JP3267083B2 - Writing implement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing implement comprising a writing implement main body having a pen tip holding member having a pen tip fixed to the tip at the tip of a barrel, and a cap for covering the pen tip in an airtight manner.

[0002]

2. Description of the Related Art Conventionally, a cap for covering a pen tip in an airtight manner has been almost indispensable for a writing instrument using ink to prevent drying and leakage of the ink. In order to cover the pen tip in an airtight manner, it is usually achieved by forming the contact portion between the writing instrument main body and the cap as an airtight contact portion. There are known ones in which a member is installed in a cap and a pen tip is directly in contact with the elastic member, and a member in which a circumferential contact portion with a cap is formed in a barrel or a pen tip holding member or the like. ing.

[0003]

The distance between the airtight contact portion between the writing instrument body and the cap with the cap attached, and the distance between the pen tip and the fitting portion between the cap and the barrel are strictly controlled. I had to. If these distances vary, the pen tip communicates with the outside air even when the cap is attached, and writing becomes impossible due to drying of the pen tip, and ink leaks due to blurring of the handwriting and pressure change occur, resulting in serious quality as a writing instrument. There was a problem of spoiling.

[0004]

That is, the present invention provides a writing instrument body having a pen tip holding member having a pen tip fixedly attached to the tip at the tip of a barrel, and a cap for covering the pen tip in an airtight manner. In the writing implement, by performing a circumferential caulking process on a metal barrel, a circumferential recess is formed on the barrel outer wall, and a circumferential inward protrusion is formed on the corresponding barrel inner wall, The writing implement is characterized in that the inwardly projecting portion is a mounting portion for a pen tip holding member made of synthetic resin, and the recess is a fitting recess for a fitting projection formed on a cap.

[0005]

According to the writing implement of the present invention, a metal barrel is subjected to caulking, so that the mounting portion of the nib holding member to the barrel and the fitting portion of the cap and the barrel can be substantially processed in one process. Since it can be formed at the same position, the distance between the airtight contact portion between the cap and the writing instrument main body, the distance between the pen tip and the cap fitting portion can be easily set without any variation, and in a state where the cap is attached. The pen tip can be reliably air-tightly covered, and quality defects such as inability to write, faint handwriting and ink leakage can be suppressed as much as possible.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 shows a first embodiment of a writing instrument A of the present invention, which is shown as a refill body of a writing instrument to be accommodated in an exterior body (not shown). The writing implement A is composed of a writing implement main body 1 and a cap 2. The cap 2 may be removed when it is housed in the exterior body, or may function as a cap even when housed in the exterior body. Or another outer cap (not shown) connected to the outer body.

This embodiment is an example of a so-called raw ink type writing instrument that stores ink in a free state inside. The writing instrument main body 1 includes a shaft cylinder 3 which is a bottomed cylinder obtained by subjecting a brass material to nickel electroless plating, and a pen tip holding member 5 having a pen tip 4 fixed to the tip. The shaft cylinder 3 is formed with an inner protruding portion 2a of the cap 2 on the outer wall of the shaft cylinder by circumferential caulking.
A peripheral concave portion is formed as a fitting concave portion 6 with the peripheral portion, and a peripheral inward protruding portion as a mounting portion 7 for the pen tip holding member 5 is formed on a corresponding inner wall of the shaft cylinder.

The fitting concave portion 6 and the mounting portion 7 of the barrel 3 are formed by caulking the outer wall of the barrel 3. The crimping press roll (not shown) is made of metal, It is made of synthetic resin, synthetic rubber, or the like, and is formed by pressing against the outer wall of the shaft cylinder while rotating the pressure roller. On this occasion,
The press-contact roll for forming the circumferential protrusion 9 is also attached to the caulking machine, and the circumferential protrusion 9 can be easily formed by forming the fitting recess 6 and the mounting portion 7 and the circumferential protrusion 9 in the same manner. The position can be controlled, and the processing efficiency is improved, which is preferable.

