JP7277262B2 - writing instrument - Google Patents

Description

TECHNICAL FIELD The present invention relates to a writing instrument having a component with a vent.

2. Description of the Related Art Conventionally, writing implements (for example, ballpoint pens, etc.) are known which include a refill containing ink and a barrel containing the refill. A breech plug for fixing the refill was sometimes attached to the rear end of the barrel.

However, there is a risk of suffocation, especially if an infant accidentally swallows the tail plug and clogs the airway. Therefore, a writing instrument having a tail plug provided with a ventilation hole has been disclosed in order to allow air to flow even if the tail plug clogs the respiratory tract (see Patent Documents 1 and 2).

In the writing instrument described in Patent Document 1, a communicating porous body is provided inside the rear end side of the refill to suppress leakage of ink. However, when an impact is applied with the tail plug facing downward, the ink sometimes flows backward, passes through the communicating porous body, and leaks out from the ventilation hole of the tail plug.

In addition, in the writing instrument described in Patent Document 2, although the breech is provided with a vent hole, the amount of air flowing is such that it is possible to prevent the decompression in the refill. Therefore, it has been difficult to ensure air circulation to the extent that suffocation can be prevented especially when an infant clogs the respiratory tract with the tail plug.

Therefore, a tail plug that prevents backflow of ink and ensures air circulation is disclosed (see Patent Document 3).

JP-A-10-119477 JP 2004-306349 A JP 2012-56129 A

An object of an embodiment of the present invention is to provide a writing instrument that can prevent contents such as ink from leaking out from vent holes of parts even if the contents flow backward.

In still another embodiment, in addition to the above problems, it is also a problem to provide a writing instrument that can be used by exchanging various forms of refills.

In order to solve the above problems, the first embodiment of the present application is
a refill containing ink;
a barrel containing the refill;
A writing instrument comprising a part that abuts on the rear end of the refill and is attached to the rear end of the barrel,
Said parts include:
a cylindrical outer cylinder;
an inner cylindrical portion having a diameter smaller than that of the outer cylindrical portion and coaxially with the outer cylindrical portion, and having a front end edge positioned rearward of the front end edge of the outer cylindrical portion;
a bottom portion that closes the rear end side of the inner cylindrical portion;
a first storage portion, which is a space surrounded by the inner surface of the bottom portion and the inner peripheral surface of the inner cylindrical portion, and stores the content when it flows out from the rear end of the refill;
a plurality of partitions for partitioning the space between the outer tubular portion and the inner tubular portion into a plurality of partitions in the circumferential direction;
a partition wall that closes a portion on the rear end side of the front end of the inner tubular portion in at least some of the plurality of partitions;
a second reservoir, which is a space on the distal end side of the partition in the partition having the partition;
a notch provided in a portion of the front edge of the inner cylindrical portion facing the second storage portion, the ventilation opening connecting the first storage portion and the second storage portion;
is provided, and
It is characterized in that when the contents overflow from the first storage part, the contents can flow into the second storage part through the ventilation port and be stored therein. .

"Writing implements" include, for example, ball-point pens, felt-tip pens, calligraphy pens, and the like. In this writing instrument, the "tip" means the end of the refill on the writing part side. On the other hand, "rear end" means the end opposite to the leading end. In addition, in the present disclosure, the side closer to the "tip" here is referred to as the "tip side", and the opposite side is referred to as the "rear end side".

"Ink" includes, for example, oil-based ink, water-based ink, gel ink, and the like.

A "refill" refers to a replaceable member comprising a cylindrical structure such as an ink containing tube for containing the ink and a writing part attached to the tip of the cylindrical structure. Examples of this refill include a ball-point pen refill having a ball-point pen tip as a writing portion, an ink refill having a felt pen core or a brush pen core as a writing portion, and the like.

A "barrel" refers to a cylindrical member containing the refill.

"Component" refers to a member attached to the rear end of the barrel, such as a so-called breech plug. This component has the following configuration.

The part presents a double tubular structure, an outer "outer cylinder" and an inner "inner cylinder". The inner cylindrical portion has a smaller diameter than the outer cylindrical portion and has the same axial center. Further, the front edge of the inner tubular portion is located rearward from the front edge of the outer tubular portion.

The "bottom part" is a structure that closes the rear end side of the inner cylindrical part.

The "first reservoir" is a space surrounded by the inner surface of the bottom portion and the inner peripheral surface of the inner cylindrical portion. The tip side of the first reservoir faces the rear end of the refill accommodated in the barrel. When the content flows out from the rear end of the refill, the leaked content is stored in the first storage portion. The "contents" simply means the ink, but if there is a substance other than the ink contained in the refill (for example, a follower injected into the rear end of the ink), this "content" may be used. Also includes substances such as

A “partition” is a structure that partitions the space between the outer cylinder part and the inner cylinder part into a plurality of sections in the circumferential direction. In other words, the outer cylinder part and the inner cylinder part are connected by this partition part.

A "partition wall" is a structure that closes off a portion of the inner tubular portion on the rear end side from the front end in at least a portion of the plurality of partitions. That is, the partition is not provided at the front end of the inner cylindrical portion, but may be provided at the rear end, for example, as long as it is located on the rear end side.

In the partition where the partition is provided, the space on the tip side of the partition is the "second reservoir".

Furthermore, a notch is provided in a portion of the front edge of the inner cylindrical portion facing the second reservoir, and this notch is a "ventilation port" that connects the first reservoir and the second reservoir. It has become. Through this ventilation port, the contents overflowing from the first reservoir can flow into and be stored in the second reservoir without flowing out to the vent. Therefore, even if the content overflows from the refill to the extent that it cannot be stored in the first storage portion, it is possible to further store the content in the second storage portion. The possibility of leakage to the outside is to be further reduced.

