Pen nibs and fountain pens

Abstract

This suppresses ink leakage from the air passage in the pen nib. [Solution] The pen nib 30 is a pen nib for a fountain pen 10 comprising an ink passage 32 through which ink flows from the ink reservoir 16 to the nib 22 when writing, an air passage 34 through which air flows from the outside to the ink reservoir 16, an outer core 40 having a through hole 42 extending in the axial direction da, and an inner core 50 disposed within the through hole 42, wherein the outer core 40 has a first connecting the through hole 42 and the outer peripheral surface 46 of the outer core 40 The inner core 50 has a slit 44, a second slit 52 extending in the axial direction da and communicating with the first slit 44, a rear groove 54 extending in the axial direction da, a first wall portion 65 positioned in front of the rear groove 54, and a second wall portion 66 positioned in front of the first wall portion 65. The ink passage 32 includes the first slit 44 and the second slit 52, and the air passage 34 includes the rear groove 54, the first wall portion 65, and the second wall portion 66.

Description

Technical Field

[0004] , , ,

[0001] The present invention relates to a pen refill and a fountain pen.

Background Art

[0002] A fountain pen generally includes a barrel, a writing member attached to the front end of the barrel, and an ink storage portion disposed in the barrel for storing ink. The writing member includes a pen refill and a pen tip. The writing member has a pen tip for forming a writing trace and a pen refill for supporting the pen tip. The pen refill has an ink groove for communicating the ink storage portion with the pen tip. In such a fountain pen, due to the capillary force of the ink in the ink groove, the ink stored in the ink storage portion is sent to the pen tip. When writing, as the ink in the ink storage portion decreases and the pressure in the ink storage portion decreases, the capillary force of the ink in the ink groove alone cannot send the ink to the pen tip. Therefore, by providing an air passage different from the ink groove in the pen refill, external air is taken into the ink storage portion through this air passage during writing, so that the pressure in the ink storage portion does not decrease.

[0003] When sucking ink into the ink storage portion, the ink in the ink bottle is sucked into the ink storage portion using the air passage. In conventional fountain pens, since the opening of the air passage is immersed in the ink in the ink bottle, it is necessary to immerse almost the entire portion exposed from the barrel of the writing member in the ink. At this time, ink may also adhere to the barrel, and it has been time-consuming to wipe the barrel after sucking the ink. To address such problems, a fountain pen adopting a double pen refill structure including an outer refill having an axially extending through hole and an inner refill disposed inside the outer refill is known (see Patent Document 1). In such a fountain pen, since the opening of the air passage is located near the tip of the pen tip, only the vicinity of the tip of the writing member can be immersed in the ink in the ink bottle to suck the ink into the ink storage portion.

[0004] In fountain pens employing a double-nib structure, the opening of the air passage faces forward in the axial direction, which creates a problem where ink is prone to squirting out of the air passage when the pen is subjected to impact. This problem is particularly pronounced when the fountain pen is dropped with the nib pointing downwards. To address this problem, Patent Document 1 describes a method of suppressing ink squirting out of the air passage by providing a constriction within the air passage. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2017-213767 [Overview of the project] [Problems that the invention aims to solve]

[0006] In fountain pens employing such a double-nib structure, there is a need to further suppress ink leakage from the air passage.

[0007] This invention has been made with these points in mind, and aims to provide a pen nib and fountain pen that can suppress ink leakage from the air passage. [Means for solving the problem]

[0008] The pen nib according to the present invention is [1] The ink passage through which ink flows from the ink reservoir to the pen tip when writing, An air passage through which air flows from the outside toward the ink storage section, An outer core having a through hole extending in the axial direction, A fountain pen nib comprising an inner core disposed within the aforementioned through hole, The outer core has a first slit that connects the through hole and the outer surface of the outer core, The aforementioned inner core is It has a second slit that extends in the axial direction and communicates with the first slit, a rear groove that extends in the axial direction, a first wall portion positioned in front of the rear groove, and a second wall portion positioned in front of the first wall portion. The ink passage includes the first slit and the second slit, The air passage is a pen tip, including the rear groove, the first wall portion, and the second wall portion.

[0009] The pen nib according to the present invention is [2] A circumferential groove extending circumferentially along the first wall portion, The system further comprises a front groove that communicates with the circumferential groove and extends axially, and is positioned offset circumferentially from the rear groove, The second wall portion is the pen tip described in [1], which is positioned in front of the front groove.

[0010] The pen nib according to the present invention is [3] Other circumferential grooves extending circumferentially along the second wall, It further comprises another front groove that extends axially and communicates with the other circumferential groove, and is positioned offset circumferentially from the front groove, One end of the circumferential groove communicates with the rear groove, and the other end of the circumferential groove communicates with the front groove. The pen tip according to [2], wherein one end of the other circumferential groove in the circumferential direction communicates with the front groove, and the other end of the other circumferential groove in the circumferential direction communicates with the other front groove.

[0011] The pen nib according to the present invention is [4] Other circumferential grooves extending circumferentially along the second wall, It further comprises another front groove that extends axially and communicates with the other circumferential groove, and is positioned offset circumferentially from the front groove, One end of the circumferential groove communicates with the rear groove, and the other end of the circumferential groove communicates with the front groove. The end on the other side in the circumferential direction of the other circumferential groove communicates with the front groove, and the end on the one side in the circumferential direction of the other circumferential groove communicates with the other front groove. The pen refill according to [2].

[0012] The pen refill according to the present invention is [5] The pen refill according to any one of [1] to [4], further comprising a throttle portion disposed between the first wall portion and the second wall portion.

[0013] The pen refill according to the present invention is [6] The pen refill according to [1], wherein the second wall portion extends in a spiral shape.

[0014] The fountain pen according to the present invention is [7] A fountain pen comprising the pen refill according to any one of [1] to [6].[[]END]]

Effect of the Invention

[0015] According to the present invention, it is possible to provide a pen refill and a fountain pen that can suppress the ink from spilling out of the air passage.

