Manually-adjusted anti-back-turning device

Through the manually adjusted anti-rewinding device, the problem of electric suitcases being back-rewinding on uneven roads or incorrectly operated is solved, which improves the stability and safety of the suitcases, and does not require external power, which facilitates user adjustment and maintenance.

CN120323754APending Publication Date: 2025-07-18陈彦亦
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Patent Information

Application Number
CN202510716947.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-30
Publication Date
2025-07-18

AI Technical Summary

Technical Problem

During the use of existing electric suitcases, due to uneven road surfaces or improper operation, it is easy to cause back-turning, which leads to inconvenience and safety hazards for users. The existing back-turning anti-turning devices rely on electric drives with high cost and inconvenience.

Method used

A manual adjustment anti-rewinding device is designed, including installation components, connection adjustment components, connecting housing and anti-rewinding components. The electric suitcase is prevented from turning back through manual adjustment. The structure is simple and easy to install and disassemble, and no external power supply is required.

Benefits of technology

The stability and safety of the suitcase are improved, and users can adjust according to the road conditions and load conditions to ensure stable driving of the suitcase. The device structure is simple and easy to maintain, avoiding power inconvenience.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of anti-rollover devices, and particularly discloses a manually-adjusted anti-rollover device which comprises a device body. The mounting assembly is arranged on one side of the device body, and the mounting assembly is fixedly connected with the wheel type portable device; one end of the connecting and adjusting assembly extends into the mounting assembly, and the connecting and adjusting assembly is detachably connected with the mounting assembly; the connecting shell is arranged on the other side of the device body, and the other end of the connecting adjusting assembly is connected with the connecting shell; the rear wheel assembly is rotationally connected with the connecting shell; and the anti-back-turning assembly is arranged at the end part of the rear wheel assembly. According to the manually-adjusted backward-turning prevention device, backward turning of the electric luggage case is effectively prevented in a manual adjustment mode, and the stability and safety of the luggage case are greatly improved.
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Description

Technical Field

[0001] The present invention relates to the technical field of anti - tipping devices, and more particularly to a manually adjustable anti - tipping device. Background Art

[0002] In the current market, electric suitcases have become the new favorites of travelers, and they are widely welcomed for their convenience and technological sense. However, in the actual use process, it is not difficult to find that due to the unsatisfactory road conditions or operational mistakes, these electric suitcases sometimes tip over backwards. This situation not only brings great inconvenience to users, but may also cause safety problems and affect the travel experience. To solve this common problem, some specially designed anti - tipping devices have emerged on the market. The original intention of these devices is to improve the stability and safety of the suitcase, ensuring that users can use the suitcase smoothly on various road surfaces. However, most of these anti - tipping devices rely on electric drive technology, which results in relatively high costs. In addition, due to the need for an external power source, these devices are not very convenient to use, which undoubtedly brings additional burdens and restrictions to users.

[0003] Therefore, how to solve the problem that in the process of using existing electric suitcases, due to uneven road surfaces or improper operations, the suitcases are prone to tip over backwards, bringing inconvenience and potential safety hazards to users has become an urgent technical problem for those skilled in the art to solve. Summary of the Invention

[0004] In view of this, in view of the deficiencies of the prior art, the present invention provides a manually adjustable anti - tipping device, aiming to solve the problem that in the process of using existing electric suitcases, due to uneven road surfaces or improper operations, the suitcases are prone to tip over backwards, bringing inconvenience and potential safety hazards to users.

[0005] The present invention provides a manually adjustable anti - tipping device, comprising: A device body; An installation component, arranged on one side of the device body, and the installation component is fixedly connected to a wheeled portable device; A connection and adjustment component, one end of which extends into the interior of the installation component, and the connection and adjustment component is detachably connected to the installation component; A connection housing, arranged on the other side of the device body, and the other end of the connection and adjustment component is connected to the connection housing; A rear - wheel component, rotatably connected to the connection housing; An anti - tipping component, arranged at the end of the rear - wheel component.

