Backrest structure and foldable trolley
Patent Information
- Application Number
- CN202522508495.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-26
AI Technical Summary
The existing foldable trolleys have a single fixed backrest structure, which cannot simultaneously constrain the folding shape, making them prone to loosening. In addition, the fixing position of the connecting parts is rigid and has poor adaptability, so the original structure of the trolley needs to be modified.
The folding shape of the trolley body is simultaneously fixed by winding the backrest body and the connecting parts together. It adopts multiple fixing position designs to adapt to trolleys with different structures without modifying the original structure.
It effectively prevents the trolley from springing back and scattering, avoids relative displacement between the backrest and the trolley, has a wide range of compatibility, and improves the reliability of fixation and ease of use.
Smart Images
Figure CN224929058U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of handcart technology, and particularly relates to a backrest structure and a foldable handcart. Background Technology
[0002] The existing backrest structure of foldable trolleys has two major shortcomings: First, the fixing function is limited, only fixing the main body of the trolley and unable to simultaneously constrain the folding shape of both, which easily leads to the double loosening problem of relative displacement and rebound; Second, the fixing position of the connector is rigid, limited to a single position, with poor adaptability. The original structure of the trolley needs to be modified to adapt to different types of trolleys, which is cumbersome to use and has a narrow range of applications.
[0003] Therefore, there is an urgent need for a backrest structure and a foldable trolley to solve the above problems. Utility Model Content
[0004] This application provides a backrest structure and a foldable trolley to at least solve the above-mentioned problems in the related art.
[0005] To achieve the above objectives, this application provides the following technical solution: a backrest structure, the backrest structure comprising: The backrest body can be installed on the external foldable trolley body, and the backrest body can be folded synchronously with the trolley body. The first connector has one end fixedly connected to the outer side of the backrest body; The second connector, one end of which is fixedly connected to the outer side of the backrest body, the first connector, or the external trolley body; wherein... The first connector wraps around the outer periphery of the folded trolley body and is detachably connected to the second connector to simultaneously fix the folded state of the backrest body and the trolley body.
[0006] In some alternative embodiments, the backrest body is provided with a folding guide for forming a crease to define the folding path of the backrest body; The backrest body, the first connector, and the second connector, after being folded along the folding guide, are wrapped around the outer periphery of the folded trolley body to simultaneously fix the folded state of the backrest body and the trolley body.
[0007] In some alternative embodiments, the folding guide extends along the height direction of the backrest body, and there are multiple folding guides, which are spaced apart along the width direction of the backrest body.
[0008] In some alternative embodiments, at least one of the first connector and the second connector is an elastically stretchable band, and the first connector and the second connector are detachably connected by a buckle. When the first connector is an elastic band, the other end of the first connector is provided with a male buckle, and the second connector is a female buckle; When the second connector is an elastic band, the other end of the second connector is provided with a male buckle, and the first connector is a female buckle; When both the first connector and the second connector are elastic bands, the other end of the first connector is provided with a male buckle, and the other end of the second connector is provided with a female buckle.
[0009] In some optional embodiments, the backrest body has an arc-shaped structure, the outer surface of which is an outwardly convex surface of the arc-shaped structure, and the fixing connection points of the first connector, the second connector and the backrest body are distributed at intervals along the width direction of the backrest body.
[0010] In some alternative embodiments, the backrest body includes a first fabric layer, a second fabric layer, and a shape-retaining layer, wherein the shape-retaining layer is disposed between the first fabric layer and the second fabric layer, and the shape-retaining layer is used to restore the original shape when the backrest body is unfolded.
[0011] In some alternative embodiments, the conformal layer is made of any one of sponge, thermoplastic polyurethane, or ethylene-vinyl acetate copolymer, and the folding guide is a crease line formed by a creasing process, which forms a crease to define the folding path of the backrest body.
