An external motorized device for a pencil sharpener and a pencil sharpener assembly

Abstract

The utility model discloses a kind of outer hanging electric devices and pencil sharpener assembly of pencil sharpener, outer hanging electric device includes shell and electric drive device, electric drive device includes power device, battery and control circuit board, electric drive device is arranged in shell, shell includes installation side, installation side is provided with cutting device installation component, cutting device installation component includes guide ring and installation mouth, the output shaft of electric drive device is provided with connecting piece, the installation mouth is set on connecting piece, the inner side wall of guide ring is provided with internal toothing, installation mouth is used to the support of cutting device, the internal toothing of guide ring is used to and the external tooth on the upper cutting device is adapted, its advantage is to make existing manual pencil sharpener have electric pencil sharpening function, effectively reduce the use cost of user, improve pencil sharpening efficiency simultaneously, meet the use demand under different scenes.

Description

Technical Field

[0001] This utility model relates to the field of pencil sharpeners, and in particular to an external electric device for a pencil sharpener and a pencil sharpener assembly. Background Technology

[0002] A pencil sharpener is a widely used learning aid in schools, offices, and homes, used to quickly and efficiently sharpen pencils, improving writing and drawing efficiency. With technological advancements, pencil sharpeners are mainly divided into two categories: manual pencil sharpeners and electric pencil sharpeners.

[0003] Manual pencil sharpeners rely on manual rotation of a crank or pressing mechanism to drive the blades. They are simple in structure, inexpensive, and require no power source, making them suitable for low-frequency use or scenarios where portability is a priority. However, manual pencil sharpeners depend on manual operation, resulting in a slower sharpening speed. Prolonged use can lead to hand fatigue, especially in situations requiring frequent sharpening (such as art drawing or extensive writing), where their efficiency is low and they cannot meet the demands of high-efficiency work.

[0004] Electric pencil sharpeners use a built-in power unit to drive the blades, achieving automated pencil sharpening. This significantly increases sharpening speed and reduces manual labor, making them suitable for high-frequency use scenarios such as school classrooms and offices. However, electric pencil sharpeners are typically complex in structure, have higher manufacturing costs, and are priced much higher than manual pencil sharpeners. They also require power supplies or batteries, increasing usage costs and maintenance difficulties. Furthermore, electric pencil sharpeners are usually bulky and heavy, making them less portable and unsuitable for mobile use or temporary needs.

[0005] Currently, manual and electric pencil sharpeners exist independently. Users wishing to upgrade from a manual to an electric pencil sharpener typically need to purchase a completely new electric sharpener, resulting in redundant investment and higher operating costs. Furthermore, replacing a pencil sharpener may involve compatibility issues.

[0006] Therefore, there is an urgent need in the market for a low-cost, highly compatible solution that allows users to upgrade to electric operation without replacing their existing manual pencil sharpeners, thus balancing the economy of manual pencil sharpeners with the efficiency of electric pencil sharpeners. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide an external electric device and a pencil sharpener component that can be adapted to existing manual pencil sharpeners, enabling them to have electric pencil sharpening function, effectively reducing user operating costs, improving pencil sharpening efficiency, and meeting the needs of different scenarios.

[0008] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: an external electric device for a pencil sharpener, characterized in that: it includes a housing and an electric drive device, the electric drive device includes a power unit, a battery and a control circuit board, the electric drive device is disposed inside the housing, the housing includes a mounting side, a shaving device mounting component is disposed on the mounting side, the shaving device mounting component includes a guide ring and a mounting port, a connector is disposed on the output shaft of the electric drive device, the mounting port is disposed on the connector, the inner sidewall of the guide ring is provided with internal teeth, the mounting port is used to insert the bracket of the shaving device, and the internal teeth of the guide ring are used to match the external teeth on the shaving device.

[0009] A further preferred embodiment of this utility model is: a manual pencil sharpener includes a manual pencil sharpener housing, a cutting device, and a handle. The cutting device is formed by removing the manual pencil sharpener housing and the handle. The cutting device is fixed to the mounting opening and inserted into the manual pencil sharpener housing. An electric drive device drives the cutting device to rotate, thereby realizing the automatic pencil sharpening function of the manual pencil sharpener.

[0010] A further preferred embodiment of this utility model is: two positioning protrusions are provided on the outer wall of the guide ring, and the positioning protrusions are used to adapt to the positioning groove of the manual cutting device.

[0011] A further preferred embodiment of this utility model is as follows: a fixed gap is also provided on the outer wall of the guide ring. The fixed gap is located between the positioning protrusion and the surface of the housing. After the positioning protrusion is inserted into the positioning groove and rotated, the housing of the manual cutting device is inserted into the fixed gap.

