Rolling suitcase made of foam material

Abstract

A rolling suitcase made of foam material, comprising a suitcase body with an opening and a lid covering the opening, characterized in that That both the lid and the case body are made of foam material; And that fastening elements are arranged on the side walls of the case body or at the connecting points of adjacent side walls, which act on a reinforcing surface of the case body.

Description

REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese Utility Model Application No. 202421784232.6, filed on July 26, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The utility model relates to the field of suitcases, in particular to a rolling suitcase made of foam material. STATE OF THE ART

[0003] Rigid-material hard-shell suitcases are pieces of travel luggage with specific material properties, whose case bodies exhibit high rigidity and dimensional stability. They are particularly suitable for long-distance travel and business trips where bulky or heavy items need to be transported. The robust case body effectively protects contents and withstands rough handling during transport.

[0004] There are many different materials for hard-shell suitcases; common variants include polycarbonate (PC), acrylonitrile butadiene styrene copolymer (ABS), and aluminum alloys. These materials possess high hardness and strength, which allows them to meet the pressure and impact resistance requirements of hard-shell suitcases. Currently, either plastic blister trays or aluminum alloy trays dominate the market. Plastic blister trays are usually made of plastic, and their main disadvantages are low abrasion resistance, limited weather resistance, a tendency to deform at high temperatures, and embrittlement and breakage at low temperatures. They are also prone to fingerprints and dirt adhesion, while long-term use leads to yellowing, which impairs aesthetics.Aluminum alloy trays, on the other hand, are primarily heavy, make transport more difficult, and incur higher manufacturing costs. Impacts often result in permanent dents that are difficult to repair and detract from the appearance. Like plastic blister trays, they are highly prone to fingerprints and grease, are difficult to clean, and their rigid construction offers little vibration protection for the contents. Furthermore, aluminum alloys are sensitive to temperature fluctuations, leading to thermal expansion or contraction at extreme temperatures. CONTENT OF THE PRESENT UTILITY MODEL

[0005] The purpose of this utility model application is to provide a rolling suitcase made of foam material to solve the technical problems mentioned.

[0006] The technical solution to achieve the purpose of the utility model includes: The utility model provides a rolling suitcase made of foam material, comprising a suitcase body with an opening and a lid for covering the opening, the lid and the suitcase body being made of foam material; Fastening elements are arranged on the side walls of the suitcase body or at the joints of adjacent side walls, which act on a reinforcing surface of the suitcase body;

[0007] Further characterized in that the foam material is made of EPP and the lid is rotatably connected to the case body;

[0008] Further characterized in that a buffer component is arranged on the case body or lid, wherein the buffer component comprises a bottom shell;

[0009] Further characterized in that castors are provided, the base shell is arranged on an underside of the case body and the castors are firmly connected to the base shell.

[0010] Further characterized in that the base shell is fixed to the case body by means of a base shell lock;

[0011] Further characterized in that there are a plurality of fastening elements distributed around the case body perimeter with spaces between adjacent fastening elements, said fastening elements being recessed into side walls or joints to reinforce the side walls; the lid is provided with a lid metal frame around its perimeter and the case body is provided with a case body metal frame around its perimeter;

[0012] Further characterized in that the lid metal frame is fixed to the lid and the case body metal frame is positioned opposite the lid, wherein the lid is closed when the metal frames contact; the case body metal frame is connected to the fastening elements to realize the relative fastening of the case body and the case body metal frame.

[0013] Further characterized in that an additional compartment with a rotatably connected additional compartment cover is provided on the case body, between which a locking mechanism for locking the additional compartment cover is arranged;

[0014] Further characterized in that the locking mechanism comprises a button, a switching lever, a switching block, a slider, a return component, a locking block, and a locking groove; wherein the actuating button has a slotted opening in the horizontal direction, which serves to receive the switching lever when the button is actuated; wherein the switching piece is arranged in the interior of the case body and is connected to the switching lever by fastening means, whereby the switching lever can change between a first position and a second position by means of the switching piece; wherein the slider has a first inclined surface and a second inclined surface, and a sliding rod is fixedly attached to the locking block; wherein the first inclined surface of the slider bears against the lower edge of the button on both sides in a force-transmitting manner, and the second inclined surface of the slider bears against the sliding rod in a force-transmitting manner.wherein the locking groove is arranged on the auxiliary compartment cover and engages with the locking block to thereby lock the auxiliary compartment cover;

[0015] Further characterized in that at least one carrying handle is fixed laterally to the case body and a telescopic handle arranged on both sides is provided.

