JPH088155Y2 - Writing instrument - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a writing instrument such as a water-based ballpoint pen or felt-tip pen provided with an ink occlusion body impregnated with a low-viscosity ink.

[Conventional technology]

In a water-based ballpoint pen, felt-tip pen, etc., it is common to provide a vent in a part of the shaft to adjust the internal pressure of the shaft and activate the induction of the ink stored in the ink occlusion body.
However, on the other hand, the vent hole unnecessarily evaporates the ink in the shaft, which is also a factor that shortens the writing life. Also,
If the writing instrument falls or is subject to knocking impact, or if the temperature rises suddenly, the ink will scatter or flow out from the end face of the ink occlusion body, and this ink will flow from the vent to the outside of the shaft. It also has the problem of leaking out and getting your hands dirty.

[Problems to be solved by the device]

The first object of the present invention is to suppress unnecessary evaporation of ink, and to prevent the ink from leaking from the vent even if the ink is scattered or flows out from the end face of the ink occlusion body for some reason. The second purpose is to do so.

[Means for solving the problem]

In order to achieve the above-mentioned object, the writing instrument according to the present invention has an ink occlusion body (3) housed in a shaft (2) having a pen tip (1) arranged at a front end thereof and a rear end of the shaft (2). A tail plug (4) is fitted, and the tail plug (4) is inserted between the ink occlusion body (3) and the shaft (2) so that the inner surface thereof is the outer surface of the ink occlusion body (3). A fitting cylinder part (5) whose outer surface contacts the inner surface of the shaft (2) in an airtight manner; a large-diameter inner hole part (6) opened to face the rear end surface of the ink occlusion body (3); An internal ventilation groove (8) formed in a part of the inner surface of the fitting cylinder part (5) so as to communicate the inner hole part (6) with the shaft inner space (7) in front of the tail plug (4); It is characterized in that a part of the outer surface of the fitting cylinder part (5) is provided with an external ventilation groove (9) formed so as to communicate the shaft internal space (7) and the outside of the shaft (2). Is something

In addition, in order to ensure the achievement of the above-mentioned second object, in particular, on the outer surface of the ink occlusion body (3) at a plurality of required positions in the circumferential direction on the inner surface of the shaft (2) in front of the tail plug (4). It is preferable that a rib (11) is provided so as to be in contact with the inner surface of the shaft (2) and the outer surface of the ink occlusion body (3) to secure a gap (10).

[Action]

The writing instrument of the present invention first comprises an inner hole (6) of the tail plug (4).
The inner ventilation groove (8), the outer ventilation groove (9), and the shaft inner space (7) form a ventilation path, and the ventilation path is long and complicatedly curved, so that diffusion of ink volatile components is suppressed. Unnecessary evaporation of ink is prevented. Next, the ink discharged from the rear end face of the ink occlusion body (3) for some reason enters the inner hole (6) of the tail plug (4), and the ink is moved down the pen tip (1) for writing. When it is directed to the inner vent groove (8), it is absorbed again by the ink occlusion body (3) so that it does not easily penetrate into the internal vent groove (8) provided in the tail plug (4), and even if the internal vent groove (8)
Even if the ink infiltrates into the shaft, the ink is diffused in the shaft inner space (7) ahead of it, so that there is almost no infiltration of the ink into the external ventilation groove (9), and therefore the leakage of the ink to the outside of the shaft is prevented. To be prevented. When a rib (11) for securing a gap (10) is provided between the inner surface of the shaft (2) and the outer surface of the ink occlusion body (3), the gap (10) allows Further, since the ink is diffused, the possibility of ink penetrating into the external ventilation groove (9) is further reduced.