Brief Description of the Drawings

[0016] [Figure 1] FIG. 1 is a diagram for explaining a first embodiment according to the present invention, and is an external view showing an example of a fountain pen provided with a pen refill. [Figure 2] FIG. 2 is a view of the front portion of the fountain pen of FIG. 1 as seen along the arrow with II in FIG. 1 attached. [Figure 3] FIG. 3 is a longitudinal sectional view showing an enlarged front portion of the fountain pen of FIG. 1. [Figure 4] FIG. 4 is a longitudinal sectional view showing an enlarged front portion of the fountain pen of FIG. 1. [Figure 5] FIG. 5 is a longitudinal sectional view showing a pen refill. [Figure 6] FIG. 6 is a cross-sectional view corresponding to the line VI-VI of FIG. 5. [Figure 7]Figure 7 is a cross-sectional view corresponding to line VII-VII in Figure 5. [Figure 8] Figure 8 is a cross-sectional view corresponding to line VIII-VIII in Figure 5. [Figure 9] Figure 9 is a perspective view showing the inner core of the pen nib. [Figure 10] Figure 10 shows the inner core as viewed from the radial outside. [Figure 11] Figure 11 shows the inner core as viewed along the arrow labeled XI in Figure 10. [Figure 12] Figure 12 is a diagram illustrating a second embodiment according to the present invention, and is a perspective view showing the inner core. [Figure 13] Figure 13 shows the inner core as viewed from the radial outside. [Figure 14] Figure 14 shows the inner core as seen along the arrow labeled XIV in Figure 13. [Figure 15] Figure 15 shows the inner core as seen along the arrow labeled XV in Figure 14. [Figure 16] Figure 16 is a cross-sectional view corresponding to the line XVI-XVI in Figure 14. [Figure 17] Figure 17 is a cross-sectional view corresponding to the line XVII-XVII in Figure 14. [Figure 18] Figure 18 is a cross-sectional view corresponding to line XVIII-XVIII in Figure 14. [Figure 19] Figure 19 is a diagram illustrating a third embodiment according to the present invention, and is a perspective view showing the inner core. [Figure 20] Figure 20 shows the inner core as viewed from the radial outside. [Figure 21] Figure 21 shows the inner core as seen along the arrow labeled XXI in Figure 20. [Figure 22] Figure 22 is a cross-sectional view corresponding to the line XXII-XXII in Figure 21. [Figure 23] Figure 23 is a cross-sectional view corresponding to the line XXIII-XXIII in Figure 21. [Figure 24]Figure 24 shows a modified example of the inner core and corresponds to Figure 20. [Figure 25] Figure 25 is a diagram illustrating a fourth embodiment according to the present invention, and is a perspective view showing the inner core. [Figure 26] Figure 26 shows the inner core as viewed from the radial outside. [Figure 27] Figure 27 shows the inner core as seen along the arrow labeled XXVII in Figure 26. [Figure 28] Figure 28 is a cross-sectional view corresponding to the line XXVIII-XXVIII in Figure 27. [Figure 29] Figure 29 is a cross-sectional view corresponding to the line XXIX-XXIX in Figure 27. [Figure 30] Figure 30 is a cross-sectional view corresponding to the line XXX-XXX in Figure 27. [Figure 31] Figure 31 is a cross-sectional view corresponding to the line XXXI-XXXI in Figure 27. [Figure 32] Figure 32 is a diagram illustrating a fifth embodiment according to the present invention, and is a perspective view showing the inner core. [Figure 33] Figure 33 shows the inner core as viewed from the radial outside. [Figure 34] Figure 34 shows the inner core as seen along the arrow labeled XXXIV in Figure 33. [Figure 35] Figure 35 shows the inner core as seen along the arrow labeled XXXV in Figure 34. [Figure 36] Figure 36 is a cross-sectional view corresponding to the line XXXVI-XXXVI in Figure 34. [Figure 37] Figure 37 is a cross-sectional view corresponding to the line XXXVII-XXXVII in Figure 34. [Figure 38] Figure 38 is a cross-sectional view corresponding to the line XXXVIII-XXXVIII in Figure 34. [Figure 39] Figure 39 is a diagram illustrating a sixth embodiment of the present invention, and is a perspective view showing the inner core. [Figure 40] Figure 40 shows the inner core as viewed from the radial outside. [Modes for carrying out the invention]

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that, for the sake of illustration and ease of understanding, the scale and aspect ratios of the drawings accompanying this specification have been appropriately altered and exaggerated from those of the actual objects.

[0018] Furthermore, terms used in this specification to specify shapes, geometric conditions, and their degrees, such as "parallel," "orthogonal," and "identical," as well as values ​​for length and angle, shall not be strictly interpreted, but shall be interpreted to include a range that allows for the expectation of similar functionality.

[0019] In this specification, the direction in which the central axis A of the fountain pen 10 extends (longitudinal direction, vertical direction in the longitudinal section) is defined as the axial direction da, the direction perpendicular to the axial direction da is defined as the radial direction, and the direction along the circumference around the central axis A is defined as the circumferential direction dc. Furthermore, along the axial direction da, the side that approaches the writing surface such as paper when writing (the lower side in the longitudinal section) is defined as the front, and the side that moves away from the writing surface (the upper side in the longitudinal section) is defined as the rear. Furthermore, along the radial direction, the side that approaches the central axis A is defined as the inside, and the side that moves away from the central axis A is defined as the outside.

[0020] First Embodiment Figure 1 is a diagram illustrating a first embodiment according to the present invention, and is an external view showing an example of a fountain pen 10 equipped with a nib 30. Figure 2 is a view of the front portion of the fountain pen 10 along the arrow labeled II in Figure 1. Figure 3 is a magnified longitudinal cross-sectional view showing the front portion of the fountain pen 10.

[0021] The fountain pen 10 comprises a barrel 12, a connecting member 14, an ink reservoir 16, and a writing member 20. The barrel 12 houses the ink reservoir 16 and is intended to be held by the user's fingers when writing with the fountain pen 10. The barrel 12 extends axially da along the central axis A of the fountain pen 10. Therefore, the central axis of the barrel 12 coincides with the central axis A of the fountain pen 10. In this embodiment, the barrel 12 has a substantially cylindrical shape. The barrel 12 may be composed of a single part or of multiple parts.

