JP2021167115A - Writing utensil - Google Patents

Abstract

To provide a writing utensil which is configured so that a pen point is unlikely to be immersed into a barrel during writing and yet a state where the barrel is fitted to a cartridge is not changed by writing or attachment/detachment of a cap so as to allow the cartridge to be easily detached, and further, the cartridge is unlikely to be pulled out by mistake when the cap is detached and the number of components of the cartridge can be reduced.SOLUTION: A pen point holder 5 comprises a tapered front portion 51, an insertion portion 52, a press-in portion 53 and a step portion 54. The tapered front portion 51 is positioned closer to a front than a front end of a barrel 2. The step portion 54 is contacted with the front end of the barrel 2. An outer surface of the insertion portion 52 is detachably fitted to an inner surface of an opening portion at the front end of the barrel 2. On the outer surface of the tapered front portion 51 is formed a holding portion 51a for attachment and detachment of the cartridge. A cap 7 is in non-contact with the tapered front portion 51.SELECTED DRAWING: Figure 2

Description

The present invention relates to a writing instrument.

Conventionally, in this type of writing tool, for example, in Patent Document 1, an attachment body made of rubber, synthetic resin, or the like is fitted to the opening of a barrel, and rubber is provided near the writing portion of an internal mechanism such as a cartridge type ballpoint pen. , A structure is disclosed in which a fitting body made of synthetic resin or the like is attached, and the inclined surface of the fitting body is closely fitted to the opening of the attachment body.

Japanese Unexamined Patent Publication No. 61-112700

The writing instrument of Patent Document 1 has a structure in which a fitting body of another part is fitted in the vicinity of the writing portion of an internal mechanism (corresponding to the cartridge of the present application) such as a ballpoint pen. Therefore, there is a risk that the fitting body and the internal mechanism such as a ballpoint pen will be disengaged due to the writing pressure during writing, and the pen tip will be immersed in the barrel. Further, the manufacturing cost of the writing tool of Patent Document 1 increases as the number of parts of the internal mechanism such as a ballpoint pen increases due to the fitting body.

Further, in the writing instrument of Patent Document 1, the inclined surface of the fitting body may bite into the opening of the mounting body of the barrel due to the writing pressure at the time of writing, and it may be difficult to remove the internal mechanism such as the ballpoint pen. Further, since the writing tool of Patent Document 1 has a structure in which the cap also fits into the fitting body, the fitting body may further bite into the mounting body due to a strong pushing operation of the cap when the cap is attached. When removing the cap, there is a risk of accidentally pulling out the internal mechanism such as a ballpoint pen.

The present invention solves the above-mentioned conventional problems, and there is no possibility that the pen tip is immersed in the barrel during writing, and the fitting state of the barrel and the cartridge can be changed by writing or attaching / detaching the cap. However, it is an attempt to provide a writing instrument that is always easy to remove the cartridge, does not have a risk of accidentally pulling out the cartridge when removing the cap, and can suppress an increase in the number of parts of the cartridge.

In the present invention, "front" refers to the pen tip side, and "rear" refers to the cartridge side on the opposite side.

The first invention of the present application comprises a shaft cylinder 2, a cartridge 3 provided with a pen tip 4 at the front end and detachable at the front end opening of the shaft cylinder 2, and a cap 7 attached to the pen tip side. The writing tool provided includes a pen tip 4, a pen tip holder 5 to which the pen tip 4 is fixed, and an ink storage cylinder 6 to which the rear portion of the pen tip holder 5 is press-fitted and fixed. The pen tip holder 5 has a tapered front portion 51 to which the pen tip 4 is fixed, and an insertion portion formed behind the tapered front portion 51 and having an outer diameter smaller than the rear end of the tapered front portion 51. 52, a press-fit portion 53 formed behind the insertion portion 52, having an outer diameter smaller than that of the insertion portion 52, and press-fitting and fixing to the front end opening of the ink storage cylinder 6, and the tapered front portion. A stepped portion 54 formed between the 51 and the insertion portion 52 is provided, and in a state where the cartridge 3 is inserted into the front end opening of the barrel 2, the tapered front portion 51 is the barrel. Located in front of the front end of 2, the step portion 54 is in contact with the front end of the barrel 2, the outer surface of the insertion portion 52 is detachably fitted to the inner surface of the front end opening of the barrel 2, and the taper is tapered. A grip portion 51a for attaching / detaching a cartridge is formed on the outer surface of the front portion 51, and the cap 7 is fitted to the outer surface of the front end portion of the barrel 2 in a state where the cap 7 is attached to the pen tip side. The cap 7 is in a non-contact state with the tapered front portion 51.

