Writing instrument and nib component

Abstract

A writing tool (1) and a tip member (2) have a tip (11) having a writing portion (22), a direction of writing with the writing portion (22) being defined, a cylindrical inner cylinder (13) fixing the tip (11), a cylindrical outer cylinder (14) into which the inner cylinder (13) is insertable, a finger guide portion (41) being provided on an outer peripheral surface, and a fixing member (15) fixing the outer cylinder (14) to the inner cylinder (13).

Description

Technical Field

[0001] This invention relates to a writing tool that uses a pen tip for writing and a pen tip component for the writing tool. Background Technology

[0002] Writing instruments that allow writing on paper surfaces using a pen tip are known. As described above, these writing instruments are held by the user's fingers. Therefore, various improvements have been made to the shape of the gripping part, the raw materials, etc., resulting in improvements such as ease of grip, reduced slippage, and reduced fatigue. For example, a ballpoint pen like this is disclosed in Japanese Patent Application Publication No. 2009-178852.

[0003] The shape of the clamping part of a ballpoint pen, as a writing instrument, can be various, such as cylindrical, conical, or a shape formed by removing one or more parts of a cylindrical or conical shape, or a shape where a portion of the circumference is recessed or convex. Furthermore, the resin material forming the clamping part is known to have various hardness settings, ranging from hard to soft materials, and even materials containing air or gel. Additionally, writing instruments using metal materials for the clamping part are also known.

[0004] In addition, Japanese Patent No. 4972934 discloses a technology for a fountain pen as a writing tool, in order to align the emblem, pattern and nib of the main body, the writing unit is configured to be freely rotatable relative to the main body of the fountain pen, and the rotational resistance can be set by increasing or decreasing the amount of the loaded elastic body.

[0005] In addition, Japanese Patent Application Publication No. 2007-331364 disclosed a bamboo pen in which the bamboo nib body is inserted into the pen shaft.

[0006] Patent Document 1: Japanese Patent Application Publication No. 2009-178852

[0007] Patent Document 2: Japanese Patent No. 4972934

[0008] Patent Document 3: Japanese Patent Application Publication No. 2007-331364 Summary of the Invention

[0009] In the technology of Patent Document 1, gripping is easy. For example, with a ballpoint pen, the writing part contacts the paper to a certain extent depending on the type of writing instrument. Therefore, even if the posture of the writing instrument changes when the fingers hold it, writing can be done stably. On the other hand, with writing instruments such as ballpoint pens, the gripping part for the fingers is not constant. Sometimes the feel of contact changes when gripping, and sometimes the desired feel of contact is not obtained during use.

[0010] For example, if the gripping part is cylindrical or truncated cone-shaped, it can be adjusted by changing the gripping method, but each time the gripping position is changed, it is necessary to explore a gripping method that can achieve a comfortable fit.

[0011] In addition, we also considered making the shape of the gripping part recessed in one or more places, and setting the markings for holding it with the fingers on the writing instrument. However, if one's own grip does not match the writing part set by the markings along the paper, one cannot get the desired fit.

[0012] Furthermore, regarding the technologies in Patent Documents 2 and 3, if the writing part is grasped and its position adjusted during assembly or in a dry state without ink, it becomes possible to adjust the writing part by gripping it. However, if the writing part is filled with ink, it causes the fingers to get dirty during adjustment.

[0013] In addition, there are writing instruments like fountain pens where it is undesirable to apply excessive force to the writing section after assembly. As mentioned above, it is difficult to adjust the writing section after writing.

[0014] Furthermore, while ballpoint pens, for example, have a spherical tip for the writing section, which generally doesn't present a problem if it maintains a consistent level of contact with the paper, there are writing instruments where the writing section and paper may not make consistent contact depending on the grip method. This is due to variations in the product's design, grip methods, and writing habits. Representative writing instruments experiencing these issues include fountain pens with ground nibs, markers with directional blade shapes, and pens where the optimal writing direction or hardness is adjusted by the way the bristles are bound. Moreover, these writing instruments sometimes experience writing difficulties, such as stuttering, blurred lines, or broken lines, depending on the position (direction) of the writing section, leading to writing frustration.

[0015] Therefore, the object of the present invention is to provide a writing instrument and a pen tip component capable of adjusting the circumferential position of the finger guide relative to the writing part.

