Sliding mechanism of luggage case

Abstract

The utility model relates to the field of travel equipment, in particular to a sliding mechanism of a luggage case. The specific structure comprises a first upper frame, a second upper frame, a first lower frame and a second lower frame, first sliding rails are arranged between the two sides of the first upper frame and the two sides of the first lower frame respectively, and second sliding rails are arranged between the two sides of the second upper frame and the two sides of the second lower frame respectively. According to the specific improved structure, the side, facing the second side frame, of the first upper frame is aligned with the side, facing the second side frame, of the first lower frame, the first sliding rail is arranged in the space of the other side, away from the second side frame, of the first upper frame, and the side, facing the first side frame, of the second lower frame is aligned with the side, facing the second side frame, of the second upper frame. The second sliding rail is arranged in the space on the other side away from the first side frame. The sliding rail is arranged in the frame, the frame is of an aligned structure, the frame can protect and support the sliding rail, the sliding rail is prevented from being deformed due to external force in the use process, and the use experience and the service life of the product are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of travel equipment, and in particular to a sliding mechanism for a suitcase. Background Technology

[0002] The retractable design concept offers great convenience to travelers, especially when adapting to different travel needs, as the ability to flexibly adjust the size of the suitcase is crucial. However, turning this innovative concept into a practical product has encountered numerous technical bottlenecks, particularly regarding the stability and durability of the structural design.

[0003] Firstly, while the longitudinal or lateral telescopic structural design seems simple and intuitive in theory, ensuring the smooth operation of the sliding rail system is a significant challenge in practice. Traditional sliding rail designs are often based on a fixed-size and shaped suitcase. However, in telescopic suitcases, changes in the suitcase's dimensions directly affect the installation accuracy and stress state of the sliding rail. Even slight deformation of the suitcase during extension or retraction can lead to rail jamming, increased noise, or even damage. This not only affects the user experience but also significantly reduces the product's reliability and lifespan. Examples of longitudinal telescopic structures include Chinese patent CN220800314U (telescopic suitcase), CN210018158U (a variable-capacity suitcase), CN209983642U (telescopic suitcase), and international patent application PCT / IB2020 / 050406 (expandable trolley suitcase). Examples of lateral telescopic structures include Chinese patent CN112806685A (variable-volume suitcase). These structures use a box as a telescopic mechanism or have a telescopic mechanism installed on the box. Deformation of the box during use will affect the smoothness of sliding.

[0004] Secondly, material selection is also a key factor restricting the commercialization of retractable suitcases. Ensuring structural strength during retraction while maintaining lightweight design for easy carrying places extremely high demands on materials. Traditional materials often struggle to simultaneously meet both strength and deformation control standards. While new composite materials can partially solve these problems, their cost and processing difficulty increase accordingly. For example, the CN209931718U multi-functional suitcase, CN209677636U suitcase, and the German patent DE202018106409U1 wheeled suitcase all feature multi-rail structures. These structures place high demands on the materials used in the suitcase body, as any deformation of the body can affect the smoothness of retraction.

[0005] Furthermore, sealing and waterproofing are also crucial considerations in the design of retractable suitcases. Maintaining a tight seal at the opening to prevent rainwater and dust from entering the suitcase as it expands and contracts presents a significant technical challenge. Traditional sealing methods are inadequate for dynamically changing suitcase dimensions, necessitating the development of more flexible and effective sealing mechanisms. Adopting a top-heavy, bottom-light structure can improve sealing and waterproofing to some extent, as exemplified by the retractable suitcase in Chinese patent CN109393695A. Another advantage of this design is its split-opening structure, which greatly enhances usability. However, its drawback lies in placing the sliding rails near the opening of the split-opening structure. Since the opening is a vulnerable area for deformation, and the sliding rails have no external support, deformation remains a concern.

[0006] In addition, ease of use and safety are also factors that must be considered in product design. How to ensure structural complexity while allowing users to easily and safely perform the extension and retraction of the enclosure, avoiding damage or injury caused by misoperation, is a problem that designers need to carefully weigh.