Since the writing instrument 1 of the first invention adopts the above-described embodiment, the stepped portion 54 of the pen tip holder 5 is in contact with the front end of the shaft cylinder 2, so that the pen tip 4 is placed in the shaft cylinder 2 during writing. Since it is possible to avoid immersion and the cap 7 is in a non-contact state with the tapered front portion 51, the mating state of the barrel 2 and the cartridge 3 does not change when the cap is attached or detached, and the cartridge 3 can always be easily removed. In addition, there is no risk of accidentally pulling out the cartridge 3 when the cap 7 is removed, and the increase in the number of parts of the cartridge 3 is suppressed, which is obtained by a simple structure.

The second invention of the present application is characterized in that, in the writing tool 1 of the first invention, a non-slip portion is formed on the grip portion 51a.

In the writing tool 1 of the second invention, since the non-slip portion is formed on the grip portion 51a, the cartridge 3 can be easily attached and detached, and the writing tool 1 can be easily gripped at the time of writing. Specific examples of the non-slip portion include an uneven portion formed on the surface of the grip portion 51a, an outer skin made of an elastic material, and the like. Examples of the uneven portion include a plurality of annular convex portions or concave portions, a mesh-like convex portion or concave portion, a plurality of point-shaped convex portions or concave portions, and the like.

There is no risk of the pen tip immersing in the barrel during writing, and the mating state of the barrel and cartridge does not change when writing or attaching / detaching the cap, making it always easy to remove the cartridge, and further removing the cap. There is no risk of accidentally pulling out the cartridge at times, and moreover, it is possible to suppress an increase in the number of parts of the cartridge.

It is a vertical sectional view of the Embodiment of this invention. It is an enlarged vertical sectional view of the main part of FIG. It is a front view which shows the cartridge of FIG. It is an enlarged front view which shows the pen tip holder of FIG.

Embodiments of the writing instrument of the present invention will be described with reference to the drawings. (See FIGS. 1 to 4)

The writing instrument 1 of the present embodiment includes a shaft cylinder 2, a cartridge 3 provided with a pen tip 4 at the front end and detachable at the front end opening of the shaft cylinder 2, and a cap 7 attached to the pen tip side. To be equipped.

-Shaft cylinder The shaft cylinder 2 is a cylindrical body made of synthetic resin or metal with both ends open.

Inner fitting portion The inner fitting portion 21 is formed on the inner surface of the front end opening of the barrel 2. The inner fitting portion 21 is formed of an annular smooth surface. The outer fitting portion 52a of the small diameter portion of the pen tip holder 5 is detachably fitted to the inner fitting portion 21. The inner fitting portion 21 may be an inward projection (for example, an annular projection, a plurality of point-like projections dispersed in a circumferential shape, or the like) in addition to the annular smooth surface.

-Cap fitting portion A cap fitting portion 22 is formed on the outer surface of the front end portion of the barrel 2 so that the inner surface of the cap 7 can be attached and detached. The cap fitting portion 22 is formed by an outward protrusion. The outward protrusions are composed of, for example, an annular protrusion or a plurality of point-like protrusions distributed in a circumferential manner. The cap fitting portion 22 may have an annular smooth surface as well as an outward protrusion.

-Friction member A friction member 8 made of a low-wear elastic material (for example, silicone resin, SBS resin, SEBS resin, etc.) is press-fitted and fixed to the rear end opening of the barrel 2. The friction member 8 thermally discolors the handwriting by the frictional heat generated by rubbing the handwriting of the heat-discoloring ink.

-Cartridge The cartridge 3 includes a pen tip 4, a pen tip holder 5 to which the pen tip 4 is fixed to the front portion, and an ink storage cylinder 6 to which the rear portion of the pen tip holder 5 is fixed to the front end.

-Pen tip As the pen tip 4, a ballpoint pen tip in which a ball is rotatably held at the front end is adopted.
In the ballpoint pen tip, an elastic body that urges the ball forward and brings the ball into close contact with the inner surface of the front end edge portion is housed. By bringing the ball into close contact with the inner surface of the front end edge portion, ink leakage and air mixing from the pen tip 4 during non-writing can be prevented. In addition to the ballpoint pen tip, the pen tip 4 may be a marking pen body made of a fiber processed body or a porous body.

-Pen tip holder The pen tip holder 5 is made of a cylindrical body made of synthetic resin with both ends opened. The pen tip 4 is fixed to the front end opening of the pen tip holder 5. The rear end of the pen tip holder 5 is press-fitted and fixed to the front end opening of the ink storage cylinder 6.

