A folding electronic product protection device

Abstract

The application discloses a folding electronic product protection device, which comprises a first shell and a second shell, the first shell is provided with a first receiving part and a connecting part, the connecting part comprises a folding part, a stretching part and a combining part, the folding part is a flexible body, the stretching part is a stretchable flexible body; the folding part is connected with the first receiving part, the stretching part is connected with the folding part, and the combining part is connected with the stretching part; the second shell comprises a second receiving part and a third receiving part, and the first shell and the second shell are combined and fixed through the combining part and the third receiving part. The folding part, the stretching part and the combining part are arranged on the first shell, the stretching deformation of the product during folding is mainly provided by the stretching part, the folding part is only wrapped on the hinge bending part of the mobile phone after folding, the stretching part avoids the hinge bending part, a large size stretching amount can be generated under a small pulling force, and thus damage of the mobile phone caused by the excessive elastic force of the protection sleeve can be prevented.

Description

Technical Field

[0001] This invention relates to the field of accessories technology for mobile phones and other electronic devices, and specifically to a protective case / cover device for foldable electronic products. Background Technology

[0002] To protect fragile electronic products like mobile phones from scratches and damage, people usually use protective cases (or covers). For common tablet phones, current technology is quite advanced, providing good protection without significantly affecting normal use. However, with the emergence of foldable tablet phones and their growing popularity, their higher price and the gaps at the hinges when folded make them more susceptible to damage from dust, sand, and water droplets. Therefore, foldable tablet phones require more protective cases than traditional phones.

[0003] In addition to traditional phones, foldable phablets also require protective cases to prevent scratches, wear, or even breakage from direct contact with external objects, thus providing drop and shock resistance. While various types of protective cases are available on the market, such as hard plastic cases, soft plastic cases, waterproof cases, and drop-proof cases, traditional case structures cannot accommodate the folding and bending capabilities of foldable phablets. Therefore, current protective cases do not meet consumer needs.

[0004] To address this, various protective cases have been designed specifically for foldable tablet electronic products. For example, the solution disclosed in utility model patent CN202121622933 sets a hinge protection component between the front and rear protective shells. Although the hinge protection component can effectively protect the hinge bending part of the foldable screen phone, it is quite inconvenient to use because the hinge protection component must be removed when unfolding the phone and then installed when folding it, resulting in low consumer acceptance.

[0005] For example, the solution disclosed in patent CN202121154776 includes a connector comprising multiple hollow sections and a connecting section between these hollow sections. The connecting section has both a folded and an extended state. By setting multiple hollow sections on the connecting section, it can better fit the outer surface of the folding part of the foldable terminal. While this method can improve the tensile deformation capability of the soft rubber material, it has the following problems: when folded, the connecting section covers the hinge bending part of the phone, resulting in excessive restoring force pressing on the hinge bending part, which can easily damage the phone and affect its folding performance; at the same time, the connecting section is under high tension when folded, making it prone to breakage. Furthermore, the hollow sections are directly exposed, which reduces the dustproof and waterproof capabilities of the protective case.

[0006] Another solution, such as the one disclosed in patent CN202020173398, utilizes a retractable shell combined with upper and lower shells to form a foldable protective shell. The sealed area can seal the foldable parts of the electronic device to achieve waterproofing and impurity protection, ensuring the safety of the electronic device. Although this structure seems reasonable, its practicality is low. This is because the pleated structure is prone to material fatigue and loosening after repeated opening and closing, leading to a gradual loss of its elasticity. Furthermore, the bonding strength between the retractable shell and the upper and lower shells is not high, and the retractable shell is quite thin, making it difficult to manufacture and resulting in relatively low structural strength. Other existing solutions are also available, but will not be detailed here. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a foldable electronic product protection device that is simple in structure, reasonable in design, easy to use, does not put too much pressure on the hinge and bending parts of the mobile phone, provides good fit and protection performance, and has sufficient strength.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a foldable electronic product protection device, comprising a first housing and a second housing, characterized in that: the first housing and the second housing are separate structures, which are assembled by interlocking to form a complete foldable electronic product protection device; the first housing has a first storage part and a connecting part, the first storage part provides assembly space for one side of the foldable electronic product, and the connecting part is used to fix it to the second housing;

[0009] The connecting part includes a folding part, a stretching part, and a connecting part. The folding part is a flexible body that can be bent, and the stretching part is a flexible body with elastic expansion and contraction function. The folding part is connected to the first storage part and covers the outer surface of the hinged bending part formed when the electronic product is folded. The stretching part is connected to the folding part, and the connecting part is connected to the stretching part and is located on the edge of the entire first shell facing the second shell.

