A shockproof pen tip, pen refill, and pen

Abstract

A shockproof pen tip, refill, and pen; this invention first employs a double-ball and extension design to improve writing smoothness and ink uniformity, and further prevents the ball from being easily damaged. Based on this, a ball seat portion connected to the front end of the first channel, along with a recess and support portion formed by dot-matrix stamping, are further designed to enhance shock resistance. The recess is positioned such that its front end is in front of the secondary ball's front end, and its rear end is behind the secondary ball's rear end. Unlike existing technologies that only support the main ball, this design utilizes the vertical direction of the entire ball seat portion for support, greatly improving support strength. Ultimately, this solution simultaneously ensures smooth writing and shock resistance, effectively enhancing the user experience.

Description

Technical Field

[0001] This utility model belongs to the field of stationery technology, specifically, it relates to a drop-proof pen tip, pen refill, and pen. Background Technology

[0002] For students in particular, writing pens are one of the most common stationery items in their daily school life. As for writing pens, their quality is mainly determined by two aspects: writing smoothness and drop resistance.

[0003] In some existing writing pen tip structures, the high hardness of the tip results in a stiff and less smooth writing experience. Furthermore, the poor flexibility of the tip makes it unsuitable for prolonged writing due to insufficient drop resistance. Therefore, some manufacturers have designed corresponding tip and refill structures to address these issues.

[0004] For example, in the utility model patent CN217574649U, "A pen tip assembly, pen refill and ballpoint pen", in order to solve the problem of writing smoothness, a double ball design is adopted in the pen tip. At the same time, a spring is used to guide the ball to naturally release ink when it is under pressure. When writing, the ball is not exposed to the air, the ink does not dry easily, and the performance of intermittent writing is further improved.

[0005] However, it is clear that the above structural design did not take into account the impact resistance, especially the outer writing ball, which is supported only by a common bowl-shaped ball seat. When the pen, especially the nib, is dropped on the ground face down, it is obvious that the ball will be damaged. In particular, in the double ball structure, even if the outer ball is not damaged, the inner ball can easily change position, causing ink blockage and affecting the normal writing use of the pen.

[0006] For example, in the utility model patent CN217532348U, "Anti-drop syringe pen tip and related pen refill and pen", a structural design was made at the bowl of the ball seat, and three dotting indentations were designed on the outside of the ball seat to improve the overall anti-drop performance. At the same time, the angle design was made to meet the requirements of smooth writing.

[0007] However, the problem with this solution is that it is far inferior to the double ball structure designed in the first utility model patent, "A pen tip assembly, pen core and ballpoint pen", in terms of writing smoothness and comfort. The angle design can only play a small role, and there is still room for improvement in terms of ink stability and sustainability.

[0008] Finally, in the utility model patent "A Ballpoint Pen" with publication number CN216915306U, the ballpoint pen was designed in detail to address the issues of pen tip durability and uneven writing. The ball seat, especially the constriction, was designed with angles and corresponding curves to improve the uniformity and stability of ink flow.

[0009] However, this solution has two problems. First, as mentioned in the background section, "when the pen tip is tilted at an angle of less than 90° to the ground after being lowered, the ballpoint pen is prone to falling out of the pen tip, causing the pen tip to break." In reality, if such a fall occurs, the more likely problem is that the ballpoint pen is impacted into the ball bearing, causing the ink path to become blocked. Simultaneously, the ballpoint pen cannot rotate normally, thus preventing proper writing. The issue is that the ball bearing cannot provide adequate support for the ballpoint pen, rather than the ballpoint pen easily falling out of the ball bearing. Therefore, the design of this solution focuses more on preventing the ballpoint pen from falling out of the ball bearing, rather than improving the support performance of the ball bearing. Second, this solution is far less smooth in terms of writing compared to the double-ball structure designed in the first utility model patent, "A Pen Tip Assembly, Pen Core, and Ballpoint Pen." The double-ball design, combined with a spring, allows for more even ink flow and more stable and reliable writing.

[0010] In conclusion, none of the current technologies can simultaneously achieve both smooth writing and drop resistance; they all have certain shortcomings to varying degrees. Utility Model Content

[0011] In view of the above-mentioned problems existing in the prior art, the purpose of this utility model is to provide a drop-proof pen tip, pen refill, and pen.

