Folding cart

Abstract

The utility model discloses a folding cart which comprises wheels installed on a pair of bases, each base is rotationally connected with an armrest frame through a first rotating shaft, a supporting assembly used for obliquely supporting the armrest frames is arranged between the bases and the armrest frames, and a bearing platform used for bearing people or articles is arranged between the two armrest frames. A first folding and unfolding device is connected between the two bases, and a second folding and unfolding device is connected between the two armrest frames. When the cart needs to be stored, only the supporting assemblies need to be removed, the armrest frames can fall down to abut against the bases, then the two armrest frames are drawn close to each other, the first folding and unfolding device and the second folding and unfolding device can be contracted, and therefore the two armrest frames and the two bases are drawn close to each other, and folding is completed. When the stroller needs to be unfolded, only the two armrest frames need to be pushed away, the first folding and unfolding device and the second folding and unfolding device can be unfolded, the two bases are unfolded, then the armrest frames are lifted upwards, the supporting assemblies are supported between the armrest frames and the bases, and unfolding of the stroller is completed.

Description

Technical Field

[0001] The present invention belongs to the field of transportation tools, and particularly relates to a folding trolley. Background Art

[0002] In today's society, with the acceleration of the aging process and the increasing demand of young families for baby care, walking aids for the elderly and baby strollers have become indispensable auxiliary tools in daily life. These devices play an important role in improving the convenience of movement and the comfort of life.

[0003] In a Chinese patent with the publication number CN221293737U and the invention name "A Folding Baby Stroller", a baby stroller is disclosed. The folding structure of the baby stroller involved in this patent includes multiple components such as connecting rods, sliders, card slots, and elastic members. Although these components can achieve the folding function of the stroller, the complex folding mechanism may cause the following problems:

[0004] 1. Increased failure rate. Multiple small moving parts may increase the probability of failure. Wear, misalignment, or jamming of the components may cause the folding function to fail, thus affecting the normal use of the stroller.

[0005] 2. Durability and safety issues. The folding structure mentioned in the patent involves multiple sliding mechanisms, and these complex mechanical structures may have a negative impact on the durability and safety of the stroller.

[0006] 3. Volume and weight. Although the folding mechanism is described in the patent, there may still be problems with volume and weight in its specific implementation. Even with the folding function, the complex structural design may result in a relatively large volume after folding, affecting the convenience of storage and carrying of the stroller. The added hardware such as the backrest may cause an increase in the overall weight of the stroller, which is not conducive to the user's carrying and handling.

[0007] 4. User-friendliness. Although the stroller design involved in this patent has functional innovations, there may still be room for improvement in terms of user-friendliness: for some user groups, such as the elderly or users with poor physical conditions, the complex folding and unfolding operations may cause inconvenience and a sense of insecurity. The complex structural design may make the maintenance and cleaning of the stroller more cumbersome, increasing the extra burden on the user.

[0008] 5. Complex operations are required for folding and unfolding.

[0009] 6. Cost increase. The complex folding mechanism may lead to an increase in manufacturing costs.

[0010] In the Chinese patent with the publication number CN214356150 and the invention name "A Foldable Mobility Aid for the Elderly", a foldable mobility aid for the elderly is disclosed. The two first frame components on both sides are connected by a cross-bar bracket, and the cross-bar bracket can rotate around its rotation axis, so that the two first frame components on both sides can be folded close to each other. However, after being stored, only the width is reduced, and the length and height are not reduced. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to provide a folding cart that is convenient and quick to fold and unfold, has a simple structure and low failure rate, a small volume after folding, and a light overall weight, in view of the current situation of the above-mentioned prior art.

[0012] The technical solution adopted by the present invention to solve the above technical problems is as follows: A folding cart includes wheels installed on a pair of bases. Each base is rotatably connected to an armrest frame through a first rotating shaft. A support assembly for tilting and propping up the armrest frame is provided between the base and the armrest frame. A support platform for supporting people or items is provided between the two armrest frames; a first folding and unfolding device is connected between the two bases, and a second folding and unfolding device is connected between the two armrest frames. When the cart needs to be stored, just remove the support assembly, and the armrest frame can fall close to the base. Then, bring the two armrest frames closer to each other, and the first folding and unfolding device and the second folding and unfolding device will contract, so that the two armrest frames and the two bases are close to each other to complete the folding; when the cart needs to be unfolded, just push the two armrest frames apart, and the first folding and unfolding device and the second folding and unfolding device will unfold, so that the two bases also unfold from each other. Then, lift the armrest frame upward so that the support assembly supports between the armrest frame and the base to complete the unfolding of the cart.

