Magnetic pen

Abstract

This utility model relates to the field of stationery technology, and in particular to a magnetic pen, which includes a pen barrel, a magnetic element, and a pen tip. A receiving cavity and a snap-fit ​​component are respectively provided on the inner side of the pen tip and the pen barrel. The magnetic element is installed in the receiving cavity, and its two ends abut against the inner side of the receiving cavity and the snap-fit ​​component, respectively, achieving bidirectional axial positioning and fixation of the magnetic element. This not only completely avoids the problem of easy aging and detachment of traditional adhesive fixing methods, but also significantly improves assembly reliability and service life. At the same time, the tight fit between the magnetic element and the inner wall of the receiving cavity, and the snap-fit ​​design of the connector, further improve the connection stability of the magnetic element, while simplifying the manufacturing process. The outer wall of the pen tip adopts a streamlined shape with a gradually decreasing diameter and a cylindrical contact protrusion, which not only meets the ergonomic grip requirements but also maintains stable contact with the drawing board.

Description

Technical Field

[0001] This utility model relates to the field of stationery technology, and in particular to a magnetic pen. Background Technology

[0002] A magnetic pen is a common writing and drawing tool that uses a drawing board to create handwriting through magnetic force. A magnetic pen typically consists of a pen barrel and a magnet; the magnet interacts with magnetic particles beneath the drawing board to form visible marks. Due to its simple structure and ease of use, it is widely used by children or in temporary writing situations.

[0003] However, the magnets in existing magnetic pens are mainly fixed to the pen barrel with glue. After long-term use, the magnets are prone to loosening or even falling off due to friction or impact, which not only affects normal use but also poses a safety hazard as they may be accidentally swallowed or lost. In addition, the glue fixing method is easily affected by ambient temperature or humidity, causing the adhesive to fail and further increasing the risk of the magnets loosening. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a magnetic pen.

[0005] The present invention adopts the following technical solution:

[0006] A magnetic pen includes a pen barrel, a pen tip connected to the pen barrel, and a magnetic element installed inside the pen tip. The pen barrel has an inner cavity and includes a snap-fit ​​member fixed in the inner cavity. The pen tip has a contact protrusion at one end away from the pen barrel, and a receiving cavity is provided inside the pen tip. One end of the receiving cavity extends to the contact protrusion, and the other end of the receiving cavity communicates with the inner cavity of the pen barrel. The magnetic element is fixed in the receiving cavity and the inner cavity. The magnetic element has an inner end and an outer end that are disposed opposite to each other. The outer end of the magnetic element abuts against the inner wall of the contact protrusion, and the inner end of the magnetic element abuts against the snap-fit ​​member.

[0007] Preferably, the magnetic element is arranged in a longitudinal shape and extends along the axial direction of the pen barrel.

[0008] Preferably, the magnetic element is cylindrical, the accommodating cavity is cylindrical, and the outer wall of the magnetic element is in close contact with the inner wall of the accommodating cavity.

[0009] Preferably, the inner cavity includes a transition section connecting the accommodating cavity, and the diameter of the transition section gradually decreases axially from the pen barrel to the pen tip.

[0010] Preferably, the snap-fit ​​component is arranged in the shape of a vertical plate, and the extending direction of the snap-fit ​​component is the same as the extending direction of the magnetic element.

[0011] Preferably, the snap-fit ​​component includes a top abutment and connecting ends disposed on both sides of the top abutment. The top abutment abuts against the inner end of the magnetic element, and the connecting ends are fixedly connected to the inner walls on both sides of the inner cavity.

[0012] Preferably, the end of the abutment facing the pen tip is provided with a connecting slot, the inner end of the magnetic element is engaged in the connecting slot, and the inner wall of the connecting slot abuts against the outer wall of the magnetic element.

[0013] Preferably, the snap-fit ​​component and the pen tip are integrally injection molded.

[0014] Preferably, the contact protrusion is provided with an injection molding auxiliary hole, which communicates with the accommodating cavity; the diameter of the injection molding auxiliary hole is smaller than the outer diameter of the magnetic element.

[0015] Preferably, the outer edge of the bottom of the contact protrusion is chamfered.