[0016] Compared to the state of the art, the utility model has the following advantages: The case body and the lid of the utility model are made of EPP material; in combination with a lid metal frame fixed to the lid and a case body metal frame anchored in the case body by embedded sheet metal parts, the low shear strength of EPP is compensated.

[0017] The excellent weather resistance of the EPP material allows for use in extreme temperatures. Compared to aluminum shells, the EPP hard-shell case offers significantly lower production costs, significantly outperforms plastic blister trays and aluminum versions in terms of impact resistance, and its reduced weight facilitates transport. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings forming part of the application serve to further understand the utility model solution. The schematic embodiments and their explanations explain the utility model but do not constitute an undue limitation. In the attached drawing: Fig. 1 is a perspective view of the rolling suitcase made of foam material provided by the utility model; Fig. 2 is a front view of the suitcase body provided by the utility model; Fig. 3 is a sectional view along AA in Fig. 2, which is provided by the utility model; Fig. 4 is an enlarged section B in Fig. 3, which is provided by the utility model; Fig. 5 is a schematic structural diagram of the fastener provided by the utility model; Fig. 6 is a schematic representation of the connection between the base shell and the rollers provided by the utility model; Fig. 7 is a schematic structural diagram of the additional compartment provided by the utility model; Fig. 8 is a sectional view of the auxiliary compartment provided by the utility model; Fig. 9 is a sectional view of the locking mechanism on the suitcase body provided by the utility model; Fig. 10 is an enlarged section C in Fig. 9, which is provided by the utility model; Fig. 11 is a schematic structural diagram of the auxiliary compartment and the locking mechanism provided by the utility model; Fig. 12 is an exploded view of the auxiliary compartment and locking mechanism provided by the utility model; Fig. 13 is an enlarged section D in Fig. 12, which is provided by the utility model; Fig. 14 is a schematic structural diagram of the locking mechanism provided by the utility model.

[0019] In the figures: Case body (1); Lid (2); Carrying handle (3); Telescopic handle (4); Casters (5); Case body metal frame (6); Lid metal frame (7); Fastening element (8); First embedding element (801); Second embedding element (802); Extension part (803); Through hole (804); Base tray (9); Base tray lock (10); Additional compartment (11); Additional compartment cover (12); Locking mechanism (13); Operating button (131); Switch lever (132); Switch piece (133); Slider (134); First inclined surface (1341); Second inclined surface (1342); Return unit (135); Fixed block (1351); Return spring (1352); Locking block (136); Slide rod (1361); Locking groove (137). DETAILED DESCRIPTION

[0020] The technical solutions of the embodiments of the utility model are described clearly and completely below with reference to the attached drawings. It is self-evident that the described embodiments represent only a portion of the embodiments of the utility model and do not encompass all possible embodiments. The following description of at least one exemplary embodiment serves solely for illustrative purposes and should in no way be interpreted as a limitation of the utility model or its possible applications. All other embodiments that a person skilled in the art can derive from the embodiments described in this utility model without inventive step also fall within the scope of protection of this utility model.

[0021] It should be noted that the terms used in this specification are for the sole purpose of explaining specific embodiments and are not intended to limit the exemplary embodiments of this application. Unless the context expressly indicates otherwise, the use of the singular form also includes the plural. Furthermore, it should be understood that the terms "comprise" and / or "include" used in this specification indicate the presence of the stated features, steps, operations, parts, components, and / or combinations thereof, but do not preclude the presence or addition of further features or steps.

[0022] Unless expressly stated otherwise, the relative arrangements of components, numerical expressions, and values ​​described in these embodiments do not limit the scope of this utility model. At the same time, it should be understood that the dimensions of the individual parts shown in the drawings are not to scale. Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but are intended to be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values ​​are to be considered exemplary and not limiting. Therefore, other examples of the embodiments may have different values.It should be noted that similar reference numerals and letters in the following drawings indicate similar elements, so that an element once defined in one drawing does not need to be further explained in subsequent drawings.