[0007] A more feasible solution is the frame structure and suitcase described in Chinese patent CN210783259U, which integrates the sliding mechanism with the frame into a single unit. Figure 1 As shown, outer frame members 111 and 112 are provided with sliding grooves 113 and 114, and inner frame members 121 and 122 are provided with protrusions 123 and 124. The protrusions 123 and 124 slide within the sliding grooves 113 and 114, achieving a sliding fit between the inner frame members 121 and 122 and the outer frame members 111 and 112. In this design, the frame provides sufficient support for the sliding mechanism, preventing deformation. The drawback of this design is the complex structure of the frame, resulting in high manufacturing costs. More importantly, this structure has a significant flaw: when the inner frame members 121 and 122 slide relative to the outer frame members 111 and 112, increasing the luggage's capacity, the inner frame members 121 and 122 slide out from within the outer frame members 111 and 112, losing their support. As can be seen from the figure, the inner frame members 121 and 122 are separated, with a gap d'. The gap d' will cause the lower box to not be completely sealed, or it will be necessary to use box material for sealing. Even so, the existence of the gap d' will still cause the inner frame parts 121 and 122 to deform differently under external pressure during use.

[0008] In conclusion, although the concept of expandable capacity suitcases has been around for a long time, the technical challenges in structural design, material selection, sealing performance, and user operation have prevented this innovative concept from being widely commercialized. Utility Model Content

[0009] The purpose of this solution is to overcome the shortcomings or defects in the existing technology and provide a sliding mechanism for a luggage that provides stable sliding.

[0010] This plan achieves the above objectives through the following methods.

[0011] This solution provides a sliding mechanism for a suitcase, specifically comprising: a first upper frame, a second upper frame, a first lower frame, and a second lower frame. First slide rails are respectively provided between the two sides of the first upper frame and the two sides of the first lower frame. Second slide rails are respectively provided between the two sides of the second upper frame and the two sides of the second lower frame. The first upper frame and the first lower frame are slidably connected relative to each other via the first slide rails to form a first side frame. The second upper frame and the second lower frame are slidably connected relative to each other via the second slide rails to form a second side frame. The first side frame and the second side frame can be opened and closed relative to each other. A specific improved structure is as follows: the first upper frame and the first lower frame are aligned on the side facing the second side frame, and the first slide rails are disposed in the space on the other side away from the second side frame. The second upper frame and the second lower frame are aligned on the side facing the first side frame, and the second slide rails are disposed in the space on the other side away from the first side frame.

[0012] The sliding mechanism involved in this solution has the slide rail located inside the frame. Since the frame supports the shape of the suitcase and is made of metal or high-strength materials, it is not easily deformed. Therefore, the frame plays a role in supporting and protecting the slide rail, preventing deformation of other parts of the suitcase, such as the suitcase body, from affecting the slide rail during use, and ensuring smooth sliding. On the other hand, the slide rail and frame are independent components. Compared with the existing technology where the slide rail serves as both the frame and the sliding mechanism, the edges of the top and bottom frames remain aligned regardless of how the suitcase is extended or retracted. After the suitcase body is closed, the two side frames can support each other, ensuring that the installation position of the slide rail will not be affected or deformed under the action of external forces, thus ensuring smooth sliding.

[0013] Since the sliding mating housing structure is composed of multiple housing components, there are certain installation errors between these components. These errors can cause changes in the installation accuracy of the slide rails during the opening and closing of the housing. Therefore, this solution further provides a closing positioning mechanism between the first and second upper frame edges, and between the first and second lower frame edges. In the closed state, the closing positioning mechanism restricts the alignment of the first and second slide rails. By using the positioning mechanism on the frame edge, it can be ensured that the first and second slide rails can be aligned horizontally when the housing is closed, thus preventing damage to the slide rails during the sliding of the housing.

