Pencil sharpener

Abstract

The utility model relates to the technical field of pencil cutting tools, in particular to a pencil sharpener which is convenient to cut out a pencil connecting structure matched with an extender so as to improve the use convenience and the use comfort, and comprises a pencil sharpener frame, a first blade, a second blade, a first locking screw and a second locking screw, the pencil sharpener frame is provided with a conical hole, the end, with the largest aperture of the conical hole, of the pencil sharpener frame is defined as an insertion end, the pencil sharpener frame is provided with a cutting opening and a chip removal opening which are communicated with the conical hole, and the first blade and the second blade are arranged at the cutting opening. The first blade and the second blade are arranged in the taper hole and are locked on the pencil sharpener frame through a first locking screw and a second locking screw respectively, and the first blade and the second blade are sequentially distributed in the axial direction of the taper hole and are arranged in an inclined mode.

Description

Technical Field

[0001] This utility model relates to the field of pencil cutting tools, and in particular to a pencil sharpener. Background Technology

[0002] Generally, once a pencil is used up to 60%, it becomes very inconvenient for the user to hold, and it is often discarded. This results in a considerable waste of resources. Furthermore, since pencil production consumes a large amount of wood, it also has a significant negative impact on the environment.

[0003] To address this, the industry has designed a device to extend the use of pencils. This device essentially integrates the used pencil tip with the extender, effectively extending the pencil shaft for easier gripping. This minimizes the amount of pencil that is ultimately discarded, thus increasing pencil utilization. For example, Chinese Patent Application No. 201711066919.0 discloses a pencil extender, specifically including an extension rod with a hollow pencil holder at its lower end. Pencils requiring a shorter length are inserted into the pencil holder, increasing the grip length and maximizing the pencil's usability.

[0004] However, the following problems were found during use:

[0005] 1) Inserting the pencil into the pencil holder of the extension rod, the diameter of the extension rod is larger than the diameter of the circumscribed circle of the pencil, which creates a step at the connection point, resulting in poor comfort when using it;

[0006] 2) Furthermore, it does not fit well with other stationery items, such as pen grips, pencil caps, packaging boxes, or pencil sharpeners, requiring the extension rod to be removed before use, resulting in poor ease of use;

[0007] 3) Pencils have a hexagonal prism structure. The standard diameter of the circumscribed circle of a pencil is 8mm. However, the maximum diameter of pencils in actual production may fluctuate between 6.8mm and 8mm. This results in poor connection between the extension rod and the pencil, causing it to wobble when writing. Furthermore, it is easy to insert the pencil too deeply, making it difficult to pull out.

[0008] 4) The weight of the extension rod is usually greater than that of the pencil, which causes the center of gravity of the pencil with the extension rod attached to shift backward, resulting in poor comfort when using it. Utility Model Content

[0009] Therefore, in view of the above problems, this utility model provides a pencil sharpener that is easy to cut out to match the pencil extension, thereby improving the convenience and comfort of use.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A pencil sharpener includes a pencil sharpener holder, a first blade, a second blade, a first locking screw, and a second locking screw. The pencil sharpener holder has a tapered hole, and the end of the pencil sharpener holder with the largest diameter of the tapered hole is defined as the insertion end. The pencil sharpener holder is provided with a cutting port and a chip removal port communicating with the tapered hole. The first blade and the second blade are located at the cutting port and are locked to the pencil sharpener holder by the first locking screw and the second locking screw, respectively. The first blade and the second blade are arranged sequentially along the axial direction of the tapered hole and are inclined.

[0012] Furthermore, a baffle is provided at the end of the pencil sharpener holder away from the insertion end.

[0013] Furthermore, the angle between the first blade and the central axis of the tapered hole is 8° to 30°.

[0014] Furthermore, the angle between the second blade and the central axis of the tapered hole is 8° to 30°.

[0015] Furthermore, the included angle between the first blade, the second blade, and the central axis of the tapered hole is 15°.

[0016] Furthermore, the first blade and the second blade are spaced apart.

[0017] Furthermore, the distance between the first blade and the second blade is 2mm to 10mm.

[0018] Furthermore, the distance between the first blade and the second blade is 4 mm.

