JP7579909B2 - Ballpoint pen - Google Patents

Description

The present invention relates to a ballpoint pen. More specifically, the present invention relates to a ballpoint pen that contains ink in a barrel and supplies the ink to a pen body at the tip of the barrel via an ink guide member.

Patent Document 1 describes a conventional ballpoint pen in which a ball is attached to the tip of the ballpoint pen tip so that it can rotate freely, a notch is formed in the cylindrical middle part of the tip leaving two or more vertical ribs, an ink relay core is installed inside the tip to guide ink into the tip, and the base of the tip is attached to the barrel body.

Japanese Utility Model Publication No. 59-016227

The ballpoint pen of Patent Document 1 has poor material options because the portion forming the vertical ribs must be made of resin in order to obtain flexibility in the cylindrical portion (corresponding to the holder portion of the present application). In addition, because the intermediate core (corresponding to the ink guide core of the present application) is in contact with the inner surface of the cylindrical portion (corresponding to the inner surface of the holder portion of the present application) and the inner surface of the vertical ribs, there is a risk that the contact state between the tip (corresponding to the pen body of the present application) and the tip of the intermediate core will become unstable when the cylindrical portion is elastically deformed.

The present invention aims to solve the above-mentioned problems of the conventional art by providing a writing instrument that can impart flexibility to the holder section regardless of the specific material, and that has stable contact between the pen body and the area near the tip of the ink guide core when the holder section is elastically deformed.

The first invention of the present application is
A ballpoint pen that contains ink in a barrel and supplies the ink to a pen body at the tip of the barrel through an ink guide core,
The pen body has a ball rotatably supported at its tip,
A cylindrical holder portion is provided at the tip of the barrel to hold the pen body at the tip,
A plurality of notches opening radially outward and radially inward are formed at different positions in the axial direction on a side wall of the holder part rearward of the pen body holding part and forward of the tip of the barrel,
A flange portion is formed between the notches of the holder portion,
The flanges of the holder are connected to each other by a connecting portion,
The requirement is that the ink guide core is connected to the pen body.

The ballpoint pen of the first invention comprises:
A plurality of notches opening radially outward and radially inward are formed at different axial positions on the side wall (flexibility imparting portion) of the holder portion rearward of the pen body holding portion and forward of the barrel tip, and flanges are formed between the notches of the holder portion, and the flanges of the holder portion are connected to each other by connecting portions, thereby imparting high flexibility to the strong holder portion and providing a soft writing feel. Also, since no more load than necessary is applied to the writing tip portion, damage to the writing tip portion can be prevented.

The second invention of the present application is
The pen body has an inner hole that opens to the rear,
The tip of the ink guide core is
The requirement is that the pen body is inserted into the inner hole of the pen body.

The ballpoint pen of the second invention comprises:
The tip of the ink guide core is inserted into the inner hole of the pen body, so that even when the holder part is bent, the ink guide core reliably contacts the deepest part of the inner hole of the pen body, quickly supplies sufficient ink to the pen body, and stable writing performance is obtained.

The third invention of the present application is
The ink guide core is
The requirement is that the flange portion does not come into contact with the inner surface of the holder portion.

The ballpoint pen of the third invention comprises:
Since the ink guide core is not in contact with the inner surface of the holder part of the flange, the ink guide core does not bend along the inner surface of the bent holder part even when the holder part is bent, so that the contact state between the ink guide core and the deepest part of the inner hole of the pen body is properly maintained, resulting in more stable writing performance.

The fourth invention of the present application is
The holder portion is required to be made of resin.

The ballpoint pen of the fourth invention comprises:
By making the holder part from resin, it is possible to impart greater and appropriate flexibility to the holder part.

The fifth invention of the present application is
A ballpoint pen that contains ink in a barrel and supplies the ink to a pen body at the tip of the barrel through an ink guide core,
The pen body has a ball rotatably supported at its tip,
A cylindrical holder portion is provided at the tip of the barrel to hold the pen body at the tip,
At least one or more spiral notches opening radially outward and radially inward are formed in a side wall of the holder part rearward of the pen body holding part of the holder part and forward of the tip of the barrel,
A connecting portion is formed between the notches of the holder portion,
The requirement is that the ink guide core is connected to the pen body.