[0010] The second housing includes a second storage section and a third storage section, the thickness of the second storage section being greater than the thickness of the third storage section; the second storage section is used to provide assembly space for accommodating the other side of the foldable electronic product, and the third storage section is used to provide space for assembly with the connecting section; a positioning structure is provided on the third storage section, and the first housing and the second housing are combined and fixed by the connecting section with the third storage section and its positioning structure;

[0011] When the foldable electronic product is unfolded, the first shell and the second shell are connected to each other, and the entire connecting part is completely embedded in the third storage part; when the foldable electronic product is folded, the second shell and the first shell are separated from each other, and the stretching part is stretched so that the folding part is located in the space separated by the first shell and the second shell and fits against the outer surface of the hinged bending part formed when the electronic product is folded.

[0012] Furthermore, the entire first housing is made of soft rubber, such as TPU, TPR, or silicone, with silicone being preferred. The connecting part, stretching part, folding part, and first storage part are an integral structure, molded as a single piece. After the first housing and the second housing are assembled and fixed, the edge of the connecting part is tightly attached to the edge of the second storage part, and the surface of the connecting part is flush with the surface of the second storage part, so as to achieve a closer fit with products such as mobile phones.

[0013] Furthermore, the width of the stretching section is greater than the width of the folding section and the joint section. Several openings are provided longitudinally on the stretching section to enhance its tensile elasticity. These openings can be circular, elliptical, rhomboid, or other shapes. This allows the stretching section to have a stress concentration effect, thereby improving its tensile performance and enabling it to be stretched more easily to the required degree.

[0014] Furthermore, the inner surface of the folded portion is smooth, allowing it to fit more tightly onto the surface of products such as mobile phones. The outer surface of the folded portion has longitudinal grooves that accommodate stretching and deformation during folding and bending. When the product is folded, the opening of these grooves allows it to better adapt to the material's folding requirements, reducing cracking caused by frequent folding.

[0015] Furthermore, several positioning holes corresponding to the positioning structures are provided on the joint. The joint is bonded and fixed to the joint area on the third housing part (such as by gluing, welding, or bonding), and each positioning structure is embedded in the corresponding positioning hole to position the joint. This achieves double fixation of the joint, thereby ensuring a sufficiently strong connection between the first and second housings.

[0016] Furthermore, a support portion matching the opening is provided on the third storage section. The support portion is embedded in the corresponding opening and blocks the inner edge of the joint, preventing the joint from being stretched. The space between the support portion and the inner edge of the second storage section is the joint area, and the surface of the support portion is flush with the surface of the joint. In this way, when products such as mobile phones are folded, the stretching part will be stretched and become thinner to a certain extent, but through the cooperation of the support portion, the joint, and the second storage section, a sufficiently tight fit can still be provided for the mobile phone, thus eliminating the need for support structures such as dividers to achieve a tight fit, as is required in some existing technologies.

[0017] Furthermore, the first storage portion of the first housing and the second storage portion of the second housing are respectively provided with openings for accommodating functional components such as displays, cameras, flashlights, or buttons. The opening on the first storage portion includes a display opening for aligning with the screen of the folded mobile phone (or other electronic product) to provide operating space, and the opening on the second storage portion includes an accommodating opening for aligning with cameras, flashlights, etc.

[0018] Preferably, the first and second housings are both made of soft rubber, a third housing is attached to the outer surface of the first housing, and a fourth housing is attached to the outer surface of the second housing. The third and fourth housings are both made of hard materials, and the third and fourth housings respectively form protective structures for the first and second housings.

[0019] Alternatively, both the first and second housings are made of soft rubber, with shock-absorbing mechanisms located at the four corners on their outer sides. These shock-absorbing mechanisms are integrally molded from soft rubber, and their interiors can be solid, hollow, or filled with shock-absorbing material. The surface of the shock-absorbing mechanism protrudes from the surface of the first or second housing in all directions. When the protective case is dropped and impacted at any angle, the shock-absorbing mechanism will be the first to contact the ground, thus absorbing the impact and protecting the internal mobile phone (or other electronic product). The first housing corresponds to the front of the folded electronic product, and the second housing corresponds to the back. An anti-slip mechanism with anti-slip stripes is provided on the outer surface of the second housing, protruding from its outer surface. The shock-absorbing mechanism and the anti-slip mechanism work together to provide anti-slip functionality. When placed on a table, the anti-slip mechanism and the shock-absorbing mechanism contact the table surface, thus providing an anti-slip effect.