[0019] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: When using this pencil sharpener, the rear end of the pencil body is inserted into the insertion end of the pencil sharpener holder and rotated, so that the first blade first cuts the pencil body. Due to the inclined setting of the first blade, as the pencil body feeds inward, the first blade cuts a cylindrical support part and a frustum-shaped tensioning part on the pencil body. Furthermore, the second blade cuts the circumference of the rear end face of the pencil body to form a frustum-shaped inlet part. This allows for the creation of a connection structure that is easy to match with a tubular extension device, making operation simple and convenient. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the pencil body and the extender in an embodiment of this utility model;

[0021] Figure 2 This is a three-dimensional structural diagram of the connecting structure cut out on the pencil body in an embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of an existing pencil body;

[0023] Figure 4 This is a top-view three-dimensional structural diagram of the pencil sharpener in this embodiment of the invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the pencil sharpener holder in an embodiment of this utility model;

[0025] Figure 6 This is a three-dimensional structural diagram of the pencil sharpener in an upward-viewing state according to an embodiment of this utility model. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0027] The embodiment of this utility model is as follows:

[0028] refer to Figure 1 and Figure 2 As shown, a pencil with a connecting structure that mates with an extender includes a pencil body 1 and an extender 2. The extender 2 has a tubular structure, with a through hole 21 at its central axis. The length of the extender 2 is 40mm to 100mm, preferably 63mm. The diameter of the extender 2 is 6mm to 8mm, preferably 7mm. The diameter of the through hole 21 is 4mm to 7.5mm, preferably 6.5mm. One axial end of the pencil body 1 used for writing is defined as the front end, and the other axial end is defined as the rear end. The rear end of the pencil body 1 is provided with a connecting structure 3, which includes an integrally connected tensioning part 31. The pencil body 1 and the extension 2 are connected by a connecting structure 3 inserted into the through hole 21. The tensioning part 31 has a frustum-shaped structure, with a first conical surface 310 on its side. The inclination of the first conical surface 310 is 8° to 30°, preferably 15°. The support part 32 has a cylindrical structure, and its diameter is not greater than the diameter of the through hole 21, preferably equal to the diameter of the through hole 21. The extension 2 has a frustum-shaped structure, with a second conical surface 330 on its side. The inclination of the second conical surface 330 is 8° to 30°, preferably 15°. The pencil body 1 and the extension 2 are connected by a connecting structure 3 inserted into the through hole 21. The diameter of the extension 2 is not greater than the diameter a of the circumscribed circle of the pencil body 1 (reference). Figure 3 As shown), preferably, the diameter of the extender 2 is smaller than the diameter a of the circumcircle of the pencil body 1.

[0029] To ensure the minimum wall thickness required for use, the extender 2 is made of stainless steel tubing with a wall thickness of 0.15mm, brass tubing with a wall thickness of 0.2mm, aluminum tubing with a wall thickness of 0.25mm, PP tubing with a wall thickness of 0.9mm, or aluminum tubing with a wall thickness of 0.25mm. Preferably, it is made of aluminum tubing with a wall thickness of 0.25mm. This makes the extender 2 lightweight, strong, and thin-walled. Thanks to the lightweight aluminum extender, the weight of the pencil body 1 after being fitted with the extender 2 does not exceed the weight of a pencil of the same length, thus providing excellent balance when holding it.

[0030] The connection between the pencil body 1 and the extender 2 is achieved by inserting the connecting structure 3 at the rear end of the pencil body 1 into the through hole 21 of the extender 2, so that the extender 2 is fitted onto the support part 32 to achieve a tight fit. The first conical surface 310 of the tensioning part 31 achieves tension at one end of the extender 2, so that the extender 2 is fixedly connected to the pencil body 1. This method can limit the insertion depth of the pencil body 1, and the diameter of the 7mm extender is less than the diameter a of the circumscribed circle of the 8mm pencil body 1. If the pencil shape (hexagonal, triangular) is placed flat on the table, it will not roll. It can also be used with other stationery, such as pencil grips, pencil caps, packaging boxes, or pencil sharpeners, etc., with high compatibility. There is no need to disassemble the extender. At the same time, the length of the extender 2 is set at 63mm. For some people with larger hands and a higher grip position, the pencil at 110mm feels too short. In this case, by putting on the extender 2, the pencil body 1 is lengthened to 164mm without being too long. 176mm is the initial length of most pencils. If it is extended to more than 176mm, and the length of the pencil sleeve is also taken into account, it may be too long to fit in the pencil case. When the pencil is used to a very short length, such as 30mm, the pencil with the extender 2 is extended to 84mm, which is just enough to be used without being unusable, thus improving the convenience and comfort of use. In addition, the second conical surface 330 of the guide part 33 on the connecting structure 3 facilitates the insertion of the extender 2, further improving the convenience of use.

