A foldable trolley

Abstract

A foldable handcart includes an outer frame and an inner frame, which are hinged together by a hinge assembly. When the handcart is folded, the outer and inner frames rotate outwards to fold; when the handcart is unfolded, the outer and inner frames rotate inwards to unfold. The outer frame includes an upper frame and a lower frame, which are hinged together by the hinge assembly. The upper and lower frames are rotatably connected by a joint assembly. When the handcart is folded, the upper and lower frames rotate towards each other; when the handcart is unfolded, the upper and lower frames rotate outwards to unfold. This handcart, by using an outer frame and an inner frame, and by folding the outer and inner frames outwards to fold and unfolding the handcart inwards to unfold, differs from traditional inward-folding frames. This allows the handcart to remain supported on a support by its wheels even after folding, making storage more convenient.

Description

Technical Field

[0001] This utility model relates to the field of handcart technology, and in particular to a foldable handcart. Background Technology

[0002] Chinese Patent Document No. CN209972545U, published on January 21, 2020, discloses a folding stroller, including a support base and a frame having an unfolded position and a folded position. The frame includes a handle tube, a push tube, a front leg tube, and a rear leg tube. The frame also has a joint assembly, a front wheel connected to the lower end of the front leg tube, and a rear wheel connected to the lower end of the rear leg tube. The joint assembly is connected to the front leg tube, the rear leg tube, and the push tube. The support base is disposed on the frame. A rotating assembly is provided at the connection between the handle tube and the push tube. The rotating assembly includes a rotating seat and a seat cover that cooperates with the rotating seat. The rotating seat and the seat cover are fixedly connected by a screw and can rotate around the screw. The rotating seat is provided with at least two latches, and the rotating assembly also includes a locking tongue that cooperates with the latches. The locking tongue is embedded in the latches so that the stroller can be locked in multiple positions. When the folding stroller is folded, the frame folds inward. After folding, the stroller cannot be supported on a support by the wheels, making it inconvenient to store.

[0003] Therefore, further improvements are necessary. Utility Model Content

[0004] The purpose of this invention is to provide a foldable handcart that is simple in structure, easy to fold and store, has a good user experience, and is highly practical, so as to overcome the shortcomings of the prior art.

[0005] A foldable handcart designed for this purpose is characterized by comprising an outer frame and an inner frame, which are hinged to each other by a hinge assembly; when the handcart is folded, the outer frame and the inner frame rotate outwards to fold; when the handcart is unfolded, the outer frame and the inner frame rotate inwards to unfold.

[0006] The outer frame includes an upper frame and a lower frame. The upper frame and the inner frame are hinged to each other by a hinge assembly. The upper frame and the lower frame are rotatably connected by a joint assembly. When the trolley is folded, the upper frame and the lower frame rotate to close together. When the trolley is unfolded, the upper frame and the lower frame rotate to open.

[0007] The upper frame includes two left and right pipe components and a first horizontal pipe, and the two left and right pipe components are connected by the first horizontal pipe.

[0008] The inner frame includes two left and right first folding tubes and a second horizontal tube, with the two left and right first folding tubes connected by the second horizontal tube.

[0009] The pipe assembly includes a connecting pipe and a support pipe arranged sequentially, one above the other. The hinge assembly includes a first hinge block and a second hinge block that are hinged to each other. The first hinge block is hinged to the support pipe, and the second hinge block is hinged to the connecting pipe and the first folding pipe respectively. When the trolley is folded, the connecting pipe and the support pipe rotate and move closer to each other. When the trolley is unfolded, the connecting pipe and the support pipe rotate and open.

[0010] The lower frame includes two second folded tubes arranged on the left and right, and a connecting rod. The two second folded tubes arranged on the left and right are connected by the connecting rod.

[0011] The joint assembly is provided with a first connecting end and a second connecting end. The first connecting end is connected to the support tube, and the second connecting end is connected to the second folding tube. The support tube and the second folding tube are rotatably connected through the joint assembly.

[0012] When the trolley is folded, the first and second folding tubes rotate outward relative to each other to fold; when the trolley is unfolded, the first and second folding tubes rotate inward relative to each other to unfold.

[0013] It also includes a front wheel assembly and a rear wheel assembly, with the front wheel assembly mounted at the bottom of the inner frame and the rear wheel assembly mounted at the bottom of the outer frame.

[0014] It also includes connectors set on the left and right sides. The other end of the first folding tube is inserted into the connector, and the two ends of the second horizontal tube are respectively inserted into the corresponding connectors. The connectors are connected to the corresponding front wheel sets; the two ends of the connecting rod are respectively connected to the corresponding rear wheel sets.

[0015] The upper part of the outer frame is equipped with a support seat, and the two sides of the support seat are connected to the corresponding tube components.

