Telescopic luggage case with locking mechanism

Abstract

The utility model relates to the field of travel equipment, in particular to a telescopic luggage case with a locking mechanism. The concrete structure comprises an upper box body and a lower box body, the upper box body and the lower box body are installed in a relative sliding mode, an upper telescopic frame is arranged in the upper box body, one end of the upper telescopic frame is connected with the upper bottom face of the upper box body, a lower telescopic frame is arranged in the lower box body, and one end of the lower telescopic frame is connected with the lower bottom face of the lower box body. The other end of the upper telescopic frame and the other end of the lower telescopic frame are matched with each other to stretch out and draw back in a sliding mode, and a locking mechanism is arranged and used for locking the upper telescopic frame and the lower telescopic frame at one or more opposite positions. According to the scheme, the independent telescopic frame is arranged, and the locking mechanism is arranged on the telescopic frame, so that the capacity of the telescopic luggage case is adjusted and locked. The upper and lower telescopic frames are respectively connected with the upper and lower luggage cases, can also be used as auxiliary supports of the sliding frames, and play a role in reinforcing the whole structure of the case body.

Description

Technical Field

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

[0002] Expandable-capacity suitcases have showcased various possibilities in conceptual design. For example, vertical expansion can be achieved by increasing or decreasing the height of internal compartments, while lateral expansion might be accomplished through side extension panels or folding mechanisms. However, these designs have encountered numerous obstacles in practical application. On the one hand, complex mechanical structures often mean higher production costs and maintenance difficulties; on the other hand, structural stability and durability have become pressing issues. For instance, a typical expandable-capacity suitcase requires a locking mechanism to secure it to a specific capacity, preventing unauthorized expansion or contraction. In existing technologies, the locking mechanism can be optionally located on three basic structural elements: the suitcase body, the frame, and the sliding rails. However, in practice, none of these three locations are suitable.

[0003] As a key component ensuring stable operation of a suitcase within a specific capacity, the locking mechanism also faces numerous design challenges. While placing the locking mechanism on the suitcase body seems straightforward, long-term use and stress on the body material (such as plastic or lightweight metal) can cause slight deformation, affecting the accuracy and reliability of the locking mechanism. Body deformation can also cause lock misalignment, making opening and closing difficult. Solutions such as those demonstrated in Chinese patents CN220800314U (retractable suitcase), CN210018158U (a variable capacity suitcase), CN209983642U (retractable suitcase), and international patent application PCT / IB2020 / 050406 are relevant.

[0004] While locking mechanisms on the frame can theoretically reduce reliance on the strength of the case material, the frame itself, as a key component connecting the case and the sliding rails, is crucial for strength and stability. Adding a locking mechanism to the frame may weaken its structural integrity, especially under heavy loads or accidental impacts, potentially leading to deformation or even breakage. Solutions illustrated in Chinese patents CN109393695A (retractable trolley case) and CN210783259U (frame structure and luggage) demonstrate this approach.

[0005] As for the locking mechanism on the sliding rail, while it facilitates control of the extension and retraction movements, it often affects the smoothness and fluidity of the sliding action. The additional locking mechanism increases friction on the rail, requiring users to exert more force when adjusting the luggage compartment's capacity, and may also accelerate rail wear, shortening its lifespan. Utility Model Content

[0006] The purpose of this solution is to overcome the shortcomings or defects in the existing technology and provide a retractable suitcase with a locking mechanism.

[0007] This plan achieves the above objectives through the following methods.

[0008] This solution provides a retractable suitcase with a locking mechanism, including an upper body and a lower body, which are slidably installed relative to each other. The specific improved structure is as follows: an upper telescopic frame is provided inside the upper body, one end of which is connected to the upper bottom surface of the upper body; a lower telescopic frame is provided inside the lower body, one end of which is connected to the lower bottom surface of the lower body; the other ends of the upper and lower telescopic frames cooperate with each other to slide and extend, and a locking mechanism is provided to lock the upper and lower telescopic frames in one or more relative positions. As described in the background art, locking mechanisms located on the suitcase body, slide rails, or frame all have their drawbacks. Therefore, this solution uses an independent telescopic frame, and the locking mechanism is located on the telescopic frame to achieve capacity adjustment and locking of the retractable suitcase. The upper and lower telescopic frames are connected to the upper and lower suitcases respectively, and also serve as auxiliary supports for the sliding frame, strengthening the overall structure of the suitcase.

