Transformation type luggage case capable of lying flat
By introducing a flip cover and limiting slot into the pull rod mechanism of the suitcase, combined with the design of disassembly and assembly parts and rotating bodies, the problem of inconvenience and insufficient stability of the handle assembly in the prior art is solved, and the luggage is realized Flexible switching and stable use of the box in different states.
Patent Information
- Application Number
- CN202422733848.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-11-11
AI Technical Summary
When the existing suitcase is switched in vertical and horizontal states, the handle assembly must be fully extended to rotate, which leads to inconvenience in use and the lack of a limiting mechanism will cause the suitcase to be unstable when used in vertical state.
A flat-laying convertible suitcase is designed, which realizes the limit of the tie rod seat by introducing a flip cover and a limiting slot into the tie rod mechanism, allowing stable use in a vertical state, and designing the disassembly and assembly parts and rotating bodies. , convenient for switching the suitcase between different states.
It realizes flexible switching between different states of the suitcase, improves operation convenience and stability, avoids the inconvenience of the handle assembly that needs to be fully extended, and ensures the effective use of the suitcase in different scenarios.
Smart Images
Figure CN222217347U_ABST
Abstract
Description
Technical Field
[0001] The utility model particularly relates to a convertible luggage case capable of lying flat. Background Art
[0002] Luggage, as an indispensable equipment in modern travel, has two functions of storage and consignment and a mobile device. The US patent application publication with publication number "US20210244143A1" discloses a set of stackable luggage assemblies, which mainly include a shell, wheels, multi-function wheels and an adjustable handle assembly. Figure 1 It can be clearly seen that multifunctional wheels are installed on the side and lower end of the housing. The handle assembly consists of a handle shaft distributed at the upper end and a pivot distributed at the lower end, and a pull rod is provided on both sides to connect the handle shaft and the pivot. Pull the handle shaft until the pull rod is fully extended from the housing, and then rotate the handle shaft with the pivot as the rotation axis, so that the handle assembly is vertical and can be used in a horizontal position with the suitcase, as shown in the attached public document. Figure 1 shown.
[0003] The above luggage assembly has the following defects:
[0004] The luggage assembly can be switched between vertical and horizontal positions, which is mainly achieved by the handle assembly. The handle assembly must be pulled until the handle is fully extended out of the shell before it can be rotated, which is not a reasonable design. When the luggage is in a vertical position (as shown in the attached document of the public document), the luggage assembly can be switched between vertical and horizontal positions. Figure 1 ), due to the weight of the suitcase and other factors, the handle shaft will be pulled out of the shell and then rotated. The public document does not provide any mechanism to limit the handle shaft, so the luggage assembly cannot be used reasonably at this time. Utility Model Content
[0005] The technical problem to be solved by the utility model is to provide a convertible suitcase that can lie flat in view of the deficiencies of the above-mentioned prior art, in which a flip cover and disassembly and assembly parts are arranged. By locking or unlocking the pull rod seat and rotating the pull rod around the rotating connection between the lower end and the case body, the suitcase can be easily switched between different states to meet the usage requirements in different scenarios.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] A convertible lie-flat suitcase comprises a case body and a drawbar mechanism distributed on the side of the case body, casters are installed on the side or bottom of the case body, the drawbar mechanism comprises a retractable and slidable drawbar and a drawbar seat fixed on the drawbar, and is characterized in that: the lower end of the drawbar is rotatably connected to the case body, a flap installed on the side of the case body is provided between the drawbar and the case body, one end of the flap is hinged to the case body, and the other end is linked to a disassembly and assembly component detachably connected to the case body, and a limit groove adapted to the drawbar seat is provided in the middle of the flap.
[0008] A flap and a limit groove are provided between the pull rod and the box body. Through the rotation of the flap and the constraint of the limit groove, when the disassembly component is connected to the box body, the pull rod seat is limited in the limit groove, so as to limit the pull rod seat (i.e., a part of the pull rod mechanism). When the pull rod is in a vertical use state, the pull rod can be extended, but will not rotate around the box body, so as to realize the stable use of the suitcase in the vertical state. When the disassembly component is not connected to the box body, the flap can be rotated around the hinge between it and the box body, and the pull rod seat is no longer limited. At this time, the pull rod can be flipped, and casters can be installed on the side of the box body or casters equipped on the side can be directly used to realize the box body lying flat. Through the flap and disassembly component, the user can easily unlock the pull rod when needed, and rotate it around the rotation connection between the lower end and the box body, so as to easily realize the switching between different states of the suitcase, and meet the use requirements in different scenarios. It well solves the inconvenience of the handle assembly in the prior art that it needs to be fully extended before it can rotate. Among them, the vertical type not only includes the vertical direction of the box, but also the box can be tilted and pulled.