Further, in the second embodiment of the present application, in addition to the features of the first embodiment, the parts include a first contact portion that is the front edge of the partition portion and an inner circumference of the inner cylindrical portion. A second contact portion, which is a step portion formed from the tip side, is further provided,
Any of a plurality of refills formed in different shapes can be incorporated in the barrel.

That is, the front edge of the partition serves as a "first contact portion". A "second contact portion" is formed on the inner periphery of the inner cylindrical portion on the rear end side of the first contact portion and is a stepped portion when viewed from the front end side. In other words, the diameter of the inscribed circle on the rear end side is smaller than the diameter of the inscribed circle on the front end side with respect to the second contact portion. Also, the diameter of the inscribed circle of the first contact portion is larger than the diameter of the inscribed circle of the second contact portion.

As described above, a thicker refill can be brought into contact with the first contact portion, and a thinner refill can be brought into contact with the second contact portion. Therefore, it is possible to incorporate refills having a plurality of types, at least two types of thickness, in the barrel.

In addition to the features of the first or second embodiment, a third embodiment of the present application is characterized in that some of the plurality of sections are not provided with the partition wall and extend from the front end side to the rear end side. It is characterized by being a penetrating ventilation part.

That is, the "ventilation part" is a part of the plurality of compartments partitioned by the partition part and penetrates from the front end side to the rear end side. In other words, there is no structure that blocks the flow from the front end side to the rear end in this ventilation section. In addition, the opening portion on the rear end side of the ventilation portion in the component is referred to as a ventilation hole. As a result, it is possible to flow through the inside of the component from the ventilation hole to the opening portion on the distal end side of the outer cylindrical portion. Therefore, the airway is ensured by this ventilation part even when the part is accidentally swallowed.

In addition, among the plurality of compartments, in the compartments other than the ventilation part, the structure that closes the rear end side of the front end of the inner cylindrical part is the above-described "partition wall". That is, the partition is not provided at the front end of the inner cylindrical portion, but may be provided at the rear end, for example, as long as it is located on the rear end side.

Furthermore, in a fourth embodiment of the present application, in addition to the features of any one of the first to third embodiments, the barrel is made of a material whose interior is visible,
A decoration member is inserted into the inside of the barrel on the tip side thereof to hold the outer diameter of the tip side of the refill.

For example, by applying various costumes to the decorative member, a decorative effect can be achieved. Furthermore, by coloring this decorative member in the same color or similar color to the color of the ink contained in the refill, the decorative member can be visually recognized through the barrel, so that it can be used to indicate the ink color. can do.

A fifth embodiment of the present application provides a plurality of refills having different shapes and containing ink,
a barrel capable of incorporating any of the plurality of refills;
A writing instrument set comprising
A component is attached to the rear end of the barrel, and contacts the rear end of the refill when the refill is incorporated in the barrel,
Said parts include:
a cylindrical outer cylinder;
an inner cylindrical portion having a diameter smaller than that of the outer cylindrical portion and coaxially with the outer cylindrical portion, and having a front end edge positioned rearward of the front end edge of the outer cylindrical portion;
a bottom portion that closes the rear end side of the inner cylindrical portion;
a first storage portion, which is a space surrounded by the inner surface of the bottom portion and the inner peripheral surface of the inner cylindrical portion, and stores the content when it flows out from the rear end of the refill;
a plurality of partitions for partitioning the space between the outer tubular portion and the inner tubular portion into a plurality of partitions in the circumferential direction;
a first contact portion that is a front edge of the partition;
a second contact portion that is a stepped portion from the tip side formed on the inner periphery of the inner cylindrical portion;
a partition wall that closes a portion on the rear end side of the front end of the inner tubular portion in at least some of the plurality of partitions;
a second reservoir, which is a space on the distal end side of the partition in the partition having the partition;
a notch provided in a portion of the front edge of the inner cylindrical portion facing the second storage portion, the ventilation opening connecting the first storage portion and the second storage portion;
is provided, and
It is characterized in that when the contents overflow from the first storage part, the contents can flow into the second storage part through the ventilation port and be stored therein. .

That is, the writing instrument set of this embodiment is one in which the writing instrument is formed by combining any one of the plurality of refills with the barrel.

The significance of each configuration in this embodiment is the same as that of each configuration in the first and second embodiments.

This writing instrument set can be formed as a product including, for example, the plurality of refills and the barrel.

In addition to the features of the fifth embodiment, the sixth embodiment of the present application is characterized in that some of the plurality of sections are not provided with the partition wall and are vented through from the front end side to the rear end side. It is characterized by being a part.

The significance of this vent is as described in the third embodiment.

In a seventh embodiment of the present application, in addition to the features of the fifth or sixth embodiment, the shaft cylinder is made of a material whose interior is visible,
A decoration member is inserted into the inside of the barrel on the tip side thereof to hold the outer diameter of the tip side of the refill.

The significance of each configuration in this embodiment is the same as that of each configuration in the fourth embodiment.

An eighth embodiment of the present application is characterized in that, in addition to the features of any one of the fifth to seventh embodiments, the barrel is a barrel for a knock-type writing instrument having a knock button at the rear end. characterized by

That is, the barrel that constitutes the writing instrument set may be a barrel for a writing instrument with a detachable cap. It is supposed to have a shaft cylinder of

Since each embodiment of the present application is configured as described above, it has the following effects.

That is, according to the first embodiment, the content flowing out from the rear end of the refill is stored in the first storage section. As a result, even if the content flows backward, it can be prevented from leaking out from the ventilation section.

Further, the ink overflowing from the first reservoir flows into the second reservoir through the ventilation opening and is stored therein, and does not flow out to the ventilation section. As a result, even if the ink overflows from the first storage portion, it is possible to prevent the ink from leaking out from the ventilation portion.

Further, according to the second embodiment, in addition to the effects of the first embodiment, refills having a plurality of shapes can be accommodated in the barrel.

