JPS6126076Y2 - - Google Patents

Description

[Detailed description of the invention] This invention involves inserting a wire into a hard thin tube made of metal such as stainless steel or ceramics, and ink from an ink cylinder is drawn from the gap formed between the inner peripheral surface of the thin tube and the outer peripheral surface of the wire. The present invention relates to an improvement of a so-called capillary type writing instrument configured to lead out the fluid.

BACKGROUND ART Conventionally, such writing instruments are known and widely used for so-called drafting, in which the tips of the thin tubes are brought into contact perpendicularly with the writing surface.

However, at an appropriate angle (approximately 60 degrees) to the writing instrument.
For normal writing in an inclined state, the stiffness is high because a hard thin tube is used as the pen tip, and the resistance during writing is large, making the writing taste hard and very tiring. It had drawbacks such as a complicated structure and was expensive, making it unsuitable for use.

Several ideas have already been disclosed with the aim of solving these drawbacks and obtaining a capillary writing instrument suitable for ordinary writing that has good ink delivery, smooth continuous writing, and good durability. However, all of them employ a structure in which ink is supplied to the pen tip by capillary action from an ink cylinder in which ink is absorbed by an ink absorbing material.

The purpose of this invention is to securely connect these minute parts and provide a capillary type writing instrument with smooth ink flow.

Next, the details of this invention will be explained with reference to an embodiment according to FIG.

1 is a container body in which an ink cylinder 11 is placed.
is stored. The ink cylinder may be a cylindrical cylinder filled with ink, preferably one in which the ink is absorbed by an ink absorbing material. Reference numeral 12 denotes a small diameter portion connected to the tip of the main body 1, into which the tip tube 2 is fitted or screwed.

A holding hole 21 into which the hard thin tube 3 is tightly fitted is formed at the tip of the tip cylinder 2, and an insertion hole 22 into which the ink guide 5 is tightly fitted is formed at the inner end.
1 is provided with a step 23 on which the thin tube 3 is locked, and the holding hole 21 and the insertion hole 22 are connected to each other from the step 23.
An inner cylinder 2 that fits into the center hole 51 of the inductor 5 concentrically with
4 protrudes inward.

The thin tube 3 is made of metal such as stainless steel or hard ceramics with excellent wear resistance and lubricity, and has a wall thickness of about 0.1 to 0.2 m/m and an inner diameter of 0.2 to 0.2 m/m.
It is formed to have an outer diameter of about 0.8 m/m, ie, an outer diameter of about 0.4 to 1.2 m/m. When the thin tube 3 is made of ceramics, it is preferable to fit a stainless steel pipe around the tube for reinforcement.

Reference numeral 4 denotes an ink guiding wire loosely inserted into the thin tube 3, which is made of a monofilament of a resin with excellent abrasion resistance such as polyamide resin, fluorine resin, polyester resin, carbon fiber reinforced resin, glass fiber reinforced resin, etc. or a plurality of monofilaments, or a plurality of monofilaments twisted into a thread shape, these filaments coated with resin, a metal wire, or a sintered wire of metal oxide, the ends of which protrude inward from the thin tube 3. The end portion 41 is slidably inserted into the thin tube 3 so that its tip protrudes very slightly from the tip surface of the thin tube 3.
It is said that As in the embodiment shown in FIG.
If an elastic tube 43' made of an elastic material such as rubber is provided at the end of the end portion 41 as in the embodiment shown in the figure, there is no risk that the wire body 4 will sink into the ink guide 5 and the center hole 51 It is desirable to have a tight fit.

Reference numeral 5 is an ink derivative, which is a micro-reticular body that produces a capillary phenomenon, such as a fiber bundle or a sintered body of synthetic resin. A bottom portion 52 is formed which is bored in the direction, and the large diameter portion 43 of the wire body 4 is locked therein. has been done. The inner tube 24 of the tip tube 2 is tightly fitted into the center hole 51, and the peripheral wall 53 is tightly fitted between the inner tube 24 and the peripheral wall 25 of the insertion hole 22 of the tip tube 2.
and derivative 5 are firmly integrated. Incidentally, in order to make the integration more reliable, the tip tube 2 and the guide body 5 may be bonded or welded. The end of the inductor 5 is shaped into a conical shape and is thrust into the tip of the ink cylinder 11 to make contact therewith.

To assemble this writing instrument, the thin tube 3 is tightly fitted into the tip tube 2 so as to be in a predetermined position, and the guide 5 into which the wire 4 has been inserted is fitted into the tip tube 2 to assemble the pen point.

In the writing instrument of this invention, the gap 43 between the thin tube 3 and the wire body 4 is so small that the ink flows through it by capillary action, but in the case of the embodiment shown in FIG. It's getting bigger. Therefore, when writing pressure is applied to the wire 4, the pressure can be decomposed into a partial pressure in the vertical direction of the wire 4 and a partial pressure in the horizontal direction, so the end 41 of the wire 4 is Gap 55
The tip 42 is bent inside the tube 3 and the tip 42 sinks into the thin tube 3. When the pen pressure is released, the wire body 4 springs back and becomes straight again, and the tip 42 protrudes outside the thin tube 3 again, and the repetition of vibration moves the ink in the gap 55 toward the tip.

In the case of the embodiment shown in FIG. 2, the wire body 4 presses the elastic cylinder 43' due to writing pressure, and the tip 42 retracts, but when the writing pressure is released, the elastic cylinder 43' and the tip 42 return to their previous positions. Then, the ink moves toward the tip by repeating the appearance and appearance. Therefore, the ink flows out smoothly and smooth writing is possible.

The feature of this invention is that in a writing instrument having the above-mentioned functions, the tip tube 2 and the ink guide 5 can be easily and reliably integrated, the ink flow will not be cut off due to separation of the two, and the thin tube 3, the tip tube 2, and the center hole can be easily integrated. 51 are reliably in a straight line, the vibration or retraction of the wire body 4 is performed accurately, and the ink flow is smoothed. In addition, the assembly process is simple and the cost is low. It also has effects.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway longitudinal sectional view of the present invention, and FIG. 2 is a longitudinal sectional view of the main part of another embodiment. DESCRIPTION OF SYMBOLS 1... Container body, 11... Ink cylinder, 2... Tip tube, 21... Holding hole, 3... Hard thin tube, 22...
...Insertion hole, 4...Ink derivative, 24...Inner cylinder,
5... Ink derivative, 51... Center hole.

Claims (1)

[Scope of utility model registration request] In a capillary type writing instrument in which an ink guide wire is loosely inserted into a central hole of a hard capillary and an ink guide wire connected to the capillary, and the guide is connected to an ink cylinder, the hard capillary is tightly fitted. A tip cylinder is attached to the tip of the container main body, and the tip cylinder has an insertion hole drilled concentrically with the hole and an insertion hole into which the ink dielectric is tightly fitted. A thin tube type writing instrument characterized by a protruding tube.