Fountain pen with quick-fill coupling

Abstract

A fountain pen with a quick-fill coupling is proposed, comprising a nib assembly, a housing in which a main reservoir and a writing reservoir are formed, a rotatable tapered portion at the end of the fountain pen facing away from the nib assembly, and a coupling for mounting the housing on an ink supply device, wherein a first seal unit is arranged between the writing reservoir and the main reservoir, the first seal unit being selectively openable and closeable for filling the writing reservoir by the main reservoir, a second seal unit is arranged between the writing reservoir and the nib assembly, the second seal unit being selectively openable and closeable for supplying ink to the nib assembly, and a third seal unit is arranged between the main reservoir and the coupling, the tapered portion being linked to a mechanism configured to control the open state of at least the first seal unit and the second seal unit.

Description

Technical Field

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[0001] The present invention relates to a fountain pen having a quick - filling coupling, and to a writing instrument system having a fountain pen and an ink supply device.

Background Art

[0002] Valuable writing instruments having a pen tip assembly often have a piston tank that can be filled by dipping the pen tip assembly into an ink container and by turning a tapered portion disposed opposite the pen tip assembly. After the filling process, it is meaningful to clean the pen tip assembly. For example, when using such a fountain pen on an airliner where the pressure is significantly lower than on the ground at passenger flight altitudes, the reduced pressure can act on the piston tank, and sometimes ink may leak out of the pen tip assembly.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The problem of the present invention is to propose a fountain pen that at least partially eliminates the above - mentioned drawbacks. Nevertheless, at the same time, this fountain pen should be as easy to operate as possible.

Means for Solving the Problems

[0004] This problem is solved by a fountain pen having the features of independent claim 1. Preferred embodiments and developments will become apparent from the dependent claims and the following description.

[0005] A fountain pen with a quick-fill coupling is proposed, comprising a nib assembly, a housing in which a main tank and a writing tank are formed, a rotatable tapered portion at the end of the fountain pen opposite the nib assembly, and a coupling for mounting the housing on an ink supply device, wherein a first seal unit is positioned between the writing tank and the main tank, which can be selectively opened and closed to allow the main tank to fill the writing tank; a second seal unit is positioned between the writing tank and the nib assembly, which can be selectively opened and closed to supply ink to the nib assembly; and a third seal unit is positioned between the main tank and the coupling, which can be opened and closed to allow the main tank to fill; and the tapered portion is linked to a mechanism configured to control the open state of at least the first and second seal units.

[0006] A pen nib assembly can be understood as a unit consisting of a pen nib and an ink conduit. The pen nib is fitted into or inserted into the ink conduit and fluidly connected to the ink in the capillary tube that provides conductivity within the ink conduit.

[0007] The housing provides the main external shape of the writing instrument and is sometimes called the container. The housing or container is held by the user when writing. The special feature of the fountain pen according to the present invention is that the tank is subdivided into a main tank and a writing tank. The writing tank can be supplied with ink, for example, by being directly fluidly connected to the nib assembly.

[0008] The size of the writing tank can be significantly reduced compared to the usual size of a piston tank. Furthermore, the writing tank serves only to temporarily supply ink to the nib assembly. Therefore, the effects of lower pressure on the significantly smaller writing tank volume compared to a conventional piston tank can be significantly limited. When the writing tank becomes empty, it can be refilled directly within the fountain pen by selectively establishing a fluid connection with the main tank.

[0009] The tapered portion ends on the same plane as the housing and preferably has a surface shape that is tangentially continuous with respect to the housing. The user can perform the above function by gripping the housing and rotating the tapered portion.

[0010] Therefore, the fountain pen according to the present invention is configured to achieve a writing state by closing the first and third seal units and by opening the second seal unit. When the first seal unit is opened, the second seal unit is closed, and the third seal unit is closed, the writing tank can be refilled with ink from the main tank. At this time, it is preferable to tilt the fountain pen slightly so that the writing tip points downward. When the first and third seal units are opened and the second seal unit is closed, ink can be supplied to the main tank and the writing tank via the coupling. Accordingly, the filling of the fountain pen is achieved through the coupling, not through the nib assembly. In order to prevent the pressure difference that may occur during the above-described filling process from leading to ink leakage, a specific order of opening and closing each seal unit may be intended.

