Direct liquid type ink pen
By using the annular stepped surface limiting mechanism of the ink core and the protective component design of the water reservoir, the problems of ink core displacement and ball collision are solved, achieving stable ink delivery and continuous writing in the fountain pen, and improving the reliability and aesthetics of the product.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WENZHOU TIANJIAO PEN IND
- Filing Date
- 2025-04-24
- Publication Date
- 2026-04-17
AI Technical Summary
When a direct-liquid ink pen is dropped or impacted, the ink core is prone to displacement, resulting in poor ink delivery. Furthermore, the ballpoint pen may damage the rear end of the ink core upon impact, affecting the writing performance.
The water inlet core is connected by a ring-shaped stepped surface limiting mechanism at the front and rear sections, combined with the protective components and multi-layer nested structure of the water tank. This ensures a stable connection of the water inlet core and protects the rear end of the water inlet core from ball collisions.
This improves the assembly reliability and connection stability of the ink core, prevents ink delivery interruptions, ensures writing continuity, and enhances the product's aesthetics and structural strength.
Smart Images
Figure 1
Abstract
Description
Technical Field
[0001] This utility model relates to writing instruments, specifically to a direct-liquid ink pen. Background Technology
[0002] Direct-flow fountain pens typically include components such as a nib, nib holder, ink cartridge, reservoir, ink core, and ballpoint. The nib holder is mounted on the front of the ink cartridge, the nib is mounted on the nib holder, the reservoir is housed inside the ink cartridge, and the ink core is mounted on the reservoir. The front end of the ink core contacts the rear end of the nib for ink delivery, and the rear end of the ink core is inserted into the ink chamber of the ink cartridge. The ballpoint is rolled within the ink chamber. The ink core is usually fixed in the reservoir using a tight fit. When the pen is dropped or impacted, the ink core can easily shift, affecting the contact between the ink core and the nib, leading to poor ink delivery and frequent ink interruptions during writing. Furthermore, since both the ballpoint and the rear end of the ink core are located within the ink chamber, the ballpoint can collide with the rear end of the ink core when the pen is shaken, potentially damaging the rear end of the ink core, which also affects ink delivery. Utility Model Content
[0003] In order to overcome the defects of the prior art, this utility model provides a direct-liquid ink pen with a simple and reliable ink core assembly structure, and the ink core is not easy to shift.
[0004] This utility model discloses a direct-liquid fountain pen, comprising a pen tip, a pen tip holder, an ink cartridge, a water reservoir, and an ink guide. The pen tip is inserted and fixed to the pen tip holder. The ink cartridge includes an inner cavity, and the pen tip holder is inserted and fixed to the front end of the ink cartridge. An ink chamber is formed at the rear of the inner cavity of the ink cartridge. The water reservoir includes a central hole extending through its front and rear ends. The ink guide is inserted and fixed at the central hole of the water reservoir. The front end of the ink guide is connected to the rear end of the pen tip for ink delivery, and the rear end of the ink guide passes through the ink chamber. The central hole of the water reservoir includes a front section and a rear section. The diameter of the front section of the central hole is larger than that of the rear section. The front and rear sections of the central hole... The first annular stepped surface is formed at the connection point. The water-guiding core includes a front section and a rear section. The outer diameter of the front section of the water-guiding core is larger than that of the rear section. The second annular stepped surface is formed at the connection point of the front and rear sections of the water-guiding core. The front section of the water-guiding core is inserted into the front section of the central hole, and the rear section of the water-guiding core is inserted into the rear section of the central hole. The first and second annular stepped surfaces abut and limit each other. The front section of the central hole has a uniform aperture, and the rear section of the water-guiding core has a uniform outer diameter. The aperture of the rear section of the central hole gradually decreases from front to back. The aperture at the rear end of the rear section of the central hole is smaller than the outer diameter of the rear section of the water-guiding core.
