JPH0671168U - Ballpoint pen - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To prevent air bubbles from flowing into the ink, and to prevent ink evaporation and rattling of the tip and base during writing. Also, do not suffocate if accidentally swallowed. [Structure] An inner cap 3 is provided on the cap 1, and a chip is brought into close contact with the inner cap 3 to prevent the tip ball 21 from drying and ink from evaporating. Further, the tip end hole of the base 15 and the inner hole 10 of the shaft cylinder 9 are made to communicate with each other, and the pressurization and depressurization states are relieved by the insertion and removal of the cap to prevent the inflow of air bubbles into the ink.
Vent hole 5 even if a child accidentally swallows the cap
This enables air circulation. Further, attach the vertical rib 12 to the base 1.
5 is made to hit the inner step part 16 of 5, and the chip | tip is rattled with respect to the base 15.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a ball-point pen that uses ink having a so-called shear thinning property, which has a statically high viscosity, and the viscosity is reduced by the rotation of the ball during writing to cause the ink to flow out.

[0002]

[Prior art]

 Conventionally known are so-called oil-based ballpoint pens that use high-viscosity ink and so-called water-based ballpoint pens that incorporate ink into fibrous batting and guide the ink to the ballpoint pen tip through the ink guide core. Each of them has some drawbacks, but one of the shortcomings is that the oil-based ball-point pens have a low ink drop and writing density due to the high viscosity of the ink. In addition, since the water-based ballpoint pen uses batting that contains ink, there are disadvantages that the material cost is high and the ink consumption is unknown. In addition, under such circumstances, it had a high viscosity statically for the purpose of improving each defect, and had a shear thinning property that the viscosity was lowered by the rotation of the ball during writing and the ink was leaked. A ballpoint pen using ink is known. However, a ball-point pen that uses ink with shear thinning viscosity has the property that ink easily evaporates and the writing tip easily dries, and the amount of ink that flows out is large (to increase the writing density). The diameter is thickened to increase the amount of ink loaded. Moreover, since the viscosity of the ink is smaller than that of the ink of the oil-based ballpoint pen, the flow resistance to the ink containing tube is small. Therefore, there is a problem that ink leakage (ink flows back to the rear end of the ink containing tube) easily occurs due to its own weight and impact, and the tip ball easily pops out due to a drop impact. Therefore, it usually prevents the evaporation of the ink at the trailing edge of the ink and moves following the consumption of the ink during writing, but it is a grease-like material that suppresses the backflow of the ink against its own weight and impact. A follower is provided. Further, when not in use, the tip ball is pressed against a non-liquid absorbing and non-continuous bubble-sealing seal plug provided in the cap. In addition, the tip of the chip is usually tightly fitted to the tip of the shaft and a resin cap is fitted. However, if there is no ventilation means in the cap, the internal pressure of the cap increases when the cap is fitted and a part of air is It flows into the ink through a slight gap between the ball and the chip that holds it. The air that has flowed in remains as bubbles in the ink because there is no escape area due to the followers, and there is a drawback that the smooth outflow of ink during writing is obstructed. Therefore, a ventilation means is provided between the tip of the writing brush and the cap to prevent it, but it has a negative effect on the evaporation of the ink.

[0003]

[Problems to be solved by the device]

 An object of the present invention is to improve a ball-point pen that uses ink having a shear thinning property in which statically high viscosity is exhibited, and the viscosity is lowered by the rotation of the ball during writing, causing the ink to flow out. , It is possible to prevent the inflow of air bubbles into the ink by suppressing the increase of the internal pressure when the cap is attached, and to prevent the evaporation of the ink by a simple means, and to prevent the backlash to the base during writing. Also, even if an infant accidentally swallows the cap and gets stuck in his throat, air communication is possible and suffocation and other dangers can be avoided.