[0012] In some alternative embodiments, the backrest body is made of any one of martensitic stainless steel, spring steel, ABS plastic or PVC plastic, and the folding guide is a strip groove opened along the height direction of the backrest body. The folding guide forms a crease through the strip groove to limit the folding path of the backrest body.
[0013] In some alternative embodiments, this application also provides a foldable trolley, which includes a backrest structure and a trolley body, wherein the backrest body of the backrest structure is detachably connected to the trolley body.
[0014] In some optional embodiments, the backrest body has a first mounting hole at one end in the width direction, and the number of the first mounting holes is at least one; the backrest body has a second mounting hole at the other end in the width direction, and the number of the second mounting holes is at least one. The first mounting hole and the second mounting hole are respectively used for corresponding fasteners to pass through. Each fastener passes through a corresponding first mounting hole and is threaded to the trolley body to fix one end of the backrest body. Each fastener passes through a corresponding second mounting hole and is threaded to the trolley body to fix the other end of the backrest body.
[0015] In the aforementioned backrest structure, on the one hand, by winding the backrest body and the connecting piece together, the folded shape of the trolley body is fixed to prevent the trolley body from springing back and unfolding, and the folded state of the backrest itself is also fixed to prevent relative displacement between the backrest and the trolley. This solves the double loosening problem caused by fixing only the trolley or only the backrest. On the other hand, the second connecting piece can be fixed to the outer side of the backrest body, the first connecting piece, or one of the external trolley body. Through the three fixing positions, it can adapt to foldable trolleys with different structures. For example, when the trolley has no additional connecting position, it is fixed to the backrest body or the first connecting piece; when the trolley has a preset fixing position, it is directly fixed to the trolley body without modifying the original structure of the trolley, thus having a wide range of adaptability. In this way, by simultaneously fixing the folded state of the backrest structure and the trolley body, the loosening caused by a single fixing is avoided, and the three fixing methods of the second connecting piece can still adapt to different trolley structures without modifying the original design of the trolley.
[0016] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description
[0017] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
[0018] Figure 1 A schematic diagram of the backrest structure in an embodiment of this application is shown; Figure 2 This invention provides a schematic diagram of the structure of the handcart when it is unfolded, as shown in an embodiment of this application. Figure 3 This invention provides a schematic diagram of the folded structure of the handcart in an embodiment of this application. Figure 4 This illustration shows a structural diagram of the handcart folded in an embodiment of this application from another perspective.
[0019] The following are the labels in the diagram: 10. Backrest structure; 11. Backrest body; 111. First mounting hole; 112. Second mounting hole; 113. Folding guide; 12. First connector; 13. Second connector; 14. Buckle; 141. Male buckle; 142. Female buckle; 20. Trolley body; 21. Left bracket; 22. Right bracket; 23. Cross-scissor foldable bracket. Detailed Implementation
[0020] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in 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.
[0021] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this application can be achieved, and this is not limited herein.
[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.
[0023] The existing backrest structure of foldable trolleys has two major shortcomings: First, the fixing function is limited, only fixing the main body of the trolley and unable to simultaneously constrain the folding shape of both, which easily leads to the double loosening problem of relative displacement and rebound; Second, the fixing position of the connector is rigid, limited to a single position, with poor adaptability. The original structure of the trolley needs to be modified to adapt to different types of trolleys, which is cumbersome to use and has a narrow range of applications.
[0024] To address the aforementioned issues, the backrest body and the connecting piece are wrapped together to both fix the folded shape of the trolley body, preventing it from springing back and unfolding, and to maintain the folded state of the backrest itself, avoiding relative displacement between the backrest and the trolley. This solves the double loosening problem caused by fixing only the trolley or only the backrest. The second connecting piece can be fixed to the outer side of the backrest body, the first connecting piece, or one of the external trolley body. This three-position design allows for compatibility with foldable trolleys of different structures. For example, when the trolley has no additional connecting position, it is fixed to the backrest body or the first connecting piece; when the trolley has a preset fixing position, it is directly fixed to the trolley body without modifying the original structure of the trolley, thus providing a wide range of compatibility and solving the aforementioned problems.