[0011] As an ink supply device, a type of filling system can be used that supplies ink from a separate container. This can be done mechanically or electrically. The ink supply device may have an air passage and an ink passage, each manufactured as a small tube. The air passage may be positioned concentrically within the ink passage. It may be useful to release a specific amount of air through the air passage to flush out the ink in the tank and thus completely empty the fountain pen. Subsequently, the air is drawn out through the air passage, allowing the ink to be drawn in through the ink passage, after which this ink flows from the container into the tank. At this time, it is preferable that the air volume or ink volume be adjusted to suit a particular fountain pen in order to achieve complete filling of the tank. At this time, the fountain pen may be aligned so that the writing tip is facing upward. If such a filling system is used, the remaining ink in the fountain pen can first be transferred to the container, and then the fountain pen can be filled with ink.

[0012] It is particularly preferable that the writing tank be positioned between the nib assembly and the main tank. Therefore, the writing tank is positioned directly or approximately directly in front of the nib assembly. In this case, there is only a second sealing unit between the nib assembly and the writing tank, which is opened for supplying or cleaning ink to the nib assembly and closed for refilling the writing tank.

[0013] It is preferable that the tapered section is removable and conceals the coupling when it is placed in the housing. In this case, the coupling is visible and accessible only when the tapered section is removed. This not only improves the appearance of the fountain pen itself, but also provides better protection for the coupling from dirt.

[0014] The first seal unit may have a sleeve and a complementaryly molded first seal body that is linearly slidable into and out of the sleeve. Thus, the first seal body can be placed inside the sleeve, and a radial seal can be formed with the sleeve, for example, by a circumferential seal ring. Sliding the first seal body out of the sleeve can cause the first seal unit to open. Conversely, sliding the first seal body into the sleeve can close the opening. Therefore, only axial motion is required to establish or release the seal. A funnel-shaped entry end may be provided to create a particularly simple guide for the first seal body into the sleeve.

[0015] The mechanism preferably has a longitudinal sliding member configured to slide linearly within the housing, which is linked to the first seal body. The first seal unit can be operated by simply sliding the longitudinal sliding member accordingly. The first seal unit can also be operated from the end of the housing where the tapered portion is located, either by being positioned along the central axis or parallel thereto.

[0016] In a preferred embodiment, the second sealing unit comprises a second sealing body and a sealing surface having a through hole, wherein the second sealing body is linearly pressable against the sealing surface to cover the through hole. Therefore, only a through hole that can be selectively concealed by the second sealing body may be located between the writing tank and the nib assembly. The second sealing body may be made of an elastic material that can be axially pressed against the through hole. This prevents ink leakage from the writing tank to the nib assembly.

[0017] It is particularly preferable that the first and second seals are linked to each other via a spring that applies an axial spring force. This allows the motion of the first seal to be linked to the motion of the second seal. When the first seal moves axially toward the pen tip assembly, a compression spring positioned between the second and first seals will be able to move the second seal toward the through hole. Then, to guide the first seal out of the sleeve with a time offset, the motion of the first seal is easily allowed to continue after the second seal makes surface contact with the sealing surface. In this case, the spring is compressed, and the second seal is pressed more firmly toward the through hole. The mechanism is thus clearly simplified.

[0018] In a particularly preferred embodiment, the first and second seal units are mutually transitionable to a writing position, a refilling position, and a cleaning position, where the first seal unit is closed and the second seal unit is open in the writing position, the first seal unit is open and the second seal unit is closed in the refilling position, and both the first and second seal units are open simultaneously in the cleaning position. The writing and refilling positions are preferably reached by rotating the tapered section to a specific position. The cleaning position is the position in which the fountain pen is configured to perform a rinse of the entire fountain pen with a cleaning fluid. The fountain pen can be fitted into a cleaning device by its coupling, which subsequently conducts the cleaning fluid. It is preferable that this cleaning position is not directly set by the tapered section, and is set particularly after the tapered section and the like are removed, through a hidden release means, for example, through a suitable tool.

[0019] In another preferred embodiment, the longitudinal sliding member is rotatable by a tapered portion and is linked to a cam sleeve that performs linear sliding of the longitudinal sliding member. Accordingly, the longitudinal sliding is performed by a cam sleeve having a cam that moves a projection or the like. By rotating the tapered portion, the cam sleeve can be rotated, thereby causing the projection inside to move axially. In this case, longitudinal guidance of the cam sleeve is useful in order to avoid rotation of the object driven by the projection.

