Folding cart

Abstract

The utility model belongs to the technical field of trolleys, and particularly relates to a folding trolley. Comprising a foldable frame, the foldable frame comprises an upper folding frame, a lower folding frame and a supporting rod assembly, the supporting rod assembly is arranged between the upper folding frame and the lower folding frame, and a middle vertical rod serves as a core supporting body; the front sliding vertical rod and the rear sliding vertical rod are in sliding locking along the front lower rod and the rear lower rod in the unfolded state to form a dynamic triangular supporting structure, so that when the trolley is unfolded, the sliding ends of the front sliding vertical rod and the rear sliding vertical rod automatically slide to preset positions to form a stable mechanical supporting system. Linkage contraction of the supporting rod assembly is achieved in the folding process in a sliding installation mode, the multi-node operation complexity of a traditional fixed triangular supporting structure is avoided, and therefore the folding and unfolding actions are obviously simplified on the premise that the high bearing capacity is guaranteed, and the structural strength and operation convenience are improved; the fracture risk of the supporting rod is eliminated, and the use experience is optimized.

Description

Technical Field

[0001] This application belongs to the field of trolley technology, specifically relating to a folding trolley. Background Technology

[0002] Foldable strollers are now available on the market for easy storage. However, many strollers lack sufficient support when the folded frame is unfolded, making the support rods prone to damage or breakage when heavy objects are placed on them or children are riding in them, posing a safety hazard. To enhance overall structural stability, some strollers adopt a triangular support structure design. While this improves stability, it makes folding and unfolding complex and inconvenient. Utility Model Content

[0003] To address the problem that existing handcarts are prone to damage and breakage of support rods, resulting in inconvenience in use, this application provides a folding handcart.

[0004] This application is achieved through the following technical solution:

[0005] A folding trolley includes a foldable frame, the foldable frame comprising:

[0006] The upper folding frame includes a front upper rod, a rear upper rod, a front upper assembly connected to the front upper rod, a rear upper assembly connected to the rear upper rod, and an upper connecting rod that is hinged to the front upper assembly and the rear upper assembly respectively.

[0007] The lower folding frame includes a front lower rod, a rear lower rod, a front lower assembly connected to the front lower rod, a rear lower assembly connected to the rear lower rod, and a lower connecting rod that is hinged to the front lower assembly and the rear lower assembly respectively.

[0008] The support rod assembly includes an intermediate upright rod disposed between the upper folding frame and the lower folding frame, and a front sliding upright rod and a rear sliding upright rod respectively disposed on both sides of the intermediate upright rod. One end of the front sliding upright rod is hinged to the intermediate upright rod, and the other end is slidably mounted on the front lower rod along the length direction of the front lower rod. One end of the rear sliding upright rod is hinged to the intermediate upright rod, and the other end is slidably mounted on the rear lower rod along the length direction of the rear lower rod.

[0009] As described above, in a folding trolley, the front upper kit, the rear upper kit, the front lower kit, and the rear lower kit are provided with mounting ports for inserting one end of the front upper rod, the rear upper rod, the front lower rod, and the rear lower rod, respectively.

[0010] As described above, in a folding trolley, the upper connecting rod has upper hinge portions at both ends, the front upper kit and the rear upper kit have upper connecting portions that are hinged to the left and right sides of the upper hinge portions, the lower connecting rod has lower hinge portions at both ends, and the front lower kit and the rear lower kit have lower connecting portions that are hinged to the left and right sides of the lower hinge portions.

[0011] The folding trolley described above further includes a folding and releasing mechanism, which includes a front locking component for limiting the sliding of the front sliding upright along the length direction of the front lower rod, and a rear locking component for limiting the sliding of the rear sliding upright along the length direction of the rear lower rod.

