WO2018097243A1

WO2018097243A1 - Ballpoint pen

Info

Publication number: WO2018097243A1
Application number: PCT/JP2017/042200
Authority: WO
Inventors: 中島　徹; 古川　和彦; 剛生福本
Original assignee: 三菱鉛筆株式会社
Priority date: 2016-11-25
Filing date: 2017-11-24
Publication date: 2018-05-31
Also published as: JP2018083397A

Abstract

The present invention changes the thickness of a drawn line by increasing ink flow in association with writing load without using a member other than the tip of a ballpoint pen that can contact a writing surface and achieves a soft writing feel with the cushioning effect of a connector. A connector 20 for connecting a ballpoint pen tip 60 with an ink-holding tube 16 is provided with a back member 30 that is installed on the leading end of the ink-holding tube 16, a front member 40 on which the back end of the ballpoint pen tip 60 is installed, and an intermediate member 50 for connecting same. The intermediate member 50 has a structure with greater elasticity than the back member 30 and the front member 40. The back member 30 is provided with: a cylindrical back connecting part 31 that is press-fitted inside the leading end of the ink-holding tube 16; a flange part 33 that expands radially in front of the back connecting part 31 by means of a step 32; and a front connecting part 34, the outer diameter of which decreases in front of the flange part 33 and to which the intermediate member 50 connects. Additionally, the leading end of the ink-holding tube 16 abuts against the step 32.

Description

Ballpoint pen

The present invention relates to a ballpoint pen.

Conventionally, various attempts have been made to make it possible to write strokes of different thicknesses with a single writing ball in a ballpoint pen.

For example, in the technique described in Japanese Patent Application Laid-Open No. 2013-252655, the relative positional relationship between a holder that holds a writing ball and a member that covers the outer periphery of the holder (referred to as “outer” in the same document) is used. It is disclosed that by making it displaceable, it is possible to thicken the drawn line by the writing ball and the outer than the drawn line by only the writing ball.

In the technique described in Japanese Patent Application Laid-Open No. 2015-199302, a joint that connects the ink supply unit (referred to as “collector” in the same document) and the writing tip is composed of three members. Specifically, a member inserted into the front end of the ink supply unit (“center member”), a member inserted outside the front end of the ink supply unit (“peripheral member”), and a soft member that connects these two members ("Intervening member"), and the document discloses that the bending amount of the nib can be changed by the elastic deformation of the intervening member.

The present invention changes the thickness of the drawn line by increasing the ink flow rate according to the writing load without using a member that can contact the writing surface in addition to the ballpoint pen tip, and the soft writing touch by the cushion effect by the joint. The realization of

In order to solve the above problems, a first aspect of the present invention includes a ballpoint pen tip as a writing tip, an ink storage tube that stores ink, a joint that connects the ballpoint pen tip and the ink storage tube, and the ink A ballpoint pen that accommodates a storage tube therein, wherein the joint includes a rear member attached to a tip of the ink storage tube, a front member attached to a rear end of the ballpoint pen tip, An intermediate member that connects the rear member and the front member, and the intermediate member has a structure richer in elasticity than the rear member and the front member, and the rear member is located inside the tip of the ink containing tube. A cylindrical rear connecting portion that is press-fitted into the flange, a flange portion that has a stepped portion in front of the rear connecting portion, and an outer diameter that decreases in front of the flange portion and the intermediate portion. There a front connecting portion that connects, with comprises the tip of the ink containing tube in the step portion is equal to or abutting.

In addition to the features of the first aspect, the second aspect of the present invention is characterized in that the intermediate member is formed of a material different from that of the rear member and the front member. The intermediate member rear portion covering the outer periphery of the front connection portion, the intermediate member front portion covering the outer peripheral portion on the rear side of the front member, the intermediate member rear portion and the intermediate member front portion, and an outer diameter It is characterized by comprising an intermediate member intermediate part which is reduced in diameter.

Further, according to a third aspect of the present invention, in addition to the features of the first aspect, the intermediate member is integrally formed of the same material as the rear member and the front member, and the tip portion of the rear member A covering member for partially covering the gap 55 between the front end portion of the rear member and the rear end portion of the front member. It is further provided.

Since the present invention is configured as described above, the thickness of the drawn line is changed by increasing the ink flow rate with the writing load without using a member that can contact the writing surface in addition to the ballpoint pen tip. A soft writing touch can be realized by the cushion effect of the joint. Specifically, it is as follows.

