JP2590439Y2 - Ballpoint pen refill - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention uses ink having a so-called shear thinning viscosity, which has a high viscosity in a static state, and the viscosity is reduced by rotation of a ball at the time of writing so that the ink flows out. Refills for ballpoint pens.

[0002]

2. Description of the Related Art Heretofore, there has been known a so-called water-based ballpoint pen in which ink is incorporated in a so-called oil-based ballpoint pen using high-viscosity ink and a fibrous batting, and the ink is guided to a ballpoint pen tip via an ink guide core. ing. Each of them has some drawbacks, but one of the shortcomings is that oil-based ballpoint pens have a disadvantage in that the ink has a high viscosity, and thus the ink has a low writing density and a low writing density. Further, the water-based ball-point pen has disadvantages in that the use of the batting containing the ink increases the cost of members and increases the cost, and that the consumption of the ink is unknown. In addition, under such circumstances, the ink has a high viscosity statically for the purpose of improving the respective disadvantages, and has a shear-thinning viscosity in which the viscosity is reduced by rotation of the tip ball during writing and the ink is discharged. Ballpoint pens that use a pen are also known. However, ballpoint pens that use ink with shear thinning have a tendency to evaporate the ink and have a large amount of ink flowing out (to increase the writing density) by increasing the diameter of the ink storage tube to increase the amount of ink loaded. Have many. Further, since the viscosity of the ink is smaller than that of the ink of the oil-based ball-point pen, the flow resistance to the ink storage tube is small. Accordingly, ink leakage (ink flows backward at the rear end of the ink storage tube) easily occurs due to the ink's own weight or impact. For this reason, usually, the rear end of the ink prevents evaporation of the ink and moves following the consumption of the ink at the time of writing, but it is a grease-like shape that suppresses the backflow of the ink against its own weight and impact. A follower is provided. However, even when the follower is provided, when the ink is written directly below the ball of the chip when writing upwards, when the ink head is directly applied, a remarkable backflow occurs because the ink head is directly added, and the inside of the barrel is contaminated and the ventilation hole provided in the barrel is provided. There is a danger of ink leaking from and soiling hands and clothes. The situation is not the ratio of the situation that occurs with oil-based ballpoint pens.

[0003]

The present invention uses an ink having a high viscosity in a static state, and a shear thinning ink in which the viscosity is reduced by the rotation of the tip ball during writing and the ink is discharged. It is a refill for refilling ballpoint pens, and it is possible to provide an inexpensive refill with good assemblability, and also to prevent the ink's own weight and impact, and also the backflow of ink even when writing upwards, to prevent the ink from flowing inside the writing barrel and hand, It is possible to prevent dirt on clothes.

[0004]

In order to achieve the above-mentioned object, the ball-point pen refill of the present invention has a tip fitted at the end of the joint, and a valve chamber at the rear communicating with the tip fitting hole. The valve body has a valve body receiving seat at the rear of the valve chamber, and the valve body is loosely fitted between the tip rear end and the valve body receiving seat. The shape is a regular polygonal shape, and an ink container is provided integrally behind the middle diameter portion.The ink container has a statically high viscosity, and the viscosity is increased by rotation of the tip ball during writing. The ink having the shear-thinning viscosity and the trailing end of the ink, which is lowered and the ink is discharged, is filled with a follower that follows with the consumption of the ink, and the rear end of the ink containing section is provided with a ventilation means for the outside air. The tail plug is fixed.

[0005]

1 to 3 show a first embodiment of the present invention. First, the refill 1 is configured with the tip 7, the tube 2, and the tail plug 15 as main members. The tube 2 has a joint 3a having a small diameter part 4a and a medium diameter part 5 at the front.
And a resin molded product having an excellent ability to suppress the evaporation of ink in a cylindrical body integrally provided with a large-diameter ink storage portion 3b extended long behind. The tip 7 holding the tip ball 7a is pressed into the tip fitting hole 6 at the tip of the small diameter portion 4a from the rear end side. The outer circumference of the middle diameter portion 5 has a regular polygonal cross-sectional shape, and when the refill 1 is mounted in the shaft cylinder of the writing instrument, the regular polygonal corner 5a is formed on the circumference of a base or the like. And the flat portion 5b forms a gap between the base and the inner periphery of the base, and the rear end of the refill inside the barrel from the base end hole. Is formed. (Not shown)

In the small diameter portion 4a of the joint 3a, a valve chamber 8 is provided at the rear in communication with the tip fitting hole 6. A ball receiving seat 9 (valve receiving seat) having a tapered or concave spherical shape is provided at a rear portion of the valve chamber 8, and a diameter of a virtual inscribed circle of a ball valve 12 (valve body) described later is provided at an inner surface of a front portion. An axial ridge 10 is provided at a plurality of positions on the circumference so as to be smaller than the diameter, and a ball valve 12 is elastically provided between the ball receiving seat 9 and the ridge 10 from the direction of the ridge. It is inserted while deforming and is loosely fitted in the valve chamber 8. A guide hole 11 communicating with the ball seat 9 is formed behind the valve chamber 8. Further, an inner hole of the ink container 3b communicates with the rear of the guide hole 11.