[0022] The connecting member 14 is a member that connects the barrel 12 and the writing member 20 (see Figure 3). The connecting member 14 has a substantially cylindrical shape. The central axis of the connecting member 14 coincides with the central axis A of the fountain pen 10. The writing member 20 is attached to the barrel 12 by attaching the writing member 20 to the connecting member 14, and the connecting member 14 being attached to the barrel 12. The method of attaching the writing member 20 to the connecting member 14 and the method of attaching the connecting member 14 to the 20 are not particularly limited. For example, the writing member 20 may be attached to the connecting member 14 by press-fitting. Alternatively, for example, the connecting member 14 may be attached to the barrel 12 by screwing the male threaded portion on the outer surface of the connecting member 14 into the female threaded portion on the inner surface of the barrel 12. The connecting member 14 may be omitted. In this case, the writing member 20 may be attached directly to the barrel 12.

[0023] The ink storage section 16 has the function of storing ink. In this embodiment, the ink storage section 16 may be a converter or a cartridge. The converter has the function of creating a negative pressure inside the ink storage section 16 and drawing up ink from the outside through an air passage 34, which will be described later. The ink storage section 16 is attached to the rear end of the connecting member 14. For example, the ink storage section 16 may be attached to the connecting member 14 by press-fitting the rear end of the connecting member 14 into the front end of the ink storage section 16.

[0024] The writing component 20 has a pen tip 22 and a pen feed 30. The pen tip 22 is a component that contacts a writing surface such as paper and forms a line on the writing surface. The pen tip 22 has a pen point 24 and a slit 26. The pen point 24 is located at the tip of the pen tip 22 and is the part that contacts the writing surface when writing. The slit 26 is a slit that extends linearly backward from the pen tip 22. Ink that flows from the ink passage 32 of the pen feed 30 (described later) to the pen tip 22 is supplied to the pen point 24 through the slit 26.

[0025] The nib 30 of this embodiment will be described with reference to Figures 3 to 11. Figure 3 is a magnified longitudinal cross-sectional view showing the front portion of the fountain pen 10. Figure 4 is a magnified longitudinal cross-sectional view showing the front portion of the fountain pen 10. Figure 5 is a longitudinal cross-sectional view showing the nib 30. Figure 6 is a transverse cross-sectional view corresponding to line VI-VI in Figure 5. Figure 7 is a transverse cross-sectional view corresponding to line VII-VII in Figure 5. Figure 8 is a transverse cross-sectional view corresponding to line VIII-VIII in Figure 5. Figure 9 is a perspective view showing the inner core 50 of the nib 30. Figure 10 is a diagram showing the inner core 50 viewed from the radial outside. Figure 11 is a diagram showing the inner core 50 viewed along the arrow labeled XI in Figure 10. Note that in Figure 3, each component of the fountain pen 10 is hatched, and in Figure 4, the ink 80 inside the fountain pen 10 is hatched.

[0026] The pen nib 30 supports the pen tip 22 and is a component that allows the ink 80 in the ink reservoir 16 to flow to the pen tip 22. The pen tip 22 is attached to the outer surface of the pen nib 30. The writing member 20 is attached to the connecting member 14 by attaching the rear end of the pen nib 30 to the front end of the connecting member 14. The pen nib 30 has an ink passage 32 and an air passage 34. The ink passage 32 is a passage through which the ink 80 flows from the ink reservoir 16 to the pen tip 22 when writing. The air passage 34 is a passage through which air flows from the outside to the ink reservoir 16.

[0027] The pen tip 30 of this embodiment has an outer core 40 and an inner core 50. The outer core 40 has a through hole 42 extending in the axial direction da. The inner core 50 is disposed within the through hole 42 of the outer core 40 and is a rod-shaped member as a whole. The entire inner core 50 may be disposed within the through hole 42, or only a part of the inner core 50 may be disposed within the through hole 42.

[0028] The outer core 40 further has a first slit 44 and comb grooves 48. The first slit 44 is a passage that connects the through hole 42 and the outer circumferential surface 46 of the outer core 40. The first slit 44 extends linearly along the axial direction da. The first slit 44 communicates with the slit 26 of the pen tip 22. The comb grooves 48 are a plurality of grooves that extend in the circumferential direction and are arranged along the axial direction da. The comb grooves 48 communicate with the first slit 44 via the outer circumferential surface 46. When the air in the ink reservoir 16 expands due to changes in temperature and / or atmospheric pressure, the amount of ink that has expanded may be pushed out of the ink reservoir 16 into the ink passage 32. The comb grooves 48 have the function of preventing ink from dripping from the fountain pen 10 by holding the ink that has been pushed out into the ink passage 32 in the comb grooves 48 via the outer circumferential surface 46 from the first slit 44.

[0029] The inner core 50 has a second slit 52, a rear groove 54, a first wall portion 65, and a second wall portion 66. The second slit 52 is a groove formed on the outer circumferential surface of the inner core 50. The second slit 52 extends in the axial direction da and communicates with the first slit 44 of the outer core 40. The rear end of the second slit 52 also communicates with the ink storage portion 16. Therefore, the ink storage portion 16 and the first slit 44 communicate with each other via the second slit 52. In this embodiment, the ink passage 32 includes the first slit 44 and the second slit 52. The ink 80 stored in the ink storage portion 16 can flow towards the pen point 24 through the second slit 52, the first slit 44, and the cutout 26.

[0030] The air passage 34 includes a rear groove 54, a first wall portion 65, and a second wall portion 66. The rear groove 54 extends linearly along the axial direction da. The rear end of the rear groove 54 communicates with the ink storage portion 16. The rear groove 54 is positioned offset in the circumferential direction dc relative to the second slit 52. In particular, the rear groove 54 may be positioned offset by 180 degrees in the circumferential direction dc relative to the second slit 52.

[0031] The first wall portion 65 is positioned in front of the rear groove 54. The first wall portion 65 has the function of obstructing the flow of ink 80 toward the front within the rear groove 54 and guiding the ink 80 toward the second wall portion 66. In this embodiment, the first wall portion 65 extends perpendicular to the axial direction da. That is, the first wall portion 65 is a wall portion that extends in the circumferential direction dc and the radial direction. However, it is not limited to this, and the first wall portion 65 may extend in a direction inclined with respect to the axial direction da and the circumferential direction dc. For example, the first wall portion 65 may extend in a direction inclined with respect to the axial direction da and the circumferential direction dc so that it moves away from the rear groove 54 as it moves toward the front. In this case, the angle between the first wall portion 65 and the circumferential direction dc may be 45 degrees or less. The angle between the first wall portion 65 and the circumferential direction dc is the smaller of the two angles formed between the direction in which the first wall portion 65 extends and the circumferential direction dc.