Furthermore, according to the third embodiment, in addition to the effects of the first or second embodiment, air is circulated inside the component by the ventilation section. As a result, especially when an infant clogs the airway with the parts, it is possible to secure the airway and prevent suffocation.

According to the fourth embodiment, in addition to the effects of any one of the first to third embodiments, the decorative member provides various design effects and the color of the ink contained in the refill. Display effect can be exhibited.

Also, according to the fifth embodiment,
The content flowing out from the rear end of the refill is stored in the first storage section. As a result, even if the content flows backward, it can be prevented from leaking out from the ventilation section.

Further, the ink overflowing from the first reservoir flows into the second reservoir through the ventilation opening and is stored therein, and does not flow out to the ventilation section. As a result, even if the ink overflows from the first storage portion, it is possible to prevent the ink from leaking out from the ventilation portion.

Also, refills of a plurality of shapes can be accommodated in the barrel.

Furthermore, according to the sixth embodiment, in addition to the effects of the fifth embodiment, air is circulated inside the component by the ventilation section. As a result, especially when an infant clogs the airway with the parts, it is possible to secure the airway and prevent suffocation.

According to the seventh embodiment, in addition to the effects of the fifth or sixth embodiment, the decorative member exhibits various design effects and an effect of displaying the color of the ink contained in the refill. can be made

Further, according to the eighth embodiment, it is possible to obtain the effect of any one of the fifth to seventh embodiments even in a knock-type writing instrument.

1A and 1B are a side view (A) and a side sectional view (B) of a writing instrument according to a first embodiment; FIG. 2A and 2B are a side view (A) and a side sectional view (B) of a refill in the writing instrument of FIG. 1; FIG. 1. It is the side view (A) and side sectional drawing (B) of the barrel in the writing instrument of FIG. The decorative member in the writing instrument of FIG. 1 is shown in a perspective view (A), a side sectional view (B) and a bottom view (C). Figure 2 is a side view of a component in the writing instrument of Figure 1; Figure 6 is a plan view of the part of Figure 5; Figure 6 is a bottom view of the component of Figure 5; The parts in FIG. 5 are shown in the VIII-VIII section in FIGS. 6 and 7. FIG. The parts in FIG. 5 are shown in the IX-IX section in FIGS. 6 and 7. FIG. FIG. 7 is a perspective view of the parts of FIG. 5, showing a partial cross-section along XX in FIGS. 6 and 7; 2 is a side cross-sectional view of the rear end portion of the writing instrument of FIG. 1; FIG. 2 is a perspective cross-sectional view of the rear end portion of the writing instrument of FIG. 1; FIG. It is the side view (A) and side sectional drawing (B) of the writing instrument which concerns on 2nd Embodiment. FIG. 14 is a side view (A) and a side sectional view (B) of a refill in the writing instrument of FIG. 13; 14 is a side cross-sectional view of the latter half of the writing instrument of FIG. 13; FIG. It is a front view of a writing instrument set according to a third embodiment. It is the side view (A) and side sectional drawing (B) of the writing instrument which concerns on 4th Embodiment. It is the side view (A) and side sectional drawing (B) of the writing instrument which concerns on 5th Embodiment. Figure 19 is a side view (A), a front perspective view (B) and a rear perspective view (C) of parts of the writing instrument of Figures 17 and 18; Figure 20 is a bottom view of the part of Figure 19; The parts in FIG. 19 are shown in the XXI-XXI cross section in FIG. The parts in FIG. 19 are shown in the XXII-XXII section in FIG.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings. Of the symbols shown in each drawing, those that are common to a plurality of drawings have the same technical significance even if they are not described in the following description of each drawing. In addition, in the drawing shown as a side view, the left side of the drawing is the plane side and the leading end side, and the right side of the drawing is the bottom side and the rear end side.

(First embodiment)
<Appearance>
FIG. 1A is a side view of the writing instrument 10 according to the first embodiment. As shown in this figure, the writing instrument 10 of this embodiment is configured as a ballpoint pen. The writing instrument 10 has an appearance in which a cap 36 having a clip 37 is attached to the tip of a barrel 30 having a part 40 as a tail plug attached to the rear end.

FIG. 1B is a side sectional view of the writing instrument 10. FIG. As shown in the figure, in the writing instrument 10 of the present embodiment, a refill 20 containing ink 24 is built in the barrel 30, and the rear end of the refill 20 is in contact with the component 40. Supported. A ball-point pen tip 21 is attached via a joint 22 to the tip of an ink containing tube 23 containing the ink 24 in the refill 20 . A resin ball 26 is attached to the tip of the ball-point pen tip 21 . The resin ball 26 is attached for the purpose of protecting the tip of the ball-point pen tip 21, and is removed before the refill 20 is used. Furthermore, a grease-like follower 25 is injected into the rear end of the ink 24 contained in the refill 20 . A decorative member 70 is inserted between the distal end side of the refill 20 and the inner surface of the shaft tube 30 on the distal end side, which will be described later.

<Refill 20>
FIG. 2A is a side view of the refill 20 in the writing instrument 10. FIG. As described above, the refill 20 has the appearance of a metal ball-point pen tip 21 attached to the tip of a cylindrical synthetic resin ink container tube 23 via a synthetic resin joint 22 .

FIG. 2B is a side sectional view of the refill 20 in the writing instrument 10. FIG. As described above, the ink containing tube 23 contains the ink 24 as described above. The ink 24 of this embodiment is an aqueous gel ink. In addition to this ink 24, a grease-like follower 25 is injected into the rear end. In this follower 25, a columnar float made of synthetic resin adjusted to have the same specific gravity may be floated.

<Axle cylinder 30>
FIG. 3A is a side view of the barrel 30 in the writing instrument. The shaft tube 30 is formed in a cylindrical shape by using a synthetic resin whose inside can be visually recognized. The distal end portion of the shaft cylinder 30 has a tapered portion 31 in which the outer diameter is once reduced, and the outer periphery is further tapered down at the tip.

