An integrated pen ink tank

Abstract

An integrated ink cartridge for a fountain pen includes a nib with a water guide groove on its left end face for guiding ink flow; a feed inserted into the nib for guiding ink flow; a first cylinder fixedly mounted on the top of the feed with a vertically penetrating through-hole for easy gripping; a reservoir fixedly mounted on the top of the first cylinder with a sliding connecting rod piston module for storing ink; and a cap screwed to the first cylinder with its axis collinear with the cylinder's axis. The nib, acting as the ink output terminal, features a streamlined groove design for the water guide groove, which guides ink flow directionally from the feed to the writing end of the nib through capillary action, ensuring a uniform and continuous ink supply during writing and effectively preventing ink interruptions or spills.

Description

Technical Field

[0001] This utility model relates to the field of writing instrument technology, and in particular to an integrated ink cartridge for a fountain pen. Background Technology

[0002] A fountain pen's ink supply system typically consists of a nib, feed, connecting sleeve, and ink storage unit. Current mainstream ink storage methods include disposable ink cartridges and reusable refillable cartridges, as well as vacuum and drip-type structures. Disposable ink cartridges rely on a thin film seal that is broken by a needle inside the feed for activation, while refillable cartridges use a screw or extrusion mechanism to draw ink into the cavity.

[0003] The above-mentioned existing technical solutions have the following drawbacks: Traditional converter ink storage has a multi-level sealing path formed by the converter head and threads or buckles, and assembly errors, material aging and swelling can cause micro-leakage. Disposable ink cartridges are usually a combination of multiple materials, which are difficult to classify and recycle. Utility Model Content

[0004] The purpose of this invention is to provide an integrated ink cartridge for fountain pens to solve the problems existing in the prior art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] An integrated ink cartridge for a fountain pen includes a nib with a water guide groove on its left end face for guiding ink flow; a feed inserted into the nib for guiding ink flow; a first cylinder fixedly mounted on the top of the feed, with a through hole running vertically through the cylinder, the axis of which is vertically aligned, for easy grip by the writer; a reservoir fixedly mounted on the top of the first cylinder, with a connecting rod piston module slidably mounted inside, for storing ink; and a cap screwed to the first cylinder, the axis of which is collinear with the axis of the first cylinder, the top surface of which fits against the bottom surface of the reservoir, for protecting the nib from damage.

[0007] By adopting the above technical solution, the pen tip, as the ink output terminal, adopts a streamlined groove design for the water guide channel. Through the capillary action principle, the ink is guided to flow directionally from the feed to the writing end of the pen tip, ensuring a uniform and continuous ink supply during writing and effectively avoiding ink interruption or spillage.

[0008] In a further embodiment, the top of the water reservoir is provided with an integrally formed first cylindrical protrusion, the axis of the first cylindrical protrusion is collinear with the axis of the water reservoir, the first cylindrical protrusion is provided with external threads, the top of the first cylindrical protrusion is provided with a second through hole that extends vertically, the axis of the second through hole is collinear with the axis of the first cylindrical protrusion, the second through hole communicates with the water reservoir, and a locking module is provided inside the water reservoir.

[0009] By adopting the above technical solution, the connection sealing performance can be enhanced, and the structural connection strength can be improved. The locking module can also make it easier to fix the piston and make contact connections.

[0010] In a further embodiment, the piston module includes a piston, a connecting rod, and a pen cover. The piston has a fourth through hole extending vertically through its top, with the axis of the fourth through hole being vertically aligned. The bottom end of the fourth through hole has an internal thread. A third cylinder is fixedly mounted on the top of the piston. The third cylinder has a fifth through hole extending vertically through its top, with the axis of the fifth through hole being vertically aligned and communicating with the fourth through hole. A first annular protrusion is slidably mounted on the bottom end of the third cylinder, with the axis of the first annular protrusion collinear with the axis of the third cylinder. A second annular protrusion is detachably mounted on the top end of the third cylinder, with the axis of the second annular protrusion collinear with the axis of the third cylinder. A connecting rod is inserted into the fourth through hole, with the axis of the connecting rod collinear with the axis of the fourth through hole. The bottom end of the connecting rod has an external thread. The connecting rod slides against the piston. A pen cover is fixedly mounted on the top end of the connecting rod, and the pen cover has an internal thread.