[0032] A first circumferential groove 56 is formed along the first wall portion 65. In this embodiment, the first circumferential groove 56 extends perpendicular to the axial direction da. That is, the first circumferential groove 56 extends in the circumferential direction dc. If the first wall portion 65 extends in a direction inclined with respect to the axial direction da and the circumferential direction dc, the first circumferential groove 56 may also extend in a direction inclined with respect to the axial direction da and the circumferential direction dc.

[0033] The inner core 50 is positioned offset in the circumferential direction dc relative to the rear groove 54 and has a first plane 70 that extends parallel to the central axis A. In this embodiment, the first plane 70 is positioned offset by 180 degrees in the circumferential direction dc relative to the rear groove 54.

[0034] In this embodiment, the inner core 50 has a front groove (first front groove) 60. The first front groove 60 may be provided along the first plane 70. The rear end of the first front groove 60 communicates with the first circumferential groove 56, and the front end of the first front groove 60 communicates with the second circumferential groove 57, which will be described later. In other words, the first front groove 60 connects the first circumferential groove 56 and the second circumferential groove 57. The first front groove 60 extends linearly along the axial direction da.

[0035] The second wall portion 66 is positioned in front of the first wall portion 65. In this embodiment, the second wall portion 66 is positioned in front of the first front groove 60. In particular, the second wall portion 66 is positioned at the front end of the first front groove 60. The second wall portion 66 has the function of obstructing the flow of ink 80 toward the front within the first front groove 60 and guiding the ink 80 to the second front groove 61, which will be described later. In this embodiment, the second wall portion 66 extends perpendicular to the axial direction da. That is, the second wall portion 66 is a wall portion that extends in the circumferential direction dc and the radial direction. However, it is not limited to this, and the second wall portion 66 may extend in a direction inclined with respect to the axial direction da and the circumferential direction dc. For example, the second wall portion 66 may extend in a direction inclined with respect to the axial direction da and the circumferential direction dc such that it moves away from the first front groove 60 as it moves toward the front. In this case, the angle between the second wall portion 66 and the circumferential direction dc may be 45 degrees or less. The angle between the second wall portion 66 and the circumferential direction dc is the smaller of the two angles formed between the direction in which the second wall portion 66 extends and the circumferential direction dc.

[0036] A second circumferential groove 57 is formed along the second wall portion 66. In this embodiment, the second circumferential groove 57 extends perpendicular to the axial direction da. That is, the second circumferential groove 57 extends in the circumferential direction dc. If the second wall portion 66 extends in a direction inclined with respect to the axial direction da and the circumferential direction dc, the second circumferential groove 57 may also extend in a direction inclined with respect to the axial direction da and the circumferential direction dc.

[0037] The inner core 50 has a second plane 71 that is positioned offset in the circumferential direction dc relative to the first plane 70 and extends parallel to the central axis A. In this embodiment, the second plane 71 is positioned offset by 180 degrees in the circumferential direction dc relative to the first plane 70.

[0038] In this embodiment, the inner core 50 has another front groove (second front groove) 61. The second front groove 61 may be provided along the second plane 71. The rear end of the second front groove 61 communicates with the second circumferential groove 57, and the front end of the second front groove 61 opens forward. In other words, the second front groove 61 communicates the second circumferential groove 57 with the front end opening of the ink passage 32. The second front groove 61 extends linearly along the axial direction da.

[0039] In this embodiment, one end of the first circumferential groove 56 in the circumferential direction dc communicates with the rear groove 54, and the other end of the first circumferential groove 56 in the circumferential direction dc communicates with the first front groove 60. Also, one end of the second circumferential groove 57 in the circumferential direction dc communicates with the first front groove 60, and the other end of the second circumferential groove 57 in the circumferential direction dc communicates with the second front groove 61. Ink 80 flowing from the ink storage section 16 to the front end opening through the air passage 34 flows from one side to the other in the circumferential direction dc through the first circumferential groove 56, and flows from one side to the other in the circumferential direction dc through the second circumferential groove 57. That is, ink 80 flowing from the ink storage section 16 to the front end opening through the air passage 34 flows in the same direction in the circumferential direction dc through the first circumferential groove 56 and the second circumferential groove 57.

[0040] When drawing ink 80 into the ink reservoir 16, the fountain pen 10 is held so that the writing member 20 faces downwards, and the writing member 20 is immersed in the ink in the ink bottle. At this time, the front end opening of the air passage 34 is immersed in the ink. In this state, the ink reservoir (converter) 16 is operated to create a negative pressure inside the ink reservoir 16, thereby drawing the ink from the ink bottle into the ink reservoir 16 via the air passage 34. Specifically, the ink in the ink bottle passes through the second front groove 61, the second circumferential groove 57, the first front groove 60, the first circumferential groove 56, and the rear groove 54 in that order, towards the ink reservoir 16. At this time, since the front end opening of the air passage 34 is located near the tip of the nib (pen point 24), only the area near the tip of the writing member 20 is immersed in the ink in the ink bottle, and the ink can be drawn into the ink reservoir 16. Therefore, it is possible to suppress ink from adhering to the barrel 12.

[0041] When writing with the fountain pen 10, the pen point 24 of the nib 22 is brought into contact with the writing surface, such as paper, and moved along the writing surface. This causes the ink held in the pen point 24 to adhere to the writing surface, forming a line. When the ink in the nib 22 is consumed, ink is supplied from the ink reservoir 16 to the nib 22 through the ink passage 32. This ink supply is mainly achieved by the action of capillary force in the ink passage 32.

[0042] When the fountain pen 10 is subjected to an impact, particularly a forward impact such as when it falls with the nib 22 pointing downwards, the ink 80 can move forward through the air passage 34. In the fountain pen 10 of this embodiment, the ink 80 that has moved forward through the rear groove 54 first collides with the first wall portion 65. This reduces the momentum of the forward flow of the ink 80. After that, the ink 80 flows along the first wall portion 65 through the first circumferential groove 56 and heads toward the first front groove 60. The ink 80 that has entered the first front groove 60 moves forward within the first front groove 60 and collides with the second wall portion 66. This further reduces the momentum of the forward flow of the ink 80. Therefore, it is possible to effectively suppress the ink 80 from splashing out of the front end opening of the air passage 34.