The outer surface of the pen tip holder 5 is an insertion portion 52 formed behind the tapered front portion 51 at the front end portion and the tapered front portion 51 and having an outer diameter smaller than the outer diameter of the rear end of the tapered front portion 51. Between the press-fitting portion 53, which is formed behind the insertion portion 52 and has an outer diameter smaller than the outer diameter of the rear end of the insertion portion 52, and the tapered front portion 51 and the insertion portion 52. A first step portion 54 to be formed and a second step portion 55 formed between the insertion portion 52 and the press-fitting portion 53 are provided.

1
In a state where the outer surface (outer fitting portion 52a) of the insertion portion 52 is fitted to the inner surface (inner fitting portion 21) of the front end opening of the barrel 2, the tapered front portion 51 is from the front end portion of the barrel 2. Located forward. A grip portion 51a is formed on the outer surface of the tapered front portion 51 when the cartridge is attached / detached (when the cartridge is replaced). The outer diameter of the rear end portion of the tapered front portion 51 is set to substantially the same outer diameter as the outer diameter of the front end portion of the barrel 2. As a result, at the time of writing, the region of the front end portion outer surface of the barrel 2 behind the large diameter portion outer surface can be gripped. The tapered front end portion 51 is formed in a tapered shape at the front end portion.

A non-slip portion composed of an uneven portion (an uneven portion formed by a plurality of annular protrusions and a plurality of annular grooves) is formed on the surface of the grip portion 51a. As a result, stable gripping is possible when the cartridge is attached / detached and when writing.

Further, the outer diameter of the rear end portion of the tapered front portion 51 is set to an outer diameter smaller than the inner diameter of the opening portion of the cap 7 of the barrel 2. As a result, the non-contact state between the inner surface of the cap 7 and the pen tip holder 5 is maintained.

An outer fitting portion 52a that is detachably fitted to the inner fitting portion 21 on the inner surface of the front end opening of the barrel 2 is formed on the outer surface of the insertion portion 52. The outer fitting portion 52a is formed by an annular outward protrusion. The outer fitting portion 52a is fitted with the inner fitting portion 21 (annular smooth surface) on the inner surface of the front end opening of the barrel 2. In a state where the outer fitting portion 52a is fitted with the inner fitting portion 21 on the inner surface of the front end opening of the shaft cylinder 2, the first step portion 54 and the front end of the shaft cylinder 2 are brought into contact with each other in the front-rear direction, and the pen The backward movement of the tip holder 5 is restricted. In addition to this, the outer fitting portion 52a may have an annular smooth surface.

The outer surface of the press-fitting portion 53 is formed by an annular smooth surface. The outer surface of the press-fitting portion 53 is press-fitted and fixed to the inner surface of the front end opening of the ink containing cylinder 6. In a state where the outer surface of the press-fitting portion 53 is press-fitted and fixed to the inner surface of the front end opening of the ink containing cylinder 6, the second step portion 55 and the front end of the ink containing cylinder 6 are brought into contact with each other in the front-rear direction.

-Ink storage cylinder The ink storage cylinder 6 is a cylindrical body having both ends opened, and is obtained by extrusion molding of a synthetic resin. The outer diameter of the ink accommodating cylinder 6 is set smaller than the outer diameter of the outer fitting portion 52a of the insertion portion 52. As a result, the ink accommodating cylinder 6 can be smoothly inserted into the front end opening of the shaft cylinder 2. Inside the ink accommodating cylinder 6, an ink (water-based or oil-based ink) and a follower (for example, a high-viscosity fluid) filled at the rear end of the ink and advancing with the consumption of the ink are accommodated. In the present embodiment, preferably, a water-based thermochromic ink is adopted as the ink. The heat-discoloring ink is preferably a reversible heat-discoloring ink that discolors or decolorizes by heating. A tail plug may be fixed to the rear end of the ink containing cylinder 6.

-Cap The cap 7 is formed of a bottomed cylindrical body having one end open and the other end closed, and is obtained from a synthetic resin molded body. On the inner surface of the opening of the cap 7, a fitted portion 71 that can be fitted to the cap fitting portion 22 of the barrel 2 is formed. The fitted portion 71 is formed by an inward projection. The inward protrusions (for example, annular protrusions, a plurality of point-like protrusions dispersedly arranged in a circumferential shape, etc.) are overcome and locked with the cap fitting portion 22 (outward protrusions). The fitted portion 71 may be an annular smooth surface in addition to the inward projection.

Air passage A first air groove 56 in the radial direction is formed in the first step portion 54, and a second air groove 56 in the front-rear direction communicating with the first air groove 56 is formed on the outer surface of the insertion portion 52. An air groove 57 is formed, and an air flow gap 9 communicating with the second air groove 57 is formed between the outer surface of the ink accommodating cylinder 6 and the inner surface of the shaft cylinder 2. In a state where the cap 7 is removed from the pen tip side and the cartridge 3 is inserted into the barrel 2, the ink is contained by the first air groove 56, the second air groove 57, and the air flow gap 9. Air can flow between the rear end opening of the cylinder 6 and the outside air.

