Wide-pull-rod flat-lying conversion type luggage case

Abstract

The utility model provides a wide-pull-rod flat-lying conversion type luggage case. The wide-pull-rod flat-lying conversion type luggage case comprises a case body, a pull rod mechanism and a trundle mechanism, the lower end of the pull rod is rotatably connected with the trundle seat, a lock seat is arranged between the pull rod and the box body and internally provided with a lock tongue, a lock hole is formed in the pull rod seat, and the lock tongue and the lock hole are controlled to be inserted and withdrawn through an unlocking mechanism, so that the pull rod is fixed and unlocked. A sliding guide groove is formed between the spring bolt and the unlocking block, and the spring bolt is controlled to stretch out and draw back through movement of the unlocking block. In addition, the lock seat is provided with a convex column, and the pull rod seat is correspondingly provided with an insertion hole, so that the connection strength is enhanced. And the unlocking block is provided with the shifting buckle, so that user operation is facilitated. And the base plate is arranged in the box body to enhance the structural strength. The pull rod comprises an outer pipe and an inner pipe, the telescopic function is achieved, the lower end of the outer pipe is in linkage with a rotating sleeve, a rotating shaft is arranged in the rotating sleeve, and the trundle seat is provided with a U-shaped rotating groove to achieve rotation of the pull rod. The luggage case can be flexibly switched between a vertical state and a horizontal state and is convenient to maintain.

Description

Technical Field

[0001] The utility model particularly relates to a wide-trolley lie-flat convertible luggage case. Background Art

[0002] Suitcases, as an indispensable equipment in modern travel, have the functions of storage, check-in and mobile devices. The US patent application 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 multi-function wheels are installed on the side and bottom of the shell. The handle assembly consists of a handle shaft distributed at the upper end and a pivot distributed at the lower end. A pull rod is set on each side to connect the handle shaft and the pivot. Pull the handle shaft until the pull rod is fully extended from the shell, and then rotate the handle shaft with the pivot as the rotation axis. The handle assembly will be vertical and can be used with the suitcase in a horizontal position. Figure 1 shown.

[0003] The above luggage assembly has the following defects:

[0004] The luggage assembly can be switched between vertical and horizontal positions, mainly by the handle assembly. The handle assembly must be pulled until the handle is fully extended from the shell before it can be rotated, which is not a reasonable design. When the luggage is in the 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 factors such as the weight of the suitcase, the handle shaft will also be pulled out of the shell. 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 present invention addresses the shortcomings of the prior art by providing a convertible suitcase with a wide pull handle that can be flexibly switched between upright and horizontal positions to accommodate various usage scenarios. Furthermore, the lower end of the pull handle is mounted on a caster seat, facilitating maintenance and preventing wear and tear on the suitcase caused by frequent rotation.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A wide-trolley lie-flat convertible suitcase comprises a suitcase body, a tie rod mechanism distributed on the side of the suitcase body, a caster mechanism installed on the side or bottom of the suitcase body, the caster mechanism comprising a caster seat installed on the suitcase body, the tie rod mechanism comprising a telescopic sliding tie rod and a tie rod seat fixed on the tie rod, and is characterized in that: the lower end of the tie rod is rotatably connected to the caster seat, a lock seat fixed to the suitcase body is provided between the tie rod and the suitcase body, a lock tongue is provided in the lock seat, a keyhole adapted to the lock tongue is provided on the tie rod seat, the lock tongue is linked to an unlocking mechanism that can control the movement of the lock tongue, when the lock tongue is inserted into the keyhole, the tie rod is fixed to the side of the suitcase body; when the lock tongue is disengaged from the keyhole, the tie rod can rotate around the rotation connection between the lower end and the caster seat.

