JPH06286385A - Writing tool - Google Patents

Abstract

PURPOSE:To obtain easily portable and writable delivery type ball writing tool, the ink storage tube of which does not become smaller even when the storage amount of ink become smaller by use and remains as large as it is under unused state. CONSTITUTION:In the writing tool 16 concerned, an ink delivery port 14 is closed by a ball 13, which is pressed by a spring 12 from the inside of an ink storage tube 11 and some part of which projects outside the ink delivery port 14 in order to form a pen point 15. In addition, a cap 18, between which and the penpoint 15 an air chamber 17 is formed, is mounted to the ink storage tube 11 under the state being in closely contact with the tube 11. Further, a vent hole 23 is made at the portion forming the peripheral wall of the air chamber 17 of the cap 18. The tubular main body 19 of the ink storage tube 11 is made of plastic, while the peripheral wall 23 in the periphery of the vent hole 22 of the cap 18 has flexibility and deforms elastically so as to give the shape, which allows to change the interior volume of the air chamber 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a ball mounted inside an ink reservoir to close an ink discharge port, and a part of the ball projects outside the ink discharge port to form a brush tip. It concerns writing instruments.

[0002]

2. Description of the Related Art Ink to be filled in a writing instrument having a writing tip made of a ball (hereinafter referred to as a ball writing instrument) has a high viscosity and does not spontaneously flow out even if a gap is formed between the ink ejection port and the ball. There are two types, a liquid type and a liquid type whose viscosity is extremely low so as to spontaneously flow out from the gap. A ball-point writing instrument filled with pasty ink is known as a "ball-point pen", and it is not necessary to make the ink storage cylinder flexible, and it is also possible to form the ink storage cylinder with a hard cylinder such as a metal pipe. Since it is highly viscous and does not spontaneously flow out, it is not necessary to close the end of the ink storage cylinder to seal the inside, and no spring for pressing the ball from the inside of the ink storage cylinder to the ink discharge port. On the other hand, with a ball writing instrument filled with liquid ink, the end of the ink storage cylinder is closed to seal the inside so that the ink does not flow out spontaneously, and the ball is pressed against the ink discharge port from the inside of the ink storage cylinder to discharge the ink. It is necessary to install a spring for sealing the inside of the ink reservoir.

In the latter case, that is, in the case of a ball writing instrument in which the ink storage cylinder is airtight (hereinafter referred to as a discharge type ball writing instrument),
If the amount of ink used decreases, the internal pressure of the ink storage cylinder will be reduced by the amount of the decreased amount of ink used, and it will be difficult for ink to flow out. It becomes necessary to reduce the volume and balance the atmospheric pressure inside and outside. Therefore, the ink storage cylinder of the discharge type ball writing instrument, like toothpaste in a tube,
A tube that can be deformed at any time depending on the amount of ink stored inside is used.

[0004]

There are plastic and rubber tubes that can be used in the ink storage tube of the discharge type ball writing instrument. However, the discharge type ball writing instrument is a plastic film other than paper or a piece of cloth. Many of them are used for special purposes such as writing lot numbers and product numbers, etc., or drawing a printing sketch, etc., and various organic solvents, water repellents, waterproofing agents, printing agents, alkali, In many cases, various chemicals such as acids and bleaching agents are mixed depending on the application, and in order to prevent alteration and corrosion of the tube, permeation and volatilization of ink composition, etc., the tube has a chemical resistance on the front and back of the metal foil. A metal laminated tube laminated with a flexible plastic is used, and a tube made of plastic or rubber alone is not practical.

However, if a metal laminate tube, such as a toothpaste tube, which can be deformed at any time according to the amount of ink stored therein, is used for the ink storage cylinder, the internal volume is reduced according to the amount of ink used to balance the internal and external atmospheric pressures. However, the ejection type ball writing instrument becomes difficult to write because the ink storage cylinder becomes gradually smaller or becomes a soft flat plate shape and becomes difficult to hold according to the use.

Therefore, according to the present invention, the ink storage cylinder does not become small even if the ink storage amount is reduced by use,
An object of the present invention is to obtain a discharge type ball writing instrument which is thick and bulged like an unused one and is easy to hold and write.