[0016] One aspect of the present invention relates to a writing instrument comprising: a pen tip having a writing portion and a writing direction defined by the writing portion; a cylindrical inner tube for fixing the pen tip; a cylindrical outer tube into which the inner tube can be inserted and having a finger guide on its outer circumferential surface; a fixing member for fixing the outer tube to the inner tube; and a tube body fixed to the inner tube.

[0017] One aspect of the present invention relates to a pen tip component comprising: a pen tip having a writing portion and a writing direction defined by the writing portion; a cylindrical inner cylinder for fixing the pen tip; a cylindrical outer cylinder into which the inner cylinder can be inserted and having a finger guide on its outer circumferential surface; and a fixing member for fixing the outer cylinder to the inner cylinder.

[0018] The effects of the invention

[0019] According to the present invention, a writing instrument and a pen tip component are provided that can adjust the circumferential position of the finger guide relative to the writing part. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view showing the structure of a writing instrument according to one embodiment of the present invention.

[0021] Figure 2 It is a cross-sectional view showing the structure of the pen tip component of the writing instrument.

[0022] Figure 3 This is a cross-sectional view showing the structure of the pen tip component.

[0023] Figure 4 This is a perspective view showing the structure of the pen tip component.

[0024] Figure 5 This is a cross-sectional view showing the structure of the inner and outer cylinders of the pen tip component.

[0025] Figure 6 This is an illustrative diagram showing an example of the use of this writing instrument.

[0026] Figure 7 This is an illustrative diagram showing an example of the use of this writing instrument.

[0027] Figure 8 This is a cross-sectional view showing the structure of the pen tip component of a writing instrument according to another embodiment of the present invention.

[0028] Figure 9 This is a cross-sectional view showing the structure of the pen tip component of a writing instrument according to another embodiment of the present invention. Detailed Implementation

[0029] Below, we will discuss a writing instrument 1 and a pen tip component 2 used in the writing instrument 1 according to one embodiment of the present invention. Figures 1 to 7 Please provide an explanation.

[0030] Figure 1 This is a cross-sectional view showing the structure of a writing instrument 1 according to one embodiment of the present invention. Figure 2This is a cross-sectional view showing the structure of the pen tip component 2 of the writing instrument 1. Figure 3 This is a cross-sectional view showing the structure of the pen tip component 2 and an example of its use. Figure 4 This is a perspective view showing the structure of pen tip component 2. Figure 5 This is a cross-sectional view showing the structure of the inner cylinder 13 and outer cylinder 14 of the pen tip component 2. Figure 6 This is an illustrative diagram showing an example of the use of writing tool 1. Figure 6 The left image shows the outer cylinder 14 before its position is adjusted, and the right image shows the outer cylinder 14 after its position is adjusted. Figure 7 This is an explanatory diagram showing the positional relationship between the guide portion 41 of the outer cylinder 14 and the writing portion 22 of the pen tip 11, as an example of the use of the writing instrument 1.

[0031] In this embodiment, the writing instrument 1 has a defined writing direction. Here, the defined writing direction refers to the ability to write in a specific position around the writing instrument 1 when applying ink to a paper surface. Furthermore, the defined writing here means, for example, writing that does not cause stuttering, blurring, or cracking of the writing line due to the position (direction) of the writing part of the pen tip.

[0032] For example, examples of writing tools 1 that have a defined writing direction include fountain pens (made by grinding the nib), markers (shaped like a directional sheet), and pens whose optimal writing direction or hardness is changed by the way the bristles are bundled. However, writing tool 1 is not limited to these types of writing tools; in this embodiment, the example of a fountain pen will be used to describe writing tool 1.

[0033] like Figure 1 As shown, the writing instrument 1 includes, for example, a pen nib 11, a pen refill 12, an inner cylinder 13, an outer cylinder 14, a fixing element 15, a cylinder body 16, and an ink reservoir 17. For example, as... Figure 2 and Figure 3 As shown, the pen tip 11, pen core 12, inner cylinder 13, outer cylinder 14 and fixing part 15 of the writing instrument 1 constitute the pen tip component 2.

[0034] The nib 11 specifies the writing direction. For example... Figures 1 to 4 , Figure 6 and Figure 7 As shown, the pen tip 11 has a pen body 21 and a writing portion 22 formed at the front end of the pen body 21. The pen body 21 is formed into a thin plate shape with a pointed front end. The pen body 21 is, for example, formed of an ink-resistant material.