[0020] In a preferred embodiment, the third seal unit has at least one seal made of a rubber-elastic material with a passage extending inward. A small tube for, for example, ink and / or air may be inserted through the third seal unit. The rubber-elastic material may be an elastomer or a material having elastomer properties at least at room temperature.

[0021] Preferably, the third seal unit has two longitudinally spaced seal materials, each having a passage portion having a diameter that decreases in the direction opposite to the coupling, the passage portion of the first seal material closer to the coupling can be fluidly connected to the main tank, and the second seal material facing away from the coupling can be fluidly connected to the writing tank. This allows two coaxial conduits of different lengths to be in contact with both seal materials. The first seal material may be intended for air transfer, while the second seal material may be intended for ink transfer.

[0022] The longitudinal sliding member is preferably hollow, allowing for a fluid connection between the second passage and the writing tank. Accordingly, the longitudinal sliding member can guide air, or ink, depending on the design. Therefore, the limited design space inside the fountain pen can be effectively utilized through this dual function.

[0023] Furthermore, the tapered portion is preferably removable by bayonet joint. The bayonet joint is easy to move and robust, and thus can be operated repeatedly. The bayonet joint enables easy attachment and easy detachment.

[0024] Furthermore, the present invention relates to a writing instrument system having a fountain pen and an ink supply device, and has an air passage that can be guided by a third seal unit and an ink passage separated from the air passage. The ink supply device is configured to introduce air into the air passage and suck air out of the air passage, and the ink passage can be fluid-connected to an ink container.

[0025] [[ID=H8]]Other components, advantages, and applicability of the present invention will become apparent from the following description of embodiments and the drawings. All components described herein and / or shown in the drawings, individually and in any combination, constitute the subject matter of the present invention regardless of how they are assembled in the individual claims and their references. Further, in the drawings, the same reference numerals represent the same or similar objects.

Brief Description of the Drawings

[0026] [Figure 1] It is a figure which shows a fountain pen in a side cross section. [Figure 2] It is a detailed view which shows a side cross section of a fountain pen. [Figure 3] It is a detailed view which shows a side cross section of a fountain pen. [Figure 4] It is a detailed view which shows a side cross section of a fountain pen. [Figure 5] It is a figure which shows the details of a fountain pen in one state. [Figure 6] It is a figure which shows the details of a fountain pen in one state. [Figure 7] It is a figure which shows the details of a fountain pen in one state. [Figure 8] It is a figure which shows the details of a fountain pen in one state. [Figure 9] It is a figure which shows the details of a fountain pen in one state. [Figure 10] This is a diagram showing the details of a fountain pen in one state. [Figure 11] This is a diagram showing the details of a fountain pen in one state. [Figure 12] This diagram shows a fountain pen along with an ink supply device and ink container. [Modes for carrying out the invention]

[0027] Figure 1 shows an overall view of the fountain pen 2 for illustrative purposes, while subsequent drawings show individual details. The fountain pen 2 has a nib assembly 4 comprising a nib 6 and an ink conduit 8 that supports the nib 6. The nib assembly 4 is located on the front side of the housing 10.

[0028] Furthermore, a main tank 12 and a writing tank 14 are formed within the housing 10. The writing tank 14 is significantly smaller than the main tank 12 and can be refilled. For this purpose, a first seal unit 16 is positioned between the writing tank 14 and the main tank 12, which can selectively establish or prevent fluid connection between the main tank 12 and the writing tank 14. The writing tank 14 is in direct contact with the nib assembly, and a second seal unit 18 is positioned between the writing tank 14 and the nib assembly 4. This allows for selective establishment of fluid connection between the writing tank 14 and the nib assembly 4.

[0029] A rotatable tapered section 20 is located at the rear end of the housing 10. This can be removed from the housing 10. Further there is a coupling 22, which allows the fountain pen 2 to be fitted into an ink supply device (not shown). Between the coupling 22 and the main tank 12 is a third seal unit 24, which can be selectively opened and closed to fill the main tank 12. Here, the tapered section 20 is linked to a mechanism 26 configured to control the open state of at least the first seal unit 16 and the second seal unit 18. Thus, the fountain pen 2 can be put into a writing state by rotating the tapered section 20, or into a state for filling the writing tank 14 with the main tank 12.