[0020] Alternatively, a third shell is attached to the outer surface of the first shell, and a fourth shell is attached to the outer surface of the second shell. Both the third and fourth shells are made of rigid materials, and the outer corners of the third and fourth shells are set as clearance notches for corresponding shock-absorbing mechanisms. Each shock-absorbing mechanism is exposed from its corresponding clearance notch, and the third and fourth shells respectively form a protective structure for the first and second shells. The fourth shell is also provided with anti-slip clearance holes for corresponding anti-slip mechanisms. The anti-slip mechanisms are embedded in the anti-slip clearance holes, and the surface of the anti-slip mechanisms protrudes slightly from the surface of the fourth shell.

[0021] The third and fourth shells can be made of hard plastic, metal, glass, or other materials, so that the exterior of the protective cover has the hardness, strength, and toughness of a hard shell, while the interior has shock absorption, cushioning, and explosion-proof properties, thus possessing good shock absorption and anti-slip characteristics. The combination of the first and third shells and the second and fourth shells can be achieved through processes such as in-mold secondary molding, post-processing gluing, and riveting. Considering the requirements for shell bonding strength and appearance quality, in-mold secondary molding is the preferred process.

[0022] This invention features a connecting portion consisting of a folding part, a stretching part, and a connecting part on one side of the first housing. The connection to the second housing is achieved solely through this connecting part. The stretching deformation generated during folding is primarily provided by the stretching part. This allows the protective case to automatically adjust its shape and size according to the changing shape and dimensions of foldable phones and other electronic products during folding, achieving excellent foldability. This ensures that the phone is well-covered and receives good physical protection regardless of its folded state. Furthermore, after folding, the folding part only covers the hinge bend of the foldable phone, while the stretching part, with its greater restoring force, avoids the hinge bend. This allows for a larger dimensional stretch under relatively low tension, preventing damage to the phone due to excessive elasticity of the protective case. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the unfolded state of the first embodiment of the present invention;

[0024] Figure 2 This is a structural diagram of the unfolded state from another angle of the first embodiment of the present invention;

[0025] Figure 3 This is an exploded structural diagram of the first embodiment of the present invention;

[0026] Figure 4 This is a plan view illustrating the deformation process of the tensile portion according to the first embodiment of the present invention;

[0027] Figure 5 This is a side view illustrating the deformation process of the stretched portion according to the first embodiment of the present invention;

[0028] Figure 6 This is a structural diagram of the folded state according to the first embodiment of the present invention;

[0029] Figure 7 This is a structural diagram of the folded state from another angle of the first embodiment of the present invention;

[0030] Figure 8 This is a planar structural diagram of the folded state according to the first embodiment of the present invention;

[0031] Figure 9 for Figure 8 AA section view;

[0032] Figure 10 This is a structural diagram of the first housing according to the first embodiment of the present invention;

[0033] Figure 11 A plan view illustrating the deformation process of the tensile portion according to a second embodiment of the present invention;

[0034] Figure 12This is an exploded structural diagram of the third embodiment of the present invention;

[0035] Figure 13 This is a structural diagram of the unfolded state of the fourth embodiment of the present invention;

[0036] Figure 14 This is a structural diagram of the unfolded state of the fifth embodiment of the present invention;

[0037] Figure 15 This is an exploded structural diagram of the fifth embodiment of the present invention.

[0038] In the figure, 1 is the first housing, 11 is the first storage part, 12 is the folding part, 13 is the stretching part, 14 is the first connecting part, 15 is the display opening, 16 is the opening part, 17 is the positioning hole, 2 is the second housing, 21 is the second storage part, 22 is the third storage part, 23 is the clearance opening, 24 is the support part, 25 is the positioning structure, 3 is the third housing, 4 is the fourth housing, 41 is the anti-slip clearance hole, 5 is the anti-slip mechanism, and 6 is the shock absorption mechanism. Detailed Implementation

[0039] Reference Figures 1-11 The foldable electronic product protection device includes a first housing 1 and a second housing 2. The first housing 1 and the second housing 2 are separate structures. They are assembled by interlocking to form a complete foldable electronic product protection device (hereinafter, taking a foldable tablet phone as an example, or simply a phone). The first housing 1 has a first storage part 11 and a connecting part. The first storage part 11 provides assembly space for one side of the phone, and the connecting part is used to fix it to the second housing 2.

