JP3490323B2 - Aqueous ballpoint pen - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for a braided writing implement which is sold in a unified external design of a plurality of different types of writing implements such as a ballpoint pen, a mechanical pencil and a marker. Water-based ballpoint pen. 2. Description of the Related Art As typical examples of writing instruments, ballpoint pens, mechanical pencils, markers and the like can be given. Sometimes stored and sold as a writing instrument. Such a braided writing instrument has an advantage that it can be produced efficiently because 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 instrument and the like, external components such as a barrel and a cap are shared, but the internal mechanism greatly differs depending on the type of the writing instrument. Since the functions required for the parts are different,
Even if the design of the external parts is made common, it may be difficult to completely make the internal structure completely common. 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 that has been compressed to a high pressure when the cap is attached 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 a stick-shaped plastic pen body is sealed. Therefore, an airtight portion is formed at the abutting 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 appearance is shared. Therefore, the water-based ballpoint pen and the marker cap could not be completely shared. Accordingly, it is an object of the present invention to provide a water-based ball-point pen which can completely use a marker and a cap and which is suitable for a writing instrument such as a braid. In order to achieve the above object, the present invention provides a ballpoint pen refill in which water-based ink is directly filled in an ink cylinder, which is mounted in a shaft cylinder, and a tip of the pen refill is used. When the cap projects from the tip opening of the barrel and the cap is attached to the barrel, a sealing member made of a soft elastic material disposed in the cap seals the tip of the tip. Form a close contact portion on the outer peripheral surface of the cylinder, and attach the cap to the shaft cylinder
When attached to both, both contact parts adhere tightly ,
An air inflow hole and an air outflow hole are formed before and after the contact portion of the barrel so that the compressed air in the cap when the cap is attached enters the barrel through the air inflow hole and is discharged to the outside through the air outflow hole. To 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 two. Chip 13
Is formed in a cannonball shape with stainless steel, and a ball 14 is rotatably held in a ball house at the tip with a part thereof 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 is pressed against the inward leading edge, 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
The writing can be performed by protruding from the leading end opening of the leading end portion 21 at the leading end. When not in use, the cap 40 is mounted on the tip of the barrel 20. In the cap 40, a spherical sealing member 50 made of a soft elastic material such as silicone 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.
On the inner peripheral surface on the side of the abutment 0, there is formed a contact portion 41 that tightly adheres to the contact portion 22 of the barrel 20. Cap 40
At the time of mounting, in the case of a marker, usually, as described below
The air inlet 23 and the air outlet 24 are not provided.
The contact portion 22 of the barrel 20 and the contact portion 41 of the cap 40
And the inside of the cap 40 becomes a sealed space. Accordingly
When the cap 40 is used as a cap for a marker, the sealed space prevents the ink from evaporating from the pen-shaped pen body of the marker. As shown in FIGS. 2 and 3, three air inflow holes 23 are formed in the front end portion 21 of the shaft cylinder 20 in front of the contact portion 22. Further, two air outlet holes 24 are formed in the shaft cylinder 20 behind the close contact portion 22 as shown in FIGS. 2 and 5. That is, the shaft cylinder 20
An air inflow hole 23 and an air outflow hole 24 are formed before and after the contact portion 22. As shown in FIGS. 2 and 4, three vertical ribs 25 are formed in the barrel 20 behind the front end 21, and the ballpoint pen refill 1 mounted in the barrel 20 is formed.
0 is positioned when the step of the joint 12 abuts against the rear end edge of the vertical rib 25 and receives the resilience of the spring 31. However, even if the ballpoint pen refill 10 is mounted in the barrel 20, 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 distal end of the barrel 20, in the process, the contact portion 22 of the barrel 20 is attached.
The end of the tip 13 is brought into contact with the end of the contact portion 41 of the cap 40, but when the cap 40 is completely pushed in to complete the mounting, the tip of the chip 13 is sealed with the seal member 50. In this cap mounting process, but the inside air is pressurized the volume of the closed space in the cap 40 is reduced, the air inflow hole 23 and the air outlet hole 24 in the front and rear of the adhesion portion 22 of the barrel 20 is formed Therefore, 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 air flows from the tip of the tip 13 before being sealed by the seal member 50.
Never get inside. As described above, the close contact portion 22 of the barrel 20 and the close contact portion 41 formed at the abutment portion of the cap 40 are air-tightly adhered to each other to make the inside of the cap 40 a sealed space. Even if evaporation is prevented, the air inflow hole 23 and the air outflow hole 24 are formed before and after the contact portion 22 of the barrel 20, so that it can be used as a cap for an aqueous ballpoint pen. As described above, according to the present invention, a ball-point 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 is moved from the tip opening of the cylinder. Projecting, when the cap is mounted on 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,
Close contact between the inner peripheral surface of the abutment of the cap and the outer peripheral surface of the barrel
Each is formed, and when the cap is attached to the barrel,
With wear portion comes into close contact with the hermetically, before and after the contact portion of the barrel to form an air inflow hole and the air outlet hole, air in the cap is compressed during cap installation enters the axial cylinder from the air inflow hole, the air Since it was released to the outside from the outflow hole,
The marker and the cap can be completely standardized, and an aqueous 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 sectional view of a main part of the barrel. FIG. 3 is a sectional view taken along line AA of FIG. 2; 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] 10 Ballpoint pen refill 11 Ink cylinder 12 Fitting 13 chips 14 ball 15 Anti-reflux agent 16 pieces 20 shaft barrel 21 front entrance 22 Close contact part of shaft cylinder 23 Air inlet 24 air outlet 25 vertical ribs 30 caps 31 Spring 40 cap 41 Close contact of cap 50 Sealing member L water-based ink

Claims (1)

(57) [Claims 1] A ballpoint pen refill filled with water-based ink directly in an ink cylinder is mounted in a shaft cylinder, and a tip of the ballpoint pen refill projects from a tip end opening of the shaft cylinder, and a cap is closed. When fitted to the barrel, in an aqueous ball point pen in which the sealing member seals the tip point consisting of soft elastic bodies arranged in the cap, close contact with the outer peripheral surface of the inner peripheral surface and the barrel of the abutment portion of the cap
When each part is formed and the cap is attached to the barrel
The contact portions are airtightly attached to each other , and an air inflow hole and an air outflow hole are formed before and after the close contact portion of the barrel, so that the air in the cap compressed at the time of mounting the cap flows from the air inflow hole to the barrel. An aqueous ball-point pen, which enters inside and is discharged outside through the air outlet hole.