[0006] Further, the installation component includes: The installation housing is provided on one side of the device body, and the installation housing includes a first housing and a second housing; A first connecting plate and a second connecting plate are provided between the first housing and the second housing; At both ends of the first connecting plate and both ends of the second connecting plate are respectively connected to the first housing and the second housing; The first connecting plate and the second connecting plate are connected by a partition, and the partition is perpendicularly arranged with respect to the first connecting plate and the second connecting plate respectively; A number of mounting holes are provided through the first connecting plate and the second connecting plate, which are symmetrically distributed with the partition as the axis of symmetry; A first cavity and a second cavity are provided around the first housing, the second housing, the first connecting plate, the second connecting plate and the partition, and a third plug is provided at the same end of the first cavity and the second cavity.

[0007] Further, the installation assembly further includes: A first plug, which is provided at one end of the first housing and is snap-connected to the first housing; A second plug, which is provided at one end of the second housing and is snap-connected to the second housing, and a first through hole is provided on the side of the second housing away from the second plug.

[0008] Further, the connection adjustment assembly includes: There are two first connecting sleeves, and the two first connecting sleeves are symmetrically penetrated through both ends inside the first housing, and the first connecting sleeve is fixedly connected to the first housing; A first connecting rod, one end of which is penetrated inside the first connecting sleeve and is detachably connected to the first connecting sleeve, and the other end of the first connecting rod is connected to the connection housing.

[0009] Further, the connection adjustment assembly further includes: There are two second connecting sleeves, and the two second connecting sleeves are symmetrically penetrated through both ends inside the second housing, and the second connecting sleeve is fixedly connected to the second housing; A second connecting rod, one end of which is penetrated inside the second connecting sleeve and is detachably connected to the second connecting sleeve, and the other end of the second connecting rod is connected to the connection housing.

[0010] Further, a number of second through holes corresponding to the first through hole are provided on the side of the second connecting rod close to the connection housing, and the first through hole and the second through hole are detachably connected by an adjusting bolt.

[0011] Further, the connecting shell includes a first connecting shell and a second connecting shell, the first connecting shell and the second connecting shell are arranged opposite to each other in a vertical direction, and the first connecting shell and the second connecting shell are clamped.

[0012] Furthermore, the rear wheel assembly comprises: A connecting shaft is arranged in a direction parallel to the width direction of the connecting shell, and the connecting shaft is passed through the interior of the connecting shell; The rear wheels are provided with two, and the two rear wheels are symmetrically arranged on both sides of the connecting shaft, the rear wheels are rotatably connected to the connecting shaft, and the ends of the connecting shaft pass through the rear wheels.

[0013] Furthermore, the rear wheel assembly further comprises: A connecting tube is arranged between the rear wheel and the connecting shell, the connecting tube is sleeved outside the connecting shaft, and two ends of the connecting tube are fixedly connected to the rear wheel and the connecting shell respectively.

[0014] Furthermore, the anti-rollover assembly comprises: A steering gear, arranged on a side of the rear wheel away from the connecting cylinder and connected to the connecting shaft; A limited rotation shaft is horizontally arranged inside the steering gear; An anti-roll bar is rotatably connected to the steering gear.

[0015] Compared with the prior art, the beneficial effect of the present invention is that the manually adjustable anti-rollover device provided by the present invention can effectively prevent the electric suitcase from rolling over by manual adjustment, thereby greatly improving the stability and safety of the suitcase. During use, the user can adjust the device by connecting the adjustment components according to the actual conditions of the road or the load of the suitcase to ensure that the suitcase can always maintain a stable driving state. At the same time, the device has a simple structure and is easy to install and disassemble, which is convenient for users to maintain and replace. In addition, due to the manual adjustment method, the device does not require an external power supply, thereby avoiding the inconvenience caused to the user due to power supply problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the manually adjustable anti-rollover device of the present invention; Figure 2 It is a schematic structural diagram of a certain embodiment of the manually adjustable anti-rollover device of the present invention.