[0011] By adopting the above technical solution, the internal thread inside the pen cover can achieve a stable connection with the external thread structure, enhancing the overall assembly firmness and preventing loosening during use. At the same time, the threaded connection is detachable, facilitating the inspection, replacement, or maintenance of the pen cover's interior and related components, thus improving the product's service life and ease of use. Furthermore, the threaded engagement method also allows for fine-tuning of the pen cover's position, ensuring its fixed installation accuracy with the connecting rod tip and guaranteeing the stable operation of the piston module's overall function.

[0012] In a further embodiment, the locking module is detachably installed on the inner top of the water reservoir. The locking module includes a first rectangular block, a triangular pin, a spring, a round rod, and a second cylinder. The top of the first rectangular block has a vertically penetrating third through hole with its axis vertically aligned. The bottom of the first rectangular block has an upward-facing first rectangular groove with its axis collinear with the axis of the third through hole. The left and right ends of the first rectangular block have symmetrically arranged first circular holes with their axes aligned horizontally. One end of the inner face of the first circular hole has a first rectangular hole with its axis collinear with the axis of the first circular hole. The first rectangular hole communicates with the first circular hole. A second rectangular hole is provided at one end of the inner end face of the first rectangular hole. The axis of the second rectangular hole is collinear with the axis of the first rectangular hole. The second rectangular hole communicates with the first rectangular hole and the first rectangular groove. A spring is fixedly installed in the first rectangular hole. The axis of the spring is collinear with the axis of the first rectangular hole. A round rod is inserted into the spring. The axis of the round rod is collinear with the axis of the spring. A triangular pin is fixedly installed on the inner end face of the round rod. The top end face of the triangular pin is in contact with the inner top end face of the second rectangular hole. The bottom end face of the triangular pin is in contact with the inner bottom end face of the second rectangular hole. A second cylinder is fixedly installed on the outer end face of the round rod. The axis of the second cylinder is collinear with the axis of the round rod.

[0013] By adopting the above technical solution, the locking module uses a multi-axis collinear design, which ensures the precise coordination between components, the effective transmission of force, the smooth and stable movement, and the reliable realization of the locking function. It also facilitates the processing, manufacturing, assembly and maintenance of the structure, and significantly improves the overall performance of the locking module.

[0014] In a further embodiment, the locking module is fixedly installed at the bottom of the piston. The locking module includes a piston, a connecting rod, a second cylindrical protrusion, and a second circular hole. The bottom of the piston is provided with a mounting groove, and the second circular hole is provided within the mounting groove. The bottom end of the connecting rod is provided with an integrally formed protrusion, the bottom end of which is slidably installed within the mounting groove. The bottom end of the protrusion is provided with an integrally formed second cylindrical protrusion.

[0015] By adopting the above technical solution, the dynamic response performance of the locking module is optimized. The precise fit between the second cylindrical protrusion and the second circular hole reduces the gap and wobbling during the movement, making the linkage movement more agile and smooth, enabling it to respond quickly to locking commands, shorten locking time, and improve the overall working efficiency of the equipment. At the same time, the tight fit also reduces noise and vibration during the movement, improving the stability of the equipment's operation.

[0016] In a further embodiment, the first cylinder has symmetrical clearance grooves arranged on its circumference, and the top of the first cylinder has an external thread.

[0017] By adopting the above technical solutions: the avoidance groove makes the writing grip more ergonomic, and the threaded connection facilitates detachable fixing. The connection method is stable, reliable, and easy to install and disassemble, which is beneficial for later maintenance, repair, or component replacement. At the same time, the threaded connection can adjust the connection depth according to actual needs, has a certain adjustment function, can adapt to different assembly length requirements, and enhances the flexibility and versatility of the structural connection.

[0018] In a further embodiment, a pen lug is fixedly installed at the bottom end of the pen cap, and an internal thread is provided at the inner top end of the pen cap.

