Flat-lying conversion type luggage case

Abstract

The utility model relates to a flat-lying conversion type luggage case. The lower end of a pull rod is rotatably connected with a case body, and is inserted and fixed with a lock hole in a pull rod seat through a spring bolt on a lock seat. The unlocking mechanism controls the spring bolt to stretch out and draw back, locking and unlocking of the pull rod are achieved, and the luggage case can be switched among different states conveniently. The lock seat can be detachably divided into the upper cover plate and the lower cover plate, and assembling and maintaining are convenient. The unlocking block is connected with the shifting buckle through a screw, manual operation is facilitated, and friction force and operation convenience are improved through anti-skid lines and protruding strips. The pull rod can rotate around the box body due to the design of the rotating sleeve and the rotating seat, and the bump is matched with the groove to realize fixation at any angle. The pull rod is composed of an outer pipe and an inner pipe and achieves the telescopic function. The embedded grooves ensure that the surface of the box body is smooth and attractive, and meanwhile components are protected. According to the design, the problem that a handle assembly is inconvenient to use in the prior art is solved, and the practicability and flexibility of the luggage case are improved.

Description

Technical Field

[0001] The utility model particularly relates to a lie-flat conversion type luggage case. 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 also be pulled out of the shell, and 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 flat-lying convertible suitcase in view of the deficiencies of the above-mentioned prior art. The lock seat and the pull rod seat are connected by a lock tongue and a keyhole, which facilitates unlocking the pull rod and rotating it around the lower end of the case body, thereby realizing the state switching of the suitcase and adapting to different scenarios, and solving the problem that the handle must be fully extended before it can be rotated.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A lie-flat convertible suitcase comprises a case body and a pull rod mechanism distributed on the side of the case body, casters are installed on the side or bottom of the case body, the pull rod mechanism comprises a retractable sliding pull rod and a pull rod seat fixed on the pull rod, and is characterized in that: the lower end of the pull rod is rotatably connected to the case body, a lock seat fixed to the case body is provided between the pull rod and the case body, a retractable locking tongue is provided in the lock seat, the locking tongue is linked to an unlocking mechanism, a keyhole adapted to the locking tongue is provided on the pull rod seat, when the locking tongue is inserted into the keyhole, the pull rod is fixed to the side of the case body; when the locking tongue is separated from the keyhole, the pull rod can rotate around the rotation connection between the lower end and the case body.

[0008] Through the plugging and separation of the lock tongue on the lock seat and the keyhole on the pull rod seat, the user can easily unlock the pull rod when needed and rotate it around the rotating connection between the lower end and the box body, so as to easily switch the suitcase between different states, meet the use requirements in different scenarios, and well solve the inconvenience of the handle assembly in the prior art that it needs to be fully extended before it can be rotated. The lower end of the pull rod is connected to the box body through a rotatable connection mechanism, allowing the pull rod to rotate relative to the box body within a certain range, thereby realizing the flexible switching of the suitcase between different states (vertical, horizontal). When the lock tongue is inserted into the keyhole, the pull rod is fixed to the side of the box body. At the same time, the extension and retraction of the lock tongue is controlled by the unlocking mechanism, and the user can easily unlock the pull rod and rotate it. When the lock tongue exits the keyhole, the pull rod seat is no longer limited, and the pull rod can be rotated by pushing or pulling manually.

[0009] The above-mentioned lie-flat convertible suitcase can be further configured as follows: an unlocking block is provided between the lock tongue and the lock seat, the lock seat is provided with a lock tongue hole adapted to the lock tongue on the side facing the pull rod seat, the lock tongue is linked to a transmission shaft extending toward the unlocking block, the unlocking block is provided with a strip groove inclined on the end face facing the transmission shaft, the end of the transmission shaft is inserted into the strip groove, the lock seat is provided with a sliding guide groove parallel to the pull rod seat, the upper part of the unlocking block penetrates into the sliding guide groove and can move back and forth along the sliding guide groove; the end of the lock tongue away from the pull rod seat is linked to a spring.

[0010] The unlocking block is moved by hand along the sliding guide groove, and the unlocking block moves horizontally. Due to the inclined setting of the strip groove and the guidance of the lock tongue by the lock tongue hole, the horizontal movement of the unlocking block is converted into the telescopic movement of the lock tongue, so the lock tongue withdraws or inserts into the keyhole to achieve the locking and unlocking of the pull rod seat. People can change the use state of the box according to actual needs. Among them, the spring mainly has two functions. First, it provides a certain restoring force for the lock tongue. When the unlocking block is released by hand, the lock tongue will drive the unlocking block to reset under the action of the spring; second, it improves the working stability of the lock tongue. No matter whether the lock tongue is moving or not moving, it will not shake.

