Multi-fold traceless magnetic protection sleeve
By using magnetic putty as a magnetic element and combining it with the design of the mounting groove, the problem of surface marks on the magnetic protective sleeve is solved, improving service life and assembly stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN YUANGUAN PLASTIC & MOLD
- Filing Date
- 2025-04-25
- Publication Date
- 2026-04-28
AI Technical Summary
Existing magnetic protective cases are prone to leaving marks on the mirror-finished surface when used frequently, affecting user comfort and shortening their lifespan.
Magnetic putty is used as the magnetic element. Magnetic putty is a soft material made of magnetic powder and polymer. After curing, the surface is flat, avoiding pressure marks from hard edges. It is also constrained by the mounting groove to ensure that the magnetic putty is firmly inside the protective sleeve.
It effectively prevents marks from appearing, improves the service life and assembly stability of the protective case, and enhances the firmness of magnetic adsorption.
Smart Images

Figure CN224178187U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mobile phone kits, and more particularly to a multi-fold, seamless magnetic protective case. Background Technology
[0002] A phone case is a protective cover that surrounds the frame and bottom of a mobile phone.
[0003] In today's world, protective cases are a very common mobile phone accessory. Most mobile phone users choose a magnetic protective case to avoid scratches on the appearance of their phones. Of course, this magnetic protective case can also protect the phone from drops.
[0004] Modern magnetic phone cases typically have a mirror-like finish on their outer surface, making them very smooth. However, these cases aren't just for phones; they're also used with other devices, such as magnetic car mounts and power banks. The frequent disconnection and re-attachment of the case with these devices will leave marks on its surface. These marks are primarily due to the attraction between opposite poles, drawing the magnets inside the case. Since magnets are rigid, frequent disconnection and re-attachment cause them to push against the surface, leaving marks. This is especially noticeable with mirror-like finishes. For users, this reduced comfort indicates the product has reached the end of its lifespan. Utility Model Content
[0005] To address the aforementioned issues, this invention provides a multi-fold, non-marking magnetic protective cover, which significantly reduces the appearance of marks and extends the product's lifespan.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a multi-fold, traceless magnetic protective sleeve, comprising a body, the outer surface of which is provided with a smooth layer processed by mirror finishing, and a magnetic element provided inside the body, characterized in that the magnetic element is magnetic clay.
[0007] The beneficial effects of this utility model are:
[0008] This invention utilizes magnetic putty to achieve magnetic adsorption between the device and the magnetic putty. Magnetic putty is a soft material made of magnetic powder and polymer. After curing, the surface is smooth and will not produce extrusion marks due to hard edges. At the same time, after curing, magnetic putty also has a certain degree of softness. Compared with magnetic elements such as magnets, which have a fixed volume and sharp edges, the use of magnetic putty will not cause the inner layer material to be squeezed by the edge of the magnet, resulting in no marks on the outer surface of the body, thus improving the service life of the protective cover.
[0009] Furthermore, the body includes an outer layer and an inner layer. The inner surface of the inner layer is provided with a first mounting groove corresponding to the magnet. The inner surfaces of the outer layer and the inner layer are attached to each other, constraining the magnetic element within the first mounting groove.
[0010] In another embodiment, the main body includes a cover and an outer layer. The inner surface of the outer layer is provided with a second mounting groove. The cover has a shape that cooperates with the second mounting groove. Magnetic putty is placed in the second mounting groove. The cover and the second mounting groove cooperate to constrain the magnetic putty within the second mounting groove. Another advantage of this embodiment is that it optimizes the assembly difficulty. Traditionally, the use of magnets can lead to assembly detachment. However, by using soft magnetic putty and filling the second mounting groove, the magnetic putty is less likely to fall out of the second mounting groove, thereby reducing the assembly difficulty.
[0011] Specifically, the mounting groove is ring-shaped, and ring-shaped magnetic elements are generally used inside external equipment.
[0012] The inner layer, cover, and outer layer have flat surfaces that come into contact with the phone.
[0013] The best option is that the outer layer is 0.4mm thick. The 0.4mm thickness has very little impact on the magnetic force. In other words, the adsorption effect between the protective cover and the external device is stronger. Of course, this is also based on the fact that the magnetic putty will not leave marks on the inner layer, so an even thinner inner layer can be selected.
[0014] In the first and second embodiments, the outer surface of the outer layer is processed by a mirror finish. The advantage of using a mirror finish is that the mirror surface has high smoothness, a good feel, and can be used as a mirror. Attached Figure Description
[0015] Figure 1 This is a perspective view of the present invention.
[0016] Figure 2 yes Figure 1 Exploded view.
[0017] Figure 3 yes Figure 2 A stereoscopic view from another perspective.
[0018] Figure 4 This is an exploded view of another embodiment.