[0035] As shown in this embodiment, when the writing instrument 1 is a fountain pen, the pen body 21 is made of an acid- and alkali-resistant metal material, such as a gold alloy or stainless steel. The writing part 22 is formed at the front end of the pen body 21 and is configured to apply ink to the paper surface.

[0036] As a specific example, such as Figure 2 , Figure 4 , Figure 6 and Figure 7 As shown, the pen body 21 has a pen tip 23 at its front end. Additionally, the pen body 21... Figure 4 As shown, a core hole 24 is formed on the pen body 21 from the front end to the center, and a groove (slit) 25 is formed from the front end of the pen body 21, which includes the pen tip 23, to the core hole 24. The pen body 21 can display text, graphics, logos, etc., through methods such as grooving, engraving, printing, or plating. The writing part 22 is the pen tip 23 with the slit 25 formed therein.

[0037] The pen tip 11 supplies ink to the front end of the pen body 21 through a slit 25 formed in the pen body 21 using capillary action. The pen head 23 serves as the writing part 22, and the ink supplied through the slit 25 can be applied to the paper surface.

[0038] The pen refill 12 supplies ink to the pen tip 11. For example, the pen refill 12 causes ink to flow from the ink reservoir 17 to the pen tip 11 through capillary action. In addition, the pen refill 12 introduces air in the amount of ink flowing to the pen tip 11, performing a so-called air-liquid exchange, and allowing ink to flow from the ink reservoir 17 to the pen tip 11.

[0039] like Figures 1 to 3 As shown, the pen refill 12 is fixed to one end of the pen tip 11, and the other parts are fixed inside the inner cylinder 13. For example, the other end of the pen refill 12 is formed to have a smaller diameter than the other parts and is disposed inside the ink reservoir 17.

[0040] Inner cylinder 13 is the so-called shaft cylinder or head cylinder. For example... Figures 1 to 3 As shown, the inner cylinder 13 holds the pen refill 12, on which the pen tip 11 is mounted, with the front end of the pen tip 11, i.e., the writing part 22, and the core hole exposed to the outside. For example, the inner cylinder 13 holds the pen refill 12 by fitting it inside.

[0041] like Figures 1 to 4 As shown, the inner cylinder 13 has, for example, a seat portion 31, an external thread portion 32, a protrusion portion 33, and a fixing portion 34.

[0042] The seat portion 31 is formed, for example, on the outer peripheral surface of one end of the inner cylinder 13 in the axial direction. The seat portion 31 is a radially outwardly protruding annular protrusion formed on the outer peripheral surface of one end of the inner cylinder 13. The end face of the seat portion 31 abuts against the end of the outer cylinder 14.

[0043] The external thread 32 is formed axially on the outer circumferential surface of the other end of the inner cylinder 13.

[0044] The protrusion 33 is a protrusion formed on a portion of the outer peripheral surface of the inner cylinder 13 between the seat portion 31 and the external thread portion 32. For example... Figure 2 As shown, the protrusion 33 is formed on a portion of the inner cylinder 13 that is radially opposite to the outer cylinder 14 when the inner cylinder 13 is disposed within the outer cylinder 14. For example, the protrusion 33 is formed on the outer peripheral surface of the inner cylinder 13 adjacent to the seat portion 31. Figures 2 to 4 As shown, the protrusion 33 is, for example, a protrusion extending axially in the inner cylinder 13.

[0045] like Figure 5 As shown, multiple protrusions 33 are provided at predetermined intervals along the circumference of the inner cylinder 13. Here, the multiple protrusions 33 can be arranged at equal intervals or non-equal intervals along the circumference of the inner cylinder 13. In this embodiment, the protrusions 33 are as follows... Figure 5 As shown, four protrusions are arranged at 90° intervals around the circumference of the inner cylinder 13. In addition, the cross-sectional shape orthogonal to the length direction of the protrusion 33 is formed, for example, as a trapezoidal shape with a narrow top.

[0046] The fixing part 34 is provided, for example, inside the inner cylinder 13, and is formed into a cylindrical shape with a diameter smaller than the inner diameter of the inner cylinder 13. Figure 1 As shown, the fixing part 34 is configured to secure the ink reservoir 17. The front end of the fixing part 34 is inclined relative to the axial direction, for example. The fixing part 34 internally accommodates the other end of the pen refill 12.

