JP2000225793A - Aqueous ink ballpoint pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aqueous ink ballpoint pen capable of completely commonly using a marker and a cap and adapted to an assembly writing instrument or the like. SOLUTION: In the aqueous ink ballpoint pen comprising a ballpoint pen refill 10 directly filled in an ink cylinder 11 with an aqueous ink L and mounted in a barrel 20, and a sealing member 5 made of a soft elastic material disposed in a cap 40 to seal a top of a tip 13 when the cap 40 is mounted at the barrel, gastight parts 22, 41 for gastightly sealing when the cap is mounted at the barrel are respectively formed on an inner periphery of a mating port of the cap and an outer periphery of the barrel, and an air inlet hole 23 and an air outlet hole 24 are respectively formed at front and rear sides of the gastight parts of the barrel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based ballpoint pen suitable for a group writing tool which is sold with a uniform external design of a plurality of writing tools of different types such as a ballpoint pen, a mechanical pencil and a marker.

[0002]

2. Description of the Related Art As typical examples of writing instruments, ballpoint pens, mechanical pencils, markers and the like can be cited. The external designs of a plurality of these different writing instruments are unified as much as possible, and these writing instruments are stored in a writing instrument case. May be sold as a writing instrument. Such a braided writing instrument has the advantage of being able to produce efficiently, since external parts such as a barrel and a cap can be shared. Also,
Even if it is not a braided writing implement, if different types of writing implements, such as a ballpoint pen and a marker, are used in common, the productivity will be improved accordingly.

[0003]

As described above, in a braided writing implement and the like, external components such as a shaft cylinder and a cap are used in common, but the internal mechanism greatly differs depending on the type of the writing implement. Since the functions to be performed are different,
Even if the design of the external parts is shared, it may be difficult to completely share the internal structure.

An aqueous ballpoint pen in which a water-based ink is directly filled into an ink cylinder and a ballpoint pen refill in which a grease-like backflow preventing agent is arranged on the tail end side of the ink is mounted in the shaft cylinder. The cap prevents the ink from evaporating from the tip of the tip. In the sealed space, the air in the cap, which has been compressed to a high pressure when the cap is mounted, enters the ink cylinder from the tip of the chip. Then, when air enters the ink cylinder, the air in the ink cylinder expands due to a rise in temperature, causing ink dropping or defective ink ejection. In addition, when air is present in the ink cylinder when the chip is turned upward, there is a danger that the ink head will be hit by the backflow preventing agent and the backflow preventing agent will be broken, and the ink will flow back and flow out of the ink cylinder.

For this reason, in such an aqueous ball-point pen, a sealing member made of a soft elastic material is disposed in the cap, and a mating portion of the cap is engaged with the outer peripheral surface of the barrel so as to be ventilated. Sometimes the inside of the cap is not pressurized, and only the tip of the chip is sealed by the seal member.

[0006] On the other hand, an ink occluding body called a batting containing ink is arranged in a shaft cylinder, and this ink is supplied to a rod-shaped plastic pen body for writing, and only the stick-shaped plastic pen body is sealed. Therefore, an airtight portion is formed on the abutment portion of the cap and the outer peripheral surface of the barrel so as to be tightly sealed when the cap is mounted on the barrel, so that the inside of the cap is a sealed space. In the case of a marker, there is no problem even if air pressurized when the cap is attached enters the shaft cylinder.

As described above, since the functions required for the caps of the water-based ball-point pen and the marker are different, the internal structure is necessarily different even if the external appearance is shared. Therefore, the water-based ballpoint pen and the marker cap could not be completely shared.

Accordingly, an object of the present invention is to provide a water-based ballpoint pen which can completely use a marker and a cap and is suitable for a writing instrument such as a braid.

[0009]

In order to achieve the above object, the present invention provides a ball-point pen refill in which water-based ink is directly filled in an ink cylinder, which is mounted in the cylinder, and the tip of the pen refill is mounted on the cylinder. When the cap projects from the tip opening and the cap is attached to the barrel, the sealing member made of a soft elastic body disposed in the cap seals the tip of the tip. On the surface, an airtight portion that tightly adheres when the cap is mounted on the barrel is formed, and an air inlet hole and an air outlet hole are formed before and after the airtight portion of the barrel. Of the air enters the barrel through the air inlet hole and is discharged to the outside through the air outlet hole.

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. In FIG. 1, a joint 1 is provided at the tip of an ink cylinder 11 of a ballpoint pen refill 10.
The chip 13 is fixed via the connection 2. Chip 13
Is formed in a shell shape with stainless steel, and a ball 14 is rotatably held in a ball house at the tip with a part of the ball 14 protruding. A small spring (not shown) having a spring force of about 40 g is arranged in the chip 13, and this spring rebounds the ball 14 to make the chip 1.
3 and the ball 14 and the tip 1
The valve mechanism is constituted by the inward leading edge 3.

An aqueous ink L is directly filled in an ink cylinder 11 formed of a transparent or translucent synthetic resin. The water-based ink L is a gel ink that has a high viscosity in a static manner, but is reduced in viscosity by the rotation of the ball 14 and can flow out. The tail end side of the aqueous ink L is sealed with a grease-like backflow preventing agent 15. A rod-like piece 16 having a specific gravity substantially equal to that of the backflow preventing agent 15 is disposed inside the backflow preventing agent 15.
The anti-reflux agent 15 moves together with the piece 16 as it is consumed.

