JPH10264589A - Dual knock type ballpoint pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly project or retract a writing tip by providing an ink reservoir tube of a substantially non-deforming shape with a long front barrel between a front end of the tube and the writing tip, and projecting the writing tip from a tip port of a barrel at the time of locking a locking protrusion to a locking step of a clip. SOLUTION: A locking protrusion 13a of a ballpoint pen writing element 1a is locked to a locking step 25 of a ball 24 of a clip, and a writing tip of the element 1a is projected from a tip port 29 of a barrel 20. Then, when the other ball point pen knocks a rear end of a pen writing element 1b, a locking protrusion 13b suitably lifts a rear end 26 of the ball to release locking of the protrusion 13a to the step 25, and the element 1a is retracted. Further, when the element 1b is moved forward, the protrusion 13b is locked to the step 25, and a writing tip of the element 1b is projected from the port of the barrel 20. That is, in the case of projecting or retracting the element, an ink reservoir is non-deformed, but a front barrel 3 is bent to be smoothly operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an ink storage section for directly storing ink without storing it in an ink storage body or the like. When the air in the ink storage section expands due to a temperature rise or the like, the ink is pushed out of the ink storage section. Two types of ballpoint pen writing materials with an ink reservoir that temporarily stores ink to prevent it from dropping from the tip ball or ventilation groove are mounted, and each writing tip alternates from the tip mouth of the barrel. The present invention relates to a double knock-type ballpoint pen which can appear and disappear in a golf ball.

[0002]

2. Description of the Related Art In general, there has been known a double-type writing instrument having a plurality of writing objects such as a ball-point pen mounted thereon so that a writing tip can be selectively protruded and retracted from an axis. In addition, as a retracting mechanism of the writing tip portion of the double-type writing instrument, a knocking type, a slider type that alternately slides a slider protruding from the side of the shaft cylinder of the writing instrument, and a cam cylinder having an inclined surface are rotated. Various types such as a cam type are known. The conventional retracting mechanism has a built-in return spring for returning the writing body to the inside of the barrel, so the structure is complicated and the number of parts is large,
There is a problem of high cost.

A ball-point pen writing material filled with a low-viscosity ink has a thick ink storage tube, and when mounted on a double-type writing instrument having a normal thickness, the tip of the writing material protrudes without any degree of freedom between the writing materials. The part is not smoothly centered on the tip hole of the barrel, and the operation is hindered, so that the writing tip cannot appear or disappear. Therefore, there is a disadvantage that the shaft cylinder becomes extremely thick to enable the operation, and the portability and the usability are deteriorated. or,
If the tip of the cursive script is inserted into a pocket or the like while protruding, there is a risk that ink will be sucked out and the clothes will be soiled.

[0004] Low-viscosity inks such as water-based ballpoint pens have low viscosity of several mPa · S or less, and therefore have the advantage that they can be written with light writing pressure and have good writing quality. However, there is a drawback that a DC phenomenon in which the ink flows slowly from the pen tip, and a reverse flow phenomenon in which the air flows in from the tip of the ballpoint pen and the ink flows out, are likely to occur. A method of preventing these phenomena by using a fiber convergence body (ink occluding body) called batting has been adopted.
Further, there is known an ink storage device provided with an ink storage body for temporarily storing ink.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a double knock which mounts two kinds of ballpoint pen writing bodies using low-viscosity ink and allows each writing tip to protrude and retract from a shaft tip opening. In the ball-point pen, even if the ink storage portion of the writing pen is large and non-deformed, the diameter of the writing instrument shaft does not become extremely large, and the tip of the writing pen can smoothly appear and disappear. In addition, the structure must be simple and can be provided at low cost. Further, a safety mechanism is provided in which the writing tip automatically enters the shaft cylinder even if the writing tip is inserted into a breast pocket or the like with the writing tip protruding.

