Carrying device

Abstract

The utility model provides a carrying device which comprises a frame with wheels at the bottom and an expansion piece hinged to the frame, the expansion piece can turn over along a horizontal axis and has an unfolding state which is arranged outside the frame and is approximately horizontal and a storage state which is integrally close to the frame, the expansion piece and the frame are hinged at a first hinge point, and the expansion piece and the frame are hinged at a second hinge point. A first connecting rod and a second connecting rod are arranged between the expansion piece and the frame, the first connecting rod and the frame are hinged to a second hinge point, the second connecting rod and the expansion piece are hinged to a third hinge point, and the first connecting rod and the second connecting rod are hinged to a fourth hinge point. The second hinge point, the third hinge point and the fourth hinge point are located on the same straight line, and when the expansion piece is in the storage state, the fourth hinge point crosses the connecting line of the first hinge point and the third hinge point, so that the expansion piece is kept in the storage state. Locking and unlocking operations are omitted, and the operation is more convenient.

Description

Technical Field

[0001] This application relates to a children's product, and more particularly to a transport device. Background Technology

[0002] Existing trolleys, such as the patent document with publication number CN219565133U, disclose a passenger-carrying structure for a folding outdoor trailer, including a housing and a passenger-carrying mechanism (i.e., a pedal) hinged to one side of the housing. The housing is provided with a locking component, and a locking hole is provided on the corresponding pedal. When the pedal is flipped upward and in a vertical state, the locking component can be inserted into the locking hole to keep it in a vertical state.

[0003] In actual use, for example, when storing the pedal, the locking mechanism needs to be manually operated to lock it in place to prevent the pedal from flipping downwards. When using it, the locking mechanism needs to be manually unlocked to allow the pedal to flip downwards and unfold. Utility Model Content

[0004] This application provides a transport device that is easy to use.

[0005] This application provides a transport device, including a frame with wheels at the bottom and an extension member hinged to the frame. The extension member can be flipped along a horizontal axis, having an extended state that is positioned outside the frame and is generally horizontal, and a retracted state that is generally close to the frame. The extension member is hinged to the frame at a first hinge point, and a first link and a second link are provided between the extension member and the frame. The first link is hinged to the frame at a second hinge point, the second link is hinged to the extension member at a third hinge point, and the first link and the second link are hinged at a fourth hinge point. From a side view, in the extended state, the second hinge point, the third hinge point, and the fourth hinge point are on the same straight line. In the retracted state, the fourth hinge point crosses the line connecting the first hinge point and the third hinge point, so that the extension member remains in the retracted state.

[0006] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0007] Optionally, the frame includes a front frame and a rear frame arranged opposite to each other, with a front wheel at the bottom of the front frame and a rear wheel at the bottom of the rear frame, and the extension is hinged to the rear frame.

[0008] Optionally, the front frame and the rear frame are installed upright.

[0009] Optionally, two side frames are provided between the front frame and the rear frame. The front frame, the rear frame, and the two side frames together form an accommodating space. The two side frames are foldable, and when folded, the front frame and the rear frame are close to each other.

[0010] Optionally, the rear frame includes a horizontally arranged upper crossbar and a lower crossbar. The lower crossbar is provided with a connecting seat that is hinged to the extension member. In the unfolded state, the lower crossbar restricts the extension member from flipping downwards, and in the stowed state, the upper crossbar restricts the extension member from flipping forwards.

[0011] Optionally, the first link and the second link are arranged in pairs and disposed on both sides of the extension.

[0012] Optionally, the extension is arranged vertically or tilted forward in the stowed state.

[0013] Optionally, the line connecting the first hinge point and the fourth hinge point is the first connecting line, the line connecting the second hinge point and the fourth hinge point is the second connecting line, and the line connecting the third hinge point and the fourth hinge point is the third connecting line. The second connecting line and the third connecting line are shorter than the first connecting line.

[0014] Optionally, the extension is a standing board for children to stand on.

[0015] Optionally, the carrying device includes a safety guard to prevent the extension from flipping from the stowed state to the unfolded state.

[0016] Optionally, the safety protection component is a flexible webbing, which has a two-section structure. One end of each section is fixedly connected to the frame, and the other end is provided with a connector. The two sections can be connected or separated through the connector.

[0017] In the carrying device of this application, when the extension component switches from the unfolded state to the retracted state, the fourth hinge point crosses the line connecting the first hinge point and the third hinge point. That is, by crossing the dead point, the first link and the second link are prevented from rotating to unfold, thereby keeping the extension component in the retracted state. This eliminates the need for locking and unlocking operations and makes operation more convenient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the extended member in the deployed state of a transport device according to an embodiment of this application;

[0019] Figure 2 for Figure 1 Front view of the medium-sized transport device;

[0020] Figure 3 for Figure 2 Partial structural view in the AA direction;

[0021] Figure 4 for Figure 1 Partial structural view of the middle extension component during rotation;

[0022] Figure 5 for Figure 3 Partial structural view of the middle extension component during rotation;

[0023] Figure 6 for Figure 1 A partial structural view of the extension component in its stowed state;

[0024] Figure 7 for Figure 3 A partial structural view of the extension component in its stowed state;

[0025] Figures 8-10 This is a schematic diagram showing the changes in the connecting lines during the unfolding process of the extension component.

