Integrated self-opening and self-closing staircase pull suitcase

Abstract

The present invention discloses an integrated self-opening and self-closing stair-climbing trolley case, which comprises a box body. A universal wheel is arranged at the bottom of the box body. The telescopic pull rod is arranged on one side of the box body. A one-way wheel is arranged at the bottom of the sliding plate. The inner tray is respectively connected to the telescopic pull rod and the box body. The limiting connecting rods on the left and right sides are movably connected to the inner tray through the first connecting rod and are movably connected to the sliding plate through the second connecting rod. The torsion spring connecting rods on the left and right sides are movably connected to the inner tray through the third connecting rod and are movably connected to the sliding plate through the fourth connecting rod. A double-rocker mechanism is formed among the limiting connecting rod, the box body, the torsion spring connecting rod and the sliding plate. One end of the elastic device is connected to the inner tray, and the other end is connected to the fourth connecting rod. The shock-absorbing device is arranged between the sliding plate and the inner tray. In the present invention, the sliding plate can self-open and self-close to assist in climbing stairs, and is provided with shock-absorbing and buffering devices, which not only avoid damage to the box body itself or fragile items inside, but also greatly reduce the noise and vibration during stair climbing.

Description

Technical Field

[0001] The present invention relates to the field of luggage, and more particularly to an integrated self-opening and self-closing staircase-climbing trolley case. Background Art

[0002] Trolley cases are essential tools for people traveling far. Most traditional trolley cases with pull rods can only be dragged on relatively flat roads. When going up and down stairs, they can only be carried by hand or on the shoulder, which is not only laborious but also time-consuming. Especially when the trolley case is particularly heavy, it is even more strenuous, and it is difficult to move forward smoothly or even unable to move at all.

[0003] At present, most of the trolley cases on the market that can facilitate going up and down stairs are of the six-wheel or single large-wheel type, with poor universality for steps of different slopes. For higher steps, a great deal of effort is required to pull, which is extremely laborious. Moreover, due to the absence of shock-absorbing and buffering devices, there is a lot of bouncing and noise during the process of climbing stairs, which is likely to cause greater damage to the trolley case itself or the fragile items inside. Especially, both the six-wheel and large-wheel types are directional wheels, which cannot be pushed but only pulled, not labor-saving, and their large volume affects the appearance and is not convenient for placement. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated self-opening and self-closing staircase-climbing trolley case.

[0005] To achieve the above purpose, the present invention adopts the following content:

[0006] The integrated self-opening and self-closing staircase-climbing trolley case includes a box body, universal wheels, a telescopic pull rod, a sliding plate, a single-direction wheel, an elastic device, a shock-absorbing device, a limit connecting rod, a torsion spring connecting rod, an inner tray, a first connecting rod, a second connecting rod, a third connecting rod, and a fourth connecting rod. Universal wheels are arranged at the bottom of the box body, and single-direction wheels are arranged at the bottom of the sliding plate. The telescopic pull rod is arranged on one side of the box body. The inner tray is respectively connected to the box body and the telescopic pull rod. The limit connecting rods on the left and right sides are movably connected to the inner tray through the first connecting rod and movably connected to the sliding plate through the second connecting rod. The torsion spring connecting rods on the left and right sides are movably connected to the inner tray through the third connecting rod and movably connected to the sliding plate through the fourth connecting rod. A double-rocker mechanism is formed among the limit connecting rod, the inner tray, the torsion spring connecting rod, and the sliding plate. One end of the elastic device is connected to the inner tray, and the other end is connected to the fourth connecting rod. The shock-absorbing device is arranged between the sliding plate and the inner tray. The sliding plate drives the single-direction wheel to move upward by the elastic force of the elastic device and the shock-absorbing device until the top of the limit connecting rod abuts against the inner tray, so that the sliding plate is in a normally closed state relative to the box body. At this time, the bottom horizontal line of the single-direction wheel is higher than the bottom horizontal line of the universal wheels. When the sliding plate is subjected to an external force, the sliding plate drives the single-direction wheel to move downward until the bottom of the torsion spring connecting rod abuts against the inner tray, so that the sliding plate is in an open state relative to the box body. At this time, the bottom horizontal line of the single-direction wheel is lower than the bottom horizontal line of the universal wheels.

