JP2607488Y2 - Ballpoint pen - 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. Regarding improvement of 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, for the purpose of improving each of the drawbacks, the ink having a high viscosity is statically reduced, and the viscosity is reduced by the rotation of the ball at the time of writing, so that the ink having the shear thinning viscosity is discharged. The ballpoint pen used is 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). 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) is likely to occur 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 if the follower is provided, when the ink is written immediately below the ball of the tip when the writing is performed upwards, a remarkable backflow occurs because the ink head is added directly, thereby contaminating the inside of the shaft cylinder and vent holes provided in the shaft cylinder. 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. Usually, the tip of the tip is tightly fitted to the tip of the tip, and a resin cap is fitted. However, since the cap has no ventilation means, the internal pressure of the cap increases when the cap is fitted, and a part of the air is removed. Flows into the ink through a small gap between the ball and the chip holding it. The air that has flowed in has no drawback due to the follower, and remains as bubbles in the ink, which has a drawback that smooth ink outflow during writing is hindered.

[0003]

The object of the present invention is to use an ink which has a high viscosity in a static state, and has a shear thinning viscosity in which the viscosity is reduced by rotation of a ball at the time of writing and the ink flows out. In the improvement of the ballpoint pen, the self-weight and impact of the ink and the backflow of the ink at the time of upward writing can be prevented to prevent the inside of the shaft cylinder, the hands, and the clothes from being stained. In addition, it suppresses a rise in internal pressure when the cap is attached, prevents bubbles from flowing into the ink, and smoothes out the ink during writing.

[0004]

The ballpoint pen of the present invention devised to achieve the above object has a crimping portion and a fitting cylinder portion integrally provided behind a mouth plug having a tip fitted at the tip thereof. A ballpoint pen in which an ink storage tube is fixed to a fitting tube portion and a mouth plug is fixed to a shaft tube by a crimping portion. The mouth plug has a horizontal groove and a vertical groove communicating therewith provided at a required portion of the crimping portion. Ventilation that communicates with a ventilation hole drilled at a required location behind the shaft cylinder through a gap formed between the inner hole of the cylinder and the ink storage tube.
Path is provided, or between the bore of the barrel and the ink containing tube.
The tail plug is fixed to the rear end of the barrel through the formed gap.
An air passage communicating with a hole communicating with the open air or a gap formed between the tail plug and the inner wall of the shaft cylinder is provided, and a valve chamber is provided behind the rear end of the tip with a mouth plug,
A ball receiving seat is provided at the rear of the valve chamber, and a required number of axial ridges are provided at the front inner surface. The ink has a high viscosity, the viscosity is reduced by the rotation of the ball at the time of writing, and the ink flows out, and the ink has a so-called shear-thinning viscosity, and a follower is provided at the rear end of the ink to follow the consumption of the ink. It is characterized by the following.

[0005]

1 and 2 show a first embodiment of the present invention. First, as shown in FIG. 1, the mouth puller 2 has a tapered shaft portion in the first half, and a crimping portion 5 having a horizontal groove 7 and a vertical groove 8 communicating therewith at a required portion of the outer periphery in the latter half thereof, and fitted to the rear thereof. It is an elastically deformable synthetic resin molded article integrally provided with the joint tube 6. The ink storage tube 3 is fixed to the fitting cylinder 6, and the tip 4 holding the ball at the tip is pressed into the tip fitting hole 13 at the tip of the tapered shaft from the rear end side. .

The mouth plug 2 is provided with a valve chamber 9 at the rear thereof in communication with the chip fitting hole 13. A ball receiving seat 10 having a conical or concave spherical shape is provided at the rear of the valve chamber 9, and a ball 12 having a diameter of an imaginary inscribed circle thereof is provided at an inner surface of the front portion.
Are provided at a plurality of positions on the circumference so as to be smaller than the diameter of the ball, and the ball 12 is placed between the ball receiving seat 10 and the ridge 11 from the direction of the ridge 11. Are elastically deformed and inserted into the valve chamber 9 to loosely fit. Further, a guide hole 14 communicating with the ball receiving seat 10 is formed behind the valve chamber 9.