[0016] The beneficial effects of this utility model are as follows:

[0017] The magnetic pen of this invention comprises a pen barrel, a magnetic element, and a pen tip. A receiving cavity and a snap-fit ​​component are respectively provided on the inner side of the pen tip and the pen barrel. The magnetic element is installed in the receiving cavity, with both ends abutting against the inner side of the receiving cavity and the snap-fit ​​component, respectively, achieving bidirectional axial positioning and fixation of the magnetic element. This not only completely avoids the problem of easy aging and detachment caused by traditional adhesive fixing methods, but also significantly improves assembly reliability and service life. Simultaneously, the tight fit between the magnetic element and the inner wall of the receiving cavity, and the connection bayonet design of the snap-fit ​​component, further improve the connection stability of the magnetic element and simplify the manufacturing process. The outer wall of the pen tip adopts a streamlined shape with a gradually decreasing diameter and a cylindrical contact protrusion, which not only meets the ergonomic grip requirements but also maintains stable contact with the drawing board. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the magnetic pen of this utility model;

[0019] Figure 2 This is a bottom view of the magnetic pen of this utility model;

[0020] Figure 3 for Figure 2 Sectional view along AA;

[0021] Figure 4 for Figure 2 Sectional view along BB;

[0022] Figure 5 for Figure 4 A schematic diagram of the structure after the magnetic components are hidden;

[0023] Figure 6 for Figure 5 A schematic diagram of the partial structure of the middle circle C;

[0024] Figure 7 This is a front view of the magnetic pen of this utility model;

[0025] Figure 8 for Figure 7 Sectional view along DD;

[0026] Figure 9 A schematic diagram of the mold used with the magnetic pen of this utility model;

[0027] Figure 10 for Figure 9 Sectional view along EE;

[0028] Figure 11 for Figure 10 A partial structural diagram of the central circle F.

[0029] Numbering on the map:

[0030] 10-Pen barrel; 11-Connecting part; 12-Connecting groove; 13-Pen cap; 14-Annular rib;

[0031] 20 - Magnetic element; 21 - Inner end; 22 - Outer end;

[0032] 30 - Pen tip;

[0033] 40 - Contact protrusion; 41 - Chamfer; 42 - Injection molding auxiliary hole;

[0034] 50 - Receptacle;

[0035] 60 - Inner cavity;

[0036] 70 - Snap-on connector; 71 - Top abutment; 72 - Connecting end; 73 - Connecting bayonet;

[0037] 80-First injection cavity; 81-Core post; 811-Clamping arm; 82-Cavity insert; 821-Inner recess; 83-Positioning rod; 90-Second injection cavity. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] In the description of this utility model, it should be noted that the terms "vertical direction," "up," "down," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] like Figures 1 to 8 As shown, this is the magnetic pen of this invention, used with a drawing board. It utilizes magnetic force to display handwriting, solving the problem of magnets easily falling off in existing magnetic pens. Figures 9 to 11 The image shows the mold that accompanies the magnetic pen of this utility model.

[0042] Please see Figures 1 to 8 The magnetic pen includes a pen barrel 10, a pen tip 30 connected to the pen barrel 10, and a magnetic element 20 installed inside the pen tip 30. The pen tip 30 has a contact protrusion 40 at one end away from the pen barrel 10, and a receiving cavity 50 extending axially along the pen barrel 10 on the inner side of the pen tip 30. One end of the receiving cavity 50 extends to the contact protrusion 40, and the other end of the receiving cavity 50 communicates with the inner side of the pen barrel 10. The pen barrel 10 has an inner cavity 60 communicating with the receiving cavity 50, and a snap-fit ​​member 70 is fixedly installed on the inner side of the inner cavity 60. The magnetic element 20 has an inner end 21 and an outer end 22. The magnetic element 20 is disposed within the receiving cavity 50. At this time, the outer end 22 of the magnetic element 20 abuts against the inner wall of the contact protrusion 40, and the inner end 21 of the magnetic element 20 extends into the inner cavity 60 and abuts against the snap-fit ​​member 70. The above structure effectively achieves bidirectional mechanical fixation of the magnetic element 20, avoiding the problem of easy aging and detachment of traditional adhesive fixing methods, and effectively avoiding safety hazards.

[0043] Please see Figure 3 and Figure 4 The pen barrel 10 adopts a cylindrical structure, which meets the requirements of ergonomic design and makes it easy for users to hold the magnetic pen. At the same time, the hollow structure of the pen barrel 10 can reduce the amount of material used in production and facilitate positioning during the injection molding process.

[0044] Please see Figure 3 and Figure 4 In this embodiment, the magnetic element 20 is a magnet, which is cylindrical and extends along the axial direction of the pen barrel 10. When the magnetic pen comes into contact with the drawing board, the magnetic element interacts with the magnetic particles below the drawing board to form a visible mark.