[0007] Preferably, the elastic device is a tension spring or a rubber band.

[0008] Preferably, the shock-absorbing device is a torsion spring, and the torsion spring is sleeved on both ends of the third connecting rod.

[0009] Preferably, the cross-section of the skateboard is in a "U" shape, the box body is provided with notches adapted to both sides of the skateboard, both sides of the skateboard are clamped on the notches and form a receiving cavity with the box body, and the elastic device, the shock-absorbing device, the limiting connecting rod, the torsion spring connecting rod, the inner support, the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are all arranged in the receiving cavity.

[0010] Preferably, it further includes a shoulder strap. One end of the shoulder strap passes through the figure-eight buckle to form a large closed ring for shoulder cross-back, and the other end is connected to the top of the telescopic pull rod.

[0011] Preferably, a cavity is provided on the box body or the telescopic pull rod, and a mobile power bank is arranged in the cavity.

[0012] Preferably, the skateboard adopts a corrugated structure.

[0013] Preferably, arched bumps are arranged on both the left and right sides of the skateboard.

[0014] Preferably, a detachable wear-resistant strip is arranged on the arched bump, or a sliding groove is arranged on the arched bump, and a sliding strip is arranged in the sliding groove.

[0015] Preferably, buffer sponges or springs are arranged on both the top of the skateboard and the bottom of the inner support.

[0016] The present invention has the following advantages:

[0017] 1) The present invention can be freely pushed and pulled through the four universal wheels at the bottom of the box body on a smooth road surface, which is quite labor-saving. When passing through complex road conditions such as gravel roads, dirt roads, and mountain roads, it is switched to a single-direction wheel and towed forward. The single-direction wheel has a larger bearing and is more stable in orientation, unlike the universal wheel that will bounce back and forth on a bumpy ground. When encountering steps or stairs, it can directly use the skateboard and the single-direction wheel under the skateboard to cooperate with each other to quickly pass through. The present invention is simple to operate and convenient to use, and is suitable for various complex road conditions, facilitating people's travel;

[0018] 2) When going up or down stairs, the present invention uses the tension spring, torsion spring and buffer sponge to play a shock-absorbing and buffering function, which will not cause great damage to the suitcase itself or the fragile items inside, nor will it generate much noise and vibration;

[0019] 3), The present invention uses a skateboard to climb stairs. Since the skateboard has a larger span, the cutting angle can be changed by raising or lowering the telescopic pull rod, thus meeting stairs with various slopes.

[0020] 4), In the present invention, devices such as the skateboard can be hidden under the lower part of the rear panel of the box body. When in the normally closed state, the skateboard and the box body are integrated as one, and it is difficult to tell the difference from an ordinary trolley case from the appearance, making it more beautiful.

[0021] 5), In the present invention, a shoulder strap used in combination with the telescopic pull rod is provided. When the luggage is overweight, the shoulder strap is looped around the handle of the pull rod, and then carried on the shoulder like a bag, using the shoulder to assist in dragging the trolley case up and down the stairs. On flat ground, it can also be carried on the shoulder to drag the trolley case and slide, and this unique design is both labor-saving and liberates our hands, greatly facilitating people's travel. Brief Description of the Drawings

[0022] The following further elaborates in detail on the specific implementation manners of the present invention in conjunction with the drawings.