[0011] The above-mentioned lie-flat convertible suitcase can be further configured as follows: the lock seat is provided with a hook on the side facing the pull rod seat, and the pull rod seat is provided with a slot adapted to the hook.

[0012] When the rod seat is restricted on the box body, in addition to the lock tongue and the keyhole cooperating, the hook and the slot also cooperate to enhance the connection strength between the rod seat and the box body.

[0013] The above-mentioned lie-flat convertible suitcase can be further configured as follows: the upper part of the unlocking block is detachably connected to a buckle by a screw, the buckle is installed in the moving guide groove and can reciprocate in the sliding guide groove, the unlocking block is provided with unlocking marks on both sides of the buckle, the surface of the buckle is provided with anti-slip grooves, and a convex strip is provided in the middle of the buckle.

[0014] The human hand can control the lateral movement of the unlocking block through the buckle. The anti-slip texture on the surface and the convex strip in the middle increase the friction, making it easier for the human hand to push the buckle. The unlocking mark helps people understand whether the current state is locked or unlocked.

[0015] The above-mentioned lie-flat convertible suitcase can be further configured as follows: the lock seat includes an upper cover plate and a lower cover plate which are detachably connected to each other, the lower cover plate is fixed on the case body, the lock tongue holes are distributed on the same side of the upper cover plate and the lower cover plate and are arranged between the two, the sliding guide grooves are distributed in the middle of the upper cover plate and are arranged through, the hooks are distributed on the outer side of the lower cover plate, the lower cover plate is provided with mounting holes corresponding to the springs, the lock tongue is also provided with a guide shaft at the end away from the pull rod seat, one end of the spring is inserted in the guide shaft and the other end is sleeved on the outer periphery of the guide shaft; a pad plate opposite to the lower cover plate is installed on the inner side of the case body, and a connecting hole group is provided on one side of the pad plate.

[0016] The lock seat is designed as a detachable upper cover and lower cover to facilitate assembly and replacement of various parts. The mounting holes and guide shafts are used to guide the spring to prevent the spring from shaking left and right and improve the movement stability of the lock tongue. A pad is added to enhance the structural strength of the box, especially at the location where the lock seat is installed. The connection hole group is used to fix the hinge seat.

[0017] The above-mentioned lie-flat convertible 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.

[0018] When the lock tongue exits the keyhole, the pull rod seat is no longer restricted, 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.

[0019] The above-mentioned flat convertible suitcase can be further configured as follows: a plurality of groups of protrusions are arranged on the side of the rotating seat and surround the outer periphery of the plug-in hole and are arranged at intervals, 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.

[0020] 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.

[0021] The above-mentioned lie-flat convertible 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.

[0022] 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, and the upper end of the outer tube is inserted into the through hole of the pull rod seat 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 has no protrusions, improving the aesthetics of the box, and at the same time, protecting various components.

[0023] The utility model is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of an embodiment of the utility model in a vertical use state;

[0025] Figure 2 This is a schematic diagram of a flat-lying use state of an embodiment of the utility model;

[0026] Figure 3 This is an exploded schematic diagram of the upper cover plate and the lower cover plate of an embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the cooperation between the hook and the slot of an embodiment of the utility model;

[0028] Figure 5 This is an exploded schematic diagram of the lower end of the pull rod of an embodiment of the utility model;

[0029] Figure 6 This is a schematic diagram of the position of the pad in an embodiment of the utility model;

[0030] Figure 7 A schematic diagram of a pad according to an embodiment of the utility model;

[0031] Figure 8 This is a schematic diagram of an unlocking block according to an embodiment of the present utility model.

[0032] Reference numerals: box body 1, first embedding groove 1c, second embedding groove 1d, third embedding groove 1e; caster 2; upper cover plate 3, sliding guide groove 3a, lock tongue hole 3b; lower cover plate 4, hook 4a, mounting hole 4b; lock tongue 5, transmission shaft 5a; guide shaft 6; pad 7, connecting hole group 7a; spring 8; unlocking block 9, strip groove 9a, pull button 9b, convex strip 9c; pull rod mechanism a, pull rod a1, pull rod seat a2, rotating sleeve a3, rotating seat a4, plug-in hole a5, rotating shaft a6, convex block a7, groove a8, outer tube a9, inner tube a10, slot a11, pull rod handle a12, keyhole a13. DETAILED DESCRIPTION

[0033] 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.