[0014] Specifically, the closing positioning mechanism includes wedge-shaped positioning grooves on the first upper and lower frame sides, and wedge-shaped positioning strips on the second upper and lower frame sides. In the closed state, the wedge-shaped positioning strips are embedded in the wedge-shaped positioning grooves. The wedge-shaped positioning grooves and strips, working together, can maximize the tolerance for deformation of the enclosure, making it particularly suitable for non-rigid enclosures, such as those made of fabric or plastic. Even if there is some misalignment when the two sides of the enclosure are opened, the wedge-shaped positioning grooves and strips, during the closing process, can at least pull the two side frames back to their initial positions, thus ensuring the alignment of the slide rails.

[0015] The design can be further improved. The wedge-shaped positioning groove is composed of a first inner inclined surface on the inner side and a second inner inclined surface on the outer side, with the slope of the first inner inclined surface being smaller than that of the second inner inclined surface. The first inner inclined surface faces the receiving space of the box, and the second inner inclined surface faces the outer side of the box, adopting an asymmetrical structure that can simultaneously meet the requirements of accuracy and tolerance. The larger slope of the outer inclined surface ensures alignment of the slide rails when the lid is closed, while the smaller slope of the inner inclined surface ensures smooth locking even if the box undergoes some expansion or contraction deformation.

[0016] Furthermore, the wedge-shaped positioning strip can be further improved, having a first outer bevel and a second outer bevel on the inner side. An opening groove is provided on the second outer bevel, and the opening width D of the opening groove is greater than the edge width d of the outer side of the wedge-shaped positioning groove. One side of the two split-opening boxes is hinged via a pivot mechanism to allow rotation, while the other side is generally equipped with a locking mechanism. On the hinged side, when the two boxes rotate to open, the edges are restricted by the rigid pivot mechanism, causing interference and limiting the opening angle. To increase the relative opening angle of the two boxes, especially to maximize the opening angle to a flat position (180°), an opening groove is provided to avoid the edge of the other box, allowing the edge of the other side's frame to fit into the opening groove after rotation, thereby maximizing the opening angle.

[0017] To improve the overall strength of the enclosure, a reinforcing structure is added based on the above. This solution also includes: a first upper opening frame connected to the first upper frame, a second upper opening frame connected to the second upper frame, a first lower opening frame connected to the first lower frame, and a second lower opening frame connected to the second lower frame. The first and second upper opening frames are located on the same plane, while the first and second lower opening frames are located on another plane. The area enclosed by the first and second upper opening frames is larger than the area enclosed by the first and second lower opening frames. This solution adopts a nested structure where the upper enclosure is larger than the lower enclosure, and an opening frame is provided at the edge of the nesting. This ensures that the interface between the upper and lower enclosures does not deform during relative sliding, guaranteeing smooth sliding.

[0018] Since the upper and lower housings are not sealed, a structure that is wider at the top and narrower at the bottom is adopted. This structure can prevent water or dust from entering the containment space to a certain extent. To further improve the sealing performance, the first and second upper opening frames are provided with inwardly turned flanges. The area enclosed by the flanges is smaller than the area enclosed by the first and second lower opening frames. The flanges can further prevent dust and water from entering the containment space.

[0019] To further improve the stability of the relative sliding of the upper and lower boxes, the first upper opening frame is connected to the end of the first upper frame, the second upper opening frame is connected to the end of the second upper frame, the end of the first lower frame extends beyond the first lower opening frame to form a first extension, and the end of the second lower frame extends beyond the second lower opening frame to form a second extension. The function of the extension is to protect the internal slide rails when the box is adjusted to its maximum capacity, preventing excessive force from directly acting on the slide rails during use. Depending on the capacity of the box, the lengths of the first and second extensions are between 2-15cm, preferably equal in length.