[0030] Figure 2 shows the rear portion of the fountain pen 2. Here, the tapered portion 20 has a tapered screw 28 that is screwed to the tapered portion 20 via an assembly screw 30. A bayonet sleeve 32, which is coupled to the tapered portion 20 in a way that prevents relative rotation, engages with a projection 34 of the cam sleeve 36. This is in surface contact with the wing portion 38 of the tank bush 40, which is guided in a groove 42 located radially outward, thereby causing the tank bush 40 to move only linearly. A compression spring 44 is located on the side of the wing portion 38 that faces away from the cam sleeve 36, pressing the wing portion 38 and consequently the tank bush 40 toward the tapered portion 20. Therefore, by rotating the tapered portion 20, the bayonet sleeve 32 coupled to the cam sleeve 36 via the projection 34 rotates, thus transmitting rotational motion. This causes the tank bush 40 to move axially, and consequently slides the longitudinal sliding member 48.

[0031] The coupling 24 may, for example, have a gap 50 between the tank bush and the cam sleeve 36. Through this gap, the fountain pen 2 can be fitted into the ink supply device. By rotating the tapered portion 20 in a predetermined direction, the bayonet sleeve 32 can be detached from the projection 34, thereby allowing the tapered portion 20, along with the tapered screw 28 and the bayonet sleeve 32, to be removed from the fountain pen 2 as a set. When the tapered portion 20 is reattached together with the bayonet sleeve 32, the tension spring 52 is pulled slightly to the left when viewed in the paper, thereby exerting a certain degree of holding force on the bayonet sleeve 32 or projection 34. This initial stress provides good tactile feedback to the user through the snap-fit ​​of the bayonet joint.

[0032] The third seal unit 22 has a first seal material 54 made of a rubber elastic material that allows a tube to be inserted into the insertion opening 56. This tube, for example, an ink passage 53, may extend through the passage 55 and throughout the first seal material 54, ending on the side of the first seal material 54 facing away from the insertion opening 56, as shown by the dashed line. A second seal material 58 follows this, which allows a tube having an even smaller diameter, such as an air passage 53, to be inserted into the passage 57, and this tube extends entirely through the second seal material 58, ending on the side of the second seal material 58 facing away from the first seal material 54, as also indicated by the dashed line. The first seal material 54 allows the insertion of an ink supply tube. The ink can enter the intermediate space between both seal materials 54 and 58 and flow towards the main tank 12 through the axially following annular gap 60. On the other hand, the longitudinal sliding member 48 is made hollow and is fluidly connected to the narrower tube that passes through the second sealing material 58. This plays a role in the transfer of air in particular, which will be explained in more detail later.

[0033] Figure 3 shows the central area of ​​the fountain pen 2 and, in particular, the main tank 12. A longitudinal sliding member 48 runs through here and extends along the long axis of the fountain pen 2. Here, on the left side as seen in the paper, we can see the first seal unit 16. It has a sleeve 62 with an inner wall 64. Along the inner wall 64, a first seal body 66 can slide, carrying a seal ring 68 on its outer circumference. When the seal ring 68 is completely inside the inner surface 64, fluid connection between the main tank 12 and the writing tank 14 is prevented. Since the seal body 66 is coupled with the longitudinal sliding member 48, the movement of the sliding member 48 can open or close the first seal unit 16. For the record, it should be noted that there is an additional seal ring 70 that seals the sleeve 62 outward toward the housing 10.

[0034] Figure 4 shows the area facing the pen tip assembly 4. Here, we can see a second seal unit 16 having a sealing surface 72 on which a through hole 74 is located. A second seal body 76, for example made of a rubber elastic material, can be pressed against the sealing surface 72 by axial sliding. This closes the through hole 74 and thus prevents fluid connection between the writing tank 14 and the pen tip assembly 4. The second seal body 76 is pivoted via a spring 78 coupled to the first seal body 66. The hollow space 80 of the longitudinal sliding member 48 is connected to the fluid passage 82 of the first seal body 66, thereby allowing air, in particular, to enter the writing tank 14 from the hollow space 80 through the spring 78.

[0035] After removing the tapered section 20, the fountain pen 2 can be set on an ink supply device (not shown) using the coupling 22. At this time, the air passage can be connected to the second seal material 58 and the ink passage can be connected to the first seal material 54. The air passage can guide air into the writing tank 14 through the hollow space 48, thereby allowing the ink inside to enter the main tank 12 through the open first seal unit 16, and from there to be led out through the annular passage 60 and the ink passage. Subsequently, as air is drawn out from the hollow space 48, the ink can be drawn in through the ink passage, i.e., the first seal material 54, thereby allowing it to flow through the main tank 12 and the writing tank 14 to the flow passage 82, filling both tanks 12 and 14 in the process.