[0019] By adopting the above technical solution, when it is necessary to remove or insert the pen cap, the fingers can naturally rest on the pen lugs to apply force, effectively increasing friction and preventing slippage, making it easier and more stable to remove and insert the pen cap. At the same time, the presence of the pen lugs can prevent the pen cap from rolling around when placed, enhancing the stability of the pen cap, especially suitable for smooth surfaces such as desktops, reducing the risk of the pen cap accidentally falling or being lost. In addition, the pen lugs can also serve as an identification feature for the pen cap, making it easy for users to quickly distinguish the front and back of the pen cap, improving usage efficiency.

[0020] In summary, this utility model has the following beneficial effects:

[0021] 1. The locking module effectively fixes and moves the piston structure.

[0022] 2. By using the threads at the bottom of the connecting rod and the threads inside the piston, the connecting rod and piston can be fixed together.

[0023] 3. The pen cap helps prevent damage to the pen tip and ink contamination. Attached Figure Description

[0024] Figure 1 This is an overall schematic diagram of Embodiment 1, used to illustrate the connection relationship between the pen cap and the water reservoir;

[0025] Figure 2 This is a schematic diagram of the structural connection between the feed, the tip, and the reservoir in Example 1;

[0026] Figure 3 This is a cross-sectional view of Embodiment 1 used to illustrate the internal locking module of the water storage tank;

[0027] Figure 4 This is a schematic diagram illustrating the structural connection of the connecting rod and piston in Example 1;

[0028] Figure 5 This is a schematic diagram illustrating the structural connection of the connecting rod and piston in Example 2;

[0029] Figure 6 This is a partial enlarged view of Example 2 used to illustrate the connecting rod-piston connection.

[0030] In the diagram, 1. Pen tip; 2. Water channel; 3. Pen feed; 4. First cylinder; 5. Water reservoir; 6. Pen cap; 7. First cylindrical protrusion; 8. First rectangular block; 9. Triangular pin; 10. Spring; 11. Round rod; 12. Second cylinder; 13. First rectangular groove; 14. First round hole; 15. First rectangular hole; 16. Second rectangular hole; 17. Piston; 18. Connecting rod; 19. Pen cover; 20. Third cylinder; 21. First annular protrusion; 22. Second annular protrusion; 23. Clearance groove; 24. Pen lug; 25. Protrusion; 26. Second cylindrical protrusion; 27. Second round hole. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. 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 specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0033] Example 1:

[0034] like Figures 1-4 As shown, an integrated ink cartridge for a fountain pen includes a nib 1 with a water guide groove 2 on its left end face to guide ink flow; a feed 3 inserted into the nib 1 to guide ink flow; a first cylinder 4 fixedly mounted on the top of the feed 3 with a vertically penetrating first through hole, the axis of which is vertically aligned, for easy gripping by the writer; and a water reservoir 5 fixedly mounted on the top of the first cylinder 4, with a connecting rod piston module slidably mounted inside. The water reservoir stores ink and a pen cap 6, which is screwed to the first cylinder 4. The axis of the pen cap 6 is collinear with the axis of the first cylinder 4, and the top surface of the pen cap 6 is in contact with the bottom surface of the water reservoir 5 to protect the nib from damage.

[0035] The top of the water reservoir 5 is provided with an integrally formed first cylindrical protrusion 7. The axis of the first cylindrical protrusion 7 is collinear with the axis of the water reservoir 5. The first cylindrical protrusion 7 is provided with external threads. The top of the first cylindrical protrusion 7 is provided with a second through hole that runs vertically through the water reservoir. The axis of the second through hole is collinear with the axis of the first cylindrical protrusion 7. The second through hole is connected to the water reservoir 5. A locking module is provided inside the water reservoir 5.