[0006]

The present invention has the following arrangement to achieve the above object. A double-knock ballpoint pen according to the first aspect of the present invention is provided with a tip for holding a tip ball, a joint and an ink reservoir integrally provided in series behind the tip, and the ink storage tube is relatively provided. A ballpoint pen writing device which has a large cross-sectional area and is substantially non-deformable at the rear end and filled with a low-viscosity ink in an ink storage tube and an ink reservoir fitted into a front inner hole of the ink storage tube. In a double knock-type ballpoint pen having two types of pen and a ballpoint pen writing body mounted thereon, a clip having a locking step formed at a ball portion at the tip is provided at the rear of the barrel, and the clip faces each other. A slit is formed in the side surface of the shaft to be engaged, and a locking projection is provided on the side surface of the shaft of each ink storage tube or the side surface of the knocking portion disposed in conjunction with the ink storage tube. Part penetrates into the slit, On the other hand, a step is provided behind the tip end of the barrel, and the ink storage tube is substantially non-deformed, and a long front shaft is provided between the front end of the ink storage tube and the writing tip. A return spring is inserted into the outer peripheral portion of the portion, and a return spring is provided between the step portion and the front end of the ink storage tube to urge each ball-point pen writing body backward, and the ball-point writing body is moved forward. Thus, when the locking projection is locked to the locking step of the clip, the writing tip projects from the tip end of the barrel.

According to a second aspect of the present invention, there is provided a double knock-type ballpoint pen, wherein the step portion is integrally provided on a rear peripheral wall of a tip end opening of the barrel. A linear locking portion is formed in front of the return spring, and its tip is locked to the step of the shaft cylinder.

[0008]

1 to 6 show a first embodiment of the present invention. In FIG. 1, two ballpoint pen writing bodies 1a and 1b are provided. The double knock type ballpoint pen intended by the present invention is equipped with a ballpoint pen writing material filled with a low-viscosity aqueous or low-viscosity oil-based ink.

First, a ballpoint pen writing body mounted on a double knock ballpoint pen according to the present invention will be described. still,
The ballpoint pen writing bodies 1a and 1b have the same configuration, for example, different in ink color and drawing line width.

As shown in FIG. 5, the tip 8 is caulked so that the tip ball 9 is rotatably held with the tip ball 9 substantially in contact with a seat having a channel into which ink can flow. .

The joint 2 has a flange 5 behind the front shaft 3.
And an ink reservoir 4 having a plurality of retaining grooves 4a further on the rear side as an integral resin molded product. Further, the shaft 8a of the tip 8 is press-fitted to the inner hole 3a at the tip of the front shaft 3, and the ink reservoir 4 is firmly fixed to the front end hole of the ink storage tube 10. Incidentally, the joint 2 and the ink reservoir 4 may be constituted by separate members.

In addition, a ventilation groove 4b is provided at a required portion of the flange portion 5 which abuts on the front end of the ink storage tube 10, and the outside air and the air inside the ink storage body 4 and the ink storage tube 10 are exchanged. The air passage for air replacement has an effect on the loss of volatilization of the ink, and although it is simply shown in the figure, a narrow bypass air passage is desirable.

A low-viscosity ink 11 is filled in the ink storage tube 10 behind the ink reservoir 4. or,
A closing portion 10a is formed at a substantially rear end of the ink storage tube 10. In addition, a transparent polypropylene resin molded product or the like is used as the ink storage tube 10 as an example. In addition, the ink storage tube 10 is selected from a material having an excellent clear drain property. The ink container 10 has a relatively large diameter and is substantially non-deformed.
In this embodiment, as shown in FIG. 6, the cross-sectional shape of the ink storage tube is substantially semicircular. Therefore, there is an advantage that when the same type of two types of ballpoint pen writing materials are combined, the shape becomes a circle that can be substantially densely mounted on the barrel 20, so that the barrel does not become thicker than the large-diameter ink storage tube.

A locking projection 13a is formed on the rear outer periphery of the ink container 10 so as to be integral with the axial direction. The locking piece 14a protrudes and a locking portion 15a is formed at the rear end. In the embodiment, the locking projection 13a and the locking piece 14a are used.
Is provided integrally with the ink container 10, but it is also possible to fasten the ink container as a separate member. Alternatively, a knocking member may be provided at the rear of the ink storage tube, and a locking projection and a locking piece may be provided on the side surface of the shaft. Thus, the ballpoint pen writing body 1a is configured. The ballpoint pen writing body 1b is similarly configured.

Next, a clip 2 is attached to the rear shaft side surface of the shaft cylinder 20.
3 is formed, and a slit 21 is formed in the shaft side surface facing the clip 23 from the rear end toward the front. Another slit 28 is formed on the shaft side surface of the shaft cylinder 20 opposite to the slit 21. A ball portion 24 is formed at the tip of the clip 23, and a hook-shaped locking step 25 and a side wall 27 are provided in front of the ball portion 24. The rear end 26 of the ball 24 has an inclined surface as appropriate. The clip 23 is composed of the ballpoint pen writing materials 1a and 1b.
The locking projections 13a, 13b are elastically displaceable in the lateral direction by a distance that can disengage the locking step 25. Further, a step portion 22 is provided on a peripheral wall behind the distal end opening 29 of the shaft cylinder 20.

