JP6499391B2 - Writing instrument - Google Patents

Description

  The present invention relates to an ink refill equipped with a ballpoint pen tip colored on a part of the surface of the ballpoint pen tip, and a writing instrument containing the ink refill.

Conventionally, a holder for holding a writing ball in a ballpoint pen tip is mainly made of metal such as stainless steel. Such a metal ball-point pen tip naturally exhibits a metallic color resulting from the material.
There is often a design demand to color such a ballpoint pen tip exhibiting a metallic color so as to recall the ink color used, for example. As a method for meeting the demand, for example, it is conceivable to paint the surface of the ballpoint pen tip with a paint.
On the other hand, for example, as in the invention described in Patent Document 1 below, there is also provided a technique of providing a colored decorative body near the tip of a ball-point pen tip, regardless of painting. That is, in the invention described in this document, a ring-shaped or conical synthetic resin decorative body is attached to the outer periphery of the ball-point pen tip, for example, by making it the same color as the ink, so that the ink color can be easily identified. To do.

JP 2002-326487 A

The coating of the ballpoint pen tip in the above prior art is easily peeled off by contact with use. In particular, in a multi-color ballpoint pen on which a plurality of color ink refills are mounted, since the ink refill is frequently switched, contact between the ballpoint pen tips is likely to occur, thereby increasing the possibility of peeling off of the coating.
Also, in the case of a synthetic resin decorative body mounted on a ballpoint pen tip, it is less rigid than the metal that is the material of the ballpoint pen tip body, and therefore is easily worn and damaged by contact with use. In particular, in multi-color ballpoint pens with multiple colors of ink refills, ink refills are frequently switched, so that contact between the ballpoint pen tip and the shaft is likely to occur when the ink refills are fed, resulting in wear of the decorative body. And the possibility of breakage is higher. In addition, depending on the use environment, there is a high possibility of suffering deterioration over time.
In view of the above problems, an object of the present invention is to provide an ink refill that has been treated so as to improve the aesthetics of the ballpoint pen tip and not impair its durability, and a writing instrument using the ink refill.

In view of the above problems, the present invention provides:
An ink containing tube 40 for containing ink 41;
The ballpoint pen tip 20 attached to the tip of the ink containing tube 40,
The surface of the ball-point pen tip 20 has a color-developing layer 29 that has been subjected to oxidative color development.
In the present invention, the “tip” refers to the side where the writing tip is located in the writing instrument 70 to which the ink refill 10 according to the present invention is attached, and the “tip direction” refers to the direction toward the side where the writing tip is located. The “rear end” refers to the opposite side, and the “rear end direction” refers to the opposite direction.

In the ink refill 10 according to the present invention, the ball-point pen tip 20 is attached to the tip of the ink containing tube 40 directly or via an intervening member (joint 30). The portion of the ballpoint pen tip 20 other than the portion inserted into the ink storage tube 40 (or the joint 30) by mounting is an “exposed portion”. A part of the exposed portion is colored by the oxidative coloring process. Note that the front end side portion and the rear end side portion here are defined by setting a boundary at an arbitrary position in the exposed portion, and then dividing the front end side or the rear end side. The ratio is not particularly limited and is arbitrary. However, in view of strength and decorativeness, it is desirable that more than half of the exposed portion is a portion colored by the oxidative coloring process.
The term “oxidation coloring process” as used herein refers to a process for producing an interference color by increasing the thickness of an oxide film formed on a normal stainless steel surface to several tens to several hundreds. The film thickness is desirably 10 nm to 300 nm before the color treatment.
The ball-point pen tip 20 is made of stainless steel, and the surface thereof is subjected to oxidation coloring treatment to form a coloring layer 29. Therefore, in addition to the durability due to the stainless steel itself, the surface durability is enhanced by the oxidative coloring treatment and the aesthetics are improved. The ball-point pen tip 20 is preferably made of austenitic stainless steel such as SUS316 or SUS304 because it is easy to form the coloring layer 29 by the oxidation coloring process.
The shape of the ballpoint pen tip 20 is not particularly limited as long as the ballpoint pen tip 20 can be oxidized and colored.

  Further, in the ballpoint pen tip 20 according to the present invention, since the coloring according to the ink color is facilitated by the oxidation coloring process, the ballpoint pen tip is used particularly when the multi-color ink refill 10 is used like the multicolor ballpoint pen. It is also possible to determine the ink color by the 20 colored layers 29. Similarly, even when the ink refill 10 cannot be visually recognized with a single color ballpoint pen, the color of the ink can be discriminated by the colored layer 29 by the oxidative coloring process of the ballpoint pen chip 20. Further, since the oxidative coloring process can also provide a difference in density, it is also possible to provide an ink refill 10 that accommodates the ballpoint pen tip 20 in which different colors are developed even with the same color inks with different densities.

