A pencil sharpener assembly

Abstract

The utility model provides a pencil sharpener assembly for cutting pencil lead, including shell, inner core and blade. Shell is tubular structure, has the open of front end and the rear end installation cavity along the axial extension, inner core is hollow column structure, inserts the installation cavity of shell, and the cavity inner wall is closely matched with the outside surface, and is the plug -in cooperation connection between with shell, can dismantle and set. Blade fixed mounting is in the inner wall of inner core, is arranged along the axial direction of inner core, and its cutting edge is towards the radial below of inner core, and forms the predetermined angle of difference with the inner core axis, is provided with the shavings space in the front of blade, and this space is connected with the open of shell front end. Inner core right end is equipped with the lead core entry, and this entry is communicated with the axial through -hole inside inner core, two cambered surface sections of different taper are set in the axial through -hole in proper order for the lead core of different diameter is introduced to adapt. The compact structure of this assembly is strong, is convenient for dismounts and maintains, is applicable to the cutting operation of many specifications lead core.

Description

Technical Field

[0001] This utility model relates to the field of stationery technology, and in particular to a pencil sharpener assembly for sharpening pencil leads. Background Technology

[0002] Pencil sharpeners, as tools for sharpening lead, are widely used in mechanical pencils, colored pencils, and drawing pens. Traditional pencil sharpeners mostly have a fixed blade, supporting only a single size of lead, lacking versatility. Users need to change to different pencil sharpeners when using multiple sizes of lead, increasing usage costs and inconvenience.

[0003] Furthermore, most existing pencil sharpeners use an integrated structure or glued-on design for the outer shell and blade, making it difficult to guarantee the precision of blade installation and positioning, thus affecting sharpening stability. In some products, the blade is exposed during use, posing a risk of cutting hands and compromising pencil sharpening safety.

[0004] In terms of chip removal structure, many pencil sharpener designs do not fully consider the arrangement of chip space and the discharge path, resulting in chip accumulation and poor discharge. This can easily lead to problems such as chip jamming and uneven chipping during sharpening, affecting the user experience.

[0005] Therefore, existing pencil sharpeners still have room for improvement in terms of adapting to various pencil lead sizes, blade sealing and protection, safe sharpening, and smooth chip removal. There is an urgent need for a pencil sharpener component that is structurally sound, highly compatible, safe to use, and provides smooth sharpening. Utility Model Content

[0006] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a pencil sharpener assembly with a reasonable structure and strong compatibility for sharpening pencil leads.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A pencil sharpener assembly for sharpening pencil leads includes: a housing, an inner core, and a blade. The housing has a cylindrical structure with a front opening and a rear mounting cavity extending axially therefrom. The inner core has a cylindrical hollow structure, is inserted into the mounting cavity, and its outer surface fits tightly against the inner wall of the mounting cavity. The inner core and the housing are connected by a plug-in fit, and the inner core is detachable relative to the housing. The blade is fixedly mounted on the inner wall of the inner core, arranged obliquely along the axial direction of the inner core, with the cutting edge of the blade facing radially downward towards the inner core, and forming a predetermined angle between the blade and the central axis of the inner core. A shaving space is provided in front of the blade, and the shaving space is connected to the opening direction of the housing. An inlet for inserting pencil leads is provided at the right end of the inner core, and the inlet is connected to an axial through hole formed inside the inner core. The axial through hole has two arc-shaped sections with different tapers from right to left, which are used to insert pencil leads of different diameters.

[0008] Furthermore, a planar segment is provided on the top of the outer peripheral surface of the inner core. The planar segment cooperates with the limiting surface provided on the inner wall of the outer shell to limit the rotation of the inner core relative to the outer shell, thereby forming an anti-rotation positioning structure.

[0009] Furthermore, the left side of each of the two arc-shaped sections is provided with an inner opening for chip removal. The inner opening is located on the inner wall of the inner core and is connected to the axial through hole to guide the chips to flow out along the inner wall of the inner core.

[0010] Furthermore, the outer casing is fixedly connected to a connecting part at the end away from the entrance. The connecting part is used to insert an external support rod to realize the installation of the pencil sharpener assembly.

[0011] Furthermore, the connecting part has a graded columnar structure, and its outer circumferential surface is evenly distributed with multiple axially extending ribs.

[0012] Furthermore, a limiting opening is provided on the side wall of the connecting part to cooperate with the limiting structure of the support rod to prevent the pencil sharpener assembly from sliding out of the support rod during use.

[0013] Furthermore, two arc-shaped sections with different tapers are used to adapt to lead cores of different diameters. One arc-shaped section is adapted to lead cores with a diameter of 2.0 mm, and the other arc-shaped section is adapted to lead cores with a diameter of 3.0 mm.