[0036] The piston module includes a piston 17, a connecting rod 18, and a pen cover 19. The piston 17 has a fourth through hole extending vertically through its top, with the axis of the fourth through hole vertically aligned. The bottom end of the fourth through hole has an internal thread. A third cylinder 20 is fixedly mounted on the top of the piston. The third cylinder 20 has a fifth through hole extending vertically through its top, with the axis of the fifth through hole vertically aligned. The fifth through hole communicates with the fourth through hole. A first annular protrusion 21 is slidably mounted on the bottom end of the third cylinder 20. The inner diameter of the bottom end of the first annular protrusion 21 is smaller than the inner diameter of its top end. The axis of the first annular protrusion 21 is aligned with the axis of the third cylinder 18. The axes of the cylinders 20 are collinear. A second annular protrusion 22 is fixedly installed at the top of the third cylinder 20. The inner diameter of the bottom end of the second annular protrusion 22 is larger than the inner diameter of the top end. The axis of the second annular protrusion 22 is collinear with the axis of the third cylinder 20. A connecting rod 18 is inserted into the fourth through hole. An oil seal is provided between the fourth through hole and the connecting rod 18. The axis of the connecting rod 18 is collinear with the axis of the fourth through hole. The bottom end of the connecting rod 18 is provided with an external thread. The connecting rod 18 slides with the piston 17. A pen cover 19 is fixedly installed at the top of the connecting rod 18. The pen cover 19 is provided with an internal thread.

[0037] The locking module is detachably installed on the inner top of the water reservoir 5. The locking module includes a first rectangular block 8, a triangular pin 9, a spring 10, a round rod 11, and a second cylinder 12. The top of the first rectangular block 8 is provided with a third through hole extending vertically, and the axis of the third through hole is vertically aligned. The bottom of the first rectangular block 8 is provided with an upward-facing first rectangular groove 13, and the axis of the first rectangular groove 13 is collinear with the axis of the third through hole. The left and right end faces of the first rectangular block 8 are symmetrically provided with first circular holes 14, and the axes of the first circular holes 14 are horizontally aligned. One end of the inner end face of the first circular hole 14 is provided with a first rectangular hole 15, and the axis of the first rectangular hole 15 is collinear with the axis of the first circular hole 14. The first rectangular hole 15 communicates with the first circular hole 14. A second rectangular hole 16 is provided at one end of the end face. The axis of the second rectangular hole 16 is collinear with the axis of the first rectangular hole 15. The second rectangular hole 16 is connected to the first rectangular hole 15 and the first rectangular groove 13. A spring 10 is fixedly installed in the first rectangular hole 15. The axis of the spring 10 is collinear with the axis of the first rectangular hole 15. A round rod 11 is inserted in the spring 10. The axis of the round rod 11 is collinear with the axis of the spring 10. A triangular pin 9 is fixedly installed on the inner end face of the round rod 11. The top end face of the triangular pin 9 is in contact with the inner top end face of the second rectangular hole 16. The bottom end face of the triangular pin 9 is in contact with the inner bottom end face of the second rectangular hole 16. A second cylinder 12 is fixedly installed on the outer end face of the round rod 11. The axis of the second cylinder 12 is collinear with the axis of the round rod 11.

[0038] The first cylinder 4 has symmetrical clearance grooves 23 on its circumference. The top of the first cylinder 4 has an external thread. The bottom of the pen cap 6 has a pen lug 24 fixedly installed. The inner top of the pen cap 6 has an internal thread.

[0039] Specific implementation process: Unscrew the pen cover 19, and control the connecting rod 18 by controlling the pen cover 19. Completely immerse the pen tip 3 in the ink. Screw the connecting rod 18 into the fourth through hole. At this time, the connecting rod 18 is fixedly connected to the piston 17. Pulling the pen cover 19 moves the piston 17 upwards. Under pressure, the ink enters the water reservoir 5 along the pipe. After the ink is drawn in, pull the connecting rod 18 to make the second annular protrusion 22 on the piston 17 enter the first rectangular groove 13 in the locking module at the top of the water reservoir 5. The second annular protrusion 22 presses against the triangular pin 9. When the second annular protrusion 22 moves to the top of the triangular pin, the triangular pin 9 is retracted to its original position under the action of the spring 10. Thus, the bottom of the second annular protrusion 22 is locked by the triangular pin 9. At this time, the piston 17... When the pen cap 19 is fixed, rotating the pen cap 19 drives the connecting rod 18, causing the connecting rod 18 to unscrew from the fourth through hole and push the connecting rod 18 to the bottom of the water reservoir 5. Then, the pen cap 19 is screwed onto the water reservoir 5, thus completing one ink absorption operation. If ink absorption or emptying is required again, because the piston 17 is connected to the locking module, the connecting rod 18 needs to be screwed onto the fourth through hole again. Then, the connecting rod 18 is pulled upward, so that the top surface of the first annular protrusion 21 is in contact with the bottom surface of the second annular protrusion 22. Due to the pressure of the top of the first annular protrusion 21 on the triangular pin 9, the triangular pin 9 retracts from the bottom of the second annular protrusion 22 into the second rectangular hole 16. Then, the connecting rod 18 is pushed downward, and the piston 17 is removed from the locking module. Repeating the above operations can complete the ink absorption and ink emptying operations.

