JPH09226286A - Ball-point pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball-point pen capable of properly absorbing a writing impression force concentrated on the tip of a pen ball part, mitigating fatigue accumulated in the arm or shoulder of a user and inhibiting the generation of an ink leak on the tip of a pen point. SOLUTION: This ball-point pen consists of a pen main body 1, a freely curving pen center 2 installed inside the pen body 1, a pen point guide member 3 at the tip part of the pen body 1 and a ball part rear end retaining member at the rear end part of the pen main body 1. The pen point guide member 3 is formed of an elastic member with a space part in the peripheral inner part of the pen ball part 2. In addition, two notched grooves 3A, 3B formed at a specified interval along a center axis are provided on part of the tip part of the pen ball guide member 3. Further, a pen point cover piece 4Z liberated from the tip part of the pen point guide member 3, is mounted on the tip part of a strip-shaped tongue piece part 3Z held between the two notched grooves 3A, 3B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballpoint pen, and more particularly to a ballpoint pen in which a pen core is detachably mounted in a pen body.

[0002]

2. Description of the Related Art Generally, a commercially available ball-point pen has a pen core, which is a writing section, detachably mounted in a pen body, and a tip of the pen core is made of a metal member or other hard member. It is firmly held by the members. Therefore, such a conventional example has an optimal structure for writing a plurality of sheets of paper in an overlapping manner. Further, the ball-point pen has been widely used from the past because it can be brought into contact with the paper smoothly by the ball incorporated in the tip portion.

[0003]

In the above-mentioned conventional example, since the pen core part is firmly held by the pen core part holding member of the pen body part, the pen body part is firmly attached to the pen body part when writing characters or the like. The applied writing pressure is directly concentrated and applied to the tip of the pen core. Therefore, the pressing force that comes into contact with the paper is returned to the arm or shoulder directly through the wrist as its reaction force. For this reason, when this is used for a long time, unlike the case of a fountain pen having an elastic tip, in many cases, there is the inconvenience that fatigue easily accumulates on the arms and shoulders.

Further, in the above-mentioned conventional example, as described above, when writing characters or the like, the writing pressing force applied to the pen body is directly applied to the pen tip (tip of the pen core) as it is. Therefore, the ball of the pen tip or the rotating surface of the holding member thereof is easily damaged for a long period of time, which sometimes causes ink pooling in the pen tip, which causes ink marks (ink However, there is an inconvenience that an irregular break line or the like is caused in a drawn character or the like due to the occurrence of foreign matter or air that enters and is dried to deteriorate ink delivery.

On the other hand, conventionally, in order to suppress the occurrence of the ink burrs or the like and improve the durability, for example, a method of increasing the hardness of the ball of the pen tip (tip of the pen core) or the rotating surface of the holding member thereof. However, there has always been an inconvenience that a large amount of capital investment and labor are required for the development of the material and the manufacturing method therefor.

[0006]

It is an object of the present invention to improve the inconveniences of the conventional example, and to appropriately absorb the writing pressure which is concentrated on the tip of the pen core during writing, thereby allowing the user's arm and Effectively reduces the fatigue accumulated on the shoulder, further suppresses the generation of ink spills at the tip of the pen core,
Therefore, it is an object of the present invention to provide a ballpoint pen in which the quality of ink characters is improved and the durability of the tip of the pen core is improved.

[0007]

In order to achieve the above object, according to the invention of claim 1, a cylindrical pen main body, a pen provided in the pen main body, ink is stored in the pen main body, and a writing portion is provided at the tip. And a pen core part that is formed to be bendable, a pen tip guide member that is attached to the tip part of the pen body part corresponding to the writing part of the pen core part, and is attached to the rear end part of the pen body part Further, there is provided a core rear end holding member which holds the pen core at its rear end while maintaining a state in which the writing portion of the pen core described above partially projects from the pen tip guide member.

Further, the pen tip guide member is formed of a soft member having elasticity and a space portion in an inner portion around the pen core portion, and a predetermined interval is provided at a part of the tip end portion of the pen tip guide member. At least two cut grooves are provided in a direction along the central axis with a space between them. Then, at the tip of the strip-shaped tongue piece formed by being sandwiched between these two cut grooves,
The pen tip cover piece, which is separated from the tip of the pen tip guide member, is integrally provided.

