Fountain pen with quick-filling joint

Abstract

The present invention provides a fountain pen with a quick filling joint, comprising: a nib unit; a housing, in which a main cartridge and a writing cartridge are formed; a rotatable cone, provided on the end of the fountain pen opposite to the nib unit; and a joint for fitting the housing on an ink supply device, wherein a first sealing unit is provided between the writing cartridge and the main cartridge, which is selectively openable and closable to fill the writing cartridge through the main cartridge; wherein a second sealing unit is provided between the writing cartridge and the nib unit, which is selectively openable and closable to supply ink to the nib unit; wherein a third sealing unit is provided between the main cartridge and the joint, which is openable and closable to fill at least the main cartridge; and the cone is connected to a mechanism designed to control the open state of at least the first sealing unit and the second sealing unit.

Description

Technical Field

[0001] This invention relates to a fountain pen with a quick-fill connector and a writing instrument system having a fountain pen and an ink supply device. Background Technology

[0002] High-quality writing instruments with a nib unit typically have a piston that dips into the ink reservoir and is filled by rotating a cone positioned opposite the nib unit. After filling, it is best to clean the nib unit. When using this type of fountain pen, such as on a commercial aircraft where the pressure at cruising altitude is significantly lower than on the ground, ink may leak from the nib unit due to the decompression of the piston. Summary of the Invention

[0003] The object of this invention is to provide a fountain pen that at least partially solves the above-mentioned drawbacks. At the same time, the fountain pen should be as easy to use as possible.

[0004] The above objective is achieved by a fountain pen having the features described in independent claim 1. Preferred embodiments and improvements are shown in the dependent claims and the following description.

[0005] This invention provides a fountain pen with a quick-fill connector, comprising: a nib unit; a housing having a main core and a writing core internally; a rotatable cone disposed on the end of the fountain pen facing away from the nib unit; and a connector for fitting the housing onto an ink supply device, wherein a first sealing unit is provided between the writing core and the main core, which can be selectively opened and closed to fill the writing core through the main core; wherein a second sealing unit is provided between the writing core and the nib unit, which can be selectively opened and closed to supply ink to the nib unit; wherein a third sealing unit is provided between the main core and the connector, which can be opened and closed to at least fill the main core; and the cone is connected to a mechanism designed to control the opening state of at least the first and second sealing units.

[0006] The pen tip unit should be understood as consisting of a pen tip and an ink supply unit. The pen tip is pushed into or inserted into the ink supply unit and is connected to the ink fluid in the flow capillary of the ink supply unit.

[0007] The casing provides the basic external shape of the writing instrument and can also be referred to as the outer shell. When writing, the user holds the casing or outer shell. A feature of this invention's fountain pen is that the refill is divided into a main refill and a writing refill. For example, the writing refill can be directly fluidly connected to the pen tip unit and supply ink to it.

[0008] The writing refill can be significantly smaller than a conventional piston refill. Furthermore, the writing refill is only used to temporarily supply ink to the nib unit. Therefore, the significantly smaller writing refill reduces the impact of low pressure compared to a traditional piston refill. By selectively establishing a fluid connection with the main refill, refilling can be done directly inside the fountain pen when it is empty.

[0009] The cone closes flush with the housing and, preferably, has a surface shape tangent to the housing. The user can grasp the housing and achieve the above functions by rotating the cone.

[0010] Therefore, the fountain pen of the present invention is designed to enter the writing state by closing the first and third sealing units and opening the second sealing unit. By opening the first sealing unit and closing the second and third sealing units, ink can be refilled from the main core to the writing core. At this time, the fountain pen should be slightly tilted so that the nib is facing down. By opening the first and third sealing units and closing the second sealing unit, ink can be supplied to the main core and the writing core through the connector. Therefore, the filling of the fountain pen is not achieved through the nib unit, but through the connector. During the above filling process, a specific sequence of opening and closing the sealing units can be provided to prevent ink leakage caused by possible pressure differences.

[0011] As an ink supply device, a filling system that supplies ink from a separate container can be used. It can be mechanical or electric. The ink supply device may have an air channel and an ink channel, each designed as a small tube. The air channel may be concentrically located within the ink channel. Releasing a certain amount of air through the air channel may help flush the ink from the refill, thus completely emptying the fountain pen. By subsequently drawing air from the air channel, ink can be drawn through the ink channel, causing the ink to flow from the container into the refill. In this case, preferably, the amount of air or ink is matched to the specific fountain pen to completely fill the refill. At this time, the fountain pen should be oriented with the nib facing upwards. When using the above-described filling system, any remaining ink in the fountain pen can be pre-transferred to the container before filling the fountain pen.