FIG. 3B is a side sectional view of the barrel 30. As shown in FIG. An opening 35 is formed at the tip of the tapered portion 31, through which the ball-point pen tip 21 of the refill 20 protrudes (see FIG. 1(B)). Also, the cap 36 is detachably attached so as to cover the tapered portion 31 of the barrel 30 (see FIGS. 1A and 1B).

Further, as shown in FIG. 3B, the rear end portion of the barrel 30 is formed with a stepped concave portion 33 whose inner periphery is stepwise expanded toward the rear end. A female screw groove 34 for screwing the component 40 is formed in the rear end portion of the stepped recess 33 . On the other hand, a locking projection 32 protruding inward is formed on the inner peripheral surface of the tip portion of the barrel.

<Decorative member 70>
FIG. 4A is a perspective view showing the appearance of the decorative member 70. FIG. The decorative member 70 is made of a synthetic resin colored in the same color or similar to the color of the ink 24, and has a substantially cylindrical rear portion 72 and a front portion 71 having a tapered outer circumference and a reduced diameter. It has a formed appearance. A vibration-damping ridge 73 is formed on the outer periphery of the rear portion 72 and protrudes in an annular shape to prevent vibration with the shaft cylinder 30 . Further, a locking projection 78 is formed on the rear end side of the damping projection 73 and at the rear end of the outer periphery of the rear portion 72 . When the locking projection 78 is attached to the barrel 30, the locking projection 78 is located on the distal end side so as to overcome the locking projection 32 by elastic deformation. 78 are to be locked with each other. A front opening 74 is formed at the tip of the front portion 71 .

FIG. 4B is a side sectional view of the decorative member 70. As shown in FIG. 4C is a bottom view of the decorative member 70. FIG. As shown in these figures, the inner peripheral surface of the ornamental member 70 has a diameter-reduced stepped portion 75 whose diameter is reduced in a stepped manner at the tip side thereof, from which the front opening 74 as a hole of a smaller diameter is formed. formed. The ball-point pen tip 21 of the refill 20 passes through the front opening 74 (see FIG. 1(B)). The rear end of the rear portion 72 forms a rear opening 76 having a larger diameter than the front opening 74 . Furthermore, on the inner peripheral surface of the decorative member 70, six inner ribs 77 along the longitudinal direction protrude inward so as to be evenly distributed with respect to the axis. These inner ribs 77 support the outer circumference of the joint 22 of the refill 20 (see FIG. 1(B)).

With the above configuration, the decorative member 70 has the function of holding the outer diameter of the tip portion of the refill 20, and is colored in the same color as or similar to the color of the ink 24 as described above. It also has a function of displaying the color of the ink 24 contained in 20 .

<Part 40>
FIG. 5 is a side view of the component 40 of the writing instrument 10. FIG. As shown in this figure, in the component 40, an outer cylindrical portion 50 having a substantially cylindrical appearance when viewed from the side is visible. Six convex portions 53 are evenly distributed along the longitudinal direction and protrude from the outer peripheral surface of the rear end side of the outer cylindrical portion 50 . In addition, the outer peripheral surface of the distal end of the outer cylinder portion is formed to have a slightly smaller diameter, and when this portion is mounted on the shaft cylinder 30, it is fitted into the stepped recess 33 (see FIG. 3B). A portion 52 is formed. A male screw groove 51 for screwing with the female screw groove 34 is formed in the rear side portion of the fitting portion 52 .

6 is a plan view of the component 40. FIG. 7 is a bottom view of the component 40. FIG. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIGS. 6 and 7. FIG. FIG. 9 is a sectional view taken along line IX-IX in FIGS. 6 and 7. FIG. 10 is a perspective view of the component 40, showing a partial cross-section taken along line XX in FIGS. 6 and 7. As shown in FIG.

As shown in FIGS. 6 to 10, the component 40 includes a cylindrical outer cylinder portion 50 having a larger diameter and a cylindrical inner cylinder portion 60 having a smaller diameter and accommodated in the outer cylinder portion 50. have. More specifically, the inner tubular portion 60 is coaxially positioned in the outer tubular portion 50 (see FIGS. 6 and 7). The open front end of the inner cylinder portion 60 is located closer to the rear end than the open front end of the outer cylinder portion 50 (see FIGS. 8 to 10). Further, the rear end side of the inner cylindrical portion 60 is closed by a bottom portion 41 (see FIGS. 7 to 10). The bottom portion 41 can also be visually recognized from the tip side (see FIG. 6).

In addition, the bottom portion 41 can also be regarded as the rear end side surface of the outer cylindrical portion 50 . That is, the bottom portion 41 of the outer cylinder portion 50 is provided with several openings (vent holes 44 (see FIG. 7) described later) to block at least the rear end side of the inner cylinder portion 60. , can also be said. In this way, the bottom portion 41 is a portion that closes at least the center portion of the mouth of the rear end side of the outer cylinder portion 50, and has a cylindrical shape that protrudes from the inner surface of the center portion of the bottom portion 41 toward the tip side. It can also be said that the structure of is the inner cylindrical portion 60 . A space surrounded by the inner surface of the bottom portion and the inner peripheral surface of the inner cylindrical portion 60 is referred to as a first storage portion 61 (see FIGS. 8 to 10).

The outer tubular portion 50 and the inner tubular portion 60 are connected along the longitudinal direction by six equally distributed partitions 42 (see FIGS. 6 and 7). These partitions 42 partition the space between the outer cylinder part 50 and the inner cylinder part 60 into six sections in the circumferential direction.

Some of these six compartments, specifically four, are completely penetrating from the leading end to the trailing end (see FIG. 9). These four compartments are referred to as vents 43 (see Figures 6 and 7). The rear edges of these vents 43 can be recognized as holes when viewed from the bottom (see FIG. 7). These holes are referred to as vent holes 44 . The ventilation part 53 allows air to flow through the inside of the part 40 from the ventilation hole 44 to the tip end side of the outer tube part 50. block the airway, prevent suffocation.

