JPH11254878A - Ball-point pen which is adaptive to internal core for ball-point pen with two kinds of shapes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a ball-point pen adaptive to two kinds of internal core by a method wherein in one barrel cylinder, a bar-shaped internal core which has a smaller diameter and a longer length, and another dimensional-form internal core which has a larger diameter and a shorter length, are made individually fittable. SOLUTION: For this ball-point pen 1, an internal core 2 is fitted in a barrel cylinder 4 in such a manner that the tip end of a chip 3 may be projected from the tip end opening 4a, and held. The internal core has two kinds, a bar-shaped internal core 2A and another dimensional-form internal core 2B. The barrel cylinder 4 is shorter than the internal core 2B, and the rear end of the internal core 2B protrudes from the rear end opening 4b, and a tail plug 10 is screwed on the rear end opening 4b. Then, for the tail plug 10, a contact part 14 with which the rear end face 11 of the internal core 2A comes into contact when the internal core 2A is inserted in the barrel cylinder 4, and a contact part 18 with which the rear end face comes into contact when the internal core 2B is inserted in the barrel cylinder 4, are provided. When the barrel cylinder 4 has a shape with bottom wherein the rear end is closed, a contact part for the internal cores 2A, 2B is provided on the bottom part. By this method, the ball-point pen is adaptive to the internal cores 2A, 2B with the two kinds of shapes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a single cylinder,
The present invention relates to a ballpoint pen adapted to two types of ballpoint pen cores, into which two different shapes of ballpoint pen cores can be individually inserted and written.

[0002]

2. Description of the Related Art A general ballpoint pen has a structure in which a ballpoint pen core is inserted into a shaft cylinder. Conventionally, the shape of the ballpoint pen core is divided into two types. One type is a rod-shaped type in which a ball-point pen tip is inserted into the tip of a thin, thin-tube ink storage tube, such as that found in a ball-point pen core that is inserted into a low-cost oil-based ink ball-point pen. Shape. Specifically, JIS
No. G, H, K, etc. in S6039, the outer diameter of the ink containing tube is 2.9 to 3.2 mm and the total length is 139.0 ± 1.5 mm (model code G); 5 ±
1.5 mm (model code H) and 98.2 ± 0.8 mm (model code K). Another type is for the rod-shaped ball-point pen, wherein the ink storage tube has a small-diameter portion in which a ball-point pen tip is inserted and a large-diameter portion larger than the outer diameter of the core-shaped ink storage tube for the ball-shaped ball-point pen. It has a multi-stage shape shorter than the entire length of the core. Specifically, JIS
In S6054, the ink container has a small-diameter portion, a medium-diameter portion, and a large-diameter portion having an outer diameter of 6.3 ± 0.3 mm where a ball-point pen tip is inserted.
11 ± 2 mm (standard type A) and 87 ± 2 mm (standard type B).

Conventionally, in a ball-point pen, a rod-shaped core for a ball-shaped pen having an outer diameter of about 3.0 mm is inserted into a shaft cylinder. However, it is not possible to insert a short multi-stage ballpoint pen core into the shaft cylinder for writing. In particular, a ball-point pen having a feeding mechanism has a structure in which the feeding mechanism does not operate normally even when a ball-point pen having a different shape is inserted into the barrel.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is directed to a rod-shaped ball-point pen core in which the shape of an ink storage tube is a straight cylinder, or the above-mentioned rod-shaped core. Both ball-point pen cores with a diameter larger than the outer diameter of the ink reservoir tube of the ball-point core and shorter than the overall length of the rod-shaped ball-point core are inserted into the shaft cylinder. It is possible to obtain a knock-type ballpoint pen which can be written and adapted to two types of ballpoint pen cores.

[0005]

According to the present invention, in order to achieve the above object, a ball-point pen tip is inserted into the tip of a straight ink container having an outer shape of about 3.2 mm or less in one shaft cylinder. Two different shapes of the core for a ball-point pen having a rod-shaped shape, or the core for a ball-point pen having a different dimension than the overall length of the rod-shaped ball-point pen and having a larger outer diameter of the ink container tube. Each of the ballpoint pen cores can be individually inserted, and can be written. The ballpoint pen is adapted to two types of ballpoint pen cores.