[0031] In this embodiment, the extension of the pencil body 1 is achieved by the connection structure 3 at its rear end cooperating with the tubular extender 2. However, the connection structure 3 of the pencil body 1 can be pre-cut by the manufacturer during the pencil production process, or the user can cut the connection structure 3 with a knife, or the user can cut the connection structure 3 with a pencil sharpener 4. However, there is no matching pencil sharpener on the market. Therefore, the applicant has developed a matching pencil sharpener 4 for cutting the connection structure 3.

[0032] refer to Figure 4 , Figure 5 and Figure 6As shown, specifically, a pencil sharpener 4 includes a pencil sharpener holder 41, a first blade 42, a second blade 43, a first locking screw 44, and a second locking screw 45. The pencil sharpener holder 41 has a conical hole 5, and the end of the pencil sharpener holder 41 with the largest diameter of the conical hole 5 is defined as the insertion end. The pencil sharpener holder 41 is provided with a cutting port 6 and a chip removal port 7 communicating with the conical hole 5. The first blade 42 and the second blade 43 are located at the cutting port 6 and are locked to the pencil sharpener holder 41 by the first locking screw 44 and the second locking screw 45, respectively. The first blade 42 and the second blade 43 are arranged sequentially along the axial direction of the conical hole 5, with the first blade 42 and the second blade 43 spaced apart. The distance between the first blade 42 and the second blade 43 is 2mm to 10mm, preferably 4mm. The first blade 42 and the second blade 43 are inclined. Preferably, the angle between the first blade 42 and the central axis of the conical hole 5 is 8° to 30°, preferably 15°. The angle between the second blade 43 and the central axis of the conical hole 5 is 8° to 30°, preferably 15°. A baffle 46 is provided at the end of the pencil sharpener holder 41 away from the insertion end.

[0033] In use, the rear end of the pencil body 1 is inserted into the insertion end of the pencil sharpener holder 41 and rotated, causing the first blade 42 to make the first cut on the pencil body 1. Due to the inclined setting of the first blade 42, as the pencil body 1 is fed inward, the first blade 42 cuts a cylindrical support part 32 and a frustum-shaped tensioning part 31 on the pencil body 1. The second blade 43 cuts the periphery of the rear end face of the pencil body 1 to form a frustum-shaped inlet part 33. This allows for the creation of a connection structure that is easy to match with the tubular extension device 2, making the operation simple and convenient.

[0034] In this embodiment, the pencil sharpener holder 41 is made of plastic, but it can also be made of metal, or environmentally friendly recycled plastic made of plastic and other materials (such as limestone, wheat straw, etc.).

[0035] After a period of use, the blade of a regular pencil sharpener tends to dull because the graphite in the lead is much harder than the blade itself, while wood is softer. This means that, under the same frequency of use, the blade for sharpening wood has better durability. This pencil sharpener, with its baffle and tapered hole, only sharpens the wood part of the pencil, avoiding the graphite, making it exceptionally durable.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A pencil sharpener, characterized in that: The device includes a pencil sharpener holder, a first blade, a second blade, a first locking screw, and a second locking screw. The pencil sharpener holder has a tapered hole, and the end of the pencil sharpener holder with the largest diameter in the tapered hole is defined as the insertion end. The pencil sharpener holder is provided with a cutting port and a chip removal port communicating with the tapered hole. The first blade and the second blade are located at the cutting port and are locked to the pencil sharpener holder by the first locking screw and the second locking screw, respectively. The first blade and the second blade are arranged sequentially along the axial direction of the tapered hole and are inclined.

2. The pencil sharpener according to claim 1, characterized in that: The pencil sharpener holder has a baffle at the end away from the insertion end.

3. The pencil sharpener according to claim 1 or 2, characterized in that: The angle between the first blade and the central axis of the tapered hole is 8° to 30°.

4. The pencil sharpener according to claim 3, characterized in that: The angle between the second blade and the central axis of the tapered hole is 8° to 30°.

5. The pencil sharpener according to claim 4, characterized in that: The included angle between the first blade, the second blade and the central axis of the tapered hole is 15°.

6. The pencil sharpener according to claim 1, characterized in that: The first blade and the second blade are spaced apart.

7. The pencil sharpener according to claim 6, characterized in that: The distance between the first blade and the second blade is 2mm to 10mm.

8. The pencil sharpener according to claim 7, characterized in that: The distance between the first blade and the second blade is 4 mm.

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