[0026] The attached diagram is described below:

[0027] 1000. Transport device; 100. Frame; 110. Front frame; 120. Rear frame; 121. Upper crossbar; 122. Lower crossbar; 123. Connecting seat; 124. Column; 130. Push handle assembly; 140. Side frame;

[0028] 200. Extension component; 210. Flat plate; 220. Reinforcing component;

[0029] 310, First hinge point; 320, Second hinge point; 330, Third hinge point; 340, Fourth hinge point; 410, First link; 420, Second link; 510, First connecting line; 520, Second connecting line; 530, Third connecting line; 600, Safety guard. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] In this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number or order of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] See Figures 1 to 10 One embodiment of this application provides a transport device 1000, including a frame 100 with wheels at the bottom and an extension member 200 hinged to the frame 100. The extension member 200 can be flipped about a horizontal axis and has an unfolded state that is placed outside the frame 100 and is generally horizontal, and a retracted state that is close to the frame 100. The extension member 200 can be a standing platform as shown in the accompanying drawings, and is horizontally arranged in the unfolded state. Alternatively, the extension member 200 can be a frame structure, which, when fitted with a flexible fabric cover, can be used as a storage basket; correspondingly, in the unfolded state, the frame structure is horizontally arranged.

[0035] The extension member 200 is hinged to the frame 100 at a first hinge point 310, and a first connecting rod 410 and a second connecting rod 420 are provided between the extension member 200 and the frame 100. The first connecting rod 410 is hinged to the frame 100 at the second hinge point 320, the second connecting rod 420 is hinged to the extension member 200 at a third hinge point 330, and the first connecting rod 410 and the second connecting rod 420 are hinged to a fourth hinge point. See appendix. Figure 3 , Figure 5 , Figure 7 and Figures 8-10 From a side view, in the unfolded state, the second hinge point 320, the third hinge point 330, and the fourth hinge point 340 of the extension member 200 are on the same straight line. In the retracted state, the fourth hinge point 340 crosses the line connecting the first hinge point 310 and the third hinge point 330 (i.e., the first connecting line 510 described below). During the unfolding process, the fourth hinge point 340 and the first connecting line 510 coincide at a dead point. Since an additional external force is required for the fourth hinge point 340 to cross this dead point during the unfolding process, the extension member 200 can remain in the retracted state without external force.

[0036] Compared to existing technologies, the carrying device of this application eliminates the locking operation during storage and the unlocking operation during deployment, making it more convenient to operate. Specifically, the line connecting the second hinge point 320 and the fourth hinge point 340 is the second connecting line 520, and the line connecting the third hinge point 330 and the fourth hinge point 340 is the third connecting line 530. The second connecting line 520 and the third connecting line 530 are shorter than the first connecting line 510. Wherein, as... Figure 8 As shown, in the folded state, the angle α between the third connecting line 530 and the first connecting line 510 is 0.5–5°, preferably 1°, allowing for easy application of force to unfold the extension member 200. For ease of understanding, in… Figure 3 , Figure 5 and Figure 7 In the diagram, each connecting line is indicated by a bold solid line. For clarity, the changing states of each connecting line are shown separately as an attached diagram.

[0037] The frame 100 includes a front frame 110 and a rear frame 120 arranged opposite to each other. The front frame 110 has a front wheel at its bottom, and the rear frame 120 has a rear wheel at its bottom. The extension member 200 is hinged to the rear frame 120, and a push handle assembly 130 is provided on the rear side of the frame 100. The front frame 110 and the rear frame 120 can be tilted, for example, the front frame 110 can be tilted to the rear, and the rear frame 120 can be tilted to the front.

[0038] For example, the front frame 110 and the rear frame 120 are erected vertically, and two side frames 140 are provided between the front frame 110 and the rear frame 120. The front frame 110, the rear frame 120 and the two side frames 140 together form a storage space for accommodating items or carrying children. The two side frames 140 are foldable, and when folded, the front frame 110 and the rear frame 120 are close to each other.

[0039] Regardless of the arrangement of the front frame 110 and the rear frame 120, the extension component 200, in its retracted state, is in a vertical position, or slightly tilted forward relative to vertical, with the front side being the side where the front frame 110 is located and the rear frame 120 being the side where the rear frame is located. In the illustration, the extension component 200 is tilted forward relative to vertical at an angle of 1°. Because the extension component 200 is tilted forward, due to gravity, it always has a tendency to flip forward, preventing the extension component 200 from flipping backward and unfolding due to vibrations during the movement of the transport device.