[0020] As described above, the split-type two-sided housing also includes a connecting mechanism connecting the first and second side frames, allowing them to open and close relative to each other. The connecting mechanism includes an upper rotating shaft mechanism connecting the first and second upper side frames and a lower rotating shaft mechanism connecting the first and second lower side frames. The first and second slide rails have a floating fit clearance, and the installation distance Δd between the rotation axes of the upper and lower rotating shaft mechanisms is not greater than the floating fit clearance. Because the upper and lower housings are different sizes, the mounting reference planes of the upper and lower rotating shaft mechanisms cannot be the same plane. This results in the upper and lower housings not rotating coaxially during opening and closing. Although the axis positions of the upper and lower rotating shaft mechanisms are not significantly different—generally just the difference between the upper and lower housings, i.e., the thickness of the side walls—the rotating shaft mechanism is a precision-fitted component. After repeated use, the non-coaxial rotation will cause some deformation. Therefore, this solution sets a floating fit gap on the first slide rail and the second slide rail, which allows the upper and lower frames of the housing to be non-tightly fitted during the opening and closing process, so that they do not restrict each other. This will not bring internal compressive stress to the non-coaxial rotation and ensure the service life of the rotating shaft mechanism.

[0021] The advantages of this solution are that the slide rail is located within the frame, and the frame adopts an aligned structure. The frame provides protection and support for the slide rail, preventing deformation due to external forces during use and ensuring a good user experience and product lifespan. Through floating clearance fit and the coordination of the positioning mechanism, the cabinet has a certain tolerance during relative sliding and opening, and high alignment accuracy after closing. The fitting accuracy between various components can be switched according to different usage scenarios. Further strengthening the frame's strength and sealing performance reduces the requirements for cabinet materials, allowing for a wider range of material choices and product diversification. In summary, these advantages of this solution compared to existing technologies enable its productization and industrialization. Products manufactured based on this solution will not increase costs and possess a competitive advantage. Attached Figure Description

[0022] Figure 1 This is a diagram illustrating the background technology structure.

[0023] Figure 2 This is a schematic diagram of the structure of an embodiment.

[0024] Figure 3 for Figure 2 Structural assembly diagram.

[0025] Figure 4 This is a schematic diagram of the sliding mechanism in the embodiment.

[0026] Figure 5 for Figure 2 A schematic diagram of the structure in its unfolded state.

[0027] Figure 6 for Figure 5 A first-person view of the structural assembly diagram.

[0028] Figure 7 for Figure 5 The second-view structural assembly diagram.

[0029] Figure 8 for Figure 4 The structure explodes.

[0030] Figure 9 for Figure 2 A longitudinal sectional view of the front view.

[0031] Figure 10 for Figure 9 A cross-sectional view of plane AA.

[0032] Figure 11 for Figure 10 A magnified view of part I.

[0033] Figure 12 for Figure 10A magnified view of part II.

[0034] Figure 13 for Figure 2 A schematic diagram of the horizontal section of the front view.

[0035] Figure 14 for Figure 13 A cross-sectional view of the BB plane.

[0036] Figure 15 for Figure 14 A magnified view of a section of section III.

[0037] Figure 16 for Figure 14 A magnified view of a portion of IV.

[0038] Figure 17 This is a schematic diagram of the wedge-shaped positioning groove.

[0039] Figure 18 This is a schematic diagram of the wedge-shaped positioning strip.

[0040] Figure 19 This is a structural view of the rotational fit between the wedge-shaped positioning groove and the wedge-shaped positioning strip.

[0041] Figure 20 This is a schematic diagram showing the alignment of the wedge-shaped positioning grooves of the first upper border and the first lower border.

[0042] Figure 21 This is a schematic diagram showing the alignment of the wedge-shaped positioning strips of the second upper border and the second lower border.

[0043] Figure 22 This is a schematic diagram of the slide rail structure.

[0044] Figure 23 for Figure 2 Another perspective diagram.

[0045] Figure 24 for Figure 23 A schematic diagram of the horizontal section of the front view.

[0046] Figure 25 for Figure 24 A cross-sectional view of the C-plane.