[0045] Please see Figure 3 and Figure 4 In this embodiment, the pen tip 30 is integrally injection molded with the pen barrel 10, simplifying the manufacturing process. The outer diameter of the pen tip 30 gradually decreases axially from the pen barrel 10 towards the contact protrusion 40, while the outer wall of the pen tip 30 is a continuous, smooth, curved surface. This design makes the magnetic pen's appearance closer to a common pen shape, meeting market demands.

[0046] Please see Figures 3 to 6 The contact protrusion 40 is cylindrical, and its outer diameter is much smaller than that of the pen tip 30. This reduces the contact area between the magnetic pen and the drawing board, resulting in finer and more precise lines displayed on the board, thus optimizing the magnetic pen's performance. The outer edge of the bottom of the contact protrusion 40 has a chamfer 41 to reduce wear between the pen tip 30 and the drawing board, extending its lifespan. Additionally... Figure 6 As shown, the contact protrusion 40 in this embodiment is provided with an injection molding auxiliary hole 42 that communicates with the receiving cavity 50. The injection molding auxiliary hole 42 helps with positioning during the injection molding process and reduces the difficulty of injection molding. It should be noted that the diameter of the injection molding auxiliary hole 42 is less than four-fifths of the outer diameter of the magnetic element 20. Specifically, the diameter of the injection molding auxiliary hole 42 is smaller than that of the magnetic element 20. Furthermore, the injection molding auxiliary hole 42 is not a necessary structure; the pen tip 30 can be injection molded and the magnetic element 20 can be fixed without it.

[0047] Please see Figures 4 to 6 The receiving cavity 50 is adapted to the magnetic element 20. The receiving cavity 50 is cylindrical, and the outer wall of the magnetic element 20 is in close contact with the inner wall of the receiving cavity 50. This prevents the magnetic element 20 from shaking and facilitates processing. The inner diameter of the pen barrel 10 is larger than the inner diameter of the receiving cavity 50. Therefore, the inner cavity 60 is conical. The inner cavity 60 includes a transition section connecting the receiving cavity 50. The diameter of the transition section gradually decreases axially from the pen barrel 10 to the pen tip 30, ensuring that the inner wall of the pen barrel 10 is in contact with the inner wall of the pen tip 30, reducing processing difficulty.

[0048] Please see Figure 6 and Figure 8In this embodiment, the snap-fit ​​component 70 is a vertical plate extending along the axial direction of the pen barrel 10, with a simple and compact structure. The snap-fit ​​component 70 is integrally formed with the pen barrel 10 through injection molding, reducing production costs. It should be noted that the shape of the snap-fit ​​component 70 is not limited to the straight-line structure in this embodiment; a cross-shaped structure or other shapes can also be used. Specifically, the snap-fit ​​component 70 includes a top abutment 71 and connecting ends 72 on both sides of the top abutment 71. The top abutment 71 abuts against the inner end 21 of the magnetic element 20, and the connecting ends 72 are fixedly connected to the inner walls on both sides of the inner cavity 60. A connecting slot 73 is provided at the end of the top abutment 71 facing the pen tip 30. The inner end 21 of the magnetic element 20 is snapped into the connecting slot 73, and the inner wall of the connecting slot 73 abuts against the outer wall of the magnetic element 20, which can suppress radial shaking during use, thereby improving the connection stability.

[0049] Please see Figure 1 and Figure 3 The pen barrel 10 has a connecting part 11 at the end away from the pen tip 30, and the top of the connecting part 11 has an annular connecting groove 12; it also includes a pen cap 13, and the bottom of the pen cap 13 has an annular protrusion 14 that engages with the connecting groove 12. In order to meet the requirements of injection molding, the pen barrel 10 has an open structure at one end, and the pen cap 13 is set to be assembled and connected to it, which can seal the internal space of the pen barrel 10 and optimize the appearance design of the magnetic pen.

[0050] The injection mold for the aforementioned magnetic pen will be described next. Please refer to [link / reference]. Figures 9 to 11 The injection mold is provided with a first injection cavity 80 and a second injection cavity 90; wherein the first injection cavity 80 is used for injection molding of the pen barrel 10 and the pen tip 30; and the second injection cavity 90 is used for injection molding of the pen cap 13.