[0012] As described above, in a folding trolley, the front locking assembly includes a first limiting member disposed on the front lower rod and used to limit the sliding end of the front sliding upright from sliding in a direction away from the lower connecting rod, and a first locking member disposed on the sliding end of the front sliding upright and used to limit the sliding end of the front sliding upright from sliding in a direction close to the lower connecting rod.

[0013] In a folding trolley as described above, the rear locking assembly includes a second limiting member disposed on the rear lower rod and used to limit the sliding end of the rear sliding upright from sliding in a direction away from the lower connecting rod.

[0014] As described above, in a folding trolley, the first locking member is provided with a first limiting hole, and the front lower rod is provided with a first limiting member corresponding to the first limiting hole. The first limiting member extends into the first limiting hole to restrict the sliding end of the front sliding upright from sliding in the direction close to the lower connecting rod. The first limiting member disengages from the first limiting hole to release the restriction on the sliding end of the front sliding upright from sliding in the direction close to the lower connecting rod.

[0015] The folding trolley described above further includes a wheel assembly, which includes a front wheel frame, a rear wheel frame, and wheels disposed on the front wheel frame and the rear wheel frame. The end of the upper front rod away from the middle upright and the end of the lower front rod away from the middle upright are respectively hinged to the front wheel frame, and the end of the upper rear rod away from the middle upright and the end of the lower rear rod away from the middle upright are respectively hinged to the rear wheel frame.

[0016] The folding trolley described above also includes a wheel assembly. The front wheel frame includes a front lower mounting portion, a front upper mounting portion, and a front wheel frame vertical bar connecting the front lower mounting portion and the front upper mounting portion. The rear wheel frame includes a rear lower mounting portion, a rear upper mounting portion, and a rear wheel frame vertical bar connecting the rear lower mounting portion and the rear upper mounting portion.

[0017] Compared with the prior art, this application has the following advantages:

[0018] This application discloses a folding trolley that utilizes a support rod assembly between the upper and lower folding frames. The central upright serves as the core support, and the front and rear sliding uprights, when unfolded, slide and lock along the lower front and rear rods to form a dynamic triangular support structure. This allows the sliding ends of the front and rear sliding uprights to automatically slide to predetermined positions when the trolley is unfolded, forming a stable mechanical support system. The hinged connection between the sliding and central uprights enhances the three-dimensional support strength of the frame and effectively disperses load stress. Furthermore, the sliding installation method enables the support rod assembly to retract in tandem during folding, avoiding the multi-node operational complexity of traditional fixed triangular support structures. This significantly simplifies the folding and unfolding process while maintaining high load-bearing capacity, achieving a dual improvement in structural strength and ease of operation. It eliminates the risk of support rod breakage and optimizes the user experience. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional perspective view of an embodiment of this application;

[0021] Figure 2 yes Figure 1 The main view;

[0022] Figure 3 yes Figure 1 A partially enlarged schematic diagram of the upper and middle connecting rod;

[0023] Figure 4 yes Figure 1 A partially enlarged schematic diagram of the lower connecting rod;

[0024] Figure 5 yes Figure 3 Exploded view;

[0025] Figure 6 yes Figure 4 Exploded view;

[0026] Figure 7 yes Figure 3 A diagram illustrating the folded state. Detailed Implementation

[0027] To make the technical problems solved by this application, the technical solutions, and the beneficial effects clearer, this application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0028] Please see Figures 1 to 7 A folding trolley includes a foldable frame, the foldable frame comprising:

[0029] The upper folding frame 1 includes a front upper rod 11, a rear upper rod 12, a front upper assembly 13 connected to the front upper rod 11, a rear upper assembly 14 connected to the rear upper rod 12, and an upper connecting rod 15 that is hinged to the front upper assembly 13 and the rear upper assembly 14 respectively.

[0030] The lower folding frame 2 includes a front lower rod 21, a rear lower rod 22, a front lower assembly 23 connected to the front lower rod 21, a rear lower assembly 24 connected to the rear lower rod 22, and a lower connecting rod 25 that is hinged to the front lower assembly 23 and the rear lower assembly 24 respectively.