[0012] To solve the above problems, the technical solution adopted by this utility model is as follows: A drop-resistant pen tip includes a ball seat portion and a channel portion connected together. The channel portion includes a first channel and a second channel. The front end of the first channel is connected to the rear end of the ball seat portion, and the outer diameter of the front end of the first channel is the same as the outer diameter of the rear end of the ball seat portion. The outer diameter of the first channel gradually increases from the front end to the rear end. The front end of the second channel is connected to the rear end of the first channel. The front end of the ball seat supports the main ball, and a secondary ball is located directly behind the main ball inside the ball seat. A spring is provided in the second channel, and the front end of the spring has a straight extension. The extension passes through the first channel to reach the interior of the ball seat and abuts against the secondary ball. A plurality of recesses formed by dot stamping are evenly distributed around the outer surface of the ball seat, and a protruding support portion is formed inside the ball seat. The front end of the support portion forms a bowl-shaped opening to support the main ball, and the rear end of the support portion is connected to the front end of the first channel.

[0013] Furthermore, the front end of the ball seat portion has an inwardly inclined tapering portion.

[0014] Furthermore, the front end face of the constricted portion is horizontal; The angle between the outer side of the constricted portion and the front end face of the constricted portion is defined as ∠α1; The angle between the inner side of the constricted portion and the front end face of the constricted portion is defined as ∠β1; The ∠α1 < ∠β1.

[0015] Furthermore, the angle between the tangent formed by the outer edge of the constricted portion and the main ball bead and the front end face of the constricted portion is defined as ∠α2; Define the angle between the tangent formed by the inner side of the constricted portion and the main ball and the front end face of the constricted portion as ∠β2; ∠α1>∠α2, ∠β1>∠β2.

[0016] Furthermore, the pit is truncated cone-shaped.

[0017] Furthermore, the front end of the recess is located in front of the front end of the sub-ball, and the rear end of the recess is located behind the rear end of the sub-ball.

[0018] Furthermore, both the main ball and the secondary ball are made of tungsten carbide, and the ball seat is made of zirconium-nickel alloy.

[0019] A shockproof pen refill includes the aforementioned shockproof pen tip and a pen refill tube. The internal cavity of the pen refill tube contains ink, and the internal cavity of the pen refill tube is connected to the second channel.

[0020] Furthermore, the anti-drop pen tip is installed at the front end of the pen refill tube via a connector, which is stepped.

[0021] A shock-resistant pen, comprising the aforementioned shock-resistant pen refill.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention first employs a double-bead and extension design to improve writing smoothness and ink uniformity, and further prevents the beads from being easily damaged. Building upon this, it further designs a ball seat portion that connects to the front end of the first channel, along with a recess and support portion formed by dotting and stamping to enhance drop resistance. The recess is positioned such that its front end is in front of the secondary bead's front end, and its rear end is behind the secondary bead's rear end. Unlike existing technologies that only support the main bead, this invention utilizes the vertical direction of the entire ball seat portion for support, significantly improving support strength. Attached Figure Description

[0023] Figure 1 A schematic diagram of the overall structure of the pen tip to prevent it from falling; Figure 2 A schematic diagram of the internal cross-sectional structure of a drop-resistant pen tip; Figure 3 for Figure 2 A partial structural diagram at point A in the middle; Figure 4 and Figure 5 All Figure 2 A schematic diagram of the local structure at point B; Figure 6 This is a schematic diagram of the connector structure; In the diagram: 1-ball seat; 2-channel; 3-first channel; 4-second channel; 5-main ball; 6-secondary ball; 7-spring; 8-extension; 9-recess; 10-support; 11-closing; 12-connector; 121-front step; 122-rear step; 123-support. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments.

[0025] like Figure 1-6 As shown, the anti-drop pen tip of this utility model first includes a ball seat 1 and a channel 2 that are connected to each other. As the name suggests, the ball seat 1 is used to support the ball, and the channel 2 is used to contain the ink.

