JP2001219685A - Ball pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an error correcting ball pen, which neither develops breakage of ink, nor dispenses with its agitation, nor raises trouble for pressing the side surface of a container. SOLUTION: In this ball pen, a plug 12 with a vent hole 12d is fixed to the rear end of an ink housing tube 8. At the same time, a sealing part 13 is provided on the outer peripheral part of the plug. An elastic member 15 is provided between the rear end of the inner hole of a tail plug 14 fixed to the rear end of the barrel and the rear end of the plug so as to energize a ball pen refill to ahead of the barrel in order to press air in the rear end hole of the ink housing tube through the sliding of the sealing part provided on the outer peripheral part of the plug under the state coming in close contact with the inner peripheral part of the tail plug by the retreating actuation of the ball pen refill so as to pressurize a follower 10, which is arranged at the rear end of an ink 9 so as to prevent the ink from evaporating and follow up to the ink together with the consumption of the ink, in order to be constituted to help the flowability to the tip side of the ink.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a ballpoint pen using an ink which easily runs out of ink during initial writing, and more particularly to an improvement of a ballpoint pen capable of correcting an erroneous writing or the like by concealing it with white ink.

[0002]

2. Description of the Related Art Conventionally, there has been known a liquid applicator using a white pigment in order to correct a mistake or the like. In addition, since a white pigment and a solvent are easily separated from each other, this type of liquid applicator has a flexible container in which ink, balls, and the like are sealed, and it is necessary to shake and agitate the liquid applicator before use. Further, the ink is ejected by pressing the side surface of the container. However, when the remaining amount of the ink becomes small, even if the side wall of the container is strongly pushed, the ink is not ejected. Further, the ink is easily solidified, and the tip of the application is sealed with a cap so as not to dry.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to mainly provide a ballpoint pen for correcting errors such as erroneous writing which does not require stirring and does not bother pressing the side of the container.

[0004]

The present invention has the following arrangement to achieve the above object. The ballpoint pen according to the first aspect of the present invention includes a tip of the ballpoint pen at the tip and an ink storage tube at the rear, and a spring pressure is applied to the back of the tip ball so that the tip ball comes into close contact with the inner edge of the ball holding portion at the tip of the tip. A ball-point pen refill provided with a ball-point pen is mounted in a barrel, and the tip of the tip is positioned so that the tip protrudes from the tip of the barrel. The body is fastened and a seal is provided on the outer periphery of the plug, and a spring is provided between the rear end of the inner hole of the tail plug fastened to the rear end of the barrel and the rear end of the plug. A ball-point pen refill is urged forward of the barrel, and a seal portion provided on the outer peripheral portion of the plug body is formed on the inner peripheral portion of the tail plug by a retraction operation of the ball-point pen refill by pressing on the tip end portion. Sliding in close contact with ink Air is pushed into the rear end hole of the vessel, and the rear end of the follower, which is arranged to prevent the evaporation of the ink at the rear end of the ink and follow the ink as the ink is consumed, is pressurized, and the tip of the ink is pressed. It is configured to support liquidity to the side.

A ballpoint pen according to a second aspect of the present invention is the ballpoint pen according to the first aspect, wherein the ink storage tube contains at least a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent, It is filled with a white pigment ink formulated to prevent sedimentation of the pigment and to minimize the loss of fluidity.

According to a second aspect of the present invention, there is provided a ballpoint pen according to the first aspect, wherein the rear end hole of the ink storage tube is communicated with the outside air immediately before the retraction operation of the chip, and the tip of the ballpoint pen is appropriately positioned. Immediately after retreating, the rear end hole of the ink storage tube is shut off from the outside air and pressurized.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, as shown in FIGS.
Is filled, and the rear end of the ink is filled with a grease-like follower 10 that follows the ink as the ink is consumed. In addition, the follower is not compatible with the ink and has a function of preventing the evaporation of the ink. In addition, a resin follower rod 11 having a specific gravity substantially equal to that of the follower is immersed in the follower as required. (Although it is shown in a pipe shape in FIG. 2, it may be of course a rod shape.) Further, the follower may be a follower such as silicon rubber.

The white pigment ink 9 contains at least a white pigment such as titanium oxide and hollow polymer fine particles and a gelling agent, and is formulated so as to prevent sedimentation of the pigment and to minimize the loss of fluidity. It is a white pigment ink. In addition, since the ink has a shear thinning property, the viscosity can be reduced by the rotation of the tip ball, so that a coating having a high concealing property can be performed.