According to the configuration of the first aspect of the present invention, the joint is composed of three members: a rear member, a front member, and an intermediate member. The front member is positioned in front of the rear member. An intermediate member is interposed between the rear member and the front member. Since the intermediate member has a structure richer in elasticity than the rear member and the front member, the intermediate member is elastically deformed by a writing load, and thereby the front member is displaced rearward with respect to the rear member. Here, the ink flowing from the ink storage tube exists inside the joint, but the internal volume is reduced by the elastic deformation of the intermediate member, and the ink corresponding to the reduced volume is transferred from the front member to the ball-point pen tip. It is to be pushed out. That is, the pump effect of the joint accompanying a writing load is exhibited because the three members have the structure and positional relationship as described above. In order to make the pump effect more effective, it is desirable to provide a backflow prevention structure such as a check ball in the joint so that the ink inside the intermediate member does not flow back toward the ink storage tube.

The rear member is press-fitted into the front end of the ink storage tube, and the front end of the ink storage unit abuts against the step portion of the flange portion, so that the connection between the ink storage tube and the rear member is ensured. The positional relationship between the rear member and the ink storage tube is not changed by the writing load.

According to the configuration of the second aspect of the present invention, in addition to the effect of the first aspect, the intermediate member of the joint is made of another material that is more elastic than the other two members, and the outer diameter is further reduced. The intermediate member intermediate portion is shaped to be easily elastically deformed. Thereby, in addition to the pump effect of the joint described above, a cushion effect is also exhibited.

According to the configuration of the third aspect of the present invention, in addition to the effect of the first aspect, the intermediate member of the joint is made of the same material as the other two members, but, for example, is thinner than the other two members. Or by providing an opening or a gap in part, it is easy to be elastically deformed.

In addition, as a structure which is easy to perform such elastic deformation, for example, when an opening or a gap is provided in a part of the intermediate member, and thereby the rear member and the front member are partially connected Is provided with a covering member in order to prevent leakage of ink from such an opening or gap. Such a covering member does not need to consider elasticity, and may be formed using a material having extremely low rigidity.

It is a front view of the appearance of the ball-point pen concerning a 1st embodiment of the present invention. It is a fragmentary sectional view of FIG. 1A. It is a front view of the external appearance of the refill accommodated in the ball-point pen of FIG. 1A. The joint used for the refill of FIG. 1C is shown with a front perspective view. The joint used for the refill of FIG. 1C is shown by a rear perspective view. The joint used for the refill of FIG. 1C is shown with a bottom view. The joint used for the refill of FIG. 1C is shown with a front view. The joint used for the refill of FIG. 1C is shown with a top view. The joint used for the refill of FIG. 1C is shown with front sectional drawing. A state in which the joint of FIGS. 2A to 2F is attached to the refill is shown in an overall front view of the refill. A state in which the joint of FIGS. 2A to 2F is attached to the refill is shown in an overall cross-sectional view of the refill. The state in which the joint of FIGS. 2A to 2F is attached to the refill is shown in an enlarged sectional view of the refill. The state in which the joint is compressed from the states of FIGS. 3A to 3C is shown by the entire front view of the refill. The state in which the joint is compressed from the states of FIGS. 3A to 3C is shown by an overall cross-sectional view of the refill. The state in which the joint is compressed from the states of FIGS. 3A to 3C is shown in an enlarged cross-sectional view of the refill. It is a front view of the coupling used in the 2nd embodiment of the present invention. It is a front view of the primary molded product of the joint used in the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, “front” and “front end” of the ballpoint pen 10 and its component parts indicate directions in which the ballpoint pen tip 60 is provided, and “rearward” and “rear end” indicate directions on the opposite side. Shall be shown.

[First Embodiment]
(overall structure)
In the ballpoint pen 10 according to the first embodiment, as shown in FIGS. 1A and 1B, a tapered tip shaft 12 that is reduced in diameter toward the tip is screwed onto the tip of a substantially cylindrical shaft 11. On the other hand, a tail plug 13 is attached to the rear end. The ballpoint pen tip 60, which is a part of the refill 15, protrudes from the tip of the tip shaft 12. Further, a refill 15 having an appearance as shown in FIG. 1C is accommodated in the shaft cylinder 11. The refill 15 includes an elongated cylindrical ink storage tube 16 that stores ink (not shown), a joint 20 attached to the tip of the ink storage tube 16, and a ballpoint pen tip 60 attached to the tip of the joint 20. It has. In other words, the ballpoint pen tip 60 is attached to the ink containing tube 16 via the joint 20.

