Pencil with connecting structure matched with extender
Through the conical connection structure of the pencil and the extender and the lightweight material design, the pencil extension device is solved, and the pencil extension device is highly adaptable and balanced with the stationery, extending the service life of the pencil.
Patent Information
- Application Number
- CN202422381891.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-09-29
AI Technical Summary
The existing pencil extension devices have problems such as poor comfort in use, poor adaptability to other stationery, poor connection density, and unstable center of gravity, which affects the convenience and comfort of use.
A connection structure between pencil and extender is designed, including a tightening part, a support part and an inlet part. It adopts a tapered surface design to ensure tight fit and adaptability. It maintains the center of gravity balance through lightweight materials such as aluminum extenders, and uses a special pencil sharpener to produce the cutting connection structure.
It improves the convenience and comfort of pencils, is suitable for other stationery, does not need to remove the extension, has good balance in the center of gravity, is suitable for extension, avoids problems of too long or too short, and enhances the service life of pencils.
Smart Images
Figure CN223266525U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pencils, in particular to a pencil with a connection structure matched with an extender. Background Art
[0002] Generally, after a pencil has been used for more than 60%, it becomes very inconvenient for the user to hold it, and the user often discards it. This causes a considerable waste of resources. Moreover, since pencil production consumes a large amount of wood, it also has a huge adverse impact on the environment.
[0003] To this end, the industry has also designed a device for extending the use of pencils. The device mainly integrates the remaining pencil tip with the extender, which is equivalent to extending the pencil shaft for easier gripping. This reduces the amount of discarded pencils and improves the utilization rate of the pencil. For example, Chinese patent application No. 201711066919.0 discloses a pencil extender, which specifically discloses an extension rod with a hollow pencil holder at the lower end. A shorter pencil is inserted into the pencil holder of the extension rod, thereby increasing the grip length of the pencil and allowing the pencil to be fully utilized.
[0004] However, the following problems were found during use:
[0005] 1) When a pencil is inserted 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, so that a step is formed at the connection, resulting in poor user comfort;
[0006] 2) It is not compatible with other stationery items, such as pen holders, pencil caps, packaging boxes, or pencil sharpeners, and requires the extension rod to be removed before use, making it inconvenient to use;
[0007] 3) Pencils are hexagonal prisms. The standard circumscribed diameter of a typical pencil is 8 mm. However, the maximum diameter of pencils in actual production can fluctuate between 6.8 mm and 8 mm. This results in a poor connection between the extension barrel and the pencil, which can easily cause shaking during writing. Furthermore, the pencil can be inserted too deeply, making it difficult to remove.
[0008] 4) The weight of the extension rod is usually greater than the weight of the pencil, which causes the center of gravity of the pencil installed with the extension rod to move backward, resulting in poor comfort in use. Utility Model Content
[0009] Therefore, in order to solve the above problems, the present invention provides a pencil having a connection structure matched with an extender, which is convenient to use and comfortable to use.
[0010] In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0011] A pencil having a connection structure for cooperating with an extender, comprising a pencil body and an extender. The extender is tubular, with a through hole extending therethrough at the central axis of the extender. The axial end of the pencil body used for writing is defined as the front end, and the other axial end of the pencil body is defined as the rear end. The rear end of the pencil body is provided with a connection structure, the connection structure comprising an integrally connected tensioning portion and a supporting portion. The tensioning portion is a truncated cone-shaped structure, with a side surface of the tensioning portion having a first tapered surface, the inclination of the first tapered surface being 8° to 30°. The supporting portion is cylindrical, with a diameter of the supporting portion not greater than that of the through hole. The pencil body and the extender are connected by inserting the connection structure into the through hole. The diameter of the extender is not greater than that of the circumscribed circle of the pencil body.
[0012] Furthermore, the connection structure further includes an introduction portion at the rear end of the pencil body, the introduction portion is a truncated cone structure, so that the introduction portion has a second tapered surface, and the inclination of the second tapered surface is 8° to 30°.
[0013] Furthermore, the inclination of the first conical surface and the second conical surface is 15°.
[0014] Furthermore, the length of the extender is 40 mm to 100 mm.
[0015] Furthermore, the length of the extender is 63 mm.
[0016] Furthermore, the diameter of the extender is 6 mm to 8 mm.
[0017] Furthermore, the diameter of the extender is 7 mm.
[0018] Furthermore, the diameter of the through hole is 4 mm to 7.5 mm.
[0019] Furthermore, the diameter of the through hole is 6.5 mm.