[0031] The support rod assembly 3 includes an intermediate upright 31 disposed between the upper folding frame 1 and the lower folding frame 2, and a front sliding upright 32 and a rear sliding upright 33 respectively disposed on both sides of the intermediate upright 31. One end of the front sliding upright 32 is hinged to the intermediate upright 31, and the other end is slidably mounted on the front lower rod 21 along the length direction of the front lower rod 21. One end of the rear sliding upright 33 is hinged to the intermediate upright 31, and the other end is slidably mounted on the rear lower rod 22 along the length direction of the rear lower rod 22.

[0032] This application discloses a folding trolley that utilizes a support rod assembly between the upper and lower folding frames. The central upright serves as the core support, and the front and rear sliding uprights, when unfolded, slide and lock along the lower front and rear rods to form a dynamic triangular support structure. This allows the sliding ends of the front and rear sliding uprights to automatically slide to predetermined positions when the trolley is unfolded, forming a stable mechanical support system. The hinged connection between the sliding and central uprights enhances the three-dimensional support strength of the frame and effectively disperses load stress. Furthermore, the sliding installation method enables the support rod assembly to retract in tandem during folding, avoiding the multi-node operational complexity of traditional fixed triangular support structures. This significantly simplifies the folding and unfolding process while maintaining high load-bearing capacity, achieving a dual improvement in structural strength and ease of operation. It eliminates the risk of support rod breakage and optimizes the user experience.

[0033] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the front upper kit 13, the rear upper kit 14, the front lower kit 23 and the rear lower kit 24 are provided with mounting ports 4 for inserting one end of the front upper rod 11, the rear upper rod 12, the front lower rod 21 and the rear lower rod 22 respectively.

[0034] In this embodiment, the front upper rod, rear upper rod, front lower rod, and rear lower rod can be directly inserted and fixed. This modular design not only simplifies the assembly process and reduces production costs, but also enhances the connection strength between the components, avoiding the loosening or breakage problems that may occur with traditional welding or bolt fixing methods. Its working principle is to form a stable frame structure through the tight insertion and cooperation of the kit and the rod. At the same time, the size and shape of the installation port can be adjusted according to different needs.

[0035] Furthermore, as a preferred embodiment of this solution and not a limitation, the upper connecting rod 15 is provided with upper hinge portions 151 at both ends, the front upper assembly 13 and the rear upper assembly 14 are provided with upper connecting portions 131 and 141 corresponding to the left and right sides of the upper hinge portions 151, the lower connecting rod 25 is provided with lower hinge portions 251 at both ends, the front lower assembly 23 and the rear lower assembly 24 are provided with lower connecting portions 231 and 241 corresponding to the left and right sides of the lower hinge portions 251; or the front upper assembly 13 and the rear upper assembly 14 are provided with upper hinge portions 151 at both ends, the upper connecting rod 15 is provided with upper connecting portions 131 and 141 corresponding to the left and right sides of the upper hinge portions 151, the front lower assembly 23 and the rear lower assembly 24 are provided with lower hinge portions 251 at both ends, and the lower connecting rod 25 is provided with lower connecting portions 231 and 241 corresponding to the left and right sides of the lower hinge portions 251.

[0036] In this embodiment, a bidirectional symmetrical hinge structure for the trolley frame is implemented, making folding and unfolding actions smoother and more stable, avoiding frame deformation caused by unilateral force. At the same time, the symmetrical distribution of hinge points on the left and right sides effectively disperses the load-bearing pressure, greatly improving the stability and durability of the overall structure. The external hinges on both sides avoid the risk of users pinching their hands when lifting the upper connecting rod to fold, further enhancing the safety and terrain adaptability of the trolley.