[0012] A further preferred embodiment of this utility model is that the cutting device protrudes from the front side of the housing surface, and the front side is a vertically flat surface.

[0013] A further preferred embodiment of this utility model is as follows: the guide ring is installed on the front side, and a plurality of fixing posts are provided on the rear side of the front side, the fixing posts being connected to an electric drive device.

[0014] A further preferred embodiment of this utility model is that the power device is an electric motor.

[0015] A pencil sharpener assembly is characterized by comprising an external electric device, a cutting device, and a manual pencil sharpener housing. The cutting device is inserted into the mounting port of the external electric device, and then the cutting device is inserted into the manual pencil sharpener housing. The inner teeth of the guide ring and the outer teeth on the cutting device are matched to enable the manual pencil sharpener to have an automatic pencil sharpening function.

[0016] A further preferred embodiment of this utility model is as follows: the outer diameter of the guide ring is the same as the inner diameter of the insertion port of the manual pencil sharpener housing. The positioning protrusion on the outer wall of the guide ring is not at the same height as the positioning groove of the manual pencil sharpener housing. After the positioning protrusion passes through the positioning groove, it fixes the external electric device and the manual pencil sharpener housing by rotating them relative to each other.

[0017] This utility model's external electric device integrates a housing and an electric drive unit to achieve an external power source. The mounting components and connectors on the side of the device precisely fix the cutting device's bracket, and the inner teeth of the guide ring match the outer teeth of the cutting device, ensuring stable power transmission. This allows the cutting device of a manual pencil sharpener to be efficiently driven by the electric drive unit, solving the problem of low efficiency in manual operation, and eliminating the need to replace the original pencil sharpener body, thus reducing upgrade costs. Attached Figure Description

[0018] Figure 1 Three-dimensional for external electric devices Figure 1 ; Figure 2 Three-dimensional for external electric devices Figure 2 ; Figure 3 Exploded view of the external electric actuator; Figure 4 This is an assembly diagram of the external electric actuator and the cutting device; Figure 5 This is an assembly diagram of the external electric actuator and the manual pencil sharpener housing; Figure 6 A 3D view of the casing of a manual pencil sharpener Figure 7 This is a schematic diagram showing the assembled external electric device and manual pencil sharpener housing. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] like Figures 1-7As shown, an external electric device for a pencil sharpener includes a housing 1 and an electric drive unit. The electric drive unit includes a power unit 3, a battery 4, and a control circuit board 5. The electric drive unit is disposed inside the housing 1. The housing 1 includes a mounting side 6, on which a sharpening device mounting component is provided. The sharpening device mounting component includes a guide ring 8 and a mounting port 9. A connector 11 is provided on the output shaft 10 of the electric drive unit. The mounting port 9 is located on the connector 11. The inner sidewall of the guide ring 8 is provided with internal teeth 12. The mounting port 9 is used to insert a bracket 14 of the sharpening device 13. The connector 11 is generally provided with internal threads 15. The end of the bracket 14 is provided with external threads 16. The engagement of the internal threads 15 and the external threads 16 achieves fixation. The internal teeth 12 of the guide ring 8 are adapted to the external teeth 17 on the sharpening device 13. This external electric device integrates the housing 1 with the electric drive unit to achieve an external power source. The mounting components of the shaving device on the side 6 cooperate with the connector 11 to precisely fix the bracket 14 of the shaving device 13. The inner teeth 12 of the guide ring 8 and the outer teeth 17 of the shaving device 13 are matched to ensure stable power transmission. This allows the shaving device 13 of the manual pencil sharpener to be efficiently driven by the electric drive unit, solving the problem of low efficiency in manual operation, and eliminating the need to replace the original pencil sharpener body, thus reducing upgrade costs.

[0021] The manual pencil sharpener includes a manual pencil sharpener housing 18, a sharpening device 13, and a handle. Removing the manual sharpening device from the housing 18 and handle creates the sharpening device 13. The sharpening device 13 is fixed to the mounting port 9 and inserted into the housing 18. An electric drive unit rotates the sharpening device 13, enabling the manual pencil sharpener to automatically sharpen pencils. By removing the sharpening device 13 and handle, fixing it to the external electric device mounting port 9, and re-inserting it into the housing 18, a low-cost upgrade solution is achieved by retaining the housing and replacing the drive mechanism. The electric drive unit rotates the sharpening device 13, transforming the manual pencil sharpener into an automated device. This utilizes the structural compatibility of the original housing while avoiding the redundant investment of purchasing a brand-new electric pencil sharpener, thus balancing economy and efficiency.