[0017] In the figure: 100, device body; 111, first housing; 112, second housing; 1121, first through hole; 113, first connecting plate; 114, partition; 115, mounting hole; 1161, first cavity; 1162, second cavity; 1171, first plug; 1172, second plug; 1173, third plug; 121, first connecting sleeve; 122, first connecting rod; 123, second connecting sleeve; 124, second connecting rod; 125, second through hole; 130, connecting housing; 141, connecting shaft; 142, rear wheel; 143, connecting cylinder; 151, steering gear; 152, anti-roll bar. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present application will be clearly and completely described 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 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.

[0019] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0020] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0021] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0022] Refer to Figure 1-2 As shown, this embodiment provides a manually adjustable anti-rear roll device, including: Device body 100; A mounting assembly, disposed on one side of the device body 100, the mounting assembly being fixedly connected to the wheeled portable device; A connecting and adjusting component, one end of which extends into the interior of the mounting component, and the connecting and adjusting component is detachably connected to the mounting component; A connecting shell 130 is disposed at the other side of the device body 100, and the other end of the connecting adjustment component is connected to the connecting shell 130; A rear wheel assembly, rotatably connected to the connecting housing 130; The anti-rollover assembly is arranged at the end of the rear wheel assembly.

[0023] In this embodiment, the wheeled portable device is preferably an electric suitcase.

[0024] It is understandable that the manually adjustable anti-rollover device provided in this embodiment effectively prevents the electric suitcase from rolling over by manually adjusting the device, thereby greatly improving the stability and safety of the suitcase. During use, the user can adjust the device by connecting the adjustment components according to the actual conditions of the road or the load of the suitcase to ensure that the suitcase can always maintain a stable driving state. At the same time, the device has a simple structure and is easy to install and disassemble, which is convenient for users to maintain and replace. In addition, due to the manual adjustment method, the device does not require an external power supply, thereby avoiding the inconvenience caused to the user by power supply problems.

[0025] Specifically, the installation components include: An installation housing is disposed on one side of the device body 100 , and includes a first housing 111 and a second housing 112 ; A first connecting plate 113 and a second connecting plate are provided between the first shell 111 and the second shell 112; Both ends of the first connecting plate 113 and both ends of the second connecting plate are connected to the first shell 111 and the second shell 112 respectively; The first connecting plate 113 and the second connecting plate are connected via a partition plate 114, and the partition plate 114 is vertically arranged with the first connecting plate 113 and the second connecting plate respectively; The first connecting plate 113 and the second connecting plate are both provided with a plurality of mounting holes 115 symmetrically distributed with the partition plate 114 as the symmetry axis; The first cavity 1161 and the second cavity 1162 are arranged around the first shell 111 , the second shell 112 , the first connecting plate 113 , the second connecting plate and the partition plate 114 , and a third plug 1173 is arranged at the same end of the first cavity 1161 and the second cavity 1162 .

[0026] It can be understood that the installation component is fixedly connected to the wheeled portable device through the installation holes 115, ensuring the stability and reliability between the device body 100 and the electric luggage. During use, the user can conveniently and firmly install the device body 100 at the designated position of the electric luggage through the installation holes 115, thus avoiding potential safety hazards caused by device loosening. At the same time, the settings of the first cavity 1161 and the second cavity 1162 also provide necessary protection and support for the components inside the device, further enhancing the overall strength and durability of the device.

[0027] Specifically, the installation component further includes: The first plug 1171 is arranged at one end of the first housing 111, and the first plug 1171 is snap-connected to the first housing 111; The second plug 1172 is arranged at one end of the second housing 112, and the second plug 1172 is snap-connected to the second housing 112. A first through hole 1121 is provided on the side of the second housing 112 away from the second plug 1172.

[0028] It can be understood that the settings of the first plug 1171 and the second plug 1172 further enhance the sealing performance and stability of the installation component. During use, the first plug 1171 and the second plug 1172 can effectively prevent impurities such as dust and moisture from entering the device interior, thus avoiding device failures or damages caused by impurity accumulation. At the same time, the setting of the first through hole 1121 also provides a necessary channel for the insertion of the connection adjustment component, ensuring a smooth connection between the connection adjustment component and the installation component. In addition, the snap-connection method of the first plug 1171 and the second plug 1172 with the housing also makes the installation and disassembly process simpler and faster, facilitating maintenance and replacement by the user.