[0037] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a folding and unlocking mechanism, which includes a front locking component 51 for restricting the front sliding upright 32 from sliding along the length direction of the front lower rod 21, and a rear locking component 52 for restricting the rear sliding upright 33 from sliding along the length direction of the rear lower rod 22.

[0038] In this embodiment, the stability and safety of the folding stroller are significantly improved by introducing a folding and unlocking mechanism. In the unfolded state, the front locking assembly 51 and the rear locking assembly 52 ensure that the sliding upright will not slide accidentally due to external forces, thereby maintaining the stability of the stroller structure and effectively preventing frame deformation or tipping caused by the movement of the support rod. Especially when carrying heavy objects or children, the locking assembly fixes the sliding end of the sliding upright in a specific position through mechanical limiting. The lock is released manually or automatically only when the stroller needs to be folded, allowing the sliding upright to move to achieve folding.

[0039] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the front locking assembly 51 includes a first limiting member 511 disposed on the front lower rod 21 and used to restrict the sliding end of the front sliding upright 32 from sliding in a direction away from the lower connecting rod 25, and a first locking member 512 disposed on the sliding end of the front sliding upright 32 and used to restrict the sliding end of the front sliding upright 32 from sliding in a direction close to the lower connecting rod 25.

[0040] In this embodiment, bidirectional restriction on the sliding of the front sliding upright 32 on the front lower rod 21 is achieved, significantly enhancing the stability and safety of the folding stroller in its unfolded state. The first limiting member 511 is fixed to the front lower rod 21, preventing the sliding end of the front sliding upright 32 from moving away from the lower connecting rod 25, thereby avoiding frame tipping or deformation due to insufficient support. The first locking member 512 is located on the sliding end of the front sliding upright 32, preventing it from sliding closer to the lower connecting rod 25, ensuring the stability of the support structure when the stroller is carrying heavy objects or children. Through mechanical limiting or snap-fit ​​structures, the position of the front sliding upright 32 is fixed in two directions. Only when the stroller needs to be folded can the locking in both directions be released simultaneously through manual operation or a specific release mechanism, allowing the front sliding upright 32 to move freely to achieve folding.

[0041] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the rear locking assembly 52 includes a second limiting member 521 disposed on the rear lower rod 22 and used to limit the sliding end of the rear sliding upright 33 from sliding in a direction away from the lower connecting rod 25.

[0042] Furthermore, as a preferred embodiment of this solution and not a limitation, the first locking member 512 is provided with a first limiting hole 5121, and the front lower rod 21 is provided with a first limiting member 511 corresponding to the first limiting hole 5121. The first limiting member 511 extends into the first limiting hole 5121 to restrict the sliding end of the front sliding upright 32 from sliding in the direction close to the lower connecting rod 25. The first limiting member 511 disengages from the first limiting hole 5121 to release the restriction on the sliding end of the front sliding upright 32 from sliding in the direction close to the lower connecting rod 25.

[0043] In this embodiment, precise locking and unlocking control of the sliding end of the front sliding upright 32 is achieved, significantly improving the stability and ease of operation of the folding stroller. When the first limiting member 511 extends into the first limiting hole 5121, the sliding end of the front sliding upright 32 is firmly locked and cannot move towards the lower connecting rod 25, thereby ensuring the stability of the support structure of the stroller in the unfolded state and effectively preventing frame deformation or tipping due to accidental sliding of the support rod. Especially when carrying heavy objects or children, the mechanical limiting principle is used to achieve precise fixation of the position of the front sliding upright 32 through the tight cooperation between the first limiting member 511 and the first limiting hole 5121. When the stroller needs to be folded, the first limiting member 511 is disengaged from the first limiting hole 5121 by manual operation, the lock is released, and the front sliding upright 32 is allowed to move freely to achieve folding. The first locking member is made of soft silicone material, which allows the first limiting member to disengage from the first limiting hole through deformation.

