Ballpoint pen capable of preventing ink leakage
By introducing a bonding mechanism into the ballpoint pen, and utilizing the design of clamps and magnets, the problem of ink leakage from the pen tip is solved, the pen tip is sealed, the risk of ink leakage is reduced, and the ease of use and cleaning efficiency are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-27
- Publication Date
- 2026-03-31
AI Technical Summary
Existing ballpoint pens are prone to ink leakage during use, leading to contamination of the pen holder and external parts, especially when the pen cap is not in use, as the ink flows directly to the outside, causing contamination of pencil cases and school bags.
A leak-proof ballpoint pen was designed, employing a bonding mechanism including symmetrical clamps and elastic sheets. The clamps circumferentially bond with the pen tip, and magnets and rubber layers enhance the sealing effect, ensuring that the pen tip fits snugly inside the pen barrel when retracted.
It effectively prevents ink leakage, reduces the risk of contamination to the pen holder and external environment, facilitates pen refill replacement and continued use, and improves ease of use and cleaning efficiency.
Smart Images
Figure CN224060731U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ballpoint pens, specifically to a leak-proof ballpoint pen. Background Technology
[0002] Ballpoint pens are widely used as everyday writing tools due to their convenience and affordability. However, existing replaceable refill ballpoint pens suffer from ink leakage at the tip, which contaminates the pen holder and prevents continued use after refill replacement. Furthermore, many existing ballpoint pens use a push-button design and typically lack a cap. Therefore, when ink leaks, it not only contaminates the inside of the pen holder but also flows directly to the outside through a vent at the tip, soiling pencil cases, bags, and other items, causing inconvenience to users. Utility Model Content
[0003] The purpose of this utility model is to provide a leak-proof ballpoint pen. This ballpoint pen seals the pen tip through a bonding mechanism, so that when the pen tip leaks ink, the bonding mechanism can lock the ink inside the bonding mechanism, reducing the risk of ink leakage causing contamination of the pen holder or even leaking to the outside and contaminating the pencil case and school bag.
[0004] The technical solution adopted by this utility model to solve the above problems is:
[0005] A leak-proof ballpoint pen includes a pen holder, a pen refill, and a bonding mechanism. The pen refill is slidably disposed inside the pen holder via a telescopic locking mechanism. The bonding mechanism is disposed inside the pen holder and located at the tip of the pen refill. When the pen tip retracts into the pen holder, the bonding mechanism is circumferentially bonded to the pen tip.
[0006] In the above technical solution, preferably, the bonding mechanism includes two clamping members that are symmetrical about the vertical axis of the pen tip. The upper end of the clamping member is hinged inside the pen barrel. The inner sides of the two clamping members are adapted to cover and bond with the surface of the pen tip. The outer side of the clamping member is provided with an elastic sheet that drives the clamping member to rotate inward.
[0007] In the above technical solution, preferably, the inner side of the clamping member is provided with a rubber layer.
[0008] In the above technical solution, preferably, the bottom ends of the two clamping members are respectively provided with semi-cylindrical magnets that attract each other.
[0009] In the above technical solution, preferably, an annular fixing ring is provided inside the pen holder on the upper side of the bonding mechanism, and an annular rubber ring is provided inside the fixing ring, with the rubber ring bonding to the surface of the pen tip.
[0010] In the above technical solution, preferably, the pen holder includes a cylindrical part and a pointed part, the pointed part is detachably fixed to the lower end of the cylindrical part by a threaded structure, and the fitting mechanism and the rubber ring are located inside the pointed part.
[0011] Compared with the prior art, this utility model has the following advantages and effects:
[0012] This invention uses a bonding mechanism to circumferentially bond with the pen tip, so that when the ballpoint pen is not in use, the bonding mechanism can seal the pen tip. In the event of ink leakage, the bonding mechanism can lock the ink inside, reducing the risk of ink leakage contaminating the pen holder or even the pencil case and school bag. It also makes it easier to replace the pen refill and continue using the pen holder. Attached Figure Description
[0013] Figure 1 This is a front structural cross-sectional view of the ink-leakage-proof ballpoint pen according to an embodiment of this utility model.
[0014] Figure 2 yes Figure 1 Enlarged view of the bonding mechanism.
[0015] Figure 3 yes Figure 2 A diagram showing the state of the fitting mechanism when the pen tip retracts into the pen holder.
[0016] The components include: pen holder 1, fixing ring 11, rubber ring 12, cylindrical part 13, tip passage 14, pen refill 2, pen tip 21, bonding mechanism 3, clamping part 31, elastic sheet 32, rubber layer 33, and magnet 34. Detailed Implementation
[0017] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.
[0018] See Figures 1-3 This embodiment provides a leak-proof ballpoint pen, including a pen holder 1, a pen refill 2, and a bonding mechanism 3. The pen refill 2 is slidably disposed inside the pen holder 1 via a telescopic locking mechanism. The bonding mechanism 3 is disposed inside the pen holder 1 and is located at the pen tip 21 of the pen refill 2. When the pen tip 21 is retracted into the pen holder 1, the bonding mechanism 3 is circumferentially bonded to the pen tip 21.
[0019] In this invention, the telescopic locking mechanism adopts a conventional telescopic locking mechanism in the field.
[0020] This utility model uses a bonding mechanism 3 to circumferentially bond with the pen tip 21, so that when the ballpoint pen is not in use, the bonding mechanism 3 can seal the pen tip 21. Thus, when the pen tip 21 leaks ink, the bonding mechanism 3 can lock the ink inside the bonding mechanism 3, reducing the risk of ink leakage causing contamination of the pen holder 1 or even leaking to the outside and contaminating the pencil case and school bag. It also makes it easier for the pen holder 1 to be used again after the pen refill 2 is replaced.