[0009] The above-mentioned convertible flat suitcase can be further configured as follows: the disassembly and assembly components include a rotating body, the other end of the flip cover is penetrated by a mounting hole, and the rotating body is hinged at the mounting hole; the lower end of the rotating body is provided with a locking tongue block extending toward the side, and the box body is provided with a strip-shaped locking groove corresponding to the locking tongue block, and when the rotating body rotates until the locking tongue block is parallel to the locking groove, the locking tongue block can pass through the locking groove; the upper end of the rotating body is provided with a strip-shaped holding strip that is convenient for human hand to hold.
[0010] The rotating body is hinged at the mounting hole of the flip cover and can rotate around the hinge point. When the state of the suitcase needs to be changed (such as from upright to flat), the user can rotate the rotating body by holding the gripping bar at the upper end of the rotating body. During the rotation process, the locking tongue block at the lower end of the rotating body will rotate accordingly. When the locking tongue block is parallel to the locking groove on the case, the locking tongue block can pass through the locking groove to achieve the connection or separation of the disassembly component and the case. When the disassembly component is connected to the case, after the locking tongue block passes through the locking groove, the locking tongue block is continued to be rotated until the locking tongue block is no longer parallel to the locking groove, so that the disassembly component and the case can be connected. By holding the gripping bar at the upper end of the rotating body, the user can easily rotate the rotating body to achieve the connection or separation of the disassembly component and the case. This design greatly improves the convenience of operation.
[0011] The above-mentioned convertible flat suitcase can be further configured as follows: the flip cover includes a middle plate, one side of the middle plate is bent to form a locking plate, the other side of the middle plate is bent to form a limit baffle, the locking plate and the limit baffle are bent in opposite directions respectively, a limit groove is formed between the middle plate and the limit baffle, the side surface of the box body is provided with a mounting groove corresponding to the hinge between the flip cover and the box body, a hinge seat is fixedly provided at the mounting groove, and the hinge seat is provided with an inclined blocking surface that can rotationally limit the limit baffle.
[0012] The integrated bending direction of the middle plate, the locking plate, and the limit baffle improves the structural strength of the flap, and the limit baffle and the middle plate are naturally formed into a limit groove after bending, without the need to process the limit groove separately, thereby reducing production costs and simplifying the production process. Furthermore, the hinge seat is not only used to fix the flap, but also to limit the rotation of the limit baffle through the inclined baffle surface thereon, thereby ensuring the stability and reliability of the flap during rotation. The inclined baffle surface set on the hinge seat, when the flap rotates around the hinge seat, the limit baffle will be limited by the rotation of the inclined baffle surface on the hinge seat, thereby limiting the rotation angle of the flap, minimizing the shaking or falling off of the flap during rotation, and improving the overall stability of the suitcase.
[0013] The above-mentioned convertible flat suitcase can be further configured as follows: a pad opposite to the flip cover is installed on the inner side of the box body, one side of the pad extends to a position corresponding to the installation slot, one side of the pad is provided with a plurality of groups of non-parallel connecting holes, the other side of the pad extends to the locking slot, the other side of the pad is penetrated by a clearance slot adapted to the locking slot, and a protective cover detachably connected to the pad by screws is distributed below the clearance slot.
[0014] A pad is added to enhance the structural strength of the box, especially at the location where the flap is installed. The connection hole group is designed to be arranged in a non-parallel manner, which is used to fix the hinge seat, and the hinge seat is not easy to deflect after installation. The other side of the pad extends to the locking groove and penetrates the clearance groove that matches the locking groove to ensure that the lock tongue block of the disassembled parts can pass smoothly. A protective cover is further added. When the lock tongue block extends into the locking groove and the clearance groove, the protective cover protects the lock tongue block to prevent the lock tongue block from interfering with the objects in the box.
[0015] The above-mentioned convertible flat suitcase can be further configured as follows: a rotating sleeve is provided at the lower end of the pull rod, a rotating shaft is provided inside the rotating sleeve, rotating seats fixed on the case body are symmetrically provided at both ends of the rotating sleeve, a plug-in hole is provided on the side of the rotating seat facing the rotating sleeve, and the end of the rotating shaft extends toward the rotating seat until it is inserted into the plug-in hole.