[0012] Particularly preferably, the writing refill is disposed between the nib unit and the main refill. Thus, the writing refill is disposed directly or almost directly on the nib unit. Only a second sealing unit exists between the nib unit and the writing refill; when the second sealing unit is opened, it is used to supply ink to the nib unit or for cleaning, and when closed, it is used to refill the writing refill.

[0013] Preferably, when the cone is in the housing, the cone is removable and the connector is hidden. Therefore, the connector is only visible and usable when the cone is removed. This not only improves the appearance of the fountain pen itself but also effectively protects the connector from dust contamination.

[0014] The first sealing unit may have a sleeve and a first sealing body with a complementary shape, the first sealing body being linearly movable into and out of the sleeve. Thus, the first sealing body can be brought into the interior of the sleeve and can form a radial seal with the sleeve, for example, through a surrounding sealing ring. The first sealing unit can be opened by removing the first sealing body from the sleeve. Conversely, the opening can be closed when the first sealing body is pushed into the sleeve. Therefore, only axial movement is required to form or open the seal. A funnel-shaped inlet end can be provided to particularly easily introduce the first sealing body into the sleeve.

[0015] Preferably, the mechanism includes a longitudinal displacement element connected to the first sealing body and designed to move linearly within the housing. Therefore, the first sealing unit can be operated simply by moving the longitudinal displacement element. The first sealing unit can also be operated from one end of the housing with the cone by being positioned along or parallel to the central axis.

[0016] In a preferred embodiment, the second sealing unit includes a second sealing body and a sealing surface with a through hole inside, wherein the second sealing body can be linearly pressed against the sealing surface to cover the through hole. Therefore, only one through hole can be provided between the writing refill and the pen tip unit, which can be selectively covered by the second sealing body. The second sealing body can be made of an elastic material and can be pressed axially against the through hole. This prevents ink from flowing from the writing refill into the pen tip unit.

[0017] Particularly preferably, the first and second sealing bodies are connected together by a spring that applies an axial force. This allows the movement of the first sealing body to be combined with the movement of the second sealing body. If the first sealing body moves axially along the direction of the pen tip unit, the pressure spring located between the second and first sealing bodies can cause the second sealing body to move along the direction of the through hole. After the second sealing body contacts the sealing surface, continuous movement of the first sealing body can be easily achieved, allowing it to be withdrawn from the sleeve after a period of time. In this case, only the spring is compressed, and the second sealing body is more firmly pressed against the through hole. This method greatly simplifies the mechanism.

[0018] In a particularly preferred embodiment, the first and second sealing units can be in a writing state, a refilling state, and a cleaning state relative to each other. In the writing state, the first sealing unit is closed and the second sealing unit is open; in the refilling state, the first sealing unit is open and the second sealing unit is closed; and in the cleaning state, both the first and second sealing units are open simultaneously. Preferably, the writing and refilling states can be achieved by rotating the cone to a specific position. The cleaning state is the state in which the fountain pen is designed to be rinsed with cleaning fluid. After the fountain pen and connector are placed in the cleaning device, the cleaning device guides the rinsing fluid for cleaning. Preferably, the cleaning device should not be adjusted directly by the cone, but rather specifically after the cone or similar material has been removed, through a hidden triggering device, for example, by using a suitable tool.

[0019] In another preferred embodiment, the longitudinal displacement element is connected to a cam sleeve, which can be rotated by means of a cone to cause linear displacement of the longitudinal displacement element. Thus, longitudinal displacement is achieved by the cam sleeve, which has a cam such as a movable cam. By rotating the cone, the cam sleeve can be rotated, causing the cam inside it to move axially. To prevent twisting on the cam-driven body, it is preferable to guide the cam sleeve longitudinally.

[0020] In a preferred embodiment, the third sealing unit includes at least one seal made of a rubber-elastic material, the seal having an internal channel. The third sealing unit may be penetrated by a tube for conveying ink and / or air, etc. The rubber-elastic material may be an elastomer or a material that at least has elastomeric properties at room temperature.

