Double waterproof structure of a draw-bar box

Abstract

The utility model discloses a double waterproof structure draw -bar box, main include upper box body and with upper box body swing connection's lower box body, whole design is around double -sealed waterproof and structural stability development, and the assembly and use convenience are given priority to simultaneously. The upper box body edge is equipped with the first convex edge and second convex edge who projects downward and is annularly arranged, the first convex edge is spaced apart with the second convex edge in the radial direction, and all are around the opening edge of the upper box body and are arranged, and this annular and interval arrangement can ensure the overall coverage to the box opening, avoid the sealing breakpoint, correspondingly, the lower box body edge is equipped with the first recess and second recess who is annularly arranged, the first recess is spaced apart with the second recess in the radial direction, and all are around the opening edge of the lower box body and are arranged, and form the embedded structure of the precise adaptation with the convex edge of the upper box body, and lay the foundation for subsequent sealing waterproof.

Description

Technical Field

[0001] This utility model relates to the field of luggage technology, and in particular to a double waterproof trolley case. Background Technology

[0002] As an essential storage tool for daily travel, the structural design and optimization of practical performance of suitcases have always been the core direction of industry development. In recent years, frameless suitcases have gradually become mainstream products in the market due to their advantages such as simplicity, high space utilization, and lighter weight, and related technologies are constantly being iterated and upgraded. Among them, patent document with patent number CN220631330U, entitled "A Frameless Suitcase for Easy Assembly," optimizes the suitcase splicing structure, eliminating the complex frame components of traditional suitcases, achieving rapid assembly, effectively reducing production processes and manufacturing costs, and providing important technical support for the popularization of frameless suitcases.

[0003] However, while existing frameless suitcases prioritize ease of assembly and a minimalist appearance, their waterproofing design still has significant shortcomings. The core design focus of the aforementioned CN220631330U patent lies in simplifying the assembly structure. Its sealing structure at the opening and closing points typically uses a single sealing strip combined with a mating surface, representing a single-stage sealing design. While this structure provides basic protection in slightly damp everyday environments, in extreme scenarios such as continuous heavy rainfall, water splashes during airport baggage handling, or contact with damp outdoor surfaces, water can easily seep through the gaps at the opening and closing points, leading to seal failure.

[0004] Furthermore, the frameless structure lacks the support and restraint of a traditional frame for the sealing components. With prolonged use or exposure to external forces such as pressure and bumps, the single sealing strip is prone to deformation, displacement, or aging and wear, further reducing waterproof reliability. As users' travel scenarios become more diverse, the requirements for the waterproof performance of suitcases are increasing, especially when carrying moisture-sensitive items such as electronic devices, clothing, and documents. There is an urgent need for a sealing structure that maintains the advantages of the frameless design while achieving a more reliable and durable waterproof effect, thus addressing the problems of insufficient waterproofing layers and poor sealing stability in existing frameless suitcase technologies. Summary of the Invention

[0005] This invention aims to overcome the shortcomings of existing trolley cases in terms of simple waterproof structure and insufficient reliability, and provides a trolley case with a double nested sealing structure to achieve multi-level waterproofing and improve overall waterproof performance.

[0006] To solve the above-mentioned technical problems, this utility model discloses a double waterproof structure trolley case, including an upper case and a lower case movably connected to the upper case. The upper case has a first protruding edge and a second protruding edge that are arranged in a downward ring on its edge. The first protruding edge and the second protruding edge are spaced apart in the radial direction and both surround the opening edge of the upper case. The lower case has a first groove and a second groove arranged in a ring on its edge. The first groove and the second groove are spaced apart in the radial direction and both surround the opening edge of the lower case. The bottom center of the first protruding edge and the bottom center of the second protruding edge are both provided with a circumferentially arranged protruding ring that faces downward. The radial width of the protruding ring is smaller than the radial width of the first protruding edge or the second protruding edge. When the trolley case is closed, the first protruding edge is embedded in the first groove and the second protruding edge is embedded in the second groove, so that the radially outer side and the radially inner side of the protruding edge are respectively sealed and fitted with the groove wall corresponding to the groove. A stepped waterproof cavity is formed between the first protruding edge and the first groove and between the second protruding edge and the second groove.