[0023] Figure 1 is the overall structural schematic diagram of the integrated self-opening and self-closing stair-climbing trolley case of the present invention;

[0024] Figure 2 is the partial side view of the integrated self-opening and self-closing stair-climbing trolley case of the present invention;

[0025] Figure 3 is the partial rear view of the integrated self-opening and self-closing stair-climbing trolley case of the present invention;

[0026] Figure 4 is the state diagram of the skateboard of the integrated self-opening and self-closing stair-climbing trolley case of the present invention when the skateboard enters the notch facing inwards and downwards relative to the box body during stair climbing;

[0027] Figure 5 is the open state diagram of the skateboard of the integrated self-opening and self-closing stair-climbing trolley case of the present invention when the skateboard is relative to the box body during stair climbing;

[0028] Figure 6 is the application diagram of the integrated self-opening and self-closing stair-climbing trolley case of the present invention using single-direction wheels for operation on flat ground;

[0029] Figure 7 is the application diagram of the integrated self-opening and self-closing stair-climbing trolley case of the present invention using universal wheels for operation on flat ground;

[0030] Figure 8 is the structural schematic diagram of the skateboard of the integrated self-opening and self-closing stair-climbing trolley case of the present invention in Embodiment 1;

[0031] Figure 9 is the structural schematic diagram of the rear panel of the box body in the integrated self-opening and self-closing stair-climbing trolley case of the present invention;

[0032] Figure 10 is a schematic structural view of the inner tray in the integrated self-opening and self-closing staircase-climbing trolley case of the present invention;

[0033] Figure 11 is a schematic structural view of the sliding plate in the integrated self-opening and self-closing staircase-climbing trolley case of the present invention in the second embodiment.

[0034] In the figure, each reference numeral is as follows:

[0035] 1 - box body, 2 - telescopic pull rod, 3 - universal wheel, 4 - sliding plate, 401 - arched convex block, 402 - detachable wear-resistant strip, 403 - chute, 404 - sliding strip, 5 - single-direction wheel, 6 - elastic device, 7 - shock-absorbing device, 8 - limiting connecting rod, 9 - torsion spring connecting rod, 10 - first connecting rod, 11 - second connecting rod, 12 - third connecting rod, 13 - fourth connecting rod, 14 - shoulder strap, 15 - D-ring, 16 - cavity, 17 - buffer sponge, 18 - inner tray, 19 - hook, 20 - notch, 21 - accommodating cavity. Detailed implementation manners

[0036] In order to more clearly illustrate the present invention, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] Embodiment 1

[0040] As Figures 1 to 10As shown in the figure, the integrated self-opening and self-closing staircase-climbing trolley case of this embodiment includes a box body 1, a telescopic pull rod 2, universal wheels 3, a sliding plate 4, one-way wheels 5, an elastic device 6, a shock-absorbing device 7, a limit connecting rod 8, a torsion spring connecting rod 9, a first connecting rod 10, a second connecting rod 11, a third connecting rod 12, a fourth connecting rod 13 and an inner support 18. Universal wheels 3 are arranged at the bottom of the box body 1, and one-way wheels 5 are arranged at the bottom of the sliding plate 4. The telescopic pull rod 2 is arranged on one side of the box body 1. Since the box body 1 adopts the thermoforming process and cannot be locally thickened, an inner support is installed between the box body and the telescopic pull rod. One side of the inner support 18 is fixedly connected to the bottom support of the telescopic pull rod 2 by screws or rivets, and the other side is connected to the bottom of the box body 1 and is supported by the inner support. The limit connecting rods 8 on the left and right are movably connected to the inner support 18 through the first connecting rod 10 and movably connected to the sliding plate 4 through the second connecting rod 11. The torsion spring connecting rods 9 on the left and right are movably connected to the inner support 18 through the third connecting rod 12 and movably connected to the sliding plate 4 through the fourth connecting rod 13. The first connecting rod 10, the second connecting rod 11, the third connecting rod 12 and the fourth connecting rod 13 all adopt long rolling pin dowels. The 4 long rolling pin dowels are used as connecting parts to connect the sliding plate 4, the limit connecting rod 8, the torsion spring connecting rod 9 and the inner support 18, so as to form a double-rocker structure among the limit connecting rod 8, the inner support 18, the torsion spring connecting rod 9 and the sliding plate 4, ensuring that the limit connecting rod 8 and the torsion spring connecting rod 9 can transmit motion and torque. The shock-absorbing device 7 adopts a torsion spring or can also adopt a spring. The torsion spring is sleeved at both ends of the third connecting rod 12. The elastic device 6 adopts a tension spring. A hook is arranged at the middle position of the inner support. One end of the tension spring is connected to the hook on the inner support, and the other end is connected to the middle of the fourth connecting rod 13. The sliding plate 4 drives the one-way wheel 5 to move upward by the elastic force of the tension spring and the torsion spring until the top of the limit connecting rod 8 abuts against the inner support, so that the sliding plate 4 is in a closed state relative to the box body 1. At this time, the bottom horizontal line of the one-way wheel 5 is higher than the bottom horizontal line of the universal wheel 3; when the sliding plate 4 is under the action of an external force, the sliding plate 4 drives the one-way wheel 5 to move downward until the bottom of the torsion spring connecting rod 9 abuts against the inner support, so that the sliding plate 4 is in an open state relative to the box body 1. At this time, the bottom horizontal line of the one-way wheel 5 is lower than the bottom horizontal line of the universal wheel 3. In order to prevent the universal wheel from being hung during the staircase-climbing process and additionally increasing the friction force, the base of the universal wheel 3 close to the one-way wheel can adopt the way of widening the offset axis or the way of moving the whole universal wheel forward, so that the wheels of the universal wheel are far away from the one-way wheel. That is to say, only the one-way wheel participates in the activity during the staircase-climbing process, and the universal wheel does not participate, so that the sliding will be smoother and more stable.