[0020] By adopting the above technical solution, the beneficial effects of the utility model are as follows: the pencil having a connection structure that cooperates with the extender is inserted into the through hole of the extender, so that the extender is sleeved on the support portion to achieve a tight fit, and the first conical surface of the tensioning portion is used to tighten one end of the extender, so that the extender is fixedly connected to the pencil body. This method can limit the insertion depth of the pencil body, and the diameter of the 7mm extender is smaller than the diameter of the circumscribed circle of the 8mm pencil body. 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 pen holders, pencil caps, packaging boxes, or pencil sharpeners, with high adaptability, without the need to remove the extender. At the same time, the extender is set to a length of 63mm. For some people with larger palms and a higher pen grip, the pencil feels too short at 110mm. At this time, with the extender, the pencil body is extended to 164mm, which is not too long. 176mm is the initial length of most pencils. If extended beyond 176mm, the pencil may be too long to fit into a pencil case, taking into account the length of the pencil case. When the pencil is used to a very short length, for example 30mm, the pencil with the extender increases to 84mm, which is just enough length to be usable without being unusable, thus improving the convenience and comfort of use. In addition, the second tapered surface of the introduction portion of the connecting structure facilitates the introduction of the extender, further improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the pencil body and the extender in the embodiment of the utility model;
[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of a pencil body with a connecting structure cut out in an embodiment of the present utility model;
[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of an existing pencil body;
[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of the pencil sharpener in a top view according to an embodiment of the present invention;
[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of the pencil sharpener in the embodiment of the present utility model;
[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the pencil sharpener in an embodiment of the utility model when viewed from above. DETAILED DESCRIPTION
[0027] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.
[0028] The embodiments of the present utility model are:
[0029] refer to Figure 1 and Figure 2 As shown, a pencil having a connection structure for cooperating with an extender includes a pencil body 1 and an extender 2. The extender 2 is tubular in structure, with a through hole 21 extending through the center axis of the extender 2. The length of the extender 2 is 40 mm to 100 mm, preferably 63 mm, the diameter of the extender 2 is 6 mm to 8 mm, preferably 7 mm, the diameter of the through hole 21 is 4 mm to 7.5 mm, preferably 6.5 mm. The axial end of the pencil body 1 used for writing is defined as the front end, and the other axial end of the pencil body is defined as the rear end. The rear end of the pencil body 1 is provided with a connection structure 3, and the connection structure 3 includes an integrally connected tensioning portion 31. , a support portion 32 and an introduction portion 33, the tensioning portion 31 is a truncated cone structure, so that the side of the tensioning portion 31 has a first tapered surface 310, the inclination of the first tapered surface 310 is 8° to 30°, preferably 15°, the support portion 32 is a cylindrical structure, the diameter of the support portion 32 is not greater than the diameter of the through hole 21, preferably the diameter of the support portion 32 is equal to the diameter of the through hole 21, the introduction portion 33 is a truncated cone structure, so that the introduction portion 33 has a second tapered surface 330, the inclination of the second tapered surface 330 is 8° to 30°, preferably 15°, the pencil body 1 and the extender 2 are connected by inserting the through hole 21 through the connecting structure 3, and the diameter of the extender 2 is not greater than the diameter a of the circumscribed circle of the pencil body 1 (reference Figure 3 As shown), it is preferred that the diameter of the extender 2 is smaller than the diameter a of the circumscribed circle of the pencil body 1.
[0030] To ensure the minimum wall thickness while ensuring the strength in use, the extender 2 is a stainless steel tube with a wall thickness of 0.15 mm, a brass tube with a wall thickness of 0.2 mm, an aluminum tube with a wall thickness of 0.25 mm, a PP tube with a wall thickness of 0.9 mm, or an aluminum tube with a wall thickness of 0.25 mm, preferably an aluminum tube with a wall thickness of 0.25 mm. This makes the extender 2 light in weight, high in strength, and thin in wall thickness. Thanks to the lightweight aluminum extender, the weight of the pencil body 1 after the extender 2 is attached does not exceed the weight of a pencil of the same length, thus providing an excellent center of gravity balance when gripping.
[0031] The pencil body 1 and the extender 2 are connected 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 sleeved on the support portion 32 to achieve a tight fit. The first tapered surface 310 of the tensioning portion 31 is used to tighten 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. The diameter of the 7mm extender is smaller than the diameter a of the circumscribed circle of the 8mm pencil body 1. If the shape of the pencil (hexagonal, triangular) is placed flat on the table, it will not roll. It can also be used with other stationery such as pen holders, pencil caps, packaging boxes or pencil sharpeners, with high adaptability, without the need to remove the extender. At the same time, the extender 2 is set to a length of 63mm. For some people with larger palms and a higher pen grip, the pencil feels short at 110mm. At this time, with the extender 2, the pencil body 1 is extended to 164mm, which is not too long. 176 mm is the initial length of most pencils. If the pencil exceeds 176 mm after extension, the pencil may be too long to fit into a pencil case when the length of the pencil cover is taken into account. When the pencil is used to a very short length, for example 30 mm, the pencil with the extender 2 is extended to 84 mm, which is just enough length to be used without being unusable, thereby improving the convenience and comfort of use. In addition, the second tapered surface 330 of the introduction portion 33 of the connecting structure 3 facilitates the introduction of the extender 2, further improving the convenience of use.