[0014] The aforementioned pencil sharpener assembly, through the plug-in connection between the outer shell and the inner core and the inclined arrangement of the blade, enables the sharpening of pencil leads of different diameters. At the same time, the anti-rotation positioning structure ensures the stability of the blade during the sharpening process. The chip removal openings located on different tapered arc sections improve chip flow. Combined with the structural design and limiting mechanism of the connecting part, the adaptability and installation stability of the pencil sharpener assembly are effectively improved, solving the technical problems of poor versatility and poor chip removal in existing pencil sharpeners. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of the pencil sharpener assembly provided by this utility model; Figure 2 This is a structural schematic diagram of the inner core and blade provided by this utility model. Detailed Implementation

[0016] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] In addition, to clearly illustrate the technical solution of this application, the following are also defined: Figure 1 The top, bottom, left, right, front, and back sides are shown.

[0018] like Figure 1 and Figure 2 As shown, this application provides a pencil sharpener assembly for sharpening pencil leads, including: a housing 1, an inner core 2, and a blade 3.

[0019] The outer shell 1 has a cylindrical structure with a front opening and a rear mounting cavity extending along its axial direction. The inner core 2 has a cylindrical hollow structure that is inserted into the mounting cavity. Its outer surface fits tightly with the inner wall of the mounting cavity. The inner core 2 and the outer shell 1 are connected by a plug-in fit, and the inner core 2 is detachable from the outer shell 1. The blade 3 is fixedly installed on the inner wall of the inner core 2 and is arranged obliquely along the axial direction of the inner core 2. The cutting edge of the blade 3 faces the radial downward direction of the inner core 2, and a predetermined angle is formed between the blade 3 and the central axis of the inner core 2. A chip space is provided in front of the blade 3, which is connected to the front opening of the outer shell 1. The right end of the inner core 2 is provided with an inlet 21 for inserting lead cores. The inlet 21 is connected to an axial through hole formed inside the inner core 2. The axial through hole has two arc-shaped sections 22 with different tapers from right to left, which are used to introduce lead cores of different diameters.

[0020] This invention significantly improves the safety and compatibility of pencil sharpener components during use. The plug-in structure between the outer shell 1 and the inner core 2 facilitates quick disassembly and replacement, eliminating the need for auxiliary fixing processes such as adhesives, reducing assembly costs and improving production efficiency. The blade 3 is fixed to the inner wall of the inner core 2 and arranged at an inclined angle, ensuring a consistent cutting angle and preventing the core from breaking during sharpening, while also preventing direct contact between fingers and the blade, thus improving safety. The inlet 21 of the inner core 2 has two arc-shaped sections 22 with different tapers, achieving compatibility with various pencil lead sizes without adding extra structures, improving product versatility. In addition, the shaving space is connected to the outside, helping to keep the process clean and smooth during use.

[0021] A planar segment is provided on the top of the outer peripheral surface of the inner core 2. This planar segment cooperates with a corresponding limiting surface on the inner wall of the outer shell 1 to restrict the rotation of the inner core 2 relative to the outer shell 1, thereby forming an anti-rotation positioning structure. This anti-rotation structure significantly improves the structural stability of the pencil sharpener assembly during operation. Compared with the traditional method that relies solely on a tight fit, this invention forms a more effective anti-rotation control through mechanical limiting, which not only improves the accuracy and smoothness during cutting but also prevents the blade 3 from shifting or damaging the assembly structure due to the rotation of the inner core 2. In addition, this design has a simple structure, low processing cost, and is easy to integrate into existing pencil sharpener assemblies, making it suitable for mass production.

[0022] Each of the two arc-shaped segments 22 has an inner opening 23 for chip removal on its left side. The inner opening 23 is located on the inner wall of the inner core 2 and communicates with the axial through hole, guiding the chips to flow out along the inner wall of the inner core 2. By providing corresponding chip removal inner openings 23 after multiple arc-shaped segments 22, this invention effectively improves chip removal efficiency, significantly reduces the risk of chip clogging, and enhances the continuous working capability of the product. This structure is simple, does not add extra parts, and achieves the chip removal function through the opening design, making it easy to mold and process.

[0023] The outer casing 1 has a connecting part 4 fixedly connected to the end away from the inlet 21. The connecting part 4 is used to insert an external support rod to install the pencil sharpener assembly. This structural design improves the adaptability and structural integration of the pencil sharpener assembly. The connecting part 4 allows the assembly to be directly installed on mechanical pencils, mechanical stands, or other tools, enabling modularity and quick replacement, and improving the maintainability and upgradeability of the system.