[0043] The pen nib 30 of this embodiment is a pen nib 30 for a fountain pen 10, comprising an ink passage 32 through which ink flows from the ink reservoir 16 to the nib 22 when writing, an air passage 34 through which air flows from the outside to the ink reservoir 16, an outer core 40 having a through hole 42 extending in the axial direction da, and an inner core 50 disposed within the through hole 42, wherein the outer core 40 has a first connecting the through hole 42 and the outer peripheral surface 46 of the outer core 40 The inner core 50 has a slit 44, a second slit 52 extending in the axial direction da and communicating with the first slit 44, a rear groove 54 extending in the axial direction da, a first wall portion 65 positioned in front of the rear groove 54, and a second wall portion 66 positioned in front of the first wall portion 65. The ink passage 32 includes the first slit 44 and the second slit 52, and the air passage 34 includes the rear groove 54, the first wall portion 65, and the second wall portion 66.

[0044] The 10th embodiment of this model includes the pen tip 30 described above.

[0045] The pen tip 30 of this embodiment further comprises a circumferential groove 56 extending in the circumferential direction dc along the first wall portion 65, and a front groove 60 that communicates with the circumferential groove 56 and extends in the axial direction da, and is positioned offset in the circumferential direction dc relative to the rear groove 54, with the second wall portion 66 positioned in front of the front groove 60.

[0046] The pen tip 30 of this embodiment further comprises another circumferential groove 57 extending in the circumferential direction dc along the second wall portion 66, and another front groove 61 that communicates with the other circumferential groove 57 and extends in the axial direction da, and is positioned offset in the circumferential direction dc relative to the front groove 60. One end of the circumferential groove 56 in the circumferential direction dc communicates with the rear groove 54, the other end of the circumferential groove 56 in the circumferential direction dc communicates with the front groove 60, one end of the other circumferential groove 57 in the circumferential direction dc communicates with the front groove 60, and the other end of the other circumferential groove 57 in the circumferential direction dc communicates with the other front groove 61.

[0047] When the fountain pen 10 is subjected to an impact, especially when it is subjected to a forward impact such as when it falls with the nib 22 pointing downwards, the ink 80 may move forward through the air passage 34, and there is a risk that the ink may squirt out to the outside from the front end opening of the air passage 34. With the nib 30 and fountain pen 10 of this embodiment, the ink 80 that has moved forward through the rear groove 54 collides with the first wall portion 65 and then with the second wall portion 66. This significantly reduces the force of the forward flow of the ink 80. Therefore, it is possible to effectively suppress the ink 80 from squirting out to the outside from the front end opening of the air passage 34.

[0048] Second Embodiment A second embodiment of the present invention will be described with reference to Figures 12 to 18. In the following description and the drawings used therein, parts that can be configured in the same way as in the first embodiment will be given the same reference numerals as those used in the description of the first embodiment, and redundant explanations will be omitted.

[0049] Figure 12 is a diagram illustrating a second embodiment according to the present invention, and is a perspective view showing the inner core 50. Figure 13 is a diagram showing the inner core 50 viewed from the radial outside. Figure 14 is a diagram showing the inner core 50 viewed along the arrow labeled XIV in Figure 13. Figure 15 is a diagram showing the inner core 50 viewed along the arrow labeled XV in Figure 15. Figure 16 is a cross-sectional view corresponding to the line XVI-XVI in Figure 14. Figure 17 is a cross-sectional view corresponding to the line XVII-XVII in Figure 14. Figure 18 is a cross-sectional view corresponding to the line XVIII-XVIII in Figure 14.

[0050] In this embodiment, one end of the first circumferential groove 56 in the circumferential direction dc communicates with the rear groove 54, and the other end of the first circumferential groove 56 in the circumferential direction dc communicates with the first front groove 60. Also, the other end of the second circumferential groove 57 in the circumferential direction dc communicates with the first front groove 60, and one end of the second circumferential groove 57 in the circumferential direction dc communicates with the second front groove 61. Ink 80 flowing from the ink storage section 16 to the front end opening in the air passage 34 flows from one side to the other in the circumferential direction dc in the first circumferential groove 56, and flows from the other side to the one side in the circumferential direction dc in the second circumferential groove 57. That is, ink 80 flowing from the ink storage section 16 to the front end opening in the air passage 34 flows in opposite directions in the circumferential direction dc in the first circumferential groove 56 and the second circumferential groove 57.

[0051] The pen tip 30 of this embodiment further comprises another circumferential groove 57 extending in the circumferential direction dc along the second wall portion 66, and another front groove 61 that communicates with the other circumferential groove 57 and extends in the axial direction da, and is positioned offset in the circumferential direction dc relative to the front groove 60. One end of the circumferential groove 56 in the circumferential direction dc communicates with the rear groove 54, the other end of the circumferential groove 56 in the circumferential direction dc communicates with the front groove 60, the other end of the circumferential groove 57 in the circumferential direction dc communicates with the front groove 60, and one end of the circumferential groove 57 in the circumferential direction dc communicates with the other front groove 61.

[0052] Even with this type of pen tip 30, the ink 80 that moves forward through the rear groove 54 collides with the first wall 65 and then with the second wall 66. This significantly reduces the momentum of the forward flow of ink 80. Therefore, it is possible to effectively suppress ink 80 from splashing out of the front end opening of the air passage 34.

[0053] Third Embodiment A third embodiment of the present invention and its modifications will be described with reference to Figures 19 to 24. In the following description and the drawings used therein, parts that can be configured in the same way as in the first and second embodiments will be given the same reference numerals as those used in the descriptions of the first and second embodiments, and redundant explanations will be omitted.

[0054] Figure 19 is a diagram illustrating a third embodiment according to the present invention, and is a perspective view showing the inner core 50. Figure 20 is a diagram showing the inner core 50 viewed from the radial outside. Figure 21 is a diagram showing the inner core 50 viewed along the arrow labeled XXI in Figure 20. Figure 22 is a cross-sectional view corresponding to the line XXII-XXII in Figure 21. Figure 23 is a cross-sectional view corresponding to the line XXIII-XXIII in Figure 21.

