JPS5916227Y2 - ballpoint pen - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a ballpoint pen.The purpose of this invention is to make the ballpoint pen tip elastic, so that it can express thick and thin handwriting according to the pressure of the pen, and also to create a ballpoint pen with strong strokes. Due to the elastic deformation of the tip even when pressure is applied, no extra force is applied to the tip end of the ball holding part, preventing the ball from flying, and also reduces slight vibrations on the paper surface when writing.
This provides a concrete structure that prevents micro-vibrations from being transmitted directly to the hand.

Conventionally, as shown in Japanese Unexamined Patent Publication No. 51-125538, a core made of resilient plastic with a tip press-fitted at the tip is sealed in a barrel, and the tip of the barrel is bent around a connecting part as a fulcrum. A ballpoint pen is known that has a flexible cutout and can open and close the cutout to provide a hard or soft writing feel. The disadvantage is that the structure is complicated and expensive.

In the present invention, a notch is provided on the side surface of the ballpoint pen tip by leaving an elongated vertical rib, and the rib provides elasticity to the tip itself, thereby eliminating the drawbacks of the conventional pen tip.

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

Reference numeral 1 denotes a ballpoint pen tip made of synthetic resin such as polyacetal resin, and the tip 10 has an elongated vertical rib 1a left on both sides of the cylindrical middle portion and a rectangular window hole 1b formed therein.

A ball 2 is rotatably attached to the tip of the tip 1, and an ink relay core 3 made of a suitable material is inserted in the center of the tip to guide the ink inside the barrel body 4 to the ball. ing.

The base of the tip is attached to the tip of the barrel main body 4 by appropriate means such as tight fitting.

Therefore, as shown in FIG. 1, when writing by holding the uniaxial cylinder main body 4 so that the vertical ribs 1a are located on both sides of the writing surface, that is, so that the window hole 1b faces the writing surface. , when writing with pressure that does not deform the vertical rib 1a, it is possible to write with the stroke L shown in Figure 1, but when stronger pressure is applied, elastic deformation of the vertical rib 1a occurs as shown in Figure 2. , the position of the tip end portion on the writing surface 5 changes.

In other words, the distance between the tip end of the tip and the writing surface 5 becomes narrower than in the state shown in FIG. You will be able to write with .

In this way, it is possible to express thick and thin handwriting by applying pressure when writing, and even when writing, micro vibrations are transmitted to the hand. 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, when the vertical rib 1a exists at the position shown in FIG.
The vertical rib 1a is the most elastically deformable, and the thickness of the handwriting is most noticeable depending on the pressure level.However, when the vertical rib 1a is placed to face the writing surface, the tip is
When rotated by 0°, the elastic deformation of the vertical ribs 1a becomes more difficult than in the state shown in Figure 1, so although it can be said that the vertical ribs 1a are elastically deformed in any direction, when the vertical ribs 1a are on both sides of the chip, there are two In the case of -, two extreme types of writing feel can be obtained.

Note that three or more ribs may be formed around the cylindrical center of the ballpoint pen tip, and by doing so, it is possible to obtain almost even strokes of thick and thin strokes by increasing and decreasing the writing pressure in any direction. can.

In addition to the above-mentioned effects, the present invention has a simple structure and can be mass-produced at low cost.

In the above explanation, the entire ballpoint pen tip is made of synthetic resin, but the ball-holding part is metal and the rib forming part is synthetic resin, and the two parts can be integrated by press-fitting, gluing, or other suitable method. Of course, you can use it as a ballpoint pen tip.

Also, since the ink relay core is exposed inside the window hole of the chip, its outer periphery may be covered with a moisture-proof material to prevent the ink from drying or, conversely, from ink leakage from the window hole. A synthetic resin thin film may be formed integrally with the vertical ribs in the hole portions.

[Brief explanation of the drawing]

Figure 1 is a front view of the main part of an embodiment of the present invention when the chip is not elastically deformed, Figure 2 is a cross-sectional view taken along line A-A in Figure 1, and Figure 3 is when the chip in Figure 1 is elastically deformed. FIG. 1...ballpoint pen tip, 1a...vertical rib, 1b...window hole, 2...ball,
3... Relay core, 4... Shaft cylinder body.

Claims (1)

[Scope of utility model registration request] A notch is formed in the cylindrical middle part of a ballpoint pen tip with a ball rotatably attached to the tip, leaving two or more vertical ribs, and an ink relay core is installed inside the tip to draw out ink. A ballpoint pen with the base of the tip attached to the barrel body.