[0008] An unlocking mechanism controls the insertion and removal of the lock tongue and keyhole. When the lock tongue is inserted into the keyhole, the pull rod is fixed to the side of the suitcase and cannot rotate about the caster base, allowing the suitcase to be used in an upright position. When the lock tongue is removed from the keyhole, the lower end of the pull rod, due to its rotatable connection to the caster base, can rotate relative to the suitcase, allowing the suitcase to be converted from upright to horizontal position. This enhances the suitcase's flexibility, allowing it to be flexibly switched between upright and horizontal positions, improving its usability and adapting to various usage scenarios, whether towing it in a horizontal position or pushing it in an upright position. Furthermore, the "rotatable connection between the lower end of the pull rod and the caster base" prevents wear and tear at the hinged joint after repeated use, making replacement of the caster base easier than replacing the suitcase itself, thus facilitating subsequent maintenance. Furthermore, the wide gap between the caster bases further increases the width of the pull rod, improving its structural strength and facilitating better control.

[0009] The above-mentioned wide-trolley 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 sliding guide groove parallel to the pull rod seat, the upper part of the unlocking block penetrates the sliding guide groove and can move back and forth along the sliding guide groove; the lock seat is provided with a lock tongue hole adapted to the lock tongue on the side facing the pull rod seat, the lower end of the lock tongue is hinged with a connecting shaft, and the two ends of the connecting shaft are installed on the lock seat; the upper end of the lock tongue is provided with a hook body, and the lower part of the unlocking block is provided with a push plate corresponding to the hook body, and the push plate is arranged obliquely to the sliding guide groove, and the outer periphery of the connecting shaft is provided with a torsion spring, one end of the torsion spring is linked to the lock tongue, and the other end is linked to the lock seat.

[0010] Pushing the upper portion of the unlocking block along the sliding guide groove causes the push plate to move laterally. Because the push plate is tilted relative to the sliding guide groove, the latch hook, acting on the torsion spring, maintains contact with the push plate. The hook then rotates around the connecting axis until it is pushed out of the latch hole and engages the keyhole, securing the drawbar seat. Pushing the unlocking block in the opposite direction causes the torsion spring to automatically reset the hook, allowing it to exit the keyhole, unlock the drawbar, and rotate around the castor seat, changing the suitcase's usability.

[0011] The above-mentioned wide-trolley lie-flat convertible suitcase can be further configured as follows: a guide block is further provided at the upper end of the lock tongue, the guide block and the hook body are staggered relative to the connecting shaft, and the push plate is inserted between the guide block and the hook body.

[0012] The guide block and the hook body cooperate with each other to guide the push plate. At the same time, during the reset process, the push plate will push the guide block to help the hook body reset, improve the sensitivity of the lock tongue, and prevent the lock tongue from failing.

[0013] The above-mentioned wide-trolley lie-flat convertible suitcase can be further configured as follows: the lock seat is provided with several groups of bosses, the tie rod seat is provided with a group of matching holes corresponding to each group of bosses; and the bosses are provided with screw mounting holes for connecting screws.

[0014] When the draw rod seat is restricted on the box body, in addition to the cooperation between the hook body and the keyhole, the protruding column and the cooperation hole are also cooperated, thereby enhancing the connection strength between the draw rod seat and the box body.

[0015] The above-mentioned wide-trolley lie-flat convertible suitcase can be further configured as follows: the upper part of the unlocking block is provided with a dial buckle integrally formed with the push plate, the dial buckle is installed in the sliding guide groove and can move back and forth in the sliding guide groove, the lock seat is provided with unlocking marks on both sides of the sliding guide groove, the surface of the dial buckle is provided with anti-slip grooves, and a convex strip is provided in the middle of the dial buckle.

[0016] The human hand can control the lateral movement of the unlocking block through the buckle. The anti-slip grooves on its surface and the convex strips 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.

[0017] The above-mentioned wide-trolley lie-flat convertible suitcase can be further configured as follows: a pad opposite to the lock seat is installed on the inner end surface of the case body, and the pad is detachably connected to the case body and the lock seat in sequence by screws.

[0018] Add a pad to improve the structural strength of the box, especially where the lock seat is installed.

[0019] The above-mentioned wide-trolley 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, the caster seat is provided with a U-shaped rotating groove adapted to the rotating sleeve, a plug hole is provided on the side of the U-shaped rotating groove, and the end of the rotating shaft extends toward the caster seat until it is inserted into the plug hole.

[0020] 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 relative to the caster seat to realize the rotation of the pull rod.