[0021] See Figure 2 , Figure 3 The fitting mechanism 3 includes two clamping members 31 that are symmetrical about the vertical axis of the pen tip 21. The upper end of the clamping member 31 is hinged inside the pen holder 1. The inner sides of the two clamping members 31 are adapted to cover and fit the surface of the pen tip 21. The outer side of the clamping member 31 is provided with an elastic sheet 32 that drives the clamping member 31 to rotate inward.
[0022] When the pen refill 2 moves downward and extends out of the pen holder 1 through the telescopic locking mechanism, the pen tip 21 moves downward and pushes open the two clamping members 31. The two clamping members 31 rotate and separate, the elastic sheet 32 is compressed, and the pen tip 21 passes through the two clamping members 31 and finally extends out of the pen holder 1 for writing. When the pen refill 2 moves upward and retracts into the pen holder 1 through the telescopic locking mechanism, the pen tip 21 moves upward and moves away from the two clamping members 31. The clamping members 31 rotate and reset under the action of the elastic sheet 32 and fit against the surface of the pen refill 2. Thus, the sealing of the two clamping members 31 reduces the risk of ink leakage. Moreover, the clamping members 31 can automatically fit without additional manual operation, improving the convenience of using this utility model.
[0023] See Figure 2 , Figure 3 The inner side of the clamping member 31 is provided with a rubber layer 33.
[0024] The rubber layer 33 has a certain elasticity. When the clamping member 31 is pressed against the surface of the pen tip 21 under the action of the elastic sheet 32, the rubber layer 33 can deform to improve the adhesion to the surface of the pen tip 21, thereby improving the adhesion and sealing effect of the pen tip 21 and further reducing the risk of ink leakage.
[0025] See Figure 2 , Figure 3 The bottom ends of the two clamping members 31 are respectively provided with semi-cylindrical magnets 34 that attract each other.
[0026] When the two clamping members 31 contact each other to clamp and seal the pen tip 21, the two magnets 34 can attract each other, improving the clamping effect of the two clamping blocks on the pen tip 21. This reduces the risk of ink leakage due to gaps between the two clamping members 31 caused by the up-and-down movement of the pen refill 2, thus improving the ink leakage prevention performance of this invention. Furthermore, if the pen tip 21 is made of stainless steel, the magnetic attraction between the magnets 34 and the pen tip 21 can drive the clamping members 31 to automatically adhere to the pen tip 21. In this case, the elastic sheet 32 can be omitted, reducing the structural complexity of the bonding mechanism 3 and thus reducing production costs.
[0027] See Figure 2 , Figure 3 The upper part of the fitting mechanism 3 has an annular fixing ring 11 inside the pen holder 1, and an annular rubber ring 12 inside the fixing ring 11. The rubber ring 12 is attached to the surface of the pen tip 21.
[0028] The rubber ring 12 is elastic and can always fit the pen refill 2 and the pen tip 21 when the pen refill 2 moves up and down. When the pen tip 21 leaks ink, the ink will stick to the pen tip 21. The sealing ring will hang the ink on the pen tip 21, thereby reducing the risk of ink entering the upper part of the pen holder 1.
[0029] See Figure 2 , Figure 3 The pen holder 1 includes a cylindrical part 13 and a pointed part. The pointed part is detachably fixed to the lower end of the cylindrical part 13 through a threaded structure 14. The fitting mechanism 3 and the rubber ring 12 are located inside the pointed part.
[0030] When ink leakage from the pen tip 21 causes ink to adhere to the bonding mechanism 3, the rubber ring 12, and the inside of the tip, the tip can be removed from the cylindrical part 13 for separate cleaning, thereby improving the cleaning efficiency of this ballpoint pen.
[0031] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.
Claims
1. A leakproof ink ballpoint pen, characterized by: The utility model relates to a pen barrel, a pen core and a fitting mechanism, the pen core is arranged in the pen barrel through the up and down sliding of telescopic locking mechanism, the fitting mechanism is arranged in the pen barrel and the fitting mechanism is located at the pen point of pen core, when the pen point is retracted into the pen barrel, the fitting mechanism is circumferentially fitted with the pen point.
2. A leakproof ballpoint pen according to claim 1, characterized in that: The fitting mechanism includes two clamping pieces which are left-right symmetrical with the vertical axis of the pen point as the symmetry axis, the upper end of the clamping piece is hinged in the pen barrel, the inner side of the two clamping pieces is adapted to cover and fit the surface of the pen point, and the outer side of the clamping piece is provided with an elastic sheet for driving the clamping piece to rotate inward.
3. A leakproof ballpoint pen according to claim 2, characterized in that: The inner side of the clamping piece is provided with a rubber layer.
4. The leakproof ballpoint pen of claim 2, wherein: The bottom end of the two clamping pieces is respectively provided with a semicylindrical magnet which is magnetically attracted to each other.
5. The leakproof ballpoint pen of claim 1, wherein: The pen barrel is provided with an annular fixing ring on the upper side of the fitting mechanism, the inner side of the fixing ring is provided with an annular rubber ring which is fitted with the surface of the pen point.
6. The leakproof ballpoint pen of claim 1, wherein: The pen barrel includes a cylindrical part and a pointed end part, the pointed end part is detachably fixed at the lower end of the cylindrical part through a threaded structure, and the fitting mechanism and the rubber ring are located in the pointed end part.