[0047] Figure 26 for Figure 25 A magnified view of a portion of the V-shape. Detailed Implementation

[0048] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0049] like Figure 2 The embodiment of this utility model shown is specifically a suitcase with expandable capacity. As can be seen from the figure, the suitcase includes an upper body 100 and a lower body 200. The upper body 100 and the lower body 200 can be slidably installed relative to each other vertically, and can be fixed in a specific position to adjust the internal storage space of the suitcase. Further combined with... Figure 3 As can be seen, the upper housing 100 includes a first upper shell 110 and a second upper shell 120, and the lower housing 200 includes a first lower shell 210 and a second lower shell 220. The first upper shell 110 has a first upper frame 310 at its opening edge, the second upper shell 120 has a second upper frame 320 at its opening edge, the first lower shell 210 has a first lower frame 330 at its opening edge, and the second lower shell 220 has a second lower frame 340 at its opening edge.

[0050] along Figure 2 The upper housing 100 and the lower housing 200 shown slide relative to each other in the direction shown. The sliding mechanism alone is as follows: Figure 4 As shown, a first slide rail 410 is provided between the first upper frame 310 and the first lower frame 330, and a second slide rail 420 is provided between the second upper frame 320 and the second lower frame 340. Further combined... Figure 5 , Figure 6 and Figure 7 As can be seen, the first upper shell 110 and the first lower shell 210 are slidably connected relative to each other via the first slide rails 410 on both sides to form a first side box 510, and the second upper shell 120 and the second lower shell 220 are slidably connected relative to each other via the second slide rails 420 on both sides to form a second side box 520. The first side box 510 and the second side box 520 are connected on one side by a connecting mechanism 600 to form a relatively rotatable whole, and the other side can be opened and closed relative to each other, so that the first side box 510 and the second side box 520 have an unfolded state and a closed state. Figure 2 As shown, in the closed state, the two side boxes are locked by the locking mechanism, and the interior of the first side box 510 and the second side box 520 forms a storage space.

[0051] The specific composition of the sliding mechanism Figure 4 and Figure 8As shown, a first upper opening frame 910 and a first lower opening frame 930 are provided on the mating side of the first upper housing 110 and the first lower housing 210, and a second upper opening frame 920 and a second lower opening frame 940 are provided on the mating side of the second upper housing 120 and the second lower housing 220. The first upper opening frame 910 is connected to the first upper frame 310, the second upper opening frame 920 is connected to the second upper frame 320, the first lower opening frame 930 is connected to the first lower frame 330, and the second lower opening frame 940 is connected to the second lower frame 340. The first lower frame 330 extends beyond the first lower housing 210 and the first lower opening frame 930 to form a first extension section 331 facing the upper housing 100, and the second lower frame 340 extends beyond the second lower housing 220 and the second lower opening frame 940 to form a second extension section 341 facing the upper housing 100. The lengths of the first extension section 331 and the second extension section 341 are between 2 and 15 cm.

[0052] from Figure 9 and Figure 10 It can be seen that the cross-sectional area of ​​the upper box 100 is larger than that of the lower box 200, and it is slidably installed on the lower box 200. The area enclosed by the first upper opening frame 910 and the second upper opening frame 920 is larger than the area enclosed by the first lower opening frame 930 and the second lower opening frame 940. Figure 11 and Figure 12 The first lower opening frame 930 and the second lower opening frame 940 protrude from the surfaces of the first lower housing 210 and the second lower housing 220. The first upper opening frame 910 and the second upper opening frame 920 are provided with flanges 911 and 921 facing the first lower housing 210 and the second lower housing 220.

[0053] from Figure 13 and Figure 14 As can be seen, a closing positioning mechanism 700 is provided between the first upper frame 310 and the second upper frame 320, and between the first lower frame 330 and the second lower frame 340. In the closed state, the closing positioning mechanism 700 restricts the alignment of the first slide rail 410 and the second slide rail 420. The closing positioning mechanism 700 is specifically as follows... Figure 15 and 16 As shown, the structure includes wedge-shaped positioning grooves 710 disposed on the first upper frame 310 and the first lower frame 330, and wedge-shaped positioning strips 720 disposed on the second upper frame 320 and the second lower frame 340. In the closed state, the wedge-shaped positioning strips 720 are embedded in the wedge-shaped positioning grooves 710. Further detailed structural references are available. Figure 17 and Figure 18The wedge-shaped positioning groove 710 is composed of a first inner inclined surface 711 near the storage space and a second inner inclined surface 712 away from the storage space. The slope of the first inner inclined surface 711 is less than that of the second inner inclined surface 712, i.e., the inclination angle α1 is less than α2. The wedge-shaped positioning strip 720 has a first outer inclined surface 721 near the storage space and a second outer inclined surface 722 away from the storage space. The second outer inclined surface 722 is provided with an opening groove 723. The opening width D of the opening groove 723 is greater than the edge width d of the wedge-shaped positioning groove 710 on the side away from the storage space. In this way, during the rotation of the connecting mechanism 600 of the suitcase, the wedge-shaped positioning strip 720 and the wedge-shaped positioning groove 710 will not interfere, as shown in Figure 19.