Further, as shown in FIG.
A front shaft 3a is formed in front of b, and a rear shaft 3c is formed in the rear. The shaft 6a of the tip 6 holding the tip ball 6c is fixed to a hole at the front end of the front shaft 3a. Also, the front shaft 3a
A rib 3d is formed at a required location on the outer periphery.

The tip 6 is placed in a state where the tip ball 6c is substantially in contact with a seat having a channel into which ink can flow.
The tip ball 6c is swaged so as to be rotatably held. Further, the spring 7 is inserted into the inner hole of the chip 6, the rear end of the shaft 6a of the chip is appropriately caulked, and the rear end of the coil-shaped spring 7 cannot be pulled out.

A distal end having a very thin winding portion or a linear rod portion 7a is formed integrally with the spring 7 in front of the spring 7, or a pushing body having a distal end at the front end of the spring. Is provided, and the distal end portion thereof comes into contact with the back surface of the distal end ball 6c in a pressing manner. The tip ball 6c is brought into close contact with the inner edge of the ball holding portion 6b (formed by caulking or the like) of the chip 6 by the pressing. Further, it is also possible to form the chip into a resin molded product having excellent wear resistance and ink sealing performance, and to provide a spring seat for pressing the back surface of the tip ball as an integral or separate spring seat. is there. (Not shown)

By the way, it is extremely important that the tip ball 6c is in close contact with the inner surface of the ball holding portion, even if the ink has a high viscosity, for drying the writing tip and preventing direct current of the ink. That is, in order to increase the ink ejection amount, the ball-point pen for correcting and writing the erroneous writing as in the present application is set to have a larger retreat size of the tip ball than the ball-point pen for writing. In addition, grinding of the inner surface to improve the surface roughness of the inner surface of the chip holding the tip ball 6c and close contact accuracy by caulking, and secondary plastic working to increase the caulking accuracy are considered. Also, if necessary, a surface treatment or the like may be considered on the surface in close contact with the tip ball.

The joint 3 is provided with a valve chamber 4 which is appropriately eccentric with respect to the axis of the chip behind the chip 6, and the rear of the valve chamber 4 communicates with a guide hole 4c to have a tapered or spherical shape. A valve body receiving seat 4b is formed. A groove 4a through which ink can flow is formed on one side of the inner wall of the valve chamber 4.
Further, a spherical valve element 5 is loosely fitted in the valve chamber 4,
The valve body 5 abuts on a state where the valve body 5 is biased to the rear end of the shaft portion 6a of the chip in a state in which the ink is directed downward, so that the ink flowing from the guide hole 4c through the groove portion 4a or the like flows into the chip inner hole portion. Have been. Note that the valve body may be a shaft-like body having a tapered or spherical shape on the side close to the valve body receiving seat. In this case, the valve chamber does not need to be eccentric with respect to the chip axis as described above by forming a groove through which ink flows into the chip on the peripheral surface of the chip in contact with the rear end of the shaft portion of the chip. .

As described above, the rear shaft portion 3c extends behind the flange portion 3b of the joint 3. On the outer periphery of the rear shaft portion 3c, a cylindrical ink storage tube 8 is press-fitted and fixed by contacting the front end thereof to the rear end of the flange portion 3b, and the inner diameter portion of the ink storage tube 8 is conducted to the guide hole 4c of the joint 3. I have. The ink storage tube 8 is made of, for example, a transparent PP resin molded product. Further, in the ball-point pen of the above-described embodiment, the joint and the ink storage tube are formed as separate members, but both may be formed as an integral resin molded product.

A plug 12 is provided at the rear end of the ink container 8. The plug body 12 has a shaft portion 12a fixed to the rear end hole of the ink storage tube 8 at the front and an ink storage tube 8 at the rear.
And a shaft portion 12b having an outer periphery substantially equal to the outer periphery of the shaft, and a ventilation hole 12d is provided through the shaft center.
Further, a circumferential concave portion 12c is formed in the outer peripheral portion of the shaft portion 12b, and the seal member 13 is fitted in the concave portion 12c. The seal member 13 is made of, for example, an elastic material such as rubber or an elastic molding resin, and a material having good confidentiality and slipperiness is selected. In addition, other considerations such as interposition of a lubricant are taken into consideration. Further, the seal portion can be formed integrally with the outer peripheral portion of the shaft portion 12b. Further, it is also possible to integrally form the stopper at the rear end of the ink storage tube.

