principle, and the four-bar linkage itself is an unstable support structure. As a result, the stability of the frame is poor when it is unfolded and used, and there will be a lot of shaking, so it needs to be improved. Utility Model Content

[0004] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present utility model is to provide a flat-folding stroller frame and a stroller.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] On the one hand, the utility model provides a foldable cart frame, comprising two vertical frames arranged opposite to each other and having rollers at the bottom, a foldable bottom frame is provided between the two vertical frames, the bottom frame comprises two bottom frames hinged at one end, the other ends of the two bottom frames are respectively hinged to the two vertical frames, when the frame is in an unfolded state, the hinged ends of the two bottom frames interact with each other to achieve a lower limit, at least one side of the vertical frame is provided with a support frame, the support frame comprises two connecting rods and two connecting rod assemblies, one end of the two connecting rods is hinged to each other and the other ends are respectively hinged to the two bottom frames to form a V-shaped connecting rod structure; one end of the two connecting rod assemblies is hinged to the V-shaped connecting rod structure, and the other ends of the two connecting rod assemblies are respectively connected to the two vertical frames to form a movable end, the movable end can rotate relative to the vertical frame and can slide along the length direction of the vertical rod.

[0007] Compared with the prior art, the advantages of adopting this solution are:

[0008] The present solution provides a support frame so that the frame can have good stability in the unfolded state. Specifically, when the frame is in the unfolded state, the hinged ends of the two bottom frames interact with each other to achieve a lower limit, so that the bottom frames cannot continue to flip downward; at the same time, the V-shaped connecting rod structure formed by the two connecting rods forms a triangular supporting structure with the two bottom frames, so that the mutual hinged parts of the two bottom frames form a certain self-locking force to limit the two bottom frames from flipping upward. In this way, when the frame is in the unfolded state, the two bottom frames are in a stable state, and then stably support the vertical frames on both sides, so that the entire frame has good stability in the unfolded state and is not easy to shake during use.

[0009] As an optional embodiment of the present invention, the connecting rod assembly includes a first connecting rod and a second connecting rod, and one end of the first connecting rod and the second connecting rod are hinged; the middle part of the first connecting rod is hinged to the bottom frame, and the end of the first connecting rod away from the second connecting rod can rotate relative to the vertical frame and can slide along the length direction of the vertical rod; in the two connecting rod assemblies, the ends of the two second connecting rods away from the first connecting rod are hinged to the V-shaped connecting rod structure.

[0010] As an optional implementation manner of the present invention, when the vehicle frame is in the unfolded state, in the vertical direction, the second connecting rod is lower than the bottom frame, and both connecting rods extend downwardly from the bottom frame.

[0011] As an optional implementation manner of the present invention, the rotation axis of the mutual hinge point of the two second connecting rods coincides with the rotation axis of the mutual hinge point of the two connecting rods.

[0012] As an optional implementation of the present invention, one end of the first connecting rod away from the second connecting rod is hinged with a sliding sleeve, and the sliding sleeve is slidably arranged on the vertical frame along the length direction of the vertical frame.

[0013] As an optional implementation of the utility model, a limiting protrusion is provided on the vertical frame, and the limiting protrusion is located below the sliding sleeve and is used to block the sliding sleeve to limit the lowest position of the sliding sleeve sliding along the length direction of the vertical frame.

[0014] As an optional implementation of the utility model, a hinge seat is provided at one end of the two bottom frames that are close to each other, and the bottoms of the hinge seats are hinged. When the frame is in the unfolded state, the ends of the two hinge seats abut against each other to achieve the lower limit position of the two bottom frames.

[0015] As an optional implementation of the present invention, when the vehicle frame is in the unfolded state, the angle of the hinged position of the two bottom frames is 170°-180°.

[0016] As an optional implementation manner of the present utility model, the frame further includes a pull rod assembly.

[0017] On the other hand, the utility model provides a cart, comprising the above-mentioned flat-folding cart frame.

[0018] Other advantages and effects of the present invention are explained in detail in the specific implementation manner and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model in the unfolded state;

[0020] Figure 2 for Figure 1 A partial enlarged view of the middle hinge seat;

[0021] Figure 3 This is the main view of the utility model in the unfolded state;

[0022] Figure 4 It is a schematic diagram of the structure of the utility model during the folding process;

[0023] Figure 5 for Figure 4 The main view of

[0024] Figure 6 It is a structural schematic diagram of the utility model in a folded state. DETAILED DESCRIPTION

[0025] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0026] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operate in a specific direction. Therefore, it should not be understood as a limitation on the present invention.

[0027] Example 1

[0028] See also Figure 1-6 As shown, this embodiment provides a flat-folding cart frame, including two oppositely arranged vertical frames 1 with rollers 111 at the bottom. For the convenience of subsequent description, in this embodiment, as shown in FIG. Figure 1 As shown, the relative direction of the two vertical frames 1 is recorded as the first direction, and the direction horizontally perpendicular to the first direction is recorded as the second direction.