[0009] The specific structure is as follows: The lower telescopic frame includes two parallel sleeves and a base. One end of each sleeve is connected to the base, and the base is fixed to the bottom surface of the lower compartment. The upper telescopic frame includes two parallel core tubes. One end of each core tube is connected to the top surface of the upper compartment, and the other end is inserted into the sleeve and slides relative to it. The locking mechanism includes a locking end, a trigger end, and a linkage mechanism. The locking end is located between the core tube and the sleeve, and the trigger end is located on the base. The trigger end, through the linkage mechanism, drives the locking end to lock or unlock the relative position between the core tube and the sleeve. The linkage mechanism allows the trigger end to be positioned away from the locking end, enabling flexible placement of the trigger end to better suit the user's needs in the suitcase design.

[0010] The further specific structure is as follows: the base portion is exposed on the outside of the lower housing; the trigger end is a winding wheel located on the outside of the lower housing of the base; the linkage mechanism consists of two steel wire ropes connected at one end to the winding wheel and pulled by the winding wheel. The two steel wire ropes extend from one end to the other along two sleeves, respectively, and are connected to two locking ends located at the other ends of the two sleeves. Pulling the locking ends locks or unlocks the relative position between the core tube and the sleeves. The advantage of using steel wire ropes is that, compared to rigid linkage mechanisms, steel wire ropes are simpler and have higher reliability. The winding wheel, through a pair of steel wire ropes, can simultaneously drive the two locking ends, achieving synchronous locking or unlocking. The synchronized locking ends further ensure the locking stability between the upper and lower telescopic frames, providing a better user experience.

[0011] Since the wire rope can only achieve unidirectional pulling action, it is designed with an active rope pull unlocking and a passive rope pull locking method. The specific structure is as follows: the locking end includes a floating seat, a sliding seat, a lock cylinder, and a spring. The lock cylinder is mounted on the floating seat, and the spring is installed between the floating seat and the sleeve, pushing the floating seat to move the lock cylinder towards the core tube. The core tube has a lock hole that engages with the lock cylinder. The sliding seat is located between the floating seat and the core tube, connected to the other end of the wire rope. The sliding seat and the floating seat are in a beveled fit. The wire rope pulls the sliding seat, which, through the beveled fit, supports the floating seat to overcome the spring thrust and move away from the core tube, causing the lock cylinder to disengage from the lock hole. The core tube has a pusher that pushes the sliding seat in the opposite direction of the wire rope pulling the sliding seat, so that the floating seat, under the spring thrust, engages the lock cylinder with the lock hole.

[0012] The telescopic frame in this design is arranged vertically. To make the structural design more rational, it is further integrated with the telescopic pull rod of the suitcase. The specific structure is as follows: one end of the core tube is connected to the upper bottom surface of the suitcase body through a handle seat. The handle seat is partially exposed on the outside of the upper suitcase body. It also includes a handle connecting two telescopic pull rods. The two telescopic pull rods pass through the handle seat and are slidably inserted into the core tube. A positioning device is provided to lock the relative position between the telescopic pull rods and the core tube.

[0013] The specific structure of the suitcase is as follows: the upper body includes a first upper shell and a second upper shell, and the lower body includes a first lower shell and a second lower shell. The first upper shell has a first upper frame at its opening edge, the second upper shell has a second upper frame at its opening edge, the first lower shell has a first lower frame at its opening edge, and the second lower shell has a second lower frame at its opening edge. A first slide rail is provided between the first upper frame and the first lower frame along the direction in which the upper and lower bodies slide relative to each other, and a second slide rail is provided between the second upper frame and the second lower frame. The first upper shell and the first lower shell are slidably connected relative to each other via the first slide rail to form a first side body. The outer shell and the second lower shell are slidably connected to each other via a second slide rail to form a second side box. The first side box and the second side box are connected by a connecting mechanism to form a rotatable whole. The other side is opened and closed so that the first side box and the second side box have an unfolded state and a closed state. In the closed state, the interior of the first side box and the second side box forms a storage space. The first upper frame and the first lower frame are aligned on the side facing the second side box. The first slide rail is set in the space on the other side away from the second side box. The second upper frame and the second lower frame are aligned on the side facing the first side box. The second slide rail is set in the space on the other side away from the first side box.