〔Example〕

Embodiments will be described below with reference to the drawings. In Fig. 1, both ends are open, and a mouthpiece (13) is provided at the front end of a pipe-shaped shaft (2) having an enlarged inner diameter portion (12) at the rear end (the rear end is up and the front end is down in the drawing). ) Are joined together and the base (1
3) Ballpoint pen tip (14) with pen tip (1)
Is held, an ink guide core (15) is connected to the tip (14), and an ink occlusion body in which a fiber bundle (16) is covered with a resin coating (17) except for both end faces inside the shaft (1). (3) is housed, the rear end of the ink guide core (15) is inserted into the open front end face of the ink occlusion body (3), and the tail plug (4) is attached to the rear end of the shaft (2). Is fitted. The tail plug (4) has a fitting tube portion (5) in the first half thereof, and the fitting tube portion (5) has a shaft (2).
The inner surface of the enlarged inner diameter portion (12) is press-fitted into the inner diameter enlarged portion (12) at the rear end so that the outer surface thereof is in airtight contact with the inner surface of the inner diameter enlarged portion (12). Further, the rear end portion of the ink occlusion body (3) is fitted inside the fitting cylinder portion (5) so that the outer surface thereof is in airtight contact with the inner surface of the fitting cylinder portion (5). Therefore, the fitting tube portion (5) is in a state of being inserted between the ink occlusion body (3) and the shaft (2). The ink occlusion body (3) is located in the rear of the fitting cylinder portion (5) of the tail plug (4).
Is provided with an inner hole portion (6) having a large diameter that is opened so as to face the open rear end surface of the inner tube portion, and the front end of the inner hole portion (6) is fitted at one location on the inner surface of the fitting tube portion (5). A thin axial ventilation groove (8) that communicates with the axial internal space (7) in front of the tubular portion (5).
Is further provided, and the shaft inner space (7) and the shaft outer side are provided on the outer surface of the fitting cylinder part (5) at a position (see FIG. 2) rotated by approximately 180 ° in the circumferential direction from the inner ventilation groove (8). Is provided with an axially thin external ventilation groove (9).
The rear end of the external ventilation groove (9) extends rearward from the rear end edge of the shaft (2), and the rear end thereof serves as a ventilation port (18). Next, as shown in FIG. 3, on the inner surface of the shaft (2) in front of the enlarged inner diameter portion (12), the shaft is brought into contact with the outer surface of the ink occlusion body (3) at four desired positions in the circumferential direction. There is always a gap (1) between the inner surface of (2) and the outer surface of the ink occlusion body (3).
An axial rib (11) that secures 0) is integrally projected. The rib (11) may be provided as a separate component.

[Effect of device]

The present invention is as described above, and it is possible to prevent unnecessary evaporation of ink and prolong the life of writing, and to prevent ink from leaking from the vents and prevent stains on hands during writing. is there.

[Brief description of drawings]

1 is a vertical sectional view of the whole, FIG. 2 is an enlarged transverse sectional view taken along the line AA of FIG. 1, and FIG. 3 is an enlarged transverse sectional view taken along the line BB of FIG. (1) ... Nib, (2) ... Shaft, (3) ... Ink storage material, (4) ... Tail plug, (5) ... Fitting cylinder part, (6) ...
… Inner hole, (7) …… Shaft internal space, (8) …… Internal ventilation groove, (9) …… External ventilation groove, (10) …… Gap, (11)…
… Rib, (12) …… Inner diameter enlarged part, (13) …… Base, (1
4) …… Chip, (15) …… Ink induction core, (16) ……
Fiber bundles, (17) …… resin coating, (18) …… vent holes.

Claims (2)

[Scope of utility model registration request] 1. An ink occlusion body (3) is housed inside a shaft (2) having a pen tip (1) at its front end, and a tail plug (4) is fitted to the rear end of the shaft (2). , The tail plug (4) is inserted between the ink occlusion body (3) and the shaft (2) so that the inner surface is the outer surface of the ink occlusion body (3) and the outer surface is the inner surface of the shaft (2). A fitting cylinder part (5) that is in airtight contact with each other, a large-diameter inner hole part (6) opened to face the rear end surface of the ink occlusion body (3), and an inner surface of the fitting cylinder part (5). An inner ventilation groove (8) formed so as to communicate the inner hole portion (6) with the shaft inner space (7) in front of the tail plug (4), and the outer surface of the fitting tube portion (5). A writing instrument, characterized in that a part of the shaft is provided with an external ventilation groove (9) formed so as to connect the shaft internal space (7) with the outside of the shaft (2). 2. The inner surface of the shaft (2) is in contact with the outer surface of the ink occlusion body (3) at a plurality of predetermined circumferential positions on the inner surface of the shaft (2) in front of the tail plug (4). The writing instrument according to claim 1, wherein ribs (11) for securing a gap (10) are provided between the outer surfaces of (3).