[0047] The outer cylinder 14 is cylindrical. For example, the outer cylinder 14 is formed with a diameter slightly larger than the outer diameter of the inner cylinder 13, allowing it to be inserted into the inner cylinder 13. The outer cylinder 14 constitutes the clamping part of the writing instrument 1. Figure 4 and Figure 7 As shown, the outer cylinder 14 has a guide portion 41 on its outer peripheral surface for the user to clamp with their fingers.

[0048] Additionally, the outer cylinder 14, for example, Figure 4 As shown, a plurality of grooves 42 are formed on the inner circumferential surface of one end opposite the seat portion 31 of the inner cylinder 13, arranged at predetermined intervals along the circumference. In addition, for example, the inner diameter of the other end of the outer cylinder 14 is formed to be larger than the inner diameter of the other end.

[0049] The guide portion 41 is formed on the outer peripheral surface of the outer cylinder 14 in a recess, protrusion, or a predetermined shape that is touched by the user's fingers. The guide portion 41 guides the placement of the user's fingers. For example, in this embodiment, the guide portion 41 is as follows: Figure 4 and Figure 7As shown, two recesses 41a, 41a are disposed at two circumferential locations on the outer peripheral surface of the outer cylinder 14. Figure 7 As shown, the two recesses 41a, 41a are formed in the same shape, for example, so that the writing instrument 1 can be touched by the thumb and index finger, and is positioned on the upper side of the outer peripheral surface of the outer cylinder 14 in the writing posture.

[0050] like Figures 2 to 4 As shown, the groove 42 is an axially extending recess. For example, multiple grooves 42 are provided at predetermined intervals circumferentially on the outer cylinder 14. The groove 42 can be formed by cutting away the inner circumferential surface of the outer cylinder 14, or it can be configured by forming multiple axially extending protrusions on the inner circumferential surface of the outer cylinder 14, thereby forming between the multiple protrusions. The protrusions 33 can be disposed in the groove 42 and engage with the disposed protrusions 33 circumferentially. The groove 42 is formed in the inner circumferential surface of the outer cylinder 14 at a position that radially opposes the protrusions 33 formed in the inner cylinder 13 when the inner cylinder 13 is disposed inside the outer cylinder 14. The groove 42 is formed on the inner circumferential surface of the end side that abuts against the inner cylinder 13 of the outer cylinder 14.

[0051] Multiple slots 42 are provided for multiple protrusions 33 to be inserted into, and the slots 42 with the protrusions 33 engage with the protrusions 33 in the circumferential direction, thereby restricting the relative circumferential movement of the inner cylinder 13 and the outer cylinder 14.

[0052] like Figure 5 As shown, the number of grooves 42 is greater than the number of protrusions 33 formed on the inner cylinder 13. For example, the grooves 42 are arranged at equal intervals in the circumferential direction of the outer cylinder 14. Furthermore, the grooves 42 can be arranged at non-equal intervals in the circumferential direction of the outer cylinder 14, provided that the protrusions 33 can be arranged therein. In this embodiment, as... Figure 5 As shown, grooves 42 are provided at 36 locations on the circumference of the inner cylinder 13 at 10° intervals. In addition, the cross-sectional shape of the opening orthogonal to the length direction of the grooves 42 is, for example, formed as a trapezoidal shape with a narrow bottom.

[0053] The fastener 15 secures the outer cylinder 14, which is disposed on the outer circumferential surface of the inner cylinder 13, to the inner cylinder 13. As a specific example, the fastener 15 is formed into a cylindrical shape with one end abutting against the other end of the outer cylinder 14 in the axial direction. The axial length of the fastener 15 is less than the axial length of the external thread portion 32 of the inner cylinder 13.

[0054] Figures 2 to 4 The fastener 15 has an internal thread 51 formed on its inner circumferential surface. That is, the fastener 15 is a so-called threaded ring. Furthermore, as... Figures 2 to 4 As shown, the fastener 15 has, for example, a radially formed protrusion 52 on the center side at the end that abuts against the outer cylinder 14.

[0055] The internal thread 51 is formed on the inner circumferential surface of the fastener 15 and is screwed into the external thread 32 of the inner cylinder 13.