[0023] With reference to Fig. 1, the present utility model embodiment provides a rolling suitcase made of foam material, comprising a suitcase body 1 with an opening and a lid 2 covering the opening, wherein the lid 2 is rotatably connected to the suitcase body 1 via a hinge device and a buffer unit is arranged on the suitcase body 1 or lid 2. Both the lid 2 and the suitcase body 1 are made of foam material such as EPP (expanded polypropylene), PS (polystyrene), PU (polyurethane), PE (polyethylene), or PVC (polyvinyl chloride). In this embodiment, the lid 2 and the suitcase body 1 are made of EPP. This is a high-performance, highly crystalline polymer / gas composite material that, due to its unique properties, has become the fastest-growing, environmentally friendly pressure-damping and insulation material currently available.EPP products are characterized by excellent shock-absorbing properties, high shape recovery after deformation, remarkable heat resistance, chemical and oil resistance, and thermal insulation properties; in addition, the low weight of EPP enables a significant reduction in the weight of the luggage.

[0024] The wall thickness of the case body is 5 to 20 times that of conventional cases. If the thickness is too thin, molding would be impossible, the strength would fall below test standards, and practical requirements would not be met. State-of-the-art aluminum cases have wall thicknesses of 5-6 mm with an empty weight of over 4.5 kg, while PC cases with a thickness of 1-2 mm weigh at least 4 kg. In this embodiment, however, the EPP case body and EPP lid achieve a total empty weight of less than 4 kg with a thickness of 20-25 mm (preferably 25 mm). Thus, an overall weight reduction is achieved despite the significantly increased wall thickness.

[0025] See Fig. 2- Fig. 5. In this exemplary embodiment, fastening elements 8 are arranged on the side walls of the case body 1 or at the connecting points between adjacent side walls. The adjacent side walls refer to the connecting point between two connected side walls of the case body 1. The fastening elements 8 act on the reinforcing surface of the case body 1 in order to increase the strength of its side walls. The fastening elements 8 are embedded in the side walls of the case body 1 during manufacture. The fastening element 8 is preferably a recessed sheet metal part and comprises a first embedding element 801, a second embedding element 802 and an extension part 803. Several fastening elements 8 are distributed around the circumference of the side walls of the case body 1, with a distance existing between adjacent fastening elements 8.The fastening elements 8 are embedded in the side walls of the case body 1 or at the connecting points of adjacent side walls in order to reinforce the side walls.

[0026] See Fig. 1 and Fig. 2. A lid metal frame 7 is firmly attached to the lid 2, while a case body metal frame 6 is fixed to the case body 1 in position opposite the lid 2. Upon contact of the lid metal frame 7 with the case body metal frame 6, the lid 2 closes the case body 1. The case body metal frame 6 is connected to the fastening elements 8 to ensure relative fixation between the case body 1 and the case body metal frame 6. Furthermore, according to Fig. 2. The case body metal frame 6 rests against the extension part 803 of the case body 2 and is connected to it by fasteners. The case body metal frame 6 is preferably made of aluminum. Conventional aluminum frames require riveting from the outside with counter-fasteners on the inside, which leaves visible rivet heads on the exterior of the case body 1 and impairs its appearance. In addition, EPP material has a less favorable shear Poisson ratio compared to PC and aluminum alloys, making direct rivet fastening impossible. Embedding multiple fasteners 8 on side walls or connection points of the case body 1. The extension part 803 of the fasteners 8 has a through-hole 804. Countersunk screws fasten the case body metal frame 6 through the hole 804.When a sealing strip is attached to the frame, the screw head is concealed. The result is no visible fastening elements on the outside, creating an aesthetically pleasing appearance. The lid metal frame 7 preferably runs around the lid circumference, and the case body metal frame 6 runs around the case body 1.

[0027] With reference to Fig. 6, the buffer unit in this embodiment comprises a base shell 9, which is arranged on the underside of the case body 1. The buffer unit prevents the case body 1 from being penetrated by sharp objects and causing dents, as these both impair the aesthetics and reduce strength.

[0028] See also Fig. 6. To facilitate the movement of the case body 1, the EPP hard-shell case design additionally features casters 5. A base plate 9 is permanently installed on the underside of the case body 1 in the area of ​​the casters 5, with the casters 5 being firmly connected to the base plate 9. Preferably, the casters 5 are connected to the base plate 9. Since the case body 1 made of EPP material has a lower material hardness, it can easily be penetrated by sharp objects, resulting in unsightly dents, and also exhibits certain strength deficits. Under impact loads, the casters 5 can easily damage the case body 1.The additional base plate 9 on the underside of the case body 1 therefore serves both to protect against penetration by sharp objects when pulling the case, as well as to integrally connect the roller bearing and base plate into a structural unit, thereby significantly increasing the overall strength of the case body 1. In alternative embodiments (not shown in the figures), two or more rollers 5 can be arranged.

