WO2022138534A1

WO2022138534A1 - Writing implement

Info

Publication number: WO2022138534A1
Application number: PCT/JP2021/046939
Authority: WO
Inventors: 大介坂元; 耕輔原田
Original assignee: 株式会社パイロットコーポレーション
Priority date: 2020-12-24
Filing date: 2021-12-20
Publication date: 2022-06-30
Also published as: CN220314575U; JPWO2022138534A1; TW202229024A

Abstract

Provided is a writing implement in which the pen tip is supported in a tiltable manner so that the entire pen tip makes contact with a paper surface, and which makes it possible to relatively easily draw a straight line as intended.　The front portion of the pen tip extends in a linear direction that is tilted at an acute angle with respect to the axis direction in a side view, and the cross section of the front portion of the pen tip with respect to the extending direction has a substantially rectangular shape. A holding member has a holding portion that surrounds at least a part of the front portion of the pen tip. The holding portion has openings that are provided on both longer dimension sides of the substantially rectangular cross section of the front portion of the pen tip. The vertex portion of the pen tip is formed to be substantially straight in a side view, and is substantially perpendicular to the extending direction of the front portion of the pen tip. The back end edge of each of the openings is formed to be substantially straight in a side view, and is substantially parallel to the vertex portion of the pen tip. The holding portion has an extending piece that extends in a direction substantially parallel to the extending direction of the front portion of the pen tip and that is provided on a shorter dimension side of the substantially rectangular cross section of the front portion of the pen tip, said shorter dimension side being on the inner side in a side view.

Description

Stationery

The present invention relates to a writing tool. More specifically, the present invention relates to a writing tool (marking pen or the like) including a pen tip and a holding member for holding the pen tip.

For example, Patent Document 1 discloses a writing instrument in which the entire writing portion is tiltably supported so as to come into contact with the writing surface due to the force applied to the barrel during writing. Since the pen body tilts so that the entire writing part comes into contact with the writing surface, it is possible to easily draw a line with a certain width.

The applicant of the present invention discloses in Patent Document 2 a writing tool that can surely obtain a certain line width by surely contacting the entire writing part with the paper surface.

11 is a side view of the writing tool 101 according to Patent Document 2, FIG. 12 is an enlarged view of a main part of FIG. 11, FIG. 13 is an enlarged perspective view of a main part of FIG. 12, and FIG. 14 is a view. 12 is a vertical cross-sectional view.

As shown in FIGS. 11 to 14, the writing tool 101 according to Patent Document 2 includes a pen tip 102 and a holding member 103 that holds the pen tip 102. and,
The front portion 123 of the pen tip 102 extends in the axial direction, and
The cross section of the front portion 123 of the pen tip 102 with respect to the extending direction has a substantially rectangular shape.
The tip of the holding member 103 has a holding portion 131 that surrounds the front portion 123 of the pen tip 102.
The holding portion 131 is provided with a notch-shaped opening 133 on both long sides of a substantially rectangular cross section of the front portion 123 of the pen tip 102.
The top portion 122 of the pen tip 102 is formed in a substantially linear shape in a side view, and has an acute angle with respect to the extending direction of the front portion 123 of the pen tip 102.
The trailing edge 134 of the opening 133 is formed substantially linearly in a side view and is parallel to the top 122 of the pen tip 102.
The holding portion 131 is a pair of extensions extending in a direction substantially parallel to the extending direction of the front portion 123 of the pen tip 102 on both short sides of a substantially rectangular shape in the cross section of the front portion 123 of the pen tip 102. It has a piece 135.

The notch-shaped opening 133 allows the pen tip 102 to bend and deform toward the long side during writing. As a result, the entire writing section comes into contact with the paper surface, and a constant line width can be reliably obtained. Further, the contact of the pair of extension pieces 135 with the paper surface can promote writing at the writing pressure as designed, and can prevent excessive bending (and thus damage) of the pen tip 102.

Japanese Unexamined Patent Publication No. 2005-297540 Japanese Unexamined Patent Publication No. 2019-155879

The writing tool according to Patent Document 2 has the above-mentioned advantages, but the inventor of the present invention has found the following improvements.

That is, as shown in FIG. 15, when drawing a straight line using a ruler, the pen tip 102 is unstable because the inner extension piece 135 comes into contact with the ruler at an angle. Therefore, it may not be easy to draw a straight line as intended.

Alternatively, as shown in FIG. 16, when drawing a straight line without using a ruler, the top 122 of the pen tip 102 is directed with respect to the extension direction of the front portion 123 (and the pair of extension pieces 135) of the pen tip 102. Since the pen tip 102 has a sharp angle, the direction A for bending the pen tip 102 (sinking into the paper surface) and the direction B for moving the pen tip 102 form a sharp angle (intersect in a plan view). As a result, it may not be easy to draw a straight line as intended.

The present invention has been made in view of the above findings. An object of the present invention is a writing tool in which the entire pen tip is tiltably supported so as to come into contact with the paper surface, and when drawing a straight line with a ruler and when drawing a straight line without using a ruler. Is to provide a writing tool that is relatively easy to draw a straight line as intended.

The present invention
With the pen tip
A holding member that holds the pen tip and
It is a stationery equipped with
The front portion of the pen tip extends in a straight line direction that is inclined at an acute angle in the side view with respect to the axial direction.
The cross section of the front portion of the pen tip with respect to the extension direction has a substantially rectangular shape.
The holding member has a holding portion that surrounds at least a part of the front portion of the pen tip.
The holding portion is provided with openings on both long sides of a substantially rectangular shape of the cross section of the front portion of the pen tip.
The top of the pen tip is formed in a substantially linear shape in a side view, and is substantially perpendicular to the extension direction of the front portion of the pen tip.
The trailing edge of the opening is formed in a substantially linear shape in a side view, and is substantially parallel to the top of the pen tip.
The holding portion is a substantially rectangular short side of the cross section of the front portion of the pen tip, and is on the short side inward in a side view, in the extending direction of the front portion of the pen tip. It is a writing tool characterized by having an extension piece extending in a direction substantially parallel to the above.