Furthermore, a ballpoint pen core is placed in the barrel,
The tip of the ball-point pen core abuts against the inner wall of the tip of the barrel, and the rear end is held by the inner wall of the tail plug or the tail plug disposed at the rear end of the barrel so as not to move back and forth. In the inserted ball-point pen, a first abutment on the rear end of the rod-shaped ball-point pen core inside the rear end of the barrel or the tail plug.
And a second abutting portion that abuts on the rear end of the ball-point pen core having the other dimension and shape, so that both ball-point pen cores can be individually inserted into the barrel. Things.

[0007] Alternatively, the ball-point pen core is inserted into the barrel while being biased rearward by a spring, and the tip of the ball-point pen core pen tip is inserted through a member abutting the rear end surface of the ball-point pen core. A ball-point pen having a feed-out mechanism for causing the rod-shaped ball-point pen to be protruded and retracted from the tip end opening of the barrel. A first contact portion for contacting a rear end portion of the rod-shaped core for a ball-point pen; and When the member is inserted, the tip end surface of the member is a second contact portion that abuts on the rear end surface of the ball-point pen core having the other dimensions, regardless of which ball-point core is inserted into the shaft cylinder. The member can be brought into contact with the member.

Further, the member comes into contact with the rear end face of the ball-point pen core, and is guided by a cam groove formed on the inner wall of the shaft cylinder or the inner cylinder by pressing or rotating the feeding mechanism, and slides back and forth. It is a rotating cam that moves and rotates.

In the present invention, the rod-shaped core for a ball-point pen, in which a ball-point pen tip is inserted into the tip of a straight ink container having an outer diameter of about 3.2 mm or less, is referred to as JIS S6039. Type code G,
Although there are dimensions and shapes indicated by H and K, the invention is not limited thereto. The ball-point pen core having a dimension smaller than the entire length of the rod-shaped ball-point pen core and having an outer diameter of the ink container tube larger than that of the ball-point pen core is defined by JIS S as described above.
6054, a bar-shaped die with a total length of 128 mm, in which a ball-point pen tip is inserted through a tip holder at the tip of a straight ink container having an outer diameter of about 5.5 mm, for example. Also refers to a shape.
That is, it refers to a ball-point pen core having a dimension other than a rod-shaped shape in which a ball-point pen tip is inserted into the tip of a straight ink container having an outer shape of about 3.2 mm or less.

[0010] A rod-shaped core for a ball-point pen having a ball-point pen tip inserted into the tip of a straight ink container tube having an outer shape of about 3.2 mm or less, and a length shorter than the entire length of the rod-shaped core for a ball-point pen. There is no particular limitation on the ink to be contained in the ball-point pen core, which has a large outer diameter of the ink storage tube and the shape of the core. Oil-based ink that can be filled is stored, but in the latter ballpoint pen core,
Aside from oil-based inks, aqueous inks held in fiber bundles and so-called gel inks having shear thinning properties are accommodated.

The feeding mechanism in the present invention is not limited to a specific one. A knock type or rotary type feeding mechanism may be used. The member in contact with the rear end face of the ballpoint pen core inserted into the barrel in the feeding mechanism is, for example,
A member formed integrally with the knocking body, or a member for contacting the rear end face of the ballpoint pen core and advancing the ballpoint pen core by pressing against the knocking body or rotating to the rotating body, or from a rotating cam. In the knock-type ball-point pen having the feeding mechanism, the rotary cam corresponds to the above-mentioned member.

The contact portion provided on the member that contacts the rear end of the ballpoint pen core may be a wall surface that contacts the rear end surface of the ballpoint pen core, or the rear end portion of the ballpoint pen core. May be an engagement hole.

A knock-type ballpoint pen adapted to two types of ballpoint pen cores is a rod-shaped ballpoint pen core having a ball-point pen tip inserted into the tip of a straight ink container tube having an outer shape of about 3.2 mm or less. Both the size of the ball-shaped pen and the one of the ball-shaped core for the ball-shaped pen having a dimension smaller than the entire length of the rod-shaped core for the ball-point pen and the outer diameter of the ink containing tube is large are both barrel cylinders. It can be inserted into the inside and can be written.
39, a ball-point pen core of all dimensions in the form of a rod-shaped mold indicated by type symbols G, H, K, etc .;
54, the core for a ball-point pen of all dimensions in a multi-stage shape having a small-diameter portion, a medium-diameter portion, and a large-diameter portion in which an ink container has a ball-point pen tip inserted therein, as specified in standard types A and B, It does not mean that it can be inserted.