[0026] First, the channel section 2 includes a first channel 3 and a second channel 4. The ball seat section 1 is initially located at the front end of the channel section 2, thereby connecting the front end of the first channel 3 to the rear end of the ball seat section 1. The outer diameter of the front end of the first channel 3 is the same as the outer diameter of the rear end of the ball seat section 1. At the same time, the outer diameter of the first channel 3 gradually increases from the front end to the rear end, forming an inverted hourglass shape. The front end of the second channel 4 is connected to the rear end of the first channel 3, and the second channel 4 as a whole is rectangular in shape.

[0027] As can be seen from the prior art mentioned in the background section, in this solution, the ball seat 1 does not only refer to the small part of the structure that supports the ball, but the part in front of the channel is the ball seat 1. The purpose of this design will be explained later.

[0028] The main ball 5 is supported at the front end of the ball seat 1, while the secondary ball 6 is located inside the ball seat 1, directly behind the main ball 5. As can be seen from the figure, the main ball 5 is significantly larger than the secondary ball 6, and the two are coaxially arranged one in front of the other. Furthermore, the main ball 5 is supported by the rim of the ball seat 1, while the secondary ball 6 is located in the middle of the ball seat 1, surrounded on all sides, and supported at its rear end by a separate spring 7.

[0029] Correspondingly, a spring 7 is provided in the second channel 4. The spring 7 has a straight extension 8 at its front end. The extension 8 passes through the first channel 3 to reach the interior of the ball seat 1 and abuts against the secondary ball 6.

[0030] As can be seen from this, the scheme adopts a double ball structure design, and unlike the prior art CN217574649U, the rear of the secondary ball 6 is not directly connected to the spring 7, but is connected through a vertical extension 8. This extension 8 starts from the second channel 4, passes directly through the first channel 3 and reaches the ball seat 1.

[0031] However, the solution in CN216915306U also uses a component similar to extension 8 to directly connect the spring and support the ball. In other words, this solution combines the design of two balls and extension 8. This has several advantages: First, it reduces processing difficulty. During manufacturing, there's no need to precisely control the axial thickness between the main ball 5 and the secondary ball 6, simplifying the process, reducing scrap rates due to excessively high dimensional accuracy requirements, and improving the yield. Second, this structure ensures that the spring 7 maintains a relatively stable linear motion during writing, preventing skewing or jamming. This helps the spring 7 consistently provide a uniform and stable support force to the secondary ball 6, thus ensuring the stability and uniformity of ink flow during writing. Simultaneously, the design of extension 8 originating from the second channel 4 provides a certain amount of flexibility for the extension and retraction of the spring 7, reducing frictional resistance between the spring 7 and the inner wall of the second channel 4, making the extension and retraction of the spring 7 smoother, extending its lifespan, and reducing energy loss that may result from excessive friction.

[0032] However, the problem with the above design is that although the design of double beads plus extension 8 has a significant advantage over the prior art, if it is just a combination of two existing technical solutions, how can the novelty and creativity that this solution should have be reflected? Furthermore, we can see that a number of recesses 9 formed by dot-matrix stamping are evenly distributed around the outer surface of the ball seat 1. At the same time as these recesses 9 are formed, a protruding support portion 10 is formed inside the ball seat 1. Figure 3 The shaded area in the diagram represents the main body of the support portion 10. In this embodiment, four recesses 9 are evenly distributed, and four support portions 10 are correspondingly formed. The depth of the recesses 9 and the height of the support portions 10 can be adjusted appropriately according to different design requirements. The height of the support portions 10 ranges from 0.6±0.03mm to 0.8±0.02mm, and in this embodiment, it is 0.7mm. The length of the corresponding recesses 9 is also as close as possible to the height of the support portions 10, which is 0.69mm in this embodiment. The depth of the recesses is 0.1mm, and the distance from the recesses 9 to the inner wall of the ball seat portion 1 ranges from 0.26±0.02mm to 0.32±0.02mm. Within the above-mentioned dimensional requirements, the support portion 10 can perfectly support the main ball 5. Furthermore, it should be noted that in this solution, the front end of the support portion 10 forms a bowl-shaped opening to support the main ball 5, while the rear end connects to the front end of the first channel 3.

[0033] To understand the advantages of the above design, we can refer to the prior art document CN217532348U in the background section for comparison.