[0029] Specifically, the connection adjustment component includes: There are two first connection sleeves 121, and the two first connection sleeves 121 are symmetrically inserted at both ends inside the first housing 111, and the first connection sleeves 121 are fixedly connected to the first housing 111; One end of the first connecting rod 122 is inserted inside the first connection sleeve 121 and is detachably connected to the first connection sleeve 121, and the other end of the first connecting rod 122 is connected to the connection housing 130.

[0030] It is understandable that the user can adjust the length of the first connecting rod 122 inside the first housing 111 according to actual needs to achieve telescopic adjustment of the connection adjustment assembly, thereby achieving precise control of the height and angle of the entire anti-rollover device. This adjustment method is not only flexible and convenient, but also can effectively adapt to different road surfaces and load conditions to ensure the stability and safety of the luggage case. At the same time, the detachable connection between the first connecting sleeve 121 and the first connecting rod 122 also makes the maintenance and replacement process simpler and faster, reducing the user's use cost.

[0031] Specifically, the connection adjustment component also includes: There are two second connecting sleeves 123, which are symmetrically arranged at two ends of the second shell 112, and the second connecting sleeves 123 are fixedly connected to the second shell 112; One end of the second connecting rod 124 is inserted into the second connecting sleeve 123 and is detachably connected to the second connecting sleeve 123 . The other end of the second connecting rod 124 is connected to the connecting shell 130 .

[0032] It is understandable that the provision of the second connecting rod 124 further enhances the stability and reliability of the connection adjustment assembly. During use, the user can adjust the length of the first connecting rod 122 and the second connecting rod 124 at the same time to achieve a more precise adjustment of the anti-rollover device to adapt to more complex and changeable road surfaces and load conditions. At the same time, the detachable connection between the second connecting sleeve 123 and the second connecting rod 124 also makes the assembly and disassembly process of the entire device more flexible and convenient, further improving the user's experience. In addition, the connection between the first connecting rod 122 and the second connecting rod 124 and the connecting shell 130 also adopts a detachable design, which not only facilitates the user's maintenance and replacement, but also makes the entire device more modular, which is convenient for the user to customize and upgrade according to actual conditions.

[0033] Specifically, a plurality of second through holes 125 corresponding to the first through holes 1121 are formed on one side of the second connecting rod 124 close to the connecting housing 130 , and the first through holes 1121 and the second through holes 125 are detachably connected via adjusting bolts.

[0034] It is understandable that, by adjusting the bolt, the user can easily fix or disassemble the second connecting rod 124 and the connecting housing 130. This detachable connection not only improves the flexibility and convenience of the device, but also makes it easier for the user to maintain and replace parts. At the same time, the second through hole 125 also provides a necessary channel for the adjusting bolt to extend into, ensuring a stable connection between the connecting adjustment assembly and the connecting housing 130, further enhancing the stability and reliability of the entire anti-rollover device.

[0035] It can be understood that since there are several second through holes 125, the user can select the first connecting rod 122 and the second connecting rod 124 to appropriate positions and then fix them by adjusting bolts, thereby realizing the adjustment of the telescopic length of the anti-backward tipping device to adapt to electric suitcases of different sizes and types. This design not only improves the versatility and practicality of the device, but also enables the user to adjust more conveniently according to actual needs during use, ensuring the stability and safety of the suitcase. At the same time, the use of adjusting bolts also makes the connection more firm and reliable, avoiding potential safety hazards caused by loose connections.

[0036] Specifically, the connecting housing 130 includes a first connecting housing 130 and a second connecting housing 130. The first connecting housing 130 and the second connecting housing 130 are arranged opposite to each other in the vertical direction, and the first connecting housing 130 and the second connecting housing 130 are snap-connected.

