A flat folding cart

Abstract

The utility model relates to the technical field of carts, and specifically to a flat-folding cart, comprising two vertical frames arranged opposite to each other and two side frames arranged opposite to each other, the two vertical frames and the two side frames together form a frame, and a bottom frame is provided at the bottom of the frame; the side frames include two folding frames, and the folding frames include connecting rods, struts and pull rods; one end of the connecting rod is hinged to the vertical frame and forms a first hinge point; the connecting rod is provided with a sliding member that can slide along the length direction of the connecting rod, and a positioning member that limits the maximum downward sliding position of the sliding member; one end of the strut is hinged to the sliding sleeve, and the other end is hinged to the vertical frame to form a second hinge point; one end of the pull rod is hinged to the sliding sleeve, and the other end is hinged to the bottom frame; in the same side frame, the ends of the two connecting rods away from the vertical frame are hinged; in this scheme, the height of the cart in the folded state will not increase compared with the height in the unfolded state, which is conducive to packaging or storing the folded cart.

Description

Technical Field

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

[0002] A cart, also known as a handcart or a handcart, is mainly used to transport objects over short distances and is widely used in daily life.

[0003] In order to facilitate the storage or packaging of the cart, some carts in the related art are designed to be foldable. For example, a foldable cart mainly comprises a foldable frame formed by a multi-link folding mechanism. When folding is required, the frame can be folded and closed along its length direction to achieve folding; Related technologies: CN207481955U, CN115107841A and other patent documents.

[0004] Although the existing flat-folding cart can be folded flat, it still has defects in practical applications. For example, the height of the flat-folding cart in the folded state is higher than that in the unfolded state, so that the height of the folded cart is relatively high, which is not conducive to storage or packaging. Therefore, there is still room for improvement. Utility Model Content

[0005] 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.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A folding cart comprises two vertical frames arranged opposite to each other and two side frames arranged opposite to each other, the two vertical frames and the two side frames together form a frame, the bottom of the frame is provided with a bottom frame which can be flipped and folded upwards; the bottom of the vertical frame is provided with rollers, and the side frames include two folding frames, and the folding frames include connecting rods, struts and pull rods; one end of the connecting rod is hinged to the vertical frame to form a first hinge point; the connecting rod is provided with a sliding member which can slide along the length direction of the connecting rod, and a positioning member which limits the maximum downward sliding position of the sliding member; one end of the strut is hinged to the sliding sleeve, and the other end is hinged to the vertical frame to form a second hinge point; the first hinge point is located below the second hinge point; one end of the pull rod is hinged to the sliding sleeve, and the other end is hinged to the bottom frame; in the same side frame, the two connecting rods are hinged at the ends away from the vertical frame.

[0008] As an optional implementation of the present invention, the hinge point between the sliding member and the support rod coincides with the hinge point between the sliding member and the pull rod.

[0009] As an optional embodiment of the utility model, the sliding member includes a sliding sleeve slidably inserted on the connecting rod, and / or the positioning member includes a positioning sleeve fixedly inserted on the connecting rod. When the sliding sleeve slides downward along the connecting rod to the positioning sleeve position, the positioning sleeve resists the sliding sleeve to limit the sliding sleeve from continuing to slide down.

[0010] As an optional implementation of the utility model, the base frame includes two bottom frames, one ends of the two bottom frames are hinged to each other, and the other ends of the two bottom frames are respectively hinged to the two vertical frames.

[0011] As an optional implementation manner of the present invention, when the sliding frame slides to the maximum downward sliding position, the base frame is horizontally unfolded at the bottom of the frame.

[0012] As an optional implementation of the present invention, the two frames, one of which constitutes a front frame and the other constitutes a rear frame, the front frame and / or the rear frame are in an inverted U-shaped structure.

[0013] As an optional implementation of the utility model, the flat-folding cart further includes a pull rod assembly that can be extended and retracted along its own length direction.

[0014] As an optional implementation of the utility model, two rollers are provided at the bottom of each frame, and the rollers on the two frames are staggered. When the flat-folding cart is in the folded state, the two rollers at the bottom of one frame can be accommodated between the two rollers at the bottom of the other frame.