[0022] Two positioning protrusions 20 are provided on the outer wall of the guide ring 8. The positioning protrusions 20 are used to fit the positioning grooves 21 of the manual cutting device. The positioning protrusions 20 on the outer wall of the guide ring 8 fit into the positioning grooves 21 of the manual cutting device, which can accurately align them during installation and prevent misalignment of the cutting device 13 from causing power transmission failure or jamming. This design improves the assembly reliability of the external device and the cutting device 13 through a mechanical positioning structure, ensuring stability and durability during electric drive.

[0023] A fixing gap 22 is also provided on the outer wall of the guide ring 8. The fixing gap 22 is located between the positioning protrusion 20 and the surface of the housing 1. After the positioning protrusion 20 is inserted into the positioning groove 21 and rotated, the housing of the manual cutting device is inserted into the fixing gap 22. The fixing gap 22 is located between the positioning protrusion 20 and the surface of the housing 1. After the positioning protrusion 20 is inserted into the positioning groove 21 and rotated, the housing of the manual cutting device can be embedded in the fixing gap 22, forming a double fixing structure of positioning and locking. This design enhances the connection stability between the external device and the cutting device 13, prevents loosening caused by pen vibration, and simplifies the installation process and improves the ease of operation through rotation locking.

[0024] The shaving device 13 protrudes from the front side 23 of the housing 1, which is a vertically flat surface. The protrusion of the shaving device 13 from the front side 23, and the flatness of the front side 23, ensures precise alignment between the shaving device 13 and the insertion port of the manual pencil sharpener housing 18. The flat surface fits tightly against the front end face of the manual pencil sharpener housing 18, preventing wobbling or misalignment caused by installation gaps. This protruding structure ensures that the shaving device 13 can normally extend into the manual pencil sharpener housing 18 to perform the pencil sharpening operation without affecting the original spatial layout.

[0025] A guide ring 8 is mounted on the front side 23, and multiple fixing posts 24 are provided on the rear side of the front side 23. The fixing posts 24 are connected to the electric drive device. The guide ring 8 is mounted on the front side 23 and the fixing posts 24 are provided on the rear side to connect to the electric drive device. The fixing posts 24 can firmly fix the electric drive device in the housing 1.

[0026] The power unit 3 is an electric motor. Using an electric motor as the power unit 3 provides stable rotational power, significantly increasing the pencil sharpening speed compared to a manual crank, reducing manual labor, and solving the hand fatigue problem caused by prolonged manual pencil sharpening. The motor drive can also be controlled via circuit board 5 to adjust the speed or automatically start and stop, adapting to different pencil sharpening needs and improving usage flexibility.

[0027] A pencil sharpener assembly is characterized by comprising the aforementioned external electric device, a shaving device 13, and a manual pencil sharpener housing 18. The external electric device's mounting port 9 is inserted into the shaving device 13, which is then inserted into the manual pencil sharpener housing 18. The inner teeth 12 of the guide ring 8 and the outer teeth 17 of the shaving device 13 are compatible, enabling the manual pencil sharpener to have an automatic pencil sharpening function. This pencil sharpener assembly, by integrating the external electric device, the shaving device 13, and the manual pencil sharpener housing 18, forms a detachable electric upgrade solution. The compatibility of the guide ring 8's inner teeth 12 with the shaving device 13's outer teeth 17, the fixing of the shaving device 13 by the mounting port 9, and the cooperation between the external device and the manual housing achieve a compatible design that allows the addition of electric functionality to an existing manual pencil sharpener without modification. This allows users to obtain the high efficiency of electric pencil sharpening at a low cost while retaining the portability of the manual pencil sharpener.

[0028] The outer diameter of the guide ring 8 is the same as the inner diameter of the insertion port of the manual pencil sharpener housing 18. The positioning protrusion 20 on the outer wall of the guide ring 8 is not at the same height as the positioning groove 21 of the manual pencil sharpener housing 18. After the positioning protrusion 20 passes through the positioning groove 21, it fixes the external electric device and the manual pencil sharpener housing 18 by rotating them relative to each other. The outer diameter of the guide ring 8 is the same as the inner diameter of the insertion port of the manual pencil sharpener housing 18, ensuring that the external device fits tightly with the housing 18 during installation and avoiding excessive gaps that cause shaking. The non-equal height design of the positioning protrusion 20 and the positioning groove 21 of the housing 18 allows the external device to be locked by relative rotation after being inserted into the insertion port. This insertion and rotation fixing method requires no additional tools, is easy to operate, and has a firm connection, ensuring the accuracy of power transmission between the external device and the manual housing.