[0014]

Embodiments of the present invention will be described with reference to the drawings. In the drawings, the same members and the same portions are indicated by the same reference numerals. The first shown in FIGS. 1 and 2
In the ballpoint pen 1 adapted to the two types of ballpoint pen cores according to the above embodiment, the ballpoint pen core 2 is formed by connecting the tip end of the ballpoint pen tip 3 of the ballpoint pen core 2 to the tip end opening 4 a of the barrel 4. It is inserted into the shaft cylinder 4 so as to be held in a protruded state.

The ball-point pen core 2 has an outer diameter of about 3.0 mm and an overall length of about 9 mm, which contains oil-based ink and is defined by a model code H according to JIS (S6039).
An 8.2 mm rod-shaped core for ball-point pens (hereinafter, simply referred to as a rod-shaped core for ball-point pens) 2A, and the ink container 6 has a small diameter in which the outer end of the ball-point pen tip 3 is inserted. Part 7, a main part 8 containing the oil-based ink, a large diameter part 8 having an outer diameter of about 6.0 mm, and a relay part 9 connecting the small diameter part 7 and the large diameter part 8. The ball-point pen cores of other dimensions and shapes (hereinafter simply referred to as ball-point pen cores of other dimensions and shapes) 2B.

The barrel 4 is formed to be shorter than the entire length of the ball-point pen core 2B of the other dimension and the rear end of the ball-point pen core 2B protrudes from the rear end opening 4b of the barrel 4. I have to do it. A tail plug 10 is provided in the rear end opening 4b.
Is screwed.

As shown in FIG. 1, when the ball-point pen core 2A having a rod-shaped shape is inserted into the shaft cylinder 4 as shown in FIG.
The rear end 11 of the ballpoint pen core 2A has a head 13 having an engagement hole 12 into which the ball pen can be inserted. The engagement hole 12 is a first contact portion 14 with which the rear end portion 11 contacts when the ballpoint pen core 2 </ b> A is inserted into the barrel 4. The rod-shaped core 2 </ b> A for a ball-point pen has an inner wall step 15 provided at the distal end of the shaft cylinder 4 in contact with the distal end of the ink storage tube 5, and a rear end 11 of the core 2 </ b> A for the ball-point pen.
Is held so as not to move back and forth with the first abutting portion 14 with which it abuts.

A hollow portion 16 is formed inside the distal end of the tail plug 10, and the inner wall surface 17 at the distal end of the head 13 is formed when the ball-point pen core 2 B having the other dimensions is inserted into the barrel 4. And a second contact portion 18 with which the rear end face contacts. The above-mentioned ball-point pen core 2 </ b> B has an inner wall at the tip end of the shaft cylinder 4 that comes into contact with the tip of the ink storage tube 6, similarly to the case where the rod-shaped ball-point core 2 </ b> A is disposed inside the shaft cylinder 4. The step portion 16 and the second contact portion 18 with which the rear end of the ball-point pen core 2B having the other dimensions come into contact are held so as not to move back and forth.

In this embodiment, the rear end opening 4 of the barrel 4
Although there is a structure in which a tail plug is screwed to b, although not shown,
The shaft cylinder 4 may have a bottomed shape with the rear end closed.
In this case, a first contact portion for the ball-point pen core 2A having the same rod shape as the tail plug 10 and a second contact portion for the ball-pen core 2B having other dimensions are formed at the bottom. What is necessary is just to provide a contact part.

The ball-point pens adapted to the two types of ball-point pen cores of the embodiment shown in FIGS. 3 to 11 are similar to the ball-point pen cores 2 described above in a state where they are urged rearward by a spring. The ball-point pen is provided with a feeding mechanism for disposing the tip of the ball-point pen tip 3 of the ball-point pen through the tip opening of the barrel.

A ball-point pen 51 adapted to two types of ball-point pen cores according to the second embodiment shown in FIGS.
The ball-point pen core 2 disposed in a state of being urged rearward by the coil spring 52,
By pressing the knocking body (member) 53 connected to the rear end of the ballpoint pen, the tip of the ballpoint pen tip 3 of the ballpoint pen core 2 is moved from the tip opening 55 of the shaft cylinder 54 as the knocking body 53 moves back and forth. It is something that appears and disappears.