[0055] In this embodiment, as shown in Figures 19 to 21, the first front groove 60, the second front groove 61, and the second circumferential groove 57 are provided on the same first plane 70. This allows the first front groove 60, the second front groove 61, and the second circumferential groove 57 to be formed with a simple structure.

[0056] The inner core 50 of this embodiment further comprises a third wall portion 67. The third wall portion 67 is positioned in front of the second wall portion 66. In this embodiment, the third wall portion 67 is positioned in front of the second front groove 61. In particular, the third wall portion 67 is positioned at the front end of the second front groove 61. The third wall portion 67 has the function of obstructing the flow of ink 80 toward the front within the second front groove 61 and guiding the ink 80 to the third front groove 62, which will be described later. In this embodiment, the third wall portion 67 extends perpendicular to the axial direction da. That is, the third wall portion 67 is a wall portion that extends in the circumferential direction dc and the radial direction. However, it is not limited to this, and the third wall portion 67 may extend in a direction inclined with respect to the axial direction da and the circumferential direction dc. For example, the third wall portion 67 may extend in a direction inclined with respect to the axial direction da and the circumferential direction dc such that it moves away from the second front groove 61 as it moves toward the front. In this case, the angle between the third wall portion 67 and the circumferential direction dc may be 45 degrees or less. The angle between the third wall portion 67 and the circumferential direction dc is the smaller of the two angles formed between the direction in which the third wall portion 67 extends and the circumferential direction dc.

[0057] A third circumferential groove 58 is formed along the third wall portion 67. In this embodiment, the third circumferential groove 58 extends perpendicular to the axial direction da. That is, the third circumferential groove 58 extends in the circumferential direction dc. If the third wall portion 67 extends in a direction inclined with respect to the axial direction da and the circumferential direction dc, the third circumferential groove 58 may also extend in a direction inclined with respect to the axial direction da and the circumferential direction dc.

[0058] The inner core 50 has a second plane 71 that is positioned offset in the circumferential direction dc relative to the first plane 70 and extends parallel to the central axis A. In this embodiment, the second plane 71 is positioned offset by 180 degrees in the circumferential direction dc relative to the first plane 70.

[0059] In this embodiment, the inner core 50 has a third front groove 62. The third front groove 62 may be provided along the second plane 71. The rear end of the third front groove 62 communicates with the third circumferential groove 58, and the front end of the third front groove 62 opens forward. In other words, the third front groove 62 communicates the third circumferential groove 58 with the front end opening of the ink passage 32. The third front groove 62 extends linearly along the axial direction da.

[0060] In this embodiment, one end of the circumferential direction dc in the first circumferential groove 56 communicates with the rear groove 54, and the other end of the circumferential direction dc in the first circumferential groove 56 communicates with the first front groove 60. The other end of the circumferential direction dc in the second circumferential groove 57 communicates with the first front groove 60, and one end of the circumferential direction dc in the second circumferential groove 57 communicates with the second front groove 61. Furthermore, one end of the circumferential direction dc in the third circumferential groove 58 communicates with the second front groove 61, and the other end of the circumferential direction dc in the third circumferential groove 58 communicates with the third front groove 62. The ink 80 flowing from the ink storage section 16 towards the front end opening in the air passage 34 flows from one side to the other in the circumferential direction dc through the first circumferential groove 56, flows from the other side to the one side in the circumferential direction dc through the second circumferential groove 57, and flows from one side to the other in the circumferential direction dc through the third circumferential groove 58.

[0061] In this embodiment, the first wall portion 65, the second wall portion 66, and the third wall portion 67 each extend in the width direction of the first plane 70. In other words, the first wall portion 65, the second wall portion 66, and the third wall portion 67 extend in a direction perpendicular to the axial direction da in the first plane 70. The width direction is the direction perpendicular to the axial direction da on the first plane 70. In the example shown in Figure 20, the first wall portion 65, the second wall portion 66, and the third wall portion 67 each extend beyond the center in the width direction of the first plane 70.

[0062] Figure 24 is a diagram showing a modified example of the inner core 50 of this embodiment, and corresponds to Figure 20. In this modified example, the first wall portion 65, the second wall portion 66, and the third wall portion 67 each extend so as not to exceed the center in the width direction of the first plane 70.

[0063] In the examples shown in Figures 20 and 24, the first wall portion 65, the second wall portion 66, and the third wall portion 67 are arranged alternately in the axial direction da. As a result, the air passage 34 is configured to bend along the first plane 70.

[0064] Fourth Embodiment A fourth embodiment of the present invention will be described with reference to Figures 25 to 31. In the following description and the drawings used therein, parts that can be configured in the same way as in the first to third embodiments will be given the same reference numerals as those used in the descriptions of the first to third embodiments, and redundant explanations will be omitted.

[0065] Figure 25 is a perspective view illustrating a fourth embodiment of the present invention, showing the inner core 50. Figure 26 is a view of the inner core 50 from the radial outside. Figure 27 is a view of the inner core 50 along the arrow labeled XXVII in Figure 26. Figure 28 is a cross-sectional view corresponding to the line XXVIII-XXVIII in Figure 27. Figure 29 is a cross-sectional view corresponding to the line XXIX-XXIX in Figure 27. Figure 30 is a cross-sectional view corresponding to the line XXX-XXX in Figure 27. Figure 31 is a cross-sectional view corresponding to the line XXXX-XXXI in Figure 27.

[0066] In this embodiment, the inner core 50 includes a third wall portion 67 and a fourth wall portion 68, in addition to the first wall portion 65 and the second wall portion 66.

[0067] The third wall portion 67 is located in front of the second wall portion 66. In this embodiment, the third wall portion 67 is located in front of the second front groove 61. In particular, the third wall portion 67 is located at the front end of the second front groove 61. The third wall portion 67 has the function of obstructing the flow of ink 80 moving forward within the second front groove 61 and guiding the ink 80 to the third front groove 62, which will be described later. The fourth wall portion 68 is located in front of the third wall portion 67. In this embodiment, the fourth wall portion 68 is located in front of the third front groove 62. In particular, the fourth wall portion 68 is located at the front end of the third front groove 62. The fourth wall portion 68 has the function of obstructing the flow of ink 80 moving forward within the third front groove 62 and guiding the ink 80 to the fourth front groove 63, which will be described later.