[0054] Compared to the prior art, one important improvement of this embodiment is as follows: Figure 20 and 21 As shown, the first upper frame 310 and the first lower frame 330 are aligned on the side facing the second side housing 520, and the first slide rail 410 is disposed in the space on the other side away from the second side housing 520, that is, the wedge-shaped positioning grooves 710 are aligned. The second upper frame 320 and the second lower frame 340 are aligned on the side facing the first side housing 510, and the second slide rail 420 is disposed in the space on the other side away from the first side housing 510, that is, the wedge-shaped positioning strips 720 are aligned. In this way, no matter which position the upper housing 100 and the lower housing 200 slide to, in the closed state, the fitting precision between the wedge-shaped positioning grooves 710 and the wedge-shaped positioning strips 720 remains unchanged, and they can support each other, thereby ensuring that the sliding of the first slide rail 410 and the second slide rail 420 is not affected.

[0055] On a plane perpendicular to the relative sliding direction of the housing 100 and the lower housing 200, the first slide rail 410 and the second slide rail 420 have a floating fit clearance 800, the floating range Δ of which is between 0.1mm and 2mm. Specifically, as shown... Figure 22 As shown, both the first slide rail 410 and the second slide rail 420 are composed of nested inner slide rails 430 and outer slide rails 440. The inner slide rail 430 is restricted to slide within the outer slide rail 440. In the plane perpendicular to the sliding direction, the outer slide rail 440 and the inner slide rail 430 have a mating gap Δ1 in the transverse direction and a mating gap Δ2 in the longitudinal direction. The mutually perpendicular mating gaps Δ1 and Δ2 together constitute the floating mating gap 800.

[0056] The purpose of setting up a floating slide rail is as follows: Figure 23 and 24As shown, the connecting mechanism 600 includes an upper rotating shaft mechanism 610 connecting the first upper housing 110 and the second upper housing 120, and a lower rotating shaft mechanism 620 connecting the first lower housing 210 and the second lower housing 220. Since the cross-sectional area of ​​the upper housing 100 is larger than that of the lower housing 200, forming a nested structure, the upper rotating shaft mechanism 610 and the lower rotating shaft mechanism 620 are not mounted on the same support surface. Figure 25 and Figure 26 It can be seen that the support surfaces of the two mechanisms have a height difference Δd. Therefore, the installation distance Δd between the rotation axes of the upper rotating shaft mechanism 610 and the lower rotating shaft mechanism 620 must not be greater than the floating fit clearance 800. Only by meeting this adjustment can it be ensured that the upper rotating shaft mechanism 610 and the lower rotating shaft mechanism 620 will not be damaged or have their service life reduced due to internal stress during the opening and closing of the suitcase.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A sliding mechanism for a suitcase, comprising: First top border (310), second top border (320), first bottom border (330), and second bottom border (340). First slide rails (410) are respectively provided between the two sides of the first upper frame (310) and the two sides of the first lower frame (330). A second slide rail (420) is provided between the two sides of the second upper frame (320) and the two sides of the second lower frame (340). The first upper frame (310) and the first lower frame (330) are slidably connected relative to each other via the first slide rail (410) to form the first side frame (511). The second upper frame (320) and the second lower frame (340) are slidably connected relative to each other via the second slide rail (420) to form the second side frame (521). The first side frame (511) and the second side frame (521) are openable and closable relative to each other, characterized in that... The first upper frame (310) and the first lower frame (330) are aligned on the side facing the second side frame (521), and the first slide rail (410) is disposed in the space on the other side away from the second side frame (521). The second upper frame (320) and the second lower frame (340) are aligned on the side facing the first side frame (511), and the second slide rail (420) is disposed in the space on the other side away from the first side frame (511).

