Automatic closing device for cutting hole of pencil sharpener

Abstract

The utility model belongs to the technical field of pencil sharpeners, particularly relates to an automatic cutting hole closing device of a pencil sharpener, and aims to solve the problems that the existing cutting hole closing device of a traditional pencil sharpener needs to be manually operated, is poor in leakproofness and low in durability, easily causes pencil scrap leakage, is inconvenient to use and the like. A top plate is fixedly installed at the top end of the shell, and a cutting hole for a pen refill to pass through is formed in the top plate. The automatic closing device for the cutting hole of the pencil sharpener further comprises a closing assembly, the closing assembly comprises a beveled round pipe, a steel ball and a magnet block, the beveled end of the beveled round pipe corresponds to the cutting hole, and the steel ball is arranged in the beveled round pipe. Automatic sealing of the cutting hole is achieved, deliberate manual operation is not needed, and use convenience is improved; the device is small in sealing gap, resistant to impact and shaking, capable of ensuring stability and no mistaken opening in long-term use, and capable of meeting the requirements of users.

Description

Technical Field

[0001] This utility model relates to the field of pencil sharpener technology, and in particular to an automatic closing device for the cutting hole of a pencil sharpener. Background Technology

[0002] A pencil sharpener is a tool for sharpening pencils and can be made into various shapes. Existing traditional pencil sharpeners for cutting mechanical pencil leads tend to produce pencil shavings that leak from the cutting hole during the sharpening process. This not only affects the cleanliness of the environment but can also cause inconvenience to the user. Existing sealing devices for the cutting hole mainly include manual flip-top, manual sliding, and manual screw-on closing types. However, these existing sealing devices still have the following drawbacks:

[0003] First, these devices are not fully automated, meaning users need to manually close the cutting holes, which not only increases the complexity of use but may also cause shavings to leak due to improper operation, failing to achieve the effect of keeping hands clean.

[0004] Secondly, the existing devices are not very airtight and can be easily reopened by external forces, causing shavings to leak out. At the same time, these devices are relatively unreliable and may malfunction or be damaged after long-term use, failing to meet the needs of users for long-term use.

[0005] To address the aforementioned problems, this utility model document proposes an automatic closing device for the cutting hole of a pencil sharpener. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies, such as the need for manual operation of the cutting hole sealing device in traditional pencil sharpeners, poor sealing performance, low durability, easy leakage of pencil shavings, and inconvenience in use. Therefore, this invention proposes an automatic closing device for the cutting hole of a pencil sharpener.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An automatic closing device for the cutting hole of a pencil sharpener includes:

[0009] The outer shell has a top plate fixedly installed at its top, and the top plate has a cutting hole for the pen refill to pass through.

[0010] It also includes a sealing component, which includes a beveled tube, a steel ball, and a magnet. One beveled end of the beveled tube corresponds to the cutting hole. The steel ball is placed inside the beveled tube and cooperates with the cutting hole. The magnet is used to magnetically attract and fix the steel ball, so that the steel ball can seal the cutting hole.

[0011] It also includes a bracket, which is fixedly installed on the inner wall of the outer casing. A blade is provided inside the bracket, which is used to cut one end of the pen refill.

[0012] In one possible design, one end of the beveled tube is fixedly connected to the bottom of the top plate, and a through groove is provided on the lower side of the outer wall of the beveled tube. The through groove cooperates with the pen refill to allow the pen refill to pass through normally. The distance between the inner walls on both sides of the through groove is less than the outer diameter of the steel ball to ensure that the steel ball will not fall out of the beveled tube.

[0013] In one possible design, the magnet is fixedly embedded in the bottom of the pen refill, located near the bevel of the beveled tube, and magnetically engages with the steel ball to ensure that the steel ball stably seals the cutting hole.

[0014] In one possible design, the outer diameter of the steel ball is larger than the inner diameter of the cutting hole to ensure that the steel ball does not detach from the cutting hole.

[0015] In one possible design, the bracket has a cutting groove inside, which corresponds to a cutting hole. The cutting groove is used to accommodate one end of the pen refill, and the blade is fixedly installed in the cutting groove to cut one end of the pen refill.

[0016] In one possible design, a base plate is threaded onto the bottom end of the housing, and a hexagonal grip is fixedly mounted on the bottom of the base plate for easy handling of the housing.

[0017] In this application, during use, the user only needs to insert one end of the pen refill into the cutting hole normally. One end of the pen refill can squeeze the steel ball away from the magnetic block's attraction. At this time, one end of the pen refill can pass through the through groove and enter the cutting groove. Then, following the existing way of using a pencil sharpener, the user only needs to complete the relative rotation between the pen refill and the pencil sharpener. Under the action of the blade, one end of the pen refill can be cut. After cutting, the shavings can be stored in the outer casing. Then, the user can pull out the pen refill for normal use. When the user tilts or shakes the pencil sharpener, the steel ball can roll in the beveled tube. When the steel ball approaches the magnetic block, the magnetic block will attract and fix the steel ball, and at this time, the steel ball can just complete the sealing of the cutting hole. Under the restriction of the beveled tube and the magnetic attraction of the magnetic block, the steel ball will not be dislodged from the cutting hole due to any external shaking. Moreover, when the pencil sharpener is tilted or shaken, the steel ball can reach the position of the cutting hole faster than the shavings in the outer casing, which can prevent any fine shavings from leaking out of the cutting hole in normal use environment.