According to the present invention, the extension piece extends in a direction substantially parallel to the extension direction of the front portion of the pen tip. Therefore, when drawing a straight line using a ruler, the extension piece can make line contact or surface contact with the ruler, and the pen tip is stable (see FIG. 7). Therefore, it becomes easy to draw a straight line as intended. Further, even when a straight line is drawn without using a ruler, the direction in which the pen tip is bent (sinked with respect to the paper surface) and the direction in which the pen tip is moved coincide with each other in a plan view (see FIG. 8). Therefore, it becomes easy to draw a straight line as intended.

Preferably, the holding portion extends in a direction substantially parallel to the extending direction of the front portion of the pen tip on both short sides of a substantially rectangular shape of the cross section of the front portion of the pen tip. Has a pair of extension pieces.

In this case, the contact of the pair of extension pieces with the paper surface can more effectively promote writing at the pen pressure as designed, and more effectively prevent excessive bending (and thus damage) of the pen tip. Can be prevented.

Further, preferably, the connection portion on the rear side of the front portion continuous with the front portion of the pen tip extends substantially in the axial direction.

According to this, it is possible to change the design of only the front part of the pen tip and the holding part of the holding member surrounding it from the conventional writing tool.

In this case, more preferably, the connection portion of the pen tip is provided with a diaphragm portion whose cross section changes with respect to the axial direction.

According to this, the work of inserting the pen tip into the holding member can be facilitated (see FIG. 5).

Further, preferably, the width of the opening is larger than the width on the long side of the substantially rectangular shape of the cross section of the front portion of the pen tip.

According to this, since the front part of the pen tip is not pressed against the inner surface of the extension piece at the time of writing, it can be more reliably bent and deformed to the long side side, and the entire pen tip is the paper surface regardless of the angle of the pen tip with respect to the paper surface. A constant line width is surely obtained.

Further, preferably, a shaft cylinder connected to the holding member is further provided, a rear portion of the holding member is attached to a front portion of the shaft cylinder, and a first contact wall is provided on the inner surface of the holding member. A second contact wall portion is formed on the inner surface of the barrel, and the outer surface of the pen tip is formed by the first contact wall portion and the second contact wall portion. It is sandwiched in the front-back direction.

According to this, it is possible to effectively prevent the pen tip from falling off from the holding member or burying the pen tip in the holding member, and further, the amount of protrusion of the pen tip from the holding member can be accurately maintained. be able to.

Further, preferably, the pen tip is either a fiber pen tip, a felt-tip pen tip, a pen tip made of a porous body having open cells, or a plastic pen tip having an axial capillary passage.

According to this, the pen tip can have the desired flexibility. Therefore, the pen tip can be flexed and deformed more reliably toward the long side, and the entire pen tip comes into contact with the paper surface regardless of the angle of the pen tip with respect to the paper surface, so that a constant line width can be reliably obtained.
Further, preferably, a chamfered portion is provided on the tip end portion of the front portion of the pen tip on a side inclined at an acute angle in a side view.
According to this, it is possible to effectively suppress the defect or peeling at the tip portion on the side (inward side) inclined at an acute angle at the front portion of the pen tip. In particular, when the pen tip is a fiber pen tip, the fibers are arranged in the axial direction in the manufacturing process, so if the tip on the inner side of the front part of the pen tip is perpendicular, that part will be It becomes an aggregate of short fibers and becomes very brittle. By providing the chamfered portion in the portion, the fibers constituting the portion become longer, so that the brittleness is remarkably reduced and the chipping and peeling can be effectively suppressed. Even when the pen tip is a pen tip made of a porous body having open cells, if the tip on the inner side of the front portion of the pen tip is at a right angle, that portion becomes very fragile. Even in this case, by providing the chamfered portion in the portion, the brittleness of the portion is remarkably reduced, and the chipping and peeling can be effectively suppressed.

It is a vertical sectional view which shows the writing tool by one Embodiment of this invention. It is an enlarged view of the main part of FIG. 3A is a side view of the pen tip of FIG. 1, and FIG. 3B is a perspective view. 4 (a) is a side view of the holding member of FIG. 1, and FIG. 4 (b) is a perspective view. It is a schematic side view of the state in which the pen tip of FIG. 3 is being inserted into the holding member of FIG. 6 (a) is a side view of a state in which the pen tip of FIG. 3 is inserted into the holding member of FIG. 4, and FIG. 6 (b) is a perspective view. It is explanatory drawing in the case of drawing a straight line with a ruler by the writing tool by this embodiment, FIG. 7A is a schematic perspective view, FIG. 7B is a schematic front view, and FIG. 7 (a) c) is a schematic plan view. It is explanatory drawing in the case of drawing a straight line by the writing tool by this embodiment without using a ruler, FIG. 8A is a schematic perspective view, and FIG. 8B is a schematic plan view. 9 (a) is a side view of a modified example of the pen tip, and FIG. 9 (b) is a perspective view. It is a side view of the modification of the holding member. It is a side view of the writing tool by patent document 2. FIG. It is an enlarged view of the main part of FIG. FIG. 12 is an enlarged perspective view of a main part of FIG. It is a vertical sectional view of FIG. It is explanatory drawing in the case of drawing a straight line with a ruler by the writing tool by Patent Document 2, FIG. 15 (a) is a schematic perspective view, FIG. 15 (b) is a schematic front view, and FIG. 15 ( c) is a schematic plan view. It is explanatory drawing in the case of drawing a straight line without using a ruler by the writing tool according to Patent Document 2, FIG. 16 (a) is a schematic perspective view, and FIG. 16 (b) is a schematic plan view. FIG. 17A is a side view of the pen tip of the writing tool according to the second embodiment of the present invention, and FIG. 17B is a perspective view. 18 (a) is a side view of a holding member of a writing tool according to a third embodiment of the present invention, and FIG. 18 (b) is a perspective view. It is explanatory drawing in the case of drawing a straight line with a ruler by the writing tool according to 3rd Embodiment of this invention, FIG. 19A is a schematic perspective view, and FIG. 19B is a schematic front view. .. 20 (a) is a side view of a holding member of a writing tool according to a fourth embodiment of the present invention, and FIG. 20 (b) is a perspective view. It is explanatory drawing in the case of drawing a straight line with a ruler by the writing tool according to 4th Embodiment of this invention, FIG. 21A is a schematic perspective view, and FIG. 21B is a schematic front view. .. 22 (a) is a side view of the pen tip of the writing tool according to the fifth embodiment of the present invention, and FIG. 22 (b) is a perspective view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a vertical cross-sectional view showing a writing tool 1 according to the present embodiment, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3A is a side view of a pen tip 2 of FIG. 3 (b) is a perspective view of the pen tip 2 of FIG. 1, FIG. 4 (a) is a side view of the holding member 3 of FIG. 1, and FIG. 4 (b) is a holding of FIG. It is a perspective view of a member. Further, FIG. 5 is a schematic side view of a state in which the pen tip 2 of FIG. 3 is being inserted into the holding member 3 of FIG. 4, and FIG. 6A shows the holding of the pen tip 2 of FIG. 3 in FIG. It is a side view of the state inserted into the member 3, and FIG. 6B is a perspective view thereof.