[0037] It can be understood that the snap-connection method of the first connecting housing 130 and the second connecting housing 130 not only makes the connection more firm and reliable, but also facilitates the assembly and disassembly by the user. During use, the user can simply snap or separate the first connecting housing 130 and the second connecting housing 130 to achieve the quick installation or disassembly of the connecting housing 130, thereby improving the convenience and practicality of the device. At the same time, the design that the first connecting housing 130 and the second connecting housing 130 are arranged opposite to each other in the vertical direction also makes the entire connecting housing 130 more stable, capable of effectively supporting the rear wheel assembly and the anti-backward tipping assembly, ensuring the stability and safety of the suitcase during driving.

[0038] Specifically, the rear wheel assembly includes: A connecting shaft 141, arranged in a direction parallel to the width direction of the connecting housing 130, and the connecting shaft 141 passes through the inside of the connecting housing 130; Two rear wheels 142, symmetrically arranged on both sides of the connecting shaft 141. The rear wheels 142 are rotatably connected to the connecting shaft 141, and the ends of the connecting shaft 141 extend out of the rear wheels 142.

[0039] It can be understood that the rear wheel assembly is rotatably connected to the connecting housing 130 through the connecting shaft 141, ensuring that the suitcase can turn flexibly during driving, improving the flexibility and maneuverability of the suitcase. At the same time, the two rear wheels 142 are symmetrically arranged on both sides of the connecting shaft 141, not only improving the stability of the suitcase, but also making the suitcase more stable during driving, reducing bumps and vibrations, and further improving the user's riding experience. In addition, the design that the ends of the connecting shaft 141 extend out of the rear wheels 142 also provides a necessary channel for the disassembly and replacement of the rear wheels 142, facilitating the user's maintenance and upkeep.

[0040] Specifically, the rear wheel assembly further includes: A connecting cylinder 143 is disposed between the rear wheel 142 and the connecting housing 130. The connecting cylinder 143 is sleeved outside the connecting shaft 141, and both ends of the connecting cylinder 143 are fixedly connected to the rear wheel 142 and the connecting housing 130 respectively.

[0041] It can be understood that the setting of the connecting cylinder 143 further enhances the stability and reliability of the rear wheel assembly. During use, the connecting cylinder 143 can effectively prevent relative displacement between the rear wheel 142 and the connecting housing 130, thus avoiding potential safety hazards caused by loosening. At the same time, the connecting cylinder 143 also plays a role in shock absorption and buffering, which can reduce the impact and vibration received by the luggage during driving, further improving the user's riding comfort and the service life of the luggage. In addition, the fixed connection method of the connecting cylinder 143 with the connecting shaft 141 and the connecting housing 130 also makes the assembly and disassembly process of the entire rear wheel assembly simpler and faster, facilitating maintenance and replacement by the user.

[0042] Specifically, the anti - rear - flip assembly includes: A steering gear 151 is disposed on the side of the rear wheel 142 away from the connecting cylinder 143 and is connected to the connecting shaft 141; A limit rotating shaft is horizontally inserted into the steering gear 151; An anti - flip rod 152 is rotatably connected to the steering gear 151.

[0043] It can be understood that the anti - rear - flip assembly effectively prevents the luggage from flipping backward through the settings of the steering gear 151 and the limit rotating shaft. During use, when the luggage is subjected to external forces or the inclination angle is too large, the anti - flip rod 152 is adjusted through the limit rotating shaft, so that the anti - flip rod 152 extends out in time and abuts against the ground, thereby preventing the luggage from continuing to flip backward. This not only improves the stability and safety of the luggage, but also enables the user to carry luggage more reassuringly during use. At the same time, the cooperation between the steering gear 151 and the limit rotating shaft has been carefully designed and debugged to ensure the sensitivity and reliability of the entire anti - rear - flip assembly. In addition, the rotatable connection method of the anti - flip rod 152 with the steering gear 151 enables the anti - rear - flip assembly to be retracted when not needed, avoiding inconvenience in walking or potential safety hazards caused by the extension of the anti - flip rod 152.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A manually adjustable anti-backward overturning device, characterized in that, Comprising: Device body; Mounting assembly, arranged on one side of the device body, and the mounting assembly is fixedly connected to the wheeled portable device; Connection adjustment assembly, one end extending into the interior of the mounting assembly, and the connection adjustment assembly is detachably connected to the mounting assembly; Connection housing, arranged on the other side of the device body, and the other end of the connection adjustment assembly is connected to the connection housing; Rear wheel assembly, rotatably connected to the connection housing; Anti-backflip assembly, arranged at the end of the rear wheel assembly.