The ballpoint pen of the fifth invention comprises:
At least one or more spiral notches opening radially outward and radially inward are formed on the side wall of the holder part behind the pen body holding part and in front of the tip of the barrel, and connecting parts (or flange parts) are formed between the notches of the holder part, thereby imparting high flexibility to the strong holder part and providing a soft writing feel. In addition, since no more than necessary load is applied to the writing tip part, damage to the writing tip part can be prevented.

The ballpoint pen of the present invention is
The strong holder part can be made highly flexible, providing a soft writing feel. In addition, since more than necessary load is not applied to the writing tip, damage to the writing tip of the pen body can be prevented.

1 is a diagram showing a first embodiment of a ballpoint pen having a holder portion of the present invention; FIG. 2 is an enlarged longitudinal sectional view of a main portion of FIG. 1 . 3A and 3B are a front view and a bottom view of the vicinity of a holder portion according to the first embodiment of the present invention; FIG. 4 is an enlarged longitudinal sectional view of a main portion of FIG. 3 . 5A and 5B are cross-sectional views taken along the lines AA and BB in FIG. 4. 1 is an enlarged perspective view of a main portion of a first embodiment of the present invention; 13A and 13B are a front view and a bottom view of the vicinity of a holder portion according to a second embodiment of the present invention. FIG. 8 is an enlarged longitudinal sectional view of a main portion of FIG. 7 . 9 are cross-sectional views taken along lines CC, DD and EE in FIG. 8, respectively. FIG. 11 is an enlarged perspective view of a main portion of a second embodiment of the present invention. 13A and 13B are a front view and a bottom view of the vicinity of a holder portion according to a third embodiment of the present invention. FIG. 12 is an enlarged longitudinal sectional view of a main portion of FIG. 11 . 13 are (FF) cross-sectional views, (GG) cross-sectional views and (HH) cross-sectional views taken along the cutting lines FF, GG and HH in FIG. 12. FIG. 13 is an enlarged perspective view of a main portion of a third embodiment of the present invention. 13A and 13B are a front view and a bottom view of the vicinity of a holder portion according to a fourth embodiment of the present invention. FIG. 16 is an enlarged longitudinal sectional view of a main portion of FIG. 15 . 17 are cross-sectional views (II), (JJ) and (KK) taken along the cutting lines II, JJ and KK in FIG. 16. FIG. 13 is an enlarged perspective view of a main portion of a fourth embodiment of the present invention. FIG. 13 is an enlarged longitudinal sectional view of a main portion of a fifth embodiment of the present invention.

An embodiment of the ballpoint pen of the present invention is shown in Figures 1 to 19.

First Embodiment
1 to 6 show a first embodiment of the present invention.
The ballpoint pen 1 of this embodiment comprises a pen body 3, an ink retaining member 5, a holder portion 4 which connects the pen body 3 and the ink retaining member 5, a barrel 21 which directly contains the ink, and a writing instrument body 2 which is provided with an ink guide core 6 which guides the ink in the barrel 21 to the pen body 3.

The barrel 21 is a cylindrical body with an open front end and a closed rear end, which is obtained by injection molding of synthetic resin. The ink retaining member 5 is fitted into the inner surface of the front end opening 21a of the barrel 21.

Ink reservoir 21b is formed inside a cylindrical barrel 21 with an open front end and a closed rear end. Four ribs 21c extending in the axial direction are formed integrally with the inner circumferential surface of the ink reservoir 21b at equal intervals. The ribs 21c also serve as stoppers for the ink reserve member 5.

Pen body The pen body 3 can be a tip formed by holding a ball 32 in a ball holding portion 32a formed by pressing and deforming the vicinity of the tip of a metal pipe inwards from the outer surface, or a tip formed by holding a ball 32 in a ball holding portion 32a formed by cutting a metal material with a drill or the like, or a tip having a resin ball receiving seat 32b provided inside a metal or plastic tip, etc.
The ball 32 may be made of cemented carbide, stainless steel, ruby, ceramic, resin, rubber, etc., and has a diameter of about 0.3 to 3.0 mm, preferably 0.3 to 1.5 mm, and more preferably 0.4 to 1.0 mm.