[0029] Furthermore, according to Fig. 6 is the case body 1 contains a bottom shell lock 10. Bottom shell 9 and bottom shell lock 10 are fixed together by means of screws to the case body 1.

[0030] See Fig. 7: In the present embodiment, the case body 1 has at least one carrying handle 3, which is fixed directly or indirectly to the side wall of the case body 1 by means of screws or rivets. Due to the considerable material thickness of the EPP case body 1, the carrying handle 3 is equipped with an ergonomically shaped recessed grip, which allows for comfortable gripping and carrying. In alternative embodiments (not shown in the figures), multiple carrying handles 3 can be provided, for example, one carrying handle 3 in each of the upper areas of the left and right side walls of the case body.

[0031] See Fig. 7 and Fig. 8: Due to the relatively thick walls of the EPP case body 1, attaching the telescopic handle 4 is difficult. A central arrangement of the telescopic handle 4 in the middle of the case body 1 would impair the space utilization efficiency. Therefore, in this embodiment, the telescopic handle 4 is arranged laterally on both sides of the case body 1 and enclosed on all sides by the case body 1. This arrangement ensures both an attractive appearance of the case and optimized space utilization of the case body 1. The EPP hard-shell case also includes the telescopic handle 4, which is located on both sides of the case body 1.

[0032] The telescopic handle 4 is located in the suitcase body 1 and forms a concave hollow space with the suitcase body 1, forming an auxiliary compartment between this hollow space and the auxiliary compartment cover 12 pivotally connected to the suitcase body 1. In the prior art, the relative position where the telescopic handle 4 is mounted in the suitcase body is generally blocked by a cloth or the like, resulting in the space there being unusable, but the adjustment method of this embodiment can make good use of this space. In the prior art, the telescopic handles are usually arranged on the inside of the suitcase body and occupy a space, making this space unusable.In this design, the telescopic handle is arranged on both sides of the suitcase body, and there is enough space in the middle to form a separate compartment for computers, mobile phones, and other supplies. This allows for quick access to items, such as when passing through aircraft security checkpoints. The laptop can be removed separately for inspection.

[0033] In this embodiment, the suitcase body 1 and the lid 2 are provided with a first locking assembly for controlling the opening or closing of the lid 2, and a second locking assembly for controlling the opening or closing of the lid of the auxiliary compartment 12 is provided between the lid of the auxiliary compartment 12 and the suitcase body 1. The first locking component and the second locking component may be the same or different. For example, the conventional locking component may use a zipper. At this time, the buttons of the suitcase body 1 and the auxiliary compartment 11 can be controlled separately. It can also be realized by snapping and locking. The opening and closing of the suitcase body 1 or the auxiliary compartment 11.

[0034] With reference to the Fig. 9 to 14, the second locking arrangement in this embodiment is a locking mechanism 13, which locks the auxiliary compartment 11 to ensure the security of valuables such as computers. The locking mechanism 13 includes a button 131, a switching lever 132, a switching piece 133, a sliding piece 134, a return member 135, a locking piece 136, and a locking groove 137.

[0035] With reference to Fig. 13 and Fig.14, in this embodiment, the button 131 is provided with a recess in the horizontal direction to accommodate the switching lever 132 when the button 131 is pressed. The switching piece 133 is arranged inside the case body 1 and connected to the switching lever 132 via fasteners. The switching lever 132 can be switched between the first position and the second position by means of the switching piece 133: When the switching lever 132 is in the first position, the locking mechanism 13 is in a locked state. At this time, the switching lever 132 touches the lower edge of the button 131, preventing the button 131 from moving downward; when the switching lever 132 is in the second position, the locking mechanism 13 is in an unlocked state.At this time, the switching lever 132 is located under the recess of the button 131. The button 131 can be moved downward, and the switching lever 132 is received in the recess after being pressed. After opening the lid 2, the user can directly observe the switching piece 133 inside the case body 1. By moving the switching piece 133 left and right, the switching lever 132 can be driven to move synchronously, thereby switching the switching lever 132 between the first position and the second position.