[0021] The above-mentioned wide-trolley lie-flat convertible suitcase can be further configured as follows: the side of the U-shaped rotating groove is provided with a plurality of groups of grooves surrounding the outer periphery of the plug-in hole and arranged at intervals, the end of the rotating sleeve is provided with grooves and corresponding protrusions, and the outer surface of the protrusion is curved.

[0022] A user manually applies a certain amount of force to the handle until the protrusion separates from the groove. When the handle is rotated to the desired angle, the protrusion engages with a set of grooves, securing the handle at that angle. This allows the handle to remain fixed at any angle, enhancing the suitcase's flexibility. The curved surface of the protrusion facilitates the separation and engagement of the protrusion and groove without excessive interference.

[0023] The above-mentioned wide-trolley lie-flat convertible suitcase can be further configured as follows: the tie rod includes an outer tube and an inner tube, the lower end of the outer tube is linked to the rotating sleeve, through holes are symmetrically provided at both ends of the tie rod seat, the upper end of the outer tube is fixedly connected to the tie rod seat, the inner tube is inserted into the outer tube through the through hole and cooperates with the outer tube telescopically, the upper end of the inner tube is provided with a tie rod handle, the side surface of the box body is provided with a first embedding groove adapted to the outer tube corresponding to the outer tube, and the upper side of the box body is provided with a second embedding groove that can accommodate the tie rod handle and the tie rod seat.

[0024] The pull rod consists of an outer tube and an inner tube, enabling its telescopic function. The lower end of the outer tube is linked to a rotating sleeve, enabling a rotatable connection between the pull rod and the caster base. Furthermore, symmetrical through-holes are provided at both ends of the pull rod base, into which the upper end of the outer tube inserts, ensuring smooth extension and retraction of the pull rod. When the pull rod is secured to the housing, the first and second recesses accommodate the outer tube, the pull rod base, and the pull rod handle, respectively, ensuring a smooth, protruding surface for the housing, enhancing its aesthetics while also protecting the various components.

[0025] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of an embodiment of the utility model in a vertical use state;

[0027] Figure 2 This is a schematic diagram of a horizontal usage state of an embodiment of the utility model;

[0028] Figure 3 This is an exploded diagram of the lock seat of an embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the assembled state of the lock base according to an embodiment of the present utility model;

[0030] Figure 5 This is a schematic diagram of the unlocking block in a front view according to an embodiment of the present invention;

[0031] Figure 6 This is a left side schematic diagram of an unlocking block according to an embodiment of the present utility model;

[0032] Figure 7 This is an exploded view of the caster seat of an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of a tie rod seat according to an embodiment of the present utility model;

[0034] Figure 9 Schematic diagram of a pad according to an embodiment of the present invention.

[0035] Reference numerals: box body 1, first embedding groove 1a, second embedding groove 1b; caster seat 2, U-shaped rotating groove 2a, groove 2c; lock seat 3, sliding guide groove 3a, lock tongue hole 3b, connecting shaft 3c, boss 3d; lock tongue 4, hook body 4a, guide block 4b; unlocking block 5, push plate 5a, pull button 5b, convex strip 5c; torsion spring 6, pad 7; pull rod mechanism a, pull rod seat a1, keyhole a2, plug-in hole a3, rotating sleeve a4, rotating shaft a5, convex block a6, outer tube a7, inner tube a8, pull rod handle a9, matching hole a10. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] like Figures 1 to 9The wide-trolley lie-flat convertible suitcase shown includes a case body 1, a tie rod mechanism a distributed on the side of the case body 1, a caster mechanism installed on the side or bottom of the case body 1, the caster mechanism includes a caster seat 2 installed on the case body 1, the tie rod mechanism a includes a telescopic sliding tie rod, a tie rod seat a1 fixed on the tie rod, the lower end of the tie rod is rotatably connected to the caster seat 2, a lock seat 3 fixed to the case body 1 is provided between the tie rod and the case body 1, a lock tongue 4 is provided in the lock seat 3, a keyhole a2 adapted to the lock tongue 4 is provided on the tie rod seat a1, the lock tongue 4 is linked to an unlocking mechanism that can control the movement of the lock tongue 4, when the lock tongue 4 is inserted into the keyhole a2, the tie rod is fixed to the side of the case body 1; when the lock tongue 4 is disengaged from the keyhole a2, the tie rod can rotate around the rotation connection between the lower end and the caster seat 2. The unlocking mechanism controls the insertion and removal of the locking tongue 4 into the keyhole a2. When the locking tongue 4 is inserted into the keyhole a2, the pull rod is fixed to the side of the case 1 and cannot rotate about the caster seat 2. At this time, the case 1 is in an upright position. When the locking tongue 4 is removed from the keyhole a2, the lower end of the pull rod, due to its rotatable connection with the caster seat 2, can rotate relative to the case 1, allowing the suitcase to be converted from an upright to a horizontal position. This enhances the flexibility of the suitcase, allowing it to be flexibly switched between upright and horizontal positions, thereby improving its ease of use and making it adaptable to different usage scenarios, providing a good user experience whether dragging it in a flat position or pushing it in an upright position. Furthermore, "the lower end of the pull rod is rotatably connected to the caster seat 2". On the one hand, since the pull rod needs to be rotated when it is changed from a vertical state to a horizontal state, the hinge is prone to wear after repeated use, and replacing the caster seat 2 is simpler than replacing the box body 1, so it is convenient for later maintenance; on the other hand, the existence of a larger width between the caster seats 2 can further increase the width of the pull rod, improve the structural strength of the pull rod, and also facilitate people to better control the pull rod.