[0025] The embodiments of this application are described below with reference to the accompanying drawings.
[0026] In some embodiments, this application provides a backrest structure 10, which includes a backrest body 11, a first connector 12, and a second connector 13. The backrest body 11 can be mounted on an external foldable trolley body 20, and the backrest body 11 can be folded synchronously with the trolley body 20. One end of the first connector 12 is fixedly connected to the outer side of the backrest body 11. One end of the second connector 13 is fixedly connected to the outer side of the backrest body 11, the first connector 12, or the external trolley body 20. The first connector 12 is wrapped around the outer periphery of the folded trolley body 20 and is detachably connected to the second connector 13 to simultaneously fix the folded state of the backrest body 11 and the trolley body 20.
[0027] In the aforementioned backrest structure 10, on the one hand, by winding the backrest body 11 and the connecting piece together, the folded shape of the trolley body 20 is fixed to prevent the trolley body 20 from springing back and unfolding, and the folded state of the backrest itself is also fixed to prevent relative displacement between the backrest and the trolley, thus solving the double loosening problem caused by fixing only the trolley or only the backrest; on the other hand, the second connecting piece 13 can be fixed to the outer side of the backrest body, the first connecting piece 12, or one of the external trolley body 20, through a three-position fixing design. It can be adapted to foldable trolleys with different structures. For example, when the trolley has no additional connection position, it is fixed to the backrest body 11 or the first connector 12; when the trolley has a preset fixing position, it is directly fixed to the trolley body 20 without changing the original structure of the trolley, and has a wide range of compatibility. In this way, by simultaneously fixing the folded state of the backrest structure 10 and the trolley body 20, the looseness caused by a single fixing is avoided, and the three fixing methods of the second connector 13 can still adapt to different trolley structures without changing the original design of the trolley.
[0028] It should be noted that when the second connector 12 is fixedly connected to the outer side of the backrest body, and the first connector 12 is detachably connected to the second connector 13, a part of the backrest body 11 (the folded part of the backrest body 11), the first connector 12, and the second connector 13 form a closed annular winding structure. When the second connector 13 is fixedly connected to the first connector 12, the first connector 12 surrounds the folded trolley and forms a closed annular winding structure. When the second connector 13 is fixedly connected to the trolley body 20, the first connector 12 is wrapped around a part of the trolley and forms a semi-closed annular winding structure. This structure is more natural and has a lower cost. However, for some models of foldable trolleys, the space of the trolley body 20 is limited, making it inconvenient to install the second connector 13. Therefore, the three fixed position designs can adapt to foldable trolleys with different structures.
[0029] Please see Figure 1 and Figure 2In some embodiments, the backrest body 11 can be mounted on the external foldable trolley body 20. The backrest body 11 is provided with a folding guide 113, which is used to form creases to limit the folding path of the backrest body 11. The creases make the backrest body 11 form a segmented structure. Compared with the one-piece structure, which can only achieve disordered folding, the aesthetics are not good and it is easy to break apart. The segmented structure has the effect of predictable folding shape and folding direction. The backrest body 11, the first connector 12 and the second connector 13 after folding along the folding guide 13 are wrapped around the outer periphery of the folded trolley body 20 to simultaneously fix the folded state of the backrest body 10 and the trolley body 20.
[0030] In this way, the folding guide 113 provides a clear folding path for the backrest body 11, so that the backrest body 11 can be folded into a regular shape that fits the outline of the trolley body 20 along the preset direction, so as to avoid irregular protrusions after folding, thereby effectively reducing the folding space and improving the aesthetics after folding.
[0031] It should be noted that in this application, the height direction of the backrest body 11 is also the height direction of the foldable trolley, and the width direction of the backrest body 11 is also the left and right direction of the foldable trolley.