(Fitting 20)
As shown in FIGS. 2A to 2F, the joint 20 includes a rear member 30 located at the rear, a front member 40 located at the front, and an intermediate member 50 connecting the rear member 30 and the front member 40. The

As shown in FIG. 2F, the rear member 30 includes a cylindrical rear connection portion 31, a flange portion 33 having a stepped portion 32 in front of the rear connection portion 31, and an outer diameter in front of the flange portion 33. Is constituted by a reduced front connection portion 34. Inside the rear connection portion 31, an ink circulation hole 35 extending from the rear end of the rear connection portion 31 to the vicinity of the tip of the flange portion 33 is formed. In front of the ink circulation hole 35, a funnel portion 37 whose diameter is enlarged in a truncated cone shape is formed through a narrowed portion 36 once reduced in diameter.

The front member 40 has a substantially cylindrical shape, and is formed with a chip insertion hole 41 penetrating the inside from the rear end to the front end.

The intermediate member 50 includes a substantially annular intermediate member rear portion 51 that covers the front connection portion 34 of the rear member 30, an intermediate member front portion 52 that covers an outer peripheral portion on the rear side of the front member 40, the intermediate member rear portion 51, and The intermediate member front portion 52 is connected to the intermediate member 53, and the intermediate member 53 includes an intermediate member intermediate portion 53 having a reduced outer diameter. The intermediate member intermediate portion 53 is a portion that exhibits a cushion effect because it is compressed by applying a force in the front-rear direction.

(Two-color molding)
The joint 20 is a part formed by two-color molding. That is, the rear member 30 and the front member 40 are formed by primary molding, and the intermediate member 50 is finally integrally formed by secondary molding with respect to the rear member 30 and the front member 40 as primary molded products. The intermediate member 50 is formed of an elastic resin material so as to bend at the intermediate member intermediate portion 53. As the elastic resin material, a thermoplastic elastomer is desirable because the molding process is performed at a high temperature using a mold. The material of the rear member 30 and the front member 40, which are primary molded bodies, is preferably a hard resin such as a PBT resin having a higher rigidity than the intermediate member 50.

The joint 20 may be formed by integral molding using the same resin material including not only the rear member 30 and the front member 40 but also the intermediate member 50. In this case, the portion corresponding to the intermediate member intermediate portion 53 is formed so that the cushioning effect can be exhibited by reducing the rigidity even with the same resin material, such as by reducing the thickness.

(Attaching the ballpoint pen tip 60)
As shown in FIGS. 3A to 3C, the joint 20 is connected to the ink containing tube 16 by the rear member 30 and is connected to the ball-point pen tip 60 by the front member 40.

Specifically, first, the check ball 21 made of stainless steel is inserted into the tip insertion hole 41 of the front member 40, and then the ballpoint pen tip 60 is press-fitted.

Here, as shown in FIG. 3C, the ball-point pen tip 60 has a structure in which a writing ball 68 made of super steel alloy is held at the tip of a holder 61 formed by cutting a stainless steel cylindrical material. Have. The holder 61 has an outer shape composed of a columnar cylindrical portion 63, a press-fit portion 62 whose outer diameter is reduced on the rear side, and a tapered portion 64 having a tapered shape on the front side. From the rear end of the holder 61 to the vicinity of the front end, a back hole 65 whose inner diameter is gradually reduced is formed. On the other hand, a ball house 66 that accommodates the writing ball 68 is perforated from the tip of the holder 61. The back hole 65 and the ball house 66 communicate with each other through an ink hole 67. The tip edge of the taper portion 64 is a crimped portion 69 that is plastically deformed inward, whereby the writing ball 68 is held.

In the ballpoint pen tip 60 having the above-described structure, the press-fitting portion 62 is press-fitted into the tip insertion hole 41 of the front member 40. In this state, the check ball 21 can move in a space from the funnel portion 37 inside the rear member 30 to the rear end of the ballpoint pen tip 60.

In the state where the ballpoint pen tip 60 is mounted in this way, the rear connection portion 31 of the rear member 30 of the joint 20 is press-fitted into the inside of the tip of the ink containing tube 16. At this time, the leading end of the ink containing tube 16 is in contact with a step portion 32 that forms the rear surface of the flange portion 33 of the rear member 30.