[0015] Compared with the prior art, the advantages of adopting this solution are:

[0016] Firstly, the structure of the side frame in the present solution enables the cart to be folded flat, and after the cart is folded flat, its height does not increase compared to the height of the cart in the unfolded state, which is conducive to packaging or storing the folded cart.

[0017] Secondly, when the cart in this solution is in the unfolded state, the support rod, the connecting rod and the vertical frame will form a triangular support structure. At the same time, the connecting rod, the base frame and the pull rod will also form a triangular support structure. In addition, the two connecting rods and the base frame form an A-type support structure, which is conducive to ensuring the stability of the cart in the unfolded state.

[0018] Finally, in this solution, the setting of the sliding member and the positioning member makes it possible for the sliding member to slide down along the connecting rod under the action of the load-bearing and self-weight of the cart after it is unfolded, and then to abut against the positioning member, so that the sliding member is positioned without continuing to slide down, thereby limiting the freedom of the sliding sleeve to slide downward, realizing the self-locking function, and allowing the cart to remain in the unfolded state. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 2 This is the main view of the utility model in the unfolded state;

[0021] Figure 3 This is a schematic diagram of the structure of the utility model in the folding process;

[0022] Figure 4 This is the front view of the utility model in a folded state;

[0023] Figure 5 It is a structural schematic diagram of the utility model in a folded state. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] See also Figure 1-5 As shown, this embodiment provides a flat-folding cart, including two vertical frames 100 arranged opposite to each other and two side frames 200 arranged opposite to each other. The two vertical frames 100 and the two side frames 200 are combined to form a frame.

[0027] Specifically, Figure 1 As shown, in the unfolded state, the two upright frames 100 are arranged opposite to each other along the length direction of the cart, and the two side frames 200 are arranged opposite to each other along the width direction of the cart, so that the two upright frames 100 and the two side frames 200 together form an approximately rectangular frame. The bottom of the frame is provided with a bottom frame 300 that can be flipped and folded upward.

[0028] At this time, one of the two frames 100 constitutes the front frame of the cart (such as Figure 1 The other forms the rear frame of the cart (as shown in Figure 1 The two side frames 200 respectively constitute the side walls of the cart. It is understood that the cart also includes a bag (not shown in the figure) mounted on the frame in actual use, and the bag is used as a carrier for storing items.

[0029] In this embodiment, both of the two stands 100 are inverted U-shaped structures, and two rollers 10 are provided at the bottom of each stand 100 so that the cart can be pushed or pulled for transportation.

[0030] The structures of the two side frames 200 in this embodiment are basically the same, so in this embodiment, one of the side frames 200 is taken as an example for specific description:

[0031] Combination Figure 2 As shown, the side frame 200 includes two folding frames 20 , which are connected in sequence along the length direction of the cart, and the two ends of the side frame 200 are hinged on the two upright frames 100 respectively.

[0032] The structures of the two folding frames 20 are basically the same, and one of them is taken as an example for specific description below:

[0033] like Figure 2 As shown, the folding frame 20 includes a connecting rod 21, a support rod 22 and a pull rod 23; one end of the connecting rod 21 is hinged to the stand 100 to form a first hinge point J1, and the connecting rod 21 and the stand 100 can rotate relative to each other based on the first hinge point J1, wherein the first hinge point J1 is located at the bottom of the stand 100.

[0034] The connecting rod 21 is provided with a sliding member capable of sliding along the length direction of the connecting rod 21 , and a positioning member for limiting the maximum downward sliding position of the sliding member.

[0035] The maximum downward sliding position here can be understood as: the sliding member can slide along the length direction of the connecting rod 21; downward sliding, that is, sliding downward, can be understood as the sliding member sliding along the connecting rod 21 toward the first hinge point J1, and vice versa, it is considered to be sliding upward; so the maximum downward sliding position can be considered as the maximum position to which the sliding member can slide down. When the sliding member slides to this position, the sliding member cannot continue to slide down under the restriction of the positioning member. At this time, the cart is in a fully unfolded state, such as Figure 1 Status shown.

[0036] One end of the support rod 22 is hinged to the sliding member, and the other end of the support rod 22 is hinged to the stand 100 to form a second hinge point J2. The support rod 22 and the stand 100 can rotate relative to each other based on the second hinge point J2; wherein the first hinge point J1 is located below the second hinge point J2.

