JPH0839985A - Core holding structure of writing utencil - Google Patents

Abstract

PURPOSE:To provide a core holding structure of writing utensil which is applied to the writing utensil wherein a core filled with ink is charged within a cylindrical holder and the ink does not streamed out from a pen point even if the writing utensil is dropped errorneously. CONSTITUTION:Annular buffer material 60 is arranged at a pen point side of a core 30 charged into a cylindrical holder 10. The buffer material 60 may be either a closed cell or an interconnecting cell. On the occasion when writing utensil is dropped, a shock of dropping is absorbed by the buffer material 60 and ink is prevented from being leaked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for holding a core of a writing tool in which a core filled with ink is loaded in a cylindrical holder, and more specifically, the writing tool is dropped with the pen tip facing down. The present invention relates to a core holding structure for a writing instrument that prevents ink from flowing out of a pen tip.

[0002]

2. Description of the Related Art As shown in FIG. 2, a writing instrument such as a felt-tip pen has a narrowed tip portion 1 of a cylindrical holder 10.
A pen tip 20 is attached to the nozzle 1, and a center core 30 filled with ink is inserted in the middle portion of the holder 10. Figure 2
In the above configuration, the rib 40 as shown in FIG. 3A is provided inside the tip portion 11 of the holder 10, and
Is held by the rib 40 and the tail plug 50 fitted in the rear end of the holder 10.

Further, the cylindrical portion of the holder 10 is also shown in FIG.
The rib 41 is provided as shown in (b), and the gap between the ribs 41 forms the air hole 1 between the core 30 and the inner surface of the holder 10. Further, the core 30 and the nib 20 are connected by an ink guide core 23, and the ink filled in the core 30 passes through the ink guide core 23 and passes through the pen tip 2.
It exudes from 0. A space 2 is created between the ink guide core 23 and the tip plug 40.

[0004]

The ink filled in the core 30 passes through the ink guide core 23 and passes through the nib 20.
Exudates from. Therefore, the base end portion of the ink guide core 23 is embedded in the middle core 30 in an appropriate amount so that the ink is exuded from the nib 20, and the ink guide core 23 sucks the ink in the middle core 30. There is.

However, the writing instrument of the prior art is mistakenly used for the pen tip 2
When dropped with the 0 side down, the ink was scattered from the pen tip 20. That is, due to the impact when the writing instrument falls, the ink filled in the core 30 is ejected to the pen tip 20 side, and the ink is ejected from the pen tip 2.
There was a case where it leaked directly to the outside from the gap between 0 and the holder 10. Even if the ink does not leak directly to the outside, the ejected ink is stored in the space 2 around the ink guide core 23, and the ink is excessively sucked into the ink guide core 23. As a result, a large amount of ink flows out from the pen tip 20 during writing, causing a problem such as character bleeding. There is also a problem that the fiber portion of the core 30 is displaced due to the impact when dropped.

Further, the core 30 is manufactured by appropriately cutting a fiber bundle or the like. However, variations in the binding force of the fiber bundle,
Due to the difficulty of holding during cutting, the length of the manufactured core varies widely. On the other hand, in the writing instrument of the prior art, since the center core 30 was held between the tail plug 50 and the rib 40, there was no flexibility in the holding space. Therefore, for example, when the core 30 is longer than the standard, there is a problem that the core 30 receives a compressive force and the ink inside leaks. On the other hand, when the core 30 is shorter than the standard product, the core 30 moves and receives the rib 40 when the impact such as the drop as described above is received.
There was a problem that a large amount of ink was ejected because it collided with.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a writing tool holding structure in which there is no problem such as a large amount of ink flowing out from the pen tip even when the writing tool drops with the pen tip side down. .

[0008]

[Means for Solving the Problems] A first means for achieving the above object is a structure for holding a core of a writing instrument in which a core filled with ink is loaded into a cylindrical holder equipped with a pen tip. In the above, there is provided a core holding structure for a writing instrument, wherein a ring-shaped cushioning material is arranged on a pen tip side of the core inserted in the holder.