[0038] An unlocking block 5 is provided between the lock tongue 4 and the lock seat 3. A sliding guide groove 3a parallel to the pull rod seat a1 is provided on the lock seat 3. The upper part of the unlocking block 5 penetrates the sliding guide groove 3a and can move back and forth along the sliding guide groove 3a; the lock seat 3 is located on the side facing the pull rod seat a1 and is provided with a lock tongue hole 3b adapted to the lock tongue 4. The lower end of the lock tongue 4 is hinged with a connecting shaft 3c, and both ends of the connecting shaft 3c are installed on the lock seat 3; a hook body 4a is provided at the upper end of the lock tongue 4, and a push plate 5a is provided at the lower part of the unlocking block 5 corresponding to the hook body 4a. The push plate 5a is arranged obliquely to the sliding guide groove 3a, and a torsion spring 6 is provided on the outer periphery of the connecting shaft 3c. One end of the torsion spring 6 is linked to the lock tongue 4, and the other end is linked to the lock seat 3. Pushing the upper portion of the unlocking block 5 along the sliding guide groove 3a causes the push plate 5a to also move laterally. Since the push plate 5a is arranged at an angle relative to the sliding guide groove 3a, and the hook 4a of the lock tongue 4 maintains contact with the push plate 5a due to the action of the torsion spring 6, the hook 4a rotates about the connecting shaft 3c until it is pushed out of the lock tongue hole 3b and engages with the keyhole a2, thereby securing the pull rod seat a1. Pushing the unlocking block 5 in the opposite direction causes the hook 4a to automatically return to its original position due to the action of the torsion spring 6, allowing the hook 4a to exit the keyhole a2, unlocking the pull rod and allowing it to rotate about the castor seat 2, changing the use state of the suitcase.

[0039] A guide block 4b is also provided at the upper end of the lock tongue 4. This block and hook 4a are offset relative to the connecting shaft 3c, and a push plate 5a is interposed between them. The guide block 4b and hook 4a cooperate to guide the push plate 5a. Furthermore, during the reset process, the push plate 5a pushes the guide block 4b, assisting in the reset of the hook 4a. This improves the sensitivity of the lock tongue 4 and prevents it from failing.

[0040] The lock base 3 is equipped with several groups of bosses 3d, and the rod base a1 has a corresponding set of mating holes a10 for each group of bosses 3d. The bosses 3d are each provided with screw mounting holes. When the rod base a1 is secured to the case 1, not only does the hook 4a engage with the keyhole a2, but the bosses 3d also engage with the mating holes a10, strengthening the connection between the rod base a1 and the case 1.