2. The sliding mechanism of a suitcase according to claim 1, characterized in that, A closing positioning mechanism (700) is provided between the first upper frame (310) and the second upper frame (320), and between the first lower frame (330) and the second lower frame (340). In the closed state, the closing positioning mechanism (700) restricts the alignment of the first slide rail (410) and the second slide rail (420).

3. The sliding mechanism of a suitcase according to claim 2, characterized in that, The closing positioning mechanism (700) includes a wedge-shaped positioning groove (710) disposed on the first upper frame (310) and the first lower frame (330), and a wedge-shaped positioning strip (720) disposed on the second upper frame (320) and the second lower frame (340). In the closed state, the wedge-shaped positioning strip (720) is embedded in the wedge-shaped positioning groove (710).

4. The sliding mechanism of a suitcase according to claim 3, characterized in that, The wedge-shaped positioning groove (710) is composed of an inner first inclined surface (711) on the inside and a second inner inclined surface (712) on the outside, wherein the slope of the first inner inclined surface (711) is less than that of the second inner inclined surface (712).

5. The sliding mechanism for a suitcase according to claim 3, characterized in that, The wedge-shaped positioning strip (720) has a first outer inclined surface (721) on the outer side and a second outer inclined surface (722) on the inner side. The second outer inclined surface (722) is provided with an opening groove (723). The opening width D of the opening groove (723) is greater than the edge width d of the outer side of the wedge-shaped positioning groove (710).

6. A sliding mechanism for a suitcase according to any one of claims 1-5, characterized in that, Also includes: The first upper opening frame (910) is connected to the first upper frame (310). The second upper opening frame (920) is connected to the second upper frame (320). The first lower opening frame (930) connected to the first lower border (330), and The second lower opening frame (940) is connected to the second lower border (340). The first upper opening frame (910) and the second upper opening frame (920) are located on the same plane, while the first lower opening frame (930) and the second lower opening frame (940) are located on another plane. The area enclosed by the first upper open frame (910) and the second upper open frame (920) is larger than the area enclosed by the first lower open frame (930) and the second lower open frame (940).

7. The sliding mechanism of a suitcase according to claim 6, characterized in that, The first upper opening frame (910) and the second upper opening frame (920) are provided with inward flanges (911, 921), and the area enclosed by the flanges (911, 921) is smaller than the area enclosed by the first lower opening frame (930) and the second lower opening frame (940).

8. The sliding mechanism of a suitcase according to claim 6, characterized in that, The first upper opening frame (910) is connected to the end of the first upper frame (310). The second upper opening frame (920) is connected to the end of the second upper frame (320). The end of the first lower frame (330) extends beyond the first lower opening frame (930) to form a first extension segment (331). The end of the second lower frame (340) extends beyond the second lower opening frame (940) to form a second extension (341).

9. A sliding mechanism for a suitcase according to claim 8, characterized in that, The lengths of the first extension segment (331) and the second extension segment (341) are between 2 and 15 cm.

10. A sliding mechanism for a suitcase according to any one of claims 1-5, characterized in that, It also includes a connecting mechanism connecting the first side frame (511) and the second side frame (521) so that the two can be opened and closed relative to each other. The connecting mechanism (600) includes an upper rotating shaft mechanism (610) connecting the first upper frame (310) and the second upper frame (320) and a lower rotating shaft mechanism (620) connecting the first lower frame (330) and the second lower frame (340). The first slide rail (410) and the second slide rail (420) have a floating fit gap (800). The installation distance Δd between the rotation axes of the upper rotating shaft mechanism (610) and the lower rotating shaft mechanism (620) is not greater than the floating fit gap (800).

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