[0014] 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 upper and lower 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 is not affected by external forces and that the slide rail is not deformed, thus ensuring smooth sliding. Furthermore, when the sliding ability of the slide rail is not affected by the suitcase body and its materials, the selection of shell materials constituting the suitcase body is expanded. For example, fabric, plastic, or thin metal can be used. In traditional telescopic suitcases, these materials are not recommended due to their susceptibility to deformation. One side of the two boxes can be connected to form a rotatable whole by a rotating mechanism or flexible sheet, while the other side can be equipped with a locking mechanism or sealed using traditional structures such as zippers.

[0015] During use, the housing inevitably undergoes some deformation, such as from collisions during transportation, loading heavy objects, or uneven filling. Therefore, using precision-fitted slide rails would be insufficient to meet these requirements, as even slight deformation could prevent smooth sliding. Thus, as a preferred solution, the first and second slide rails have a floating fit clearance on a plane perpendicular to the relative sliding direction of the housing and lower housing. The floating range Δ of this clearance is between 0.1mm and 2mm. Unlike traditional product designs that prioritize precision fit, this floating fit clearance not only protects the slide rails and extends their lifespan but also allows for a reduction in the assembly precision requirements of other structures, resulting in better industrial feasibility. Although the clearance fit may slightly degrade the user experience, when both housings are in the closed rotation state, the housing and slide rails are restricted by the closed positioning mechanism of the frame. The relative sliding between the wedge-shaped positioning groove and the wedge-shaped positioning strip compensates for the reduced user experience caused by the clearance fit, thus balancing factors such as product lifespan, production efficiency, yield, and user experience.

[0016] 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 housings and a lower rotating shaft mechanism connecting the first and second lower housings. 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 of 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 housing sidewalls—the rotating shaft mechanism is a precision-fitted component. After repeated use, non-coaxial rotation will cause some deformation. Therefore, this solution sets a floating fit clearance on the first and second slide rails. This allows the upper and lower frames to be non-tightly fitted during opening and closing, without mutually restricting each other. This prevents internal compressive stress on the non-coaxial rotation, ensuring the service life of the rotating shaft mechanism.

[0017] To further improve the stability of the relative sliding of the upper and lower housings, the first lower frame extends beyond the first lower housing to form a first extension section facing the upper housing, and the second lower frame extends beyond the second lower housing to form a second extension section facing the upper housing. The function of the extension sections is to protect the internal slide rails when the housing is adjusted to its maximum capacity, preventing excessive forces from directly acting on the slide rails during use. Depending on the capacity of the housing, the lengths of the first and second extension sections are between 2-15 cm, preferably equal in length.

[0018] The advantages of this solution are that it uses an independent telescopic bracket to lock the telescopic suitcase, overcoming the problem of unreasonable locking mechanism placement in existing technologies, and further enhancing the strength of the telescopic suitcase. In addition, this solution can be integrated with existing suitcase telescopic handles without occupying any luggage space. In summary, these advantages of this solution compared to existing technologies enable its productization and industrialization. Products made based on this solution will not increase costs and will have a competitive advantage. Attached Figure Description

[0019] Figure 1 This is a structural diagram of an embodiment.

[0020] Figure 2 for Figure 1 Internal structure diagram.

[0021] Figure 3 This is a structural diagram of one side of the suitcase.

[0022] Figure 4 for Figure 3 A structural diagram from another angle.

[0023] Figure 5 This is a schematic diagram of the structure of the core tube and the sleeve.