[0007] The bottom surface of the convex ring is provided with a gap between the bottom of the first groove or the bottom of the second groove, and the gap distance is 0.1mm-1mm.

[0008] The radial cross-sections of the first and second protruding edges are both trapezoidal, and the radial cross-sections of the first and second grooves are both trapezoidal to match the protruding edges. Furthermore, the mating surfaces of the protruding edges and grooves are both arc-shaped transition surfaces.

[0009] The outer or inner radial side of the protruding edge is provided with an annular waterproof strip fixing groove. An elastic waterproof strip is embedded in the waterproof strip fixing groove. The thickness of the elastic waterproof strip is greater than the depth of the waterproof strip fixing groove. When the suitcase is closed, the elastic waterproof strip is squeezed and adhered to the groove wall by the protruding edge.

[0010] It also includes a rotating shaft, with multiple first bushings arranged at intervals extending outward from the outer side of the upper housing, and multiple second bushings arranged at intervals extending outward from the outer side of the lower housing; the multiple first bushings and multiple second bushings are staggered; in the assembled state, the second bushings are coaxially arranged between the two first bushings, and the rotating shaft passes through the first bushings and the second bushings in sequence.

[0011] Both the upper and lower boxes are made of rigid waterproof plastic through one-piece injection molding. The rigid waterproof plastic is one of ABS engineering plastic, PC plastic or PP plastic.

[0012] The lower housing has a recessed mounting groove on its outer side, in which a telescopic pull rod is installed. The pull rod has a mounting hole, and a stud is formed at the bottom of the mounting groove. In the assembled state, the mounting hole and the stud are aligned and fixed by fasteners.

[0013] It also includes caster mounting bases and caster bodies. Caster mounting bases are provided at the bottom of the upper and lower housings. The caster mounting bases are closed structures that do not penetrate the inner cavity of the housing. The caster bodies are detachably mounted on the caster mounting bases by bolts.

[0014] Compared with the prior art, the embodiments of this utility model have the following beneficial effects: (1) By setting a first and second protruding edge that protrudes downward and is distributed in a ring on the edge of the upper box, and cooperating with the corresponding first and second annular grooves on the edge of the lower box, a double-fitting sealing structure is formed. Compared with the traditional single sealing structure, it can build two independent waterproof barriers, greatly improve the overall waterproof capability of the opening and closing of the suitcase, effectively block external water from seeping into the inner cavity from the gap of the box splicing, and better protect the items inside the box from moisture damage.

[0015] (2) The protruding rings provided in the middle of the bottom surface of the first and second protruding edges form a stepped waterproof cavity with the groove when the suitcase is closed. This cavity can extend the water flow penetration path. Even if a small amount of water breaks through the initial sealing surface of the protruding edge and the groove, it will be intercepted and temporarily stored by the cavity and cannot directly enter the inner cavity of the suitcase, further enhancing the waterproof reliability. It is suitable for various humid use scenarios such as continuous rainfall and accidental water splashing.

[0016] (3) The radial outer side and radial inner side of the protrusion are respectively sealed and fitted with the groove wall corresponding to the groove. This double-sided fitting structure not only strengthens the sealing effect, but also increases the structural interlocking depth after the upper and lower boxes are closed, reduces the misalignment of the sealing structure caused by squeezing and bumping during the carrying or transport of the box, and ensures that the stable waterproof performance and structural integrity can still be maintained after long-term use.