[0016] This utility model of a handcart features an outer frame and an inner frame. When the handcart is folded, the outer and inner frames rotate outwards to fold; when the handcart is unfolded, the outer and inner frames rotate inwards to unfold. Unlike traditional inward-folding frames, this design allows the handcart to remain supported on a support (such as the ground) even after folding, making storage more convenient. Furthermore, the handcart is very small when folded, making it suitable for narrow storage spaces. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the handcart in one embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the overall structure of the handcart from another position in one embodiment of the present invention.

[0019] Figure 3 This is an exploded view of the handcart in one embodiment of the present invention.

[0020] Figure 4This is a side view of the handcart unfolded in one embodiment of the present invention.

[0021] Figure 5 This is a simplified side view of the handcart folded in one embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the assembly structure of the upper frame and the hinge assembly in one embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the overall structure of the upper frame in one embodiment of the present invention.

[0024] Figure 8 This is a schematic diagram of the overall structure of the lower frame in one embodiment of the present invention.

[0025] Figure 9 This is a schematic diagram of the overall structure of the inner frame in one embodiment of the present invention.

[0026] Figure 10 This is a schematic diagram of the overall structure of the joint assembly in one embodiment of the present invention. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] See Figures 1-10 This foldable trolley includes an outer frame 1 and an inner frame 2, which are hinged together by a hinge assembly a; as Figure 5 As shown, when the trolley is folded, the outer frame 1 and the inner frame 2 rotate outwards and fold. After folding, the front wheel assembly 18 and the rear wheel assembly 19 move away from each other. The front wheel assembly 18, the rear wheel assembly 19, the outer frame 1, and the inner frame 2 form a stable triangular support, allowing the trolley to still be supported on a support (such as the ground) by its wheels; Figure 4 As shown, when the trolley is unfolded, the outer frame 1 and the inner frame 2 rotate inwards to unfold.

[0029] The outer frame 1 includes an upper frame 3 and a lower frame 4. The upper frame 3 and the inner frame 2 are hinged to each other by a hinge assembly a. The upper frame 3 and the lower frame 4 are rotatably connected by a joint assembly 5. When the trolley is folded, the upper frame 3 and the lower frame 4 rotate and move closer to each other, thereby reducing the space occupied. When the trolley is unfolded, the upper frame 3 and the lower frame 4 rotate and open.

[0030] The upper frame 3 includes two left and right pipe assemblies 6 and a first horizontal pipe 7, and the two left and right pipe assemblies 6 are connected by the first horizontal pipe 7.

[0031] The inner frame 2 includes two left and right first folding tubes 8 and a second horizontal tube 9, and the two left and right first folding tubes 8 are connected by the second horizontal tube 9.

[0032] Pipe assembly 6 includes a connecting pipe 10 and a support pipe 11 arranged sequentially vertically. Hinged assembly a includes a first hinge block 12 and a second hinge block 13 hinged to each other. One end of the first hinge block 12 is hinged to one end of the second hinge block 13, and the other end of the first hinge block 12 is hinged to one end of the support pipe 11. The other end of the second hinge block 13 is hinged to one end of the first folded pipe 8, and the middle of the second hinge block 13 is hinged to one end of the connecting pipe 10. Each component is connected by a hinge shaft and a hinge... The connecting holes are hinged to each other; the hinged structure allows the outer frame 1 and inner frame 2 to rotate outwards and fold when the trolley is folded, and to rotate inwards and unfold when the trolley is unfolded; when the trolley is folded, the connecting tube 10 and the support tube 11 rotate and move closer to each other, at which time there is an angle between the connecting tube 10 and the support tube 11; when the trolley is unfolded, the connecting tube 10 and the support tube 11 rotate and open, at which time the connecting tube 10 and the support tube 11 form a straight line.

[0033] The two ends of the first horizontal tube 7 are respectively inserted into the other end of the connecting tube 10 so that the two left and right tube assemblies 6 are connected through the first horizontal tube 7.

[0034] The lower frame 4 includes two left and right second folded tubes 14 and a connecting rod 15. The two left and right second folded tubes 14 are connected by the connecting rod 15, and the two ends of the connecting rod 15 are respectively inserted into the second folded tubes 14.

[0035] The joint assembly 5 is provided with a first connecting end 16 and a second connecting end 17. The first connecting end 16 is connected to the other end of the support tube 11, and the second connecting end 17 is connected to the second folding tube 14. The support tube 11 and the second folding tube 14 are rotatably connected through the joint assembly 5. For the specific structure of the joint assembly 5, please refer to patent CN209972545U.

[0036] When the trolley is folded, the first folding tube 8 and the second folding tube 14 rotate outward relative to each other and fold, thereby causing the outer frame 1 and the inner frame 2 to rotate outward relative to each other and fold; when the trolley is unfolded, the first folding tube 8 and the second folding tube 14 rotate inward relative to each other and unfold, thereby causing the outer frame 1 and the inner frame 2 to rotate inward relative to each other and unfold. Figure 5 The trolley is in an incompletely folded state, meaning that the trolley can continue to be folded in this state until the angle between the first folding tube 8 and the second folding tube 14 is very small and they are almost in a straight line.

