JPS61179799A - Writing utensil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a writing instrument such as a ballpoint pen having a large capacity ink storage chamber.

[Technical background of the invention and its problems]

Conventionally, in a writing instrument such as a ballpoint pen, which has a large-capacity ink storage chamber with an open rear end and has a pen body attached to the writing end that communicates with the ink storage chamber so that ink can be drawn out, the ink head rear end of the ink storage chamber The concept of providing a slide plug in the ink storage chamber that blocks air from flowing into the ink storage chamber from the rear and that moves forward as the stored ink is consumed for writing is known to those skilled in the art; Writing instruments had the following problems and could not be put into practical use (commercialization).

■ When a slide plug as described above is installed at the rear end of the ink head in the ink storage chamber, the weight of the slide plug and the weight of the ink are equal to the water head (ink Since the ink extrusion force acts on the pen body portion as an ink extrusion force corresponding to the height of the head), a problem occurs in which ink excessively flows out from the tip of the pen body (ink dripping phenomenon).

■ In addition, when the writing instrument is not in use with the pen tip facing upward, the slide plug moves downward (to the rear of the barrel) due to its own weight, and outside air enters the ink storage chamber from the pen body side.
Since there is no ink inside the pen body, not only will you not be able to write immediately even if you try to write with the pen body facing down, but you will also have the problem that ink will spray out of the pen body due to the temperature expansion of the air that has entered the ink chamber. Occur.

[Means for solving problems]

This invention has been made for the purpose of solving the above-mentioned problems.The present invention has been made in order to solve the above-mentioned problems. The slide stopper is formed of a flexible elastic material that is elastically recessed and engaged with the slide stopper stop on the inside of the ink chamber, and the elastic material does not slide when the writing instrument is at rest. It has a recessed force that prevents the stopper from falling under its own weight in the front-back direction, and when the writing instrument is used, the recessed engagement part with respect to the slide stopper locking part becomes elastic due to the wave transmission of the minute movement generated by the writing action. It is characterized by having sliding properties that allow it to slide down while deforming and moving.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show a large-capacity ink storage chamber 1 whose rear end is open and an ink chamber 2 that accommodates, for example, about 3 cc of water-based ink P. The pen body 3 formed as a ballpoint pen tip is attached to the communicating writing end), and the pen body 3 formed as a ballpoint pen tip is attached to the rear end portion of the ink storage chamber 1 following the ink head pa to block air inflow from the rear into the ink storage chamber 1 and to accommodate the pen body 3. This shows an example of application as a ballpoint pen in which a slide stopper 4 that moves forward as ink P is consumed for writing is provided, and a cap 5 having a ventilation hole 5a is fitted and fixed to the rear end opening of the barrel 2. , a plurality of micro protrusions 6, for example 6 micro protrusions 6, or radial slide plug locking portions, protruding from the slide plug movement area of the inner wall of the ink storage chamber 1 at intervals p1 to pn slightly shorter than the length 2 of the slide plug 4. The slide stopper 4 is formed of a flexible elastic material so that the slide stopper 4 is elastically recessed and engaged with this slide stopper locking portion. The elastic material forming the slide stopper 4 has a recessed impact force that prevents the slide stopper 4 from falling under its own weight in the front-rear direction of the barrel 2 when the writing instrument (ballpoint pen) is in an upward or downward stationary state. When used for writing, the slide stopper recessed engagement portion 4a is elastically deformed and slid against the minute protrusion 6 due to wave transmission of minute vibrations generated by the writing action, and has sliding properties.
In the case of this embodiment, an agar solution (an agar solution prepared by adding agar to water at a ratio of 15=1/weight and heating it to dissolve the agar into a slurry) is applied to the ink head of the ink storage chamber 1. In the rear end part following pa
``It is made of agar that has been poured (injected and filled) in a predetermined amount and then cooled and solidified.

The locking force of the micro protrusions 6 on the slide stopper 4 when the writing instrument is stationary needs to be strong enough to support the weight of the ink and the weight of the slide stopper 4 (necessary when the writing instrument is stationary with the pen body 3 facing upward). However, since the ink weight related to the locking force of the slide plug 4 gradually decreases as ink is consumed, the slide plug locking force by the minute protrusions 6 gradually weakens as the position of the ink head pa changes. This is effective in enabling smooth forward movement of the slide stopper 4 as ink is consumed during writing, so in the case of this embodiment, the minute protrusions 6
The height of the inner surface protrusion is changed such that it decreases sequentially from the microprotrusions at the rear position to the microprotrusions at the front position. For example, the protrusion height of the microprotrusion 6 at the rear end is set to 0.2.
tttxt, and then the front ones are successively lowered so that the protrusion height of the frontmost microprotrusion 6 is 0.1M.

In the ballpoint pen having the above structure, when the ballpoint pen is in a resting state when not in use, the slide stopper 4 made of agar engages the minute protrusions 6 in a recessed manner, and the rear end portion continues to the ink head pa in the ink storage chamber 1. Since it is locked so that it does not move, for example, even when the pen body 3 is held downward, the weight of the slide stopper 4 does not act on the pen body 3 side through the stored ink P. Even if the stored ink P tries to fall due to the weight, the air inflow from the rear of the shaft 1!12 into the ink storage v1 is completely blocked by the slide plug 4, so that the stored ink P cannot fall.
In order for the pen to be lowered by the weight, it is necessary for air to enter the ink storage chamber 1 from the rear of the barrel cylinder 2). Therefore, the phenomenon of ink leakage does not occur in the stationary state where the pen body is held facing downward.