Further, the barrel 1 is a transparent resin molded product, which has a mouth portion 1a integrally with the front end thereof, an engagement portion of the cap 16 formed of a projection and a groove on the outer periphery, and an inner hole. A step 1b is formed. In addition, a step is formed at the rear end of the engaging portion so that the end of the cap 16 abuts. Also, a tail plug 14 is detachably screwed to the rear of the barrel 1, an engagement portion comprising a protrusion and a groove is provided on the outer periphery of the tail plug 14, and a cap is provided on the rear end of the barrel 1. There is formed a step portion with which the ends of the 16 abut.

Next, the structure of the ball-point pen will be described. The tip 6 is crimped to the joint 3 from the rear end of the barrel 1.
The ink container 8 is filled with the ink 9 and the follower 10, and the ball-point pen refill 2 with the stopper attached thereto is inserted into the rear end of the ink container, and the step 12 e at the rear end of the stopper 12 and the tail plug are inserted. A resilient member 15 is provided between the rear end of the bore 14 and the tail plug 14 is screwed to the rear end of the barrel 1.
4, the resilient member 15 is pressed and displaced by the forward movement of the tip 4 so that the outer periphery of the inclined rib 3d provided at a required portion of the front shaft portion 3a of the joint abuts on the step portion 1b of the lip portion to prevent the chip 6 from rattling. Is possible. In addition, a coil spring, sponge rubber, or the like can be used as the resilient member 15. Further, a contact step 14a is provided circumferentially substantially in front of the inner hole of the tail plug 14, and an inner peripheral part 14b is provided behind the contact step 14a.

The cap 16 fitted to the front of the barrel 1 is a transparent resin molded article having excellent elasticity. The clip 18 is positioned on the outer peripheral side of the cap 16 and the rear cylindrical part 18a is pressed against the rear end hole. are doing. Further, a ventilation hole penetrates through the rear end of the cylindrical portion 18a. Further, a cylindrical inner cap 16a having a small chamber is provided behind the inner hole of the cap 16, and the inner cap is integrally connected to the inner hole of the cap by a required number of ribs. As described above, an air passage communicating from the cap insertion port to the air hole is formed between the ribs, and is a safe ventilation means in the event that an infant swallows the cap. Also, the cap 16 has two engaging portions formed on the insertion-side inner hole at separate and independent positions. Also, the inner cap 16
A sealing plug 17 made of a non-liquid-absorbing, non-continuous-cell elastic body is fixed to the tip of the small chamber a.
The distal end is substantially tightly fitted in the small chamber, and the distal end ball 6c is pressed against the seal plug 17 as appropriate.

Incidentally, the ballpoint pen refill 1 shown in FIG.
9 shows another embodiment of the ballpoint pen refill. The difference from the above-mentioned ball-point pen refill 2 is that it does not have a valve element provided inside the joint and a follower rod provided inside the follower. That is, the valve element and the follower rod are not essential components. Details will be described later in operation.

[0020]

Next, the operation of the embodiment will be described below. First,
Fig. 3
The sealing member 13 provided on the plug 12 as shown in FIG.
4 is opposed to the contact step portion 14a provided at 4 with a slight gap. Next, the ballpoint pen refill 2 recedes due to the tip pressure being pressed more than the pen pressure,
When the seal member 13 is in close contact with the contact step portion 14a, the rear end hole of the ink storage tube 8 is shut off from the outside air, and further, the seal member 13 is moved backward while sliding on the inner peripheral portion 14b. Air is pushed into the rear end hole of the ink, and the rear end of the follower disposed at the rear end of the ink is pressurized, thereby supporting the flowability of the ink to the tip side. This has the effect of preventing the ink from separating from the peripheral surface of the tip ball due to drop impact and poor ink fluidity, etc. Become.

That is, the rear end hole of the ink container 8 is communicated with the outside air immediately before the tip of the tip is subjected to a load more than the writing pressure.
Immediately after the ink storage tube 8 is slightly retracted, the rear end hole of the ink storage tube is shut off from the outside air, and the rear end of the follower 10 is pressurized by further retreat. The means for allowing the rear end hole of the ink storage tube to communicate with the outside air is provided at the tip 1.
It is provided so as to communicate with the ventilation hole 12d at the rear of the shaft cylinder inner hole through the gap between the distal end hole of FIG. or,
It is also possible to form a ventilation groove at the joint between the barrel 1 and the tail plug 14 so that the ventilation groove communicates with the ventilation hole 12d.