As described above, the return springs 29a and 29b are fitted around the outer peripheral portion of the front shaft portion 3 of each of the ballpoint pen writing bodies, and the rear ends thereof are abuttedly engaged with the front ends of the flanges 5 at the rear end of the joint. The ball-point pen writing body 1a is
1b is inserted and a locking projection 1 formed in the slit 21 on the outer peripheral portion of the rear side of the ballpoint pen writing body 1a, 1b.
3a and 13b are inserted. The locking pieces 14a, 14b are fitted into the slit 28, and the locking portions 15a, 15b are brought into contact with the rear end of the slit 28. Note that a linear locking portion 30 is provided in front of the return springs 29a and 29b.
a and 30b are formed, and the tips are locked to the step 22 of the barrel 20. The ballpoint pen writing bodies 1a and 1b are provided between the front end of the flange 5 at the rear end of the joint and the step 22. The return springs 29a and 29b are always urged rearward.

Further, the return spring 2 is
The inner circumference of the rear end portion of the return spring is set to the outer circumference of the front shaft so as to prevent rotation of 9a and 29b, or a locking portion or the like is provided on the outer circumference of the front shaft. The inner diameter of the coil spring is provided slightly larger than the outer circumference of the front shaft portion so that the coil spring does not deform and the expansion and contraction is smooth. In addition, when the ballpoint pen writing material appears and disappears, as described above, the ink storage portion 10 is not deformed, but the front shaft portion 3 is bent and can be operated smoothly.

It is to be noted that a partition member is provided at an appropriate rear side of the distal end port 29 of the barrel 20 and the writing member 1 is provided on the partition member.
It is also possible to provide two holes through which the front shaft portions 3a and 1b pass, and to provide the front end of the winding portion in contact with the partition member without providing a linear locking portion in front of the return spring. is there.

FIGS. 7 and 8 show a second embodiment of the present invention. Hereinafter, differences from the first embodiment will be described. The ink storage tubes of the ballpoint pen writing bodies 40a and 40b mounted in this embodiment have a circular cross-sectional shape. The cross-sectional shape of the shaft cylinder 41 is substantially rectangular.

[0020]

The operation of the first embodiment will be described. First, FIG.
4 shows a state in which the writing tips of the ballpoint pen writing bodies 1a and 1b are housed in the barrel 20. FIGS. 1 and 2 show a state in which one rear end is knocked from this state. As shown in the drawing, the locking projection 13a of the ballpoint pen writing body 1a is locked to the locking step 25 of the ball portion 24 of the clip, and the writing tip of the ballpoint pen writing body 1a protrudes from the tip opening 29 of the barrel 20. Is done. (In this state, when the side face of the ball portion 24 is pressed and the clip is laterally deformed, the locked state is released and the writing tip is accommodated in the barrel.) Then, the rear end of the other ballpoint pen writing body 1b Knocking, the locking projection 13b
Pushes up the rear end portion 26 of the ball portion as appropriate to release the locking of the locking projection 13a and the locking step 25, and the ballpoint pen writing body 1a retreats. Further, when the ballpoint pen writing body 1b moves forward, the locking projection 13b is locked to the locking step 25, and the writing tip of the ballpoint pen writing body 1b protrudes from the distal end port 29 of the barrel 20.

When the writing tip of any of the writing pens of a ballpoint pen is inserted into a breast pocket or the like with the writing tip protruding,
Since the ball portion 24 of the clip 23 is pushed up with the cloth material, the locking is released and the writing tip is stored in the shaft cylinder 20, thereby avoiding an accident that the clothes are stained with ink. In the embodiment, in order to improve the usability of the unlocking, the tip of the clip is laterally deformed so that the unlocking can be performed. If the rear end of the ballpoint pen writing body is knocked, the writing tip of the ballpoint pen writing body that is protruded in a staggered manner is housed in the front end mouth, so that the clip does not necessarily have to be laterally deformable. Further, the side walls 27 may be provided on both sides.