[0005] During assembly, the water-guiding core is inserted from the front end of the central hole of the water reservoir backward. When it is fully inserted, the second annular stepped surface of the water-guiding core abuts against the first annular stepped surface of the water reservoir, preventing further insertion of the water-guiding core. The rear section of the water-guiding core is tightly fitted into the rear section of the central hole, forming a positioning and preventing the water-guiding core from moving forward. Furthermore, the water-guiding core usually expands to a certain extent when absorbing ink, which further improves the connection between it and the water reservoir, making it difficult for the water-guiding core and the water reservoir to move. The structure is simple and easy to assemble.
[0006] Furthermore, the ink chamber contains a ball, and the rear end of the water reservoir has a U-shaped protective component. This protective component includes two connecting parts at the front and a blocking part connecting the two connecting parts. The two connecting parts are connected to the rear end of the water reservoir and located on both sides of the rear opening of the central hole. The blocking part of the protective component is spaced apart behind the rear opening of the central hole and also behind the rear end of the water inlet core. This protective component protects the rear end of the water inlet core, preventing the ball from colliding and damaging it, thus ensuring product reliability. This protective structure also has an aesthetically pleasing appearance.
[0007] Furthermore, the blocking part of the protective component has a ring-shaped structure, and a through hole is provided at the center position corresponding to the center hole of the water reservoir. The blocking part has radially outward protrusions on both sides perpendicular to the distribution direction of the two connecting parts, which can reduce the gap between the blocking part and the inner wall of the ink cavity and prevent the ball from entering.
[0008] Furthermore, the front center of the water reservoir has a forward-extending cylindrical first insertion part, the inner hole of the first insertion part is connected to the central hole of the water reservoir, the pen tip holder includes an insertion hole for insertion and positioning with the pen tip, the rear end of the pen tip holder has a rearward-extending cylindrical second insertion part, the second insertion part is connected to the insertion hole of the pen tip holder, the second insertion part is inserted into the inner side of the ink cartridge, the first insertion part is inserted into the inner side of the second insertion part, the rear end of the pen tip is inserted into the inner side of the first insertion part, and the front end of the water inlet core passes through the inner side of the first insertion part and is connected to the rear end of the pen tip.
[0009] The three-layer nested structure of the first connector, the second connector, and the ink cartridge can improve the connection between the water reservoir, the ink cartridge, and the pen tip holder, making it less likely for the three components to detach from each other, and also improving the structural strength of the connection.
[0010] Furthermore, the inner circumferential wall of the pen tip holder's insertion hole is provided with a plurality of axially extending first protrusions evenly distributed in the circumferential direction, and the plurality of first protrusions are provided with protrusions at corresponding positions along the axial direction. The pen tip includes an annular groove that engages with the protrusions of the plurality of first protrusions for positioning. When the pen tip is inserted into the insertion hole of the pen tip holder, it is positioned axially by engaging with the annular groove and the protrusions. The outer circumferential wall of the first insertion part is provided with a plurality of second protrusions evenly distributed in the circumferential direction. The gaps between adjacent first protrusions and between second protrusions can be used to achieve air pressure balance between the inside and outside of the ink cartridge, ensuring ink delivery effect.
[0011] Furthermore, the water-guiding core has a tapered front and rear end, which facilitates the guiding and insertion of the water-guiding core relative to the water reservoir, and can also increase the contact area between the rear end of the water-guiding core and the ink, as well as the contact area between the front end of the water-guiding core and the pen tip, thereby improving the ink delivery effect.
[0012] Furthermore, the protective component is integrally formed at the rear end of the water storage device, which has a simple structure and is convenient for integral processing.
