JPS5917674Y2 - ballpoint pen - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a ballpoint pen, and its purpose is to improve the ballpoint pen tip rhythm,
It is possible to express thick and thin strokes depending on the pen pressure, and even when strong pen pressure is applied, the elastic deformation of the tip does not apply extra force to the tip end of the ball holding part, and the ball does not fly. In addition, the present invention provides a concrete structure that reduces micro-vibrations on the paper surface and makes it difficult for micro-vibrations to be transmitted directly to the hand when writing.

Traditionally, commercially available ballpoint pens have a ballpoint tip that is simply cylindrical in the shape of a cannonball, and unlike the tips of fountain pens and felt-tip pens, the tip itself is elastic or hydrated. Even though ballpoint pens have the characteristic smoothness of their writing, it is impossible to create thick and thin strokes by adjusting the pressure of the pen, and it is especially difficult to express the so-called tome, spring, and edge of handwriting that Japanese people like.
There remained some dissatisfaction with the writing quality, as it was easy to feel the slight vibrations of the paper directly into the hands.

Recently, ballpoint pen tips made of synthetic resin have become available, and even though the above-mentioned problems have been somewhat resolved due to the elasticity of the resin itself, it is impossible to satisfy the thick and thin handwriting that is particularly preferred by Japanese people. If you apply strong pen pressure to forcefully achieve this, an extremely strong force will be applied to the small end of the ball holding part against the poor elasticity of the tip itself, and since the resin in that part is thin, , he was unable to hold the ball and caused the ball to fly.

As a means to solve these drawbacks of the bow pen, for example, as shown in Japanese Utility Model Application Publication No. 51-140337, a tip is attached to the front part of the shaft made of an elastic plastic material that is slightly bent but has resilience, and a tip is attached to the same tip. A ballpoint pen consisting of a core held within a shaft body is known, but the shaft body has a new structure and conventional products cannot be used, resulting in an increase in cost.

The present invention eliminates the drawbacks of the conventional ballpoint pen tip by forming a small diameter part in the middle part of the ballpoint pen tip compared to the front and rear parts, and by making the small diameter part uniformly elastic in the entire circumferential direction. It is.

Next, each embodiment of the present invention shown in the accompanying drawings will be described.

1 to 6 show a first embodiment, and 1 is a ballpoint pen tip made of synthetic resin such as polyacetal resin, and the ballpoint pen tip 1 holds a ball A and has an ink flow channel inside. a chip front part 2 having a hole 21 therein;
A chip rear part 3 having a retaining part 32 for attaching to the shaft body 7 and having a through hole 31 through which an ink relay core 6 to be described later is inserted, and the chip front part 2 and rear part 3 are integrated. It consists of a small diameter part 4 that connects.

Reference numeral 6 denotes an ink relay core made of an appropriate material such as a fiber bundle, a resin sintered body, or a resin narrow rod having an ink flow path, which is inserted into the through hole 31 of the tip rear part 3 and is inserted into the outer periphery of the narrow diameter part 4. The rear end is in contact with the ink storage body B in the shaft body 7.

Of course, instead of the ink storage body B, a type that leads ink from a raw ink chamber may also be used.

This ink relay core has two through holes formed around the central base 33 as shown in FIG. .62
A groove 6 is provided in the middle part to ensure space for the center base 33 formed in the rear part 3 of the chip.
3, for example, as shown in FIG. 6a or 6b, it is also possible to form a through hole 64 without providing a groove or by making a cut from one side and having a through hole 64 in which the base 33 is located at the base end. be.

Since the ballpoint pen of the present invention is constructed as described above, when holding the shaft body 7 and writing, the thin diameter portion of the tip 1
When writing with pressure that does not cause deformation, it is possible to write with the medium l shown in Figure 4, but if stronger pressure is applied, elastic deformation of the narrow diameter portion 4 occurs, as shown in Figure 5. The position of the tip of the tip on the writing surface changes.

In other words, the gap between the tip of the tip and the writing surface is narrower than in the state shown in Figure 4, and the ink that comes out from inside the tip due to the rotation of the ball enters the gap, resulting in a width 1 larger than l in the handwriting in Figure 4. You will be able to write with □.

In this way, depending on how much pressure is applied when writing, it is possible to express thick and thin handwriting, and it is possible to prevent slight vibrations from being transmitted to the hand when writing, and even when strong writing pressure is applied, the ball will elastically deform. Since the force exerted on the edge of the tip of the holding portion is dispersed, it has the effect of making it difficult for the ball to fly.

In particular, according to the present invention, since the narrow diameter part 4 of the tip is located at the center of the tip, it can be deformed uniformly in the entire circumference direction, and the ball can be held at the tip of a conventional fountain pen type plate nib. The drawbacks of the other types of directional writing are overcome, and thick and thin writing can be achieved by increasing and decreasing the writing pressure in any direction.

FIG. 7 shows a second embodiment of the present invention, in which the ballpoint pen tip 1
A narrow diameter part 14 is formed in the rear intermediate part from the front part 12 of 1,
The ballpoint pen tip 11 is made to have uniform elasticity in the entire circumferential direction, a ball A' is attached to the tip, an ink relay core 16 is inserted into the tip center hole, and the base of the ballpoint pen tip 11 is attached to the shaft body 17.

The operation and effect are the same as in the first embodiment.

According to the present invention, a small diameter part is formed in the middle part of a ballpoint pen tip with a ball rotatably attached to the tip so as to have uniform elasticity in the entire circumference direction, and the ink is drawn out into the tip. Since the relay core is internally installed and the base of the chip is attached to the shaft body, the same shaft body as the conventional product can be used, resulting in lower cost.

In the above explanation, the entire ballpoint pen tip is made of synthetic resin, but the ball-holding part (the front part of the tip) is made of metal, the narrow diameter part is made of synthetic resin, and both parts are press-fitted. Alternatively, they may be integrated into a ballpoint pen tip by an appropriate method such as adhesion.

In the case of the first embodiment, only the narrow diameter portion may be made of synthetic resin or metal, and both ends thereof may be fixed to the front and rear portions of the chip by press fitting, adhesive, etc.

Furthermore, in the first embodiment, since the ink relay core is exposed in the middle part of the chip, its outer periphery may be covered with a moisture-proof material in consideration of ink drying, ink leakage, etc. A shielding layer made of rubber or synthetic resin may be provided on the outer periphery.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the main part of the first embodiment of the present invention, Fig. 2a
Figures 2b and 2b are cross-sectional views along the X-X and Y-Y lines in Figure 1, Figure 3 is a perspective view of the ballpoint pen tip and ink relay core in Figure 1 before they are assembled, and Figure 4 is a cross-sectional view of Figure 1. Figure 1 is a front view of the main part when the ballpoint pen tip is not elastically deformed, Figure 5 is a front view of the main part when the ballpoint pen tip is not elastically deformed.
A front view of the main part when the chip shown in the figure is elastically deformed, Figure 6a,
FIG. 6b is another embodiment of the ink relay core, and FIG. 7 is a partially cutaway front view of the second embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] A small diameter part is formed in the middle of the ballpoint pen tip, which has a ball rotatably attached to the tip, so that it has uniform elasticity in the entire circumference direction, and an ink relay core is built into the tip to draw out ink into the tip. A ballpoint pen in which the base of the tip is attached to the shaft body.