The pen tip holding member 5 is made of polyethylene resin,
It is made of a synthetic resin such as a polypropylene resin, a polyamide resin, a polyoxymethylene resin, an AS resin, an ABS resin, and a PET resin.
And a temporary ink reservoir 5b, which is a rear portion and has a comb-like longitudinal section.
Consists of A ballpoint pen tip made of a metal such as stainless steel, brass, brass or the like as a nib 4 is press-fitted and fixed to the tip of the inner hole 5c which is an ink passage. The temporary ink reservoir 5b divides the inside of the barrel 3 into an ink tank and exchanges ink and air when supplying the ink in the ink tank to the pen tip. A ring 8 made of synthetic rubber is attached to a rear portion of the temporary ink reservoir 5b, and is in liquid-tight contact with a circumferential projection 9 formed in the bore of the barrel.
Here, in order to facilitate the insertion of the pen tip holding member 5 into the barrel 3, the diameter formed by the tip of the circumferential projection 9 is smaller than the diameter formed by the tip of the mounting portion 7. ing.

A recess 5d is formed in the holding portion 5a of the pen tip holding member 5 as a fitting portion to the mounting portion 7 of the barrel 1. The concave portion 5d may be formed circumferentially or partially in a plurality. However, when the concave portion 5d is formed circumferentially, the concave portion 5d is formed in the slit 5e and the holding portion 5a, which are the air circulation portions of the temporary ink reservoir 5b. The formed air passage groove 5f
It is necessary that the air flow is not hindered by the mounting portion 7 of the shaft cylinder 1.

Further, the inner hole 5c of the pen tip holding member 5 communicates with the inner hole of the pen tip 4 as an ink passage and extends to the ink tank. Polyethylene, polypropylene, or the like that guides the ink in the ink tank to the pen tip 4 through the inner hole 5c.
An ink guide core 10 made of a convergent body of synthetic fibers such as polyester, polyvinyl chloride, polyamide or the like or natural fibers such as animal hair is inserted and fixed. The front end of the ink guide core 10 is inserted into a ballpoint pen tip and the rear end thereof. Has reached the inside of the ink tank. The fixing of the ink guide core 10 may be performed by welding or bonding depending on the material of the pen tip holding member 5 in addition to press-fitting fixing.

An inner hole of the cap 2 has a fitting recess 6 of a shaft cylinder.
And a circumferential contact protruding portion 2b for airtightly contacting an inward protruding portion 2a for fitting and a caulking inclined portion at the tip of the barrel. When the writing tool main body 1 and the cap 2 are fitted together to prevent the ink inside the writing tool main body 1 from drying, the air passage groove 5f formed in the pen tip holding portion 5 is opened by the opening of the shaft cylinder 3. The opening is formed in the space inside the cap which is airtight together with the pen tip 4 by utilizing the portion.

As described above, since the fitting concave portion 6 and the mounting portion 7 and the circumferential projection 9 are formed by a single caulking process, the mounting position of the cap 2 with respect to the writing instrument body 1 and the holding of the pen tip with respect to the barrel 3 are performed. The mounting position of the part 5 is determined without variation, and the airtightness of the space inside the cap when the cap is mounted becomes more reliable.

FIG. 2 shows another example. The basic structure is the same as that of the above-described example, but the method of maintaining the airtightness of the space in the cap is different. An elastic material 11 such as silicon rubber, butyl rubber, ethylene propylene rubber, polyethylene, or polypropylene is installed in the inner hole of the cap 2, and when the cap 2 is attached, the pen tip 4 comes into contact with the elastic material 11 so that the pen tip is hermetically sealed. What to do. Similarly to the above-described example, a circumferential projection 9 is formed in the inner hole of the cap 2 in an airtight contact with the pen tip holding member 5. The groove 5 f for the air passage is formed in the opening of the shaft cylinder 3. Nib holding part 5 without using the part
5g is formed in the airtight space in the cap as an air hole 5g.