[0004]

[Means for Solving the Problems]

 The ballpoint pen of the present invention devised to achieve the above-mentioned object is a press-fitting cylinder part having a tip fitted with a tip and a press-fitting part of a joint and a joint in which an ink containing tube is fixed behind a rear end edge of the press-fitting cylinder part. A ball-point pen in which the front end of the barrel is abutted against the rear end of the barrel, and the base of the press-fit barrel is abutted against the barrel in a biting manner. The ball-point pen is provided with an air passage that communicates with the inner hole of the barrel through the gap between the tip hole of the die protruding the tip and the groove, and through the gap between the inner periphery of the die and the outer periphery of the joint. It is a cap that is fitted and fixed, and an inner cap that tightly fits the brush tip in a small chamber is formed integrally with the cap, and a ventilation hole is provided between the cap and the inner cap from the insertion side of the cap to the rear end. And the tip of the tip inside the inner cap. Characterized by being arranged a seal plug body having an elastic non-open cell in a non-absorbent in a state of being pressed.

[0005]

【Example】

 1 and 3 show an embodiment of the present invention. First, as shown in FIG. 2, the joint 11 has a press-fitting cylinder part 11a in the first half and a fitting cylinder part (not shown) in the latter half, and is vertically tapered at a plurality of locations on the outer surface of the press-fitting cylinder part 11a on the front side. The rib 12 is formed, and the ink containing tube 18 is fixedly provided in the fitting cylinder portion. Further, a chip 20 holding a tip ball 21 is press-fitted from the rear end side into a chip fitting hole (not shown) at the tip of the press-fitting cylinder part.

Further, the joint 11 is integrally formed of an elastically deformable synthetic resin, and a valve chamber (not shown) is provided at the rear in communication with the tip fitting hole. A concave spherical ball seat is provided at the rear of the valve chamber, and an axial ridge is circumferentially provided on the inner surface of the front so that the diameter of the virtual inscribed circle is smaller than the diameter of the ball described later. The ball is inserted in the valve chamber between the ball receiving seat and the ridge while elastically deforming the ridge from the direction of the ridge, and is loosely fitted in the valve chamber. A guide hole (not shown) communicating with the ball receiving seat is formed behind the valve chamber (not shown).

A flange portion 13 is provided at the rear end of the press-fitting cylinder portion 11 a of the joint 11, and a fitting cylinder portion is extended behind the flange portion 13. Further, notches 14 are provided on the rear surface of the collar portion 13 at appropriate places. Further, a cylindrical ink containing tube 18 is press-fitted and fixed to the outer periphery of the fitting tubular part by abutting the tip thereof to the rear end of the collar part 13, and the inner diameter part of the ink containing tube 18 is fitted into the guide hole of the joint 11. It is in communication. The ink containing tube 18 is statically highly viscous, and is filled with ink having a shear thinning property that reduces the viscosity by the rotation of the ball during writing and allows the ink to flow out. In addition to preventing ink evaporation, the rear end is filled with a grease-like follower that can move while contacting the ink surface as the ink is consumed. (Not shown) For the ink storage tube 18, for example, a transparent PP resin molded product or the like that suppresses the evaporation of ink is used.

Next, from the tip of the barrel 9 to the joint 11, the tip 20 and the writing portion to which the ink storage tube 18 filled with the ink is fixed is inserted, and the collar portion 13 of the joint 11 is attached to the front surface of the shaft portion 9a. The base 15 is screwed onto the shaft 9a of the barrel 9 with the rear end edge abutted and the vertical rib 12 of the press-fitting cylinder 11a abutting against the inner step portion 16 of the base 15 in a biting manner. I'm wearing it. A tail plug 19 is press-fitted and fixed to the rear end of the barrel 9. (See FIG. 1) Further, the shaft cylinder 9 is made of a transparent resin molded product so that the ink consumption amount can be understood. With the above structure, the tip 20 is communicated with the inner hole 10 of the barrel 9 through the gap 22 of the tip hole protruding from the tip, the inner periphery of the base 15, the gap between the vertical ribs 12 of the joint 11 and the notch 14. A gap 23 is formed. If necessary, a hole for communicating the inner hole 10 with the outside air is provided on the side surface of the barrel 9 or the tail plug or between the tail plug and the barrel.