The feeding mechanism in the present embodiment is a conventionally known mechanism, and will be briefly described. The knocking body 53 causes the knocking portion 57 to protrude from the rear end opening 56 of the shaft cylinder 54 and the shaft body 54. Is provided with a locking projection 58 which resiliently projects outward. The peripheral side surface 59 of the shaft cylinder 54 includes the shaft cylinder 5
A locking hole 60 extending in a direction along the axis of No. 4 is formed,
A narrow passage portion 61 is provided at the center. Locking projection 5
8, a portion 58a wider than the width of the passage portion 61 and a portion 58b narrower than the width of the passage portion 61 are formed. Locking projection 58
Is engaged and disengaged alternately with the front portion 60a and the rear portion 60b of the locking hole 60. By pressing the knocking portion 57 of the knocking body 53, the locking projection 58 is displaced inward,
The narrow portion 58b reaches the front portion 60a through the passage portion 61 of the locking hole 60, and as shown in FIG.
8a is engaged with the front portion 60a, and the ballpoint pen core 2
The tip ends of the ballpoint pen tips 3 of A and 2B are held in a state of protruding from the tip end opening 55 of the barrel 54.
In order for the tip portions of the ballpoint pen tips 3 of the ballpoint pen cores 2 </ b> A and 2 </ b> B to be immersed through the tip opening portion 55 of the barrel 54,
By pressing the wide part 58a of the locking projection 58 in the axial direction, the narrow part 58b reaches the rear part 60b through the passage part 61 of the locking hole 60, and the wide part 5
8a is locked to the rear portion 60b so that the immersion state is maintained.

When the ball-point pen core 2B of the other dimensions and shape is inserted into the barrel 4, the wide end portion 58a of the locking projection 58 is shifted to the rear portion 60b. And the tip of the ball-point pen tip 3 is formed so as to abut the rear end face of the ball-point pen core 2B in a state of being immersed through the tip opening 55 of the shaft cylinder 54. The distal end surface 53a is a second contact portion 62 that contacts the rear end surface of the ball-point pen core 2B having the other dimension and shape.
When the rod-shaped core 2A for a ball-point pen is inserted into the center of the tip end surface 53 of the knocking body 53, the rear end 11 is engaged with the core 2A for a ball-point pen urged rearward. An engagement hole 63 is provided as a first contact portion 64 that contacts the rear end 11 of the rod-shaped ballpoint pen core 2A.

In FIGS. 3 to 5 for explaining the present embodiment, clips are not shown, but they are omitted for the sake of convenience, and the present embodiment is limited to a ballpoint pen without clips. It does not mean. The clip does not have to be mounted on the barrel, and may be mounted.

A ballpoint pen 10 adapted to two types of ballpoint pen cores according to the third embodiment shown in FIGS.
Reference numeral 1 denotes an embodiment having another feeding mechanism. The ball-point pen core 2 disposed in a state of being urged rearward by the coil spring 52 presses the knock body 102 connected to the rear end of the ball-point pen core 2 so that the knock body 102 moves forward and backward. Accordingly, the tip 3 of the ballpoint pen tip of the ballpoint pen core 2 is made to protrude and retract from the tip end opening 104 of the barrel 103.

The feeding mechanism in the present embodiment is a conventionally known mechanism, and will be briefly described. The clip member 105 is knocked so as to resiliently project outward from the barrel 103 via the upright piece 106. 102 are integrally formed. The knock body 102 is disposed in the shaft cylinder 103 so as to contact the rear end face of the ballpoint pen core 2 disposed in a state of being urged rearward by the coil spring 52. By the pressing operation of the knock body 102 toward the tip opening 104 of the barrel 103, the ballpoint pen core 2 protrudes from the tip opening 104 of the barrel 103, and the clip member 10.
5 is a locking hole 1 formed in the shaft cylinder 103 by a protrusion 107 at the tip.
08 to enable the ball-point pen core 2 to protrude and retract from the distal end opening 104 of the barrel 103.

The knock body 102 has a tip surface 102a.
However, similar to the knock body 53 in the second embodiment, when the ball-point pen core 2B of another size and shape is inserted into the barrel 103, the tip of the ball-point pen tip 3 of the ball-point pen core 2B. Is formed so as to contact the rear end face of the ball-point pen core 2 </ b> B in a state of being immersed through the front end opening 104 of the barrel 103. The distal end surface 102a serves as a second contact portion 109 that contacts the rear end surface of the ball-point pen core 2B having the other dimension and shape. Tip surface 10 of knock body 102
At the center of 2a, an engaging hole 110 is provided for engaging the rear end 11 with the ball-point pen core 2A urged rearward when the rod-shaped core 2A is inserted. The first contact portion 111 contacts the rear end portion 11 of the rod-shaped ball-point pen core 2A.