Therefore, in the invention described in claim 1,
When the writing is performed with the strip-shaped tongue piece portion 3Z facing downward (in the S direction in FIG. 5), there is nothing on the left side (upper side when inclined) of the pen tip guide member 3 in FIG. 5A. Since there is no cut groove or the like, the pen tip guide member 3 does not curve at all. Therefore, in this case, it functions as a normal ball-point pen.

On the other hand, FIG. 5B shows a case where the strip-shaped tongue piece 3Z is written toward the left side (the upper side when tilted). When the writing operation in the S direction is started in such a state, the writing pressure applied to the pen core portion 2 causes the pen tip cover piece 4Z to resist the elastic force of the strip-shaped tongue piece 3Z. ), It is pushed out to the left. The eccentric distance in this case varies depending on the pressing force, but the maximum is about 1 [m
m]. Then, the writing portion 2A portion of the pen core portion 2 is eccentric with respect to the original center axis X by this protrusion.

When the writing operation is stopped, the tip portions of the pen core portion 2 and the pen tip guide member 3 are immediately returned to the state shown in FIG. 1 by their elastic return forces as described above.
Therefore, when a writing pressure is applied more than necessary during the writing operation, the pen core portion 2 is biased by the writing portion 2A portion as compared with the conventional example, and flexibly bends in a state similar to that of a fountain pen, As a result, excessive writing pressure can be effectively absorbed.

According to the second aspect of the present invention, the pen tip cover piece described above is formed into a semi-circular pen tip cover piece in conformity with the tip of the pen tip guide member.
Therefore, the invention according to claim 2 has the same function as that of the invention according to claim 1 described above, and the eccentric movement of the writing portion 2A of the pen core portion 2 is performed on the entire surface of the pen tip cover piece. As a result, the eccentric movement of the pen core 2 can be easily permitted.

According to a third aspect of the present invention, the pen tip cover piece described above is formed into an annular pen tip cover piece in alignment with the tip of the pen tip guide member. Therefore, the invention according to claim 3 has the same function as that of the invention according to claim 1 described above, and the reciprocating eccentric movement of the writing portion 2A of the pen core portion 2 is performed on the entire surface of the pen tip cover piece. Since the pen core portion 2 is designed to receive the reciprocating eccentric movement, the elastic force of the pen core portion 2 itself can be used to restore the elasticity of the strip-shaped tongue piece 3Z. It is also possible to reduce the force (enlarge the width of the two cut grooves to reduce the width of the strip-shaped tongue portion 3Z).

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

First, in FIG. 1, reference numeral 1 indicates a cylindrical pen body. Although the outer shape of the cylindrical pen body 1 is formed in a cylindrical shape, it may be square or hexagonal. Inside the pen body 1, the ink W
The pen core portion 2 having a writing portion 2A at its tip and formed to be bendable is stored. Here, in the pen core portion 2, the writing portion 2A portion is formed of a metal member,
The ink storage portion 2B connected to the writing portion 2A is made of bendable plastic.

The pen body 1 has an inner diameter as shown in FIG.
As shown in FIG. 3, the lower end portion (inner diameter side of the male screw portion) is set to be slightly larger than the pen core portion 2, so that the pen core portion 2 does not irregularly bend in the pen body portion 1 and The degree of bending is moderately suppressed. When the writing portion 2A portion of the pen core portion 2 is slightly eccentric from the central axis portion, as will be described later, the pen core portion 2 is curved with the lower end region of the pen body 1 as a reference.

The tip of the pen body 1 (the lower end in FIG. 1)
Is equipped with a cylindrical pen tip guide member 3 having a narrow tip. The pen tip guide member 3 is set in a state where the tip end portion of the pen core portion 2 described above is fitted and at the same time, the upper end portion thereof is detachably screwed to the lower end portion of the pen body portion 1 described above.

In this embodiment, the pen tip guide member 3 is formed of a plastic member having elasticity. Further, the pen tip guide member 3 has a space area in the inner portion around the pen core portion 2, and further has at least two portions in a direction along the central axis at a predetermined interval from each other at a part of the tip end portion thereof. It is provided with cut grooves 3A and 3B. Reference numeral 3Z indicates a strip-shaped tongue piece formed by being sandwiched between the two cut grooves 3A and 3B.