[0051] The first injection cavity 80 contains a core post 81 and a cavity insert 82 arranged vertically opposite each other. The top of the core post 81 has two opposing clamping arms 811, and the bottom of the cavity insert 82 has a recessed portion 821. It also includes a positioning forming rod 83, the bottom end of which extends into the recessed portion 821. During injection molding, the magnetic element 20 is pre-clamped between the two clamping arms 811, while the positioning forming rod 83 abuts against the top of the magnetic element 20. When injection molding is performed into the first injection cavity 80, a pen barrel 10 is formed between the first injection cavity 80 and the core post 81, and a snap-fit ​​member 70 is formed between the two clamping arms 811. A pen tip 30 is formed between the cavity insert 82 and the core post 81. Because the positioning forming rod 83 abuts against the top of the magnetic element 20, a contact protrusion 40 with an injection auxiliary hole 42 is formed at the pen tip 30. Through the aforementioned adaptability design, on the one hand, the two clamping arms 811 can position the magnetic element 20 during the injection molding process; on the other hand, the pen barrel 10, pen tip 30, snap-fit ​​component 70, contact protrusion 40, and magnetic element 20 can be connected and formed in a single injection molding process. Therefore, it is understandable that the snap-fit ​​component 70 adopts a straight plate-like structure, which not only abuts the magnetic element 20 but also simplifies the production process.

[0052] Compared to existing technologies, the magnetic pen of this invention achieves bidirectional axial positioning and fixation of the magnetic element 20 through the cooperation between the constricting member 50 set in the cavity 50 of the pen tip 30 and the snap-fit ​​member 70 inside the pen barrel 10. This not only completely avoids the problem of easy aging and detachment of traditional adhesive fixing methods, but also significantly improves assembly reliability and service life. The tight fit between the magnetic element 20 and the cavity 50 and the design of the connecting bayonet 71 of the snap-fit ​​member 70 ensure the connection stability of the magnetic element 20, while simplifying the manufacturing process. The pen tip 30 adopts a streamlined shape with a gradually narrowing diameter and a cylindrical contact part 32, which not only meets the ergonomic grip requirements, but also maintains stable contact with the drawing board. In addition, the thickness of the constricting member 50 is precisely controlled to control the distance between the magnetic element 20 and the drawing board, ensuring sufficient magnetic force to achieve handwriting display.

[0053] The above description merely illustrates the preferred technical solution of this utility model, and while the description is relatively specific and detailed, it should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A magnetic attraction pen, characterized by, The pen includes a pen barrel, a pen tip connected to the pen barrel, and a magnetic element installed inside the pen tip. The pen barrel has an inner cavity and includes a snap-fit ​​component fixed to the inner cavity. The pen tip has a contact protrusion at one end away from the pen barrel, and a receiving cavity is provided inside the pen tip. One end of the receiving cavity extends to the contact protrusion, and the other end of the receiving cavity communicates with the inner cavity of the pen barrel. The magnetic element is fixed in the receiving cavity and the inner cavity. The magnetic element has an inner end and an outer end that are disposed opposite to each other. The outer end of the magnetic element abuts against the inner wall of the contact protrusion, and the inner end of the magnetic element abuts against the snap-fit ​​component.

2. The magnetic attraction pen of claim 1, wherein, The magnetic element is arranged in a longitudinal shape and extends along the axial direction of the pen barrel.

3. The magnetic attraction pen of claim 1, wherein, The magnetic element is cylindrical, the accommodating cavity is cylindrical, and the outer wall of the magnetic element is in close contact with the inner wall of the accommodating cavity.

4. The magnetic attraction pen of claim 1, wherein, The inner cavity includes a transition section that connects to the accommodating cavity, and the diameter of the transition section gradually decreases axially from the pen barrel to the pen tip.

5. The magnetic attraction pen of claim 4, wherein, The snap-fit ​​component is arranged in the shape of a vertical plate, and the extension direction of the snap-fit ​​component is the same as the extension direction of the magnetic element.

6. The magnetic attraction pen of claim 5, wherein, The snap-fit ​​component includes a top abutment and connecting ends located on both sides of the top abutment. The top abutment abuts against the inner end of the magnetic element, and the connecting ends are fixedly connected to the inner walls on both sides of the inner cavity.

7. The magnetic attraction pen of claim 6, wherein, The end of the abutment facing the pen tip is provided with a connecting slot, the inner end of the magnetic element is engaged in the connecting slot, and the inner wall of the connecting slot abuts against the outer wall of the magnetic element.

8. The magnetic attraction pen of claim 1, wherein, The snap-fit ​​component and the pen tip are integrally injection molded.

9. The magnetic attraction pen of claim 1, wherein, The contact protrusion is provided with an injection molding auxiliary hole, which is connected to the accommodating cavity; the diameter of the injection molding auxiliary hole is smaller than the outer diameter of the magnetic element.

10. The magnetic attraction pen of claim 1, wherein, The outer edge of the bottom of the contact protrusion is chamfered.

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