[0017] (4) The first convex edge and the second convex edge, the first groove and the second groove are all annular and spaced apart in the radial direction. This ensures that the sealing range covers the entire opening edge of the box without any sealing breaks, and avoids mutual interference between the double waterproof structures. While achieving high-efficiency waterproofing, there is no need to add complex auxiliary sealing components, which simplifies the overall structure of the box and balances waterproof performance with ease of manufacturing and assembly. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the suitcase in the closed state in this embodiment; Figure 2 This is a schematic diagram of the suitcase in the open state in this embodiment; Figure 3 This is a cross-sectional view of the suitcase in the closed state in this embodiment; Figure 4 for Figure 3 Enlarged view of point A in the middle. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] This utility model discloses a specific embodiment of a double waterproof structure trolley case. Please see [link / reference]. Figures 1 to 4The assembly includes an upper housing 1 and a lower housing 2 movably connected to the upper housing 1. Specifically, the movable connection between the upper housing 1 and the lower housing 2 is achieved through a rotating shaft. Specifically, multiple first bushings 11 are arranged at intervals extending outward from the outer side of the upper housing 1, and multiple second bushings 21 are arranged at intervals extending outward from the outer side of the lower housing 2. The multiple first bushings 11 and multiple second bushings 21 are staggered. In the assembled state, the second bushings 21 are coaxially arranged between the two first bushings 11, and the rotating shaft passes through the first bushings 11 and the second bushings 21 in sequence. This staggered bushing structure can distribute the force when the housing is opened and closed, improve the connection stability, and prevent the housing from shaking during the opening and closing process. In other embodiments, the movable connection between the upper housing 1 and the lower housing 2 can also be achieved by replacing it with a hinge. One end of the hinge is fixed to the outer side wall of the upper housing 1 by a screw, and the other end is fixed to the outer side wall of the lower housing 2 by a screw. The installation position of the hinge does not penetrate the inner cavity of the housing, which can also ensure reliable connection and not damage the overall waterproofness of the housing.

[0024] As an improvement, combining Figures 2 to 4 The upper housing 1 has a first protruding edge 51 and a second protruding edge 52 that protrude downwards in a ring shape. The first protruding edge 51 and the second protruding edge 52 are spaced apart in the radial direction and both surround the opening edge of the upper housing 1. This ring-shaped and spaced arrangement can ensure full coverage of the housing opening and avoid sealing breaks. Correspondingly, the lower housing 2 has a first groove 61 and a second groove 62 that are ring-shaped on its edge. The first groove 61 and the second groove 62 are also spaced apart in the radial direction and both surround the opening edge of the lower housing 2, forming a fitting structure that precisely matches the protruding edge of the upper housing 1, laying the foundation for subsequent sealing and waterproofing.

[0025] At the center of the bottom surface of the first protruding edge 51 and at the center of the bottom surface of the second protruding edge 52, there are protruding rings 7 arranged circumferentially downwards. The radial width of the protruding rings 7 is smaller than the radial width of the first protruding edge 51 or the second protruding edge 52.

[0026] When the suitcase is closed, the first protruding edge 51 is embedded in the first groove 61, and the second protruding edge 52 is embedded in the second groove 62. At this time, the radial outer side of the first protruding edge 51 is sealed and fitted with the groove wall on one side of the first groove 61, the radial inner side of the first protruding edge 51 is sealed and fitted with the groove wall on the other side of the first groove 61, the radial outer side of the second protruding edge 52 is sealed and fitted with the groove wall on one side of the second groove 62, and the radial inner side of the second protruding edge 52 is sealed and fitted with the groove wall on the other side of the second groove 62. These four mating surfaces form a four-layer sealing structure, which greatly improves the sealing performance of the suitcase.

[0027] In this embodiment, stepped waterproof cavities 71 are formed between the first protruding edge 51 and the first groove 61, and between the second protruding edge 52 and the second groove 62. A gap of 0.1mm-1mm is provided between the bottom surface of the protruding ring 7 and the bottom of the first groove 61 or the bottom of the second groove 62. This gap not only avoids the box opening and closing jamming caused by direct contact between the protruding ring 7 and the bottom of the groove, but also prevents stress concentration when the structure is squeezed, thus extending the service life of the protruding edge and the groove. More importantly, since the radial width of the protruding ring 7 is smaller than the radial width of the protruding edge, when the trolley case is closed, after the protruding ring 7 is placed into the corresponding groove, water storage cavities are formed on both the radial left and radial right sides of the protruding ring 7. Combined with the gap between the bottom surface of the protruding ring 7 and the bottom of the groove, a labyrinthine waterproof cavity is formed between the protruding edge and the groove. If water wants to seep into the inner cavity of the box, it must detour through the sealing surface and the cavity multiple times, which greatly improves the waterproof performance. Even if a small amount of water breaks through the initial seal, it will be intercepted and temporarily stored by the water storage cavity and the waterproof cavity 71, and cannot contact the items inside the box.