[0007]

That is, a discharge type ball writing instrument 16 (hereinafter, simply referred to as a writing instrument) according to the present invention is provided.
(A) The ink discharge port 14 is closed by the ball 13 pressed from the inside of the ink storage cylinder 11 by the spring 12, and a part of the ball 13 projects outside the ink discharge port 14 to form the brush tip 15. Writing instrument 1
6 includes (b) a cap 18 which is in close contact with the ink storage cylinder 11 and forms an air chamber 17 between the ink storage cylinder 11 and the brush tip 15, and (c) a cylindrical main body 19 of the ink storage cylinder 11 is formed of plastic. (D) The air chamber 1 is attached to a portion 21 other than the contact portion 20 of the cap 18 which is in close contact with the ink storage cylinder and which forms the peripheral wall of the air chamber 17.
7 has a vent hole 23 leading to (7) the vent hole 22.
The peripheral wall 23 around is shaped to have flexibility and elastically deform to change the internal volume of the air chamber 17.

The cap 18 may be tightly fitted to the tubular body 19 or may be screwed thereto, and the shape of the cap 18 may be a tubular body having an outer diameter similar to that of the tubular body 19. Good. The ventilation hole 22 is formed in the cylindrical main body 1 that passes through the ink discharge port 14 when the cap 18 is covered with the brush tip 15.
It is advisable to attach it so that it is located on the axis of the shaft 9.

[0009]

EXAMPLES FIGS. 1 to 3 show an example of the present invention in which ink 2 is used.
A laminated tube having an aluminum layer inside is used for the cylindrical main body 19 that stores 4 and both ends thereof are covered with a lid material 2.
It was closed on May 26.

A pipe-shaped ink outlet 27 projects from the tip side lid member 25, and a male thread is engraved on the peripheral surface of the outlet 27, and a corresponding male thread is engraved. The brush tip cap 28 is screwed on. Tubular body 19
An ink discharge port 14 is opened at the tip of a brush tip cap 28 through which the axis of the ink is discharged, and a ball 13 is fitted into the ink discharge port 14 from the inside. Ink outlet 27
A spring 12 is mounted between the ink ejection port 14 and the ink ejection port 14, and the spring 12 presses the ball 13 toward the inside of the ink ejection port 14.

The lid member 26 on the rear end side is fitted in and fused to the tubular body 19, and a ventilation hole 29 having a taper is provided on the axis of the tubular body 19, and the ventilation hole 29 is provided. Is the brush tip 1
As in the case of No. 5, it is closed by a ball 31 which is fitted from the inside of the tubular body 19 and pressed against the spring 30. Reference numeral 32 is a pedestal for fixing the spring 30 to the lid member 26, and a ventilation hole 33 is opened in the central portion. Lid material 2
A hemispherical rubber cap 34 is put on the rear end of the tubular body 19 closed by 6. A vent hole 35 is opened at the top of the rubber cap 34.

When the rubber cap 34 is pushed by pressing the vent hole 35 with the finger 36, the rubber cap 34 is dented to increase the internal air pressure, and the air pressure pushes the ball 31 into the inside of the cylindrical main body 19. Therefore, the air in the rubber cap is injected into the ink storage cylinder 11 through the ventilation holes 29 and 33. Then, when the finger 36 is released, the vent hole 35 opens, and the elastic recovery force of the rubber cap 34 swells to the original hemispherical shape, and at that time, air enters from the vent hole 35 into the rubber cap. Thus, the rubber cap 34 serves as a pump for injecting air into the ink storage cylinder 11.

The cap 18 to be put on the tip of the brush is a cylindrical body 1
It is made of a cylindrical plastic that fits tightly to the peripheral surface 37 of 9 and has a hemispherical shape on the tip side. In a state where the tip end portion 21 of the cap is mounted on the tubular main body 19 while being covered with the brush tip 15, a projection 38 projects from the inside of the position where the axial center of the tubular main body 19 passes, and the central portion of the projection 38. A ventilation hole 22 communicating with the inside and outside of the cap 18 is opened in the. A spring 39 is attached to the protrusion 38, and a cap-shaped pressing member 40 is attached to the tip of the spring 39.
The protrusion 38, the spring 39, and the pressing member 40 are arranged side by side on the axis of the tubular body 19, and the pressing member 40 and the writing tip 1
The distance between 5 is slightly apart.