[0056] The protrusion 52 is an annular protrusion extending axially and coaxially with the fastener 15. The outer diameter of the protrusion 52 is formed to be the same as or slightly larger than the inner diameter of the other end of the outer cylinder 14. The outer peripheral surface of the protrusion 52 abuts against the inner peripheral surface of the other end of the outer cylinder 14, providing radial support to the other end of the outer cylinder 14.

[0057] The cylindrical body 16 is fixed to the inner cylinder 13. The cylindrical body 16 is formed into a bottomed cylindrical shape, which can accommodate an ink reservoir 17. The cylindrical body 16 has an internal thread 61 formed on the inner circumferential surface at one end of the opening. The internal thread 61 engages with the external thread 32 of the inner cylinder 13.

[0058] The ink reservoir 17 stores ink. The ink reservoir 17 may be, for example, a disposable ink cartridge, or an ink refill device such as a converter. The ink reservoir 17 is fixed to the fixing part 34 of the inner cylinder 13 and supplies ink to the pen refill 12 disposed in the fixing part 34.

[0059] The writing instrument 1 (pen tip component 2) constructed as described above is, for example, Figure 5 As shown, the axial length of the plurality of protrusions 33 and the plurality of grooves 42 is set such that, when the fixing member 15 is moved to the rear end side of the external thread portion 32 of the inner cylinder 13 opposite to the pen tip 11 side, the protrusions 33 and grooves 42 are separated, allowing the outer cylinder 14 to rotate circumferentially relative to the inner cylinder 13. In other words, the axial length of the plurality of protrusions 33 and the plurality of grooves 42 is set to be shorter than the length obtained by subtracting the length of the outer cylinder 14 and the length of the fixing member 15 excluding the protrusions 52 from the length from the seat portion 31 of the inner cylinder 13 to the rear end. In further terms, the axial length of the plurality of protrusions 33 and the plurality of grooves 42 is less than the axial length of the fixing member 15 that can be screwed into the external thread portion 32, that is, the distance that the fixing member 15 can move when screwed into the external thread portion 32.

[0060] According to the writing instrument 1 (pen tip component 2) constructed as described above, such as Figure 2 and Figure 5 As shown, if the multiple protrusions 33 and the multiple grooves 42 engage, the relative circumferential movement of the inner cylinder 13 and the outer cylinder 14 is restricted. Furthermore, as... Figure 2 As shown, the fastener 15 is screwed into the external thread 32 of the inner cylinder 13, causing the outer cylinder 14 to abut against the seat 31 of the inner cylinder 13 and the end face of the fastener 15, thereby restricting the relative axial movement of the inner cylinder 13 and the outer cylinder 14. Furthermore, as... Figure 2As shown, multiple grooves 42 abut against multiple protrusions 33 of the inner cylinder 13 in the radial direction. Therefore, one end of the outer cylinder 14 is radially supported by the inner cylinder 13, and its inner circumferential surface abuts against the outer circumferential surface of the protrusion 52 of the fixing member 15 in the radial direction. The other end of the outer cylinder 14 is radially supported by the fixing member 15, which is screwed onto the inner cylinder 13. Thus, the outer cylinder 14 is radially supported at both ends relative to the inner cylinder 13, thereby restricting its radial movement relative to the inner cylinder 13. Therefore, the outer cylinder 14 is fixed to the inner cylinder 13.

[0061] Therefore, even if the writing instrument 1 (pen tip component 2) is designed to allow the outer cylinder 14 to move axially and circumferentially relative to the inner cylinder 13, the movement of the outer cylinder 14 can be prevented during use. In addition, when the user holds the writing instrument 1 with their fingers each time they write, the guide part 41 guides the fingers, so the writing instrument 1 can be used in a constant grip.

[0062] Furthermore, while the pen tip 11 of the writing instrument 1 (pen tip component 2) has a defined writing direction, its structure allows the outer cylinder 14 to rotate relative to the inner cylinder 13. Therefore, the user can adjust the circumferential position of the guide portion 41, which is in contact with the finger, relative to the writing portion 22 of the pen tip 11. Thus, the writing instrument 1... Figure 6 As shown in the left figure, relative to the direction of the writing surface 100a of the paper type 100, the writing part 22 of the pen tip 11 is inclined relative to the contact surface 100a of the paper surface 100a. Even when the user holds the writing instrument 1 in the same gripping manner, proper writing is not possible, as... Figure 6 As shown in the right figure, the writing part 22 relative to the paper surface 100a can also be adjusted to an appropriate position relative to the contact surface of the paper surface 100a.