[0041] In the integrated self-opening and self-closing staircase-climbing trolley case of this embodiment, the cross-section of the sliding plate 4 is in a "U" shape. A notch 20 adapted to the two sides of the sliding plate 4 is formed on the case body 1. When the sliding plate 4 is in a normally closed state relative to the case body 1, the two sides of the sliding plate 4 are clamped in the notch 20 and a receiving cavity 21 is formed between the sliding plate 4 and the case body 1. The elastic device 6, the shock-absorbing device 7, the limiting connecting rod 8, the torsion spring connecting rod 9, the inner support 18, the first connecting rod 10, the second connecting rod 11, the third connecting rod 12 and the fourth connecting rod 13 are all arranged in the receiving cavity 21. When in the normally closed state, the sliding plate and the case body are integrated, and it is very difficult to tell the difference from an ordinary trolley case from the appearance, which is more beautiful.

[0042] In the integrated self-opening and self-closing staircase-climbing trolley case of this embodiment, it further includes a shoulder strap 14. One end of the shoulder strap 14 sequentially passes through a protective pad made of flexible material and a Japanese character buckle 15 to form a large closed ring for shoulder carrying, and is fixed by a double-sided rivet. The other end of the shoulder strap 14 is folded and fixed by a double-sided rivet to form a small closed ring. When in use, according to the height of different users, the length of the shoulder strap 14 is adjusted through the Japanese character buckle 15. The large closed ring part of the shoulder strap 14 is wound around the top handle of the telescopic pull rod 2 and passes out through the small closed ring, so that the shoulder strap 14 is temporarily movably connected to the telescopic connecting rod 2. The trolley case is dragged up and down the stairs through the shoulder strap 14. On flat roads, it can also be carried on the shoulder like a bag and the trolley case is dragged to slide, which is labor-saving and liberates both hands. When not in use, the shoulder strap 14 can also be taken off from the telescopic pull rod 2. After being folded, the shoulder strap 14 is only as big as a lighter, which is convenient to carry. However, it is not limited to this. The other end of the shoulder strap 14 can be directly tied to the top of the telescopic pull rod 2, or movably connected to the telescopic pull rod 2 by means of snap buttons, hooks, etc.

[0043] In the integrated self-opening and self-closing staircase-climbing trolley case of this embodiment, a cavity capable of inserting a mobile power bank is provided on the top cover of the telescopic pull rod, and the mobile power bank is used to charge the mobile phone.

[0044] In the integrated self-opening and self-closing staircase-climbing trolley case of this embodiment, the sliding plate 4 adopts a corrugated structure. The corrugated structure is composed of many small arches. The small arches can decompose and transmit the force received downward and to the left and right directions. Due to the adoption of the corrugated structure, the bending and impact resistance of the sliding plate 4 is improved. The thickness of the sliding plate 4 in this embodiment is about 2 millimeters, which greatly reduces the weight and cost of the sliding plate. However, it is not limited to this, and the actual thickness can be adjusted according to customer requirements.