[0013] In a preferred embodiment, the support assembly includes a first side rod rotatably connected to the armrest frame and a second side rod rotatably connected to the base, and a second rotating shaft is connected between the first side rod and the second side rod. The support assembly can be connected to the armrest frame and the base without being lost, and can be smoothly connected during the folding process.

[0014] In a preferred embodiment, the support assembly is provided with a first anti-overrun rotation structure to prevent the second rotating shaft from continuing to move away from the first rotating shaft after the armrest frame is fully unfolded. In order to increase the supporting ability of the support assembly, the support assembly is arranged at the rear section close to the base. If the first side rod and the second side rod are folded towards the first rotating shaft direction, the second rotating shaft will protrude backward, resulting in an increase in volume.

[0015] Another embodiment of the support assembly includes a first side rod rotatably connected to the armrest frame. A guide post is provided at the free end of the first side rod, and a guide groove for the guide post to slide is provided on the base.

[0016] In a preferred embodiment, the first deployment and retraction device is a link folding mechanism, including a first body rotatably connected to the base, and a second body that moves away from and towards the first body during deployment and retraction. The second body can also be suspended.

[0017] In a preferred embodiment, a short rod is rotatably connected to the second body, and a third rotating shaft is connected between the short rod and the base.

[0018] In a preferred embodiment, a limiting member is provided between the second body and the base to limit the over-expansion of the first deployment and retraction device, otherwise the distance between the two bases during expansion is too large.

[0019] In a preferred embodiment, the second deployment and retraction device includes a first folding rod rotatably connected to one side armrest, and a second folding rod rotatably connected to the other side armrest. A fourth rotating shaft is connected between the first folding rod and the second folding rod, and the fourth rotating shaft is perpendicular to the armrest.

[0020] In a preferred embodiment, the second deployment and retraction device is provided with a second anti-over-rotation structure to prevent the fourth rotating shaft from moving towards the first rotating shaft when the first folding rod and the second folding rod are folded.

[0021] In a preferred embodiment, the second deployment and retraction device is located between the support platform and the first deployment and retraction device. In the deployed state, if the second deployment and retraction device is accidentally folded, it will also be restricted by the support platform. The support platform is flexible, foldable or detachable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model;

[0023] Figure 2 is Figure 1 exploded schematic diagram of;

[0024] Figure 3 is an assembly structural diagram between the armrest and the second deployment and retraction device in Embodiment 1;

[0025] Figure 4 is following Figure 3 state folding and storage working schematic diagram;

[0026] Figure 5 is an assembly structural diagram between the base and the first deployment and retraction device in Embodiment 1;

[0027] Figure 6 is is following Figure 5 state folding and storage working schematic diagram;

[0028] Figure 7 is an assembly structural diagram between the base and the first deployment and retraction device in Embodiment 2;

[0029] Figure 8 It is a schematic diagram of the support component propping up the armrest frame when the trolley is in the unfolded state in the third embodiment;

[0030] Figure 9 It is a schematic diagram of the support component propping up the armrest frame when the trolley is in the folded and stored state in the third embodiment;

[0031] Figure 10 It is a schematic diagram of the structure of the elderly walking aid. Detailed implementation manners

[0032] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] The reference numerals therein are: base 1, guide groove 11, first rotating shaft 12, first retractable device 2, first section 21, second section 22, short rod 23, third rotating shaft 24, armrest frame 3, second retractable device 4, first folding rod 41, second folding rod 42, fourth rotating shaft 43, support component 5, first side rod 51, second side rod 52, second rotating shaft 53, guide post 54, supporting platform 6, first anti-overlimit rotation structure 7, limiting member 8, protrusion 81, groove 82, second anti-overlimit rotation structure 9, first step 91, second step 92.

