JPH0663376U - Ballpoint pen - Google Patents

Abstract

(57) [Abstract] [Purpose] A ball-point pen that uses ink with so-called shear thinning, which has statically high viscosity and whose viscosity decreases with the rotation of the ball during writing, causing the ink to flow out. Therefore, it prevents backflow in upward writing and eliminates looseness of the mouthpiece and tip to improve the writing feel. [Structure] Vertical ribs are provided at a plurality of locations on the outer surface of the press-fitting cylinder part having a tip fitted to the tip, and a fitting cylinder part is provided further behind the press-fitting cylinder part, and the ink containing tube is fixed thereto. In the state in which the front end of the shaft cylinder is abutted against the rear end edge of the press-fitting cylinder part of the joint, and the vertical rib formed on the press-fitting cylinder part is abutted against the inner step of the mouthpiece. The base is fixed to the shaft cylinder to prevent rattling of the base and the chip, and a valve chamber and ball receiving seat are provided at the rear that communicates with the chip fitting hole of the joint. Then, the ink containing pipe is provided with an ink having a shear thinning property and a follower which follows the consumption of the ink at the rear end of the ink so that the backflow of the ink can be prevented by upward writing.

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. Ballpoint pens that use ink are also known. However, a ball-point pen that uses ink with shear thinning viscosity has the property that the ink easily evaporates, and the amount of ink that flows out is large (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 ballpoint pen, the flow resistance to the ink containing tube is small. Therefore, ink leakage (ink flows back to the rear end of the ink containing tube) easily occurs due to changes in atmospheric pressure and temperature. Therefore, normally, the ink is prevented from evaporating to the trailing end of the ink, and it moves following the consumption of the ink during writing, but it suppresses the backflow of ink against changes in atmospheric pressure and temperature. A grease-like follower is provided. However, even if a follower is provided, when ink is written right below the ball of the tip when writing upwards, the ink head is added directly, causing a noticeable backflow, which contaminates the inside of the barrel and the ventilation holes provided in the barrel. There is a risk of ink leaking from them and soiling your hands and clothing. The situation is not a ratio of the situations that occur with oil-based balls. In addition, in a normal ballpoint pen, there is a backlash between the tip end of the mouthpiece and the tip, so that the tip swings during writing, resulting in a bad writing feeling.

[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 that statically exhibits a high viscosity, and the viscosity of the ball is lowered by the rotation of the ball during writing, causing the ink to flow out. Also, it prevents backflow of ink even when the atmospheric pressure or temperature changes or when writing upwards to prevent stains in the barrel, hands, and clothes. Further, even if there is a gap between the tip end of the die and the tip, the tip is prevented from rocking and the writing feeling is improved.

[0004]

[Means for Solving the Problems]

 The ball-point pen of the present invention devised to achieve the above object is provided with vertical ribs at a plurality of tapers on the outer surface of the press-fitting cylinder part into which the tip is fitted, and further has a rear end of the press-fitting cylinder part. A fitting cylinder is provided at the rear, and the joint with the ink containing tube fixed to the fitting cylinder is brought into abutment with the front end edge of the shaft cylinder with the rear end edge of the press-fitting cylinder part of the joint, and the vertical rib is attached. A ball-point pen in which a base is fixed to an axial cylinder in a state of abutting against an inner step of the base, and the valve pen is further provided with a valve chamber behind the tip-fitting hole of the press-fitting cylinder. , A ball receiving seat at the rear of the valve chamber, and a required number of axial ridges on the inner surface of the front, between which balls can be loosely fitted so that they cannot be pulled out statically Had high viscosity, and the viscosity decreased due to the rotation of the ball during writing, causing the ink to flow out, and had shear thinning viscosity. The rear end of the tank and the ink, characterized in that a follower to follow along with the consumption of ink.

[0005]

【Example】

 The embodiment of the present invention shown in FIGS. 1 and 2 has a press-fitting cylinder portion 7 in the first half and a fitting cylinder portion 11 in the latter half, and the outer surface of the press-fitting cylinder portion 7 on the front side is tapered at a plurality of vertical positions. A rib 8 is formed, and an ink storage tube 4 is fixed to the fitting cylinder portion 11 to provide a joint 3. Further, a chip 5 holding a ball at its tip is press-fitted into the tip fitting hole 10 at the tip of the press-fitting cylinder portion 7 from the rear end side.

The joint 3 is integrally formed of elastically deformable synthetic resin, and communicates with the tip fitting hole 10 and has a valve chamber 12 at the rear. A concave spherical ball receiving seat 13 is provided in the rear portion of the valve chamber 12, and an axial projection 15 is provided on the inner surface of the front portion so that the diameter of the virtual inscribed circle is smaller than the diameter of a ball 14 described later. Are provided at a plurality of positions on the circumference, and the balls 14 are inserted between the ball receiving seat 13 and the ridges 15 while elastically deforming the ridges 15 from the direction of the ridges 15 to allow play in the valve chamber 12. It is fitted. Further, a guide hole 17 communicating with the ball receiving seat 13 is formed behind the valve chamber 12.

