JPH0136637Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a metal pipe nib. Particularly suitable is the case for fine handwriting.

Using the case of the pen tip of a small tube type writing instrument as an example, problems when using it for fine handwriting will be explained.

The first problem is due to molding. In order to use fine handwriting, the inner hole serving as the ink passage must have a small diameter. On the other hand, in order to resist bending when a writing load is applied, it is better to have a larger outer diameter. At first glance, it seems that there will be no problem if a thick-walled pipe is used and the tip is pointed for fine handwriting. However, if the diameter of the inner hole is e.g.
When it becomes as thin as 0.1mm, it becomes difficult to form the actual molding.
In order to set the diameter of the inner hole, drawing is performed from the outside, but the thicker the wall, the harder it is to obtain a well-defined inner hole. In other words, an inner hole with a perfect circular cross section may turn out to be a distorted circle, or a center hole may turn out to be a distorted circle.
It becomes biased. Even if only the point of the tip is considered, the inner hole is not necessarily located in the pointed portion as desired. Therefore, if it is used for fine handwriting, the outer diameter will also be thinner, making it easier to bend.

The second problem is a decrease in wear resistance. Since it is used for fine handwriting, the area of contact with the writing surface must also be small. Even if the writing load is constant, the smaller the contact area, the greater the pressure, and therefore the easier it will be to wear out. Metals have better wear resistance than synthetic resins, but paper, for example, behaves like sandpaper.

The third problem, which is related to the second problem, is that measures to improve wear resistance often impair aesthetic appearance. Physical vapor deposition methods such as sputtering and ion plating, which have become popular in recent years, are capable of depositing materials that have more wear resistance than conventional chrome plating, such as titanium, chromium, tungsten, etc.
Since it can form a film of oxides or nitrides such as aluminum or tantalum, it can be preferably used as a treatment for the tip of the pen tip, but in order to reduce the unit price and mass-produce it, multiple pen nibs should be placed close together or bundled. If conditions are set to obtain a film with good abrasion resistance, and the treatment is performed so that particles and ions fly toward the tip of the nib, which is the target for improving abrasion resistance, the formation of a film on the peripheral wall of the nib will not occur. It becomes uniform, and for example, dark striped stains appear.

The present invention was developed in view of the above points. Hereinafter, a description will be given based on an embodiment shown in the accompanying drawings.

Reference numbers A and B are pipes, 1 is a chip to which they are attached, 2 is a needle inserted loosely so as to slide on pipe A, and 3 is a falling weight fixed to give sliding force to the needle. It is. That is, this example is an example of a small tube type writing instrument.

The pipes A and B are made of metal such as stainless steel, and are both thin-walled, but by overlapping them, they are made strong against bending like thick-walled pipes. For example, for a handwriting width of 0.1 mm or 0.2 mm, pipes A and B each have an outer diameter of approximately 0.3 mm.
As mentioned above, if you use mm or 0.5 mm. Further, although the tip a of the pipe A that protrudes from the pipe B is pointed, the pipe A is thin, which shows that the problem of incorrect positioning of the inner hole can be suppressed.

As shown in an enlarged view in FIG. 2, a wear-resistant coating 4 is formed on the tip a of the pipe A by physical vapor deposition. The coating 4 is formed at a thickness such as 5 μm, 10 μm, or more to sufficiently exhibit abrasion resistance at the tip of the point, that is, the part that comes into contact with the writing surface. , for example, 1 μm or 2 μm on the side wall of pipe A.
It is thin, as if it were about 100cm or less, and it gradually ceases to be formed as it moves towards the rear.
This process causes the stains mentioned above. However, since the pipe B that protrudes from the tip of the pipe A covers the coating 4, even if the stain occurs, it does not appear to be visible.
It hasn't appeared. Here, although pipe A and pipe B are drawn in the drawing as being in close contact with each other through a film, it is also possible to use adhesive, for example, instead of press-fitting. Although there may be a slight gap between it and pipe B,
It can be said that there is no difference in appearance.

As is clear from the above, the metal pipe nib of the present invention has both a writing contact part with excellent wear resistance and bending strength against writing load, and furthermore,
There is little variation in molding and the quality is stable,
It can be used as a pen nib with excellent aesthetic appearance.

Note that various modifications can be made without departing from the gist of the present invention; for example, the surface of the pipe B may be plated with gold or the like.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is an enlarged view of the Z section of FIG. 1. A, B...pipe, a...tip of pipe A,
1... Chip, 2... Needle body, 3... Falling weight, 4...
Abrasion resistant coating.

Claims (1)

[Scope of utility model registration request] A thin metal pipe B is superimposed on the outer periphery of a thin metal pipe A whose tip has a wear-resistant coating formed by physical vapor deposition so that the tip of the pipe A protrudes and covers the wear-resistant coating. A metal pipe nib.