[0021] Preferably, the third sealing unit includes two seals spaced apart longitudinally, each seal having a channel whose diameter decreases in the direction away from the connector; wherein the channel of the first seal closer to the connector is fluidly connected to the main core, and the channel of the second seal away from the connector is fluidly connected to the writing core. Thus, two coaxial channels of different lengths can contact the two seals. While the first seal allows air to be delivered, the second seal can be used to deliver ink.

[0022] Preferably, the longitudinal displacement element is hollow and enables a fluid connection between the writing core and the second channel. Therefore, the longitudinal displacement element can deliver air, or, depending on the design, ink. This dual functionality makes good use of the limited internal installation space of the fountain pen.

[0023] Furthermore, the cone can be disassembled using a bayonet lock. It rotates smoothly and robustly, allowing for repeated operation. The bayonet lock is easy to install and remove.

[0024] The present invention also relates to a writing instrument system, including a fountain pen and an ink supply device, the ink supply device including an air channel and an ink channel, the ink channel being separated from the air channel and being guided to be sealed by a third sealing unit, wherein the ink supply device is designed to introduce air into the air channel and draw air out of the air channel; the ink channel is fluidly connected to an ink container. Attached Figure Description

[0025] Further features, advantages, and applications of the invention will become apparent from the following description of embodiments and drawings. All features described and / or illustrated constitute the subject matter of the invention on their own, in any combination, and independently of the components in the various claims or their reverse references. In the drawings, the same reference numerals denote the same or similar objects.

[0026] Figure 1 A side view of a fountain pen is shown.

[0027] Figures 2 to 4 The image shows different detailed views of a cross-section of a fountain pen.

[0028] Figures 5 to 11 The illustration shows the different details of the fountain pen in different states.

[0029] Figure 12 A fountain pen with an ink supply device and an ink container is shown. Detailed Implementation

[0030] Figure 1 A general overview of the fountain pen 2 is shown below, with subsequent accompanying drawings illustrating various details. The fountain pen 2 includes a nib unit 4, which consists of a nib 6 and an ink supply unit 8 for supporting the nib 6. The nib unit 4 is located on the front side of the housing 10.

[0031] The housing 10 also contains a main core 12 and a writing core 14. The writing core 14 is significantly smaller than the main core 12 and can be filled by the main core 12. For this purpose, a first sealing unit 16 is provided between the writing core 14 and the main core 12, which can selectively establish or interrupt the fluid connection between the main core 12 and the writing core 14. The writing core 14 is adjacent to the pen tip unit, and a second sealing unit 18 is provided between the writing core 14 and the pen tip unit 4. This allows for the selective establishment of a fluid connection between the writing core 14 and the pen tip unit 4.

[0032] A rotatable cone 20 is provided at the rear end of the housing 10. It can be detached from the housing 10. Additionally, a connector 22 is provided, through which the fountain pen 2 can be inserted into an ink supply device (not shown). A third sealing unit 24 is provided between the connector 22 and the main cartridge 12, which can be selectively opened and closed to fill the main cartridge 12. Thus, the cone 20 is connected to a mechanism 26, which is designed to control the open state at least in the first sealing unit 16 and the second sealing unit 18. Therefore, the fountain pen 2 can enter the writing state by rotating the cone 20, or enter the state where the writing core 14 is filled by the main cartridge 12.

[0033] Figure 2 The rear of the fountain pen 2 is shown. A cone 20 has a cone screw 28 screwed onto it via a mounting thread 30. A bayonet sleeve 32 is rotatably fixed to the cone 20 and engages in a cam 34 of a cam sleeve 36. It contacts the surface of a fin 38 of the refill tube 40, wherein the fin 38 is introduced into a radially arranged outer groove 42, allowing the refill tube 40 to move only linearly. A pressure spring 44 is provided on the side of the fin 38 facing away from the cam sleeve 36, which compresses the fin 38 along the direction of the cone 20, thereby compressing the refill tube 40. By rotating the cone 20, the bayonet sleeve 32 rotates accordingly, and the bayonet sleeve 32 is connected to the cam sleeve 36 via the cam 34, thus transmitting rotational motion. This causes the refill tube 40 to move axially, thereby moving the longitudinal displacement element 48.