[0032] Please see Figure 1 In some embodiments, the folding guide portion 113 extends along the height direction of the backrest body 11, and there are multiple folding guide portions 113, which are distributed at intervals along the width direction of the backrest body 11.
[0033] Thus, when the backrest body 11 is subjected to force, multiple folding guides 113 extending along the height direction of the backrest body 11 simultaneously form parallel creases. Because they are spaced apart along the width direction, when the backrest body 11 is folded layer by layer along these creases, it can fit the folding space of the trolley body 20, effectively reducing the space occupied by the backrest body 11, and achieving neat stacking through spaced distribution; at the same time, it also avoids the material of the backrest body 11 from twisting, extending the service life of the backrest body 11.
[0034] Please see Figure 1 In some embodiments, at least one of the first connector 12 and the second connector 13 is an elastically stretchable elastic band. That is, the first connector 12 is an elastically stretchable elastic band; or, the second connector 13 is an elastically stretchable elastic band; or, both the first connector 12 and the second connector 13 are elastically stretchable elastic bands.
[0035] Thus, when the first connector 12 and the second connector 13 are wrapped around the folded trolley body 20, at least one of the first connector 12 and the second connector 13 will elastically stretch along the outer periphery of the trolley body 20, generating continuous contraction tension. After the connection is fixed, this tension is maintained to keep the two tightly fitted. When unfolded, the elastic band automatically returns to its original length after the connection is removed. This process not only demonstrates the elastic adaptation function of the elastic band, but also realizes the tension fixing function. Ultimately, it can accommodate the size error of the trolley body 20, adapt to more models, improve the tightness of the wrapping, reduce the shaking noise during transportation, and reduce the risk of collision damage to components through elastic cushioning.
[0036] Please see Figure 1 In some optional embodiments, the first connector 12 and the second connector 13 are detachably connected by a buckle 14; when the first connector 12 is an elastic band, the other end of the first connector 12 is provided with a male buckle 141, and the second connector 12 is provided with a female buckle 142; when the second connector 13 is an elastic band, the other end of the second connector 13 is provided with a male buckle 141, and the first connector 12 is provided with a female buckle 142; when both the first connector 12 and the second connector 13 are elastic bands, the other end of the first connector 12 is provided with a male buckle 141, and the other end of the second connector 13 is provided with a female buckle 142.
[0037] Thus, after the first connector 12 and the second connector 13 are wrapped together, the male buckle 141 fixed to the other end of the first connector 12 is aligned with the female buckle 142 at the other end of the second connector 13 and pressed down, and the two are locked by the buckle structure; when unfolded, the female buckle 142 can be separated by pressing the unlocking device. This process realizes the quick mechanical locking and unlocking function of the buckle 14. Compared with Velcro or straps, the connection and separation operation time is shorter, the anti-falling ability is stronger, and the buckling status can be visually confirmed, reducing misoperation and improving the fixation reliability and operation efficiency.
[0038] In some alternative embodiments, the first connector 12 and the second connector 13 are detachably connected by Velcro. When the first connector 12 is an elastic band, the other end of the first connector 12 has a hook side of Velcro, and the second connector 13 has a loop side of Velcro; when the second connector 13 is an elastic band, the other end of the second connector 13 has a hook side of Velcro, and the first connector 12 has a loop side of Velcro; when both the first connector 12 and the second connector 13 are elastic bands, the other end of the first connector 12 has a hook side of Velcro, and the other end of the second connector 13 has a loop side of Velcro.
[0039] It should be noted that the detachable connection structure between the first connector 12 and the second connector 13 listed above is merely an example, and this application does not limit the specific detachable connection structure between the first connector 12 and the second connector 13.
[0040] In some embodiments, the backrest body 11 has an arc-shaped structure, and the outer surface is an outwardly convex surface of the arc-shaped structure. The fixed connection points of the first connector 12, the second connector 13 and the backrest body 11 are distributed at intervals along the width direction of the backrest body 11.