[0040] Example 2:

[0041] like Figures 5-6 As shown, an integrated pen ink cartridge has a locking module fixedly installed at the bottom of a piston 17. The locking module includes a piston 17, a connecting rod 18, a protrusion 25, a second cylindrical protrusion 26, and a second round hole 27. An oil seal is provided between the piston 17 and the water reservoir 5, and an oil seal is provided between the piston 17 and the connecting rod 18. An installation groove is provided at the bottom of the piston 17, and a second round hole 27 is provided in the installation groove. An integrally formed protrusion 25 is provided at the bottom end of the connecting rod 18, and the bottom end of the protrusion 25 is slidably installed in the installation groove. An integrally formed second cylindrical protrusion 26 is provided at the bottom end of the protrusion 25.

[0042] Specific implementation process: Unscrew the pen cover 19, and rotate the pen cover 19 to drive the connecting rod 18 to rotate, causing the protrusion 25 to move in the mounting groove, and then causing the second cylindrical protrusion 26 on the protrusion 25 to move in the mounting groove. Insert the second cylindrical protrusion 26 into the second round hole 27 of the mounting groove. At this time, the connecting rod 18 is fixedly connected to the piston 17. The pen tip 3 is completely immersed in the ink. Pull the pen cover 19 to drive the connecting rod 18 to move upward, and then drive the piston 17 to move upward. Under the action of pressure, the ink will enter the water reservoir 5 along the pipe. After the ink is sucked in, rotate the pen cover 19 to drive the connecting rod 18 to rotate, and then drive the second cylindrical protrusion 26 to rotate, so that the second cylindrical protrusion 26 moves out of the second round hole 27. Then push the connecting rod 18 to move downward. After pushing the connecting rod 18 to the bottom of the water reservoir 5, screw the pen cover 19 to the water reservoir 5. Repeat the above operations to complete the ink sucking and discharging work.

[0043] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0044] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. An integrated ink cartridge for a fountain pen, characterized in that, include: The pen tip (1) has a water guide groove (2) on its left end face, which is used to guide the flow of ink. The pen tongue (3) is inserted into the pen tip (1) and is used to guide the flow of ink. The first cylinder (4) is fixedly installed on the top of the pen feed (3). The first cylinder (4) has a through hole running vertically through it. The axis of the first through hole is vertically set. The first cylinder (4) is designed for easy holding by the writer. A water reservoir (5) is fixedly installed on the top of the first cylinder (4). A connecting rod piston module is slidably installed inside the water reservoir (5). The water reservoir (5) is used to store ink. The pen cap (6) is screwed to the first cylinder (4). The axis of the pen cap (6) is collinear with the axis of the first cylinder (4). The top surface of the pen cap (6) is in contact with the bottom surface of the water reservoir (5). The pen cap (6) is used to protect the pen tip from damage.

2. The integrated ink cartridge for a fountain pen according to claim 1, characterized in that: The top of the water reservoir (5) is provided with an integrally formed first cylindrical protrusion (7). The axis of the first cylindrical protrusion (7) is collinear with the axis of the water reservoir (5). The first cylindrical protrusion (7) is provided with an external thread. The top of the first cylindrical protrusion (7) is provided with a second through hole that runs vertically through the top and bottom. The axis of the second through hole is collinear with the axis of the first cylindrical protrusion (7). The second through hole communicates with the water reservoir (5). A locking module is provided inside the water reservoir (5).