[0037] It also includes a front wheel assembly 18 and a rear wheel assembly 19, with the front wheel assembly 18 mounted on the bottom of the inner frame 2 and the rear wheel assembly 19 mounted on the bottom of the outer frame 1.

[0038] It also includes connectors 21 set on the left and right, the other end of the first folding tube 8 is inserted into the connector 21, the two ends of the second horizontal tube 9 are respectively inserted into the corresponding connectors 21, the connectors 21 are connected to the corresponding front wheel assembly 18; the two ends of the connecting rod 15 are respectively connected to the corresponding rear wheel assembly 19.

[0039] The upper part of the outer frame 1 is provided with a bearing seat 20, and the two sides of the bearing seat 20 are respectively connected to the corresponding tube assembly 6; the inner side of the support tube 11 is provided with a plug block 22, and the two sides of the bearing seat 20 are respectively provided with a rotating seat 23. The rotating seat 23 and the plug block 22 are plugged into each other, and the bearing seat 20 is flipped up and down on the outer frame 1 through the rotating seat 23.

[0040] A locking device 24 is provided between the connecting pipe 10 and the support pipe 11. The locking device 24 locks the support pipe 11 (the support pipe 11 cannot rotate when locked), so that the handcart is stable in the unfolded state. The locking device 24 can also unlock the support pipe 11, so that the support pipe 11 can rotate. For the specific structure of the locking device 24, please refer to patent CN209366240U.

[0041] The above describes the preferred embodiments of this utility model, illustrating and describing its basic principles, main features, and advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A foldable stroller, characterized by: It includes an outer frame (1) and an inner frame (2), which are hinged to each other by a hinge assembly (a); when the trolley is folded, the outer frame (1) and the inner frame (2) rotate outwards to fold; when the trolley is unfolded, the outer frame (1) and the inner frame (2) rotate inwards to unfold. The outer frame (1) includes an upper frame (3) and a lower frame (4). The upper frame (3) and the inner frame (2) are hinged to each other by a hinge assembly (a). The upper frame (3) and the lower frame (4) are rotatably connected by a joint assembly (5). When the trolley is folded, the upper frame (3) and the lower frame (4) rotate toward each other and move closer together. When the trolley is unfolded, the upper frame (3) and the lower frame (4) rotate toward each other and open up.

2. The foldable stroller of claim 1, wherein: The upper frame (3) includes two left and right pipe assemblies (6) and a first horizontal pipe (7), the two left and right pipe assemblies (6) being connected by the first horizontal pipe (7).

3. The foldable stroller of claim 2, wherein: The inner frame (2) includes two left and right first folding tubes (8) and a second horizontal tube (9), and the two left and right first folding tubes (8) are connected by the second horizontal tube (9).

4. The foldable stroller of claim 3, wherein: The tube assembly (6) includes a connecting tube (10) and a support tube (11) arranged sequentially. The hinge assembly (a) includes a first hinge block (12) and a second hinge block (13) that are hinged to each other. The first hinge block (12) is hinged to the support tube (11), and the second hinge block (13) is hinged to the connecting tube (10) and the first folding tube (8) respectively. When the trolley is folded, the connecting tube (10) and the support tube (11) rotate and move closer to each other. When the trolley is unfolded, the connecting tube (10) and the support tube (11) rotate and open.

5. The foldable stroller of claim 4, wherein: The lower frame (4) includes two left and right second folding tubes (14) and a connecting rod (15), and the two left and right second folding tubes (14) are connected by the connecting rod (15).

6. The foldable stroller of claim 5, wherein: The joint assembly (5) is provided with a first connecting end (16) and a second connecting end (17). The first connecting end (16) is connected to the support tube (11), and the second connecting end (17) is connected to the second folding tube (14). The support tube (11) and the second folding tube (14) are rotatably connected through the joint assembly (5).

7. The foldable stroller of claim 6, wherein: When the trolley is folded, the first folding tube (8) and the second folding tube (14) rotate outward relative to each other and fold; when the trolley is unfolded, the first folding tube (8) and the second folding tube (14) rotate inward relative to each other and unfold.

8. The foldable stroller of claim 1, wherein: It also includes a front wheel assembly (18) and a rear wheel assembly (19), with the front wheel assembly (18) mounted on the bottom of the inner frame (2) and the rear wheel assembly (19) mounted on the bottom of the outer frame (1).

9. The foldable stroller of claim 8, wherein: It also includes connectors (21) set on the left and right, the other end of the first folding tube (8) is inserted into the connector (21), the two ends of the second horizontal tube (9) are respectively inserted into the corresponding connectors (21), the connectors (21) are connected to the corresponding front wheel group (18); the two ends of the connecting rod (15) are respectively connected to the corresponding rear wheel group (19).

10. The foldable stroller of claim 2, wherein: The upper part of the outer frame (1) is provided with a support seat (20), and the two sides of the support seat (20) are respectively connected to the corresponding tube assembly (6).

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