JP2585712Y2 - Small tube writing instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION A small tube and a needle that slides in the small tube are used as a pen tip, and a temporary ink reservoir is interposed between the pen tip and the ink tank. The present invention relates to a small tube-type writing instrument in which a pressing body fixed to the needle body is loosely inserted into a through hole.

[0002]

2. Description of the Related Art A small-tube type writing implement of the kind described above is a so-called raw ink type small-tube writing instrument of various structures. For example, as a temporary ink reservoir member, a member having a spiral temporary ink reservoir portion formed between the inner wall of the shaft cylinder and a member having a temporary ink reservoir portion having a vertical cross section is used. And others.

[0003] However, there are also places where the structure is quite basic or common. One of them is to form a space in front of the pressing body fixed to the needle body. This space changes its size due to the back and forth movement of the pressing body, but plays an important role in stabilizing the ink dischargeability.

[0004]

That is, although the above-mentioned space serves as a part of the passage of the ink, it often entraps air. Moreover, this air may be easily removed, for example, if it can be moved to an ink tank, but may be stored in a space. The function of the space as an ink passage is impaired, and in severe cases, ink discharge may be interrupted.

[0005] For this reason, the shape of the front part of the pressing body has been devised so as to promptly remove the trapped air. However, the present invention does not provide any other means. Is what you do.

[0006]

According to the present invention, a small tube and a needle sliding in the small tube are used as a pen point, and a temporary ink reservoir is interposed between the pen point and the ink tank. A pressing body fixed to the needle body is loosely inserted into the through hole of the temporary ink reservoir member. In a small tube type writing instrument having a space formed in front of the pressing body, the wall of the space is formed by a metal
The gist of the present invention is a small tube type writing implement made of a ceramic of a metal oxide .

[0007]

1 and 2 show an example (the lower part of the drawing corresponds to the front and the front, and the upper part corresponds to the rear). Reference numeral 1 denotes a small tube, reference numeral 2 denotes a needle body, and the small tube 1 is projected and fixed to a tip holder-3. The tip holder 3 is fixed to the front end of the barrel 4 by press-fitting or fitting of concaves and convexes, and the rear inner hole of the barrel 4 is an ink tank 5. A temporary ink reservoir 6 is inserted and fixed to the rear of the tip holder-3. The illustrated temporary ink reservoir member 6 includes a temporary ink reservoir groove 7, a slit 8, a communication path 9,
10, 11 and a through hole 12.

A pressing body 13 for pressing the needle body 2 forward is loosely inserted into the through hole 12. The pressing body 13 is a front member 14
And a rear member 15. The front member 14 is a synthetic resin injection-molded product or the like. The needle member 2 is fixed to the front part, the rear member 15 is fixed to the rear part, the rear member 15 is made of stainless steel, and the rear part is made of ink. It extends into the tank 5. The pressing body 13 is urged forward by the elastic body 16, but may be a weight that presses the needle body 2 by its own weight. In addition, the whole shape is easily made into a desired shape, so that it is made of two parts, but it is appropriate.

The front part of the pressing body 13 extends from the through hole 12 of the temporary ink reservoir 6 to the inner hole 17 of the tip holder 3, and a space 18 exists in the front part. . That is, in this embodiment, the tip holder 3 is a member forming a space, and the wall of the inner hole 17 is a wall of the space. The point is that the wall is made of a ceramic material.
Ceramic spraying, ceramic sputtering, or, if the material of the tip holder 3 is aluminum, can be appropriately processed by chemical treatment such as γ-alumina conversion with concentrated sulfuric acid. In the case of this example, alumina, zirconia, A conical pot-shaped ceramic member 19 made by injection molding of an appropriate material such as titania or silica is inserted into the inner hole 17 of the chip holder-3. The ceramic member 19 has a through hole 20, and the needle body 2 extends through the through hole 20 into the small tube 1.

The shape of the ceramic member 19 can be appropriately determined. The hexagonal pyramid shown in FIGS. 3 and 4 is one example. In the illustrated ceramic member 19, the rear end is a contact wall that regulates the forward movement position of the pressing body 13. However, for example, the ceramic member 19 may have a shape in which the front part of the pressing body 13 is inserted. Further, it can be formed as one member with the tip holder-3.

Although not shown, various other modifications can be made without departing from the scope of the present invention. For example,
The front end of the illustrated pressing body 13 is planar, but may be formed in an appropriate shape such as a conical shape. Further, a member forming a spiral temporary ink reservoir portion may be used as the temporary ink reservoir member. Further, two or three or more members may be appropriately formed into one member, such as forming the chip holder and the small tube into one member. Furthermore, the temporary ink reservoir member can be a space forming member. In addition, a replaceable ink tank may be used.

[0012]

[Effect of the Invention] The small tube type writing instrument of the present invention is characterized in that the wall of the space in front of the pressing body is made of a metal oxide ceramic,
There are microscopic irregularities on the surface and by the wettability of the goodness of the exceptional ink due to a metal oxide, especially unlikely to adhere to the wall of the ceramic quality of the air the metal oxide, the growth in large bubbles Can be reliably suppressed, and therefore, the accumulation of air in the space can be sufficiently suppressed, and the stability of ink ejection can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is an enlarged view of a pen tip portion of FIG. 1;

FIG. 3 is a longitudinal sectional view showing another example of the shape of the ceramic member.

FIG. 4 is a top view of the ceramic member shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small pipe 2 Needle body 3 Tip holder 4 Shaft cylinder 5 Ink tank 6 Temporary ink storage member 7 Temporary ink storage groove 8 Slit 9 Communication passage 10 Communication passage 11 Communication passage 12 Through hole 13 Pressing member 14 Front member 15 Rear member 16 Repellent body 17 Inner hole of chip holder 18 Space 19 Ceramic member 20 Through hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 60-123274 (JP, U) JP-A 3-77680 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B43K 5/00 B43K 1/06

Claims (1)

(57) [Scope of request for utility model registration] 1. A small ink tube and a needle body that slides in the small tube are used as a pen tip, a temporary ink reservoir is interposed between the pen tip and an ink tank, and a through hole of the temporary ink reservoir is provided. The pressing body fixed to the needle body is loosely inserted into the small tubular writing instrument having a space formed in the front part of the pressing body, wherein the wall of the space is made of metal oxide ceramic.
To become small tube type writing instrument.