(overall structure)
As shown in FIGS. 1 to 6, the writing tool 1 according to the present embodiment includes a pen tip 2 and a holding member 3 for holding the pen tip 2. Further, the writing tool 1 according to the present embodiment further includes an ink storage body 6 and a front shaft 4 and a rear shaft 5 in which the ink storage body 6 is housed. The holding member 3 is press-fitted to the front shaft 4.

(Pen tip 2)
The pen tip 2 is composed of a fiber pen tip (resin processed body of a fiber bundle). However, the pen tip 2 may be any one as long as the ink can be distributed and has flexibility. Specifically, the pen tip 2 is a porous body of synthetic resin having open cells, a felt-tip pen tip, a brush pen tip, and an axial direction. Examples thereof include a plastic pen tip having a capillary passage.

Then, the front portion 23 of the pen tip 2 extends in a straight line direction inclined at an acute angle (30 ° in this embodiment) in the side view with respect to the axial direction. The cross section of the front portion 23 of the pen tip 2 with respect to the extending direction has a substantially rectangular shape (long side 4.5 mm, short side 1 to 3 mm). The extension length (length that maintains a substantially rectangular cross section) is 2.6 mm in this embodiment.

The front portion 23 of the pen tip 2 is sandwiched (partially surrounded) by a pair of extension pieces 35 of the holding member 3 described later, and the top portion 22 of the pen tip 2 is the tip portion of the holding member 3. It slightly protrudes forward (diagonally forward) from. The top portion 22 of the pen tip 2 is formed in a substantially linear shape in a side view, and is perpendicular to the extending direction of the front portion 23 of the pen tip 2.

Here, it is preferable that the top portion 22 of the pen tip 2 has a convex curved surface-shaped R shape. In the writing tool 1 of the present embodiment, when the pen tip 2 bends, the entire pen tip 2 comes into contact with the paper surface regardless of the angle of the pen tip 2 with respect to the paper surface, and a constant line width can be reliably obtained. Therefore, it is preferable that the top 22 has an R shape in order to ensure that the top 22 is in contact with the paper surface.

Further, on the side where the front portion 23 of the pen tip 2 is inclined at an acute angle in the side view with respect to the axial direction, a notch 23d is provided in at least one of the front portion 23 or the connection portion 23b of the pen tip 2. As a result, the shape of the pen tip in which the front portion 23 of the pen tip 23 extends in a linear direction inclined at an acute angle in the side view with respect to the axial direction can be easily formed by grinding or punching.

On the other hand, the connecting portion 23b on the rear side of the front portion 23 continuous with the front portion 23 of the pen tip 2 extends substantially in the axial direction. However, the connection portion 23b is provided with a throttle portion 23c whose cross section changes with respect to the axial direction. The front end side of the squeezing portion 23c is continuous with the front portion 23 of the pen tip 2 (the cross section of the front portion 23 of the pen tip 2 with respect to the extending direction is substantially rectangular), and the rear end side of the squeezing portion 23c is It has a substantially square columnar shape (the cross section in the axial direction is approximately rectangular). That is, the connecting portion 23b on the rear side of the front portion 23 has a substantially rectangular cross section. Further, the drawing portion 23c is at least a part of the notch 23d, and the drawing portion 23c can also be easily processed by grinding, punching, or the like.

Further, on the rear side of the connecting portion 23b of the pen tip 2, a cylindrical (large diameter) central portion 24 whose outer surface is sandwiched in the front-rear direction by the holding member 3 and the front shaft 4, and the front end of the ink storage body 6. A cylindrical (small diameter) rear end portion 25, which is connected to the portion in a piercing manner, is provided.

(Holding member 3)
The holding member 3 is a tubular body obtained by injection molding of a synthetic resin with both ends opened. As shown in FIGS. 3 to 6, the pen tip 2 is fitted (locked to prevent it from coming off in the axial direction) from the rear side in the holding member 3.

A plurality of (here, four) inner surface ribs extending in the axial direction into which the central portion 24 of the pen tip 2 is press-fitted are formed at equal intervals on the inner surface having a circular cross-sectional shape at the rear end of the holding member 3. ing. On the other hand, a plurality of (6 in this case) outer surface ribs extending in the axial direction to be press-fitted to the front shaft 4 are formed at equal intervals on the outer surface having a circular cross-sectional shape at the rear end of the holding member 3. .. Since the rear end portion of the holding member 3 has a circular cross-sectional shape, when the holding member 3 and the front shaft 4 are fitted, the outer surface of the holding member fitting portion of the front shaft 4 has a circular cross-sectional shape. A reliable airtight fit between the inner surface of the cap and the outer surface of the front shaft 4 can be obtained. The communication hole formed by the outer surface rib and the front shaft 4 functions as an air flow hole, and enables smooth ink ejection from the pen tip 2.