[0032] In this embodiment, the pencil body 1 is extended by the connection structure 3 provided at the rear end thereof in cooperation with the tubular extender 2. However, the connection structure 3 of the pencil body 1 can be pre-cut during the production process of the pencil by the manufacturer, 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 are no suitable pencil sharpeners on the market. Therefore, the applicant has developed a suitable pencil sharpener 4 for cutting the connection structure 3.
[0033] 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 tapered hole 5, and the end of the pencil sharpener holder 41 with the largest aperture in the tapered hole 5 is defined as the insertion end. The pencil sharpener holder 41 is respectively provided with a cutting opening 6 and a chip removal opening 7 connected to the tapered hole 5. The first blade 42 and the second blade 43 are provided at the cutting opening 6 and are respectively locked to the pencil sharpener holder 41 by the first locking screw 44 and the second locking screw 45. The first blade 42 and the second blade 43 are sequentially distributed along the axial direction of the tapered hole 5, and the first blade 42 and the second blade 43 are spaced apart. Distribution, the distance between the first blade 42 and the second blade 43 is 2mm~10mm, preferably, the distance between the first blade 42 and the second blade 43 is 4mm, the first blade 42 and the second blade 43 are arranged at an angle, preferably, the angle between the first blade 42 and the central axis of the tapered hole 5 is 8°~30°, preferably, the angle between the first blade 42 and the central axis of the tapered hole 5 is 15°, the angle between the second blade 43 and the central axis of the tapered hole 5 is 8°~30°, preferably, the angle between the second blade 43 and the central axis of the tapered hole 5 is 15°, and a baffle 46 is provided on the end of the pencil sharpener 41 away from the insertion end.
[0034] When using the present pencil sharpener, 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 perform a first cut on the pencil body 1. Due to the inclined arrangement of the first blade 42, as the pencil body 1 is fed inward, the first blade 42 cuts a cylindrical support portion 32 and a truncated cone-shaped tensioning portion 31 on the pencil body 1. The second blade 43 then cuts the circumference of the rear end surface of the pencil body 1 to form a truncated cone-shaped introduction portion 33. This allows for a connection structure that is easily compatible with the tubular extender 2, resulting in simple operation and convenient use.
[0035] In this embodiment, the pencil sharpener 41 is made of plastic, but may also be made of metal, or environmentally friendly recycled plastic composited with plastic and other materials (such as limestone, wheat straw, etc.).
[0036] The blade of a regular pencil sharpener, responsible for sharpening the lead, tends to become blunt after a period of use. This is because the graphite in the lead is much harder than the blade, while the wood is less hard than the blade. Consequently, with the same frequency of use, the blade sharpening the wood has greater durability. The baffle and tapered hole ensure that this sharpener only sharpens the wood portion of the pencil, leaving the graphite portion untouched, making it extremely durable.
[0037] 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.
[0038] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.
[0039] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.
[0040] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.
Claims
1. A pencil having a connection structure for cooperating with an extender, characterized in that: The invention comprises a pencil body and an extender. The extender has a tubular structure, with a through hole extending through the extender at its central axis. The axial end of the pencil body used for writing is defined as the front end, and the other axial end of the pencil body is defined as the rear end. The rear end of the pencil body is provided with a connecting structure, which includes an integrally connected tensioning portion and a supporting portion. The tensioning portion has a truncated cone structure, with a side surface of the tensioning portion having a first tapered surface, and an inclination of the first tapered surface of 8° to 30°. The supporting portion has a cylindrical structure, and a diameter of the supporting portion is no greater than that of the through hole. The pencil body and the extender are connected by inserting the connecting structure into the through hole. The diameter of the extender is no greater than that of the circumscribed circle of the pencil body.
2. The pencil having a connection structure for cooperating with an extender according to claim 1, characterized in that: The connection structure further comprises an introduction portion at the rear end of the pencil body. The introduction portion is in a truncated cone structure, so that the introduction portion has a second tapered surface. The inclination of the second tapered surface is 8° to 30°.
3. The pencil having a connection structure for cooperating with an extender according to claim 2, characterized in that: The inclination of the first tapered surface and the second tapered surface is 15°.
4. The pencil having a connection structure for cooperating with an extender according to any one of claims 1 to 3, characterized in that: The length of the extender is 40 mm to 100 mm.
5. The pencil having a connection structure for cooperating with an extender according to claim 4, characterized in that: The length of the extender is 63mm.
6. The pencil having a connection structure for cooperating with an extender according to any one of claims 1 to 3, characterized in that: The diameter of the extender is 6mm to 8mm.
7. The pencil having a connection structure for cooperating with an extender according to claim 6, characterized in that: The diameter of the extender is 7 mm.
8. The pencil having a connection structure for cooperating with an extender according to any one of claims 1 to 3, characterized in that: The diameter of the through hole is 4 mm to 7.5 mm.
9. The pencil having a connection structure for cooperating with an extender according to claim 8, characterized in that: The diameter of the through hole is 6.5 mm.
Citation Information
Patent Citations
Pencil extender
CN109720129A