[0034] For example, connector 24 may have a gap 50 between the pen refill sleeve and cam sleeve 36, through which the fountain pen 2 can be inserted into the ink supply device. By rotating the cone 20 in a predetermined direction, the bayonet sleeve 32 can be removed from the cam 34, allowing the cone 20 to be completely removed from the fountain pen 2 using the cone screw 28 and the bayonet sleeve 32. When the cone 20 is reattached to the bayonet sleeve 32, the tension spring 52 is pulled slightly to the left in the plane of the drawing, thereby applying a retaining force to the bayonet sleeve 32 or the cam 34. This preload provides the user with good tactile feedback indicating that the bayonet connection is properly engaged.

[0035] The third sealing unit 22 includes a first seal 54 made of a rubber-elastic material, which allows a conduit to be inserted into an insertion port 56. This conduit, for example, an ink channel 53, can extend through the entire first seal 54 via a channel 55 and, as shown by the dashed line, terminates on the side of the first seal 54 opposite to the insertion port 56. A second seal 58 is also present, which allows a conduit of a smaller diameter, such as an air channel 53, to pass through a channel 57. The conduit extends completely through the second seal 58 and, also as shown by the dashed line, terminates on the side of the second seal 58 opposite to the first seal 54. The first seal 54 allows the passage of a conduit for supplying ink. Ink can enter the gap between the two seals 54, 58 and flow to the main core 12 through an axially adjacent annular gap 60. Meanwhile, the longitudinal displacement element 48 is designed to be hollow and fluidly connected to a thinner conduit passing through the second seal 58. This is particularly useful for air transport, which will be described in more detail later.

[0036] Figure 3 The middle portion of the fountain pen 2, particularly the main refill, is shown. A longitudinal displacement element 48 passes through this portion and extends along the longitudinal axis of the fountain pen 2. A first sealing unit 16 can be seen on the left side of the attached plan. It comprises a sleeve 62 with an inner wall 64. A first sealing body 66 supports a sealing ring 68 on its outer periphery and can slide within the inner wall 64. When the sealing ring 68 is fully positioned within the inner wall 64, the fluid connection between the main refill 12 and the writing refill 14 is severed. Since the sealing body 66 is connected to the longitudinal displacement element 48, the first sealing unit 16 can be opened or closed by moving the displacement element 48. For completeness, refer to the additional sealing ring 70, which seals the outer surface of the sleeve 62 relative to the housing 10.

[0037] Figure 4 A cross-section facing the pen tip unit 4 is shown. It can be seen that the second sealing unit 16 includes a sealing surface 72, which has a through hole 74 inside. A second sealing body 76, composed of a rubber elastic material or the like, can be pressed against the sealing surface 72 by axial displacement. This closes the through hole 74, thereby preventing fluid connection between the writing core 14 and the pen tip unit 4. The second sealing body 76 is hinged by a spring 78 connected to the first sealing body 66. The cavity 80 of the longitudinal displacement element 48 is connected to the flow channel 82 of the first sealing body 66, specifically allowing air from the cavity 80 to enter the writing core 14 via the spring 78.

[0038] With the cone 20 disassembled, the fountain pen 2 with connector 22 can be fitted onto the ink supply device (not shown). In this case, the air channel can be connected to the second seal 58, and the ink channel can be connected to the first seal 54. The air channel can deliver air through the cavity 48 to the writing refill 14, allowing ink to enter the main refill 12 through the opened first sealing unit 16, and then exit from there through the annular channel 60 and the ink channel. Then, by drawing air from the cavity 48, ink can be drawn in via the ink channel, i.e., the first seal 54, causing the ink to flow through the main refill 12 and the writing refill 14 to reach the flow channel 82, thereby filling both refills 12 and 14.

[0039] To write with the fountain pen 2, the first sealing unit 16 needs to be closed and the second sealing unit 18 opened. This can be achieved by rotating the cone 20 to a specific rotational position. Figure 5 As shown, cam 34 and bayonet sleeve 32 are presented in a three-dimensional view. It can be seen that within cam sleeve 36, cam 34 is positioned in the retracted position of control cam 84. Consequently, the first seal 66 and the second seal 76 are positioned away from the pen tip unit 4. Bayonet sleeve 32 engages with bayonet 86, and cone 20 is fixedly mounted on the fountain pen.

[0040] Figure 6 The positions of the two seals 66 and 76 as described above are shown. By closing the second sealing unit 18 and opening the first sealing unit 16, ink can be refilled from the main core 12 into the writing core 14. This means that the two seals 66 and 76 must be moved to the left on the plane of the attached drawing. Figure 7 It is clearly shown that cam 34 moves to the left in control cam 84. Therefore, as Figure 8 As shown, ink can overflow from the main core 12 to the writing core 14, as indicated by the flow arrow.