[0029] In some embodiments, two rollers 111 arranged side by side are disposed at the bottom of each vertical frame 1 .

[0030] In some embodiments, the frame 1 mainly includes two columns 11 arranged side by side, and a roller 111 is arranged at the bottom of each column 11; the frame 1 may also include an upper beam 12 and a bottom beam 13, the upper beam 12 is fixed between the tops of the two columns 11, and the bottom beam 13 is fixed between the bottoms of the two columns 11, and the two columns 11 are connected by the upper beam 12 and the bottom beam 13. It is worth noting that in some embodiments, the upper beam 12 may also be eliminated.

[0031] A foldable bottom frame 2 is provided between the two vertical frames 1, wherein the bottom frame 2 is provided at the lower part of the vertical frames 1; the bottom frame 2 is a structure capable of flipping and folding, and during the flipping and folding process, the bottom frame 2 drives the two vertical frames 1 to close together to realize the folding of the entire frame, presenting a Figure 6 Shown in folded state.

[0032] like Figure 1 As shown, the base frame 2 includes two base frames 21 connected in sequence along a first direction. In some embodiments, the base frames 21 are substantially in a rectangular frame structure.

[0033] One ends of the two bottom frames 21 are hinged to each other, and the relative rotation axis of the hinged joint is parallel to the second direction.

[0034] The other ends of the two bottom frames 21 (i.e., the ends of the two bottom frames 21 away from each other) are respectively hinged on the two vertical frames 1, for example, hinged on the bottom beam 13 of the vertical frame 1, or hinged on the two vertical columns 11. The rotation axis of the hinge point between the bottom frame 21 and the vertical frame 1 is parallel to the second direction.

[0035] like Figure 1 and Figure 2 As shown, when the vehicle frame is in the unfolded state, the hinged ends of the two bottom frames 21 interact with each other to achieve a lower limit. The lower limit here can be understood as limiting the two bottom frames 21 from further flipping downward, that is, when the two bottom frames 21 are in the lower limit position, the two bottom frames 21 cannot continue to flip downward.

[0036] In some embodiments, the lower limit structure of the two bottom frames 21 may be as follows: Figure 2 As shown, the ends of the two bottom frames 21 close to each other (which can also be understood as the ends of the two bottom frames 21 for being hinged to each other) are both fixed with hinge seats 211. The bottoms of the two hinge seats 211 are hinged to each other, so as to realize the mutual hinge of the two bottom frames 21.

[0037] In addition, when the frame is in the unfolded state, Figure 2As shown, the ends of the two hinged seats 211 abut against each other to achieve the lower limit of the two bottom frames 21. In other words, the two hinged ends are in a state of mutual conflict, so that the two bottom frames 21 cannot continue to flip downward, thereby achieving the purpose of the lower limit of the bottom frame 21.

[0038] As a preference, Figure 3 As shown, when the frame is in the unfolded state, the angle α of the hinged position of the two bottom frames 21 is 170°-180°. The angle α here can also be understood as the angle between the two hinge seats 211 when they are in the abutment state. In this way, the bottom frame 2 has better self-locking properties in the unfolded state.

[0039] like Figure 1 As shown, at least one side of the vertical frame 1 is provided with a support frame 3. Preferably, both sides of the vertical frame 1 are provided with a support frame 3, and the support frames 3 on both sides are arranged opposite to each other along the second direction. The two support frames 3 have basically the same structure, so this embodiment is specifically described below by taking one of them as an example:

[0040] like Figure 1-Figure 3 As shown, the support frame 3 includes two connecting rods 31 and two connecting rod assemblies 32. One end of the two connecting rods 31 is hinged to each other and the other end is hinged to the two bottom frames 21 respectively. Figure 2 As shown, the two connecting rods 31 are equivalent to forming a V-shaped connecting rod structure, and the two ends of the V-shaped two-rod structure are symmetrically hinged on both sides of the mutual hinge point of the two bottom frames 21.

[0041] It is worth noting that the rotation axis of the mutual hinge point of the two connecting rods 31 is parallel to the second direction.

[0042] One ends of the two connecting rod assemblies 32 are hinged to the V-shaped connecting rod structure, that is, one ends of the two connecting rod assemblies 32 are hinged to the V-shaped connecting rod structure around the same rotation axis, wherein the rotation axes of the two are parallel to the second direction.

[0043] Preferably, the rotation axis of the mutual hinge point of the two connecting rod assemblies 32 coincides with the rotation axis of the mutual hinge point of the two connecting rods 31 .

[0044] The other ends of the two connecting rod assemblies 32 (ie, the ends of the two connecting rod assemblies 32 that are away from each other) are respectively connected to the two vertical frames 1 to form movable ends. For example, the movable ends are connected to the columns 11 of the vertical frames 1 .