Next, a second embodiment will be described. The ballpoint pen writing bodies 40a and 40b provided inside the shaft cylinder 41 are large-diameter objects having a circular ink storage tube. However, if the shaft cylinder 41 is formed in a rectangular shape and the short portion is gripped, it is easy to use. It is possible to have a good thickness. In addition, a thick refill of a desk-top ballpoint pen of this type can have compatibility as a writing body of a double-type writing instrument.

[0023]

The structure and operation of the present invention are as described above.
A convenient double-knock type ballpoint pen equipped with various types of ballpoint pen writing materials can be provided at a low cost and with a thickness of a shaft body satisfying usability. In addition, it is possible to design the shaft diameter as thin as possible and the shaft tip as smart as possible. In addition, if the clip is inserted into a breast pocket or the like with the writing tip protruding, the writing tip automatically sinks into the barrel so that there is no danger of soiling the clothes.

[Brief description of the drawings]

FIG. 1 is an overall front view of a cross section of a main part of a double knock ballpoint pen according to a first embodiment of the present invention, showing a state where a writing tip of one ballpoint pen writing body projects from a tip end opening of a barrel. ing.

FIG. 2 is a longitudinal sectional view corresponding to FIG.

FIG. 3 is a partially non-sectional longitudinal sectional view of the double knock ballpoint pen according to the first embodiment, showing a state in which a writing tip of a ballpoint pen writing body is stored.

FIG. 4 is a longitudinal sectional view of a principal part corresponding to FIG.

FIG. 5 is a longitudinal sectional view showing the entirety of a ballpoint pen writing body mounted on the double knock ballpoint pen of the present invention.

6 is a sectional view taken along line AA in FIG.

FIG. 7 is a longitudinal sectional view of a main part of a double knock ballpoint pen according to a second embodiment of the present invention, showing a state in which a writing tip of one ballpoint pen writing body projects from a tip end opening of a barrel. .

8 is a sectional view taken along the line BB in FIG. 7;

[Explanation of symbols]

 1a Ballpoint pen writing body 1b Ballpoint pen writing body 2 Joint 3 Front shaft 3a Inner hole 4 Ink reservoir 4a Retaining groove 5 Flange 6 Ink guide core 7 Ink guide core 8 Tip 8a Shaft 9 Tip ball 10 Ink storage tube 10a Closure Part 11 Ink 12a Tail plug 12b Tail plug 13a Locking projection 13b Locking projection 14a Locking piece 14b Locking piece 15a Locking section 15b Locking section 20 Shaft cylinder 21 Slit 22 Step section 23 Clip 24 Ball section 25 Stop step part 26 Rear end part 27 Side wall 28 Slit 29a Return spring 29b Return spring 30a Lock part 30b Lock part 40a Ball-point pen writing body 40b Ball-point writing body 41 Shaft barrel

Claims (2)

[Claims] 1. A tip holding a tip ball, a joint and an ink reservoir are integrally provided in series behind the tip, and the ink receiving pipe has a substantially rear end closed shape having a relatively large cross-sectional area. A ballpoint pen writing body in which the ink storage tube is filled with low-viscosity ink and an ink reservoir is fitted in an inner hole in the front part of the ink storage tube, and two types of the ballpoint pen writing body are mounted. In the double knock ballpoint pen, a clip having a locking step formed on the ball at the tip is provided at the rear of the barrel, and a slit is formed on the side of the shaft facing the clip. A locking projection is provided on a shaft side surface of the ink storage tube or a shaft side surface of a knocking portion provided rearward in conjunction with the ink storage tube, and the locking projection projects through the slit. A step is provided behind the tip of the cylinder
The ink storage tube is substantially non-deformed, and a long front shaft is provided between the front end of the ink storage tube and the writing tip. A return spring is inserted around the outer periphery of the front shaft, and the stepped portion is formed. A return spring is provided between the ink storage tube and the front end thereof to urge each of the ballpoint pen cursives backward.
The ballpoint pen writing body is advanced, and the writing tip is configured to project from the tip end of the barrel when the locking projection is locked to the locking step of the clip. Double knock ballpoint pen. 2. A step portion is integrally provided on a rear peripheral wall of a tip end opening of a barrel, and a linear locking portion is formed in front of a return spring, and the tip is engaged with the step portion of the barrel. 2. The double knock ballpoint pen according to claim 1, wherein the ballpoint pen is stopped.