[0045] In the integrated self-opening and self-closing staircase-climbing suitcase of this embodiment, arched bumps 401 are provided on both the left and right sides of the sliding plate 4. The two arched bumps 401 are slightly higher than the small arched part in the middle, reducing resistance and making the sliding smoother. It can also prevent the middle of the sliding plate 4 from contacting obstacles, avoiding scratching the sliding plate 4 and thus the need to replace the entire sliding plate 4. Removable wear-resistant strips 402 can be installed on the arched bumps 401 on both sides of the sliding plate 4, so that instead of replacing the whole sliding plate 4, only the removable wear-resistant strips 402 need to be replaced. The sliding plate 4 is designed to be straight or arc-shaped. The material of the sliding plate 4 can be made of wear-resistant materials with low friction coefficients such as polytetrafluoroethylene, upe, nylon, etc.

[0046] In the integrated self-opening and self-closing staircase-climbing suitcase of this embodiment, a buffer sponge 17 is provided on the top of the sliding plate 4. During the process of climbing stairs, the top of the sliding plate 4 will collide with the box body 1, and the buffer sponge 17 is interposed between the sliding plate and the box body to play a role in buffering and shock absorption; a buffer sponge 17 is also provided at the bottom of the inner support 18, which is also to buffer the impact force of the torsion spring link 9 on the inner support 18, absorb kinetic energy and reduce noise.

[0047] Usage method:

[0048] When climbing stairs, the opening and closing of the sliding plate 4 are automatically controlled by using the transfer of the center of gravity and the force application point. When dragging the suitcase up the stairs, the force application point of the suitcase instantaneously transfers from the single-direction wheel 5 to the front end of the sliding plate 4. Under the gravity impact of the suitcase, the sliding plate 4 moves inward and downward to unload the force ( Figure 4 ), at this time, the two sides of the sliding plate 4 enter the notch 20, and only the top buffer sponge 17 of the sliding plate 4 contacts the rear part of the box body 1, and the buffer sponge 17 compresses to relieve the impact. After climbing one step, the force application point of the suitcase transfers from the front end of the sliding plate 4 to the single-direction wheel 5 again. Under the gravity and forward pulling force of the suitcase, the sliding plate 4 automatically opens, and the top end of the sliding plate 4 begins to contact the second step ( Figure 5 ), and this process repeats in a cycle. Every time one step is climbed, the sliding plate 4 automatically opens and closes once, similar to playing on a seesaw. This unique shock absorption method greatly relieves the impact force of the steps on the suitcase. When going down the stairs, the suitcase is in the front and the person is behind pushing it downstairs, and the shock absorption method is the same.

[0049] When walking on flat ground, stand the suitcase upright. The force application point of the suitcase transfers from the single-direction wheel 5 to the four universal wheels 3. Under the action of the tension spring and the torsion spring, the sliding plate 4 moves upward and returns to the normally closed state. At this time, the suitcase can be pushed forward horizontally ( Figure 7 ), or it can be pulled ( Figure 6) When being pulled on a flat road, the skateboard 4 will not open because the stress point of the trolley case is at the bottom of the single-direction wheel 5 at this time. The skateboard 4 receives an upward acting force, and the tops of the two limit link rods 8 abut against the top of the inner support 18, and the skateboard 4 will not move upward continuously, making the skateboard 4 in a closed state relative to the box body 1. Only when the stress point is above the top of the single-direction wheel 5 and the skateboard 4 is under an external force, the skateboard 4 will open, that is to say, there must be a height difference on the ground. For example, when encountering complex road conditions such as steps and potholes, the skateboard 4 will automatically open to help people quickly cross the obstacles.

[0050] Embodiment 2

[0051] As Figure 11 shown, the difference between this embodiment and Embodiment 1 is that in the present invention, a chute 403 for inserting a slide bar 404 is designed on the arched convex block 401, so that the slide bar 404 can be regularly drawn out and replaced, and the operation is more convenient and efficient.