[0041] The bayonet sleeve 32 can be configured to rotate only between writing and refilling states via a stop or other type of lock, wherein the two sealing units 16, 18 open only alternately. Preferably, by rotating the cone 20, the two sealing units 16, 18 are closed in the intermediate position, thereby ensuring that one of the two sealing units 16, 18 can be opened separately. Therefore, the cleaning state in which both sealing units 16, 18 are open simultaneously cannot be adjusted by the cone 20. To clean the fountain pen 2, after removing the cone 20, the tool 88 can be inserted into the cam sleeve 36 to move it in different directions. Figure 10 and 11As shown. Using tool 88, the seals 66 and 76 are positioned in the open position. To this end, both seals 66 move towards the cone 20, causing the first seal 66 to appear on the side of the sleeve 62 opposite to the pen tip unit 4. This establishes a fluid connection that extends completely through the fountain pen 2. The fountain pen 2 can be rinsed by providing cleaning fluid, for example, through the first seal 54.

[0042] at last, Figure 12 The diagram shows an ink supply device 90 located on an ink container 92, with a fountain pen 2 mounted on the ink supply device 90. The design is as follows: first, the fountain pen 2 presses the ink supply device 90 to guide air through an air channel, then draws in air through the air channel, causing ink to flow in from the ink channel connected to the ink container 92. The arrangement shown forms a writing instrument system 94.

[0043] Furthermore, it should be noted that "comprising" does not exclude other elements or steps, and "an" or "a" does not exclude multiple. Additionally, it should be noted that the features described with reference to one of the above embodiments can also be used in combination with other features of the other embodiments described above. Any reference numerals in the claims should not be construed as limiting.

[0044] Figure Labels

[0045] 2 fountain pens

[0046] 4 nib units

[0047] 6. Pen nib

[0048] 8. Ink supply unit

[0049] 10. Shell

[0050] 12 main cores

[0051] 14 Writing Core

[0052] 16 First sealing unit

[0053] 18 Second sealing unit

[0054] 20 cones

[0055] 22 connectors

[0056] 24 Third sealing unit

[0057] 26 institutions

[0058] 28 Tapered Screw

[0059] 30 mounting threads

[0060] 32 bayonet sleeve

[0061] 34 Cams

[0062] 36 Cam Sleeve

[0063] 38 winglets

[0064] 40 pen refill sleeve

[0065] 42 Grooves

[0066] 44 Compression Spring

[0067] 46 Inner part

[0068] 48. Longitudinal displacement element

[0069] 50 gap

[0070] 52. Tension Spring

[0071] 53 Ink Channel

[0072] 54 First sealing element

[0073] 55 channels

[0074] 56 Insertion Port

[0075] Channel 57

[0076] 58 Second seal

[0077] 59 Air passage

[0078] 60 gap

[0079] 62 sleeve

[0080] 64 Inner Wall

[0081] 66 First sealing body

[0082] 68 Sealing ring

[0083] 70 Sealing ring

[0084] 72 Sealing surface

[0085] 74 Through Holes

[0086] 76 Second sealing body

[0087] 78 Springs

[0088] 80 cavity

[0089] 82 flow channels

[0090] 84 Control Cam

[0091] 86 checkpoints

[0092] 88 Tools

[0093] 90 Ink supply unit

[0094] 92 Ink Containers

[0095] 94 Writing Instrument Systems

Claims

1. A fountain pen (2) having a quick-filling joint, comprising: - a nib unit (4); - a housing (10) internally forming a main cartridge (12) and a writing cartridge (14); - a rotatable cone (20) provided on the end of the fountain pen (2) facing away from the nib unit (4); and - a joint (22) for the housing (10) to be fitted on an ink supply device (90), wherein a first sealing unit (16) is provided between the writing cartridge (14) and the main cartridge (12) and is selectively openable and closable to fill the writing cartridge (14) through the main cartridge (12); wherein a second sealing unit (18) is provided between the writing cartridge (14) and the nib unit (4) and is selectively openable and closable to supply ink to the nib unit (4); wherein a third sealing unit is provided between the main cartridge (12) and the joint (22) and is openable and closable to at least fill the main cartridge (12); and, the cone (20) is connected to a mechanism (26) designed to control the open state of at least the first sealing unit (16) and the second sealing unit (18).