[0041] Thus, the curved backrest body 11 can naturally conform to the human back, dispersing back pressure through the curved surface and achieving ergonomic support, reducing back pressure and improving comfort. At the same time, the first connector 12 and the second connector 13 are spaced apart along the width direction, forming a balanced constraint force when wrapped symmetrically from both sides, improving the reliability of fixation. Moreover, the width structure of the backrest body 11 itself can be used to form part of the enclosure structure of the trolley body 20, so as to reduce the overall length of the first connector 12 and the second connector 13. Especially when the first connector 12 and the second connector 13 are made of stretchable elastic bands, the stretching length of the elastic bands can be reduced, thereby reducing the tensile fatigue of the elastic bands and improving the service life of the elastic bands.
[0042] In some embodiments, the backrest body 11 includes a first fabric layer, a second fabric layer, and a shape-retaining layer. The shape-retaining layer is disposed between the first fabric layer and the second fabric layer. The shape-retaining layer is used to restore the original shape when the backrest body 11 is unfolded. The shape-retaining layer has elastic recovery or shape memory characteristics. After the backrest body 11 is folded, it can quickly and autonomously restore to the preset shape (such as an arc) of the unfolded state by releasing the fasteners, without the need for manual adjustment by the user, greatly improving the convenience of use. For example, the first fabric layer may be a skin-friendly fabric or leather material, and the second fabric layer may be a fabric or leather material.
[0043] Thus, the double-layered fabric serves as both inner and outer protective and contact layers. Soft and wear-resistant materials (such as cotton, nylon, or leather) can be selected according to requirements, ensuring both comfort in contact with the human body and resistance to external environmental abrasion. The middle shaping layer, as the core functional layer, independently undertakes the function of shaping and restoring, avoiding the problem of weak support and easy collapse when the fabric layer is used alone. The structure has a clear division of labor, balancing practicality and durability.
[0044] In some embodiments, the conformal layer is made of any one of sponge, thermoplastic polyurethane, or ethylene-vinyl acetate copolymer, and the folding guide 113 is a crease line formed by a creasing process. The folding guide 113 forms a crease through the crease line to define the folding path of the backrest body 11.
[0045] Thus, the three selected materials are all typical materials with high flexibility, good bendability and reversibility of deformation, low resistance when folding, easy operation, and small size after folding. They can be tightly wrapped around the outer perimeter of the folded trolley body 20 without increasing the storage volume and weight of the trolley.
[0046] It should be noted that all three materials possess a certain degree of elasticity and cushioning performance. The sponge is soft and skin-friendly, offering excellent cushioning; thermoplastic polyurethane (TPU) is flexible yet strong, with good shape retention and no permanent deformation after folding; ethylene-vinyl acetate copolymer (EVA) is lightweight, flexible, and highly weather-resistant, making it suitable for outdoor use. All three provide adequate support while slightly deforming upon contact with the body, enhancing the tactile experience and avoiding discomfort from hard contact. Crease lines can be sewn along the height of the backrest body 11 using a sewing machine, increasing the local density of the flexible composite structure and reducing its bending stiffness. No extra force is required during folding, which is particularly suitable for the material characteristics of the flexible shape-retaining layer, avoiding folding difficulties or messy shapes caused by the lack of fixed creases in the flexible material.
[0047] In some embodiments, the backrest body 11 is made of any one of martensitic stainless steel, spring steel, ABS plastic (acrylonitrile-butadiene-styrene copolymer) or PVC plastic (polyvinyl chloride). The folding guide 113 is a strip groove opened along the height direction of the backrest body 11. The area of the backrest body 11 corresponding to the strip groove forms a thinning area. The folding guide 113 forms a crease through the strip groove to define the folding path of the backrest body 11.