Reference numerals 3Aa and 3Ba denote through holes for preventing cracks provided in the deep portions of the cut grooves 3A and 3B. Of these, the strip-shaped tongue portion 3Z is shown in FIG.
Although the width is set smaller than the diameter of the pen core 2, the width may be set larger than the diameter of the pen core 2.

At the tip of the strip-shaped tongue piece 3Z, the pen-tip cover piece 4Z separated from the tip of the pen-tip guide member 3 is integrally mounted on the strip-shaped tongue piece 3Z. ing. In this first embodiment, the pen tip cover piece 4Z is a semi-annular member that matches the tip of the pen tip guide member 3 described above.

The strip-shaped tongue piece 3Z and the strip-shaped tongue piece 3Z at the tip thereof are actually the pen tip guide member 3.
Are sequentially formed from the center of the lower end edge in FIG. 3 with the cut grooves 3C and 3D. Here, the two cut grooves 3A and 3B are cut in the direction orthogonal to the paper surface of FIG.

The width of the strip-shaped tongue piece 3Z formed by the two cut grooves 3A, 3B is set to be smaller than the diameter of the pen core portion 2 described above. For this reason,
The strip-shaped tongue portion 3Z itself has a function of appropriately bending against elasticity when pressed by the pen core portion 2 from the inside during a writing operation, and at the same time, the elastic function facilitates returning to the original position. There is. In this case, the pen core 2 is slightly eccentric from the inner side to the outer side, but the eccentricity is actually at most 1 [mm].

Therefore, due to the eccentricity of the pen core 2 during the writing operation, the pen core 2 is pushed between the two cut grooves 3A and 3B (the inner space formed by pushing out the lower end of the strip-shaped tongue piece 3Z). ), But since the pen tip guide member 3 itself has elasticity, it is immediately returned to the original position when the pressing force during the writing operation decreases. That is, the original position restoring force of the pen core portion 2 is a synergistic effect of the elastic force of the strip-shaped tongue piece portion 3Z itself and the elastic force between the edge portions of the pen tip guide member 3 forming the cut grooves 3A and 3B. Is rapidly generated as a reaction force against the pressing force, which makes it possible to obtain good followability and good writing quality.

At the rear end of the pen body 1 (upper part in FIG. 1, not shown), the writing portion 2A of the pen core 2 is provided with the tip of the pen tip guide member 3 (lower end in FIG. 1). ), The pen core rear end holding member (FIG. 1) that holds the rear end (upper end in FIG. 1) of the pen core 2 at the rear end of the pen body 1 while maintaining a state of partially protruding from Equipped (not shown).
This prevents the pen core 2 from penetrating and separating from the pen body 1 during the writing operation.

On the inner diameter side of the tip portion of the above-mentioned pen tip guide member 3, between the small inner diameter on the pen tip side (lower side in FIG. 4) and the large inner diameter on the opposite side (upper side in FIG. 4). An inner step portion 3G is provided in the switching area. The inner stepped portion 3G is provided corresponding to the core-side stepped portion 2a which is previously formed in the pen core portion 2 described above. The semi-annular pen tip cover piece 4Z is arranged at the same position in the radial direction as shown in FIGS. 1 to 4 according to the inner step 3G, and the core side step 2a of the pen core 2 is described above. It can be adapted to.

Further, the pen tip guide member 3 is formed in a conical shape so that the outer shape of the tip end portion becomes thinner toward the end portion. For this reason, the pen tip guide member 3 is formed such that the intermediate thickness thereof becomes thinner toward the tip end portion, whereby the above-mentioned strip-shaped tongue piece portion 3Z is easily bent from the inside toward the outside. ing. Further, reference numeral 3E
Indicates a through-hole provided in the strip-shaped tongue portion 3Z. By appropriately setting the length and width of the through hole 3E, the rigidity and elastic strength of the strip-shaped tongue piece 3Z can be changed.

In this case, the length of the through-hole 3E is illustrated as being shorter than the length of the cut grooves 3A and 3B in FIG. 1, but may be longer than the length of the cut grooves 3A and 3B. Further, the penetrating guide hole 3E may be eliminated by appropriately setting the softness of the material of the pen tip guide member 3. In addition, the basic and well-known configuration necessary for the ballpoint pen is directly adopted in this embodiment.

