Ball point pen

Abstract

To provide a writing implement capable of providing flexibility to a holder with no need for the holder to be made of a specific material, as well as providing stability in a state of contact between a pen body and a part in a vicinity of a tip of an ink guide core when the holder is elastically deformed.SOLUTION: A ball point pen stores an ink in a barrel, and supplies the ink to a pen body at a tip of the barrel through an ink guide core. A ball is rotatably held at a tip of the pen body. The ball point pen holds the pen body at the tip, and comprises a cylindrical holder at the tip part of the barrel. Multiple notches open toward radially outward and radially inward are formed at axially different positions in a side wall of the holder behind a part holding the pen body of the holder and in front of the tip part of the barrel. Flange parts are formed between respective adjacent ones of the notches in the holder. Adjacent ones of the flange parts of the holder are connected via connection parts. The ink guide core is connected with the pen body.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a ballpoint pen, and more particularly 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. [Background technology]

[0002] Conventionally, Patent Document 1 describes a ballpoint pen in which a ballpoint pen tip has a ball rotatably attached to the tip, 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Jpn. Jpn. Published No. 59-016227 Summary of the Invention [Problem to be solved by the invention]

[0004] The ballpoint pen of Patent Document 1 has poor material options because the cylindrical part (corresponding to the holder part of the present application) cannot obtain flexibility unless the vertical rib is made of resin. Also, because the intermediate core (corresponding to the ink guide core of the present application) is in contact with the inner surface of the cylindrical part (corresponding to the inner surface of the holder part of the present application) and the inner surface of the vertical rib, 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 part is elastically deformed.

[0005] The present invention is intended to solve the above-mentioned problems of the conventional art, and aims to provide a writing instrument in which flexibility can be imparted to the holder section regardless of the specific material, and in which the contact state between the pen body and the area near the tip of the ink guide core is stable when the holder section is elastically deformed. [Means for solving the problem]

[0006] 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 ink guide core is connected to the pen body. The requirements are as follows.

[0007] The ballpoint pen of the first invention is 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. In addition, since no more load than necessary is applied to the writing tip portion, damage to the writing tip portion can be prevented.

[0008] 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 pen body is inserted into the inner hole of the pen body. The requirements are as follows.

[0009] The ballpoint pen of the second invention is 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.

[0010] The third invention of the present application is The ink guide core is The flange is not in contact with the inner surface of the holder. The requirements are as follows.

[0011] The ballpoint pen of the third invention is 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.

[0012] The fourth invention of the present application is The holder part is made of resin. The requirements are as follows.

[0013] The ballpoint pen of the fourth invention is By making the holder part from resin, it is possible to impart greater and appropriate flexibility to the holder part.

[0014] 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 the 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 ink guide core is connected to the pen body. The requirements are as follows.

[0015] The ballpoint pen of the fifth invention is 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. Effect of the Invention

[0016] 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. [Brief description of the drawings]

[0017] [Figure 1] 1 is a diagram showing a first embodiment of a ballpoint pen equipped with a holder portion of the present invention. [Diagram 2] FIG. 2 is an enlarged longitudinal sectional view of a main portion of FIG. [Diagram 3] 2A and 2B are a front view and a bottom view of the vicinity of a holder portion according to the first embodiment of the present invention. [Figure 4] FIG. 4 is an enlarged longitudinal sectional view of a main portion of FIG. [Diagram 5] 5 is a cross-sectional view taken along line AA and line BB in FIG. 4. FIG. [Figure 6] 1 is an enlarged perspective view of a main portion of a first embodiment of the present invention; [Figure 7] 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. [Figure 8] FIG. 8 is an enlarged longitudinal sectional view of a main portion of FIG. [Figure 9] 9A and 9B are cross-sectional views taken along lines CC, DD and EE in FIG. 8, respectively. [Figure 10] FIG. 11 is an enlarged perspective view of a main portion of a second embodiment of the present invention. [Figure 11] 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. [Figure 12] FIG. 12 is an enlarged longitudinal sectional view of a main portion of FIG. [Figure 13] 13 are cross-sectional views taken along the lines FF, GG and HH in FIG. 12 . [Figure 14] FIG. 13 is an enlarged perspective view of a main portion of a third embodiment of the present invention. [Figure 15] 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. [Figure 16] FIG. 16 is an enlarged longitudinal sectional view of a main portion of FIG. [Figure 17] 17A and 17B are cross-sectional views (II), (JJ) and (KK) taken along the lines II, JJ and KK in FIG. 16. [Figure 18] FIG. 13 is an enlarged perspective view of a main portion of a fourth embodiment of the present invention. [Figure 19] FIG. 13 is an enlarged longitudinal sectional view of a main portion of a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] An embodiment of the ballpoint pen of the present invention is shown in Figs.