[0052] Obviously, the above are the embodiments of the integrated self-opening and self-closing stair-climbing trolley case of the present invention. The above embodiments are only examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation manners here. Any obvious changes or modifications derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. Integrated self-opening and self-closing staircase pull-up suitcase, Characterized in that, It includes a box body, universal wheels, a telescopic pull rod, a sliding plate, a single-direction wheel, an elastic device, a shock-absorbing device, a limit connecting rod, a torsion spring connecting rod, an inner support, a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod. Universal wheels are provided at the bottom of the box body, and single-direction wheels are provided at the bottom of the sliding plate. The telescopic pull rod is arranged on one side of the box body. The inner support is respectively connected to the box body and the telescopic pull rod. The limit connecting rods on the left and right sides are movably connected to the inner support through the first connecting rod and movably connected to the sliding plate through the second connecting rod. The torsion spring connecting rods on the left and right sides are movably connected to the inner support through the third connecting rod and movably connected to the sliding plate through the fourth connecting rod. A double-rocker mechanism is formed among the limit connecting rod, the inner support, the torsion spring connecting rod and the sliding plate. One end of the elastic device is connected to the inner support, and the other end is connected to the fourth connecting rod. The shock-absorbing device is arranged between the sliding plate and the inner support. The sliding plate drives the single-direction wheel to move upward under the elastic force of the elastic device and the shock-absorbing device until the top of the limit connecting rod abuts against the inner support, so that the sliding plate is in a normally closed state relative to the box body. At this time, the bottom horizontal line of the single-direction wheel is higher than the bottom horizontal line of the universal wheels; when the sliding plate is subjected to an external force, the sliding plate drives the single-direction wheel to move downward until the bottom of the torsion spring connecting rod abuts against the inner support, so that the sliding plate is in an open state relative to the box body. At this time, the bottom horizontal line of the single-direction wheel is lower than the bottom horizontal line of the universal wheels.

2. The integrated self-opening and self-closing staircase pull-up suitcase according to claim 1, Characterized in that, The elastic device is a tension spring or a rubber band.

3. The integrated self-opening and self-closing staircase pull-up suitcase according to claim 1, Characterized in that, The shock-absorbing device is a torsion spring, and the torsion spring is sleeved at both ends of the third connecting rod.

4. The integrated self-opening and self-closing staircase pull-up suitcase according to claim 1, Characterized in that, The cross-section of the sliding plate is in a "U" shape. A notch adapted to both sides of the sliding plate is opened on the box body. Both sides of the sliding plate are clamped on the notch and form a receiving cavity with the box body. The elastic device, the shock-absorbing device, the limit connecting rod, the torsion spring connecting rod, the inner support, the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are all arranged in the receiving cavity.

5. The integrated self-opening and self-closing staircase pull-up suitcase according to claim 1, Characterized in that, It further includes a shoulder strap. One end of the shoulder strap passes through a Japanese character buckle to form a large closed ring for shoulder carrying, and the other end is connected to the top of the telescopic pull rod.

6. The integrated self-opening and self-closing staircase pull-up suitcase according to claim 1, Characterized in that, A cavity is provided on the box body or the telescopic pull rod, and a mobile power bank is arranged in the cavity.

7. The integrated self-opening and self-closing staircase pull-up suitcase according to claim 1, Characterized in that, The sliding plate adopts a corrugated structure.

8. The integrated self-opening and self-closing staircase pull-up suitcase according to claim 1, Characterized in that, Arc-shaped convex blocks are provided on both the left and right sides of the sliding plate.

9. The integrated self-opening and self-closing staircase pull-up suitcase according to claim 8, Characterized in that, A detachable wear-resistant strip is provided on the arched bump, or a chute is provided on the arched bump, and a sliding strip is provided in the chute.

10. The integrated self-opening and self-closing stair-climbing trolley case according to any one of claims 1 to 9, characterized in that buffer sponges or springs are provided at the top of the sliding plate and the bottom of the inner support.

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