2. The fountain pen (2) according to claim 1, wherein, the writing cartridge (14) is provided between the nib unit (4) and the main cartridge (12).

3. The fountain pen (2) according to claim 1 or 2, wherein when the cone (20) is provided on the housing (10), the cone (20) is detachable and the joint (22) is hidden.

4. The fountain pen (2) according to claim 1, wherein the first sealing unit (16) has a sleeve (62) and a first sealing body (66) complementary in shape, which is linearly movable into and out of the sleeve (62).

5. The fountain pen (2) according to claim 4, wherein the mechanism (26) comprises a longitudinal displacement element (48) connected to the first sealing body (66) and designed to be linearly displaced within the housing (10).

6. The fountain pen (2) according to claim 1, wherein the second sealing unit (18) comprises a second sealing body (76) and a sealing face (72) internally provided with a through hole (74), the second sealing body (76) being linearly pressable on the sealing face (72) to cover the through hole (74).

7. The fountain pen (2) according to claim 1, wherein the first sealing unit (16) has a sleeve (62) and a first sealing body (66) complementary in shape, which is linearly movable into and out of the sleeve (62), wherein the second sealing unit (18) comprises a second sealing body (76) and a sealing face (72) internally provided with a through hole (74), the second sealing body (76) being linearly pressable on the sealing face (72) to cover the through hole (74), The first seal (66) and the second seal (76) are connected together by a spring (78) which exerts an axial spring force.

8. Fountain pen (2) according to claim 1, wherein The first sealing unit (16) and the second sealing unit (18) can be in a writing state, a refill state and a cleaning state relative to each other; In the writing state, the first sealing unit (16) is closed and the second sealing unit (18) is open; In the refill state, the first sealing unit (16) is open and the second sealing unit (18) is closed; and In the cleaning state, the first sealing unit (16) and the second sealing unit (18) are both open.

9. Fountain pen (2) according to claim 5, wherein The longitudinal displacement element (48) is connected to a cam sleeve (36) which can be rotated by means of the cone (20) to linearly displace the longitudinal displacement element (48).

10. Fountain pen (2) according to claim 1, wherein, The third sealing unit (24) comprises at least one sealing element (54, 58) made of rubber-elastic material, which is internally penetrated by a channel (55, 57).

11. Fountain pen (2) according to claim 10, wherein The third sealing unit (24) comprises two sealing elements (54, 58) which are spaced apart from each other in the longitudinal direction, each of which has a channel (55, 57) which decreases in diameter in the direction away from the joint (22); The channel (55, 57) of the first sealing element (54) near the joint (22) can be fluidically connected to the main cartridge (12) and the channel (55, 57) of the second sealing element (58) away from the joint (22) can be fluidically connected to the writing cartridge (14).

12. Fountain pen (2) according to claim 1, wherein, The first sealing unit (16) has a sleeve (62) and a first sealing body (66) which is complementary in shape and which can be linearly displaced into and out of the sleeve (62), wherein the mechanism (26) comprises a longitudinal displacement element (48) which is connected to the first sealing body (66) and is designed to be linearly displaced within the housing (10), The third sealing unit (24) comprises at least one sealing element (54, 58) made of rubber-elastic material, which is internally penetrated by a channel (55, 57), wherein the third sealing unit (24) comprises two sealing elements (54, 58) which are spaced apart from each other in the longitudinal direction, each of which has a channel (55, 57) which decreases in diameter in the direction away from the joint (22), the channel (55) of the first sealing element (54) near the joint (22) can be fluidically connected to the main cartridge (12) and the channel (55, 57) of the second sealing element (58) away from the joint (22) can be fluidically connected to the writing cartridge (14), wherein said longitudinal displacement element (48) is hollow and is able to establish a fluid connection of said writing core (14) and said passage (57) of said second sealing element (58).

13. Fountain pen (2) according to claim 1, wherein said cone (20) is detachable by means of a bayonet lock.

14. A writing instrument system (94), wherein a fountain pen (2) according to any one of the preceding claims and an ink supply device (90) comprising an air passage (59) and an ink passage (53) which is separated from the air passage (59) and can be guided sealed by the third sealing unit (24), wherein the ink supply device (90) is designed to introduce air into the air passage (59) and to suck air out of the air passage (59); the ink passage (53) can be fluidically connected to an ink container (92).

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