[0036] The sliding piece 134 is provided with a first inclined surface 1341 and a second inclined surface 1342, and the locking piece 136 is fixedly connected to a lever member 1361. Among them, the first inclined surface 1341 of the sliding piece 134 abuts the lower edges of the left and right sides of the key 131. When the key 131 moves downward, its lower edge slides downward along the first inclined surface 1341, causing the sliding piece 134 to move away from the key 131. The second inclined surface 1342 of the sliding piece 134 engages the lever member 1361.When the sliding piece 134 moves on the side opposite from the button 131, the lever member 1361 slides upward along the second inclined surface 1342 and then drives the locking piece 136 to move upward; The lid of the auxiliary compartment 12 is provided with a locking groove 137 which cooperates with the locking piece 136 to realize locking or unlocking of the lid of the auxiliary compartment 12: When the locking piece 136 enters the locking groove 137, the lid of the auxiliary compartment 12 is locked and cannot be opened; When the locking piece 136 is moved upward out of the locking groove 137, the lid of the auxiliary compartment 12 is unlocked and can be opened.

[0037] The return member 135 includes a fixing piece 1351 and a return spring 1352, the fixing piece 1351 being disposed between the first inclined surface 1341 and the second inclined surface 1342, with both ends of the return spring 1352 abutting against the sliding piece 134 and the fixing piece 1351, respectively. When the user presses the button 131, the sliding piece 134 moves to the side away from the button 131, and the return spring 1352 deforms and stores elastic potential energy; when the user releases the button 131, the return spring 1352 releases elastic potential energy and pushes the sliding piece 134 to move in a direction approaching the button 131, thereby returning the button 131 to the original position.

[0038] In this embodiment, due to the large size of the trunk, the auxiliary compartment 11 is appropriately large, in order to prevent the side edge of the lid of the auxiliary compartment 12 from twisting, resulting in a gap between the lid of the auxiliary compartment 12 and the trunk body 1, two sliding pieces 134, returning member 135 and locking piece 136 are provided, and two locking grooves 137 of the lid of the auxiliary compartment 12 are also provided corresponding to the position of the locking piece 136 to achieve stable locking.

[0039] When the user needs to lock the lid of the auxiliary compartment 12 during actual use, the switching lever 132 can be moved to the first position by the switching piece 133 in the case body 1. At this time, the switching lever 132 abuts the lower edge of the button 131, and the button 131 cannot be pressed, and the lid of the auxiliary compartment 12 remains locked.

[0040] When the user needs to open the lid of the auxiliary compartment 12 or quickly take out the items in the auxiliary compartment 11, the switching lever 132 is moved to the second position by the switching piece 133 in the case body 1. At this time, the switching lever 132 is located below the recess of the button 131, and the button 131 can be pressed. The user presses the button 131 to move it downward, and the switching lever 132 is received in the recess; the downward movement of the button 131 drives the sliding piece 134 to move, and the movement of the sliding piece 134 drives the locking piece 136 to move upward, so that the locking piece 136 is released from the locking groove 137. At this time, the user can open the lid of the auxiliary compartment 12 and take out items.After the item is removed, close the lid of the auxiliary compartment 12 and release the button 131, and the reset component 135 drives the slide piece 134 to reset, thereby restoring the button 131. Users can complete the locking and unlocking by simply switching the switch lever and pressing the button, which meets the need for quick retrieval and storage of items and improves the user experience.

[0041] In the embodiment of this utility model, the costs for cases made of EPP foam are significantly lower than those for aluminum cases. The EPP molding process is simpler, and the material is far less expensive than aluminum alloys. Its impact resistance far exceeds that of both PC and aluminum cases. Because EPP is relatively soft, the case itself absorbs shocks even under heavy impacts, leaving no permanent dents, and thus offers excellent protection for its contents. EPP also exhibits excellent weather resistance—in extreme temperatures, the material's behavior hardly changes, and thanks to minimal water absorption, there is no risk of moisture buildup or mold growth, which represents a significant advantage over PC cases.EPP's chemical resistance is excellent, whereas PC cases are extremely sensitive to strong acids / bases and organic solvents, and aluminum cases are easily corroded by acids. With its significantly lower density than PC and aluminum, EPP offers significant weight advantages, especially for frequently transported cases. Furthermore, EPP material is 100% recyclable and therefore extremely environmentally friendly, whereas aluminum production and recycling are considerably more polluting.