As described above, the mouth plug 2 is inserted into the inner hole 15 from the front of the barrel 1, and the mouth plug 2 is fixed to the barrel 1 by the crimping portion 5. At this time, the vertical groove 8 communicates with the gap formed between the inner hole 15 and the ink storage tube 3 through the horizontal groove 7.
In addition, a ventilation hole 1 is provided on the rear side surface of the barrel 1 in communication with the inner hole 15.
6 are drilled. As a means for communicating with the inner hole 15, a small hole is formed in the tail plug 19 fixed to the rear end of the barrel 1, or a gap is formed between the tail plug 19 and the inner wall of the barrel 1 to the outside. It is also possible. In addition, the ink 17 has a statically high viscosity in the ink storage tube 4 and has a shear-thinning viscosity in which the viscosity is reduced by the rotation of the ball during writing so that the ink can flow out. Further, the rear end of the ink 17 is filled with a grease-like follower 18 which prevents evaporation of the ink and can move following the ink surface by contact with the ink surface as the ink is consumed. The ink storage tube 3
For example, a transparent PP resin molded product that suppresses evaporation of ink is used.

[0008]

FIG. 1 shows a writing state in which the tip 4 is directed downward. At this time, the ball 12 comes into contact with the ridge 11 of the valve chamber 9, and the ball 12 comes from the ink containing pipe 3 through the guide hole 14. The ink 17 that has entered passes beside the ball 12, and
1 and is guided to the tip of the chip 4. Although the ink 17 has a statically high viscosity, the viscosity decreases due to the rotation of the ball at the tip of the chip 4 and a large amount of the ink flows out. FIG. 2 shows a state in which the chip 4 is directed upward. At this time, the ball 12 is located in the ball receiving seat 10 of the valve chamber 9 and seals the guide hole 14, so that the ball 12 is written upward and directly below the ball of the chip. Even if the ink runs out, the ink does not clog the head and does not flow backward. Further, since the ventilation passage is formed from the lateral groove 7 of the mouth plug 2 to communicate with the ventilation hole 16 of the shaft cylinder 1, even if the cap is tightly fitted to the shaft tip, air is ventilated and the internal pressure of the cap does not increase. Bubbles do not flow into the ink.

[0009]

The configuration and operation of the ballpoint pen according to the present invention are as described above. A valve chamber is provided at an intermediate portion of the mouthpiece that connects the chip and the ink storage tube, and writing is performed upward by a ball that is loosely fitted into the valve chamber. Thus, since the space between the ink storage section and the valve chamber is sealed, it is possible to prevent an accident that the ink flows backward and stains the inside of the shaft cylinder, hands, clothes, and the like. In addition, since there is an air passage communicating from the lateral groove of the opening plastic to the air hole, even if the cap is tightly fitted to the shaft tip, the internal pressure of the cap does not increase, and therefore, no air bubbles flow into the ink, so that smooth ink can be used for writing. The outflow can be expected.

[Brief description of the drawings]

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

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

[Explanation of symbols]

 Reference Signs List 1 shaft cylinder 2 port plastic 3 ink storage tube 4 chip 5 crimping part 6 fitting cylinder part 7 lateral groove 8 vertical groove 9 valve chamber 10 ball receiving seat 11 ridge 12 ball 13 chip fitting hole 14 guide hole 15 inner hole 16 through Pores 17 Ink 18 Follower 19 Tail plug

Claims (1)

(57) [Scope of request for utility model registration] 1. A crimping portion 5 and a fitting tube 6 are integrally provided behind a mouth plug 2 having a tip 4 fitted to a tip thereof. Is a ball-point pen fixed to the barrel 1 at the crimping portion 5, and the mouth plug 2 is provided with a lateral groove 7 and a vertical groove 8 communicating therewith at a required portion of the crimping portion 5, and A ventilation path communicating with a ventilation hole 16 drilled at a required location behind the barrel via a gap formed between the barrel and the ink storage tube 3 is provided .
The gap formed between the inner hole 15 and the ink storage tube 3 is passed through.
The outside air provided on the tail plug 19 fixed to the rear end of the barrel 1
Ventilation path communicating is provided with holes or tail plug 19 and a gap leading to the outside air which is formed between the shaft tube 1 inner wall leading to, the valve chamber 9 is provided behind the tip 4 rear yet mouthpiece 2 The ball receiving seat 10 is provided at the rear of the valve chamber 9 and the required number of axial ridges 11 is provided at the front inner surface. Has a high viscosity statically, and the viscosity decreases when the ball is rotated during writing, causing the ink to flow out.The so-called shear-thinning ink and the trailing edge of the ink follow the ink as it depletes. A ball-point pen comprising a follower.