Next, the operation of the above embodiment shown in FIGS. 1 to 4 will be described.

First, the pen tip guide member 3 is attached to the pen body 1.
After that, the pen core 2 is inserted from the rear end (upper end side in FIG. 1) of the pen body 1, and a pen core rear end holding member (not shown) is screwed into the rear end. . This allows
Assembly of the ball-point pen shown in FIG. 1 is completed.

In this case, a pen core rear end holding member (not shown) is mounted on the upper end of the pen body 1 by screwing,
As a result, the core-side step portion 2 of the pen core 2 is attached to the inner step portion 3A.
a is engaged, the pen core portion 2 is held by a pen core rear end holding member (not shown) and the pen tip guide member 3, and the pen core portion 2 pops out from the tip end portion of the pen tip guide member 3. It is prevented. In this case, the pen core 2 is sufficiently held by only the pen core rear end holding member.

Next, the writing operation is started. First, as shown in FIG. 5, a case is set in which the entire ball-point pen is tilted by about 70 ° and writing operations are sequentially performed in the direction A. FIG.
(A) shows a case where the strip-shaped tongue piece 3Z is written downward. In this case, since the lower end portion of the pen tip guide member 3 has no cut groove or the like, the lower end portion of the pen tip guide member 3 does not curve at all. Therefore, in this case, it functions as a normal ball-point pen.

On the other hand, FIG. 5 (B) shows a case where the strip-shaped tongue piece 3Z is written with its upper side facing. When the writing operation is started in such a state, the writing pressure applied to the pen core 2 causes the pen tip cover piece 4Z to resist the elastic force of the strip-shaped tongue piece 3Z, as shown by a broken line (two-dot chain line). Is extruded to the outside. The eccentric distance in this case varies depending on the pressing force, but is set to about 1 mm at the maximum.

Then, the writing portion 2A portion of the pen core portion 2 is inclined with respect to the original central axis X by this protrusion.

When the writing operation is stopped, the tip portions of the pen core portion 2 and the pen tip guide member 3 are immediately returned to the solid line state as described above by their elastic return forces.

In the first embodiment, since it is constructed and functions as described above, if a writing pressing force is applied more than necessary during the writing operation, the pen core portion 2 will be written in comparison with the conventional example. It is urged by the portion 2A and flexibly bends in a state similar to that of a fountain pen, so that it is possible to effectively absorb an excessive writing pressing force. Therefore, for the paper generated in the conventional example described above. The degree to which the reaction force of contact pressure bounces directly to the arm or shoulder via the wrist is effectively reduced,
In this respect, it is possible to reduce the accumulation of fatigue in the arms and shoulders that has conventionally occurred, and obtain a so-called easy-to-write state.

Further, as described above, the tip portion of the pen tip guide member 3 effectively absorbs the excessive writing pressing force, so that the ball of the pen tip or the rotating surface of the holding member thereof has been damaged as in the conventional example. Can be effectively reduced without increasing the hardness of the material, and therefore, it is possible to reduce ink pooling that has occurred in the ball portion of the pen tip and to smoothly carry out the ink for a long period of time. Occurrence of irregular break lines can be suppressed, and durability can be improved in this respect.

Further, in the first embodiment, even if the writing portion of the pen core portion is suddenly eccentrically moved by the writing pressure, the pen tip cover piece is entirely in contact with the pen core portion. Since the eccentricity is allowed only on one side of the tip end portion of the pen tip guide member 3,
Depending on the application, both a soft writing feel and a conventional hard writing feel can be obtained.

[Second Embodiment] Next, a second embodiment will be described with reference to FIGS. 6 to 8. 6 to 8
In the second embodiment shown in FIG. 1, the pen core locking mechanism 11 for locking the pen core 2 is provided in the pen tip guide member 3 (pen main body 1
It can be used inside) as well.

The pen core locking mechanism 11 is composed of a stepped portion 11A provided at the upper end of the pen tip guide member 3 and a locking member 11B detachably mounted on the stepped portion 11A. It is configured so that the protrusion 2C provided at a predetermined position of the pen core portion 2 inserted from above in FIG. 8 can be locked. The protrusion 2C is provided at an optimum position where the writing portion 2A of the pen core 2 appropriately protrudes downward as shown in FIG. In FIG. 8, the protrusions 2C are provided at four locations around the pen core 2 at equal intervals, but they may be provided at two locations.