3. The integrated ink cartridge for a fountain pen according to claim 1, characterized in that: The piston module includes a piston (17), a connecting rod (18), and a pen cover (19). The piston (17) has a fourth through hole extending vertically through its top, with the axis of the fourth through hole being vertically oriented. The bottom end of the fourth through hole has an internal thread. A third cylinder (20) is fixedly mounted on the top of the piston. The third cylinder (20) has a fifth through hole extending vertically through its top, with the axis of the fifth through hole being vertically oriented. The fifth through hole communicates with the fourth through hole. A first annular protrusion (21) is slidably mounted on the bottom end of the third cylinder (20). The axis of the piston (17) is collinear with the axis of the third cylinder (20). The top of the third cylinder (20) is detachably mounted with a second annular protrusion (22). The axis of the second annular protrusion (22) is collinear with the axis of the third cylinder (20). A connecting rod (18) is inserted into the fourth through hole. The axis of the connecting rod (18) is collinear with the axis of the fourth through hole. The bottom end of the connecting rod (18) is provided with an external thread. The connecting rod (18) is slidably mounted with the piston (17). A pen cover (19) is fixedly installed at the top of the connecting rod (18). The pen cover (19) is provided with an internal thread.

4. The integrated ink cartridge for a fountain pen according to claim 2, characterized in that: The locking module is detachably installed on the inner top of the water reservoir (5). The locking module includes a first rectangular block (8), a triangular pin (9), a spring (10), a round rod (11), and a second cylinder (12). The top of the first rectangular block (8) is provided with a third through hole that runs vertically through the top and bottom. The axis of the third through hole is vertically arranged. The bottom of the first rectangular block (8) is provided with an upward-facing first rectangular groove (13). The axis of the first rectangular groove (13) is collinear with the axis of the third through hole. The left and right end faces of the first rectangular block (8) are symmetrically provided with first circular holes (14). The axis of the first circular holes (14) is arranged horizontally. One end of the inner end face of the first circular hole (14) is provided with a first rectangular hole (15). The axis of the first rectangular hole (15) is collinear with the axis of the first circular hole (14). The first rectangular hole (15) communicates with the first circular hole (14). One end of the inner end face of the first rectangular hole (15) is provided with a first rectangular hole (15). A second rectangular hole (16) is provided, the axis of which is collinear with the axis of the first rectangular hole (15). The second rectangular hole (16) communicates with the first rectangular hole (15) and the first rectangular groove (13). A spring (10) is fixedly installed in the first rectangular hole (15), the axis of which is collinear with the axis of the first rectangular hole (15). A round rod (11) is inserted into the spring (10). The axis of the rod (11) is collinear with the axis of the spring (10). A triangular pin (9) is fixedly installed on the inner end face of the rod (11). The top end face of the triangular pin (9) is in contact with the inner top end face of the second rectangular hole (16). The bottom end face of the triangular pin (9) is in contact with the inner bottom end face of the second rectangular hole (16). A second cylinder (12) is fixedly installed on the outer end face of the rod (11). The axis of the second cylinder (12) is collinear with the axis of the rod (11).

5. The integrated ink cartridge for a fountain pen according to claim 2, characterized in that: The locking module is detachably installed at the bottom of the piston (17). The locking module includes the piston (17), connecting rod (18), protrusion (25), second cylindrical protrusion (26) and second round hole (27). The bottom of the piston (17) is provided with an installation groove, and the second round hole (27) is provided in the installation groove. The bottom end of the connecting rod (18) is provided with an integrally formed protrusion (25), and the bottom end of the protrusion (25) is slidably installed in the installation groove. The bottom end of the protrusion (25) is provided with an integrally formed second cylindrical protrusion (26).

6. The integrated ink cartridge for a fountain pen according to claim 1, characterized in that: The first cylinder (4) has symmetrical clearance grooves (23) on its circumference, and the top of the first cylinder (4) has an external thread.

7. The integrated ink cartridge for a fountain pen according to claim 1, characterized in that: The pen cap (6) has a pen lug (24) fixedly installed at its bottom end, and the inner top end of the pen cap (6) is provided with an internal thread.

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