The second embodiment of the fourth embodiment shown in FIGS.
Ballpoint pen 2 suitable for ballpoint pen cores of various shapes
Reference numeral 01 denotes an embodiment provided with a feeding mechanism using the rotating cam 202. The shaft cylinder 203 has a structure in which a front shaft 203a and a rear shaft 203b are screwed. The feeding mechanism includes a rotating cam 202, a cam groove 204 formed on the inner wall surface of a rear shaft 203b for slidingly guiding and rotating the rotating cam 202 forward and backward, and a rotating cam 2 contacting the rotating cam 202.
And a knock body 206 having a rear end 206b protruding outward from a rear end opening 205 of a rear shaft 203b, which is engaged with a cam groove 204 for sliding the front end 02 forward and backward. The rotating cam 202 is disposed so as to contact the rear end of the ballpoint pen core 2 urged rearward by the coil spring 52. By pressing the knocking body 206 that has come into contact with the rotary cam 202, the front end of the ballpoint pen tip 3 of the ballpoint pen core 2 is moved along with the forward and backward movement of the knocking body 206.
3a.

The rotary cam 202 which comes into contact with the rear end of the ball-point pen core 2 has a tip end surface 202a similar to that of the knocking body 53 in the second embodiment. When the ball-point pen core 2B is inserted into the shaft cylinder 203, the tip of the ball-point pen tip 3 of the ball-point pen core 2B comes into contact with the rear end face of the ball-point pen core 2B in a state of being immersed from the tip opening 207 of the shaft cylinder 203a. Formed and arranged. Tip surface 202 of the rotating cam 202
“a” is a second contact portion 208 that contacts the rear end face of the ball-point pen core 2B having the other dimension and shape. Rotating cam 20
2 is provided with an engagement hole 209 for engaging the rear end portion 11 of the rod-shaped ball-point pen core 2A when the ball-point pen core 2A is inserted rearward when the ball-point core 2A is inserted.
The first contact portion 210 contacts the rear end portion 11 of the rod-shaped ball-point pen core 2A.

9 to 11 for explaining a fourth embodiment.
In the above, the clip is not shown as in the case of the second embodiment, but this is simply omitted for convenience, and does not mean that the present embodiment is limited to a ballpoint pen without a clip. Absent. The clip does not have to be mounted on the barrel, and may be mounted.

[0031]

The present invention is a ball-point pen adapted to the above-mentioned two types of ball-point pen cores. For example, a straight ink container tube containing oil-based ink and having an outer shape of about 3.2 mm or less is used. For a ball-shaped ball-point pen with a ball-point pen tip inserted at the tip, for a ball-shaped ball-point pen with a smaller diameter than the overall length of the rod-shaped ball-point pen core and a larger outer diameter of the ink storage tube. If the core contains water-based ink or so-called gel ink with shear thinning properties, there is an advantage that one ballpoint pen can be used as an oil-based ballpoint pen or as a water-based ballpoint pen or gel ink ballpoint pen. No need for a special barrel, which contributes to resource saving.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention, in which a rod-shaped core for a ball-point pen is inserted into a barrel, with the tip of the ball-point pen tip always projecting from the tip opening of the barrel. ,
It is principal part sectional drawing of the ball-point pen adapted to the two types of ball-point pen cores.

FIG. 2 is a perspective view of a first embodiment of the present invention, in which a ball-point pen having a different size and shape is mounted in a barrel, with the tip of the ball-point pen tip always projecting from the tip opening of the barrel.
It is principal part sectional drawing of the ball-point pen adapted to the two types of ball-point pen cores.

FIG. 3 shows a ball-point pen according to a second embodiment of the present invention, in which a rod-shaped core for a ball-point pen is inserted into a shaft cylinder and adapted to two types of ball-point cores having a feeding mechanism. It is principal part sectional drawing of.

FIG. 4 is a perspective view of a ball-point pen according to a second embodiment of the present invention, in which a ball-point pen having a different size and shape is inserted into a barrel, and is adapted to a ball-point pen having two kinds of shapes with a feeding mechanism. It is principal part sectional drawing of.

FIG. 5 is a view illustrating a state in which a tip of a ballpoint pen tip of a ballpoint pen is protruded from a tip end opening of a barrel by a feeding mechanism according to a second embodiment of the present invention. 1 is a cross-sectional view of a main part of a ballpoint pen adapted to FIG.