The pen body 3 has a fitting portion 33 at the rear end. The pen body 3 has an inner hole 33a that opens to the rear, and the ink guide core 6 is inserted into the inner hole 33a.

Ink guide core The ink guide core 6 is inserted into the inner hole 33a of the pen body 3. The ink guide core 6 may be any material that has an axial ink lead-out path that has capillary force, and in this embodiment, a rod-shaped material obtained by resin processing of fibers is used, but other materials such as a porous material or an extrusion molded body of a rigid resin may also be used.

The ink guide core 6 is not in contact with the holder inner surface 44. As a result, even when the holder 4 is bent, the ink guide core does not bend along the bent holder inner surface 44, so the ink guide core 6 is kept in proper contact with the deepest part of the inner hole 33a of the pen body 3, resulting in more stable writing performance.

Ink Reservoir Member The ink retaining member 5 is a member that temporarily retains excess ink in response to an increase in pressure in the ink storage section 21b. The ink retaining member 5 is an injection molded body of synthetic resin (e.g., ABS resin) in which an ink retaining section 51 (comb groove section) consisting of a plurality of comb teeth, a rear end of the ink retaining section 51 (i.e., the rear end surface of the rear comb teeth 52), and an attachment section 53 protruding forward from the front end of the ink retaining section 51 are integrally formed. In addition, an axial hole 54 that extends in the axial direction and has both ends open is provided at the axial center of the ink retaining member 5. The ink guide core 6 is inserted into the axial hole 54. The holder section 4 is attached to the attachment section 53. In addition to the configuration, the ink retaining member 5 in the present invention may be any of those in which the ink retaining section 51 is made of a spiral groove or a labyrinth groove, or the ink retaining section 51 is made of a fiber material or a porous material.

The ink guide core 6 is inserted into the axial hole 54. The front end of the ink guide core 6 is connected to the pen body 3, and the rear end of the ink guide core 6 is approximately aligned with or protrudes from the rear end surface of the ink reserve member 5.

Holder section The holder section 4 is made of, for example, a cylindrical body obtained by injection molding of a processed metal member or a synthetic resin. The inner surface of the pen body holding section 41 at the front of the holder section 4 is fitted with the outer surface of the pen body 3, and the inner surface of the main body mounting section 42 at the rear of the holder section 4 is fitted with the mounting section 53 of the ink reserve member 5. It is also preferable that the holder section 4 and the mounting section 53 (ink reserve member 5) are integrally molded, as this reduces the number of parts.

The holder part 4 may be made of metal or synthetic resin material, and examples of the synthetic resin material include relatively hard synthetic resins such as polypropylene, polyethylene, polystyrene, polycarbonate, polyethylene terephthalate, polyacetal, acrylic, nylon, acrylonitrile-styrene copolymer resin (AS resin), and acrylonitrile-butadiene-styrene copolymer resin (ABS resin). Also, an example of a metal is an aluminum alloy.

A plurality of semicircular notches 43a opening radially outward and radially inward are formed at different positions in the axial direction on the holder side wall 43 behind the pen body holding part 41 and in front of the main body attachment part 42 of the notched holder part 4, and flange parts 43b are formed between the notches 43a. That is, the notches 43a penetrate from the holder side wall 43 to the holder inner surface 44, so that the color of the ink guide core 6 inside can be seen and the color of the ink stored therein can be identified. The flange parts 43b are connected to each other by connecting parts 43c.

Multiple notches 43a are formed in the holder part side wall 43 of the holder part 4 at different positions in the axial direction, and semicircular plate-shaped flanges 43b are formed between the notches 43a, thereby imparting flexibility to the holder part 4.

As shown in Figure 3,
When the notch 43a is provided so as to penetrate perpendicularly to the direction X and open in the direction X, flexibility in the direction X can be imparted to the holder portion 4.

By imparting flexibility in the X direction to the holder portion 4, a soft writing feel can be obtained. In addition, damage to the writing tip can be prevented because more load than necessary is not applied to the writing tip. In addition, the writing feel can be set as desired by changing the dimensions and number of the notches 43a.