[0068] In this embodiment, the third wall portion 67 and the fourth wall portion 68 each extend perpendicular to the axial direction da. That is, the third wall portion 67 and the fourth wall portion 68 are walls that extend in the circumferential direction dc and the radial direction, respectively. However, it is not limited to this, and at least one of the third wall portion 67 and the fourth wall portion 68 may extend in a direction inclined with respect to the axial direction da and the circumferential direction dc. For example, at least one of the third wall portion 67 and the fourth wall portion 68 may extend in a direction inclined with respect to the axial direction da and the circumferential direction dc such that it moves away from the second front groove 61 as it moves forward. In this case, the angle between the third wall portion 67 (fourth wall portion 68) and the circumferential direction dc may be 45 degrees or less. The angle between the third wall portion 67 (fourth wall portion 68) and the circumferential direction dc is the smaller of the two angles formed between the direction in which the third wall portion 67 (fourth wall portion 68) extends and the circumferential direction dc.

[0069] A third circumferential groove 58 is formed along the third wall portion 67. In this embodiment, the third circumferential groove 58 extends perpendicular to the axial direction da. That is, the third circumferential groove 58 extends in the circumferential direction dc. If the third wall portion 67 extends in a direction inclined with respect to the axial direction da and the circumferential direction dc, the third circumferential groove 58 may also extend in a direction inclined with respect to the axial direction da and the circumferential direction dc.

[0070] Furthermore, a fourth circumferential groove 59 is formed along the fourth wall portion 68. In this embodiment, the fourth circumferential groove 59 extends perpendicular to the axial direction da. That is, the fourth circumferential groove 59 extends in the circumferential direction dc. If the fourth wall portion 68 extends in a direction inclined with respect to the axial direction da and the circumferential direction dc, the fourth circumferential groove 59 may also extend in a direction inclined with respect to the axial direction da and the circumferential direction dc.

[0071] The inner core 50 has a third plane 72 that is positioned offset in the circumferential direction dc relative to the second plane 71 and extends parallel to the central axis A. In this embodiment, the third plane 72 is positioned offset by 180 degrees in the circumferential direction dc relative to the second plane 71.

[0072] Furthermore, the inner core 50 has a fourth plane 73 that is positioned offset in the circumferential direction dc relative to the third plane 72 and extends parallel to the central axis A. In this embodiment, the fourth plane 73 is positioned offset by 180 degrees in the circumferential direction dc relative to the third plane 72.

[0073] In this embodiment, the first plane 70 and the third plane 72 are located on the same plane. In other words, the plane obtained by extending the first plane 70 forward coincides with the third plane 72. However, the first plane 70 and the third plane 72 may be offset from each other in the circumferential direction dc and / or radial direction. Also, in this embodiment, the second plane 71 and the fourth plane 73 are located on the same plane. In other words, the plane obtained by extending the second plane 71 forward coincides with the fourth plane 73. However, the second plane 71 and the fourth plane 73 may be offset from each other in the circumferential direction dc and / or radial direction.

[0074] In this embodiment, the inner core 50 has a third front groove 62. The third front groove 62 may be provided along a third plane 72. The rear end of the third front groove 62 communicates with a third circumferential groove 58, and the front end of the third front groove 62 communicates with a fourth circumferential groove 59. In other words, the third front groove 62 connects the third circumferential groove 58 and the fourth circumferential groove 59. The third front groove 62 extends linearly along the axial direction da.

[0075] In this embodiment, the inner core 50 also has a fourth front groove 63. The fourth front groove 63 may be provided along the fourth plane 73. The rear end of the fourth front groove 63 communicates with the fourth circumferential groove 59, and the front end of the fourth front groove 63 opens forward. In other words, the fourth front groove 63 communicates with the fourth circumferential groove 59 and the front end opening of the air passage 34. The fourth front groove 63 extends linearly along the axial direction da.

[0076] In this embodiment, one end of the circumferential dc in the first circumferential groove 56 communicates with the rear groove 54, and the other end of the circumferential dc in the first circumferential groove 56 communicates with the first front groove 60. One end of the circumferential dc in the second circumferential groove 57 communicates with the first front groove 60, and the other end of the circumferential dc in the second circumferential groove 57 communicates with the second front groove 61. One end of the circumferential dc in the third circumferential groove 58 communicates with the second front groove 61, and the other end of the circumferential dc in the third circumferential groove 58 communicates with the third front groove 62. One end of the circumferential dc in the fourth circumferential groove 59 communicates with the third front groove 62, and the other end of the circumferential dc in the fourth circumferential groove 59 communicates with the fourth front groove 63.

[0077] Ink 80 flowing from the ink storage section 16 to the front opening through the air passage 34 flows from one side to the other in the circumferential direction dc through the first circumferential groove 56, from one side to the other in the circumferential direction dc through the second circumferential groove 57, from one side to the other in the circumferential direction dc through the third circumferential groove 58, and from one side to the other in the circumferential direction dc through the fourth circumferential groove 59. In other words, ink 80 flowing from the ink storage section 16 to the front opening through the air passage 34 flows in the same direction in the circumferential direction dc through the first circumferential groove 56, the second circumferential groove 57, the third circumferential groove 58, and the fourth circumferential groove 59.

[0078] Fifth Embodiment A fifth embodiment of the present invention will be described with reference to Figures 32 to 38. In the following description and the drawings used therein, parts that can be configured in the same way as in the first to fourth embodiments will be given the same reference numerals as those used in the descriptions of the first to fourth embodiments, and redundant explanations will be omitted.

[0079] The inner core 50 of this embodiment includes a throttling section 75. The throttling section 75 is located between the first wall section 65 and the second wall section 66. In particular, in this embodiment, the throttling section 75 is located in the middle portion of the first front groove 60. The throttling section 75 includes one or more slits 76. In the example shown in Figure 33, the throttling section 75 has two slits 76 aligned in the width direction of the first plane 70. Each slit 76 extends linearly along the axial direction da. The two slits 76 extend parallel to each other. The throttling section 75 may include only one slit 76 or three or more slits 76. The cross-sectional area of ​​the air passage 34 in the throttling section 75 is smaller than the cross-sectional area of ​​the air passage 34 before and after the throttling section 75. This increases the resistance of the throttling section 75 to the flow of ink 80. Therefore, the momentum of the forward flow of ink 80 can be reduced in the throttling section 75.