[0034] like Figures 1 to 8The 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 lock seat fixed on the case body 1 is provided between the pull rod a1 and the case body 1, a retractable lock tongue 5 is provided in the lock seat, the lock tongue 5 is linked to an unlocking mechanism, a keyhole a13 adapted to the lock tongue 5 is provided on the pull rod seat a2, when the lock tongue 5 is inserted into the keyhole a13, the pull rod a1 is fixed to the side of the case body 1; when the lock tongue 5 is separated from the keyhole a13, the pull rod a1 can rotate around the rotation connection between the lower end and the case body 1. Through the lock tongue 5 on the lock seat and the keyhole a13 on the pull rod seat a2 for plugging and separation, the user can easily unlock the pull rod a1 when needed, and rotate it around the rotation connection between the lower end and the box body 1, so as to easily realize the switching between different states of the suitcase, meet the use requirements in different scenarios, and well solve the inconvenience of the handle assembly in the prior art that it needs to be fully extended before it can be rotated. The lower end of the pull rod a1 is connected to the box body 1 through a rotatable connection mechanism, allowing the pull rod a1 to rotate relative to the box body 1 within a certain range, thereby realizing the flexible switching of the suitcase between different states (vertical, horizontal). When the lock tongue 5 is inserted into the keyhole a13, the pull rod a1 is fixed to the side of the box body 1. At the same time, the extension and contraction of the lock tongue 5 is controlled by the unlocking mechanism, and the user can easily unlock the pull rod a1 and rotate it. When the lock tongue 5 exits the keyhole a13, the pull rod seat a2 is no longer limited, and the pull rod a1 can be rotated by pushing or pulling manually.

[0035] An unlocking block 9 is arranged between the lock tongue 5 and the lock seat. The lock seat is provided with a lock tongue hole 3b adapted to the lock tongue 5 on one side facing the pull rod seat a2. The lock tongue 5 is linked with a transmission shaft 5a extending toward the unlocking block 9. The unlocking block 9 is provided with a strip groove 9a at an angle at the end surface facing the transmission shaft 5a. The end of the transmission shaft 5a is inserted into the strip groove 9a. The lock seat is provided with a sliding guide groove 3a parallel to the pull rod seat a2. The upper part of the unlocking block 9 penetrates the sliding guide groove 3a and can reciprocate along the sliding guide groove 3a. The end of the lock tongue 5 located away from the pull rod seat a2 is linked with a spring 8. The unlocking block 9 is manually moved along the sliding guide groove 3a, and the unlocking block 9 moves horizontally. Due to the inclined setting of the strip groove 9a and the guidance of the lock tongue hole 3b to the lock tongue 5, the horizontal movement of the unlocking block 9 is converted into the telescopic movement of the lock tongue 5. Therefore, the lock tongue 5 withdraws from or inserts into the keyhole a13 to achieve the locking and unlocking of the pull rod seat a2. People can change the use state of the box 1 according to actual needs. Among them, the spring 8 mainly has two functions. First, it provides a certain restoring force for the lock tongue 5. When the unlocking block 9 is released by hand, the lock tongue 5 will drive the unlocking block 9 to reset under the action of the spring 8; second, it improves the working stability of the lock tongue 5. No matter the lock tongue 5 is moving or not moving, there will be no shaking.

[0036] The lock seat is provided with a hook 4a on one side facing the rod seat a2, and the rod seat a2 is provided with a slot a11 adapted to the hook 4a. When the rod seat a2 is restricted on the box body 1, in addition to the lock tongue 5 cooperating with the keyhole a13, the hook 4a also cooperates with the slot a11, thereby enhancing the connection strength between the rod seat a2 and the box body 1.

[0037] The upper part of the unlocking block 9 is detachably connected with a toggle button 9b by screws, and the toggle button 9b is installed in the sliding guide groove 3a and can reciprocate in the sliding guide groove 3a. The unlocking block 9 is provided with unlocking marks on both sides of the toggle button 9b, and the surface of the toggle button 9b is provided with anti-skid patterns, and the middle of the toggle button 9b is provided with a convex strip 9c. The human hand can control the lateral movement of the unlocking block 9 through the toggle button 9b. The anti-skid patterns on the surface and the convex strip 9c in the middle increase the friction force, making it convenient for the human hand to push the toggle button 9b, and the unlocking mark helps people understand whether the current state is locked or unlocked.