In addition, the flanges 43b are connected to each other by the connecting portion 43c, so that the pen body 3 flexes with the connecting portion 43c as a fulcrum, giving the holder portion 4 greater flexibility.

Second Embodiment
7 to 10 show a second embodiment of the present invention.
As shown in Figure 7,
When notches 43a that penetrate perpendicular to direction X and open in direction X and notches 43a that penetrate perpendicular to direction Y and open in direction Y are formed alternately in the axial direction, flexibility in all radial and axial directions can be imparted to the holder portion 4.

By giving the holder part 4 flexibility in all radial and axial directions, a soft writing feel can be obtained. In addition, damage to the writing tip can be prevented because more load than necessary is not applied to the writing tip. In addition, the writing feel can be set as desired by changing the dimensions and number of the notches 43a.

Third embodiment
11 to 14 show a third embodiment of the present invention.
As shown in Figure 11,
When irregularly shaped notches 43 a that penetrate perpendicular to direction X and open in direction X and irregularly shaped notches 43 a that penetrate perpendicular to direction Y and open in direction Y are formed alternately in the axial direction, the holder portion 4 can be given the same flexibility as in the third embodiment, and the same effects can be obtained.

The notch 43a can be set in any shape, regardless of the band shape, as long as it can provide flexibility to the holder part 4.

Fourth embodiment
15 to 18 show a fourth embodiment of the present invention.
As shown in Figure 15,
When at least one spiral notch 43 opening radially outward and radially inward is formed in the holder part side wall 43, that is, when at least one notch 43a is threadedly formed in the holder part side wall 43, the holder part 4 can be given the same flexibility as in the third embodiment, and the same effects can be obtained.

When the notch 43a is threaded into the holder part side wall 43, a spiral connecting part 43c (or flange part 43b) is formed.

Fifth embodiment
Flexibility Restricting Member FIG. 19 shows a fifth embodiment of the present invention.
The flexibility suppressing member 7 is made of, for example, a cylindrical member obtained by injection molding of a processed metal member or a synthetic resin. By fitting the flexibility suppressing member 7 to the holder part 4 as shown in FIG. 21, the flexibility imparted to the holder part 4 can be suppressed.

In addition, the flexibility of the holder part 4 can be set as desired by attaching and detaching the flexibility suppressing member 7. In addition, if the flexibility suppressing member 7 itself is flexible, the flexibility can be changed as desired by attaching the flexibility suppressing member 7 to the holder part 4.

Reference Signs List 1 Ballpoint pen 2 Writing implement body 21 Barrel 21a Front end opening 21b Ink storage section 21c Rib 3 Pen body 31 Writing tip section 32 Ball 32a Ball gripping section 32b Ball receiving seat 33 Fitting section 33a Inner hole 4 Holder section 41 Pen body holding section 42 Main body mounting section 43 Holder section side wall 43a Notch 43b Flange section 43c Connecting section 44 Holder section inner surface 5 Ink reserve member 51 Ink reserve section 52 Rear end comb groove 53 Mounting section 54 Axial hole 6 Ink guide core 7 Flexibility suppressing member

Claims (3)

The pen comprises a pen body, a barrel, ink contained inside the barrel, an ink guide core that supplies the ink to the pen body, and a holder that connects the pen body and a tip of the barrel,
The pen body has a ball rotatably supported at its front end and a fitting portion at its rear end.
The holder portion has a pen body holding portion on an inner surface of a front end and a main body attachment portion on a rear end,
A plurality of notches opening radially outward and radially inward are formed in a side wall of the holder portion rearward of the pen body holding portion and forward of the main body attachment portion,
The fitting portion and the pen body holding portion are fitted together,
The body attachment portion and the tip portion of the barrel are fitted together,
the ink guide core is connected to the pen body;
The color of the ink guide core is visible through the notch;
A flexibility suppressing member made of a cylindrical body is removably fitted to the holder portion.
A ballpoint pen characterized by The flexibility suppressing member has flexibility.
2. The ballpoint pen according to claim 1 . A step portion is formed at the rear of the pen body holding portion, and a rear end of the fitting portion abuts against the step portion,
The step portion is provided with a chamfered portion that expands in diameter rearward.
2. The ballpoint pen according to claim 1 .

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