[0041] The upper portion of the unlocking block 5 is provided with a toggle 5b integrally formed with the push plate 5a. The toggle 5b is mounted within the sliding guide groove 3a and can reciprocate within the sliding guide groove 3a. The lock base 3 is provided with unlocking indicators on both sides of the sliding guide groove 3a. The toggle 5b has anti-slip grooves on its surface, and a raised strip 5c is provided in the middle of the toggle 5b. The toggle 5b allows for manual control of the lateral movement of the unlocking block 5. The anti-slip grooves and raised strip 5c in the middle of the toggle 5b increase friction, making it easier to push the toggle 5b. The unlocking indicator helps users understand whether the lock is currently locked or unlocked.

[0042] The inner end surface of the box body 1 is provided with a backing plate 7 opposite to the lock seat 3, and the backing plate 7 is detachably connected to the box body 1 and the lock seat 3 in sequence by screws. The addition of the backing plate 7 improves the structural strength of the box body 1, especially at the position where the lock seat 3 is installed.

[0043] The lower end of the pull rod is provided with a rotating sleeve a4, which houses a rotating shaft a5. The caster base 2 is provided with a U-shaped rotating groove 2a that fits within the rotating sleeve a4. A plug hole a3 is provided on the side of the U-shaped rotating groove 2a. The end of the rotating shaft a5 extends toward the caster base 2 until it is inserted into the plug hole a3. When the lock tongue 4 exits the keyhole a2, the pull rod base a1 is no longer restrained. Manually pulling or pushing the pull rod causes the rotating sleeve a4 and the rotating shaft a5 to rotate relative to the caster base 2, causing the pull rod to rotate.

[0044] The side of the U-shaped rotating groove 2a is provided with several sets of grooves 2c spaced apart around the periphery of the insertion hole a3. The end of the rotating sleeve a4 is provided with protrusions a6 corresponding to the grooves 2c. The outer surface of the protrusions a6 is curved. A user applies a certain pushing or pulling force to the pull rod until the protrusions a6 separate from the grooves 2c. When the pull rod is rotated to the desired angle, the protrusions a6 engage with a set of grooves 2c, securing the pull rod at that angle. This ensures that the pull rod remains fixed at any rotation angle, enhancing the suitcase's usability. The curved surface of the protrusions a6 facilitates the separation and engagement of the protrusions a6 with the grooves 2c without excessive interference.

[0045] The pull rod comprises an outer tube a7 and an inner tube a8. The lower end of the outer tube a7 is linked to the rotating sleeve a4. The pull rod seat a1 has symmetrical through-holes at both ends. The upper end of the outer tube a7 is fixedly connected to the pull rod seat a1. The inner tube a8 passes through the through-hole and is inserted into the outer tube a7, telescopically cooperating with the outer tube a7. The upper end of the inner tube a8 is provided with a pull rod handle a9. A first insertion groove 1a is provided on the side of the housing 1, corresponding to the outer tube a7 and adapted to fit the outer tube a7. A second insertion groove 1b is provided above the side of the housing 1 to accommodate the pull rod handle a9 and the pull rod seat a1. The pull rod is composed of the outer tube a7 and the inner tube a8, realizing its telescopic function. The lower end of the outer tube a7 is linked to the rotating sleeve a4, achieving a rotatable connection between the pull rod and the caster seat 2. Furthermore, symmetrical through-holes are provided on both ends of the pull rod seat a1. The upper end of the outer tube a7 is inserted into the through-hole of the pull rod seat a1, ensuring smooth extension and retraction of the pull rod. When the pull rod is fixed to the box body 1, the first embedding groove 1a and the second embedding groove 1b can respectively accommodate the outer tube a7, the caster seat 2, and the pull rod handle a9, 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.

[0046] It should be noted that, except for the caster seat 2 (designed with a U-shaped groove), the rest of the caster mechanism is prior art and is not the invention of this application. Therefore, this embodiment will not be disclosed in detail. Users can choose casters that are easy to disassemble and assemble according to their needs. Four caster positioning points are provided on the side and bottom of the box body 1. When the suitcase needs to be used upright, the pull rod is rotated to fit the side of the box body 1, and then the unlocking block 5 is used to rotate the hook body 4a to insert into the keyhole a2, so that the pull rod seat a1 is locked on the box body 1. In this use state, the caster is installed on the bottom surface of the box body 1. When the suitcase needs to be used flat, the unlocking block 5 is used to withdraw the hook body 4a from the keyhole a2, the pull rod seat a1 is unlocked, and the pull rod is manually pushed or pulled to rotate the pull rod to the desired angle. In this use state, the caster is installed on the side of the box body 1.