In addition, in the remaining two compartments other than the ventilation part 43 among the six compartments, the part on the rear end side from the front end of the inner cylinder part 60 is blocked by the partition wall 46 (FIGS. 6 and 7). 7). In these two compartments, the space on the distal end side of the partition wall 46 is called a second reservoir 45 (see FIG. 10). A notch is provided in a portion of the front edge of the inner cylindrical portion 60 facing the second storage portion 45 . This notch is a ventilation port 62 that connects the first reservoir 61 and the second reservoir 45 . When the ink 24 in the refill 20 is reduced by writing, external air flows into the ink storage tube 23 through the ventilation port 62 .

A tip surface of the partition portion 42 is called a first contact portion 47 . Six front ribs 54 projecting inward extend from the first contact portion 47 in the distal direction (see FIGS. 8 to 10). These six front ribs 54 are portions that abut on the outer circumference of the rear end portion of the refill 20 .

In addition, six rear ribs 64 protrude along the longitudinal direction on the inner peripheral surface of the portion on the rear end side of the first storage portion 61 (see FIG. 10). is referred to as a second contact portion 63 (see FIGS. 6 and 10). In other words, the second contact portion 63 is formed on the inner circumference of the inner cylindrical portion 60 on the rear end side of the first contact portion 47 and is a stepped portion when viewed from the front end side. . That is, the diameter of the inscribed circle on the rear end side is smaller than the diameter of the inscribed circle on the tip side with respect to the second contact portion 63 . Also, the diameter of the inscribed circle of the first contact portion 47 is larger than the diameter of the inscribed circle of the second contact portion 63 .

The component 40 has the structure described above integrally formed of synthetic resin.

<Mounting of component 40>
In this embodiment, the decorative member 70 shown in FIGS. 4(A) to 4(C) is attached to the barrel 30 shown in FIGS. 3(A) and 3(B). Next, the refill 20 shown in FIGS. 2(A) and 2(B) is attached from the rear end of the barrel 30 . Then, the male thread groove 51 of the component 40 shown in FIGS. In this manner, the component 40 is attached to the barrel 30, as shown in FIG. 11, which is a side sectional view of the rear end portion of the writing instrument 10. In this state, the rear end of the ink containing tube 23 is supported by the component 40 while being in contact with the first contact portion 47 . It should be noted that the tolerance of the entire length of the refill 20 can be adjusted by adjusting how the part 40 is screwed into the barrel 30 .

FIG. 12 is a perspective cross-sectional view of the rear end portion of the writing instrument 10. As shown in FIG. As described above, the first contact portion 47 contacts the rear edge of the ink containing tube 23 . The space surrounded by the inner surface of the bottom portion 41 and the inner peripheral surface of the inner cylindrical portion 60 serves as the first storage portion 61 as described above. In the first storage section 61, when the contents such as the follower 25 and the ink 24 flow out from the rear end of the ink storage tube 23, they can be stored. . In addition, between the first contact portion 47 and the rear edge of the ink containing tube 23, there may be a degree of play that prevents the content from exuding due to surface tension.

Further, the front rib 54 and the outer periphery of the rear end portion of the refill 20 may be formed so as to have a degree of play that prevents the contents from leaking out due to surface tension. That is, the rear end portion of the refill 20 may be loosely fitted inside the six front ribs 54 when the component 40 is attached to the rear end of the barrel 30 .

The method of fixing the component 40 is not limited to screwing as described above. For example, instead of the male thread groove 51 and the female thread groove 34, projections are provided on the outer circumference of the outer cylindrical portion 50 and the inner circumference of the shaft cylinder 30, respectively, and the component 40 is formed by engaging the projections with each other. may be fixed. Alternatively, instead of the male thread groove 51 and the female thread groove 34, either the outer circumference of the outer cylinder portion 50 or the inner circumference of the shaft cylinder 30 is provided with a projection and the other is provided with a groove, and the groove is provided with a groove. The component 40 may be fixed by fitting the protrusions. Alternatively, the part 40 may be adhered and fixed to the barrel 30 with an adhesive, or the part 40 and the barrel 30 may be welded and fixed using a laser or the like. Alternatively, the front rib 54 may be formed to press against the outer circumference of the rear end portion of the refill 20 . That is, when attaching the component 40 to the rear end of the barrel 30, the component 40 is attached so that the rear end portion of the refill 20 is press-fitted inside the six front ribs 54. may be

<Backflow of contents>
The reverse flow of contents such as the ink 24 and the follower 25 contained in the ink containing tube 23 will be described with reference to FIG. If the writing instrument 10 is impacted or left for a long time with the ballpoint pen tip 21 facing upward, the contents of the ink containing tube 23 may flow back toward the component 40 . The content that has flowed back in this manner flows into the inner cylindrical portion 60 and is stored in the first storage portion 61 .

When the content continues to flow into the first storage portion 61 and the content stored in the first storage portion 61 overflows up to the ventilation port 62 of the inner cylindrical portion 60, the content is discharged through this ventilation. It flows into the second reservoir 45 through the port 62 . The content that has flowed into the second storage section 45 is blocked by the partition section 42 and does not flow out to the adjacent ventilation section 43 , and continues to be stored in the second storage section 45 . In this way, even if the content flows backward, it can be prevented from leaking out from the vent hole 44 of the component 40 .

(Second embodiment)
<Appearance>
FIG. 13A is a side view of the writing instrument 10 according to the second embodiment. As shown in this figure, the writing instrument 10 of this embodiment is configured as a ballpoint pen. The writing instrument 10 has an appearance in which a cap 36 having a clip 37 is attached to the tip of a barrel 30 having a part 40 as a tail plug attached to the rear end.