[0045] In addition, the movable end is configured to be rotatable relative to the vertical frame 1 and slidable along the length direction of the vertical rod, wherein the rotation axis of the movable end relative to the vertical frame 1 is parallel to the second direction.

[0046] Through the above arrangement, since the two bottom frames 21 can interact with each other (mainly relying on the mutual contact of the two hinged seats) to achieve the lower limit, at the same time, the V-shaped connecting rod structure formed by the two connecting rods 31 and the two bottom frames 21 are surrounded to form a triangular support structure, so that the mutual hinges of the two bottom frames 21 form a certain self-locking force to limit the two bottom frames 21 from flipping upward (which can be understood as the upper limit). In this way, when the frame is in the unfolded state, the two bottom frames 21 are in a stable state, and with the support of the connecting rod assembly 32, the vertical frames 1 on both sides are stably supported, so that the entire frame has good stability in the unfolded state and is not easy to shake during use.

[0047] When the frame needs to be folded, it is only necessary to apply force to pull the bottom frame 21 upward to overcome the self-locking force of the support frame 3 on the bottom frame 21 (mainly the self-locking force of the upper limit), so that the two bottom frames 21 can be driven to flip upward relative to each other and gradually move closer, thereby driving the two upright frames 1 to move closer to each other along the first direction. Figure 4 , Figure 5 The state shown; finally, it is fully folded and presented as Figure 6 Status shown.

[0048] In this embodiment, the structures of the connecting rod assemblies 32 are basically the same, so one of them is taken as an example for specific description in this embodiment:

[0049] In some embodiments, the connecting rod assembly 32 adopts a double connecting rod structure, specifically, Figure 1 As shown, the connecting rod assembly 32 includes a first connecting rod 321 and a second connecting rod 322. One end of the first connecting rod 321 and the second connecting rod 322 are hinged together, and the relative rotation axis of the two is parallel to the second direction.

[0050] In addition, the middle portion of the first connecting rod 321 is hinged to the bottom frame 21. It is worth noting that the middle portion here is not limited to the center position of the first connecting rod 321, but can be connected to other positions between the two ends of the first two rods, and the specific selection can be made according to actual needs.

[0051] One end of the first connecting rod 321 away from the second connecting rod 322 constitutes a movable end of the connecting rod assembly 32, which can rotate relative to the vertical frame 1 and can slide along the length direction of the vertical rod.

[0052] In some embodiments, in order to realize the above-mentioned structure of the movable end, a sliding sleeve 33 may be hinged to one end of the first connecting rod 321 away from the second connecting rod 322 , and the rotation axes of the two are parallel to the second direction.

[0053] In addition, the sliding sleeve 33 is slidably arranged on the vertical frame 1 along the length direction of the vertical frame 1, for example, Figure 1As shown, the sliding sleeve 33 is slidably installed on the column 11 of the vertical frame 1, so that it can slide along the length direction of the column 11. In addition, since the first connecting rod 321 is hinged to the sliding sleeve 33, the first connecting rod 321 can be flipped up and down relative to the sliding sleeve 33.

[0054] In the two-link assembly 32, one end of the two second links 322 away from the first link 321 is hinged to the aforementioned V-shaped link structure, that is, the two second links 322 are hinged at the hinge position of the two connecting rods 31. At this time, it is equivalent to the two second links 322 and the two connecting rods 31 being hinged at the same point and able to rotate around the same axis.

[0055] When the frame is folded, as the bottom frame 21 is pulled upward, the two connecting rods 31 will be pulled upward, thereby driving the two connecting rods 31 to flip relative to each other. In addition, the first connecting rod 321 and the second two rods are also pulled to flip relative to each other, so that the first connecting rod 321 pushes the sliding sleeve 33 to slide upward along the column 11 until the two upright frames 1 are close together to achieve folding.

[0056] In some embodiments, in order to achieve a frameless effect when the frame is unfolded, that is, the frame has almost no enclosure in the second direction, the frame is presented as follows: Figure 1 The connecting rod assembly 32 is constructed as follows:

[0057] When the frame is in the unfolded state, in the vertical direction, which can also be understood as the height direction of the frame, the second connecting rod 322 is lower than the bottom frame 21, and the two connecting rods 31 extend downwardly from the bottom frame 21. At this time, when the frame is in the unfolded state, the two sides of the frame are equivalent to only the left side part of the first connecting rod 321 being located on the upper side of the bottom frame 21, and the other positions are all in the lower position of the bottom frame 21, and do not constitute a fence, so as to achieve a frameless effect.

[0058] In addition, in order to facilitate pulling the frame to move forward, in some embodiments, the frame further includes a pull rod assembly 4, for example, the lower end of the pull rod assembly 4 is connected to the bottom beam 13 of the frame 1. The pull rod assembly 4 is preferably a retractable pull rod assembly 4, and its lower end is hinged to the bottom beam 13.