The protrusion 2C may be formed by melting a part of the pen core 2. Reference numeral 12 denotes an annular member made of rubber for returning to the original position. Thereby, the strip-shaped tongue piece portion 3 pushed out by the writing pressure applied to the pen core portion 2 is pushed out.
The return to the original position of Z is performed more quickly. Other configurations are the same as those in the case of FIG. 1 (first embodiment) described above. Reference numeral 3R indicates a rubber-made in-situ return spring formed in an annular shape.

Therefore, also in the second embodiment, it is possible to obtain substantially the same operational effects as in the case of the first embodiment described above, and unlike the first embodiment described above, the pen core Since the pen core portion locking mechanism 11 holds the portion 2, it is not necessary to receive the pen core portion 2 by the pen tip guide member 3 (see FIG. 4), and thus the tip portion of the pen tip guide member 13 is not necessary. Since the degree of freedom in design is increased in terms of strength, such as by reducing the wall thickness, the shape and the like can be freely determined according to the application.

[Third Embodiment] Next, a third embodiment will be described with reference to FIGS. 9 to 10. The third embodiment shown in FIGS. 9 to 10 has two cut grooves 3 of the pen tip guide member 3 provided in the first embodiment of FIG. 1 described above.
A feature is that a cut groove 3H including the tip edge of the pen tip cover piece 4Z described above is provided in an intermediate region between A and 3B. Other configurations are the same as those in the case of FIG. 1 (first embodiment) described above.

Even in this case, in addition to the same effects as the case of the above-described FIG. 1 (first embodiment), there is an advantage that the curving operation of the writing section 2A can be performed more smoothly.

[Fourth Embodiment] Next, a fourth embodiment will be described with reference to FIGS. 11 to 14. The fourth embodiment shown in FIGS. 11 to 14 corresponds to the first embodiment shown in FIG.
A feature is that the pen tip cover piece 4Z provided in the embodiment is a pen tip cover piece 14Z made of an annular member.

Further, the pen tip cover piece 14Z includes
Two layered slice grooves 14Za, 14Zb are provided from the back side thereof toward the strip-shaped tongue portion 3Z side (the layered slice grooves 14Za, 14Zb may not be provided depending on the material of the annular member). . Other configurations are the same as in the case of the first embodiment (FIGS. 1 to 4) described above.

Even in this case, in addition to having the same effects as the first embodiment (FIGS. 1 to 4) described above, since the pen tip cover piece 14Z is formed into an annular shape, it is easy to process. Since the entire inner diameter surface of the pen tip cover piece 14Z receives the reciprocating eccentric movement of the writing portion 2A of the pen core portion 2, the reciprocating eccentric movement of the pen core portion 2 can be easily allowed. Therefore, by utilizing the restoring elastic force of the pen core 2, the elastic restoring force of the strip-shaped tongue piece 3Z can be reduced (the width of the strip-shaped tongue piece 3Z can be increased by increasing the width of the two cut grooves). Can be reduced). Further, in some cases, the strip-shaped tongue piece 3Z may be replaced with a wire-shaped member (in this case, the two cut grooves are relatively wide cut grooves).

[Fifth Embodiment] Next, a fifth embodiment will be described with reference to FIG. The fifth embodiment shown in FIG. 15 corresponds to the above-described fourth embodiment (FIGS. 11 to 1).
In addition to having an annular pen tip cover piece 14Z similar to that of 4), the above-described second embodiment (FIGS. 6 to 8)
In the same manner as in the above case, the pen core locking mechanism 11 for locking the pen core 2 is provided inside the pen tip guide member 3 (pen main body 1
It can be used inside) as well.

Further, in the fifth embodiment, a space is provided between the tip inner diameter side of the pen tip guide member 3 and the periphery of the tip end portion of the pen core portion 2, whereby the inside of the pen tip guide member 3 is formed. Then, the pen core 2 can be freely eccentric. Other configurations are the same as those in the fourth embodiment (see FIG. 1).
1 to FIG. 14).