[0016] When the flip cover is opened, the pull rod seat is no longer limited, and a person manually pulls or pushes the pull rod to rotate, and the rotating sleeve and the rotating shaft rotate around the rotating seat to realize the rotation of the pull rod.
[0017] The above-mentioned convertible flat suitcase can be further configured as follows: a plurality of groups of protrusions surrounding the outer periphery of the plug-in hole and arranged at intervals are arranged on the side of the rotating seat, and a groove corresponding to the protrusion is arranged at the end of the rotating sleeve, and the outer surface of the protrusion is a curved surface.
[0018] A person applies a certain amount of push or pull force to the pull rod until the protrusion separates from the groove. When the pull rod rotates to the desired angle, the protrusion will cooperate with a set of grooves to keep the pull rod in a fixed position at that angle. Therefore, the pull rod can remain fixed at any rotation angle, improving the flexibility of the luggage case. The surface of the protrusion is curved, which facilitates the separation and cooperation of the protrusion and the groove without excessive interference.
[0019] The above-mentioned convertible flat suitcase can be further configured as follows: the pull rod includes an outer tube and an inner tube, the lower end of the outer tube is linked to a rotating sleeve, through holes are symmetrically provided at both ends of the pull rod seat, the upper end of the outer tube is fixedly connected to the pull rod seat, the inner tube is inserted into the outer tube through the through hole and telescopically cooperates with the outer tube, a pull rod handle is provided at the upper end of the inner tube, a first embedding groove adapted to the outer tube is provided on the side surface of the box body corresponding to the outer tube, a second embedding groove capable of accommodating a rotating sleeve and a rotating seat is provided between the side surface and the bottom surface of the box body, and a third embedding groove capable of accommodating a handle is provided above the side surface of the box body.
[0020] The pull rod is composed of an outer tube and an inner tube to realize the telescopic function of the pull rod. The lower end of the outer tube is linked with the rotating sleeve to realize the rotatable connection between the pull rod and the box. At the same time, through holes are symmetrically set at both ends of the pull rod seat, which are inserted into the outer tube through the through holes and cooperate with the outer tube to ensure the smoothness of the pull rod during the telescopic process. When the pull rod is fixed to the box, the first embedded groove, the second embedded groove, and the third embedded groove can respectively accommodate the outer tube, the rotating sleeve and the rotating seat, and the handle, ensuring that the surface of the box is flat and without protrusions, improving the aesthetics of the box, and at the same time, protecting various components.
[0021] The utility model is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a schematic diagram of an embodiment of the utility model in a vertical use state;
[0023] Figure 2 This is a schematic diagram of a flat-lying use state of an embodiment of the utility model;
[0024] Figure 3 It is a schematic diagram of the exploded structure of the flip cover of the embodiment of the utility model;
[0025] Figure 4 This is a schematic diagram of the linkage between the flip cover and the pull seat of the embodiment of the utility model;
[0026] Figure 5 This is a schematic diagram of the position of the pad in an embodiment of the utility model;
[0027] Figure 6 This is an exploded schematic diagram of the lower end of the pull rod of an embodiment of the utility model.
[0028] Reference numerals: box body 1, locking groove 1a, mounting groove 1b, first embedding groove 1c, second embedding groove 1d, third embedding groove 1e; caster 2; flip cover 3, mounting hole 3a, middle plate 3b, locking plate 3c, limit baffle 3d; limit groove 4; rotating body 5, lock tongue block 5a, gripping strip 5b; hinged seat 6, inclined blocking surface 6a; pad 7, connecting hole group 7a, give way groove 7b; protective cover 8; pull rod mechanism a, pull rod a1, pull rod seat a2, rotating sleeve a3, rotating seat a4, plug-in hole a5, rotating shaft a6, protrusion a7, groove a8, outer tube a9, inner tube a10, pull rod handle a11. DETAILED DESCRIPTION
[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0030] like Figures 1 to 6 The flat-lay convertible suitcase shown in the figure comprises a case body 1, a pull rod a1 mechanism a distributed on the side of the case body 1, casters 2 are installed on the side or bottom of the case body 1, the pull rod a1 mechanism a comprises a retractable and slidable pull rod a1, a pull rod seat a2 fixed on the pull rod a1, the lower end of the pull rod a1 is rotatably connected to the case body 1, a flap 3 installed on the side of the case body 1 is provided between the pull rod a1 and the case body 1, one end of the flap 3 is hinged to the case body 1, and the other end is linked to a disassembly and assembly component detachably connected to the case body 1, and a limiting groove 4 adapted to the pull rod seat a2 is provided in the middle of the flap 3. A flap 3 and a limiting groove 4 are provided between the pull rod a1 and the box body 1. Through the rotation of the flap 3 and the constraint of the limiting groove 4, when the disassembly component is connected to the box body 1, the pull rod seat a2 is limited in the limiting groove 4, so that the pull rod seat a2 is limited. When the pull rod a1 is in a vertical use state, the pull rod a1 can be extended, but will not rotate around the box body 1, so that the luggage case can be used stably in a vertical state. When the disassembly component is not connected to the box body 1, the flap 3 can rotate around the hinge between it and the box body 1, and the pull rod seat a2 is no longer limited. At this time, the pull rod a1 can be flipped, and casters 2 can be installed on the side of the box body 1 or the casters 2 already equipped on the side can be directly used, so that the box body 1 can be laid flat.
