Externally-hung electric device of pencil sharpener, pencil sharpener assembly and method

Abstract

The invention discloses an externally-hung electric device of a pencil sharpener, a pencil sharpener assembly and a method, the externally-hung electric device comprises a shell and an electric driving device, the electric driving device comprises a power device, a battery and a control circuit board, the electric driving device is arranged in the shell, the shell comprises a mounting side face, a cutting device mounting part is arranged on the mounting side face, and the cutting device mounting part is arranged on the mounting side face. The cutting device installation component comprises a guide ring and an installation opening, a connecting piece is arranged on an output shaft of the electric driving device, the installation opening is formed in the connecting piece, inner teeth are arranged on the inner side wall of the guide ring, the installation opening is used for installing a support of the cutting device, and the inner teeth of the guide ring are used for being matched with outer teeth on the cutting device. The electric pencil sharpener has the advantages that an existing manual pencil sharpener has the electric pencil sharpening function, the use cost of a user is effectively reduced, meanwhile, the pencil sharpening efficiency is improved, and the use requirements in different scenes are met.

Description

Technical Field

[0001] The present invention relates to the field of pencil sharpeners, and in particular to an external electric device of a pencil sharpener, a pencil sharpener assembly and a method. Background Art

[0002] Pencil sharpeners are widely used as learning aids in schools, offices, and homes. They are used to quickly and efficiently sharpen pencils, improving writing and drawing efficiency. With the development of technology, pencil sharpeners are mainly divided into two categories: manual and electric.

[0003] Manual pencil sharpeners rely on manual operation to rotate a crank or press a mechanism to drive the blade to sharpen the pencil. They have advantages such as simple structure, low price, and no need for power supply, making them suitable for low-frequency use or scenarios requiring high portability. However, manual pencil sharpeners rely on manual operation, resulting in slow sharpening speeds. Prolonged use can cause hand fatigue, especially in situations where frequent sharpening is required (such as art painting or extensive writing). Their low efficiency makes them difficult to meet the needs of efficient work.

[0004] Electric pencil sharpeners use a built-in power unit to drive the blade's rotation, enabling automated sharpening. This significantly increases sharpening speed and reduces labor consumption, making them suitable for high-frequency use scenarios such as school classrooms and offices. However, electric pencil sharpeners are typically complex in structure, have high manufacturing costs, and sell for much higher prices than manual sharpeners. They also rely on a power source or battery, increasing their cost and difficulty in maintenance. Furthermore, electric pencil sharpeners are typically large and heavy, making them less portable and unsuitable for mobile use or temporary needs.

[0005] Currently, manual and electric pencil sharpeners exist independently. Users who wish to upgrade from a manual to an electric pencil sharpener typically need to purchase a new electric sharpener, resulting in duplicate investment and high operating costs. Furthermore, switching between sharpeners can involve compatibility issues.

[0006] Therefore, the market urgently needs a low-cost, highly compatible solution that allows users to upgrade to an electric pencil sharpener through a simple external device without replacing the original manual pencil sharpener, thereby taking into account the economy of a manual pencil sharpener and the efficiency of an electric pencil sharpener. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an external electric device and a pencil sharpener assembly for a pencil sharpener, which can be adapted to an existing manual pencil sharpener so that it has an electric pencil sharpening function, effectively reducing the user's usage cost while improving the pencil sharpening efficiency and meeting the usage needs in different scenarios.

[0008] The technical solution adopted by the present invention to solve the above technical problems is: 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 device, a battery and a control circuit board, the electric drive device is arranged in the housing, the housing includes an installation side, and a cutting device installation component is provided on the installation side. The cutting device installation component includes a guide ring and a mounting port, and a connecting piece is provided on the output shaft of the electric drive device. The mounting port is provided on the connecting piece, and the inner side wall of the guide ring is provided with internal teeth. The mounting port is used to install a bracket of the cutting device, and the inner teeth of the guide ring are used to adapt to the external teeth on the cutting device.

[0009] A further preferred embodiment of the present invention is that the manual pencil sharpener includes a manual pencil sharpener housing, a cutting device and a handle. The manual cutting device is removed from the manual pencil sharpener housing and the handle to form the cutting device. The cutting device is fixed to the mounting opening and inserted into the manual pencil sharpener housing. The electric drive device drives the cutting device to rotate to realize the automatic pencil sharpening function of the manual pencil sharpener.

[0010] A further preferred solution of the present invention is that two positioning protrusions are provided on the outer wall of the guide ring, and the positioning protrusions are used to adapt to the positioning grooves of the manual cutting device.