[0040] The connecting part includes a folding part 12, a stretching part 13, and a connecting part 14. The folding part 12 is a flexible body that can be bent, and the stretching part 13 is a flexible body with elastic expansion and contraction function. The folding part 12 is connected to the first storage part 11 and covers the outer surface (i.e., the side) of the hinged bending part formed when the mobile phone is folded. The stretching part 13 is connected to the folding part 12, and the connecting part 14 is connected to the stretching part 13 and is located on the edge of the entire first housing 1 facing the second housing 2.

[0041] The second housing 2 includes a second storage portion 21 and a third storage portion 22, the thickness of the second storage portion 21 being greater than the thickness of the third storage portion 22; the second storage portion 21 is used to provide assembly space for accommodating the other side of the mobile phone, and the third storage portion 23 is used to provide space for assembly with the connecting portion; a positioning structure 25 is provided on the third storage portion 22, and the first housing 1 and the second housing 2 are combined and fixed by the connecting portion 14 with the third storage portion 22 and the positioning structure 25;

[0042] When the phone is unfolded, the first housing 1 and the second housing 2 are connected to each other in a flat structure, and the entire connecting part is completely embedded in the third storage part 22; when the phone is folded, the second housing 2 and the first housing 1 are separated from each other, and the stretching part 13 is stretched so that the folding part 12 is located in the space separated by the first housing 1 and the second housing 2 and fits against the outer surface of the hinged bending part formed when the phone is folded.

[0043] The entire first housing 1 is made of soft rubber, such as TPU, TPR, or silicone, with silicone being preferred. The connecting part 14, the stretching part 13, the folding part 12, and the first storage part 11 are an integral structure, molded as a single piece. After the first housing 1 and the second housing 2 are assembled and fixed, the edge of the connecting part 14 is tightly attached to the edge of the second storage part 21, and the surface of the connecting part 14 is flush with the surface of the second storage part 21, so as to achieve a tighter fit with the back of the mobile phone and prevent obvious gaps.

[0044] The width of the stretching portion 13 is greater than the width of the folding portion 12 and the width of the connecting portion 14. A plurality of openings 16 are provided longitudinally on the stretching portion 13 to enhance its tensile elasticity. The openings 16 can be circular, elliptical, rhomboid, or other shapes. In the first embodiment, the openings are similar to an ellipse, such as... Figures 1-10 As shown. The second embodiment has a diamond-shaped opening, as shown. Figure 11 As shown. This allows the tension section 13 to have a stress concentration effect, thereby improving its tensile properties and making it easier to stretch to the required degree.

[0045] The inner surface of the folding part 12 is smooth, which allows it to fit more tightly against the side surface of the phone. The outer surface of the folding part 12 has longitudinal grooves that can adapt to the stretching and deformation during folding and bending. When the product is folded, the grooves open to better adapt to the material folding requirements and reduce the cracking caused by frequent folding.

[0046] A plurality of positioning holes 17 corresponding to positioning structures 25 are provided on the joint portion 14. The joint portion 14 is bonded and fixed to the joint area on the third receiving portion 22 (such as by gluing, welding, or bonding), and each positioning structure 25 is embedded in the corresponding positioning hole 17 to position the connecting portion. This achieves double fixation of the joint portion 14, thereby enabling the first housing 1 and the second housing 2 to achieve a sufficiently strong connection.

[0047] A support portion 24 is provided on the third storage section 22 to match the opening 16. The support portion 24 is embedded in the corresponding opening 16 and blocks the inner edge of the connecting portion 14, preventing the connecting portion 14 from being stretched. The space between the support portion 24 and the inner edge of the second storage section 21 is the connecting area, and the surface of the support portion 24 is flush with the surface of the connecting portion 14. In this way, when the phone is folded, the stretching portion 13 will be stretched and become thinner to a certain extent, but through the cooperation of the support portion 24, the connecting portion 14, and the second storage section 21, a sufficiently tight fit can still be provided for the phone, so that it is not necessary to set up a support structure such as a partition bar to achieve a tight fit, as in some existing technologies.