[0063] The adjustment method for writing instrument 1 will be explained in detail. First, the inner cylinder 13 and the outer cylinder 14 are as follows: Figure 2 As shown, multiple protrusions 33 and multiple grooves 42 engage, thereby restricting relative circumferential movement. Furthermore, the inner cylinder 13 and outer cylinder 14, as... Figure 3 As shown, the inner cylinder 13 and the outer cylinder 14 are axially offset until the multiple protrusions 33 and the multiple grooves 42 become disengaged, thereby enabling the outer cylinder 14 to rotate circumferentially relative to the inner cylinder 13.

[0064] like Figure 7As indicated by the middle arrow, the outer cylinder 14 is rotated circumferentially relative to the inner cylinder 13 so that the user's finger and the guide portion 41 are in an appropriate position relative to the writing portion 22 of the pen tip 11, and the outer cylinder 14 is fixed by the fixing member 15. As described above, the writing instrument 1 can adjust the position of the guide portion 41 of the outer cylinder 14 relative to the writing portion 22 of the pen tip 11. Therefore, the writing instrument 1 can be adjusted so that the relative position of the writing portion 22 of the pen tip 11 and the guide portion 41 of the outer cylinder 14, which serves as a clamping part, is appropriate for the user's gripping method of the writing instrument 1. As a result, when writing, the writing portion 22 can properly contact the paper surface 100a, so that the writing portion 22 can fit against the paper surface 100a for each user's gripping method, preventing jamming, blurring of the writing line, cracking of the writing line, etc.

[0065] Furthermore, the circumferential position of the outer cylinder 14 relative to the writing portion 22 of the pen tip 11 can be adjusted to the same number of positions as the number of slots 42. For example, in this embodiment, 36 slots 42 are provided, so the outer cylinder 14 can be fixed in 36 circumferential positions. That is, in this embodiment, the outer cylinder 14 can be rotated relative to the writing portion 22 of the pen tip 11 at 10° intervals.

[0066] Furthermore, during the adjustment of the outer cylinder 14, the retaining member 15 does not need to be completely removed from the external threaded portion 32 of the inner cylinder 13. Simply rotate it until the plurality of protrusions 33 and the plurality of grooves 42 are in a non-engaged position axially. After moving the outer cylinder 14 axially relative to the inner cylinder 13, rotate the outer cylinder 14 and then rotate the retaining member 15 in the tightening direction. Additionally, if the engagement of the protrusions 33 and grooves 42 is released, the rotation of the outer cylinder 14 is not restricted; therefore, the outer cylinder 14 can be rotated without applying significant force. Thus, the writing instrument 1 (pen tip component 2) can be easily adjusted by rotating the outer cylinder 14. Furthermore, since the inner cylinder 13 is configured to fix the pen tip 11, the pen refill 12, and the ink reservoir 17, when adjusting the outer cylinder 14, the user can grasp the inner cylinder 13 and rotate the retaining member 15, allowing the outer cylinder 14 to slide and rotate. This prevents ink from adhering to the user's fingers during the adjustment of the outer cylinder 14.

[0067] Furthermore, the writing instrument 1 and the pen tip component 2 can be attached to and detached from the inner cylinder 13, the outer cylinder 14, the fixing member 15, the cylinder body 16, and the ink reservoir 17. Therefore, when performing maintenance or changing the ink color, only the necessary components can be cleaned. As a result, the writing instrument 1 and the pen tip component 2 can be prevented from being exposed to liquid during cleaning and from leaving any liquid residue.

[0068] The writing instrument 1 and pen tip component 2 configured as described above can adjust the circumferential position of the outer cylinder 14, which serves as the clamping part, relative to the writing part 22.