FIG. 13B is a side sectional view of the writing instrument 10. FIG. As shown in the figure, in the writing instrument 10 of the present embodiment, a refill 20 containing ink 24 is built in the barrel 30, and the rear end of the refill 20 is in contact with the component 40. Supported. A ball-point pen tip 21 is attached to the tip of an ink containing tube 23 containing the ink 24 in the refill 20 . A resin ball 26 is attached to the tip of the ball-point pen tip 21 . The resin ball 26 is attached for the purpose of protecting the tip of the ball-point pen tip 21, and is removed before the refill 20 is used. A decorative member 70 is inserted between the tip side of the refill 20 and the inner surface of the barrel 30 on the tip side, which is the same as in the first embodiment (FIG. 4A). ) to FIG. 4(C)).

<Refill 20>
FIG. 14A is a side view of the refill 20 in the writing instrument 10. FIG. As described above, the refill 20 has an appearance in which the ball-point pen tip 21 made of metal is attached to the tip of the columnar ink storage tube 23 made of synthetic resin.

FIG. 14B is a side sectional view of the refill 20 of the writing instrument 10. FIG. As described above, the ink containing tube 23 contains the ink 24 as described above. The ink 24 of this embodiment is an oil-based ink. The ink containing tube 23 in this embodiment has a smaller diameter than the ink containing tube 23 in the first embodiment (see FIGS. 2A and 2B).

<Axle cylinder 30>
The shaft cylinder 30 is the same as in the first embodiment (see FIGS. 3A and 3B).

<Part 40>
The parts 40 are the same as those of the first embodiment (see FIGS. 5 to 10).

<Mounting of component 40>
In this embodiment, first, the decorative member 70 (FIGS. 4A to 4C) is attached to the barrel 30 (see FIGS. 3A and 3B). Next, the refill 20 shown in FIGS. 14(A) and 14(B) is attached from the rear end of the barrel 30 . Then, the male thread groove 51 of the component 40 is screwed into the female thread groove 34 at the rear end of the shaft cylinder 30 . In this manner, the component 40 is attached to the barrel 30, as shown in FIG. 15, which is a side sectional view of the rear end portion of the writing instrument 10. In this state, the rear end of the ink containing tube 23 is supported by the component 40 while being in contact with the second contact portion 63 . It should be noted that the tolerance of the entire length of the refill 20 can be adjusted by adjusting how the part 40 is screwed into the barrel 30 .

(Overview of the first and second embodiments)
As described above, the shaft tube 30, the ornamental member 70, and the component 40 have structures common to the first embodiment and the second embodiment. With this common structure, the refills 20 having different shapes, such as the refills 20 having a relatively large diameter as in the first embodiment and the refills 20 having a relatively small diameter as in the second embodiment. , 20 can be incorporated. In any case of the refill 20, the length tolerance can be finely adjusted by adjusting how the part 40 is screwed into the barrel 30. As shown in FIG.

(Writing instrument set 80)
FIG. 16 is a front view of a writing instrument set 80 according to the third embodiment. In this writing instrument set 80, the barrel 30 to which the cap 36 having the part 40 and the clip 37 is mounted, and the refills 20, 20 in the first and second embodiments are transparent. It is enclosed in a package 81 made of resin. Each refill 20, 20 has a different ink type, or a different ink viscosity or ink color. However, since each refill 20, 20 contains an amount of ink such that the writable distances are substantially equal, when the frequency of use of each refill 20, 20 is substantially equal, only one refill is used up first. Things become less likely to happen, and user convenience improves. Note that different types of inks refer to inks that use different main solvents, such as so-called oil-based inks, water-based inks, and emulsion inks.

At the time of use, the barrel 30 and the refills 20, 20 are removed from the packaging 81, the component 40 is removed from the barrel 30, and one of the refills 20, 20 is placed in the Insert into barrel 30 and attach component 40 as previously described. Thereby, the writing instrument 10 according to the first embodiment (see FIGS. 1A and 1B) or the writing instrument 10 according to the second embodiment (see FIGS. 13A and 13B) is formed.

(Fourth embodiment)
<Appearance>
FIG. 17A is a side view of the writing instrument 10 according to the fourth embodiment. As shown in the figure, the writing instrument 10 of this embodiment is configured as a so-called knock type writing instrument in which a knock cover 39 as a knock button protrudes from the rear end of the barrel 30 . A clip 37 is integrally formed on the rear end side surface of the barrel 30 of the writing instrument 10 . A front barrel 30A having a tapered portion 31 whose outer circumference is tapered is attached to the tip of the barrel 30. As shown in FIG.

FIG. 17(B) is a side sectional view of the writing instrument 10 of FIG. 17(A). As shown in the figure, in the writing instrument 10 of the present embodiment, a refill 20 containing ink 24 is built in the barrel 30, and a part 40 as a rotor is provided at the rear end of the refill 20. is installed. This ink 24 is water-based gel ink, and a grease-like follower 25 is injected into the rear end of the ink 24 in the ink containing tube 23 . In this embodiment, the rear end of the refill 20 is held by the outer cylindrical portion 50 forming the tip side of the component 40 . Further, the rear end of this part 40 is provided with a knock bar 38 for retracting the refill 20 and a knock cover 39 fitted to the knock bar 38 as a color and function display member. The length and outer diameter of the ink storage tube 23 in this refill 20 are the same as those of the refill 20 in the first embodiment (see FIGS. 2A and 2B), and the parts constituting the refill 20 are also the same as those described above. This is the same as the first embodiment.

The rear portion of the front barrel 30A is screwed into and fixed to the inner peripheral surface of the distal end of the barrel 30, and the front portion is the tapered portion 31 described above. An opening 35 is formed at the tip of this tapered portion 31, and the ball-point pen tip 21 of the refill 20 appears and disappears therefrom as the knock cover 39 is operated. In this embodiment, a knock spring 27 is interposed between the joint 22 of the refill 20 (see FIG. 2(B)) and the step formed slightly behind the opening 35 of the front barrel 30A. It is

An elastic ring-shaped decoration member 70 is inserted between the tip side of the refill 20 and the inner surface of the tip side of the barrel 30, and functions as a vibration stop inside the barrel 30 of the refill 20. .