[0044] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, it also includes a wheel assembly, which includes a front wheel frame 61, a rear wheel frame 62, and wheels 63 disposed on the front wheel frame 61 and the rear wheel frame 62. The end of the front upper rod 11 away from the intermediate upright rod 31 and the end of the front lower rod 21 away from the intermediate upright rod 31 are respectively hinged to the front wheel frame 61, and the end of the rear upper rod 12 away from the intermediate upright rod 31 and the end of the rear lower rod 22 away from the intermediate upright rod 31 are respectively hinged to the rear wheel frame 62.

[0045] In this embodiment, the components of the trolley form a stable quadrilateral support structure when unfolded, which greatly improves the overall rigidity and load-bearing capacity. At the same time, the hinged connection ensures that the wheel set can be folded synchronously with the frame when folded, significantly reducing the storage volume. Its working principle is to use the multi-point hinge of the wheel frame and the rod to form a dynamic balance system. When pushed, it can automatically adapt to the undulation of the road surface and maintain stability through the synchronous grounding of the four wheels. When folded, the hinge points rotate in coordination to achieve compact storage.

[0046] Furthermore, as a preferred embodiment of this solution and not a limitation, it also includes a wheel assembly, wherein the front wheel frame 61 includes a front lower mounting portion 611, a front upper mounting portion 612, and a front wheel frame vertical rod 613 connecting the front lower mounting portion 611 and the front upper mounting portion 612, and the rear wheel frame 62 includes a rear lower mounting portion 621, a rear upper mounting portion 622, and a rear wheel frame vertical rod 623 connecting the rear lower mounting portion 621 and the rear upper mounting portion 622.

[0047] In this embodiment, the wheel frame disperses stress under vertical loads through the support of the vertical rods, preventing deformation and fracture caused by localized overload. Simultaneously, the layered arrangement of the upper and lower mounting sections provides the trolley with more functional expansion interfaces. Its working principle involves connecting the upper and lower mounting sections through the column structure of the front and rear wheel frame vertical rods, forming a stable spatial force-bearing system. During pushing, vertical forces are directly transmitted through the vertical rods, while lateral forces are shared by the upper and lower mounting sections, significantly improving the wheel frame's torsional and impact resistance.

[0048] The working principle of this embodiment is as follows:

[0049] This application discloses a folding trolley that utilizes a support rod assembly between the upper and lower folding frames. The central upright serves as the core support, and the front and rear sliding uprights, when unfolded, slide and lock along the lower front and rear rods to form a dynamic triangular support structure. This allows the sliding ends of the front and rear sliding uprights to automatically slide to predetermined positions when the trolley is unfolded, forming a stable mechanical support system. The hinged connection between the sliding and central uprights enhances the three-dimensional support strength of the frame and effectively disperses load stress. Furthermore, the sliding installation method enables the support rod assembly to retract in tandem during folding, avoiding the multi-node operational complexity of traditional fixed triangular support structures. This significantly simplifies the folding and unfolding process while maintaining high load-bearing capacity, achieving a dual improvement in structural strength and ease of operation. It eliminates the risk of support rod breakage and optimizes the user experience.

[0050] The above are implementation methods provided in conjunction with specific content, and it is not intended that the specific implementation of this application is limited to these descriptions. Any methods or structures that are similar to those of this application, or any technical deductions or substitutions made based on the concept of this application, should be considered within the scope of protection of this application.