[0031] The disassembly and assembly parts include a rotating body 5, and the other end of the flip cover 3 is penetrated by a mounting hole 3a, and the rotating body 5 is hinged at the mounting hole 3a; the lower end of the rotating body 5 is provided with a lock tongue block 5a extending toward the side, and the box body 1 is provided with a strip-shaped locking groove 1a corresponding to the lock tongue block 5a. When the rotating body 5 rotates until the lock tongue block 5a is parallel to the locking groove 1a, the lock tongue block 5a can pass through the locking groove 1a; the upper end of the rotating body 5 is provided with a strip-shaped holding strip 5b that is convenient for human hand holding. The rotating body 5 is hinged at the mounting hole 3a of the flip cover 3 and can rotate around the hinge point. When the state of the suitcase needs to be changed (such as from vertical to flat), the user can rotate the rotating body 5 by holding the holding strip 5b at the upper end of the rotating body 5. During the rotation process, the lock tongue block 5a at the lower end of the rotating body 5 will rotate accordingly. When the locking tongue block 5a is parallel to the locking groove 1a on the box body 1, the locking tongue block 5a can pass through the locking groove 1a, thereby realizing the connection or separation of the disassembly component and the box body 1. When the disassembly component is connected to the box body 1, after the locking tongue block 5a passes through the locking groove 1a, the locking tongue block 5a is continuously rotated until the locking tongue block 5a is no longer parallel to the locking groove 1a, thereby realizing the connection of the disassembly component and the box body 1. By holding the gripping bar 5b at the upper end of the rotating body 5, the user can easily rotate the rotating body 5 to realize the connection or separation of the disassembly component and the box body 1. This design greatly improves the convenience of operation.
[0032] The flip cover 3 includes a middle plate 3b, one side of the middle plate 3b is bent to form a locking plate 3c, and the other side of the middle plate 3b is bent to form a limiting baffle 3d. The locking plate 3c and the limiting baffle 3d are bent in opposite directions respectively, and a limiting groove 4 is formed between the middle plate 3b and the limiting baffle 3d. A mounting groove 1b is provided on the side of the box body 1 corresponding to the hinge between the flip cover 3 and the box body 1, and a hinge seat 6 is fixedly provided at the mounting groove 1b. The hinge seat 6 is provided with an oblique blocking surface 6a capable of rotating and limiting the limiting baffle 3d. The middle plate 3b, the locking plate 3c, and the limiting baffle 3d are bent in an integrated manner to improve the structural strength of the flip cover 3, and the limiting baffle 3d and the middle plate 3b are naturally formed into the limiting groove 4 after being bent, and there is no need to process the limiting groove 4 at another place, thereby reducing the production cost and simplifying the production process. Furthermore, the hinge seat 6 is not only used to fix the flip cover 3, but also to limit the rotation of the limit baffle 3d through the inclined baffle surface 6a thereon, thereby ensuring the stability and reliability of the flip cover 3 during the rotation process. The inclined baffle surface 6a provided on the hinge seat 6, when the flip cover 3 rotates around the hinge seat 6, the limit baffle 3d will be limited by the rotation of the inclined baffle surface 6a on the hinge seat 6, thereby limiting the rotation angle of the flip cover 3, minimizing the shaking or falling off of the flip cover 3 during the rotation process, and improving the overall stability of the suitcase.