FIG. 6 shows a third embodiment of the present invention, in which a rod-shaped core for a ball-point pen is inserted into a barrel, and is adapted to a ball-point pen having two different shapes with another feeding mechanism. It is principal part sectional drawing of the ball-point pen which was done.

FIG. 7 shows a third embodiment of the present invention, in which a ball-point pen having another size and shape is inserted into a barrel, and is adapted to a ball-point pen having two different shapes provided with another feeding mechanism. It is principal part sectional drawing of the ball-point pen which was done.

FIG. 8 shows two types of ballpoint pen cores according to a third embodiment of the present invention, in which the tip of a ballpoint pen ballpoint pen tip protrudes from a tip end opening of a barrel by a feeding mechanism. 1 is a cross-sectional view of a main part of a ballpoint pen adapted to FIG.

FIG. 9 is a perspective view of a ball-point pen according to a fourth embodiment of the present invention. 1 is a cross-sectional view of a main part of a ballpoint pen adapted to FIG.

FIG. 10 is a perspective view of a ball-point pen having two different shapes according to a fourth embodiment of the present invention. 1 is a cross-sectional view of a main part of a ballpoint pen adapted to FIG.

FIG. 11 shows two types of ball-point pens according to the fourth embodiment of the present invention, in which the tip of the ball-point pen for a ball-point pen is projected from the tip opening of the barrel by the mechanism for feeding the rotary cam. It is principal part sectional drawing of the ball-point pen adapted to the use center.

[Explanation of symbols]

1, 51, 101, 201 Ballpoint pens adapted to two types of ballpoint pen cores 2A Rod-shaped ballpoint pen cores 2B Ballpoint pen cores of other dimensions 3 Ballpoint pen tip 4, 54, 103 Shaft barrel 5, Reference Signs List 6 Ink storage tube 10 Tail plug 11 Rear end portion 12, 63, 110, 209 Engagement hole 14, 64, 111, 210 First contact portion 18, 62, 109, 208 Second contact portion 52 Coil spring 53, 102, 206 Knock body 202 Rotating cam

Claims (4)

[Claims] 1. A rod-shaped ball-point pen core in which a ball-point pen tip is inserted into the tip of a straight ink container having an outer diameter of about 3.2 mm or less in one shaft cylinder, or the rod-shaped ball-point pen. A ball-point pen core of a different size and shape with a smaller diameter than the overall length of the core and a larger outer diameter of the ink storage tube.
Both types of ballpoint pens with different shapes can be individually inserted and writable. Ballpoint pens suitable for two types of ballpoint pens. 2. A ball-point pen core is disposed in a barrel, and the tip of the ball-point pen core is in contact with the inner wall surface of the tip of the barrel, and the rear end is disposed at the rear end or the rear end of the barrel. In a ball-point pen that is held by the inner wall surface of the tail plug and inserted so as not to move back and forth, the ball-point-shaped ball-point pen core abuts on the rear end of the barrel or inside the tail plug. A first contact portion and a second contact portion contacting the rear end of the ball-point pen core having the other dimensions are provided so that both ball-point pen cores can be individually inserted into the barrel. 2. The method according to claim 1, wherein
Ballpoint pen suitable for ballpoint pen cores of various shapes. 3. A tip of a ballpoint pen tip of a ballpoint pen core inserted through a member which is inserted into the shaft cylinder in a state where the ballpoint pen core is biased rearward by a spring and abuts against a rear end surface of the ballpoint pen core. In a ball-point pen equipped with a feed-out mechanism for causing the shaft to protrude and retract from the tip end opening of the barrel, the member includes:
When the rod-shaped core for ball-point pens is provided, an engagement hole is provided for engaging a rear end portion of the rod-shaped core for ball-point pens, and the engagement hole is replaced with the rod-shaped ball-point pen. A first contact portion that abuts a rear end portion of the core for use, and when the core for ball-point pens having the other dimensions is inserted, the tip end surface of the member is positioned behind the core for ball-point pens for other dimensions. 2. A second contact portion that abuts on the end face, and can be in contact with the member regardless of which of the ballpoint pen cores is inserted into the barrel. 3.
2. A ballpoint pen adapted to the two types of ballpoint pen cores described in 1. above. 4. The member comes into contact with the rear end surface of the ball-point pen core, and is guided by a cam groove formed on the inner wall of the shaft cylinder or the inner cylinder by pressing or rotating the feeding mechanism, and slides back and forth. 4. The rotating cam according to claim 3, wherein the rotating cam is rotated.
Ballpoint pen suitable for ballpoint pen cores of various shapes.