[0037] One end of the pull rod 23 is hinged to the sliding member, and the other end is hinged to the base frame 300 to form a fourth hinge point J4; the pull rod 23 and the base frame 300 can rotate relative to each other based on the fourth hinge point J4.

[0038] Preferably, the hinge point between the sliding member and the strut 22 and the hinge point between the sliding member and the pull rod 23 coincide with each other, and the hinge point is recorded as the third hinge point J3, so that both the pull rod 23 and the strut 22 can rotate relative to the sliding member based on the third hinge point J3.

[0039] The aforementioned coincidence of hinge points can be understood as the relative rotation axis of the sliding member and the strut 22 coincides with the rotation axis of the sliding member and the pull rod 23. For example, the strut 22 and the pull rod 23 are rotatably connected to the sliding member via the same rivet.

[0040] Of course, in other optional embodiments, the hinge point between the sliding member and the support rod 22 and the hinge point between the sliding member and the pull rod 23 may not coincide with each other. For example, the two hinge points are staggered up and down, or one is in the center and the other is on the upper or lower side.

[0041] In addition, in the same side frame 200, the ends of the two connecting rods 21 away from the vertical frame 100 are hinged.

[0042] With the above settings, Figure 3 As shown, when the bottom frame 300 is turned up and folded, the bottom frame 300 pulls the pull rod 23 to move upward, and the pull rod 23 pushes the sliding member to slide upward along the connecting rod 21, thereby driving the support rod 22 and the connecting rod 21 to turn toward the stand 100 until the two sliding members on the two connecting rods 21 collide with each other. At this time, the two sliding members interfere with each other and stop sliding, and the folding of the cart is achieved. Figure 4 As shown, when the cart is in the folded state, the two upright frames 100 are approximately parallel to each other.

[0043] The advantage of adopting the side frame 200 structure to realize the flat folding of the cart is that after the cart is folded flat, its height will not increase compared to the height of the cart in the unfolded state. In other words, when the cart is in the unfolded state, its height can be considered as the height of the stand 100, and when the cart is in the folded state, its height will not exceed the height of the stand 100, so the height will not increase, and the height of the cart is still the height of the stand 100, which is conducive to packaging or storing the folded cart.

[0044] Moreover, if Figure 1 and Figure 2 As shown, when the cart is in the fully unfolded state, the support rod 22, the connecting rod 21 and the stand 100 will form a triangular support structure, and the triangular support structure has the first hinge point J1, the second hinge point J2 and the third hinge point J3 as the vertices of the triangle.

[0045] At the same time, the connecting rod 21, the base frame 300 and the pull rod 23 will also form a triangular support structure, and the triangular support structure has the first hinge point J1, the third hinge point J3 and the fourth hinge point J4 as the vertices of the triangle.

[0046] In addition, the two connecting rods 21 and the base frame 300 together form an A-shaped support structure.

[0047] The triangular support structure and the A-type support structure make the cart more stable when unfolded.

[0048] Finally, the arrangement of the sliding member and the positioning member enables the sliding member to slide down along the connecting rod 21 and then abut against the positioning member after the cart is unfolded, under the action of the cart's load and / or its own weight, so that the sliding member is positioned without continuing to slide down, thereby limiting the freedom of the sliding sleeve 24 to slide downward, realizing the self-locking function, and allowing the cart to remain in the unfolded state.

[0049] In this embodiment, the sliding member includes a sliding sleeve 24 that is slidably inserted into the connecting rod 21 , and the sliding sleeve 24 can slide along the length direction of the connecting rod 21 .

[0050] The positioning member includes a positioning sleeve 25 fixedly inserted on the connecting rod 21, wherein the positioning sleeve 25 can be fixed to the connecting rod 21 by rivets, screws or welding.

[0051] The position of the positioning sleeve 25 on the connecting rod 21 determines the maximum downward position of the sliding sleeve 24. When the sliding sleeve 24 slides downward along the connecting rod 21 to the position of the positioning sleeve 25, as shown in FIG. Figure 2 As shown, the positioning sleeve 25 abuts against the sliding sleeve 24 to limit the sliding sleeve 24 from further sliding down, and the cart is in a fully unfolded state at this time; in this state, it is preferred that the base frame 300 is basically horizontally unfolded at the bottom of the frame.