[0069] Furthermore, the present invention is not limited to the embodiments described above. For example, in the above example, the structure of providing two recesses 41a, 41a of the same shape at two circumferential locations on the outer peripheral surface of the outer cylinder 14 for the guide portion 41 has been described, but it is not limited to this. For example, the two recesses 41a, 41a can be configured such that one recess 41a is for the thumb and the other recess 41a is for the index finger, so that the thumb and index finger can contact each other. In addition, the outer cylinder 14 having one recess 41a configured for the thumb and the other recess 41a configured for the index finger can be used for either right-handed or left-handed users. Furthermore, for example, if the outer cylinder 14 is configured with a guide portion 41 having one recess 41a set for the thumb and another recess 41a set for the index finger, by configuring the inner circumferential surface at both ends to have a larger diameter than other parts and providing multiple grooves 42 at both ends, it can be configured such that by reversing the orientation of the ends in the axial direction, the outer cylinder 14 can be used for both right-handed and left-handed users.

[0070] Furthermore, the example described above shows one instance of the number of protrusions 33 and grooves 42, but the number of protrusions 33 and grooves 42 can be appropriately set. For example, by increasing the number of grooves 42, the angle at which the circumferential position of the outer cylinder 14 can be adjusted relative to the writing portion 22 of the pen tip 11 can be reduced, thus enabling more detailed adjustments.

[0071] Furthermore, in the above example, the structure in which multiple protrusions 33 are provided on the outer peripheral surface of the inner cylinder 13 and multiple grooves 42 are provided on the inner peripheral surface of the outer cylinder 14 has been described, but it is not limited to this. For example, it may also be configured such that multiple protrusions 33 are provided on the end face of the seat portion 31 of the inner cylinder 13 and multiple grooves 42 are provided on the end face of the outer cylinder 14 opposite to the seat portion 31.

[0072] Alternatively, for example, the writing instrument 1 and the pen tip component 2 can be used as another embodiment, based on the structure of the above-described embodiment, such as... Figure 8 As shown, a seal 18 for preventing loosening can be provided between the seat 31 of the inner cylinder 13 and one end of the outer cylinder 14, and between the other end of the outer cylinder 14 and the end of the fastener 15.

[0073] Furthermore, when the structure is configured with a seal 18, the circumferential movement of the outer cylinder 14 can be restricted by the friction of the seal 18. Therefore, for example... Figure 9As shown, the device can be configured such that multiple protrusions 33 are not provided in the inner cylinder 13, and multiple grooves 42 are not provided in the outer cylinder 14. According to the writing instrument 1 (pen tip component 2) described above, after adjusting the position of the pen tip 11 relative to the writing part 22 by rotating the outer cylinder 14 circumferentially around the inner cylinder 13, the fixing member 15 is tightened, thereby restricting the axial and circumferential movement of the outer cylinder 14. Therefore, the writing instrument 1 (pen tip component 2) described above can steplessly adjust the circumferential position of the outer cylinder 14 relative to the inner cylinder 13, enabling more detailed position adjustments of the outer cylinder 14.

[0074] Furthermore, in the above example, the writing instrument 1 has been described as having a fixing member 15 and a cylindrical body 16, with the fixing member 15 and the cylindrical body 16 screwed into the external thread portion 32 of the inner cylinder 13. However, this is not a limitation; the structure could also have the open end of the cylindrical body 16 function as the fixing member. That is, the fixing member 15 could be omitted, and the cylindrical body 16 could be used as the fixing member instead. As described above, the cylindrical body 16, which serves as the fixing member, could be configured, for example, to have a protrusion 52 at the open end, so that the end of the cylindrical body 16 abuts against the end of the outer cylinder 14 in the axial direction and provides radial support to the outer cylinder 14.

[0075] In addition, in the above example, the structure of the protrusion 52 provided in the fastener 15 or the cylinder 16 to support the outer cylinder 14 in the radial direction has been described, but it is not limited to this. It can also be configured to reduce the radial gap between the inner cylinder 13 and the outer cylinder 14, or to provide a protrusion that supports the inner circumferential surface of the outer cylinder 14, thereby supporting the outer cylinder 14 in the radial direction through the inner cylinder 13.

[0076] Furthermore, as described above, the writing instrument 1 (pen tip component 2) has a writing direction specification in the writing section 22 of the pen tip 11, as long as the position of the guide part 41, which serves as the clamping part to guide the position of the finger on the outer cylinder 14, can be adjusted relative to the writing section 22 of the pen tip 11. Therefore, the writing instrument 1 (pen tip component 2) is not limited to a fountain pen and can be applied to various writing instruments.