Around the ventilation hole 22 of the hemispherical tip portion 21, a thin peripheral wall 23 is formed. When the ventilation hole 22 is pressed by the finger 41 and pushed toward the writing tip side (15), the hemispherical tip portion 2 is formed.
1, the internal pressure of the air chamber 17 in the cap rises, and at that time, the pressing member 40 pushes the ball 13 of the writing tip, so that a slight gap is formed between the ball 13 and the ink discharge port 14, and from the gap, the air chamber is opened. The air of 17 is injected into the ink storage cylinder 11. Next, when the finger 41 is released, the vent hole 22 opens, and the hemispherical tip portion 21 swells up to the original hemispherical shape by the elastic recovery force of the surrounding peripheral wall 23, and at that time, the air chamber 17 in the cap from the vent hole 22.
The air enters. In this way, the cap 18 functions as a pump for injecting air into the ink storage cylinder 11 like the rubber cap 34.

In the writing instrument 16, the tubular body 19 is composed of a flexible laminated tube, and the finger 4
When the brush tip 15 is pressed against a piece of cloth while raising the pressure in the ink storage cylinder 11 by grasping it with 2.43, the ball 13 is pushed back by the reaction force from the piece of cloth or the like, and the ball 13 and the ink discharge port 14 are slightly separated. A gap is formed, and the ink 24 flows out from the gap and is written.

When the ink is used in this manner and the amount of ink is reduced, the cylindrical body 19 is deformed by the amount of the reduced amount of ink used, and the internal volume of the ink reservoir is reduced. At that time, the cap 18 and the rubber cap 34 are used. By the ink storage cylinder 11
When air is infused, the tubular body 19 returns to its original thick and swelled state, so that the writing instrument 16 does not gradually become difficult to hold or write as it is used.

[0017]

As described above, the writing instrument 16 according to the present invention is
Since the cylindrical main body 19 to be grasped by the fingers 42 and 43 can be maintained in a thick and swelled state that is easy to grasp, it does not become difficult to hold and difficult to write as the amount of ink 24 stored decreases. Thus, according to the invention, the ink 24
Even when the storage amount of the ink is reduced, the ink storage cylinder 11 does not become small, and it is possible to obtain the discharge type ball writing instrument 16 which is thick and bulged like an unused one and is easy to hold and write.

In the embodiment, the cap 18 is tightly fitted to the peripheral surface 37 of the tubular body 19 and covers the writing tip 15, but the cap 18 is similar to the writing tip cap 28 in that the tubular body 19 and the writing tip. It may be screwed onto the cap 28 to cover the brush tip 15, or may be tightly fitted to the peripheral surface of the brush tip cap 28 to cover the brush tip 15.

[Brief description of drawings]

FIG. 1 is a sectional front view of a main part of a writing instrument according to the present invention.

FIG. 2 is a sectional front view of a main part of a writing instrument according to the present invention.

FIG. 3 is a sectional front view of a main part of a writing instrument according to the present invention.

[Explanation of symbols]

 11 Ink Storage Tube 12 Spring 13 Ball 14 Ink Discharge Port 15 Writing Point 16 Writing Tool 17 Air Chamber 18 Cap 19 Cylindrical Body 20 Adhesion Part 21 Hemispherical Tip 22 Vent Hole 23 Peripheral Wall 24 Ink 25 Cover Material 26 Cover Material 27 Ink Outlet Port 28 Brush tip cap 29 Vent hole 30 Spring 31 Ball 32 Pedestal 33 Vent hole 34 Rubber cap 35 Vent hole 36 Finger 37 Circumferential surface 38 Protrusion 39 Spring 40 Pressing member 41 Finger 42 Finger 43 Finger

Claims (1)

[Claims] (A) The ink discharge port 14 is closed by a ball 13 pressed by a spring 12 from the inside of the ink storage cylinder 11, and a part of the ball 13 protrudes to the outside of the ink discharge port 14 and a brush tip 15 is formed. In the writing instrument 16 forming the ink storage cylinder 11, (b) a cap 18 that is in close contact with the ink storage cylinder 11 and forms an air chamber 17 between the ink storage cylinder 11 and the ink storage cylinder 11, and
9 is made of plastic, and (d) is a portion 21 other than the close contact portion 20 of the cap 18 which is in close contact with the ink storage cylinder and which forms the peripheral wall of the air chamber 17.
And a peripheral wall 23 around the ventilation hole 22 is flexible and elastically deformed to change the internal volume of the air chamber 17. Writing instrument characterized by being.