[0019] 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 that connects the pen body 3 and the ink retaining member 5, a barrel 21 that directly contains the ink, and a writing instrument body 2 equipped with an ink guide core 6 that guides the ink in the barrel 21 to the pen body 3.

[0020] ·Shaft cylinder The barrel 21 is a cylindrical body having an open front end and a closed rear end, which is obtained by injection molding of a synthetic resin. The ink retaining member 5 is fitted into the inner surface of the front end opening 21a of the barrel 21.

[0021] Ink storage compartment The ink reservoir 21b is formed inside the barrel 21, which is a bottomed cylinder with an open front end and a closed rear end. Four ribs 21c extending in the axial direction are formed integrally at equal intervals on the inner peripheral surface of the ink reservoir 21b. The ribs 21c also serve as stoppers for the ink retaining member 5.

[0022] Pen type The pen body 3 can be a tip formed by holding the ball 32 in a ball holding portion 32a formed by pressing inward from the outer surface near the tip of a metal pipe, or a tip formed by holding the ball 32 in the 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 balls 32 may be made of cemented carbide, stainless steel, ruby, ceramic, resin, rubber, etc., and have 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.

[0023] The pen body 3 has a fitting portion 33 at its rear end. The pen body 3 has an inner hole 33a that opens rearward, and an ink guide core 6 is inserted into the inner hole 33a.

[0024] 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 guide path having 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.

[0025] The ink guide core 6 is not in contact with the holder part inner surface 44. As a result, even when the holder part 4 is bent, the ink guide core does not bend along the bent holder part inner surface 44, so that the contact state between the ink guide core 6 and the deepest part of the inner hole 33a of the pen body 3 is properly maintained, resulting in more stable writing performance.

[0026] Ink retaining material The ink retaining member 5 is a member that temporarily retains excess ink in response to a pressure rise in the ink storage portion 21b. The ink retaining member 5 is made of an injection molded synthetic resin (e.g., ABS resin) in which an ink retaining portion 51 (comb groove portion) consisting of a plurality of comb teeth, a rear end of the ink retaining portion 51 (i.e., the rear end surface of the rear end comb teeth 52), and an attachment portion 53 protruding forward from the front end of the ink retaining portion 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. An ink guide core 6 is inserted into the axial hole 54. The holder portion 4 is attached to the attachment portion 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 portion 51 is made of a spiral groove or a labyrinth groove, or the ink retaining portion 51 is made of a fiber material or a porous material.

[0027] 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 generally flush with or protrudes from the rear end surface of the ink reserve member 5.

[0028] Holder part Holder part 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 pen body holding part 41 at the front of holder part 4 is fitted with the outer surface of pen body 3, and the inner surface of main body attachment part 42 at the rear of holder part 4 is fitted with attachment part 53 of ink reserve member 5. It is also preferable that holder part 4 and attachment part 53 (ink reserve member 5) are integrally molded products, as this reduces the number of parts.

[0029] The holder 4 may be made of metal or synthetic resin, 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), acrylonitrile-butadiene-styrene copolymer resin (ABS resin), etc. Also, an example of a metal is an aluminum alloy.