[0029] A method for automating the sharpening function of a manual pencil sharpener includes a manual pencil sharpener and an external electric drive as described above. The method involves the following steps: First, removing the sharpening device 13 and handle from the manual pencil sharpener to form a manual pencil sharpener housing 18. An insertion port 30 is provided on the front side of the manual pencil sharpener housing 18. Second, aligning and fixing the bracket 14 of the sharpening device 13 with the mounting port 9 of the external electric drive. Third, inserting the guide ring 8 into the insertion port 30 and fixing it to the manual pencil sharpener housing 18, and then re-inserting the sharpening device 13 into the manual pencil sharpener housing 18. Fourth, after the electric drive operates, the output shaft 10 drives the connecting member 11 to rotate. The connecting member 11 drives the sharpening device 13 to rotate through the mounting port 9, thus achieving the automatic sharpening function. This method, through standardized steps of removing the handle, fixing the sharpening device 13, installing the external drive, and operating the electric drive, upgrades a manual pencil sharpener to an automatic pencil sharpener. The operation process is clear and easy to understand, and users can complete the modification themselves without professional technical skills. The step design makes full use of the mechanical positioning structure of the external device to ensure the accuracy and reliability of each installation step, thereby realizing the electric upgrade of manual pencil sharpeners in a low-cost and highly compatible way, solving the problems of repetitive investment and poor adaptability in existing technologies.

[0030] The foregoing has provided a detailed description of the external electric device and components for a pencil sharpener provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are merely for the purpose of helping to understand this utility model and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An external electric device for a pencil sharpener, characterized in that: The device includes a housing and an electric drive unit. The electric drive unit includes a power unit, a battery, and a control circuit board. The electric drive unit is housed within the housing. The housing includes a mounting side, on which a cutting device mounting component is provided. The cutting device mounting component includes a guide ring and a mounting port. A connector is provided on the output shaft of the electric drive unit. The mounting port is located on the connector. The inner sidewall of the guide ring has internal teeth. The mounting port is used to insert a bracket for the cutting device. The internal teeth of the guide ring are adapted to match the external teeth on the external cutting device.

2. The external electric device for a pencil sharpener according to claim 1, characterized in that... The manual pencil sharpener includes a manual pencil sharpener housing, a cutting device, and a handle. The cutting device is formed after removing the manual pencil sharpener housing and handle. The cutting device is fixed to the mounting hole and inserted into the manual pencil sharpener housing. The electric drive device drives the cutting device to rotate, thereby realizing the automatic pencil sharpening function of the manual pencil sharpener.

3. The external electric device for a pencil sharpener according to claim 1, characterized in that... The outer wall of the guide ring is provided with two positioning protrusions, which are used to fit the positioning groove of the manual cutting device.

4. The external electric device for a pencil sharpener according to claim 2, characterized in that... A fixed gap is also provided on the outer wall of the guide ring. The fixed gap is located between the positioning protrusion and the surface of the housing. After the positioning protrusion is inserted into the positioning groove and rotated, the housing of the manual cutting device is inserted into the fixed gap.

5. The external electric device for a pencil sharpener according to claim 1, characterized in that... The cutting device protrudes from the front side of the housing surface, and the front side is a vertically flat surface.

6. The external electric device for a pencil sharpener according to claim 4, characterized in that... The guide ring is mounted on the front side, and multiple fixing posts are provided on the rear side of the front side, with the fixing posts connected to the electric drive device.

7. The external electric device for a pencil sharpener according to claim 1, characterized in that... The power unit mentioned is an electric motor.

8. A pencil sharpener assembly, characterized in that... The device includes an external electric device, a cutting device, and a manual pencil sharpener housing as described in any one of claims 1-7. The cutting device is inserted into the mounting port of the external electric device, and then the cutting device is inserted into the manual pencil sharpener housing. The inner teeth of the guide ring and the outer teeth on the cutting device are matched to enable the manual pencil sharpener to have an automatic pencil sharpening function.

9. A pencil sharpener assembly according to claim 8, characterized in that... The outer diameter of the guide ring is the same as the inner diameter of the insertion port of the manual pencil sharpener housing. The positioning protrusion on the outer wall of the guide ring is not at the same height as the positioning groove of the manual pencil sharpener housing. After the positioning protrusion passes through the positioning groove, it fixes the external electric device and the manual pencil sharpener housing by rotating them relative to each other.

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