[0038] The lock base includes an upper cover plate 3 and a lower cover plate 4 that are detachably connected to each other. The lower cover plate 4 is fixed on the box body 1. The lock tongue hole 3b is distributed on the same side of the upper cover plate 3 and the lower cover plate 4 and is arranged between the two. The sliding guide groove 3a is distributed in the middle of the upper cover plate 3 and is arranged through. The hook 4a is distributed on the outer side of the lower cover plate 4. The lower cover plate 4 is provided with a mounting hole 4b corresponding to the spring 8. The lock tongue 5 is located at the end away from the pull rod seat a2 and is also provided with a guide shaft 6. One end of the spring 8 is inserted into the guide shaft 6 and the other end is sleeved on the outer periphery of the guide shaft 6. The inner side of the box body 1 is installed with a pad 7 opposite to the lower cover plate 4, and one side of the pad 7 is provided with a connecting hole group 7a. The lock base is designed as a detachably connected upper cover plate 3 and lower cover plate 4, which is convenient for assembly and replacement of various components. The mounting hole 4b and the guide shaft 6 are both used to guide the spring 8 to prevent the spring 8 from shaking left and right and improve the movement stability of the lock tongue 5. The additional backing plate 7 is provided to enhance the structural strength of the box body 1, especially at the position where the lock seat is installed. The connecting hole group 7a is used to fix the hinge seat 6.

[0039] 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. Rotating seats a4 fixed to the box body 1 are symmetrically provided at both ends of the rotating sleeve a3. 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 lock tongue 5 exits the keyhole a13, the pull rod seat a2 is no longer restricted, and the pull rod a1 is rotated by hand pulling or pushing, and the rotating sleeve a3 and the rotating shaft a6 will rotate around the rotating seat a4, realizing the rotation of the pull rod a1.

[0040] 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.

[0041] 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 a12. 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.

[0042] 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 implementation. 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 unlocking block 9 is used to insert the lock tongue 5 into the keyhole a13, so that the pull rod seat a2 is locked on the box body 1. 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 unlocking block 9 will withdraw the lock tongue 5 from the keyhole a13, the pull rod seat a2 is unlocked, and the pull rod a1 is manually pushed or pulled to rotate the shaft a6 to the desired angle. In this use state, the caster 2 is installed on the side of the box body 1.

Claims

1. A flat-lay convertible luggage case, 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 lock seat fixed to the box body is provided between the pull rod and the box body. A retractable lock tongue is provided in the lock seat, and the lock tongue is linked to an unlocking mechanism. A keyhole adapted to the lock tongue is provided on the pull rod seat. When the lock tongue is inserted into the keyhole, the pull rod is fixed to the side of the box body; when the lock tongue is disengaged from the keyhole, the pull rod can rotate around the rotation connection between the lower end and the box body.

2. The lie-flat convertible suitcase according to claim 1, characterized in that: An unlocking block is arranged between the lock tongue and the lock seat, and a lock tongue hole adapted to the lock tongue is arranged on the side of the lock seat facing the pull rod seat, and the lock tongue is linked to a transmission shaft extending toward the unlocking block, and a strip groove is arranged obliquely on the end face of the unlocking block facing the transmission shaft, and the end of the transmission shaft is inserted into the strip groove, and a sliding guide groove parallel to the pull rod seat is provided on the lock seat, and the upper part of the unlocking block penetrates into the sliding guide groove and can move back and forth along the sliding guide groove; the end of the lock tongue away from the pull rod seat is linked to a spring.

3. The lie-flat convertible luggage case according to claim 2, characterized in that: The lock seat is provided with a hook on one side facing the pull rod seat, and the pull rod seat is provided with a slot adapted to the hook.

4. The lie-flat convertible luggage case according to claim 3, characterized in that: The upper part of the unlocking block is detachably connected to a buckle by a screw, the buckle is installed in the moving guide groove and can move back and forth in the sliding guide groove, the unlocking block is provided with unlocking marks on both sides of the buckle, the surface of the buckle is provided with anti-slip grooves, and a convex strip is provided in the middle of the buckle.

5. The lie-flat convertible luggage case according to claim 4, characterized in that: The lock seat includes an upper cover plate and a lower cover plate which are detachably connected to each other, the lower cover plate is fixed on the box body, the lock tongue holes are distributed on the same side of the upper cover plate and the lower cover plate and are arranged between the two, the sliding guide grooves are distributed in the middle of the upper cover plate and are arranged through, the hooks are distributed on the outer side of the lower cover plate, the lower cover plate is provided with mounting holes corresponding to the spring, the lock tongue is also provided with a guide shaft at the end away from the pull rod seat, one end of the spring is inserted in the guide shaft, and the other end is sleeved on the outer periphery of the guide shaft; a pad opposite to the lower cover plate is installed on the inner side of the box body, and a connecting hole group is provided on one side of the pad plate.

6. The lie-flat convertible luggage case according to any one of claims 1 to 5, 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.

7. The lie-flat convertible luggage case according to claim 6, 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.

8. The lie-flat convertible luggage case according to claim 6, 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.

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