[0011] A further preferred embodiment of the present invention is that a fixed gap is provided on the outer wall of the guide ring, and the fixed gap is provided between the positioning protrusion and the shell surface. After the positioning protrusion is inserted into the positioning groove and rotated, the shell of the manual cutting device is inserted into the fixed gap.

[0012] A further preferred solution of the present invention is that the cutting device protrudes from the front side of the shell body, and the front side is a vertical flat surface.

[0013] A further preferred solution of the present invention is that the guide ring is installed on the front side surface, and a plurality of fixing columns are provided on the rear side of the front side surface, and the fixing columns are connected to the electric drive device.

[0014] A further preferred embodiment of the present invention is that the power device is an electric motor.

[0015] A pencil sharpener assembly, characterized in that it includes the external electric device according to any one of claims 1 to 7, a cutting device and a manual pencil sharpener housing, the cutting device is installed in the mounting port of the external electric device, and the cutting device is then inserted into the manual pencil sharpener housing, the inner teeth of the guide ring and the outer teeth on the cutting device are adapted to realize the manual pencil sharpener having an automatic pencil sharpening function.

[0016] A further preferred embodiment of the present invention is that the outer diameter of the guide ring is the same as the inner diameter of the insertion opening of the manual pencil sharpener housing, the positioning protrusion on the outer wall of the guide ring and the positioning groove of the manual pencil sharpener housing are not at the same height, and after the positioning protrusion passes through the positioning groove, the external electric device and the manual pencil sharpener housing are relatively rotated to achieve fixation.

[0017] A method for realizing an automatic pencil sharpening function for a manual pencil sharpener, characterized by comprising a manual pencil sharpener and an external electric device for the pencil sharpener according to any one of claims 1 to 7, and performing the following operating steps:

[0018] The first step is to remove the cutting device and the handle of the manual pencil sharpener to form a manual pencil sharpener housing, wherein the front side of the manual pencil sharpener housing is provided with an insertion port;

[0019] The second step is to align the bracket of the cutting device with the installation port of the external electric device and fix it;

[0020] In the third step, the guide ring enters the insertion port and is fixed to the manual pencil sharpener housing, and the cutting device is reinserted into the manual pencil sharpener housing;

[0021] Step 4: After the electric drive device is running, the output shaft drives the connecting piece to rotate, and the connecting piece drives the cutting device to rotate through the installation port, thereby realizing the automatic cutting function.

[0022] The external electric device of the present invention integrates a housing and an electric drive unit to achieve an external installation of the electric power source. The side-mounted cutting device mounting assembly cooperates with the connector to precisely secure the cutting device's bracket. The internal teeth of the guide ring mate with the external teeth of the cutting device, ensuring stable power transmission. This allows the cutting device of the manual pencil sharpener to be efficiently driven by the electric drive unit, resolving the issue of inefficient manual operation without having to replace the original pencil sharpener body, reducing upgrade costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional external electric device Figure 1 ;

[0024] Figure 2 A three-dimensional external electric device Figure 2 ;

[0025] Figure 3 This is an exploded view of the external electric device;

[0026] Figure 4 This is a schematic diagram of the assembly of the external electric device and the cutting device;

[0027] Figure 5 This is a schematic diagram of the assembly of the external electric device and the manual pencil sharpener housing;

[0028] Figure 6 A three-dimensional diagram of the manual pencil sharpener housing

[0029] Figure 7 This is a schematic diagram of the completed assembly of the external electric device and the manual pencil sharpener housing; DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0031] like Figure 1-Figure 7 As shown, an external electric device for a pencil sharpener includes a housing 1 and an electric drive device. The electric drive device includes a power unit 3, a battery 4, and a control circuit board 5. The electric drive device is disposed within the housing 1. The housing 1 includes a mounting side 6, on which a cutting device mounting component is disposed. The cutting device mounting component includes a guide ring 8 and a mounting opening 9. A connecting member 11 is disposed on the output shaft 10 of the electric drive device. The mounting opening 9 is disposed on the connecting member 11. The inner sidewall of the guide ring 8 is provided with internal teeth 12. The mounting opening 9 is used to receive a bracket 14 of the cutting device 13. The connecting member 11 is generally provided with an internal thread 15, and the end of the bracket 14 is provided with an external thread 16. The internal threads 15 and the external threads 16 cooperate to achieve fixation. The internal teeth 12 of the guide ring 8 are adapted to match the external teeth 17 on the cutting device 13. This external electric device integrates a housing 1 with an electric drive unit, achieving an externally mounted electric power source. The cutting device mounting assembly on the side 6 cooperates with the connector 11 to precisely secure the bracket 14 of the cutting device 13. The internal teeth 12 of the guide ring 8 mate with the external teeth 17 of the cutting device 13, ensuring stable power transmission. This allows the cutting device 13 of the manual pencil sharpener to be efficiently driven by the electric drive unit, resolving the issue of inefficient manual operation without having to replace the original pencil sharpener body, reducing upgrade costs.