(Fifth embodiment)
<Appearance>
FIG. 18(A) is a side view of the writing instrument 10 according to the fifth embodiment. As shown in the figure, the writing instrument 10 of this embodiment is configured as a so-called knock type writing instrument in which a knock cover 39 as a knock button protrudes from the rear end of the barrel 30 . A clip 37 is integrally formed on the rear end side surface of the barrel 30 of the writing instrument 10 . A front barrel 30A having a tapered portion 31 whose outer circumference is tapered is attached to the tip of the barrel 30. As shown in FIG.

FIG. 18(B) is a side sectional view of the writing instrument 10 of FIG. 18(A). In the writing instrument 10 of the present embodiment, a refill 20 having substantially the same structure as the refill 20 (see FIGS. 14A and 14B) in the second embodiment is attached. The structures of the shaft 30A, the part 40 as the rotor, the knock rod 38 and the knock cover 39 are the same as those of the fourth embodiment. The ink 24 contained in this refill 20 is oil ink. Note that, in this embodiment, the rear end of the refill 20 is held by the inner tubular portion 60 forming the rear side of the component 40 . Further, in this embodiment, a raised portion 23A formed to protrude outward near the tip of the ink containing tube 23 of the refill 20, and a stepped portion formed slightly behind the opening 35 of the front barrel 30A. A knock spring 27 is interposed between them.

An elastic plate-shaped ring-shaped decorative member 70 is inserted between the distal end side of the refill 20 and the inner surface of the barrel 30 on the distal end side. The outer diameter of the decoration member 70 is formed larger than the inner diameter of the barrel 30, and when the refill 20 is inserted into the barrel 30, the outer circumference side is bent in the axial direction, so that the refill 20 can be removed. It functions as a vibration stop inside the barrel 30 .

(part 40)
The component 40 as the rotor described above is common to the fourth embodiment and the fifth embodiment. 19(A) is a side view of the component 40, FIG. 19(B) is its front perspective view, and FIG. 19(C) is its rear perspective view. As shown in these figures, the front portion of the component 40 is an outer cylindrical portion 50 that has a substantially cylindrical appearance when viewed from the side. Further, behind the outer cylindrical portion 50, an inner cylindrical portion 60 having a smaller diameter than the outer cylindrical portion 50 and having the same axial center is integrally formed. A front edge 68 of the inner tubular portion 60 projects slightly forward from the bottom surface of the outer tubular portion 50, as shown in FIG. 19(B). From the rear end of the inner cylindrical portion 60, a substantially cylindrical connecting projection 67 having a smaller diameter projects. This connection projection 67 is a part involved in connection with the knock rod 38 positioned at the rear as shown in FIGS. 17(B) and 18(B). In addition, side ribs 65 are formed along the longitudinal direction on the outer side surface of the inner cylindrical portion 60 so as to be evenly distributed in three directions (see FIG. 19(C)). The rear end surface of the side rib 65 constitutes a cam tooth 66 that participates in a cam operation together with the rear end surface of the inner cylindrical portion 60 and the knock rod 38 located behind.

20 is a plan view of the component 40. FIG. 21 is a cross-sectional view taken along line XXI-XXI in FIG. 20. FIG. 22 is a cross-sectional view taken along line XIII-XIII in FIG. 20. FIG.

As shown in FIGS. 20-22, the component 40 consists of a larger diameter cylindrical outer tube portion 50 and a large portion of the outer tube portion 50 located behind the outer tube portion 50, and only a front edge 68 portion. is positioned inside the outer tubular portion 50 and has a smaller diameter tubular inner tubular portion 60 . The inner tubular portion 60 is coaxial with the outer tubular portion 50 (see FIG. 20). The open front end of the inner cylinder portion 60 is located closer to the rear end than the open front end of the outer cylinder portion 50 (see FIG. 21). Further, the rear end side of the inner cylindrical portion 60 is closed by a bottom portion 41 (see FIGS. 20 to 22). The bottom portion 41 can also be visually recognized from the tip side (see FIG. 20). From the rear end of the inner cylindrical portion 60, the connection projection 67 is projected.

A space surrounded by the inner surface of the bottom portion and the inner peripheral surface of the inner cylindrical portion 60 is referred to as a first storage portion 61 (see FIGS. 20 to 22).

The inner surface of the outer tubular portion 50 and the front edge 68 of the inner tubular portion 60 are connected by six partitions 42 (see FIG. 20) that are evenly distributed. These partitions 42 partition the space between the outer cylinder part 50 and the inner cylinder part 60 into six sections in the circumferential direction.

These six compartments are closed by a partition wall 46 at the rear end side of the front edge 68 of the inner cylindrical portion 60 (see FIGS. 20 and 21). These six compartments blocked by the partition wall 46 are called a second reservoir 45 (see FIGS. 20 and 21). Of these six sections, two sections facing each other across the axial center are provided with notches in the front edge 68 of the inner cylindrical portion 60 . This notch is a ventilation port 62 that connects the first reservoir 61 and the second reservoir 45 . When the ink 24 in the refill 20 is reduced by writing, external air flows into the ink storage tube 23 through the ventilation port 62 .

A tip surface of the partition portion 42 is called a first contact portion 47 . Six front ribs 54 projecting inward extend from the first contact portion 47 in the distal direction (see FIGS. 20 to 22). These six front ribs 54 are portions that abut on the outer circumference of the rear end portion of the refill 20 .