[0042] When describing the utility model, it should be understood that the directional or positional relationships indicated by directional terms such as "front," "back," "top," "bottom," "left," "right," "horizontal," "vertical," "perpendicular," "horizontal," "top," and "bottom" are generally based on the directional or positional relationships shown in the drawings and serve only to simplify the description of the utility model. Unless expressly stated otherwise, these directional terms do not imply that the devices or components mentioned must be arranged or operated in a specific orientation and are therefore not to be understood as limiting the scope of protection of this utility model. The directional terms "inside" and "outside" refer to the inner and outer contours of the respective components themselves.

[0043] For ease of description, spatially relative terms such as "upper," "above," etc., may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as illustrated in the drawings. It is understood that the spatially relative term encompasses different orientations in use or operation that are besides the orientation of the device described in the drawings. For example, if a device is reversed in the drawing, a device described as being "above another device or feature" or "above another device or feature" would be positioned as being "below another device or feature" or "below another device or feature." Therefore, the exemplary term "upper" can encompass both the "above" and "below" orientations.The device can also be positioned in a different way (rotated by 90 degrees or in a different orientation), and the spatial relative description used here will be interpreted accordingly.

[0044] Furthermore, it should be noted that the use of words such as "first" and "second" to delimit parts makes it easier to distinguish between the corresponding parts. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0045] The above is only a preferred embodiment of the utility model and is not intended to limit the utility model. A person skilled in the art will recognize that the utility model may have various modifications and variations. All modifications, equivalent replacements, improvements, etc., made in the spirit and principle of the utility model are included within the scope of protection of the utility model. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CN 202421784232.6

[0001]

Claims

[1] A rolling suitcase made of foam material, comprising a suitcase body with an opening and a lid covering the opening, characterized by , That both the lid and the case body are made of foam material; And that fastening elements are arranged on the side walls of the case body or at the connecting points of adjacent side walls, which act on a reinforcing surface of the case body. [2] A rolling suitcase made of foam material according to claim 1, characterized by that the foam material is made of EPP and the lid is rotatably connected to the case body. [3] A rolling suitcase made of foam material according to claim 1, characterized by that a buffer component is arranged on the case body or on the lid, wherein the buffer component comprises a base shell. [4] A rolling suitcase made of foam material according to claim 2, characterized by that rollers are provided; The base shell is arranged on an underside of the case body; And the rollers are firmly connected to the base shell. [5] A rolling suitcase made of foam material according to claim 2, characterized by that the base shell is arranged on an underside of the case body; and is fixed to the case body by means of a base shell lock. [6] A rolling suitcase made of foam material according to claim 1, characterized by that a plurality of fastening elements are arranged around the circumference of the case body on a plurality of side walls, with a distance between adjacent fastening elements; The fastening elements are embedded in the side walls of the case body or at the joints of adjacent side walls in order to reinforce the side walls of the case body; The lid is provided with a metal frame that runs around the circumference of the lid; The case body is provided with a case body metal frame that runs around the circumference of the case body. [7] A rolling suitcase made of foam material according to claim 1, characterized by that a lid metal frame is firmly attached to the lid, a case body metal frame is fixed to the case body in position opposite the lid, wherein the lid is closed when the lid metal frame comes into contact with the case body metal frame; the case body metal frame is connected to the fastening elements in order to effect a relative fixation between the case body and the case body metal frame. [8] A rolling suitcase made of foam material according to claim 1, characterized by that an additional compartment and an additional compartment cover are provided on the case body, wherein the additional compartment cover is rotatably connected to the case body; a locking mechanism is arranged between the case body and the additional compartment cover, by means of which the additional compartment cover is locked. [9] A rolling suitcase made of foam material according to claim 8, characterized by that the locking mechanism comprises a button, a switching lever, a switching block, a slider, a reset component, a locking block and a locking groove; The button has a horizontal slotted opening to accommodate the gearshift lever when the button is pressed; A switching piece is arranged inside the case body, which is connected to the gear lever by fastening elements and switches the gear lever between the first and second positions; The slider is connected to the first and second inclined surfaces and the slide rod is firmly connected to the locking block; The first bevel of the slider rests on the lower edge of the key; the second bevel of the slider rests on the slide bar; The locking groove is on the auxiliary tray cover, which engages with the locking block to lock the auxiliary tray cover. [10] A rolling suitcase made of foam material according to claim 1, characterized by that at least one carrying handle is fixed to one side surface of the case body and the handle is attached to the side of the case body; a telescopic handle is provided and arranged on opposite sides of the case body.

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