[0034] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0035] It should be noted that the term "including" and any deformation thereof in the description and claims of the present application and the above-mentioned accompanying drawings are intended to cover non-exclusive inclusion. For example, a product including a series of units does not necessarily be limited to those units clearly listed, but may include other units not clearly listed or inherent to these products.

[0036] In the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0037] Moreover, in addition to being used to indicate orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances. In the embodiments, "rotational connection" means that two components are connected by a shaft.

[0038] In addition, the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Embodiment 1, as Figures 1 to 6 shown, a folding cart includes wheels mounted on a pair of bases 1. Each base 1 is rotationally connected to an armrest frame 3 through a first rotating shaft 12. A support assembly 5 for tilting and propping up the armrest frame 3 is provided between the base 1 and the armrest frame 3. A support platform 6 for supporting people or items is provided between the two armrest frames 3; a first expansion and contraction device 2 is connected between the two bases 1, and a second expansion and contraction device 4 is connected between the two armrest frames 3. When the cart needs to be stored, just remove the support assembly 5, and the armrest frame 3 can fall close to the base 1. Then, bring the two armrest frames 3 closer to each other, and the first expansion and contraction device 2 and the second expansion and contraction device 4 will contract, so that the two armrest frames 3 and the two bases 1 are closer to each other to complete folding; when the cart needs to be unfolded, just push the two armrest frames 3 apart, and the first expansion and contraction device 2 and the second expansion and contraction device 4 will expand, so that the two bases 1 also expand. Then, lift the armrest frame 3 upward so that the support assembly 5 supports between the armrest frame 3 and the base 1 to complete the unfolding of the cart.

[0040] In the embodiment, the support assembly 5 includes a first side rod 51 rotationally connected to the armrest frame 3 and a second side rod 52 rotationally connected to the base 1. A second rotating shaft 53 is connected between the first side rod 51 and the second side rod 52. The support assembly 5 can be connected to the armrest frame 3 and the base 1 without being lost, and can be smoothly connected during the folding process.

[0041] In the embodiment, as Figure 5 shown, the support assembly 5 is provided with a first anti-overlimit rotation structure 7 to prevent the second rotating shaft 53 from continuing to move away from the first rotating shaft 12 after the armrest frame 3 is fully unfolded. In order to increase the supporting ability of the support assembly 5, the support assembly 5 is arranged at the rear section close to the base 1. If the first side rod 51 and the second side rod 52 are folded toward the first rotating shaft 12, then the second rotating shaft 53 will protrude backward, resulting in an increase in volume.

[0042] In the embodiment, as Figure 5 and Figure 6 shown, the first unfolding and folding device 2 is a link folding mechanism, including a first section body 21 rotatably connected to the base 1, and a second section body 22 that moves away from and approaches the first section body 21 during the unfolding and folding movement.

[0043] In the embodiment, as Figure 5 and Figure 6 shown, a short rod 23 is rotatably connected to the second section body 22, and a third rotating shaft 24 is connected between the short rod 23 and the base 1.

[0044] In the embodiment, as Figure 5 and Figure 6 shown, a limiting member 8 is provided between the second section body 22 and the base 1. The limiting member 8 includes a protrusion 81 provided on the second section body 22 and a groove 82 provided on the base. When the first unfolding and folding device 2 is unfolded, the protrusion 81 will snap into the groove 82.

[0045] In the embodiment, as Figure 3 and Figure 4 shown, the second unfolding and folding device 4 includes a first folding rod 41 rotatably connected to one side armrest 3 and a second folding rod 42 rotatably connected to the other side armrest 3. A fourth rotating shaft 43 is connected between the first folding rod 41 and the second folding rod 42, and the fourth rotating shaft 43 is perpendicular to the armrest 3.

[0046] In the embodiment, as Figure 3 and Figure 4 shown, the second unfolding and folding device 4 is provided with a second anti-overlimit rotation structure 9 for preventing the fourth rotating shaft 43 from moving towards the first rotating shaft 12 when the first folding rod 41 and the second folding rod 42 are folded. The second anti-overlimit rotation structure 9 can take various forms. Here, the second anti-overlimit rotation structure 9 includes a first step 91 provided on the first folding rod 41 and a second step 92 provided on the second folding rod 42. When the first folding rod 41 and the second folding rod 42 are fully unfolded, the first step 91 abuts against the second step 92, preventing the first folding rod 41 and the second folding rod 42 from rotating beyond the limit.