As shown in FIGS. 1 to 6, the holding member 3 has a holding portion 31 having a substantially rectangular cross section that substantially surrounds the front portion 23 and the connecting portion 23b of the pen tip 2. Since the connection portion 23b of the pen tip 2 described above has a substantially rectangular cross section and the holding portion 31 of the holding member 3 has a substantially rectangular cross section, the pen tip 2 is inserted into the holding member 3. It is a guide that can be aligned in the rotation direction (circumferential direction) when assembling. As a result, the directions of the pen tip 2 and the holding member 3 in the rotation direction can be easily aligned. A notch-shaped opening 33 is provided on both long sides of the substantially rectangular shape of the cross section of the front portion 23 of the pen tip 2.

The width of the opening 33 is larger than the width of the long side of the substantially rectangular cross section of the front portion 23 of the pen tip 2.

When not writing, the pen tip 2 is located on the axis of the writing tool 1. On the other hand, at the time of writing, the pen tip 2 can be bent and deformed toward the opening 33 side (long side side) and deviated from the axis of the writing tool 1. As a result, the entire top 22 of the pen tip 2 can come into contact with the paper surface regardless of the angle between the axis of the writing tool 1 and the paper surface, and a constant line width can be reliably obtained at all times.

Further, the top portion 22 of the pen tip 2 is formed substantially linearly in a side view, extends in a direction perpendicular to the extending direction of the front portion 23 of the pen tip 2, and is the rear end of the opening 33. The edge portion 34 is also formed in a substantially linear shape in a side view, and extends in a direction parallel to the top portion 22 of the pen tip 2. As a result, the load on the pen tip 2 due to the bending of the pen tip 2 is uniformly applied to the front portion 23 of the pen tip 2, local stress concentration of the pen tip 2 is avoided, and the life of the pen tip 2 is extended. Is planned.

Further, since the shape of the side view of the pen tip 2 exposed from the holding member 3 is rectangular, the direction of the pen tip 2 can be grasped by the direction of the rear end edge portion 34. Therefore, after exposing the pen tip 2, it can be used for writing immediately.

Here, at least at the time of filing the application, an embodiment in which the opening 33 is provided only on the side wall on one side of the holding portion 31 is also an aspect of the present invention. However, when the openings 33 are provided on both side walls, the desired bending effect can always be exhibited regardless of whether the user is right-handed or left-handed, which is excellent in convenience.

Further, the holding portion 31 of the present embodiment is anterior to the rear end edge portion 34 of the opening 33 (rear end edge portion 34) on both short sides of the substantially rectangular shape of the cross section of the front portion 23 of the pen tip 2. It has a pair of extension pieces 35 (inner extension piece 35a and outer extension piece 35b) protruding in the vertical direction of the above. The pair of extension pieces 35 extend in a direction parallel to the extension direction of the front portion 23 of the pen tip 2, and come into contact with the paper surface during writing.

By contacting the pair of extension pieces 35 with the paper surface, it is possible to prevent the pen tip 2 from being broken or damaged due to excessive bending, and to bring the entire pen tip 2 into contact with the paper surface.

It is preferable that each of the pair of extension pieces 35 is tapered toward the front (vertical direction of the rear end edge portion 34), and a convex curved surface is formed at the front end thereof.

Further, when a pair of extension pieces 35 come into contact with the paper surface, when a line is drawn on the paper surface using a ruler or the like, the inner extension pieces 35 can make line contact or surface contact with the ruler or the like. , The pen tip 2 is stable (see FIG. 7). Therefore, it is easy to draw a line as intended. Further, since the pen tip 2 does not come into contact with the ruler or the like, it is possible to prevent the ruler or the like from being soiled by ink, and conversely, the handwriting at the time of writing due to the dirt adhering to the ruler or the like being transferred to the pen tip 2. You can also prevent dirt.

Further, even when drawing a line without using a ruler or the like, the direction A in which the pen tip 2 is bent (sinked with respect to the paper surface) and the direction B in which the pen tip 2 is moved coincide with each other in a plan view (FIG. 8). Therefore, it is easy to draw a line as intended.

Further, since the holding member 3 has a pair of extension pieces 35, when the pen tip 2 is inserted into the cap or the like of the writing tool 1, the pen tip 2 comes into contact with the inner surface of the cap to prevent ink from adhering to the inner surface of the cap. Can be prevented. When the ink adheres to the inner surface of the cap, the ink adhered to the inner surface of the cap may be transferred and adhered to the outer surface of the front shaft 4 when the cap is fitted to the writing tool 1. As a result, when the user removes the cap again and grips the front shaft 4 of the writing tool 1, there is a risk that the hand will be soiled with ink.

Further, since the holding member 3 has the inward extending piece 35a, the inward extending piece 35a and the step formed by the front portion 23 of the pen tip and the notch 23d (throttle portion 23c) are in the axial direction. It is locked to prevent it from coming off. As a result, more stable fitting of the pen tip 2 and the holding member 3 can be realized.

Further, the top portion 22 of the pen tip 2 protrudes from the tips of the pair of extension pieces 35 in the extension direction, and the amount of protrusion thereof is larger than 0.2 mm and smaller than 5.0 mm, preferably 0.5 mm or more. It is effective that it is large and smaller than 2.0 mm. The smaller the amount of protrusion within the preferred range, the more rigid and firm the brush feeling is obtained, and the larger the amount of protrusion within the preferred range, the softer the brush feeling is obtained.

Further, it is preferable that the rear end edge portion 34 is provided with a chamfer or R. In particular, it is preferable that chamfering or R is provided at least on the edge on the pen tip 2 side where the pen tip 2 may come into contact. As a result, even when the pen tip 2 is excessively bent and comes into contact with the rear end edge portion 34, the load applied to the front portion 23 of the pen tip 2 can be minimized, and the pen tip 2 is less likely to be broken or damaged. It can be effectively prevented.