In addition, even in the stationary state where the pen body is held upward, the slide plug 4 is recessed and engaged with the minute protrusion 6 with a locking force that can support the weight of ink and the slide plug's own weight, so that the ink storage chamber 1 from the pen body 3 side The problem of outside air infiltration does not occur. Of course, even when the ballpoint pen is placed horizontally at rest, there is no air at all in the ink storage chamber 1, so the problem of ink spewing out due to temperature expansion of the air does not occur.

On the other hand, the slide stopper 4 prevents odor during writing.

As the recessed engagement portion 4a for the minute protrusion 6 is elastically deformed and moved by the wave transmission of minute vibrations generated during the writing operation, it slides down to follow the ink head pa, causing problems such as running out of ink during writing. Good ink extraction is possible without any problems.

In the above embodiments (the embodiments shown in FIGS. 1 and 2), the slide plug 4 is made of agar, and the slide plug locking portion on the inner wall of the ink storage chamber 1 is made of minute protrusions 6. However, the slide plug locking portion on the inner wall of the ink storage chamber 1 may be a spiral micro-protrusion, a large number of micro-projections protruding from the entire surface of the ink chamber wall, or the slide plug 4 may be attached to the above-mentioned can. It can also be made of a gel-like substance, konnyaku, or pudding, which has a recessed impact force and sliding properties similar to that of It is also possible to form it from soft synthetic resin. Furthermore, the writing instruments to which the present invention is applied are not limited to ballpoint pens, but can be applied to various writing instruments equipped with textile pen bodies or the like.

Figures 3 and 4 show an example of application to a writing instrument consisting of a barrel (not shown) and a core 12 fitted into the barrel, with a large capacity ink storage chamber. 1 (an ink chamber that can accommodate about 1.5cc of low-activity ink P, etc., and has a larger capacity compared to the conventional normal ink storage capacity of 0.5cc) is a 6 to 7 inch inner diameter The ballpoint pen body 3 is attached to the writing end of the core 12 that communicates with the ink storage chamber 1, and the minute protrusion 6' on the inner wall of the ink storage chamber 1 touches the outer wall of the core. The fact that it is formed by punching from the outside in is shown in Figures 1 and 42.
This is different from the embodiment shown in the figure. Since the other configurations are the same, specific explanation of the slide stopper 4 and the like will be omitted.

〔Effect of the invention〕

Since the writing instrument of the present invention has the above-mentioned structure, it can easily solve problems such as excessive leakage of large-capacity ink, which had previously been impossible to put into practical use (commercialization), and can accommodate large-capacity ink. This has the effect of making it possible to put the shaped writing instrument into practical use.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a writing instrument according to an embodiment of the present invention;
2 is a partial cross-sectional view taken along the line ■-■ in FIG. ! FIG. 1...Large capacity ink storage, P...Accommodated ink,
pa: ink head, 2: barrel, 3: pen body, 4: slide plug, 4a: recessed engagement part of slide plug, 2: length of slide plug , 6.6'...Minute protrusion, 12... Central core.

Claims (4)

[Claims] (1) It has a large-capacity ink storage chamber with an open rear end, the pen body is attached to the writing end that communicates with this ink storage chamber so that ink can be drawn out, and ink is stored in the rear end of the ink head of the ink storage chamber. In a writing instrument equipped with a slide stopper that blocks air inflow into the chamber from the rear and moves forward as the ink in the chamber is consumed for writing, an appropriate number of minute protrusions or spirals are formed on the slide stopper movement area of the wall of the ink storage chamber. A slide plug locking portion such as a micro-protrusion or a large number of minute protrusions is provided, and the slide plug is made of a flexible elastic material that is elastically recessed and engaged with the slide plug locking portion on the inner surface of the ink chamber. This elastic material has a recessed force that prevents the slide stopper from falling back and forth under its own weight when the writing instrument is at rest, and when the writing instrument is in use, it slides due to the wave transmission of minute vibrations generated by the writing action. A writing instrument characterized in that the recessed engagement portion with respect to the stopper locking portion has sliding properties such that it slides down while elastically deforming and moving. (2) Agar in which the slide plug injects and fills an agar solution into the rear end portion of the ink head of the ink storage chamber and cools and solidifies it, or a gel-like substance similar to this agar;
The writing instrument according to claim 1, characterized in that it is made of konjac or pudding. (3) The slide stopper is made of flexible elastic rubber having a shore hardness of about 30 degrees or a flexible soft synthetic resin having elasticity about the hardness of this rubber. writing utensils. (4) The slide plug locking part in the ink storage chamber is a plurality of micro protrusions protruding at intervals slightly shorter than the length of the slide cap, and the inner protrusion height of these micro protrusions varies from the micro protrusions at the rear position to the front position. The writing instrument according to claim 1, characterized in that the height of the writing instrument gradually decreases as the microprotrusions get closer to each other.