[0019] Figure 5 This is a perspective view of another embodiment. Detailed Implementation
[0020] like Figure 1-5As shown, a multi-fold, traceless magnetic protective case includes a main body, the outer surface of which is provided with a smooth layer processed by mirror finishing, and a magnetic element is provided inside the main body. The magnetic element is magnetic clay.
[0021] This invention utilizes magnetic putty 4 to achieve magnetic adsorption with the equipment. Magnetic putty 4 is a soft material made of magnetic powder and polymer. After curing, the surface is smooth and will not produce extrusion marks due to hard edges. At the same time, magnetic putty 4 also has a certain degree of softness after curing. Compared with magnetic elements such as magnets, which have a fixed volume and sharp edges, the use of magnetic putty 4 will not cause the inner layer material to be squeezed by the edge of a magnet, resulting in no marks on the outer surface of the body, thus improving the service life of the protective cover.
[0022] During the experimental verification, the protective cover was repeatedly folded and turned, and no marks appeared on the area of the protective cover corresponding to the magnetic putty 4.
[0023] Furthermore, it includes an outer layer 1 and an inner layer 2. The inner surface of the inner layer 2 is provided with a first mounting groove 21 corresponding to the magnet. The outer layer 1 covers the inner surface of the inner layer 2, constraining the magnetic element within the first mounting groove 21. The magnetic element is magnetic putty 4.
[0024] In another embodiment, the main body includes a cover 5 and an outer layer 6. The inner surface of the outer layer 6 is provided with a second mounting groove 61. The cover 5 has a shape that cooperates with the second mounting groove 61. Magnetic putty 4 is disposed in the second mounting groove 61. The cover 5 cooperates with the second mounting groove 61 to constrain the magnetic putty 4 within the second mounting groove 61. Another advantage of this embodiment is that it optimizes the assembly difficulty. Traditionally, the use of magnets can lead to assembly detachment. However, by using the soft material magnetic putty 4 and filling the second mounting groove 61, the magnetic putty 4 is less likely to fall out of the second mounting groove 61, thereby reducing the assembly difficulty.
[0025] Specifically, the first mounting slot 21 and the second mounting slot 61 are annular, and annular magnetic elements are generally used inside external equipment.
[0026] The inner layer 2, the cover 5, and the outer layer 1 have flat surfaces that come into contact with the phone.
[0027] The outer layer 2 has a thickness of 0.4mm. The thickness of 0.4mm has a very small impact on the magnetic force. In other words, the adsorption effect between the protective cover and the external device is more secure. Of course, this is also based on the fact that the magnetic putty 4 will not leave marks on the inner layer 2, so an even thinner inner layer 2 can be selected.
[0028] It also includes a frame 3. In the first embodiment, the frame 3 is fitted onto the outer layer 1 and the inner layer 2 and connected to the edges of the outer layer 1 and the inner layer 2. In the second embodiment, the frame 3 is fitted onto the edge of the outer layer 6 and connected to the edge of the outer layer 6. The above connection method includes thermoforming.
[0029] In the first and second embodiments, the outer surface of the outer layer 1 is processed by a mirror finish. The advantage of using a mirror finish is that the mirror surface has high smoothness and a good feel.
[0030] The outer surface of the outer layer 1 is the surface where the protective sleeve contacts external equipment.
[0031] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.
Claims
1. A multi-fold, seamless magnetic protective case, comprising a main body, the outer surface of which has a smooth layer processed by a mirror finish, and a magnetic element disposed within the main body, characterized in that, The magnetic element is magnetic clay.
2. The multi-fold seamless magnetic protective case according to claim 1, characterized in that, The main body has a sandwich structure, consisting of an outer layer and an inner layer. The inner surface of the inner layer is provided with a first mounting groove corresponding to the magnet. The inner surfaces of the outer layer and the inner layer are attached to each other, constraining the magnetic element within the first mounting groove.
3. The multi-fold seamless magnetic protective case according to claim 1, characterized in that, The main body includes a cover and an outer layer. The inner surface of the outer layer is provided with a second mounting groove. The cover has a shape that matches the second mounting groove. The magnetic putty is placed in the second mounting groove. The cover matches the second mounting groove to constrain the magnetic putty in the second mounting groove.
4. A multi-fold, seamless magnetic protective case according to claim 1 or 2, characterized in that, The first and second mounting slots are annular.
5. A multi-fold, seamless magnetic protective case according to claim 2, characterized in that, The inner layer has a flat surface that contacts the phone.
6. A multi-fold, seamless magnetic protective case according to claim 3, characterized in that, The inner surfaces of both the cover and the outer layer are flat.
7. A multi-fold, seamless magnetic protective case according to claim 2, characterized in that, The outer layer is 0.4 mm thick.