[0024] Figure 6 for Figure 5 A magnified view of part I.

[0025] Figure 7 for Figure 6 The structure explodes.

[0026] Figure 8 This is a schematic diagram of the locking action at the locking end.

[0027] Figure 9 This is a diagram illustrating the unlocking action of the locked end.

[0028] Figure 10 This is a schematic diagram of the telescopic handle structure of a suitcase.

[0029] Figure 11 for Figure 1 Structural assembly diagram.

[0030] Figure 12 This is a schematic diagram of the sliding mechanism in the embodiment.

[0031] Figure 13 for Figure 1 A schematic diagram of the structure in its unfolded state.

[0032] Figure 14 for Figure 13 A first-person view of the structural assembly diagram.

[0033] Figure 15 for Figure 13 The second-view structural assembly diagram.

[0034] Figure 16 for Figure 12 The structure explodes.

[0035] Figure 17 This is a diagram illustrating the alignment of the first top border with the first bottom border.

[0036] Figure 18 This is a diagram illustrating the alignment of the second top border with the second bottom border.

[0037] Figure 19 This is a schematic diagram of the slide rail structure.

[0038] Figure 20 for Figure 1 Another perspective diagram.

[0039] Figure 21 for Figure 20A schematic diagram of the horizontal section of the front view.

[0040] Figure 22 for Figure 21 A cross-sectional view of the C-plane.

[0041] Figure 23 for Figure 21 A magnified view of a portion of the V-shape. Detailed Implementation

[0042] 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.

[0043] like Figure 1 As shown in one embodiment of the present invention, a retractable suitcase with a locking mechanism includes an upper body 100 and a lower body 200. The upper body 100 and the lower body 200 are slidably mounted relative to each other. The relative position between the upper body 100 and the lower body 200 can be locked and unlocked to facilitate adjustment of the internal storage space of the suitcase. Figure 2 As can be seen, the upper compartment 100 is provided with an upper telescopic frame 131, one end of which is connected to the upper bottom surface of the upper compartment 100. The lower compartment 200 is provided with a lower telescopic frame 132, one end of which is connected to the lower bottom surface of the lower compartment 200. The other ends of the upper telescopic frame 131 and the lower telescopic frame 132 cooperate with each other to slide and extend, and a locking mechanism 140 is provided to lock the upper telescopic frame 131 and the lower telescopic frame 132 in one or more relative positions. By supporting the upper compartment 100 and the lower compartment 200 with the upper telescopic frame 131 and the lower telescopic frame 132, the relative positions of the two are locked in a specific position, thereby realizing the adjustment of the luggage's storage space.

[0044] The specific structure can be seen from Figure 3 and Figure 4Further understanding reveals that the lower telescopic frame 132 includes two parallel sleeves 133 and a base 134. One end of the sleeve 133 is connected to the base 134, and the base 134 is fixed to the lower bottom surface of the lower housing 200. The upper telescopic frame 131 includes two parallel core tubes 135. One end of the core tube 135 is connected to the upper bottom surface of the upper housing 100, and the other end is inserted into the sleeve 133 for relative sliding. The locking mechanism 140 includes a locking end 141, a trigger end 142, and a linkage mechanism 143. The locking end 141 is located between the core tube 135 and the sleeve 133, and the trigger end 142 is located on the base 134. The trigger end 142 drives the locking end 141 to lock or unlock the relative position between the core tube 135 and the sleeve (133) through the linkage mechanism 143.

[0045] Combination Figure 4 and Figure 5 As can be seen, the base 134 is partially exposed outside the lower housing 200. The trigger end 142 is a winding wheel located on the base 134 facing the outside of the lower housing 200. The linkage mechanism 143 consists of two steel wire ropes connected at one end to the winding wheel and pulled by the winding wheel. The two steel wire ropes extend from one end to the other end along the two sleeves 133 respectively and are connected to two locking ends 141 located at the other end of the two sleeves 133. Pulling the locking ends 141 locks or unlocks the relative position between the core tube 135 and the sleeve 133.