[0059] In addition, if Figure 1 As shown, the vertical frame 1 is provided with a limiting protrusion 112 , for example, the limiting protrusion 112 is fixed on the outer side wall of the column 11 .

[0060] The limiting protrusion 112 is located below the sliding sleeve 33, and is used to block the sliding sleeve 33 to limit the lowest position of the sliding sleeve 33 sliding along the length direction of the vertical frame 1. The lowest position here can be that when the frame is fully unfolded, the bottom of the sliding sleeve 33 just abuts against the top of the limiting protrusion 112. Of course, it is also possible that there is a slight gap between the bottom of the sliding sleeve 33 and the limiting protrusion 112.

[0061] The significance of setting the limiting protrusion 112 is to share the supporting burden of the first connecting rod 321. Assuming that there is no limiting protrusion 112, when the frame is in the unfolded state, since there is no limiting support at the bottom of the sliding sleeve 33, once the roller 111 encounters an obstacle, the force transmitted to the first connecting rod 321 is completely borne by the first connecting rod 321 itself. After the limiting protrusion 112 is set, the limiting protrusion 112 can block the sliding sleeve 33 so that it cannot continue to slide down, thereby sharing a part of the force transmitted to the first connecting rod 321, thereby reducing the burden of the first connecting rod 321, which is beneficial to protecting the first connecting rod 321.

[0062] Example 2

[0063] This embodiment further provides a cart based on the embodiment 1, which mainly includes a flexible cart bag (not shown in the figure) and the flat-folding cart frame provided in the embodiment 1. The cart bag is installed on the frame as a carrier for storing items.

[0064] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A flat-folding stroller frame, comprising two oppositely arranged vertical frames with rollers at the bottom, a foldable bottom frame is arranged between the two vertical frames, the bottom frame comprises two bottom frames hinged at one end, the other ends of the two bottom frames are respectively hinged to the two vertical frames, when the frame is in the unfolded state, the hinged ends of the two bottom frames interact with each other to achieve the lower limit, characterized in that: A support frame is provided on at least one side of the vertical frame, and the support frame includes two connecting rods and two connecting rod assemblies, one end of the two connecting rods is hinged to each other and the other end is respectively hinged to the two bottom frames to form a V-shaped connecting rod structure; one end of the two connecting rod assemblies is hinged to the V-shaped connecting rod structure, and the other end of the two connecting rod assemblies is respectively connected to the two vertical frames to form a movable end, and the movable end can rotate relative to the vertical frame and can slide along the length direction of the vertical rod.

2. A flat-folding stroller frame according to claim 1, characterized in that: The connecting rod assembly includes a first connecting rod and a second connecting rod, and one end of the first connecting rod and the second connecting rod are hinged; the middle part of the first connecting rod is hinged to the bottom frame, and the end of the first connecting rod away from the second connecting rod can rotate relative to the vertical frame and can slide along the length direction of the vertical rod; in the two connecting rod assemblies, the ends of the two second connecting rods away from the first connecting rod are hinged to the V-shaped connecting rod structure.

3. A flat-folding stroller frame according to claim 2, characterized in that: When the vehicle frame is in the unfolded state, in the vertical direction, the second connecting rod is lower than the bottom frame, and both connecting rods extend downwardly from the bottom frame.

4. A flat-folding stroller frame according to claim 2, characterized in that: The rotation axis of the mutual hinge point of the two second connecting rods coincides with the rotation axis of the mutual hinge point of the two connecting rods.

5. A flat-folding stroller frame according to claim 2, characterized in that: A sliding sleeve is hinged at one end of the first connecting rod away from the second connecting rod, and the sliding sleeve is slidably arranged on the vertical frame along the length direction of the vertical frame.

6. A flat-folding stroller frame according to claim 5, characterized in that: The vertical frame is provided with a limiting protrusion, and the limiting protrusion is located below the sliding sleeve and is used to block the sliding sleeve to limit the lowest position of the sliding sleeve sliding along the length direction of the vertical frame.

7. A flat-folding stroller frame according to claim 1, characterized in that: A hinge seat is provided at one end of the two bottom frames that are close to each other, and the bottoms of the hinge seats are hinged. When the frame is in an unfolded state, the ends of the two hinge seats abut against each other to achieve the lower limit position of the two bottom frames.

8. The flat-folding stroller frame according to claim 1, characterized in that: When the vehicle frame is in the unfolded state, the angle of the hinged position of the two bottom frames is 170°-180°.

9. A flat-folding stroller frame according to claim 1, characterized in that: The frame also includes a tie rod assembly.

10. A cart, characterized in that: It comprises a flat-folding stroller frame as described in any one of claims 1-9.

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