The ballpoint pen feel 10 is used as the barrel 2
0. That is, the ballpoint pen refill 10 inserted into the barrel 20 is repelled forward by the spring 31 arranged in the tail plug 30 fitted to the tail end of the barrel 20, and the tip 13 of the ballpoint refill 10 is displaced. Shaft barrel 2
It is possible to write by protruding from the front end opening of the front end portion 21 at the front end.

When not in use, the cap 40 is attached to the tip of the barrel 20. In the cap 40, a spherical sealing member 50 made of a soft elastic material such as silicon rubber is disposed. At the time of mounting, the tip of the tip 13 is sealed by the sealing member 50 so that the ink does not evaporate from the tip of the tip 13.

The cap 40 is used in common with a marker cap having a rod-shaped pen body.
A contact portion 41 is formed on the inner peripheral surface on the abutment side of the contact portion 41 so as to be in close contact with the contact portion 22 of the barrel 20. That is, when the cap 40 is attached, the contact portion 22 of the barrel 20 and the cap 40
When the cap 40 is used as a cap for the marker, the sealed space prevents the ink from evaporating from the pen-shaped pen body of the marker. It is supposed to.

A front end portion 2 located forward of the contact portion 20 of the shaft cylinder 20
As shown in FIGS. 2 and 3, three air inflow holes 23 are formed in 1. Further, two air outflow holes 24 are formed in the barrel 20 behind the close contact portion 20, as shown in FIGS. That is, the air inlet 23 and the air outlet 24 are formed before and after the airtight portion 22 of the barrel 20.

As shown in FIGS. 2 and 4, three vertical ribs 25 are formed in the barrel 20 behind the front opening 21, and the ballpoint pen refill 1 mounted in the barrel 20 is formed.
0 is positioned with the step of the joint 12 abutting against the rear edge of the vertical rib 25 and receiving the resilient force of the spring 31. However, even if the ballpoint pen refill 10 is mounted in the barrel 20, In addition, the space between the air inlet hole 23 and the air outlet hole 24 is not completely shut off by the joint 12, so that the air inlet hole 23 and the air outlet hole 24 are kept in communication.

When the cap 40 is attached to the tip of the barrel 20, the end of the contact portion 22 of the barrel 20 and the end of the contact portion 41 of the cap 40 start to come into contact with each other in the process. When the mounting is completed by completely pushing the tip 40, the tip of the tip 13 is sealed by the sealing member 50. In the process of mounting the cap, the volume of the closed space in the cap 40 is reduced, so that the air inside the cap 40 is pressurized. As a result, the pressurized air enters the barrel 20 through the air inlet 23 and is discharged from the barrel 20 through the air outlet 24. Therefore, the air in the cap 40 hardly reaches a high pressure, and the air flows from the tip of the tip 13 before being sealed by the seal member 50 to the ink cylinder 11.
Never get inside.

As described above, the contact portion 22 of the barrel 20 and the contact portion 41 formed at the abutment portion of the cap 40 are air-tightly contacted to form a sealed space inside the cap 40, and the ink is removed from the pen-shaped pen body of the marker. Even if it prevents evaporation of
The air inflow hole 23 and the air outflow hole 2
Since No. 4 was formed, it can also be used as a cap for an aqueous ballpoint pen.

[0019]

As described above, according to the present invention, a ballpoint pen refill in which aqueous ink is directly filled in an ink cylinder is mounted in the cylinder, and the tip of the pen refill projects from the tip end opening of the cylinder and the cap When attached to the barrel, in a water-based ballpoint pen in which a sealing member made of a soft elastic body disposed in the cap seals the tip of the tip,
An airtight portion is formed on the inner peripheral surface of the abutment portion of the cap and the outer peripheral surface of the barrel so as to be airtight when the cap is mounted on the barrel. An outflow hole is formed so that the compressed air inside the cap when the cap is attached enters the barrel through the air inflow hole and is released outside through the air outflow hole, so that the marker and cap can be completely shared. Thus, a water-based ballpoint pen suitable for a writing instrument or the like can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a main part of the barrel.

FIG. 3 is a cross-sectional view taken along line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a sectional view taken along line CC of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ball-point pen refill 11 Ink cylinder 12 Joint 13 Chip 14 Ball 15 Backflow preventive agent 16 Piece 20 Shaft cylinder 21 Front opening part 22 Close contact part of Shaft cylinder 23 Air inflow hole 24 Air outflow hole 25 Vertical rib 30 Cap 31 Spring 40 Cap 41 Cap Adhesion part of 50 Seal member L Water-based ink

Claims (1)

[Claims] 1. A ball-point pen refill in which water-based ink is directly filled in an ink cylinder is mounted in the cylinder, and a tip of the ball-point pen refill projects from a tip opening of the cylinder. In a water-based ball-point pen in which a sealing member made of a soft elastic body disposed seals the tip of a tip, the cap is airtightly adhered to the inner peripheral surface of the abutment portion of the cap and the outer peripheral surface of the barrel when the cap is attached to the barrel. An air inflow port and an air outflow port are formed before and after the airtight portion of the barrel, and the air in the cap compressed when the cap is attached enters the barrel through the air inflow port. ,
An aqueous ballpoint pen, which is discharged outside through the air outlet hole.