By the way, the cap 1 fitted on the tip of the shaft is provided with a clip 2 on the outer peripheral side surface thereof, and a cylindrical inner cap 3 having a small chamber 6 behind the inner hole is provided. The cap 3 is integrally formed with a required number of ribs 4 between the cap 3 and the inner hole. In addition, a ventilation hole 5 is formed between the rib and communicates from the cap insertion port to the rear end. There are various means for forming the vent holes, and the structure is not particularly limited. Further, the cap 1 is provided with an engaging portion 7 at its insertion port and is detachably fixed to an engaging portion 17 provided on the shaft tube 9. The engaging portion is formed by engaging a convex portion or a concave portion that is normally used. Further, a seal plug 8 made of a non-liquid absorbing and non-continuous bubble elastic body is fixed to the tip of the small chamber 6 of the inner cap 3, and the tip of the tip 20 and the base 15 are tightly fitted in the small chamber 6. The tip ball 21 is appropriately pressed against the seal plug 8.

[0010]

[Action]

 With the tip 20 facing upward, the ball is in a state of circumferentially contacting the ball receiving seat of the valve chamber and seals the guide hole, so that it is possible to prevent the ink from flowing backward in the upward writing. 1 and 2 show a state in which the cap 1 is fixedly attached to the tip of the shaft, and since the tip of the tip 20 is in pressure contact with the seal plug body 8, there is no problem of the tip ball 21 popping out by a drop impact. Further, since the inner cap 3 is closely fitted, the tip ball 21 is prevented from drying and ink is prevented from evaporating. Further, since the tip end hole of the mouthpiece 15 is communicated with the inner hole 10 of the shaft cylinder 9, pressurizing and depressurizing states are relieved by inserting / removing the cap, so that the problem of bubbles flowing into the ink is also prevented. In addition, the vent hole 5 allows air to flow even if an infant accidentally swallows the cap. Further, since the vertical ribs 12 abut against the inner step portion 16 of the mouthpiece 15 in a biting manner, the chip 20 is locked against the mouthpiece 15.

[0011]

[Effect of device]

 The structure and operation of the ball-point pen of the present invention are as described above, and the pressurization and depressurization at the time of mounting the cap are suppressed to prevent the inflow of air bubbles into the ink, thereby enabling smooth writing performance. In addition, the evaporation of ink and the drying of the writing tip can be prevented by simple means. Moreover, even if an infant accidentally swallows the cap and gets stuck in his throat, the risk of choking can be avoided. Furthermore, since there is no play between the tip and the mouthpiece when writing, the writing feel is good.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a ball-point pen that is an embodiment of the present invention, showing the entire writing instrument in which a cap is attached with its tip facing upward.

FIG. 2 is an enlarged view of a main part of a ball-point pen which is an embodiment of the present invention, showing a cross section of a portion where a cap is attached with the tip facing upward.

FIG. 3 is an enlarged view showing an upper end portion of the cap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap 2 Clip 3 Inner cap 4 Rib 5 Vent hole 6 Small chamber 7 Engagement part 8 Seal plug body 9 Shaft cylinder 9a Shaft part 10 Inner hole 11 Joint 11a Press-fitting cylinder part 12 Vertical rib 13 Collar part 14 Notch 15 Inner step Part 17 Engagement part 18 Ink storage tube 19 Tail plug

Claims (1)

[Scope of utility model registration request] 1. A press-fitting cylinder part having a tip fitted with a tip, a joint to which an ink containing tube is fixed behind a rear end edge of the press-fitting cylinder part, and a front end of a shaft cylinder at a rear end edge of the press-fitting cylinder part of the joint. A ball-point pen in which a cap is fixed to a shaft cylinder in a state where the edges are abutted and the outer side of the press-fitting cylinder part is abutted against each other, and the ball-point pen has a tip protruding from the base. A cap that is provided with a gap between the tip hole and a groove that communicates with the inner hole of the shaft through the gap between the inner circumference of the base and the outer circumference of the joint, and is fitted and fixed to the tip of the shaft. The inner cap that tightly fits the part in the small chamber is formed integrally with the cap, and a ventilation hole is provided between the cap and the inner cap from the insertion side of the cap to the rear end. Of non-absorbent and non-continuous bubbles under pressure A ball-point pen having an elastic seal stopper.