Claims

1. A folding stroller, characterized in that, Includes a foldable frame, the foldable frame comprising: The upper folding frame (1) includes a front upper rod (11), a rear upper rod (12), a front upper kit (13) connected to the front upper rod (11), a rear upper kit (14) connected to the rear upper rod (12), and an upper connecting rod (15) hinged to the front upper kit (13) and the rear upper kit (14) respectively. The lower folding frame (2) includes a front lower rod (21), a rear lower rod (22), a front lower assembly (23) connected to the front lower rod (21), a rear lower assembly (24) connected to the rear lower rod (22), and a lower connecting rod (25) hinged to the front lower assembly (23) and the rear lower assembly (24) respectively. The support rod assembly (3) includes an intermediate upright (31) disposed between the upper folding frame (1) and the lower folding frame (2), and a front sliding upright (32) and a rear sliding upright (33) respectively disposed on both sides of the intermediate upright (31). One end of the front sliding upright (32) is hinged to the intermediate upright (31), and the other end is slidably mounted on the front lower rod (21) along the length direction of the front lower rod (21). One end of the rear sliding upright (33) is hinged to the intermediate upright (31), and the other end is slidably mounted on the rear lower rod (22) along the length direction of the rear lower rod (22).

2. A folding stroller according to claim 1, wherein, The front upper kit (13), the rear upper kit (14), the front lower kit (23), and the rear lower kit (24) are provided with mounting ports (4) for inserting one end of the front upper rod (11), the rear upper rod (12), the front lower rod (21), and the rear lower rod (22), respectively.

3. A folding stroller according to claim 1, wherein, The upper connecting rod (15) has upper hinge parts (151) at both ends. The front upper kit (13) and the rear upper kit (14) have upper connecting parts (131, 141) that are hinged to the left and right sides of the upper hinge parts (151). The lower connecting rod (25) has lower hinge parts (251) at both ends. The front lower kit (23) and the rear lower kit (24) have lower connecting parts (231, 241) that are hinged to the left and right sides of the lower hinge parts (251).

4. The folding stroller of claim 1, wherein, It also includes a folding and unlocking mechanism, which includes a front locking component (51) for limiting the sliding of the front sliding upright (32) along the length direction of the front lower rod (21), and a rear locking component (52) for limiting the sliding of the rear sliding upright (33) along the length direction of the rear lower rod (22).

5. A folding stroller according to claim 4, wherein, The front locking assembly (51) includes a first limiting member (511) disposed on the front lower rod (21) and used to limit the sliding end of the front sliding upright (32) from sliding in a direction away from the lower connecting rod (25), and a first locking member (512) disposed on the sliding end of the front sliding upright (32) and used to limit the sliding end of the front sliding upright (32) from sliding in a direction close to the lower connecting rod (25).

6. A folding stroller according to claim 5, wherein, The rear locking assembly (52) includes a second limiting member (521) disposed on the rear lower rod (22) and used to limit the sliding end of the rear sliding upright (33) from sliding in a direction away from the lower connecting rod (25).

7. A folding stroller according to claim 6, wherein, The first locking member (512) is provided with a first limiting hole (5121), and the front lower rod (21) is provided with a first limiting member (511) corresponding to the first limiting hole (5121). The first limiting member (511) extends into the first limiting hole (5121) to restrict the sliding end of the front sliding upright (32) from sliding in the direction close to the lower connecting rod (25). The first limiting member (511) disengages from the first limiting hole (5121) to release the restriction on the sliding end of the front sliding upright (32) from sliding in the direction close to the lower connecting rod (25).

8. The foldable stroller of claim 1, wherein, It also includes a wheel assembly, which includes a front wheel frame (61), a rear wheel frame (62), and wheels (63) mounted on the front wheel frame (61) and the rear wheel frame (62). The front upper rod (11) is hinged to the front wheel frame (61) at one end away from the middle upright rod (31), and the front lower rod (21) is hinged to the rear wheel frame (62) at one end away from the middle upright rod (31).

9. A folding stroller according to claim 8, wherein, It also includes wheel assemblies, the front wheel frame (61) including a front lower mounting part (611), a front upper mounting part (612), and a front wheel frame vertical bar (613) connecting the front lower mounting part (611) and the front upper mounting part (612), and the rear wheel frame (62) including a rear lower mounting part (621), a rear upper mounting part (622), and a rear wheel frame vertical bar (623) connecting the rear lower mounting part (621) and the rear upper mounting part (622).

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