(Function of fitting 20)
When writing pressure is applied to the tip of the ballpoint pen tip 60 during writing, the force compresses the intermediate member intermediate portion 53 of the intermediate member 50 of the joint 20 as shown in FIGS. 4A to 4C, thereby exhibiting a cushioning effect. Is done.

At this time, the space behind the rear end of the ballpoint pen tip 60 is compressed. Then, as shown in FIG. 4C, the check ball 21 is pressed backward by this compression, contacts the funnel portion 37, and closes the narrow portion 36. As a result, the ink existing in the space cannot be backflowed in spite of this compression, and is pushed out to the front end side. As a result, the amount of ink ejected from the tip of the ballpoint pen tip 60 increases, and writing with a thicker drawn line becomes possible. That is, the joint 20 also exhibits a pumping effect that pushes out ink by writing pressure.

In addition, when the pen pressure is applied at a certain angle rather than vertically, the intermediate member intermediate portion 53 is compressed unevenly, so that the joint 20 can be appropriately bent. (Bend effect).

[Second Embodiment]
In the second embodiment, the joint 20 has an appearance as shown in FIG. 5A. At first glance, this joint 20 appears to have the same appearance as the joint 20 (see FIG. 2D) in the first embodiment, but the structure of the intermediate member 50 is different. That is, as shown in FIG. 5B, the intermediate positions located obliquely at two positions facing each other across the axis between the front end edge of the front connection portion 34 of the rear member 30 and the rear end edge of the front member 40. The members 50 are connected. In the front view shown in FIG. 5B, the intermediate member 50 on the near side and the intermediate member 50 on the far side appear to intersect in an X shape. A gap 55 is formed between the two intermediate members 50.

Also in the present embodiment, the joint 20 is formed by two-color molding. That is, the structure shown in FIG. 5B is formed by primary molding, and then the covering member 25 shown in FIG. 5A is formed by secondary molding. As with the intermediate member 50 in the first embodiment, the covering member 25 covers from the front connecting portion 34 to the rear side portion of the front member 40, and has a shape in which the intermediate portion is curled. However, the covering member 25 is formed for the purpose of closing the gap 55 between the intermediate members 50 and preventing leakage of ink, and is not necessarily formed of an elastic member.

The joint 20 in this embodiment constitutes one part of the refill 15 as in the first embodiment (see FIG. 1C), and this refill 15 is also housed in the ballpoint pen 10 (see FIGS. 1A and 1C). (See FIG. 1B). Further, the two intermediate members 50 are made of the same material as that of the rear member 30 and the front member 40, but have a narrower width and are more easily elastically deformed than the rear member 30 and the front member 40. The same cushioning effect, pumping effect, and bend effect are also exhibited by the elastic deformation accompanying this.

The present invention can be used for a ballpoint pen.

Claims

Ballpoint pen tip as writing tip,
An ink containing tube for containing ink;
A joint for connecting the ball-point pen tip and the ink containing tube;
A shaft cylinder for storing the ink storage tube therein;
A ballpoint pen having
The joint is
A rear member attached to the tip of the ink containing tube;
A front member to which a rear end of the ballpoint pen tip is attached;
An intermediate member connecting the rear member and the front member;
With
The intermediate member has a structure richer in elasticity than the rear member and the front member,
The rear member is
A cylindrical rear connection portion that is press-fitted into the tip of the ink storage tube;
A flange portion having a stepped portion in front of the rear connection portion,
A front connection portion where the outer diameter is reduced in front of the flange portion and the intermediate member is coupled;
With
A ballpoint pen, wherein a tip of the ink storage tube is in contact with the stepped portion.
The intermediate member is
The rear member and the front member are formed of a different material,
An intermediate member rear portion covering the outer periphery of the front connection portion of the rear member;
An intermediate member front portion covering an outer peripheral portion on the rear side of the front member;
While connecting the intermediate member rear portion and the intermediate member front portion, and an intermediate member intermediate portion that has a reduced outer diameter,
The ball-point pen according to claim 1, comprising:
The intermediate member is integrally formed of the same material as the rear member and the front member, and partially connects the front end portion of the rear member and the rear end portion of the front member.
The ballpoint pen according to claim 1, further comprising a covering member that covers a gap between a front end portion of the rear member and a rear end portion of the front member from the outside.