  The ball-point pen tip 20 in the ink refill 10 according to the present invention may be attached to the ink containing tube 40 via the joint 30 having the above shape.

  The ink refill 10 according to the present invention is attached to the writing instrument 70. Here, the writing instrument 70 may be either a single-color ballpoint pen or a multicolor ballpoint pen. A so-called compound writing instrument in which a monochromatic or multi-color ink refill 10 and a writing instrument unit other than a ballpoint pen, for example, a mechanical pencil unit, are accommodated in the same cylinder 71 is also included in the writing instrument 70 herein.

  By providing the above-described structure, according to the present invention, the ball-point pen tip that has been treated so as not to impair durability such as paint peeling due to friction with the fingers and the inner surface of the shaft cylinder while improving the beauty of the ball-point pen tip and It is possible to provide ink refills and writing instruments using this.

The external appearance of the tip member of the ink refill according to the embodiment of the present invention is shown in a front view (A) and a front sectional view (B). FIG. 2 is a front cross-sectional view showing a state immediately before the ink refill tip member according to the embodiment of the present invention is mounted on the ink storage tube. The modification of the tip member of the ink refill shown in FIG. 2 is shown with front sectional drawing. The modification of the tip member of the ink refill shown in FIG. 2 is shown with front sectional drawing. The ink refill which concerns on embodiment of this invention is shown with a front view (A) and front sectional drawing (B). The writing instrument which concerns on embodiment of this invention is shown with right side sectional drawing (A) and front sectional drawing (B, C).

Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the tip member of the ink refill 10 according to the embodiment of the present invention includes a joint 30, a ball-point pen tip 20 (see FIG. 1B) attached to the tip, and a ball-point pen tip 20. Composed.

  A joint 30 formed by injection molding made of polybutylene terephthalate (PBT resin) includes a main body 31 (FIGS. 1A and 1B) positioned substantially in the middle of the column and the main body 31. The tip portion 32 (FIGS. 1A and 1B) whose outer periphery is formed with a small diameter is located on the tip side of the tip, and the tip portion 32 is located closer to the tip side than the tip portion 32 and is tapered and tapered. A diameter portion 37 (FIGS. 1A and 1B) and a rear end portion 33 (FIGS. 1A and 1B) located on the rear end side of the main body portion 31 and having a small outer periphery. ).

The ballpoint pen tip 20 includes a substantially cylindrical holder 21 made of stainless steel, and a writing ball 28 made of cemented carbide held by the tip of the holder 21. The front end side of the outer periphery of the holder 21 is formed as a tapered tapered portion 22. The internal space on the tip end side of the tapered portion 22 is formed as a ball house 23 into which the writing ball 28 is inserted. On the other hand, an internal space from the rear end of the holder 21 to the vicinity of the ball house 23 is formed as a back hole 24. Further, an ink guide hole 25 connecting the ball house 23 and the back hole 24 and a channel groove 26 formed radially around the ink guide hole 25 are also formed in the holder 21. The leading edge of the tapered portion 22 is formed as a crimped portion 27 that is reduced inwardly, thereby preventing the writing ball 28 inserted into the ball house 23 from falling off.
The rear end portion of the ballpoint pen tip 20 is press-fitted into the inside of the tip end portion 32 of the joint 30, and accordingly, the tip end portion is a portion exposed from the tip end of the joint 30.

The surface of the ball-point pen tip 20 is subjected to an oxidation coloring process corresponding to the color of the ink 41 to be used, and a coloring layer 29 is formed. As a result, the tip portion including the tapered portion 22 and the coloring layer 29 of the ball-point pen tip 20 are exposed from the tip of the joint 30 (FIG. 1A).
The coloring layer 29 is preferably subjected to an oxidation coloring process before the holder 21 is cut or plastically processed. Further, when forming the coloring layer 29 after cutting, plastic working or the like, the coloring layer 29 can be formed by laser marking.
In addition, the coloring layer 29 may include the tapered portion 22, or the coloring layer 29 may be formed only on the tapered portion 22. Further, the coloring layer 29 may be formed on the entire surface of the holder 21, or when the writing ball 28 is made of stainless steel, the coloring layer 29 may be formed on the entire ballpoint pen tip 20 including the surface of the writing ball 28. Good.