[0034] In the solution CN217532348U, protrusions are formed inside the ball seat body by dotting, and a secondary processing is performed to form a bowl base. Small holes and oil grooves are formed between the bowl bases, and the bowl base supports the ball ball at multiple points during writing. The ball seat body here is the ball seat part 1 in this solution, and the protrusions are the support parts 10. Therefore, it may seem superficially that forming the pits 9 and support parts 10 by dotting is already prior art. However, when considering the whole solution, it becomes clear that for those skilled in the art, this prior art solution cannot be simply applied directly to the structure designed in the above-mentioned solution.

[0035] Specifically, in the CN217532348U design, a single ball bearing is used. The ball bearing is supported by a bowl-shaped base formed by the dotted indentations. Given this design, and considering the question raised in the background section—that is, when the pen tip falls straight down, can the ball bearing be prevented from impacting the base?—the accompanying diagram in the manual shows that the bowl-shaped base, or support structure, is simply the small, spherical section formed by the dotted indentations. Behind this spherical section, there are no other structures that can provide direct support in a straight line. Therefore, this structure is far from providing sufficient support strength, significantly reducing its drop-proof performance.

[0036] In this design, as mentioned earlier, the ball seat 1 refers not only to the small section supporting the ball, but also to the entire section in front of the channel, designed to support the main ball 5. First, the supporting section 10 in this design is not naturally formed, but rather created by punching the recess 9. Therefore, it inherently possesses high support performance after formation. Second, after the supporting section 10 is formed, its front end forms a bowl shape to support the main ball 5, while its rear end connects to the front end of the first channel 3. In other words, during the punching process, the upper and lower ends of the recess 9 connect with the bowl shape and the front end of the first channel 3, respectively. Therefore, in this design, the length of the recess 9 is designed to be longer than that described in CN217532348U. Thirdly, as described in prior art CN217574649U, a built-in support structure can be roughly considered to be designed between the outer and inner balls. However, it is clear that this structure is not formed by dotting, but is naturally designed, therefore its strength is insufficient. Only by compressing and pushing the structure through dotting can its strength be guaranteed. Secondly, since this support structure is stuck between the outer and inner balls, the length that can support the outer ball is far from enough, and thus it also cannot achieve the support and drop protection effect that this solution can achieve.

[0037] In addition to the support structure described above, a constricted section 11 with an inward inclination is provided around the front end of the ball seat 1. The front face of the constricted section 11 is horizontal. The angle between the outer edge of the constricted section and its front face is defined as ∠α1, and the angle between the inner edge of the constricted section and its front face is defined as ∠β1, where ∠α1 < ∠β1. The angle between the tangent formed by the outer edge of the constricted section to the main ball and its front face is defined as ∠α2, and the angle between the tangent formed by the inner edge of the constricted section to the main ball and its front face is defined as ∠β2, where ∠α1 > ∠α2 and ∠β1 > ∠β2. Therefore, this design also protects the main ball 5 from the outside by using the constricted section 11, preventing ink leakage and enhancing its drop resistance. Furthermore, the design at various angles further satisfies the requirement for smooth writing. The test report shows that the drop test results of the anti-drop pen tip designed using this solution can withstand 50 vertical drops from a height of one meter without affecting writing, and the ink flow remains normal.

[0038] In summary, the structural design adopted in this solution is based on a comprehensive consideration of the advantages and disadvantages of existing technologies. First, the design of double beads and extension 8 improves the smoothness of writing and the uniformity and stability of ink output, and also prevents the beads from being easily damaged. On this basis, a ball seat 1 that is connected to the front end of the first channel 3, as well as a recess 9 and a support part 10 formed by dotting and stamping, are further designed to improve the impact resistance. The position of the recess 9 is such that its front end is located in front of the front end of the secondary ball 6, and its rear end is located behind the rear end of the secondary ball 6. Unlike the existing technology that can only support the main ball 5 (outer ball), this solution utilizes the vertical direction of the entire ball seat 1 for support, which greatly improves the support strength. Therefore, for those skilled in the art, the pen tip structure designed in this solution cannot be obtained simply by relying on existing technologies alone or even by combining them.

[0039] Furthermore, in this design, both the main ball 5 and the secondary ball 6 are made of tungsten carbide, while the main ball seat 1 is made of zirconium-nickel alloy, which makes the overall structure harder, less prone to deformation, and more resilient.