[0030] Notch 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 holder part 4, and flange parts 43b are formed between the notches 43a. That is, since the notches 43a penetrate from the holder side wall 43 to the holder inner surface 44, 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.

[0031] A plurality of notches 43a are formed in the holder part side wall 43 of the holder part 4 at different axial positions, and semicircular plate-shaped flange portions 43b are formed between the notches 43a, thereby imparting flexibility to the holder part 4.

[0032] As shown in Figure 3, When the notch 43a is provided which penetrates perpendicularly to the direction X and opens in the direction X, flexibility in the direction X can be imparted to the holder portion 4.

[0033] By imparting flexibility in the direction X to the holder part 4, a soft writing feel can be obtained. In addition, since more load than necessary is not applied to the writing tip, damage to the writing tip can be prevented. In addition, the writing feel can be set as desired by adjusting the dimensions and number of the notches 43a.

[0034] Furthermore, because the flange portions 43b are connected to each other by the connecting portion 43c, the pen body 3 bends with the connecting portion 43c as a fulcrum, thereby imparting higher flexibility to the holder portion 4.

[0035] Second embodiment 7 to 10 show a second embodiment of the present invention. As shown in Figure 7, When notches 43a that penetrate perpendicularly to direction X and open in direction X and notches 43a that penetrate perpendicularly to direction Y and open in direction Y are formed alternately in the axial direction, flexibility in all directions, including radial and axial directions, can be imparted to the holder portion 4.

[0036] By providing the holder part 4 with 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.

[0037] Third embodiment 11 to 14 show a third embodiment of the present invention. As shown in Figure 11, When irregularly shaped notches 43a that penetrate perpendicularly to direction X and open in direction X and irregularly shaped notches 43a that penetrate perpendicularly to direction Y and open in direction Y are formed alternately in the axial direction, it is possible to impart flexibility to the holder part 4 similar to that of the third embodiment, and similar effects can be obtained.

[0038] The notch 43a may be in any shape, regardless of the band-like shape, as long as it can provide flexibility to the holder portion 4.

[0039] 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.

[0040] When the notch 43a is threaded in the holder portion side wall 43, a spiral connecting portion 43c (or flange portion 43b) is formed.

[0041] Fifth embodiment -Flexibility suppression material FIG. 19 shows a fifth embodiment of the present invention. The flexibility suppressing member 7 is made of, for example, a cylindrical body 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.

[0042] 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 has flexibility, the flexibility can be changed as desired by attaching the flexibility suppressing member 7 to the holder part 4. [Explanation of symbols]

[0043] 1 ballpoint pen 2 Writing instrument body 21 Shaft cylinder 21a Front end opening 21b Ink storage section 21c Rib 3 Pen type 31 Writing tip 32 Ball 32a Ball gripping part 32b Ball seat 33 Fitting part 33a inner hole 4 Holder part 41 Pen holder 42 Main body mounting part 43 Holder side wall 43a Notch 43b Tsubabe 43c Connecting part 44 Inner surface of holder 5 Ink retaining material 51 Ink storage section 52 Rear end comb groove 53 Mounting part 54 Axial center hole 6 Ink guide core 7 Flexibility control member

Claims

1. 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 ink guide core is connected to the pen body. A ballpoint pen characterized by

2. The pen body has an inner hole that opens to the rear, The tip of the ink guide core is The pen body is inserted into the inner hole of the pen body.

2. The ballpoint pen according to claim 1.

3. The ink guide core is The flange is not in contact with the inner surface of the holder.

3. The ballpoint pen according to claim 1 or 2.

4. The holder part is made of resin.

4. The ballpoint pen according to claim 1, wherein the ballpoint pen is a ballpoint pen having a diameter of 100 mm or less.

5. 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 ink guide core is connected to the pen body. A ballpoint pen characterized by

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