In this way as well, in addition to the effects and advantages similar to those of the above-described fourth embodiment (FIGS. 11 to 14), the pen core 2 is locked in the tip of the pen tip guide member 3. Since there is no need, the material and shape of the pen tip guide member 3 can be freely set, and there is an advantage that various social requirements can be met.

[Sixth Embodiment] Next, a sixth embodiment will be described with reference to FIGS. The sixth embodiment shown in FIGS. 16 to 17 has an annular pen tip cover piece 2 equivalent to that of the fifth embodiment (FIG. 15) described above.
4Z and the pen tip cover piece 2
4Z is inclined to the upper end surface 24Zc in FIG. 17 from the opposite side of the strip-shaped tongue portion 3Z (right end side in FIG. 17) toward the strip-shaped tongue portion 3Z side (left end side in FIG. 17). It features a point with a surface.

On the lower end surface of the pen tip guide member 3 in FIG. 16 (the surface facing the pen tip cover piece 24Z),
A similar cut-down bottom surface (sloping bottom surface) is attached. Further, only one layered slice groove 14Za is formed. Other configurations are the same as those in the fifth embodiment (see FIG. 1).
It is the same as the case of 5).

In this way as well, in addition to the same effects as the case of the fifth embodiment (FIG. 15) described above, a step portion for locking the core side step portion 2a of the pen core portion 2 is unnecessary. And because this reduces the number of parts that get caught,
There is an advantage that the response of the eccentric movement of the pen core 2A to the writing pressing force can be smoothly performed.

[Seventh Embodiment] Next, a seventh embodiment will be described with reference to FIGS. 18 to 19. The seventh embodiment shown in FIGS. 18 to 19 is the two cut grooves 3 provided in the fourth embodiment (FIGS. 11 to 14) described above.
Two notch grooves 13A and 13B corresponding to A and 3B
Is characterized in that it is formed along an extension line of the same angle having a spread of a constant angle (for example, 40 degrees) when viewed from the central axis of the cylindrical pen body 1.

Reference numerals 13Aa and 13Ba represent through holes for preventing cracks provided in the deep portions of the cut grooves 13A and 13B, respectively. Reference numeral 13 indicates a pen tip guide member, and reference numeral 13Z indicates a strip-shaped tongue piece. The other structure is the same as that of the fourth embodiment (FIGS. 11 to 14).

In this way as well, in addition to having the same effects as the above-described fourth embodiment (in the case of FIGS. 11 to 14), the rear end side of the strip-shaped tongue piece 13Z (upward in FIG. 18). Since the width of (side) can be set wide, there is an advantage that the tip portion can have a more flexible structure.

[Eighth Embodiment] Next, an eighth embodiment will be described with reference to FIGS. The eighth embodiment shown in FIGS. 20 to 21 has two notch grooves 13A and 13B and a through hole 13A formed in the same manner as the case of the seventh embodiment (FIGS. 18 to 19) described above.
a, 13Ba.

Further, the eighth embodiment has an annular pen tip cover piece 14Z similar to the case of the fifth embodiment (FIG. 15) described above, and the second embodiment (FIGS. 6 to 6) described above. As in the case of FIG. 8), the pen core part locking mechanism 11 for locking the pen core part 2 is provided in the pen tip guide member 13 (may be in the pen body 1). .

Further, in the eighth embodiment, a space is provided between the inner diameter side of the tip end portion of the pen tip guide member 13 and the periphery of the tip end portion of the pen core portion 2, whereby the inside of the pen tip guide member 13 is formed. Then, the pen core portion 2 can be freely curved and eccentric. The other structure is the same as that of the fifth embodiment (FIG. 15) described above.

In this way as well, in addition to having the same effects as the case of the above-described seventh embodiment (FIGS. 18 to 19), the pen is similar to the case of the above-described fifth embodiment (FIG. 15). Since it is not necessary to lock the pen core portion 2 in the tip portion of the tip guide member 3, the material and shape of the pen tip guide member 3 can be freely set. There is an advantage that it can correspond to.