[0024] The connecting part 4 has a graded columnar structure, with multiple axially extending ribs 5 evenly distributed along its outer circumferential direction. This graded columnar structure allows for the adaptation of various support rod specifications, improving the versatility and flexibility of the component. The outer ribs 5 effectively increase connection friction, preventing loosening, and also provide guiding and anti-rotation functions, enhancing the stability and reliability of the connection structure. The overall structure is rationally designed and easy to process, allowing for one-time injection molding, reducing manufacturing costs. This design also enables the pencil sharpener assembly to be quickly replaced and installed at multiple angles, improving the user experience.

[0025] A limiting opening 6 is provided on the side wall of the connecting part 4 to cooperate with the limiting structure of the support rod, preventing the pencil sharpener assembly from slipping off the support rod during use. The limiting opening 6 and the limiting structure of the support rod work together to form an active anti-dislodgement mechanism, which is more stable and reliable than the plug-in method that relies solely on friction or clamping force. This design effectively prevents the assembly from shifting or falling off during the sharpening process, and is particularly suitable for scenarios requiring frequent plugging and unplugging or high-frequency use, improving the user experience and product durability.

[0026] Two arc-shaped sections 22 with different tapers are used to accommodate lead cores of different diameters. One arc-shaped section 22 is suitable for lead cores with a diameter of 2.0mm, and the other arc-shaped section 22 is suitable for lead cores with a diameter of 3.0mm. This utility model integrates two guide arc-shaped sections with different tapers in a single pencil sharpener assembly, enabling it to simultaneously accommodate lead cores of both 2.0mm and 3.0mm diameters. This significantly improves the product's versatility and compatibility, allowing users to sharpen different sizes of lead cores without changing tools, thus enhancing ease of use. Each arc-shaped section provides precise positioning and transition guidance before sharpening, effectively reducing lead core misalignment, breakage, or jamming, and improving sharpening accuracy and stability. It should be understood that if compatibility with more lead core sizes is required, a third taper section (such as one suitable for 1.5mm or 3.2mm lead cores) can be added to form a multi-segment guide structure.

[0027] The above description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A pencil sharpener assembly for sharpening pencil leads, characterized in that, include: The outer casing (1) has a cylindrical structure with a front opening and a rear mounting cavity extending along its axial direction; The inner core (2) has a columnar hollow structure and is inserted into the mounting cavity. Its outer side is tightly fitted with the inner wall of the mounting cavity. The inner core (2) and the outer shell (1) are connected by a plug-in fit, and the inner core (2) is detachable from the outer shell (1). The blade (3) is fixedly installed on the inner wall of the inner core (2) and is arranged obliquely along the axial direction of the inner core (2). The cutting edge of the blade (3) faces the radial downward direction of the inner core (2), and a predetermined angle is formed between the blade (3) and the central axis of the inner core (2). A chip space is provided in front of the blade (3), and the chip space is connected to the opening direction of the outer shell (1). The right end of the inner core (2) is provided with an inlet (21) for inserting a lead core, and the inlet (21) is connected to an axial through hole formed inside the inner core (2); The axial through hole has two arc-shaped sections (22) with different tapers from right to left, which are used to introduce lead cores of different diameters.

2. The pencil sharpener assembly as described in claim 1, characterized in that, The outer periphery of the inner core (2) is provided with a planar segment at the top. The planar segment cooperates with the limiting surface provided on the inner wall of the outer shell (1) to limit the rotation of the inner core (2) relative to the outer shell (1), thereby forming an anti-rotation positioning structure.

3. The pencil sharpener assembly as described in claim 1, characterized in that, The left side of each of the two arc segments (22) is provided with an inner opening (23) for chip removal. The inner opening (23) is located on the inner wall of the inner core (2) and is connected to the axial through hole to guide the chips to flow out along the inner wall of the inner core (2).

4. The pencil sharpener assembly as described in claim 1, characterized in that, The outer casing (1) has a connecting part (4) fixedly connected at one end away from the inlet (21). The connecting part (4) is used to insert an external support rod to realize the installation of the pencil sharpener assembly.

5. The pencil sharpener assembly as described in claim 4, characterized in that, The connecting part (4) has a graded columnar structure, and its outer circumferential surface is evenly provided with multiple axially extending ribs (5).

6. The pencil sharpener assembly as described in claim 5, characterized in that, The connecting part (4) has a limiting opening (6) on its side wall, which is used to cooperate with the limiting structure of the support rod to prevent the pencil sharpener assembly from sliding out of the support rod during use.

7. The pencil sharpener assembly as claimed in claim 1, characterized in that, The two arc-shaped sections (22) with different tapers are used to adapt to lead cores of different diameters. One arc-shaped section (22) is adapted to lead cores with a diameter of 2.0 mm, and the other arc-shaped section (22) is adapted to lead cores with a diameter of 3.0 mm.

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