[0052] In this embodiment, Figure 1 As shown, the structure of the bottom frame 300 is as follows: the bottom frame 300 includes two bottom frames 30, and the two bottom frames 30 are sequentially connected along the length direction of the cart. Specifically, one end of the two bottom frames 30 is hinged, and the other ends of the two bottom frames 30 are respectively hinged on the two upright frames 100. The two pull rods 23 in the same side frame 200 are respectively hinged to the two bottom frames 30.

[0053] In addition, to facilitate pushing / pulling the cart, e.g. Figure 1 As shown, the flat folding stroller also includes a rod assembly 400 that can be telescopic along its length direction, and the lower end of the rod assembly 400 can be hinged or fixed to the bottom of the front frame. This telescopic rod assembly 400 has many applications in existing folding strollers and will not be described in detail here.

[0054] In this embodiment, two rollers 10 are disposed at the bottom of each stand 100, and the rollers 10 on the two stands 100 are staggered. Figure 1As shown, the distance between the two rollers 10 of the front frame b is smaller than the distance between the two rollers 10 of the rear frame a, and in the projection in the length direction of the cart, the two rollers 10 of the front frame a are located between the two rollers 10 of the rear frame b; in this way, when the flat-folding cart is in the folded state, the two rollers 10 at the bottom of one frame 100 can be partially accommodated between the two rollers 10 at the bottom of the other frame 100, that is, a part of the two rollers 10 of the front frame a are accommodated between the two rollers 10 of the rear frame b, which is beneficial to reduce the thickness of the cart in the folded state.

[0055] 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 foldable cart, comprising two vertical frames arranged opposite to each other and two side frames arranged opposite to each other, the two vertical frames and the side frames together form a frame, the bottom of the frame is provided with a bottom frame that can be flipped and folded upward; the bottom of the vertical frame is provided with rollers, characterized in that: The side frame includes two folding frames, which include connecting rods, struts and pull rods; one end of the connecting rod is hinged to the vertical frame to form a first hinge point; the connecting rod is provided with a sliding member that can slide along the length direction of the connecting rod, and a positioning member that limits the maximum downward sliding position of the sliding member; one end of the strut is hinged to the sliding sleeve, and the other end is hinged to the vertical frame to form a second hinge point; the first hinge point is located below the second hinge point; one end of the pull rod is hinged to the sliding sleeve, and the other end is hinged to the base frame; in the same side frame, the two connecting rods are hinged at one end away from the vertical frame.

2. A flat-folding stroller according to claim 1, characterized in that: The hinge point between the sliding member and the support rod coincides with the hinge point between the sliding member and the pull rod.

3. A flat-folding stroller according to claim 1, characterized in that: The sliding member includes a sliding sleeve that is slidably inserted on the connecting rod, and / or the positioning member includes a positioning sleeve that is fixedly inserted on the connecting rod. When the sliding sleeve slides downward along the connecting rod to the positioning sleeve position, the positioning sleeve abuts against the sliding sleeve to limit the sliding sleeve from continuing to slide down.

4. A flat-folding stroller according to claim 1, characterized in that: The bottom frame comprises two bottom frames, one ends of the two bottom frames are hinged to each other, and the other ends of the two bottom frames are respectively hinged to two vertical frames.

5. A flat-folding stroller according to claim 1, characterized in that: When the sliding frame slides to the maximum downward position, the bottom frame is horizontally unfolded at the bottom of the frame.

6. A flat-folding stroller according to claim 1, characterized in that: Two upright frames, one of which constitutes a front upright frame and the other constitutes a rear upright frame, and the front upright frame and / or the rear upright frame are inverted U-shaped structures.

7. A flat-folding stroller according to claim 1, characterized in that: The flat-folding cart also includes a pull rod assembly that can be telescoped along the length direction of the cart.

8. The flat-folding stroller according to claim 1, characterized in that: Two rollers are arranged at the bottom of each stand, and the rollers on the two stands are staggered. When the flat-folding cart is in a folded state, the two rollers at the bottom of one stand can be accommodated between the two rollers at the bottom of the other stand.

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