2. The manually adjustable anti-backward overturning device according to claim 1, wherein The mounting assembly includes: Mounting housing, arranged on one side of the device body, and the mounting housing includes a first housing and a second housing; A first connecting plate and a second connecting plate are arranged between the first housing and the second housing; Both ends of the first connecting plate and both ends of the second connecting plate are respectively connected to the first housing and the second housing; The first connecting plate and the second connecting plate are connected by a partition, and the partition is respectively perpendicular to the first connecting plate and the second connecting plate; A plurality of mounting holes are respectively provided through the first connecting plate and the second connecting plate, which are symmetrically distributed with the partition as the axis of symmetry; A first cavity and a second cavity are arranged around the first housing, the second housing, the first connecting plate, the second connecting plate and the partition, and a third plug is arranged at the same end of the first cavity and the second cavity.

3. The manually adjustable anti-backward-turning device according to claim 2, wherein The mounting assembly further includes: A first plug, arranged at one end of the first housing, and the first plug is snap-connected to the first housing; A second plug, arranged at one end of the second housing, and the second plug is snap-connected to the second housing, and a first through hole is provided on the side of the second housing away from the second plug.

4. The manually adjustable anti-backward-turning device according to claim 3, characterized in that, The connection adjustment assembly includes: Two first connection sleeves, symmetrically penetrating through both ends inside the first housing, and the first connection sleeves are fixedly connected to the first housing; A first connecting rod, one end penetrating through the inside of the first connection sleeve and being detachably connected to the first connection sleeve, and the other end of the first connecting rod is connected to the connection housing.

5. The manually adjustable anti-backward overturning device according to claim 4, characterized in that, The connection adjustment assembly further includes: Two second connection sleeves, symmetrically penetrating through both ends inside the second housing, and the second connection sleeves are fixedly connected to the second housing; A second connecting rod, one end penetrating through the inside of the second connection sleeve and being detachably connected to the second connection sleeve, and the other end of the second connecting rod is connected to the connection housing.

6. The manually adjustable anti-backward overturning device according to claim 5, wherein A plurality of second through holes corresponding to the first through holes are provided on the side of the second connecting rod close to the connection housing, and the first through hole and the second through hole are detachably connected by an adjusting bolt.

7. The manually adjustable anti-backward tipping device according to claim 6, wherein, The connection housing includes a first connection housing and a second connection housing, the first connection housing and the second connection housing are arranged opposite to each other in the vertical direction, and the first connection housing and the second connection housing are snap-connected.

8. The manually adjustable anti-backward overturning device according to claim 7, wherein The rear wheel assembly includes: Connection shaft, arranged in a direction parallel to the width direction of the connection housing, and the connection shaft penetrates through the inside of the connection housing; Rear wheels, there are two of them, and the two rear wheels are symmetrically arranged on both sides of the connecting shaft. The rear wheels are rotatably connected to the connecting shaft, and the ends of the connecting shaft penetrate through the rear wheels.

9. The manually adjustable anti-backward overturning device according to claim 8, characterized in that, The rear wheel assembly further includes: A connecting cylinder, which is arranged between the rear wheel and the connecting housing. The connecting cylinder is sleeved outside the connecting shaft, and both ends of the connecting cylinder are fixedly connected to the rear wheel and the connecting housing respectively.

10. The manually adjustable anti-backward overturning device according to claim 9, characterized in that, The anti-backward overturning assembly includes: A steering gear, which is arranged on the side of the rear wheel away from the connecting cylinder and is connected to the connecting shaft; A limiting rotating shaft, which is horizontally arranged in the steering gear; An anti-overturning rod, which is rotatably connected to the steering gear.