Claims

1. A wide-trolley, lie-flat convertible suitcase comprising a suitcase body, a tie rod mechanism distributed on the side of the suitcase body, a caster mechanism mounted on the side or bottom of the suitcase body, the caster mechanism comprising a caster seat mounted on the suitcase body, the tie rod mechanism comprising a retractable and slidable tie rod, and a tie rod seat fixed to the tie rod, characterized in that: The lower end of the pull rod is rotatably connected to the caster seat, and a lock seat fixed to the box body is provided between the pull rod and the box body. A lock tongue is provided in the lock seat, and a keyhole adapted to the lock tongue is provided on the pull rod seat. The lock tongue is linked to an unlocking mechanism that can control the movement of the lock tongue. 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 caster seat.

2. The wide-trolley, lie-flat convertible luggage case according to claim 1, characterized in that: An unlocking block is provided between the lock tongue and the lock seat, 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 the sliding guide groove and can move back and forth along the sliding guide groove; the lock seat is located on the side facing the pull rod seat and is provided with a lock tongue hole adapted to the lock tongue, and the lower end of the lock tongue is hinged with a connecting shaft, and the two ends of the connecting shaft are installed on the lock seat; a hook body is provided at the upper end of the lock tongue, and a push plate is provided at the lower part of the unlocking block corresponding to the hook body, and the push plate is arranged obliquely to the sliding guide groove, and a torsion spring is provided on the outer periphery of the connecting shaft, one end of the torsion spring is linked with the lock tongue, and the other end is linked with the lock seat.

3. The wide-trolley, lie-flat convertible luggage case according to claim 2, characterized in that: A guide block is further provided at the upper end of the locking tongue. The guide block and the hook body are staggered relative to the connecting shaft, and the pushing plate is inserted between the guide block and the hook body.

4. The wide-trolley, lie-flat convertible luggage case according to claim 2, characterized in that: The lock seat is provided with a plurality of groups of bosses, and the pull rod seat is provided with a group of matching holes corresponding to each group of bosses; screw mounting holes for connecting screws are provided in the bosses.

5. The wide-trolley, lie-flat convertible luggage case according to claim 2, characterized in that: The upper part of the unlocking block is provided with a buckle integrally formed with the push plate. The buckle is installed in the sliding guide groove and can move back and forth in the sliding guide groove. The lock seat is provided with unlocking marks on both sides of the sliding guide groove. The surface of the buckle is provided with anti-slip grooves, and a convex strip is provided in the middle of the buckle.

6. The wide-trolley, lie-flat convertible luggage case according to claim 5, characterized in that: A backing plate opposite to the lock seat is installed on the inner end surface of the box body, and the backing plate is detachably connected to the box body and the lock seat in sequence through screws.

7. The wide-trolley lie-flat convertible luggage case according to any one of claims 1 to 6, characterized in that: The lower end of the pull rod is provided with a rotating sleeve, a rotating shaft is provided in the rotating sleeve, the caster seat is provided with a U-shaped rotating groove adapted to the rotating sleeve, a plug hole is provided on the side of the U-shaped rotating groove, and the end of the rotating shaft extends toward the caster seat until it is inserted into the plug hole.

8. The wide-trolley, lie-flat convertible luggage case according to claim 7, characterized in that: The side surface of the U-shaped rotating groove is provided with a plurality of grooves surrounding the outer periphery of the plug hole and arranged at intervals. The end of the rotating sleeve is provided with grooves and corresponding protrusions, and the outer surface of the protrusion is curved.

9. The wide-trolley, lie-flat convertible luggage case according to claim 7, characterized in that: The pull rod includes an outer tube and an inner tube. The lower end of the outer tube is linked to the 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 cooperates with the outer tube in telescopic manner. 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 that can accommodate the pull rod handle and the pull rod seat is provided on the upper side surface of the box body.

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