[0013] The beneficial effects of this utility model are: the assembly structure of the ink core and the water reservoir of this utility model direct liquid ink pen is simple, the assembly operation is convenient, the assembly connection effect is relatively reliable, and the ink core is not easy to move when the pen is dropped or collided, thus ensuring the ink delivery effect. Attached Figure Description
[0014] Figure 1 This is an exploded view of the structure of an embodiment of the present utility model;
[0015] Figure 2 This is a partial cross-sectional view of an embodiment of the present utility model;
[0016] Figure 3 This is a structural diagram of the pen tip holder according to an embodiment of the present utility model;
[0017] Figure 4 This is a structural diagram of the pen tip according to an embodiment of the present utility model;
[0018] Figure 5 This is a structural diagram of the water storage device according to an embodiment of the present utility model;
[0019] Figure 6 This is a structural diagram of the water-guiding core according to an embodiment of the present invention;
[0020] Figure 7 This is a cross-sectional view of the water storage device according to an embodiment of the present utility model;
[0021] Figure 8 This is a structural diagram of a water storage device according to another embodiment of the present invention;
[0022] Figure 9 This is a cross-sectional view of a water storage device according to another embodiment of the present invention. Detailed Implementation
[0023] The structure of the direct-liquid ink pen in this embodiment of the utility model is as follows: Figure 1-7 As shown, it includes a pen tip 1, a pen tip holder 2, an ink cartridge 3, a water reservoir 4, and an ink inlet 5. The pen tip 1 is inserted and fixed on the pen tip holder 2. The ink cartridge 3 includes an inner cavity 30, the rear end of which is closed. The pen tip holder 2 is inserted and fixed on the front end of the ink cartridge 3. An ink chamber (i.e., an ink cavity) is formed at the rear of the inner cavity 30 of the ink cartridge 3. Figure 2 The water reservoir 4 is located in the chamber behind the water reservoir 4. The water reservoir 4 includes a central hole that runs through its front and rear ends. The water guide core 5 is inserted and fixed in the central hole of the water reservoir 4. The front end of the water guide core 5 is connected and cooperates with the rear end of the pen tip 1 for ink supply. Specifically, the front end of the water guide core 5 and the rear end of the pen tip 1 are in contact with the ink guide core 1. The rear end of the water guide core 5 is inserted into the ink chamber.
[0024] Each as Figure 2 , 6 As shown in Figure 7, the central hole of the water reservoir 4 includes a front section 41 and a rear section 42. The diameter of the front section 41 of the central hole is larger than that of the rear section 42. A first annular stepped surface 43 is formed at the connection between the front section 41 and the rear section 42 of the central hole. The water-guiding core 5 includes a front section 51 and a rear section 52. The outer diameter of the front section 51 of the water-guiding core 5 is larger than that of the rear section 52. A second annular stepped surface 53 is formed at the connection between the front section 51 and the rear section 52 of the water-guiding core 5. The front section of the water-guiding core 5 is inserted into the front section 41 of the central hole, and the rear section 52 of the water-guiding core 5 is inserted into the rear section 42 of the central hole. The first annular stepped surface 43 and the second annular stepped surface 53 are also present. 3. Abutment and limiting fit; the front section 41 of the central hole has a uniform diameter, and the rear section 52 of the water-guiding core 5 has a uniform outer diameter. The diameter of the rear section 42 of the central hole gradually decreases from front to back. That is, the rear section 42 of the central hole can be a conical hole with a uniformly varying diameter, or the rear section 42 can be a multi-segment hole with a stepped diameter. The diameter at the rear end of the rear section 42 of the central hole is smaller than the outer diameter of the rear section 52 of the water-guiding core 5, and the diameter at the front end of the rear section 42 of the central hole is greater than or equal to the outer diameter of the rear section 52 of the water-guiding core 5, so as to achieve an interference fit with the rear section 52 of the water-guiding core 5.
[0025] During assembly, the water-guiding core 5 is inserted from the front end of the central hole of the water reservoir 4 backwards. When it is inserted into place, the second annular step surface 53 of the water-guiding core 5 and the first annular step surface 43 of the water reservoir 4 abut against each other, preventing the water-guiding core 5 from being inserted further. The rear section 52 of the water-guiding core 5 is tightly inserted into the rear section 42 of the central hole, forming a positioning and preventing the water-guiding core 5 from moving forward. Furthermore, the water-guiding core 5 usually expands to a certain extent when absorbing ink. After expansion, it will further improve the connection effect with the water reservoir 4, fill the gap between the two, and make it difficult for the water-guiding core 5 and the water reservoir 4 to move. The structure is simple and easy to assemble.