[0046] from Figure 6 and Figure 7 As can be seen, the locking end 141 includes a floating seat 151, a sliding seat 152, a lock cylinder 153, and a spring 154. The lock cylinder 153 is mounted on the floating seat 151, and the spring 154 is mounted between the floating seat 151 and the sleeve 133, pushing the floating seat 151 to move the lock cylinder 153 toward the core tube 135. The core tube 135 has a lock hole 155 that engages with the lock cylinder 153. The sliding seat 152 is located between the floating seat 151 and the core tube 135 and is connected to the other end of the wire rope. The sliding seat 152 and the floating seat 151 are in a beveled fit. The wire rope pulls the sliding seat 152, which, through the beveled fit, supports the floating seat 151 to overcome the thrust of the spring 154 and move away from the core tube 135, causing the lock cylinder 153 to disengage from the lock hole 155. Figure 9 As shown. A pusher 156 is provided on the core tube 135 to push the sliding seat 152 in the opposite direction to the pull of the wire rope, so that the floating seat 151, under the thrust of the spring 154, drives the lock cylinder 153 to engage with the lock hole 155, as shown. Figure 8 As shown.

[0047] like Figure 10As shown, one end of the core tube 135 is connected to the upper bottom surface of the upper housing 100 through a handle seat 161. The handle seat 161 is partially exposed on the outside of the upper housing 100. It also includes a handle 162 connecting two telescopic rods 163. The two telescopic rods 163 pass through the handle seat 161 and are slidably inserted into the core tube 135 respectively. A positioning device is provided to lock the relative position between the telescopic rods 163 and the core tube 135.

[0048] from Figure 1 As can be seen, 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 integration... Figure 11 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.

[0049] along Figure 1 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 12 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 13 , Figure 14 and Figure 15 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 1 As shown, in the closed state, the two side boxes are locked by a fastening and locking mechanism on one side, and a storage space is formed inside the first side box 510 and the second side box 520.

[0050] The specific composition of the sliding mechanism Figure 12 and Figure 16As 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.

[0051] 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. An important improvement of this embodiment compared to the prior art is as follows: Figure 17 and 18 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. 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. In this way, no matter which position the upper housing 100 and the lower housing 200 slide to, in the closed state, the fit precision between the wedge-shaped positioning groove and the wedge-shaped positioning strip of the frame 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.

[0052] 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 19 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.

[0053] The purpose of setting up a floating slide rail is as follows: Figure 20 and 21 As 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 22 and Figure 23 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.

[0054] 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 retractable suitcase with a locking mechanism, comprising an upper body (100) and a lower body (200), wherein the upper body (100) and the lower body (200) are slidably mounted relative to each other; characterized in that, The upper housing (100) is provided with an upper telescopic frame (131), one end of which is connected to the bottom surface of the upper housing (100). The lower housing (200) is equipped with a lower telescopic frame (132), one end of which is connected to the bottom surface of the lower housing (200). The other end of the upper telescopic frame (131) and the other end of the lower telescopic frame (132) cooperate to slide and extend, and a locking mechanism (140) is provided to lock the upper telescopic frame (131) and the lower telescopic frame (132) in one or more relative positions.

2. A retractable suitcase with a locking mechanism according to claim 1, characterized in that, The lower telescopic frame (132) includes two parallel sleeves (133) and a base (134). One end of each sleeve (133) is connected to the base (134), and the base (134) is fixed to the bottom surface of the lower housing (200). The upper telescopic frame (131) includes two parallel core tubes (135), one end of which is connected to the bottom surface of the upper housing (100), and the other end is inserted into the sleeve (133) for relative sliding. The locking mechanism (140) includes a locking end (141), a trigger end (142), and a linkage mechanism (143). The locking end (141) is disposed between the core tube (135) and the sleeve (133), and the trigger end (142) is disposed on the base (134). The trigger end (142) drives the locking end (141) to lock or unlock the relative position between the core tube (135) and the sleeve (133) through the linkage mechanism (143).