At least at the time of filing the application of the present application, a mode in which the extension piece 35 is provided only on the inner short side in a side view (that is, a mode in which only the inner extension piece 35a is provided) is also an aspect of the present invention.

Further, it is preferable that the color of the holding member 3 is different from the color of the pen tip 2 (that is, the ink color). As a result, the orientation of the rear end edge portion 34 becomes more conspicuous, and it becomes easier to confirm the orientation of the pen tip 2. In particular, when the pen tip 2 itself is colored with a dark color such as black and the holding member 3 is colored with a bright color different from that of the pen tip 2, the direction of the trailing end edge portion 34 becomes more conspicuous, and the pen tip 2 becomes more prominent. It becomes easier to check the shape.

Further, the holding member 3 may be entirely made of a transparent material or a translucent material. In this case, the color of the ink becomes easy to see. In addition, it is possible to provide an excellent form in terms of design (aesthetics).

Alternatively, only the region near the front end of the holding member 3 may be colored, and the rest may be made of a transparent material or a translucent material. This aspect has an effect of facilitating grasping the relative position between the writing instrument and the writing object when the color of the writing object (for example, the paper surface) and the color of the ink are similar.

(Front axle 4)
The front shaft 4 is a tubular body obtained by injection molding or extrusion molding of a synthetic resin with both ends open. As shown in FIGS. 1 and 2, the outer surface (outer surface rib) of the rear end portion of the holding member 3 is press-fitted to the inner surface of the front end portion of the front shaft 4.

Further, on the rear inner peripheral surface of the front shaft 4, a plurality of (here, eight) vertical ribs 43 extending in the axial direction are integrally formed at equal intervals. The central portion 24 of the pen tip 2 is sandwiched in the front-rear direction by the first contact wall portion 36 of the holding member 3 and the second contact wall portion 41 at the front end of the vertical rib 43.

As a result, it is possible to prevent the pen tip 2 from falling off from the holding member 3 or being buried in the holding member 3 (front shaft 4), and accurately regulate the amount of protrusion of the pen tip 2 from the holding member 3. be able to. Further, the front end portion of the ink storage body 6 is sandwiched in the front-rear direction between the third contact wall portion 42 at the rear end of the vertical rib 43 and the bottom wall of the shaft cylinder 5 described later.

(Rear axle 5)
The rear shaft 5 connected to the rear end of the front shaft 4 is a cylindrical bottomed cylinder composed of a bottom wall and a peripheral wall, the front end being opened and the rear end being closed, and a synthetic resin (for example, for example). Obtained by injection molding of polypropylene, etc.). The front shaft 4 is airtightly fitted to the rear shaft 5 by screwing or press fitting.

(Ink occlusion body 6)
The ink storage body 6 is made of a member having continuous pores capable of impregnating ink. For example, a heat-sealed body of a fiber bundle, a resin processed body of a fiber bundle, a resin processed body of a felt, a needle punched body of a felt, a porous body (for example, an open cell of a synthetic resin such as a sponge), etc. Can be mentioned. Further, the ink storage body 6 may have an outer skin made of a synthetic resin film or the like on the outer peripheral surface thereof.

(Action effect)
The writing instrument 1 having the above configuration can exert the following effects. That is, according to the writing tool 1 of the present embodiment, since the extension piece 35 extends in a direction substantially parallel to the extension direction of the front portion 23 of the pen tip 2, when drawing a line using a ruler, The extension piece 35 can make line contact or surface contact with the ruler, and the pen tip 2 is stable (see FIG. 7). Therefore, it becomes easy to draw a line as intended.

Further, according to the writing tool 1 of the present embodiment, the direction A for bending the pen tip 2 (sinking into the paper surface) and the direction B for moving the pen tip 2 even when drawing a line without using a ruler. Matches in a plan view (see FIG. 8). Therefore, it becomes easy to draw a line as intended.

Further, the holding portion 31 of the writing tool 1 of the present embodiment is substantially parallel to the extending direction of the front portion 23 of the pen tip 2 on both short sides of the substantially rectangular shape of the cross section of the front portion 23 of the pen tip 2. It has a pair of extension pieces 35 extending in various directions. Therefore, the contact of the pair of extension pieces 35 with the paper surface can more effectively promote writing at the writing pressure as designed, and further prevent excessive bending (and thus damage) of the pen tip 2. It can be effectively prevented.

Further, according to the writing tool 1 of the present embodiment, the connecting portion 23b on the rear side of the front portion 23 continuous with the front portion 23 of the pen tip 2 extends substantially in the axial direction. As a result, it is sufficient to change the design of only the front portion 23 of the pen tip 2 and the holding portion 31 of the holding member 3 surrounding the pen tip 2 from the conventional writing tool 101.

Further, according to the writing tool 1 of the present embodiment, the connecting portion 23b of the pen tip 2 is provided with a diaphragm portion 23c whose cross section changes with respect to the axial direction. This can facilitate the work of inserting the pen tip 2 into the holding member 3 (see FIG. 5).

However, at least at the time of filing the application of the present application, an aspect in which the throttle portion 23c is not provided is also an aspect of the present invention. That is, as shown in FIG. 9A, the pen tip 2'may have a constant cross section with respect to the axial direction in the entire connecting portion 23b'. The holding member 3'corresponding to this has a form as shown in FIG. Further, as shown in FIG. 9B, the top portion 22 of the pen tip 2'may have a rectangular writing surface. This makes it easier to process the shape of the top 22 of the pen tip 2'.

Further, according to the writing tool 1 of the present embodiment, the width of the opening 33 is larger than the width on the long side of the substantially rectangular shape of the cross section of the front portion 23 of the pen tip 2. As a result, the pen tip 2 can be reliably bent and deformed toward the long side during writing, and the entire pen tip 2 comes into contact with the paper surface regardless of the angle of the pen tip 2 with respect to the paper surface, and a constant line width is surely obtained. Be done.