[0048] Thus, the selected materials are all typical rigid materials. Martensitic stainless steel and spring steel have high hardness and high toughness, can withstand large loads, and are suitable for heavy-duty handcarts (such as cargo transport handcarts). They are impact-resistant and not easily deformed. ABS plastic and PVC plastic are lightweight and have good formability. They can be made into a curved structure that fits the human body through injection molding, which takes into account both rigid support and user comfort, while keeping costs under control. After the two metal materials are thinned by the strip grooves, they can be elastically bent along the direction of the grooves. After folding, they rely on the toughness of the materials themselves to maintain the folded state and quickly spring back to their original position when unfolded. The two plastic materials have a certain degree of bending toughness. The strip grooves can create a flexible hinge effect in some areas, which can achieve repeated folding without cracking. This solves the technical pain points of traditional rigid materials being difficult to fold and easy to break when folded.
[0049] In some preferred embodiments, the thinned crease area is formed by forming a strip groove on the inner side of the backrest body 11; or by forming a strip groove on the outer side of the backrest body 11; or by forming strip grooves simultaneously on the inner and outer sides of the backrest body 11 at relative positions (the center lines of the strip grooves are aligned and the groove widths are consistent).
[0050] It should be noted that the materials used in the above-mentioned conformal layer are merely examples and are not intended to limit the scope of protection of this application. This application does not impose strict limitations on the specific materials used in the conformal layer. The core criterion is that the material can be folded along the folding guide 113 when folded and can restore the preset shape when unfolded. Any material that meets these mechanical performance requirements falls within the scope of protection of this application.
[0051] In some embodiments, the elastic band is an elastic woven band or an elastic rubber band. Applications of elastic woven bands: Under stress, the warp and weft woven structure stretches synchronously to generate uniform tension. After long-term use, it maintains its performance without permanent deformation due to fiber elasticity, demonstrating high-strength, wear-resistant, and elastic connection function, resulting in a longer service life and suitability for high-frequency use scenarios. Applications of elastic rubber bands: Under external force, the rubber molecular chains stretch to generate high elastic recovery force. It maintains flexibility and does not harden even in low-temperature environments, achieving a high-elasticity, low-cost connection function with a higher elastic recovery rate, suitable for low-cost, lightweight applications.
[0052] Please see Figure 2 In some embodiments, this application also provides a foldable trolley, which includes a backrest structure 10 and a trolley body 20, wherein the backrest body 11 of the backrest structure 10 is detachably connected to the trolley body 20.
[0053] In this way, when the trolley is in use, the backrest structure 10 is fixed to the main body through a detachable connection to provide back support; when folding, the trolley main body 20 is folded first, then the backrest main body 11 is folded along the backrest guide, and finally the two are fixed by wrapping them together with the connector. This achieves the functions of support when in use and coordinated retraction when folding, and also enables the independent maintenance function of the components through the detachable connection, thus taking into account both storage convenience and maintenance economy.
[0054] Please see Figure 2 In some embodiments, the backrest body 11 has a first mounting hole 111 at one end in the width direction, and the number of first mounting holes 111 is at least one. The backrest body 11 has a second mounting hole 112 at the other end in the width direction, and the number of second mounting holes 112 is at least one. The first mounting hole 111 and the second mounting hole 112 are respectively used for corresponding fasteners to pass through. Each fastener passes through a corresponding first mounting hole 111 and is threadedly connected to the trolley body 20 to fix one end of the backrest body 11. Each fastener passes through a corresponding second mounting hole 112 and is threadedly connected to the trolley body 20 to fix the other end of the backrest body 11. Exemplarily, the fastener is a screw.
[0055] Thus, threaded connection is a mature connection method that is convenient and quick to operate. When there is only one hole, it can meet the requirements of lightweight and low-load scenarios. The structure is simple, the assembly is convenient, and the production and use costs are reduced. When there are ≥2 holes, multi-point fixation can be formed, which further enhances the connection strength, is suitable for heavy-load and high-frequency use scenarios, and prevents the backrest body 11 from tilting or deforming after being subjected to force. At the same time, multi-point fixation can also reduce the possibility of slight rotation of the backrest body 11 around the thread axis.