Further, the ink 13 has a high viscosity statically in the ink container 3b, and has a shear thinning viscosity in which the viscosity is reduced by the rotation of the tip ball 7a during writing and the ink can flow out. Further, the trailing end of the ink 13 is filled with a grease-like follower 14 that prevents evaporation of the ink and that can move following the ink surface while contacting the ink surface. The tube 2 is made of, for example, a transparent PP resin molded product, which suppresses evaporation of the ink and allows the ink to be consumed.

A tail plug 15 is provided at the rear end of the ink container 3b.
Is fixed. A vertical hole 16 and a horizontal hole 17 communicating with the vertical hole 16 are provided in front of the tail plug 15. The circumferential grooves 18 a and 18 b and the vertical groove 1 communicate with the horizontal hole 17 and communicate with the ventilation hole 20 at the rear end of the tail plug.
9a and 19b are appropriately formed. The reason for providing the air passage is to prevent the ink and the follower from reaching the air hole 20 when the ink and the follower flow backward in the unlikely event of an accident.
An object of the present invention is to prevent evaporation of ink and drying of a follower.

FIG. 4 shows a second embodiment of the present invention. The second embodiment has the same basic configuration as the first embodiment, and differs only in the configuration of the valve chamber. Hereinafter, only the differences will be described. A valve chamber 26 is provided at the rear in communication with the chip fitting hole 25 of the joint 23a. A conical ball receiving seat 27 is provided at the rear of the valve chamber 26. Valve room 2
Reference numeral 6 denotes a state in which the axis of the hole of the valve chamber 26 is appropriately eccentric with respect to the axis of the chip fitting hole 25 in a state where the ink fits in the inner periphery of the chip fitting hole 25, and ink flows into one side of the valve chamber hole. A groove 28 communicating with the ball valve 12 is provided in the valve chamber 26.
Is loosely fitted. The ball seat 2 is located behind the valve chamber 26.
7 are formed, and the guide hole 29 communicates with the inner hole of the ink containing portion 23b.

FIG. 5 shows a third embodiment of the present invention. The third embodiment also has the same basic configuration as the previous embodiment, and differs only in the configuration of the valve mechanism. Hereinafter, only the differences will be described. A valve chamber 35 is provided at the rear in communication with the chip fitting hole 34 of the joint 33a. A conical ball receiving seat 36 is provided at a rear portion of the valve chamber 35, and a groove 37 for inflow of ink is provided at a required portion on a peripheral wall in the valve chamber. A notch 30b is formed in the tip rear end 30a so that ink can flow into the chip 30 through the notch 30b when the ball valve 12 contacts the chip rear end 30a.

FIG. 6 shows a fourth embodiment of the present invention. The fourth embodiment has the same basic configuration as that of the first embodiment, except that the tube 40 is formed by fixing the ink container 42 to the press-fitting tube 43 of the joint 41. . In this embodiment, the ball valve 1 is provided in the valve chamber 44.
2 is loosely fitted, and the ball valve 12 cannot be pulled out by the ridge 45. However, the valve chamber is provided with a tapered portion at the rear to allow close contact with the valve body receiving seat and communicates with the front outer peripheral portion and the front end. Then, if a shaft-shaped valve element provided with a groove at a required location is loosely fitted, the ridge 45
It is also possible to make the ink flow into the chip through the groove even if the ink is brought into direct contact with the rear end of the chip without providing the chip.

[0012]

First, in the first embodiment, FIG. 1 shows a writing state in which the tip 7 is turned downward. At this time, the ball valve 12 comes into contact with the ridge 10 of the valve chamber 8 and
The ink 13 that has entered the valve chamber 8 from b through the guide hole 11 passes by the ball valve 12, passes between the ridges 10, and is guided to the tip ball 7 a. The ink statically shows a high viscosity, but the viscosity of the ink drops due to the rotation of the tip ball 7a, and a large amount of the ink flows out. FIG. 2 shows a state in which the tip 7 is directed upward. At this time, the ball valve 12 is located in the ball receiving seat 9 of the valve chamber 8 and seals the guide hole 11, so that the ball valve 12 is written upward and immediately below the tip ball. Even if the ink runs out, the ink does not clog the head and does not flow backward.