[0036] To write using the fountain pen 2, the first seal unit 16 is closed and the second seal unit 18 is opened. This can be done by rotating the tapered portion 20 to a specific rotational position. Here, Figure 5 shows the projection 34 and the bayonet sleeve 32 in three dimensions. The cam sleeve 36 can be seen moving into the position where the projection 34 is retracted within the control cam 84. Thus, the first seal body 66 and the second seal body 76 are facing away from the nib assembly 4. The bayonet sleeve 32 is engaged with the bayonet 86, and the tapered portion 20 is fixedly positioned on the fountain pen.

[0037] Figure 6 shows the positions of both seals 66 and 76 as described above. Refilling the writing tank 14 with ink from the main tank 12 can be done by closing the second seal unit 18 and opening the first seal unit 16. This means that both seals 66 and 76 must slide to the left when viewed from the paper. This is evident from the projection 34 shown in Figure 7, which slides to the left within the control cam 84. Thus, as shown in Figure 8, ink overflow from the main tank 12 to the writing tank 14 is possible, as indicated by the flow arrow.

[0038] The bayonet sleeve 32 may be set up by a stopper or other type of shielding so that it rotates only between the writing position and the refilling position, in which both seal units 16 and 18 are opened alternately. It is preferable to close both seal units 16 and 18 in an intermediate position by rotating the tapered section 20, thereby ensuring that only one of the seal units 16 and 18 can be opened at any given time. Therefore, a cleaning position in which both seal units 16 and 18 are opened simultaneously cannot be set by the tapered section 20. However, for cleaning the fountain pen 2, the tapered section 20 can be removed and a tool 88 can be applied to the cam sleeve 36 and moved in a different direction. This is shown in Figures 10 and 11. The tool 88 moves the seal bodies 66 and 76 to a position in which they are opened. To this end, both seal bodies 66 are slid in the direction of the tapered section 20, thereby causing the first seal body 66 to come out on the side of the sleeve 62 facing away from the nib assembly 4. Accordingly, a fluid connection is established that extends throughout the fountain pen 2. For example, the fountain pen 2 can be washed by introducing a cleaning solution through the first sealing material 54.

[0039] Finally, Figure 12 shows the ink supply device 90 above the ink container 92, with the fountain pen 2 fitted into the ink supply device 90. The ink supply device is configured such that when the fountain pen 2 is pressed against the ink supply device 90, it first guides air through the air passage and then draws out air, thereby allowing additional ink to flow from the ink passage connected to the ink container 92, as described above. The illustrated structure forms a writing instrument system 94.

[0040] As a supplement, it should be noted that "having" does not exclude other components or steps, and "one" does not exclude multiple components. Furthermore, it should be noted that the constituent elements described with reference to one of the embodiments above can also be applied in combination with other constituent elements of another embodiment described above. The reference numerals in the claims should not be considered limiting. [Explanation of Symbols]

[0041] 2 fountain pen 4. Pen tip assembly 6 nibs 8 Ink conduits 10 Housing 12 Main Tanks 14 Writing Tank 16. First seal unit 18. Second seal unit 20 Tapered section 22 Coupling 24 Third seal unit 26 Mechanism 28 Tapered thread 30 Screw Assembly 32 bayonet sleeves 34 Protrusion 36 Cam Sleeve 38 Wings 40 Tank Bushings 42 Groove 44 Compression spring 46 Inner area 48 Longitudinal sliding member 50 gap 52 Tension Springs 53 Ink passage 54 First sealing material 55 Passage section 56 Insertion opening 57 Passage section 58 Second sealing material 59 Air passage 60 gap 62 sleeves 64 Inner wall 66 First seal body 68 Seal rings 70 sealing rings 72 sealing surface 74 Passing hole 76 Second seal 78 springs 80 Hollow space 82 Flow passage 84 Control Cam 86 Bayonet 88 Tools 90 Ink supply device 92 Ink containers 94 Writing Instrument Systems