Next, the operation of the ballpoint pen refill will be described. In a state where writing pressure is not applied to the tip of the chip, the tip ball 6c is brought into close contact with the inner edge of the ball holding portion of the chip by the pressing of the spring 7, so that the backflow of ink is prevented. Also, when the tip 6 is upward, the valve body 5 is in close contact with the valve body receiving seat 4b and seals the conducting hole 4c.
Even if the ink is written up and the ink on the back surface of the tip ball 6c of the chip runs out, the ink is caught by the head and does not flow backward. Therefore, when the tip 6 is turned downward, the ink can immediately flow out. By the way, in the structure having no valve element, when the upward writing is repeated, the ink acts in the backward flow direction, so that air is entrapped in the chip, and the ink tends to be hardly immediately discharged in the downward writing. The follower rod 11 is used when the ink storage tube has a large diameter. That is, the grease-like follower 10 has a problem that when the ink container tube has a large diameter, it is easily deformed and broken by the influence of impact or the like. The rigidity can be increased by immersing a resin follower rod having a specific gravity substantially equal to that of the follower in the follower.

The above-described ink backflow prevention structure having a follower rod and a valve element is effective when the ink storage tube has a large diameter and is easily backflowed, or when repeated upward writing or when an impact is applied. However, it is not essential as a component, and a ballpoint pen for correcting a typographical error is not necessarily used because it is rarely used upward.

[0024]

As described above, the present invention includes a ballpoint pen using ink that is easy to run out of ink in initial writing, a white pigment such as at least titanium oxide and polymer hollow fine particles, and a gelling agent. A ballpoint pen for erroneous correction that is easy to use and has no problem of separating the white pigment and the solvent using an ink that is blended so that the flowability is not impaired and the ink does not need to be stirred. However, it can be provided by applying a pressure equal to or higher than the writing pressure to the tip end portion with a simple structure.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a front half portion of a ballpoint pen according to an embodiment, showing a state in which a cap is fitted to a front end of a barrel.

FIG. 2 is an enlarged sectional view of a rear half of the ballpoint pen according to the embodiment.

FIG. 3 is an enlarged cross-sectional view of the rear half of the ball-point pen when the tip of the tip is pressed by more than the pen pressure and the ball-point refill is retracted.

FIG. 4 is a longitudinal sectional view of a ballpoint pen refill.

FIG. 5 is a longitudinal sectional view of a ballpoint pen refill according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 1a Mouth part 1b Step part 2 Ball pen refill 3 Joint 3a Front shaft part 3b Flange part 3c Rear shaft part 3d Rib 4 Valve room 4a Groove part 4b Valve seat seat 4c Guide hole 5 Valve body 6 Chip 6a Shaft part 6b Holder 6c Tip ball 7 Spring 7a Rod shaft 8 Ink storage tube 9 Ink 10 Follower 11 Follower rod 12 Plug body 12a Shaft 12b Shaft 12c Concave 12d Vent hole 12e Step 13 Seal member 14 Tail plug 14a Abutment step Part 14b Inner peripheral part 15 Resilient member 16 Cap 16a Inner cap 17 Seal plug 18 Clip 18a Tube part 19 Ballpoint pen refill

Claims (3)

[Claims] 1. A ballpoint pen refill having a tip of a ballpoint pen at the tip and an ink storage tube at the rear, and a spring pressure applied to the back of the tipball so that the tipball is in close contact with the inner edge of a ball holding portion at the tip of the tip. In a ball-point pen which is positioned so that the tip of the tip protrudes from the tip of the barrel, a plug having a vent hole is fixed to the rear end of the ink storage tube. A seal portion is provided on the outer periphery of the plug body,
Further, a resilient member is provided between the rear end of the inner hole of the tail plug fixed to the rear end of the barrel and the rear end of the plug, so that the ballpoint pen refill is urged forward of the barrel and the tip Due to the retraction of the ballpoint pen refill due to the pressing of the part, the seal part provided on the outer peripheral part of the stopper body slides in a state of being in close contact with the inner peripheral part of the tail plug, and air is pushed into the rear end hole of the ink storage tube. The rear end of the follower, which is arranged to prevent the evaporation of the ink at the rear end of the ink and to follow the ink as the ink is consumed, is pressurized so that the fluidity of the ink to the tip side is supported. A ballpoint pen characterized by being constituted. 2. The ink containing tube contains at least a white pigment such as titanium oxide and polymer hollow fine particles and a gelling agent,
2. The ball-point pen according to claim 1, wherein the ball-point pen is filled with a white pigment ink blended so that sedimentation of the pigment is prevented and fluidity is not impaired as much as possible. 3. Immediately before the retraction operation of the chip, the rear end hole of the ink storage tube is communicated with the outside air. Immediately after the chip is appropriately retracted, the rear end hole of the ink storage tube is shut off from the outside air and pressurized. The ballpoint pen according to claim 1, wherein the ballpoint pen is configured to perform the following.