In addition, six rear ribs 64 protrude along the longitudinal direction on the inner peripheral surface of the portion on the rear end side of the first storage portion 61 (see FIGS. 20 to 22). is referred to as a second contact portion 63 (see FIGS. 20 to 22). In other words, the second contact portion 63 is formed on the inner circumference of the inner cylindrical portion 60 on the rear end side of the first contact portion 47 and is a stepped portion when viewed from the front end side. . That is, the diameter of the inscribed circle on the rear end side is smaller than the diameter of the inscribed circle on the front end side with respect to the second contact portion 63 . Also, the diameter of the inscribed circle of the first contact portion 47 is larger than the diameter of the inscribed circle of the second contact portion 63 .

The component 40 has the structure described above integrally formed of synthetic resin.

<Mounting of component 40>
In this embodiment, the knock rod 38 (see FIGS. 17 and 18) is inserted into the connection projection 67 of the component 40 and inserted rearward from the front end of the barrel 30 . A knock cover 39 is attached to the knock rod 38 projecting from the rear end of the barrel 30 as shown in FIGS.

Then, in the fourth embodiment, after the decorative member 70 (see FIG. 17(B)) is extrapolated to the refill 20 having a larger diameter (see FIGS. 2(A) and 2(B)), the refill 20 is is inserted from the tip of the barrel 30 . The rear end of the refill 20 enters the outer cylindrical portion 50 of the component 40 and is held in contact with the first contact portion 47 (see FIG. 17(B)). At this time, the decorative member 70 is sandwiched between the outer side surface of the refill 20 and the inner side surface of the barrel 30 , thereby functioning as a vibration restraint for the refill 20 . In this state, after the knock spring 27 is externally fitted to the tip of the refill 20, the front barrel 30A is screwed to the tip of the barrel 30 to form the writing instrument 10 shown in FIGS. 17(A) and 17(B). .

On the other hand, in the fifth embodiment, the refill 20 (see FIGS. 14A and 14B) is fitted with the decoration member 70 (see FIG. 18B), and then the refill 20 is is inserted from the tip of the barrel 30 . The rear end of the refill 20 passes through the outer cylindrical portion 50 of the component 40, enters the inner cylindrical portion 60, and is held in contact with the second contact portion 63 (see FIG. 18B). At this time, the decorative member 70 is sandwiched between the outer side surface of the refill 20 and the inner side surface of the barrel 30 , thereby functioning as a vibration restraint for the refill 20 . In this state, the knock spring 27 is externally fitted to the tip of the refill 20, and then the front barrel 30A is screwed to the tip of the barrel 30 to form the writing instrument 10 shown in FIGS. 18(A) and 18(B). .

<Summary of Fourth Embodiment and Fifth Embodiment>
As described above, the component 40 can also be used for the refill 20 (see FIGS. 2A and 2B) that accommodates a larger diameter water-based gel ink and a smaller diameter refill that accommodates an oily ink. (See FIGS. 14A and 14B). Therefore, refills 20 of at least two different thicknesses can be attached to the same barrel 30 to which the same part 40, knock rod 38, knock cover 39 and front barrel 30A are attached. The reverse flow of contents such as the ink 24 and the follower 25 contained in the ink containing tube 23 is as described in the first embodiment.

Further, the barrel 30 (together with the component 40, the knock rod 38, the knock cover 39 and the front barrel 30A) in the fourth and fifth embodiments is added to the writing instrument set 80 described in the third embodiment. It may be included in the packaging 81 instead of or together with the barrel 30 in the embodiment.

INDUSTRIAL APPLICABILITY The present invention can be used for writing implements such as ballpoint pens, felt pens or marking pens.

10 writing instrument 20 refill 21 ballpoint pen tip 22 joint 23 ink storage tube 23A raised portion 24 ink 25 follower 26 resin ball 27 knock spring 30 barrel 30A front barrel 31 tapered portion 32 locking projection 33 stepped recess 34 female screw groove 35 opening 36 cap 37 clip 38 knock bar 39 knock cover 40 component 41 bottom 42 partition 43 vent 44 vent 45 second reservoir 46 partition 47 first contact portion 50 outer cylindrical portion 51 male screw groove 52 fitting portion 53 convex Part 54 Front rib 60 Inner cylindrical part 61 First storage part 62 Ventilation port 63 Second contact part 64 Rear rib 65 Side rib 66 Cam tooth 67 Connection projection 68 Front edge 70 Decorative member 71 Front part 72 Rear part 73 Damping protrusion Line 74 Front opening 75 Diameter reduction step 76 Rear opening 77 Inner rib 78 Locking rib 80 Writing instrument set 81 Packaging

Claims (1)

a refill containing ink;
a barrel containing the refill;
A writing instrument comprising a part that abuts on the rear end of the refill and is attached to the rear end of the barrel,
Said parts include:
a cylindrical outer cylinder;
an inner cylindrical portion having a diameter smaller than that of the outer cylindrical portion and coaxially with the outer cylindrical portion, and having a front end edge positioned rearward of the front end edge of the outer cylindrical portion;
a bottom portion that closes the rear end side of the inner cylindrical portion;
a first storage portion, which is a space surrounded by the inner surface of the bottom portion and the inner peripheral surface of the inner cylindrical portion, and stores the content when it flows out from the rear end of the refill;
a plurality of partitions for partitioning the space between the outer tubular portion and the inner tubular portion into a plurality of partitions in the circumferential direction;
a partition wall that closes a portion on the rear end side of the front end of the inner tubular portion in at least some of the plurality of partitions;
a second reservoir, which is a space on the distal end side of the partition in the partition having the partition;
a notch provided in a portion of the front edge of the inner cylindrical portion facing the second storage portion, the ventilation opening connecting the first storage portion and the second storage portion;
is provided, and
When the contents overflow from the first storage part, the contents can flow into the second storage part from the ventilation port and be stored therein ,
The component is further provided with a first contact portion that is the front edge of the partition portion, and a second contact portion that is a stepped portion formed on the inner periphery of the inner cylindrical portion from the tip side. Along with
A writing instrument, wherein any of a plurality of refills formed in different shapes can be incorporated in the barrel .

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