[0077] Furthermore, even when the writing section 22 of the pen tip 11 does not specify a writing direction, a structure that adjusts the position of the outer cylinder 14 circumferentially relative to the inner cylinder 13 can be applied. The writing instrument described above, for example, has a continuous appearance design for the inner cylinder 13 and the outer cylinder 14, and this design works effectively when aligned. For example, a design with a decorative effect can be cited as an example of the appearance design described above. Another example of the appearance design described above is that arrows, dots, etc., are provided on the outer surface of the base 31 of the inner cylinder 13, and the color of the ink is displayed on the outer cylinder 14. By aligning the positions of the inner cylinder 13 and the outer cylinder 14 with the corresponding ink positions, information indicating the ink color can be displayed.

[0078] Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from its spirit during implementation. Additionally, the various embodiments can be appropriately combined to achieve combined effects. Moreover, the above embodiments include various inventions, and various inventions can be extracted by selecting combinations from the disclosed multiple constituent elements. For example, if the problem can be solved and the effect obtained even if several constituent elements are deleted from all the constituent elements shown in the embodiments, the structure after deleting those constituent elements can be extracted as an invention.

[0079] Explanation of the label

[0080] 1…writing instrument, 2…pen tip component, 11…pen tip, 12…pen refill, 13…inner cylinder, 14…outer cylinder, 15…fixture, 16…cylinder, 17…ink can, 18…seal, 21…pen body, 22…writing part, 23…pen tip, 24…core hole, 25…slit, 31…base, 32…external thread, 33…protrusion, 34…fixture, 41…guide, 42…groove, 51…internal thread, 52…protrusion, 61…internal thread, 100…paper, 100a…paper surface.

Claims

1. A writing instrument, comprising: The pen tip has a writing section, and the writing direction of the writing section is specified. A cylindrical inner tube that secures the pen tip; A cylindrical outer cylinder into which the inner cylinder can be inserted, and a finger guide on the outer circumferential surface; A fastener that secures the outer cylinder to the inner cylinder; and The cylindrical body, which is fixed to the inner cylinder, The inner cylinder has: a seat portion formed at one end, abutting against one axial end of the outer cylinder; and an external thread portion formed at the other end. The fastener is formed as a cylinder that abuts against the other end of the outer cylinder. It has an internal thread on its inner circumferential surface that engages with the external thread. By engaging the internal thread with the external thread, it abuts against the other end of the outer cylinder in the axial direction, thereby restricting the axial movement of the outer cylinder. The inner cylinder has multiple protrusions formed on a portion of the outer peripheral surface opposite the outer cylinder between the seat portion and the external threaded portion, and are arranged circumferentially. The outer cylinder has multiple recesses formed on the inner circumferential surface opposite to the multiple protrusions. When the movement of the outer cylinder is restricted by the fastener, the recesses engage with the multiple protrusions in the circumferential direction. The multiple recesses are configured to accommodate the multiple protrusions in the circumferential direction.

2. The writing instrument according to claim 1, wherein, The plurality of protrusions and the plurality of recesses extend along the axial direction.

3. The writing instrument according to claim 2, wherein, The number of protrusions is less than the number of depressions. The recesses are arranged at equal intervals in the circumferential direction.

4. A pen tip component, comprising: The pen tip has a writing section, and the writing direction of the writing section is specified. The inner cylinder secures the pen tip. An outer cylinder, disposed on the outer periphery of the inner cylinder, is movable circumferentially relative to the inner cylinder; and A fastener secures the outer cylinder to the inner cylinder. The inner cylinder has: a seat portion formed at one end, abutting against one axial end of the outer cylinder; and an external thread portion formed at the other end. The fastener is formed as a cylinder that abuts against the other end of the outer cylinder. It has an internal thread on its inner circumferential surface that engages with the external thread. By engaging the internal thread with the external thread, it abuts against the other end of the outer cylinder in the axial direction, thereby restricting the axial movement of the outer cylinder. The inner cylinder has multiple protrusions formed on a portion of the outer peripheral surface opposite the outer cylinder between the seat portion and the external threaded portion, and are arranged circumferentially. The outer cylinder has multiple recesses formed on the inner circumferential surface opposite to the multiple protrusions. When the movement of the outer cylinder is restricted by the fastener, the recesses engage with the multiple protrusions in the circumferential direction. The multiple recesses are configured to accommodate the multiple protrusions in the circumferential direction.

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