A flange portion 16 is provided at the rear end of the press-fitting cylinder portion 7 of the joint 3, and a fitting cylinder portion 11 is extended behind the flange portion 16. A cylindrical ink storage tube 4 is press-fitted and fixed to the outer periphery of the fitting cylinder portion 11 by abutting the tip thereof to the rear end of the collar portion 16, and the inner diameter portion of the ink storage tube 4 is fitted into the guide hole 17 of the joint 3. It is in communication. The ink containing tube 4 is filled with the ink 19 having a shear thinning property that statically has a high viscosity and that the viscosity of the ball is reduced by the rotation of the ball during writing so that the ink can flow out. A rear end 19 of the grease 19 is filled with a grease-like follower 20 which prevents the evaporation of the ink and is movable in contact with the ink surface as the ink is consumed. The ink storage tube 4 is made of, for example, a transparent PP resin molded product that suppresses ink evaporation.

Next, the tip 5 of the shaft cylinder 1 is inserted into the joint 3 into the writing portion to which the tip 5 and the ink containing tube 4 filled with ink are fixed, and the front portion of the shaft portion 6 is provided with the collar portion 16 of the joint 3 after the collar portion 16. With the ends abutted against each other, the vertical rib 8 of the press-fitting cylinder portion 7 is abutted against the inner step portion 9 of the mouthpiece 2 in a biting manner, and the mouthpiece 2 is screwed onto the shaft portion 6 of the barrel 1. There is. Further, a ventilation hole 18 communicating with the inner hole portion of the shaft cylinder 1 is formed at an appropriate position of the shaft cylinder 1, and a tail plug 21 is press-fitted and fixed to the rear end of the shaft cylinder 1. In addition, the barrel 1 is made of a transparent resin molded product so that the amount of ink consumed can be known.

Further, the tail plug 21 is provided with a slit 22 at an appropriate position in the front, a press-fitting fitting portion 23 with the shaft cylinder 1, an approach 24 at the time of insertion, and a flat portion 25 at the front end, and a rear end. A collar portion 26 that comes into contact with the rear end surface of the barrel 1 is formed of an integral resin molded product.

[0010]

[Action]

 FIG. 1 shows a writing state in which the tip 5 is directed downward, and at that time, the ball 14 is brought into contact with the ridge 15 of the valve chamber 12 and enters the valve chamber 12 from the ink containing tube 4 through the guide hole 17. The ink 19 passes by the side of the ball 14, passes between the ridges 15, and is guided to the tip of the chip 5. The ink statically exhibits high viscosity, but the rotation of the ball at the tip of the tip 5 causes the viscosity to decrease, and a large amount of ink is flown out. Further, FIG. 2 shows a state in which the tip 5 is directed upward, and at that time, the ball 14 is positioned in the ball receiving seat 13 of the valve chamber 12 and closes the guide hole 17, so that the ball of the tip is written upward. Even if there is no ink right underneath, the head is not caught by the ink and does not flow back. Further, in the present invention, since the tip 5 is press-fitted into the tip fitting hole 10 of the press-fitting cylinder portion 7 of the joint 3, and the vertical rib 8 abuts the inner step portion 9 of the mouthpiece 2 in a biting manner. It is locked against the base 2.

[0011]

[Effect of device]

 The structure and operation of the ball-point pen of the present invention are as described above. A valve chamber is provided in an intermediate portion that communicates the tip and the ink containing tube, and the ball that is loosely fitted into the valve chamber allows the ink container and the valve chamber to be written upward. Since the space between them is sealed, it is possible to prevent an accident that the ink flows backward and stains the inside of the barrel, hands, clothes, etc. Also, with the vertical rib formed on the outer surface of the press-fitting cylinder part of the joint abutting against the inner step of the mouthpiece in a biting manner, the mouthpiece is fixed to the barrel and the joint is rattled by the mouthpiece. , The swing of the tip is suppressed and 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 a state in which a tip faces downward.

FIG. 2 is a vertical cross-sectional view of a main part of a ball-point pen that is an embodiment of the present invention, showing a state in which the tip faces upward.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Base 3 Joint 4 Ink storage pipe 5 Chip 6 Shaft part 7 Press-fitting cylinder part 8 Vertical rib 9 Inner step part 10 Tip fitting hole 11 Fitting cylinder part 12 Valve chamber 13 Ball receiving seat 14 Ball 15 Protrusion 16 Collar part 17 Guide hole 18 Vent hole 19 Ink 20 Follower 21 Tail plug 22 Slit 23 Press fit fitting part 24 Approach 25 Flat part 26 Collar part

Claims (1)

[Scope of utility model registration request] 1. A vertical rib is provided at a plurality of tapered locations on an outer surface of a press-fitting cylinder part having a tip fitted with a tip, and a fitting cylinder part is provided further rearward of a rear end edge of the press-fitting cylinder part. The front end of the shaft cylinder is made to abut against the joint where the ink containing tube is fixed to the fitting cylinder, and the rear end edge of the press-fitting cylinder of the joint, and the vertical ribs are bite-shaped against the inner step of the base. A ball-point pen having a cap fixed to a shaft cylinder in a fitted state, the ball-point pen further has a valve chamber communicating with the tip fitting hole of the press-fitting cylinder part, and a ball receiving part at the rear part of the valve chamber. The seat, again
The front inner surface has a required number of axial ridges between which a ball cannot be pulled out and is loosely fitted, and the ink containing tube has a statically high viscosity. A ball-point pen characterized by being provided with a so-called shear thinning ink whose viscosity is reduced by rotation and causing the ink to flow out, and a follower which is provided at the rear end of the ink to follow as the ink is consumed.