[0026] like Figure 2 , 5 As shown, a ball 6 is disposed in the ink chamber. The rear end of the water reservoir 4 has a U-shaped protective component 44. The protective component 44 includes two connecting parts 441 located at the front and a blocking part 442 connected between the two connecting parts 441. The two connecting parts 441 are connected to the rear end of the water reservoir 4 and located on both sides of the rear end opening of the central hole. The blocking part 442 of the protective component 44 is spaced apart and located behind the rear end opening of the central hole, and also behind the rear end of the water inlet core 5. The protective component 44 can protect the rear end of the water inlet core 5, preventing the ball 6 from colliding and damaging the water inlet core 5, thus ensuring the reliability of the product. Furthermore, this protective structure has a relatively aesthetically pleasing appearance. To ensure the protective effect and prevent the ball 6 from contacting the rear end of the water inlet core 5, and to prevent the ball 6 from getting stuck between the protective component 44 and the side wall of the ink chamber, the gap width between the blocking part 442 and the inner wall of the ink chamber is smaller than the diameter of the ball 6.
[0027] In this embodiment, the protective component 44 is integrally formed at the rear end of the water reservoir 4, resulting in a simple structure. In other embodiments, a plug-in connection can also be used for fixed connection.
[0028] In this embodiment, as Figure 2 , 5 As shown in Figure 7, the front center of the water reservoir 4 has a forward-extending cylindrical first insertion part 45, the inner hole of the first insertion part 45 is connected to the central hole of the water reservoir 4, the pen tip holder 2 includes an insertion hole 21 that is inserted and positioned to cooperate with the pen tip 1, the rear end of the pen tip holder 2 has a rearward-extending cylindrical second insertion part 22, the second insertion part 22 is connected to the insertion hole 21 of the pen tip holder 2, the second insertion part 22 is inserted into the inner side of the front end of the ink cartridge 3, the first insertion part 45 is inserted into the inner side of the second insertion part 22, the rear end of the pen tip 1 is inserted into the inner side of the first insertion part 45, and the front end of the water inlet core 5 passes through the inner side of the first insertion part 45 and is connected to the rear end of the pen tip 1.
[0029] The three-layer nested structure of the first connector 45, the second connector 22, and the ink cartridge 3 can improve the connection effect between the water reservoir 4, the ink cartridge 3, and the pen tip holder 2, making it less likely for the three parts to detach from each other, and also improving the structural strength of the connection.
[0030] The inner circumferential wall of the insertion hole 21 of the pen tip holder 2 is provided with a plurality of axially extending first protrusions 23 evenly distributed in the circumferential direction. The protrusions 231 are provided at corresponding positions along the axial direction of the plurality of first protrusions 23. The pen tip 1 includes an annular groove 11 that is fitted and positioned in conjunction with the protrusions 231 of the plurality of first protrusions 23. When the pen tip 1 is inserted into the insertion hole of the pen tip holder 2, it is positioned axially by the cooperation of its annular groove 11 and the protrusions 231. The outer circumferential wall of the first insertion part 45 is provided with a plurality of second protrusions 451 evenly distributed in the circumferential direction. The gaps between adjacent first protrusions 23 and between second protrusions 451 can be used to achieve air pressure balance between the inside and outside of the ink cartridge 3 to ensure ink delivery effect.
[0031] The water-guiding core 5 has a tapered front and rear end, which facilitates the guiding and insertion of the water-guiding core 5 relative to the water reservoir 4. It can also increase the contact area between the rear end of the water-guiding core 5 and the ink, as well as the contact area between the front end of the water-guiding core 5 and the pen tip 1, thereby improving the ink delivery effect.
[0032] The difference between the water storage device 4 of another embodiment of this utility model and the water storage device 4 of the above embodiment is only the construction of the rear protective component 44 is different. Specifically, as shown in the figure... Figure 8 , 9 As shown, the blocking part 442 of the protective component 44 has an annular structure. The blocking part 442 has a through hole 4421 at the center position corresponding to the center hole of the water reservoir 4. The through hole 4421 can improve the flow effect of ink. The blocking part 442 has radially outward protrusions 4422 on both sides perpendicular to the distribution direction of the two connecting parts 441. This can reduce the gap between the blocking part 442 and the inner wall of the ink cavity and prevent the ball from entering between the blocking part 442 and the inner wall of the ink cavity.