[0040] To prevent the transport device 1000 from unexpectedly unfolding during movement, the transport device 1000 includes a safety guard 600 that prevents the extension member 200 from flipping from its retracted state to its unfolded state. The safety guard 600 is a flexible webbing. The rear frame 120 includes two opposing columns 124, an upper crossbar 121 and a lower crossbar 122 horizontally arranged between the two columns 124, and the lower crossbar 122 is provided with a connecting seat 123 that is hinged to the extension member 200. The extension member 200 includes a flat plate 210 hinged to the connecting seat 123, and a reinforcing member 220 fixedly disposed on the back of the flat plate 210. The reinforcing member 220 is used to improve the load-bearing capacity of the pedal and is a metal frame structure. When the extension 200 is in the unfolded state, the lower crossbar 122 abuts against the extension 200 to prevent the extension 200 from flipping downwards. At the same time, when the extension 200 is carrying items or children, the load-bearing force is transmitted to the frame 100 itself through the first link 410, the second link 420 and the lower crossbar 122.

[0041] In its retracted state, the extension member 200 is restrained from further folding forward by abutting against the upper crossbar 121. In this retracted state, the extension member 200, the first connecting rod 410, and the second connecting rod 420 are located within the area defined by the two uprights 124, i.e., they do not extend beyond the frame 100. Preferably, the two-section rods formed by the first connecting rod 410 and the second connecting rod 420 are arranged in two sets on both sides of the extension member 200 in the width direction.

[0042] like Figure 6 As shown, the flexible webbing has a two-section structure as indicated by the dotted lines. One end of each section is connected to one of the two uprights 124, and the other end is connected to each other via a connector. The connector allows the two sections of flexible webbing to be connected or separated. Connectors can be, for example, Velcro or snap fasteners. In the stowed state, when the two sections of flexible webbing are connected, they are positioned on either side of the upper crossbar 121, acting to restrict or reduce the swaying of the extension 200. When the two sections of flexible webbing are separated, the extension 200 can be unfolded.

[0043] In the carrier device of this application, when the extension is switched from the unfolded state to the retracted state, the fourth hinge point crosses the line connecting the first hinge point and the third hinge point. That is, by crossing the dead point, the first link and the second link are prevented from rotating to unfold, thereby keeping the extension in the retracted state. Especially when the carrier device is stationary, the retraction can be completed simply by swinging the extension to the retracted state, eliminating the need for locking and corresponding unlocking operations, making the operation more convenient.

[0044] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0045] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A carrying device, comprising a frame with wheels at its bottom and an extension hinged to the frame, the extension being rotatable about a horizontal axis, having an extended state positioned outside the frame and generally horizontally, and a retracted state in which it converges towards the frame, characterized in that, The extension member is hinged to the frame at a first hinge point, and a first connecting rod and a second connecting rod are provided between the extension member and the frame. The first connecting rod is hinged to the frame at a second hinge point, the second connecting rod is hinged to the extension member at a third hinge point, and the first connecting rod and the second connecting rod are hinged to a fourth hinge point. From a side view, in the extended state, the second hinge point, the fourth hinge point, and the third hinge point are aligned on a straight line from high to low. In the retracted state, the fourth hinge point crosses the line connecting the first hinge point and the third hinge point, thus keeping the extension member in the retracted state.

2. The transport device according to claim 1, characterized in that, The frame includes a front frame and a rear frame arranged opposite to each other. The front frame has a front wheel at its bottom and the rear frame has a rear wheel at its bottom. The extension is hinged to the rear frame.

3. The transport device according to claim 2, characterized in that, The front frame and the rear frame are installed vertically; Two side frames are provided between the front frame and the rear frame. The front frame, the rear frame and the two side frames together form an accommodating space. The two side frames are foldable. When folded, the front frame and the rear frame are close to each other.

4. The transport device according to claim 2, characterized in that, The rear frame includes a horizontally arranged upper crossbar and a lower crossbar. The lower crossbar is provided with a connecting seat that is hinged to the extension member. In the unfolded state, the lower crossbar restricts the extension member from flipping downwards. In the stowed state, the upper crossbar restricts the extension member from flipping forwards.

5. The transport device according to claim 1, characterized in that, The first link and the second link are arranged in pairs and are located on both sides of the extension.

6. The transport device according to claim 1, characterized in that, The extension is arranged vertically or tilted forward when folded up.

7. The transport device according to claim 1, characterized in that, The line connecting the first hinge point and the fourth hinge point is the first connecting line, the line connecting the second hinge point and the fourth hinge point is the second connecting line, and the line connecting the third hinge point and the fourth hinge point is the third connecting line. The second connecting line and the third connecting line are shorter than the first connecting line.

8. The transport device according to claim 1, characterized in that, The extension is a standing board for children to stand on.

9. The transport device according to claim 1, characterized in that, Includes a safety guard that prevents the extension from flipping from the stowed state to the unfolded state.

10. The transport device according to claim 9, characterized in that, The safety protection component is a flexible webbing, which has a two-section structure. One end of each section is fixedly connected to the frame, and the other end is provided with a connector. The two sections can be connected or separated through the connector.

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