[0048] The first storage portion 11 of the first housing 1 and the second storage portion 21 of the second housing 2 are respectively provided with openings for the clearance of functional components such as display, camera, flash or buttons. The opening on the first storage portion 11 includes a display opening 15 for aligning with the screen when the phone is folded to provide operating space. The opening on the second storage portion 21 includes a clearance opening 23 for aligning with the camera, flash, etc.

[0049] like Figure 12 The third embodiment is shown. The first shell 1 and the second shell 2 are both made of soft rubber. A third shell 3 is attached to the outer surface of the first shell 1, and a fourth shell 4 is attached to the outer surface of the second shell 2. The third shell 3 and the fourth shell 4 are both made of hard material. The third shell 3 and the fourth shell 4 respectively form a protective structure for the first shell 1 and the second shell 2.

[0050] like Figure 13 The fourth embodiment is shown. Both the first housing 1 and the second housing 2 are made of soft rubber. Shock-absorbing mechanisms 6 are provided at the four corners on the outer sides of the first housing 1 and the second housing 2. The shock-absorbing mechanisms 6 are integrally molded from soft rubber, and their interiors can be solid, hollow, or filled with shock-absorbing material. The surface of the shock-absorbing mechanism 6 protrudes from the surface of the first housing 1 or the second housing 2 in all directions. When the protective case is dropped and impacted at any angle, the shock-absorbing mechanism 6 will be the first to contact the ground, thus absorbing the impact and protecting the internal mobile phone. The first housing 1 corresponds to the front of the folded mobile phone, and the second housing 2 corresponds to the back of the folded mobile phone. An anti-slip mechanism 5 with anti-slip stripes is provided on the outer surface of the second housing 2, protruding from the outer surface of the second housing 2. The shock-absorbing mechanism 6 and the anti-slip mechanism 5 can cooperate to provide an anti-slip function. Thus, when placed on a table, the anti-slip mechanism 5 and the shock-absorbing mechanism 6 contact the table surface, thereby providing an anti-slip effect.

[0051] like Figure 14 and Figure 15The fifth embodiment is shown. A third shell 3 is attached to the outer surface of the first shell 1, and a fourth shell 4 is attached to the outer surface of the second shell 2. Both the third shell 3 and the fourth shell 4 are made of rigid materials. The outer corners of the third shell 3 and the fourth shell 4 are set as clearance notches for the corresponding shock-absorbing mechanisms 6. Each shock-absorbing mechanism 6 is exposed from the corresponding clearance notch. The third shell 3 and the fourth shell 4 respectively form a protective structure for the first shell 1 and the second shell 2. The fourth shell is also provided with anti-slip clearance holes 41 for the corresponding anti-slip mechanism 5. The anti-slip mechanism 5 is embedded in the anti-slip clearance holes 41, and the surface of the anti-slip mechanism 5 protrudes slightly from the surface of the fourth shell 4 so that it can contact the tabletop.

[0052] The third shell 3 and the fourth shell 4 can be made of hard plastic, metal, glass or other materials, so that the exterior of the protective cover has the hardness, strength and toughness of a hard shell, while the interior has shock absorption, cushioning and explosion-proof properties, thus having good shock absorption and anti-slip properties. The combination of the first shell 1 and the third shell 3 and the second shell 2 and the fourth shell 4 can be achieved by in-mold secondary molding, post-processing gluing, riveting or other processes. Considering the requirements of shell bonding strength and appearance quality, in-mold secondary molding is the preferred process.