[0033] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.
Claims
1. A direct-liquid fountain pen, comprising a pen tip, a pen tip holder, an ink cartridge, a reservoir, and an ink inlet wick, wherein the pen tip is inserted and fixed to the pen tip holder, the ink cartridge includes an inner cavity, the pen tip holder is inserted and fixed to the front end of the ink cartridge, an ink chamber is formed at the rear of the inner cavity of the ink cartridge, the reservoir includes a central hole extending through its front and rear ends, the ink inlet wick is inserted and fixed to the central hole of the reservoir, the front end of the ink inlet wick is connected and engaged with the rear end of the pen tip for ink delivery, and the rear end of the ink inlet wick passes through the ink chamber, characterized in that: The central hole of the water reservoir includes a front section and a rear section. The diameter of the front section of the central hole is larger than that of the rear section. A first annular stepped surface is formed at the connection between the front and rear sections of the central hole. The water-conducting core includes a front section and a rear section. The outer diameter of the front section of the water-conducting core is larger than that of the rear section. A second annular stepped surface is formed at the connection between the front and rear sections of the water-conducting core. The front section of the water-conducting core is inserted into the front section of the central hole, and the rear section of the water-conducting core is inserted into the rear section of the central hole. The first and second annular stepped surfaces abut and limit each other. The front section of the central hole has a uniform diameter, and the rear section of the water-conducting core has a uniform outer diameter. The diameter of the rear section of the central hole gradually decreases from front to back. The diameter at the rear end of the rear section of the central hole is smaller than the outer diameter of the rear section of the water-conducting core.
2. The liquid direct ink pen according to claim 1, characterized by: The ink chamber is provided with a ball, and the rear end of the water reservoir has a U-shaped protective component. The protective component includes two connecting parts located at the front and a blocking part connected between the two connecting parts. The two connecting parts are connected to the rear end of the water reservoir and located on both sides of the rear end opening of the central hole. The blocking part of the protective component is arranged at intervals behind the rear end opening of the central hole and simultaneously behind the rear end of the water inlet core.
3. The liquid direct ink pen according to claim 2, characterized by: The blocking part of the protective component has a ring-shaped structure. The blocking part has a through hole at the center position corresponding to the center hole of the water tank. The blocking part has radially outward protrusions on both sides perpendicular to the distribution direction of the two connecting parts.
4. The liquid direct ink pen of claim 1, wherein: The front center of the water reservoir has a forward-extending cylindrical first insertion part, the inner hole of the first insertion part is connected to the central hole of the water reservoir, the pen tip holder includes an insertion hole for insertion and positioning with the pen tip, the rear end of the pen tip holder has a rearward-extending cylindrical second insertion part, the second insertion part is connected to the insertion hole of the pen tip holder, the second insertion part is inserted into the inner side of the ink cartridge, the first insertion part is inserted into the inner side of the second insertion part, the rear end of the pen tip is inserted into the inner side of the first insertion part, and the front end of the water inlet core passes through the inner side of the first insertion part and is connected to the rear end of the pen tip.
5. The liquid direct ink pen of claim 4, wherein: The inner circumferential wall of the pen tip holder is provided with a plurality of axially extending first protrusions evenly distributed in the circumferential direction, and the corresponding positions of the plurality of first protrusions along the axial direction are provided with protrusions. The pen tip includes an annular groove that is fitted and positioned in conjunction with the protrusions of the plurality of first protrusions. The outer circumferential wall of the first insertion part is provided with a plurality of second protrusions evenly distributed in the circumferential direction.
6. The liquid direct ink pen of claim 1, wherein: The water intake core has a conical front and rear end.
7. The liquid direct ink pen of claim 2, wherein: The protective component is integrally formed at the rear end of the water storage device.