A second means for achieving the above object is:
A core holding structure for a writing instrument, characterized in that the cushioning material according to the first means is formed of a foam.

A third means for achieving the above object is as follows:
A core holding structure for a writing instrument, characterized in that the buffer material according to the first or second means is formed of a material having a liquid absorbing capacity and having a capillary force weaker than that of the core.

[0011] A fourth means for achieving the above object is as follows.
A core holding structure for a writing instrument, characterized in that the cushioning material according to the first or second means is formed of a material which is an open cell and is softer than the core and contracts in the length direction.

A fourth means for achieving the above object is to:
A core holding structure for a writing instrument, characterized in that the cushioning material according to the first or second means is formed of a material which is an open cell and is softer than the core and contracts in a radial direction.

[0013]

According to the above-mentioned first or second means, even if the writing instrument falls, the shock absorbing material acts as a cushion to absorb the shock received by the core. Therefore, according to this means, the ink is less likely to be ejected from the core.

According to the third means, since the cushioning material has a liquid absorbing capacity, the ink ejected from the core into the holder on the pen tip side is once absorbed by the cushioning material or the like. Further, in the present invention, since the capillary force of the cushioning material is weaker than that of the core, the ink absorbed by the cushioning material returns to the core with the passage of time.

According to the fourth means, when the writing instrument falls, the cushioning material contracts in the length direction. The ink ejected from the core into the holder on the pen tip side is absorbed by the buffer material when the contracted buffer material returns to the original state.

According to the fifth means, when the writing instrument falls, the inner diameter of the cushioning material contracts in the radial direction. That is, the cushioning material spreads in the space in front of the core. Therefore, the ink ejected from the core into the holder on the pen tip side is immediately absorbed by the cushioning material.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment according to the present invention will be described with reference to FIG. FIG. 1 is a sectional view showing an embodiment according to the present invention. It should be noted that the same parts as those of the related art are denoted by the same reference numerals and the description thereof will be omitted.

The core holding structure for a writing instrument according to the present invention has a pen tip 20 of a core 30 loaded in a cylindrical holder 10.
A ring-shaped cushioning material 60 is arranged on the side. More specifically, the cushioning material 60 is arranged between the core 30 and the rib 40 as shown in FIG. 1, and the cushioning material 60 is regulated by the tail plug 50 at the position of the core 30. Therefore, even if an impact such as dropping is applied to the writing instrument of this embodiment, the impact is absorbed by the cushioning material. Therefore, the impact applied to the core 30 is reduced, and the amount of ink ejected from the core 30 is small.

Although the material of the cushioning material 60 is arbitrary, the cushioning material 60 is merely provided with an impact absorbing function depending on the physicochemical properties of the ink, the amount of ink to be filled, and the dimensional variation of the core 30. And when
It may be preferable to have an ink absorbing function in addition to the shock absorbing function. The case 3 will be explained separately.
If you want to avoid ink jet from 0 as much as possible, cushioning material 60
It is desirable to employ a closed cell foam.

On the other hand, when it is preferable that the cushioning material 60 has an ink absorbing function in addition to the shock absorbing function, it is desirable that the cushioning material 60 be a foam having a liquid absorbing capacity. More specifically, the cushioning material 60 is preferably a porous material having open cells and capable of absorbing ink by capillary force or the like. However, even with a cushioning material that expects such an action, three modes are possible depending on the application.

The cushioning material 60 of the first embodiment is made of a material having a liquid absorbing capacity and having a capillary force weaker than that of the core 30. In the cushioning material 60 used in this embodiment,
Since the capillary force of the cushioning material 60 is weaker than that of the core 30, the ink filled in the core 30 is not used in normal use.
Will not be absorbed by. Therefore, the ink in the core 30 can be used without waste. On the other hand, pen tip 2
Assuming a case where the writing instrument falls with the 0 side down, the cushioning material 60 serves as a cushion, so the ink does not spout much from the core 30, but the slightly spewed ink is collected in the space 2, and The ink is absorbed by the buffer material 60 by the capillary force. The ink absorbed by the cushioning material 60 is gradually absorbed by the core 30 over time, and the ink ejected from the core 30 is absorbed by the ink guide core 2.
3 does not leak to the pen tip 20 in a large amount.