  Further, as shown in FIG. 2, a spring 60 having a rod-like portion 61 on the front end side and a coil portion 62 on the rear end side is inserted from the rear end of the joint 30. The tip of the rod-like portion 61 is in contact with the rear end of the writing ball 28. The rear end of the spring 60 is locked by a locking protrusion 34 that protrudes inward by punching the rear end 33 of the joint 30 from the outer periphery. The spring 60 is provided for the purpose of preventing the ink 41 from leaking from the tip when the writing tool 70 is not used by constantly urging the writing ball 28 toward the tip.

  The rear end of the spring 60 may be locked by a locking member 35 inserted from the rear end of the joint 30 after the spring 60 is inserted, as shown in the modification of FIG.

  Further, as shown in the modification of FIG. 4, the rear end crimping portion 36 is formed by caulking the rear end of the joint 30 inward after the spring 60 is inserted, thereby locking the rear end of the spring 60. It is good to do.

  The rear end portion 33 of the joint 30 shown in FIG. 2 is press-fitted into the tip of the ink storage tube 40 as shown in FIG. The ink containing tube 40 is filled with ink 41 having a color corresponding to the color of the surface of the ballpoint pen tip 20. Further, a grease-like follower 42 is also filled for the purpose of preventing leakage of ink 41 and drying (FIG. 5B).

The ink refill 10 shown in FIG. 5 is attached to the dual writing instrument 70 shown in FIG. That is, three ink refills 10 (FIGS. 6B and 6C) are accommodated in the shaft cylinder 71 constituting the outer shape of the dual writing instrument 70. Two of the three ink refills 10 are connected to the ball-point pen knock mechanism 73 (FIG. 6B). The remaining one is connected to a ballpoint pen knock mechanism 74 with a clip (FIG. 6A). A clip 75 is attached to the ball-point pen knock mechanism 74 with a clip (FIG. 6A). It is desirable that the number of ink refills accommodated in the compound writing instrument 70 is two or more.
In the dual writing instrument 70 according to the present embodiment, none of the writing tips protrudes from the tip of the shaft cylinder 71 in the state shown in FIG. In this state, when one of the ballpoint pen knock mechanisms 73 is pressed in the distal direction, the corresponding ballpoint pen refill ballpoint tip 20 protrudes from the distal end of the shaft cylinder 71 as shown in FIG. . At this time, the user can recognize the color of the ink 41 in use by the color of the colored layer 29 formed on the ballpoint pen tip 20 protruding from the tip of the shaft cylinder 71.

  The present invention can be used for ink refilling of a ballpoint pen. In particular, it is suitable for a compound writing instrument that is assumed to use a plurality of inks of two or more colors.

10 Increfill
20 Ballpoint pen tip 21 Holder 22 Taper
23 Ball house 24 Back hole 25 Ink guide hole
26 Channel groove 27 Caulking section 28 Writing ball
29 Coloring layer
30 Fitting 31 Body 32 Tip
33 Rear end 34 Locking protrusion 35 Locking member
36 Rear end caulking part 37 Reduced diameter part
40 Ink receiving tube 41 Ink 42 Follower
60 Spring 61 Rod-shaped part 62 Coil part
70 Writing instruments (double-type writing instruments) 71 Shaft cylinder
73 Ballpoint pen knock mechanism 74 Ballpoint pen knock mechanism with clip 75 clips

Claims (1)

An ink containing tube for containing ink;
A ballpoint pen tip attached to the tip of the ink containing tube;
A writing instrument equipped with an ink refill comprising
The surface of the ballpoint pen tip is subjected to oxidation color treatment,
While having a joint interposed between the ink containing tube and the ballpoint pen tip,
The joint includes a cylindrical main body portion, a front end portion of the main body portion whose outer periphery is formed with a smaller diameter than the main body portion, and a rear end side of the main body portion whose outer periphery is the main body portion. And a rear end portion formed with a smaller diameter than the portion,
The rear end portion is press-fitted into the front end of the ink storage tube,
A rear end portion of the ballpoint pen tip is press-fitted into the tip portion,
From the rear end portion, the front end side is a rod-shaped portion, and the spring whose rear end side is a coil portion is inserted,
The color development layer of the ballpoint pen tip that has been subjected to the oxidation coloration process projects from the tip portion of the joint and develops a color difference that varies depending on the same color ink having different shades. A writing instrument with a refill.

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