[0032] The manual pencil sharpener includes a manual pencil sharpener housing 18, a cutting device 13, and a handle. The cutting device 13 is formed by removing the manual pencil sharpener housing 18 and the handle. The cutting device 13 is fixed to the mounting port 9 and inserted into the manual pencil sharpener housing 18. The electric drive device drives the cutting device 13 to rotate to realize the automatic pencil sharpening function of the manual pencil sharpener. By removing the cutting device 13 and the handle of the manual pencil sharpener, fixing the cutting device 13 to the external electric device mounting port 9 and reinserting it into the manual pencil sharpener housing 18, a low-cost upgrade solution is achieved by retaining the housing and replacing the drive mode. The electric drive device drives the cutting device 13 to rotate, transforming the manual pencil sharpener into an automated device. This not only utilizes the structural compatibility of the original housing, but also avoids the repeated investment of purchasing a new electric pencil sharpener, thus taking into account both economy and efficiency.

[0033] The outer wall of the guide ring 8 is provided with two positioning protrusions 20, which are designed to fit into the positioning grooves 21 of the manual cutting device. These protrusions 20 on the outer wall of the guide ring 8 mate with the positioning grooves 21 of the manual cutting device, ensuring precise alignment during installation and preventing misalignment of the cutting device 13, which could cause power transmission failure or jamming. This design, through mechanical positioning, enhances the assembly reliability of the external device and the cutting device 13, ensuring stability and durability during electric drive.

[0034] The outer wall of the guide ring 8 also features a fixed gap 22, 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 manual cutting device housing fits into the fixed gap 22. This design enhances the secure connection between the external device and the cutting device 13, preventing loosening caused by pencil sharpening vibrations. The rotational locking mechanism simplifies installation and enhances ease of use.

[0035] The cutting device 13 protrudes from the front side 23 of the housing 1. The front side 23 is a vertical, flat surface. This protrusion ensures precise alignment between the cutting device 13 and the insertion opening of the manual pencil sharpener housing 18. The flat surface fits snugly against the front end face of the manual pencil sharpener housing 18, preventing any movement or offset caused by installation clearance. This protruding structure ensures that the cutting device 13 can be inserted properly into the manual pencil sharpener housing 18 to perform the sharpening operation without disrupting the existing spatial layout.

[0036] The guide ring 8 is mounted on the front side 23, and a plurality of 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.

[0037] Power device 3 is a motor. Using a motor as power device 3 provides stable rotational power, significantly increasing sharpening speed compared to manual cranking, reducing labor consumption, and addressing hand fatigue caused by prolonged manual sharpening. The motor drive can also be controlled by a control circuit board 5 to achieve speed adjustment and automatic start and stop, adapting to different sharpening needs and enhancing user flexibility.

[0038] A pencil sharpener assembly, characterized by including the aforementioned external electric device, a cutting device 13, and a manual pencil sharpener housing 18. The cutting device 13 is inserted into the mounting port 9 of the external electric device, and the cutting device 13 is then inserted into the manual pencil sharpener housing 18. The internal teeth 12 of the guide ring 8 and the external teeth 17 on the cutting device 13 are adapted to each other, thereby enabling the manual pencil sharpener to have an automatic pencil sharpening function. The pencil sharpener assembly forms a detachable electric upgrade solution by integrating the external electric device, the cutting device 13, and the mounting port 9 to secure the cutting device 13. Furthermore, the external device cooperates with the manual housing, achieving a compatible design that allows the addition of electric functions without modifying the original manual pencil sharpener. This allows users to obtain the high efficiency of electric pencil sharpening at a low cost while retaining the portability of a manual pencil sharpener.