3. A retractable suitcase with a locking mechanism according to claim 2, characterized in that, The base (134) is partially exposed outside the lower housing (200). The trigger end (142) is a winding wheel located on the outside of the base (134) facing the lower housing (200). The linkage mechanism (143) consists of two steel wire ropes connected at one end to the winding wheel and pulled by the winding wheel. The two steel wire ropes extend from one end to the other end of the two sleeves (133) respectively and are connected to two locking ends (141) located at the other end of the two sleeves (133). Pulling the locking ends (141) locks or unlocks the relative position between the core tube (135) and the sleeve (133).

4. A retractable suitcase with a locking mechanism according to claim 3, characterized in that, The locking end (141) includes a floating seat (151), a sliding seat (152), a lock cylinder (153), and a spring (154). The lock cylinder (153) is mounted on the floating seat (151), and the spring (154) is mounted between the floating seat (151) and the sleeve (133), pushing the floating seat (151) to move the lock cylinder (153) toward the core tube (135). The core tube (135) has a lock hole (155) that cooperates with the lock cylinder (153). The sliding seat (152) is located between the floating seat (151) and the core tube (135), and is connected to the other end of the wire rope. The sliding seat (152) and the floating seat (151) are connected by an inclined plane. The wire rope pulls the sliding seat (152) to support the floating seat (151) through the inclined plane, which overcomes the thrust of the spring (154) and moves away from the core tube (135). This causes the lock cylinder (153) to disengage from the lock hole (155). The core tube (135) is provided with a pusher (156) to push the sliding seat (152) in the opposite direction of the wire rope pulling the sliding seat (152). Under the thrust of the spring (154), the floating seat (151) causes the lock cylinder (153) to engage with the lock hole (155).

5. A retractable suitcase with a locking mechanism according to any one of claims 2-4, characterized in that, One end of the core tube (135) is connected to the bottom surface of the upper box (100) through a handle seat (161). The handle seat (161) is partially exposed on the outside of the upper box (100). It also includes a handle (162) connecting two telescopic rods (163). The two telescopic rods (163) pass through the handle seat (161) and are slidably inserted into the core tube (135). A positioning device is provided to lock the relative position between the telescopic rods (163) and the core tube (135).

6. A retractable suitcase with a locking mechanism according to any one of claims 1-4, characterized in that, The upper housing (100) includes a first upper shell (110) and a second upper shell (120). The lower housing (200) includes a first lower shell (210) and a second lower shell (220). The first upper housing (110) has a first upper frame (310) at its opening edge. The second upper housing (120) has a second upper frame (320) at its opening edge. The first lower housing (210) has a first lower frame (330) at its opening edge. The second lower housing (220) has a second lower frame (340) at its opening edge. Along the direction in which the upper housing (100) and the lower housing (200) slide relative to each other, A first slide rail (410) is provided between the first upper frame (310) and the first lower frame (330). A second slide rail (420) is provided between the second upper frame (320) and the second lower frame (340). The first upper housing (110) and the first lower housing (210) are slidably connected relative to each other via the first slide rail (410) to form the first side box (510). The second upper housing (120) and the second lower housing (220) are slidably connected relative to each other via the second slide rail (420) to form the 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 rotatable whole. The other side opens and closes, allowing the first side box (510) and the second side box (520) to have an unfolded state and a closed state. In the closed state, a storage space is formed inside the first side box (510) and the second side box (520). 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). The second upper frame (320) and the second lower frame (340) are aligned on the side facing the first side box (510), and the second slide rail (420) is located in the space on the other side away from the first side box (510).

7. A retractable suitcase with a locking mechanism according to claim 6, characterized in that, 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).

8. A retractable suitcase with a locking mechanism according to claim 7, characterized in that, The floating range Δ of the floating fit clearance (800) is between 0.1mm and 2mm.

9. A retractable suitcase with a locking mechanism according to claim 7, characterized in that, 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). 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 clearance (800).

10. A retractable suitcase with a locking mechanism according to claim 7, characterized in that, The first lower frame (330) extends beyond the first lower housing (210) to form a first extension (331) toward the upper housing (100), and the second lower frame (340) extends beyond the second lower housing (220) to form a second extension (341) toward the upper housing (100).

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