Further, according to the writing tool 1 of the present embodiment, the front shaft 4 connected to the holding member 3 is further provided, the rear portion of the holding member 3 is attached to the front portion of the front shaft 4, and the inner surface of the holding member 3 is provided. A first contact wall portion 36 is formed in the front shaft 4, and a second contact wall portion 51 is formed on the inner surface of the front shaft 4. The first contact wall portion 36 and the second contact wall portion 41 form a second contact wall portion 51. The outer surface of the pen tip 2 is sandwiched in the front-rear direction. This makes it possible to effectively prevent the pen tip 2 from falling off from the holding member 3 or burying the pen tip 2 in the holding member 3, and further, the amount of protrusion of the pen tip 2 from the holding member 3 can be prevented. Can be maintained accurately.

The pen tip 2 is either a fiber pen tip (resin processed body of a fiber bundle), a felt-tip pen tip, a pen tip made of a porous body having open cells, or a plastic pen tip having an axial capillary passage. Is it? According to this, the pen tip 2 can have the desired flexibility. Therefore, the pen tip 2 can be flexed and deformed more reliably toward the long side, and the entire pen tip 2 comes into contact with the paper surface regardless of the angle of the pen tip 2 with respect to the paper surface, so that a constant line width can be reliably obtained.

(Second Embodiment)
FIG. 17A is a side view of the pen tip 202 of the writing tool according to the second embodiment of the present invention, and FIG. 17B is a perspective view of the pen tip 202. As shown in FIGS. 17A and 17B, the pen tip 202 of the second embodiment has a plate-shaped substantially rectangular parallelepiped shape in the front portion 223 due to the provision of the notch 223d. The top 222 is a flat surface and is not provided with a convex curved R shape.

The front portion 223 of the pen tip 202 extends in a linear direction inclined at an acute angle (30 ° in this embodiment) in the side view with respect to the axial direction, substantially similar to the front portion 23 of the pen tip 2 of the above-described embodiment. It is out. The cross section of the front portion 223 of the pen tip 202 with respect to the extending direction has a substantially rectangular shape (long side 4.5 mm, short side (thickness) 1.5 mm). The extension length (length that maintains a substantially rectangular cross section) is 2.5 mm in this embodiment.

The front portion 223 of the pen tip 202 is sandwiched (partially surrounded) by a pair of extension pieces of the corresponding holding member (not shown), and the top 222 of the pen tip 202 is the tip of the holding member. It slightly protrudes forward (diagonally forward) from the part. The top portion 222 of the pen tip 202 is formed in a substantially linear shape in a side view, and is perpendicular to the extending direction of the front portion 223 of the pen tip 202.

Here, since the top 222 of the pen tip 202 does not have a convex curved R shape and has a flat surface, the top 222 is compared with the top 22 of the pen tip 2 of the above-described embodiment. , The contact area with the paper surface is small at the time of writing. As a result, when the pen tip 202 is separated from the paper surface after writing is finished, the degree of "ink pool" that may be formed on the paper surface is suppressed.

Further, in the present embodiment, the notch 223d is provided on the side where the front portion 223 of the pen tip 202 is inclined at an acute angle in the side view with respect to the axial direction so that the front portion 223 of the pen tip 202 has a substantially rectangular parallelepiped shape. Has been done. Here, in the present embodiment shown in FIGS. 17 (a) and 17 (b), the front end of the notch 223d is located slightly behind the top 222, so that the front portion 223 of the pen tip 202 is complete. Although it does not have a rectangular parallelepiped shape, the position of the front end of the notch 223d may be aligned with the top portion 222, and the front portion 223 of the pen tip 202 may have a perfect rectangular parallelepiped shape.

On the other hand, the connecting portion 223b on the rear side of the front portion 223, which is continuous with the front portion 223 of the pen tip 202, extends substantially in the axial direction. The connection portion 223b of the present embodiment has a plate shape having the same thickness as the front portion 223, but has a throttle portion 223c whose cross section changes with respect to the axial direction, and a throttle portion 223c extending rearward from the rear end of the throttle portion 223c and gradually extending to the rear side. Includes a transition portion 223e that increases in thickness and a rear portion 223f that extends from the rear end of the transition portion 223e to the rear side with a certain thickness, and is a boundary between the throttle portion 223c and the transition portion 223e. Both the line and the boundary line between the transition portion 223e and the rear portion 223f are parallel to the top portion 222. Here, the change in the cross section of the throttle portion 223c with respect to the axial direction can be relatively easily processed into a desired shape by forming the notch 223d by grinding, punching, or the like.

Further, in the present embodiment shown in FIGS. 17 (a) and 17 (b), the cross section by the surface including the boundary line between the narrowing portion 223c and the transition portion 223e has a substantially rectangular shape (long side 5.8 mm, long side 5.8 mm, The short side (thickness) is 1.5 mm), and the cross section formed by the surface including the boundary line between the transition portion 223e and the rear portion 223f is substantially rectangular (long side 5.8 mm, short side (thickness) 3). .2 mm).

In addition, as in the above-described embodiment, on the rear side of the connecting portion 223b of the pen tip 202 (rear side of the rear portion 223f), the outer surface is sandwiched in the front-rear direction by the holding member and the front shaft 4 (cylindrical shape). A central portion 224 (large diameter) and a cylindrical (small diameter) rear end portion 225 connected to the front end portion of the ink storage body 6 in a piercing manner are provided.

According to the pen tip 202 of the present embodiment, the narrowing portion 223c of the connecting portion 223b has a plate shape having the same thickness as the front portion 223, and is between the narrowing portion 223c and the transition portion 223e. Because the border is parallel to the top 222 (and the border between the transition 223e and the rear 223f is also parallel to the top 222), the pen tip 202 is at the time of writing. It can be bent more flexibly. Therefore, even if the pen tip 202 has an undesired dimensional variation (especially if it is too long in the axial direction), the risk of damage to the pen tip 202 during writing is significantly suppressed. obtain.

The pen tip 202 is also made of a fiber pen tip (resin processed body of a fiber bundle). The pen tip 202 may also be a pen tip 202 as long as the ink can be distributed and has flexibility. Specifically, a porous body of synthetic resin having open cells, a felt-tip pen tip, a brush pen tip, and an axial capillary passage. A plastic pen tip having a pen tip, etc. may be mentioned.