[0039] The outer diameter of the guide ring 8 is the same as the inner diameter of the insertion opening 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, the external electric device and the manual pencil sharpener housing 18 are rotated relative to each other to achieve fixation. The outer diameter of the guide ring 8 is the same as the inner diameter of the insertion opening of the manual pencil sharpener housing 18, ensuring that the external electric device fits tightly with the housing 18 during installation, avoiding shaking caused by excessive gaps. The positioning protrusion 20 and the positioning groove 21 of the housing 18 are not at the same height, so that the external electric device can be locked by relative rotation after being inserted into the insertion opening. This insertion and rotation fixing method does not require additional tools, is easy to operate, and has a firm connection, ensuring the accuracy of power transmission between the external electric device and the manual housing.

[0040] A method for realizing an automatic pencil sharpening function for a manual pencil sharpener includes a manual pencil sharpener and an external electric device such as the one described above, and the following operating steps are performed: first, the cutting device 13 and the handle of the manual pencil sharpener are removed to form a manual pencil sharpener housing 18, and the front side of the manual pencil sharpener housing 18 is provided with an insertion port 30; second, the bracket 14 of the cutting device 13 is aligned with the mounting port 9 of the external electric device and fixed; third, the guide ring 8 enters the insertion port 30 and is fixed to the manual pencil sharpener housing 18, and the cutting device 13 is reinserted into the manual pencil sharpener housing 18; fourth, after the electric drive device is operated, the output shaft 10 drives the connecting member 11 to rotate, and the connecting member 11 drives the cutting device 13 to rotate through the mounting port 9, thereby realizing the automatic cutting function. This method upgrades the manual pencil sharpener to an automatic pencil sharpening device through the standardized steps of removing the handle, fixing the cutting device 13, installing the external device, and electrically driving the operation. The operation process is clear and easy to understand, and the user can complete the modification by themselves without professional skills. The step design makes full use of the mechanical positioning structure of the external device to ensure the accuracy and reliability of each step of installation, thereby realizing the electric upgrade of the manual pencil sharpener in a low-cost and highly compatible manner, solving the problems of repeated investment and poor adaptability in the existing technology.

[0041] The above is a detailed introduction to the external electric device, pencil sharpener assembly, and method of a pencil sharpener provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only intended to help understand the present invention and its core concept. It should be noted that, for those skilled in the art, various improvements and modifications may be made to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An external electric device for a pencil sharpener, characterized by: It includes a shell and an electric drive device, which includes a power device, a battery and a control circuit board. The electric drive device is arranged in the shell, and the shell includes an installation side. A cutting device installation component is provided on the installation side. The cutting device installation component includes a guide ring and a mounting port. A connecting piece is provided on the output shaft of the electric drive device. The mounting port is provided on the connecting piece. The inner side wall of the guide ring is provided with internal teeth. The mounting port is used to install a bracket of an external cutting device. The internal teeth of the guide ring are used to adapt to the external teeth on the external cutting device.

2. The external electric device of 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 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. The electric drive device drives the cutting device to rotate to realize 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 Two positioning protrusions are provided on the outer wall of the guide ring, and the positioning protrusions are used to adapt to the positioning grooves 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 provided between the positioning protrusion and the shell surface. After the positioning protrusion is inserted into the positioning groove and rotated, the shell 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 shell body, and the front side is a vertical flat surface.

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

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

8. A pencil sharpener assembly, characterized in that The invention comprises an external electric device, a cutting device and a manual pencil sharpener housing as described in any one of claims 1 to 7, wherein the cutting device is installed in the mounting port of the external electric device, and then the cutting device is inserted into the manual pencil sharpener housing, and the inner teeth of the guide ring and the outer teeth on the cutting device are adapted to realize that the manual pencil sharpener has 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 opening of the manual pencil sharpener housing. The positioning protrusion on the outer wall of the guide ring and the positioning groove of the manual pencil sharpener housing are not at the same height. After the positioning protrusion passes through the positioning groove, the external electric device and the manual pencil sharpener housing are relatively rotated to achieve fixation.

10. A method for realizing automatic pencil sharpening function of a manual pencil sharpener, characterized in that A manual pencil sharpener and an external electric device for a pencil sharpener according to any one of claims 1 to 7 are included, and the following operating steps are performed: The first step is to remove the cutting device and the handle of the manual pencil sharpener to form a manual pencil sharpener housing, wherein the front side of the manual pencil sharpener housing is provided with an insertion port; The second step is to align the bracket of the cutting device with the installation port of the external electric device and fix it; In the third step, the guide ring enters the insertion port and is fixed to the manual pencil sharpener housing, and the cutting device is reinserted into the manual pencil sharpener housing; Step 4: After the electric drive device is running, the output shaft drives the connecting piece to rotate, and the connecting piece drives the cutting device to rotate through the installation port, thereby realizing the automatic cutting function.

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