The cushioning material 60 of the second embodiment is, for example, the core 3
It is made of a material that is softer than 0 and easily contracts in the length direction. Further, the porosity of the cushioning material 60 is made larger than that of the core 30, so that the ink filled in the core 30 is not absorbed by the cushioning material 60. When the writing instrument falls with the pen tip 20 side down, some ink is ejected from the core 30. At this time, the cushioning material 60 is compressed by the impact and contracts in the length direction. When the cushioning material 60 returns to its original state,
The cushioning material 60 absorbs the ink ejected from the core 30 into the space 2. When expecting the above-mentioned action in the cushioning material 60, a material having a large expansion ratio is more convenient because it can absorb a large amount of ink. The ink absorbed by the cushioning material 60 is preferably gradually absorbed by the core 30 due to the difference in capillary force.

The cushioning material 60 of the third aspect is, for example, the core 3
A material that is softer than 0 and has a large amount of change in the horizontal direction with respect to changes in the vertical direction is used. That is, the buffer material 60 is formed of a material whose inner diameter is easily contracted in the radial direction when it receives an impact and is pressed by the core 30 and compressed. Even in this case, the capillary force of the cushioning material 60 is preferably smaller than that of the core 30, and it is recommended to consider that the ink filled in the core 30 is not filled in the cushioning material 60. In the writing instrument of the present embodiment, when the pen tip 20 side is dropped and dropped,
Due to the impact, the inner diameter of the cushioning material 60 contracts, approaches the ink guide core 23, and spreads in a disk shape. That is, the intermediate hole of the cushioning material 60 contracts to narrow the space 2. Therefore, the core 30
The ink ejected from the space 2 into the space 2 is immediately absorbed by the cushioning material 60. The ink absorbed by the cushioning material 60 is again absorbed by the core material 30 from the cushioning material 60 with the passage of time.

[0024]

According to the present invention, since the cushioning material is attached to the pen tip side of the core, even when the writing instrument falls from the pen tip side, the ejection of ink from the core is small. . Therefore, the writing instrument of the present invention has an effect of lessening the stain on the surroundings when dropped. Further, according to the present invention, there is an effect that the dimensional variation of the core can be absorbed by the cushioning material.

Further, in the inventions according to claims 3 to 5,
Since the ink ejected into the pen tip side holder is absorbed by the cushioning material, the problem of ink dripping from the pen tip is eliminated, and a writing instrument with good usability can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a core holding structure for a writing instrument according to the present invention.

FIG. 2 is a cross-sectional view of a conventional core holding structure for a writing instrument.

3 is a cross-sectional view of FIG. 2, (a) is AA of FIG.
It is sectional drawing, (b) is BB sectional drawing of FIG.

[Explanation of symbols]

 10 Holder 20 Pen tip 30 Core 60 Buffer material

Claims (5)

[Claims] 1. A cylindrical holder having a pen tip attached,
In the core holding structure of a writing instrument that inserts a core filled with ink, on the pen tip side of the core inserted in the holder,
A core holding structure for a writing instrument, wherein a ring-shaped cushioning material is arranged. 2. A core holding structure for a writing instrument, wherein the cushioning material according to claim 1 is formed of foam. 3. A core holding structure for a writing instrument, characterized in that the cushioning material according to claim 1 or 2 is formed of a material having a liquid absorbing capacity and having a capillary force weaker than that of the core. 4. A core holding structure for a writing instrument, characterized in that the cushioning material according to claim 1 or 2 is formed of a material that is continuous cells and is softer than the core and contracts in the length direction. 5. A core holding structure for a writing instrument, wherein the cushioning material according to claim 1 or 2 is formed of a material that is open-celled, softer than the core, and contracts in a radial direction.