Claims

1. In a fountain pen (2) having a quick-fill coupling, Pen tip assembly (4), A housing (10) in which a main tank (12) and a writing tank (14) are formed, A rotatable tapered portion (20) is located at the end of the fountain pen (2) that faces away from the nib assembly (4), The device includes an ink supply device (90) and a coupling (22) for mounting the housing (10) on top of it. A first seal unit (16) is positioned between the writing tank (14) and the main tank (12), which can be selectively opened and closed in order for the main tank (12) to fill the writing tank (14). A second seal unit (18) is positioned between the writing tank (14) and the pen tip assembly (4), which can be selectively opened and closed in order to supply ink to the pen tip assembly (4). A third seal unit (24) is positioned between the main tank (12) and the coupling (22), which can be opened and closed to fill at least the main tank (12). The tapered portion (20) is linked to a mechanism (26) configured to control the open state of at least the first seal unit (16) and the second seal unit (18), The passage portion (55, 57) of the first sealing material (54) of the third seal unit (24) closer to the coupling (22) can be fluidly connected to the main tank (12), and the second sealing material (58) of the third seal unit (24) facing away from the coupling (22) can be fluidly connected to the writing tank (14). fountain pen.

2. The fountain pen (2) according to claim 1, wherein the writing tank (14) is positioned between the nib assembly (4) and the main tank (12).

3. The fountain pen (2) according to claim 1 or 2, wherein the tapered portion (20) is removable and conceals the coupling (22) when positioned in the housing (10).

4. The fountain pen (2) according to claim 1, wherein the first seal unit (16) comprises a sleeve (62) and a complementaryly molded first seal body (66) that is linearly slidable to enter into the sleeve (62) and to exit the sleeve (62).

5. The fountain pen (2) according to claim 4, wherein the mechanism (26) has a longitudinal sliding member (48) configured to slide linearly within the housing (10) and is linked to the first seal (66).

6. The fountain pen (2) according to claim 1, wherein the second sealing unit (18) has a second sealing body (76) and a sealing surface (72) on which a through hole (74) is disposed, and the second sealing body (76) is pressable linearly against the sealing surface (72) to cover the through hole (74).

7. The first seal unit (16) comprises a sleeve (62) and a complementaryly molded first seal body (66) that is linearly slidable to enter into the sleeve (62) and to exit the sleeve (62), The second seal unit (18) has a second seal body (76) and a seal surface (72) on which a through hole (74) is arranged, and the second seal body (76) can be pressed linearly against the seal surface (72) to cover the through hole (74). The fountain pen (2) according to claim 1, wherein the first seal (66) and the second seal (76) are linked to each other via a spring (78) that applies an axial spring force.

8. The first sealing unit (16) and the second sealing unit (18) are mutually movable between the writing position, the refilling position, and the cleaning position. At the writing position, the first seal unit (16) is closed and the second seal unit (18) is opened. At the replenishment position, the first seal unit (16) is opened and the second seal unit (18) is closed. In the aforementioned cleaning position, the first seal unit (16) and the second seal unit (18) are opened simultaneously. The fountain pen (2) according to claim 1.

9. The fountain pen (2) according to claim 5, wherein the longitudinal sliding member (48) is rotatable by the tapered portion (20) and linked to a cam sleeve (36) that causes the longitudinal sliding member (48) to slide linearly.

10. The fountain pen (2) according to claim 1, wherein the third sealing unit (24) has at least one sealing material (54, 58) made of a rubber elastic material with passing portions (55, 57) extending inward.

11. The third seal unit (24) has two seal materials (54, 58) spaced apart in the longitudinal direction, each having a passing portion (55, 57) having a diameter that decreases in the direction opposite to the coupling (22), The fountain pen (2) according to claim 10.

12. The first seal unit (16) comprises a sleeve (62) and a complementaryly molded first seal body (66) that is linearly slidable to enter into the sleeve (62) and to exit the sleeve (62), The mechanism (26) has a longitudinal sliding member (48) configured to slide linearly within the housing (10), which is linked to the first seal (66). The third seal unit (24) has a passage portion (55, 57) through which at least one seal material (54, 58) made of a rubber elastic material extends, The third seal unit (24) has two seal materials (54, 58) spaced apart in the longitudinal direction, each having a passing portion (55, 57) having a diameter that decreases in the direction opposite to the coupling (22), The passage portion (55, 57) of the first sealing material (54) closer to the coupling (22) can be fluidly connected to the main tank (12), and the second sealing material (58) facing away from the coupling (22) can be fluidly connected to the writing tank (14). The fountain pen (2) according to claim 1, wherein the longitudinal sliding member (48) is hollow, and a fluid connection between the passage portion (57) and the writing tank (14) can be established.

13. The fountain pen (2) according to claim 1, wherein the tapered portion (20) is removable by bayonet connection.

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