-Cartridge removal With the cartridge 3 inserted in the barrel 2, the cap 7 is removed from the pen tip side, the outer surface of the barrel 2 is gripped with one hand, and the grip portion 51a of the pen tip holder 5 is gripped with the other hand. The cartridge 3 can be removed from the barrel 2 by grasping and pulling the cartridge 3.

-Inserting the cartridge With the cartridge 3 removed from the shaft cylinder 2, when the grip portion 51a of the pen tip holder 5 is grasped by hand and inserted into the front end opening of the shaft cylinder 2 from the rear end of the ink storage cylinder 6, the pen is inserted. The first step portion 54 of the tip holder 5 is brought into contact with the front end of the barrel 2, and the insertion portion 52 of the pen tip holder 5 is inserted into the inner surface of the front end opening of the barrel 2. As a result, the cartridge 3 is in a state of being inserted into the barrel 2.

In the writing instrument 1 of the present embodiment, since the first step portion 54 of the pen tip holder 5 is in contact with the front end of the shaft cylinder 2, it is possible to prevent the pen tip 4 from being immersed in the shaft cylinder 2 during writing. .. Further, since the cap 7 is in a non-contact state with the tapered front portion 51, the mating state of the barrel 2 and the cartridge 3 does not change when the cap is attached or detached, and the cartridge 3 can always be easily removed and the cap. There is no risk of accidentally pulling out the cartridge 3 when removing 7. Moreover, it can be obtained by a simple structure while suppressing an increase in the number of parts of the cartridge 3.

In the writing tool 1 of the present embodiment, since the non-slip portion is formed on the grip portion 51a, the cartridge 3 can be easily attached and detached, and the writing tool 1 can be easily gripped at the time of writing.

1 Writing implement 2 Shaft cylinder 21 Inner fitting part 22 Cap fitting part 3 Cartridge 4 Pen tip 5 Pen tip holder 51 Tapered front part 51a Gripping part 52 Inserting part 52a Outer fitting part 53 Press-fitting part 54 First step part 55 Second step portion 56 First air groove 57 Second air groove 6 Ink storage cylinder 7 Cap 71 Fitted portion 8 Friction member 9 Air flow gap

In the state in which the outer surface of the front Symbol insertion portion 52 (the outer fitting portion 52a) is fitted into the front end opening inner surface of the barrel 2 (the inner fitting portion 21), the tapered front portion 51 the barrel 2 forward end It is located further forward. A grip portion 51a is formed on the outer surface of the tapered front portion 51 when the cartridge is attached / detached (when the cartridge is replaced). The outer diameter of the rear end portion of the tapered front portion 51 is set to substantially the same outer diameter as the outer diameter of the front end portion of the barrel 2. As a result, at the time of writing, the region of the front end portion outer surface of the barrel 2 behind the large diameter portion outer surface can be gripped. The tapered front end portion 51 is formed in a tapered shape at the front end portion.

Claims (2)

A writing instrument having a shaft cylinder, a cartridge having a pen tip at the front end and a detachable cartridge at the front end opening of the shaft cylinder, and a cap attached to the pen tip side.
The cartridge includes a pen tip, a pen tip holder to which the pen tip is fixed, and an ink storage cylinder to which the rear portion of the pen tip holder is press-fitted and fixed.
The pen tip holder has a tapered front portion to which the pen tip is fixed, an insertion portion formed behind the tapered front portion and having an outer diameter smaller than the rear end of the tapered front portion, and the insertion portion. A press-fitting portion that is formed further rearward, has an outer diameter smaller than that of the insertion portion, and is press-fitted and fixed to the front end opening of the ink storage cylinder, and is formed between the tapered front portion and the insertion portion. Equipped with a step part
In a state where the cartridge is inserted into the front end opening of the barrel, the tapered front portion is located in front of the front end of the barrel, the step portion is brought into contact with the front end of the barrel, and the insertion is performed. The outer surface of the portion is detachably fitted to the inner surface of the front end opening of the barrel, and a grip portion for attaching / detaching the cartridge is formed on the outer surface of the tapered front portion.
A writing instrument characterized in that, in a state where the cap is attached to the pen tip side, the cap is fitted to the outer surface of the front end portion of the barrel, and the cap is in a non-contact state with the tapered front portion. The writing tool according to claim 1, wherein a non-slip portion is formed on the grip portion.

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