[0033] The inner side of the box body 1 is provided with a backing plate 7 opposite to the flip cover 3. One side of the backing plate 7 extends to the position corresponding to the installation groove 1b. One side of the backing plate 7 is provided with a plurality of mutually non-parallel connection hole groups 7a. The other side of the backing plate 7 extends to the locking groove 1a. The other side of the backing plate 7 is penetrated with a clearance groove 7b adapted to the locking groove 1a. Below the clearance groove 7b is a protective cover 8 detachably connected to the backing plate 7 by screws. The backing plate 7 is added to enhance the structural strength of the box body 1, especially at the position where the flip cover 3 is installed. The connection hole group 7a is designed to be arranged in a non-parallel manner, which is used to fix the hinge seat 6, and the hinge seat 6 is not easy to deflect after installation. The other side of the backing plate 7 extends to the locking groove 1a and penetrates the clearance groove 7b adapted to the locking groove 1a to ensure that the lock tongue block 5a of the disassembly component can pass smoothly. A protective cover 8 is further provided. When the lock tongue block 5 a extends into the locking groove 1 a and the clearance groove 7 b , the protective cover 8 protects the lock tongue block 5 a to prevent the lock tongue block 5 a from interfering with objects in the box body 1 .
[0034] The lower end of the pull rod a1 is provided with a rotating sleeve a3, and a rotating shaft a6 is provided inside the rotating sleeve a3. The rotating sleeve a3 is symmetrically provided with rotating seats a4 fixed to the box body 1 at both ends. The rotating seat a4 is provided with a plug hole a5 on the side facing the rotating sleeve a3, and the end of the rotating shaft a6 extends toward the rotating seat a4 until it is inserted into the plug hole a5. When the flip cover 3 is opened, the pull rod seat a2 is no longer limited, and the pull rod a1 is rotated by pulling or pushing it manually, and the rotating sleeve a3 and the rotating shaft a6 will rotate around the rotating seat a4 to realize the rotation of the pull rod a1.
[0035] The side of the rotating seat a4 is provided with a plurality of groups of protrusions a7 which surround the outer periphery of the plug-in hole a5 and are arranged at intervals. The end of the rotating sleeve a3 is provided with a groove a8 corresponding to the protrusion a7, and the outer surface of the protrusion a7 is a curved surface. A certain thrust or pulling force is applied to the pull rod a1 by hand until the protrusion a7 is separated from the groove a8. When the pull rod a1 is rotated to the required angle, the protrusion a7 will cooperate with a group of grooves a8 to achieve that the pull rod a1 remains fixed at this angle. Therefore, the pull rod a1 can remain fixed at any rotation angle, improving the flexibility of the suitcase. The surface of the protrusion a7 is a curved surface, which facilitates the separation and cooperation of the protrusion a7 and the groove a8 without excessive interference.
[0036] The pull rod a1 includes an outer tube a9 and an inner tube a10. The lower end of the outer tube a9 is linked with the rotating sleeve a3. Through holes are symmetrically arranged at both ends of the pull rod seat a2. The upper end of the outer tube a9 is fixedly connected with the pull rod seat a2. The inner tube a10 is inserted into the outer tube a9 through the through hole and telescopically cooperates with the outer tube a9. The upper end of the inner tube a10 is provided with a pull rod handle a11. The side of the box body 1 is provided with a first embedding groove 1c adapted to the outer tube a9 corresponding to the outer tube a9. A second embedding groove 1d that can accommodate the rotating sleeve a3 and the rotating seat a4 is provided between the side and the bottom of the box body 1. A third embedding groove 1e that can accommodate the handle is provided above the side of the box body 1. The pull rod a1 is composed of the outer tube a9 and the inner tube a10 to realize the telescopic function of the pull rod a1. The lower end of the outer tube a9 is linked with the rotating sleeve a3 to realize the rotatable connection between the pull rod a1 and the box body 1. At the same time, through holes are symmetrically arranged at both ends of the rod seat a2 to ensure the smoothness of the rod a1 during the extension and retraction process. When the rod a1 is fixed to the box body 1, the first embedding groove 1c, the second embedding groove 1d, and the third embedding groove 1e can respectively accommodate the outer tube a9, the rotating sleeve a3 and the rotating seat a4, and the handle, ensuring that the surface of the box body 1 is flat and has no protrusions, improving the aesthetics of the box body 1, and at the same time, protecting various components.