[0018] Beneficial effects: In this utility model, the automatic closing device for the cutting hole of a pencil sharpener achieves automatic closing of the cutting hole by designing a closing component including a beveled round tube, a steel ball, and a magnetic block; during use, the user does not need to deliberately operate manually to automatically complete the closing of the cutting hole, which improves the convenience and automation of use;

[0019] The design of the cutting hole ensures that the lead core can be smoothly inserted and passed through the cutting hole during the cutting process. At the same time, through the cooperation of the magnet and the steel ball, the steel ball can automatically detach from the magnet under the pressure of the lead core, without obstructing the normal passage of the lead core. When the lead core is pulled out, the steel ball can roll in the slanted tube and be attracted and fixed when it is close to the magnet, thereby achieving automatic closure of the cutting hole. This design can automatically close instantly at any tilt angle or shaking that may cause shavings to leak, effectively preventing the leakage of pen shavings.

[0020] In this utility model, the automatic closing device for the cutting hole of a pencil sharpener has a reasonable sealing component design. The sealing gap between the steel ball and the cutting hole is less than 0.005 mm, which ensures a strong sealing force after automatic closing and prevents accidental opening due to external forces such as impact or shaking. At the same time, the overall structure of the device is sturdy and durable, which can meet the needs of users for long-term use.

[0021] In this utility model, the automatic closing device for the cutting hole of the pencil sharpener achieves automatic sealing of the cutting hole through the ingenious cooperation of the oblique round tube, steel ball and magnetic block, without the need for deliberate manual operation, which greatly improves the convenience of use; the device has a small sealing gap, is resistant to impact and shaking, and can ensure stability and prevent accidental opening during long-term use, and the overall structure is sturdy, meeting the long-term needs of users. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of an automatic closing device for the cutting hole of a pencil sharpener proposed in this utility model.

[0023] Figure 2 This is a cross-sectional view of an automatic closing device for the cutting hole of a pencil sharpener proposed in this utility model.

[0024] Figure 3 This is a schematic diagram showing the disassembled structure of an automatic closing device for the cutting hole of a pencil sharpener proposed in this utility model;

[0025] Figure 4 This is a schematic diagram of the oblique-mouthed circular tube structure of an automatic closing device for the cutting hole of a pencil sharpener proposed in this utility model.

[0026] In the diagram: 1. Outer shell; 2. Pen refill; 3. Top plate; 4. Hexagonal grip; 5. Base plate; 6. Support; 7. Cutting groove; 8. Blade; 9. Beveled round tube; 10. Steel ball; 11. Magnet block; 12. Cutting hole; 13. Through groove. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example 1: Refer to Figure 1-4 An automatic closing device includes main structures such as a housing 1, a top plate 3, a closing assembly, a bracket 6, and a blade 8.

[0029] First, in this embodiment, a top plate 3 is fixedly installed at the top of the outer shell 1, and a cutting hole 12 is provided inside the top plate 3 for the pen refill 2 to pass through. This design allows the pen refill 2 to be smoothly inserted and pass through the cutting hole 12 for subsequent cutting operations.

[0030] The sealing assembly is a key component of this embodiment, comprising a beveled tube 9, a steel ball 10, and a magnet 11. One beveled end of the beveled tube 9 corresponds to the cutting hole 12. The steel ball 10 is disposed within the beveled tube 9 and engages with the cutting hole 12. The magnet 11 magnetically holds the steel ball 10 in place, ensuring a stable seal between the steel ball and the cutting hole 12. The sealing gap between the steel ball and the cutting hole is less than 0.005 mm, guaranteeing a good sealing effect.

[0031] Both the top plate 3 and the oblique circular tube 9 are made of non-magnetic materials.

[0032] Furthermore, in this embodiment, one beveled end of the oblique-cut circular tube 9 is fixedly connected to the bottom of the top plate 3. A through groove 13 is provided on the downward-facing side of the outer wall of the oblique-cut circular tube 9. This through groove 13 cooperates with the pen refill 2 to allow the pen refill 2 to pass through normally. At the same time, the distance between the inner walls on both sides of the through groove 13 is less than the outer diameter of the steel ball 10 to ensure that the steel ball 10 will not fall out of the oblique-cut circular tube 9.

[0033] In this embodiment, the magnet 11 is fixedly embedded in the bottom of the outer casing 1 or related structure, and located near the bevel of the beveled tube 9. The magnet 11 and the steel ball 10 are magnetically engaged. When the pen refill 2 is inserted into the cutting hole 12, the steel ball 10 is pushed aside to allow the pen refill 2 to pass through. When the pen refill 2 is pulled out, and the pencil sharpener tilts or shakes, the steel ball 10 rolls inside the beveled tube 9. When the steel ball 10 approaches the magnet 11, it attracts and fixes the steel ball 10. At this time, the steel ball 10 can just block the cutting hole 12, thereby preventing debris or external foreign matter from entering.