[0028] To further optimize structural adaptability and opening / closing experience, the radial cross-sections of the first protruding edge 51 and the second protruding edge 52 are both trapezoidal, and the radial cross-sections of the first groove 61 and the second groove 62 are both trapezoidal to fit the protruding edges. Furthermore, the contact surfaces of the protruding edges and grooves are both arc-shaped transition surfaces. The trapezoidal cross-section increases the contact area between the protruding edge and the groove, improving sealing stability. The arc-shaped transition surface reduces frictional resistance when the protruding edge is embedded in the groove, making the opening and closing of the housing smoother. It also reduces wear after long-term use, preventing sealing performance degradation due to wear of the contact surfaces. In other embodiments, the radial cross-sections of the first protruding edge 51 and the second protruding edge 52 can also be replaced with rectangles, and the corresponding cross-sections of the first groove 61 and the second groove 62 are also replaced with rectangles. While this still meets basic sealing requirements, the trapezoidal cross-section offers advantages in terms of contact stability and smooth opening / closing.

[0029] As a preferred embodiment, both the upper housing 1 and the lower housing 2 are integrally injection molded from rigid waterproof plastic, which can be one of ABS engineering plastic, PC plastic, or PP plastic. Integral injection molding eliminates seams between housing parts, reducing the risk of water leakage from the source, while also improving the overall structural strength of the housing, giving it good resistance to compression and deformation, making it suitable for various scenarios such as transport and carrying. In other embodiments, the upper housing 1 and the lower housing 2 can also be made by hot pressing with fiber prepreg material. The fibers in the fiber prepreg material can be carbon fiber, which can further reduce the weight of the housing while ensuring structural strength, making it more suitable for use scenarios that prioritize portability.

[0030] In this embodiment, the outer side of the lower housing 2 is provided with a recessed mounting groove 22, and a retractable pull rod 3 is installed in the mounting groove 22. The pull rod 3 has a mounting hole 31, and a stud is formed at the bottom of the mounting groove 22. The stud is not connected to the inner cavity of the housing. In the assembled state, the mounting hole 31 is aligned with the stud and fixed by fasteners (such as screws), which can effectively prevent external water from seeping into the inner cavity of the housing from the mounting point of the pull rod 3.

[0031] In this embodiment, both the bottom of the upper housing 1 and the bottom of the lower housing 2 are provided with caster mounting seats 41 and caster bodies 42. The caster bodies 42 are detachably mounted on the caster mounting seats 41 by bolts. The caster mounting seats 41 are closed structures that do not penetrate the inner cavity of the housing, preventing external water from seeping in from the caster mounting point. The detachable bolt design also facilitates replacement and maintenance after the caster is worn or damaged. In other embodiments, the connection between the caster body 42 and the caster mounting seat 41 can be achieved by replacing it with a snap-fit ​​structure, allowing for tool-free disassembly and installation of the caster, further improving maintenance convenience.

[0032] In other embodiments, the suitcase can further enhance its sealing performance. Specifically, an annular waterproof strip fixing groove is provided on the radially outer or radially inner side of the raised edge. An elastic waterproof strip is embedded in the waterproof strip fixing groove. The thickness of the elastic waterproof strip is greater than the depth of the waterproof strip fixing groove, and when the suitcase is closed, the elastic waterproof strip is pressed and adhered to the groove wall by the raised edge and the groove. The elastic waterproof strip can fill the tiny gaps between the raised edge and the groove caused by manufacturing tolerances. Even if the raised edge or groove experiences slight wear after long-term use, the elastic waterproof strip can maintain the sealing effect through its own elasticity, further enhancing the waterproof reliability of the suitcase.