[0060]

As described above, according to the present invention, since at least the tip of the pen tip guide member is formed of the elastic soft member, the writing push applied concentratedly to the tip of the pen core during writing is performed. It absorbs pressure moderately,
This can effectively reduce the fatigue accumulated on the user's arm or shoulder, and also suppress the generation of ink spills at the tip of the pen core, thereby improving the quality of ink characters and pen The durability of the tip of the core portion can be improved, and since the shape and structure of the pen tip guide member is simple, mass productivity is high, and thus the pen tip guide member can be obtained at a relatively low cost.

Further, the writing pressure applied to the tip of the pen tip guide member is entirely received by the pen tip cover piece, and the tip end of the strip-shaped tongue piece 3Z is evenly distributed through this pen tip cover piece. Since it is configured to be pushed to, the tip of the pen core will not come apart with time even after repeated use over a long period of time (a state in which it has changed such as bending), and always maintain the initial state. You can

Further, even if the writing portion of the pen core portion is suddenly eccentrically moved by the writing pressure, the pen tip cover piece is in full contact with the pen tip cover piece, so that it can be easily followed, and the pen tip guide Since the eccentricity is allowed only on one side of the tip of the member 3, depending on the application, it is possible to obtain both a soft writing feel and a conventional hard writing feel by reversing the use. it can.

Further, the original position restoring force of the pen core portion is a pressing force due to the synergistic effect of the elastic force of the strip-shaped tongue piece itself and the elastic force between the edge portions of the pen tip guide member forming the cut groove. Since it can be quickly generated as a reaction force against, the followability and writing quality can be improved.

[Brief description of drawings]

FIG. 1 is a partially omitted front view showing a first embodiment of the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is a cross-sectional view taken along the line AA of FIG.

5 is a diagram showing the operation of FIG. 1, and FIG. 5 (A) is an explanatory diagram showing a state of functioning in the same manner as an ordinary ballpoint pen;
(B) is an explanatory view showing a state in which the strip-shaped tongue portion is eccentric according to the writing pressure from the pen core portion side.

FIG. 6 is a partially omitted front view showing a second embodiment.

FIG. 7 is a right side view of FIG.

8 is a sectional view taken along the line AA of FIG.

FIG. 9 is a partially omitted front view showing a third embodiment.

FIG. 10 is a bottom view of FIG.

FIG. 11 is a partially omitted front view showing a fourth embodiment.

FIG. 12 is a bottom view of FIG. 11;

FIG. 13 is a right side view of FIG.

14 is a cross-sectional view taken along the line AA of FIG.

FIG. 15 is a vertical cross-sectional view showing a fifth embodiment with a part omitted.

FIG. 16 is a partially omitted front view showing a sixth embodiment.

FIG. 17 is a sectional view taken along the line AA in FIG. 16;

FIG. 18 is a partially omitted front view showing a seventh embodiment.

19 is a cross-sectional view taken along the line AA of FIG.

FIG. 20 is a partially omitted front view showing an eighth embodiment.

21 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Pen Main Body 2 Pen Core 2A Writing Part 3,13 Pen Tip Guide Member 3Z, 13Z Strip-shaped Tongue Piece 4Z, 14Z, 24Z Pen Tip Cover Piece

Claims (3)

[Claims] 1. A cylindrical pen main body, a pen core which is provided in the pen main body, contains ink therein, has a writing part at the tip, and is formed to be bendable, and a pen core of the pen core. A pen tip guide member attached to a tip portion of the pen body portion corresponding to a writing portion, and a writing portion of the pen core portion attached to a rear end portion of the pen body portion is partially formed from the pen tip guide member. In a ball-point pen having a core rear end holding member that holds the pen core at a rear end while maintaining a protruding state, the pen tip guide member is elastic and has a space in an inner portion around the pen core. The pen tip guide member is provided with at least two notch grooves in a direction along the central axis at predetermined intervals at a part of the tip of the pen tip guide member. Of the strip-shaped tongue piece that is formed by being sandwiched between the grooves The end, ball-point pen, characterized in that, equipped with a nib cover piece liberated from the tip of the pen tip guide member. 2. The ball-point pen according to claim 1, wherein the pen tip cover piece is a pen tip cover piece made of a semi-annular member in alignment with the tip end portion of the pen tip guide member. 3. The ballpoint pen according to claim 1, wherein the pen tip cover piece is a pen tip cover piece formed of an annular member so as to fit to a tip end portion of the pen tip guide member.