[0034] In this embodiment, the outer diameter of the steel ball 10 is larger than the inner diameter of the cutting hole 12. This design ensures that the steel ball 10 will not detach from the cutting hole 12, thereby ensuring the reliability and stability of the sealing assembly.

[0035] In this embodiment, the pencil sharpener with this design is suitable for lead cores of the following diameters, such as 0.9mm, 2.0mm, 3.15mm, 4.0mm, and 5.6mm.

[0036] This application can be used in the field of pencil sharpener technology, or in other fields applicable to this application.

[0037] Example 2: Reference Figure 2 An improvement based on Example 1: an automatic closing device for the cutting hole of a pencil sharpener, which is applied to the field of pencil sharpener technology;

[0038] In this embodiment, the bracket 6 is fixedly installed on the inner wall of the outer casing 1. A cutting groove 7 is provided inside the bracket 6, corresponding to the cutting hole 12, for accommodating one end of the pen refill 2. The blade 8 is fixedly installed within the cutting groove 7 for cutting one end of the pen refill 2. This design makes the cutting process more stable and efficient.

[0039] Finally, in this embodiment, a base plate 5 is threaded onto the bottom end of the outer casing 1, and a hexagonal handle 4 is fixedly mounted on the bottom of the base plate 5. The detachable base plate 5 facilitates the discharge of debris from the pencil sharpener, and the hexagonal handle 4 facilitates the user's handling and operation of the outer casing 1, improving the overall ease of use of the device.

[0040] The working principle and usage process of this technical solution are as follows: During use, the user simply inserts one end of the pen refill 2 into the cutting hole 12. This allows the pen refill 2 to squeeze the steel ball 10 away from the magnet 11, at which point the pen refill 2 can pass through the through groove 13 and enter the cutting groove 7. Following the existing method of using a pencil sharpener, the user only needs to rotate the pen refill 2 relative to the sharpener. Under the action of the blade 8, the pen refill 2 can be cut. After cutting, the shavings can be stored inside the outer casing 1. The user can then remove the pen refill 2 for normal use. The user can then use the pen refill 2 normally. When the blade is tilted or shaken, the steel ball 10 can roll in the beveled tube 9. When the steel ball 10 approaches the magnet 11, the magnet 11 will attract and fix the steel ball 10, and at this time the steel ball 10 can just close the cutting hole 12. Under the restriction of the beveled tube 9 and the magnetic attraction of the magnet 11, the steel ball 10 will not fall out of the cutting hole 12 due to any external shaking. When the pencil sharpener is tilted or shaken, the steel ball 10 can reach the position of the cutting hole 12 faster than the pencil shavings in the outer shell 1, which can prevent any fine pencil shavings from leaking out of the cutting hole 12 in normal use environment.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pencil sharpener automatic closure of the cutting hole, characterized by, Include: The top of the shell (1) is fixedly installed with the top plate (3), the inside of the top plate (3) is provided with a cutting hole (12) for the lead core (2) to pass through; It also includes a sealing assembly, the sealing assembly includes a beveled round pipe (9), a steel ball (10) and a magnet block (11), the beveled end of the beveled round pipe (9) corresponds to the cutting hole (12), the steel ball (10) is arranged in the beveled round pipe (9), the steel ball (10) is matched with the cutting hole (12), the magnet block (11) is used for completing the magnetic attraction of the steel ball (10), and the steel ball (10) is used for completing the sealing of the cutting hole (12).

2. A self-closing device for a cutting hole of a pencil sharpener according to claim 1, wherein The beveled end of the beveled round pipe (9) is fixedly connected with the bottom of the top plate (3), the outer wall of the beveled round pipe (9) is provided with a through groove (13) on the side facing downward, the through groove (13) is matched with the lead core (2), and the normal passing of the lead core (2) is realized.

3. A self-closing device for a cutting hole of a pencil sharpener according to claim 2, wherein The magnet block (11) is fixedly embedded in the bottom of the lead core (2), the magnet block (11) is located at the position close to the bevel of the beveled round pipe (9), the magnet block (11) is matched with the steel ball (10) magnetically, and the sealing of the cutting hole (12) by the steel ball (10) is ensured to be stable.

4. A self-closing device for a cutting hole of a pencil sharpener according to claim 3, wherein The outer diameter of the steel ball (10) is greater than the inner diameter of the cutting hole (12), so as to ensure that the steel ball (10) will not be separated from the cutting hole (12).

5. A self-closing device for a cutting hole of a pencil sharpener according to claim 2, wherein The distance between the inner walls of the two sides of the through groove (13) is less than the outer diameter of the steel ball (10), so as to ensure that the steel ball (10) will not fall off from the beveled round pipe (9).

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