[0053] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A foldable electronic product protection device comprising a first housing and a second housing, characterized in that: The first shell and the second shell are in a split structure, and the two are assembled by mutual docking to form a complete folding electronic product protection device; the first shell has a first receiving part and a connecting part, the first receiving part provides an assembly space for one side of the folding electronic product, and the connecting part is combined and fixed with the second shell; The connecting part includes a folding part, a stretching part and a combining part, the folding part is a flexible body that can be bent, and the stretching part is a flexible body with elastic stretching function; the folding part is connected with the first receiving part and covers the outer surface of the hinge bending part formed when the electronic product is folded; the stretching part is connected with the folding part, and the combining part is connected with the stretching part and located at the edge of the first shell towards the second shell; The second shell includes a second receiving part and a third receiving part, the thickness of the second receiving part is greater than that of the third receiving part; the second receiving part is used to provide an assembly space for the other side of the folding electronic product, and the third receiving part is used to provide a space for assembling the connecting part; a positioning structure is arranged on the third receiving part, the combining part is combined and fixed with the third receiving part and its positioning structure, so that the first shell and the second shell are combined and fixed; When the folding electronic product is unfolded, the first shell and the second shell are mutually docked, and the entire connecting part is completely embedded in the third receiving part; when the folding electronic product is folded, the second shell and the first shell are mutually separated, the stretching part is stretched so that the folding part is located in the space separated by the first shell and the second shell and adheres to the outer surface of the hinge bending part formed when the electronic product is folded.

2. The foldable electronic device protective case of claim 1, wherein: The entire first shell is made of soft glue, the combining part, the stretching part, the folding part and the first receiving part are in an integrated structure, after the first shell and the second shell are combined and fixed, the edge of the combining part closely abuts the edge of the second receiving part, and the surface of the combining part is flush with the surface of the second receiving part.

3. The foldable electronic device protective case of claim 1, wherein: The width of the stretching part is greater than that of the combining part, and a plurality of opening parts are arranged on the stretching part in the longitudinal direction to improve the stretching elasticity of the stretching part.

4. The foldable electronic device protective case of claim 1, wherein: The inner surface of the folding part is a smooth surface, and the outer surface of the folding part has longitudinal lines that can adapt to stretching deformation when folding and bending.

5. The foldable electronic device protective case of claim 3, wherein: A plurality of positioning holes corresponding to the positioning structures are arranged on the combining part, the combining part is adhesively fixed with the combining area on the third receiving part, and each positioning structure is embedded in the corresponding positioning hole to realize positioning of the connecting part.

6. The foldable electronic device protective case of claim 5, wherein: A supporting part corresponding to the opening part is arranged on the third receiving part, the supporting part is embedded in the corresponding opening part and blocks the inner edge of the combining part; the space between the supporting part and the inner edge of the second receiving part is the combining area, and the surface of the supporting part is flush with the surface of the combining part.

7. The foldable electronic device protective case of claim 1, wherein: Openings for display, camera or key avoidance are arranged on the first receiving part of the first shell and the second receiving part of the second shell, respectively, wherein the openings on the first receiving part include display openings, and the openings on the second receiving part include avoidance openings.

8. The foldable electronic device protective case of claim 1, wherein: The first shell and the second shell are made of soft glue, the third shell is pasted on the outer surface of the first shell, the fourth shell is pasted on the outer surface of the second shell, the third shell and the fourth shell are made of hard material, and the third shell and the fourth shell form the protection structure of the first shell and the second shell respectively.

9. The foldable electronic device protective case of claim 1, wherein: The first shell and the second shell are made of soft glue, and shock-absorbing mechanisms are arranged at four corner positions on the outer sides of the first shell and the second shell; the shock-absorbing mechanisms are integrally formed by soft glue, the inside of the shock-absorbing mechanisms is solid, hollow or filled with shock-absorbing material, and the surface of the shock-absorbing mechanisms is convex to the surface of the first shell or the second shell in each direction; the first shell corresponds to the front surface of the folded folding electronic product, the second shell corresponds to the back surface of the folded folding electronic product, and an anti-skid mechanism with anti-skid stripes is arranged on the outer surface of the second shell, and the anti-skid mechanism is convex to the outer surface of the second shell.

10. The foldable electronic device protective case of claim 9, wherein: The third shell is pasted on the outer surface of the first shell, the fourth shell is pasted on the outer surface of the second shell, the third shell and the fourth shell are made of hard material, and the outer corner positions of the third shell and the fourth shell are provided with avoidance notches corresponding to the shock-absorbing mechanisms, each shock-absorbing mechanism is exposed from the corresponding avoidance notch, the third shell and the fourth shell form the protection structure of the first shell and the second shell respectively; an anti-skid avoidance hole corresponding to the anti-skid mechanism is further arranged on the fourth shell, the anti-skid mechanism is embedded in the anti-skid avoidance hole, and the surface of the anti-skid mechanism is slightly convex to the surface of the fourth shell.

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