[0056] Please see Figure 2 In some embodiments, the trolley body 20 includes a left support 21, a right support 22, and a cross-scissor foldable support 23. The foldable support is located between the left support 21 and the right support 22 and is used to drive the left support 21 and the right support 22 to fold closer together or unfold further apart in the left and right directions. It should be noted that the left support 21, the right support 22, and the cross-scissor foldable support 23 are all existing components and will not be described in detail here.
[0057] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A backrest structure, characterized in that, The backrest structure includes: The backrest body can be installed on the external foldable trolley body, and the backrest body can be folded synchronously with the trolley body. A first connector, one end of which is fixedly connected to the outer side of the backrest body; A second connector, one end of which is fixedly connected to the outer side of the backrest body, the first connector, or an external trolley body; wherein... The first connector is wrapped around the outer periphery of the folded trolley body and is detachably connected to the second connector to simultaneously fix the folded state of the backrest body and the trolley body.
2. The backrest structure according to claim 1, characterized in that, The backrest body is provided with a folding guide, which is used to form a crease to limit the folding path of the backrest body; The backrest body, the first connector, and the second connector, after being folded along the folding guide, are wrapped together around the outer periphery of the folded trolley body to simultaneously fix the folded state of the backrest body and the trolley body.
3. The backrest structure according to claim 2, characterized in that, The folding guide extends along the height direction of the backrest body, and there are multiple folding guides, which are spaced apart along the width direction of the backrest body.
4. The backrest structure according to claim 1, characterized in that, At least one of the first connector and the second connector is an elastic band that can be stretched elastically, and the first connector and the second connector are detachably connected by a buckle; When the first connector is an elastic band, the other end of the first connector is provided with a male buckle, and the second connector is a female buckle; When the second connector is an elastic band, the other end of the second connector is provided with a male buckle, and the first connector is a female buckle; When both the first connector and the second connector are elastic bands, the other end of the first connector is provided with a male buckle, and the other end of the second connector is provided with a female buckle.
5. The backrest structure according to claim 1, characterized in that, The backrest body has an arc-shaped structure, and the outer side is an outwardly convex surface of the arc-shaped structure. The fixing connection points of the first connector, the second connector and the backrest body are distributed at intervals along the width direction of the backrest body.
6. The backrest structure according to claim 2, characterized in that, The backrest body includes a first fabric layer, a second fabric layer, and a shape-retaining layer. The shape-retaining layer is disposed between the first fabric layer and the second fabric layer and is used to restore the original shape when the backrest body is unfolded.
7. The backrest structure according to claim 6, characterized in that, The conformal layer is made of any one of sponge, thermoplastic polyurethane, or ethylene-vinyl acetate copolymer. The folding guide is a crease line formed by a creasing process. The folding guide forms a crease through the crease line to define the folding path of the backrest body.
8. The backrest structure according to claim 2, characterized in that, The backrest body is made of any one of martensitic stainless steel, spring steel, ABS plastic or PVC plastic. The folding guide is a strip groove opened along the height direction of the backrest body. The folding guide forms a crease through the strip groove to limit the folding path of the backrest body.
9. A foldable handcart, characterized in that, The foldable trolley includes a backrest structure as described in any one of claims 1-8 and a trolley body, wherein the backrest body of the backrest structure is detachably connected to the trolley body.
10. The foldable handcart according to claim 9, characterized in that, The backrest body has a first mounting hole at one end in the width direction, and the number of the first mounting holes is at least one; the backrest body has a second mounting hole at the other end in the width direction, and the number of the second mounting holes is at least one. The first mounting hole and the second mounting hole are respectively used for corresponding fasteners to pass through. Each fastener passes through a corresponding first mounting hole and is threaded to the trolley body to fix one end of the backrest body. Each fastener passes through a corresponding second mounting hole and is threaded to the trolley body to fix the other end of the backrest body.