[0033] The usage process of this double waterproof trolley case is as follows: When using it, first flip the upper case 1 upwards, and rotate the upper case 1 around the connection point with the lower case 2 via the pivot (or hinge). This disengages the first protruding edge 51 and the second protruding edge 52 of the upper case 1 from the first groove 61 and the second groove 62 of the lower case 2. At this point, clothing, electronic devices, documents, and other items can be placed into the inner cavity of the upper case 1 or the lower case 2. After placing the items, flip the upper case 1 downwards, aligning the first protruding edge 51 with the first groove 61 and the second protruding edge 52 with the second groove 62. Slowly press the upper case 1 until the protruding edges are fully embedded in the grooves. At this point, the four mating surfaces of the protruding edges and grooves form a seal, and the convex ring 7 cooperates with the grooves to form a labyrinthine waterproof cavity, completing the case closure. When carrying it, the user can pull the lever 3 in the mounting slot 22 of the lower case 2 according to their needs, and push or pull the case using the casters at the bottom.

[0034] Finally, it should be noted that the double waterproof structure trolley case disclosed in this utility model embodiment is only a preferred embodiment of this utility model and is only used to illustrate the technical solution of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A double waterproof trolley case, comprising an upper case and a lower case movably connected to the upper case, characterized in that: The upper box body has a first protruding edge and a second protruding edge that protrude downwards and are arranged in a ring shape; the first protruding edge and the second protruding edge are spaced apart in the radial direction and both surround the opening edge of the upper box body; The lower housing edge is provided with a first groove and a second groove arranged in a ring shape; the first groove and the second groove are spaced apart in the radial direction and both surround the opening edge of the lower housing. The bottom center of the first convex edge and the bottom center of the second convex edge are both provided with convex rings arranged circumferentially downwards, and the radial width of the convex rings is smaller than the radial width of the first convex edge or the second convex edge. When the suitcase is closed, the first protruding edge is embedded in the first groove, and the second protruding edge is embedded in the second groove, so that the radial outer side and radial inner side of the protruding edge are respectively sealed and fitted with the groove wall corresponding to the groove, and a stepped waterproof cavity is formed between the first protruding edge and the first groove and between the second protruding edge and the second groove.

2. The dual waterproof construction trolley case of claim 1, wherein: A gap is provided between the bottom surface of the convex ring and the bottom of the first groove or the bottom of the second groove, and the gap distance is 0.1mm-1mm.

3. The dual waterproof construction spinner suitcase of claim 1, wherein: The radial cross-sections of the first and second protrusions are both trapezoidal, and the radial cross-sections of the first and second grooves are both trapezoidal to match the protrusions. Furthermore, the mating surfaces of the protrusions and grooves are both arc-shaped transition surfaces.

4. The dual waterproof construction spinner suitcase of claim 1, wherein: An annular waterproof strip fixing groove is provided on the radially outer or radially inner side of the protrusion. An elastic waterproof strip is embedded in the waterproof strip fixing groove. The thickness of the elastic waterproof strip is greater than the depth of the waterproof strip fixing groove. When the suitcase is closed, the elastic waterproof strip is pressed and adhered to the groove wall by the protrusion.

5. The dual waterproof construction spinner suitcase of claim 1, wherein: It also includes a rotating shaft, with multiple first bushings arranged at intervals extending outward from the outer side of the upper housing, and multiple second bushings arranged at intervals extending outward from the outer side of the lower housing; Multiple first bushings and multiple second bushings are staggered; In the assembled state, the second bushing is coaxially disposed between the two first bushings, and the rotating shaft passes through the first bushing and the second bushing in sequence.

6. The dual waterproof construction spinner suitcase of claim 1, wherein: Both the upper and lower housings are integrally injection molded from rigid waterproof plastic, which is one of ABS engineering plastic, PC plastic or PP plastic.

7. The dual waterproof construction spinner suitcase of claim 1, wherein: The outer side of the lower housing is provided with a recessed mounting groove, and a retractable pull rod is installed in the mounting groove; The pull rod has a mounting hole, and a stud is formed at the bottom of the mounting groove. In the assembled state, the mounting hole is aligned with the stud.

8. The dual waterproof construction spinner suitcase of claim 1, wherein: It also includes caster mounting bases and caster bodies. The caster mounting bases are provided at the bottom of both the upper and lower housings. The casters are detachably mounted on the mounting bases by bolts.

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