[0040] The anti-drop pen refill of this utility model includes the aforementioned anti-drop pen tip, and also includes a pen refill tube. The anti-drop pen tip is installed at the front end of the pen refill tube via a connector 12. The internal cavity of the pen refill tube contains ink, and the internal cavity of the pen refill tube is connected to the second channel 4.

[0041] In this embodiment, the connector 12 has a stepped structure with internal steps. This design further prevents the pen tip from being pushed into the pen refill tube when the pen refill falls straight down with the pen tip pointing downwards. In this embodiment, the connector 12 includes a front stepped portion 121 at the front end and a rear stepped portion 122 at the rear end. The inner diameter of the front stepped portion 121 is 2.4 mm, and the inner diameter of the rear stepped portion 122 is 1.9 mm. At the junction of the front stepped portion 121 and the rear stepped portion 122, a support portion 123 is provided around the outside of the connector 12. The outer diameter of the support portion 123 is 5.45 ± 0.05 mm. In front of the support portion 123, i.e., the front stepped portion 121, the maximum outer diameter is 4.18 ± 0.02 mm. Behind the support portion 123, i.e., the rear stepped portion 122, the outer diameter is 3.44 mm. It can be seen that the structural design of connector 12 takes into account both the outer and inner sides how to prevent the entire anti-drop pen tip from being pushed into the pen refill tube, thereby further enhancing the overall anti-drop performance.

[0042] The anti-drop pen described in this utility model adopts the aforementioned anti-drop pen tip and anti-drop pen core structure.

Claims

1. A drop-resistant pen tip, comprising a ball seat portion and a channel portion connected together, characterized in that, The channel portion includes a first channel and a second channel. The front end of the first channel is connected to the rear end of the ball seat portion, and the outer diameter of the front end of the first channel is the same as the outer diameter of the rear end of the ball seat portion. The outer diameter of the first channel gradually increases from the front end to the rear end. The front end of the second channel is connected to the rear end of the first channel. The front end of the ball seat supports the main ball, and a secondary ball is located directly behind the main ball inside the ball seat. A spring is provided in the second channel, and the front end of the spring has a straight extension. The extension passes through the first channel to reach the interior of the ball seat and abuts against the secondary ball. A plurality of recesses formed by dot stamping are evenly distributed around the outer surface of the ball seat, and a protruding support portion is formed inside the ball seat. The front end of the support portion forms a bowl-shaped opening to support the main ball, and the rear end of the support portion is connected to the front end of the first channel.

2. The anti-dropping pen head according to claim 1, wherein The front end of the ball seat has an inwardly inclined tapering section.

3. The anti-dropping pen head according to claim 2, wherein, The front end face of the constricted portion is horizontal; The angle between the outer side of the constricted portion and the front end face of the constricted portion is defined as ∠α1; The angle between the inner side of the constricted portion and the front end face of the constricted portion is defined as ∠β1; The ∠α1 < ∠β1.

4. The drop-resistant pen tip according to claim 3, characterized in that, Define the angle between the tangent formed by the outer edge of the constricted portion and the main ball and the front end face of the constricted portion as ∠α2; Define the angle between the tangent formed by the inner side of the constricted portion and the main ball and the front end face of the constricted portion as ∠β2; ∠α1>∠α2, ∠β1>∠β2.

5. The impact-resistant writing point of claim 1, wherein The pit is shaped like a frustum.

6. The impact-resistant writing point of claim 1, wherein The front end of the recess is located in front of the front end of the sub-ball, and the rear end of the recess is located behind the rear end of the sub-ball.

7. The impact-resistant writing instrument tip of claim 1, wherein Both the main ball and the secondary ball are made of tungsten carbide, and the ball seat is made of zirconium-nickel alloy.

8. A shatterproof refill, characterized in that The pen tip includes the anti-drop pen tip according to any one of claims 1-7, and also includes a pen refill tube, wherein the internal cavity of the pen refill tube contains ink, and the internal cavity of the pen refill tube is connected to the second channel.

9. The shatterproof refill according to claim 8, characterized in that The drop-proof pen tip is installed at the front end of the pen refill tube via a connector, which is stepped.

10. A shockproof pen, characterized by comprising: Includes the drop-resistant pen refill as described in claim 9.

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