(Third Embodiment)
FIG. 18A is a side view of the holding member 303 of the writing tool according to the third embodiment of the present invention, and FIG. 18B is a perspective view of the holding member 303. Further, FIG. 19A is a schematic perspective view when a straight line is drawn using a ruler with the writing tool according to the present embodiment, and FIG. 19B is a schematic front view thereof.

As shown in FIGS. 18 (a) to 19 (b), the holding portion 331 of the holding member 303 of the present embodiment is substantially the same as the embodiment described with reference to FIGS. 4 (a) to 6 (b). In addition, on both short sides of the substantially rectangular cross section of the front portion 23 of the pen tip 2, a pair of extensions protruding forward from the rear end edge portion 334 of the opening 333 (in the vertical direction of the rear end edge portion 334). It has a piece (inner extension piece 335a and outer extension piece 335b). The pair of

extension pieces

335a and 335b extend in a direction parallel to the extension direction of the front portion 23 of the pen tip 2, and come into contact with the paper surface during writing.

Here, the inside of each of the pair of

extension pieces

335a and 335b is chamfered by, for example, about 45 ° to form a semi-partially inclined surface 335c of a truncated conical surface. By providing such an inclined surface 335c, the area where each

extension piece

335a, 335b and the paper surface come into contact with each other at the time of writing is reduced (for example, only the width of about 0.2 mm is substantially arcuate (FIG. 19 (a)). ), The pressure applied to the paper surface from the

extension pieces

335a and 335b becomes stronger, and the

extension pieces

335a and 335b are more likely to bite into the paper surface. As a result, it is possible to more effectively prevent the handwriting from shifting in an unintended direction.

For example, as shown in FIGS. 19 (a) and 19 (b), when drawing a line on a paper surface using a ruler or the like, it is even easier to draw the line as intended.

(Fourth Embodiment)
20 (a) is a side view of the holding member 403 of the writing tool according to the fourth embodiment of the present invention, and FIG. 20 (b) is a perspective view of the holding member 403. 21 (a) is a schematic perspective view of a case where a straight line is drawn using a ruler with a writing tool according to the present embodiment, and FIG. 21 (b) is a schematic front view thereof.

As shown in FIGS. 20 (a) to 21 (b), the holding portion 431 of the holding member 403 of the present embodiment is substantially the same as the embodiment described with reference to FIGS. 4 (a) to 6 (b). In addition, on both short sides of the substantially rectangular cross section of the front portion 23 of the pen tip 2, a pair of extensions protruding forward from the rear end edge portion 434 of the opening 433 (in the vertical direction of the rear end edge portion 434). It has a piece (inner extension piece 435a and outer extension piece 435b). The pair of

extension pieces

435a and 435b extend in a direction parallel to the extension direction of the front portion 23 of the pen tip 2, and come into contact with the paper surface during writing.

Here, the inside of each of the pair of

extension pieces

435a and 435b is chamfered by a plurality of (five in the illustrated example) inclined planes 435c. By providing such a plurality of inclined planes 435c, the area where each

extension piece

435a, 435b and the paper surface come into contact with each other at the time of writing is reduced (for example, only the width of about 0.1 mm has a length of about 1.4 mm). (See FIG. 21 (a)), the pressure applied to the paper surface from the

extension pieces

435a and 435b becomes stronger, and the

extension pieces

435a and 435b can easily bite into the paper surface. As a result, it is possible to more effectively prevent the handwriting from shifting in an unintended direction.

For example, as shown in FIGS. 21 (a) and 21 (b), when drawing a line on a paper surface using a ruler or the like, it is even easier to draw the line as intended.

(Fifth Embodiment)
22 (a) is a side view of the pen tip 502 of the writing tool according to the fifth embodiment of the present invention, and FIG. 22 (b) is a perspective view of the pen tip 502.

The front portion 523 of the pen tip 502 extends in a linear direction inclined at an acute angle (30 ° in this embodiment) in the side view with respect to the axial direction, substantially similar to the front portion 23 of the pen tip 2 of the above-described embodiment. It is out. The cross section of the front portion 523 of the pen tip 502 with respect to the extending direction has a substantially rectangular shape (long side 5.0 mm, short side 1 to 3.2 mm). The extension length (the length that maintains a substantially rectangular cross section) is 2.6 mm in this embodiment.

The front portion 523 of the pen tip 502 is sandwiched (partially surrounded) by a pair of extension pieces of the corresponding holding member (not shown), and the top 522 of the pen tip 502 is the tip of the holding member. It slightly protrudes forward (diagonally forward) from the part. The top portion 522 of the pen tip 502 is formed in a substantially linear shape in a side view, and is perpendicular to the extending direction of the front portion 523 of the pen tip 502.

Here, the front portion 523 of the pen tip 502 has a shape in which the thickness decreases toward the top portion 522 side, but the top portion 522 of the pen tip 502 does not have a convex curved R shape. , It is a flat surface. Therefore, the top portion 522 has a smaller contact area with the paper surface at the time of writing than the top portion 22 of the pen tip 2 of the above-described embodiment. This suppresses the degree of "ink pool" that may be formed on the paper surface when the pen tip 502 is separated from the paper surface after writing is completed.

Further, in the present embodiment, the notch 523d is provided on the side where the front portion 523 of the pen tip 502 is inclined at an acute angle in the side view with respect to the axial direction so that the front portion 523 of the pen tip 502 has a substantially rectangular parallelepiped shape. Has been done. Here, in the present embodiment, the front end of the notch 523d is located 1.3 mm behind the inner end of the top 522, and the front end 523 of the pen tip 502 has a perfect rectangular parallelepiped shape. do not have. That is, the chamfered portion 522d is provided on the side (inward side) inclined at an acute angle in the side view of the tip portion of the front portion 523 of the pen tip 502.