[0080] The pen tip 30 of this embodiment includes a constricted portion 75 positioned between the first wall portion 65 and the second wall portion 66.

[0081] With this type of pen nib 30, the cross-sectional area of ​​the air passage 34 in the diaphragm 75 is smaller than the cross-sectional area of ​​the air passage 34 before and after the diaphragm 75. As a result, the resistance of the diaphragm 75 to the flow of ink 80 increases. Therefore, the force of the forward flow of ink 80 can be reduced in the diaphragm 75.

[0082] Sixth Embodiment A sixth embodiment of the present invention will be described with reference to Figures 39 and 40. In the following description and the drawings used therein, parts that can be configured in the same way as in the first to fifth embodiments will be given the same reference numerals as those used in the descriptions of the first to fifth embodiments, and redundant explanations will be omitted.

[0083] Figure 39 is a diagram illustrating a sixth embodiment according to the present invention, and is a perspective view showing the inner core 50. Figure 40 is a diagram showing the inner core 50 viewed from the radial outside.

[0084] In this embodiment, a helical groove 78 is formed in front of the first wall portion 65. The helical groove 78 extends forward while rotating around the central axis of the inner core 50. The rear end of the helical groove 78 communicates with the first circumferential groove 56, and the front end of the helical groove 78 communicates with the front groove 64, which will be described later. In other words, the helical groove 78 connects the first circumferential groove 56 and the front groove 64.

[0085] In this embodiment, the rearward-facing surface of the helical groove 78 forms the second wall portion 66. Therefore, the second wall portion 66 extends in a helical shape. The second wall portion 66 has the function of obstructing the flow of ink 80 toward the front within the air passage 34. The angle between the second wall portion 66 and the circumferential direction dc may be 45 degrees or less. The angle between the second wall portion 66 and the circumferential direction dc is the smaller of the two angles formed between the direction in which the second wall portion 66 extends and the circumferential direction dc.

[0086] The inner core 50 has a front groove 64. The rear end of the front groove 64 communicates with the helical groove 78, and the front end of the front groove 64 opens forward. In other words, the front groove 64 connects the helical groove 78 with the front opening of the ink passage 32. The front groove 64 extends linearly along the axial direction da.

[0087] In the pen tip 30 of this embodiment, the second wall portion 66 extends in a spiral shape.

[0088] With this type of pen tip 30, the ink 80 that moves forward through the rear groove 54 first collides with the first wall portion 65. This reduces the momentum of the forward flow of ink 80. Subsequently, the ink 80 flows along the first wall portion 65 through the first circumferential groove 56 and heads toward the helical groove 78. The ink 80 that flows into the helical groove 78 collides with the second wall portion 66. This further reduces the momentum of the forward flow of ink 80. Therefore, it is possible to effectively suppress ink 80 from splashing out of the front end opening of the air passage 34.

[0089] Furthermore, according to the pen tip 30 of this embodiment, the air passage 34 extends in a spiral shape, increasing the overall length of the air passage 34. This increases the resistance of the air passage 34 to the flow of ink 80. Therefore, the momentum of the forward flow of ink 80 can be reduced. This also effectively prevents ink 80 from splashing out of the front end opening of the air passage 34. [Explanation of Symbols]

[0090] 10 fountain pens 12 shaft cylinder 14 Connecting Members 16 Ink reservoir 20 Writing components 22 nibs 24 Pen Point 26 Cutting 30 Pen nibs 32 Ink passage 34 Air passage 40 Outer core 42 Through hole 44. First Slit 46 Outer surface 48 Comb groove 50 inner core 52. Second Slit 54 Posterior groove 56 Circumferential groove (1st circumferential groove) 57 Other circumferential grooves (second circumferential grooves) 58 3rd circumferential groove 59 4th circumferential groove 60 Front groove (first front groove) 61 Other anterior grooves (second anterior groove) 62 Third forward groove 63. Fourth forward groove 64 Front groove 65 1st wall 66 2nd wall section 67 Third wall 68 4th wall 70 1st plane 71 Second plane 72 3rd plane 73 4th plane 75 Aperture section 76 slits 78 Spiral groove 80 ink A Center axis da axis direction dc circumferential direction

Claims

1. The ink passage through which ink flows from the ink reservoir to the pen tip when writing, An air passage through which air flows from the outside toward the ink storage section, An outer core having a through hole extending in the axial direction, A fountain pen nib comprising an inner core disposed within the aforementioned through hole, The outer core has a first slit that connects the through hole and the outer surface of the outer core, The aforementioned inner core is It has a second slit that extends in the axial direction and communicates with the first slit, a rear groove that extends in the axial direction, a first wall portion positioned in front of the rear groove, and a second wall portion positioned in front of the first wall portion. The ink passage includes the first slit and the second slit, The air passage includes the rear groove, the first wall portion, and the second wall portion, and is a pen nib.

2. A circumferential groove extending circumferentially along the first wall portion, The system further comprises a front groove that communicates with the circumferential groove and extends axially, and is positioned offset circumferentially from the rear groove, The pen tip according to claim 1, wherein the second wall portion is positioned in front of the front groove.

3. Other circumferential grooves extending circumferentially along the second wall portion, It further comprises another front groove that extends axially and communicates with the other circumferential groove, and is positioned offset circumferentially from the front groove, One end of the circumferential groove communicates with the rear groove, and the other end of the circumferential groove communicates with the front groove. The pen tip according to claim 2, wherein one end in the circumferential direction of the other circumferential groove communicates with the front groove, and the other end in the circumferential direction of the other circumferential groove communicates with the other front groove.

4. Other circumferential grooves extending circumferentially along the second wall portion, It further comprises another front groove that extends axially and communicates with the other circumferential groove, and is positioned offset circumferentially from the front groove, One end of the circumferential groove communicates with the rear groove, and the other end of the circumferential groove communicates with the front groove. The pen tip according to claim 2, wherein the other circumferential end of the other circumferential groove communicates with the front groove, and the one circumferential end of the other circumferential groove communicates with the other front groove.

5. The pen nib according to claim 1, further comprising a constricted portion disposed between the first wall portion and the second wall portion.

6. The pen tip according to claim 1, wherein the second wall portion extends in a spiral shape.

7. A fountain pen having the nib described in any one of claims 1 to 6.

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