Next, FIG. 4 shows a state in which the tip 7 is directed upward in the second embodiment. At this time, the ball valve 12 is located on the ball receiving seat 27 of the valve chamber 26 to seal the guide hole 29. Therefore, even if the ink is written upward and the ink immediately below the tip ball runs out, the ink is caught by the head and does not flow backward. In a state where the chip 7 is directed downward, the ball valve 12 abuts on one of the chip rear ends 7b.
On the other hand, a gap through which ink can flow into the chip 7, that is, an ink inflow portion, is formed. Ink entering the valve chamber 26 from the inside of the ink storage portion 23 b via the guide hole 29 passes through the groove portion 28, And is guided into the chip 7.

FIG. 5 shows a state in which the tip 30 is directed upward in the third embodiment. At this time, the ball valve 12 is located in the ball receiving seat 36 of the valve chamber 35 and seals the guide hole 38. Ink does not flow backward even if it is written upward.
When the tip 30 is directed downward, the ball valve 12
Abuts against the chip rear end 30a, but the ink
b is guided into the chip 30. FIG.
This embodiment is basically the same as the first embodiment, and the description is omitted.

[0015]

The configuration and operation of the refill of the ballpoint pen according to the present invention are as described above. Since the valve chamber is provided in the middle of the joint that connects the chip and the ink storage portion, the refill can be easily assembled and is inexpensive. Can be provided. In addition, the valve body that fits loosely into the valve chamber seals the space between the ink storage section and the valve chamber by writing upwards, so that it is possible to prevent the ink from flowing backward and contaminating the inside of the writing barrel, the hands, clothes, etc. Becomes
In addition, by forming the middle diameter part of the joint in a regular polygonal shape, when the refill is attached to the barrel, play of the base and the chip is prevented, and air can be passed from the base hole of the base to the inside of the barrel. Since there is no pressure difference between the outside air and the inside of the barrel, accidents such as proper outflow of ink and ejection of ink are prevented. Further, according to the embodiment, the tail plug having the complicated flow passage communicating the inside and the outside of the ink storage portion is fixed to the rear end of the tube, so that the evaporation of the ink and the drying of the follower can be prevented. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the entire refill of a ballpoint pen according to a first embodiment of the present invention, showing a state in which a chip is directed downward.

FIG. 2 is a longitudinal sectional view showing the entire refill of the ballpoint pen according to the first embodiment of the present invention, showing a state in which the chip is directed upward;

FIG. 3 is a sectional view taken along the line AA in FIG. 1;

FIG. 4 is an enlarged sectional view of a main part showing a refill of a ballpoint pen according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a main part showing a refill of a ballpoint pen according to a third embodiment of the present invention.

FIG. 6 is a vertical sectional view showing the entire refill of a ballpoint pen according to a fourth embodiment of the present invention, showing a state in which a chip is directed downward.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refill 2 Tube 3a Joint 3b Ink accommodating part 4a Small diameter part 5 Medium diameter part 5a Corner part 5b Flat part 6 Chip fitting hole 7 Chip 7a Tip ball 7b Tip rear end part 8 Valve chamber 9 Ball seat 10 Ridge 11 Guide Hole 12 Ball valve 13 Ink 14 Follower 15 Tail plug 16 Vertical hole 17 Lateral hole 18a Peripheral groove 18b Peripheral groove 19a Vertical groove 19b Vertical groove 20 Vent hole 21 Refill 22 Tube 23a Joint 23b Ink storage portion 24 Small diameter portion 25 Tip fitting hole 26 Valve chamber 27 Ball receiving seat 28 Groove 29 Guide hole 30 Chip 30a Chip rear end 30b Notch 31 Refill 32 Tube 33a Joint 33b Ink storage portion 33c Small diameter portion 34 Chip fitting hole 35 Valve chamber 36 Ball receiving seat 37 Groove 38 Guide Hole 39 Refill 40 Tube 41 Joint Hand 42 ink storage portion 43 press-fit tube portion 44 valve chamber 45 ridges

Claims (1)

(57) [Scope of request for utility model registration] 1. A refill of a ball-point pen having a tip fitted to a tip, wherein the refill of the ball-point pen has a tip fitted to a tip of a joint, and a valve chamber provided at a rear side communicating with a tip fitting hole, Having a valve body receiving seat at the rear of the valve chamber, the valve body is loosely fitted between the tip rear end and the valve body receiving seat,
The cross section of the outer periphery of the middle diameter portion of the joint behind the valve chamber is formed into a regular polygonal shape, and further, an ink storage portion is integrally provided behind the middle diameter portion, and the ink storage portion is statically high. Having viscosity, the viscosity is reduced by the rotation of the tip ball at the time of writing, and the ink flows out, the ink having a so-called shear thinning viscosity and the trailing end of the ink are filled with a follower that follows with the consumption of the ink, A refill for a ballpoint pen, characterized in that a tail plug is fixed to the rear end of the ink storage section with ventilation means to the outside.