[0037] It should be noted that the caster 2 is a prior art and is not the invention of this application, so it is not disclosed in detail in this embodiment. Users can choose casters 2 that are easy to disassemble and assemble according to their needs. Four caster 2 positioning positions are set on the side and bottom of the box body 1. When the suitcase needs to be used upright, the pull rod a1 is rotated to fit the side of the box body 1, and then the pull rod seat a2 is locked in the limit groove 4 using the flip cover 3 and the disassembly and assembly parts. In this use state, the caster 2 is installed on the bottom surface of the box body 1. When the suitcase needs to be used flat, the flip cover 3 is opened, the pull rod seat a2 is unlocked, and the pull rod a1 is pushed or pulled manually, and the shaft a6 is rotated to the desired angle. In this use state, the caster 2 is installed on the side of the box body 1.
Claims
1. A convertible flat suitcase, comprising a case body, a pull rod mechanism distributed on the side of the case body, casters being installed on the side or bottom of the case body, the pull rod mechanism comprising a retractable and slidable pull rod and a pull rod seat fixed on the pull rod, characterized in that: The lower end of the pull rod is rotatably connected to the box body, and a flap installed on the side of the box body is provided between the pull rod and the box body. One end of the flap is hinged to the box body, and the other end is linked to a disassembly component detachably connected to the box body. A limiting groove adapted to the pull rod seat is provided in the middle of the flap.
2. The convertible flat suitcase according to claim 1, characterized in that: The disassembly and assembly components include a rotating body, the other end of the flip cover is penetrated by a mounting hole, and the rotating body is hinged at the mounting hole; the lower end of the rotating body is provided with a locking tongue block extending toward the side, and the box body is provided with a strip-shaped locking groove corresponding to the locking tongue block, and when the rotating body rotates until the locking tongue block is parallel to the locking groove, the locking tongue block can pass through the locking groove; the upper end of the rotating body is provided with a strip-shaped holding strip that is convenient for human hand holding.
3. The convertible flat suitcase according to claim 2, characterized in that: The flip cover includes an intermediate plate, one side of the intermediate plate is bent to form a locking plate, the other side of the intermediate plate is bent to form a limiting baffle, the locking plate and the limiting baffle are bent in opposite directions respectively, a limiting groove is formed between the intermediate plate and the limiting baffle, the side surface of the box body is provided with an installation groove corresponding to the hinge between the flip cover and the box body, a hinge seat is fixedly provided at the installation groove, and the hinge seat is provided with an inclined blocking surface that can limit the rotation of the limiting baffle.
4. The convertible flat suitcase according to claim 3, characterized in that: A pad opposite to the flip cover is installed on the inner side of the box body, one side of the pad extends to the position corresponding to the installation slot, one side of the pad is provided with a plurality of groups of connection holes that are not parallel to each other, the other side of the pad extends to the locking slot, the other side of the pad is penetrated by a clearance slot adapted to the locking slot, and a protective cover detachably connected to the pad by screws is distributed below the clearance slot.
5. The convertible flat suitcase according to any one of claims 1 to 4, characterized in that: A rotating sleeve is provided at the lower end of the pull rod, a rotating shaft is provided inside the rotating sleeve, rotating seats fixed on the box body are symmetrically provided at both ends of the rotating sleeve, a plug-in hole is provided on the side of the rotating seat facing the rotating sleeve, and the end of the rotating shaft extends toward the rotating seat until it is inserted into the plug-in hole.
6. The convertible flat suitcase according to claim 5, characterized in that: The side surface of the rotating seat is provided with a plurality of groups of protrusions which surround the outer periphery of the plug-in hole and are arranged at intervals. The end of the rotating sleeve is provided with grooves corresponding to the protrusions. The outer surface of the protrusion is a curved surface.
7. The convertible flat suitcase according to claim 5, characterized in that: The pull rod includes an outer tube and an inner tube. The lower end of the outer tube is linked to a rotating sleeve. Through holes are symmetrically provided at both ends of the pull rod seat. The upper end of the outer tube is fixedly connected to the pull rod seat. The inner tube is inserted into the outer tube through the through hole and telescopically cooperates with the outer tube. A pull rod handle is provided at the upper end of the inner tube. A first embedding groove adapted to the outer tube is provided on the side surface of the box body corresponding to the outer tube. A second embedding groove capable of accommodating a rotating sleeve and a rotating seat is provided between the side surface and the bottom surface of the box body. A third embedding groove capable of accommodating a handle is provided above the side surface of the box body.