This makes it possible to effectively suppress defects and peeling at the tip of the front portion 523 of the pen tip 502 on the side (inward side) inclined at an acute angle. In particular, when the pen tip 502 is a fiber pen tip, the fibers are arranged in the axial direction in the manufacturing process. Therefore, if the tip of the front portion 523 of the pen tip 502 is at right angles. The part becomes an aggregate of short fibers and becomes very brittle. By providing the chamfered portion 522d in the portion, the fibers constituting the portion become longer, so that the brittleness is remarkably reduced and chipping and peeling can be effectively suppressed. Even when the pen tip 502 is a pen tip made of a porous body having open cells, if the tip on the inner side of the front portion 523 of the pen tip 502 is at a right angle, that portion becomes very fragile. .. Even in this case, by providing the chamfered portion 522d in the portion, the brittleness of the portion is remarkably reduced, and chipping and peeling can be effectively suppressed.

On the other hand, the connecting portion 523b on the rear side of the front portion 523, which is continuous with the front portion 523 of the pen tip 502, extends substantially in the axial direction. However, the connection portion 523b is provided with a throttle portion 523c whose cross section changes with respect to the axial direction. The front end side of the squeezing portion 523c is continuous with the front portion 523 of the pen tip 502 (the cross section of the front portion 523 of the pen tip 502 with respect to the extending direction is substantially rectangular), and the rear end side of the squeezing portion 523c is It is continuous with the rear portion 523f of a substantially square columnar shape (the cross section in the axial direction is substantially rectangular). The change in the cross section of the drawn portion 523c with respect to the axial direction can be relatively easily processed into a desired shape by forming the notch 523d by grinding, punching, or the like.

In addition, as in the above-described embodiment, on the rear side of the connecting portion 523b of the pen tip 502 (rear side of the rear portion 523f), the outer surface is sandwiched in the front-rear direction by the holding member and the front shaft 4 (cylindrical shape). A central portion 524 (large diameter) and a cylindrical (small diameter) rear end portion 525 connected to the front end portion of the ink storage body 6 in a piercing manner are provided.

The pen tip 502 is not limited to a fiber pen tip (resin processed body of a fiber bundle) or a porous body of synthetic resin having open cells, and is a felt-tip pen tip, a brush pen tip, and a plastic having an axial capillary passage. It may be a pen tip, etc.

1 Writing tools 2, 2'Pen tip 22 Top 23 Front 23b, 23b' Connection 23c Squeezing 23d Notch 24 Central 25 Rear end 3, 3'Retaining member 31 Holding 33 Opening 34 Rear edge 35 Extension Outlet 35a Inner extension piece 35b Outer extension piece 36 First contact wall part 4 Front shaft 41 Second contact wall part 42 Third contact wall part 43 Vertical rib 5 Rear shaft 51 Second contact wall Part 6 Ink storage 101 Writing tool 102 Pen tip 122 Top 123 Front part 103 Holding member 131 Holding part 133 Opening 134 Rear end edge 135 Extension piece 202 Pen tip 222 Top 223 Front part

223b Connection part

223c Squeezing part 223d Notch

223e Transition part

223f Rear part 224 Central part 225 Rear end part 303 Holding part 331 Holding part 333 Opening part 334 Rear end edge part 335a Inward extending piece 335b Outer extending piece 335c Inclined surface 403 Holding member 431 Holding part 433 Opening part 434 Rear end edge 435a Inward extension piece 435b Outward extension piece 435c Inclined plane 502 Pen tip 522 Top 523 Front 523b Connection 523c Squeezing 523d Notch 523f Rear 524 Central 525 Rear end

Claims

With the pen tip
A holding member that holds the pen tip and
It is a stationery equipped with
The front portion of the pen tip extends in a straight line direction that is inclined at an acute angle in the side view with respect to the axial direction.
The cross section of the front portion of the pen tip with respect to the extension direction has a substantially rectangular shape.
The holding member has a holding portion that surrounds at least a part of the front portion of the pen tip.
The holding portion is provided with openings on both long sides of a substantially rectangular shape of the cross section of the front portion of the pen tip.
The top of the pen tip is formed in a substantially linear shape in a side view, and is substantially perpendicular to the extension direction of the front portion of the pen tip.
The trailing edge of the opening is formed in a substantially linear shape in a side view, and is substantially parallel to the top of the pen tip.
The holding portion is a substantially rectangular short side of the cross section of the front portion of the pen tip, and is on the short side inward in a side view, in the extending direction of the front portion of the pen tip. A writing instrument characterized by having an extension piece extending in a direction substantially parallel to the.
The holding portion is a pair of extending in a direction substantially parallel to the extending direction of the front portion of the pen tip on both short sides of a substantially rectangular shape of the cross section of the front portion of the pen tip. The writing tool according to claim 1, wherein the writing tool has an extension piece.
The writing tool according to claim 1 or 2, wherein the connecting portion on the rear side of the front portion continuous with the front portion of the pen tip extends substantially in the axial direction.
The writing tool according to claim 3, wherein the connection portion of the pen tip is provided with a diaphragm portion whose cross section changes with respect to the axial direction.
The writing tool according to any one of claims 1 to 4, wherein the width of the opening is larger than the width of the long side of the cross section of the front portion of the pen tip, which is substantially rectangular.
Further provided with a shaft tube connected to the holding member,
The rear portion of the holding member is attached to the front portion of the barrel.
A first contact wall portion is formed on the inner surface of the holding member.
A second contact wall portion is formed on the inner surface of the barrel.
The writing tool according to any one of claims 1 to 5, wherein the outer surface of the pen tip is sandwiched in the front-rear direction by the first contact wall portion and the second contact wall portion.
The claim is characterized in that the pen tip is either a fiber pen tip, a felt-tip pen tip, a pen tip made of a porous body having open cells, or a plastic pen tip having an axial capillary passage. The writing instrument according to any one of 1 to 6.
The writing tool according to any one of claims 1 to 7, wherein a chamfered portion is provided on the tip end portion of the front portion of the pen tip on a side inclined at an acute angle in a side view.