[0047] In the embodiment, as Figure 1 shown, the second unfolding and folding device 4 is located between the supporting platform 6 and the first unfolding and folding device 2. In the unfolded state, if the second unfolding and folding device 4 is accidentally folded, it will also be restricted by the supporting platform 6. The supporting platform 6 is flexible or foldable or detachable.

[0048] Embodiment 2. The structure of Embodiment 2 is similar to that of Embodiment 1, except for the structure of the first unfolding and folding device 2, which is composed of multiple short rods to form a link folding net, as Figure 7 shown.

[0049] Embodiment 3. The structure of Embodiment 3 is similar to that of Embodiment 1, except for the support component 5. The support component 5 of Embodiment 3 includes a first side rod 51 rotatably connected to the armrest frame 3. A guide post 54 is provided at the free end of the first side rod 51, and a guide groove 11 for the guide post 54 to slide is provided on the base 1, as Figure 8 and Figure 9 shown.

[0050] All embodiments can be used on baby strollers and walking aids for the elderly. It only needs to replace the detachable or foldable supporting platform 6 according to requirements. The connection method with the armrest frame 3 can be selected from well-known methods such as snap-fastening and pin insertion, as Figure 1 is a baby stroller, and the supporting platform 6 is a seat or used to transport items; Figure 10 is a walking aid for the elderly, and its supporting platform 6 is used to transport items.

[0051] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A folding cart comprising wheels mounted on a pair of bases (1), characterized in that: Each base (1) is rotatably connected to an armrest frame (3) via a first rotating shaft (12); a support assembly (5) for tilting and supporting the armrest frame (3) is provided between the base (1) and the armrest frame (3); a supporting platform (6) for supporting people or objects is provided between the two armrest frames (3); a first retractable and extendable device (2) is connected between the two bases (1); and a second retractable and extendable device (4) is connected between the two armrest frames (3).

2. A folding cart according to claim 1, characterized in that: The support assembly (5) comprises a first side rod (51) rotatably connected to the handrail frame (3), and a second side rod (52) rotatably connected to the base (1), and a second rotating shaft (53) is connected between the first side rod (51) and the second side rod (52).

3. A folding cart according to claim 2, characterized in that: The support assembly (5) is provided with a first anti-over-limit rotation structure (7) for preventing the second rotating shaft (53) from further moving away from the first rotating shaft (12) after the handrail frame (3) is fully unfolded.

4. A folding cart according to claim 1, characterized in that: The support assembly (5) comprises a first side rod (51) rotatably connected to the handrail frame (3), a guide column (54) is provided at the free end of the first side rod (51), and a guide groove (11) for the guide column (54) to slide is provided on the base (1).

5. A folding cart according to claim 1, characterized in that: The first folding and unfolding device (2) is a connecting rod folding mechanism, comprising a first section (21) rotatably connected to the base (1), and a second section (22) moving away from and close to the first section (21) during the folding and unfolding movement.

6. A folding cart according to claim 5, characterized in that: The second section (22) is rotatably connected to a short rod (23), and a third rotating shaft (24) is connected between the short rod (23) and the base (1).

7. A folding cart according to claim 6, characterized in that: A limiting member (8) is provided between the second section (22) and the base (1) for limiting the over-expansion of the first retractable and deployable device (2).

8. A folding cart according to claim 1, characterized in that: The second folding and unfolding device (4) comprises a first folding rod (41) rotatably connected to the handrail frame (3) on one side, and a second folding rod (42) rotatably connected to the handrail frame (3) on the other side, a fourth rotating shaft (43) is connected between the first folding rod (41) and the second folding rod (42), and the fourth rotating shaft (43) is perpendicular to the handrail frame (3).

9. A folding cart according to claim 8, characterized in that: The second folding and unfolding device (4) is provided with a second anti-over-limit rotation structure (9) for preventing the fourth rotating shaft (43) from moving toward the first rotating shaft (12) when the first folding rod (41) and the second folding rod (42) are folded.

10. A folding cart according to claim 9, characterized in that: The second retractable and deployable device (4) is located between the supporting platform (6) and the first retractable and deployable device (2).

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