In this embodiment, instead of using the barrel 3 as a bottomed cylinder as in the above-described example, a metal pipe material cut to an appropriate length is used. A tail plug 12 made of synthetic resin is fitted to the rear end opening. There is a certain limit to the total length of the cylindrical body for metal processing of a bottomed cylindrical body, but by using a pipe body, a long writing tool can be obtained and a large amount of built-in ink can be made. be able to.

FIG. 3 is different from the above-mentioned two examples in that ink is absorbed in a batting 13 made of a fiber converging body and stored in a shaft cylinder 3 having a bottomed cylindrical body. In a so-called batting-type writing instrument such as this example, it is necessary to pay attention to the pressure state in the batting accompanying ink consumption. In other words, batting 13
If the air is not supplied to the rear portion 13a due to the ink consumption, the air is supplied to the pen tip side portion of the batting with the ink consumption, and it becomes difficult for the ink existing in the rear portion 13a to be supplied to the pen tip. In this example, the batting 1 is
Projections 14 so as to form a space between the shaft 3 and the bottom 3a of the barrel.
Is formed, the ink supplied with the ink consumption can be reliably supplied to the rear portion 13a of the batting. In addition, the positional relationship between the batting 13 and the pen tip holding portion 5 is also ensured by the projections 14, and the positional relationship among the cap 2, the pen tip 4, the pen tip holding portion 5, the ink guide core 10, and the batting 13 is ensured. And the ink can be reliably supplied to the pen tip 4.

In addition to the above, various modifications can be made without departing from the gist of the present invention. As an example, in all of the above examples, the pen tip 4 is shown as a ball pen, but in addition, a fiber converging tip such as felt, a communicating porous tip such as urethane, a brush, a ceramic or metal For example, a small tube pen tip using a thin rod, a synthetic resin extruded product pen tip having an ink through hole, or the like may be used. The ink contained therein can be used irrespective of oiliness, water, pigment, and dye. However, in consideration of the ink holding ability, etc., it has a temporary ink reservoir structure as shown in FIGS. It is preferable to use an aqueous ink for the ink.

[0018]

According to the present invention, there is provided a writing implement comprising a writing implement main body having a pen tip holding member having a tip attached to the tip attached to the tip of a barrel and a cap for covering the pen tip in an airtight manner. By performing a circumferential caulking process on the metal barrel, a circumferential recess is formed on the barrel outer wall, and a circumferential inward protrusion is formed on the corresponding barrel inner wall,
The inward projecting portion is a mounting portion for a pen tip holding member made of a synthetic resin, and the concave portion is a fitting concave portion for a fitting projecting portion formed in the cap, so that the writing implement body and the cap with the cap attached are provided. There is no variation in the distance between the airtight contact part, the pen tip, and the fitting part of the cap and the barrel, so that writing is impossible due to drying of the pen tip and ink leakage due to blurring of handwriting and pressure change. It is possible to minimize the occurrence of such factors.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example.

FIG. 2 is a cross-sectional view showing another example.

FIG. 3 is a sectional view showing still another example.

[Explanation of symbols]

 A Writing implement 1 Writing implement main body 2 Cap 2a Inward projection 3 Shaft barrel 4 Pen tip 5 Pen tip holding member 5a Holding section 5b Temporary ink reservoir 5c Inner hole 5d recess 5e Slit 5f Groove 5g Air hole 6 Fitting recess 7 Mounting Part 8 Ring 9 Circular protrusion 10 Ink guide core 11 Elastic material 12 Tail plug 13 Filling 13a Rear part

Claims (1)

(57) [Claims] 1. A writing instrument comprising a writing instrument body having a pen tip holding member having a tip attached to the tip attached to the tip of a barrel, and a cap for covering the tip in an airtight manner.
By applying a circumferential caulking process to a metal barrel,
A circumferential concave portion is formed in the outer wall of the barrel, and a circumferential inward projection is formed in the inner wall of the corresponding barrel, and the inward projection is a mounting portion for a pen tip holding member made of synthetic resin, A writing instrument, wherein the recess is a fitting recess for a fitting projection formed on the cap.